Grounding device for railway vehicle

Abstract

The utility model relates to a grounding device for a railway vehicle, which comprises an end cover, a carbon brush assembly, an elastic piece, a brush carrier, an insulating plate and a friction disc, the carbon brush assembly and the elastic piece are installed on the brush carrier, the end cover and the insulating plate are installed on the upper side and the lower side of the brush carrier in a sealing mode, and the insulating plate is fixedly connected with an axle box front cover in a sealing mode. Mounting holes are correspondingly formed in the insulating plate and the brush carrier, and mounting bolts are inserted upwards from the lower surface of the insulating plate to realize fixed connection with the brush carrier. According to the grounding device, the structure of the external insulating plate is adopted, the requirement of an inter-city axle end mounting interface is conveniently met, and meanwhile, the insulating plate is fixedly connected with the brush carrier from bottom to top, so that the grounding device is simpler in structure and is also simple and convenient to disassemble and assemble.

Description

TECHNICAL FIELD

[0001] The utility model belongs to rail vehicle grounding device technical field, especially relates to a grounding device for rail vehicle. BACKGROUND

[0002] The grounding device is a low-resistance cross-connection device, which is used for conducting current on a stationary vehicle component to a rotating vehicle component, and is responsible for establishing a safe electrical connection in a determined circuit under any operation condition of the vehicle. The main functions of the grounding device include conducting working current, conducting signal current, vehicle grounding and / or protective grounding, etc.

[0003] The grounding device installed on the rail vehicle such as the subway mainly consists of an aluminum shell, a carbon brush fixing frame, a friction ring, a cable, a carbon brush and a constant force spring. The carbon brush and the spring-fixed carbon brush fixing frame are integrally fastened on the aluminum shell, and the carbon brush fixing frame and the aluminum shell are sealed and fastened. The carbon brush fixed on the carbon brush fixing frame is in normal work in contact with the friction disc, and the aluminum shell and the carbon brush are insulated by the internally installed insulating ring and insulating sleeve. The grounding device cannot meet the requirements of the installation interface of the axle end of the intercity vehicle, and the disassembly and assembly are relatively complex. Moreover, the structure of the aluminum shell makes the total weight of the grounding device heavier, which cannot meet the higher requirement of light weight of the intercity vehicle. UTILITY MODEL CONTENTS

[0004] The utility model mainly solves the technical problem that a grounding device for rail vehicle can meet the requirements of the installation interface of the intercity vehicle and is convenient to disassemble and assemble.

[0005] To solve the above technical problems, the basic idea of the technical scheme of the utility model is as follows:

[0006] A grounding device for rail vehicle, comprising an end cover, a carbon brush assembly, an elastic member, a brush holder, an insulating plate and a friction disc, the carbon brush assembly and the elastic member are installed on the brush holder, the end cover and the insulating plate are sealingly installed on the upper and lower sides of the brush holder, the insulating plate is sealingly and fixedly connected with the axle box front cover, and mounting holes are correspondingly arranged on the insulating plate and the brush holder. A mounting bolt is inserted from the lower surface of the insulating plate upwards to realize the fixed connection with the brush holder.

[0007] Further, the end cover is an aluminum cover, and the end cover is integrally casted and formed by aluminum material.

[0008] Further, the shape of the end cover is a bowl-shaped inverted buckle, the lower edge of the end cover has an outwardly horizontally extending annular mounting edge, a plurality of mounting seats are arranged on the mounting edge, the mounting seats are fixedly connected with the brush holder through screws, and a sealing gasket is arranged between the end cover and the brush holder.

[0009] Further, the brush holder comprises a middle mounting platform and a ring-shaped surrounding edge, the mounting platform is disc-shaped, the surrounding edge is formed by the upper projection of the outer edge of the mounting platform, a cable mounting seat is arranged on one side of the surrounding edge, a mounting groove is arranged on the mounting platform, the carbon brush assembly and the elastic member are mounted in the mounting groove, and the brush braid terminal of the carbon brush assembly is fixed on the mounting platform by screws.

