Carbon brush grinding device for assembling alternating current motor

Abstract

The invention relates to the technical field of grinding devices, in particular to a carbon brush grinding device for assembling an alternating current motor. Comprising a bottom plate; the guide frame is connected to the top of the bottom plate; the controller is mounted at the top of the guide frame; the first electric push rods are symmetrically mounted at the top of the bottom plate; the lifting frame is connected to the guide frame in a sliding mode, and the lifting frame is connected with a telescopic rod of the first electric push rod; the sliding frame is connected to the lifting frame in a sliding mode, and a notch is formed in the sliding frame; and the second electric push rods are symmetrically mounted on the lifting frame. The flexible clamp can clamp and feed carbon brushes of different specifications, meanwhile, through cooperation of the rotating assembly and the switching assembly, the corresponding grinding wheels can be rapidly switched to be aligned with the ends of the carbon brushes, so that rapid switching of the grinding wheels of different sizes can be achieved, the clamp or the grinding wheels do not need to be replaced after shutdown, and the production efficiency is improved. The grinding requirements of carbon brushes of different models are met, the adjusting time is greatly shortened, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the technical field of grinding devices, and more particularly to a carbon brush grinding device for assembling an AC motor. Background Technology

[0002] AC motors are widely used in industrial production, and carbon brushes, as an important component of motors, directly affect the motor's operating performance and lifespan by the quality of their contact with the commutator or slip rings. Therefore, the contact surfaces of carbon brushes need to be finely ground before assembly to ensure the flatness and conductivity of the contact surfaces.

[0003] Currently, carbon brush grinding typically employs specialized grinding equipment. This equipment uses fixtures to hold the carbon brushes in place and a high-speed rotating grinding wheel to grind the brush end faces, creating a curved surface that matches the commutator or slip rings. However, different AC motor models have varying requirements for carbon brush dimensions, and the specifications of the carbon brushes (such as length, width, thickness, and contact surface curvature) can differ significantly. Traditional grinding equipment typically uses fixtures and grinding wheels only compatible with a single type of carbon brush. When processing different brush sizes, it's necessary to change the fixture to the appropriate size or adjust the model and position of the grinding wheel. This process not only requires machine downtime but also disassembly and reinstallation of components, consuming considerable time and severely impacting production efficiency. Furthermore, frequent changes to fixtures and grinding wheels can increase equipment wear and tear, raising maintenance costs, and simultaneously increasing the workload of operators. Summary of the Invention

[0004] In view of this, the present invention provides a carbon brush grinding device for AC motor assembly, which can overcome the disadvantages of traditional grinding devices, where the clamps and grinding wheels are usually only suitable for a single specification of carbon brush. When different specifications of carbon brushes need to be processed, the machine needs to be stopped and the clamps and grinding wheels of the corresponding size need to be replaced, which is time-consuming, labor-intensive and affects production efficiency.

[0005] The technical implementation of this invention is as follows: A carbon brush grinding device for assembling an AC motor, comprising: a base plate; a guide frame connected to the top of the base plate; a controller installed on the top of the guide frame; a first electric push rod symmetrically installed on the top of the base plate; a lifting frame slidably connected to the guide frame, and the lifting frame is connected to the telescopic rod of the first electric push rod; a sliding frame slidably connected to the lifting frame, and the sliding frame has a notch; a second electric push rod symmetrically installed on the lifting frame, and the telescopic rod of the second electric push rod is connected to the sliding frame; a rotating frame rotatably connected to the sliding frame; and a connecting column connected to the rotating frame. The frame consists of: a central rotating disk rotatably connected to a sliding frame, with the upper end of a connecting column connected to the rotating disk; connecting rods circumferentially spaced on the rotating disk; multiple grinding wheels, each vertically distributed and slidably connected to the connecting rods, with each grinding wheel having a different size; a rotating assembly on the rotating disk for driving the connecting rods to rotate; a switching assembly on the sliding frame for switching between different grinding wheels to grind the carbon brush; a limiting assembly on the sliding frame for limiting the grinding wheels; and a clamping assembly on the base plate for clamping the carbon brush.

