OUTER ROTOR MOTOR DIRECT-DRIVE DRILLING OR MILLING MACHINE

Abstract

An outer rotor motor direct-drive drilling or milling machine, including a machine base, a frame, a mechanical driving component and an electrical control box component. The frame is installed on the machine base, a mechanical transmission box component is installed on the frame, the electrical control box component is located on the top of the frame. A mechanical driving component includes an mechanical execution component and a lifting mechanism, the mechanical execution component is composed of a hollow shaft outer rotor motor and an output shaft assembly. The output shaft of the output shaft assembly and the hollow shaft of the outer rotor motor are fitted in the form of a key or a spline. This form of cooperation chooses the fit forms that can transmit the speed and torque of the motor and can move the output shaft axially.

Claims

1. An outer rotor motor direct-drive drilling or milling machine, comprising a machine base, a frame, a mechanical driving component and an electrical control box component; the frame is installed on the machine base, a mechanical transmission box component is installed on the frame, the electrical control box component is located on a top of the frame; the mechanical driving component comprises an mechanical execution component and a lifting mechanism, wherein the mechanical execution component is composed of a hollow shaft outer rotor motor and an output shaft assembly; an output shaft of the output shaft assembly and a hollow shaft of the outer rotor motor are fitted in a form of a key or a spline, wherein the fit form chooses a fit form that transmits a speed and a torque of the motor and drives the output shaft to move axially; an other end of the output shaft assembly is equipped with a drill chuck, and a guide rail rack pushing rod of the lifting mechanism is connected to a pressing sleeve in a middle of the output shaft to drive the output shaft assembly to move axially up and down; the mechanical driving component and the electrical control box are both arranged on the top of the frame of the drilling machine or milling machine, the motor and the electrical control box are wrapped by a shell an air outlet is arranged at the blade facing the top of the motor, and an air inlet is arranged at an end of the electrical control box; the outer rotor motor, the electrical control box and the mechanical transmission box are internally communicated to form an air flow channel, cold air enters from the air inlet by rotating of the blade of the outer rotor motor; the cold air passes through the air flow channel, and then is discharged from the air outlet to form a cooling system, and the outer rotor motor, the electrical control box and the mechanical transmission box are internally cooled at the same time.

2. The outer rotor motor direct-drive drilling or milling machine according to claim 1, wherein the hollow shaft of the the hollow shaft outer rotor motor is connected to the output shaft of the driving output assembly by a key or a spline, and the output shaft of the driving output assembly is connected to the stator bracket of the hollow shaft outer rotor motor by a bearing.

3. The outer rotor motor direct-drive drilling or milling machine according to claim 1, wherein the hollow shaft outer rotor motor uses an axial-flow blade or a centrifugal blade, and the axial-flow blade or the centrifugal blade is separated or integrally formed with a housing of the hollow shaft outer rotor motor.

4. The outer rotor motor direct-drive drilling or milling machine according to claim 1, wherein a spiral steel belt protective sleeve is used between the output shaft assembly and the outer rotor motor.

5. The outer rotor motor direct-drive drilling or milling machine according to claim 1, wherein the lifting mechanism comprises a pressing sleeve and a driving gear, the pressing sleeve is connected to the output shaft by a deep groove ball bearing and a thrust ball bearing, the pressing sleeve is fixedly connected to outer rings of the deep groove ball bearing and the thrust bearing, a lower portion of the pressing sleeve is locked with a looking bolt, and the driving gear acts on the pressing sleeve by a guide rail rack pushing rod.

6. The outer rotor motor direct-drive drilling or milling machine according to claim 5, wherein the driving gear is arranged on a shaft of a rotating handle, the driving gear of the rotating handle acts on a rack part of the guide rail rack pushing rod, the guide rail rack pushing rod is connected to the pressing sleeve to drive the output shaft assembly to move up and down.

7. The outer rotor motor direct-drive drilling or milling machine according to claim 5, wherein a positioning and looking bolt passes through the guide rail bracket horizontally and constructs a thread pair with the guide rail bracket; the positioning and looking bolt is rotated to fasten or loose a guide rail side surface of the guide rail rack pushing rod till the guide rail rack pushing rod is locked or loosen.

