Contact line polishing maintenance trolley

Abstract

The invention discloses a contact line polishing and maintaining trolley which can automatically grind and polish a contact line and improve the operation efficiency. The device comprises a rack, a walking mechanism, a grinding mechanism and a power supply control module, the walking mechanism comprises walking wheels arranged on the two sides of the upper end of the interior of the rack, and annular flanges are arranged on the peripheral faces of the walking wheels. During working, the ends of the walking wheels are located in the sliding grooves in the side portions of the busbar, and the annular flanges are matched with the side faces of the sliding grooves to form limiting. The polishing mechanism comprises at least one polishing wheel; the grinding wheel is in transmission connection with the motor and is driven by the motor to rotate to grind and polish the surface of the contact line; a brake structure is arranged above the walking wheels and used for adjusting the sliding speed of the polishing maintenance trolley on the busbar. The grinding wheel is connected with the pressure compensation structure and used for enabling the grinding wheel to continuously apply constant pressure to the contact line, then it is guaranteed that the contact force between the contact line and the grinding wheel is always within a reasonable range, and the polishing precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of rail transit contact line maintenance, and in particular to a contact line polishing and maintenance trolley. Background Art

[0002] The rigid contact network is an important part of the urban rail power supply system. It clamps the contact wire in the busbar. The electric passenger car directly contacts the contact wire through the pantograph to obtain current to achieve the purpose of power supply. In actual operation, there are often problems such as poor elasticity in the local section of the rigid contact network, high wear rate of the contact wire, uneven wear, and irregular wear of the carbon slide plate of the pantograph of the electric passenger car. These problems will lead to the deterioration of the bow-net relationship and affect the safety of the bow-net operation. It may not only cause interruption of operation, but also cost the operating company a lot of operating costs to replace the carbon slide plate and contact wire. It is understood that many urban subway lines in China have successively experienced abnormal wear of the bow-net. The fundamental reason is that the coupling relationship between the rigid contact network and the bow-net has suddenly changed. The friction surface of the carbon slide plate and the contact wire has become rough, similar to the friction between two files. At the same time, there are debris after wear between the two friction surfaces, resulting in abrasive wear. The main wear between the bow and the net is transformed from electrical wear to mechanical wear, and the wear rate increases nearly 100 times. In severe cases, a set of carbon slide plates needs to be replaced every two days. At the same time, the contact line is accompanied by uneven wear such as burrs, burns and corrugation.

[0003] The measures to prevent and deal with abnormal bow-net wear are to reduce the friction coefficient of the two friction surfaces through manual intervention, reduce abrasive wear, restore the smooth state between the two friction surfaces, and restore the self-lubricating function between the bow and the net. From the perspective of the contact network, the most effective, fastest and most economical way is to grind and polish the contact line and rebuild a good bow-net coupling relationship. The traditional method is to use hand-made sandpaper or hand-held polishing machine to grind and polish the contact line along the line direction, which has the following defects and shortcomings: (1) A lot of manpower is required for grinding, and the labor cost is high; (2) The burrs generated by the contact line may scratch the operators, posing a safety hazard, and the large amount of metal particles and dust generated during the grinding process will also seriously damage the health of the operators; (3) The hand-held polishing machine needs to be in direct contact with the contact line. If it is not operated properly, it will not only cause damage to the surface of the contact line, but also cause personal injury; (4) During grinding, the operator needs to control the grinding direction and strength at all times. Long-term continuous grinding consumes a lot of physical energy of the operator, and the grinding quality cannot be guaranteed. After grinding, it is still very rough in the microscopic state, which has disadvantages; (5) In order to improve the grinding quality, it is necessary to use hand-made sandpaper or polishing machine for reciprocating operation, which leads to long operation time and greatly reduced efficiency, and it is impossible to repair the contact network in a timely and comprehensive manner. Summary of the invention

