DRIVING DEVICE AND ELECTRIC CURTAIN

Abstract

The present application provides a driving device including: a driven wheel configured to connect a pulling rope; a driving mechanism configured to drive the driven wheel to rotate; wherein the driving mechanism includes a driving motor, an output shaft, and a transmission assembly, the transmission assembly is connected between the driving motor and the output shaft, and the output shaft is connected to the driven wheel; when the output shaft is in a first state, the output shaft is coupled to the driven wheel and the transmission assembly respectively to form transmission connection; when the output shaft is in the second state, the output shaft is decoupled from the driven wheel and/or the transmission assembly to disconnect the transmission connection. The present application further provides an electric curtain having the driving device.

Claims

1. A driving device comprising: a driven wheel configured to connect a pulling rope; a driving mechanism configured to drive the driven wheel to rotate; wherein the driving mechanism comprises a driving motor, an output shaft, and a transmission assembly, the transmission assembly is connected between the driving motor and the output shaft, and the output shaft is connected to the driven wheel; the output shaft has preset first and second states, when the output shaft is in the first state, the output shaft is coupled to the driven wheel and the transmission assembly respectively, so that the output shaft is connected to the driven wheel and the transmission assembly in a transmission way respectively; when the output shaft is in the second state, the output shaft is decoupled from the driven wheel and/or the transmission assembly, so that there is no transmission connection between the output shaft and the driven wheel and/or the transmission assembly.

2. The driving device according to claim 1, wherein the transmission assembly comprises an output gear, the output gear is connected to a drive shaft of the driving motor in a transmission way, and the output gear is sleeved on the output shaft; the output shaft is capable of moving to extend and contract along its axial direction relative to the output gear, so that the output shaft is coupled with or decoupled from the output gear; when the output shaft is coupled with the output gear, the output shaft is fixed to the output gear along its circumference, so that the output shaft can rotate along with the output gear; when the output shaft is decoupled from the output gear, the output shaft can rotate along its circumference relative to the output gear, so that the output shaft does not rotate along with the output gear.

3. The driving device according to claim 2, wherein the output shaft is provided with a first engagement structure, and the output gear is provided with a second engagement structure; when the output shaft moves to extend and retract relative to the output gear, the first engagement structure is capable of engaging with or disengaging from the second engagement structure to make the output shaft be coupled with or decoupled from the output gear; and/or the first engagement structure comprises one of a first flat shaft and a first flat hole that are adapted, and the second engagement structure comprises the other of the first flat shaft and the first flat hole that are adapted.

4. The driving device according to claim 2, wherein the transmission assembly further comprises a transmission gear and an intermediate gear, the drive shaft of the driving motor is provided with a motor gear, the motor gear meshes with the transmission gear, the transmission gear meshes with the intermediate gear, and the intermediate gear meshes with the output gear; and/or the transmission gear comprises a crown gear, and the intermediate gear comprises a flat gear.

5. The driving device according to claim 2, wherein the driven wheel is sleeved on the output shaft, and the output shaft is capable of moving to extend and contract relative to the driven wheel along its axial direction; when the output shaft moves to extend and retract relative to the driven wheel, the output shaft remains being coupled with the driven wheel; and/or the output shaft comprises a second flat shaft, and the driven wheel is provided with a second flat hole adapted to the second flat shaft; when the output shaft moves to extend and retract relative to the driven wheel, the second flat shaft remains being inserted in the second flat hole.

6. The driving device according to claim 2, wherein the driving mechanism further comprises a clutch member connected to the output shaft; operating the clutch member is capable of making the output shaft be in the first state or the second state; and/or the driving mechanism further comprises a first elastic member, the first elastic member is connected to the output shaft, and the first elastic member is configured to drive the output shaft to transit from the second state to the first state through elastic force; and/or the clutch member and the first elastic member are respectively arranged at two opposite ends of the output shaft; pressing the clutch member is capable of pushing the output shaft to move towards a side close to the first elastic member and making the output shaft to transit from the first state to the second state; the first elastic member is capable of storing force under squeezing action of the output shaft at the same time, so that the first elastic member drives the output shaft to transit from the second state to the first state through elastic force after losing the squeezing action of the output shaft; and/or the clutch member is rotatably connected to an end of the output shaft, and the output shaft is rotatable relative to the clutch member.

7. The driving device according to claim 2, wherein the driving mechanism further comprises a housing; a first end of the output shaft is located inside the housing, and a second end of the output shaft extends outside the housing; the output shaft is capable of telescopic movement and rotation relative to the housing; the transmission assembly is located inside the housing, and the transmission assembly is connected to the first end of the output shaft; both the driven wheel and the clutch assembly are located outside the housing, the clutch member is arranged at a distal end of the second end of the output shaft, the driven wheel is sleeved on the output shaft, and the driven wheel is located between the clutch member and an outer wall of the housing; and/or a sliding bearing is sleeved on the output shaft, and the output shaft is connected to the housing through the sliding bearing.

8. The driving device according to claim 1, wherein the transmission assembly comprises a first transmission wheel group and a second transmission wheel group, the driving motor is connected to the first transmission wheel group, the first transmission wheel group meshes with the second transmission wheel group, and the second transmission wheel group is connected to the output shaft; the driving device further comprises a housing and a clutch assembly, the first transmission wheel group and the second transmission wheel group are arranged inside the housing, the clutch assembly movably meshes with the second transmission wheel group, the driven wheel is connected to the output shaft, and the driven wheel is further configured to connect a pulling rope of a curtain body; wherein the second transmission wheel group is switched between preset first and second states in response to movement of the clutch assembly; in the second state, the second transmission wheel group rotates in response to rotation of the driven wheel, so as to realize that the driven wheel drives the curtain body to move under action of manually driving force coming from the pulling rope; in the first state, the second transmission wheel group drives the driven wheel in response to rotation of the first transmission wheel group, and thereby drives the curtain body to move.

9. The driving device according to claim 8, wherein the second transmission wheel group comprises a planetary wheel group, an annular gear, and a planet carrier, the planetary wheel group is located inside the annular gear and meshes with the annular gear and the first transmission wheel group, the clutch assembly is movably arranged between the annular gear and the housing, the planet carrier is connected to the first transmission wheel group and the planetary wheel group, and the output shaft is formed on the planet carrier; and/or the annular gear switches between the first state and the second state in response to movement of the clutch assembly; in the second state, the annular gear is rotatable relative to the housing, the driven wheel, the planetary carrier, the annular gear, and the planetary wheel group form a power system, the annular gear rotates in response to rotation of the planetary carrier, so as to realize that the driven wheel drives the curtain body to move under action of manually driving force coming from the pull rope; in the first state, the annular gear is fixed to the housing, the driving motor, the first transmission wheel group, the planetary wheel group, the planetary carrier, and the driven wheel form a power system, the planetary wheel group responds to rotation of the first transmission wheel group to drive the curtain body to move; and/or when an end of the clutch assembly abuts an outer wall of the annular gear and an inner wall of the housing, the annular gear is in the first state relative to the housing, and the driving motor is capable of driving the first transmission wheel group to move forward; when the end of the clutch assembly is separated from the outer wall of the annular gear, the annular gear is in the second state relative to the housing, and the first transmission wheel group is in a reverse motion locking state.

10. The driving device according to claim 8, wherein the driving device further comprises a second elastic member, a baffle plate protrudes from a side wall of the clutch assembly, the second elastic member abuts between opposite surfaces of the baffle plate and of the housing, and the second elastic member is configured to move towards the annular gear along a direction of movement of the clutch assembly; and/or an outer wall of the gear ring forms multiple recesses, the multiple recesses are evenly distributed along a circumferential direction of the gear ring, and the multiple recesses are concavely and convexly matched with an end of the clutch assembly.

11. The driving device according to claim 8, wherein the side wall of the clutch assembly is provided with a protruding shaft, the housing is provided with a first through groove extending along the direction of movement of the clutch assembly, and the protruding shaft penetrates the first through groove; and/or the driving device further comprises a clutch push block, one end of the clutch push block forms a sleeve, another end of the clutch push block forms an operating end for manual clutch, and the sleeve is sleeved on the protruding shaft; and/or the driving device further comprises an electric control assembly, the electric control assembly is provided with a first through hole and a second through groove, wherein the electronic control assembly is arranged at a side of the clutch push block away from the housing and covered on the housing, and the electronic control assembly is connected to the driving motor in communication and is provided with an electrical button on one side; the output shaft passes through the first through hole and extends to a side of the electronic control assembly away from the housing; the second through groove forms a clutch operation window and accommodates the operating end.

12. The driving device according to claim 8, wherein the first transmission wheel group comprises a worm wheel, a worm rod, a first gear, a second gear, and a sun gear, wherein the worm rod is connected to an output end of the driving motor and meshes with the worm wheel; the first gear is coaxially connected to the worm wheel and is rotatably mounted on the housing; the second gear is rotatably mounted on the housing and meshes with the first gear and a large annular gear of the sun gear; the sun gear is mounted on a first shaft end of the planet carrier, and a small annular gear of the sun gear meshes with the planetary gear group; and/or the planetary gear group comprises multiple planetary gears, the multiple planetary gears are rotatably mounted on second shaft ends of the planet carrier; the multiple planetary gears are evenly distributed in the annular gear and mesh with the annular gear respectively; the multiple planetary gears are arranged outside the small annular gear of the sun gear and mesh with the small annular gear of the sun gear respectively.

13. The driving device according to claim 8, wherein when the clutch assembly and the annular gear are in the first state, power of the driving motor is transmitted to the sun gear of the first transmission wheel group through the output end of the driving motor, the small annular gear of the sun gear drives the planetary gears to rotate, the planetary gears drive the output shaft of the planetary carrier to rotate, the output shaft of the planetary carrier drives the driven wheel to move, the driven wheel is used to drive the pulling rope to move; when the clutch assembly is moved so that the clutch assembly and the annular gear are in the second state, the driven wheel is used to drive the output shaft of the planetary carrier to rotate under drive of the pulling rope, the planetary carrier drives the planetary gears to rotate, and the planetary gears drive the annular gear to rotate; when the clutch assembly is driven to move along a direction away from the annular gear, an end of the clutch assembly separates from the outer wall of the annular gear, so that the clutch assembly and the annular gear are in the second state.

14. An electric curtain comprising: a pulling rope, a curtain body, and a driving device according to claim 1, wherein the pulling rope is wound around the driven wheel, and the pulling rope is connected to the curtain body; the pulling rope is a bead pulling rope.

15. The electric curtain according to claim 14, further comprising a curtain anti-drop device; wherein the curtain anti-drop device comprises: an anti-drop structure comprising a clamping arm; a power structure comprising a front housing, wherein the driven wheel is rotatably connected to the front housing, the driven wheel is configured to mesh with the pulling rope and further used to drive the pulling rope to rotate; wherein the clamping arm is rotatably connected to the front housing, and the clamping arm is configured to press the pulling rope against the driven wheel.

16. The electric curtain according to claim 15, wherein the number of clamping arm is at least two, and the at least two clamping arms are arranged on opposite sides of the driven wheel; or the number of clamping arm is one, and the clamping arm surrounds an outer side of the driven wheel; and/or the driven wheel defines multiple snap slots along a circumference thereof, the snap slots are configured to engage with the pull rope; and/or the clamping arm comprises a connection part and a clamping part that are connected to each other, the connection part is rotatably connected to the front housing, and the clamping part bends and extends towards a direction close to the driven wheel; and/or the clamping part is provided with a convex strip, the convex strip is arranged at a side of the clamping part near the driven wheel, and the convex strip is configured to press the pulling rope against the driven wheel; and/or the connection part is provided with a convex post, the convex post is arranged at a side of the connection part near the housing; the front housing is provided with a rotation groove, and the convex post is inserted in the rotation groove and rotatably cooperates with the rotation groove; and/or the rotation groove bends and extends on the front housing, and the convex post is inserted in the rotation groove and slidable in the rotation groove.

17. The electric curtain according to claim 16, wherein the anti-drop structure comprises a rotation element, the front housing is provided with a first mounting groove, and the rotation element extends into the first mounting groove and is connected to the front housing; the connection part is provided with a second mounting groove, and the connection part is sleeved on the outer circumference of the rotation element through the second mounting groove and rotatably cooperates with the rotation element; and/or the anti-drop structure further comprises a lock element, the lock element passes through the first mounting groove and is connected to the rotation element to fix the rotation element with the front housing; and/or the rotation element comprises a rod body and a limiting part, the rod body extends into the first mounting groove and is connected to the front housing, the connection part is sleeved on an outer circumference of the rod body through the second mounting groove and rotatably cooperates with the rod body, the limiting part is connected to the rod body in a circumferential direction, and the limiting part abuts the front housing; and/or an end of the rotation element extending out of the second mounting groove is provided with a limiting slot, and the anti-drop structure comprises a snap element, the snap element is inserted in the limiting slot and abuts the connection part; and/or the connection part is provided with a rolling sleeve, the rolling sleeve is sleeved on an outer circumference of the rotation element and located in the second mounting groove; and/or the anti-drop structure comprises a third elastic member, a side of the housing extends towards a direction away from the clamping arm to form a protruding part, the third elastic member has one end elastically connected to the clamping arm and another end wound around the protruding part, and the third elastic member is configured to push the clamping arm to rotate towards a direction close to the driven wheel; and/or when the clamping arm rotates towards a direction away from the driven wheel, the clamping arm pushes the third elastic member to move and makes the third elastic member generate elastic deformation, the third elastic member pushes the clamping arm to rotate towards the direction close to the driven wheel through elastic deformation.

