Regional maintenance transport vehicle device for railway high-voltage line

By designing the railway high-voltage line area maintenance transport vehicle device, using frames, walking mechanisms, rail clamps, slide mechanisms, slewing mechanisms and lifting mechanisms, the high-voltage electrical dependence problem of small and medium-sized spare parts repair and transportation is solved, and efficient and safe maintenance and transportation is achieved.

CN120482959APending Publication Date: 2025-08-15GUOTOU (TANGSHAN) COAL STORAGE & TRANSPORTATION CO LTD
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Patent Information

Application Number
CN202510839972.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-23
Publication Date
2025-08-15

AI Technical Summary

Technical Problem

In the prior art, the maintenance and transportation of small and medium-sized spare parts in the railway high-voltage line area requires professionals to stop sending high-voltage electricity, which is cumbersome in operation, affects work efficiency and is cost-effective.

Method used

A transport vehicle device for railway high-voltage line area maintenance is designed, including a frame, a walking mechanism, a rail clamp, a slide mechanism, a slewing mechanism, a boom and a lifting mechanism, which can realize the lifting, translation and transportation of small and medium-sized spare parts without stopping high voltage power.

Benefits of technology

It realizes that while continuously sending high-voltage electricity, reduces the cost of personnel and machinery rental, improves work efficiency, ensures safety and flexibility, and has many applicable scenarios and is easy to promote.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a railway high-voltage line area maintenance transport vehicle device, and relates to the technical field of mechanical equipment maintenance, the railway high-voltage line area maintenance transport vehicle device comprises a vehicle frame, a walking mechanism is fixedly arranged below the vehicle frame, a sliding rail mechanism is welded to the bottom of the vehicle frame, and a driving device is fixedly arranged through a bolt; according to the railway high-voltage line area maintenance transport vehicle device, through the rail clamping devices, the sliding rail mechanism, the rotating mechanism, the suspension arm and the hoisting mechanism, work such as low-position hoisting, horizontal moving and matched maintenance of small and medium-sized spare parts can be achieved, the maintenance efficiency is improved, and the maintenance cost is reduced. Compared with the prior art, professionals do not need to stop supplying high-voltage electricity, a crane does not need to be rented, the personnel and mobile machinery cost is reduced, hoisting and maintenance work of small and medium-sized spare parts is achieved under the condition that the high-voltage electricity is not supplied, the working efficiency is improved on the premise that safety is guaranteed, and the personnel demand and labor force are reduced.
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Description

Technical Field

[0001] The invention relates to the technical field of mechanical equipment maintenance, in particular to a maintenance transport vehicle device for railway high-voltage line areas. Background Art

[0002] Freight trains are generally powered by (27500V) high-voltage lines. For equipment maintenance in related areas such as below the high-voltage lines, factory buildings, and machine rooms, high requirements are required for lifting and transportation work. In current work, according to relevant railway requirements, the use of cranes or higher vehicles in the area requires qualified personnel to contact the railway. After the railway personnel agree, they apply for a key to disconnect the high voltage power, and then restore the high voltage power after the maintenance is completed. This operation requires professional electricians to obtain evidence and the tool requirements are high and the procedures are cumbersome. In particular, it has a great impact on the maintenance, transportation, and replacement of small and medium-sized spare parts. To address this problem, a maintenance and transportation vehicle device for railway high-voltage line areas is provided.

[0003] In order to solve the above technical problems, the present invention provides a maintenance and transportation vehicle device for railway high-voltage line areas, which can realize the maintenance and transportation of small and medium-sized spare parts without stopping the supply of high-voltage electricity, improve work efficiency while ensuring safety, and reduce personnel requirements and labor. Summary of the Invention

[0004] The object of the present invention is to provide a maintenance transport vehicle device for railway high-voltage line areas, so as to solve the problem in the prior art that it is difficult to store connecting wires when repairing portable mechanical equipment.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A maintenance and transport vehicle device for railway high-voltage line areas, comprising a frame, a walking mechanism fixedly arranged below the frame, a slide rail mechanism welded to the bottom of the frame, and a driving device fixed by bolts, connecting plates are provided at the four corners of the frame, rail clamps are fixed on the connecting plates by bolts, a slewing mechanism is connected to the top of the slide rail mechanism, a boom is fixedly arranged above the slewing mechanism, and a lifting mechanism is fixed on the front side of the boom.