[0004] The present invention provides a contact line polishing and maintenance trolley to overcome the above-mentioned problems existing in the prior art. The contact line polishing and maintenance trolley of the present invention is provided with a running wheel and a grinding wheel. When in use, the running wheel is installed on the bus of the rigid contact network, and the grinding wheel rotates under the drive of the motor and rubs against the surface of the contact line, thereby driving the polishing and maintenance trolley to automatically move forward on the bus, realizing the automatic polishing of the contact line, improving the working efficiency, reducing the labor cost, and reducing the working risk; moreover, the polishing and maintenance trolley of the present application is also equipped with a braking structure and a pressure compensation structure, wherein the braking structure is used to adjust the sliding speed of the polishing and maintenance trolley so that the trolley slides smoothly on the bus, and the pressure compensation structure is used to make the grinding wheel continuously apply constant pressure to the contact line, thereby ensuring that the contact force between the contact line and the grinding wheel is always within a reasonable range, thereby improving the polishing accuracy of the contact line.

[0005] The technical solution of the present application is: a contact line polishing and maintenance trolley, comprising a frame, a walking mechanism, a grinding mechanism and a power control module; the walking mechanism comprises walking wheels arranged on both sides of the upper end of the frame; an annular flange is arranged on the outer peripheral surface of the walking wheel; when working, the end of the walking wheel is located in the slide groove on the side of the bus, and the annular flange cooperates with the edge of the bus to form a limit; the grinding mechanism comprises at least one grinding wheel; the grinding wheel is connected to the motor transmission, driven by the motor to rotate, and the contact line surface is polished; a braking structure is arranged above the walking wheel; the braking structure comprises a brake pad and a brake rod; a groove matched with the braking surface of the walking wheel is provided at the bottom of the brake pad; a balance rod slidably connected to the frame is respectively provided at the two ends of the top of the brake pad; an A spring is provided on the outer sleeve of the balance rod, one end of the A spring is connected to the head of the balance rod, and the other end is connected to the top of the frame; the brake rod is arranged between the two balance rods, and one end of the A spring passes through the frame and abuts against the top of the brake pad; the brake rod is connected to the frame by threads; the grinding wheel is connected to the pressure compensation structure; the pressure compensation structure is used to enable the grinding wheel to maintain a stable pressure on the contact line during the grinding and polishing process.

[0006] Compared with the prior art, the contact line polishing and maintenance trolley of the present application has achieved the following beneficial effects:

[0007] (1) The device is provided with a travel wheel and a grinding wheel. When in use, the travel wheel is installed on the busbar of the rigid contact network to guide the travel trajectory and direction of the device and ensure that the device remains stable during operation. When the grinding wheel rotates under the drive of the motor, it will rub against the surface of the contact line, thereby driving the travel wheel to slide on the busbar, so that the polishing and maintenance trolley automatically moves forward on the busbar, realizing automatic polishing of the contact line, improving operation efficiency, and reducing labor costs. In addition, the operator only needs to monitor the operation status of the equipment without directly touching the contact line, which effectively reduces the safety hazards in the operation process and makes the contact line maintenance work safer and more convenient.

[0008] (2) A brake structure is provided above the traveling wheel. When in use, the sliding speed of the polishing and maintenance trolley on the busbar can be changed by adjusting the fastening force of the brake pad on the traveling wheel to ensure the smooth sliding of the trolley, so that the grinding wheel can effectively remove impurities on the surface of the contact line and improve the polishing quality of the contact line;

[0009] (3) The grinding wheel is connected to the pressure compensation structure, which can continuously apply constant pressure to the contact line during use, thereby ensuring that the contact force between the contact line and the grinding wheel is always within a reasonable range, making the polishing force more uniform and stable, avoiding the problem of poor polishing effect caused by unstable pressure, improving the consistency and accuracy of polishing, and ensuring the flatness and smoothness of the contact line surface.

[0010] As an optimization, in the aforementioned contact line polishing and maintenance trolley, the pressure compensation structure includes a torsion spring and an inclined adjustment plate; the axle of the grinding wheel passes through the adjustment plate and is connected to the output shaft of the motor; the torsion spring is sleeved on the torsion spring shaft, and the two ends of the torsion spring are at a certain angle and are respectively fixed on the A pin and the B pin; the two ends of the adjustment plate are respectively connected to the two ends of the motor mounting plate through the A pin and the C pin; the C pin is fixed on the frame, and the A pin is slidably connected to the frame; the torsion spring shaft and the B pin are fixed on the frame; the axle of the grinding wheel is rotatably connected to the adjustment plate. The pressure compensation structure adopts the above-mentioned structure, which is easy to assemble and easy to implement. Since the degree of wear at different positions of the contact line is different, the contact force between the contact line and the grinding wheel is different, so the pressure of the grinding wheel on the contact line will be different; after setting the torsion spring, the elastic force of the torsion spring itself can be relied on to automatically compensate for the pressure applied by the grinding wheel on the contact line, which is easy to adjust and has high reliability.

