Cable pulling device for subway power supply

Abstract

The utility model discloses a cable pulling device for subway power supply. The cable pulling device comprises a cart, rotating wheels, a take-up and pay-off mechanism, an adjusting mechanism and a push-pull unit. The take-up and pay-off mechanism is located between the adjusting mechanism and the push-pull unit and composed of a supporting frame, a take-up and pay-off wheel and an adjusting assembly, the take-up and pay-off wheel is rotationally connected with the supporting frame, and the adjusting assembly is used for adjusting the position of the cable. The adjusting mechanism comprises a limiting frame, a supporting plate and a connecting plate, the limiting frame is located at the end, away from the push rod, of the cart, the supporting plate can vertically move along the limiting frame, and the connecting plate penetrates through the opening of the vertical support to be connected with the supporting plate. The top of the supporting plate extends out of the vertical support and is rotationally connected with a supporting rod, and a limiting wheel is arranged on the supporting rod. According to the device, through mutual cooperation of all parts, rapid cable pulling, releasing and adjusting are achieved, and the working efficiency is improved. The take-up and pay-off mechanism facilitates cable position adjustment, and stability and safety are ensured. The adjusting mechanism can adjust the height and position of the supporting plate according to needs to meet the requirements of cable drawing of different lengths.

Description

Technical Field

[0001] This utility model specifically relates to a cable pulling device for subway power supply, belonging to the field of cable wiring technology. Background Technology

[0002] In subway construction, the stability and reliability of the power supply system are paramount. As a key component for transmitting electrical energy, the quality of subway power supply cables directly impacts the operational efficiency and safety of the entire subway system. Traditional cable laying methods often rely on manual pulling and positioning, which is not only inefficient but also makes it difficult to guarantee the accuracy and safety of cable laying. Especially in the complex environment of subway tunnels, manual operation is easily affected by space constraints and visual obstructions, leading to damage or excessive bending of cables during laying. Therefore, developing a cable pulling device for subway power supply that can automatically guide and tension cables, ensuring their smooth and safe laying to designated locations, is of great significance for improving the stability and construction efficiency of subway power supply systems.

[0003] With the acceleration of urbanization and the continuous advancement of subway construction, the demand for subway power supply cables is increasing daily. Traditional cable laying methods have many shortcomings, such as high labor costs, low laying efficiency, and poor safety. To overcome these shortcomings, people have begun to explore the use of mechanized and automated methods for cable laying. Subway power supply cable pulling devices, as a new type of auxiliary cable laying equipment, can effectively prevent cable damage or excessive bending during laying by precisely controlling the force and direction of the pulling wire. At the same time, this device also has advantages such as simple structure, convenient operation, and strong adaptability, and can be applied to the laying needs of cables of different specifications and lengths. Therefore, the research and development and application of subway power supply cable pulling devices are of great significance for promoting technological progress and industrial upgrading in the subway construction industry.

[0004] Patent CN219067693U discloses a cable pulling device for subway power supply. The device mainly consists of a base plate, a bracket, a cable drum, a cable, a rotating shaft, and a motor. The bracket is securely mounted on the top of one side of the base plate, while the cable drum rests on top of the base plate. The cable is tightly wound around the outer surface of the cable drum. A rotating shaft is embedded in the inner wall of the cable drum, with one end fixedly connected to the motor. Furthermore, a fixing assembly is provided between the cable drum and the rotating shaft. This device solves the problem of requiring multiple people to work together when replacing cables due to their weight, making cable replacement simpler and more convenient.

