Brush pre-polishing device for electric brush

Abstract

The invention relates to the technical field of electric brush production, in particular to an electric brush pre-polishing device which comprises a polishing wheel and a base frame. The base frame comprises an upper ring body and a lower ring body which are vertically arranged at an interval, and the upper ring body and the lower ring body are connected through a plurality of connecting rods; a bottom cover is mounted on the bottom surface of the lower ring body; an upper shaft neck on the top surface of the polish-brush wheel is mounted in a center hole of the upper ring body through an upper bearing, and a lower shaft neck on the bottom surface of the polish-brush wheel is mounted in a center hole of the bottom cover through a lower bearing; a plurality of polish-brush sleeves are annularly and uniformly distributed on the bottom surface of the upper ring body; an electric brush mounting hole is formed in the polishing brush sleeve and is used for mounting a to-be-polished electric brush in a sliding manner; a plurality of pushing devices are annularly and uniformly distributed on the top surface of the lower ring body and are used for radially pushing a to-be-polished electric brush to abut against the peripheral surface of the polishing brush wheel; and a connecting shaft is integrally formed on the bottom surface of the lower shaft neck, downwards penetrates out of the bottom cover and is used for being connected with an output shaft of a driving motor. The pushing device can provide pre-pressure for the electric brush to be ground, and the pre-grinding effect can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of brush production, and particularly to a brush pre-grinding device for brushes. Background Art

[0002] The brush is an important component of a brushed motor and is the conductive part for the rotation of the motor. The surface of the brush in contact with the commutator must be an arc surface matching the arc of the commutator for normal operation. However, the end face of the brush is usually flat. The method of directly conducting power-on running-in (electrical running-in) on the whole machine has low production efficiency, wastes resources, and at the same time damages the surface of the rotor commutator. Therefore, it is necessary to perform arc machining on the brush, that is, pre-grind the brush, which requires the use of a pre-grinding device.

[0003] In the prior art, for example, the patent with the publication number CN206225765U discloses a brush pre-grinding device. When in use, all the brushes are installed in the brush holders according to the number of motor poles (the number of poles corresponds to the number of brush groups). The brush wheel is driven to rotate by turning the handle to pre-grind the brushes. After rotating several circles, the brushes are taken out to check whether the friction surface meets the requirements. If the requirements are met, all the brushes can be taken out for the next group of pre-grinding. If the requirements are not met, they are reinstalled and pre-ground again until the requirements are met. Another example is the patent with the publication number CN209021824U, which discloses a brush pre-grinding device. The motor drives the grinding wheel to rotate through the rotating shaft, and the grinding wheel pre-grinds the brushes on its outer side. Since the cross-sectional shape of the placement rack is set to be arc-shaped, the upper half space of the grinding wheel can be used to place the brushes, so that the present utility model can pre-grind multiple brushes at the same time.

[0004] However, in the above-mentioned brush pre-grinding devices in the prior art, during pre-grinding, the brushes to be ground are kept in contact with the grinding wheel under their own gravity for grinding. However, due to the small weight of the brushes themselves, during the grinding process, if only relying on their own gravity, it is impossible to ensure close contact between the brushes and the grinding wheel, and thus it is impossible to ensure the pre-grinding effect. At the same time, the amount of material removed during pre-grinding is not controlled, resulting in uneven removal of the pre-ground brushes, and the lengths of the brushes after pre-grinding are different, affecting the consistency of the brushes, the performance of the motor, and the service life. Summary of the Invention

[0005] The main object of the present invention is to propose a brush pre-grinding device for brushes, aiming to solve the above technical problems.

