Sanding equipment for commutator hook

Abstract

Sanding equipment for commutator hooks comprises second motors which are linearly arranged, second air cylinders are arranged above the second motors, lower sleeves are slidably connected to output shafts of the second motors through first springs, follow-up cylinders are rotatably arranged at the telescopic ends of the second air cylinders on the two sides, and sanding wheels are arranged on the outer sides of the follow-up cylinders. The telescopic end of the second cylinder in the middle is rotatably provided with an opening pressure head, and the telescopic end of the second cylinder behind the opening pressure head is rotatably provided with an outward turning pressure head. The follow-up cylinder applies pressure to the reverser on the lower sleeve, so that the reverser is tightly jacked in the axial direction, the upper wall and the lower wall of the reverser bear certain friction force, when the lower sleeve rotates, the reverser is driven to rotate under the action of the friction force, sanding operation is achieved, clamping on the circumferential side wall is not needed in the clamping mode, and clamping blind spots do not exist.

Description

Technical Field

[0001] The present invention belongs to the technical field of commutators, and specifically refers to a sanding device for commutator hooks. Background Art

[0002] The commutator is one of the key components of an electric motor. This component consists of multiple copper commutator segments arranged tightly in a circumferential direction. On the inner side of the commutator segment, there is a protrusion that mates with a dovetail groove, which forms a stepped hollow cylindrical structure for the commutator. Mica sheets for insulation are also filled between the commutator segments, and the mica sheets can enhance the radial stability of the commutator.

[0003] There are several prominent problems in the processing of commutators. First, the sanding process requires the treatment of all exposed surfaces. However, due to the hollow cylindrical structure, there will inevitably be blind spots during clamping, which affects the processing quality. Second, for some products, the top of the commutator segment needs to be bent into a hook shape for welding. This process will expose the inner metal, and secondary sanding is also required.

[0004] More critically, although the mica sheets can ensure the radial stability in the circumferential direction, their axial bonding strength is insufficient. The longitudinal bending force generated during the hook operation can easily cause deformation. To address these problems, special support tooling must be equipped for different specifications of commutators. However, due to the variety of commutators, the demand for tooling is large, the management is complex, and the efficiency is reduced. Summary of the Invention

[0005] In view of the above situation, to overcome the defects of the prior art, the present invention provides a sanding device for commutator hooks, which at least partially solves the above problems.

[0006] The technical solution adopted by the present invention is as follows: A sanding device for commutator hooks proposed by the present invention includes linearly arranged second motors. Above the second motors, there are second cylinders. The second motors drive the commutator to rotate, and the second cylinders apply pressure to the commutator. A lower sleeve, which is elastically connected to the output shaft of the second motor through a first spring and achieves synchronous rotation through keyway fitting. A follower cylinder, which is rotatably arranged at the telescopic ends of several second cylinders on both sides. The commutator is clamped between the lower sleeve and the follower cylinder, and a sanding wheel is arranged on the outer side of the follower cylinder. An opening press head, which is rotatably arranged at the telescopic end of the second cylinder in the middle. At the bottom of the opening press head, there is a first conical surface with the tip pointing downward, which is used to make the top opening of the commutator into a conical shape. An outward turning press head, which is rotatably arranged at the telescopic end of the second cylinder behind the opening press head. At the lower end of the outward turning press head, there is a second conical surface with the opening downward, which is used to apply pressure to the top of the commutator and bend it.

[0007] In some embodiments, a sanding device for a commutator hook of the present invention further includes a lower bracket and an upper bracket. The second motors are linearly arranged on the lower bracket, and the second cylinders are linearly arranged on the upper bracket. The output shaft of the second motor is coaxially arranged with the telescopic end of the second cylinder.

[0008] In some embodiments, a conveying table is slidably arranged on the lower bracket. A first motor is threadedly connected to the conveying table. The upper wall of the conveying table is linearly arranged with first cylinders, and the telescopic ends of the first cylinders are provided with clamping jaws for conveying the commutator to each lower sleeve.

[0009] In some embodiments, the sanding wheels include a transverse polishing wheel, a longitudinal polishing wheel, and an inner polishing wheel. The transverse polishing wheel is arranged outside the front follower cylinder and is used for transversely sanding the commutator. The longitudinal polishing wheel is arranged behind the transverse polishing wheel and is used for sanding the axial side wall of the commutator. The inner polishing wheel is arranged outside the last follower cylinder and is used for sanding the inner wall of the commutator hook after it is turned outwards.

