ABRASIVE BELT GRINDING DEVICE FOR PROFILE PRECISION CONSISTENCY

Abstract

An abrasive belt grinding device is provided, a supporting plate passes through an inner cylinder, and is fixed to the inner cylinder, the inner cylinder is rotatably connected to an outer cylinder bracket, a winding reel and an unwinding reel are arranged side by side in a left-right direction at an upper end of the supporting plate, and are driven by respective first servo motors, one end of the abrasive belt is wound in a belt groove of the winding reel, and another end of the abrasive belt is wound over the first transition wheel, the first tension pulley, the third transition wheel, the fifth transition wheel, the seventh transition wheel, the contact wheel, the eighth transition wheel, the sixth transition wheel, the fourth transition wheel, the second tension pulley, and the second transition wheel, and is finally wound in a belt groove of the unwinding reel.

Claims

1. An abrasive belt grinding device for profile precision consistency, wherein a supporting plate passes through an inner cylinder, and is fixed to the inner cylinder, the inner cylinder is rotatably connected to an outer cylinder bracket, a winding reel and an unwinding reel are arranged side by side in a left-right direction at an upper end of the supporting plate, and are driven by respective first servo motors arranged corresponding to the winding reel and the unwinding reel; a first transition wheel and a second transition wheel are arranged side by side in the left-right direction at an upper portion of the supporting plate, and a first tension pulley and a second tension pulley are arranged side by side in the left-right direction at a middle lower portion of the supporting plate, and a third transition wheel and a fourth transition wheel are arranged side by side in the left-right direction at a lower end of the supporting plate, a fifth transition wheel is arranged at the lower left of the third transition wheel, a seventh transition wheel is arranged at the lower right of the third transition wheel, a sixth transition wheel is arranged at the lower right of the fourth transition wheel, and an eighth transition wheel is arranged at the lower left of the fourth transition wheel, a contact rod is suspended at a bottom end of the supporting plate, and a contact wheel is installed at a lower end of the contact rod, and an abrasive belt has one end wound in a belt groove of the winding reel and another end wound over the first transition wheel, the first tension pulley, the third transition wheel, the fifth transition wheel the seventh transition wheel, the contact wheel, the eighth transition wheel, the sixth transition wheel, the fourth transition wheel, the second tension pulley and the second transition wheel, and finally wound in a belt groove of the unwinding reel.

2. The abrasive belt grinding device for profile precision consistency according to claim 1, wherein the winding reel and the unwinding reel have the same structure, and each comprises an inner disc and an outer disc, the inner disc and the outer disc are sleeved on a connecting shaft side by side, and a belt groove is formed between the inner disc and the outer disc; an inner end of the connecting shaft is sleeved on an output shaft of the respective first servo motor, and the inner end of the connecting shaft and the output shaft of the respective first servo motor are connected by a key, and a body of the first servo motor is fixed onto the supporting plate by a mounting base.

3. The abrasive belt grinding device for profile precision consistency according to claim 2, wherein a locking key is provided at an outer side of the outer disc, and the locking key is a rectangular block, the locking key passes through a fitting hole provided correspondingly in the connecting shaft, and the locking key is located in an elongated groove provided in the outer disc, and an elongated hole is further provided in the outer disc, and the elongated hole and the elongated groove intersect at right angles; a handle is provided at an outer side of the locking key, the handle is sleeved on an outer end of the connecting shaft, the handle is connected to the locking key by a bolt, a compression spring is sleeved on the bolt, and is located inside the connecting shaft, and the compression spring has one end abutting against the locking key and another end abutting against a spring seat embedded into the connecting shaft.

4. The abrasive belt grinding device for profile precision consistency according to claim 1, wherein the first tension pulley and the second tension pulley have a same mounting structure, the first tension pulley is sleeved on an axle by a bearing, and the axle is fixed to a lower end of a first connecting rod, and an upper end of the first connecting rod is connected to one end of a second connecting rod, the second connecting rod is perpendicular to the first connecting rod, and another end of the second connecting rod is connected to a through pin, the through pin passes through the supporting plate and is connected to a lower end of a tension spring, an upper end of the tension spring is connected to a fixing rod, and the fixing rod is fixed to the supporting plate.

