Dragging traction mechanism and wrecker

Abstract

The utility model discloses a dragging traction mechanism and a wrecker, and relates to the technical field of wrecker clearance, the dragging traction mechanism comprises a frame, a first main shaft and a second main shaft, the frame is slidably connected with a traction part; according to the technical scheme, the driving part outputs power to drive the first main shaft to move, the second main shaft is driven to move through transmission of the first movable pulley block, the traction part is driven to move through transmission of the second movable pulley block, so that the traction part slides on the frame, and the output torque of the driving part is amplified through the two movable pulley blocks; and the stroke of the traction part is increased, the flat plate is connected to the traction part, and due to the increase of the stroke of the traction part, the included angle between the flat plate and the ground can be reduced, obstacle removing operation of a vehicle with a low chassis or a long wheelbase and a long front overhang is facilitated, the obstacle removing operation range is expanded, and the obstacle removing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of obstacle removal, in particular to a towing and traction mechanism and an obstacle removal vehicle. Background Art

[0002] The full name of the tow truck is road tow truck, also known as trailer, road rescue truck, towing truck, etc. It has many functions such as lifting, pulling and lifting and traction. The tow truck is mainly used for road breakdown vehicles, urban illegal vehicles and emergency rescue.

[0003] In the related art, the towing mechanism of the tow truck adopts a cylinder to cooperate with the towing flatbed for obstacle removal. However, due to the problem of the flatbed travel and other issues, the angle between the flatbed and the ground is too large, resulting in sports cars with low chassis or cars with long wheelbase and long front overhang being unable to get on the flatbed, making obstacle removal difficult and inefficient. Utility Model Content

[0004] The main purpose of the utility model is to provide a towing and traction mechanism and a tow truck, aiming to reduce the angle between the flat plate and the ground, so as to expand the range of vehicles suitable for tow trucks and improve the tow truck efficiency.

[0005] To achieve the above-mentioned purpose, the towing and traction mechanism proposed in the utility model comprises:

[0006] A frame, wherein a traction part is slidably connected to the frame;

[0007] A first main shaft, an end of which is connected to a driving unit, and the driving unit is mounted on the frame;

[0008] a second main shaft, the second main shaft being disposed between the first main shaft and the traction portion;

[0009] Wherein, the first main shaft and the second main shaft are connected via a first movable pulley set, and the second main shaft and the traction part are connected via a second movable pulley set.

[0010] In one embodiment, the frame includes a frame body and a crossbeam, the crossbeam is disposed on the frame body, and the traction portion is slidably disposed on the frame body;

[0011] The crossbeam includes a first crossbeam and a second crossbeam, the first crossbeam is close to the first main axis, and the second crossbeam is close to the second main axis.

[0012] In one embodiment, the first movable pulley group includes a first pulley portion and a second pulley portion, the first pulley portion and the second pulley portion are both disposed between the first main shaft and the second main shaft, and the first pulley portion and the second pulley portion are both connected to the first main shaft and the second main shaft.

[0013] In one embodiment, the first pulley portion includes a first pulley and a first transmission belt, the first pulley is rotatably connected to the first main shaft, one end of the first transmission belt is connected to the first beam, and the other end of the first transmission belt passes around the first pulley and is fixedly connected to the second main shaft.

[0014] In one embodiment, the second pulley portion includes a second pulley, a second transmission belt and a first support beam, one end of the first support beam is connected to the first main shaft, and the other end is rotatably connected to the second pulley, one end of the second transmission belt is connected to the first cross beam, and the other end of the second transmission belt passes around the second pulley and is fixedly connected to the second main shaft.

[0015] In one embodiment, the second movable pulley group includes a third pulley portion and a fourth pulley portion, the third pulley portion and the fourth pulley portion are both arranged between the second main shaft and the traction portion, and the third pulley portion and the fourth pulley portion are both connected to the second main shaft and the traction portion.