[0011] As an optimization, in the aforementioned contact line polishing and maintenance trolley, a self-tightening chuck is provided on the output shaft of the motor; the axle of the grinding wheel is fixed in the self-tightening chuck. At this time, the contact position between the grinding wheel and the contact line can be adjusted by adjusting the depth of the grinding wheel axle entering the self-tightening chuck, which is convenient to operate and also convenient for the later maintenance and replacement of the grinding wheel.

[0012] As an optimization, in the aforementioned contact line polishing and maintenance trolley, a camera is provided at each end of the frame, and correspondingly, two display screens matching the cameras are provided on the frame; the two cameras are used to monitor the line surface state of the contact line before and after polishing, and display it through the corresponding display screens. During polishing, the staff can observe the polishing effect of the contact line in real time through the display screen. If the polishing effect is not good, turn off the motor, remove the trolley, and adjust the contact position between the grinding wheel and the contact line (i.e., change the grinding surface of the grinding wheel).

[0013] As an optimization, in the aforementioned contact line polishing and maintenance trolley, a buckle sleeve is provided on the frame corresponding to the travel wheel one by one; a locking rod is slidably provided in the buckle sleeve; the end of the locking rod passes through the frame and is inserted into the travel wheel; the travel wheel is rotatably connected with the locking rod; a clamping column is provided on the locking rod, and correspondingly, a clamping groove matching the clamping column is provided on the buckle sleeve; a B spring is provided on the outer sleeve of the locking rod; one end of the B spring is connected to the head of the locking rod, and the other end is connected to the outer end surface of the buckle sleeve. At this time, the travel wheel can be clamped on the edge of the busbar's slide slot, or detached from the busbar's slide slot by rotating the locking rod, and the disassembly and assembly are more flexible.

[0014] As an optimization, in the aforementioned contact line polishing and maintenance trolley, the bottom of the frame is connected to a debris collection frame in a drawer-type manner. The arrangement of the debris collection frame allows the contact line burrs and dust generated during the polishing process to fall into the debris collection frame and be collected, thereby avoiding the splashing of the contact line burrs and dust to cause environmental pollution and damage the health of the operators.

[0015] As an optimization, in the aforementioned contact line polishing and maintenance trolley, the frame includes two oppositely arranged side panels; the two ends of the two side panels are respectively connected by mounting plates, and a group of support rods are also provided between the two side panels. The frame adopts the above-mentioned structure, which is simple in structure and easy to implement. Furthermore, the power control module and the motor are respectively arranged on the outside of the two side panels, and the outside of the power control module and the motor are respectively provided with protective shells to prevent the power control module and the motor from being contaminated by external dust. Furthermore, the protective shell is provided with ventilation shutters to facilitate the heat dissipation of the power control module and the motor.

[0016] As an optimization, in the aforementioned contact line polishing and maintenance trolley, two walking wheels are respectively provided on both sides of the upper end of the frame; and three grinding wheels are provided on the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the contact line polishing and maintenance trolley in an embodiment of the present application;

[0018] Figure 2yes Figure 1 Left side view of the contact line polishing maintenance trolley (protective shell removed);

[0019] Figure 3 yes Figure 2 AA section view in the figure;

[0020] Figure 4 It is a schematic diagram of the assembly of the pressure compensation structure and the frame side plate in the embodiment of the present application;

[0021] Figure 5 It is a schematic diagram of the assembly of the motor and the frame side plate in the embodiment of the present application;

[0022] Figure 6 It is a structural schematic diagram of the walking mechanism in the embodiment of the present application;

[0023] Figure 7 is a schematic structural diagram of a brake structure in an embodiment of the present application;

[0024] Figure 8 It is a structural schematic diagram of the contact line polishing and maintenance trolley in the embodiment of the present application pulling out the debris collection frame;

[0025] Fig. 9 It is a schematic diagram of assembling the contact wire maintenance trolley of the present application on a manifold;

[0026] Fig.10 yes Fig. 9 Left view of the assembly drawing in .