[0010] In some embodiments, a roundness correction mechanism is arranged below the outwards-turning pressure head. The roundness correction mechanism includes a correcting clamping cylinder, a rotating ring, and a central fixing ring. The correcting clamping cylinder is fixed to the lower bracket through an outer fixing cylinder. The central fixing ring is fixed to the lower bracket through an inner fixing rod. The rotating ring is rotatably arranged in the area between the correcting clamping cylinder and the central fixing ring, and the rotating ring can slide up and down relative to the central fixing ring and the correcting clamping cylinder.

[0011] In some embodiments, a lifting cylinder is arranged on the lower wall of the rotating ring. A transmission cylinder is arranged at the lower end of the lifting cylinder and is fixed to the lower bracket. A second spring is connected between the lifting cylinder and the transmission cylinder, and the lifting cylinder and the transmission cylinder are slidably connected through a keyway.

[0012] In some embodiments, a driven wheel is sleeved at the bottom of the transmission cylinder, and a driving wheel is meshed with the driven wheel. The driving wheel is arranged on the output shaft of the second motor below the outwards-turning pressure head.

[0013] In some embodiments, multiple groups of outer support rods capable of sliding in the radial direction are arranged through the side wall of the correcting clamping cylinder, and multiple groups of inner support rods capable of sliding in the radial direction are arranged on the central fixing ring.

[0014] In some embodiments, an outer adjustment disc is rotatably arranged on the correcting clamping cylinder. Multiple groups of second inclined grooves are arranged on the outer adjustment disc. An inner adjustment disc is rotatably arranged on the central fixing ring. Multiple groups of first inclined grooves are arranged on the inner adjustment disc. Multiple groups of second sliding grooves are arranged along the radial direction on the correcting clamping cylinder, and multiple groups of first sliding grooves are arranged along the radial direction on the central fixing ring.

[0015] In some embodiments, the outer support rod is simultaneously slidably disposed in the second inclined groove and the second sliding groove through a pin, and the inner support rod is simultaneously slidably disposed in the first inclined groove and the first sliding groove through a pin.

[0016] The beneficial effects achieved by the present invention are as follows: 1. The follower cylinder applies pressure to the commutator on the lower sleeve, so that the commutator is axially tightened. Both the upper and lower walls of the commutator are subject to certain frictional forces. When the lower sleeve rotates, the commutator is driven to rotate under the action of the frictional force, thereby realizing the sanding operation. This clamping method does not require clamping on the circumferential side wall and has no clamping blind spots. The first spring can play a certain buffering role to avoid damage to the copper commutator caused by excessive pressure, and can also ensure a certain frictional force. 2. The correction clamping cylinder can adapt to commutators of various radius types, ensure the stability of the commutator during bending, the rotating ring can drive the commutator to rotate at high speed, and actively correct the deformed parts of the commutator to ensure the roundness of the commutator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural view of the sanding device for the bent commutator of the embodiment of the present invention Figure 1 ; Figure 2 is a schematic structural view of the sanding device for the bent commutator of the embodiment of the present invention Figure 2 ; Figure 3 is a cross-sectional view of the connection relationship between the second motor and the lower sleeve; Figure 4 is a cross-sectional view of the opening press head; Figure 5 is a cross-sectional view of the outward-turning press head; Figure 6 is a cross-sectional view of the roundness correction mechanism; Figure 7 is an exploded view of the components inside the correction clamping cylinder; Figure 8 is a cross-sectional view of the correction clamping cylinder.

[0018] Among them, 1. lower bracket, 2. upper bracket, 3. conveying table, 4. first motor, 5. first cylinder, 6. clamping jaw, 7. second cylinder, 8. second motor, 9. lower sleeve, 10. follower cylinder, 11. transverse polishing wheel, 12. longitudinal polishing wheel, 13. opening press head, 14. outward turning press head, 15. inner polishing wheel, 16. roundness correction mechanism, 17. first spring, 18. first conical surface, 19. first rotating hole, 20. second conical surface, 21. second rotating hole, 22. outer fixing cylinder, 23. lifting cylinder, 24. inner fixing rod, 25. transmission cylinder, 26. second spring, 27. driven wheel, 28. correction clamping cylinder, 29. outer adjustment disc, 30. inner adjustment disc, 31. inner support rod, 32. outer support rod, 33. rotating ring, 34. central fixing ring, 35. first inclined groove, 36. second inclined groove, 37. first sliding groove, 38. second sliding groove, 39. driving wheel.

