New energy long rail tractor

Abstract

The utility model provides a new energy long rail tractor belongs to new energy track laying equipment technical field, this new energy long rail tractor includes tractor car body, battery pack, hoist cooperation piece and hoist device, battery pack dismounts formula installation in the top of tractor car body, and is used to provide electric energy to new energy long rail tractor, hoist cooperation piece with battery pack fixed connection, hoist device installs in tractor car body, and is used to cooperate with hoist cooperation piece to hoist and transport battery pack, the utility model discloses a new energy long rail tractor can reduce the difficulty of new energy long rail tractor battery replacement, to improve the battery pack replacement efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of new energy track laying equipment technology, and relates to a new energy long steel rail traction vehicle. Background Technology

[0002] Currently, most sections of the plateau railway are located at altitudes above 3,000 meters, with tunnels accounting for a very high proportion. Due to the characteristics of the plateau environment, such as low pressure, high cold, thin air, and poor air circulation in tunnels, new energy long-rail traction vehicles powered by internal combustion engines cannot operate well and are gradually being replaced by new energy long-rail traction vehicles powered by batteries.

[0003] However, existing new energy long-rail tractors face numerous technical challenges when swapping batteries in single-track tunnels. The narrow space of single-track tunnels restricts the entry or operation of auxiliary equipment, making it difficult for ordinary new energy track-laying equipment to swap batteries inside tunnels, thus affecting the battery swapping efficiency. Utility Model Content

[0004] The problem this invention aims to solve is how to reduce the difficulty of replacing batteries in new energy long-rail tractors, so as to improve the efficiency of battery pack replacement.

[0005] To address the aforementioned problems, this utility model provides a new energy long-rail tractor, comprising a tractor body, a battery pack, a lifting assembly, and a lifting device; the battery pack is detachably installed on the top of the tractor body and is used to provide power to the new energy long-rail tractor; the lifting assembly is fixedly connected to the battery pack; the lifting device is installed on the tractor body and is used to cooperate with the lifting assembly to lift the battery pack.

[0006] Optionally, the lifting assembly is a lifting ring or hook installed on the top of the battery pack.

[0007] Optionally, the lifting assembly includes a frame and a retaining ring, the battery pack is housed in the frame, and the retaining ring is fixedly connected to the frame.

[0008] Optionally, the battery pack has multiple battery packs, which are arranged sequentially along the length of the tractor body.

[0009] Optionally, the battery pack includes a temperature control module and a temperature regulating device electrically connected to the temperature control module. The temperature control module is used to monitor the temperature of the battery pack and control the operation of the temperature regulating device.

[0010] Optionally, the lifting device is a rotatable cantilever crane, which is used to lift the battery pack to the outside of the tractor body or to the top of the tractor body.

[0011] Optionally, the new energy long rail tractor also includes a mounting frame, which is installed on the top of the tractor body; the battery pack and the lifting device are respectively located on both sides of the mounting frame along the length of the tractor body.

[0012] Optionally, the new energy long rail tractor also includes a rail clamping device; the rail clamping device includes a connecting arm, a clamping unit, a first driving device, and a second driving device; one end of the connecting arm is rotatably connected to the rear of the tractor body, and the other end is located on the outside of the tractor body and slidably connected to two clamping units spaced apart along the width direction of the tractor body; the first driving device is used to drive the connecting arm to rotate relative to the tractor body to adjust the height of the clamping unit; the second driving device is used to drive the two clamping units to move closer or further apart from each other.

[0013] Optionally, the new energy long rail tractor also includes a lifting device, a tire running mechanism, and a track running mechanism; the lifting device is connected to the tractor body and is used to lift the tractor body; the tire running mechanism and the track running mechanism are both connected to the tractor body and are used to drive the tractor body to move; and at least one of the tire running mechanism and the track running mechanism can be lifted relative to the tractor body.