18. The electric curtain according to claim 14, further comprising a tension adjusting device configured to tension the pulling rope, wherein the tension adjusting device comprises: an outer housing configured to fixed to a wall; a tension structure comprising a first wheel and a second wheel, wherein the first wheel is movably connected to the outer housing, the second wheel is connected to the outer housing, the first wheel and the second wheel are sequentially arranged along a length direction of the outer housing, and the first wheel and the second wheel are configured for winding the pulling rope; and a driving structure connected to the first wheel, wherein the driving structure is configured to drive the first wheel to move along a width direction of the outer housing.

19. The electric curtain according to claim 18, wherein the number of second wheel is multiple; along a length direction of the outer housing, the multiple second wheels are respectively arranged at both two sides of the first wheel; along a width direction of the outer housing, the multiple second wheels are arranged at the same side of the first wheel; and/or the length direction and the width direction define a first plane, a projection center of the first wheel on the first plane is a first center, projection centers of the multiple second wheels on the first plane are second centers, along the length direction, an included angle between connection lines from the first center to the second centers at two sides thereof is ; when the first wheel moves along the width direction of the outer housing, 160<<250; and/or a diameter of the first wheel is greater than a diameter of the second wheel; and/or an outer side of the first wheel recesses inward to form a first limiting slot, and/or an outer side of the second wheel recesses inward to form a second limiting slot; the first limiting slot and the second limiting slot are configured to limit the pulling rope; and/or the first wheel comprises a first limiting part and a first roller part, the first roller part is connected to the outer housing, the first limiting part is connected to the top of the first roller part, and a projection of the first limiting part on the first plane covers a projection of the first roller part on the first plane; and/or the second wheel comprises a second limiting part and a second roller part, the second limiting part is connected to the outer housing, the second limiting part is connected to the top of the second roller part, and a projection of the second limiting part on the first plane covers a projection of the second roller part on the first plane.

20. The electric curtain according to claim 18, wherein the tension structure further comprises a first fixing post and a second fixing post, the first fixing post is movably connected to the outer housing and is connected to the driving structure, the second fixing post is connected to the housing; the first wheel is sleeved on the first fixing post, and the second wheel is sleeved on the second fixing post; the first wheel rotatably cooperates with the first fixing post, and the second wheel rotatably cooperates with the second fixing post; and/or the tension structure comprises a first fixing member and a second fixing member, the first fixing member is connected to the first fixing post and located at the top of the first wheel, and the first fixing member is configured to axially limit the first wheel; the second fixing member is connected to the second fixing post and located at the top of the second wheel, and the second fixing member is configured to axially limit the second wheel.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to explain technical solutions of embodiments of the present application more clearly, drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and therefore should not be regarded as scope limitation. For those of ordinary skill in the art, other related drawings can be further obtained according to these drawings on the premise of paying no creative work.

[0029] FIG. 1 is a structural schematic view of a driving device provided by a preferred embodiment of the present application.

[0030] FIG. 2 is a structural schematic view of the driving device shown in FIG. 1 along another direction.

[0031] FIG. 3 is a disassembled structural schematic view of the driving device shown in FIG. 1.

[0032] FIG. 4 is a disassembled structural schematic view of a driving mechanism of the driving device shown in FIG. 1.

[0033] FIG. 5 is a disassembled structural schematic view of the driving mechanism shown in FIG. 4 further disassembled.

[0034] FIG. 6 is a structural schematic view of the driving mechanism shown in FIG. 5 along another direction.

[0035] FIG. 7 is a schematic view of cooperation relationship between an output shaft and an output gear in the driving mechanism.

[0036] FIG. 8 is a schematic view of cooperation relationship between the output shaft and a driven wheel in the driving mechanism.

[0037] FIG. 9 is a structural schematic view of the output shaft in the driving mechanism.

[0038] FIG. 10 is a structural schematic view of the output gear in the driving mechanism.

[0039] FIG. 11 is a structural schematic view of a clutch member of the driving device shown in FIG. 1.

[0040] FIG. 12a is a schematic view of cooperation relationship among the driving mechanism, the driven wheel, and the clutch member of the driving device shown in FIG. 1, wherein the output shaft is in a first state.

[0041] FIG. 12b is a schematic view of cooperation relationship among the driving mechanism, the driven wheel, and the clutch member of the driving device shown in FIG. 1, wherein the output shaft is in a second state.

[0042] FIG. 13 is a structural schematic view of an electric curtain provided by a preferred embodiment of the present application.

[0043] FIG. 14 is a structural schematic view of the electric curtain shown in FIG. 13 at another angle.

[0044] FIG. 15 is a disassembled schematic view of a driving device of the electric curtain shown in FIG. 13.

[0045] FIG. 16 is a disassembled schematic view of the driving device shown in FIG. 15 at another view angle.

[0046] FIG. 17 is a position schematic view of the driving device shown in FIG. 15 in the second state.

[0047] FIG. 18 is a position schematic view of the driving device shown in FIG. 15 in the second state, at another view angle.

[0048] FIG. 19 is a position schematic view of the driving device shown in FIG. 15 in the first state.

[0049] FIG. 20 is a position schematic view of the driving device shown in FIG. 15 in the first state, at another view angle.

[0050] FIG. 21 is a structural schematic view of an electric curtain provided by another preferred embodiment of the present application.

[0051] FIG. 22 is a structural schematic view of a curtain anti-drop device in the electric curtain shown in FIG. 21.

[0052] FIG. 23 is a structural schematic view of a power structure of the curtain anti-drop device shown in FIG. 22.

[0053] FIG. 24 is a disassembled schematic view of the curtain anti-drop device shown in FIG. 22.

[0054] FIG. 25 is a cut-away schematic view of the curtain anti-drop device shown in FIG. 22.

[0055] FIG. 26 is a schematic view of a bottom structure of the curtain anti-drop device shown in FIG. 22.

[0056] FIG. 27 is another disassembled schematic view of the curtain anti-drop device shown in FIG. 22.

[0057] FIG. 28 is another cut-away schematic view of the curtain anti-drop device shown in FIG. 22.

[0058] FIG. 29 is a structural schematic view of an electric curtain provided by another preferred embodiment of the present application.

[0059] FIG. 30 is a structural schematic view of an adjusting device of the electric curtain shown in FIG. 29.

[0060] FIG. 31 is a structural schematic view of the adjusting device shown in FIG. 30 at another view angle.

[0061] FIG. 32 is a cut-away schematic view of the adjusting device shown in FIG. 30.

[0062] FIG. 33 is a disassembled schematic view of the adjusting device shown in FIG. 30.

[0063] FIG. 34 is a structural schematic view of the adjusting device shown in FIG. 30 according to another embodiment.

[0064] Reference numbers in the drawings: 1driven wheel; 11second flat hole; 12first accommodation groove; 2pulling rope; 3driving mechanism; 31driving motor; 310driving shaft; 311motor gear; 32transmission assembly; 321output gear; 3211first flat hole; 3212circular hole; 322transmission gear; 323intermediate gear; 324first rotation shaft; 325second rotation shaft; 33output shaft; 331first flat shaft; 332second flat shaft; 333cylinder shaft; 334connection shaft; 3341first snap slot; 34first elastic member; 35housing; 351front housing; 352rear housing; 353second accommodation groove; 36sliding bearing; 37gasket; 381first screw bolt; 382second screw bolt; 4clutch member; 41flange; 5base; 51assembly groove; 10driving device; 130partition plate; 140cover plate; 141first through groove; 150first screw; 160second screw; 170first bearing; 180second bearing; 190third bearing; 200transmission wheel assembly; 210first transmission wheel group; 211worm wheel; 212worm rod; 213first gear; 214second gear; 215sun gear; 2151large annular gear; 2152small annular gear; 216third rotation shaft; 217fourth rotation shaft; 202second transmission wheel group; 220planetary wheel group; 221planetary gear; 230annular gear; 231recess; 240planetary carrier; 242first shaft end; 243second shaft end; 300clutch assembly; 500baffle plate; 600second elastic member; 700protruding shaft; 800clutch push block; 810sleeve; 820operation end; 900electrical control assembly; 910first through hole; 920second through groove; 930electrical button; 1Aanti-drop structure; 2Apower structure; 11Aclamping arm; 12Athird elastic member; 13Arotation element; 14Asnap element; 15Alock element; 111Aconnection part; 112Aclamping part; 113Aconvex post; 114Aconvex strip; 115Asecond mounting groove; 116Arolling sleeve; 131Arod body; 132Alimiting slot; 133Alimiting part; 211Afirst mounting groove; 212Aprotruding part; 213Arotation groove; 221Asecond snap slot; 1Badjusting device; 3Bpower member; 11Bouter housing; 12Btension structure; 13Bdriving structure; 111Bfirst housing; 112Bsecond housing; 113Bmoving slot; 121Bfirst wheel; 122Bsecond wheel; 123Bfirst fixing post; 124Bsecond fixing post; 125Bfirst fixing member; 126Bsecond fixing member; 127Bshim; 131Brotation member; 132Boperation member; 133Blimiting member; 1211Bfirst limiting part; 1212Bfirst roller part; 1213Bfirst limiting slot; 1221Bsecond limiting part; 1222Bsecond roller part; 1223Bsecond limiting slot; 1321Banti-slipping part.

DETAILED DESCRIPTION

[0065] Specific embodiments of the present application will be described in detail below in combination with the accompany drawings. Obviously, the described embodiments are merely some embodiments of the present application, rather than all embodiments. Based on the description of the present application, all of other embodiments obtained by one of ordinary skill in the art on the premise of paying no creative work belong to the protection scope of the present application.

[0066] As shown in FIG. 1 to FIG. 6, FIG. 12a, and FIG. 12b, a preferred embodiment of the present application provides a driving device suitable for an electric curtain, such as an electric window curtain. The driving device includes: a driven wheel 1 configured to connect a pulling rope 2, wherein the driven wheel 1 can move synchronously with the pulling rope 2, and the type of the pulling rope 2 is As an implementation a bead pulling rope; a driving mechanism 3 configured to drive the driven wheel 1 to rotate, wherein the driving mechanism 3 includes a driving motor 31, an output shaft 33, and a transmission assembly 32, the transmission assembly 32 is connected between the driving motor 31 and the output shaft 33, and the output shaft 33 is connected to the driven wheel 1. The output shaft 33 has a first state (i.e., a coupled state) and a second state (i.e., a decoupled state), and can switch between the two states; when the output shaft 33 is in the first state, the output shaft 33 is coupled to the driven wheel 1 and the transmission assembly 32 respectively, so that the output shaft 33 is connected to the driven wheel 1 and the transmission component 32 in a transmission way respectively; when the output shaft 33 is in the second state, the output shaft 33 is decoupled from the driven wheel 1 and/or the transmission assembly 32, so that there is no transmission between the output shaft 33 and the driven wheel 1 and/or the transmission assembly 32; and a clutch member 4 connected to the output shaft 33, wherein operating the clutch member 4 can make the output shaft 33 be in the first state or the second state. Specifically, in this embodiment, by operating the clutch member 4, the output shaft 33 can be transited from the first state to the second state; of course, in other embodiments, it is also possible to operate the clutch member 4 to make the output shaft 33 to transit from the second state to the first state; alternatively, by operating the clutch member 4, it is possible to make the output shaft 33 to be switched between the first state and the second state.

[0067] Specifically, in the driving device provided by this embodiment of the present application, since the output shaft 33 has the first state and the second state, when the output shaft 33 is in the first state, the output shaft 33 is coupled with the driven wheel 1 and the transmission assembly 32 respectively, that is, the output shaft 33 is connected to the driven wheel 1 and the transmission assembly 32 in a transmission way respectively; at this time, the driving motor 31 can drive the driven wheel 1 to rotate through the transmission assembly 32 and the output shaft 33, thereby driving the pulling rope 2 to move and realizing the function of driving the curtain by the motor; when the clutch member 4 is operated so as to make the output shaft 33 to transit from the first state to the second state, the output shaft 33 is decoupled from the driven wheel 1 and/or the transmission assembly 32, that is, there is no transmission between the output shaft 33 and the driven wheel 1 and/or the transmission assembly 32; when the pulling rope 2 is manually pulled to move, the driven wheel 1 will rotate along with the pulling rope 2, but the transmission assembly 32 and the driving motor 31 will not move synchronously (in the second state, when the output shaft 33 is decoupled from the driven wheel 1, the output shaft 33 will not move synchronously along with the driven wheel 1; when the the output shaft 33 is not decoupled from the driven wheel 1, the output shaft 33 will move synchronously along with the driven wheel 1), that is, the clutch function of the driving device is realized; at this time, the pulling rope 2 can be easily pulled, and damage of the driving mechanism 3 will not be caused. This driving device can realize free switching between driving a curtain by a motor and manually driving a curtain, and does not need to drive the driving motor 31 and the transmission assembly 32 to move synchronously when manually driving the curtain; not only can manually driving the curtain be easily realized, thereby saving time and work, but also damage of the driving mechanism 3 can be avoided.

