A lifting device for loading and unloading a pack saddle

Abstract

The application discloses a lifting device for loading and unloading goods of a piggyback vehicle, which comprises a bottom plate lifting device, a driving device and a supporting device. The bottom plate lifting device is connected to the bottom plate and is in transmission connection with the driving device. The supporting device can move up and down relative to the bottom plate in the height direction of the piggyback vehicle under the driving of the bottom plate lifting device. The supporting device comprises a supporting plate and two roller parts which are arranged on both sides of the supporting plate in the width direction of the piggyback vehicle. Each roller part comprises a containing seat and a roller body. The roller body is arranged in the containing seat. The top end surface of the containing seat is located in the same plane as the top end surface of the supporting plate or is lower than the top end surface of the supporting plate. The size of the roller part in the height direction is within the height range of the bottom plate lifting device.

Description

Technical Field

[0001] This invention relates to the field of railway equipment technology, specifically to a lifting device for loading and unloading cargo on a piggyback wagon. Background Technology

[0002] Piggyback transport is a convenient combined road and rail transport method. Specifically, after a truck or semi-trailer is loaded with goods, it is transferred at a railway station to a dedicated railway wagon for long-distance transport. Upon arrival at its destination, the truck leaves the wagon and continues its journey to its final destination.

[0003] Among them, the lifting device for loading and unloading cargo on a piggyback vehicle is the main device used in the piggyback transportation process. The existing lifting device for loading and unloading cargo on a piggyback vehicle includes a support base, on which a drive wheel assembly is installed and fixed.

[0004] However, this design increases the height of the lifting device for loading and unloading piggyback wagons, making it unable to meet the height requirements of its application environment. In actual installation, to accommodate the height of the lifting device, the structure of the rail sleepers needs to be altered. Grooves are carved into the sleepers, and the lifting device is placed within these grooves to reduce its height after installation. This increases rail laying costs and reduces laying efficiency.

[0005] In view of this, there is an urgent need to provide a technical solution that can reduce the cost of laying railway tracks and improve the efficiency of railway track laying. Summary of the Invention

[0006] One objective of this invention is to provide a new technical solution for a lifting device for loading and unloading cargo in a piggyback wagon. By improving the structure of the lifting device for loading and unloading cargo in a piggyback wagon, the cost of laying railway tracks can be reduced and the efficiency of laying railway tracks can be improved.

[0007] According to an embodiment of the present invention, a lifting device for loading and unloading cargo in a piggyback vehicle is provided. The vehicle includes a floor lifting device connected to the floor and driven by a drive device; and a support device that can move up and down relative to the floor in the height direction of the vehicle under the drive of the lifting device. The support device includes a support plate and two roller portions disposed on both sides of the support plate in the width direction of the vehicle. Each roller portion includes a receiving seat and a roller body. The roller body is disposed in the receiving seat. The top end face of the receiving seat is on the same plane as or lower than the top end face of the support plate. The dimensions of the roller portion in the height direction are within the height range of the lifting device.

[0008] By adopting the above solution, this embodiment of the invention arranges the first roller portion and the second roller portion on both sides of the support plate, and ensures that the top end face of the receiving seat does not exceed the top end face of the support plate, while the overall height of the roller portion is less than or equal to the height of the lifting device. This reduces the overall height of the support device in the height direction, thus meeting the height requirements of the application environment of the lifting device for loading and unloading cargo on piggyback wagons. It also prevents the overall height of the support device from increasing due to placing the roller portion on the top end face of the support plate, thereby avoiding damage to the sleeper structure when installing the lifting device for loading and unloading cargo on piggyback wagons to match the height requirements of the application environment, ensuring the efficiency of rail laying, and reducing the cost of rail laying.