[0005] However, the above-mentioned devices mainly focus on facilitating cable replacement, but do not fully consider the issue of automatic adjustment of the cable winding height. During the cable winding process, the cable is prone to friction with the ground, which may affect the cable's service life and performance. This deficiency may have a certain impact on subsequent maintenance and safe operation of the cable. Therefore, it is necessary to develop a cable winding device for subway power supply. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a cable pulling device for subway power supply, which aims to solve the problem that the cable is easily rubbed against the ground during the pulling and winding process of the existing device, which affects the service life and performance of the cable.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] A cable pulling device for subway power supply includes a trolley and rotating wheels, with the rotating wheels symmetrically distributed on both sides of the bottom of the trolley; it also includes a cable winding and unwinding mechanism, an adjustment mechanism, and a push-pull unit, wherein the push-pull unit includes a push rod disposed at the end of the trolley, and the push rod is provided with a handle;

[0009] The take-up and release mechanism is located between the adjustment mechanism and the push-pull unit. The take-up and release mechanism includes a support frame, a take-up and release wheel, and an adjustment component located under the take-up and release wheel. The take-up and release wheel is rotatably connected to the support frame, and the adjustment component is used to adjust the appearance or entry position of the cable.

[0010] The adjustment mechanism includes a limit frame, a support plate, and a connecting plate. The limit frame includes two vertical supports and is located at the end of the trolley away from the push rod. The support plate is inserted into the limit frame and can move up and down along the limit frame. An opening is provided on the vertical support, and the connecting plate passes through the opening and connects to the support plate located on the vertical support. The top of the support plate extends out of the vertical support, and the part of the support plate extending out of the vertical support is rotatably connected to the support rod. A limit wheel is provided on the support rod.

[0011] The operator moves the trolley by pushing or pulling it using the push rod and handle of the push-pull unit. Symmetrically distributed rotating wheels at the bottom of the trolley ensure stability and flexibility during movement. The cable reel-in / reel-out mechanism activates when the cable needs to be released or retrieved. This mechanism includes a support frame, reel-in / reel-out wheels, and an adjustment assembly. The cable is wound around the reel-in / reel-out wheels, which are rotatably connected to the support frame, allowing the cable to rotate freely during release and reel-out. The adjustment assembly is used to adjust the cable's entry or exit position, ensuring that the cable follows a predetermined path when released or retrieved.

[0012] The adjustment mechanism also plays a crucial role. It includes a limit frame, a support plate, and a connecting plate. The limit frame, located at the end of the trolley furthest from the push rod, consists of two vertical supports. The support plate inserts into the limit frame and can move up and down along it to accommodate cables of different heights. Openings are provided on the vertical supports, through which the connecting plate connects to the support plate, ensuring its stability. The top of the support plate extends beyond the vertical supports and is rotatably connected to the support rod. Limit wheels are installed on the support rod to restrict the cable's movement path, preventing tangling or damage during cable release or retraction. During operation, the operator releases or retracts the cable as needed through the coordination of the adjustment mechanism and the cable retraction mechanism. Simultaneously, the cooperation between the trolley and the rotating wheels allows the entire device to move easily, improving work efficiency.

[0013] As a preferred embodiment, the adjustment mechanism also includes a threaded ring and a threaded rod. The threaded ring has an internal thread and is fixed to the connecting plate. The threaded rod is threadedly engaged with the threaded ring. The bottom end of the threaded rod is rotatably connected to the trolley, and the top end of the threaded rod is equipped with a drive motor, which drives the threaded rod to rotate.

[0014] As a preferred embodiment, the adjustment assembly includes a bar frame, a servo motor, a threaded screw, a sliding block, and a limiting mechanism. The support frame includes two vertically arranged fixed plates, with a take-up and release wheel disposed between the two fixed plates, and the fixed plates are rotatably connected to the take-up and release wheel.

[0015] A strip frame is also provided between the two fixed plates. A sliding groove is provided on the strip frame, and a threaded screw is provided in the sliding groove. A sliding ring is provided on the sliding block, and a thread is provided inside the sliding ring. The sliding ring is threadedly connected to the threaded screw. The limiting mechanism is provided on the sliding block.

[0016] As a preferred embodiment, the limiting mechanism includes a square block and a limiting channel. The square block is fixedly mounted on the top of the sliding block, and the limiting channel is mounted on the square block. The two ends of the limiting channel are a first limiting hole and a second limiting hole, respectively. The first limiting hole is mounted on the surface of the square block facing the adjusting mechanism, and the second limiting hole is mounted on the top surface of the square block.