[0068] As an implementation, when the output shaft 33 is in the second state, the output shaft 33 is decoupled from the transmission assembly 32, while the output shaft 33 is still coupled with the driven wheel 1. That is, at this time, there is no transmission between the output shaft 33 and the transmission assembly 32, but the output shaft 33 is still connected to the driven wheel 1 in a transmission way. Of course, in other embodiments, when the output shaft 33 is in the second state, it is also possible that the output shaft 33 is decoupled from the driven wheel 1 while the output shaft 33 keeps being coupled with the transmission assembly 32. At this time, there is no transmission between the output shaft 33 and the driven wheel 1, but the output shaft 33 and the transmission assembly 32 still maintain a transmission connection; alternatively, the output shaft 33 is decoupled from both the transmission assembly 32 and the driven wheel 1, at this time, there is no transmission between the output shaft 33 and the transmission assembly 32, as well as between the output shaft 33 and the driven wheel 1.

[0069] As shown in FIG. 4 to FIG. 6, FIG. 12a, and FIG. 12b, as an implementation, the transmission assembly includes an output gear 321, the output gear 321 is connected to a drive shaft 310 of the driving motor 31 in a transmission way, and the output gear 321 is sleeved on the output shaft 33. The output shaft 33 is capable of moving to extend and contract along its axial direction relative to the output gear 321, so that the output shaft 33 is coupled with or decoupled from the output gear 321 (as shown in FIG. 12a, the output shaft 33 and the output gear 321 are in the first state; as shown in FIG. 12b, the output shaft 33 and the output gear 321 are in the second state). That is, when the output shaft 33 is in the first state, the output shaft 33 is coupled with the output gear 321; when the output shaft 33 is in the second state, the output shaft 33 is decoupled from the output gear 321.

[0070] Among them, when the output shaft 33 is coupled with the output gear 321, the output shaft 33 is fixed to the output gear 321 along its circumference, so that the output shaft 33 can rotate along with the output gear 321, that is, the driving motor 31 can drive the driven wheel 1 to rotate through the output gear 321 and the output shaft 33 at this time. When the output shaft 33 is decoupled from the output gear 321, the output shaft 33 can rotate along its circumference relative to the output gear 321 (that is, the output shaft 33 idles along its circumference relative to the output gear 321), so that the output shaft 33 does not rotate along with the output gear 321, that is, when the pulling rope 2 is manually pulled to move at this time, the output shaft 33 rotates along with the driven wheel 1, while the output gear 321 and the driving motor 31 do not move synchronously along with the output shaft 33.

[0071] As shown in FIG. 5 to FIG. 7, FIG. 9, FIG. 10, FIG. 12a, and FIG. 12b, as an implementation, the output shaft 33 is provided with a first engagement structure (not labeled in the drawings), and the output gear 321 is provided with a second engagement structure (not labeled in the drawings). When the output shaft 33 moves to extend and retract relative to the output gear 321 along its axial direction, the first engagement structure is capable of engaging with or disengaging from the second engagement structure to make the output shaft 33 be coupled with or decoupled from the output gear 321. That is, when the first engagement structure engages with the second engagement structure, the output shaft 33 is coupled with the output gear 321; when the first engagement structure disengages from the second engagement structure, the output shaft 33 is decoupled from the output gear 321.

[0072] Specifically, in this embodiment, the first engagement structure includes a first flat shaft 331, and the second engagement structure includes a first flat hole 3211 adapted to the first flat shaft 331. When the output shaft 33 moves to extend and retract relative to the output gear 321 along its axial direction, as shown in FIG. 12a, when the first flat shaft 331 is located in the first flat hole 3211, the output shaft 33 is fixed with the output gear 321 along its circumferential direction, that is, the output shaft 33 is coupled with the output gear 321 at this time; as shown in FIG. 12b, when the first flat shaft 331 disengages from the first flat hole 3211, the two lose their engagement function; at this time, the output shaft 33 can rotate relative to the output gear 321 along its circumferential direction, that is, the output shaft 33 is decoupled from the output gear 321. In this embodiment, the first flat shaft 331 is a double flat shaft, and the first flat hole 3211 is a double flat hole adapted to the double flat shaft; of course, in other embodiments, the first flat shaft 331 can also be a single flat shaft, and the first flat hole 3211 can also be a single flat hole.

[0073] As shown in FIG. 5 to FIG. 7, FIG. 9, FIG. 10, FIG. 12a, and FIG. 12b, as an implementation, the output shaft 33 further includes a cylindrical shaft 333 connected to the first flat shaft 331, and the output gear 321 is provided with a circular hole 3212 adapted to the cylindrical shaft 333, the circular hole 3212 is in communication with the first flat hole 3211. When the output shaft 33 moves to extend and retract relative to the output gear 321 along its axial direction, the cylindrical shaft 333 always remains being inserted in the circular hole 3212, so that the output gear 321 can always be sleeved on the output shaft 33 to maintain the support effect of the output shaft 33 to the output gear 321 and prevent the position of the output gear 321 from shifting.

[0074] As shown in FIG. 4 and FIG. 6, as an implementation, the transmission assembly 32 further includes a transmission gear 322 and an intermediate gear 323, the drive shaft 310 of the driving motor 31 is provided with a motor gear 311, the motor gear 311 meshes with the transmission gear 322, the transmission gear 322 meshes with the intermediate gear 323, and the intermediate gear 323 meshes with the output gear 321. In this way, power of the driving motor 31 can be transmitted to the output shaft 33 through the motor gear 311, the transmission gear 322, the intermediate gear 323,, and the output gear 321 sequentially, thereby driving the driven wheel 1 to rotate and driving the pulling rope 2 to move.

[0075] Specifically, in this embodiment, the intermediate gear 323 includes a flat gear, and the transmission gear 322 includes a crown gear. Advantages of using crown gear transmission include: a crown gear can achieve 90 degree adjustment of a gear transmission direction like worm rod transmission, and has higher transmission efficiency and energy saving than worm rod transmission.

[0076] As shown in FIG. 8, FIG. 12a, and FIG. 12b, as an implementation, the driven wheel 1 is sleeved on the output shaft 33, and the output shaft 33 is capable of moving to extend and contract relative to the driven wheel 1 along its axial direction. When the output shaft 33 moves to extend and retract relative to the driven wheel 1, the output shaft 33 remains being coupled with the driven wheel 1; that is, when the output shaft 33 is in each of the first state and the second state, the output shaft 33 is coupled with the driven wheel 1, thus the output shaft 33 can remain rotating along with the driven wheel 1.

[0077] Specifically, in this embodiment, the output shaft 33 further includes a second flat shaft 332, the second flat shaft 332 is connected to the cylindrical shaft 333, and the second flat shaft 332 is located at a side of the cylindrical shaft 333 away from the first flat shaft 331; the driven wheel 1 is provided with a second flat hole 11 adapted to the second flat shaft 332. When the output shaft 33 moves to extend and retract relative to the driven wheel 1, the second flat shaft 332 remains being inserted in the second flat hole 11; that is, when the output shaft 33 is in each of the first state and the second state, the second flat shaft 332 is inserted in the second flat hole 11, so that the output shaft 33 remains being fixed with the driven wheel 1 along its circumferential direction. In this embodiment, the second flat shaft 332 is a single flat shaft, and the second flat hole 11 is a single flat hole; of course, in other embodiments, the second flat shaft 332 can also be a double flat shaft, and the second flat hole 11 can also be a double flat hole.

[0078] As shown in FIG. 4 to FIG. 6, FIG. 12a, and FIG. 12b, as an implementation, the driving mechanism 3 further includes a first elastic member 34, the first elastic member 34 is connected to the output shaft 33, and the first elastic member 34 is configured to drive the output shaft 33 to transit from the second state to the first state through elastic force, so as to enable the output shaft 33 to automatically reset. Of course, in other embodiments, it is also to provide no first elastic member 34 and manually reset the output shaft 33 after use is completed.

[0079] As shown in FIG. 4 to FIG. 6, FIG. 12a, and FIG. 12b, as an implementation, the clutch member 4 and the first elastic member 34 are respectively arranged at two opposite ends of the output shaft 33; pressing the clutch member 4 is capable of pushing the output shaft 33 to move towards a side close to the first elastic member 34 and making the output shaft 33 to transit from the first state to the second state; at the same time, the first elastic member 34 is capable of storing force under squeezing action of the output shaft 33, so that the first elastic member 34 drives the output shaft 33 to transit from the second state to the first state through elastic force after losing the squeezing action of the output shaft 33.

[0080] Specifically, in this embodiment, the first elastic member 34 is a spring, and the first elastic member 34 abuts an end of the output shaft 33. As shown in FIG. 12b, after manually pressing the clutch member 4, the clutch member 4 pushes the output shaft 33 to move towards a side close to the first elastic member 34; at this time, the output shaft 33 is decoupled from the output gear 321, and the first elastic member 34 is compressed and stores force under the squeezing action of the output shaft 33; as shown in FIG. 12a, when the clutch member 4 is released (i.e., the clutch member 4 is no longer manually pressed), the output shaft 33 loses the pushing effect of the clutch member 4, thus the first elastic member 34 also loses the squeezing effect of the output shaft 33; at this time, the output shaft 33 moves back towards the side close to the clutch assembly 4 under the elastic force of the first elastic member 34, so that the output shaft 33 is coupled with the output gear 321 again. Of course, in other embodiments, the clutch member 4 and the first elastic member 34 can also be arranged in other positions, and the clutch member 4 can also drive the output shaft 33 to move to extend and contract in other ways (such as by shifting, scratching, pulling the clutch component 4, etc., to drive the output shaft 33 to move to extend and contract).

[0081] As shown in FIG. 11, FIG. 12a, and FIG. 12b, as an implementation, the clutch member 4 is rotatably connected to an end of the output shaft 33, and the output shaft 33 can rotate relative to the clutch member 4 along its circumferential direction. Since it is required to always holding down the clutch member 4 by a hand when manually pulling the pulling rope 2 to move (if the clutch member 4 is not always held down by a hand, the output shaft 33 will reset under the action of the first elastic member 34, thus the output shaft 33 cannot remain being decoupled from the output gear 321), in order to enable the output shaft 33 to rotate smoothly and thus enable the driven wheel 1 to rotate smoothly, the clutch member 4 is set to be rotatably connected to the output shaft 33 to avoid affecting rotation of the output shaft 33 due to pressing the clutch member 4.

[0082] Of course, in other embodiments, it is also possible to set a corresponding locking mechanism (not shown in the drawings, the locking mechanism may be, for example, an engagement mechanism) to limit the clutch member 4 and/or output shaft 33, so that the output shaft 33 can remain in the second state after the clutch member 4 is pressed. At this time, there is no need to always hold down the clutch member 4 by a hand. After use ends, the clutch member 4 and/or output shaft 33 is manually reset. At this time, the clutch member 4 and the output shaft 33 do not need to be rotatably connected, the two can be fixedly connected.

[0083] As shown in FIG. 9, FIG. 11, FIG. 12a, and FIG. 12b, as an implementation, the output shaft 33 further includes a connection shaft 334, the connection shaft 334 is connected to the second flat shaft 332, and the connection shaft 334 is located at a side of the second flat shaft 332 away from the cylindrical shaft 333. The clutch member 4 is a cap, the clutch member 4 is fastened to an end of connection shaft 334, and the clutch member 4 can rotate relative to connection shaft 334; a circle of first snap slot 3341 is provided on the connection shaft 334, and a flange 41 is provided on the clutch member 4; the flange 41 is clamped in the first snap slot 3341 to prevent the clutch member 4 from disengaging from the connecting shaft 334.

[0084] As shown in FIG. 3, FIG. 6, FIG. 12a, and FIG. 12b, as an implementation, the driving mechanism 3 further includes a housing 35; a first end of the output shaft 33 is located inside the housing 35, and a second end of the output shaft 33 extends outside the housing 35; the output shaft 33 is capable of telescopic movement and rotation relative to the housing 35 (that is, the output shaft 33 can move to extend and retract relative to the housing 35 along its axial direction, and the output shaft 33 can rotate relative to the housing 35 along its circumferential direction). Two ends of the first elastic member 34 abut the output shaft 33 and an inner wall of the housing 35 respectively.

[0085] The transmission assembly 32 is located inside the housing 35, and the transmission assembly 32 is connected to the first end of the output shaft 33 (specifically, the output gear 321 is sleeved on the first end of the output shaft 33). The transmission gear 322 is rotatably connected to the inner wall of the housing 35 through a first rotation shaft 324, and the intermediate gear 323 is rotatably connected to the inner wall of the housing 35 through a second rotation shaft 325.