[0027] The markings in the attached drawings are: 1-frame, 101-side plate, 102-mounting plate, 103-support rod, 104-protective shell, 105-ventilation shutter; 2-travel mechanism, 201-travel wheel, 2011-annular flange, 2012-end, 2013-braking surface, 202-buckle sleeve, 2021-fixing plate, 2022-shaft sleeve, 203-B spring, 204-locking rod, 205-card column, 206-card slot; 3-grinding mechanism, 301-grinding Grinding wheel, 302-motor, 303-self-tightening chuck; 4-power control module; 5-brake structure, 501-brake pad, 502-brake rod, 503-balance rod, 504-A spring; 6-pressure compensation structure, 601-torsion spring, 602-adjustment plate, 603-torsion spring shaft, 604-A pin, 605-B pin, 606-C pin; 7-camera; 8-display screen; 9-debris collection box, 901-lock; 10-bus; 11-contact line. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments; the contents not described in detail in the following embodiments are all common technical knowledge in the art.

[0029] Example ( Figure 1-Figure 8 ):

[0030] See also Figure 1 and Figure 2 The contact line polishing and maintenance trolley of this embodiment includes a frame 1, a walking mechanism 2, a grinding mechanism 3 and a power control module 4.

[0031] The walking mechanism 2 includes walking wheels 201 arranged on both sides of the upper end of the frame 1 (in this embodiment, two walking wheels 201 are arranged at intervals on each side); an annular flange 2011 is provided on the outer peripheral surface of the walking wheel 201; when working, the end 2012 of the walking wheel 201 is located in the slide groove on the side of the bus 10, and the annular flange 2011 cooperates with the edge of the bus 10 to form a limit.

[0032] The grinding mechanism 3 includes three grinding wheels 301 arranged at intervals; the grinding wheel 301 is arranged below the walking wheel 201 and is connected to the motor 302 (a DC motor is used in this embodiment) and is driven by the motor 302 to rotate and grind and polish the surface of the contact line 11.

[0033] The power control module 4 includes a controller and a battery for power supply; in actual use, a switch can be provided on the trolley to control the start or shut down of the motor 302; or a remote controller wirelessly connected to the controller can be provided to control the start or shut down of the motor 302 through the remote controller.

[0034] See also Figure 7 A brake structure 5 is provided above the travel wheel 201; the brake structure 5 includes a brake pad 501 and a brake rod 502; a groove is provided at the bottom of the brake pad 501 to match the brake surface 2013 of the travel wheel 201; a balance bar 503 is provided at each of the top two ends of the brake pad 501 to be slidably connected to the frame 1; an A spring 504 is provided on the outer sleeve of the balance bar 503, one end of the A spring 504 is connected to the head of the balance bar 503, and the other end is connected to the top of the frame 1; the brake rod 502 is provided between the two balance bars 503, and one end of the A spring 504 passes through the frame 1 and abuts against the top of the brake pad 501; the brake rod 502 is connected to the frame 1 by a thread. When in use, the brake pad 501 is rotated to adjust the fastening force of the travel wheel 201 to the brake pad 501 to change the sliding speed of the travel wheel 201 on the bus 10.