[0006] More preferably, the rotating assembly includes: a drive motor mounted on the top of the rotating disk; a drive gear connected to the output shaft of the drive motor; and a driven gear connected to the upper end of the connecting rod, wherein the driven gear meshes with the drive gear.

[0007] More preferably, the switching assembly includes: a first servo motor mounted on the top of the sliding frame; a full gear connected to the output shaft of the first servo motor; and an external gear ring connected to the outside of the rotating disk, with the external gear ring meshing with the full gear.

[0008] More preferably, the limiting component includes: a guide rod, circumferentially spaced and connected to the bottom of the rotating frame; a connecting plate, connected to the lower end of the guide rod; a lifting block, slidably connected to the guide rod; a connecting spring, wrapped around the outside of the guide rod, with both ends of the connecting spring connected to the lifting block and the connecting plate respectively; a disc, rotatably connected to the lifting block, with the bottom of the lowest grinding wheel contacting the top of the disc; and a fixing mechanism, disposed on the connecting plate, for fixing the lifting block.

[0009] More preferably, the fixing mechanism includes: a rotating plate, which is circumferentially rotatably connected to the connecting plate; and a torsion spring, which is wound around the outside of the rotating shaft of the rotating plate, with its two ends connected to the rotating plate and the connecting plate respectively.

[0010] More preferably, the clamping assembly includes: a fixed frame connected to the top of the base plate; a feeding frame connected to the side of the fixed frame; a rotating block rotatably connected to the top of the fixed frame; a second servo motor mounted on the fixed frame, with the output shaft of the second servo motor connected to the bottom of the rotating block; bidirectional electric push rods symmetrically mounted on both sides of the rotating block; and flexible clamps mounted on the telescopic rods on both sides of the bidirectional electric push rods.

[0011] More preferably, it also includes: a rotating lever, rotatably connected to the bottom of the sliding frame, and the rotating lever engaging with the lifting block; and a magnet, connected to the bottom of the sliding frame, and the magnet attracting the rotating lever by magnetic force.

[0012] More preferably, it also includes: a partition frame connected to the top of the rotating frame; a fixed frame connected to the top of the base plate; a sealing cover placed on the top of the fixed frame; a connecting pipe symmetrically connected to the top of the sealing cover and maintaining communication; a connecting cover symmetrically connected to the side of the sliding frame and maintaining communication, and the upper end of the connecting pipe is connected to the connecting cover and maintaining communication; a fan installed on the top of the base plate, and the air inlet of the fan maintaining communication with the side of the fixed frame; a bracket connected to the bottom of the fixed frame; and a cloth bag fitted onto the bracket.

[0013] Compared with the prior art, the present invention has the following advantages: 1. The flexible clamp of the present invention can clamp and feed carbon brushes of different specifications. At the same time, through the cooperation of the rotating component and the switching component, the corresponding grinding wheel can be quickly switched to be aligned with the end of the carbon brush, thereby realizing the rapid switching of grinding wheels of different sizes without stopping the machine to change the clamp or grinding wheel, adapting to the grinding needs of different models of carbon brushes, greatly reducing adjustment time and improving production efficiency.

[0014] 2. This invention utilizes the linkage design of the lifting block, disc, and rotating plate of the limiting component. When the lifting block rotates to the notch position, it can be manually pressed down and fixed, so that the grinding wheel is disengaged from the connecting rod, realizing the quick disassembly and assembly of the grinding wheel. With the adsorption and positioning of the rotating rod and the magnet, the grinding wheel is stably limited in the non-replacement state, reducing accidental loosening and lowering the frequency and cost of equipment maintenance.

[0015] 3. This invention uses a fan in conjunction with a connecting cover and a cloth bag to actively suck up dust during the polishing process. After being filtered by a fixed frame, the dust is collected in a concentrated manner to prevent dust from spreading. The separator divides the polishing area, enhancing the targeting of dust suction, effectively protecting the internal transmission components of the equipment from contamination, and improving the working environment for operators. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a schematic diagram of the specific structure of the lifting frame, sliding frame, and second electric push rod of the present invention.