[0017] As a preferred embodiment, a rotating shaft is mounted on the take-up and release reel, rotatably connected to a support frame. One end of the shaft is connected to a power motor, which is fixedly mounted on the support frame. The rotating shaft on the take-up and release reel, connected to the support frame via a rotatable connection, allows the shaft to rotate freely on the support frame. One end of the shaft is connected to the power motor, which, in turn, provides rotational power to the shaft. When the power motor starts, it drives the shaft to rotate. Because the shaft is connected to the take-up and release reel, the reel also rotates. Thus, by controlling the direction and speed of the power motor's rotation, the take-up and release actions of the reel can be achieved, meeting specific work requirements. The entire process automates power transmission and rotation control, improving work efficiency and ease of operation.

[0018] As a preferred option, the stroller is also equipped with a battery pack, which is connected to the power motor to provide power to the motor; the power motor is also connected to the controller.

[0019] As a preferred embodiment, the trolley end is provided with two vertical push rods, and the top of the push rods is provided with a bent handle, which includes a bent part and a straight part, and the bent part and the straight part are integrally formed.

[0020] As a preferred embodiment, the two vertical push rods are equipped with reinforcing crossbars, the ends of which are fitted onto the push rods and fixed thereto.

[0021] As a preferred embodiment, the take-up and release wheel includes a take-up and release body and limiting discs disposed on both sides of the take-up and release body. The take-up and release body is cylindrical and has several arc-shaped grooves.

[0022] As a preferred embodiment, the support rod is equipped with at least two limiting wheels. Two adjacent limiting wheels form a limiting zone, and each zone restricts only one cable during winding / unwinding. When winding or unwinding is required, the cable moves along the support rod. The two adjacent limiting wheels together form a limiting zone, which serves to position and restrict the cable. Specifically, when the cable passes through this limiting zone, the limiting wheels ensure that the cable does not deviate from the predetermined path during winding or unwinding, thus maintaining the cable's neat alignment and stable movement. Each limiting zone restricts only one cable, meaning each cable has its own independent limiting space, avoiding mutual interference and entanglement between cables. This design not only improves the efficiency of cable management but also ensures the safety and reliability of the cable during winding and unwinding. Through the setting of limiting wheels and limiting zones, the system can effectively control the movement of the cable, achieving neat winding and rapid unwinding, improving the convenience and efficiency of cable management.

[0023] This invention offers at least the following advantages: The device, through the coordinated operation of a trolley, rotating wheels, a cable reeling / laying mechanism, an adjusting mechanism, and a push-pull unit, enables rapid cable reeling and adjustment, significantly improving work efficiency. Furthermore, the support frame, reeling / laying wheels, and adjusting components in the cable reeling / laying mechanism allow for convenient adjustment of the cable's entry or exit position, ensuring stability and safety during the reeling / laying process and preventing cable friction with the ground. Moreover, the limiting frame, support plate, and connecting plate in the adjusting mechanism allow for adjustment of the support plate's height and position as needed, accommodating cable reeling requirements of varying lengths. Attached Figure Description

[0024] To reveal the technical details of the embodiments of this utility model, the accompanying drawings involved in the embodiments will be briefly described below. It should be emphasized that these drawings only present several embodiments of this utility model and should not be considered as defining the scope of the utility model. For those skilled in the art, other related drawings can still be derived based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This utility model Figure 1 Enlarged structural diagram of A in the middle;

[0027] Figure 3 This is a schematic diagram of the support plate structure of this utility model;

[0028] Figure 4 This utility model Figure 1 A magnified schematic diagram of the structure of B in the middle.

[0029] In the diagram, 1-trolley, 2-rotating wheel, 3-push rod, 4-battery assembly, 5-controller, 6-support frame, 7-retracting wheel, 8-power motor, 9-bar frame, 10-servo motor, 11-threaded screw, 12-sliding block, 13-sliding ring, 14-square block, 15-limiting hole, 16-limiting frame, 17-support plate, 18-support rod, 19-limiting wheel, 20-connecting plate, 21-threaded ring, 22-threaded rod, 23-drive motor. Detailed Implementation

[0030] The technical solution of this utility model is described in further detail below with reference to the accompanying drawings, but the scope of protection of this utility model is not limited to the following description.