[0035] See also Figures 3 to 5, the grinding wheel 301 is connected to the pressure compensation structure 6; the pressure compensation structure 6 includes a torsion spring 601 and an inclined adjustment plate 602; the wheel axle of the grinding wheel 301 passes through the adjustment plate 602 and is connected to the output shaft of the motor 302; the torsion spring 601 is sleeved on the torsion spring shaft 603, and the two ends of the torsion spring 601 are at a certain angle (in this embodiment, the maximum angle between the two ends of the torsion spring 601 is 90 degrees), and are respectively fixed on the A pin 604 and the B pin 605; the two ends of the adjustment plate 602 are respectively The two ends of the motor mounting plate are connected through the C pin 606 and the A pin 604 (the motor mounting plate and the adjustment plate 602 are arranged correspondingly and tilted, and the adjustment plate 602 and the motor mounting plate are arranged on the inner and outer sides of the frame side plate 101 respectively); the C pin 606 is fixed on the frame 1, and the A pin 604 is slidably connected with the frame 1 (a strip hole for sliding the A pin 604 is provided on the frame 1); the torsion spring shaft 603 and the B pin 605 are fixed on the frame 1; the wheel axle of the grinding wheel 301 is rotatably connected with the adjustment plate 602. The degree of wear at different positions of the contact line 11 is different, which will make the contact force between the contact line 11 and the grinding wheel 301 inconsistent; at this time, the elastic force of the torsion spring 601 itself can be relied on to drive the A pin 604 to slide on the frame 1, so as to drive one end of the adjustment plate 602 to move relative to the frame 1, thereby adjusting the position of the grinding wheel 301 so that it can maintain a stable pressure on the contact line 11.

[0036] In this embodiment, a self-tightening chuck 303 is provided on the output shaft of the motor 302; the axle of the grinding wheel 301 is fixed in the self-tightening chuck 303. At this time, the contact position between the grinding wheel 301 and the contact line 11 can be adjusted by adjusting the depth of the axle of the grinding wheel 301 entering the self-tightening chuck 303, which is convenient to operate and also convenient for the later maintenance and replacement of the grinding wheel 301.

[0037] In this embodiment, a camera 7 is provided at each end of the frame 1, and correspondingly, two display screens 8 matching the camera 7 are provided on the frame 1; the two cameras 7 are used to monitor the line surface state of the contact line 11 before and after polishing, and display it through the corresponding display screens 8. During polishing, the staff can observe the polishing effect of the contact line 11 in real time through the display screen 8. If the polishing effect is not good, the motor 302 is turned off, the trolley is removed, and the contact position of the grinding wheel 301 with the contact line 11 is adjusted (that is, the grinding surface of the grinding wheel 301 is changed; the grinding surface of the grinding wheel 301 will be worn after long-term friction with the contact line 11, thereby affecting the polishing effect).

[0038] See also Figure 6In this embodiment, the frame 1 is provided with a buckle sleeve 202 corresponding to the travel wheel 201; a locking rod 204 is slidably provided in the buckle sleeve 202, and the end of the locking rod 204 passes through the frame 1 and is inserted into the travel wheel 201; the travel wheel 201 is rotatably connected with the locking rod 204; a clamping column 205 is provided on the locking rod 204, and correspondingly, a clamping groove 206 matching the clamping column 205 is provided on the buckle sleeve 202; a B spring 203 is provided on the outer sleeve of the locking rod 204; one end of the B spring 203 is connected to the head of the locking rod 204, and the other end is connected to the outer end surface of the buckle sleeve 202. At this time, the travel wheel 201 can be clamped on the edge of the slide slot of the bus 10, or detached from the slide slot of the bus 10 by rotating the locking rod 204, and the disassembly and assembly are more flexible. Among them, the card slot 206 includes an unlocking slot (i.e., a long slot in the figure) and a fastening slot (i.e., a short slot in the figure); when the card column 205 is located in the unlocking slot, the polishing and maintenance trolley of the present application can be installed on the bus 10, or removed from the bus 10; after the trolley is assembled on the bus 10, the locking rod 204 is rotated so that the card column 205 is located in the fastening slot, so that the walking mechanism 2 can clamp both sides of the bus 10, so that the trolley is fixed on the bus 10. First, the locking rod 204 is pressed inward, and then the locking rod 204 is rotated, so that the card column 205 can be switched between the fastening slot and the unlocking slot. In this embodiment, the buckle sleeve 202 includes an integrally formed fixing plate 2021 and a shaft sleeve 2022; the fixing plate 2021 is fixedly connected to the frame 1, and the card slot 206 is arranged on the shaft sleeve 2022.