[0006] Preferably, the frame is made of 10mm steel plates welded together, and reinforcing ribs are arranged inside the frame to ensure the stability and load-bearing of the overall steel structure. The lower part of the frame is reserved for the axis hole and the drive fixing bolt hole of the walking mechanism, and the upper half of the frame is used for the slide rail movement and rotation hole.

[0007] Preferably, the walking mechanism includes two walking wheels, a walking drive large gear, a walking drive small gear, a three-in-one reducer, a main shaft and two bearing seats. The two walking wheels are fixed on both sides of the main shaft by bolts, and the walking wheels are in the form of train wheels, and the inner protruding arc is parallel to the track, limiting the maintenance transport vehicle to move along the track. The walking drive large gear is fixedly sleeved on the middle of the main shaft through a key connection and a shaft shoulder, and the walking drive large gear is meshed with the walking drive small gear, and the walking drive small gear is fixedly connected to the output shaft of the three-in-one reducer, thereby driving the entire maintenance vehicle forward and backward. The three-in-one reducer is installed on the frame, and the two bearing seats are rotatably sleeved on the outside of the main shaft, and the bearing seats are fixed on the frame to ensure that the maintenance transport vehicle travels smoothly. The entire walking mechanism is located at the lowered center at the bottom of the frame and is arranged parallel to the main shaft, directly driven to ensure response speed.

[0008] Preferably, the rail clamp includes a rail clamp main structure, a rail clamp leg, a hydraulic cylinder, a connecting base, an oil tank, a spring and a connecting rod, the connecting base is fixed to the connecting plate of the frame, the rail clamp leg is fixed to the rail clamp main structure through an axle pin, the spring is fixed to the rail clamp main structure through a connecting rod, and the connecting rod and the hydraulic cylinder are arranged on the rail clamp leg through an axle pin.

[0009] Preferably, the slide mechanism includes a slide rod, a slide plate, an electric push rod, a pin and a support ear. The slide rod is fixed to the frame by welding, and the slide rod is symmetrically arranged on both sides to form a C-shaped groove. The slide plate is slidably set in the C-shaped groove of the slide rod, and a support ear is set on one side of the slide plate. The piston rod end of one end of the electric push rod is provided with a pin, and the electric push rod is connected to the support ear through the pin, and the other end of the electric push rod is set on the frame by a bolt. The upper rotation, translation of the boom, etc. are achieved through the translation of the piston rod of the electric push rod, and at the same time, the space above the frame is enlarged to achieve a larger load-bearing surface for transportation.

[0010] Preferably, the rotating mechanism includes a rotating inner ring gear, a rotating pinion, a three-in-one reducer 2, a rotating support shaft and a bearing rod. The rotating support shaft and the three-in-one reducer 2 are both fixed to the upper part of the skateboard. The rotating support shaft is rotatably connected to the rotating inner ring gear through the bearing rod. The output end of the three-in-one reducer 2 is fixedly provided with a rotating pinion, and the rotating pinion is meshed with the rotating inner ring gear. The rotating pinion is driven by the three-in-one reducer 2 to realize the rotation of the rotating inner ring gear and perform a rotating action.

[0011] Preferably, the boom includes a fixed arm, an electric push rod 2 and a movable arm. The fixed arm is fixed to the upper part of the rotating inner gear ring by a bolt connection. The electric push rod 2 is rotatably connected between the movable arm and the fixed arm through an axle pin. The rear end of the movable arm is rotatably connected to the top end of the fixed arm. The pitching movement of the movable arm is realized by the extension and retraction of the electric push rod 2.