[0031] In the following description, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. However, it should be understood that the present disclosure is not limited to the specific forms shown herein. Rather, it should be understood to encompass various variations, equivalents, and / or alternatives to the embodiments of the present disclosure. In illustrating the drawings, the same reference numerals will be used to denote similar components.

[0032] In the various embodiments of this disclosure, the terms "first," "second," "the first," or "the second" are intended to modify different components and not to indicate order and / or importance, nor do they constitute a limitation on the respective components. For example, a first user equipment and a second user equipment represent different user equipments, although they both fall under the category of user equipment. Similarly, a first component may be named a second component, and a second component may be named a first component, without changing their essential attributes within the scope of this disclosure.

[0033] It should be clarified that while the following description provides detailed specific information to aid in a comprehensive understanding of the exemplary embodiments, those skilled in the art will recognize that the exemplary embodiments can be implemented even without these specific details. For example, the system may be illustrated using block diagrams to avoid excessive detail that could obscure the clarity of the example. In other cases, to maintain the clarity of the example, unnecessary details of well-known processes, structures, and techniques may be omitted.

[0034] like Figure 1 As shown, a cable pulling device includes a trolley 1 and rotating wheels 2, with the rotating wheels 2 symmetrically distributed on both sides of the bottom of the trolley 1; it also includes a cable winding and unwinding mechanism, an adjustment mechanism, and a push-pull unit, wherein the push-pull unit includes a push rod 3 disposed at the end of the trolley 1, and a handle is provided on the push rod 3;

[0035] The take-up and release mechanism is located between the adjustment mechanism and the push-pull unit. The take-up and release mechanism includes a support frame 6, a take-up and release wheel 7, and an adjustment component located under the take-up and release wheel 7. The take-up and release wheel 7 is rotatably connected to the support frame 6, and the adjustment component is used to adjust the appearance or entry position of the cable.

[0036] The adjustment mechanism includes a limiting frame 16, a support plate 17, and a connecting plate 20. The limiting frame 16 includes two vertical supports and is located at the end of the trolley 1 away from the push rod 3. The support plate 17 is inserted into the limiting frame 16 and can move up and down along the limiting frame 16. An opening is provided on the vertical support, and the connecting plate 20 passes through the opening (which also serves as a groove for the connecting plate 20 to move up and down) and connects to the support plate 17 located on the vertical support. The top of the support plate 17 extends out of the vertical support, and the part of the support plate 17 extending out of the vertical support is rotatably connected to the support rod 18. A limiting wheel 19 is provided on the support rod 18. The support rod 18 is a horizontal rod, and its two ends are respectively connected to the top of the support plate 17.

[0037] This device uses a push-pull unit to push or pull the trolley 1, a cable winding and unwinding mechanism to handle the cable winding and unwinding, and an adjustment mechanism to effectively manage and guide the cable by adjusting the height and position of the support plate 17 and the function of the limit wheels 19. The entire device improves the efficiency and safety of pulling subway power supply cables, reduces manpower requirements, and ensures neat cable arrangement and prevents tangling.

[0038] In a preferred embodiment, such as Figure 3 As shown, the adjustment mechanism also includes a threaded ring 21 and a threaded rod 22. The threaded ring 21 has an internal thread and is fixed to the connecting plate 20. The threaded rod 22 is threadedly engaged with the threaded ring 21. The bottom end of the threaded rod 22 is rotatably connected to the trolley 1. For example, a limiting structure, such as a cavity, is set on the flat plate of the trolley 1. A disc is set at the bottom of the threaded rod 22 and placed in the cavity, ensuring that the disc can rotate in the cavity but will not detach from the cavity. This achieves the rotatable connection between the bottom of the threaded rod 22 and the trolley 1. A drive motor 23 is set at the top of the threaded rod 22. A mounting plate is set on the limiting frame 16, and the drive motor 23 is fixed to the mounting plate. The drive motor 23 drives the threaded rod 22 to rotate. By driving the threaded rod 22 to rotate through the drive motor 23, the threaded engagement between the threaded rod 22 and the threaded ring 21 causes the connecting plate 20 and the support plate 17 connected to it to move up and down, thereby achieving precise adjustment of the cable height.