8. The outer rotor motor direct-drive drilling or milling machine according to claim 5, wherein a guide rail bracket is arranged on the pressing sleeve, a guide rail rack pushing rod is arranged on the guide rail bracket, and a space for placing sensor is provided between the guide rail bracket and the guide rail rack pushing rod; the guide rail rack pushing rod is matched with the driving gear on the rotating handle; the rotating handle is rotated to make the guide rail rack pushing rod drive the pressing sleeve, then the output shaft is driven to move up and down; the positioning and looking bolt passes through the guide rail bracket horizontally and is pushed on the guide rail rack pushing rod.

9. The outer rotor motor direct-drive drilling or milling machine according to claim 1, wherein the mechanical transmission box and the electrical control box are two relatively independent parts, a box portion of the electrical control box is made of insulating materials, and all live components are assembled in the insulating box portion; two groups of wires enter the mechanical control box, which are motor drive and signal acquisition line groups and displacement sensor power and signal line group.

10. (canceled)

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1 is a schematic diagram showing a output shaft structure in prior art.

[0023] FIG. 2 is a schematic diagram showing the overall appearance of the present disclosure.

[0024] FIG. 3 is a cross-sectional view of a portion of an internal mechanical structure.

[0025] FIG. 4 is a connection diagram of a motor and an output shaft.

[0026] FIG. 5 is a longitudinal sectional connection diagram of the motor and the output shaft.

[0027] FIG. 6 is a schematic diagram of a rotor bracket.

[0028] FIG. 7 is a connection relationship diagram of the output shaft, a pressing sleeve, and a drill.

[0029] FIG. 8a is a connection relationship diagram of the pressing sleeve and a lifting mechanism.

[0030] FIG. 8b is a cross-sectional view taken along the line A-A of FIG. 8a.

[0031] FIG. 9 is a connection diagram of a positioning and locking mechanism.

[0032] FIG. 10 is a diagram showing the equipment air circulation.

[0033] 1. frame; 2. sleeve; 3. rack guide; 4. bearing ax2; 5. bearing bx2; 6. belt pulley; 7. swivel sleeve; 8. output shaft; 9. advancing gear assembly; 10. drill chuck; 11. electrical control box component; 12. mechanical driving component; 13. positioning and locking mechanism; 14. rotating handle; 15. air outlet; 16 air inlet; 21. box assembly; 22. hollow shaft outer rotor motor, 23. output shaft; 24. locking and advancing (retracting) knife mechanism assembly, 25. power box lifting mechanism assembly (small drilling and milling machine can be omitted); 30. integrated blade; 31. stator bracket; 32. rotor bracket; 33. magnetic steel; 34. hollow shaft; 35. stator assembly; 36. bearing 1; 37. seal ring; 38. gasket; 39. bearing 2; 310 retaining ring, 31A hollow shaft sleeve; 31B rotor bracket; 42. locking nut; 43. retaining ring for hole; 44. deep groove ball bearing; 45. thrust ball bearing; 46. pressing sleeve; 47. retaining ring for shaft; 48. spiral steel belt protective sleeve; 51. guide rail bracket; 52. guide rail fixing screw; 53. position sensor, 54 pressing plate and screw; 55. guide rail rack pushing rod; 56. driving gear; 57 locking mechanism; 58. pre-tensioned torsion spring; 59. shaft 50. handle assembly; 511. shoulder screw; 61. screw; 62. retaining ring for shaft; 63. sliding button; 64. spring pin.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] In order to further illustrate the features of the present disclosure, the following is further described with reference to the accompanying drawings. As shown in the figures, an outer rotor motor direct-drive drilling machine or milling machine includes a machine base, a frame 1, and a mechanical driving component 12 and electrical control box component 11. The frame is installed on the machine base, a mechanical driving component is installed on the frame, the electrical control box component is located on the top of the frame, the mechanical driving component includes a execution mechanism and a lifting mechanism. The frame is composed of a traditional base assembly, a workbench assembly, a lifting rack (small drilling and milling machines can omitted the lifting rack), a riser and so on, this part can refer to the standard design.

[0035] Design and disclosure principle of mechanical driving component:

The mechanical driving component is mainly composed of the following parts:

[0036] 1. Box assembly: the box assembly is composed of box and locking mechanism (locked with the riser of frame). The position of the box on the frame is determined by using the elastic deformation of the junction of the box and the riser of frame and locking with bolts. The box can be made of metal or non-metal materials according to the motor size and mechanical strength requirements.

