A tube pulling and bundle passing system and trolley

Abstract

The application provides a pipe pulling and beam penetrating system and a trolley, and belongs to the technical field of railway bridges. The pipe pulling and beam penetrating system comprises a fixed beam, a moving beam, two chain wheels, a driver, a first transmission rod, a main transmission mechanism, an auxiliary transmission mechanism and a second transmission rod. The driver is installed on the fixed beam or the moving beam. The first transmission rod is connected with the driver and is in transmission connection with the chain wheels. The main transmission mechanism is provided with a transmission assembly. The auxiliary transmission mechanism is installed on the main transmission mechanism and corresponds to the other chain wheel. The auxiliary transmission mechanism is in transmission connection with the main transmission mechanism and is in sliding connection with the main transmission mechanism. The auxiliary transmission mechanism is provided with a transmission assembly. The second transmission rod is arranged in parallel and at intervals with the first transmission rod and is in transmission connection with the other chain wheel at one end. The other end of the second transmission rod is connected with the transmission assembly on the auxiliary transmission mechanism. The pipe pulling and beam penetrating system provided by the application ensures synchronous movement of the two chain wheels, eliminates the problem of synchronization, and reduces power loss.

Description

Technical Field

[0001] This application belongs to the field of railway bridge technology, and more specifically, relates to a tube pulling and cable threading system and a trolley. Background Technology

[0002] The prestressed tendon extraction and threading trolley for railway bridges integrates two core functions: tendon extraction and threading. This effectively improves construction efficiency, reduces labor intensity, and ensures the stability and reliability of construction quality. The electric flatbed trolley used by the trolley has lateral movement capabilities, allowing free movement forward, backward, left, and right within the beam yard for quick and easy access to the ends of the beams to be constructed. The tendon extraction and threading system uses two highly synchronized servo motors to drive clamps fixed on a double-row chain, tightly gripping the prestressed tendons, thus achieving uniform tendon extraction and threading. The clamps on the chain are semi-circular, with multiple pairs (5-7 pairs) clamping each other to prevent slippage during tendon extraction and threading, and to prevent the prestressed tendons from loosening, thereby ensuring construction quality. This drive method requires ensuring high synchronization between the two motors, which is challenging; moreover, the two-motor drive method results in significant energy loss. Utility Model Content

[0003] The purpose of this application is to provide a tube pulling and cable threading system and trolley to solve the technical problems of high difficulty in synchronizing the two motors and high energy consumption in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide a tube pulling and cable threading system, including a fixed beam, a movable beam, and two sprockets respectively mounted on the fixed beam and the movable beam, the two sprockets being arranged side by side with intervals; further comprising:

[0005] The driver is mounted on the fixed beam or the movable beam;

[0006] The first transmission rod is connected at one end to the driver and at the corresponding sprocket drive;

[0007] The main transmission mechanism is installed below the fixed beam and the movable beam; the main transmission mechanism is provided with a transmission component connected to the other end of the first transmission rod;

[0008] A secondary transmission mechanism is mounted on the main transmission mechanism and corresponds to another sprocket; the secondary transmission mechanism is drivingly connected to the main transmission mechanism and slidably connected to the main transmission mechanism; a transmission component is provided on the secondary transmission mechanism.

[0009] The second transmission rod is arranged parallel to and spaced apart from the first transmission rod, and one end is connected to the other sprocket; the other end of the second transmission rod is connected to the transmission component on the auxiliary transmission mechanism.

[0010] In one possible implementation, the main transmission mechanism includes a third transmission rod rotatably connected to the fixed beam and an outer transmission surface formed on the third transmission rod; the auxiliary transmission mechanism includes a transmission cylinder mounted on the third transmission rod, the transmission cylinder having an inner transmission surface that mates with the outer transmission surface, and the transmission cylinder being tractively connected to the third transmission rod.

