Carbon brush on-line polishing device and polishing method thereof

Abstract

The application discloses a carbon brush online polishing device and a polishing method thereof, which comprises a supporting seat, two driven roller sets are respectively installed at the bottom of the supporting seat, a tension roller set is elastically and telescopically installed at the top of the supporting seat, a sand belt is sleeved on the two driven roller sets and the tension roller set, a brush box assembly is installed in the internal space of the sand belt, the brush box assembly comprises a brush box, the brush box is provided with a channel penetrating through the brush box, the channel of the brush box faces the sand belt, and the side of the sand belt used for polishing faces the brush box. The sand belt is driven to rotate through the rotation of the current collector ring, so that the carbon brush can be stably polished online, and the polishing precision of the carbon brush is improved.

Description

Technical Field

[0001] This invention relates to the field of carbon brush polishing tools, and in particular to an online carbon brush polishing device and its polishing method. Background Technology

[0002] The carbon brush-slip ring assembly is the channel for the excitation current of a hydro-generator unit. Current transmission is achieved by maintaining contact between the carbon brush and the slip ring, and the contact state directly affects the stability and reliability of the entire turbine operation. Under normal operating conditions, the carbon brushes and slip rings are prone to wear and tear due to prolonged contact. Periodic replacement of carbon brushes shorter than one-third of their original length is necessary. The contact area between the new carbon brush and the slip ring must be greater than or equal to three-quarters of the contact surface. Since the new carbon brush is cuboid with a flat end face, the contact with the slip ring is a line contact. If the carbon brush contact surface is not ground before installation, the load current passing through each carbon brush will be different, resulting in uneven current distribution, sparking, and carbon brush overheating, ultimately affecting the normal operation of the unit.

[0003] In the prior art, Chinese patent document CN213498344U, published on June 22, 2021, discloses an electric grinding device for carbon brushes of generators in nuclear power plants. The device includes a support frame, a rotor-simulated support frame, a carbon brush box, a large roller, a small roller, a sanding belt, and a drive motor. Its advantages are: it can grind generator carbon brushes; the tool is low-cost and easy to maintain. However, its disadvantages are: the device in this document adapts the curvature of the rotor-simulated support frame to the outer circumference of the slip ring. Due to differences in unit specifications, the diameter of the slip ring varies, and the slip ring also experiences wear after long-term use. Since the curvature of the rotor-simulated support frame is fixed, this device cannot well adapt to the actual conditions on site.

[0004] In addition, Chinese patent document CN222200005U, published on December 20, 2024, discloses an in-situ automatic carbon brush polishing device, including a brush holder formed by a brush box and a constant pressure spring. A carbon brush is installed in the brush box by the constant pressure spring. A polishing mechanism is detachably provided on the brush box. The polishing mechanism includes a pair of fixed mechanisms, which are detachably fixed to the left and right sides of the brush box respectively. Each fixed mechanism is provided with a moving mechanism and a clamping mechanism. The clamping mechanism is linked with the corresponding moving mechanism. A tensioned sandpaper belt is clamped between the clamping mechanisms on both sides. The polishing surface of the sandpaper belt is in close contact with the end of the carbon brush to be polished. Its advantages are: the sandpaper belt's grinding surface and the carbon brush's grinding end are reciprocated through the alternating operation of two moving mechanisms, facilitating in-situ grinding of the carbon brush mounted on the brush holder without disassembling or transferring the carbon brush; its disadvantages are: during grinding, the sandpaper belt needs to be in close contact with the slip ring to match the ring's curvature, but at the same time, the sandpaper belt needs to reciprocate, causing the device to sway left and right following the reciprocating rhythm of the sandpaper belt, resulting in poor grinding accuracy of the carbon brush. Summary of the Invention

[0005] The purpose of this invention is to provide an online carbon brush polishing device and a polishing method. During polishing, the rotation of the slip ring drives the abrasive belt to rotate, thereby enabling stable online polishing of the carbon brush and improving the polishing accuracy of the carbon brush.