[0037] 2. FIG. 4 and FIG. 5 are longitudinal sectional and cross sectional views of the hollow shaft outer rotor motor, showing the relationship with the output shaft. Most of the components are components of the traditional outer rotor motor, which will not be introduced here. It is specially pointed out that the hollow shaft outer rotor motor is the patent of our company (patent name: outer rotor motor, patent No.: 201820577986.2, inventor: Zheng ZhiYing, Zheng Xiaofei): the rotor shaft of the outer rotor motor is made into a hollow shaft (also known as the guide sleeve). The speed and torque of the motor are transmitted to the output shaft 23 by the key (flat key, semicircle key, ball key) or spline (rectangular spline, involute spline), and the output shaft assembly performs the processing task. According to the requirements of accuracy and strength, the inner hole of the hollow shaft can be made into various forms to meet the transmission torque and speed and to allow the axial movement of the output shaft 23.

[0038] The diameter of the hollow shaft must meet two requirements at the same time: first, the design of the middle hole of the stator core must meet the requirements of the magnetic field density of the motor, second, the output shaft must meet the requirements of the strength.

[0039] The middle hollow shaft of the hollow shaft outer rotor motor is connected to the output shaft of the driving output shaft assembly by a key or spline, and the output shaft of the driving output shaft assembly and the stator of the hollow shaft outer rotor motor are connected by a bearing.

[0040] Hollow shaft motor blades 31A can be made into two modes as centrifugal blade and axial-flow blade. The axial-flow blade is shown in the figure. This kind of axial-flow blade is integrally formed with a rotor bracket 31B. If the rotor bracket is metal stamping, the blades can be directly stamped, and the large motor can be cast. The purpose of this design is to reduce volume, weight and process cost. The number of blades depends on the size of the motor, but at least not less than 2. The rotor bracket is formed by stamping or casting.

[0041] The hollow shaft motor is fixed on the box by screws, and its power line is connected with the driving power output from the electrical control box by a connector to obtain the driving power and to output the motor rotation signal.

[0042] 3. Output shaft assembly: the output shaft assembly obtains the speed and torque (power) applied by the motor rotor and the axial force applied by the guide rail rack pushing rod 55 in the locking and advancing (retracting) mechanism to the pressing sleeve 46 by the shoulder screw, so that the output shaft assembly 23 obtains the rotary motion and the reciprocating linear motion. The thrust ball bearing 44 and the deep groove ball bearing 45 are combined by a retaining ring for shaft 47 and are positioned by a retaining ring for hole 43, and the nut 42 is used for locking, the axial force and the radial force in the process of drilling (or milling) are eliminated respectively.

[0043] It is specially pointed out that this design uses the spiral steel belt protective sleeve 48. the spiral steel belt protective sleeve 48 has the function of waterproof and dustproof, and has certain axial force of expanding and contracting, which can reduce cutting vibration and improve the processing quality.

[0044] 4. As shown in FIG. 8a, a locking and advancing (retracting) knife mechanism assembly is composed of a sliding pair consisting of a guide rail bracket 51 and a guide rail rack pushing rod 55 and a gear pair consisting of a guide rail rack pushing rod 55 and a gear 56, and a guide rail bracket 51 is fixed on the box by a screw 52. According to the accuracy requirements, different types of sliding pairs can be selected, and the rectangular guide rail is selected as shown in the figure. The guide rail rack pushing rod 55 is connected to the pressing sleeve 46 in the output shaft assembly by the screw 54, and the pressing sleeve is connected to the deep groove ball bearing by the shoulder screw 511. When the guide rack pushing rod 55 is assembled at the top dead center, the torsion spring 58 connected to the shaft 59 is pre-tightened, and the position of the torsion spring is locked by tightening the nut 57, so that the output shaft assembly driven by the guide rack pushing rod is always at the top dead center position, and the gear and handle assembly 50 are fixed on the shaft 59. When the handle assembly 50 is rotated, the guide rack pushing rod can be driven to move downward, so that the output shaft assembly can obtain the downward movement and complete the cutting when the output shaft assembly is rotated.