[0016] In one embodiment, the third pulley portion includes a third transmission belt, a second support beam and a third pulley, one end of the second support beam is connected to the second main shaft, and the other end is rotatably connected to the third pulley, one end of the third transmission belt is connected to the second cross beam, and the other end of the third transmission belt passes around the third pulley and is connected to the traction portion.

[0017] In one embodiment, the fourth pulley portion includes a fourth transmission belt and a fourth pulley, the fourth pulley is rotatably connected to the second main shaft, one end of the fourth transmission belt is fixedly connected to the second beam, and the other end of the fourth transmission belt passes around the fourth pulley and is connected to the traction portion.

[0018] In one embodiment, the driving unit is mounted on the crossbeam, and an output end of the driving unit is connected to the first main shaft.

[0019] The utility model also provides a tow truck, comprising the towing and traction mechanism.

[0020] The technical solution of the utility model drives the first main shaft to move through the output power of the driving part, drives the second main shaft to move through the transmission of the first movable pulley group, and drives the traction part to move through the transmission of the second movable pulley group, so as to realize the sliding of the traction part on the frame. Through the two movable pulley groups, the output torque of the driving part is amplified, and the stroke of the traction part is increased. A flat plate is connected to the traction part. Due to the increase in the stroke of the traction part, it is beneficial to reduce the angle between the flat plate and the ground, which is convenient for the clearance operation of vehicles with low chassis or long wheelbase and long front overhang, expands the clearance operation range, and improves the clearance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 A structural schematic diagram of an embodiment of a towing and traction mechanism provided by the utility model;

[0023] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0024] Figure 3 A structural schematic diagram of another embodiment of the towing and traction mechanism provided by the utility model;

[0025] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0026] Figure 5 A structural schematic diagram of another embodiment of the towing and traction mechanism provided by the utility model;

[0027] Figure 6 for Figure 5 A partial enlarged view of point C in the middle.

[0028] Description of Figure Numbers:

[0029] 1000, product; 10, frame; 11, crossbeam; 12, frame body; 20, traction unit; 30, drive unit; 40, first main shaft; 50, first movable pulley set; 51, first pulley unit; 511, first pulley; 512, first transmission belt; 52, second pulley unit; 521, second transmission belt; 522, first support beam; 523, second pulley; 60, second movable pulley set; 61, third pulley unit; 611, third transmission belt; 612, second support beam; 613, third pulley; 62, fourth pulley unit; 621, fourth pulley; 622, fourth transmission belt; 70, second main shaft.

[0030] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0034] The utility model provides a towing and traction mechanism.

[0035] See also Figure 1 to Figure 2 In one embodiment of the utility model, the towing and traction mechanism comprises:

[0036] A frame 10, on which a traction portion 20 is slidably connected;

[0037] A first main shaft 40, an end of which is connected to a driving unit 30, and the driving unit 30 is mounted on the frame 10;

[0038] A second main shaft 70, wherein the second main shaft 70 is disposed between the first main shaft 40 and the traction portion 20;

[0039] The first main shaft 40 and the second main shaft 70 are connected via a first movable pulley set 50 , and the second main shaft 70 and the traction part 20 are connected via a second movable pulley set 60 .

[0040] It should be noted that the traction part 20 is a lap platform, and a flat plate is installed on the lap platform. When the traction part 20 is driven to move, the flat plate is also driven to move, so that the flat plate can be tilted on the ground, making it convenient for the car to move to the flat plate.

[0041] The technical solution of the utility model drives the first main shaft 40 to move by outputting power through the driving part 30, drives the second main shaft 70 to move by transmission of the first movable pulley group 50, and drives the traction part 20 to move by transmission of the second movable pulley group 60, so as to realize the sliding of the traction part 20 on the frame 10. Through two movable pulley groups, the output torque of the driving part 30 is amplified, and the stroke of the traction part 20 is increased. A flat plate is connected to the traction part 20. Due to the increase in the stroke of the traction part 20, it is beneficial to reduce the angle between the flat plate and the ground, which is convenient for the obstacle removal operation of vehicles with low chassis or long wheelbase and long front overhang, expands the obstacle removal operation range, and improves the obstacle removal efficiency.

