Tractor and roll welding equipment

Abstract

The utility model relates to a tractor and roll welding equipment, the tractor comprises a traction device, a quick return device and a control module, the traction device comprises a first driving assembly and a first driving wheel connected to the first driving assembly, and the first driving assembly has a first transmission ratio; the quick-return device comprises a second driving assembly and a second driving wheel connected to the second driving assembly, the second driving assembly has a second transmission ratio, and the control module is used for controlling the first driving assembly to drive the first driving wheel to rotate at the first transmission ratio so that the tractor can move at the first speed to be in a traction state. Or the second driving assembly is controlled to drive the second driving wheel to rotate at a second transmission ratio, so that the tractor can move at a second speed larger than the first speed to be in the fast return state. Therefore, the tractor can move at different speeds in a traction state and a quick return state, energy consumption waste and time waste are avoided, and production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of pipe pile product production, and in particular to a tractor and roll welding equipment. Background Art

[0002] The steel cage rolling welding equipment is a machine that winds spiral reinforcements around multiple main reinforcements (also called main reinforcements or steel bars) arranged along the axis and welds them, ending the history of manual tying of reinforcement cages. As an important production equipment in the production process of prestressed pipe piles, the steel cage rolling welding equipment can automatically connect multiple main reinforcements into a rigid frame (i.e., cage reinforcement), which can be further poured with concrete to form concrete piles, and is widely used in the construction field.

[0003] Specifically, the seam welding equipment is mainly composed of five parts: the overall head, tail, automatic reinforcing bar threading machine, material buffer, and electrical system. The tail part is composed of a frame, a tractor, a steel cage bracket, etc. The tractor is generally driven by a variable frequency motor + chain drive. This driving method drives the motor with the same large torque when traction of the cage and when returning after completing the traction task. As a result, the tractor can only return at a low speed after completing the traction task, which not only wastes energy, but also wastes time and reduces production efficiency. Utility Model Content

[0004] Based on this, the purpose of the present application is to provide a tractor and a rolling welding device including the tractor, so as to solve the problem that the motor of the existing tractor is driven with the same large torque when towing and returning after completing the traction task, resulting in waste of energy and time.

[0005] According to one aspect of the present application, there is provided a tractor, comprising:

[0006] Support components;

[0007] A traction device and a quick return device are both mounted on the support assembly, the traction device comprises a first drive assembly and a first drive wheel connected to the first drive assembly, the first drive assembly has a first transmission ratio; the quick return device comprises a second drive assembly and a second drive wheel connected to the second drive assembly, the second drive assembly has a second transmission ratio;

[0008] A control module is communicatively connected to the first drive assembly and the second drive assembly, and the control module is used to control the first drive assembly to drive the first drive wheel to rotate around its own central axis at the first transmission ratio so that the tractor can move at a first speed and be in a traction state, or control the second drive assembly to drive the second drive wheel to rotate around its own central axis at the second transmission ratio so that the tractor can move at a second speed greater than the first speed and be in a fast return state.

[0009] In one embodiment, the first drive assembly includes a first drive member and a first reducer, the first reducer has a first transmission shaft and a second transmission shaft that are transmission-connected to each other, the first drive member is connected to the first transmission shaft, the first drive wheel is connected to the second transmission shaft, and the first transmission ratio is formed between the second transmission shaft and the first transmission shaft;

[0010] One end of the second transmission shaft is also sleeved with a clutch mechanism that is transmission-connected to the first drive wheel. The clutch mechanism can engage with the second transmission shaft when the tractor is in the traction state, or release the second transmission shaft when the tractor is in the quick return state.

[0011] In one embodiment, central axes of the first transmission shaft and the second transmission shaft are perpendicular to each other.

