CN220463469U - Carbon brush grinding device - Google Patents

Abstract

The utility model discloses a carbon brush grinding device. The carbon brush grinding device comprises a grinding assembly and a detection assembly, wherein the grinding assembly comprises a driving motor and a grinding tool, the detection assembly comprises a power supply, a variable resistor and a voltage measuring element, the carbon brush, the variable resistor and the power supply are sequentially communicated, the voltage measuring element is connected in parallel with two ends of the variable resistor, and a movable terminal of the variable resistor is fixedly connected with a carbon brush body. During operation, the grinding tool is driven to rotate through the driving motor, the grinding tool is driven to grind the carbon brush body, the voltage values of the two ends of the variable resistor can be known in real time through the voltage measuring element, and when the voltage values of the two ends of the variable resistor are equal to the voltage values of the two ends of the variable resistor after the carbon brush body reaches the grinding length, the driving motor is stopped to work, so that accurate grinding of the carbon brush body is realized. The carbon brush grinding device can effectively improve the grinding efficiency and the grinding precision of the carbon brush body, prolongs the service life of the carbon brush body and saves the cost.

Description

Carbon brush grinding device

Technical Field

The utility model relates to the technical field of generators, in particular to a carbon brush grinding device.

Background

The generator is a device for converting mechanical energy of a steam turbine into electric energy in a steam turbine generator, and the working principle of the generator is that a stator winding generates induced potential under the cutting of a rotor rotating magnetic field. And after the generator is connected with the grid, the generator converts mechanical energy of the steam turbine into electric energy and outputs the electric energy to a power grid. The process of inputting direct current to the generator rotor winding is called excitation, and currently, two main excitation modes are rotary rectification excitation (brushless excitation) and static rectification excitation (brush excitation). At present, the excitation mode of a large-sized steam turbine generator or a hydraulic generator is static excitation, namely, rectified direct current is transmitted to a generator rotor winding through a carbon brush and a collecting ring device.

The carbon brush in the static rectifying excitation mode is a static part, and the collecting ring is a part which is sleeved on the rotor in a hot mode and rotates along with the rotor at a high speed. Excitation current is transmitted through dynamic electric contact between the carbon brushes and the collecting ring, and each carbon brush is designed to conduct different currents according to different capacities of the machine set. When the contact area of the carbon brush and the collector ring is insufficient or the contact resistance is larger, the contact position of the carbon brush and the collector ring can generate overheat, even a fire accident is caused to damage the generator equipment, and huge loss is brought to a power plant.

Because the carbon brush has wearing and tearing consumption in the use, if carbon brush surplus length is when shorter, can appear carbon brush and collector ring's contact resistance and increase because of the spring pressure is not enough, consequently the power plant need carry out periodic replacement to the carbon brush. After the new carbon brush is replaced, the radian of the new carbon brush is not matched with the collecting ring, and the phenomena of ignition of the carbon brush and the collecting ring can occur in a short time. Therefore, before the new carbon brush is replaced, the arc grinding is generally carried out on the carbon brush by the power plant to ensure that the contact area between the new carbon brush and the collector ring after the installation of the new carbon brush meets the requirement, and the ignition phenomenon of the carbon brush and the collector ring is avoided.

At present, aiming at the grinding of the carbon brush of the generator, maintenance personnel mainly rely on the radian and contact surface of the carbon brush manually ground, and the radian of the carbon brush is identified visually through experience of the maintenance personnel. The grinding method has the advantages that the radian precision of the carbon brush is low, and the carbon brush is in poor contact with the collecting ring after assembly; the carbon brush needs to be manually ground for multiple times, so that the abrasion length of the carbon brush is greatly increased, and the service life of the carbon brush is shortened; the efficiency of the manual abrasion carbon brush is low: the arc degree precision of the carbon brush manually ground by different operators is greatly different due to excessive dependence on experience of maintenance personnel.

Disclosure of Invention

The utility model aims at: the carbon brush grinding device is provided for solving the problems of low efficiency and poor precision of the traditional carbon brush grinding mode.