[0018] Figure 3 This is a schematic diagram showing the installation of the rotating frame, connecting column, rotating disk, connecting rod, and grinding wheel of the present invention.

[0019] Figure 4 This is a schematic diagram of the installation of the rotating component and the switching component of the present invention.

[0020] Figure 5 This is a schematic diagram of the installation of the limiting component of the present invention.

[0021] Figure 6 This is a schematic diagram of the specific structure of the lifting block and connecting spring of the present invention.

[0022] Figure 7 This is a schematic diagram of the installation of the rotating plate and torsion spring of the present invention.

[0023] Figure 8 This is a schematic diagram of the installation of the fixing frame, the feeding frame and the rotating block of the present invention.

[0024] Figure 9 This is a schematic diagram showing the installation of the second servo motor, bidirectional electric actuator, and flexible clamp of the present invention.

[0025] Figure 10 This is a schematic diagram showing the installation of the rotating lever and magnet of the present invention.

[0026] Figure 11 This is a schematic diagram of the installation of the separator, fixing frame, connecting pipe, connecting cover and fan of the present invention.

[0027] Figure 12 This is a schematic diagram of the specific structure of the support and the cloth bag of the present invention.

[0028] Figure 13 This is a schematic diagram of the separation structure of the support and the cloth bag of the present invention.

[0029] The above-mentioned attached drawings include the following reference numerals: 1. Base plate; 2. Guide frame; 3. Controller; 4. First electric push rod; 5. Lifting frame; 6. Sliding frame; 601. Notch; 7. Second electric push rod; 8. Rotating frame; 9. Connecting column; 10. Rotating disk; 11. Connecting rod; 12. Grinding wheel; 13. Drive motor; 14. Driving gear; 15. Driven gear; 16. First servo motor; 17. Full gear; 18. External gear ring; 19. Guide rod; 2 0. Connecting plate, 21. Lifting block, 22. Connecting spring, 23. Disc, 24. Rotating clamp, 25. Torsion spring, 26. Fixing frame, 27. Unloading frame, 28. Rotating block, 29. Second servo motor, 30. Bidirectional electric push rod, 31. Flexible clamp, 32. Rotating clamp, 33. Magnet, 34. Divider, 35. Fixing frame, 3501. Sealing cover, 36. Connecting pipe, 37. Connecting cover, 38. Fan, 39. Bracket, 40. Cloth bag. Detailed Implementation

[0030] Example: A carbon brush grinding device for assembling an AC motor, such as... Figures 1-9 As shown, the assembly includes a base plate 1, a guide frame 2, a controller 3, a first electric push rod 4, a lifting frame 5, a sliding frame 6, a second electric push rod 7, a rotating frame 8, a connecting column 9, a rotating disk 10, a connecting rod 11, a grinding wheel 12, a rotating assembly, a switching assembly, a limiting assembly, and a clamping assembly. The guide frame 2 is connected to the top right side of the base plate 1, and the controller 3 is connected to the top of the guide frame 2. Four first electric push rods 4 are installed at intervals on the top right side of the base plate 1. The lifting frame 5 is slidably connected to the guide frame 2, and the bottom of the lifting frame 5 is connected to the telescopic rod of the first electric push rod 4. The sliding frame 6 is slidably connected to the lifting frame 5, and a notch 601 is opened on the front left side of the sliding frame 6. Second electric push rods 7 are installed on both the upper and lower sides of the middle of the lifting frame 5, and the telescopic rods of the second electric push rods 7 are connected to the sliding frame 6. The left side of the sliding frame 6... A rotating frame 8 is rotatably connected to the lower side of the sliding frame 6. A connecting column 9 is connected to the middle of the rotating frame 8. A rotating disk 10 is rotatably connected to the upper left side of the sliding frame 6. The rotating disk 10 is hollow, and the upper end of the connecting column 9 is connected to the bottom of the rotating disk 10. Four connecting rods 11 are circumferentially connected to the rotating disk 10. One side of the connecting rod 11 is flat. Three grinding wheels 12 are slidably connected to each of the four connecting rods 11. There are twelve grinding wheels 12 in total, and the twelve grinding wheels 12 are all different in size. The rotating disk 10 is provided with a rotating component for driving the connecting rods 11 to rotate. The sliding frame 6 is provided with a switching component for switching different grinding wheels 12 to grind the carbon brush. The sliding frame 6 is also provided with a limiting component for limiting the grinding wheels 12. The base plate 1 is provided with a clamping component for clamping the carbon brush.

