Grinding device for contact end face of carbon brush

Abstract

The utility model relates to the technical field of carbon brush machining, in particular to a carbon brush contact end face grinding device which adopts a felt roller capable of achieving negative pressure adsorption to efficiently remove carbon powder on the surface of an abrasive belt, avoids reduction of the grinding effect of the abrasive belt, keeps the grinding efficiency of the abrasive belt and is good in practicability. Comprising a bottom plate, a rack, a driving wheel, a driven wheel and an abrasive belt. The shaft pipe is rotationally installed on the rack, a cavity is formed in the shaft pipe, a plurality of air suction holes are formed in the outer wall of the shaft pipe, the felt sleeve is arranged on the outer wall of the shaft pipe in a sleeving mode, a large number of holes are formed in the felt sleeve, the abrasive belt is tensioned through the outer wall of the felt sleeve, and the air suction connector is concentrically installed at one end of the shaft pipe; the air exhaust connector is provided with a rotary connector and connected with an air suction port of the air exhauster through a hose, a carbon brush conveying mechanism is installed on the machine frame, and the carbon brush conveying mechanism presses the end of the carbon brush on the abrasive belt above the driven wheel.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon brush processing, in particular to a grinding device for a contact end face of a carbon brush. Background Art

[0002] The carbon brush is an important sliding contact in the excitation system of the generator. It is installed in the brush holder on the brush holder, pressed against the collector ring, and conducts the excitation current to the rotor excitation winding. In the prior art, a variety of grinding devices for the contact end face of the carbon brush are proposed, such as a carbon brush arc surface grinding device proposed in the Chinese utility model patent with the publication number CN220463371U. The grinding device is provided with a first locking member, so that the angle of the second support member relative to the first support member is adjustable. The second support member drives the first placement sleeve, the first mounting member, and the first positioning member to rotate accordingly, so that the position of the first mounting sleeve changes, which is convenient for the staff to operate the carbon brush from different directions for grinding; the first driving member drives the first grinding member to rotate to grind the carbon brush, and the first positioning member has an arc surface, which can determine the arc of the end face of the carbon brush after grinding, and the height of the first positioning member is controlled in combination with the first mounting member, so that the depth of the arc surface ground on the carbon brush is determined, and the arc and depth of the arc surface of the carbon brush can be controlled after the carbon brush is ground, so that the ground carbon brush is in close contact with the collector ring.

[0003] The above-mentioned grinding device uses a sanding belt to grind the contact end face of the carbon brush. Since the surface of the sanding belt is easily contaminated with carbon powder, and the above-mentioned grinding device only relies on the brush to effectively remove the contaminated carbon powder, the residual carbon powder will cause the grinding effect of the sanding belt to drop rapidly, resulting in reduced grinding efficiency. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a grinding device for the carbon brush contact end face which adopts a felt roller capable of negative pressure adsorption to efficiently remove carbon powder on the surface of the sand belt, avoid the reduction of the sand belt grinding effect, maintain the sand belt grinding efficiency, and has good practicality.