To achieve the purpose, the utility model adopts the following technical scheme:

a carbon brush grinding device, comprising:

the grinding assembly comprises a driving motor and a grinding tool, wherein the grinding tool is in transmission connection with the output end of the driving motor and is used for grinding the carbon brush body;

the detection assembly comprises a power supply, a variable resistor and a voltage measurement element, wherein the carbon brush, the variable resistor and the power supply are sequentially communicated, the voltage measurement element is connected in parallel with two ends of the variable resistor, and a movable terminal of the variable resistor is fixedly connected with the carbon brush body.

As a preferable solution of the carbon brush grinding device, the carbon brush grinding device further includes a carbon powder collecting assembly, and the carbon powder collecting assembly is connected to the grinding assembly and is used for collecting the ground carbon powder.

As a preferable scheme of the carbon brush grinding device, the carbon brush grinding device further comprises a control assembly, the control assembly comprises a controller, and the driving motor, the voltage measuring element and the carbon powder collecting assembly are all electrically connected with the controller.

As the preferable scheme of the carbon brush grinding device, the carbon brush comprises a carbon brush body and a copper braid fixedly connected with the carbon brush body, the copper braid is communicated with the positive electrode of the power supply through a wire, the negative electrode of the power supply is communicated with the fixed terminal of the variable resistor through a wire, and the movable terminal of the variable resistor is fixedly connected with the carbon brush body.

As the preferable scheme of the carbon brush grinding device, the detection assembly further comprises a current limiting resistor, and the current limiting resistor is arranged on a communication line between the copper braid and the power supply.

As the preferable scheme of the carbon brush grinding device, the detection assembly further comprises a control switch, wherein the control switch is arranged on the communication circuit of the power supply and the copper braid and is used for controlling the connection or disconnection of the communication circuit.

As the preferable scheme of above-mentioned carbon brush grinder, the grinding component still includes the grinding cover, the grinding cover has the chamber of holding, the grinding apparatus set up in hold the intracavity, the through-hole has been seted up at the top of grinding cover, the through-hole with hold the chamber and be linked together, the carbon brush body can pass the through-hole with grinding apparatus butt.

As the preferable scheme of the carbon brush grinding device, the grinding assembly further comprises an insulating plate, wherein the insulating plate is fixedly arranged on the grinding cover, and the variable resistor is fixedly arranged on the insulating plate.

As the preferable scheme of above-mentioned carbon brush grinder, grinding assembly still includes hold-down spring, hold-down spring's stiff end fixed connection in the insulation board, hold-down spring's hold-down end compress tightly in the carbon brush body, hold-down spring be used for with the carbon brush body compress tightly in the grinding apparatus.

The beneficial effects of the utility model are as follows:

the utility model provides a carbon brush grinding device, which specifically comprises a grinding component and a detection component. The grinding assembly comprises a driving motor and a grinding tool, wherein the grinding tool is in transmission connection with the output end of the driving motor and is used for grinding the carbon brush body; the detection assembly comprises a power supply, a variable resistor and a voltage measurement element, wherein the carbon brush, the variable resistor and the power supply are sequentially communicated, the voltage measurement element is connected in parallel with two ends of the variable resistor, and a movable terminal of the variable resistor is fixedly connected to the carbon brush body. During operation, the driving motor drives the grinding tool to rotate so as to drive the grinding tool to grind the carbon brush body, at the initial stage, the movable terminal of the variable resistor is at the initial position, the resistance value of the variable resistor access circuit is zero at the moment, and along with the grinding, the carbon brush body can be continuously ground and moves towards the end close to the grinding tool, so that the movable terminal of the variable resistor fixedly connected with the carbon brush body can synchronously move, and the resistance value of the variable resistor access circuit is gradually increased. The voltage values of the two ends of the variable resistor can be known in real time through the voltage measuring element, and when the voltage values of the two ends of the variable resistor are equal to the voltage values of the two ends of the variable resistor after the carbon brush body reaches the grinding length, the driving motor is stopped to work, so that accurate grinding of the carbon brush body is realized. The carbon brush grinding device can effectively improve the grinding efficiency and the grinding precision of the carbon brush body, prolongs the service life of the carbon brush and saves the cost.