[0031] like Figure 4As shown, the rotating assembly includes a drive motor 13, a drive gear 14, and a driven gear 15. The drive motor 13 is mounted in the middle of the top of the rotating disk 10. The drive gear 14 is connected to the output shaft of the drive motor 13. The upper ends of the four connecting rods 11 are all connected to the driven gears 15. The driven gears 15 and the drive gears 14 are both located inside the rotating disk 10, and all four driven gears 15 mesh with the drive gears 14.

[0032] like Figure 4 As shown, the switching assembly includes a first servo motor 16, a full gear 17, and an external gear ring 18. The first servo motor 16 is mounted on the top of the sliding frame 6. The full gear 17 is connected to the output shaft of the first servo motor 16. The external gear ring 18 is connected to the outer side of the rotating disk 10, and the external gear ring 18 meshes with the full gear 17.

[0033] like Figures 5-7 As shown, the limiting assembly includes guide rods 19, connecting discs 20, lifting blocks 21, connecting springs 22, discs 23, and a fixing mechanism. Four sets of guide rods 19 are circumferentially spaced at the bottom of the rotating frame 8, with two guide rods in each set. Connecting discs 20 are connected between the bottoms of the eight guide rods 19, and the top of the connecting discs 20 is connected to the bottom of the connecting column 9. Lifting blocks 21 are slidably connected between the two guide rods 19 in the same set. The shape of the lifting blocks 21 matches the shape of the rotating frame 8. A connecting spring 22 is wound around the outer side of each guide rod 19, and the two ends of the connecting spring 22 are respectively connected to the bottom of the lifting block 21 and the connecting disc 20. At the top, each lifting block 21 is rotatably connected to a disc 23, and the bottom of the grinding wheel 12 at the bottom side contacts the top of the disc 23. The connecting plate 20 is provided with a fixing mechanism for fixing the lifting block 21. The fixing mechanism includes a rotating plate 24 and a torsion spring 25. The connecting plate 20 is rotatably connected to four rotating plates 24 at intervals around the circumference. The rotating plates 24 correspond one-to-one with the lifting blocks 21, and the rotating plates 24 are located directly below the lifting blocks 21. The top of the rotating plates 24 is an arc surface. The rotating shaft of the rotating plates 24 is wrapped with a torsion spring 25, and the two ends of the torsion spring 25 are respectively connected to the rotating plates 24 and the connecting plate 20.

[0034] like Figure 8 and Figure 9 As shown, the clamping assembly includes a fixed frame 26, a feeding frame 27, a rotating block 28, a second servo motor 29, a bidirectional electric push rod 30, and a flexible clamp 31. The fixed frame 26 is connected to the top left side of the base plate 1, the feeding frame 27 is connected to the front side of the fixed frame 26, the rotating block 28 is rotatably connected to the top of the fixed frame 26, the second servo motor 29 is installed on the upper side inside the fixed frame 26, and the output shaft of the second servo motor 29 is connected to the bottom of the rotating block 28. The bidirectional electric push rod 30 is installed on both the left and right sides of the rotating block 28, and the flexible clamp 31 is installed on the telescopic rods on the front and rear sides of the bidirectional electric push rod 30.