[0005] The utility model discloses a grinding device for a carbon brush contact end face, comprising a base plate, a frame, a driving wheel, a driven wheel and an abrasive belt, wherein the frame is mounted on the base plate, the driving wheel and the driven wheel are mounted on the frame, the driven wheel is located above the driving wheel, and the abrasive belt is sleeved on the driving wheel and the driven wheel; the utility model also comprises a shaft tube, a felt sleeve, an air suction joint and an air suction machine, wherein the shaft tube is rotatably mounted on the frame, a cavity is arranged inside the shaft tube, a plurality of air suction holes are arranged on the outer wall of the shaft tube, the felt sleeve is sleeved on the outer wall of the shaft tube, a large number of pores are arranged on the felt sleeve, the outer wall of the felt sleeve tensions the abrasive belt, the air suction joint is concentrically mounted on one end of the shaft tube, a rotating joint is arranged on the air suction joint, the air suction joint is connected to the air suction port of the air suction machine through a hose, a carbon brush conveying mechanism is mounted on the frame, and the carbon brush conveying mechanism presses the end of the carbon brush onto the abrasive belt above the driven wheel; when working, the driving wheel drives the abrasive belt The sanding belt drives the driven wheel to rotate, and the carbon brush is loaded on the carbon brush conveying mechanism. The carbon brush conveying mechanism presses the end of the carbon brush onto the sanding belt above the driven wheel, and the upper part of the driven wheel makes the sanding belt form an arc surface that meets the requirements. The sanding belt on the arc surface grinds the carbon brush, and a part of the ground carbon powder is adhered to the surface of the sanding belt. At the same time, the sanding belt drives the felt sleeve and the shaft tube to rotate, and the vacuum pump runs through the hose and the vacuum joint to extract the air in the cavity of the shaft tube, so that negative pressure is formed in the cavity of the shaft tube, so that the negative pressure absorbs the carbon powder stained on the surface of the sanding belt through a large number of suction holes in the shaft tube and a large number of pores in the felt sleeve, and cooperates with the friction between the felt sleeve and the sanding belt to improve the adsorption effect of the carbon powder, thereby efficiently removing the carbon powder on the surface of the sanding belt, avoiding the decline in the sanding effect of the sanding belt caused by the carbon powder, maintaining the grinding efficiency of the sanding belt, and having good practicality.

[0006] Preferably, it also includes an adsorption box and a vertical pipe, the adsorption box is installed on the base plate, the interior of the adsorption box is filled with adsorption liquid, the vacuum pump is installed on the adsorption box, the air intake of the vacuum pump extends into the interior of the adsorption box and is located above the adsorption liquid, the vertical pipe is installed on the adsorption box, the lower end of the vertical pipe extends into the adsorption liquid, and the upper end of the vertical pipe is connected to the air extraction joint through a hose; the vacuum pump is operated to extract the air above the adsorption liquid in the adsorption box, so that a negative pressure is formed in the upper space of the adsorption box, and the atmospheric pressure presses the air into the adsorption liquid through the pores of the felt sleeve, the air intake holes of the shaft tube, the cavity of the shaft tube, the air extraction joint and the vertical pipe, so that the carbon powder carried in the air is adsorbed by the adsorption liquid, and the air floats out of the adsorption liquid and is extracted by the vacuum pump, thereby realizing the collection of the carbon powder and avoiding damage to the vacuum pump, which has good practicality.

[0007] Preferably, it also includes a dust hopper and an exhaust pipe. The dust hopper is installed on the frame, the inlet of the dust hopper is aligned with the side of the driven wheel, the input end of the exhaust pipe is connected to the interior of the dust hopper, an air filter is arranged at the input end of the exhaust pipe, and the output end of the exhaust pipe is connected to the air intake port of the exhaust fan. A part of the carbon powder generated when the end of the carbon brush is ground by the sand belt is stained on the sand belt, and the other part is thrown into the dust hopper. The exhaust fan draws out the air in the dust hopper through the exhaust pipe, so that a low-pressure area is formed inside the dust hopper to avoid the diffusion of the thrown-in carbon powder to form dust pollution, and the practicality is good.

[0008] Preferably, the carbon brush conveying mechanism includes two driving wheels, a transmission belt and a plurality of carbon brush boxes. The two driving wheels are rotatably installed on the upper part of the frame. The transmission belt is mounted on the two driving wheels. A straight edge on one side of the transmission belt is parallel to the axis of the driven wheel. A plurality of carbon brush boxes are evenly installed on the outer wall of the transmission belt. The plurality of carbon brush boxes are connected up and down. The plurality of carbon brush boxes connected up and down can be inserted with carbon brushes. The two driving wheels drive the transmission belt to rotate, and the transmission belt drives the plurality of carbon brush boxes to rotate, so that the plurality of carbon brush boxes pass over the driven wheel in turn and stay for a period of time, so that the lower end surfaces of the carbon brushes in the plurality of carbon brush boxes are ground in turn, thereby realizing continuous grinding work with good practicality.