[0010] Further, radial limiting structures are arranged between the surrounding edge and the end cover, the radial limiting structures comprise ring-shaped limiting bosses arranged in the inner circle of the surrounding edge and protruding upward, the longitudinal section of the ring-shaped limiting boss is square, the inner side surface of the lower edge of the end cover is clamped on the outer side of the ring-shaped limiting boss after installation, and the inner side surface of the lower edge of the end cover and the limiting boss are radially matched.

[0011] Further, the insulating plate is a square flat plate structure, a through hole is arranged in the center of the insulating plate for passing through the carbon brush assembly and the elastic member, fixing holes for fixing connection with the front cover of the axle box are arranged at four corners of the insulating plate, and mounting holes for fixing connection with the brush holder are uniformly arranged along the circumference of the through hole.

[0012] Further, flat washers and rotation-stopping washers are arranged between the screw head of the mounting bolt and the lower surface of the insulating plate, through holes are arranged on the flat washers and the rotation-stopping washers corresponding to the mounting holes, and the mounting bolt passes through the rotation-stopping washer, the flat washer, the insulating plate and the brush holder from bottom to top in sequence.

[0013] Further, the flat washer is an aluminum washer with a thickness of 3mm, and the rotation-stopping washer is a stainless steel washer with a thickness of 0.5mm.

[0014] Further, rotation-stopping flaps are arranged on the rotation-stopping washer corresponding to each through hole and protrude towards the center of the circle in the inner circle, and the rotation-stopping flaps are bent towards the screw head of the mounting bolt after installation, so that the rotation-stopping flaps are attached to the side surface of the screw head to realize rotation stopping.

[0015] Further, ring-shaped bosses are arranged on the edge of the central through hole of the insulating plate and protrude downward, and the flat washer and the rotation-stopping washer are mounted on the outer side of the ring-shaped bosses.

[0016] Further, sealing glue is coated between the insulating plate and the brush holder and between the insulating plate and the front cover of the axle box.

[0017] Compared with the prior art, the grounding device for a railway vehicle has the following advantages:

[0018] (1) The utility model discloses an external insulation board structure, which is installed below the brush holder, and the lower surface of the insulation board is connected with the front cover of the shaft end, and the sealing glue is used for sealing and fastening, so that the requirements of the shaft end installation interface of the intercity vehicle can be met.

[0019] (2) The utility model discloses an external insulation board structure, which is installed below the brush holder, and the lower surface of the insulation board is connected with the front cover of the shaft end, and the sealing glue is used for sealing and fastening, so that the requirements of the shaft end installation interface of the intercity vehicle can be met.

[0020] (3) The utility model discloses an external insulation board structure, which is installed below the brush holder, and the lower surface of the insulation board is connected with the front cover of the shaft end, and the sealing glue is used for sealing and fastening, so that the requirements of the shaft end installation interface of the intercity vehicle can be met.

[0021] The specific embodiments of the utility model will be described in detail below with reference to the drawings. DRAWINGS

[0022] The drawings are part of the utility model and are used to provide further understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof are used to explain the utility model, but do not constitute improper limitation on the utility model. Obviously, the drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] In the drawings:

[0024] Figure 1 is the structure explosion drawing of the utility model grounding device;

[0025] Figure 2 is the structure top view of the utility model grounding device;

[0026] Figure 3 is Figure 2 A-A section view of

[0027] In the drawings:

[0028] End cover 1, mounting edge 11, mounting seat 12, first screw hole 13, carbon brush assembly 2, carbon brush 21, brush braid 22, elastic member 3, brush holder 4, second screw hole 41, surrounding edge 42, mounting platform 43, cable mounting seat 44, brush groove 45, fixing groove 46, third screw hole 47, insulating plate 5, through hole 51, fixing hole 52, first mounting hole 53, annular boss 54, friction disc 6, mounting lug 61, mounting hole 62, mounting bolt 7, bolt 8, flat washer 9, through hole 91, anti-rotation washer 10, through hole 101, anti-rotation stopper 102.

