Loading and unloading device for vehicle

Abstract

The utility model provides a loading and unloading device for a vehicle, belongs to the field of vehicle logistics transportation, and solves the problem that the existing loading and unloading device is poor in applicability and structural stability. The loading and unloading device for the vehicle comprises a support arranged on a vehicle cargo carrying platform, a first hydraulic cylinder and a lifting hook, and is characterized by further comprising a support, the support comprises a cross arm and two telescopic arms, each telescopic arm comprises a first rod and a second rod which are connected in a sliding mode, the two first rods are hinged to the side, close to the vehicle tail, of the support, and the two second rods are hinged to the side, close to the vehicle tail, of the support. The two second rods are fixedly connected with the two ends of the cross arm respectively, the two ends of the first hydraulic cylinder are hinged to the first rod and the side, close to the vehicle head, of the support respectively, and a lifting hook is arranged on the cross arm. According to the loading and unloading device for the vehicle, the applicability and the structural stability are improved.

Description

Technical Field

[0001] The utility model belongs to the field of automobile logistics transportation and relates to a vehicle loading and unloading device. Background Art

[0002] At present, automobile logistics transportation has penetrated into all walks of life. For example, the transportation of bagged cement and bagged feed requires the use of special loading and unloading transfer equipment to load and unload the goods on the vehicle's cargo platform before and after the transportation begins. In situations where loading and unloading conditions are met, cranes, forklifts and other loading and unloading machinery can be used to complete the loading and unloading operations. However, when the site is limited or there is a lack of loading and unloading machinery, the loading and unloading of goods can only be done manually, which is not only labor-intensive, low in work efficiency, and high in loading and unloading costs, but also easy to cause personal injury and damage to goods. To this end, a Chinese patent application (application number: 202310983315.1) discloses a grassland forage loading, unloading and transporting device, including a motorized tricycle, which includes a cab, a base plate, wheels and a cargo compartment; a turntable is rotatably connected in the cargo compartment, a boom support and an oil cylinder are fixedly connected to the turntable, a hydraulic control system for controlling the movement of the oil cylinder is provided in the cab, a boom is hinged at the other end of the boom support, an end of the boom close to the boom support is fixedly connected to the output end of the oil cylinder, and a clamping assembly is provided at the end of the boom away from the boom support.

[0003] However, the above method has the following defects: 1. The load-bearing capacity of the hook is concentrated on a single boom, which is prone to deformation or twisting when subjected to high loads, and the single boom is greatly affected by lateral forces, and the overall structural stability of the loading and unloading device is poor. 2. If you want to operate the goods close to the front of the vehicle, you need to raise the boom and then lower the hook, which requires sufficient working height and is difficult to work normally in an environment with limited height; when lowering the boom, the hook moves to the rear of the vehicle and then loads and unloads the goods. Specifically, the actual length of the boom is fixed, and the position for loading and unloading the goods is also fixed relative to the vehicle body. The hook position cannot be flexibly adjusted according to the actual position of the goods, and the hook cannot flexibly transport the goods to positions at different distances from the rear of the vehicle. Personnel are required to carry the goods to the appropriate position. In summary, the applicability of the loading and unloading device is poor. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems in the prior art and to propose a vehicle loading and unloading device. The technical problem to be solved by the utility model is: how to improve the applicability and structural stability of the loading and unloading device.

[0005] The object of the present utility model can be achieved by the following technical solutions: A vehicle loading and unloading device includes a support, a first hydraulic cylinder, and a hook disposed on the vehicle loading platform. It is characterized in that the loading and unloading device further includes a bracket, the bracket includes a cross arm and two telescopic arms, the telescopic arm includes a rod one and a rod two that are slidably connected, the two rod ones are respectively hinged to one side of the support close to the vehicle tail, the two rod twos are respectively fixedly connected to both ends of the cross arm, the two ends of the first hydraulic cylinder are respectively hinged to the rod one and one side of the support close to the vehicle head, and a hook is provided on the cross arm.