[0042] In one embodiment, the frame 10 includes a frame body 12 and a crossbeam 11, the crossbeam 11 is disposed on the frame body 12, and the traction portion 20 is slidably disposed on the frame body 12;

[0043] The crossbeam 11 includes a first crossbeam and a second crossbeam, the first crossbeam is close to the first main axis 40 , and the second crossbeam is close to the second main axis 70 .

[0044] like Figure 1 and Figure 2 As shown, the frame 12 is a frame-type structure, and a plurality of beams 11 are mounted on the frame 12 . The structural strength of the frame 12 is increased by the plurality of beams 11 .

[0045] like Figure 1 and Figure 2 As shown, the driving unit 30 is erected between the plurality of beams 11 , and the driving unit 30 is supported by the plurality of beams 11 . The driving unit 30 is stably supported by the plurality of beams 11 , thereby ensuring that the driving unit 30 can output power stably.

[0046] It can be understood that the driving part 30 is a cylinder, and the power output end of the driving part 30 is connected to the first main shaft 40 to facilitate controlling the movement of the first main shaft 40 relative to the frame 10.

[0047] It should be noted that there are multiple driving units 30 , and the output ends of the multiple driving units 30 are all connected to the first main shaft 40 to provide sufficient output power.

[0048] In one embodiment, if Figure 2 As shown, there are two driving parts 30, and the two driving parts 30 are spaced apart on the frame 10, and the output ends of the two driving parts 30 are respectively connected to the two ends of the first main shaft 40, so that the first main shaft 40 is stably supported by the two driving parts 30, and stable power output is facilitated.

[0049] like Figure 2 As shown, the first crossbeam is close to the first main shaft 40, the second crossbeam is close to the second main shaft 70, and the driving part 30 is disposed between the first crossbeam and the second crossbeam.

[0050] In one embodiment, the first movable pulley group 50 includes a first pulley portion 51 and a second pulley portion 52, the first pulley portion 51 and the second pulley portion 52 are both disposed between the first main shaft 40 and the second main shaft 70, and the first pulley portion 51 and the second pulley portion 52 are both connected to the first main shaft 40 and the second main shaft 70.

[0051] like Figure 2 As shown, the first pulley portion 51 and the second pulley portion 52 are disposed opposite to each other between the first main shaft 40 and the second main shaft 70 .

[0052] It can be understood that when the driving part 30 outputs power to drive the first main shaft 40 to translate to one side, the second main shaft 70 is driven to move through the transmission of the first pulley part 51, and at this time the second pulley part 52 moves as a slave; when the driving part 30 outputs power to drive the first main shaft 40 to translate to the opposite direction, the second main shaft 70 is driven to move through the second pulley part 52, and at this time the first pulley part 51 is reset by the driven motion.

[0053] It should be noted that both the first pulley portion 51 and the second pulley portion 52 are sliding pulleys, so as to increase the output torque to the second main shaft 70 and facilitate rapid response to the towing and traction operation.

[0054] In one embodiment, the first pulley portion 51 includes a first pulley 511 and a first transmission belt 512, the first pulley 511 is rotatably connected to the first main shaft 40, one end of the first transmission belt 512 is connected to the first crossbeam, and the other end of the first transmission belt 512 bypasses the first pulley 511 and is fixedly connected to the second main shaft 70.

[0055] like Figure 5 to Figure 6 As shown, the first pulley 511 is rotatably connected to the first main shaft 40 , and the first transmission belt 512 cooperates with the teeth on the first pulley 511 .

[0056] It can be understood that when the driving unit 30 outputs power to drive the first main shaft 40 to move, it simultaneously drives the first pulley 511 to move, thereby causing the first pulley 511 to rotate on the first pulley 511, thereby pulling the first transmission belt 512 and driving the second main shaft 70 to move in the direction of movement of the first main shaft 40.