[0012] In one embodiment, the traction device also includes a third transmission shaft and a transmission assembly, one end of the transmission assembly is connected to the clutch mechanism, and the other end is connected to one end of the third transmission shaft in its own axial direction, and the third transmission shaft is connected to the first drive wheel at one end of its own axial direction away from the transmission assembly, and the central axes of the third transmission shaft and the second transmission shaft are parallel to each other.

[0013] In one embodiment, the transmission assembly includes a first transmission wheel and a second transmission wheel that are transmission-connected to each other and whose central axes are parallel to each other. The first transmission wheel is fixedly sleeved on the clutch mechanism, and the second transmission wheel is fixedly sleeved on the third transmission shaft.

[0014] In one embodiment, the first transmission wheel and the second transmission wheel are gears, which are meshed with each other and have the same diameter.

[0015] In one embodiment, the first transmission shaft and the second transmission shaft are parallel to each other, and the first driving member and the clutch mechanism are located at the same end of the traction device.

[0016] In one embodiment, the second drive assembly includes a second drive member and a second reducer, the second drive member is connected to the input end of the second reducer, the second drive wheel is connected to the output end of the second reducer, and the second transmission ratio is formed between the output end of the second reducer and the input end of the second reducer.

[0017] In one embodiment, the support assembly includes a frame and a chassis installed at the bottom of the frame, the first drive assembly and the second drive assembly are installed in the frame, the first drive wheel and the second drive wheel are protruding relative to the bottom side of the chassis, and a guide block is installed on the bottom side of the chassis. The guide block is used to slide and connect with an external guide rail when the tractor moves to guide the tractor.

[0018] According to another aspect of the present application, a rolling welding device is provided, comprising a tractor as described in any of the above schemes.

[0019] The above-mentioned tractor is provided with a traction device and a quick return device with different transmission ratios in the support component, and a control module is provided to communicate with the first drive component of the traction device and the second drive component of the quick return device, so that when the control module controls the first drive component to drive the first drive wheel of the traction device to rotate with the first transmission ratio, the tractor can move at a first speed and be in a traction state. In this state, the first drive component can be pulled with a large torque, so that the tractor has sufficient traction to drive the material to move forward smoothly along a straight line; when the control module controls the second drive component to drive the second drive wheel to rotate with the second transmission ratio, the tractor can move at a second speed greater than the first speed and be in a quick return state. In this state, the tractor can quickly return to the origin to prepare for the next traction. In this way, in the traction state and the quick return state, the tractor can move at different speeds, and can be stably pulled by the first drive component with a large torque during traction, and can avoid the second drive component dragging the first drive component with a large torque to move during quick return, thereby avoiding energy waste and time waste and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 An axle-side view of a tractor provided in accordance with an embodiment of the present application.

[0021] Figure 2 A front view of a tractor provided according to an embodiment of the present application.

[0022] Figure 3 for Figure 2 Sectional view along AA direction.

[0023] Figure 4A front view of a traction device provided in one embodiment of the present application.

[0024] Figure 5 This is an axial side view of a quick return device provided in one embodiment of the present application.

[0025] Figure 6 A partial cross-sectional view of a traction device provided in another embodiment of the present application.

[0026] Figure 7 An axonometric view of a traction device provided in another embodiment of the present application.

[0027] Figure 8 This is an axonometric view of a traction device provided in one embodiment of the present application.

[0028] Fig. 9 for Figure 4 Cross-sectional view along the BB axis.

[0029] Description of reference numerals:

[0030] 10. Tractor; 100. Support assembly; 110. Frame; 120. Chassis; 200. Traction device; 210. First drive assembly; 211. First drive member; 212. First reducer; 2121. Second transmission shaft; 220. First drive wheel; 230. Clutch mechanism; 240. Third transmission shaft; 250. Transmission assembly; 251. First drive wheel; 252. Second drive wheel; 300. Quick return device; 310. Second drive assembly; 311. Second drive member; 312. Second reducer; 320. Second drive wheel; 400. Guide block; 500. Position detection system; 600. Buffer. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0037] The present application provides a tractor and a roll welding device, wherein the roll welding device includes a roll welding machine and a tractor, the roll welding machine is used to weld spiral spiral reinforcements to multiple main reinforcements to form a rigid frame as a whole (i.e., cage reinforcement), and the tractor is used to pull the main reinforcement to move when the roll welding machine is welding, so that the spiral reinforcement can be spirally wound around the main reinforcement.