[0035] When the device is needed, it is first installed in the designated position, positioned to the right of the feeding equipment. Then, the controller 3 controls the drive motor 13 to drive the drive gear 14 to rotate. The drive gear 14 drives the driven gear 15 to rotate, thereby driving all the connecting rods 11 and the grinding wheel 12 to rotate. The disc 23 can rotate synchronously with the grinding wheel 12, thus reducing the wear of the grinding wheel 12. Next, the controller 3 controls the left-side bidirectional electric push rod 30 to drive the two left-side flexible clamps 31 to move away from each other and open. Then, the feeding equipment delivers the carbon brush between the two left-side flexible clamps 31. Finally, the controller 3 controls the left-side bidirectional electric push rod 30 to drive the two left-side flexible clamps 31 to move away from each other and open. 1. Move the two flexible clamps 31 on the left side to clamp the carbon brush, and then control the second servo motor 29 to drive the rotating block 28 to rotate 180 degrees clockwise. The rotating block 28, through the flexible clamps 31, can drive the carbon brush to rotate to the left side of the sliding frame 6, and align the end of the carbon brush with one of the grinding wheels 12 horizontally. The other set of flexible clamps 31 will rotate to align with the feeding device to clamp the next carbon brush. Then, the controller 3 controls the second electric push rod 7 to drive the sliding frame 6 to move to the left. The sliding frame 6 can drive the grinding wheel 12 to move to the left. When the grinding wheel 12 contacts the end of the carbon brush, the grinding wheel 12 can grind the end of the carbon brush into an arc surface, thereby completing the grinding process of the carbon brush. Then the controller 3 The controller controls the second electric push rod 7 to drive the sliding frame 6 to move to the right and reset. The sliding frame 6 can drive the grinding wheel 12 to move to the right and reset, so that the grinding wheel 12 disengages from the carbon brush. Then, the controller 3 controls the rotating block 28 to rotate 180 degrees clockwise. The rotating block 28 can drive the ground carbon brush to rotate 180 degrees clockwise through the flexible clamp 31. When the ground carbon brush rotates to the top of the feeding frame 27, the controller 3 will control the flexible clamp 31 to release the ground carbon brush, so that the ground carbon brush falls down into the feeding frame 27 and slides down the feeding frame 27 for discharge. The rotating block 28 can also drive the next carbon brush to rotate to the left side of the sliding frame 6 through another set of flexible clamps 31. Repeating the above operation can continuously process the carbon brush. Grinding process; When it is necessary to grind carbon brushes of different specifications, the controller 3 only needs to control the first servo motor 16 to drive the full gear 17 to rotate. The full gear 17 drives the outer gear ring 18 to rotate. The outer gear ring 18 drives the rotating disk 10 to rotate. The rotating disk 10 can drive the connecting rod 11 and the grinding wheel 12 to rotate, so that the corresponding grinding wheel 12 rotates to the left side of the sliding frame 6. Then, the first electric push rod 4 drives the lifting frame 5 to rise and fall. The lifting frame 5 can drive the sliding frame 6 to rise and fall. The sliding frame 6 drives the grinding wheel 12 to rise and fall, so that the corresponding grinding wheel 12 rises and falls to be horizontally aligned with the flexible clamp 31. In this way, carbon brushes of different specifications can be ground, and the flexible clamp 31 can also clamp carbon brushes of different specifications.When the grinding wheel 12 needs to be replaced, the controller 3 first controls the grinding wheel 12 to be replaced to rotate until it aligns with the notch 601, so that the lifting block 21 corresponding to the grinding wheel 12 rotates to the notch 601, that is, the lifting block 21 is disengaged from the sliding frame 6. Then, the lifting block 21 can be pulled down, the connecting spring 22 is compressed, and the lifting block 21 will drive the disc 23 to move downward, so that the disc 23 is disengaged from the grinding wheel 12. When the lifting block 21 contacts the rotating plate 24, the lifting block 21 will squeeze the rotating plate 24 to rotate away from the grinding wheel 12, and the torsion spring 25 will deform. When the lifting block 21 is disengaged from the rotating plate 24, the torsion spring 25 returns to its original shape, driving the rotating plate 24 to rotate and reset towards the grinding wheel 12, so that the rotating plate 24 is locked. Hold the top of the lifting block 21 to fix its position. Then, pull the grinding wheel 12 down along the connecting rod 11 to disengage it for replacement. After replacement, pull the rotating plate 24 away from the grinding wheel 12. The torsion spring 25 deforms, causing the rotating plate 24 to release the lifting block 21. At this time, the connecting spring 22 returns to its original state, driving the lifting block 21 and the disc 23 upward to reset. This allows the top of the disc 23 to re-contact the bottom of the lowest grinding wheel 12, limiting its movement and preventing it from disengaging from the connecting rod 11. Finally, release the rotating plate 24, and the torsion spring 25 returns to its original state, causing the rotating plate 24 to rotate closer to the grinding wheel 12.