[0086] Both the driven wheel 1 and the clutch assembly 4 are located outside the housing 35, the clutch member 4 is arranged at a distal end of the second end of the output shaft 33, the driven wheel 1 is sleeved on the output shaft 33, and the driven wheel 1 is located between the clutch member 4 and an outer wall of the housing 35; there is a gap between the driven wheel 1 and the outer wall of the housing 35.

[0087] Specifically, since the transmission assembly 32 is located inside the housing 35, the housing 35 can provide good protection for the transmission assembly 32 to prevent damage occurs on the transmission assembly 32. Since the pulling rope 2 is connected to the driven wheel 1, and the driven wheel 1 is arranged outside the housing 35, the pulling rope 2 is also located outside the housing 35, so that the pulling rope 2 does not need to extend out from the housing 35, which simplifies the structural design and can ensure sealing of the housing 35. Since the clutch member 4 is located outside the housing 35, it is convenient for users to press the clutch member 4 by hands.

[0088] As shown in FIG. 3, FIG. 6, FIG. 12a, and FIG. 12b, as an implementation, the driving motor 31 is arranged outside the housing 35 (specifically, the driving motor 31 is arranged below the housing 35, and the driving motor 31 is fixedly connected to the bottom of the housing 35 through a second screw bolt 382). The driving shaft 310 of the driving motor 31 extends into the housing 35 and is connected to the transmission gear 322 in a transmission way through the motor gear 311. Of course, in other embodiments, the driving motor 31 can also be provided inside the housing 35.

[0089] As shown in FIG. 3, FIG. 12a, and FIG. 12b, as an implementation, a first accommodation groove 12 is provided at a position corresponding to the clutch member 4 on the driven wheel 1. The first accommodation groove 12 is configured to avoid the clutch member 4, so as to prevent the clutch assembly 4 from generating interference with the driven wheel 1 when it is pressed and moves towards the side close to the driven wheel 1 (that is, when pressing the clutch member 4, the clutch member 4 can move into the first accommodation groove 12).

[0090] As shown in FIG. 12a and FIG. 12b, as an implementation, a second accommodation groove 353 is provided at a position corresponding to the output shaft 33 on the inner wall of the housing 35, two ends of the first elastic member 34 abut the output shaft 33 and the inner wall of the second accommodation groove 353 respectively. The second accommodation groove 353 can avoid the output shaft 33, so as to prevent the output shaft 33 from generating interference with the inner wall of the housing 35 when it is moves towards the side away from the clutch member 4 (that is, when the output shaft 33 moves towards the side away from the clutch member 4, an end of the output shaft 33 can be accommodated into the second accommodation groove 353).

[0091] As shown in FIG. 4 to FIG. 6, FIG. 12a, and FIG. 12b, as an implementation, a gasket 37 is provided between the first elastic member 34 and the inner wall of the housing 35, the gasket 37 can avoid the first elastic member 34 from directly contacting the inner wall of the housing 35 and causing wearness of the housing 35.

[0092] As shown in FIG. 4 to FIG. 6, FIG. 12a, and FIG. 12b, as an implementation, a sliding bearing 36 is sleeved on the output shaft 33, and the output shaft 33 is connected to the housing 35 through the sliding bearing 36, so that the output shaft 33 can move to extend and retract and rotate relative to the housing 35 more smoothly.

[0093] As shown in FIG. 4 to FIG. 6, FIG. 12a, and FIG. 12b, as an implementation, the housing 35 includes a front housing 351 and a rear housing 352 that are connected to each other (specifically, the front housing 351 and the rear housing 352 are fixedly connected by a first screw bolt 381). The output shaft 33 passes through the front housing 351, and two ends of the first elastic member 34 abut the output shaft 33 and an inner wall of the rear housing 352 respectively. There are two sliding bearings 36, one of the sliding bearings 36 is arranged between the output shaft 33 and the front housing 351, and the other of the sliding bearings 36 is arranged between the output shaft 33 and the rear housing 352.

[0094] As shown in FIG. 1 to FIG. 3, as an implementation, the driving device further includes a base 5, the driving mechanism 3 is arranged inside the base 5, and the driving mechanism 3 is fixedly connected to the base 5. An outer wall of the base 5 is provided with an assembly groove 51, and both the driven wheel 1 and the clutch member 4 are located in the assembly groove 51; an end of output shaft 33 extends into the assembly groove 51 and is connected to driven wheel 1 and clutch member 4.

[0095] The driving device has two modes: motor driving and manual driving. The working principles of the two modes are as follows: [0096] 1. In the motor driving mode, as shown in FIG. 12a, the output shaft 33 is in the first state, that is, the output shaft 33 is coupled with the driven wheel 1 and the output gear 321 at the same time. At this time, the driving motor 31 can drive the driven wheel 1 to rotate through the transmission assembly 32 and the output shaft 33, and then drive the pulling rope 2 to move, thereby achieving the function of driving the curtain to raise up and fall down by the motor. [0097] 2. In the manual driving mode, as shown in FIG. 12b, when pressing the clutch member 4 by a hand, the clutch member 4 pushes the output shaft 33 to move towards a side close to the first elastic member 34. At this time, the output shaft 33 is decoupled from the output gear 321, and the output shaft 33 remains being coupled with the driven wheel 1. At the same time, the first elastic member 34 is compressed and stores force under the squeezing action of the output shaft 33; the clutch member 4 is kept being pressed by a hand to make the output shaft 33 and the output gear 321 maintain the second state. Then the pulling rope 2 is pulled to move by a hand to achieve manually driving the curtain to raise up and fall down. During the process of manually pulling the pulling rope 2, since the output shaft 33 is decoupled from the output gear 321, the transmission assembly 32 and the driving motor 31 will not move synchronously, thus the pull rope 2 can be easily pulled, without causing damage to the drive mechanism 3.

[0098] After the manual driving mode ends, the clutch member 4 is released (i.e., no longer pressing the clutch member 4 with a hand), and the output shaft 33 loses the pushing effect of the clutch member 4. Therefore, the first elastic member 34 also loses the squeezing effect of the output shaft 33. At this time, the output shaft 33 moves towards the side close to the clutch member 4 under the elastic force of the first elastic member 34 to reset, so that the output shaft 33 is coupled with the output gear 321 again, thereby preparing for driving the curtain to raise up and fall down by the motor next time.

[0099] Another preferred embodiment of the present application further provides an electric curtain comprising the pulling rope 2, a curtain body (not shown in the drawings), and aforesaid driving device; the pulling rope 2 is wound on the driven wheel 1 so that the pulling rope 2 and the driven wheel 1 can move synchronously; the pulling rope 2 is connected to the curtain body. The curtain body can be such as an existing window curtain or rolling curtains in other types, the driving device can drive the curtain body to roll up and/or raise up and falling down.

[0100] As shown in FIG. 1 to FIG. 3, as an implementation, the pulling rope 2 is a bead pulling rope, and the driven wheel 1 is a sprocket. The pulling rope 2 is wound on the driven wheel 1, and the pulling rope 2 meshes with the driven wheel 1 (i.e. the beads of the pulling rope 2 are stuck between the teeth of the driven wheel 1). The structures and the coordination relationship of the pulling rope 2 and the driven wheel 1 can refer to existing technology and will not be elaborated here. Of course, in other embodiments, the pulling rope 2 and the driven wheel 1 can also have other structures.

[0101] Referring to FIG. 13 and FIG. 14, another preferred embodiment of the present application provides an electric curtain applied in intelligent households. The electric curtain includes a driving device 10 and a curtain body, the curtain body can be such as an existing curtain body and mounted on the driving device 10. The electric curtain has two working modes of operating the curtain body: electrically driving the curtain body and manually driving the curtain body.

[0102] The driving device 10 includes a transmission part, the transmission part is connected to the curtain body. In one embodiment, the transmission part includes the transmission assembly 32 and the driven wheel 1, the driven wheel 1 is configured to wind the pulling rope 2, and the pulling rope 2 is connected to the curtain body. In specific arrangement, the curtain body can directly adopt structural types in the existing technology, and the specific structure of the curtain body is not elaborated here.

[0103] The output shaft 33 of the driving device 10 is connected to the driven wheel 1 in a transmission way. When the curtain body is electrically driven to run, the output shaft 33 of the driving device 10 drives the driven wheel 1 to rotate, and the driven wheel 1 drives the pulling rope 2 to move, thereby achieving opening and closing of the curtain body through the pulling rope 2. When manually driving the curtain body to run, the pulling rope 2 is manually operated by a user; the pulling rope 2 drives the driven wheel 1 to rotate, and the driven wheel 1 reversely drives the output shaft 33 of the driving device 10 to rotate. In order to facilitate better manual driving the curtain body to run, the present application, in the following embodiment, has improved other structures in the driving device 10 except the transmission assembly 32.

[0104] Referring to FIG. 15 and FIG. 16, another preferred embodiment of the present application provides a driving device 10, the driving device 10 includes a housing 35, a transmission wheel assembly 200 (in this embodiment, the transmission wheel assembly 200 is equivalent to the transmission assembly 32), a clutch assembly 300, and a driving motor 31; the housing 35 is configured to accommodate the transmission wheel assembly 200 and the clutch assembly 300, and is further configured to fix the transmission wheel assembly 200. The transmission wheel assembly 200 is arranged inside the housing 35, and the transmission wheel assembly 200 includes a first transmission wheel group 210 and a second transmission wheel group, the driving motor is connected to the first transmission wheel group 202, the first transmission wheel group 210 meshes with the second transmission wheel group 202; the clutch assembly 300 movably meshes with the second transmission wheel group 202; the driving motor 31 is connected to the first transmission wheel group 210 and configured to drive the first transmission wheel group 210 to move; the output shaft 33 is connected to the second transmission wheel group 202, and the driven wheel 1 is connected to the output shaft 33 and configured to connect with an external pulling rope, such as the pulling rope 2. Among them, the second transmission wheel group 202 is switched between a first state and a second state in response to movement of the clutch assembly 300; in the second state, the second transmission wheel group 202 rotates in response to rotation of the driven wheel 1, so as to realize that the driven wheel 1 drives the curtain body to move under action of external manually driving force coming from the external pulling rope; in the first state, the second transmission wheel group 202 drives the driven wheel 1 in response to rotation of the first transmission wheel group 210, and thereby drives the curtain body to move. It can be understood that the first state and the second state in this embodiment are respectively equivalent to the first state and the second state in the aforesaid embodiment shown in FIG. 1 to FIG. 12b, and the clutch assembly 300 in this embodiment is another implementation of the clutch member 4 in the aforesaid embodiment shown in FIG. 1 to FIG. 12b, the two embodiments can realize similar technical effect.

[0105] In above driving device 10 and electric curtain system, when manual driving of the curtain body is required, a user can move the clutch assembly 300 to make the second transmission wheel group 202 switch from the first state to the second state in response to the movement of the clutch assembly 300. At this time, the second transmission wheel group 202 rotates in response to rotation of the driven wheel 1, and the driven wheel 1 can drive the curtain body to move under action of the external manual driving force coming from the external pulling rope, thereby achieving manual opening and closing of the curtain body. When driving the curtain body by the driving motor 31 is required, the clutch assembly 300 can be reset, so that the second transmission wheel group 202 switches from the second state to the first state in response to the movement of the clutch component 300. At this time, the driving motor 31 can drive the first transmission wheel group 210 to move, and the second transmission wheel group 202 responds to rotation of the first transmission wheel group 210 to drive the driven wheel 1, thereby driving the curtain body to move and achieving electric opening and closing of the curtain body. Therefore, the above electric curtain has two curtain body operation working modes of electrically driving the curtain body to operate and manually driving the curtain body to operate, and manually driving the curtain body is convenient and labor-saving in operation, with low failure rate and good user experience.

[0106] Furthermore, as shown in FIG. 15 and FIG. 16, in some embodiments, the second transmission wheel group 202 includes a planetary wheel group 220, an annular gear 230, and a planet carrier 240, the planetary wheel group 220 is located inside the annular gear 230, the planetary wheel group 220 meshes with the annular gear 230, and the planetary wheel group 220 further meshes with the first transmission wheel group 210; the planetary carrier 240 is connected with the first transmission wheel group 210, and the planetary carrier 240 is further connected with the planetary wheel group 220; the planetary carrier 240 forms the output shaft 33, and the output shaft 33 is connected with the driven wheel 1. The clutch assembly 300 is arranged between an outer wall of the annular gear 230 and the housing 35, and the clutch assembly 300 can move between the annular gear 230 and the housing 35. The driving motor 31 is connected to the first transmission wheel group 210, and the driving motor 31 is configured to drive the first transmission wheel group 210 to move.

[0107] Among them, referring to FIG. 17, FIG. 18, FIG. 19, and FIG. 20, the driving device 10 has the first state and the second state, and the annular gear 230 switches between the first state and the second state in response to movement of the clutch assembly 300; in the second state, the annular gear 230 is rotatable relative to the housing 35, so that the driven wheel 1, the planetary carrier 240, the annular gear 230, and the planetary wheel group 220 form a power system, the annular gear 230 rotates in response to rotation of the planetary carrier 240, the planetary wheel group 220 rotates under drive of the planetary carrier 240 at this time, so as to realize that the driven wheel 1 drives the curtain body to move under action of external manual driving force, wherein the external manual driving force can be manually pulling the curtain body by a user. In the first state, the annular gear 230 is fixed to the housing 35, the driving motor 31, the first transmission wheel group 210, the planetary wheel group 220, the planetary carrier 240, and the driven wheel 1 form a power system, the planetary wheel group 220 rotates in response to rotation of the first transmission wheel group 210, then the planetary wheel group 220 drives the planetary carrier 240 to move, thereby driving the curtain body to move through the driven wheel 1.