[0009] Preferably, it also includes multiple pressure plates, multiple tension springs and multiple limit blocks, the pressure plate is in the shape of a "7", the upper parts of the multiple pressure plates respectively extend into the upper middle parts of the multiple carbon brush boxes, the lower ends of the multiple pressure plates are respectively movably inserted on the outer walls of the multiple carbon brush boxes, one ends of the multiple tension springs are respectively connected to the multiple pressure plates, and the other ends of the multiple tension springs are respectively connected to the multiple carbon brush boxes, the elastic forces of the multiple tension springs respectively pull the multiple pressure plates downward, the multiple limit blocks are respectively installed on the lower parts of the outer walls of the multiple carbon brush boxes, and the multiple limit blocks are respectively located below the lower ends of the multiple pressure plates; after the carbon brush is vertically inserted into the carbon brush box, the upper part of the pressure plate presses the upper end surface of the carbon brush, and the elastic force of the tension spring pulls the pressure plate downward, so that the pressure plate pulls the carbon brush downward, so that the lower end of the carbon brush maintains sufficient pressure with the sanding belt, and the limit block limits the descent of the pressure plate, and when the lower end of the pressure plate contacts the limit block, the grinding is completed, and the practicality is good.

[0010] Preferably, it also includes a support plate, which is installed on the frame and located below the multiple carbon brush boxes. The support plate supports the lower end of the carbon brush, and the support plate is provided with notches above and in front of the driven wheel; the carbon brush is movably inserted in the carbon brush box, and in the process of the multiple carbon brush boxes driving the carbon brush to move, the support plate supports the lower end of the carbon brush to prevent the carbon brush from falling, and when the carbon brush reaches above the driven wheel, the lower end of the carbon brush contacts the sanding belt on the upper part of the driven wheel through the notch of the support plate to achieve grinding of the lower end of the carbon brush, and when the grinding of the carbon brush is completed, the carbon brush moves to the front of the driven wheel and disengages from the driven wheel, so that the carbon brush automatically falls through the notch of the support plate, thereby achieving automatic unloading, which is practical.

[0011] Preferably, a plurality of abrasive belts are arranged side by side, and the mesh sizes of the abrasive belts increase from the back to the front. The above arrangement realizes multi-stage grinding of the contact end of the carbon brush, thereby improving the grinding efficiency and grinding effect.

[0012] Compared with the prior art, the utility model has the following beneficial effects: when working, the driving wheel drives the sanding belt to rotate, the sanding belt drives the driven wheel to rotate, and the carbon brush is loaded on the carbon brush conveying mechanism. The carbon brush conveying mechanism presses the end of the carbon brush on the sanding belt above the driven wheel, and the upper part of the driven wheel makes the sanding belt form an arc surface that meets the requirements, and the sanding belt on the arc surface grinds the carbon brush, and a part of the ground carbon powder is adhered to the surface of the sanding belt, and at the same time, the sanding belt drives the felt sleeve and the shaft tube to rotate, and the vacuum fan runs through the hose and the vacuum joint to extract the air in the cavity of the shaft tube, so that negative pressure is formed in the cavity of the shaft tube, so that the negative pressure absorbs the carbon powder stained on the surface of the sanding belt through a large number of suction holes in the shaft tube and a large number of pores in the felt sleeve, and cooperates with the friction between the felt sleeve and the sanding belt to improve the adsorption effect of the carbon powder, thereby efficiently removing the carbon powder on the surface of the sanding belt, avoiding the decline of the sanding belt grinding effect caused by the carbon powder, maintaining the grinding efficiency of the sanding belt, and having good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a front structural schematic diagram of the utility model;

[0015] Figure 3 It is a schematic diagram of the structure of the bottom plate, frame, driving wheel, driven wheel, sanding belt, shaft tube, felt sleeve and air extraction joint;

[0016] Figure 4 It is a partial cross-sectional structural diagram of the shaft tube, felt sleeve and air extraction joint;

[0017] Figure 5 It is a schematic diagram of the structure of the vacuum pump, adsorption box, vertical pipe, dust hopper and vacuum pipe;

[0018] Figure 6 It is an axonometric structural diagram of the carbon brush conveying mechanism and other structures;

[0019] Figure 7 It is a schematic diagram of the top view of the carbon brush conveying mechanism and other structures;

[0020] Figure 8 It is a structural diagram of structures such as a carbon brush box, a pressure plate, a tension spring and a limit block.