[0006] To achieve the above objectives, the present invention provides an online carbon brush polishing device, including a support base, driven roller groups installed at both ends of the bottom of the support base, and a tension roller group installed on the top of the support base in an elastically telescopic manner. An abrasive belt is fitted onto the two driven roller groups and the tension roller group. A brush box assembly is installed in the internal space of the abrasive belt on the support base. The brush box assembly includes a brush box with a through channel. The channel of the brush box faces the abrasive belt, and the side of the abrasive belt used for polishing faces the brush box.

[0007] The support base and the brush box are connected by a positioning and rotating structure. The support base is provided with a positioning screw hole, and the outer side of the brush box is provided with an arc-shaped through groove. The threaded end of the positioning screw passes through the arc-shaped through groove and connects with the positioning screw hole.

[0008] The positioning and rotating structure includes a positioning frustum mounted on a support base and a turntable fixedly mounted on the bottom of the brush box. The bottom of the turntable is provided with a positioning hole, and the turntable is rotatably mounted on the positioning frustum through the positioning hole. The arc-shaped through groove is provided on the turntable.

[0009] The support base is provided with a scale, and the turntable base is provided with a reference point.

[0010] The driven roller assembly includes a driven roller shaft and a driven roller. The driven roller is rotatably mounted on a driven roller shaft, which is mounted on a support base. The driven roller is provided with a first sanding belt groove, and the sanding belt passes around the first sanding belt groove.

[0011] The tensioning roller assembly includes a grooved lug, a tensioning roller shaft, and a tensioning roller. The tensioning roller shaft is mounted on the grooved lug, and the tensioning roller is rotatably mounted on the tensioning roller shaft. The tensioning roller has a second sanding belt groove, and the sanding belt passes through the second sanding belt groove. A guide shaft is fixedly installed at the bottom of the grooved lug, and a guide hole is provided at the top of the support base. The guide shaft is slidably connected to the guide hole. A limit component is installed at one end of the guide shaft that passes through the support base, and a tensioning spring is installed between the support base and the grooved lug on the guide shaft.

[0012] On the support base, movable plates are rotatably mounted at the central axis positions of the corresponding driven roller groups. The movable plates can rotate around the central axis of the driven roller groups. The end of the movable plate near the support base at its rotation center is connected to the support base by a lifting spring. The end of the movable plate away from the support base at its rotation center is mounted with a drive roller shaft. A drive roller is rotatably mounted on the drive roller shaft. The drive roller is provided with a first belt groove, and the driven roller is provided with a second belt groove. Belts are fitted on the first belt groove and the second belt groove of the drive roller and the driven roller on the same side.

[0013] The support base is also equipped with a handle, which is a hollow structure. The handle includes a connected hand-held section and a connecting section. The connecting section is installed and connected to the support base, and the interior of the handle is connected to the internal space. A push assembly is installed inside the handle. The push assembly includes a first connecting rod, a pressing member, a return spring, a second connecting rod, a ball joint, and a push plate. A hinge post is provided in the hand-held section. The middle part of the first connecting rod is hinged to the hinge post. A pressing member is hinged to the end of the first connecting rod away from the connecting section. The pressing member slides and extends out of the hand-held section. One end of the return spring is connected to the first connecting rod, and the other end is connected to the hand-held section. The second connecting rod is located in the connecting section. The other end of the first connecting rod is pivotally hinged to one end of the second connecting rod. The other end of the second connecting rod extends into the internal space and slides through a guide seat fixed on the support base. The guide seat corresponds to the channel of the brush box. A push plate is installed at the end of the second connecting rod located in the internal space through a ball joint. The push plate is used to push the carbon brushes in the brush box.

[0014] The support base is a triangular groove structure with an internal space. Two driven roller sets are respectively installed at the two corners of the bottom of the support base, and a tension roller set is installed at the corner of the top of the support base. The bottom of the support base is open. A cover plate is installed on the open side of the groove of the support base. A dust suction port is provided on the cover plate or the support base.

[0015] A method for online carbon brush polishing, employing the aforementioned online carbon brush polishing device, includes the following steps: S1. Install the carbon brushes that need to be polished into the brush box; S2. Place the two driven roller groups of the grinding device against the rotating slip ring. The slip ring drives the driven roller groups, thereby driving the sanding belt to rotate. At this time, the sanding belt between the two driven roller groups is in close contact with the slip ring, forming an arc surface that protrudes towards the support seat. S3. Push the carbon brush. The head of the carbon brush extends out from the channel of the brush box and abuts against the arc surface of the sanding belt. The head of the carbon brush is polished by the rotation of the sanding belt.