[0006] To achieve the above object, the present invention provides a brush pre-grinding device, which includes a grinding wheel and a base frame; the base frame includes an upper ring body and a lower ring body arranged at intervals up and down, and the upper ring body and the lower ring body are connected by a plurality of connecting rods; a bottom cover is installed on the bottom surface of the lower ring body; the upper journal on the top surface of the grinding wheel is installed in the central hole of the upper ring body through an upper bearing, and the lower journal on the bottom surface of the grinding wheel is installed in the central hole of the bottom cover through a lower bearing; a plurality of grinding brush sleeves are annularly and uniformly distributed on the bottom surface of the upper ring body; a brush installation hole is provided on the grinding brush sleeve for slidably installing the brush to be ground; a plurality of pushing devices are annularly and uniformly distributed on the top surface of the lower ring body, and are used for radially pushing the brush to be ground against the outer peripheral surface of the grinding wheel; a connecting shaft is integrally formed on the bottom surface of the lower journal, and the connecting shaft extends downward through the bottom cover for connecting with the output shaft of the driving motor.

[0007] Preferably, the number of brush installation holes provided on the grinding brush sleeve is two, and the two brush installation holes are arranged vertically.

[0008] Preferably, a plurality of positioning grooves are annularly and uniformly distributed on the bottom surface of the upper ring body, and the positioning grooves are arranged along the radial direction; a positioning protrusion is provided on the top surface of the grinding brush sleeve; the positioning protrusion is clamped in the positioning groove, and the upper ring body and the grinding brush sleeve are fixedly connected by a first screw, and the first screw passes through the upper ring body from top to bottom and is screwed on the top surface of the grinding brush sleeve.

[0009] Preferably, a sunk groove is provided on the top surface of the bottom cover.

[0010] Preferably, the pushing device includes a seat body and a push block; the seat body includes a bottom plate, a mounting block integrally formed on the top surface of the bottom plate and a baffle; the baffle is located on the top surface of the outer end of the bottom plate, and a U-shaped opening is provided on the baffle; the push block is slidably inserted into the rectangular hole of the mounting block; the inner end of the push block abuts against the end surface of the brush to be ground; the pushing device further includes a power source for providing a radial force to the push block.

[0011] Preferably, the power source is a spring; a pull rod is provided on the end surface of the outer end of the push block, and the outer end of the pull rod passes through the U-shaped opening; a handle rod is horizontally inserted into the end head of the outer end of the pull rod; the spring is sleeved on the pull rod, and the inner end of the spring abuts against the push block, and the outer end of the spring abuts against the baffle; the spring is always in a compressed energy storage state.

[0012] Optionally, the power source is a cylinder; the cylinder is installed on the baffle; the telescopic rod of the cylinder passes through the U-shaped opening and is connected to the push block.

[0013] Preferably, the seat body, the lower ring body and the bottom cover are tightly connected by second screws; the second screws sequentially pass through the bottom plate and the lower ring body from top to bottom and are then screwed tightly on the bottom cover.

[0014] Preferably, a U-shaped limiting groove is formed in the pushing block, and the opening of the U-shaped limiting groove faces the grinding brush wheel; a limiting pin is horizontally inserted into the mounting block; the limiting pin extends into the limiting groove.

[0015] Preferably, the upper ring body, the lower ring body and the connecting rod are of an integrally formed structure, and two adjacent connecting rods and the upper ring body and the lower ring body together enclose a brush grinding opening; a grinding brush sleeve is arranged at each brush grinding opening; a pushing device is correspondingly arranged for each grinding brush sleeve.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0017] (1) In the present invention, a plurality of pushing devices are annularly and uniformly arranged on the top surface of the lower ring body for radially pushing the brush to be ground against the outer peripheral surface of the grinding brush wheel. During grinding, the pushing device can provide a pre-pressure for the brush to be ground, so that the brush to be ground can always be abutted against the grinding brush wheel for grinding, which is beneficial to ensuring the pre-grinding effect.

[0018] (2) The device provided by the present invention has a simple structure and strong versatility. The brushes processed by using this device can improve the efficiency, qualification rate and consistency of the pre-grinding of the brushes.