5. The abrasive belt grinding device for profile precision consistency according to claim 1, wherein the inner cylinder is supported in an outer cylinder by a bearing, and the outer cylinder is fixed to the outer cylinder bracket, a second servo motor is mounted on the outer cylinder bracket, and a synchronous driving pulley is sleeved on an output shaft of the second servo motor, and the synchronous driving pulley is connected to a synchronous driven pulley sleeved on the inner cylinder by a synchronous toothed belt.

6. The abrasive belt grinding device for profile precision consistency according to claim 5, wherein the outer cylinder bracket is fixed to a grinding head supporting plate, and a third servo motor is mounted on the grinding head supporting plate, an output shaft of the third servo motor is connected to a gear shaft via a coupler, and the gear shaft is configured to roll in a circular arc-shaped sliding slot provided in a bed, a gear is provided on the gear shaft, and a circular arc-shaped rack configured to engage with the gear is provided on the bed.

7. The abrasive belt grinding device for profile precision consistency according to claim 2, wherein the inner cylinder is supported in an outer cylinder by a bearing, and the outer cylinder is fixed to the outer cylinder bracket, a second servo motor is mounted on the outer cylinder bracket, and a synchronous driving pulley is sleeved on an output shaft of the second servo motor, and the synchronous driving pulley is connected to a synchronous driven pulley sleeved on the inner cylinder by a synchronous toothed belt.

8. The abrasive belt grinding device for profile precision consistency according to claim 7, wherein the outer cylinder bracket is fixed to a grinding head supporting plate, and a third servo motor is mounted on the grinding head supporting plate, an output shaft of the third servo motor is connected to a gear shaft via a coupler, and the gear shaft is configured to roll in a circular arc-shaped sliding slot provided in a bed, a gear is provided on the gear shaft, and a circular arc-shaped rack configured to engage with the gear is provided on the bed.

9. The abrasive belt grinding device for profile precision consistency according to claim 3, wherein the inner cylinder is supported in an outer cylinder by a bearing, and the outer cylinder is fixed to the outer cylinder bracket, a second servo motor is mounted on the outer cylinder bracket, and a synchronous driving pulley is sleeved on an output shaft of the second servo motor, and the synchronous driving pulley is connected to a synchronous driven pulley sleeved on the inner cylinder by a synchronous toothed belt.

10. The abrasive belt grinding device for profile precision consistency according to claim 9, wherein the outer cylinder bracket is fixed to a grinding head supporting plate, and a third servo motor is mounted on the grinding head supporting plate, an output shaft of the third servo motor is connected to a gear shaft via a coupler, and the gear shaft is configured to roll in a circular arc-shaped sliding slot provided in a bed, a gear is provided on the gear shaft, and a circular arc-shaped rack configured to engage with the gear is provided on the bed.

11. The abrasive belt grinding device for profile precision consistency according to claim 4, wherein the inner cylinder is supported in an outer cylinder by a bearing, and the outer cylinder is fixed to the outer cylinder bracket, a second servo motor is mounted on the outer cylinder bracket, and a synchronous driving pulley is sleeved on an output shaft of the second servo motor, and the synchronous driving pulley is connected to a synchronous driven pulley sleeved on the inner cylinder by a synchronous toothed belt.

12. The abrasive belt grinding device for profile precision consistency according to claim 11, wherein the outer cylinder bracket is fixed to a grinding head supporting plate, and a third servo motor is mounted on the grinding head supporting plate, an output shaft of the third servo motor is connected to a gear shaft via a coupler, and the gear shaft is configured to roll in a circular arc-shaped sliding slot provided in a bed, a gear is provided on the gear shaft, and a circular arc-shaped rack configured to engage with the gear is provided on the bed.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 is a schematic view showing the structure of an embodiment of the present application.