[0012] Preferably, the lifting mechanism includes a hook, a winch and a wire rope. The winch is fixed to the front end of the movable arm by bolts. One end of the wire rope is fixedly wound on the output roller on the winch. The hook is fixed to the other end of the wire rope by a buckle. The output roller is driven to rotate by the winch 72, so that the output roller is used to reel in or release the wire rope 73, thereby realizing the lifting action of the spare parts.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention can realize the low-level lifting, translation, and coordinated maintenance of small and medium-sized spare parts through the rail clamp, slide mechanism, slewing mechanism, boom and lifting mechanism. Compared with the existing technology, there is no need for professional personnel to stop the high-voltage power supply, and there is no need to rent a crane, which reduces the cost of personnel and mobile machinery. It can realize the lifting and maintenance of small and medium-sized spare parts without stopping the high-voltage power supply, improve work efficiency while ensuring safety, and reduce personnel requirements and labor.

[0015] 2. The present invention can realize the transportation of small and medium-sized spare parts through the frame and the traveling mechanism. The process of transporting spare parts does not require multiple transportation by cranes, forklifts, overhead cranes, electric hoists, etc. as in the existing method. The spare parts can be hoisted and placed on the top of the frame for horizontal transportation in the first step, which is fast and efficient and reduces personnel requirements and labor.

[0016] 3. The slide rail mechanism realizes the upper rotation and translation of the boom through the translation of the push rod, and at the same time, the space above the frame is enlarged to achieve a larger load-bearing surface for transportation.

[0017] 4. The rail clamp legs are fixed to the upper and lower sides of the track, making the vehicle and the track become one, with better anti-overturning ability to ensure overall safety.

[0018] 5. The present invention has the outstanding advantages of low cost, easy processing and manufacturing, multiple applicable scenarios, easy use, and easy promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an overall three-dimensional schematic diagram of a maintenance and transport vehicle device for railway high-voltage line areas according to the present invention;

[0020] Figure 2 This is a partial three-dimensional schematic diagram of the traveling mechanism of a vehicle device for railway high-voltage line area maintenance and transportation according to the present invention;

[0021] Figure 3 This is a partial perspective schematic diagram of a rail clamp for a railway high-voltage line area maintenance and transportation vehicle device according to the present invention;

[0022] Figure 4 This is a partial three-dimensional schematic diagram of a slide rail mechanism for a railway high-voltage line area maintenance and transportation vehicle device according to the present invention;

[0023] Figure 5 This is a partial three-dimensional schematic diagram of a slewing mechanism of a railway high-voltage line area maintenance and transportation vehicle device according to the present invention;

[0024] Figure 6 This is a partial perspective schematic diagram of a boom of a vehicle device for railway high-voltage line area maintenance and transportation according to the present invention;

[0025] Figure 7 It is a partial three-dimensional schematic diagram of a lifting mechanism of a railway high-voltage line area maintenance and transportation vehicle device according to the present invention.

[0026] 1. The gantry crane is a kind of crane which is used to drive the gantry crane to move the gantry crane to the gantry crane, and the gantry crane has a plurality of driving mechanisms, such as the gantry crane, the gantry crane and the gantry crane. The gantry crane has a plurality of driving mechanisms, such as the gantry crane, the gantry crane and the gantry crane. The gantry crane has a plurality of driving mechanisms, such as the gantry crane, the gantry crane and the gantry crane. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] Example: Figure 1 - Figure 7As shown, the present invention provides a technical solution for a railway high-voltage line area maintenance and transportation vehicle device, including a frame 1, a traveling mechanism 2 is fixedly arranged below the frame 1, a slide rail mechanism 4 is welded to the bottom of the frame 1, and a driving device is fixed by bolts, connecting plates are provided at the four corners of the frame 1, and a rail clamp 3 is fixed on the connecting plate by bolts, a slewing mechanism 5 is connected to the top of the slide rail mechanism 4, a boom 6 is fixedly arranged above the slewing mechanism 5, and a lifting mechanism 7 is fixedly arranged on the front side of the boom 6.

[0029] like Figure 1 As shown, the frame 1 is made of 10mm steel plates welded together. Reinforcement ribs are arranged inside the frame 1 to ensure the stability and load-bearing of the overall steel structure. The lower part of the frame 1 is reserved for the shaft hole and drive fixing bolt hole of the walking mechanism 2, and the upper half of the frame 1 is used for the slide rail movement and rotation hole.

