Hydraulic tailboard device of high-mobility freight vehicle

Abstract

The utility model discloses a hydraulic tail plate device of a high-mobility freight vehicle. The hydraulic tail plate device comprises a base, a mounting frame, a sliding assembly, a bearing plate and a supporting assembly. Through cooperation of an adjusting rod, a guide block, a transmission arm and a locking pin, rapid disassembly and assembly of the bearing plate and the mounting frame are achieved; the auxiliary mechanism utilizes air chamber linkage to enhance lifting stability, a limiting cylinder, a telescopic column and a buffer part disperse pressure, and anti-skid protrusions increase friction force. The operation process can be simplified, energy consumption is reduced, loading and unloading efficiency and equipment stability are improved, and the method is particularly suitable for high-maneuverability cargo loading and unloading scenes.

Description

Technical Field

[0001] This utility model relates to the field of automobile loading and unloading equipment technology, and in particular to a hydraulic tailgate device for high-mobility freight trucks. Background Technology

[0002] Freight trucks are specialized vehicles used for transporting goods, widely applied in logistics, construction, retail, and other fields. Depending on the specific needs, freight trucks are equipped with various auxiliary devices to improve loading and unloading efficiency and ease of operation. Hydraulic tailgates, as an important auxiliary device, can significantly improve the efficiency of cargo loading and unloading, especially in scenarios requiring frequent loading and unloading or handling of heavy objects. Hydraulic tailgates are typically installed at the rear of the vehicle and achieve their lifting function through a hydraulic system; their structural design directly affects their stability and safety. However, in actual use, some hydraulic tailgates suffer from insufficient load-bearing capacity and poor maneuverability, impacting overall operational efficiency.

[0003] Chinese patent CN20222156789U discloses a hydraulic tailgate device for freight trucks, including a base plate, hydraulic cylinders, a support frame, and a control system. The base plate is connected to the vehicle body via hinges, the hydraulic cylinders drive the base plate to rise and fall, and the support frame is located below the base plate to provide additional support. This device improves the load-bearing capacity and stability of the tailgate by optimizing the layout of the hydraulic cylinders and the design of the support frame, while simplifying the installation process. Furthermore, the control system adopts a modular design, facilitating maintenance and upgrades, further improving the reliability of the equipment.

[0004] However, during the process of conceiving and implementing the aforementioned application, the inventors discovered that, in practical use, the disclosed solution has certain limitations in energy utilization efficiency because the power source of the hydraulic system relies on the vehicle's own engine or independent battery pack, which may increase the vehicle's overall energy consumption. Furthermore, while the support frame design improves load-bearing capacity, its deployment and retraction process is somewhat complex in high-mobility scenarios, potentially impacting operational efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide a hydraulic tailgate device for high-mobility freight vehicles, which solves the problems mentioned in the background art.

[0006] This utility model is implemented as follows: a hydraulic tailgate device for a high-mobility freight truck includes a base, a mounting frame fixedly connected to one side of the base, a sliding assembly inside the mounting frame, a bearing plate on the top of the sliding assembly, and a support assembly at the bottom of the bearing plate. The high-mobility freight truck hydraulic tailgate device also includes:

[0007] The adjusting rod has its upper end rotatably connected to the bearing plate and extends to the outside of the bearing plate, and its lower end is provided with a guide block. The guide block is embedded in the sliding sleeve, and the sliding sleeve is located in the cavity opened in the inner wall of the mounting frame.

[0008] Two sets of transmission arms are symmetrically arranged on the outer wall of the sliding sleeve. One end of each set of transmission arms is hinged to a first connecting rod. One end of the first connecting rod is hinged to a push block. Two sets of locking pins are symmetrically arranged on the outer wall of the push block. An elastic element is sleeved on the locking pin. The elastic element is located between the push block and the inner wall of the cavity.

[0009] The inner wall of the mounting frame is provided with positioning holes that allow the locking pin to be inserted.

[0010] Optionally, the outer wall of the bearing plate is provided with several anti-slip protrusions, and the top of the base is symmetrically provided with two sets of limiting cylinders. Each set of limiting cylinders is provided with a telescopic column at the top. The upper end of the telescopic column is fixedly connected to the bottom of the bearing plate, and the lower end of the telescopic column is located inside the limiting cylinder and connected to a limiting block. The bottom of the limiting block is provided with a buffer.