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. Detailed implementation manners

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0022] As Figures 1 - 5 shown, a sanding device for a commutator hook proposed in an embodiment of the present invention includes a linearly arranged second motor 8, a linearly arranged second cylinder 7, a lower sleeve 9, a follower cylinder 10, an opening press head 13, and an outward turning press head 14. The second cylinder 7 is arranged above the second motor 8. The second motor 8 drives the commutator to rotate so that the sanding operation can be completed when the commutator rotates. The second cylinder 7 applies pressure to the commutator to axially compress and fix the commutator so that the commutator rotates following the second motor 8 under the action of friction.

[0023] The lower sleeve 9 is slidably connected to the output shaft of the second motor 8 through the first spring 17, and the lower sleeve 9 and the output shaft of the second motor 8 are connected by a keyway, that is, the two can only slide up and down and cannot rotate relative to each other. During the sanding operation, the commutator is placed on the lower sleeve 9. The follower cylinder 10 is rotatably arranged on the telescopic ends of several second cylinders 7 on both sides. The follower cylinder 10 can rotate relative to the telescopic rod of the second cylinder 7. During the sanding operation, the follower cylinder 10 moves downward under the drive of the second cylinder 7 and presses against the commutator, so that it is clamped between the lower sleeve 9 and the follower cylinder 10. When the second motor 8 works, it will drive the lower sleeve 9 to rotate, and the commutator on the lower sleeve 9 will rotate following under the action of friction. A sanding wheel is arranged on the outer side of the follower cylinder 10. When the commutator rotates, the sanding wheel is driven to approach and sand the surface of the commutator. Because the commutator is made of copper and has low hardness and strength, after the commutator is pressed, it will compress the lower sleeve 9 synchronously, causing the lower sleeve 9 to compress the first spring 17, avoiding excessive deformation of the commutator under pressure. The first spring 17 plays a certain buffering role and can also ensure that there is sufficient friction between the upper and lower shaft ends of the commutator and no slipping phenomenon occurs.

[0024] The opening punch 13 is rotatably arranged on the telescopic end of the second cylinder 7 in the middle. A first rotating hole 19 is provided in the middle of the upper wall of the opening punch 13. The telescopic end of the second cylinder 7 is rotatably connected to the opening punch 13 through this first rotating hole 19. The working principle of the opening punch 13 is the same as that of the follower cylinder 10. It can rotate relative to the telescopic end of the second cylinder 7 and can also apply pressure to the commutator, so as to rotate together with the commutator and the lower sleeve 9. A first conical surface 18 with a pointed cone downward is provided at the bottom of the opening punch 13. The bottom radius of the first conical surface 18 is smaller than the top radius, so that the first conical surface 18 can be inserted into the center of the commutator. When the first conical surface 18 is inserted into the commutator, pressure is applied to the top of the commutator segment, causing the upper region of the commutator segment to deform to an angle adapted to the first conical surface 18. At this time, the top of the commutator presents a cone with an upward opening, thus completing the pre-bending hook operation of the commutator. The first conical surface 18 can adapt to commutators with different apertures. The top of the small-diameter commutator contacts the inner side of the first conical surface 18, and the top of the large-diameter commutator contacts the outer side of the first conical surface 18. The length of the pre-bending is controlled by the pressing depth of the opening punch 13. In order to avoid longitudinal deformation of the commutator during the pre-bending hook operation, a clamping tool for support can be placed at the bottom of the commutator (i.e., the upper wall of the lower sleeve 9 below the opening punch 13) to force the commutator to remain cylindrical.

[0025] The outward-turning pressing head 14 is rotatably arranged at the telescopic end of the second cylinder 7 behind the opening pressing head 13. A second rotating hole 21 is provided in the middle of the upper wall of the outward-turning pressing head 14. The telescopic end of the second cylinder 7 is rotatably connected to the opening pressing head 13 through this second rotating hole 21. The lower end of the outward-turning pressing head 14 is provided with a second conical surface 20 opening downward, which is used to press the top of the commutator and bend it. The working principle of the outward-turning pressing head 14 is the same as that of the follower cylinder 10. It can also rotate relative to the telescopic end of the second cylinder 7 and can apply pressure to the commutator at the same time, so as to rotate together with the commutator and the lower sleeve 9. While rotating, the commutator segments within the circumference of the commutator are bent. The taper of the second conical surface 20 is the bending angle of the commutator. The second conical surface 20 can be applicable to commutators of different diameters. The top of the commutator with a small diameter contacts the inner side of the second conical surface 20, and the top of the commutator with a large diameter contacts the outer side of the second conical surface 20. The length of the bend is controlled by the pressing depth of the outward-turning pressing head 14. Similarly, in order to avoid longitudinal deformation during operation, during the outward-turning bending operation, a clamping tool for support can also be placed at the bottom of the commutator (i.e., the upper wall of the lower sleeve 9 below the opening pressing head 13) to force the commutator to remain cylindrical.