[0036] like Figure 10 As shown, it also includes a rotating lever 32 and a magnet 33. The rotating lever 32 is rotatably connected to the bottom front left side of the sliding frame 6, and the rotating lever 32 is in contact with the lifting block 21. The rotating lever 32 is made of iron, and the magnet 33 is connected to the bottom front right side of the sliding frame 6.

[0037] Initially, magnet 33 magnetically attracts rotating lever 32, thus fixing its position. When lifting block 21 rotates to notch 601, rotating lever 32 supports lifting block 21, preventing it from moving downwards due to the weight of grinding wheel 12. When grinding wheel 12 needs to be replaced, rotating lever 32 can be rotated forward to open it, disengaging it from magnet 33 and lifting block 21. Then, lifting block 21 can be moved downwards to replace grinding wheel 12.

[0038] like Figures 11-13As shown, it also includes a partition frame 34, a fixed frame 35, a sealing cover 3501, a connecting pipe 36, a connecting cover 37, a fan 38, a bracket 39, and a cloth bag 40. The top of the rotating frame 8 is connected to the partition frame 34, which divides the left part of the sliding frame 6 into four independent areas. The four connecting rods 11 are located in the four independent areas respectively. The top middle of the base plate 1 is connected to the fixed frame 35, and the top of the fixed frame 35 is placed with the sealing cover 3501. The top of the sealing cover 3501 is symmetrically connected to the front and back of the front and rear ...

[0039] When the grinding wheel 12 is grinding the end of the carbon brush, the controller 3 can control the fan 38 to draw air from inside the fixed frame 35 and the connecting pipe 36, so that the connecting cover 37 generates suction, which allows the connecting cover 37 to suck the dust generated by grinding into the fixed frame 35. The cloth bag 40 can filter the dust in the fixed frame 35 to prevent the dust from entering the fan 38. When the cloth bag 40 is filled with a certain amount of dust, the sealing cover 3501 can be pulled up to open, and then the cloth bag 40 on the bracket 39 can be replaced.

Claims

1. A carbon brush grinding device for assembling an AC motor, comprising: a base plate (1); characterized in that, It also includes: a guide frame (2), which is connected to the top of the base plate (1); The controller (3) is installed on the top of the guide frame (2); the first electric push rod (4) is symmetrically installed on the top of the base plate (1); the lifting frame (5) is slidably connected to the guide frame (2), and the lifting frame (5) is connected to the telescopic rod of the first electric push rod (4); the sliding frame (6) is slidably connected to the lifting frame (5), and the sliding frame (6) has a notch (601); the second electric push rod (7) is symmetrically installed on the lifting frame (5), and the telescopic rod of the second electric push rod (7) is connected to the sliding frame (6); the rotating frame (8) is rotatably connected to the sliding frame (6); the connecting column (9) is connected to the middle of the rotating frame (8); the rotating disk (10) is rotatably connected to the sliding frame (1). 6) The upper end of the connecting column (9) is connected to the rotating disk (10); the connecting rod (11) is circumferentially connected to the rotating disk (10); the grinding wheel (12) is vertically distributed and slidably connected to the connecting rod (11), and the size of each grinding wheel (12) is different; the rotating component is set on the rotating disk (10) and is used to drive the connecting rod (11) to rotate; the switching component is set on the sliding frame (6) and is used to switch different grinding wheels (12) to grind the carbon brush; the limiting component is set on the sliding frame (6) and is used to limit the grinding wheel (12); the clamping component is set on the base plate (1) and is used to clamp the carbon brush.