[0057] It is understandable that when the second main shaft 70 is driven by the first transmission belt 512 to move in the direction of the first main shaft 40, the second main shaft 70 drives the second pulley portion 52 to move, so as to facilitate the subsequent driving of the second main shaft 70 to reset.

[0058] like Figure 5 to Figure 6 As shown, the first pulley 511 is a sprocket, and the first transmission belt 512 is a chain. The chain is connected to the sprocket to prevent the first pulley 511 from slipping with the first transmission belt 512 during rotation, thereby improving transmission efficiency.

[0059] In one embodiment, the first pulley 511 is a pulley, and the first transmission belt 512 is a belt.

[0060] In one embodiment, the second pulley portion 52 includes a second pulley 523, a second transmission belt 521 and a first support beam 522, one end of the first support beam 522 is connected to the first main shaft 40, and the other end is rotatably connected to the second pulley 523, one end of the second transmission belt 521 is connected to the first cross beam, and the other end of the second transmission belt 521 passes around the second pulley 523 and is fixedly connected to the second main shaft 70.

[0061] like Figure 1 and Figure 2 As shown, the second pulley 523 is close to the second main shaft 70. In order to facilitate supporting the second pulley 523, the first support beam 522 is connected to the first main shaft 40, and one end of the first support beam 522 is rotatably connected to the second pulley 523, and one end of the second main shaft 70 is overlapped on the first support beam 522, one end of the second transmission belt 521 is fixed to the first cross beam, and the other end of the second transmission belt 521 extends along the bottom surface of the first support beam 522 in the direction of the second pulley 523, and bypasses the second pulley 523 to be connected to the second main shaft 70.

[0062] It can be understood that when the driving unit 30 drives the first main shaft 40 to move in the direction of the second crossbeam, the first main shaft 40 actively drives the first crossbeam 522 to move, thereby causing the second pulley 523 to move on the second transmission belt 523, thereby pulling the second main shaft 70 to move in the direction of the second crossbeam.

[0063] It can be understood that when the second main shaft 70 is driven to move by the second transmission belt 523 , the first transmission belt 512 is driven to move, thereby driving the first pulley 511 to rotate and resetting the first transmission belt 512 .

[0064] It should be noted that there are multiple first movable pulley groups 50, and the multiple first movable pulley groups 50 are arranged at intervals between the first main shaft 40 and the second main shaft 70, so that the first main shaft 40 can smoothly pull the second main shaft 70 to translate through the multiple first movable pulley groups 50.

[0065] In one embodiment, the number of the first movable pulley sets 50 is two, and the two first movable pulley sets 50 are respectively disposed at the ends of the second main shaft 70 , and the two first movable pulley sets 50 are mirror-imaged.

[0066] like Figure 1 and Figure 2 As shown, the second pulley 523 is a sprocket, and the second transmission belt 523 is a chain. The chain is connected to the sprocket to prevent the second pulley 523 from slipping with the second transmission belt 523 during rotation, thereby improving transmission efficiency.

[0067] In one embodiment, the second pulley 523 is a pulley, and the second transmission belt 523 is a belt.

[0068] In one embodiment, the second movable pulley set 60 includes a third pulley portion 61 and a fourth pulley portion 62, and the third pulley portion 61 and the fourth pulley portion 62 are both arranged between the second main shaft 70 and the traction portion 20, and the third pulley portion 61 and the fourth pulley portion 62 are both connected to the second main shaft 70 and the traction portion 20.

[0069] like Figure 1 , Figure 3 and Figure 4 As shown, the third pulley portion 61 and the fourth pulley portion 62 are disposed opposite to each other between the second main shaft 70 and the traction portion 20 .