[0011] Optionally, it also includes an auxiliary mechanism disposed between the base and the support plate, the auxiliary mechanism comprising:

[0012] Two sets of guide rail grooves are symmetrically opened in the top of the base. Each set of guide rail grooves is slidably connected to a sliding block. The upper end of the sliding block is movably connected to the bottom of the bearing plate through a second connecting rod. A drive rod is connected to one side of the inner wall of the sliding block. A first air chamber is provided on one side of the drive rod. A first piston body is slidably connected in the first air chamber. One end of the drive rod extends into the first air chamber and connects to the first piston body. One end of the first air chamber is connected to a first air passage.

[0013] Optionally, the lower end of the first air passage passes through the mounting frame and the sliding sleeve and is connected to the second air passage. One end of the second air passage is connected to the second air chamber, which is located inside the base. The second air chamber is provided with a reset component. The top of the reset component is connected to the second piston body. The upper end of the second piston body is connected to a support rod. The upper end of the support rod passes through the mounting frame and is inserted into the bottom of the bearing plate.

[0014] Optionally, the upper end face of the second airway is fitted with the lower end face of the first airway, and two sets of sealing rings are provided inside the fitting area, with sealing material filling the interior of the two sets of sealing rings.

[0015] Optionally, the sliding sleeve and the adjusting rod are rotatably connected to the mounting frame and the bearing plate respectively via rolling bearings, and the upper end of the adjusting rod is provided with an operating handle.

[0016] Optionally, the guide rail groove has a T-shaped cross-section, and the two ends of the second connecting rod are hinged to the bearing plate and the sliding block, respectively.

[0017] Optionally, sealing gaskets are provided between the first piston body and the first air chamber, and between the second piston body and the second air chamber.

[0018] Optionally, the sealing ring has a U-shaped cross-section, and the two sets of sealing rings are fixedly connected to the inner walls of the first air passage and the second air passage, respectively.

[0019] Optionally, the cross-section of the anti-slip protrusion is trapezoidal.

[0020] The beneficial effects of this invention are as follows: By rotating the adjusting rod, the guide block drives the sliding sleeve to rotate, causing the transmission arm to pull the first connecting rod, which in turn moves the push block, pushing the locking pin out of the positioning hole, thereby separating the support plate from the mounting frame. During installation, after repeating the above steps, the support plate is aligned with the mounting frame and the applied force is released. The elastic element pushes the locking pin back to its original position, allowing it to be inserted into the positioning hole for fixation. This design requires no additional power source, simplifies the disassembly and assembly process, reduces energy consumption, and improves operational efficiency. In addition, the auxiliary mechanism, through pneumatic transmission, utilizes the linkage between the first and second air chambers to further enhance the smoothness of the support plate's lifting and lowering, reducing swaying caused by changes in external load, thereby improving the overall structural stability and safety.

[0021] The support assembly design incorporates limiting cylinders, telescopic columns, and buffer components, effectively dispersing pressure on the load-bearing plate, preventing localized stress concentration, and extending the equipment's service life. The anti-slip protrusions increase friction between the goods and the load-bearing plate, preventing goods from slipping during transport and further enhancing the safety of loading and unloading operations.

[0022] Through the above technical solution, this utility model solves the shortcomings of existing hydraulic tailgates in terms of energy utilization efficiency and ease of operation, and is particularly suitable for cargo loading and unloading operations in scenarios with high mobility requirements, significantly improving the overall performance of the equipment. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model, showing the connection relationship between the base, mounting frame, bearing plate, sliding sleeve, and adjusting rod.

[0024] Figure 2 This is a partial enlarged view of the locking mechanism of this utility model, which shows in detail the cooperative structure of the transmission arm, the first connecting rod, the push block, the locking pin and the elastic element.

[0025] Figure 3 This is a schematic diagram of the air circuit connection of the auxiliary mechanism of this utility model, showing the connection method of the first air chamber, the second air chamber, the first air passage and the second air passage and their linkage relationship with the support plate.