[0030] like Figure 1 and Figure 2 As shown, the walking mechanism 2 includes two walking wheels 21, a walking drive gear 22, a walking drive pinion 23, a three-in-one reducer 24, a main shaft 25 and two bearing seats 26. The two walking wheels 21 are fixed to both sides of the main shaft 25 by bolts, and the walking wheels 21 are in the form of train wheels, with the inner protruding arc parallel to the track, limiting the maintenance transport vehicle from moving along the track. The walking drive gear 22 is fixedly sleeved on the middle part of the main shaft 25 through a key connection and a shaft shoulder. The walking drive gear 22 is meshed and connected with the walking drive pinion 23. The walking drive pinion 23 is fixedly connected to the output shaft of the three-in-one reducer 24, thereby driving the entire maintenance vehicle forward and backward. The three-in-one reducer 24 is installed on the frame 1. The two bearing seats 26 are rotatably sleeved on the outside of the main shaft 25, and the bearing seats 26 are fixed on the frame 1 to ensure smooth travel of the maintenance transport vehicle. The entire walking mechanism 2 is located at the lowered center at the bottom of the frame 1 and is arranged parallel to the main shaft 25, directly driven to ensure response speed.

[0031] like Figure 1 and Figure 3 As shown, the rail clamp 3 includes a rail clamp main structure 31, a rail clamp leg 32, a hydraulic cylinder 33, a connecting base 34, an oil tank 35, a spring 36 and a connecting rod 37. The connecting base 34 is fixed to the connecting plate of the frame 1, the rail clamp leg 32 is fixed to the rail clamp main structure 31 through an axle pin, the spring 36 is fixed to the rail clamp main structure 31 through a connecting rod 37, and the connecting rod 37 and the hydraulic cylinder 33 are arranged on the rail clamp leg 32 through an axle pin.

[0032] Specifically, the rail clamp 3 uses a hydraulic cylinder 33 and a spring 36 to achieve clamping and loosening of the clamp legs, wherein the clamping is controlled by the elastic force of the spring 36, and the hydraulic cylinder 33 is used to open it, ensuring that the rail can be clamped in the event of a hydraulic system failure, thereby ensuring overall stability.

[0033] like Figure 1 and 4 As shown, the slide mechanism 4 includes a slide rod 41, a slide plate 42, an electric push rod 43, a pin 44 and a support ear 45. The slide rod 41 is fixed to the frame 1 by welding. The two sides of the slide rod 41 are symmetrically arranged in a C-shaped groove. The slide plate 42 is slidably set in the C-shaped groove of the slide rod 41, and a support ear 45 is set on one side of the slide plate 42. The piston rod end of one end of the electric push rod 43 is provided with a pin 44, and the electric push rod 43 is connected to the support ear 45 through the pin 44. The other end of the electric push rod 43 is set on the frame 1 by a bolt. The upper rotation and the translation of the boom 6, etc. are realized by the translation of the piston rod of the electric push rod 43. At the same time, the space above the frame 1 is enlarged to achieve a larger load-bearing surface for transportation.

[0034] like Figure 4 - Figure 6 As shown, the rotating mechanism 5 includes a rotating inner ring gear 51, a rotating pinion 52, a three-in-one reducer 2 53, a rotating support shaft 54 and a bearing rod 55. The rotating support shaft 54 and the three-in-one reducer 2 53 are both fixed to the upper part of the slide 42. The rotating support shaft 54 is rotatably connected to the rotating inner ring gear 51 through the bearing rod 55. The output end of the three-in-one reducer 2 53 is fixedly provided with a rotating pinion 52. The rotating pinion 52 is meshed with the rotating inner ring gear 51. The rotating pinion 52 is driven by the three-in-one reducer 2 53 to realize the rotation of the rotating inner ring gear 51 and perform a rotating action.

[0035] like Figure 6 As shown, the boom 6 includes a fixed arm 61, an electric push rod 2 62 and a movable arm 63. The fixed arm 61 is fixed to the upper part of the rotating inner gear ring 51 by bolts, the electric push rod 2 62 is rotatably connected between the movable arm 63 and the fixed arm 61 through an axle pin, and the rear end of the movable arm 63 is rotatably connected to the top end of the fixed arm 61. The pitching movement of the movable arm 63 is realized by the extension and retraction of the electric push rod 2 62.