[0014] Optionally, the new energy long-rail tractor also includes a railway guiding mechanism, which includes a telescopic sleeve, a third drive device, a fourth drive device, and wheel rails; one end of the telescopic sleeve is connected to the tractor body, and the other end is connected to two wheel rails spaced apart along the width direction of the tractor body; the third drive device is used to drive the telescopic sleeve to extend or shorten; the fourth drive device is used to drive the wheel rails to rotate.

[0015] Compared with related technologies, the beneficial effects of this utility model are as follows:

[0016] When the battery pack of a new energy long-rail tractor needs replacement, the battery pack is mounted on top of the tractor body, providing ample operating space for workers to quickly secure and detach it from the vehicle, significantly reducing the difficulty of the replacement. Furthermore, the lifting assembly is securely connected to the battery pack and works in conjunction with the lifting device, allowing workers to easily lift and remove the battery pack from the tractor body. After replacing it with a new battery pack, it is then lifted back into the tractor body and secured. This design reduces manpower, further lowering the difficulty of the replacement and effectively improving the battery replacement efficiency of the new energy long-rail tractor. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the new energy long steel rail tractor according to an embodiment of the present utility model. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the structure of the new energy long steel rail tractor according to an embodiment of the present utility model. Figure 2 ;

[0019] Figure 3 This is a structural schematic diagram of the lifting assembly according to an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram showing the connection between the temperature control module and the temperature adjustment device in an embodiment of this utility model;

[0021] Figure 5 This is a schematic diagram of the rail clamping device according to an embodiment of the present utility model;

[0022] Figure 6 This is a schematic diagram of the railway guide mechanism according to an embodiment of the present utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 100. Tractor body; 200. Battery pack; 201. Temperature control module; 2011. Temperature sensor; 2012. Controller; 202. Temperature regulating device; 2021. Heating film; 2022. Fan; 300. Lifting assembly; 301. Frame; 302. Fixing ring; 400. Lifting device; 500. Mounting bracket; 600. Rail clamping device; 601. Connecting arm; 602. Clamping unit; 603. First drive device; 604. Second drive device; 605. Rotating arm; 700. Lifting device; 800. Tire traveling mechanism; 900. Track traveling mechanism; 110. Railway guiding mechanism; 1101. Telescopic sleeve; 1102. Third drive device; 1103. Wheel and rail; 1104. Fourth drive device; 1105. Auxiliary frame. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0026] In the attached figures, the Z-axis represents the vertical direction, i.e., up and down, with the positive direction of the Z-axis representing up and the negative direction representing down. The X-axis represents the horizontal direction and is designated as the front and back position, with the positive direction of the X-axis representing the front and the negative direction representing the back. The Y-axis represents the left and right position, with the positive direction of the Y-axis representing the left and the negative direction representing the right. It should be noted that the aforementioned representations of the Z, Y, and X axes are merely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this application.

[0027] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0028] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0029] like Figure 1 , 2As shown, this utility model provides a new energy long rail tractor, including a tractor body 100, a battery pack 200, a lifting assembly 300, and a lifting device 400; the battery pack 200 is detachably installed on the top of the tractor body 100 and is used to provide electrical energy to the new energy long rail tractor; the lifting assembly 300 is fixedly connected to the battery pack 200; the lifting device 400 is installed on the tractor body 100 and is used to cooperate with the lifting assembly 300 to lift the battery pack 200.

[0030] Specifically, such as Figure 1 , 2 As shown, the battery pack 200 is detachably installed at the top center or rear center of the tractor body 100 to provide power to the new energy long-rail tractor. The lifting device 400 is installed behind the cab and on the side of the battery pack 200 facing the cab. The lifting device 400 is used to lift the battery pack 200 to the outside of the tractor body 100 or to the top of the vehicle body.