[0026] The reference numerals in the attached drawings are as follows: 1. Base; 2. Mounting frame; 3. Bearing plate; 4. Sliding sleeve; 5. Adjusting rod; 6. Guide block; 7. Transmission arm; 8. First connecting rod; 9. Push block; 10. Locking pin; 11. Elastic element; 12. Positioning hole; 13. Anti-slip protrusion; 14. Limiting cylinder; 15. Telescopic column; 16. Buffer element; 17. Guide rail groove; 18. Sliding block; 19. Second connecting rod; 20. Drive rod; 21. First air chamber; 22. First piston body; 23. First air passage; 24. Second air passage; 25. Second air chamber; 26. Reset element; 27. Second piston body; 28. Support rod. Detailed Implementation

[0027] This utility model provides a hydraulic tailgate device for a high-mobility freight vehicle, the structure of which is as follows: Figures 1 to 3 As shown, the system includes a base 1, mounting frame 2, bearing plate 3, sliding sleeve 4, adjusting rod 5, guide block 6, transmission arm 7, first connecting rod 8, push block 9, locking pin 10, elastic element 11, positioning hole 12, anti-slip protrusion 13, limiting cylinder 14, telescopic column 15, buffer element 16, guide rail groove 17, sliding block 18, second connecting rod 19, drive rod 20, first air chamber 21, first piston body 22, first air passage 23, second air passage 24, second air chamber 25, reset element 26, second piston body 27, and support rod 28. The specific connection and positional relationships of each component are described in detail below with reference to the accompanying drawings.

[0028] The base 1 is the main support part of the entire device. A mounting frame 2 is fixedly connected to one side of the base 1. A sliding assembly is provided inside the mounting frame 2 for the lifting and lowering movement of the support plate 3. The support plate 3 is located at the top of the mounting frame 2, and a support assembly is provided at its bottom to distribute pressure and enhance stability. The sliding sleeve 4 is located in a cavity opened in the inner wall of the mounting frame 2. The upper end of the adjusting rod 5 is rotatably connected to the support plate 3 through a rolling bearing, and the lower end of the adjusting rod 5 is provided with a guide block 6, which is embedded in the sliding sleeve 4. The upper end of the adjusting rod 5 is also provided with an operating handle for easy manual operation. Two sets of transmission arms 7 are symmetrically arranged on the outer wall of the sliding sleeve 4. One end of each set of transmission arms 7 is hinged to a first connecting rod 8, and the other end of the first connecting rod 8 is hinged to a push block 9. Two sets of locking pins 10 are symmetrically arranged on the outer wall of the push block 9. An elastic element 11 is sleeved on the locking pin 10, and the elastic element 11 is located between the push block 9 and the inner wall of the cavity. The inner wall of the mounting frame 2 is provided with a positioning hole 12 that allows the locking pin 10 to be inserted. When the locking pin 10 is inserted into the positioning hole 12, the bearing plate 3 is fixed to the mounting frame 2.

[0029] The outer wall of the support plate 3 is provided with several anti-slip protrusions 13. The cross-section of the anti-slip protrusions 13 is trapezoidal, which can increase the friction of the goods on the support plate 3 and prevent the goods from slipping during transportation. The top of the base 1 is symmetrically provided with two sets of limiting cylinders 14. The top of each set of limiting cylinders 14 is provided with a telescopic column 15. The upper end of the telescopic column 15 is fixedly connected to the bottom of the support plate 3, and the lower end is located inside the limiting cylinder 14 and connected to a limiting block. The bottom of the limiting block is provided with a buffer 16. The buffer 16 can effectively absorb the impact force generated when the support plate 3 descends and avoid local stress concentration.

[0030] An auxiliary mechanism is also provided between the base 1 and the support plate 3. The auxiliary mechanism includes two sets of guide rail grooves 17 symmetrically opened in the top of the base 1. Each set of guide rail grooves 17 has a sliding block 18 slidably connected in it. The upper end of the sliding block 18 is movably connected to the bottom of the support plate 3 through a second connecting rod 19. The two ends of the second connecting rod 19 are respectively hinged to the support plate 3 and the sliding block 18. A drive rod 20 is connected to one side of the inner wall of the sliding block 18. A first air chamber 21 is provided on one side of the drive rod 20. A first piston body 22 is slidably connected in the first air chamber 21. One end of the drive rod 20 extends into the first air chamber 21 and is connected to the first piston body 22. One end of the first air chamber 21 is connected to a first air passage 23. The lower end of the first air passage 23 passes through the mounting frame 2 and the sliding sleeve 4 in sequence and is connected to a second air passage 24. One end of the second air passage 24 is connected to a second air chamber 25, which is located in the base 1. The second air chamber 25 contains a reset component 26. A second piston body 27 is connected to the top of the reset component 26. A support rod 28 is connected to the upper end of the second piston body 27. The upper end of the support rod 28 passes through the mounting frame 2 and is inserted into the bottom of the support plate 3. The upper end of the second air passage 24 is in contact with the lower end of the first air passage 23. Two sets of sealing rings are provided inside the contact area, and the interior of the two sets of sealing rings is filled with sealing material. The sealing rings have a U-shaped cross-section, and the two sets of sealing rings are fixedly connected to the inner walls of the first air passage 23 and the second air passage 24, respectively.