[0022] FIG. 2 is a schematic view showing the structure and assembling of a reel.

[0023] FIG. 3 is a schematic view showing the structure of a tension pulley.

[0024] FIG. 4 is a schematic view of a driving structure of an inner cylinder.

[0025] FIG. 5 is a schematic view showing the driving of a grinding head supporting plate.

DETAILED DESCRIPTION

[0026] The present application is further described hereinafter with reference to the drawings and embodiments.

[0027] As shown in FIGS. 1, 2, and 4, a supporting plate 1 is preferably T-shaped, and passes through an inner cylinder 31, and the supporting plate 1 is fixed to the inner cylinder 31. A winding reel 2 and an unwinding reel 3 are arranged side by side in a left-right direction on an upper end of the supporting plate 1, and are distributed symmetrically with respect to the center line of the supporting plate 1, the winding reel 2 and the unwinding reel 3 are respectively driven by respective first servo motors 4 arranged corresponding to the winding reel 2 and the unwinding reel 3. The winding reel 2 and the unwinding reel 3 have the same structure, and each include an inner disc 19 and an outer disc 20. The inner disc 19 and the outer disc 20 are sleeved on a connecting shaft 21 side by side, and a belt groove is formed between the inner disc 19 and the outer disc 20. An inner end of the connecting shaft 21 is sleeved on an output shaft of the respective first servo motor 4, and the inner end of the connecting shaft 21 and the output shaft of the respective first servo motor 4 are connected by a key, and a body of the first servo motor 4 is fixed to the supporting plate 1 by a mounting base 5.

[0028] As shown in FIGS. 1 and 2, a locking key 22 is provided at an outer side of the outer disc 20, and the locking key 22 is embodied as a rectangular block. The locking key 22 is perpendicular to the connecting shaft 21, and the locking key 22 passes through a fitting hole provided correspondingly in the connecting shaft 21, and the shape of the fitting hole is adapted to a moving track of the locking key 22. Two ends of the locking key 22 are located in an elongated groove provided in the outer disc 20, and an elongated hole 20a is further provided in the outer disc 20, and the elongated hole 20a and the elongated groove intersect at right angles. A handle 23 is provided at an outer side of the locking key 22, the handle 23 is a hollow structure, and is idly sleeved on an outer end of the connecting shaft 21. The handle 23 is fixedly connected to a middle portion of the locking key 22 by a bolt 24 passing through the axis of the handle 23. A compression spring 25 is sleeved on the bolt 24, and is located inside the connecting shaft 21. The compression spring 25 has one end abutting against the locking key 22, and has another end abutting against a spring seat embedded into the connecting shaft 21. Under the action of the compression spring 25, the locking key 22 is embedded into the elongated groove in the outer disc 20, to fix the position of the outer disc 20. When it requires to remove the outer disc 20, the handle 23 is pulled first, to compress the compression spring 25, which allows the locking key 22 to be disengaged from the elongated groove in the outer disc 20, and then the handle 23 is rotated by 90 degrees, to allow the locking key 22 to be rotated by 90 degrees along with the handle 23 and to be placed in the elongated hole 20a of the outer disc 20, and in this case, the locking key 22 loses the function of positioning the outer disc 20, and the outer disc 20 can be remove to replace the abrasive belt.

[0029] As shown in FIGS. 1 and 3, a first transition wheel 6 and a second transition wheel 7 are arranged side by side in the left-right direction on an upper portion of the supporting plate 1, and the first transition wheel 6 and the second transition wheel 7 adjoin each other, and are distributed symmetrically with respect to the center line of the supporting plate 1. A first tension pulley 14 and a second tension pulley 15 are arranged side by side in the left-right direction at a middle lower portion of the supporting plate 1, and are distributed symmetrically with respect to the center line of the supporting plate 1. The first tension pulley 14 and the second tension pulley 15 have the same mounting structure, and in this embodiment, only the mounting structure of the first tension pulley 14 is described as an example. The first tension pulley 14 is sleeved on an axle 26 by a bearing, and the axle 26 is fixed to a lower end of a first connecting rod 27, and an upper end of the first connecting rod 27 is connected to one end of a second connecting rod 28. The second connecting rod 28 is perpendicular to the first connecting rod 27, and has another end connected to a through pin. The through pin passes through the supporting plate 1 and is connected to a lower end of a tension spring 29. An upper end of the tension spring 29 is connected to a fixing rod 30, and the fixing rod 30 is fixed to the supporting plate 1.