[0009] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0010] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0011] Figure 1 This is a schematic diagram of the lifting device for loading and unloading cargo on a tandem vehicle in an embodiment of the present invention;

[0012] Figure 2 This is a schematic diagram of the triangular linkage of the lifting device for loading and unloading cargo on a tandem vehicle in an embodiment of the present invention;

[0013] Figure 3 This is a schematic diagram of the rocker arm of the lifting device for loading and unloading cargo on a tandem vehicle in an embodiment of the present invention;

[0014] Figure 4 This is a schematic diagram of the structure of the connecting block of the lifting device for loading and unloading cargo on a tandem vehicle in an embodiment of the present invention;

[0015] Figure 5 This is a schematic diagram of the structure of the base plate of the lifting device for loading and unloading cargo on a tandem vehicle in an embodiment of the present invention;

[0016] Figure 6 This is a schematic diagram of the support device of the lifting device for loading and unloading cargo on a tandem vehicle in the embodiment of the present invention when it is in its lowest working position.

[0017] Figure 7 This is a schematic diagram of the state of the support device of the lifting device for loading and unloading cargo on the pontoon in the embodiment of the present invention when it is in the middle working position;

[0018] Figure 8 This is a schematic diagram of the support device of the lifting device for loading and unloading cargo on a tandem vehicle in an embodiment of the present invention when it is in its highest working position.

[0019] Explanation of reference numerals in the attached figures:

[0020] 110. Base plate; 120. Fixed arm; 121. Slide groove; 122. First end face; 123. Second end face; 160. Fixed plate;

[0021] 200. Support device; 210. Support plate; 211. Roller section; 213. Roller body; 214. Receiving seat; 215. Drive section;

[0022] 300. Drive unit; 311. Cylinder block; 312. Moving end;

[0023] 400. Self-locking rod assembly; 410. Lifting device; 411. First support rod; 412. Second support rod; 421. Connecting block; 422. Rocker arm; 423. Clamping arm; 430. Triangular connecting rod; 431. First connecting hole; 432. Second connecting hole; 433. Third connecting hole;

[0024] 501, First pin; 502, Second pin; 503, Third pin; 504, Fourth pin. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] It should be noted that the left, right, front, back, up, and down contexts are all based on... Figure 1 From the perspective of [the context], the purpose is to clearly express the relative positions of each component, and should not be understood as a limitation on the technical solution.

[0027] According to one embodiment of this application, reference is made to... Figure 1 The lifting device for loading and unloading cargo in this embodiment is described. The transport vehicle includes a floor 110, a lifting device 410, and a support device 200. The support device 200 includes a support plate 210 and two roller portions 211. Each roller portion 211 includes a receiving seat 214 and a roller body 213.

[0028] Specifically, the support device 200 is connected to the base plate 110 via a lifting device 410. Driven by the lifting device 410, the support device 200 can move up and down relative to the base plate 110 in the height direction of the transport vehicle, switching between the highest and lowest positions. The receiving seats 214 of the two roller parts 211 are respectively located on the left and right sides of the support plate 210 in the width direction of the transport vehicle. The roller body 213 is disposed in the receiving seat 214, and a rotating shaft is disposed inside the receiving seat 214. The rotating shaft is arranged laterally in the receiving seat 214 and extends along the length direction of the transport vehicle. The roller body 213 is sleeved on the rotating shaft and can roll in the width direction.

[0029] The top end face of the receiving seat 214 is on the same plane as or lower than the top end face of the support plate 210, and a portion of the roller body 213 protrudes from the top end face of the support plate 210. The top end face of the receiving seat 214 is the upper end face in the height direction of the transport vehicle. Simultaneously, the height of the roller portion 211 is within the height range of the lifting device 410. The lifting device 410 has its minimum height when the support device 200 is in its lowest position. The height of the roller portion 211 is less than or equal to the minimum height of the lifting device 410.

[0030] In actual use, the overall height of the transport vehicle is the sum of the height of the support device 200, the height of the floor 210, and the height of the lifting device 410. In the prior art, the rollers are positioned on the support device 200 in the height direction, which increases the overall height of the transport vehicle.

[0031] According to an embodiment of the present invention, the lifting device for loading and unloading cargo in a piggyback wagon has two roller portions 211 disposed on both sides of the support plate 210. The top end face of the receiving seat 214 does not exceed the top end face of the support plate 210, while the overall height of the roller portion 211 is less than or equal to the height of the lifting device 410. This avoids setting the roller portion 211 on the top end face of the support plate 210, which would increase the overall height of the transport vehicle. The height direction thus meets the height requirements of the application environment of the lifting device for loading and unloading cargo in a piggyback wagon. This prevents damage to the sleeper structure of the rails in order to match the height requirements of the application environment, ensures the laying efficiency of the rails, and reduces the laying cost of the rails.

