Cargo tractor suitable for mountainous environments

Abstract

This application discloses a cargo traction machine suitable for mountainous environments, mainly solving the technical problems of existing transport machines being affected by the weight of the towed cargo and the difficulty in quickly and conveniently winding and unwinding the traction wire rope. It includes a base, an engine fixed to the base, an electromagnetic friction clutch whose power shaft is correspondingly connected to the engine's power output shaft, and a gearbox whose power shaft is connected to the electromagnetic friction clutch and has a first output shaft and a second output shaft on both sides. A wire rope winding and unwinding pulley, hinged to the base, is correspondingly connected to the first output shaft. The second output shaft is connected to a double-roller assembly via a right-angle reversing component. The double-roller assembly includes two vertically parallel rollers connected by a chain, each roller having several annular grooves evenly spaced along its axial direction for winding the traction wire rope. This traction machine is convenient, flexible, stable, and low in cost.

Description

Technical Field

[0001] This application relates to the field of traction transport equipment, specifically to a cargo tractor suitable for mountainous environments. Background Technology

[0002] In mountainous environments, due to complex terrain, steep slopes, and narrow and rugged roads, traditional transportation methods (such as vehicles and manual labor) often face problems such as low efficiency, high cost, and poor safety. Using tractor units to transport materials such as timber, stones, and power lines has become a key technological means to solve the transportation challenges in mountainous areas. Tractor units can be set up in complex terrain environments, efficiently transporting materials such as timber through mechanized means. Compared with traditional transportation methods, this not only greatly shortens transportation time but also effectively reduces transportation costs. Furthermore, it reduces damage to forest vegetation caused by the construction of transportation routes, contributing to the protection of the ecological environment.

[0003] A patent document with publication number CN215556469U, known to the inventor, discloses a hillside transport machine, which includes a steel wire rope connected end to end, a first steering assembly, and a second steering assembly. The first and second steering assemblies are mounted on the steel wire rope and divide it into a transport section and a return section. Several third steering assemblies are arranged between the first and second steering assemblies to change the running direction of the transport and return sections. Several hooks are also provided on the steel wire rope. This mechanism uses the movement of the steel wire rope to move objects suspended on the hooks, solving the problem of low work efficiency caused by manual handling in existing technologies.

[0004] However, in the process of implementing the technical solution in the embodiments of this application, the inventors of this application found that the drive device structure of the above-mentioned hillside transport machine is relatively simple, the driving force it can provide is single and limited, and the weight of the items to be towed and transported is not fixed. As a result, the operating speed of the transport machine is affected by the weight of the towed object, resulting in poor flexibility. Furthermore, the steel wire rope used requires a separate steel wire rope winding and unwinding device when performing winding and unwinding operations, which is cumbersome and costly.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the background technology of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] In view of at least one of the above technical problems, this disclosure provides a cargo tractor suitable for mountainous environments, which mainly solves the technical problem that the operation of existing transport machines is affected by the weight of the towed cargo and that it is difficult to quickly and conveniently retract and extend the tractor wire rope.

[0007] According to one aspect of this disclosure, a cargo tractor suitable for mountainous environments is provided, comprising a base, an engine fixed to the base, an electromagnetic friction clutch whose power shaft is correspondingly connected to the power output shaft of the engine, and a gearbox whose power shaft is connected to the electromagnetic friction clutch and whose two sides are respectively provided with a first output shaft and a second output shaft; the first output shaft is correspondingly connected to a wire rope take-up and release pulley that is correspondingly hinged to the base, and the second output shaft is correspondingly connected to a double roller assembly through a right-angle reversing assembly; the double roller assembly includes two rollers arranged vertically parallel to each other and correspondingly driven by a chain, and each roller surface is provided with a plurality of annular rope grooves at equal intervals along the roller axial direction for corresponding winding of a traction wire rope.

[0008] In some embodiments of this disclosure, pulleys are fixedly provided at the power output shaft of the engine and the power shaft of the electromagnetic friction clutch, and belt drives are connected between the power output shaft of the engine and the power shaft of the electromagnetic friction clutch.

[0009] In some embodiments of this disclosure, the electromagnetic friction clutch is fixed relative to the seat body via a clutch bracket, and a heat dissipation component for dissipating heat from the electromagnetic friction clutch is also fixedly provided at the clutch bracket.