[0108] In one example, referring to FIG. 15 and FIG. 16, the housing 35 includes a front housing 351, a rear housing 352, a partition plate 130, and a cover plate 140. The cover plate 140 is fixed to the rear housing 352 by multiple first screws 150, and the rear housing 352 is fixedly connected to the front housing 351 by multiple second screws 160 to form a storage space for the transmission wheel assembly 200 and the clutch assembly 300. The partition plate 130 is fixed to the rear housing 352 to separate the first transmission wheel group 210 from the planetary wheel group 220. In one example, an end of the planetary carrier 240 has a first shaft end 242 and multiple second shaft ends 243, the planetary carrier 240 is mounted on the rear housing 352 through a first bearing 170 and a second bearing 180, the multiple second shaft ends 243 surround an outer side of the first shaft end 242, and another end of the planetary carrier 240 forms the output shaft 33. In one example, the driving motor 31 can be a motor or a combination of a motor and a reduction mechanism to provide rotational power, and a distal end of the first transmission wheel group 210 is mounted on the front housing 351 through a third bearing 190 to facilitating rotatable mounting of the first transmission wheel group 210.

[0109] The first transmission wheel group 210 has multiple kinds of structural types. In a preferred embodiment, referring to FIG. 15 and FIG. 16, the first transmission wheel group includes a worm wheel 211, a worm rod 212, a first gear 213, a second gear 214, and a sun gear 215. The worm rod 212 is connected to an output end of the driving motor 31, and the worm rod 212 meshes with the worm wheel 211. The first gear 213 is coaxially connected to the worm wheel 211 through a third rotation shaft 216, and the first gear 213 and the worm wheel 211 are mounted on the housing 35 through the third rotation shaft 216, the first gear 213 and the worm wheel 211 can rotate around an axis of the third shaft rotation 216 relative to the housing 35. The second gear 214 is mounted on the housing 35 through a fourth rotation shaft 217, and the second gear 214 is rotatable relative to the housing 35, the second gear 214 meshes with the first gear 213. The sun gear 215 has a large annular gear 2151 and a small annular gear 2152, the sun gear 215 is mounted on the first shaft end 242 of the planetary carrier 240 by means of embedding, key connection, etc., the large annular gear 151 of the sun gear 215 meshes with the second gear 214, and the small annular gear 2152 of the sun gear 215 meshes with the planetary gear group 220. In this way, the driving motor 31 inputs power, the power is transmitted through worm gear 211 and worm rod 212 to achieve a first stage of power transmission and direction change; the power continues to be transmitted through the first gear 213, the second gear 214, and the large annular gear 2151 to achieve second and third stages of transmission in the same direction; then the power is transmitted to planetary gear set 220 through the small annular gear 2152 to achieve a fourth stage of power transmission, so that the driving motor 31 can conveniently and reliably drive the planetary gear group 220.

[0110] The planetary gear group 220 has multiple kinds of structural types. Specifically, referring to FIG. 3 and FIG. 4, the planetary gear group 220 includes multiple planetary gears 221, the multiple planetary gears 221 are rotatably mounted on the second shaft ends 243 of the planet carrier 240 by means of embedding, key connection, etc.; the multiple planetary gears 221 are evenly distributed in the annular gear 230, and the multiple planetary gears 221 mesh with the annular gear 20 respectively; the multiple planetary gears 221 surround an outside the small annular gear 2152 of the sun gear 215, and the multiple planetary gears 221 mesh with the small annular gear 2152 of the sun gear 215 respectively.

[0111] When the driving device 10 is in the first state, the clutch assembly 300 and the annular gear 230 are in the first state. The annular gear 230 cannot rotate relative to the housing 35. The power input by the driving motor 31 is transmitted through its output end to the first transmission wheel group 210, and then transmitted to the sun gear 215 through power transmission of the first transmission wheel group 210. The planetary gears 221 mesh with the small annular gear 2152 of the sun gear 215, so the small annular gear 2152 of the sun gear 215 can drive the planetary gears 221 to rotate accordingly. The planetary gears 221 also mesh with the inner side of the annular gear 230, and the annular gear 230 is fixed at this time, so the planetary gears 221 will revolve around the sun gear 215 inside the annular gear 230. It can be understood that as the multiple planetary gears 221 are rotatably mounted on the second shaft ends 243 of the planetary carrier 240, when the multiple planetary gears 221 revolve around the sun gear 215, they will also drive the planetary carrier 240 and the output shaft 33 of the planetary carrier 240 to rotate together. The output shaft 33 of the planetary carrier 240 will also drive the driven wheel 1 to rotate together, so that the driven wheel 1 drives the pulling rope 2 to move, thereby driving the curtain body to open and close.

[0112] When it is necessary to manually drive the pulling rope 2 to move, the clutch assembly 300 is manually moved to make the clutch assembly 300 and the annular gear 230 switch from the first state to the second state. It can be understood that if the pulling rope 2 is manually driven to move, the driving motor 31 will not be started, and the sun gear 215 in the first transmission wheel group 210 driven by the driving motor 31 will not rotate, which is equivalent to locking the sun gear 215. At this time, if the annular gear 230 is not switched from the first state to the second state, it means that the annular gear 230 is also locked, that is, both the annular gear 230 and the sun gear 215 are locked; since the multiple planetary gears 221 mesh between the inner side of the annular gear 230 and the small annular gear 2152 of the sun gear 215, when both the annular gear 230 and the sun gear 215 are locked, obviously, the planetary gears 221 and the planetary carrier 240 driven by the planetary gear 221 cannot rotate. Therefore, when it is required to manually drive the pulling rope 2 to move, the clutch assembly 300 and the annular gear 230 need to be switched from the first state to the second state. At this time, the sun gear 215 does not rotate, while the annular gear 230 can rotate, thus it is possible to drive the driven wheel 1 to rotate through the pulling rope 2, then drive the output shaft 33 of the planetary carrier 240 to rotate, so that the planetary carrier 240 drives the planetary gear s221 to rotate, and the planetary gears 221 drive the annular gear 230 to rotate. Among them, although the sun gear 215 does not rotate, the planetary gears 221 meshing between the inner side of the annular gear 230 and the sun gear 215 can rotate because the annular gear 230 is not locked, and the annular gear 230 also rotates together without hindering rotation of the planetary gears 221. Therefore, when the output shaft 33 needs to drive the planetary carrier 240 to rotate, the multiple planetary gears 221 on the planetary carrier 240 can revolve around the small annular gear 2152 of the sun gear 215, and at this time, the first transmission wheel group 210 will not move under small rotational force due to its reverse driving meshing resistance, so that the user can easily pull the curtain body to open and close.

[0113] In one example, switching from the first state to the second state can be realized through the following actions: the clutch assembly 300 is manually driven to move in a direction away from the annular gear 230, an end of the clutch assembly 300 separates from an outer wall of the annular gear 230, and the clutch assembly 300 and the annular gear 230 switch from the first state to the second state. In one example, when manually driving the pulling rope 2 to move, the pulling rope 2 drives the driven wheel 1 to rotate, the driven wheel 1 drives the planetary carrier 240 to rotate accordingly, the planetary carrier 240 drives the planetary gears 221 to rotate accordingly, and the planetary gears 221 drive the annular gear 230 to rotate accordingly. It should be noted that during the movement of manually driving the pulling rope 2, manually pulling the the clutch assembly 300 can be always maintained, so that the clutch assembly 300 and the annular gear 230 are always in the second state. Of course, in order to facilitate the operation of manually driving the pulling rope 2, a limit piece that cooperates with the clutch assembly 300 can also be provided. After manually pulling the clutch assembly 300 once, the clutch assembly 300 cooperates with the limit piece to make the clutch assembly be kept in the second state. At this time, there is no need to keep manually pulling the clutch assembly 300, which can free up a palm of the user and make manually driving the pulling rope 2 be more convenient.

[0114] In order to facilitate switching between the first state and the second state, in a preferred embodiment, referring to FIG. 17, FIG. 18, FIG. 19, and FIG. 20, when two ends of the clutch assembly 300 abut the outer wall of the annular gear 230 and the inner wall of the housing 35 respectively, the driving device 10 is in the first state, and the annular gear 230 is in the first state relative to the housing 35, so that the clutch assembly 300 blocks the movement trend of the annular gear 230. The clutch assembly 300 can fix the annular gear 230 inside the housing 35, and the driving motor 31 is in a state that can drive the first transmission wheel group 210 to move forward; when the driving motor 31 is powered, the driving motor 31 drives the first transmission wheel group 210 to move forward. When an end of the clutch assembly 300 is separated from the outer wall of the annular gear 230, the driving device 10 is in the second state, and the annular gear 230 is in the second state relative to the housing 35, so that the movement trend of the annular gear 230 will not be blocked by the clutch assembly 300. The annular gear 230 can rotate inside the housing 35, so that the first transmission wheel set 210 is in a reverse motion locking state. At this time, the annular gear 230 responds to the movement of the planetary carrier 240 but cannot drive the first transmission wheel group 210 to move in an opposite direction. Therefore, by determining whether the ends of the clutch assembly 300 abut the outer wall of the annular gear 230 and the inner wall of the housing 35, it can be relatively easy to switch from the first state to the second state and switch from the second state to the first state.

[0115] In order to facilitate achieving resetting of the first state, specifically, referring to FIG. 17, FIG. 18, FIG. 19, and FIG. 20, the driving device 10 further includes a second elastic member 600, the clutch assembly 300 can include a clutch rod, of which a side wall protrudes to form a baffle plate 500, the second elastic member 600 abuts between opposite surfaces of the baffle plate 500 and of the housing 35, and the second elastic member 600 is configured to move towards the annular gear 230 along a direction of movement of the clutch assembly 300.

[0116] In one embodiment, the baffle plate 500 can be integrated with the clutch assembly 300 for easy manufacturing. When it is required to manually drive the curtain body to run, a user pulls the clutch assembly 300 in a direction away from the annular gear 230, an end of the clutch assembly 300 leaves the outer wall of the annular gear 230, and the second elastic member 600 is further compressed by the baffle plate 500, thereby switching from the first state to the second state. During the entire process of manually pulling the pulling rope 2, pulling the clutch assembly 300 is maintained, so that the pulling rope 2 can be smoothly pulled. After manually driving the curtain body to run is completed, when the clutch assembly 300 is released, the second elastic member 600 automatically rebounds and pushes the baffle plate 500 to move towards the annular gear 230, so that two ends of the clutch assembly 300 abut the outer wall of the annular gear 230 and the inner wall of the housing 35, thereby easily switch from the second state to the first state and facilitating subsequent electric driving of the curtain body.

[0117] In order to improve reliability and stability of the first state, referring to FIG. 15 and FIG. 16, specifically, the outer wall of the annular gear 230 forms multiple recesses 231, the recesses 231 open to the outer wall of the annular gear 230, and the multiple recesses 231 are evenly distributed in the circumferential direction of the annular gear 230. The opening of each recess 231 is adapted to an end of the clutch assembly 300, and the multiple recesses 231 can be matched with concave and convex of the end of the clutch assembly 300, so that an end face of the clutch assembly 300 is located inside the recesses 231. The end of the clutch assembly 300 and side walls of the recesses 231 block each other to avoid accidental release of the first state during collision impact or misoperation. The end of the clutch assembly 300 can stably abut against the annular gear 230, thereby improving reliability and stability of the first state.

[0118] In order to facilitate movement of the clutch assembly 300, in a preferred embodiment, referring to FIG. 15 and FIG. 16, specifically, a side wall of the clutch assembly 300 is provided with a protruding shaft 700, and the housing 35 defines a first through groove 141 extending along a direction of movement of the clutch assembly 300. The protruding shaft 700 passes through the first through groove 141, so that the protruding shaft 700 is exposed through the first through groove 141 and used to operate the protruding shaft 700 more easily, thereby facilitating achieving manual clutch operations of the clutch assembly 300. In one example, the first through groove 141 is provided on the cover plate 140 of the housing 35, and an extension length of the first through groove 141 is at least greater than the sum of the depth of the groove 231 and the maximum outer contour size of the protruding shaft 700, in order to facilitate the release of the first state. In one example, the protruding shaft 700 can be integrated with the clutch component 300 for ease of manufacturing.

[0119] In order to facilitate operation, specifically, referring to FIG. 13, FIG. 15, and FIG. 16, the driving device 10 further includes a clutch push block 800, an end of the clutch push block 800 is formed with a sleeve 810, and an other end of the clutch push block 800 is formed with an operating end 820 for manual clutch. The sleeve 810 is sleeved on the protruding shaft 700. When the clutch assembly 300 is manually operated for clutch, simply moving the clutch push block 800 can achieve movement of the clutch assembly 300 conveniently. Through the clutch push block 800, it is possible to adapt to different sizes of driving devices 10, so that the structural components inside the housing 35 are arranged compactly and applicable to extension of the protruding shaft 700 and improvement into various structural forms for operation.