[0038] The following uses the tractor applied to the seam welding equipment as an example to explain the structure of the tractor in the present application. It is understandable that in other embodiments, the tractor in the present application is not limited to being applied to the seam welding equipment, but can also be used in any occasion where traction is required, which is not limited here.

[0039] Figures 1 to 3 The tractor 10 provided by an embodiment of the present application is shown. The tractor 10 provided by the embodiment of the present application comprises a support assembly 100, a traction device 200, a quick return device 300 and a control module (not shown in the figure), wherein the traction device 200 and the quick return device 300 are both installed on the support assembly 100, and the control module is communicatively connected to the traction device 200 and the quick return device 300. The support assembly 100 is used to install the traction device 200 and the quick return device 300, and plays a supporting role for the tractor 10 as a whole; the traction device 200 is used to provide traction when the tractor 10 is traction of materials (such as cage reinforcement), so that the tractor 10 can move forward smoothly along a straight line and be in a traction state; the quick return device 300 is used to make the tractor 10 quickly return to the origin after the tractor 10 unloads the materials and is in a quick return state to prepare for the next traction; the control module is used to control the traction device 200 and the quick return device 300 respectively, so that the tractor 10 can switch between the traction state and the quick return state during traction or after completing the traction task.

[0040] Specifically, Figure 2 and Figure 3As shown, the support assembly 100 includes a frame 110 and a chassis 120. The frame 110 is formed by splicing a plurality of profiles and plates into a frame shape, and the chassis 120 is installed at the bottom of the frame 110. The traction device 200 includes a first drive assembly 210 and a first drive wheel 220 connected to the first drive assembly 210. The quick return device 300 includes a second drive assembly 310 and a second drive wheel 320 connected to the second drive assembly 310. The first drive assembly 210 and the second drive assembly 310 are both installed in the frame 110. The first drive wheel 220 and the second drive wheel 320 are protruding relative to the bottom side of the chassis 120, so that the first drive wheel 220 and the second drive wheel 320 can respectively roll on the ground or be rollingly connected with an external slide rail or rack, so that the tractor 10 can move in a straight direction.

[0041] exist Figure 2 In the embodiment shown in , the first driving wheel 220 and the second driving wheel 320 are both gears, and both are used to engage with the rack on the ground, so that the first driving wheel 220 and the second driving wheel 320 are rollingly connected to the rack, thereby having the advantages of stable speed and strong anti-interference ability.

[0042] Further, in the embodiment provided by the present application, the first drive assembly 210 has a first transmission ratio, the second drive assembly 310 has a second transmission ratio, and the control module is communicatively connected to the first drive assembly 210 and the second drive assembly 310, and can control the first drive assembly 210 to drive the first drive wheel 220 to rotate around its own central axis at the first transmission ratio, or control the second drive assembly 310 to drive the second drive wheel 320 to rotate around its own central axis at the second transmission ratio. When the control module controls the first drive assembly 210 to drive the first drive wheel 220 to rotate at the first transmission ratio, the tractor 10 can move at the first speed and be in the above-mentioned traction state; when the control module controls the second drive assembly 310 to drive the second drive wheel 320 to rotate at the second transmission ratio, the tractor 10 can move at a second speed greater than the first speed and be in the fast return state.