[0021] Markings in the attached figure: 1. base plate; 2. frame; 3. driving wheel; 4. driven wheel; 5. sanding belt; 6. shaft tube; 7. felt sleeve; 8. exhaust joint; 9. vacuum pump; 10. adsorption box; 11. vertical pipe; 12. dust hopper; 13. exhaust pipe; 14. driving wheel; 15. transmission belt; 16. carbon brush box; 17. pressure plate; 18. tension spring; 19. limit block; 20. support plate. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0023] Example 1

[0024] like Figures 1 to 5 As shown, a grinding device for a carbon brush contact end face comprises a base plate 1, a frame 2, a driving wheel 3, a driven wheel 4 and an abrasive belt 5, the frame 2 is mounted on the base plate 1, the driving wheel 3 and the driven wheel 4 are mounted on the frame 2, the driven wheel 4 is located above the driving wheel 3, and the abrasive belt 5 is sleeved on the driving wheel 3 and the driven wheel 4; it also comprises a shaft tube 6, a felt sleeve 7, an exhaust joint 8 and an exhaust fan 9, the shaft tube 6 is rotatably mounted on the frame 2, a cavity is arranged inside the shaft tube 6, a plurality of suction holes are arranged on the outer wall of the shaft tube 6, the felt sleeve 7 is sleeved on the outer wall of the shaft tube 6, a large number of pores are arranged on the outer wall of the felt sleeve 7, the outer wall of the felt sleeve 7 tightens the abrasive belt 5, the exhaust joint 8 is concentrically mounted on one end of the shaft tube 6, the exhaust joint 8 is provided with a rotary joint, the exhaust joint 8 is connected to the suction port of the exhaust fan 9 through a hose, a carbon brush conveying mechanism is mounted on the frame 2, the carbon brush conveying mechanism presses the end of the carbon brush on On the sanding belt 5 above the driven wheel 4; it also includes an adsorption box 10 and a vertical pipe 11, the adsorption box 10 is installed on the base plate 1, the interior of the adsorption box 10 is filled with adsorption liquid, the vacuum pump 9 is installed on the adsorption box 10, the air intake of the vacuum pump 9 extends into the interior of the adsorption box 10 and is located above the adsorption liquid, the vertical pipe 11 is installed on the adsorption box 10, the lower end of the vertical pipe 11 extends into the adsorption liquid, and the upper end of the vertical pipe 11 is connected to the air extraction joint 8 through a hose; it also includes a dust hopper 12 and an exhaust pipe 13, the dust hopper 12 is installed on the frame 2, the inlet of the dust hopper 12 is aligned with the side of the driven wheel 4, the input end of the exhaust pipe 13 is connected to the interior of the dust hopper 12, an air filter is set at the input end of the exhaust pipe 13, and the output end of the exhaust pipe 13 is connected to the air intake of the vacuum pump 9; a plurality of sanding belts 5 are arranged side by side, and the mesh numbers of the plurality of sanding belts 5 increase from back to front.

[0025] During operation, the driving wheel 3 drives the sanding belt 5 to rotate, and the sanding belt 5 drives the driven wheel 4 to rotate. The carbon brush is loaded on the carbon brush conveying mechanism. The carbon brush conveying mechanism presses the end of the carbon brush onto the sanding belt 5 above the driven wheel 4. The upper part of the driven wheel 4 makes the sanding belt 5 form a circular arc surface that meets the requirements, and the sanding belt 5 on the circular arc surface grinds the carbon brush. A part of the carbon powder generated when the sanding belt 5 grinds the end of the carbon brush is thrown into the dust hopper 12, and the vacuum pump 9 extracts the air in the dust hopper 12 through the vacuum pipe 13, so that a low-pressure area is formed inside the dust hopper 12 to prevent the thrown-in carbon powder from diffusing to form dust pollution, and another part of the ground carbon powder is adhered to the surface of the sanding belt 5. At the same time, the sanding belt 5 drives the felt sleeve 7 and the shaft tube 6 to rotate, and the vacuum pump 9 runs to extract the air above the adsorption liquid in the adsorption box 10, so that the upper part of the adsorption box 10 A negative pressure is formed in the internal space, and the air in the cavity of the shaft tube 6 is extracted through the vertical pipe 11, the hose and the exhaust joint 8, so that a negative pressure is formed in the cavity of the shaft tube 6, so that the negative pressure absorbs the carbon powder stained on the surface of the sanding belt 5 through a large number of suction holes of the shaft tube 6 and a large number of pores of the felt sleeve 7, and cooperates with the friction between the felt sleeve 7 and the sanding belt 5 to improve the adsorption effect of the carbon powder. The atmospheric pressure presses the air into the adsorption liquid through the pores of the felt sleeve 7, the suction holes of the shaft tube 6, the cavity of the shaft tube 6, the exhaust joint 8 and the vertical pipe 11, so that the carbon powder carried in the air is adsorbed by the adsorption liquid, and the air floats out of the adsorption liquid and is extracted by the vacuum pump 9, so as to realize the collection of the carbon powder and avoid damage to the vacuum pump 9, thereby efficiently removing the carbon powder on the surface of the sanding belt 5, avoiding the decline of the sanding belt grinding effect caused by the carbon powder, and maintaining the grinding efficiency of the sanding belt 5.