[0026] In some embodiments, a sanding device for commutator bending proposed in the embodiments of the present invention further includes a lower bracket 1 and an upper bracket 2. The second motors 8 are linearly arranged on the lower bracket 1, and the second cylinders 7 are linearly arranged on the upper bracket 2. The output shafts of the second motors 8 are coaxially arranged with the telescopic ends of the second cylinders 7. A conveying table 3 is slidably arranged on the lower bracket 1. A first motor 4 is threadedly connected in the conveying table 3. The first cylinders 5 are linearly arranged on the upper wall of the conveying table 3. The telescopic ends of the first cylinders 5 are provided with clamping jaws 6. When the first motor 4 rotates, it will drive the conveying table 3 to reciprocate, so as to drive the first cylinders 5 on the conveying table 3 to reciprocate between two adjacent workstations. When the first cylinders 5 contract, the clamping jaws 6 close, so as to clamp the commutator on the lower sleeve 9. The first cylinders 5 follow the conveying table 3 to move to the next workstation. The first cylinders 5 extend, and the clamping jaws 6 open and place the commutator on the lower sleeve 9 at the next workstation, thus completing the conveying operation of the material.

[0027] In some embodiments, the sanding wheel includes a transverse polishing wheel 11, a longitudinal polishing wheel 12, and an inner polishing wheel 15. The transverse polishing wheel 11 is disposed outside the follower cylinder 10 at the front end and is used for transverse sanding of the surface of the commutator that has not been bent. The longitudinal polishing wheel 12 is disposed behind the transverse polishing wheel 11. After the transverse sanding operation, the longitudinal polishing wheel 12 sands from the axial direction of the commutator to avoid blind spots in the sanding operation caused by the inability to cover the grooves between the commutator segments during the transverse sanding operation. The inner polishing wheel 15 is disposed outside the follower cylinder 10 at the rearmost position. The inner polishing wheel 15 is used for sanding the inner wall of the commutator that is turned outwards after bending. When the commutator completes the bending operation, the inner wall of the original commutator segment will be folded to the outside. The original transverse polishing wheel 11 and longitudinal polishing wheel 12 can only sand the outer wall of the commutator and cannot process the inner wall. The inner polishing wheel 15 is used to supplement the sanding to make the surface finish of the folded inner wall of the commutator meet the requirements.

[0028] In some embodiments, as Figure 2 , Figure 6 and Figure 8 shown, in order to reduce the number of bottom support clamping molds of the commutator during the bending operation and enable one mold to be applicable to commutators with multiple different apertures, a roundness correction mechanism 16 is provided below the outward turning press head 14. The roundness correction mechanism 16 includes a correction clamping cylinder 28, a rotating ring 33, and a central fixing ring 34. The correction clamping cylinder 28 is fixed to the lower bracket 1 through an outer fixing cylinder 22. The central fixing ring 34 is fixed to the lower bracket 1 through an inner fixing rod 24. The rotating ring 33 is rotatably disposed in the area between the correction clamping cylinder 28 and the central fixing ring 34. The rotating ring 33 can slide up and down relative to the central fixing ring 34 and the correction clamping cylinder 28. A lifting cylinder 23 is provided on the lower wall of the rotating ring 33. A transmission cylinder 25 is provided at the lower end of the lifting cylinder 23. The transmission cylinder 25 is fixed to the lower bracket 1. A second spring 26 is connected between the lifting cylinder 23 and the transmission cylinder 25. The lifting cylinder 23 and the transmission cylinder 25 are slidably connected through a keyway. The area where the rotating ring 33 is located, that is, the ring body width of the rotating ring 33, is the diameter fluctuation range of the applicable commutator. Commutators within this range can be supported by the rotating ring 33. When the commutator is placed on the rotating ring 33, the upward outward turning press head 14 applies pressure, causing the rotating ring 33 to move downward along the keyway on the inner side wall of the transmission cylinder 25 against the resistance of the second spring 26, which not only ensures that the commutator will not be damaged under greater pressure, but also enables the two ends of the commutator to have sufficient friction, and can also enable the commutator to rotate together with the rotating ring 33 and the transmission cylinder 25 (the working principles of the second spring 26 and the rotating ring 33 are similar to those of the first spring 17 and the lower sleeve 9).