[0070] It can be understood that when the second main shaft 70 is driven to move in the direction of the first cross beam, the second main shaft 70 drives the fourth pulley portion 62 to move, thereby pulling the traction portion 20 to move, and the third pulley portion 61 is driven to move by the traction portion 20; when the second main shaft 70 is driven to move in the direction of the second cross beam, the second main shaft 70 drives the third pulley portion 61 to move, thereby driving the traction portion 20 to move in the direction away from the second cross beam, and the fourth pulley portion 61 moves follower.

[0071] It should be noted that the first movable pulley group 50 and the second movable pulley group 60 transmit the power of the driving group 30, thereby driving the traction part 20 to move. The two movable pulley groups extend the stroke of the traction part 20 and amplify the torque on the traction part 20, thereby increasing the force when towing the vehicle, making it easier to pull large-mass vehicles and improving traction efficiency.

[0072] In one embodiment, the third pulley portion 61 includes a third transmission belt 611, a second support beam 612 and a third pulley 613, one end of the second support beam 612 is connected to the second main shaft 70, and the other end is rotatably connected to the third pulley 613, one end of the third transmission belt 611 is connected to the second cross beam, and the other end of the third transmission belt 611 passes around the third pulley 613 and is connected to the traction portion 20.

[0073] like Figure 3 and Figure 4 As shown, the second support beam 612 is installed on the second main shaft 70, and the second cross beam faces the traction part 20, and the end of the second support beam 612 away from the second main shaft 70 is rotatably connected to the third pulley 613, one end of the third transmission belt 611 is connected to the second cross beam, and the other end of the third transmission belt 611 extends along the side of the second support beam 612, bypasses the third pulley 613 and is connected to the traction part 20.

[0074] It can be understood that when the second main shaft 70 moves toward the direction of the traction part 20, the second main shaft 70 drives the second support beam 612 to move, thereby driving the third pulley 613 to rotate on the third transmission belt 611, and then the third transmission belt 611 drives the traction part 20 to move.

[0075] It can be understood that when the first main shaft 40 drives the second main shaft 70 to move in a direction away from the first main shaft 40 through the second pulley portion 52, the traction portion 20 moves synchronously, and as the second main shaft 70 moves, the traction portion 20 moves in a direction away from the second main shaft 70 under the transmission of the third pulley portion 61, so that when the driving portion 30 outputs power, the stroke of the traction portion 20 is extended through the two movable pulley groups, and the driving torque is increased.

[0076] like Figure 3 and Figure 4As shown, the third pulley 613 is a sprocket, and the third transmission belt 611 is a chain. The chain is connected to the sprocket to prevent the third pulley 613 from slipping with the third transmission belt 611 during rotation, thereby improving transmission efficiency.

[0077] In one embodiment, the third pulley 613 is a belt pulley, and the third transmission belt 611 is a belt.

[0078] In one embodiment, the fourth pulley portion 62 includes a fourth transmission belt 622 and a fourth pulley 621, the fourth pulley 621 is rotatably connected to the second main shaft 70, one end of the fourth transmission belt 622 is fixedly connected to the second cross beam, and the other end of the fourth transmission belt 622 passes around the fourth pulley 621 and is connected to the traction portion 20.

[0079] like Figure 1 and Figure 2 As shown, the fourth pulley 621 is rotatably connected to the second main shaft 70, one end of the fourth transmission belt 622 is fixed to the second cross beam, and the other end of the fourth transmission belt 622 bypasses the fourth pulley 621 and extends toward the traction part 20 and is connected to the traction part 20.

[0080] It can be understood that when the second main shaft 70 moves toward the first main shaft 40, the fourth pulley 621 and the fourth transmission belt 622 are driven to move, thereby pulling the traction part 20 to move, and the third pulley part 61 is driven to move.

[0081] It should be noted that there are multiple second movable pulley sets 60 , which are arranged at intervals, and the third pulley 61 and the fourth pulley portion 62 are arranged at intervals between the second main shaft 70 and the traction portion 20 .