[0016] Compared with the prior art, the present invention has the following technical effects: 1. In this invention, when grinding carbon brushes, the carbon brush to be ground is installed into the brush box of the brush box assembly. The two driven roller groups of the grinding device are pressed against the rotating slip ring. The slip ring drives the driven roller groups, thereby causing the abrasive belt to rotate. At this time, the abrasive belt between the two driven roller groups is in close contact with the slip ring, forming an arc surface convex towards the support seat. Then, the carbon brush is pushed, and the head of the carbon brush extends out from the channel of the brush box and abuts against the arc surface of the abrasive belt. Through the rotation of the abrasive belt, the carbon brush can be stably ground online, improving the grinding accuracy of the carbon brush.

[0017] 2. The support base and brush box of the present invention are connected by a positioning and rotating structure, which facilitates the rotation of the brush box, thereby adjusting the grinding angle of the carbon brush, increasing the contact area, improving the contact state between the carbon brush and the slip ring, and enabling the unit to operate safely and stably.

[0018] 3. In this invention, the active roller and the collector ring make elastic and pressing contact. The active roller rotates with the collector ring and drives the driven roller to rotate through the belt, thereby driving the sanding belt to rotate more stably and preventing the sanding belt from slipping due to insufficient friction between the sanding belt and the collector ring.

[0019] 4. The support base of the present invention is also equipped with a handle, which facilitates holding the grinding device. The handle is a hollow structure, including a connected hand-held section and a connecting section. The connecting section is installed and connected to the support base, and the interior of the handle is connected to the internal space. A push assembly is installed inside the handle. When the pressing element is pressed, the return spring is compressed, and the first connecting rod drives the second connecting rod to move to the left, thereby pushing the carbon brush so that the carbon brush comes into contact with the sanding belt for grinding, making it more convenient to use. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of AA.

[0023] Figure 3 This is a three-dimensional structural diagram of the present invention without the cover plate.

[0024] Figure 4 This is a three-dimensional structural diagram from the bottom view of the present invention.

[0025] Figure 5 This is a partial structural schematic diagram of the support base of the present invention.

[0026] Figure 6 This is a schematic diagram of the bottom structure of the brush box assembly of the present invention.

[0027] Figure 7 This is a schematic diagram of the structure with graduations inside the support base of the present invention.

[0028] Figure label: Carbon brush 1; Support base 10, cover plate 11, internal space 12, positioning frustum 13, countersunk hole 14, positioning screw hole 15, first fixing post 16, scale 17, guide seat 18, guide hole 19; Driven roller assembly 20, driven roller 21, driven roller 22, second belt groove 221, first abrasive belt groove 23 Tensioning roller assembly 30, grooved lug seat 31, tensioning roller shaft 32, tensioning roller 33, second sanding belt groove 331, guide shaft 34, tensioning spring 35, limiting component 36; 40mm sander belt; Brush box assembly 50, brush box 51, box cover 511, turntable base 52, arc-shaped through groove 521, positioning screw 522, positioning round hole 523. Movable plate 60, active roller 61, auxiliary plate 62, second fixed column 63, lifting spring 64; Drive roller 70, first belt groove 71, belt 72; Handle 80, hand grip section 81, hinge post 811, connecting section 82; Push assembly 90, first connecting rod 91, pressing component 92, return spring 93, second connecting rod 94, ball joint 95, push plate 96; 100mm suction port. Detailed Implementation

[0029] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0030] Example 1: See Figure 1-7An online carbon brush polishing device includes a support base 10, with driven roller groups 20 respectively installed at both ends of the bottom of the support base 10, and a tension roller group 30 elastically and telescopically installed at the top. An abrasive belt 40 is fitted on the two driven roller groups 20 and the tension roller group 30. A brush box assembly 50 is installed in the internal space 12 of the abrasive belt 40 in the support base 10. The brush box assembly 50 includes a brush box 51 with a through channel facing the abrasive belt 40. The side of the abrasive belt 40 used for polishing faces the brush box 51, thereby enabling the carbon brush 1 to be polished without wearing the slip ring.