[0032] In some embodiments, such as Figure 1 As shown, at least one roller portion 211 also includes a drive portion 215, which is fixed to the side wall portion of the receiving seat 214. The side wall portion is the side surface of the receiving seat 214 in the direction parallel to the base plate 110. In this way, it can prevent the drive portion 215 from being fixed to the receiving seat 214 in the height direction, which would cause the overall height of the roller portion 211 to increase, thereby avoiding the drive portion 215 from affecting the height of the transport vehicle.

[0033] like Figure 1 As shown, either the roller body 213 of one roller section 211 is connected to the drive section 215 for transmission, or both roller bodies 213 of the two roller sections 211 are connected to the drive section 215 for transmission.

[0034] In some embodiments, see Figure 1 A notch is provided on the rear side of the support plate 210 to facilitate the inspection and maintenance of the components on the underside of the support plate 210 of the lifting device for loading and unloading cargo on the piggyback vehicle.

[0035] Optionally, two roller portions 211 are disposed on the side of the support plate 210 away from the notch, so as to improve the support strength of the support plate 210 for the roller portions 211.

[0036] In some embodiments, reference Figure 1 The loading and unloading lifting device for the piggyback wagon includes a drive unit 300 and a self-locking lever assembly 400. For example, the drive unit 300 is a hydraulic cylinder, positioned in a nearly horizontal direction. The hydraulic cylinder includes a cylinder body 311 and a piston rod. The piston rod can extend or retract from the cylinder body 311. The piston rod can move forward and backward in a nearly horizontal direction.

[0037] Specifically, such as Figure 1 as well as Figure 6-8 As shown, Figures 6-8 This is a schematic diagram showing the support device 200 rising from its lowest position to its highest position. For ease of understanding, [the following is a simplified explanation]. Figures 6-8 Some components are concealed in the accompanying drawings to make them clearer. The hydraulic cylinder is connected to the lifting device 410 via the self-locking rod assembly 400, which drives the lifting device 410 to move horizontally, thereby driving the support device 200 to move vertically.

[0038] See Figures 6-8 The self-locking lever assembly 400 rotates along the first direction until it is in contact with the base plate 110, thus forming a self-locking state. The first direction is the direction of rotation from the rear side to the front side of the base plate 110.

[0039] When the self-locking lever assembly 400 is in the self-locking state, see Figure 8 The self-locking lever assembly 400 is attached to the base plate 110. Since the base plate 110 is horizontal, when the self-locking lever assembly 400 rotates to a horizontal position, the support device 200 rises to its highest position. The weight of the support device 200 is perpendicular to the self-locking lever assembly 400, preventing it from rotating. The self-locking lever assembly 400 remains in a self-locked state. At this time, when the hydraulic cylinder no longer applies driving force to the self-locking lever assembly 400, the self-locking lever assembly 400 cannot rotate on its own, thus preventing the support device 200 from falling back when the hydraulic cylinder no longer applies driving force to the self-locking lever assembly 400.

[0040] When the hydraulic cylinder drives the support device 200 to move to the highest position, if the hydraulic cylinder malfunctions and stops working, or if the hydraulic cylinder leaks oil and there is no pressure difference on both sides of the hydraulic rod, the support device 200 will not fall back under the action of the self-locking rod 400, but will always remain in the highest position.

[0041] In some specific embodiments, see Figure 1The lifting device 410 includes a first support rod 411 and a second support rod 412. A support plate 210 is provided at the top of the first support rod 411 and the second support rod 412 in the height direction. The first support rod 411 and the second support rod 412 are straight three-hole connecting rods. The first support rod 411 and the second support rod 412 are pivotally connected at the middle of their length direction to form an X-shaped structure. The first support rod 411 and the second support rod 412 can move horizontally under the drive of the self-locking rod assembly 400. Because of their X-shaped structure, the horizontal movement can be converted into vertical extension and contraction, thereby moving the support plate 210 between the highest and lowest working positions.