[0006] This vehicle loading and unloading device is disposed on the vehicle loading platform and includes a support, a first hydraulic cylinder, a hook, and a bracket. The bracket includes a cross arm and two telescopic arms. The telescopic arm includes a rod one and a rod two that are slidably connected. Personnel can remotely control the rod two to approach or move away from the rod one, that is, to extend or shorten the telescopic arm. The two rod ones are respectively hinged to one side of the support close to the vehicle tail, the two rod twos are respectively fixedly connected to both ends of the cross arm, the two ends of the first hydraulic cylinder are respectively hinged to the rod one and one side of the support close to the vehicle head, and a hook is provided on the cross arm. During operation, remotely control the first hydraulic cylinder to shorten, pull the bracket to swing towards the vehicle head direction. At the same time, the length of the telescopic arm can be remotely adjusted, so that the hook moves to a suitable position to load and unload the goods; remotely control the first hydraulic cylinder to extend, push the bracket to swing towards the vehicle tail direction. At the same time, the length of the telescopic arm can be remotely adjusted, so that the hook moves to a suitable position to load and unload the goods. Telescopic arms are respectively provided at both ends of the cross arm. The double telescopic arms simultaneously support the cross arm, which can not only more evenly share the bearing capacity of the hook, but also effectively prevent the hook from driving the bracket to shake under the influence of lateral force, effectively improving the structural stability and working reliability of the loading and unloading device. When the bracket is propped up, the telescopic arm can be retracted to avoid the overall height of the loading and unloading device being too high, and the height requirement for the working space is relatively low; when the bracket is lowered, the telescopic arm can be retracted to avoid the overall length of the loading and unloading device along the vehicle body length direction being too long, and the area requirement for the working space is relatively low, enabling the loading and unloading device to adapt to a changing working environment and effectively improving the applicability of the loading and unloading device. When the first hydraulic cylinder pushes the bracket to swing towards the vehicle tail direction to the limit position, the length of the telescopic arm can be adjusted. According to actual needs, the hook can be further made to approach or move away from the loading platform, that is, the position for loading and unloading the goods can be flexibly adjusted relative to the vehicle body, enabling the loading and unloading device to adapt to a changing working environment without manually moving the goods to a suitable position, effectively improving the applicability of the loading and unloading device.

[0007] In the above-mentioned vehicle loading and unloading device, a mounting hole is provided in the rod 1 along its length direction, and a hydraulic cylinder 2 is provided in the mounting hole. The hydraulic cylinder 2 includes a cylinder barrel and a piston rod, and the cylinder barrel is fixed in the mounting hole. The piston rod is fixedly connected to the rod 2, and the piston rod can move in the mounting hole to make the rod 2 approach or move away from the rod 1. The hydraulic cylinder 2 is fixedly connected by the cylinder barrel and the mounting hole, and is fixedly connected by the piston rod and the rod 2, that is, the rod 1 and the rod 2 are slidably connected by the hydraulic cylinder 2, and a person can remotely control the piston rod to slide relative to the cylinder barrel, and the piston rod moves in the mounting hole to make the rod 2 approach or move away from the rod 1. The design of the mounting hole allows the hydraulic cylinder 2 to be completely embedded in the rod 1, making the overall structure of the loading and unloading device more compact and efficient.

[0008] In the above-mentioned vehicle loading and unloading device, the mounting hole is a blind hole, the end surface of the cylinder barrel is pressed against the bottom surface of the mounting hole, and the outer side wall of the cylinder barrel is pressed against the inner side wall of the mounting hole. The bottom surface of the blind hole provides stable support for the hydraulic cylinder 2, ensuring the stability of the loading and unloading device. When the hydraulic cylinder 2 and the rod 1 are installed, the bottom surface of the blind hole plays a positioning role in the installation position of the cylinder barrel. The outer side wall of the cylinder barrel is pressed against the inner side wall of the mounting hole, which can effectively prevent external dust and impurities from entering and causing pollution.