[0010] In some embodiments of this disclosure, a plurality of reduction gear sets are respectively provided between the input shaft of the transmission and the first output shaft and the second output shaft; the transmission is fixed to the seat.

[0011] In some embodiments of this disclosure, the first output shaft and the second output shaft are the same shaft extending from both sides of the transmission.

[0012] In some embodiments of this disclosure, the wire rope take-up and release reel includes a reel and a rotating shaft arranged along the axial direction of the reel. The two ends of the rotating shaft are respectively rotatably connected to the base body through bearing seats. A transmission sprocket is provided at the corresponding side end of the rotating shaft and at the first output shaft. The first output shaft and the wire rope take-up and release reel are connected by a corresponding chain drive.

[0013] In some embodiments of this disclosure, the drive sprocket at the shaft is connected to the shaft via a pin.

[0014] In some embodiments of this disclosure, the right-angle deflector includes a transverse bevel gear fixed to the end of the second drive shaft, a vertical shaft perpendicular to the second drive shaft, and a vertical bevel gear fixed to the vertical shaft and meshing with the transverse bevel gear.

[0015] In some embodiments of this disclosure, the dual-roller assembly further includes a coupling fixedly connected to the shaft of any roller and used for transmission connection with the vertical shaft; both ends of each roller are respectively fixedly connected to the base body via spherical bearings.

[0016] In some embodiments of this disclosure, the double roller assembly further includes a chain tensioning assembly disposed at the pivot of any of the rollers; the chain tensioning assembly includes two tensioning units, each tensioning unit including an annular plate for passing through the pivot of the roller, a wing plate fixed to the side of the annular plate and perpendicular to the roller axis, and a pressure sprocket rotatably connected to the end of the wing plate and correspondingly meshing with the chain between the rollers; the two wing plates of the two tensioning units are arranged at a certain included angle and the pressure sprockets of the two tensioning units are respectively disposed on both sides of the chain between the rollers, and a tension spring is provided between the two wing plates of the two tensioning units.

[0017] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: 1. By installing a gearbox between the engine and the twin-drum assembly used for traction of the wire rope, the traction rate of the twin-drum assembly on the wire rope can be adjusted as needed, ensuring the relative stability of the traction operation; at the same time, by adjusting the output of the gearbox, the operation of the wire rope take-up and release wheel is not adversely affected by the diameter of the wire rope coil, ensuring the reliability and stability of the wire rope take-up and release.

[0018] 2. The wire rope take-up and release reel is integrated into the traction machine base and shares the same power source with the double roller assembly drive. This avoids the problems of complicated operation and high cost caused by the need to select separate take-up and release equipment when taking up and releasing wire ropes.

[0019] 3. An electromagnetic friction clutch located in the power transmission path between the engine and the transmission can effectively control the power transmission, realize the on-demand disconnection and connection of power, and is simple, convenient and quick to operate. It can avoid the time delay caused by frequent engine start and stop.

[0020] 4. The chain tensioning assembly can achieve the tensioning effect on the chain of the double roller assembly, avoiding problems such as slippage and transmission failure due to chain slack, thereby ensuring synchronous rotation between the two rollers and guaranteeing effective and reliable traction of the wire rope. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of a cargo tractor in one embodiment of this application.

[0022] Figure 2 This is a partial structural diagram of a cargo tractor in one embodiment of this application.

[0023] Figure 3This is a partial structural schematic diagram of the gearbox and dual roller assembly in one embodiment of this application.

[0024] Figure 4 This is a schematic diagram of the transmission structure of the wire rope winding and unwinding wheel in one embodiment of this application.

[0025] Figure 5 This is a schematic diagram of the internal structure of a right-angle reversing component in one embodiment of this application.

[0026] Figure 6 This is a schematic diagram of the chain tensioning assembly in one embodiment of this application.