[0031] When using, please refer to Figure 1 The carbon brush 1 to be polished is installed into the brush box 51 of the brush box assembly 50. The two driven roller groups 20 of the polishing device are pressed against the rotating slip ring. The slip ring drives the driven roller groups 20, thereby driving the sanding belt 40 to rotate. At this time, the sanding belt 40 between the two driven roller groups 20 is in close contact with the slip ring, forming an arc surface protruding towards the support base 10. Then, the carbon brush 1 is pushed, and the head of the carbon brush 1 extends out from the channel of the brush box 51 and abuts against the arc surface of the sanding belt 40. Through the rotation of the sanding belt 40, the carbon brush can be stably polished online, improving the polishing accuracy of the carbon brush.

[0032] In this embodiment, see Figure 1 , 5 The driven roller assembly 20 includes a driven roller 21 and a driven roller 22. The driven roller 22 is rotatably mounted on the driven roller shaft 21 via bearings, and the driven roller shaft 21 is mounted on the support base 10. The driven roller 22 is provided with a first sanding belt groove 23, and the sanding belt 40 passes through the first sanding belt groove 23 to limit the sanding belt 40.

[0033] See Figure 2 , 5 The tensioning roller assembly 30 includes a grooved lug 31, a tensioning roller shaft 32, and a tensioning roller 33. The tensioning roller shaft 32 is mounted on the grooved lug 31, and the tensioning roller 33 is rotatably mounted on the tensioning roller shaft 32. The tensioning roller 33 is provided with a second sanding belt groove 331, and the sanding belt 40 passes through the second sanding belt groove 331 and is limited by the second sanding belt groove 33.

[0034] A guide shaft 34 is fixedly installed at the bottom of the groove-shaped ear seat 31, and a guide hole 19 is provided at the top of the support seat 10. The guide shaft 34 is slidably connected to the guide hole 19. A limit member 36 is installed at one end of the guide shaft 34 that passes through the support seat 10. A tension spring 35 is installed between the support seat 10 and the groove-shaped ear seat 31. Through the above structure, the tension roller group 30 can be elastically stretched and contracted, thereby tensioning the sand belt 40.

[0035] Specifically, in this embodiment, see Figure 7The guide hole 19 is a rectangular hole, and correspondingly, the cross-section of the guide shaft 34 is rectangular, thereby realizing the directional sliding connection between the guide shaft 34 and the guide hole 19, preventing the groove ear seat 31 from rotating, ensuring the expansion and contraction stability of the groove ear seat 31, and ensuring that the sanding belt 40 can rotate stably.

[0036] Furthermore, in this embodiment, see Figure 1 , 2 3. The support base 10 has a triangular groove structure and an internal space 12. Two driven roller groups 20 are respectively installed at the two corners of the bottom of the support base 10, and the tension roller group 30 is installed at the corner of the top of the support base 10. The bottom of the support base 10 is open, so that the carbon brush 1 can extend out and contact the sanding belt 40 for grinding.

[0037] See Figure 1 A cover plate 11 is installed on the open side of the groove of the support base 10, and a dust suction port 100 is provided on the cover plate 11 or the support base 10. In use, the dust suction port 100 is connected to a vacuum cleaner to prevent carbon brush powder from overflowing and causing contamination of the slip ring and other electrical components.

[0038] Example 2: Based on Example 1, see Figure 2 , 5 6. The support base 10 and the brush box 51 are connected by a positioning and rotating structure. The support base 10 is provided with a positioning screw hole 15, and the outer side of the brush box 51 is provided with an arc-shaped through groove 521. The threaded end of the positioning screw 522 passes through the arc-shaped through groove 521 and connects with the positioning screw hole 15. The support base 10 and the brush box 51 are connected by a positioning and rotating structure, which facilitates the rotation of the brush box 51 to adjust the grinding angle of the carbon brush 1, for example, the front end of the carbon brush 1 has an 85° bevel angle. After adjustment, the threaded end of the positioning screw 522 is passed through the arc-shaped through groove 521 and connected with the positioning screw hole 15 to fix the brush box 51 and the support base 10.