[0042] In some specific embodiments, such as Figure 2 , Figure 3 as well as Figures 6-8 As shown, the self-locking lever assembly 400 includes a rocker arm 422 and a triangular connecting rod 430 that are connected to each other.

[0043] Specifically, a fixing plate 160 is set perpendicular to the base plate 110, and one end of the rocker arm 422 is pivotally connected to the fixing plate 160 through a first pin 501.

[0044] See Figure 3 as well as Figures 5-8 , Figure 3 In one embodiment of the rocker arm structure, the end of the rocker arm 422 that is pivotally connected to the fixing plate 160 has two clamping arms 423, and the fixing plate 160 is embedded in the two clamping arms 423. A first pin 501 extends along the width direction of the base plate 110 and passes through the fixing plate 160 and the two clamping arms 423, so that the rocker arm 422 can swing forward and backward along the length direction of the base plate 110. The other end of the rocker arm 422 is pivotally connected to a triangular connecting rod 430 via a third pin 503.

[0045] See Figure 2 The triangular connecting rod 430 has a first connecting hole 431, a second connecting hole 432, and a third connecting hole 433. The lines connecting the centers of the first connecting hole 431, the second connecting hole 432, and the third connecting hole 433 form a triangle. The free end 312 of the piston rod is pivotally connected to the first connecting hole 431 via a fourth pin 504. The second connecting hole 432 is pivotally connected to the lifting device 410 via a second pin 502. The third pin 503 is disposed within the third connecting hole 433.

[0046] When the self-locking lever assembly 400 is in the self-locking state, both the triangular connecting rod 430 and the rocker arm 422 rotate to fit against the base plate 110. By setting the triangular connecting rod 430, the rocker arm 422 can be driven to rotate, and the mechanical strength of the self-locking lever assembly 400 can be increased.

[0047] When the self-locking lever assembly 400 is in the self-locking state, see Figure 8The end of the triangular connecting rod 430 that is pivotally connected to the piston rod, i.e., the fourth pin 504, is located above the rocker arm 422 in the height direction. The position where the rocker arm 422 is pivotally connected to the base plate 110, i.e., the first pin 501 is located between the second pin 502 and the third pin 503.

[0048] When the hydraulic cylinder malfunctions and no longer applies driving force to the triangular link 430, the first support rod 411 drives the second pin 502 under the gravity of the support device 200, causing it to tend to move horizontally. However, at this time, the base plate 110 applies a pulling force to the triangular link 430 through the rocker arm 422 to prevent it from moving horizontally under the action of the first support rod 411, thereby locking the position of the lifting device 410 and preventing the support device 200 from falling back.

[0049] In some specific embodiments, to achieve horizontal movement of the lifting device 410, see [reference needed]. Figure 1 as well as Figures 6-8 The base plate 110 is provided with a fixed arm 120 perpendicular to the base plate 110. The fixed arm 120 has a sliding groove 121 extending in the horizontal direction. The triangular connecting rod 430 and the lifting device 410 are pivotally connected by a second pin 502, and the second pin 502 is slidably connected to the sliding groove 121.

[0050] When the self-locking lever assembly 400 is in the self-locking state, the line connecting the first pin 501, the second pin 502 and the third pin 503 is parallel to the base plate 110.

[0051] Specifically, two fixing arms 120 are provided perpendicular to the base plate 110, and the two fixing arms 120 are arranged at intervals relative to each other and extend along the front and rear directions of the base plate 110, respectively. The sliding grooves 121 all extend along the front and rear directions of the base plate 110. The sliding grooves 121 have a first end face 122 and a second end face 123, and the first end face 122 is located in front of the second end face 123.

[0052] When the support device 200 is in the highest position, the second pin 502 and the first end face 122 form a stop engagement; when the support device 200 is in the lowest position, the second pin 502 and the second end face 123 form a stop engagement.

[0053] In a specific example, see Figure 1 as well as Figures 6-8 The cylinder body 311 of the hydraulic cylinder is pivotally connected to the rear side of the fixed arm 120 and can swing up and down along the height direction. The moving end 312 of the piston rod is pivotally connected to the triangular connecting rod.