[0082] In one embodiment, the number of the second movable pulley sets 60 is two, and the two second movable pulley sets 60 are mirror-imaged.

[0083] In one embodiment, the driving unit 30 is mounted on the beam 11 , and an output end of the driving unit 30 is connected to the first main shaft 40 .

[0084] like Figure 1 and Figure 2 As shown, the fourth pulley 621 is a sprocket, and the fourth transmission belt 622 is a chain. The chain is connected to the sprocket to prevent the fourth pulley 621 from slipping with the fourth transmission belt 622 during rotation, thereby improving transmission efficiency.

[0085] In one embodiment, the fourth pulley 621 is a pulley, and the fourth transmission belt 622 is a belt.

[0086] The utility model also proposes a tow truck, which includes the towing and traction mechanism 1000. The specific structure of the towing and traction mechanism 1000 refers to the above-mentioned embodiment. Since the tow truck adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0087] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A towing and traction mechanism, characterized in that: include: A frame, wherein a traction part is slidably connected to the frame; A first main shaft, an end of which is connected to a driving unit, and the driving unit is mounted on the frame; a second main shaft, the second main shaft being disposed between the first main shaft and the traction portion; Wherein, the first main shaft and the second main shaft are connected via a first movable pulley set, and the second main shaft and the traction part are connected via a second movable pulley set.

2. The towing and traction mechanism according to claim 1, characterized in that: The frame comprises a frame body and a crossbeam, the crossbeam is arranged on the frame body, and the traction part is slidably arranged on the frame body; The crossbeam includes a first crossbeam and a second crossbeam, the first crossbeam is close to the first main axis, and the second crossbeam is close to the second main axis.

3. The towing and traction mechanism according to claim 2, characterized in that: The first movable pulley group includes a first pulley portion and a second pulley portion, the first pulley portion and the second pulley portion are both arranged between the first main shaft and the second main shaft, and the first pulley portion and the second pulley portion are both connected to the first main shaft and the second main shaft.

4. The towing and traction mechanism according to claim 3, characterized in that: The first pulley portion includes a first pulley and a first transmission belt, the first pulley is rotatably connected to the first main shaft, one end of the first transmission belt is connected to the first beam, and the other end of the first transmission belt passes around the first pulley and is fixedly connected to the second main shaft.

5. The towing and traction mechanism according to claim 3, characterized in that: The second pulley portion includes a second pulley, a second transmission belt and a first support beam, one end of the first support beam is connected to the first main shaft, and the other end is rotatably connected to the second pulley, one end of the second transmission belt is connected to the first cross beam, and the other end of the second transmission belt passes around the second pulley and is fixedly connected to the second main shaft.

6. The towing and traction mechanism according to claim 2, characterized in that: The second movable pulley group includes a third pulley portion and a fourth pulley portion, the third pulley portion and the fourth pulley portion are both arranged between the second main shaft and the traction portion, and the third pulley portion and the fourth pulley portion are both connected to the second main shaft and the traction portion.

7. The towing and traction mechanism according to claim 6, characterized in that: The third pulley portion includes a third transmission belt, a second support beam and a third pulley, one end of the second support beam is connected to the second main shaft, and the other end is rotatably connected to the third pulley, one end of the third transmission belt is connected to the second cross beam, and the other end of the third transmission belt passes around the third pulley and is connected to the traction portion.

8. The towing and traction mechanism according to claim 6, characterized in that: The fourth pulley portion includes a fourth transmission belt and a fourth pulley. The fourth pulley is rotatably connected to the second main shaft. One end of the fourth transmission belt is fixedly connected to the second beam. The other end of the fourth transmission belt passes around the fourth pulley and is connected to the traction portion.

9. The towing and traction mechanism according to claim 2, characterized in that: The driving part is mounted on the crossbeam, and an output end of the driving part is connected to the first main shaft.

10. A tow truck, characterized in that: It comprises a towing and traction mechanism as claimed in any one of claims 1 to 9.

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