[0026] Example 2

[0027] like Figures 6 to 8As shown, on the basis of Example 1, the carbon brush conveying mechanism includes two driving wheels 14, a transmission belt 15 and a plurality of carbon brush boxes 16, the two driving wheels 14 are rotatably mounted on the upper part of the frame 2, the transmission belt 15 is sleeved on the two driving wheels 14, one side straight edge of the transmission belt 15 is parallel to the axis of the driven wheel 4, and a plurality of carbon brush boxes 16 are evenly mounted on the outer wall of the transmission belt 15, and the plurality of carbon brush boxes 16 are passed through from top to bottom; it also includes a plurality of pressing plates 17, a plurality of tension springs 18 and a plurality of limit blocks 19, the pressing plate 17 is in the shape of a "7", the upper parts of the plurality of pressing plates 17 respectively extend into the upper middle parts of the plurality of carbon brush boxes 16, and the lower parts of the plurality of pressing plates 17 The ends are movably inserted on the outer walls of multiple carbon brush boxes 16, one ends of multiple tension springs 18 are respectively connected to multiple pressure plates 17, and the other ends of multiple tension springs 18 are respectively connected to multiple carbon brush boxes 16. The elastic force of multiple tension springs 18 pulls the multiple pressure plates 17 downward respectively, and multiple limit blocks 19 are respectively installed on the lower parts of the outer walls of multiple carbon brush boxes 16, and the multiple limit blocks 19 are respectively located below the lower ends of the multiple pressure plates 17; it also includes a support plate 20, which is installed on the frame 2 and located below the multiple carbon brush boxes 16. The support plate 20 supports the lower ends of the carbon brushes, and the support plate 20 is provided with notches above and in front of the driven wheel 4.

[0028] The plurality of carbon brush boxes 16 that pass through the upper and lower parts can be inserted with carbon brushes, and the support plate 20 supports the lower end of the carbon brush to prevent the carbon brush from falling. The two driving wheels 14 drive the transmission belt 15 to rotate, and the transmission belt 15 drives the plurality of carbon brush boxes 16 to rotate, so that the plurality of carbon brush boxes 16 pass over the upper part of the driven wheel 4 in sequence and stay for a period of time. When the carbon brush reaches the upper part of the driven wheel 4, the lower end of the carbon brush contacts the sanding belt 5 on the upper part of the driven wheel 4 through the notch of the support plate 20, and the upper part of the pressing plate 17 holds the carbon brush The upper end surface of the pressing plate 17 is pressed, and the elastic force of the tension spring 18 pulls the pressing plate 17 downward, so that the pressing plate 17 pulls the carbon brush downward, so that the lower end of the carbon brush and the abrasive belt 5 maintain sufficient pressure to achieve the grinding of the lower end of the carbon brush, and the limit block 19 limits the descent of the pressing plate 17. When the lower end of the pressing plate 17 contacts the limit block 19, the grinding is completed, and the carbon brush moves to the front of the driven wheel 4 and disengages from the driven wheel 4, so that the carbon brush automatically falls through the gap of the support plate 20 to achieve automatic unloading.