[0029] It should be noted that the drawings and the written description are not intended to limit the scope of the present application in any way, but are merely to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0031] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0032] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] As Figures 1 to 3The utility model provides a kind of grounding device for rail vehicle, mainly for the axle end grounding device of intercity car. Including end cover 1, carbon brush assembly 2, elastic member 3, brush holder 4, insulating plate 5 and friction disc 6, carbon brush assembly 2 and elastic member 3 are installed on brush holder 4, end cover 1 is fixed above brush holder 4 by multiple screws (not shown in drawing), insulating plate 5 is fixed below brush holder 4 by multiple groups of mounting bolt 7, i.e. end cover 1 and insulating plate 5 are respectively sealed and installed on the upper and lower sides of brush holder 4, the lower surface of insulating plate 5 is further sealed and fixedly connected with axle box front cover (not shown in drawing), friction disc 6 is fixed in the end of axle (not shown in drawing) by bolt. Current is accessed into grounding device by cable fixed in brush holder 4, and is conducted to axle and wheel by brush holder 4, carbon brush assembly 2 and friction disc 6, forms current loop.

[0034] In the embodiment, mounting holes are provided on the insulating plate 5 and the brush holder 4, and the mounting bolt 7 for fixedly connecting the insulating plate 5 and the brush holder 4 is inserted from the lower surface of the insulating plate 5 to the brush holder 4, i.e. from the direction away from the brush holder 4 to the direction towards the brush holder 4.

[0035] The grounding device adopts the structure of external insulating plate 5, and is fixedly connected with the brush holder 4 and the axle end front cover, which can meet the requirements of the axle end mounting interface of intercity car. Moreover, the insulating plate 5 is fixedly connected with the brush holder 4 from bottom to top, which can make the structure of the grounding device more simple, and the end cover 1 and the insulating plate 5 are respectively installed from the upper and lower sides of the brush holder 2, which are not affected by each other, and can be independently disassembled and assembled.

[0036] In the embodiment, the end cover 1 is made of aluminum cover and is integrally formed by aluminum material, which can ensure the structural strength of the end cover 1 and reduce the total weight of the grounding device, so as to meet the higher requirements of intercity vehicle for light weight.

[0037] In the embodiment, the end cover 1 is further preferably in the form of bowl-shaped structure with inverted bottom, which can form a larger mounting space above the brush holder 4, facilitate the installation of the carbon brush assembly 2 and the elastic member 3, reduce the occupied space of the end cover 1, and further reduce the weight of the end cover 1.

[0038] In the embodiment, it is further preferred that the lower edge of the end cover 1 has an outwardly horizontally extending annular mounting edge 11, the lower surface of the mounting edge 11 is a mounting surface fixedly mounted with the brush holder 4, and at least two mounting seats 12 are arranged above the mounting edge 11. In the embodiment, three mounting seats 12 are preferably arranged, the mounting seats 12 are formed by upwardly protruding from the mounting edge 11, a first screw hole 13 is formed on each mounting seat 12, three second screw holes 41 are correspondingly arranged on the brush holder 4, the first screw hole 13 is a smooth through hole, and the second screw hole 41 is an internally threaded hole. Three screws are sequentially inserted into the first screw hole 13 and the second screw hole 41 from top to bottom, and then the end cover 1 and the brush holder 4 are fixedly connected together.

[0039] In the embodiment, it is further preferred that a sealing gasket is arranged between the end cover 1 and the brush holder 4, the sealing gasket is used to form a sealing space between the end cover 1 and the brush holder 4 for mounting the carbon brush assembly 2 and the elastic member 3, and the carbon brush assembly 2 is ensured to work in an ideal space.

[0040] In the embodiment, the brush holder 4 is integrally cast in copper material with good electrical conductivity, and includes an annular surrounding edge 42 and a middle mounting platform 43. The mounting platform 43 is disc-shaped, and the surrounding edge 42 is formed by upwardly protruding from the outer edge of the mounting platform 43. An integrally cast cable mounting seat 44 horizontally extends outwardly from one side of the annular surrounding edge 42.