Drawings

Fig. 1 is a schematic structural view of a carbon brush grinding device according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of a portion of a carbon brush polishing device according to an embodiment of the present utility model;

fig. 3 is a schematic diagram of a portion of a carbon brush polishing device according to an embodiment of the utility model;

fig. 4 is a flowchart of a carbon brush polishing method according to an embodiment of the present utility model;

fig. 5 is a schematic diagram of a wear length of a carbon brush body according to a carbon brush polishing method according to an embodiment of the utility model.

In the figure:

100. a carbon brush body; 101. copper braids;

11. a driving motor; 12. grinding tool; 13. a polishing cover; 131. a rotating shaft; 132. a bearing seat; 14. an insulating plate; 141. a bolt; 15. a compression spring; 16. a limit frame; 17. a work table;

21. a power supply; 22. a variable resistor; 221. a moving terminal; 222. a fixed terminal; 23. a voltage measuring element; 24. a current limiting resistor; 25. a control switch;

3. a carbon powder collection assembly;

41. and a controller.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

As shown in fig. 1 to 3, an embodiment of the present utility model provides a carbon brush grinding device, which specifically includes a grinding assembly, a detecting assembly, a carbon powder collecting assembly 3, and a control assembly.

As shown in fig. 1, in particular, the grinding assembly includes a drive motor 11, a grinding tool 12, a table 17, and a grinding cover 13. Wherein, driving motor 11 and grinding cover 13 all install on workstation 17, and grinding cover 13 has and holds the chamber, and grinding apparatus 12 sets up in holding the intracavity, and grinding apparatus 12 is connected with driving motor 11's output transmission, and grinding apparatus 12 is used for grinding carbon brush body 100, and the through-hole has been seted up at grinding cover 13's top, and the through-hole is linked together with holding the chamber, and carbon brush body 100 can pass through the through-hole and grinding apparatus 12 butt. More specifically, the grinding tool 12 is rotatably disposed in the accommodating chamber through a rotation shaft 131, one end of the rotation shaft 131 is in transmission connection with the output shaft of the driving motor 11 through a coupling, and the other end of the rotation shaft 131 is connected with a bearing housing 132 fixed to the grinding cover 13. During operation, the rotating shaft 131 is driven to rotate through the driving motor 11, the rotating shaft 131 synchronously drives the grinding tool 12 to rotate, the grinding tool 12 is further enabled to grind the carbon brush body 100, the bearing seat 132 is arranged to enable the rotating shaft 131 to rotate more smoothly, the problem of clamping and stopping cannot occur, and the grinding effect of the carbon brush body 100 is guaranteed.

The outer contour and dimensions of the grinding tool 12 are matched to those of the slip ring. Thus, the arc of the carbon brush body 100 after grinding can be perfectly matched with the arc of the slip ring.

As shown in fig. 1 to 3, specifically, the detection assembly includes a power source 21, a variable resistor 22, and a voltage measuring element 23, the carbon brush, the variable resistor 22, and the power source 21 are sequentially connected, the voltage measuring element 23 is connected in parallel to two ends of the variable resistor 22, and a moving terminal 221 of the variable resistor 22 is fixedly connected to the carbon brush body 100. More specifically, the carbon brush includes a carbon brush body 100 and a copper braid 101 fixedly connected to the carbon brush body 100, the copper braid 101 is connected to a positive electrode of the power source 21 through a wire, a negative electrode of the power source 21 is connected to a fixed terminal 222 of the variable resistor 22 through a wire, and a movable terminal 221 of the variable resistor 22 is fixedly connected to the carbon brush body 100. In detail, in the initial stage, the moving terminal 221 of the variable resistor 22 is at the initial position, at this time, the resistance value of the variable resistor 22 connected to the circuit is zero, and as the grinding proceeds, the carbon brush body 100 is continuously ground and moves toward the end close to the grinding tool 12, so that the moving terminal 221 of the variable resistor 22 fixedly connected to the carbon brush body 100 moves synchronously, and the resistance value of the variable resistor 22 connected to the circuit gradually increases. According to the length value of the carbon brush body 100 to be ground and the voltage dividing principle of the circuit, the voltage values of the two ends of the variable resistor 22 after the carbon brush body 100 reaches the grinding length can be known, the voltage values of the two ends of the variable resistor 22 can be known in real time through the voltage measuring element 23, and when the voltage values of the two ends of the variable resistor 22 are equal to the voltage values of the two ends of the variable resistor 22 after the carbon brush body 100 reaches the grinding length, the driving motor 11 is stopped to work, so that the carbon brush body 100 is precisely ground.