[0043] Specifically, Figure 4 and Figure 5As shown, the first driving assembly 210 of the traction device 200 includes a first driving member 211 and a first reducer 212, the input end of the first reducer 212 is connected to the first driving member 211, and the output end is connected to the first driving wheel 220, the output end of the first reducer 212 and the input end of the second reducer 312 form a first transmission ratio, and the first driving member 211 reduces the speed of its output through the first reducer 212; similarly, the second driving assembly 310 of the quick return device 300 includes a second driving member 311 and a second reducer 312, the input end of the second reducer 312 is connected to the second driving member 311, and the output end is connected to the second driving wheel 320, and the second driving member 311 reduces the speed of its output through the second reducer 312. The difference is that the first transmission ratio is different from the second transmission ratio, so that the first driving member 211 can drive the first driving wheel 220 to rotate with a larger torque so that the tractor 10 has a larger traction force to pull the material, and the second driving member 311 can drive the second driving wheel 320 to rotate with a smaller torque so that the tractor 10 can quickly return to the origin after completing the traction task.

[0044] For example, between the output end and the input end of the first reducer 212, the first transmission ratio is 3:1, and between the output end and the input end of the second reducer 312, the second transmission ratio is 2:1. In this way, the first transmission ratio is greater than the second transmission ratio, so that when the first driving member 211 drives the first driving wheel 220 to rotate at the first transmission ratio, the tractor 10 can move at a slower first speed to complete the traction task, and when the second driving member 311 drives the second driving wheel 320 to rotate at the second transmission ratio, the tractor 10 can quickly return to the origin at a faster second speed after completing the traction task, thereby avoiding energy consumption and time waste and improving production efficiency.

[0045] It can be understood that the first driving member 211 and the second driving member 311 can both be common motors or servo motors, etc., and there is no special limitation here.

[0046] Figures 6 to 9 The structures of the traction device 200 of two embodiments are shown. In the structures of the two embodiments, the first reducer 212 of the traction device 200 has a first transmission shaft (not shown in the figure) and a second transmission shaft 2121 that are mutually transmission-connected. The first transmission shaft forms the input end of the first reducer 212, the second transmission shaft 2121 forms the output end of the first reducer 212, the first driving member 211 is connected to the first transmission shaft, the first driving wheel 220 is connected to the second transmission shaft 2121, and a first transmission ratio is formed between the second transmission shaft 2121 and the first transmission shaft.

[0047] Furthermore, in the structures of the above two embodiments, one end of the second transmission shaft 2121 of the second reducer 312 is sleeved with a clutch mechanism 230 that is transmission-connected to the first drive wheel 220. Optionally, the clutch mechanism 230 is an overrunning clutch, which is a clutch that transmits motion or torque in one direction by meshing of teeth, or meshing of ratchet and pawl, or wedging of rollers and wedges. Therefore, when the tractor 10 is in a traction state, the clutch mechanism 230 can be engaged with the second transmission shaft 2121, and at the same time, the control module controls the first drive member 211 to be energized and the second drive member 311 to be de-energized. At this time, the first drive member 211 can drive the clutch mechanism 230 with a larger torque through the first reducer 212 to drive the first drive wheel 220 to move on the rack or the slide rail, and the second drive wheel 320, as a driven wheel, rolls at the same speed with the first drive wheel 220 to achieve traction; conversely, when the tractor 10 is in a fast return state, The clutch mechanism 230 can release the second transmission shaft 2121, and at the same time, the control module controls the second driving member 311 to be energized, and the first driving member 211 is de-energized. At this time, the second driving member 311 can drive the second driving wheel 320 to move on the rack or the slide rail with a smaller torque through the second reducer 312. Since the first driving wheel 220 is not connected to the first driving member 211 at this time, the first driving wheel 220, as a driven wheel, can roll quickly at the same speed as the second driving wheel 320, so that the tractor 10 can quickly return to the origin.