[0031] In actual operation, firstly, the adjusting rod 5 is rotated by operating the handle. The adjusting rod 5 drives the guide block 6 to rotate within the sliding sleeve 4, which in turn rotates and pushes the transmission arm 7 to move. The transmission arm 7 pulls the first connecting rod 8 to move, which in turn drives the push block 9 to move outward. The push block 9 pushes the locking pin 10 to compress the elastic element 11 and move it outward out of the positioning hole 12, thereby separating the bearing plate 3 from the mounting frame 2. During installation, the above steps are repeated until the bearing plate 3 is aligned with the mounting frame 2 and the applied force is released. The elastic element 11 pushes the locking pin 10 to reset and insert it into the positioning hole 12 to complete the fixation. This process requires no additional power source, simplifying the disassembly and assembly steps.

[0032] The auxiliary mechanism works as follows: When the support plate 3 needs to be raised or lowered, changes in the external load cause the first piston 22 in the first air chamber 21 to shift. The first piston 22 drives the sliding block 18 to slide along the guide rail groove 17 via the drive rod 20. The sliding block 18 pushes the support plate 3 to rise or fall via the second connecting rod 19. At the same time, the gas in the first air chamber 21 enters the second air passage 24 through the first air passage 23 and finally enters the second air chamber 25. The second piston 27 in the second air chamber 25 moves upward under gas pressure, thereby driving the support rod 28 to lift the support plate 3, ensuring the smoothness of the lifting and lowering of the support plate 3. When the external load decreases, the reset member 26 pushes the second piston 27 to reset, and the gas flows back to the first air chamber 21, forming a linkage effect. Sealing gaskets are provided between the first piston 22 and the first air chamber 21, and between the second piston 27 and the second air chamber 25 to ensure airtightness.

[0033] Furthermore, the guide rail groove 17 has a T-shaped cross-section, providing high stability for the sliding block 18 when sliding within it, thus preventing swaying caused by changes in external load. The anti-slip protrusions 13 further enhance the friction on the surface of the bearing plate 3, reducing the risk of goods slipping during loading and unloading. The limiting cylinder 14, telescopic column 15, and buffer 16 work together to effectively disperse the pressure on the bearing plate 3, preventing localized stress concentration and extending the equipment's service life.

[0034] As can be seen from the above specific embodiments, the hydraulic tailgate device for high-mobility freight vehicles of this utility model not only realizes the convenient disassembly and assembly of the bearing plate 3, but also improves the stability of the lifting and lowering of the bearing plate 3 through the pneumatic transmission design of the auxiliary mechanism, reduces the shaking caused by changes in external load, and thus improves the stability and safety of the overall structure.

[0035] To enable those skilled in the art to fully understand and implement this utility model, the specific implementation principle of this utility model is further explained below in conjunction with a specific application scenario.

[0036] In the loading and unloading operations of freight trucks at a logistics center, a hydraulic tailgate device is installed at the rear of a heavy-duty freight truck for frequently loading and unloading large and heavy goods. Operators need to use this device to lower the load-bearing platform to ground level so that forklifts can easily move the goods onto it, and finally lift the goods to a height level with the truck bed to complete the loading. The specific operating steps and their working principle are as follows:

[0037] First, when it is necessary to lower the support plate 3, the operator applies rotational force through the operating handle on the adjusting rod 5. The rotation of the adjusting rod 5 causes the guide block 6 at its lower end to rotate synchronously within the sliding sleeve 4, and the sliding sleeve 4 rotates accordingly. Two sets of transmission arms 7 are symmetrically arranged on the outer wall of the sliding sleeve 4. As the sliding sleeve 4 rotates, the transmission arms 7 are driven to unfold outward. The transmission arms 7 pull the first connecting rod 8 to move outward. The other end of the first connecting rod 8 is hinged to a push block 9, so the push block 9 also moves along with it. Two sets of locking pins 10 are symmetrically arranged on the outer wall of the push block 9. When the push block 9 moves outward, the locking pins 10 are pushed and compress the elastic element 11, and move out of the positioning hole 12 on the inner wall of the mounting frame 2. At this time, the fixed state between the support plate 3 and the mounting frame 2 is released, and the support plate 3 enters the lifting state.

[0038] Subsequently, the auxiliary mechanism begins to function. During the descent of the support plate 3, changes in the external load cause variations in the gas pressure within the first air chamber 21, resulting in displacement of the first piston 22 along the inner wall of the first air chamber 21. The first piston 22, via the drive rod 20, drives the sliding block 18 to slide along the guide rail groove 17. The sliding block 18, via the second connecting rod 19, propels the support plate 3 to descend smoothly. Simultaneously, the gas within the first air chamber 21 enters the second air passage 24 through the first air channel 23 and ultimately flows into the second air chamber 25. The increased gas pressure within the second air chamber 25 pushes the second piston 27 upward. The second piston 27, via the support rod 28, lifts the support plate 3, further ensuring a smooth and undisturbed descent of the support plate 3. This linkage mechanism effectively reduces the swaying of the support plate 3 caused by changes in the external load, improving the overall structural stability.

[0039] Once the support plate 3 is lowered to ground level, operators use a forklift to place goods onto its surface. The outer wall of the support plate 3 has several anti-slip protrusions 13, which have a trapezoidal cross-section. These protrusions significantly increase the friction between the goods and the support plate 3, preventing slippage or tipping during loading and unloading. Furthermore, the two sets of limiting cylinders 14 and telescopic columns 15 symmetrically arranged at the top of the base 1 work together to distribute the pressure on the support plate 3. When the support plate 3 bears a large load, the telescopic column 15 moves downwards, and its bottom buffer 16 absorbs the impact force, preventing localized stress concentration and extending the equipment's service life.

[0040] After loading the cargo, the operator rotates the adjusting rod 5 again via the operating handle, disengaging the locking pin 10 from the positioning hole 12, allowing the support plate 3 to enter a liftable state. At this time, the auxiliary mechanism reverses its operation: as the external load decreases, the gas pressure in the first air chamber 21 drops, the reset component 26 pushes the second piston body 27 to reset, and the gas flows back to the first air chamber 21, forming a closed-loop linkage effect. Under the action of the auxiliary mechanism, the support plate 3 rises smoothly until it is flush with the floor of the carriage. Subsequently, the operator aligns the support plate 3 with the mounting frame 2, releases the applied force, and the elastic component 11 pushes the locking pin 10 to reset and insert it into the positioning hole 12, completing the fixation of the support plate 3.

[0041] Throughout the loading and unloading process, the design of the guide rail groove 17 plays a crucial role. The guide rail groove 17 has a T-shaped cross-section, providing high stability for the sliding block 18 when sliding within it, preventing swaying caused by changes in external load. Furthermore, two sets of sealing rings are provided at the connection between the first air passage 23 and the second air passage 24. These sealing rings have a U-shaped cross-section and are filled with sealing material, ensuring the airtightness of the air passage and preventing gas leakage from affecting the pneumatic transmission effect.