[0009] In the above vehicle loading and unloading device, the end of the second rod fixedly connected to the piston rod can be inserted into the mounting hole. The first rod and the second rod form an inner and outer sliding plug-in structure, which is compact in structure and reduces the vibration frequency and amplitude during operation, effectively improving the structural stability and working reliability of the loading and unloading device.

[0010] In the above-mentioned vehicle loading and unloading device, the support includes a cross bar and two side bars respectively connected to the two ends of the cross bar, the side bars extend along the length direction of the cargo platform, and the hydraulic cylinder 1 and rod 1 on the same side are respectively hinged to the side bars on this side. The cross bar is arranged in conjunction with the side bars, which helps to improve the supporting force of the support. The hydraulic cylinder 1 and rod 1 on the same side form two hinge points with the side bars on this side. The side bars play a guiding role in the two hinge points on their side, which helps to align the hinge points along the length direction of the cargo platform, so that the hydraulic cylinder 1 and rod 1 swing or extend in the same plane during operation, avoiding additional stress caused by structural misalignment or uneven torque during operation, reducing vibration or shaking during operation, and effectively improving the structural stability and working reliability of the loading and unloading device.

[0011] For the above-mentioned vehicle loading and unloading device, a first limiting member and a second limiting member are provided on the side rod. The first limiting member and the second limiting member are respectively located on both sides of the hinge point between the first rod and the side rod, and inclined planes facing the first rod are provided on the top surfaces of the first limiting member and the second limiting member. The side walls of the first rod facing the first limiting member and the second limiting member are both flat surfaces. The first limiting member and the second limiting member jointly limit the swinging range of the bracket and prevent the bracket from falling and hitting the vehicle body and people in case of a malfunction and out-of-control of the first hydraulic cylinder. When the first hydraulic cylinder drives the first rod to swing to the extreme position towards the head of the vehicle, the side wall of the first rod facing the first limiting member abuts against the top inclined plane of the first limiting member. When the first hydraulic cylinder drives the first rod to swing to the extreme position towards the tail of the vehicle, the side wall of the first rod facing the second limiting member abuts against the top inclined plane of the second limiting member. The abutment between the flat surfaces effectively improves the structural stability. At the same time, the heights of the first limiting member and the second limiting member can be reasonably set according to the actual situation to prevent the bracket from hitting the cab at the head of the vehicle or people passing by at the tail when the bracket swings to the extreme position.

[0012] For the above-mentioned vehicle loading and unloading device, the second rod is cylindrical. The second rod is designed to be cylindrical, and the sliding surface is smoother, which helps the second rod to slide more smoothly relative to the first rod. At the same time, the second rod is designed to be cylindrical, which helps to align with the first rod more easily and reduces the strict requirements for installation and alignment.

[0013] For the above-mentioned vehicle loading and unloading device, a fixed block, a wire wheel and a reel are provided on the cross arm. A transition block is provided on the hook, and the side wall of the transition block is a smooth arc surface. The fixed block is fixedly connected with a pull rope. One end of the pull rope successively bypasses the transition block and the wire wheel, and this end is connected to the reel and is tensioned under the action of the reel. The side wall of the transition block is a smooth arc surface, which helps the pull rope to stretch smoothly. By rotating the reel to adjust the length of the pull rope, the height of the hook is adjusted, that is, relative to the vehicle body, the position for loading and unloading the goods can be flexibly adjusted, so that the loading and unloading device can adapt to the changing working environment and effectively improves the applicability of the loading and unloading device.

[0014] For the above-mentioned vehicle loading and unloading device, a slider is further provided on the cross arm. The slider can slide along the length direction of the cross arm, and the slider is fixed to the wire wheel. The slider drives the wire wheel to slide along the length direction of the cross arm, so that the hook moves along the width direction of the vehicle body, that is, relative to the vehicle body, the position for loading and unloading the goods can be flexibly adjusted, so that the loading and unloading device can adapt to the changing working environment and effectively improves the applicability of the loading and unloading device.