2. A carbon brush grinding device for assembling an AC motor according to claim 1, characterized in that, The rotating assembly includes: a drive motor (13) mounted on the top of the rotating disk (10); a drive gear (14) connected to the output shaft of the drive motor (13); and a driven gear (15) connected to the upper end of the connecting rod (11), and the driven gear (15) meshes with the drive gear (14).

3. A carbon brush grinding device for assembling an AC motor according to claim 1, characterized in that, The switching components include: a first servo motor (16) mounted on the top of the sliding frame (6); a full gear (17) connected to the output shaft of the first servo motor (16); and an external gear ring (18) connected to the outside of the rotating disk (10), and the external gear ring (18) meshes with the full gear (17).

4. A carbon brush grinding device for assembling an AC motor according to claim 1, characterized in that, The limiting assembly includes: a guide rod (19) circumferentially spaced at the bottom of the rotating frame (8); a connecting plate (20) connected to the lower end of the guide rod (19); a lifting block (21) slidably connected to the guide rod (19); a connecting spring (22) wrapped around the outside of the guide rod (19), and the two ends of the connecting spring (22) are respectively connected to the lifting block (21) and the connecting plate (20); a disc (23) rotatably connected to the lifting block (21), and the bottom of the lowest grinding wheel (12) contacts the top of the disc (23); and a fixing mechanism set on the connecting plate (20) for fixing the lifting block (21).

5. A carbon brush grinding device for assembling an AC motor according to claim 4, characterized in that, The fixing mechanism includes: a rotating plate (24) that is circumferentially rotatably connected to the connecting plate (20); and a torsion spring (25) that is wrapped around the outside of the rotating shaft of the rotating plate (24), with the two ends of the torsion spring (25) connected to the rotating plate (24) and the connecting plate (20) respectively.

6. A carbon brush grinding device for assembling an AC motor according to claim 1, characterized in that, The clamping assembly includes: a fixed frame (26) connected to the top of the base plate (1); a feeding frame (27) connected to the side of the fixed frame (26); a rotating block (28) rotatably connected to the top of the fixed frame (26); a second servo motor (29) mounted on the fixed frame (26), and the output shaft of the second servo motor (29) is connected to the bottom of the rotating block (28); a bidirectional electric push rod (30) symmetrically mounted on both sides of the rotating block (28); and a flexible clamp (31) mounted on the telescopic rods on both sides of the bidirectional electric push rod (30).

7. A carbon brush grinding device for assembling an AC motor according to claim 4, characterized in that, It also includes: a rotating lever (32), which is rotatably connected to the bottom of the sliding frame (6), and the rotating lever (32) is in contact with the lifting block (21); A magnet (33) is attached to the bottom of the sliding frame (6), and the magnet (33) holds the rotating lever (32) by magnetic force.

8. A carbon brush grinding device for assembling an AC motor according to claim 1, characterized in that, It also includes: a partition frame (34), connected to the top of the rotating frame (8); a fixed frame (35), connected to the top of the base plate (1); a sealing cover (3501), placed on the top of the fixed frame (35); a connecting pipe (36), symmetrically connected to the top of the sealing cover (3501) and kept in communication; a connecting cover (37), symmetrically connected to the side of the sliding frame (6) and kept in communication, and the upper end of the connecting pipe (36) is connected to the connecting cover (37) and kept in communication; a fan (38), installed on the top of the base plate (1), and the air inlet of the fan (38) is kept in communication with the side of the fixed frame (35); a bracket (39), connected to the bottom of the fixed frame (35); and a cloth bag (40), which is put on the bracket (39).

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