[0048] The differences in the structures of the traction device 200 in the two embodiments are further described below. Figure 6 and Figure 7 In the first embodiment shown, the first reducer 212 has two bevel gears (not shown in the figure) whose central axes are perpendicular to each other and mesh with each other, the first transmission shaft is connected to one bevel gear, and the second transmission shaft 2121 is connected to the other bevel gear, so that the central axis of the first transmission shaft is perpendicular to the central axis of the second transmission shaft 2121. The clutch mechanism 230 is sleeved on the end of the second transmission shaft 2121 away from the first transmission shaft, and can selectively engage or release the second transmission shaft 2121, and the first driving wheel 220 is coaxially connected to the clutch mechanism 230. It can be seen that the traction device 200 of this embodiment has fewer parts and components, and has the advantages of simple structure and low cost.

[0049] exist Figures 8 to 9 In the second embodiment shown, the traction device 200 also includes a third transmission shaft 240 and a transmission assembly 250, one end of the transmission assembly 250 is connected to the clutch mechanism 230, and the other end is connected to one end of the third transmission shaft 240 in its own axial direction, and the third transmission shaft 240 is connected to the first drive wheel 220 at one end of its own axial direction away from the transmission assembly 250, and the central axes of the third transmission shaft 240 and the second transmission shaft 2121 are parallel to each other.

[0050] Specifically, in one embodiment, the transmission assembly 250 includes a first transmission wheel 251 and a second transmission wheel 252 that are connected to each other, the first transmission wheel 251 is fixedly sleeved on the clutch mechanism 230, and the second transmission wheel 252 is fixedly sleeved on the third transmission shaft 240. Optionally, both the first transmission wheel 251 and the second transmission wheel 252 are gears. The two are meshed with each other and have the same diameter.

[0051] In order to further make the structure of the traction device 200 compact, the gears in the first reducer 212 (not shown in the figure) are all spur gears, and the central axes of the meshing gears are parallel to each other, so that the first transmission shaft and the second transmission shaft 2121 are parallel to each other, and the first driving member 211 and the clutch mechanism 230 are located at the same end of the traction device 200.

[0052] In this way, when the first driving member 211 is started, the first driving member 211 drives the first transmission shaft to rotate, and the first transmission shaft drives the second transmission shaft 2121 to rotate at a lower rotation speed than the first transmission shaft through the first transmission ratio. When the clutch mechanism 230 is engaged with the second transmission shaft 2121, the second transmission shaft 2121 drives the clutch mechanism 230, the first transmission wheel 251 and the second transmission wheel 252 to rotate synchronously, and the second transmission wheel 252 drives the third transmission shaft 240 and the first driving wheel 220 to rotate synchronously, so that the first driving member 211 can drive the first driving wheel 220 to rotate with a larger torque; when the clutch mechanism 230 releases the second transmission shaft 2121, when the first driving wheel 220 rotates as a driven wheel, it can only drive the third transmission shaft 240, the second transmission wheel 252, the first transmission wheel 251 and the clutch mechanism 230 to rotate together, thereby achieving isolation from the first driving member 211, thereby saving energy consumption and reducing operating resistance.

[0053] It can be seen that in the structure of the second embodiment, the distance between the first driving wheel 220 and the shoulder of the third transmission shaft 240 is relatively short, so when the first driving wheel 220 rolls on the rack or the slide rail, it has a relatively small output torque, which can effectively protect the third transmission shaft 240 and avoid damage to the third transmission shaft 240 due to excessive output torque. In addition, the traction device 200 of the above two embodiments is gear-driven inside, so that the tractor 10 moves at a more stable speed. For example, when the roll welding equipment is used to pull the cage reinforcement, the roll welding machine performs roll welding. Because of the stable speed, the spacing of the spiral reinforcement wound around the main reinforcement can be avoided from being large or small, ensuring that the cage reinforcement obtained by welding has better quality.

[0054] In a preferred embodiment, in order to make the tractor 10 move linearly in only one direction when towing or returning to the origin, refer to Figure 1 and Figure 2A guide block 400 is also installed on the bottom side of the chassis 120. The guide block 400 is used to be slidably connected to the external guide rail when the tractor 10 moves to guide the tractor 10.