[0015] Compared with the prior art, the vehicle loading and unloading device has the following advantages:

[0016] 1. In the loading and unloading device for this vehicle, telescopic arms are respectively arranged at both ends of the cross arm. The double telescopic arms support the cross arm at the same time, which can not only more evenly share the bearing capacity of the lifting hook, but also effectively prevent the lifting hook from driving the bracket to shake under the influence of lateral force, effectively improving the structural stability and working reliability of the loading and unloading device.

[0017] 2. In the loading and unloading device for this vehicle, when the bracket is lifted, the telescopic arms can be retracted to avoid the overall height of the loading and unloading device being too high, and the height requirement for the working space is relatively low; when the bracket is lowered, the telescopic arms can be retracted to avoid the overall length of the loading and unloading device along the vehicle body length direction being too long, and the area requirement for the working space is relatively low, enabling the loading and unloading device to adapt to a changing working environment and effectively improving the applicability of the loading and unloading device.

[0018] 3. In the loading and unloading device for this vehicle, when the hydraulic cylinder 1 pushes the bracket to swing towards the rear of the vehicle to the limit position, the length of the telescopic arm can be adjusted. According to actual needs, the lifting hook can be further moved closer to or away from the loading platform, that is, the position for loading and unloading goods can be flexibly adjusted relative to the vehicle body, enabling the loading and unloading device to adapt to a changing working environment without the need to manually carry the goods to a suitable position, effectively improving the applicability of the loading and unloading device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall structural schematic diagram of the loading and unloading device for this vehicle.

[0020] Figure 2 is the side view of the loading and unloading device for this vehicle.

[0021] Figure 3 is Figure 2 the cross-sectional view along the A - A direction in

[0022] Figure 4 is Figure 3 the partial enlarged view at B in

[0023] Figure 5 is the schematic diagram of the lifting hook in the loading and unloading device for this vehicle.

[0024] In the figure, 1. Support; 1a. Cross bar; 1b. Side bar; 2. Hydraulic cylinder 1; 3. Lifting hook; 4. Bracket; 4a. Cross arm; 4b. Telescopic arm; 4b1. Rod 1; 4b2. Rod 2; 5. Mounting hole; 6. Hydraulic cylinder 2; 6a. Cylinder barrel; 6b. Piston rod; 7. Limiting part 1; 8. Limiting part 2; 9. Fixed block; 10. Line wheel; 11. Pulling rope; 12. Winding wheel; 13. Transition block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following are specific embodiments of the present invention in combination with the drawings, and the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0026] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art to which the present utility model pertains can make various modifications or supplements to the described specific embodiments or use similar ways for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

[0027] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 shown, the vehicle loading and unloading device is provided on the vehicle cargo platform, including a support 1, a first hydraulic cylinder 2, a hook 3 and a bracket 4.

[0028] The support 1 is fixedly provided on the vehicle cargo platform, and the support 1 includes a cross bar 1a and two side bars 1b respectively connected to both ends of the cross bar 1a. The side bars 1b extend along the length direction of the cargo platform, and the first hydraulic cylinder 2 and the first rod 4b1 on the same side are respectively hinged to the side bar 1b on this side. The cooperation of the cross bar 1a and the side bars 1b helps to improve the supporting force of the support 1. The first hydraulic cylinder 2 and the first rod 4b1 on the same side form two hinge points with the side bar 1b on this side, and the side bar 1b plays a guiding role for the two hinge points on its side, which helps to align the hinge points along the length direction of the cargo platform, so that the first hydraulic cylinder 2 and the first rod 4b1 swing or expand and contract in the same plane during work, avoiding additional stress caused by structural misalignment or uneven torque during work, reducing vibration or shaking during work, and effectively improving the structural stability and working reliability of the loading and unloading device.