[0029] In some embodiments, a driven wheel 27 is sleeved at the bottom of the transmission cylinder 25. A driving wheel 39 is meshed with the driven wheel 27. The driving wheel 39 is arranged on the output shaft of the second motor 8 below the outward-turning pressure head 14. The second motor 8 drives the transmission cylinder 25 to rotate through the driving wheel 39 and the driven wheel 27, thereby driving the lifting cylinder 23 to rotate, and finally driving the commutator on the rotating ring 33 to rotate, and completing the bending operation during the rotation.

[0030] In some embodiments, as Figure 7 shown, in order to clamp and fix the root of the commutator on the rotating ring 33, multiple groups of outer support rods 32 capable of sliding in the radial direction are provided through the side wall of the correction clamping cylinder 28. Multiple groups of inner support rods 31 capable of sliding in the radial direction are provided on the central fixed ring 34. The ends of the outer support rods 32 and the inner support rods 31 are set to have a certain arc. When the outer support rods 32 and the inner support rods 31 slide towards each other, they can clamp the commutator on the rotating ring 33. The minimum distance between the outer support rods 32 and the inner support rods 31 is the thickness of the rotating ring 33. The distance of the outer support rods 32 and the inner support rods 31 relative to the center of the rotating ring 33 is the diameter of the inner and outer walls of the commutator. The arcs of the outer support rods 32 and the inner support rods 31 are fixedly set. When the radius of their arcs is different from the radius of the arc of the commutator, only the poles of the arcs of the outer support rods 32 and the inner support rods 31 will always contact the inner and outer side walls of the commutator, and there is still a certain distance between the other positions and the commutator, but this distance is controllably controlled within a certain range. This range is respectively the difference between the inner arc diameter of the outer support rod 32 and the outer wall diameter of the commutator, and the difference between the outer arc diameter of the inner support rod 31 and the inner wall diameter of the commutator. This difference is small. Therefore, the maximum deformation amount of the area where the root of the commutator does not contact the outer support rods 32 and the inner support rods 31 will not exceed this difference; when bending, the rotating ring 33 also drives the commutator to rotate at a high frequency at the same time. The deformed area of the commutator will contact the extreme positions of the outer support rods 32 and the inner support rods 31 at a high speed. This extreme position will quickly correct the deformed area of the commutator. The rotation radius of the extreme position remains constant, so that the deformed area of the commutator is restored to a circle, and finally the deformation problem of the commutator is solved.

[0031] In some embodiments, an outer adjustment disk 29 is rotatably provided on the correction clamping cylinder 28. Multiple groups of second inclined slots 36 are provided on the outer adjustment disk 29. An inner adjustment disk 30 is rotatably provided on the central fixed ring 34. Multiple groups of first inclined slots 35 are provided on the inner adjustment disk 30. Multiple groups of second sliding slots 38 distributed in the radial direction are provided on the correction clamping cylinder 28. Multiple groups of first sliding slots 37 distributed in the radial direction are provided on the central fixed ring 34. The outer support rods 32 are simultaneously slidably arranged in the second inclined slots 36 and the second sliding slots 38 through pins. The inner support rods 31 are simultaneously slidably arranged in the first inclined slots 35 and the first sliding slots 37 through pins. Rotating the outer adjustment disk 29 and the inner adjustment disk 30 can make the outer support rods 32 and the inner support rods 31 slide along the radial direction, thereby changing the positions of the outer support rods 32 and the inner support rods 31 to clamp commutators with different diameters and thicknesses.

[0032] After the hook operation is completed, the commutator is conveyed to the last lower sleeve 9, and the inner wall of the turned-out commutator is sanded under the action of the inner polishing wheel 15.

[0033] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0034] The above describes the present invention and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the present invention, design similar structural manners and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A sanding device for commutator hooks, characterized in that, Including: Second motors (8) arranged linearly, with second cylinders (7) respectively provided above each second motor (8); Multiple lower sleeves (9), elastically connected to the output shafts of the second motors (8) through first springs (17), and achieving synchronous rotation through keyway fits; Multiple follower cylinders (10), rotatably arranged at the telescopic ends of several second cylinders (7) on both sides, the commutator is configured to be clamped between the lower sleeve (9) and the follower cylinder (10), and a sanding wheel is provided on the outer side of the follower cylinder (10); An opening punch (13), rotatably arranged at the telescopic end of the second cylinder (7) in the middle, and a first conical surface (18) with a pointed cone downward is provided at the bottom of the opening punch (13); An outward-turning punch (14), rotatably arranged at the telescopic end of the second cylinder (7) behind the opening punch (13), and a second conical surface (20) with an opening downward is provided at the lower end of the outward-turning punch (14).