[0030] As shown in FIG. 1, a third transition wheel 8 and a fourth transition wheel 9 are arranged side by side in the left-right direction at a lower end of the supporting plate 1, and are distributed symmetrically with respect to the center line of the supporting plate 1. The distance between the third transition wheel 8 and the fourth transition wheel 9 is greater than the distance between the first tension pulley 14 and the second tension pulley 15. A fifth transition wheel 10 is arranged at the lower left of the third transition wheel 8, and a seventh transition wheel 12 is arranged at the lower right of the third transition wheel 8, a sixth transition wheel 11 is arranged at the lower right of the fourth transition wheel 9, and an eighth transition wheel 13 is arranged at the lower left of the fourth transition wheel 9. The fifth transition wheel 10 and the sixth transition wheel 11 are distributed symmetrically with respect to the center line of the supporting plate 1, and the seventh transition wheel 12 and the eighth transition wheel 13 are also distributed symmetrically with respect to the center line of the supporting plate 1, and the seventh transition wheel 12 is located at the lower right of the fifth transition wheel 10.

[0031] As shown in FIG. 1, a contact rod 16 is suspended at a bottom end of the supporting plate 1, and an upper end of the contact rod 16 is fixed to the supporting plate 1 by a screw, and a contact wheel 17 is installed at a lower end of the contact rod 16. The contact wheel 17 may be worn in different extents during the grinding process, and when the contact wheel 17 is scrap, the contact rod 16 may be conveniently detached to replace the contact wheel 17. In the grinding process, the contact wheels 17 having corresponding diameters are selected and replaced according to different curvatures of the surface, to be machined, of the workpiece. If the contact rod 16 cannot meet the assembling requirement of the contact wheel 17, it simply needs to change the dimension of a tail end of the contact rod 16 to re-select and then machine the contact rod 16.

[0032] As shown in FIGS. 1, 2, and 3, one end of the abrasive belt 18 is wound in the belt groove of the winding reel 2, and another end of the abrasive belt 18 is wound over the first transition wheel 6, the first tension pulley 14, the third transition wheel 8, the fifth transition wheel 10, the seventh transition wheel 12, the contact wheel 17, the eighth transition wheel 13, the sixth transition wheel 11, the fourth transition wheel 9, the second tension pulley 15, and the second transition wheel 7, and is finally wound in the belt groove of the unwinding reel 3. The first tension pulley 14 and the second tension pulley 15 are subjected to a tensile force of the abrasive belt 18, and the tension spring 29 is tensioned, to enable the two tension pulleys to move toward the middle to get close to each other, in this way, the tension pulleys have a buffer effect, and can avoid the breakage of the abrasive belt caused by a sudden variation of the tensile force of the abrasive belt.

[0033] As shown in FIGS. 1 and 2, the first servo motor configured to drive the winding reel 2 is a winding motor, and the first servo motor configured to drive the unwinding reel 3 is an unwinding motor. In the grinding process of the abrasive belt, the winding and unwinding method according to the present application is as follow.