[0039] In this embodiment, the bottom of the frame 1 is connected to a debris collection frame 9 in a drawer-like manner. During the polishing process of the contact line 11, a large amount of contact line burrs and dust will be generated; the setting of the debris collection frame 9 allows the generated contact line burrs and dust to fall into the debris collection frame 9 and be collected, thereby avoiding the splashing of contact line burrs and dust to cause environmental pollution and damage the health of operators. The debris collection frame 9 is provided with a lock 901. During the polishing process, the debris collection frame 9 is locked at the bottom of the frame 1; after the polishing is completed, the debris collection frame 9 is unlocked and pulled out (see Figure 8 ), just pour out the burrs and dust on the contact wire.

[0040] In this embodiment, the frame 1 includes two side panels 101 arranged opposite to each other; the two ends of the two side panels 101 are connected by a mounting plate 102 respectively; at this time, the structure is simple and easy to describe. A group of support rods 103 are also provided between the two side panels 101 to improve the strength of the frame 1. Specifically, the number of the support rods 103 is four, and they are symmetrically arranged on both sides of the grinding wheel 301, that is, two support rods 103 are respectively provided at both ends of the side panel 101. The mounting plate 102 is U-shaped, and the camera 7 is arranged in the middle of the mounting plate 102. The frame 1 is made of aluminum alloy, and the surface is specially treated to ensure its stability and durability; the design of the frame 1 needs to take into account the size and shape of the rigid contact network bus 10 to ensure that the polishing and maintenance trolley can remain stable during operation. A handle is provided on the mounting plate 102, and when the trolley is not in use, the trolley can be lifted away by grasping the handle; the trolley switch is provided on the handle.

[0041] In this embodiment, the power control module 4 and the motor 302 are respectively arranged on the outside of the two side panels 101, so as to prevent the force difference between the two sides of the rack 1 from being too large. The power control module 4 and the motor 302 are respectively provided with a protective shell 104 on the outside to prevent the power control module 4 and the motor 302 from being contaminated by external dust. Furthermore, the protective shell 104 is provided with a ventilation shutter 105 to facilitate the heat dissipation of the power control module 4 and the motor 302.

[0042] The specific process of polishing the contact line using the contact line polishing and maintenance trolley of the present application is as follows:

[0043] S1, place the ends 2012 of the traveling wheels 201 on both sides of the frame 1 in the slide grooves on both sides of the bus 10, the annular flange 2011 contacts the edge of the bus 10, and then adjust the locking rod 204 to make the clamping column 205 clamped in the fastening groove, and the contact line polishing and maintenance trolley of the present application is installed; at this time, the surface of the polishing wheel 301 will contact the contact line 11;

[0044] S2, rotating the brake lever 502, adjusting the fastening force of the brake pad 501 on the running wheel 201, so as to adjust the sliding speed of the polishing and maintenance trolley so that it can slide smoothly on the bus 10;

[0045] S3, the control motor 302 starts to drive the grinding wheel 301 to rotate; the grinding wheel 301 rubs against the surface of the contact wire 11, driving the polishing and maintenance trolley to automatically move forward on the bus 10 to grind and polish the contact wire 11;

[0046] During the polishing process, the two cameras 7 respectively capture the line surface status of the contact line 11 before and after polishing, and display it on the display screen 8; when the staff observes that the polishing effect of the contact line 11 is not good, the control motor 302 is turned off, the trolley is removed, and the contact position of the grinding wheel 301 with the contact line 11 is adjusted; then the trolley is reinstalled to perform subsequent polishing operations.

[0047] The above general description of the invention involved in this application and the description of its specific implementation methods should not be understood as limiting the technical solutions of the invention. Based on the disclosure of this application, those skilled in the art can, without violating the constituent elements of the invention involved, add, reduce or combine the disclosed technical features in the above general description or / and specific implementation methods (including examples) to form other technical solutions within the scope of protection of this application.