[0027] In the above figures, 1 is the base, 2 is the engine, 21 is the engine pulley, 22 is the belt tensioning assembly, 3 is the wire rope take-up and release pulley, 31 is the pulley, 32 is the bearing seat, 33 is the pin, 4 is the double roller assembly, 41 is the roller, 42 is the roller shaft, 43 is the wing plate, 44 is the pressure sprocket, 45 is the tension spring, 5 is the electromagnetic friction clutch, 51 is the clutch pulley, 52 is the clutch bracket, 53 is the heat dissipation assembly, 6 is the gearbox, 61 is the first output shaft, 7 is the right-angle reversing assembly, 71 is the transverse bevel gear, 72 is the vertical shaft, and 73 is the vertical bevel gear. Detailed Implementation

[0028] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "vertical," "horizontal," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this application. The terms "first," "second," etc., used in this application are used to distinguish the described objects and do not have any sequential or technical meaning. And the terms "connection" and "linkage," unless otherwise specified, include both direct and indirect connections (linkages).

[0029] The programs involved or relied upon in the following embodiments are all conventional or simple programs in this technical field, and those skilled in the art can make conventional selections or adaptive adjustments according to specific application scenarios. Unless otherwise specified, the devices involved in the following embodiments are all conventional commercially available products.

[0030] To better understand the technical solution of this application, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Existing transport vehicles suffer from operational stability affected by the weight of the towed cargo, and require separate cable winding and unwinding equipment, resulting in significant costs and operational complexity. Therefore, this example discloses a cargo traction machine suitable for mountainous environments. (See [reference]). Figure 1 It includes a base 1, an engine 2, a wire rope winding and unwinding reel 3, and a double roller assembly 4.

[0032] The base 1 serves as the main load-bearing platform for the cargo tractor, with each component fixedly mounted thereon. In this example, the base 1 has a frame structure, which ensures structural strength while reducing the overall weight of the base, facilitating transportation in complex mountainous environments. The engine 2 serves as the power source for the cargo tractor, providing the necessary power for traction. In this embodiment, the engine 2 is a diesel engine and is fixed to one corner of the base 1. See [reference needed]. Figure 1 A protective net is installed on one side of the diesel engine to protect it and prevent it from being bumped or damaged during transportation and actual traction, which could lead to power loss or even oil leaks and other safety accidents and risks. It also prevents the operator from touching the diesel engine, which has been heated up due to prolonged operation, thus protecting the operator.

[0033] To achieve traction on the wire rope, thereby enabling the transport of goods suspended on the wire rope along its installation path, see [link to relevant documentation]. Figure 1 The cargo traction machine includes a double-drum assembly, the rotation of which drives the rotation of the wire rope wound around the double-drum assembly. Meanwhile, to facilitate the unwinding and rewinding of the wire rope before and after cargo transportation, in this embodiment, see... Figure 1 The cargo traction machine is also equipped with a wire rope take-up and release reel 3. This reel 3 allows for the take-up and release of the wire rope after cargo transport is completed and during the next wire rope deployment, avoiding the need for additional separate equipment and improving the integration and ease of use of the device. Considering that both the double roller assembly 4 and the wire rope take-up and release reel 3 require a power source, in this example, to enable the transmission of power from the diesel engine to the roller assembly 4 and the wire rope take-up and release reel 3, the cargo traction machine also includes an electromagnetic friction clutch 5 and a gearbox 6.

[0034] The electromagnetic friction clutch 5 is used to achieve power control in power transmission, completing functions such as starting and braking. Specifically, when the electromagnetic friction clutch 5 is energized, the power generated by the engine can be transmitted to the rear components, and when the electromagnetic friction clutch 5 is de-energized, the power generated by the engine stops being transmitted to the rear, thereby achieving the purpose of power control in power transmission.

[0035] See Figure 2An engine pulley 21 is fixedly mounted on the power output shaft of engine 2, and a clutch pulley 51 is fixedly mounted on the power shaft of electromagnetic friction clutch 5. In this example, the engine pulley 21 and the engine power shaft, and the clutch pulley 51 and the clutch power shaft are respectively connected by a key. Thus, power is transmitted from engine 2 to electromagnetic friction clutch 5 via a belt fitted between the two pulleys. However, in this embodiment, considering that factors such as assembly and service life may cause the belt to loosen, resulting in slippage between the belt and the pulleys and affecting power transmission, this embodiment refers to... Figure 2 To achieve belt tensioning, a belt tensioning assembly 22 is fixedly installed at the base 1. The belt tensioning assembly 22 includes a connecting plate fixed at the base 1. A strip-shaped adjustment hole is opened at the connecting plate in the vertical direction, that is, perpendicular to the line connecting the two pulleys. A pressure wheel passes through the adjustment hole, and the pressure wheel is pressed and fixed at the connecting plate by bolts. At the same time, there is interference between the wheel body of the pressure wheel and the belt. In this example, the pressure wheel is above the belt and its axis is perpendicular to the belt. Therefore, by adjusting the position of the pressure wheel in the strip-shaped adjustment hole, the pressure wheel is pressed down accordingly, and the belt bends downward under the action of the pressure wheel, thereby achieving belt tensioning. At the same time, since the pressure wheel can rotate with the rotation of the belt, it will not adversely affect the rotation of the belt while achieving the tensioning effect.