[0019] (3) Under the combined action of the limiting pin and the limiting groove on the pushing block in the device provided by the present invention, a mechanical limiting mechanism is formed, which can ensure the consistency of the removal amount, ensure the consistency of the length of the brush after pre-grinding, and avoid the problems that excessive removal amount of the brush in the prior art affects the service life and large performance discreteness caused by inconsistent removal amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0021] Figure 1 It is an exploded view of the brush pre-grinding device in the first embodiment of the present invention;

[0022] Figure 2 It is an overall structure diagram of the brush pre-grinding device in the first embodiment of the present invention;

[0023] Figure 3Stereoscopic structure diagram of the base frame in the present invention;

[0024] Figure 4 Stereoscopic structure diagram of the grinding brush sleeve in the present invention;

[0025] Figure 5 Stereoscopic structure diagram of the seat body in the present invention;

[0026] Figure 6 Schematic diagram when the pull rod and the push block cooperate in the first embodiment of the present invention;

[0027] Figure 7 Overall structure diagram of the brush pre-grinding device in the second embodiment of the present invention;

[0028] Figure 8 Usage state diagram of the brush pre-grinding device provided by the present invention.

[0029] Explanation of the reference numerals in the attached drawings: 1. Grinding brush wheel; 1a. Upper journal; 1b. Lower journal; 1c. Connecting shaft; 2. Base frame; 2a. Upper ring body; 2b. Connecting rod; 2c. Lower ring body; 2d. Positioning groove; 2e. Brush grinding port; 3. Bottom cover; 3a. Counterbore; 4. Upper bearing; 5. Lower bearing; 6. Grinding brush sleeve; 6a. Brush mounting hole; 6b. Positioning protrusion; 7. First screw; 8. Seat body; 8a. Bottom plate; 8b. Mounting block; 8c. Baffle; 8d. U-shaped opening; 9. Push block; 9a. U-shaped limiting groove; 10. Spring; 11. Pull rod; 12. Handle rod; 13. Cylinder; 14. Second screw; 15. Limit pin; 16. Bearing sleeve; 17. Box body; 18. Partition; 19. Driving motor; 20. Dust suction port; 100. Brush to be ground. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0032] For the sake of convenience of description, in the embodiments of the present invention, the "inner end" represents the end along the radial direction inward, and the "outer end" represents the end along the radial direction outward.

[0033] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or is unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] Embodiment 1:

[0035] Combined with Figures 1 to 6 As shown, it is the first embodiment of a brush pre-grinding device provided by the present invention. The brush pre-grinding device includes a grinding brush wheel 1 and a base frame 2; the base frame 2 includes an upper ring body 2a and a lower ring body 2c arranged at intervals up and down, and the upper ring body 2a and the lower ring body 2c are connected by a plurality of connecting rods 2b; a bottom cover 3 is installed on the bottom surface of the lower ring body 2c; the upper journal 1a on the top surface of the grinding brush wheel 1 is installed in the central hole of the upper ring body 2a through an upper bearing 4, and a bearing sleeve 16 is arranged between the upper bearing 4 and the upper ring body 2a. The lower journal 1b on the bottom surface of the grinding brush wheel 1 is installed in the central hole of the bottom cover 3 through a lower bearing 5; a plurality of grinding brush sleeves 6 are annularly and evenly distributed on the bottom surface of the upper ring body 2a; a brush mounting hole 6a is provided on the grinding brush sleeve 6 for slidably mounting the brush to be ground 100; a plurality of pushing devices are annularly and evenly distributed on the top surface of the lower ring body 2c for radially pushing the brush to be ground 100 against the outer peripheral surface of the grinding brush wheel 1; a connecting shaft 1c is integrally formed on the bottom surface of the lower journal 1b, and the connecting shaft 1c extends downward through the bottom cover 3 for connecting with the output shaft of a driving motor.

[0036] Combined with Figure 4 As shown, in order to increase the loading capacity of the device for the brush to be ground 100 and improve the grinding efficiency, the number of brush mounting holes 6a provided on the grinding brush sleeve 6 is two, and the two brush mounting holes 6a are arranged vertically. That is, when performing brush pre-grinding, two brushes to be ground 100 can be installed on each grinding brush sleeve 6.