[0036] like Figure 1 、 Figure 6 and Figure 7 As shown, the lifting mechanism 7 includes a hook 71, a hoist 72 and a wire rope 73. The hoist 72 is fixed to the front end of the movable arm 63 by bolts. One end of the wire rope 73 is fixedly wound around the output roller of the hoist 72. The hook 71 is fixed to the other end of the wire rope 73 by a buckle. The hoist 72 drives the output roller to rotate, thereby winding or releasing the wire rope 73 by the output roller, thereby realizing the lifting action of the spare part.

[0037] Working principle: First, operate to open the rail clamp 3, the sliding rail mechanism 4 is located in the middle of the frame 1, and the slewing mechanism 5 is in the direction of the track. Drive the maintenance transport vehicle through the level crossing and onto the track. Move to the maintenance location through the walking mechanism 2, clamp the rail clamp 3, adjust the sliding rail mechanism 4, slewing mechanism 5, boom 6 and lifting mechanism 7 according to actual conditions, so that the hook 71 is located above the maintenance point, and lift the spare parts that need to be replaced through the wire rope 73 or sling, adjust the sliding rail mechanism 4, slewing mechanism 5, boom 6 and lifting mechanism 7 again, place the spare parts that need to be replaced in the middle of the maintenance transport vehicle, adjust the sliding rail mechanism 4, slewing mechanism 5, boom 6 and lifting mechanism 7, release the rail clamp 3, operate the walking mechanism 2 to walk to an open area, clamp the rail clamp 3, adjust the sliding rail mechanism 4, slewing mechanism 5, boom 6 and lifting mechanism 7, so that the hook 71 lifts the spare parts, places them in an open space or transports them away by a vehicle; release the rail clamp 3, operate the walking mechanism Mechanism 2 moves to the new spare part storage location, clamps the rail clamp 3, adjusts the slide rail mechanism 4, slewing mechanism 5, boom 6 and lifting mechanism 7, and makes the hook 71 lift the spare part. Adjust the slide rail mechanism 4, slewing mechanism 5, boom 6 and lifting mechanism 7 again, place the new spare part in the middle of the maintenance transport vehicle, adjust the slide rail mechanism 4, slewing mechanism 5, boom 6 and lifting mechanism 7, release the rail clamp 3, operate the walking mechanism 2 to move to the maintenance location, clamp the rail clamp 3, and adjust the slide rail Mechanism 4, slewing mechanism 5, boom 6 and lifting mechanism 7, so that the hook 71 is located above the new spare part, and the spare part to be replaced is lifted by the wire rope 73 or the sling, and the slide rail mechanism 4, slewing mechanism 5, boom 6 and lifting mechanism 7 are adjusted again to lift the new spare part to the maintenance position. After completion, the slide rail mechanism 4, slewing mechanism 5, boom 6 and lifting mechanism 7 are adjusted, the rail clamp 3 is released, and the walking mechanism 2 is operated to walk to the level crossing and withdraw from the track to complete the maintenance and transportation work.

[0038] The above working principle is that the maintenance transport vehicle participates in the entire maintenance and transportation process. In actual application, only part of the process can be intercepted and used or used in batches according to actual needs.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A vehicle device for maintenance and transportation of railway high-voltage lines, comprising a vehicle frame (1), characterized in that: A walking mechanism (2) is fixedly provided below the vehicle frame (1), a slide rail mechanism (4) is welded to the bottom of the vehicle frame (1), and a driving device is fixedly provided via bolts, connecting plates are provided at the four corners of the vehicle frame (1), and a rail clamp (3) is fixedly provided on the connecting plate via bolts, a slewing mechanism (5) is connected to the top of the slide rail mechanism (4), a boom (6) is fixedly provided above the slewing mechanism (5), and a lifting mechanism (7) is fixedly provided on the front side of the boom (6).