[0036] In this embodiment, see Figure 2 The electromagnetic friction clutch 5 is fixedly mounted on the seat by the clutch bracket 52. Considering that the electromagnetic friction clutch 5 will generate a certain amount of heat when performing power control, in order to avoid the electromagnetic friction clutch overheating and affecting its normal use, a heat dissipation component 53 is also fixedly mounted on the clutch bracket 52. In this example, the heat dissipation component 53 is specifically a cooling fan, and the cooling fan is located directly below the electromagnetic friction clutch 5. The rotation of the fan blades accelerates the airflow around the electromagnetic friction clutch, thereby achieving the heat dissipation effect.

[0037] Considering that the drive speed of the twin-drum assembly on the wire rope changes with the weight of the traction cargo, and given that the wire rope used for traction is extremely long, the coil diameter of the wire rope on the take-up and release wheel continuously increases as the rope is retracted. Under a certain torque, a larger lever arm results in a smaller tension. Consequently, at the end of the wire rope retraction, the tension on the wire rope is very small, and it may even be impossible to completely retract the remaining rope. Therefore, in this embodiment, a gearbox 6 is provided to address the adverse effects of cargo weight on the operation of the traction machine and the adverse effects of wire rope length on the winding of the wire rope take-up and release wheel. For details, see... Figure 2 The transmission 6 is fixed to the seat, and the power shaft of the electromagnetic friction clutch 5 is connected to the input shaft of the transmission 6 through a coupling, thereby realizing the transmission of power from the engine 2 to the transmission 6.

[0038] To avoid increasing equipment cost, weight, and size by requiring an additional drive mechanism after integrating the wire rope take-up and release reel 3, therefore, in this embodiment, see... Figure 3 The transmission 6 has two output shafts: a first output shaft 61 and a second output shaft. These two output shafts are located on opposite sides of the transmission 6 to optimize the space available in the housing 1. In this embodiment, several reduction gear sets are installed inside the transmission 6 between the input shaft and the first and second output shafts. These reduction gear sets use smaller diameter gears to drive larger diameter gears, reducing speed and increasing torque. This ensures that the torque output by the transmission is sufficient for traction of wire ropes carrying cargo and for wire rope winding. Furthermore, a control handle is provided at the transmission. This handle controls the meshing relationship of the gear sets within the transmission, thereby changing the output torque of the first and second output shafts to adapt to the actual power requirements of the working environment and ensure the smooth and reliable operation of the traction machine. The first output shaft 61 is used for transmission connection with the wire rope winding and unwinding wheel, and the second output shaft is used for transmission connection with the double roller assembly.

[0039] For details, see Figure 4 The wire rope take-up and unwinding reel 3 includes a reel 31 for winding the wire rope. A rotating shaft is provided along the central axis of the reel 31. To achieve the rotation of the reel 31, both ends of the rotating shaft are fixed to the base 1 by bearing seats 32, so that the reel 31 can rotate relative to the base under the action of the bearing seats, thereby realizing the winding and unwinding action of the wire rope. However, in order to transmit the power output by the gearbox 6 to the rotating shaft of the wire rope take-up and unwinding reel and drive the reel 31 to rotate, in this embodiment, a transmission sprocket is fixedly provided at the end of the rotating shaft of the wire rope take-up and unwinding reel near the gearbox, and a transmission sprocket is also provided at the end of the first output shaft. Thus, the power is transmitted from the gearbox 6 to the wire rope take-up and unwinding reel 3 through the transmission chain meshing with the two transmission sprockets. However, considering that the wire rope take-up and release wheel does not need to rotate during normal traction operations, it is necessary to disconnect the transmission connection between the first output shaft 61 and the wire rope take-up and release wheel 3 as needed. Therefore, in this embodiment, pin holes are provided at the transmission sprocket at the shaft of the wire rope take-up and release wheel and at the shaft itself. See [reference needed]. Figure 4 By inserting pins 33 into the pin holes at the drive sprocket and the shaft, the drive sprocket and the shaft are fixed together, and power can be transmitted to the wheel. When the pins 33 are pulled out, the drive sprocket and the shaft can rotate relative to each other, thereby disconnecting the transmission connection between the wire rope take-up and release wheel 3 and the first output shaft 61, so that the wire rope take-up and release wheel can rotate as needed.