[0031] In this embodiment, when the battery pack 200 of the new energy long-rail tractor needs to be replaced, since the battery pack 200 is installed on top of the tractor body 100, the operator has sufficient operating space to quickly fix and separate the battery pack 200 from the tractor body 100, thus significantly reducing the difficulty of replacement. Furthermore, the lifting assembly 300 is fixedly connected to the battery pack 200 and works in conjunction with the lifting device 400, allowing the operator to easily lift and remove the battery pack 200 from the tractor body 100. After replacing it with a new battery pack 200, it is then lifted back to the tractor body 100 and secured. This design reduces manpower input, further lowering the difficulty of replacement and effectively improving the battery replacement efficiency of the new energy long-rail tractor.

[0032] In this embodiment, the material of the tractor body 100 is Q355E, Q420E, or Q460E. Because these materials possess high strength and low-temperature toughness, they can adapt to the cold environment of high-altitude regions, thereby reducing the risk of brittle fracture due to low temperatures and improving the safety and reliability of the tractor body 100 under extreme conditions.

[0033] Optionally, the lifting assembly 300 is a lifting ring or hook installed on the top of the battery pack 200.

[0034] Specifically, the number of lifting fittings 300 can be one, two, or three, etc., without restriction, depending on actual needs. For example... Figure 1 As shown, there are multiple lifting fittings 300, which are evenly distributed on the top of the battery pack 200.

[0035] In this optional embodiment, the design of the lifting ring or hook provides a reliable lifting connection point directly for the battery pack 200. Since the lifting ring or hook is located at the top of the battery pack 200, its high position and relatively uniform force distribution ensure the overall balance and stability of the battery pack 200 during lifting, preventing tilting or damage caused by uneven force. Furthermore, lifting rings and hooks are common lifting connectors with standardized interfaces and high versatility, enabling quick integration with various lifting equipment, thereby improving the operational efficiency and safety of the battery pack 200 during lifting.

[0036] Optionally, the lifting assembly 300 includes a frame 301 and a fixing ring 302, with the battery pack 200 housed in the frame 301 and the fixing ring 302 fixedly connected to the frame 301.

[0037] Specifically, such as Figure 3 As shown, the lower end of the frame 301 is supported on the tractor body 100, and the upper end of the frame 301 is provided with an inlet and outlet. The battery pack 200 can enter or exit the frame 301 through the inlet and outlet. The fixing ring 302 is fixed to the top of the frame 301. The number of the fixing rings can be one, two or three, etc., which is not limited here and depends on the actual needs.

[0038] In this optional embodiment, since the battery pack 200 is housed within the frame 301 and the fixing ring 302 is fixedly connected to the frame 301, this design allows the battery pack 200 to be supported and secured as a whole by the frame 301 during lifting. The frame 301 provides additional structural protection for the battery pack 200, preventing damage from external impacts during lifting, handling, or installation. Simultaneously, the fixed connection between the fixing ring 302 and the frame 301 ensures even force distribution during lifting, avoiding structural deformation or damage caused by excessive localized stress, thereby improving the safety and reliability of the battery pack 200 during operation. Furthermore, this structure facilitates quick coordination with the lifting device 400, improving work efficiency.

[0039] It should be understood that, since the bottom of the frame 301 is hollow, the bottom of the battery pack 200 and the top of the tractor body 100 can still be connected by connecting lugs and bolts.

[0040] Optionally, there are multiple battery packs 200, and the multiple battery packs 200 are arranged sequentially along the length of the tractor body 100.

[0041] It should be noted that the length of the tractor body 100 is as follows: Figure 1 The direction of the X-axis.

[0042] Specifically, the number of battery packs 200 can be two, three, or four, etc., without limitation, depending on actual needs. For example... Figure 1 As shown, there are three battery packs 200, which are arranged sequentially on the top of the tractor body 100 along the length of the tractor body 100.

[0043] In this optional embodiment, multiple battery packs 200 are arranged sequentially along the length of the tractor body 100. This layout makes full use of the space resources of the tractor body 100, making the arrangement of the battery packs 200 more compact and orderly. By arranging them along the length of the tractor body 100, the total capacity of the battery packs 200 can be effectively increased, thereby providing a longer driving range or stronger power support for new energy long-rail tractors.