2. The sanding device for commutator hooks according to claim 1, characterized in that: It further includes a lower bracket (1) and an upper bracket (2), the second motors (8) are arranged linearly on the lower bracket (1), the second cylinders (7) are arranged linearly on the upper bracket (2), and the output shafts of the second motors (8) are coaxially arranged with the telescopic ends of the second cylinders (7).

3. The sanding device for commutator hooks according to claim 2, characterized in that: A conveying table (3) is slidably arranged on the lower bracket (1), a first motor (4) is threadedly connected in the conveying table (3), first cylinders (5) are linearly arranged on the upper wall of the conveying table (3), and clamping claws (6) are provided at the telescopic ends of the first cylinders (5), and the clamping claws (6) are used to convey the commutator to each lower sleeve (9).

4. The sanding device for commutator hooks according to claim 1, characterized in that: The sanding wheel includes a transverse polishing wheel (11), a longitudinal polishing wheel (12) and an inner polishing wheel (15), the transverse polishing wheel (11) is arranged on the outer side of the front follower cylinder (10), the transverse polishing wheel (11) is used for transverse sanding of the commutator, the longitudinal polishing wheel (12) is arranged behind the transverse polishing wheel (11), the longitudinal polishing wheel (12) is used for sanding the axial side wall of the commutator, the inner polishing wheel (15) is arranged on the outer side of the last follower cylinder (10), and the inner polishing wheel (15) is used for sanding the inner wall of the commutator after the hook is turned outward.

5. The sanding device for commutator hooks according to claim 2, characterized in that: A roundness correction mechanism (16) is provided below the outward-turning punch (14), the roundness correction mechanism (16) includes a correction clamping cylinder (28), a rotating ring (33) and a central fixing ring (34), the correction clamping cylinder (28) is fixed to the lower bracket (1) through an outer fixing cylinder (22), the central fixing ring (34) is fixed to the lower bracket (1) through an inner fixing rod (24), the rotating ring (33) is rotatably arranged in the area between the correction clamping cylinder (28) and the central fixing ring (34), and the rotating ring (33) can slide up and down relative to the central fixing ring (34) and the correction clamping cylinder (28).

6. The sanding device for commutator hooks according to claim 5, characterized in that: A lifting cylinder (23) is provided on the lower wall of the rotating ring (33), a transmission cylinder (25) is provided at the lower end of the lifting cylinder (23), the transmission cylinder (25) is fixed to the lower bracket (1), a second spring (26) is connected between the lifting cylinder (23) and the transmission cylinder (25), and the lifting cylinder (23) and the transmission cylinder (25) are slidably connected through a keyway.

7. The sanding device for commutator hooks according to claim 6, characterized in that: A driven wheel (27) is sleeved at the bottom of the transmission cylinder (25), a driving wheel (39) is meshed with the driven wheel (27), and the driving wheel (39) is arranged on the output shaft of a second motor (8) below the outer turning pressure head (14).

8. The sanding device for commutator hooks according to claim 5, characterized in that: A plurality of outer support rods (32) capable of sliding in the radial direction penetrate through the side wall of the correction clamping cylinder (28), and a plurality of inner support rods (31) capable of sliding in the radial direction are arranged on the central fixed ring (34).

9. The sanding device for commutator hooks according to claim 8, characterized in that: An outer adjustment disc (29) is rotatably arranged on the correction clamping cylinder (28), a plurality of second inclined grooves (36) are arranged on the outer adjustment disc (29), an inner adjustment disc (30) is rotatably arranged on the central fixed ring (34), a plurality of first inclined grooves (35) are arranged on the inner adjustment disc (30), a plurality of second sliding grooves (38) distributed in the radial direction are arranged on the correction clamping cylinder (28), and a plurality of first sliding grooves (37) distributed in the radial direction are arranged on the central fixed ring (34).

10. The sanding device for commutator hooks according to claim 9, characterized in that: The outer support rods (32) are simultaneously slidably arranged in the second inclined grooves (36) and the second sliding grooves (38) through pins, and the inner support rods (31) are simultaneously slidably arranged in the first inclined grooves (35) and the first sliding grooves (37) through pins.

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