[0034] A servo driver controls the winding motor to rotate forward, and the winding motor transmits power to the winding reel 2, to allow the winding reel 2 to rotate forward to wind the belt; meanwhile, a driver of the unwinding motor controls the unwinding motor to rotate forward, and the unwinding motor transmits power to the unwinding reel 3, to allow the unwinding reel 3 to rotate forward to unwind the belt. The tensile force of the abrasive belt 18 is adjusted by controlling the torque of the first servo motor, to ensure the precision and surface quality of the ground workpiece. In this device, the winding and unwinding of the winding reel depends on the rotating direction of the first servo motor and the direction of winding of the abrasive belt. For achieving a reciprocating grinding by the abrasive belt 18, when the belt is winded or unwound to a certain position, the winding motor rotates backward to drive the winding reel 2 to rotate backward, and the unwinding motor rotates backward to drive the unwinding reel 3 to rotate backward, thus the winding reel 2 is switched into a state for unwinding the belt, and the unwinding reel 3 is switched into a state for winding the belt, and the abrasive belt 18 grinds the workpiece in a reverse direction, and the above process is repeated, and this reciprocating manner allows grinding by a short abrasive belt 18.

[0035] A servo motor is employed to drive the winding reel 2 and the unwinding reel 3 directly, and the model selection of the servo motor may be varied. In the present application, the linear speed of the abrasive belt has a large adjustment range, which can meet the requirements for selecting different abrasive belt linear speeds in grinding and polishing process. To ensure that the abrasive belt has a constant linear speed, the rotating speed of the servo motor is determined by diameters of the abrasive belt coil of the winding reel 2 and the unwinding reel 3.

[0036] As shown in FIGS. 1 and 4, the inner cylinder 31 is supported in an outer cylinder by a bearing, and the outer cylinder is fixed to an outer cylinder bracket 32. A second servo motor 33 is mounted on the outer cylinder bracket 32, and a synchronous driving pulley 34 is sleeved on an output shaft of the second servo motor 33, and the synchronous driving pulley 34 is connected to a synchronous driven pulley sleeved on the inner cylinder 31 by a synchronous toothed belt 35. When the second servo motor 33 is started, the second servo motor 33 drives the synchronous driving pulley 34 to rotate, and the synchronous driving pulley 34 drives the synchronous driven pulley and the inner cylinder 31 to rotate together by the synchronous toothed belt 35, and the inner cylinder 31 correspondingly drives the mechanism on the supporting plate 1 to rotate, to achieve linkage between the inner cylinder 31 and other shafts of the machine tool, thereby performing machining of complex profiles.

[0037] As shown in FIGS. 4 and 5, the outer cylinder bracket 32 is fixed to a grinding head supporting plate 36, and a third servo motor is mounted on the grinding head supporting plate 36. An output shaft of the third servo motor is connected to a gear shaft 37 via a coupler, and the gear shaft 37 is capable of rolling in a circular arc-shaped sliding slot provided in a bed 40. A gear 38 is provided on the gear shaft 37, and a circular arc-shaped rack 39 configured to engage with the gear 38 is provided on the bed 40. The third servo motor drives the gear shaft 37, to allow the gear 38 to rotate with respect to the circular arc rack 39. The gear shaft 37 is fixedly connected to the grinding head supporting plate 36, and the rotations of the gear 38 and the gear shaft 37 drive the grinding head supporting plate 36 to rotate, and thus, the entire grinding head rotates with the grinding head supporting plate 36. In this way, the workpiece can be placed horizontally, thus facilitating the mounting and dismounting of the workpiece and reducing collision and wear of the workpiece. Further, the space can be saved, three grinding devices can be arranged on the left, the right and the rear of the workpiece, thus large members having multiple blades such as a blisk may be simultaneously machined at multiple stations, thus the machining efficiency can be significantly improved. With the gear engagement manner, the grinding head can sway at a large angle of 30 degrees, and can be adapted to the grinding of workpieces with a great surface curvature variation.

[0038] The preferred embodiments of the present application have been described in detail hereinbefore. It should be understood by the person skilled in the art that various modifications and variations can be made in accordance with the concepts of the present application without any creative efforts. Accordingly, all the technical solutions obtained by the person skilled in the art according to the concepts of the present application on the basis of the conventional technology through logical analysis, reasoning, or limited experiments should be deemed to fall into the scope of protection of the present application as defined by the claims.