[0029] The bracket 4 includes a cross arm 4a and two telescopic arms 4b. The telescopic arm 4b includes a first rod 4b1 and a second rod 4b2. The first rod 4b1 and the second rod 4b2 are slidably connected through a second hydraulic cylinder 6. The second hydraulic cylinder 6 includes a cylinder barrel 6a and a piston rod 6b. The cylinder barrel 6a is fixed in the mounting hole 5, and the piston rod 6b is fixedly connected to the second rod 4b2.

[0030] An installation hole 5 is formed along the length direction inside the first rod 4b1. The second hydraulic cylinder 6 is arranged in the installation hole 5. The second hydraulic cylinder 6 is fixedly connected through the cylinder barrel 6a and the installation hole 5, and is fixedly connected to the second rod 4b2 through the piston rod 6b. Personnel can remotely control the piston rod 6b to slide relative to the cylinder barrel 6a. The movement of the piston rod 6b in the installation hole 5 makes the second rod 4b2 approach or move away from the first rod 4b1, that is, makes the telescopic arm 4b extend or contract. The two first rods 4b1 are respectively hinged to one side of the support 1 close to the vehicle tail, and the two second rods 4b2 are respectively fixedly connected to both ends of the cross arm 4a. Both ends of the first hydraulic cylinder 2 are respectively hinged to the first rod 4b1 and one side of the support 1 close to the vehicle head.

[0031] The specific mounting hole 5 is a blind hole. The end face of the cylinder barrel 6a abuts against the bottom surface of the mounting hole 5, and the outer sidewall of the cylinder barrel 6a abuts against the inner sidewall of the mounting hole 5. The design of the blind hole enables the second hydraulic cylinder 6 to be completely embedded inside the first rod 4b1, making the overall structure of the loading and unloading device more compact and efficient. The bottom surface of the blind hole provides stable support for the second hydraulic cylinder 6, ensuring the stability of the loading and unloading device. When installing the second hydraulic cylinder 6 and the first rod 4b1, the bottom surface of the blind hole plays a positioning role for the installation position of the cylinder barrel 6a. The outer sidewall of the cylinder barrel 6a abuts against the inner sidewall of the mounting hole 5, which can effectively prevent external dust and impurities from entering and causing pollution.

[0032] The second rod 4b2 is cylindrical, and one end of the second rod 4b2 fixedly connected to the piston rod 6b can extend into the mounting hole 5. The second rod 4b2 is designed to be cylindrical, with a smoother sliding surface, which helps the second rod 4b2 to slide more smoothly relative to the first rod 4b1. At the same time, the second rod 4b2 is designed to be cylindrical, which helps to be more easily centered with the first rod 4b1, reducing the strict requirements for installation and alignment. The first rod 4b1 and the second rod 4b2 form a sliding plug-in structure with an inner and outer sleeve arrangement. While the structure is compact, the vibration frequency and amplitude during operation are small, effectively improving the structural stability and working reliability of the loading and unloading device.

[0033] The first limiting member 7 and the second limiting member 8 are provided on the side rod 1b. The first limiting member 7 and the second limiting member 8 are respectively located on both sides of the hinge point between the first rod 4b1 and the side rod 1b, and the top surfaces of the first limiting member 7 and the second limiting member 8 are both provided with inclined planes facing the first rod 4b1. The sidewalls of the first rod 4b1 facing the first limiting member 7 and the second limiting member 8 are both planes. The first limiting member 7 and the second limiting member 8 jointly limit the swing range of the bracket 4, and prevent the bracket 4 from falling and hitting the vehicle body and people when the first hydraulic cylinder 2 fails and gets out of control. When the first hydraulic cylinder 2 drives the first rod 4b1 to swing to the extreme position in the direction of the vehicle head, the sidewall of the first rod 4b1 facing the first limiting member 7 abuts against the top inclined plane of the first limiting member 7. When the first hydraulic cylinder 2 drives the first rod 4b1 to swing to the extreme position in the direction of the vehicle tail, the sidewall of the first rod 4b1 facing the second limiting member 8 abuts against the top inclined plane of the second limiting member 8. The abutment between the planes effectively improves the structural stability. At the same time, the heights of the first limiting member 7 and the second limiting member 8 can be reasonably set according to the actual situation.