Claims

1. The contact line polishing and maintenance trolley is characterized by: It comprises a frame (1), a walking mechanism (2), a grinding mechanism (3) and a power control module (4); The walking mechanism (2) comprises walking wheels (201) arranged on both sides of the upper end of the frame (1); an annular flange (211) is provided on the outer circumference of the walking wheel (201); when working, the end (212) of the walking wheel (201) is located in a slide groove on the side of the bus (10), and the annular flange (211) cooperates with the edge of the bus (10) to form a limit position; The grinding mechanism (3) comprises at least one grinding wheel (301); the grinding wheel (301) is in driving connection with a motor (302) and is driven to rotate by the motor (302) to grind and polish the surface of the contact line (11); A brake structure (5) is provided above the travel wheel (201); the brake structure (5) comprises a brake pad (501) and a brake rod (502); a groove matching the brake surface (2013) of the travel wheel (201) is provided at the bottom of the brake pad (501); a balance rod (503) slidably connected to the frame (1) is provided at both ends of the top of the brake pad (501); an A spring (504) is provided on the outer sleeve of the balance rod (503); one end of the A spring (504) is connected to the head of the balance rod (503), and the other end is connected to the top of the frame (1); the brake rod (502) is provided between the two balance rods (503), and one end thereof passes through the frame (1) and abuts against the top of the brake pad (501); the brake rod (502) is connected to the frame (1) by threads; The grinding wheel (301) is connected to a pressure compensation structure (6); the pressure compensation structure (6) is used to enable the grinding wheel (301) to maintain a stable pressure on the contact line (11) during the grinding and polishing process.

2. The contact line polishing and maintenance trolley according to claim 1 is characterized in that: The pressure compensation structure (6) comprises a torsion spring (601) and an inclined adjustment plate (602); the wheel axle of the grinding wheel (301) passes through the adjustment plate (602) and is connected to the output shaft of the motor (302); the torsion spring (601) is sleeved on the torsion spring shaft (603), and the two ends of the torsion spring (601) are at a certain angle and are respectively fixed to the A pin (604) and the B pin (605); the two ends of the adjustment plate (602) are respectively connected to the two ends of the motor mounting plate through the A pin (604) and the C pin (606); the C pin (606) is fixed to the frame (1), and the A pin (604) is slidably connected to the frame (1); the torsion spring shaft (603) and the B pin (605) are fixed to the frame (1); and the wheel axle of the grinding wheel (301) is rotatably connected to the adjustment plate (602).

3. The contact line polishing and maintenance vehicle according to claim 1 is characterized in that: A self-tightening chuck (303) is provided on the output shaft of the motor (302); and the axle of the grinding wheel (301) is fixed in the self-tightening chuck (303).

4. The contact line polishing and maintenance vehicle according to claim 3 is characterized in that: A camera (7) is provided at each end of the frame (1), and correspondingly, two display screens (8) matching the cameras (7) are provided on the frame (1); the two cameras (7) are used to monitor the surface state of the contact line (11) before and after polishing, respectively, and display the state through the corresponding display screens (8).

5. The contact line polishing and maintenance trolley according to claim 1 is characterized in that: The frame (1) is provided with a buckle sleeve (202) corresponding to the travel wheel (201); a locking rod (204) is slidably provided in the buckle sleeve (202); the end of the locking rod (204) passes through the frame (1) and is inserted into the travel wheel (201); the travel wheel (201) is rotatably connected to the locking rod (204); a clamping column (205) is provided on the locking rod (204); correspondingly, a clamping groove (206) matching the clamping column (205) is provided on the buckle sleeve (202); a B spring (203) is provided on the outer sleeve of the locking rod (204); one end of the B spring (203) is connected to the head of the locking rod (204), and the other end is connected to the outer end surface of the buckle sleeve (202).

6. The contact line polishing and maintenance vehicle according to claim 1, characterized in that: The bottom of the frame (1) is connected to a debris collection frame (9) in a drawer-like manner.

7. The contact line polishing and maintenance vehicle according to claim 6, characterized in that: The frame (1) comprises two side panels (101) arranged opposite to each other; two ends of the two side panels (101) are connected via mounting plates (102) respectively, and a group of support rods (103) are arranged between the two side panels (101).

8. The contact line polishing and maintenance vehicle according to claim 7, characterized in that: The power control module (4) and the motor (302) are respectively arranged on the outside of the two side panels (101), and protective shells (104) are respectively arranged outside the power control module (4) and the motor (302).

9. The contact line polishing and maintenance vehicle according to claim 8, characterized in that: The protective shell (104) is provided with a ventilation shutter (105).

10. The contact line polishing and maintenance vehicle according to claim 1, characterized in that: Two walking wheels (201) are respectively arranged on both sides of the upper end of the frame (1); and three grinding wheels (301) are arranged on the frame (1).

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