[0044] Optionally, the battery pack 200 includes a temperature control module 201 and a temperature regulating device 202 electrically connected to the temperature control module 201. The temperature control module 201 is used to monitor the temperature of the battery pack 200 and control the operation of the temperature regulating device 202.

[0045] Specifically, such as Figure 4 As shown, the battery pack 200 is a lithium iron phosphate battery pack 200, which integrates a temperature control module 201 and a temperature regulation device 202 electrically connected to it. Specifically, the temperature control module 201 consists of a temperature sensor 2011 and a controller 2012. The function of the temperature sensor 2011 is to monitor the temperature status of the battery pack 200 in real time and transmit the monitored temperature data to the controller 2012. The controller 2012 is electrically connected to both the temperature sensor 2011 and the temperature regulation device 202, and its core function is to determine whether to start or stop the temperature regulation device 202 based on a preset temperature threshold and temperature change rate.

[0046] Specifically, such as Figure 4 As shown, the temperature regulation device 202 includes a heating film 2021 and a fan 2022, both of which are electrically connected to the controller 2012. The heating film 2021 can rapidly raise the temperature of the battery pack 200 in low-temperature environments, effectively improving the battery's low-temperature performance and preventing reduced charging and discharging efficiency and capacity decay caused by low temperatures, thereby significantly extending the battery's lifespan. Simultaneously, the fan 2022 dissipates heat through forced convection in high-temperature environments, preventing performance degradation or thermal runaway due to excessively high temperatures, ensuring the battery's safety and stability under high-temperature conditions. This temperature control design, combining heating and heat dissipation functions, not only optimizes the battery's charging and discharging performance but also significantly improves the reliability and lifespan of the battery pack 200 under complex operating conditions.

[0047] Optionally, the lifting device 400 is a rotatable cantilever crane, which is used to lift the battery pack 200 to the outside of the tractor body 100 or to the top of the tractor body 100.

[0048] Specifically, a cantilever crane includes a fixed base, a rotatable cantilever, and a lifting mechanism. The fixed base is used to securely install the cantilever crane, the rotatable cantilever can rotate 360° horizontally, and it can operate smoothly through a motor drive and gear transmission system. The lifting mechanism is equipped with a hook, wire rope, and winch, and has sufficient lifting capacity to meet the lifting needs of goods of different weights.

[0049] Optionally, the new energy long rail tractor also includes a mounting frame 500, which is mounted on the top of the tractor body 100; the battery pack 200 and the lifting device 400 are respectively located on both sides of the mounting frame 500 along the length of the tractor body 100.

[0050] It is important to understand that the mounting frame 500 is a structure used by new energy long steel rail tractors to install components such as hydraulic pumps.

[0051] Specifically, such as Figure 1 As shown, the mounting bracket 500 is installed on the top of the tractor body 100 and is located in the middle and slightly forward position; the battery pack 200 and the lifting device 400 are located on the front and rear sides of the mounting bracket 500, respectively. In this way, by placing the battery pack 200 and the lifting device 400 on both sides of the mounting bracket 500, the space of the tractor body 100 can be utilized more efficiently, making the space of the tractor body 100 more compact.

[0052] Optionally, the new energy long rail tractor also includes a rail clamping device 600; the rail clamping device 600 includes a connecting arm 601, a clamping unit 602, a first driving device 603, and a second driving device 604; one end of the connecting arm 601 is rotatably connected to the rear of the tractor body 100, and the other end is located outside the tractor body 100 and slidably connected to two clamping units 602 spaced apart along the width direction of the tractor body 100; the first driving device 603 is used to drive the connecting arm 601 to rotate relative to the tractor body 100 to adjust the height of the clamping unit 602; the second driving device 604 is used to drive the two clamping units 602 to move closer or further apart from each other.

[0053] It should be noted that the width direction of the tractor body 100 is as follows: Figure 2 The direction of the Y-axis.