[0011] In one possible implementation, there are multiple outer transmission surfaces, which are evenly spaced along the circumference of the third transmission rod; there are multiple inner transmission surfaces, which correspond one-to-one with the multiple outer transmission surfaces.

[0012] In one possible implementation, the transmission assembly includes two meshing bevel gears, with the two bevel gears on the main transmission mechanism respectively mounted on the third transmission rod and the first transmission rod, and the two bevel gears on the auxiliary transmission mechanism respectively mounted on the transmission cylinder and the second transmission rod.

[0013] In one possible implementation, the main transmission mechanism further includes two first bearing seats, and the two ends of the third transmission rod are respectively fitted onto the bearings in the two first bearing seats; the auxiliary transmission mechanism further includes two second bearing seats, and the two ends of the transmission cylinder are respectively fitted onto the bearings in the two second bearing seats.

[0014] In one possible implementation, the third transmission rod passes through the transmission cylinder, and both ends of the third transmission rod are located outside the sides opposite to the fixed beam and the moving beam, respectively.

[0015] In one possible implementation, the driver is fixedly mounted on the fixed beam, the first transmission rod is connected to the sprocket on the fixed beam, and the second transmission rod is connected to the sprocket on the movable beam.

[0016] In one possible implementation, the tube pulling and cable threading system further includes a support block installed below the fixed beam and the movable beam, with the lower sides of the first transmission rod and the second transmission rod rotatably connected to the support block.

[0017] In one possible implementation, the lower end of the support block has two mounting slots, and the two mounting slots correspond to the first transmission rod and the second transmission rod, respectively; the two transmission components are respectively installed in the two mounting slots.

[0018] The beneficial effects of the prestressed tendon pulling and threading system provided in this application are as follows: Compared with the prior art, in this application's prestressed tendon pulling and threading system, one of the actuators is installed on a fixed beam or a moving beam as a power source. One end of the first transmission rod is connected to the actuator and directly drives the corresponding sprocket to rotate. The other end transmits power to the auxiliary transmission mechanism through the transmission component of the main transmission mechanism. The second transmission rod, connected to the other sprocket, obtains power through the transmission component of the auxiliary transmission mechanism. At the same time, the auxiliary transmission mechanism can slide on the main transmission mechanism, which can flexibly adjust the distance between the two sprockets according to the specifications of the prestressed tendons to adapt to different construction needs. During operation, the actuator is then started, and the actuator drives one side of the sprocket to rotate through the first transmission rod. Simultaneously, power is transmitted to the second transmission rod via the main and auxiliary transmission mechanisms, driving the sprocket on the other side to rotate synchronously. The double-row chains then drive the clamps to grip the prestressed tendons and move at a uniform speed, realizing the tube pulling or tendon threading operation. After the operation is completed, the drive is turned off, and the system is moved to the next construction position by a trolley. In this way, a single drive with a multi-stage transmission mechanism replaces two motors, avoiding the problem of motor synchronization control, ensuring that the speed of the two sprockets is completely consistent, so that the clamping force of the clamps on the prestressed tendons is uniform and stable, further ensuring construction quality, eliminating slippage and prestressed tendon loosening problems. At the same time, the single drive mode significantly reduces power consumption, improves energy utilization efficiency, and reduces construction costs.

[0019] Another object of this application is to provide a tube removal and threading trolley, including any of the tube removal and threading systems described above.

[0020] This application provides a tube pulling and tendon threading trolley. Due to the adoption of a tube pulling and tendon threading system, a single drive combined with a multi-stage transmission mechanism replaces the dual motors, avoiding the problem of motor synchronization control, ensuring that the speed of the two sprockets is completely consistent, making the clamping force of the clamp on the prestressed tendon uniform and stable, further ensuring construction quality, eliminating slippage and prestressed tendon loosening problems, and at the same time, the single drive mode significantly reduces power consumption, improves energy utilization efficiency, and reduces construction costs. Attached Figure Description

[0021] Figure 1 A schematic diagram of the tube extraction and cable insertion system provided in the embodiments of this application. Figure 1 ;

[0022] Figure 2 This is a partial schematic diagram of the tube removal and cable threading system provided in the embodiments of this application;

[0023] Figure 3 A schematic diagram of the tube extraction and cable insertion system provided in the embodiments of this application. Figure 2 ;

[0024] Figure 4 This is a schematic diagram of the structure of the tube pulling and threading trolley provided in the embodiments of this application.