[0034] The cross arm 4a is provided with a hook 3, a fixed block 9, a wire wheel 10, a pulling rope 11, a winding wheel 12 and a slider 14. The fixed block 9 and the winding wheel 12 are fixedly connected to the cross arm 4a. The slider 14 can slide along the length direction of the cross arm 4a, and the slider 14 is fixed to the wire wheel 10. The hook 3 is provided with a transition block 13, and the side wall of the transition block 13 is a smooth arc surface. One end of the pulling rope 11 is fixedly connected to the fixed block 9, and the other end sequentially bypasses the transition block 13 and the wire wheel 10 and is connected to the winding wheel 12 and is tensioned under the action of the winding wheel 12. The side wall of the transition block 13 being a smooth arc surface helps the pulling rope 11 to smoothly stretch and contract. By rotating the winding wheel 12, the length of the pulling rope 11 is adjusted, so as to adjust the height of the hook 3. The slider 14 drives the wire wheel 10 to slide along the length direction of the cross arm 4a, so that the hook 3 moves along the width direction of the vehicle body. That is, relative to the vehicle body, the position for loading and unloading goods can be flexibly adjusted, enabling the loading and unloading device to adapt to a variety of working environments and effectively improving the applicability of the loading and unloading device.

[0035] Specifically, the rotation of the winding wheel 12 can be controlled by a motor.

[0036] Specifically, a slide rail can be arranged along the length direction of the cross arm 4a to enable the slider 14 to slide in the slide rail.

[0037] During operation, the remote-controlled hydraulic cylinder 1 shortens, pulling the bracket 4 to swing towards the front of the vehicle. At the same time, the length of the telescopic arm 4b can be adjusted by the remote-controlled hydraulic cylinder 2, and the length of the pulling rope 11 can be adjusted through the wire wheel 10, so as to control the hook 3 to move to a suitable position for loading and unloading goods; the remote-controlled hydraulic cylinder 1 elongates, pushing the bracket 4 to swing towards the rear of the vehicle. At the same time, the length of the telescopic arm 4b can be adjusted by the remote-controlled hydraulic cylinder 2, and the length of the pulling rope 11 can be adjusted through the winding wheel 12, so as to control the hook 3 to move to a suitable position for loading and unloading goods.

[0038] At both ends of the cross arm 4a, telescopic arms 4b are respectively arranged. The double telescopic arms 4b support the cross arm 4a at the same time, which can not only more evenly share the bearing capacity of the hook 3, but also effectively prevent the hook 3 from driving the bracket 4 to shake under the influence of lateral force, effectively improving the structural stability and working reliability of the loading and unloading device. When the bracket 4 is lifted, the telescopic arms 4b can be retracted to avoid the overall height of the loading and unloading device being too high, and the height requirement for the working space is relatively low; when the bracket 4 is lowered, the telescopic arms 4b can be retracted to avoid the overall length of the loading and unloading device along the vehicle body being too long, and the area requirement for the working space is relatively low, enabling the loading and unloading device to adapt to a changing working environment and effectively improving the applicability of the loading and unloading device. When the hydraulic cylinder 1 pushes the bracket 4 to swing towards the rear of the vehicle to the limit position, the length of the telescopic arm 4b can be adjusted. According to actual needs, the hook 3 can be further moved closer to or away from the loading platform, that is, the position for loading and unloading goods can be flexibly adjusted relative to the vehicle body without manually moving the goods to a suitable position, enabling the loading and unloading device to adapt to a changing working environment and effectively improving the applicability of the loading and unloading device.