[0054] Specifically, such as Figure 5As shown, in the structure of the rail clamping device 600, the upper end of the connecting arm 601 is rotatably connected to the rear of the tractor body 100 via a rotating arm 605. The lower end of the connecting arm 601 is located outside the tractor body 100 and is slidably connected to two clamping units 602 spaced apart along the width direction of the tractor body 100. The clamping unit 602 is a rail clamp. In use, after the rail passes through the rail clamp, by inserting a wedge between the rail and the inner wall of the rail clamp, the rail can be restricted from continuing to move relative to the rail clamp, thereby fixing the rail to the rail. The first driving device 603 is a telescopic cylinder, used to drive the connecting arm 601 to rotate relative to the tractor body 100 to adjust the height of the clamping unit 602. The second driving device 604 is a bidirectional telescopic cylinder, whose two telescopic ends are respectively driven to connect to the two clamping units 602, used to drive the two clamping units to move closer or further apart, thereby adapting to the laying of tracks with different widths.

[0055] In this optional embodiment, when using the rail clamping device 600, the height of the clamping unit 602 is first adjusted by the first driving device 603 to match the position of the rail. Then, the second driving device 604 causes the two clamping units 602 to move closer or further apart to match the positions of the two rails, thereby allowing the two rails to smoothly enter or exit the clamping unit 602. After the rails smoothly enter the clamping unit 602, wedges are used to fix the rails and the clamping unit 602.

[0056] Optionally, the new energy long rail tractor also includes a lifting device 700, a tire traveling mechanism 800, and a track traveling mechanism 900; the lifting device 700 is connected to the tractor body 100 and is used to lift the tractor body 100; the tire traveling mechanism 800 and the track traveling mechanism 900 are both connected to the tractor body 100 and are used to drive the tractor body 100 to move; and at least one of the tire traveling mechanism 800 and the track traveling mechanism 900 can be lifted or lowered relative to the tractor body 100.

[0057] Specifically, such as Figure 1 As shown, the new energy long steel rail tractor includes two tire running mechanisms 800, one at the front and one at the rear, and each tire running mechanism 800 has two synchronously moving wheels; one track running mechanism 900 is located between the two tire running mechanisms 800, and each track running mechanism 900 has two synchronously moving track wheels; lifting devices 700 are vertically arranged at the four corners of the tractor body 100, working together to adjust the height of the vehicle.

[0058] In this optional embodiment, the new energy long-rail tractor can flexibly switch its travel mode according to different working conditions. When rapid movement is required, the tire-running mechanism 800 can serve as the primary drive mechanism, utilizing its high speed and flexibility for long-distance transfer; while in complex construction sites or situations requiring greater traction, the track-running mechanism 900 can provide stronger grip and stability. Since at least one of the tire-running mechanism 800 and the track-running mechanism 900 can be raised or lowered relative to the tractor body 100, after the entire vehicle is supported by the lifting device 700, adjusting the height of the tractor body 100 can achieve the contact state between the tire-running mechanism 800 and the track-running mechanism 900 and the ground, thereby realizing the switching between the tire-running mechanism 800 and the track-running mechanism 900.

[0059] Optionally, the new energy long-rail tractor also includes a railway guiding mechanism 110, which includes a telescopic sleeve 1101, a third drive device 1102, a fourth drive device 1104, and wheel rails 1103. One end of the telescopic sleeve 1101 is connected to the tractor body 100, and the other end is connected to two wheel rails 1103 spaced apart along the width direction of the tractor body 100. The third drive device 1102 is used to drive the telescopic sleeve 1101 to extend or shorten. The fourth drive device 1104 is used to drive the wheel rails 1103 to rotate.

[0060] Specifically, such as Figure 6 As shown, in the structure of the railway guide mechanism 110, the upper end of the telescopic sleeve 1101 is connected to the chassis of the tractor body 100, and the lower end of the telescopic sleeve 1101 is connected to two wheel rails 1103 through the auxiliary frame 1105; the third drive device 1102 is a telescopic cylinder, which is used to drive the telescopic sleeve 1101 to extend or retract; the fourth drive device 1104 is a drive motor, which is used to drive the wheel rails 1103 to rotate.