[0041] A plurality of integrally downwardly extending mounting grooves (not shown in the figure) are arranged on the mounting platform 43. Each group of the mounting grooves includes a brush groove 45 and a fixing groove 46 arranged correspondingly. The fixing groove 46 is arranged on one side of the brush groove 45 and is in communication through an opening on the side. The number of the carbon brush assemblies 2 can be set according to the needs of the vehicle grounding. For example, only one group of carbon brush assemblies 2 can be arranged, or two groups, three groups, four groups or even more groups of carbon brush assemblies 2 can be arranged. In the embodiment, three groups of carbon brush assemblies 2 and elastic members 3 are preferably arranged on the mounting platform 43 of the brush holder 4, and the three groups of carbon brush assemblies 2 and elastic members 3 are uniformly distributed at an angle of 120° in the circumferential direction. Each group of carbon brush assemblies 2 includes a carbon brush 21 and a brush braid 22, and the elastic member 3 is a constant force spring. Correspondingly, three groups of brush grooves 45 and fixing grooves 46 are arranged on the mounting platform 43. The carbon brush 21 is slidably arranged in the corresponding brush groove 45, and the elastic member 3 is arranged in the corresponding fixing groove 46. The elastic member 3 provides a constant pressure to the carbon brush 21, so as to stably fix the carbon brush 21 in the brush holder 4, to ensure that the friction surface at the bottom of the carbon brush 21 continuously contacts the friction disc 6 arranged on the axle, and to ensure that the current reliably passes through. The terminal at the end of the brush braid 22 is fixed on the mounting platform 43 by a screw, and a third screw hole 47 is correspondingly arranged on the mounting platform 43.

[0042] In this embodiment, three second screw holes 41 for fixed connection with the end cover 1 are arranged on the upper surface of the surrounding edge 42, and the upper surface of the surrounding edge 42 is the mounting surface for fixed connection with the end cover 1. The upper surface of the cable mounting seat 44 is the cable mounting surface, and two fixing holes (not shown in the figure) are arranged thereon. The cable mounting surface is higher than the mounting surface of the brush holder 4 fixedly connected with the end cover 1, and the cable is fixed to the two fixing holes of the cable mounting seat 44 by a pipe clamp. A mounting hole (not shown in the figure) for fixed connection with the insulating plate 5 is further arranged on the lower surface of the brush holder 4, and the mounting hole is an internally threaded hole.

[0043] In this embodiment, it is further preferred that a radial limiting structure is arranged between the surrounding edge 42 and the end cover 1. The radial limiting structure includes an annular limiting boss 48 arranged in the inner circle of the surrounding edge 42 and protruding upward. The limiting boss 48 is integrally formed with the brush holder 4, the longitudinal section of the limiting boss 48 is square, the inner side surface of the lower edge of the end cover 1 is clamped on the outer side of the limiting boss 48 after installation, and the inner side surface of the lower edge of the end cover 1 is radially matched with the limiting boss 48. After the end cover 1 is fixedly connected with the brush holder 4, the outer side surface of the limiting boss 48 and the inner side surface of the lower edge of the end cover 1 form a radial matching surface in the inner circle of the end cover 1. The radial limiting is realized, and at the same time, a sealing surface is formed between the limiting boss 48 and the end cover 1 by the radial matching surface, which further improves the waterproof sealing performance of the grounding device and ensures that the carbon brush assembly 2 works in an ideal space.

[0044] In this embodiment, the insulating plate 5 is an integrally formed flat plate with a square overall shape, and a through hole 51 for passing through the carbon brush assembly 2 and the elastic member 3 is arranged in the center. Four fixing holes 52 for fixed connection with the front cover of the shaft box are arranged at four corners of the insulating plate 5, and the four fixing holes 52 are fixedly connected together with the front cover of the shaft box by four bolts 8.

[0045] In this embodiment, the corresponding mounting holes arranged on the insulating plate 5 and the brush holder 4 include a first mounting hole 53 arranged on the insulating plate 5 and a second mounting hole (not shown in the figure) arranged on the brush holder 4. The second mounting hole is arranged on the lower surface of the surrounding edge 42 of the brush holder 4, and the first mounting hole 53 for fixed connection with the brush holder 4 is uniformly arranged along the circumference of the through hole 51 of the insulating plate 5. It is further preferred that the first mounting hole 53 and the second mounting hole are uniformly arranged in six groups. The six first mounting holes 53 are smooth through holes, and the second mounting holes are internally threaded holes. Six mounting bolts 7 are inserted into the six first mounting holes 53 and the second mounting holes from bottom to top, so as to realize the fixed connection between the insulating plate 5 and the brush holder 4.