[0025] The following are the labeling elements in the figure:

[0026] 10. Fixed beam; 11. Moving beam; 12. Sprocket; 20. Driver; 30. First transmission rod; 40. Main transmission mechanism; 41. Third transmission rod; 42. Outer transmission surface; 43. First bearing seat; 50. Secondary transmission mechanism; 51. Transmission cylinder; 52. Second bearing seat; 60. Transmission assembly; 61. Bevel gear; 62. Support block; 63. Mounting groove; 70. Second transmission rod; 80. Flatcar body; 81. Electrical control system; 82. Lifting system; 83. Hydraulic system; 84. Foot support system; 85. Lateral and longitudinal movement system; 86. Tube pulling and cable threading system. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0028] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0029] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, 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.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0031] Please see Figures 1 to 4The tube removal and cable threading system 86 provided in this application will now be described. The tube removal and cable threading system 86 includes a fixed beam 10, a movable beam 11, and two sprockets 12 respectively mounted on the fixed beam 10 and the movable beam 11, the two sprockets 12 being arranged side-by-side with a gap; it also includes a driver 20, a first transmission rod 30, a main transmission mechanism 40, a secondary transmission mechanism 50, and a second transmission rod 70; the driver 20 is mounted on the fixed beam 10 or the movable beam 11; one end of the first transmission rod 30 is connected to the driver 20 and is drively connected to the corresponding sprocket 12; the main transmission mechanism 40 is mounted below the fixed beam 10 and the movable beam 11. The main transmission mechanism 40 is provided with a transmission assembly 60 connected to the other end of the first transmission rod 30; the auxiliary transmission mechanism 50 is mounted on the main transmission mechanism 40 and corresponds to another sprocket 12; the auxiliary transmission mechanism 50 is connected to the main transmission mechanism 40 in a transmission manner and is also slidably connected to the main transmission mechanism 40; the auxiliary transmission mechanism 50 is provided with a transmission assembly 60; the second transmission rod 70 is arranged parallel to and spaced apart from the first transmission rod 30, and one end is connected to another sprocket 12 in a transmission manner; the other end of the second transmission rod 70 is connected to the transmission assembly 60 on the auxiliary transmission mechanism 50.

[0032] The prestressed tendon pulling and threading system 86 provided in this application, compared with the prior art, has an actuator 20 selectively mounted on either the fixed beam 10 or the moving beam 11 as a power source. One end of the first transmission rod 30 is connected to the actuator 20 and directly drives the corresponding sprocket 12 to rotate, while the other end transmits power to the auxiliary transmission mechanism 50 through the transmission component 60 of the main transmission mechanism 40. The second transmission rod 70, connected to the other sprocket 12, obtains power through the transmission component 60 of the auxiliary transmission mechanism 50. At the same time, the auxiliary transmission mechanism 50 can slide on the main transmission mechanism 40, and can flexibly adjust the distance between the two sprockets 12 according to the prestressed tendon specifications to adapt to different construction needs. During operation, the actuator 20 is then started, and the actuator 20 drives one side of the sprocket 12 through the first transmission rod 30. The drive unit rotates, and simultaneously transmits power to the second drive rod 70 via the main drive mechanism 40 and the auxiliary drive mechanism 50, driving the sprocket 12 on the other side to rotate synchronously. The double-row chain then drives the clamp to grip the prestressed tendon and move at a uniform speed, realizing the pipe pulling or tendon threading operation. After the operation is completed, the drive unit 20 is turned off, and the system is moved to the next construction position by the trolley. In this way, the single drive unit 20 and the multi-stage transmission mechanism replace the dual motors, solving the problem of synchronous movement of the two sprockets 12. This ensures that the rotation speed of the two sprockets 12 is completely consistent, so that the clamping force of the clamp on the prestressed tendon is uniform and stable, further ensuring the construction quality and eliminating slippage and loosening of the prestressed tendon. At the same time, the single drive mode significantly reduces power consumption, improves energy utilization efficiency, and reduces construction costs.