[0061] In this optional embodiment, the telescopic sleeve 1101 is first controlled by the third drive device 1102 to extend and retract, so that the two wheel rails 1103 can accurately contact the rail and maintain a stable contact state. Subsequently, the wheel rails 1103 are driven to rotate by the fourth drive device 1104, thereby guiding the vehicle to pass smoothly and easily through the railway turnout.

[0062] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A new energy long rail tractor, characterized in that, The system includes a tractor body (100), a battery pack (200), a lifting assembly (300), and a lifting device (400). The battery pack (200) is detachably installed on the top of the tractor body (100) and is used to provide power to the new energy long rail tractor. The lifting assembly (300) is fixedly connected to the battery pack (200). The lifting device (400) is installed on the tractor body (100) and is used to cooperate with the lifting assembly (300) to lift the battery pack (200).

2. The new energy long rail tractor of claim 1, wherein, The lifting assembly (300) is a lifting ring or hook installed on the top of the battery pack (200).

3. The new energy long rail tractor of claim 1, wherein, The lifting assembly (300) includes a frame (301) and a fixing ring (302), the battery pack (200) is housed in the frame (301), and the fixing ring (302) is fixedly connected to the frame (301).

4. The new energy long-rail tractor according to claim 1, characterized in that, The battery pack (200) has multiple units, and the multiple battery packs (200) are arranged sequentially along the length direction of the tractor body (100).

5. The new energy long-rail tractor according to any one of claims 1-4, characterized in that, The battery pack (200) includes a temperature control module (201) and a temperature regulating device (202) electrically connected to the temperature control module (201). The temperature control module (201) is used to monitor the temperature of the battery pack (200) and control the operation of the temperature regulating device (202).

6. The new energy long-rail tractor according to claim 1, characterized in that, The lifting device (400) is a rotatable cantilever crane, which is used to lift the battery pack (200) to the outside of the tractor body (100) or to the top of the tractor body (100).

7. The new energy long-rail tractor according to claim 1, characterized in that, It also includes a mounting bracket (500) mounted on the top of the tractor body (100); the battery pack (200) and the lifting device (400) are located on both sides of the mounting bracket (500) along the length of the tractor body (100).

8. The new energy long-rail tractor according to claim 1, characterized in that, It also includes a rail clamping device (600); the rail clamping device (600) includes a connecting arm (601), a clamping unit (602), a first driving device (603), and a second driving device (604); one end of the connecting arm (601) is rotatably connected to the rear of the tractor body (100), and the other end is located outside the tractor body (100) and slidably connected to two clamping units (602) spaced apart along the width direction of the tractor body (100); the first driving device (603) is used to drive the connecting arm (601) to rotate relative to the tractor body (100) to adjust the height of the clamping unit (602); the second driving device (604) is used to drive the two clamping units (602) to move closer to or further away from each other.

9. The new energy long-rail tractor according to claim 1, characterized in that, It also includes a lifting device (700), a tire traveling mechanism (800), and a track traveling mechanism (900); the lifting device (700) is connected to the tractor body (100) and is used to lift the tractor body (100); the tire traveling mechanism (800) and the track traveling mechanism (900) are both connected to the tractor body (100) and are used to drive the tractor body (100) to move; and at least one of the tire traveling mechanism (800) and the track traveling mechanism (900) can be lifted or lowered relative to the tractor body (100).

10. The new energy long-rail tractor according to claim 1, characterized in that, It also includes a railway guiding mechanism (110), which includes a telescopic sleeve (1101), a third drive device (1102), a fourth drive device (1104), and wheel rails (1103); one end of the telescopic sleeve (1101) is connected to the tractor body (100), and the other end is connected to two wheel rails (1103) spaced apart along the width direction of the tractor body (100); the third drive device (1102) is used to drive the telescopic sleeve (1101) to extend or shorten; the fourth drive device (1104) is used to drive the wheel rails (1103) to rotate.

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