[0120] In order to facilitate electrically driving the curtain body for control, specifically, referring to FIG. 13, FIG. 15, and FIG. 16, the driving device 10 further includes an electrical control assembly 900, the electrical control assembly 900 is provided with a first through hole 910 and a second through groove 920; the electrical control assembly 900 is arranged at a side of the clutch push block 800 away from the housing 35, and the electrical control assembly 900 covers on the housing 35; the electronic control assembly 900 is connected in communication with the driving motor 31 through a cable, and a side of the electrical control assembly 900 is provided with an electrical button 930; in the first state, by pressing the electrical button 930, the electrical control assembly 900 controls the driving motor 31 to start, and the driving motor 31 drives the transmission wheel assembly 200 to move, thereby realizing electrical driving of the curtain body. The output shaft 33 passes through the first through hole 910, and the output shaft 33 extends to a side of the electronic control assembly 900 away from the housing 35, so that the arrangement of the electronic control assembly 900 will not affect connection between the output shaft 33 and the driven wheel 1; the second through groove 920 forms a clutch operation window, and the second through groove 920 accommodates the operating end 820 to further improve convenience of manual clutch operations.

[0121] In above electric curtain, when manually driving the curtain body is required, a user moves the clutch assembly 300, and the annular gear 230 switches from the first state to the second state in response to the movement of the clutch assembly 300. At this time, the annular gear 230 can rotate relative to the housing 35, the driven wheel 1, planetary carrier 240, annular gear 230, and planetary gear group 220 form a power system. The user manually drives the driven wheel 1, the driven wheel 1 drives the planetary carrier 240 to rotate through the output shaft 33, and the planetary carrier 240 drives the planetary gear group 220 and the annular gear 230 to rotate. At this time, the first transmission wheel group 210 will not move due to its reverse driving meshing resistance, and the driven wheel 1 can easily continue to move and drive the curtain body to move accordingly, thereby achieving manual opening and closing of the curtain body.

[0122] When electrically driving the curtain body is required, the clutch assembly 300 is reset, and the annular gear 230 switches from the second state to the first state in response to the movement of the clutch assembly 300. At this time, the annular gear 230 is fixed relative to the housing 35, the driving motor 31, the first transmission wheel group 210, the planetary wheel group 220, the planetary carrier 240, and the driven wheel 1 form a power system, which can electrically drive the curtain body in the first state. At this time, the driving motor 31 drives the first transmission wheel group 210 to move, the first transmission wheel group 210 drives the planetary wheel group 220 to rotate relative to the annular gear 230, the planetary wheel group 220 drives the planetary carrier 240 and the driven wheel 1 to rotate accordingly, and the driven wheel 1 drives the curtain body to move accordingly, thereby achieving electric opening and closing of the curtain body. Therefore, the aforesaid electric curtain has two types of curtain body driving modes: electrically driving the curtain body and manually driving the curtain body. When the curtain body is manually driven, the operation is convenient and labor-saving, the failure rate is low, and the electric curtain has stronger endurance and better user experience.

[0123] The electric curtain provided by the present application can further include a curtain anti-drop device for a pulling rope in order to improve use experience. Referring to FIG. 21, a preferred embodiment of the present application provides an electric curtain including a curtain anti-drop device and a pulling rope 2, the specific type of the pulling rope 2 As an implementation adopts a bead pulling rope. The curtain anti-drop device includes an anti-drop structure 1A and a power structure 2A, the power structure 2A is connected to the pulling rope 2, and the power structure 2A is configured to provide rotation power to the pulling rope 2; the anti-drop structure 1A is connected to the pulling rope 2 and power structure 2A respectively, and the anti-drop structure 1A is configured to press the pulling rope 2 against the power structure 2A, so as to prevent the pulling rope 2 from detaching from the power structure 2A.

[0124] Specifically, referring to FIG. 22, the power structure 2A includes a driven wheel 1 and a front housing 351. The driven wheel 1 is rotatably connected to the front housing 351, and the driven wheel 1 is configured to mesh with the pulling rope 2 and further configured to drive the pulling rope 2 to rotate. The anti-drop structure 1A includes a clamping arm 11A, wherein the clamping arm 11A is rotatably connected to the front housing 351, and the clamping arm 11A is configured to press the pulling rope 2 against the driven wheel 1.

[0125] It should be noted that the power structure 2A further includes a motor, and an output end of the motor is connected to the driven wheel 1. The motor is configured to drive the driven wheel 1 to rotate, then the driven wheel 1 drives the pulling rope 2 to rotate; the curtain body further include curtain body, the pulling rope 2 rotates to drive the curtain body to open and close, thereby achieving opening and closing functions of the electric curtain.

[0126] In an embodiment, the clamping arm 11A is rotatably connected to the front housing 351 and presses the pulling rope 2 against the driven wheel 1. When the pulling rope 2 is subjected to long-term force and its circumference becomes longer, a part of the pulling rope 2 in contact with the clamping arm 11A still meshes with the driven wheel 1 under the contact action of the clamping arm 11A. Therefore, when the driven wheel 1 rotates, it can still drive the pulling rope 2 to rotate. Compared with the existing technology, the present application provides the clamping arm 11A. Under the contact action of the clamping arm 11A, at least a part of the pulling rope 2 is always in a state of meshing with the driven wheel 1, thus the problem of the pulling rope 2 disengaging is effectively solved, the practicality of the device is improved, and the normal opening and closing functions of the curtain is ensured. Window curtains using this curtain anti-drop device can prevent the pulling rope 2 from detaching from the power structure 2A and avoid the power structure 2A from being unable to transmit power to the pulling rope 2, which may cause the pulling rope 2 to fail to drive the curtain fabric to open and close normally, affecting normal use of the window curtain.

[0127] Referring to FIG. 23, the driven wheel 1 is provided with multiple second snap slots 221A along its circumferential direction, the second snap slots 221A are configured to engage with the pulling rope 2. The multiple second snap slots 221A can increase the range of engagement between the pulling rope 2 and the driven wheel 1. The clamping arm 11A presses the pulling rope 2 in the second snap slots 221A to prevent the pulling rope 2 from disengaging from the second snap slots 221A. Through the engagement action of the second snap slots 221A, the rotation of the driven wheel 1 can drive the pulling rope 2 to rotate, thereby driving a window curtain to open and close.

[0128] The number of the aforesaid clamping arms 11A can be at least two, and the at least two clamping arms 11A are arranged at opposite sides of the driven wheel 1. The at least two clamping arms 11A press the pulling rope 2 in the second snap slot 221A respectively, thus the range of engagement between the pulling rope 2 and the driven wheel 1 is further increased, which is beneficial for the driven wheel 1 to drive the pulling rope 2 to rotate and prevents the pulling rope 2 from disengaging from the driven wheel 1.

[0129] In an alternative embodiment, the number of the clamping arm 11A can also be one, and the clamping arms 11A encircles the outer side of the driven wheel 1. If one clamping arm 11A is provided, the clamping arm 11A is arranged around the outer side of the driven wheel 1 in a circle, and the annular clamping arm 11A holds the pulling rope 2 and the driven wheel 1 tightly. This arrangement can also increase the range of engagement between the pulling rope 2 and the driven wheel 1, which is beneficial for the driven wheel 1 to drive the pulling rope 2 to rotate.

[0130] Referring to FIG. 24, the clamping arm 11A includes a connection part 111A and a clamping part 112A that are connected with each other, the connection part 111A is rotatably connected to the front housing 351, and the clamping part 112A bends and extends towards a direction close to the driven wheel 1.

[0131] In an embodiment, the clamping arm 11A is rotatably connected to the front housing 351 through the connection part 111A, this arrangement can prevent the clamping arm 11A from obstructing rotation of the pulling rope 2. Specifically, multiple beads are connected in series on the pulling rope 2, and the diameters of the multiple beads may have certain differences. Therefore, the present application rotatably connects the clamping arm 11A to the front housing 351; when beads of different diameters come into contact with the clamping arm 11A, beads with larger diameters can push the clamping arm 11A apart, thereby avoiding the clamping arm 11A from obstructing rotation of the beads, so that the pulling rope 2 rotates more smoothly during operation, thereby solving the problem of adaptability of the pulling rope 2 and improving practicality of the device. Moreover, the clamping portion 112A of the clamping arm 11A encircles around the outer side of the driven wheel 1, so that the clamping portion 112A is more closely attached to the outer side of the driven wheel 1, thereby increasing the meshing range between the pulling rope 2 and the driven wheel 1.

[0132] Referring to FIG. 24 again, the clamping part 112A is provided with a convex strip 114A, the convex strip 114A is located on a side of the clamping part 112A near the driven wheel 1, and the convex strip 114A is configured to press the pulling rope 2 against the driven wheel 1.

[0133] In one embodiment, the convex strip 114A extends towards a direction close to the driven wheel 1, by this arrangement, at least a part of the convex strip 114A can extend into the driven wheel 1. The convex strip 114A presses the pulling rope 2 against the second snap slot 221A, thereby enhancing the stability of the connection between the pulling rope 2 and the second slot slot 221A, and further preventing the pulling rope 2 from coming out of the second snap slot 221A.

[0134] Referring to FIG. 25 and FIG. 26, the aforementioned anti-drop structure 1A includes a third elastic member 12A, and one side of the front housing 351 extends towards a direction away from the clamping arm 11A to form a protruding part 212A; an end of the third elastic member 12A is elastically connected to the clamping arm 11A, and the other end is wound around the protruding part 212A. The third elastic member 12A is configured to push the clamping arm 11A to rotate towards a direction close to the driven wheel 1.

[0135] In one embodiment, in order to enhance the contact effect of the clamping arm 11A, the present application provides the third elastic member 12A, and the third elastic member 12A elastically connects the clamping arm 11A and the front housing 351 respectively. When the clamping arm 11A is pushed away, that is, when the clamping arm 11A rotates towards a direction away from the driven wheel 1, the clamping arm 11A is pushed to rotate towards a direction close to the driven wheel 1 by the restoring elastic force of the third elastic member 12A, so that it presses the pulling rope 2 against the second slot 221A again, thereby improving practicality of the device. Among them, the third elastic member 12A can adopt a torsion spring.

[0136] In some other embodiments, the clamping arm 11A can be made of elastic material, and the clamping arm 11A is pushed to rotate towards the direction close to the driven wheel 1 by elasticity of the clamping arm 11A itself, which can also provide the effect of enhancing the contact effect of the clamping arm 11A.

[0137] Specifically, when the clamping arm 11A rotates towards a direction away from the driven wheel 1, the clamping arm 11A pushes the third elastic member 12A to move, so that the third elastic member 12A generates elastic deformation, and the third elastic member 12A pushes the clamping arm 11A to rotate towards a direction close to the driven wheel 1 through the elastic deformation.

[0138] In practical use, an end of the third elastic member 12A is connected to the clamping arm 11A, and the other end is connected to the front housing 351. As an implementation, the third elastic member 12A adopts a torsion spring. When the clamping arm 11A rotates towards a direction away from the driven wheel 1, the clamping arm 11A drives the third elastic member 12A to twist, causing it to undergo elastic deformation and store torsional energy. When the clamping arm 11A stops rotating, the third elastic member 12A begins to release torsional energy, restoring itself to an untwisted state. Therefore, the third elastic member 12A generates a reverse torque, this torque pushes the clamping arm 11A to rotate towards a direction close to the driven wheel 1, causing it to press the pulling rope 2 against the driven wheel 1 again.

[0139] Referring to FIG. 26 and FIG. 27, the connection part 111A is provided with a convex post 113A, the convex post 113A is arranged at a side of the connection part 111A near the front housing 351; the front housing 351 is provided with a rotation groove 213A, the convex post 113A is inserted in the rotation groove 213A and rotatably cooperates with the rotation groove 213A.

[0140] In an embodiment, the convex post 113A is connected to a side of the connection part 111A near the front shell 351, and rotatably cooperates with the rotation groove 213A on the front housing 351. An end of the third elastic member 12A is connected to the protruding part 212A, and another end is connected to the convex post 113A. When the clamping arm 11A is pushed away, the convex post 113A follows the clamping arm 11A to rotate in the rotation groove 213A, and drives the third elastic member 12A to twist, thereby making it store torsional energy. By the third elastic member 12A releasing the torsional energy, the reset function of the clamping arm 11A is achieved. The convex post 113A provides a portion for the connection of the third elastic member 12A, the structure is simpler and assembly is easier.

[0141] Referring to FIG. 27 again, the rotation groove 213A bends and extends on the front housing 351, and the convex post 113A is insert into the rotation groove 213A and slides inside the rotation groove 213A. The rotation groove 213A bends and extends to a certain length on the front housing 351, and the convex post 113A rotates inside the rotating groove 213A, the rotation groove 213A with a certain length plays a limiting role on the convex post 113A, thereby restricting the rotation angle of the convex post 113A and avoiding an excessive rotation angle of the convex post 113A, which may cause a twist angle of the third elastic member 12A excesses its own elastic limit, resulting in that the third elastic member 12A generates permanent deformation and cannot be restored, affecting the normal function of the device.