[0033] The driver 20 is a regular motor or a servo motor, which is connected to the first transmission rod 30 through a reducer, coupling, etc., to drive the first transmission rod 30 to rotate.

[0034] Please see Figure 1 and Figure 2 As a specific embodiment of the tube pulling and tendon threading system 86 provided in this application, the main transmission mechanism 40 includes a third transmission rod 41 rotatably connected to the fixed beam 10 and an outer transmission surface 42 opened on the third transmission rod 41; the auxiliary transmission mechanism 50 includes a transmission cylinder 51 installed on the third transmission rod 41, the transmission cylinder 51 is provided with an inner transmission surface that is installed in conjunction with the outer transmission surface 42, and the transmission cylinder 51 is connected to the third transmission rod 41 in a transmission engagement; the third transmission rod 41 in the main transmission mechanism 40 is rotatably connected to the fixed beam 10, and its outer transmission surface 42 provides a stable carrier for power transmission, while the transmission cylinder 51 of the auxiliary transmission mechanism 50 is sleeved on the third transmission rod 41. Through the precise engagement of the inner transmission surface with the outer transmission surface 42 of the third transmission rod 41, reliable transmission between the two is achieved, and the transmission cylinder 51 is allowed to slide along the axial direction of the third transmission rod 41, thereby meeting the construction requirements of prestressed tendons of different specifications. The driver 20 drives the corresponding sprocket 12 to rotate via the first transmission rod 30, and simultaneously transmits power to the third transmission rod 41 via the transmission assembly 60. The third transmission rod 41, through its outer transmission surface 42 engaging with the inner transmission surface of the transmission cylinder 51, synchronously transmits power to the auxiliary transmission mechanism 50, which in turn drives the second transmission rod 70 to rotate synchronously with the other sprocket 12 via the transmission assembly 60. The structure of the third transmission rod 41 engaging with the inner and outer transmission surfaces 42 of the transmission cylinder 51 is simple and compact, with high transmission efficiency, ensuring synchronous power transmission. At the same time, the sliding design of the transmission cylinder 51 and the third transmission rod 41 facilitates operation and can flexibly adapt to prestressed tendons of different specifications, improving the versatility of the system.

[0035] Please see Figure 1 and Figure 2 As a specific embodiment of the tube pulling and threading system 86 provided in this application, there are multiple outer transmission surfaces 42, which are evenly spaced along the circumference of the third transmission rod 41; there are multiple inner transmission surfaces, which correspond one-to-one with the multiple outer transmission surfaces 42. This method allows for a tighter fit between the two and a more balanced power transmission, without affecting the axial sliding of the transmission cylinder 51 along the third transmission rod 41, and avoiding the problem of uneven force distribution that may occur with a single set of transmission surfaces. The multiple sets of inner transmission surfaces and outer transmission surfaces 42 always maintain precise correspondence, ensuring that the power transmission channel is uninterrupted. Subsequently, the driver 20 is started, and the power is transmitted to the third transmission rod 41 via the first transmission rod 30, and synchronously transmitted to the transmission cylinder 51 through the multiple sets of evenly distributed inner and outer transmission surfaces 42. The multiple sets of one-to-one corresponding transmission surfaces increase the contact area for power transmission, disperse the force, avoid the problem of excessive wear of a single transmission surface, and extend the service life of the machinery; the circumferentially evenly arranged structure ensures the symmetry and synchronicity of power transmission, further eliminating the slippage or loosening of prestressed tendons caused by inconsistent speeds of the sprocket 12, and ensuring construction quality.