[0037] Combined with Figure 3 And Figure 4As shown, a plurality of positioning grooves 2d are evenly distributed in a ring shape on the bottom surface of the upper ring body 2a, and the positioning grooves 2d are arranged along the radial direction; a positioning protrusion 6b is provided on the top surface of the grinding brush sleeve 6; the positioning protrusion 6b is clamped in the positioning groove 2d, and the upper ring body 2a and the grinding brush sleeve 6 are fixedly connected by a first screw 7, and the first screw 7 passes through the upper ring body 2a from top to bottom and is screwed tightly on the top surface of the grinding brush sleeve 6. By using the structure in which the positioning protrusion 6b cooperates with the positioning groove 2d, a positioning function is achieved, which is beneficial to ensuring the position accuracy after the grinding brush sleeve 6 is assembled.

[0038] Combined with Figure 1 As shown, a counterbore 3a is provided on the top surface of the bottom cover 3. The purpose of setting the counterbore 3a is to hold the particulate matter that falls off after grinding.

[0039] In this embodiment, the pushing device includes a seat body 8 and a push block 9; the seat body 8 includes a bottom plate 8a, a mounting block 8b integrally formed on the top surface of the bottom plate 8a, and a baffle 8c; the baffle 8c is located on the top surface of the outer end of the bottom plate 8a, and a U-shaped opening 8d is formed in the baffle 8c; the push block 9 is slidably inserted into a rectangular hole of the mounting block 8b; the inner end of the push block 9 abuts against the end surface of the brush to be ground 100; the pushing device further includes a power source for providing a radial force to the push block 9. Specifically, the power source is a spring 10; a pull rod 11 is provided on the end surface of the outer end of the push block 9, and the outer end of the pull rod 11 passes out of the U-shaped opening 8d; a handle rod 12 is horizontally inserted into the end head of the outer end of the pull rod 11; the spring 10 is sleeved on the pull rod 11, and the inner end of the spring 10 abuts against the push block 9, and the outer end of the spring 10 abuts against the baffle 8c; the spring 10 is always in a compressed energy storage state, so the spring 10 can generate a radially inward thrust on the push block 9.

[0040] In this embodiment, the seat body 8, the lower ring body 2c, and the bottom cover 3 are fixedly connected by a second screw 14; the second screw 14 passes through the bottom plate 8a and the lower ring body 2c from top to bottom in sequence and is screwed tightly on the bottom cover 3.

[0041] Combined with Figure 1 And Figure 6As shown, a U-shaped limiting groove 9a is formed in the pushing block 9, and the opening of the U-shaped limiting groove 9a faces the grinding brush wheel 1; a limiting pin 15 is horizontally inserted in the mounting block 8b; the limiting pin 15 extends into the limiting groove 9a. During grinding, the pushing block 9 moves radially inwards under the action of the spring 10. When the limiting pin 15 abuts against the bottom of the U-shaped limiting groove 9a, the pushing block 9 reaches the in-place position, indicating that the brush 100 to be ground has been ground in place. Therefore, by using the limiting structure formed by the limiting pin 15 and the limiting groove 9a, it is beneficial to ensure that the grinding amounts of the brushes 100 to be ground are consistent, making the lengths of the processed brushes the same.

[0042] In this embodiment, the upper ring body 2a, the lower ring body 2c, and the connecting rod 2b are integrally formed. Two adjacent connecting rods 2b, the upper ring body 2a, and the lower ring body 2c together enclose a brush grinding opening 2e; specifically, the number of the connecting rods 2b is four, and the four connecting rods 2b are arranged in a circumferential and uniform manner, forming four brush grinding openings 2e. A grinding brush sleeve 6 is arranged at each brush grinding opening 2e; each grinding brush sleeve 6 is correspondingly provided with a pushing device.

[0043] The brush pre-grinding device provided in the first embodiment has the following usage scenario as Figure 8 shown. When in use, the brush pre-grinding device is installed on the partition 18 of the box body 17; the partition 18 divides the inner cavity of the box body 17 into an upper cavity and a lower cavity. A driving motor 19 is installed in the lower cavity, and the connecting shaft 1c on the grinding brush wheel 1 is connected to the output shaft of the driving motor 19. By using the driving motor 19, the grinding brush wheel 1 can be driven to rotate. A dust suction port 20 is formed on the side wall of the upper cavity for connecting a dust purification device to reduce the dust amount in the box body 17.