[0029] like Figures 1 to 8As shown, a grinding device for a carbon brush contact end face of the utility model, when working, firstly, the driving wheel 3 drives the sanding belt 5 to rotate, and the sanding belt 5 drives the driven wheel 4 to rotate, and the carbon brush is movably inserted in the carbon brush box 16. In the process of multiple carbon brush boxes 16 driving the carbon brush to move, the support plate 20 supports the lower end of the carbon brush to prevent the carbon brush from falling. Then, when the carbon brush reaches the top of the driven wheel 4, the lower end of the carbon brush contacts the sanding belt 5 on the upper part of the driven wheel 4 through the notch of the support plate 20 to achieve grinding of the lower end of the carbon brush. When the carbon brush grinding is completed, the carbon brush moves to the front of the driven wheel 4 and separates from the driven wheel 4, so that the carbon brush automatically falls through the notch of the support plate 20. The upper part of the driven wheel 4 makes the arc surface formed by the sanding belt 5 grind the carbon brush into an arc surface that meets the requirements. Then, part of the carbon powder generated when the sanding belt 5 grinds the end of the carbon brush is thrown into the dust collecting hopper 12, and the other part is adhered to the surface of the sanding belt 5. When the abrasive belt 5 drives the felt sleeve 7 and the shaft tube 6 to rotate, the vacuum pump 9 runs to extract the air above the adsorption liquid in the adsorption box 10, so that a negative pressure is formed in the upper space of the adsorption box 10, and a negative pressure is formed in the cavity of the shaft tube 6 through the vertical pipe 11 hose and the vacuum joint 8, so that the negative pressure absorbs the carbon powder stained on the surface of the abrasive belt 5 through a large number of suction holes of the shaft tube 6 and a large number of pores of the felt sleeve 7, and cooperates with the friction between the felt sleeve 7 and the abrasive belt 5 to improve the adsorption effect of the carbon powder, and the atmospheric pressure presses the air into the adsorption liquid through the pores of the felt sleeve 7, the suction holes of the shaft tube 6, the cavity of the shaft tube 6, the vacuum joint 8, and the vertical pipe 11, and finally makes the carbon powder carried in the air adsorbed by the adsorption liquid, and the air floats out of the adsorption liquid and is extracted by the vacuum pump 9, thereby efficiently removing the carbon powder on the surface of the abrasive belt 5, avoiding the decline of the abrasive belt grinding effect caused by the carbon powder, and maintaining the grinding efficiency of the abrasive belt 5.

[0030] The main functions achieved by this utility model are:

[0031] 1. Use a felt roller capable of negative pressure adsorption to efficiently remove carbon powder from the surface of the abrasive belt, avoid a decrease in the abrasive belt grinding effect, and maintain the abrasive belt grinding efficiency;

[0032] 2. It can absorb carbon powder dust and reduce dust pollution;

[0033] 3. It can continuously and automatically transport carbon brushes for continuous grinding and automatic unloading.

[0034] The utility model is a carbon brush contact end face grinding device, and its installation method, connection method or setting method are all common mechanical methods, and can be implemented as long as the beneficial effects can be achieved; the driving wheel 3, driven wheel 4, sanding belt 5, shaft tube 6, felt sleeve 7, vacuum joint 8, vacuum fan 9, adsorption box 10, vertical pipe 11, vacuum pipe 13, driving wheel 14, transmission belt 15, and tension spring 18 of the carbon brush contact end face grinding device of the utility model are purchased on the market, and the technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without the need for the technical personnel in this field to pay creative labor.