[0036] Please see Figure 1 and Figure 2 As a specific embodiment of the tube pulling and cable threading system 86 provided in this application, the transmission assembly 60 includes two meshing bevel gears 61. The two bevel gears 61 on the main transmission mechanism 40 are respectively mounted on the third transmission rod 41 and the first transmission rod 30, and the two bevel gears 61 on the auxiliary transmission mechanism 50 are respectively mounted on the transmission cylinder 51 and the second transmission rod 70. The two bevel gears 61 on the main transmission mechanism 40 are respectively fixed to the ends of the third transmission rod 41 and the first transmission rod 30, and the two bevel gears 61 on the auxiliary transmission mechanism 50 are correspondingly mounted to the ends of the transmission cylinder 51 and the second transmission rod 70. By utilizing the characteristic that the meshing transmission of the bevel gears 61 can change the direction of power, a smooth power conversion between the first transmission rod 30, the second transmission rod 70 (vertical direction), and the third transmission rod 41 (horizontal direction) is realized, while ensuring accurate transmission ratio and providing reliable guarantee for the synchronous operation of the double sprockets 12. During operation, the bevel gear 61 remains engaged to ensure uninterrupted power transmission. After starting the driver 20, power is transmitted via the first transmission rod 30 to the bevel gear 61 in the main transmission mechanism 40. This meshing transmission drives the third transmission rod 41 to rotate, which in turn drives the transmission cylinder 51 to rotate synchronously. Power is then transmitted via the bevel gear 61 in the auxiliary transmission mechanism 50 to the second transmission rod 70, ensuring that the two sprockets 12 maintain highly synchronized speeds under a single drive source. This, in turn, drives the chain and clamps to grip the prestressed strand, completing the tube extraction or strand threading operation at a uniform speed. After the operation is completed, the driver 20 is turned off, and the system is moved to the next work station. The bevel gear 61 meshing transmission has a compact structure, high transmission efficiency, and a constant transmission ratio, ensuring that the two sprockets 12 rotate at the same speed.

[0037] Please see Figure 1 and Figure 2As a specific embodiment of the tube pulling and cable threading system 86 provided in this application, the main transmission mechanism 40 further includes two first bearing seats 43, and the two ends of the third transmission rod 41 are respectively fitted onto the bearings in the two first bearing seats 43; the auxiliary transmission mechanism 50 further includes two second bearing seats 52, and the two ends of the transmission cylinder 51 are respectively fitted onto the bearings in the two second bearing seats 52; by adding the fitting structure between the bearing seats and the bearings, the rotational smoothness and support stability of the main transmission mechanism 40 and the auxiliary transmission mechanism 50 are further optimized, and relying on the drag reduction characteristics of the bearings, the mechanical efficiency is reduced while ensuring efficient power transmission. Mechanical wear: The two first bearing seats 43 of the main transmission mechanism 40 are respectively installed at the preset positions of the fixed beam 10. The two ends of the third transmission rod 41 are precisely positioned and rotate flexibly by cooperating with the bearings in the first bearing seats 43, providing stable support for power transmission. The two second bearing seats 52 of the auxiliary transmission mechanism 50 are adapted to the transmission cylinder 51. The two ends of the transmission cylinder 51 are embedded in the bearings of the second bearing seats 52, which does not affect the axial sliding adjustment of the transmission cylinder 51 along the third transmission rod 41, and ensures the coaxiality and smoothness of the transmission cylinder 51 when rotating, perfectly connecting the transmission requirements of the multiple sets of transmission surfaces and the bevel gear 61 mentioned above.