[0044] In this embodiment, the grinding brush wheel 1 adopts a stainless steel diamond-plated structure, which can improve the grinding efficiency and service life of the grinding brush wheel 1, reduce the pre-grinding time, and avoid frequent replacement of the grinding brush wheel 1 during the grinding process.

[0045] The usage principle of the brush pre-grinding device provided in the first embodiment is as follows:

[0046] First, the operator pulls the pull rod 11 radially outward, overcoming the elastic force of the spring 10, so that the push block 9 slides radially outward in the rectangular hole of the mounting block 8b. At this time, the operator can insert the brush to be ground 100 into the brush mounting hole 6a of the brush grinding sleeve 6. The operator releases the pull rod 11, and under the action of the spring 10, the push block 9 moves radially inward, and then can push the brush to be ground 100 radially inward to provide a pre-pressure for the brush to be ground 100. By using the driving motor 19 to drive the grinding brush wheel 1 to rotate, the brush to be ground 100 can be ground. During the grinding process, the spring 10 always acts on the push block 9, so that the brush to be ground 100 can always abut against the grinding brush wheel 1 for grinding, which is beneficial to ensuring the pre-grinding effect. When the limit pin 15 abuts against the bottom of the U-shaped limit groove 9a, at this time the push block 9 has moved in place, which means that the brush to be ground 100 has been ground in place. Then the driving motor 19 can be turned off. The operator pulls the pull rod 11 radially outward, so that the push block 9 slides radially outward, and the ground brush can be taken out.

[0047] Embodiment 2:

[0048] Combined with Figure 7 As described above, this is the second embodiment of a brush pre-grinding device provided by the present invention. The difference between this Embodiment 2 and Embodiment 1 is only that the power source is a cylinder 13; the cylinder 13 is installed on the baffle 8c; the telescopic rod of the cylinder 13 passes through the U-shaped opening 8d and is connected to the push block 9. The rest of the structure of Embodiment 2 is the same as that of Embodiment 1 and will not be elaborated here.

[0049] The working principle of the brush pre-grinding device provided by this Embodiment 2 is as follows:

[0050] First, by controlling the cylinder 13, the telescopic rod of the cylinder 13 is retracted, thereby driving the push block 9 to slide along the radially outward direction within the rectangular hole of the mounting block 8b. At this time, the operator can insert the brush to be ground 100 into the brush mounting hole 6a of the brush grinding sleeve 6. After the brush to be ground 100 is installed, start the cylinder 13 so that the telescopic rod of the cylinder 13 extends, causing the push block 9 to move radially inward, and then the brush to be ground 100 can be pushed radially inward to provide a pre-pressure for the brush to be ground 100. By using the driving motor 19 to drive the brush grinding wheel 1 to rotate, the brush to be ground 100 can be ground. During the grinding process, the cylinder 13 always acts on the push block 9, so that the brush to be ground 100 can always be abutted against the brush grinding wheel 1 for grinding, which is beneficial to ensuring the pre-grinding effect. When the limit pin 15 abuts against the bottom of the U-shaped limit groove 9a, at this time the push block 9 has moved in place, which means that the brush to be ground 100 has been ground in place. Then the driving motor 19 can be turned off, and by controlling the cylinder 13 to retract its telescopic rod, the push block 9 slides along the radially outward direction, and the ground brush can be taken out.

[0051] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A brush pre-grinding brush device, characterized in that, It includes a grinding brush wheel (1) and a base frame (2); The base frame (2) includes an upper ring body (2a) and a lower ring body (2c) which are arranged at intervals up and down, and the upper ring body (2a) and the lower ring body (2c) are connected by a plurality of connecting rods (2b); a bottom cover (3) is installed on the bottom surface of the lower ring body (2c); The upper journal (1a) on the top surface of the grinding brush wheel (1) is installed in the central hole of the upper ring body (2a) through an upper bearing (4), and the lower journal (1b) on the bottom surface of the grinding brush wheel (1) is installed in the central hole of the bottom cover (3) through a lower bearing (5); a plurality of grinding brush sleeves (6) are annularly and uniformly arranged on the bottom surface of the upper ring body (2a); a brush installation hole (6a) is provided on the grinding brush sleeve (6) for slidably installing the brush to be ground (100); A plurality of pushing devices are annularly and uniformly arranged on the top surface of the lower ring body (2c) for radially pushing the brush to be ground (100) against the outer peripheral surface of the grinding brush wheel (1); A connecting shaft (1c) is integrally formed on the bottom surface of the lower journal (1b), and the connecting shaft (1c) extends downward through the bottom cover (3) for connecting with the output shaft of a driving motor.