2. The device for a railway high-voltage line area maintenance and transport vehicle according to claim 1, characterized in that: The vehicle frame (1) is made of welded steel plates, and the lower portion of the vehicle frame (1) is provided with an axis hole for the traveling mechanism (2) and a driving fixing bolt hole.

3. The device for a railway high-voltage line area maintenance and transport vehicle according to claim 1, characterized in that: The walking mechanism (2) comprises two walking wheels (21), a walking driving gear (22), a walking driving pinion (23), a three-in-one speed reducer (24), a main shaft (25) and two bearing seats (26). The two walking wheels (21) are respectively fixed to both sides of the main shaft (25) by bolts. The walking driving gear (22) is fixedly sleeved on the middle part of the main shaft (25) through a key connection and a shaft shoulder. The walking driving gear (22) is meshed and connected with the walking driving pinion (23). The walking driving pinion (23) is fixedly connected to the output shaft of the three-in-one speed reducer (24). The three-in-one speed reducer (24) is installed on the vehicle frame (1). The two bearing seats (26) are rotatably sleeved on the outer side of the main shaft (25), and the bearing seats (26) are fixed on the vehicle frame (1).

4. The device for transporting and maintaining railway high-voltage lines according to claim 1, characterized in that: The rail clamp (3) comprises a rail clamp main structure (31), a rail clamp leg (32), a hydraulic cylinder (33), a connecting base (34), an oil tank (35), a spring (36) and a connecting rod (37); the connecting base (34) is fixed to a connecting plate of a vehicle frame (1); the rail clamp leg (32) is fixed to the rail clamp main structure (31) via an axle pin; the spring (36) is fixed to the rail clamp main structure (31) via a connecting rod (37); and the connecting rod (37) and the hydraulic cylinder (33) are arranged on the rail clamp leg (32) via an axle pin.

5. The device for a railway high-voltage line area maintenance and transport vehicle according to claim 1, characterized in that: The slide rail mechanism (4) includes a slide rail rod (41), a slide plate (42), an electric push rod (43), a pin (44) and a lug (45). The slide rail rod (41) is fixed to the vehicle frame (1) by welding. The two sides of the slide rail rod (41) are symmetrically arranged to form a C-shaped groove. The slide plate (42) is slidably arranged in the C-shaped groove of the slide rail rod (41), and a lug (45) is provided on one side of the slide plate (42). The piston rod end of one end of the electric push rod (43) is provided with a pin (44), and the electric push rod (43) is connected to the lug (45) through the pin (44). The other end of the electric push rod (43) is provided on the vehicle frame (1) by a bolt.

6. The device for a railway high-voltage line area maintenance and transport vehicle according to claim 1, characterized in that: The rotary mechanism (5) comprises a rotary inner gear ring (51), a rotary pinion (52), a three-in-one reducer (53), a rotary support shaft (54) and a bearing rod (55). The rotary support shaft (54) and the three-in-one reducer (53) are both fixed to the upper part of the slide plate (42). The rotary support shaft (54) is rotatably connected to the rotary inner gear ring (51) through the bearing rod (55). The output end of the three-in-one reducer (53) is fixedly provided with a rotary pinion (52), and the rotary pinion (52) is meshedly connected to the rotary inner gear ring (51).

7. The device for a railway high-voltage line area maintenance and transport vehicle according to claim 1, characterized in that: The boom (6) includes a fixed arm (61), a second electric push rod (62) and a movable arm (63), wherein the fixed arm (61) is fixed to the upper part of the rotating inner gear ring (51) by means of a bolt connection, the second electric push rod (62) is rotatably connected between the movable arm (63) and the fixed arm (61) by means of an axle pin, and the rear end of the movable arm (63) is rotatably connected to the top end of the fixed arm (61).

8. The device for a railway high-voltage line area maintenance and transport vehicle according to claim 1, characterized in that: The lifting mechanism (7) comprises a hook (71), a hoist (72) and a steel wire rope (73); the hoist (72) is fixed to the front end of the movable arm (63) by means of bolts; one end of the steel wire rope (73) is fixedly wound around an output roller on the hoist (72); and the hook (71) is fixed to the other end of the steel wire rope (73) by means of a buckle.