[0038] Please see Figure 1 and Figure 2 In one specific embodiment of the tube pulling and prestressing tendon threading system 86 provided in this application, the third transmission rod 41 passes through the transmission cylinder 51, and both ends of the third transmission rod 41 are located outside the fixed beam 10 and the moving beam 11, respectively, on opposite sides. This layout does not affect the axial sliding of the transmission cylinder 51 along the third transmission rod 41, and provides more ample installation support space for the third transmission rod 41. At the same time, it avoids interference between the structures at both ends and the beam body, and is suitable for the assembly requirements of components such as bearing seats and bevel gears 61. The through-type layout of the third transmission rod 41 expands the sliding adjustment range of the transmission cylinder 51, can adapt to more specifications of prestressed tendons, and improves the versatility of the system.

[0039] Please see Figure 1 and Figure 3 In one specific embodiment of the tube pulling and cable threading system 86 provided in this application, the driver 20 is fixedly installed on the fixed beam 10. The first transmission rod 30 is connected to the sprocket 12 on the fixed beam 10, and the second transmission rod 70 is connected to the sprocket 12 on the moving beam 11. The driver 20 is fixedly installed on the fixed beam 10, and the first transmission rod 30 is directly connected to the sprocket 12 on the fixed beam 10, while the second transmission rod 70 is correspondingly connected to the sprocket 12 on the moving beam 11. The driver 20 installed on the fixed beam 10 is connected to the first transmission rod 30, so that the driver 20 is more stably installed and will not be displaced due to the movement of the moving beam 11; the power transmission path is simple and direct, reducing energy loss.

[0040] Please see Figures 1 to 3 As a specific embodiment of the tube pulling and threading system 86 provided in this application, the tube pulling and threading system 86 also includes a support block 62 installed below the fixed beam 10 and the moving beam 11. The lower sides of the first transmission rod 30 and the second transmission rod 70 are rotatably connected to the support block 62. By adding the support block 62 below the fixed beam 10 and the moving beam 11, and rotatably connecting the lower sides of the first transmission rod 30 and the second transmission rod 70 to the support block 62, the support stability of the transmission structure is further enhanced. The support block 62 provides additional precise support for the first transmission rod 30 and the second transmission rod 70, preventing deflection deformation of the transmission rods during high-speed rotation or long-term operation. The support block 62 provides reliable bottom support for the transmission rods, effectively suppressing vibration and deformation of the transmission rods, ensuring the stability of the transmission ratio, and further improving the synchronization accuracy of the two sprockets 12.

[0041] Please see Figures 1 to 3 As a specific embodiment of the tube pulling and cable threading system 86 provided in this application, the lower end of the support block 62 has two mounting slots 63, which correspond to the first transmission rod 30 and the second transmission rod 70, respectively. The two transmission components 60 are respectively installed in the two mounting slots 63, achieving integrated layout and precise positioning of the transmission structure. A closed plate can be arranged on the support block 62, and the mounting slots 63 provide a closed and stable mounting space for the transmission components 60, making the connection between the bevel gear 61 and the transmission rod more compact, while avoiding interference from external impurities. The design of the mounting slots 63 makes the transmission components 60 and the support block 62 form an integrated structure, improving overall rigidity, effectively suppressing vibration and offset during transmission, and ensuring the synchronization and precision of power transmission.

[0042] Please see Figure 4 This application embodiment also provides a tube removal and threading trolley, which includes any of the tube removal and threading systems 86 described above.

[0043] The tube pulling and cable threading trolley includes a flat car body 80 and an electrical control system 81, a lifting system 82, a hydraulic system 83, a foot support system 84, a horizontal and vertical movement system 85, and a tube pulling and cable threading system 86 installed on the flat car body 80.