[0040] See Figure 2In this embodiment, to facilitate the transportation of goods and make reasonable use of the device space, the double roller assembly is arranged vertically, thereby making the power input shaft of the double roller assembly and the second output shaft of the transmission 6 perpendicular to each other. However, to achieve power transmission between the two perpendicularly positioned components, in this embodiment, see... Figure 3 A right-angle reversing component 7 is installed to enable power transmission between shafts in different directions. For details, see [link to details]. Figure 5 The right-angle reversing assembly 7 includes a housing. In this embodiment, the second output shaft of the transmission is coaxial with the first output shaft and belongs to the same shaft body. The second output shaft is connected to one side wall of the right-angle reversing assembly housing via a bearing, and a transverse bevel gear 71 is fixedly provided at the end of the second output shaft. Additionally, a vertical shaft 72 is provided perpendicular to the second output shaft and along the arrangement direction of the double roller assembly. This vertical shaft 72 is also fixed to the wall of the right-angle reversing assembly 7 via a bearing. See [link to relevant documentation]. Figure 5 A vertical bevel gear 73 is fixedly installed in the vertical shaft 72, which meshes with the horizontal bevel gear 71. Thus, the direction of force transmission can be changed through the meshing between the horizontal bevel gear 71 and the vertical bevel gear 73, so that the power is transmitted from the second output shaft to the vertical shaft 72.

[0041] See Figure 3 In this embodiment, the dual-roller assembly includes two rollers 41, which are parallel to each other and arranged vertically. During traction operations, the traction wire rope is wound around the two rollers, and the friction between the rollers and the wire rope drives the wire rope to move. The two ends of the roller shafts are fixed to corresponding brackets on the base via spherical bearings, and are located above the gearbox and right-angle deflector assembly, making full use of the vertical space. To achieve power input for the dual-roller assembly, in this example, the shaft of one roller is fixedly connected to the vertical shaft 72 of the right-angle deflector assembly 7 via a coupling. This allows power to be transmitted from the vertical shaft to the roller shaft. However, considering that the two rollers need to move synchronously and at the same speed when the wire rope is being pulled, and the vertical shaft is only connected to one roller, therefore, see [reference needed]. Figure 3 In this example, chain wheels are fixedly installed at the shafts of the two rollers 41 respectively, thereby transmitting power between the rollers through the chains meshing with the two chain wheels, and enabling the two rollers to rotate synchronously.

[0042] Furthermore, when traction of goods, considering the relatively long length of the wire rope and the weight of the goods, it is necessary to ensure sufficient friction between the two rollers used to drive the wire rope and the wire rope itself. Therefore, in this example, the wire rope is wound sequentially between the two rollers multiple times. To prevent contact and friction between adjacent sections of the wound wire rope as the rollers roll, see [reference needed]. Figure 3In this example, several annular rope grooves are equally spaced on the surfaces of the two rollers 41. Thus, when the wire rope is coiled, the rope is placed into the corresponding groove, ensuring that the wire rope is coiled in an orderly manner between the two rollers and makes full and effective contact with the rollers, so that the rollers provide the traction power for the wire rope.