Alternatively, in the present embodiment, the voltage measuring element 23 may be an electronic voltmeter.

It should be noted that, for the connection arrangement of the circuit, one end of the voltage measurement element 23 is connected with the copper braid 101, and the other end is connected with the fixed terminal 222 of the variable resistor 22, and since the resistance value of the variable resistor 22 is far greater than that of the carbon brush body 100, the influence of the carbon brush body 100 on the voltage values at two ends of the variable resistor 22 can be ignored, so that the grinding of the carbon brush body is more accurate. Further, in the present embodiment, the principle of the variable resistor 22 is similar to that of the sliding rheostat, and the moving terminal 221 of the variable resistor 22 moves along with the carbon brush body 100, thereby changing the resistance value of the variable resistor 22 connected to the circuit.

As shown in fig. 1, the detection assembly further includes a current limiting resistor 24, where the current limiting resistor 24 is disposed on a communication line between the copper braid 101 and the power source 21. The current limiting resistor 24 is used for limiting the current in the circuit so as to prevent the components from being burnt out due to overlarge current when the power supply 21 is turned on, and meanwhile, the current limiting resistor 24 also plays a role in voltage division.

As shown in fig. 1, further, the detection assembly further includes a control switch 25, the control switch 25 is disposed on the connection circuit between the copper braid 101 and the power source 21, and the control switch 25 is used for controlling the connection circuit to be turned on or turned off. Specifically, in this embodiment, the control switch 25 is a push button switch, and the state of the push button switch can be switched by pressing.

As shown in fig. 2 and 3, the grinding assembly preferably further includes an insulating plate 14, the insulating plate 14 being fixedly mounted on the grinding cover 13, and the variable resistor 22 being fixedly mounted on the insulating plate 14. In detail, a threaded hole is formed in the insulating plate 14, a bolt 141 is in threaded connection with the threaded hole, a U-shaped card is connected to one end of the copper braid 101 away from the carbon brush body 100, and the U-shaped card and a wire can be fixedly connected to the insulating plate 14 by screwing the bolt 141, so that the copper braid 101 is communicated with a circuit of the positive electrode of the power supply 21. Through setting up the bolt 141 can be with the quick access of carbon brush and communicate detection circuitry, after a carbon brush grinds, can change and new carbon brush grinds fast to the efficiency that carbon brush body 100 ground has been promoted.

As shown in fig. 2, further, the grinding assembly further includes a limiting frame 16, the limiting frame 16 is fixedly mounted at a through hole of the grinding cover 13, the carbon brush body 100 and the insulating plate 14 are both mounted in the limiting frame 16, and the limiting frame 16 is used for preventing the carbon brush body 100 and the insulating plate 14 from deflecting during grinding, so as to ensure the grinding accuracy of the carbon brush body 100. Further, a magnetic member is fixedly connected to one end of the insulating plate 14, which is close to the grinding cover 13, and the limiting frame 16 is made of magnetic metal, so that the insulating plate 14 is fixedly connected to the limiting frame 16 through magnetic attraction between the magnetic member and the limiting frame 16.