[0055] In addition, in some other preferred embodiments, such as Figure 2 and Figure 3 As shown, a position detection system 500 is also installed in the tractor 10, which can monitor the position of the tractor 10 in real time and transmit the position information of the tractor 10 back to the control module; optionally, a buffer 600 is also installed at the end of the frame 110 to prevent the tractor 10 from colliding at the two extreme positions of the origin and the end point, thereby playing a protective role. The structures of the position detection system 500 and the buffer 600 are both existing technologies and will not be described in detail here.

[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A tractor, characterized in that: include: Support components; A traction device and a quick return device are both mounted on the support assembly, the traction device comprises a first drive assembly and a first drive wheel connected to the first drive assembly, the first drive assembly has a first transmission ratio; the quick return device comprises a second drive assembly and a second drive wheel connected to the second drive assembly, the second drive assembly has a second transmission ratio; A control module is communicatively connected to the first drive assembly and the second drive assembly, and the control module is used to control the first drive assembly to drive the first drive wheel to rotate around its own central axis at the first transmission ratio so that the tractor can move at a first speed and be in a traction state, or control the second drive assembly to drive the second drive wheel to rotate around its own central axis at the second transmission ratio so that the tractor can move at a second speed greater than the first speed and be in a fast return state.

2. The tractor according to claim 1, characterized in that: The first drive assembly includes a first drive member and a first reducer, the first reducer has a first transmission shaft and a second transmission shaft that are transmission-connected to each other, the first drive member is connected to the first transmission shaft, the first drive wheel is connected to the second transmission shaft, and the first transmission ratio is formed between the second transmission shaft and the first transmission shaft; One end of the second transmission shaft is also sleeved with a clutch mechanism that is transmission-connected to the first drive wheel. The clutch mechanism can engage with the second transmission shaft when the tractor is in the traction state, or release the second transmission shaft when the tractor is in the quick return state.

3. The tractor according to claim 2, characterized in that: Central axes of the first transmission shaft and the second transmission shaft are perpendicular to each other.

4. The tractor according to claim 2, characterized in that: The traction device also includes a third transmission shaft and a transmission assembly, one end of the transmission assembly is connected to the clutch mechanism, and the other end is connected to one end of the third transmission shaft in its own axial direction, the third transmission shaft is connected to the first driving wheel at one end of its own axial direction away from the transmission assembly, and the central axes of the third transmission shaft and the second transmission shaft are parallel to each other.

5. The tractor according to claim 4, characterized in that: The transmission assembly comprises a first transmission wheel and a second transmission wheel which are in transmission connection with each other and whose central axes are parallel to each other. The first transmission wheel is fixedly sleeved on the clutch mechanism, and the second transmission wheel is fixedly sleeved on the third transmission shaft.

6. The tractor according to claim 5, characterized in that: The first transmission wheel and the second transmission wheel are both gears, which are meshed with each other and have the same diameter.

7. The tractor according to claim 4, characterized in that: The first transmission shaft and the second transmission shaft are parallel to each other, and the first driving member and the clutch mechanism are located at the same end of the traction device.

8. The tractor according to claim 1, characterized in that: The second drive assembly includes a second drive member and a second reducer, the second drive member is connected to the input end of the second reducer, the second drive wheel is connected to the output end of the second reducer, and the second transmission ratio is formed between the output end of the second reducer and the input end of the second reducer.

9. The tractor according to claim 1, characterized in that: The support assembly includes a frame and a chassis installed at the bottom of the frame, the first drive assembly and the second drive assembly are installed in the frame, the first drive wheel and the second drive wheel are protruding relative to the bottom side of the chassis, and a guide block is installed on the bottom side of the chassis. The guide block is used to be slidably connected with an external guide rail when the tractor moves to guide the tractor.

10. A seam welding device, characterized in that: Comprising the tractor according to any one of claims 1-9.

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