[0054] In some embodiments, the second pin 502 is provided with a first support wheel, which contacts the base plate 110; and / or the end of the first support rod 411 that contacts the support plate 210 is also provided with a second support wheel. When the first support rod 210 moves horizontally under the drive of the triangular connecting rod 430, the first support wheel and the second support wheel form a rolling connection with the corresponding base plate 110 and support plate 210 to reduce the friction between the first support rod 411 and the base plate 110 and support plate 210.

[0055] In one specific embodiment, see Figure 4 The lifting device for loading and unloading cargo on a piggyback vehicle includes two symmetrically arranged self-locking rod groups 400. The two self-locking rod groups 400 are connected by a connecting block 421. The driving device 300 drives the connecting block and simultaneously drives the two self-locking rod groups 400.

[0056] To maintain consistent movement, the structural strength and stability of the lifting device for loading and unloading cargo on the piggyback vehicle are increased. For example, the structure of the connecting block 421 is adapted to the triangular connecting rod 430. The connecting block 421 can be V-shaped, and it has three holes, the positions of which correspond to the positions of the first connecting hole 431, the second connecting hole 432, and the third connecting hole 433, respectively. Specifically, the two triangular connecting rods 430 are located on the left and right sides of the connecting block 421, and the corresponding holes of the triangular connecting rods 430 and the connecting block 421 are connected by a connecting shaft. The driving device 300 is pivotally connected to the connecting shaft between the triangular connecting rods 430 and the connecting block 421, thereby driving the connecting block 421 through the connecting shaft and simultaneously driving the triangular connecting rods 430, which in turn drives the two self-locking rod assemblies 400 to move.

[0057] The following describes the specific working process of the lifting device used for loading and unloading cargo on a piggyback vehicle.

[0058] See Figure 1 as well as Figure 6 as well as Figure 7 During the lifting of the support device 200, the piston rod extends forward from the cylinder 311, thereby pushing the triangular connecting rod 430 to move via the fourth pin 504. The third pin 503, pivotally connected to the rocker arm 422 and the triangular connecting rod 430, rotates around the first pin 501 from the rear side of the base plate 110 towards the front side under the action of the triangular connecting rod 430. Simultaneously, the second pin 502, driven by the triangular connecting rod 430, slides along the slide groove 121 from the second end face 123 towards the first end face 122, thereby causing the first support rod 411 to move horizontally. This causes the first support rod 411 and the second support to extend in the height direction, thus lifting the support device 200.

[0059] See Figure 7 and Figure 8As the piston rod continues to move forward, the rocker arm 422, pushed by the triangular connecting rod 430, continues to rotate around the first pin 501. The third pin 503, after passing the highest position from the rear side of the first pin 501, gradually descends and rotates to the front side of the first pin 501. Until the support device 200 is raised to the highest position, the rocker arm 422 and the triangular connecting rod 430 also come into contact with the base plate 110 and form a limiting engagement.

[0060] At this time, the rocker arm 422 is roughly horizontally attached to the base plate 110 and is roughly on the same extension line as the first slide groove 121. When the hydraulic cylinder malfunctions, the first support rod 411, under the action of the support device 200, applies a pulling force to the triangular connecting rod 430 toward the second end face 123 of the first slide groove 121, and applies a horizontal backward pulling force to the rocker arm 422 through the triangular connecting rod 430. However, since the rocker arm 422 is connected to the base plate 110 through the fixing plate 160, the triangular connecting rod 430 cannot move backward. In this way, the transmission assembly 400 can form a self-locking mechanism, thereby preventing the support device 200 from falling back when the hydraulic cylinder malfunctions.

[0061] Conversely, as the base plate 110 falls back, the hydraulic rod retracts into the cylinder 311, thereby applying a backward pulling force to the triangular connecting rod 430. Driven by the triangular connecting rod 430, the rocker arm 422 and the triangular connecting rod 430 will first rotate in opposite directions, and then drive the support device 200 to fall back through the first support rod 411.