[0042] As can be seen from the above specific application scenarios, the hydraulic tailgate device for high-mobility freight vehicles of this utility model not only realizes the convenient disassembly and assembly of the bearing plate 3, but also improves the stability of lifting and lowering the bearing plate 3 through the pneumatic transmission design of the auxiliary mechanism. At the same time, the synergistic effect of components such as the anti-slip protrusion 13, the limiting cylinder 14, the telescopic column 15, and the buffer 16 further enhances the safety and durability of the equipment, making it particularly suitable for cargo loading and unloading operations in scenarios requiring high mobility.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic tailgate device for a high-mobility freight vehicle, comprising: A base (1) is fixedly connected to one side of the base (1), and a sliding assembly is provided inside the mounting frame (2). A bearing plate (3) is provided on the top of the sliding assembly, and a support assembly is provided at the bottom of the bearing plate (3). The high-mobility freight truck hydraulic tailgate device further includes: Adjusting rod (5), the upper end of which is rotatably connected to the bearing plate (3) and extends to the outside of the bearing plate (3), and the lower end of which is provided with guide block (6), the guide block (6) is embedded in the sliding sleeve (4), and the sliding sleeve (4) is located in the cavity opened in the inner wall of the mounting frame (2); Two sets of transmission arms (7) are symmetrically arranged on the outer wall of the sliding sleeve (4). One end of each set of transmission arms (7) is hinged to a first connecting rod (8). One end of the first connecting rod (8) is hinged to a push block (9). Two sets of locking pins (10) are symmetrically arranged on the outer wall of the push block (9). An elastic element (11) is sleeved on the locking pin (10). The elastic element (11) is located between the push block (9) and the inner wall of the cavity. The inner wall of the mounting frame (2) is provided with a positioning hole (12) that allows the locking pin (10) to be inserted.

2. The hydraulic tailgate device for a high-mobility freight vehicle as described in claim 1, characterized in that, The outer wall of the bearing plate (3) is provided with several anti-slip protrusions (13). The cross section of the anti-slip protrusions (13) is trapezoidal. The top of the base (1) is symmetrically provided with two sets of limiting cylinders (14). The top of each set of limiting cylinders (14) is provided with a telescopic column (15). The upper end of the telescopic column (15) is fixedly connected to the bottom of the bearing plate (3). The lower end of the telescopic column (15) is located inside the limiting cylinder (14) and connected to a limiting block. The bottom of the limiting block is provided with a buffer (16).

3. The hydraulic tailgate device for a high-mobility freight vehicle as described in claim 1, characterized in that, It also includes an auxiliary mechanism disposed between the base (1) and the support plate (3), the auxiliary mechanism comprising: Two sets of guide rail grooves (17) are symmetrically opened in the top of the base (1). Each set of guide rail grooves (17) is slidably connected to a sliding block (18). The upper end of the sliding block (18) is movably connected to the bottom of the bearing plate (3) through a second connecting rod (19). A drive rod (20) is connected to the inner wall of one side of the sliding block (18). A first air chamber (21) is provided on one side of the drive rod (20). A first piston body (22) is slidably connected in the first air chamber (21). One end of the drive rod (20) extends into the first air chamber (21) and is connected to the first piston body (22). One end of the first air chamber (21) is connected to a first air passage (23).

4. The hydraulic tailgate device for a high-mobility freight vehicle as described in claim 3, characterized in that, The lower end of the first air passage (23) passes through the mounting frame (2) and the sliding sleeve (4) and is connected to the second air passage (24). One end of the second air passage (24) is connected to the second air chamber (25). The second air chamber (25) is located in the base (1). The second air chamber (25) is provided with a reset component (26). The top of the reset component (26) is connected to the second piston body (27). The upper end of the second piston body (27) is connected to the support rod (28). The upper end of the support rod (28) passes through the mounting frame (2) and is inserted into the bottom of the bearing plate (3).

5. A hydraulic tailgate device for a high-mobility freight vehicle as described in claim 4, characterized in that, The upper end face of the second airway (24) is in contact with the lower end face of the first airway (23). Two sets of sealing rings are provided inside the contact area. The interior of the two sets of sealing rings is filled with sealing material. The cross-section of the sealing ring is U-shaped. The two sets of sealing rings are fixedly connected to the inner walls of the first airway (23) and the second airway (24) respectively.

6. The hydraulic tailgate device for a high-mobility freight vehicle as described in claim 1, characterized in that, The sliding sleeve (4) and the adjusting rod (5) are rotatably connected to the mounting frame (2) and the bearing plate (3) respectively through rolling bearings. The upper end of the adjusting rod (5) is provided with an operating handle.

7. A hydraulic tailgate device for a high-mobility freight vehicle as described in claim 3, characterized in that, The guide rail groove (17) has a T-shaped cross section. The two ends of the second connecting rod (19) are hinged to the bearing plate (3) and the sliding block (18) respectively. Sealing gaskets are provided between the first piston body (22) and the first air chamber (21) and between the second piston body (27) and the second air chamber (25).

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