[0039] Although terms such as support 1, cross bar 1a, side bar 1b, hydraulic cylinder 1, hook 3, bracket 4, cross arm 4a, telescopic arm 4b, rod 4b1, rod 4b2, mounting hole 5, hydraulic cylinder 2, cylinder barrel 6a, piston rod 6b, limit member 1 7, limit member 2 8, fixed block 9, wire wheel 10, pull rope 11, reel 12, transition block 13 are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A vehicle loading and unloading device, comprising a support (1) placed on a vehicle cargo platform, a hydraulic cylinder (2) and a hook (3), characterized in that: The loading and unloading device also includes a bracket (4), the bracket (4) includes a cross arm (4a) and two telescopic arms (4b), the telescopic arms (4b) include a slidably connected rod 1 (4b1) and a rod 2 (4b2), the two rods 1 (4b1) are respectively hinged to the side of the support (1) close to the rear of the vehicle, the two rods 2 (4b2) are respectively fixed to the two ends of the cross arm (4a), the two ends of the hydraulic cylinder 1 (2) are respectively hinged to the rod 1 (4b1) and the side of the support (1) close to the front of the vehicle, and the cross arm (4a) is provided with a hook (3).

2. A vehicle loading and unloading device according to claim 1, characterized in that: A mounting hole (5) is provided in the rod one (4b1) along its length direction, and a hydraulic cylinder two (6) is provided in the mounting hole (5). The hydraulic cylinder two (6) comprises a cylinder barrel (6a) and a piston rod (6b). The cylinder barrel (6a) is fixed in the mounting hole (5), and the piston rod (6b) is fixedly connected to the rod two (4b2). The piston rod (6b) can move in the mounting hole (5) to make the rod two (4b2) approach or move away from the rod one (4b1).

3. A vehicle loading and unloading device according to claim 2, characterized in that: The mounting hole (5) is a blind hole, the end surface of the cylinder (6a) is tightly pressed against the bottom surface of the mounting hole (5), and the outer side wall of the cylinder (6a) is tightly pressed against the inner side wall of the mounting hole (5).

4. A vehicle loading and unloading device according to claim 2 or 3, characterized in that: One end of the second rod (4b2) that is fixedly connected to the piston rod (6b) can extend into the mounting hole (5).

5. A vehicle loading and unloading device according to claim 4, characterized in that: The support (1) comprises a crossbar (1a) and two sidebars (1b) respectively connected to the two ends of the crossbar (1a); the sidebars (1b) extend along the length direction of the cargo platform, and the hydraulic cylinder 1 (2) and rod 1 (4b1) on the same side are respectively hinged to the sidebars (1b) on that side.

6. A vehicle loading and unloading device according to claim 5, characterized in that: The side bar (1b) is provided with a limiting member 1 (7) and a limiting member 2 (8), the limiting member 1 (7) and the limiting member 2 (8) are respectively located on both sides of the hinge point between the bar 1 (4b1) and the side bar (1b), and the tops of the limiting member 1 (7) and the limiting member 2 (8) are both provided with inclined planes facing the bar 1 (4b1), and the side walls of the bar 1 (4b1) facing the limiting member 1 (7) and the limiting member 2 (8) are both planes.

7. A vehicle loading and unloading device according to claim 6, characterized in that: The rod 2 (4b2) is cylindrical.

8. A vehicle loading and unloading device according to claim 7, characterized in that: The cross arm (4a) is provided with a fixed block (9), a wire wheel (10) and a reel (12); the hook (3) is provided with a transition block (13); the side wall of the transition block (13) is a smooth arc surface; the fixed block (9) is fixedly connected with a pull rope (11); the other end of the pull rope (11) passes around the transition block (13) and the wire wheel (10) in sequence, and the other end is connected to the reel (12) and is tensioned under the action of the reel (12).

9. A vehicle loading and unloading device according to claim 8, characterized in that: The cross arm (4a) is also provided with a slider (14), the slider (14) can slide along the length direction of the cross arm (4a), and the slider (14) is fixed to the wire wheel (10).

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