[0039] Specifically, see Figure 2 , 5 6. The positioning and rotating structure includes a positioning frustum 13 mounted on the support base 10 and a turntable base 52 fixedly mounted on the bottom of the brush box 51. The bottom of the turntable base 52 is provided with a positioning hole 523, through which the turntable base 52 is rotatably fitted onto the positioning frustum 13; an arc-shaped through groove 521 is provided on the turntable base 52. Through the above structure, the brush box 51 can be precisely rotated.

[0040] Further, see Figure 5 The support base 10 is provided with a countersunk hole 14, and the positioning frustum 13 is located at the center of the countersunk hole 14, thereby reducing the thickness of the entire device.

[0041] Furthermore, for easier and more accurate angle adjustment, see [link / reference]. Figure 7 The support base 10 is provided with a scale 17, and the turntable base 52 is provided with a reference point. In this way, when rotating and adjusting the turntable base 52, the angle can be adjusted according to the scale 17 by using the reference point on the turntable base 52 to correspond to the scale 17.

[0042] Example 3: Based on Example 1 or Example 2, see Figure 1 , 3 4. A movable plate 60 is rotatably mounted on the support base 10 at the corresponding central axis position of the driven roller group 20. The movable plate 60 can rotate around the central axis of the driven roller group 20. The end of the movable plate 60 near the support base 10 at its rotation center is connected to the support base 10 through a lifting spring 64. A drive roller shaft 61 is mounted on the end of the movable plate 60 away from the support base 10 at its rotation center. A drive roller 70 is rotatably mounted on the drive roller shaft 61. The drive roller 70 is provided with a first belt groove 71, and the driven roller 22 is provided with a second belt groove 221. A belt 72 is fitted onto the first belt groove 71 and the second belt groove 221 of the drive roller 70 and the driven roller 22 on the same side. Through the elastic and pressing contact between the drive roller 70 and the slip ring, the drive roller 70 rotates with the slip ring, and drives the driven roller 22 to rotate through the belt 72, thereby driving the sanding belt 40 to rotate more stably and preventing the sanding belt 40 from slipping due to insufficient friction between the sanding belt 40 and the slip ring.

[0043] Specifically, see Figure 4 The movable plate 60 has a second fixed post 63 fixed at one end near the support base 10 at its rotation center. The support base 10 has a first fixed post 16 fixed on it. One end of the lifting spring 64 is hooked on the first fixed post 16, and the other end is hooked on the second fixed post 63.

[0044] Further, see Figure 4 One end of the movable plate 60, which is rotatably connected to the support base 10, is mounted on the driven roller 21. An auxiliary plate 62 is also detachably mounted on the upper end of the driving roller 70 and the driven roller 21 to improve the stability of the driving roller 70. The auxiliary plate 62 is located on the upper side of the cover plate 11 and is limited on the driving roller 61 and the driven roller 21 by a nut.

[0045] Example 4: Based on Example 1, Example 2, or Example 3, see [link to example]. Figure 1 , 2 The support base 10 is also equipped with a handle 80, which makes it easy to hold the polishing device.

[0046] Further, see Figure 2The handle 80 is a hollow structure, comprising a connected hand-held section 81 and a connecting section 82. The connecting section 82 is installed and connected to the support base 10, and the interior of the handle 80 is connected to the internal space 12. A push assembly 90 is installed inside the handle 80. The push assembly 90 includes a first connecting rod 91, a pressing element 92, a return spring 93, a second connecting rod 94, a ball joint 95, and a push plate 96. A hinge post 811 is provided inside the hand-held section 81. The middle part of the first connecting rod 91 is hinged to the hinge post 811. The pressing element 92 is hinged to the end of the first connecting rod 91 away from the connecting section 82. The component 92 extends slidably from the handheld section 81. One end of the return spring 93 is connected to the first connecting rod 91, and the other end is connected to the handheld section 81. The second connecting rod 94 is located inside the connecting section 82. The other end of the first connecting rod 91 is pivotally hinged to one end of the second connecting rod 94. The other end of the second connecting rod 94 extends into the internal space 12 and slides through the guide seat 18 fixed on the support base 10. The guide seat 18 corresponds to the channel of the brush box 51. A push plate 96 is installed at the end of the second connecting rod 94 in the internal space 12 through a ball joint 95. The push plate 96 is used to push the carbon brush 1 inside the brush box 51. With the above structure, see Figure 2 When the pressing element 92 is pressed, the return spring 93 is compressed, and the first connecting rod 91 drives the second connecting rod 94 to move to the left, thereby pushing the carbon brush 1 so that it comes into contact with the sanding belt 40 for polishing, making it more convenient to use. The ball joint 95 allows the push plate 96 to be adjusted at any angle to adapt to the adjustment of the brush box 51 angle. When the pressing element 92 is released, the return spring 93 returns to its original position, and the push plate 96 moves to the right to return to its original position.