As shown in fig. 1 and 2, it is further preferable that the grinding assembly further includes a compression spring 15, a fixed end of the compression spring 15 is fixedly connected to the insulating plate 14, a compression end of the compression spring 15 is compressed to the carbon brush body 100, and the compression spring 15 is used for compressing the carbon brush body 100 to the grinding tool 12. In this embodiment, a torsion spring is selected as the compression spring 15, and the carbon brush body 100 is compressed on the grinding tool 12 by the elastic restoring force of the torsion spring, so as to ensure the grinding effect of the carbon brush body 100.

As shown in fig. 1, specifically, the toner collection assembly 3 is connected to the grinding assembly, and the toner collection assembly 3 is used for collecting the ground toner. The carbon brush collecting assembly comprises a suction fan, a dust collection pipe and a dust collection box, wherein the suction fan is arranged outside the grinding cover 13 and is communicated with the accommodating cavity, the suction fan is communicated with one end of the dust collection pipe, the other end of the dust collection pipe is communicated with the dust collection box, and the dust collection box is used for collecting carbon powder ground by the carbon brush. Carbon powder can be quickly collected through the carbon powder collecting assembly 3, and the danger caused by the excessive concentration of the carbon powder in the grinding cover 13 is avoided.

As shown in fig. 1, in particular, the control assembly includes a controller 41, and the drive motor 11, the voltage measuring element 23, and the toner collection assembly 3 are all electrically connected to the controller 41. Before starting the grinding, setting relevant parameters in the controller 41 to further obtain voltage values at two ends of the variable resistor 22 after the carbon brush body 100 reaches the grinding length, namely, setting termination voltage values at two ends of the variable resistor 22 in advance, starting the driving motor 11 through the controller 41 to drive the grinding tool 12 to grind the carbon brush body 100, collecting the ground carbon powder through the carbon powder collecting assembly 3, transmitting voltage value information at two ends of the variable resistor 22 to the controller 41 in real time by the voltage measuring element 23 in the grinding process, and controlling the driving motor 11 and the carbon powder collecting assembly 3 to stop working by the controller 41 when the voltage values at two ends of the variable resistor 22 are equal to the set termination voltage values. Thus, the grinding length of the carbon brush body 100 can be precisely controlled by the controller 41, and the grinding efficiency and the grinding effect of the carbon brush body 100 are improved.

As shown in fig. 4 to 5, the embodiment of the present utility model further provides a carbon brush polishing method, which is applied to the carbon brush polishing device, and specifically includes:

s200, calculating the length value of the carbon brush body 100 to be worn according to the parameters of the carbon brush body 100 and the parameters of the grinding tool 12.

Specifically, the specific steps for calculating the length value of the carbon brush body 100 to be worn according to the parameters of the carbon brush body 100 and the parameters of the grinding tool 12 include:

the width value of the carbon brush body 100 and the outer diameter value of the grinding tool 12 are set, and the length value of the carbon brush body 100 required to be worn is calculated according to the width value of the carbon brush body 100 and the outer diameter value of the grinding tool 12.

In detail, the equation for calculating the length value of the carbon brush body 100 that needs to be worn is as follows, as shown in fig. 5, assuming that the width value of the carbon brush body 100 is D, the length value of the carbon brush body 100 is L, and the outer diameter of the grinder 12 is D, then in order to make the arc of the carbon brush body 100 and the grinder 12 identical, the length value Δl of the carbon brush body 100 that needs to be worn is:

ΔL＝(D/2)-√(D/2)^2-(d/2)^2

and S300, calculating the voltage values of the two ends of the variable resistor 22 after the carbon brush body 100 reaches the abrasion length according to the length value of the carbon brush body 100 to be abraded.

The voltage values at the two ends of the variable resistor 22 after the carbon brush body 100 wears Δl can be obtained according to the voltage division principle knowledge of the circuit. The specific derivation formula is mature prior art, so that no further description is given.

S400, monitoring and transmitting the voltage values of the two ends of the variable resistor 22 in real time, and judging whether to stop grinding the carbon brush body 100 according to the voltage values of the two ends of the variable resistor 22.