[0046] In this embodiment, a layer of sealant is coated between the lower surface of the insulating plate 5 and the mounting surface of the front cover of the axle box, for realizing the sealed connection between the insulating plate 5 and the front cover of the axle box. Similarly, a layer of sealant is also coated between the upper surface of the insulating plate 5 and the brush holder 4, for realizing the sealed connection between the insulating plate 5 and the brush holder 4. Since the sealant is used to realize the sealing between the insulating plate 5 and the front cover of the axle box and the brush holder 4, the structure of the external insulating plate 5 is more conducive to matching the mounting interface of the front cover of the axle box, meeting the installation requirements of the intercity vehicle, and also ensuring that the carbon brush assembly 2 works in an ideal sealed space, effectively preventing the carbon powder generated by the carbon brush assembly 2 from leaking out, and also ensuring the sealing and waterproof performance.

[0047] In this embodiment, a circular ring-shaped flat gasket 9 is mounted between the lower surface of the insulating plate 5 and the head of the mounting bolt 7, six through holes 91 are uniformly arranged on the flat gasket 9, and the six mounting bolts 7 pass through the six through holes 91 on the flat gasket 9 to be fixedly connected with the insulating plate 5 and the brush holder 4. The flat gasket 9 is preferably an aluminum gasket with a thickness of 3 mm, which can ensure that the fixed connection of the mounting bolt 7 is more firm, and is also conducive to reducing the total weight of the grounding device.

[0048] In this embodiment, a circular ring-shaped rotation-stopping gasket 10 is also mounted between the lower surface of the insulating plate 5 and the head of the mounting bolt 7, the rotation-stopping gasket 10 is mounted below the flat gasket 9, six through holes 101 are also uniformly arranged on the rotation-stopping gasket 10, and the six mounting bolts 7 pass through the through holes 101 on the rotation-stopping gasket 10 and then pass through the through holes 91 on the flat gasket 9 to be fixedly connected with the insulating plate 5 and the brush holder 4.

[0049] In this embodiment, it is further preferred that a rotation-stopping baffle 102 protrudes from the inner circle of the rotation-stopping gasket 10 towards the center of the circle corresponding to each through hole 101, the rotation-stopping baffle 102 has a semicircular structure, and the mounting bolt 7 is bent towards the head of the mounting bolt 7 after installation, so that the rotation-stopping baffle 102 is attached to the side surface of the bolt head to realize the rotation-stopping effect. In this way, through a simple structure, the mounting bolt 7 will not rotate to cause loosening or falling off during the operation of the vehicle, ensuring the safety of operation. The rotation-stopping gasket 10 is preferably made of stainless steel with a thickness of 0.5 mm, which can ensure its strength and facilitate bending and the disassembly and assembly of the mounting bolt 7.

[0050] In this embodiment, a ring-shaped boss 54 protrudes downward from the edge of the through hole 51 in the center of the insulating plate 5, the carbon brush assembly 2 and the elastic member 3 pass through the center of the ring-shaped boss 54 to contact the surface of the friction disc 6, and the flat gasket 9 and the rotation-stopping gasket 10 are installed on the outside of the ring-shaped boss 54.

[0051] During installation, the flat washer 9 and the rotation-stopping washer 10 are first sleeved outside the annular boss 54 of the insulating plate 5, the rotation-stopping washer 10 is installed below the flat washer 9, and then the six mounting bolts 7 are sequentially inserted from bottom to top through the rotation-stopping washer 10, the flat washer 9, the insulating plate 5 and the brush holder 4, thereby fixing the insulating plate 5 on the brush holder 4.

[0052] In the embodiment, the mounting lug 61 is outwardly extended along the circumference of the friction disc 6, the mounting hole 62 is formed on the mounting lug 61, and the friction disc 6 is fixedly connected with the shaft end (not shown in the figure) of the axle through three bolts (not shown in the figure).

[0053] The grounding device for a rail vehicle has the following advantages.

[0054] 1. The grounding device adopts the structure of an external insulating plate, the insulating plate is integrally installed below the brush holder, the lower surface of the insulating plate is connected with the front cover of the axle end, and the sealing glue is used for sealing and fastening, so that the requirements of the axle end installation interface of the intercity vehicle can be met.

[0055] 2. The grounding device is fixedly connected with the brush holder from bottom to top, the structure of the grounding device is more simple, the end cover and the insulating plate are respectively installed from the upper and lower sides of the brush holder, are not affected by each other, can be independently disassembled, and are simple and convenient to disassemble.