[0044] The tube pulling and tendon threading trolley provided in this application adopts a tube pulling and tendon threading system 86, with a single drive 20 and a multi-stage transmission mechanism replacing dual motors. This avoids the problem of motor synchronization control and ensures that the two sprockets 12 rotate at completely consistent speeds. This makes the clamping force of the clamps on the prestressed tendons uniform and stable, further ensuring construction quality and eliminating slippage and prestressed tendon loosening problems. At the same time, the single drive mode significantly reduces power consumption, improves energy utilization efficiency, and reduces construction costs.

[0045] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A tube-pulling and cable-threading system, comprising a fixed beam, a movable beam, and two sprockets respectively mounted on the fixed beam and the movable beam, wherein the two sprockets are arranged side-by-side with a gap between them; characterized in that, Also includes: The driver is mounted on the fixed beam or the movable beam; The first transmission rod is connected at one end to the driver and at the corresponding sprocket drive; The main transmission mechanism is installed below the fixed beam and the movable beam; the main transmission mechanism is provided with a transmission component connected to the other end of the first transmission rod; A secondary transmission mechanism is mounted on the main transmission mechanism and corresponds to another sprocket; the secondary transmission mechanism is drivingly connected to the main transmission mechanism and slidably connected to the main transmission mechanism; a transmission component is provided on the secondary transmission mechanism. The second transmission rod is arranged parallel to and spaced apart from the first transmission rod, and one end is connected to the other sprocket; the other end of the second transmission rod is connected to the transmission component on the auxiliary transmission mechanism.

2. The tube-pulling and cable-threading system as described in claim 1, characterized in that, The main transmission mechanism includes a third transmission rod rotatably connected to the fixed beam and an outer transmission surface formed on the third transmission rod; the auxiliary transmission mechanism includes a transmission cylinder mounted on the third transmission rod, the transmission cylinder having an inner transmission surface that mates with the outer transmission surface, and the transmission cylinder being connected to the third transmission rod in a transmission engagement.

3. The tube-pulling and cable-threading system as described in claim 2, characterized in that, The number of external transmission surfaces is multiple, and they are evenly spaced along the circumference of the third transmission rod; the number of internal transmission surfaces is multiple, and they correspond one-to-one with the multiple external transmission surfaces.

4. The tube-pulling and cable-threading system as described in claim 2, characterized in that, The transmission assembly includes two meshing bevel gears. The two bevel gears on the main transmission mechanism are respectively mounted on the third transmission rod and the first transmission rod, and the two bevel gears on the auxiliary transmission mechanism are respectively mounted on the transmission cylinder and the second transmission rod.

5. The tube-pulling and cable-threading system as described in claim 2, characterized in that, The main transmission mechanism further includes two first bearing seats, and the two ends of the third transmission rod are respectively fitted onto the bearings in the two first bearing seats; the auxiliary transmission mechanism further includes two second bearing seats, and the two ends of the transmission cylinder are respectively fitted onto the bearings in the two second bearing seats.

6. The tube-pulling and cable-threading system as described in claim 5, characterized in that, The third transmission rod passes through the transmission cylinder, and both ends of the third transmission rod are located outside the sides opposite to the fixed beam and the moving beam, respectively.

7. The tube-pulling and cable-threading system as described in claim 1, characterized in that, The driver is fixedly mounted on the fixed beam, the first transmission rod is connected to the sprocket on the fixed beam, and the second transmission rod is connected to the sprocket on the movable beam.

8. The tube-pulling and cable-threading system as described in claim 1, characterized in that, The tube pulling and threading system also includes a support block installed below the fixed beam and the moving beam, and the lower sides of the first transmission rod and the second transmission rod are rotatably connected to the support block.

9. The tube-pulling and cable-threading system as described in claim 8, characterized in that, The lower end of the support block has two mounting slots, and the two mounting slots correspond to the first transmission rod and the second transmission rod, respectively; the two transmission components are respectively installed in the two mounting slots.

10. A tube-pulling and cable-threading trolley, characterized in that, Includes the tube-pulling and cable-pulling system as described in any one of claims 1-9.

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