[0142] Referring to FIG. 27 and FIG. 28, the anti-drop structure includes a rotation element 13A, the front housing 351 is provided with a first mounting groove 211A, and the rotation element 13A extends into the first mounting groove 211A and is connected to the front housing 351; the connection part 111 is provided with a second mounting groove 115A, and the connection part 111A is sleeved on the outer circumference of the rotation element 13A through the second mounting groove 115A and rotatably cooperates with the rotation element 13A.

[0143] In an embodiment, it is possible to first insert the rotation element 13A into the first mounting groove 211A of the front housing 351, then sleeve the connection part 111A on the rotation element 13A to finish the rotatable connection between the clamping arm 11A and the front housing 351. This arrangement makes assembly of the device be simpler and easier.

[0144] The connection part 111A further includes a rolling sleeve 116A, the rolling sleeve 116A is sleeved on an outer circumference of the rotation element 13A and located in the second mounting groove 115A.

[0145] Specifically, the rotation element 13A is inserted into the first mounting groove 211A of the front housing 351 first, the rolling sleeve 116A is placed in the second mounting groove 115A, and then both the rolling sleeve 116A and the connection part 111A are sleeved on the outer circumference of the rotation element 13A to finish the rotatable connection between the clamping arm 11A and the front housing 351; the arrangement of the rolling sleeve 116A can reduce wearness of the clamping arm 11A when it rotates relative to the rotation element 13A, thereby extending the mechanical life of the clamping arm 11A.

[0146] Referring to FIG. 28 again, the anti-drop structure 1A further includes a lock element 15A, the lock element 15A passes through the first mounting groove 211A and is connected to the rotation element 13A to fix the rotation element 13A with the front housing 351.

[0147] In an embodiment, the rotating element 13A is inserted in the first mounting groove 211A from the top of the front housing 351, and the lock element 15A extends into the first mounting groove 211A from the bottom of the front housing 351 and is connected to the rotation element 13A, so that the rotation element 13A is fixedly connected with the front housing 351. Then the connection part 111A is sleeved onto the rotation element 13A, and the connection part 111A can rotate relative to the rotation element 13A to achieve the rotational connection between the clamping arm 11A and the front housing 351. The present application, by setting the lock element 15A, prevents the rotation element 13A from disengaging from the front housing 351, and further prevents the clamping arm 11A from disengaging from the front housing 351, thereby enhancing the connection stability between the clamping arm 11A and the front housing 351. Among them, the lock element 15A can adopt screws or rivets.

[0148] Referring to FIG. 28 again, the rotation element 13A includes a rod body 131A and a limiting part 133A, the rod body 131A extends into the first mounting groove 211A and is connected to the front housing 351, the connection part 111A is sleeved on an outer circumference of the rod body 131A through the second mounting groove 115A and rotatably cooperates with the rod body 131A, the limiting part 133A is connected to the rod body 131A in a circular direction, and the limiting part 133A abuts the front housing 351.

[0149] In practical use, in order to further restrict axial movement of the rotation element 13A relative to the front housing 351, the present application provides the limiting part 133A on the rotation element 13A, the limiting part 133A is connected to the circumference of the rod body 131A in a circular direction. When the rod body 131A is inserted into the first mounting groove 211A, the limiting part 133A is located above the front housing 351 and abuts the front housing 351 to limit axial downward movement of the rod body 131A relative to the front housing 351. The lock element 15A extends from the bottom the front housing 351 into the first mounting groove 211A and is connected to the rotation element 13A to limit axial upward movement of the rod body 131A relative to the front housing 351. In this way, by the limiting part 133A and the lock element 15A, axial movement of the rotation element 13A relative to the front housing 351 is restricted, which prevents the rotating component 13A from disengaging from the front housing 351, and thereby prevents the clamping arm 11A from disengaging from the front housing 351.

[0150] An end of the aforementioned rotation element 13A extending out of the second mounting groove 115A is provided with a limiting slot 132A, and the anti-drop structure 1A includes a snap element 14A, the snap element 14A is inserted in the limiting slot 132A and abuts the connection part 111A.

[0151] In an embodiment, an end of the rotation element 13A extending out of the second mounting groove 115A is provided with a circumferential limiting slot 132A. The snap element 14A is inserted in the limiting slot 132A, and the snap element 14A provides axial limiting and restricting for the clamping arm 11A to prevent the clamping arm 11A from disengaging from the rotating component 13A and enhance the stability of the connection between the clamping arm 11A and the front housing 351. As an implementation, the snap element 14A can adopt an E-type clamping spring.

[0152] Differing from the existing technology, embodiments of the present application provides an electric curtain and a curtain anti-drop device, the curtain anti-drop device includes the anti-drop structure 1A and the power structure 2A. The power structure 2A includes the driven wheel 1 and the front housing 351, the driven wheel 1 is rotatably connected to the front housing 351, and the driven wheel 1 is configured to mesh with the pulling rope 2 and further configured to drive the pulling rope 2 to rotate. The anti-drop structure 1A includes the clamping arm 11A, the clamping arm 11A is rotatably connected to the front housing 351, and the clamping arm 11A is configured to press the pull rope 2 against the driven wheel 1. Compared with the existing technology, the clamping arm 11A is rotatably connected to the front housing 351 and presses the pulling rope 2 against the driven wheel 1; under the pressing action of the clamping arm 11A, at least a part of the pulling rope 2 always remains the state of meshing with the driven wheel 1, thereby effectively solving the problem of disengagement of the pulling rope 2. The electric curtain using this anti-drop device, such as an electric window curtain, can prevent the pulling rope 2 from detaching from the power structure 2A, thereby avoiding the power structure 2A from being unable to transmit power to the pulling rope 2, which may cause the pulling rope 2 to fail to drive a curtain body to open and close normally and affect the normal use of the curtain.

[0153] The electric curtain provided by the present application can further include a tension adjusting device for pulling ropes so as to improve use experience. Referring to FIG. 29, a preferred embodiment of the present application provides an electric curtain, for example, it can be an electric window curtain, which includes a power member 3B, a pulling rope 2, and a tension adjusting device 1B. In this embodiment, the specific type of the pulling rope 2 adopts a bead pulling rope. The pulling rope 2 is wound on the tension adjusting device 1B and connected to the power member 3B, the power member 3B is configured to drive the pulling rope 2 to rotate, and the tension adjusting device 1B is configured to tension the pulling rope 2.

[0154] It should be noted that the electric curtain further includes a rotation shaft and a curtain body arranged on the rotating shaft. The power member 3B includes a driven wheel 1 and a driving motor, and an output end of the driving motor is connected to the driven wheel 1.

[0155] In an embodiment, both the power member 3B and the tension adjusting device 1B can be fixed to a wall. An end of the pulling rope 2 is wound on the driven wheel 1 and meshes with the driven wheel 1, and another end is connected to the rotation shaft. The driving motor drives the driven wheel 1 to rotate, the driven wheel 1 drives the pulling rope 2 to rotate, and the pulling rope 2 drives the rotation shaft to rotate, thereby achieving opening and closing of the curtain body. When the pulling rope 2 disengages from the driven wheel 1 due to long-term stress, the tension degree of the pulling rope 2 can be adjusted by the tension adjusting device 1B, so that the pulling rope 2 meshes with the driven wheel 1 again to ensure that the electric curtain meets its normal use function.

[0156] It can be understood that the pulling rope 2 is usually a circular chain structure, with multiple beads or spheres connected in series on the chain; the driven wheel 1 is provided with multiple snap slots along its circumferential direction, the snap slots are configured to engage with the beads or spheres on the pulling rope 2 to achieve meshing between the pulling rope 2 and the driven wheel 1.

[0157] Referring to FIG. 30, the tension adjusting device 1B includes an outer housing 11B, a tension structure 12B, and a driving structure 13B; the outer housing 11B is configured to fixed to a wall; the tension structure 12B includes a first wheel 121B and a second wheel 122B, the first wheel 121B is movably connected to the outer housing 11B, the second wheel 122B is connected to the outer housing 11B, the first wheel 121B and the second wheel 122B are sequentially arranged along a length direction of the outer housing 11B, and the first wheel 121B and the second wheel 122B are configured for winding the pulling rope 2; the driving structure 13B is connected to the first wheel 121B, and the driving structure 13B is configured to drive the first wheel 121B to move along a width direction of the outer housing 11B.

[0158] In order to describe clearly, in FIG. 30, the X direction represents a length direction, the Y direction represents a width direction. In practical use, the outer housing 11B is fixed to a wall, and the first wheel 121B and the second wheel 122B are arranged on a side of the outer housing 11B facing away from the wall. The pulling rope 2 is sequentially wound around the first wheel 121B and the second wheel 122B, and meshes with the driven wheel 1. Since the first wheel 121B can move along the width direction of the outer housing 11B, a length of the pulling rope 2 wound around the first wheel 121B and the second wheel 122B can be adjusted by movement of the first wheel 121B. When the pulling rope 2 is subjected to force, which causes its circumference to increase, the pulling rope 2 naturally falls under its own weight and disengages from the driven wheel 1; at this time, the first wheel 121B can be driven to move by the driving structure 13B, and the first wheel 121B tightens the pulling rope 2. Specifically, the first wheel 121B moves towards a direction away from the second wheel 122B, which makes the length of the pulling rope 2 wound around the first wheel 121B and the second wheel 122B become longer. In this way, a distance between the pulling rope 2 and the driven wheel 1 is shortened, and the pulling rope 2 meshes with the driven wheel 1 again, so that the driven wheel 1 can drive the pulling rope 2 to rotate and achieve the normal opening and closing function of the electric curtain.

[0159] Compared with the existing technology, the tension adjusting device 1B of the present application drives the first wheel 121B to move through the driving structure 13B, so as to adjust the length of the pulling rope 2 wound around the first wheel 121B and the second wheel 122B, thereby playing the role of tensioning the pulling rope 2 and preventing the circumference of the pulling rope 2 from becoming longer and detaching from the driven wheel 1. The electric curtain using this tension adjusting device 1B is simpler in structure, and the tension adjusting device 1B and the power member 3B are independent of each other, their mounting and maintenance do not interfere with each other, thereby simplifying the overall structure of the electric curtain and facilitating assembly. At the same time, the tension adjusting device 1B prevents the pulling rope 2 from detaching from the power member 3B, thereby ensuring the normal opening and closing function of the electric curtain.

[0160] Referring to FIG. 30 again, the number of second wheel 122B can be multiple; along a length direction of the outer housing 11B, the multiple second wheels 122B are respectively arranged at both two sides of the first wheel 121B; furthermore, in an initial state, along a width direction of the outer housing 11B, the multiple second wheels 122B are arranged at the same side of the first wheel 121B.

[0161] The number of the second wheel 122B is at least one. In an embodiment, the number of second wheel 122B is further set to be multiple, and the multiple second wheels 122B are respectively arranged at two sides of the first wheel 121B along the length direction, so that the first wheel 121B is located among the multiple second wheels 122B, the length of the pulling rope 2 wound between the first wheel 121B and the second wheel 122B is longer, so the length of the pulling rope 2 that can be adjusted by the tension adjusting device 1B is also larger. Moreover, when the driving structure 13B drives the first wheel 121B to move, the second wheels 122B located on both sides of the first wheel 121B are wound with the pulling rope 2. The movement of the first wheel 121B can adjust the length of the pulling rope 2 on both sides thereof, so that the pulling ropes 2 can be tightened faster. Furthermore, the multiple second wheels 122B are located on the same side of the first wheel 121B along the width direction, which enhances the tension force of the first wheel 121B on the pulling rope 2, thereby shortening the time for the tension adjusting device 1B to tension the pulling rope 2 and enhancing the convenience of use.

[0162] As a preferred embodiment, the multiple second wheels 122B can be symmetrically arranged at two sides of the first wheel 121B along the length direction, and the multiple second wheels 122B are located at the same straight line along the length direction, so that the tension force degrees of the first wheel 121B on the pulling rope 2 at two sides thereof are consistent, and the force applied on the pulling rope 2 is more balanced.

[0163] Referring to FIG. 31, in FIG. 31, the X direction represents the length direction, the Y direction represents the width direction. The length direction and the width direction defines a first plane. A projection center of the first wheel 121B on the first plane is a first center, projection centers of the multiple second wheels 122B on the first plane are second centers, along the length direction, an included angle between connection lines from the first center to the second centers at two sides thereof is ; when the first wheel 121B moves along the width direction of the outer housing 11B, 160<<250.