[0056] 3. The end cover of the grounding device adopts an aluminum cover structure, and the sealing gasket is used for sealing and fastening between the end cover and the brush holder, the carbon brush and the friction disc are protected from normal contact and work, the structure can ensure the structural strength of the end cover, ensure the protection of other internal components, is conducive to reducing the weight of the grounding device, and meets the higher requirements of the intercity vehicle on light weight.

[0057] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form, although the utility model has been disclosed as above, however, the utility model is not limited, any person skilled in the art can make some changes or modifications to the above-mentioned technical content without departing from the technical scheme of the utility model, and equivalent embodiments of equivalent changes are equivalent, the implementation solutions in the above embodiment can be further combined or replaced, as long as the content of the utility model is not deviated, any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the utility model are still within the scope of the utility model.

Claims

1. A grounding device for a rail vehicle, characterized in that: The carbon brush assembly and the elastic member are installed on the brush holder, the end cover and the insulating plate are sealingly installed on the upper and lower sides of the brush holder, the insulating plate is sealingly and fixedly connected with the front cover of the shaft box, and the installation holes are correspondingly arranged on the insulating plate and the brush holder.

2. The track vehicle grounding device of claim 1, wherein: The end cover is an aluminum cover which is integrally formed by aluminum material.

3. The track vehicle grounding device of claim 1, wherein: The end cover is in the shape of an inverted bowl, and the lower edge of the end cover has an outwardly horizontally extending annular mounting edge, a plurality of mounting seats are arranged on the mounting edge, the mounting seats are fixedly connected with the brush holder by screws, and a sealing gasket is arranged between the end cover and the brush holder.

4. The track vehicle grounding device of claim 1, wherein: The brush holder includes an intermediate mounting platform and an annular surrounding edge, the mounting platform is in the shape of a disc, the surrounding edge is formed by the upward protrusion of the outer edge of the mounting platform, a cable mounting seat is arranged on one side of the surrounding edge, an integral downward extending mounting groove is arranged on the mounting platform, the carbon brush assembly and the elastic member are installed in the mounting groove, and the brush braid terminals in the carbon brush assembly are fixed on the mounting platform by screws.

5. The track vehicle grounding device of claim 4, wherein: Radial limiting structures are arranged between the surrounding edge and the end cover, the radial limiting structures include annular limiting bosses which are arranged on the inner circle of the surrounding edge and protrude upward, the longitudinal section of the annular limiting boss is square, the inner side surface of the lower edge of the end cover is clamped on the outer side of the annular limiting boss after installation, and the inner side surface of the lower edge of the end cover is radially matched with the limiting boss.

6. The track vehicle grounding device of claim 1, wherein: The insulating plate is in the shape of a square flat plate, a through hole is arranged in the center of the insulating plate for passing the carbon brush assembly and the elastic member, fixing holes for fixedly connecting with the front cover of the shaft box are arranged at the four corners of the insulating plate, and the installation holes for fixedly connecting with the brush holder are uniformly arranged along the circumference of the through hole.

7. The track vehicle grounding device of claim 6, wherein: Flat washers and anti-rotation washers are arranged between the bolt head of the installation bolt and the lower surface of the insulating plate, through holes are arranged on the flat washers and the anti-rotation washers corresponding to the installation holes, and the installation bolt is sequentially passed through the anti-rotation washer, the flat washer, the insulating plate and the brush holder from bottom to top.

8. The track vehicle grounding device of claim 7, wherein: The flat washer is an aluminum washer with a thickness of 3mm, and the anti-rotation washer is a stainless steel washer with a thickness of 0.5mm.

9. The track vehicle grounding device of claim 7, wherein: An anti-rotation stopper is arranged on the anti-rotation washer corresponding to each through hole and protrudes towards the center of the circle, and the anti-rotation stopper is bent towards the bolt head after installation of the installation bolt, so that the anti-rotation stopper is attached to the side surface of the bolt head to achieve anti-rotation.

10. The track vehicle grounding device according to any one of claims 1-9, characterized in that: Sealing glue is coated between the insulating plate and the brush holder and between the insulating plate and the front cover of the shaft box.

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