More specifically, the specific steps of monitoring and transmitting the voltage values of the two ends of the variable resistor 22 in real time, and determining whether to control to stop grinding the carbon brush body 100 according to the voltage values of the two ends of the variable resistor 22 include:

judging whether the voltage values at two ends of the variable resistor 22 are larger than the voltage values at two ends of the variable resistor 22 after the carbon brush body 100 reaches the abrasion length, if so, controlling the driving motor 11 to stop, controlling the carbon powder collecting assembly 3 to stop, and if not, continuously controlling the driving motor 11 to drive the grinding tool 12, and controlling the carbon powder collecting assembly 3 to collect carbon powder.

As an alternative, the drive motor 11 is controlled to stop grinding by setting the grinding time. In detail, the polishing rate of the polishing tool 12, that is, the length of the carbon brush body 100 that can be worn in a unit time, can be obtained according to the length of the carbon brush body 100 that needs to be worn, and the time required for polishing can be obtained according to the length of the carbon brush body 100 that needs to be worn.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (9)

1. A carbon brush grinding device, characterized by comprising:

the grinding assembly comprises a driving motor (11) and a grinding tool (12), wherein the grinding tool (12) is in transmission connection with the output end of the driving motor (11), and the grinding tool (12) is used for grinding the carbon brush body (100);

the detection assembly comprises a power supply (21), a variable resistor (22) and a voltage measurement element (23), wherein the carbon brush, the variable resistor (22) and the power supply (21) are sequentially communicated, the voltage measurement element (23) is connected in parallel with two ends of the variable resistor (22), and a movable terminal (221) of the variable resistor (22) is fixedly connected to the carbon brush body (100).

2. The carbon brush grinding device according to claim 1, further comprising a carbon powder collection assembly (3), wherein the carbon powder collection assembly (3) is connected to the grinding assembly for collecting the ground carbon powder.

3. The carbon brush grinding device according to claim 2, further comprising a control assembly including a controller (41), wherein the driving motor (11), the voltage measuring element (23) and the carbon powder collecting assembly (3) are electrically connected to the controller (41).

4. The carbon brush grinding device according to claim 1, wherein the carbon brush comprises a carbon brush body (100) and a copper braid (101) fixedly connected with the carbon brush body (100), the copper braid (101) is communicated with the positive electrode of the power supply (21) through a wire, the negative electrode of the power supply (21) is communicated with a fixed terminal (222) of the variable resistor (22) through a wire, and a movable terminal (221) of the variable resistor (22) is fixedly connected with the carbon brush body (100).

5. The carbon brush grinding device according to claim 4, wherein the detecting assembly further includes a current limiting resistor (24), and the current limiting resistor (24) is disposed on a communication line between the copper braid (101) and the power source (21).

6. The carbon brush grinding device according to claim 4, wherein the detecting assembly further comprises a control switch (25), the control switch (25) is disposed on a communication circuit between the power source (21) and the copper braid (101), and the control switch (25) is configured to control on or off of the communication circuit.

7. The carbon brush grinding device according to claim 1, wherein the grinding assembly further comprises a grinding cover (13), the grinding cover (13) is provided with a containing cavity, the grinding tool (12) is arranged in the containing cavity, a through hole is formed in the top of the grinding cover (13), the through hole is communicated with the containing cavity, and the carbon brush body (100) can pass through the through hole to be abutted to the grinding tool (12).

8. The carbon brush grinding device according to claim 7, wherein the grinding assembly further comprises an insulating plate (14), the insulating plate (14) is fixedly mounted on the grinding cap (13), and the variable resistor (22) is fixedly mounted on the insulating plate (14).

9. The carbon brush grinding device according to claim 8, wherein the grinding assembly further comprises a pressing spring (15), a fixed end of the pressing spring (15) is fixedly connected to the insulating plate (14), a pressing end of the pressing spring (15) is pressed against the carbon brush body (100), and the pressing spring (15) is used for pressing the carbon brush body (100) against the grinding tool (12).