[0035] All technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A grinding device for a contact end face of a carbon brush, comprising a base plate (1), a frame (2), a driving wheel (3), a driven wheel (4) and an abrasive belt (5), wherein the frame (2) is mounted on the base plate (1), the driving wheel (3) and the driven wheel (4) are mounted on the frame (2), the driven wheel (4) is located above the driving wheel (3), and the abrasive belt (5) is sleeved on the driving wheel (3) and the driven wheel (4); characterized in that: It also comprises a shaft tube (6), a felt sleeve (7), an air suction joint (8) and an air suction machine (9); the shaft tube (6) is rotatably mounted on the frame (2); a cavity is arranged inside the shaft tube (6); a plurality of air suction holes are arranged on the outer wall of the shaft tube (6); the felt sleeve (7) is sleeved on the outer wall of the shaft tube (6); a large number of pores are arranged on the felt sleeve (7); the outer wall of the felt sleeve (7) tightens the sanding belt (5); the air suction joint (8) is concentrically mounted on one end of the shaft tube (6); a rotary joint is arranged on the air suction joint (8); the air suction joint (8) is connected to the air suction port of the air suction machine (9) through a hose; a carbon brush conveying mechanism is mounted on the frame (2); the carbon brush conveying mechanism presses the end of the carbon brush onto the sanding belt (5) above the driven wheel (4).

2. A grinding device for a contact end face of a carbon brush as claimed in claim 1, characterized in that: It also comprises an adsorption box (10) and a vertical pipe (11), wherein the adsorption box (10) is mounted on the bottom plate (1), the interior of the adsorption box (10) is filled with adsorption liquid, the air pump (9) is mounted on the adsorption box (10), the air intake of the air pump (9) extends into the interior of the adsorption box (10) and is located above the adsorption liquid, the vertical pipe (11) is mounted on the adsorption box (10), the lower end of the vertical pipe (11) extends into the adsorption liquid, and the upper end of the vertical pipe (11) is connected to the air extraction joint (8) via a hose.

3. A grinding device for a contact end face of a carbon brush as claimed in claim 1, characterized in that: The machine also comprises a dust collecting hopper (12) and an air extraction pipe (13). The dust collecting hopper (12) is mounted on the frame (2). The inlet of the dust collecting hopper (12) is aligned with the side of the driven wheel (4). The input end of the air extraction pipe (13) is connected to the inside of the dust collecting hopper (12). An air filter is arranged at the input end of the air extraction pipe (13). The output end of the air extraction pipe (13) is connected to the air intake port of the air extractor (9).

4. A grinding device for a contact end face of a carbon brush as claimed in claim 1, characterized in that: The carbon brush conveying mechanism comprises two driving wheels (14), a transmission belt (15) and a plurality of carbon brush boxes (16). The two driving wheels (14) are rotatably mounted on the upper part of a frame (2). The transmission belt (15) is sleeved on the two driving wheels (14). A straight edge on one side of the transmission belt (15) is parallel to the axis of a driven wheel (4). The plurality of carbon brush boxes (16) are evenly mounted on the outer wall of the transmission belt (15). The plurality of carbon brush boxes (16) are connected vertically.

5. A grinding device for a contact end face of a carbon brush as claimed in claim 4, characterized in that: The invention also comprises a plurality of pressing plates (17), a plurality of tension springs (18) and a plurality of limit blocks (19); the pressing plates (17) are in the shape of a letter "7"; the upper parts of the plurality of pressing plates (17) respectively extend into the upper middle parts of the plurality of carbon brush boxes (16); the lower ends of the plurality of pressing plates (17) are respectively movably inserted into the outer walls of the plurality of carbon brush boxes (16); one end of the plurality of tension springs (18) is respectively connected to the plurality of pressing plates (17); the other ends of the plurality of tension springs (18) are respectively connected to the plurality of carbon brush boxes (16); the elastic force of the plurality of tension springs (18) respectively pulls the plurality of pressing plates (17) downward; the plurality of limit blocks (19) are respectively installed at the lower parts of the outer walls of the plurality of carbon brush boxes (16); and the plurality of limit blocks (19) are respectively located below the lower ends of the plurality of pressing plates (17).

6. A grinding device for a contact end face of a carbon brush as claimed in claim 4, characterized in that: The invention also comprises a support plate (20), which is mounted on the frame (2). The support plate (20) is located below a plurality of carbon brush boxes (16). The support plate (20) supports the lower ends of the carbon brushes. The support plate (20) is provided with notches above and in front of the driven wheel (4).

7. A grinding device for a contact end face of a carbon brush as claimed in claim 1, characterized in that: A plurality of abrasive belts (5) are arranged side by side, and the mesh numbers of the plurality of abrasive belts (5) increase sequentially from the back to the front.

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