2. The brush pre-grinding brush device according to claim 1, characterized in that, The number of the brush installation holes (6a) provided on the grinding brush sleeve (6) is two, and the two brush installation holes (6a) are arranged vertically.

3. The pre-grinding brush device for electric brushes according to claim 1, characterized in that, A plurality of positioning grooves (2d) are annularly and uniformly arranged on the bottom surface of the upper ring body (2a), and the positioning grooves (2d) are arranged along the radial direction; a positioning protrusion (6b) is provided on the top surface of the grinding brush sleeve (6); the positioning protrusion (6b) is clamped in the positioning groove (2d), and the upper ring body (2a) and the grinding brush sleeve (6) are fixedly connected by a first screw (7), and the first screw (7) passes through the upper ring body (2a) from top to bottom and is screwed tightly on the top surface of the grinding brush sleeve (6).

4. A pre-grinding brush device for a carbon brush according to claim 1, characterized in that, A sunk groove (3a) is provided on the top surface of the bottom cover (3).

5. The pre-grinding brush device for a carbon brush according to claim 1, wherein The pushing device includes a seat body (8) and a push block (9); the seat body (8) includes a bottom plate (8a), a mounting block (8b) integrally formed on the top surface of the bottom plate (8a), and a baffle (8c); the baffle (8c) is located on the top surface of the outer end of the bottom plate (8a), and a U-shaped opening (8d) is provided on the baffle (8c); the push block (9) is slidably inserted into the rectangular hole of the mounting block (8b); the inner end of the push block (9) abuts against the end surface of the brush to be ground (100); the pushing device further includes a power source for providing a radial force to the push block (9).

6. The brush pre-grinding brush device according to claim 5, wherein, The power source is a spring (10); a pull rod (11) is provided on the end surface of the outer end of the push block (9), and the outer end of the pull rod (11) passes out of the U-shaped opening (8d); a handle rod (12) is horizontally inserted into the end head of the outer end of the pull rod (11); the spring (10) is sleeved on the pull rod (11), and the inner end of the spring (10) abuts against the push block (9), and the outer end of the spring (10) abuts against the baffle (8c); the spring (10) is always in a compressed energy storage state.

7. The brush pre-grinding brush device according to claim 5, characterized in that, The power source is a cylinder (13); the cylinder (13) is installed on the baffle (8c); the telescopic rod of the cylinder (13) passes through the U-shaped opening (8d) and is connected to the push block (9).

8. The pre-grinding brush device for a carbon brush according to claim 5, wherein, The seat body (8), the lower ring body (2c), and the bottom cover (3) are fixedly connected by a second screw (14); the second screw (14) sequentially passes through the bottom plate (8a) and the lower ring body (2c) from top to bottom and is screwed onto the bottom cover (3).

9. The brush pre-grinding brush device according to claim 5, characterized in that, A U-shaped limit groove (9a) is formed in the push block (9), and the opening of the U-shaped limit groove (9a) faces the grinding brush wheel (1); a limit pin (15) is horizontally inserted into the mounting block (8b); the limit pin (15) extends into the limit groove (9a).

10. A pre-grinding brush device for a carbon brush according to claim 1, characterized in that, The upper ring body (2a), the lower ring body (2c), and the connecting rod (2b) are integrally formed structures, and two adjacent connecting rods (2b) and the upper ring body (2a) and the lower ring body (2c) together enclose a brush grinding port (2e); a grinding brush sleeve (6) is provided at each brush grinding port (2e); each grinding brush sleeve (6) corresponds to one of the pushing devices.

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