[0039] Rotating the threaded rod 22 causes the connecting plate 20 to move. When the connecting plate 20 moves, it drives the support plate 17 to move. When the support plate 17 moves, it drives the limit wheel 19 to move through the support rod 18. In turn, the limit wheel 19 pushes the cable to move and rise, thereby achieving the purpose of adjusting the cable height. This improves the flexibility of the cable pulling device for subway power supply. The cable height can be adjusted according to the actual scenario. At the same time, the tension of the laid cable can also be adjusted, effectively avoiding the cable from contacting and rubbing against the ground. When the limit wheel 19 moves upward, the tension of the wire can be adjusted, and the cable height can be adjusted at the same time. When pulling the cable, the cable is prevented from contacting and rubbing against the ground.

[0040] During cable laying, the cable position and tension can be adjusted using the adjusting components. The cable is tightened, and with the assistance of the adjusting components, it is evenly wound up, and the cable tension can be adjusted. This device guides and tensions the cable, ensuring it is laid smoothly and safely to the designated location. When laying and installing subway power supply cables, it helps workers smoothly and safely pull the cable along the track or predetermined path, ensuring proper cable installation and reducing risks associated with manual operation.

[0041] In a preferred embodiment, the adjustment assembly includes a strip frame 9, a servo motor 10, a threaded screw 11, a sliding block 12, and a limiting mechanism. The support frame 6 includes two vertically arranged fixed plates, with a take-up and release wheel 7 positioned between them. The fixed plates are rotatably connected to the take-up and release wheel 7. An outward-folding portion is provided at the bottom of the fixed plates, and this outward-folding portion is fixedly connected to the trolley 1, for example, by riveting. The take-up and release wheel 7 is used to store the cable, thereby enabling cable pulling. By fixing one end of the cable, the rotation of the take-up and release wheel 7 can adjust the tension between the cable and the take-up and release wheel 7, preventing the cable from rubbing against the ground during the take-up and release process.

[0042] A strip frame 9 is also provided between the two fixed plates. A sliding groove is provided on the strip frame 9. A threaded screw 11 is provided in the sliding groove. A sliding ring 13 is provided on the sliding block 12. The sliding ring 13 has a thread inside. The sliding ring 13 is threadedly connected to the threaded screw 11. The limiting mechanism is provided on the sliding block 12.

[0043] The servo motor 10 drives the threaded screw 11 to rotate. The threaded screw 11 engages with the sliding ring 13, causing the sliding block 12 and the limiting mechanism connected to it to move left and right on the strip frame 9, so that the cable is evenly wound on the take-up and unwrap wheel 7, or the cable is unwrapped, thereby achieving precise adjustment of the cable entry and exit positions.

[0044] In a preferred embodiment, such as Figure 2 As shown, the limiting mechanism includes a square block 14 and a limiting channel. The square block 14 is fixedly mounted on the top of the sliding block 12, and the limiting channel is mounted on the square block 14. The two ends of the limiting channel are a first limiting hole 15 and a second limiting hole 15, respectively. The first limiting hole 15 is located on the surface of the square block 14 facing the adjusting mechanism, and the second limiting hole 15 is located on the top surface of the square block 14. The cable passes through the limiting channel and can exit through either the first limiting hole 15 or the second limiting hole 15 as needed, achieving precise control over the cable's path. To facilitate cable entry, the square block 14 can be composed of two parts joined together by screws to form the cable-passing limiting channel. Generally, the limiting channel is arc-shaped to facilitate cable passage.