[0047] Further, see Figure 6 To facilitate the placement of the carbon brush 1 into the brush holder 51, the top of the brush holder 51 is open, and a cover 511 is fitted onto the brush holder 51. Preferably, the cover 511 and the brush holder 51 are detachably connected by a snap-fit ​​structure.

[0048] Example 5: Based on Embodiment 1, Embodiment 2, Embodiment 3, or Embodiment 4, this invention discloses an online carbon brush polishing method. This polishing method employs an online carbon brush polishing device and includes the following steps: S1. Install the carbon brush 1 that needs to be polished into the brush box 51; S2. The two driven roller groups 20 of the grinding device are pressed against the rotating slip ring. The slip ring drives the driven roller groups 20, thereby driving the sanding belt 40 to rotate. At this time, the sanding belt 40 between the two driven roller groups 20 is in close contact with the slip ring, forming an arc surface protruding towards the support seat 10. S3. When the pressing member 92 is pressed, the reset spring 93 is compressed, the first link 91 drives the second link 94 to move to the left, thereby pushing the carbon brush 1. The head of the carbon brush 1 extends out from the channel of the brush box 51 and abuts against the arc surface of the sanding belt 40. The head of the carbon brush 1 is polished by the rotation of the sanding belt 40.

Claims

1. An online carbon brush polishing device, characterized in that: The support base (10) includes a driven roller assembly (20) installed at both ends of the bottom of the support base (10) and a tension roller assembly (30) installed on the top elastically. The sanding belt (40) is fitted on the two driven roller assemblies (20) and the tension roller assembly (30). The support base (10) has a brush box assembly (50) installed in the internal space (12) of the sanding belt (40). The brush box assembly (50) includes a brush box (51) with a through channel. The channel of the brush box (51) faces the sanding belt (40), and the side of the sanding belt (40) used for sanding faces the brush box (51). The support base (10) is also equipped with a handle (80). The handle (80) is a hollow structure. The handle (80) includes a connected hand-holding section (81) and a connecting section (82). The connecting section (82) is installed and connected to the support base (10). The interior of the handle (80) is connected to the interior space (12). A push assembly (90) is installed inside the handle (80). The push assembly (90) includes a first connecting rod (91), a pressing member (92), a return spring (93), a second connecting rod (94), a ball joint (95), and a push plate (96). A hinge post (811) is provided in the hand-held section (81). The middle part of the first connecting rod (91) is hinged to the hinge post (811). The pressing member (92) is hinged to the end of the first connecting rod (91) away from the connecting section (82). The pressing member (92) extends out of the hand-held section (81) in a sliding guide manner. One end of the return spring (93) is connected to the first connecting rod (91), and the other end is connected to the hand-held section (81). The first link (91) is connected to the second link (94), which is located in the connecting section (82). The other end of the first link (91) is pivotally hinged to one end of the second link (94). The other end of the second link (94) extends into the internal space (12) and slides through the guide seat (18) fixed on the support seat (10). The guide seat (18) corresponds to the channel of the brush box (51). The end of the second link (94) located in the internal space (12) is equipped with a push plate (96) through a ball joint (95). The push plate (96) is used to push the carbon brush (1) in the brush box (51).