[0043] Considering the possibility of chain loosening between the two rollers 41, a chain tensioning assembly is provided in this embodiment to tension the slack chain. For details, see... Figure 6 The chain tensioning assembly includes two tensioning units set at the roller shaft. To achieve this, each tensioning unit includes an annular plate with an inner diameter matching the outer diameter of the roller shaft 42. A wing plate 43 extends from the side of this annular plate, and the plane of the wing plate 43 is perpendicular to the axial direction of the roller shaft 42, meaning the wing plate 42 is parallel to the plane of the chain in the double roller assembly. Furthermore, a through hole is provided at the end of the wing plate 43, through which a pressure sprocket 44 is inserted. The pressure sprocket 44 engages with the chain from the outside of the chain in the double roller assembly. Simultaneously, a tension spring 45 is provided between the two wing plates 43 of the two tensioning units. Thus, the annular plates of the two tensioning units are fitted onto the same roller shaft, with the two wing plates at a certain angle and engaging with the chain from the outside on both sides. Under the tension of the tension spring 45, the chain is pressed, thereby achieving the tensioning effect of the chain in the double roller assembly.

[0044] Furthermore, in this embodiment, the cargo tractor also includes an electronic control component, specifically a control box fixed to the seat and a portable wireless remote controller, used to control the start and stop of the tractor, the engine throttle speed, and to control the switching on and off of power transmission via the electromagnetic friction clutch. Additionally, to provide the necessary power to the electronic control component and the diesel engine starter motor, the cargo tractor in this example also includes a battery located at the seat.

[0045] Although some preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0046] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.

Claims

1. A cargo tractor suitable for use in mountainous environments, characterized in that, The system includes a base, an engine fixed to the base, an electromagnetic friction clutch whose power shaft is correspondingly connected to the engine's power output shaft, and a gearbox whose power shaft is connected to the electromagnetic friction clutch and whose two sides are respectively provided with a first output shaft and a second output shaft; the first output shaft is correspondingly connected to a wire rope take-up and release pulley that is hinged to the base, and the second output shaft is connected to a double roller assembly through a right-angle reversing component; the double roller assembly includes two rollers arranged vertically parallel to each other and correspondingly driven by a chain, and each roller surface has a plurality of annular rope grooves at equal intervals along the roller axis for corresponding winding of traction wire rope.

2. The cargo tug of claim 1, wherein, The engine's power output shaft and the electromagnetic friction clutch's power shaft are respectively equipped with pulleys, and the engine's power output shaft and the electromagnetic friction clutch's power shaft are connected by corresponding belt drives.

3. The goods tractor according to claim 1 or 2, characterized in that The electromagnetic friction clutch is fixed relative to the seat body via a clutch bracket, and a heat dissipation component for cooling the electromagnetic friction clutch is also fixed at the clutch bracket.

4. The cargo tractor according to claim 1, characterized in that, The transmission is provided with several reduction gear sets between the input shaft and the first and second output shafts; the transmission is fixed to the seat.

5. The cargo tug of claim 1, wherein, The first output shaft and the second output shaft are the same shaft extending from both sides of the transmission.

6. The cargo tug of claim 1, wherein, The wire rope take-up and release reel includes a reel and a rotating shaft arranged along the axial direction of the reel. Both ends of the rotating shaft are respectively rotatably connected to the base body through bearing seats. A transmission sprocket is provided at the corresponding side end of the rotating shaft and at the first output shaft. The first output shaft and the wire rope take-up and release reel are connected by a corresponding chain drive.

7. The cargo tug of claim 6, wherein, The drive sprocket at the rotating shaft is connected to the rotating shaft via a pin.

8. The cargo tug of claim 1, wherein, The right-angle reversing assembly includes a transverse bevel gear fixed to the end of the second output shaft, a vertical shaft perpendicular to the second output shaft, and a vertical bevel gear fixed to the vertical shaft and meshing with the transverse bevel gear.

9. The cargo tug of claim 8, wherein, The dual-roller assembly also includes a coupling that is fixedly connected to the shaft of any of the rollers and is used for transmission connection with the vertical shaft; both ends of each roller are respectively fixedly connected to the base body via spherical bearings.

10. The cargo tractor of claim 1 or 9, characterized in that, The dual-roller assembly further includes a chain tensioning assembly located at the pivot of any of the rollers; the chain tensioning assembly includes two tensioning units, each tensioning unit including an annular plate for passing through the pivot of the roller, a wing plate fixed to the side of the annular plate and perpendicular to the roller axis, and a pressure sprocket rotatably connected to the end of the wing plate and correspondingly meshing with the chain between the rollers; the two wing plates of the two tensioning units are arranged at a certain angle and the pressure sprockets of the two tensioning units are respectively located on both sides of the chain between the rollers, and a tension spring is provided between the two wing plates of the two tensioning units.

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