[0045] In a preferred embodiment, a rotating shaft is provided on the take-up / delivery wheel 7, and the rotating shaft is rotatably connected to the support frame 6 (fixed plate). A bearing can be provided at the connection between the rotating shaft and the support frame 6 to facilitate smooth rotation. One end of the rotating shaft is connected to a power motor 8, which is fixedly mounted on the support frame 6. The power motor 8 drives the rotating shaft to rotate, thereby driving the take-up / delivery wheel 7 to rotate, realizing the take-up / delivery operation of the cable.

[0046] In a preferred embodiment, the trolley 1 is further equipped with a battery assembly 4, which is connected to the power motor 8 to provide power to the power motor 8; the power motor 8 is also connected to the controller 5. The battery assembly 4 provides power to the power motor 8, and the controller 5 remotely controls the start, stop, and rotation direction of the power motor 8, thereby realizing remote control of cable retraction and extension. In addition, the battery assembly 4 can also supply power to other power components of the device, such as the drive motor 23 and the servo motor 10.

[0047] In a preferred embodiment, the trolley 1 has two vertical push rods 3 at its end, and a bent handle is provided at the top of the push rod 3. The handle includes a bent part and a straight part, which are integrally formed. The operator holds the handle to push or pull the trolley 1 to move it.

[0048] In a preferred embodiment, the two vertical push rods 3 are provided with reinforcing crossbars, the ends of which are fitted onto and fixed to the push rods 3. The reinforcing crossbars enhance the stability of the push rods 3 and prevent them from bending or deforming under stress.

[0049] In a preferred embodiment, the take-up and release wheel 7 includes a take-up and release body and limiting discs disposed on both sides of the take-up and release body. The take-up and release body is cylindrical and has a plurality of arc-shaped grooves. The cable is wound around the take-up and release body, the limiting discs prevent the cable from slipping or popping out during the take-up and release process, and the arc-shaped grooves help to arrange the cable neatly.

[0050] In a preferred embodiment, reference Figure 4 The support rod 18 is equipped with at least two limiting wheels 19. Two adjacent limiting wheels 19 form a limiting range, and a limiting range only limits the cable when it is being wound up or unwound. During the winding up and unwound process, the cable is limited within the limiting range formed by two adjacent limiting wheels 19, which avoids the crossing and tangling of the cables.

[0051] This cable pulling device uses a trolley 1 as a carrier, and is moved by rotating wheels 2, with the direction controlled by a handle on the push-pull unit. The core of the device is the cable winding and unwinding mechanism, which consists of a support frame 6, winding and unwinding wheels 7, and an adjustment assembly. The winding and unwinding wheels 7 are driven by a motor 8 to rotate the shaft and wind up or unwind the cable. The adjustment assembly is driven by a servo motor 10 to drive a threaded screw 11, which in turn moves a sliding block 12 and a limiting mechanism laterally, precisely adjusting the cable entry and exit positions to ensure even winding or release. The adjustment mechanism is driven by a motor 23 to rotate a threaded rod 22, causing the connecting plate 20 to lift and lower the support plate 17. This, in turn, adjusts the cable height and tension via a support rod 18 and a limiting wheel 19, preventing friction with the ground. The limiting channel guides the cable's path through first and second limiting holes 15, and works with the limiting wheel 19 to achieve smooth laying. The battery assembly 4 powers the power components, and combined with remote control, automates the winding, unwinding, height, and position adjustment operations. All mechanisms work together to guide, tension, wind up, unwind, and adjust the height of the cable, ensuring efficient, neat, and safe cable laying in the subway power supply system.

[0052] Although the preferred embodiments of this utility model have been described in detail, those skilled in the art, once they understand its basic innovative concept, can still make further adjustments and improvements to these embodiments. Therefore, the appended claims are intended to cover the preferred embodiments, as well as all changes and improvements that fall within the scope of this utility model. The above description is merely an example of preferred embodiments of this utility model and is not intended to limit its scope. It should be clearly understood that any modifications, equivalent substitutions, or improvements made under the guidance of the spirit and principles of this utility model should be considered as included within the protection scope of this utility model.