[0045] See FIG. 8b, in order to obtain clear and accurate drilling depth and tool setting depth for the user, a displacement sensor 24 is placed between the guide rail bracket and the guide rail rack pushing rod, and a moving block on the displacement sensor is fixed on the guide rail rack pushing rod 55 by a pressing plate and a screw. The displacement signal can be output when the guide rail rack pushing rod is moved, and the user can read out the relative displacement and absolute displacement values from the display screen. Of course, the selection may not be necessary to install a displacement sensor.

[0046] See FIG. 9, in consideration of the need to fix the position of the milling cutter when the user has milling requirements, the locking mechanism is designed. The principle is to add a locking mechanism on the joint surface of the guide rail bracket 51 and the guide rail rack pushing rod 55. One end of the screw 61 is slotted to put into the sliding button 63, which is fixed by the spring pin 64 and supported by the box. First, the thread part is pre-screwed into the guide rail bracket 51 during assembly, do not tighten the guide rail rack pushing rod, and the spring retainer 62 is installed to limit the position. When the machine tool is used for drilling, the screw 61 is in a loose state, and the guide rail rack pushing rod can move up and down to complete the drilling work. When the machine tool is used for milling, the tool setting position is adjusted, that is, tightening the screw, locking the guide rail rack pushing rod, so that the pushing rod is in a static state which can use to mill a plane or a groove.

[0047] The lifting mechanism assembly (small drilling and milling machine may not used it), etc.

[0048] Electrical control box component (this part relates to the prior art, and can be designed according to the actual situation): the box is made of non-metallic insulating materials, and the display operation panel assembly, control system assembly (PCB), driving power supply, switches, etc. are assembled in it, so that the live parts or components are strictly separated from the mechanical transmission box component, and the motor driving power line is connected to the motor in the mechanical transmission box. The position sensor is a low-voltage component, and the low-voltage power supply is provided in the electrical control box, and the position signal is collected. The electrical components here are all available to those in the art.

[0049] The design and layout idea of separating the electrical control box component and the mechanical driving component are as follows: 1. The motor driving system and the control system and the mechanical transmission system belong to two different manufacturing units. In the coordination process, only one socket can drive the motor and collect the motor motion signal. In addition, the displacement sensor belongs to the low-voltage component, and only one socket can realize the displacement signal transmission; 2. All other high and low voltage components are integrated and assembled in the box made of insulating materials, which improves the safety performance; 3. It is easy to realize automatic production.

[0050] 2. The cooling system principle of the present disclosure is shown in FIG. 10:

[0051] Under the action of the blade of the motor, the cold air enters an air inlet 16 from the rear of the electrical control box. First, the electronic components (PCB), switches, capacitors, etc. will be cooled down, then the air outlet 15 of the electrical control box will lead the cold air into the mechanical transmission box (refer to FIG. 6) and enter into the interior of the motor, and then discharge put of the machine under the action of the blade.

[0052] As described above, the outer rotor motor is designed as a hollow shaft (guide sleeve) and has an axial guidance function, and another output shaft 23 is arranged to receive the rotation and torque of the motor, and can move axially in the hollow shaft. The output shaft 23 has a mechanism to undertake the axial force of the guide rail rack pushing rod 55 to realize the up and down axial movement, so that the drill bit (or milling cutter) clamped by the drill chuck installed on the output shaft can complete the drilling and milling work.

[0053] The present disclosure highly integrates of a rack lifting mechanism 25, a position sensor 24 (if necessary), a lifting and locking mechanism, a driving gear mechanism and a driving gear reset mechanism together, which has advantages in small use space, simple manufacturing. And the output shaft is not affected by radial force when working, so that the machining accuracy and service life of the drilling (milling) machine is enhanced. It greatly reduces the volume and weight of the machine tool.

[0054] Compared with the traditional drilling or milling machine, the direct-drive drilling or milling machine of the outer rotor motor completely changes the transmission mode, so that the motor power is used to the maximum extent, the reactive power loss is reduced, so as to realize energy saving and environmental protection.

[0055] The present disclosure applies the principle that the brushless motor can be digital control to achieve accurate stepless speed regulation and energy compensation of the motor. The visualization of the speed and advancement value greatly reduces the operation intensity and enables the operator to work easily and pleasantly.