2. The online carbon brush polishing device according to claim 1, characterized in that: The support base (10) and the brush box (51) are connected by a positioning rotation structure. The support base (10) is provided with a positioning screw hole (15). The outer side of the brush box (51) is provided with an arc-shaped through groove (521). The threaded end of the positioning screw (522) passes through the arc-shaped through groove (521) and connects with the positioning screw hole (15).

3. The online carbon brush polishing device according to claim 2, characterized in that: The positioning and rotating structure includes a positioning frustum (13) set on the support base (10) and a turntable base (52) fixedly installed at the bottom of the brush box (51). The bottom of the turntable base (52) is provided with a positioning hole (523). The turntable base (52) is rotatably fitted onto the positioning frustum (13) through the positioning hole (523). The arc-shaped through groove (521) is set on the turntable base (52).

4. The online carbon brush polishing device according to claim 3, characterized in that: The support base (10) is provided with a scale (17), and the turntable base (52) is provided with a reference point.

5. The online carbon brush polishing device according to claim 1, characterized in that: The driven roller assembly (20) includes a driven roller shaft (21) and a driven roller (22). The driven roller (22) is rotatably mounted on the driven roller shaft (21), and the driven roller shaft (21) is mounted on a support base (10). The driven roller (22) is provided with a first sanding belt groove (23), and the sanding belt (40) passes around the first sanding belt groove (23).

6. The online carbon brush polishing device according to claim 1, characterized in that: The tensioning roller assembly (30) includes a grooved lug (31), a tensioning roller shaft (32), and a tensioning roller (33). The tensioning roller shaft (32) is mounted on the grooved lug (31), and the tensioning roller (33) is rotatably mounted on the tensioning roller shaft (32). A second sanding belt groove (331) is provided on the tensioning roller (33), and the sanding belt (40) passes through the second sanding belt groove (331). A guide shaft (34) is fixedly installed at the bottom of the grooved lug (31), and a guide hole (19) is provided at the top of the support base (10). The guide shaft (34) is slidably connected to the guide hole (19). A limiting member (36) is installed at one end of the guide shaft (34) that passes through the support base (10). A tensioning spring (35) is installed between the support base (10) and the grooved lug (31) on the guide shaft (34).

7. The online carbon brush polishing device according to claim 1 or 5, characterized in that: On the support base (10), a movable plate (60) is rotatably mounted at the position of the central axis of the corresponding driven roller group (20). The movable plate (60) can rotate around the central axis of the driven roller group (20). The movable plate (60) is connected to the support base (10) at one end near the support base (10) at its rotation center by a lifting spring (64). A drive roller shaft (61) is mounted on the end of the movable plate (60) away from the support base (10) at its rotation center. A drive roller (70) is rotatably mounted on the drive roller shaft (61). A first belt groove (71) is provided on the drive roller (70), and a second belt groove (221) is provided on the driven roller (22). A belt (72) is fitted on the first belt groove (71) and the second belt groove (221) of the drive roller (70) and the driven roller (22) on the same side.

8. The online carbon brush polishing device according to claim 1, characterized in that: The support base (10) is a triangular groove structure with an internal space (12). Two driven roller groups (20) are respectively installed at the two corners of the bottom of the support base (10), and a tension roller group (30) is installed at the corner of the top of the support base (10). The bottom of the support base (10) is open. A cover plate (11) is installed on the open side of the groove of the support base (10). A dust suction port (100) is provided on the cover plate (11) or the support base (10).

9. A method for online polishing of carbon brushes, characterized in that: The online carbon brush polishing device according to any one of claims 1 to 8 includes the following polishing methods: S1. Install the carbon brush (1) that needs to be polished into the brush box (51); S2. The two driven roller groups (20) of the grinding device are pressed against the rotating collector ring. The collector ring drives the driven roller groups (20), thereby driving the sand belt (40) to rotate. At this time, the sand belt (40) between the two driven roller groups (20) is in close contact with the collector ring, forming an arc surface protruding towards the support seat (10). S3. Push the carbon brush (1). The head of the carbon brush (1) extends out from the channel of the brush box (51) and abuts against the arc surface of the sanding belt (40). The head of the carbon brush (1) is polished by the rotation of the sanding belt (40).

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