Claims

1. A cable pulling device for subway power supply, comprising a trolley and rotating wheels, the rotating wheels being symmetrically distributed on both sides of the bottom of the trolley; characterized in that, It also includes a wire take-up and unwinding mechanism, an adjustment mechanism, and a push-pull unit, wherein the push-pull unit includes a push rod located at the end of the trolley, and the push rod is provided with a handle; The take-up and release mechanism is located between the adjustment mechanism and the push-pull unit. The take-up and release mechanism includes a support frame, a take-up and release wheel, and an adjustment component located under the take-up and release wheel. The take-up and release wheel is rotatably connected to the support frame, and the adjustment component is used to adjust the appearance or entry position of the cable. The adjustment mechanism includes a limit frame, a support plate, and a connecting plate. The limit frame includes two vertical supports and is located at the end of the trolley away from the push rod. The support plate is inserted into the limit frame and can move up and down along the limit frame. An opening is provided on the vertical support, and the connecting plate passes through the opening and connects to the support plate located on the vertical support. The top of the support plate extends out of the vertical support, and the part of the support plate extending out of the vertical support is rotatably connected to the support rod. A limit wheel is provided on the support rod.

2. The cable pulling device for subway power supply as described in claim 1, characterized in that: The adjustment mechanism also includes a threaded ring and a threaded rod. The threaded ring has an internal thread and is fixed on the connecting plate. The threaded rod is threadedly engaged with the threaded ring. The bottom end of the threaded rod is rotatably connected to the trolley, and the top end of the threaded rod is equipped with a drive motor, which drives the threaded rod to rotate.

3. A cable pulling device for subway power supply as described in claim 1 or 2, characterized in that: The adjustment assembly includes a bar frame, a servo motor, a threaded screw, a sliding block, and a limiting mechanism. The support frame includes two vertically arranged fixed plates, with a take-up and release wheel between the two fixed plates. The fixed plates are rotatably connected to the take-up and release wheel. A strip frame is also provided between the two fixed plates. A sliding groove is provided on the strip frame, and a threaded screw is provided in the sliding groove. A sliding ring is provided on the sliding block, and a thread is provided inside the sliding ring. The sliding ring is threadedly connected to the threaded screw. The limiting mechanism is provided on the sliding block.

4. A cable pulling device for subway power supply as described in claim 3, characterized in that: The limiting mechanism includes a square block and a limiting channel. The square block is fixedly mounted on the top of the sliding block, and the limiting channel is mounted on the square block. The two ends of the limiting channel are a first limiting hole and a second limiting hole, respectively. The first limiting hole is mounted on the surface of the square block facing the adjusting mechanism, and the second limiting hole is mounted on the top surface of the square block.

5. A cable pulling device for subway power supply as described in claim 1, 2, or 4, characterized in that: A rotating shaft is installed on the take-up and take-down wheel, and the rotating shaft is rotatably connected to the support frame; one end of the rotating shaft is connected to a power motor, and the power motor is fixedly installed on the support frame.

6. A cable pulling device for subway power supply as described in claim 5, characterized in that: The stroller is also equipped with a battery pack, which is connected to the motor to provide power to the motor; the motor is also connected to the controller.

7. A cable pulling device for subway power supply as described in claim 1, characterized in that: The trolley has two vertical push rods at the end, and a bent handle at the top of the push rod. The handle consists of a bent part and a straight part, which are integrally formed.

8. A cable pulling device for subway power supply as described in claim 7, characterized in that: The two vertical push rods are equipped with reinforcing crossbars, the ends of which are fitted onto the push rods and fixed thereto.

9. A cable pulling device for subway power supply as described in claim 1, 2, 4, 6, 7, or 8, characterized in that: The take-up and release wheel includes a take-up and release body and limiting discs set on both sides of the take-up and release body. The take-up and release body is cylindrical and has several arc-shaped grooves.

10. A cable pulling device for subway power supply as described in claim 1, 2, 4, 6, 7, or 8, characterized in that: The support rod is equipped with at least two limit wheels. Two adjacent limit wheels form a limit interval. A limit interval is used to limit the retraction / unwinding of only one cable.

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