[0164] It should be noted that in the initial state, that is, when the length of the pulling rope 2 is not stretched, the pulling rope 2 and the driven wheel 1 are in a meshing state, and the tension adjusting device 1B does not need to tension the pulling rope 2 at this time. Based on this, on the first plane, the included angle between connection lines from the first center to the second centers at two sides thereof is set between 160 and 250. In this way, when the driving structure 13B drives the first wheel 121B to move, the first wheel 121B can move to a position where the included angle between the connection lines is close to 180. At this position, the first wheel 121B and the second wheels 122B on both sides thereof are approximately on the same straight line. In this way, the pulling rope 2 can just contact the first wheel 121B and the second wheels 122B, and will not be tensioned by the first wheel 121B and the second wheels 122B. At this time, the pulling rope 2 is in a natural hanging state, thereby avoiding the tension adjusting device 1B from affecting the normal operation of the pulling rope 2 in the initial state. Moreover, when it is necessary to tighten the pulling rope 2, a user can directly drive the first wheel 121B to move through the driving structure 13B, thereby achieving the function of tightening the pulling rope 2 and making the operation be more convenient.

[0165] It can be understood that in some other embodiments, the included angle can also be set to be values in other ranges to achieve the aforesaid functions, the present application does not limit this.

[0166] In an embodiment, a diameter of the first wheel 121B is greater than a diameter of the second wheel 122B. The first wheel 121B with the greater diameter allows the length of the pulling rope 2 wound around the first wheel 121B to be longer, thereby enabling the first wheel 121B to tighten the pulling rope 2 faster when moving, and improving the tension efficiency of the tension adjusting device 1B.

[0167] Referring to FIG. 32, an outer side of the first wheel 121B can recess inward to form a first limiting slot 1213B. When the pulling rope 2 is wound around the first wheel 121B, the pulling rope 2 is located in the first limiting slot 1213B, the first limiting slot 1213B provides limiting function for the pulling rope 2 to limit movement of the pulling rope 2 and prevent the pulling rope 2 from detaching from the first limiting slot 1213B during movement and thereby causing the pulling rope 2 to detach from the first wheel 121B.

[0168] Similarly, an outer side of the second wheel 122B can also recess inward to form a second limiting slot 1223B. When the pulling rope 2 is wound around the second wheel 122B, the pulling rope 2 is located in the second limiting slot 1223B, the second limiting slot 1223B provides limiting function for the pulling rope 2 to prevent the pulling rope 2 from detaching from the second limiting slot 1223B during movement and thereby causing the pulling rope 2 to detach from the second wheel 122B. By the limiting function of the first limiting slot 1213B and the second limiting slot 1223B for the pulling rope 2, the pulling rope 2 is prevented from detaching from the first wheel 121B and the second 122B, thereby avoiding affecting the tension function of the tension adjusting device 1B for the pulling rope 2.

[0169] Referring to FIG. 32 again, the first wheel 121B includes a first limiting part 1211B and a first roller part 1212B, the first roller part 1212B is connected to the outer housing 11B, the first limiting part 1211B is connected to the top of the first roller part 1212B, and a projection of the first limiting part 1211B on the first plane covers a projection of the first roller 1212B part on the first plane.

[0170] Specifically, the first roller part 1212B can be provided with the first limiting slot 1213B, and the pulling rope 2 is wound around the first roller part 1212B and located inside the first limiting slot 1213B. A cross-section of the first limiting part 1211B is larger than a cross-section of the first roller part 1212B, and the first limiting part 1211B is located at the top of the first roller part 1212B. In this way, the first limiting part 1211B plays a limiting role on the pulling rope 2 to prevent the pulling rope 2 from coming out of the top of the first wheel 121B, and further limits the detachment of the pulling rope 2 from the first wheel 121B.

[0171] In an embodiment, the second wheel 122B can also include a second limiting part 1221B and a second roller part 1222B, the second limiting part 1221B is connected to the outer housing 11B, and the second limiting part 1221B is connected to the top of the second roller part 1222B; a projection of the second limiting part 1221B on the first plane covers a projection of the second roller part 1222B on the first plane. Specifically, the second roller part 1222B can be provided with the second limiting slot 1223B, and the pulling rope 2 is wound around the second roller part 1222B and located inside the second limiting slot 1223B. A cross-section of the second limiting part 1221B is larger than a cross-section of the second roller part 1222B, and the second limiting part 1221B is located at the top of the second roller part 1222B. In this way, the second limiting part 1221B plays a limiting role on the pulling rope 2 to prevent the pulling rope 2 from coming out of the top of the second wheel 122B, and further limits the detachment of the pulling rope 2 from the second wheel 122B.

[0172] Referring to FIG. 32 and FIG. 33, the tension structure 12B further includes a first fixing post 123B corresponding to the first wheel 121B and at least one second post 124B corresponding to the second wheel 122B. In this embodiment, the tension structure 12B can include multiple second fixing posts 124B corresponding to the multiple second wheels 122B, the first fixing post 123B is movably connected to the outer housing 11B and is connected to the driving structure 13B, the second fixing posts 124B are connected to the outer housing 11B; the first wheel 121B is sleeved on the first fixing post 123B, and the second wheels 122B are sleeved on the second fixing posts 124B; the first wheel 121B rotatably cooperates with the first fixing post 123B, and the second wheels 122B rotatably cooperate with the second fixing post 124B.

[0173] In an embodiment, the first fixing post 123B is movably connected to the outer housing 11B, and the driving structure 13B drives the first fixing post 123B to move along the width direction of the outer housing 11B. As the first wheel 121B is sleeved on the first fixing post 123B, the first fixing post 123B drives the first wheel 121B to move along the width direction of the outer housing 11B to achieve the function of tensioning the pulling rope 2. The second fixing posts 124B are fixedly connected to the outer housing 11B, and the second wheels 122B are sleeved on the second fixing posts 124B to achieve the connection between the second wheels 122B and the outer housing 11B through the second fixing posts 124B. Moreover, the first wheel 121B rotatably cooperates with the first fixing post 123B, and the second wheels 122B rotatably cooperate with the second fixing posts 124B; that is to say, all of the first wheel 121B and the second wheels 122B can rotate relative to the outer housing 11B. In this way, when the power member 3B is set to drive the pulling rope 2 to rotate, the rotatable first wheel 121B and second wheels 122B play a role in assisting the pulling rope 2 to rotate, thereby making the pulling rope 2 move more smoothly.

[0174] Referring to FIG. 32 again, the tension structure 12B includes a first fixing member 125B and at least one second fixing member 126B; in this embodiment, the tension structure 12B can include multiple second fixing members 126B, the first fixing member 125B is connected to the first fixing post 123B and located at the top of the first wheel 121B, and the first fixing member 125B is configured to axially limit the first wheel 121B; the second fixing members 126B are connected to the second fixing posts 124B and located at the tops of the second wheels 122B, and the second fixing members 126B are configured to axially limit the second wheels 122B.

[0175] In order to prevent the first wheel 121B and the second wheels 122B detaching from the outer housing 11B, the present application provides the first fixing member 125B and the second fixing members 126B. An end of the first fixing member 125B is inserted in the first fixing post123B and connected to the first fixing post 123B, and another end extends from the first fixing post 123B to abut against the first wheel 121B. The first fixing member 125B restricts the detachment of the first wheel 121B from the first fixing post 123B, thereby preventing the first wheel 121B from detaching from the outer housing 11B. An end of each second fixing member 126B is inserted in one of the second fixing posts 124B and connected to second fixing post 124B, and another end extends out of the second fixing post 124B to abut against one of the second wheels 122B. The second fixing members 126B restricts the detachment of the second wheels 122B from the second fixing posts 124B, thereby preventing the second wheels 122B from detaching from the outer housing 11B. By the limiting effect of the first fixing member125B and the second fixing members 126B, it is possible to effectively prevent the first wheel 121B and the second wheels 122B from detaching from the outer housing 11B, thereby enhancing the stability of using the tension adjusting device 1B.

[0176] Among them, the first fixing member 125B and the second fixing members 126B can adopt screw bolts or rivets.

[0177] It can be understood that since the diameter of the first wheel 121B is greater, a shim 127B can be arranged between the first fixing member 125B and the first wheel 121B. The first fixing member 125B restricts the first wheel 121B from detaching from the first fixing post 123B through the shim 127B. This arrangement can use the first fixing member 125B with a smaller size to save cost.

[0178] Referring to FIG. 32 again, the driving structure 13B includes a rotation member 131B, the rotation member 131B is rotatably connected to the outer housing 11B. The outer housing 11B is provided with a moving slot 113B along its width direction. The tension structure 12B is slidably connected to the moving slot 113B and connected with the rotation member 131B by thread.

[0179] In an embodiment, the driving structure 13B of the present application uses the rotation member 131B to drive the first wheel 121B to move. By rotating the rotation member 131B, the first wheel 121B is driven to move relative to the outer housing 11B. The rotation member 131B can be manually driven, which can accurately adjust a travel distance of the first wheel 121B and thus adjust the tightness degree of the pulling rope 2 more accurately.

[0180] It can be understood that in some other embodiments, the driving structure 13B can also adopt other manners, such as electric telescopic rods, which are not limited in the present application.

[0181] The driving structure 13B further includes a limiting member 133B, the limiting member 133B is arranged at an end of the rotation member 131B and configured to abut against the outer surface of the outer housing 11B to prevent the rotation member 131B from separating from the outer housing 11B.

[0182] Specifically, the first fixing post 123B is slidably connected to the moving slot 113B and connected with the rotation member 131B by thread. The first wheel 121B is sleeved on the first fixing post 123B. Among them, when the rotation member 131B rotates, the rotation member 131B drives the first wheel 121B to move along the width direction of the outer housing 11B. By rotating the the rotation member 131B, the first fixing post 123B is driven to slide along the moving slot 113B, and then the first fixing post 123B drives the first wheel 121B to slide along the moving slot 113B, thereby achieving the effect of tensioning the pulling rope 2.

[0183] Referring to FIG. 34, the driving structure 13B further includes an operation member 132B, an end of the rotation member 131B extends from the outer housing 11B and is connected with the operation member 132B, and another end of the rotation member 131B is rotatably connected to the outer housing 11B. The operation member 132B is used for gripping. In practical use, a cross-sectional area of the operation member 132B is larger than a cross-sectional area of the rotation member 131B. Users hold the operation member 132B and drives the rotation member 131B to rotate by rotating the operation member 132B. The operation member 132B provides a position convenient for users to hold and apply force.

[0184] In an embodiment, an outer surface of the operation member 132B is provided with multiple anti-slip parts 1321B along its circumference. The anti-slip parts 1321B play a role in anti-slip to increase the friction force for users to rotate the operation member 132B and prevent slipping, thereby facilitating users to rotate the operation member 132B and thus drive the rotation member 131B to rotate.

[0185] Referring to FIG. 34 again, the outer housing 11B includes a first housing 111B and a second housing 112B. The first housing 111B is detachably connected with the second housing 112B. The first wheel 121B is movably connected to the second housing 112B, and the second wheels 122B are connected to the second housing 112B. The first housing 111B is configured to connect with a wall. Among them, a length of the first housing 111B is greater than a length of the second housing 112B, and/or a width of the first housing 111B is greater than a width of the second housing 112B.

[0186] In an embodiment, the first housing 111B is configured to fixedly connect with a wall, and the second housing 112B is configured for connection with the first wheel 121B and the second wheels 122B. On the first plane, a projection area of the second housing 112B is set to be smaller than a projection area of the first housing 111B, which is beneficial for mounting of the first shell 111B with the wall on one hand, and reduces the overall design size of the outer housing 11B by reducing the size of the second housing 112B on the other hand, thereby saving design cost.

[0187] It can be understood that the first housing 111B and the second housing 112B can be detachably connected using screw bolts and the like, this arrangement is convenient for repairing and mounting.

[0188] Differing from the existing technology, the embodiment of the present application provides an electric curtain, such as an electric window curtain, and the tension adjusting device 1B thereof. The tension adjusting device 1B includes the outer housing 11B, the tension structure 12B, and the driving structure 13B; the outer housing 11B is configured to fixed to a wall; the tension structure 12B includes the first wheel 121B and the second wheel 122B, wherein the first wheel 121B is movably connected to the outer housing 11B, the second wheel 122B is connected to the outer housing 11B, the first wheel 121B and the second wheel 122B are sequentially arranged along the length direction of the outer housing 11B, and the first wheel 121B and the second wheel 122B are configured for winding the pulling rope 2; the driving structure 13B is connected to the first wheel 121B, and the driving structure 13B is configured to drive the first wheel 121B to move along a width direction of the outer housing 11B. Compared with the existing technology, the tension adjusting device 1B of the present application drives the first wheel 121B to move through the driving structure 13B, so as to adjust the length of the pulling rope 2 wound around the first wheel 121B and the second wheel 122B, thereby playing the role of tensioning the pulling rope 2 and preventing the circumference of the pulling rope 2 from becoming longer and detaching from the driven wheel 1. When the electric curtain using this tension adjusting device 1B is used, the power member 3B and the tension adjusting device 1B are independent of each other, their mounting and maintenance do not interfere with each other, thereby simplifying the overall structure of the electric curtain and facilitating assembly. At the same time, the tension adjusting device 1B prevents the pulling rope 2 from detaching from the power member 3B, thereby ensuring the normal opening and closing function of the electric curtain.

[0189] The above are only specific embodiments of the present application, the protection scope of the present application is not limited here. Any change or replacement that can be easily considered by technicians familiar with this technical field within the technical scope disclosed by the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the appended claims.