[0062] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A lifting device for loading and unloading cargo on a piggyback vehicle, characterized in that, include: Base plate (110); A lifting device (410), the lifting device (410) being connected to the base plate (110) and being drive-connected to the drive device (300); and The support device (200) is able to move up and down relative to the base plate (110) in the height direction of the transport vehicle under the drive of the lifting device (410); The support device (200) includes a support plate (210) and two roller portions (211) disposed on both sides of the support plate (210) in the width direction of the transport vehicle. Each roller unit (211) includes a receiving seat (214) and a roller body (213). At least one roller unit (211) also includes a driving unit (215). The roller body (213) is connected to the driving unit (215) in a transmission manner. The roller body (213) is disposed in the receiving seat (214). A rotating shaft is disposed in the receiving seat (214). The rotating shaft is arranged laterally in the receiving seat (214) and extends along the length direction of the transport vehicle. The roller body (213) is sleeved on the rotating shaft and can roll along the width direction. The receiving seats (214) are respectively disposed on the left and right sides of the support plate (210) in the width direction of the transport vehicle. The top end face of the receiving seats (214) is located on the same plane as the top end face of the support plate (210) or is lower than the top end face of the support plate (210). The dimensions of the roller portion (211) in the height direction are within the height range of the lifting device (410). Also includes: Drive unit (300); as well as The self-locking rod assembly (400) is connected to the lifting device (410) via the self-locking rod assembly (400) to drive the support device (200) to move in the height direction; When the support device (200) is raised to the highest position, the self-locking rod assembly (400) rotates along the first direction to fit against the base plate (110) to form a self-locking state; The self-locking lever assembly (400) includes a rocker arm (422) and a triangular connecting rod (430) connected to each other. One end of the rocker arm (422) is pivotally connected to the base plate (110), one end of the triangular connecting rod (430) is drive-connected to the drive device (300), and the other end of the triangular connecting rod (430) is drive-connected to the lifting device (410). When the self-locking lever assembly (400) is in a self-locking state, both the triangular connecting rod (430) and the rocker arm (422) rotate to fit against the base plate (110). When the self-locking lever assembly (400) is in a self-locking state, the end of the triangular connecting rod (430) pivotally connected to the drive device (300) is located above the rocker arm (422) in the height direction, and the position where the rocker arm (422) is pivotally connected to the base plate (110) is located between the two ends of the part of the triangular connecting rod (430) that fits against the base plate (110).

2. The lifting device for loading and unloading cargo on a piggyback vehicle according to claim 1, characterized in that, The drive unit (215) is fixed to the side wall of the receiving seat (214).

3. The lifting device for loading and unloading cargo on a piggyback vehicle according to claim 2, characterized in that, The support plate (210) has a notch on its rear side.

4. The lifting device for loading and unloading cargo on a piggyback vehicle according to claim 1, characterized in that, It includes two symmetrically arranged self-locking lever groups (400), which are connected by a connecting block (421). The driving device (300) drives the connecting block to drive the two self-locking lever groups (400) simultaneously.

5. The lifting device for loading and unloading cargo on a piggyback vehicle according to claim 4, characterized in that, The base plate (110) is provided with a fixed arm (120), the fixed arm (120) is perpendicular to the base plate (110), the fixed arm (120) is provided with a sliding groove (121), the sliding groove (121) extends in the length direction of the transport vehicle, the triangular connecting rod (430) and the lifting device (410) are pivotally connected by a second pin (502), the second pin (502) is slidably connected to the sliding groove (121); One end of the rocker arm (422) is pivotally connected to the base plate (110) via the first pin (501), and the other end of the rocker arm (422) is pivotally connected to the triangular connecting rod (430) via the third pin (503). When the self-locking rod assembly (400) is in the self-locking state, the line connecting the first pin (501), the second pin (502) and the third pin (503) is parallel to the base plate (110).

6. The lifting device for loading and unloading cargo on a piggyback vehicle according to claim 5, characterized in that, The lifting device (410) includes a first support rod (411) and a second support rod (412), the first support rod (411) and the second support rod (412) are pivotally connected at the middle of the length direction to form an X shape; The second pin (502) passes through one end of the first support rod (411) near the bottom plate (110), and the other end of the first support rod (411) away from the bottom plate (110) is slidably connected to the support plate (210); The two ends of the second support rod (412) are pivotally connected to the support plate (210) and the base plate (110), respectively.

7. The lifting device for loading and unloading cargo on a piggyback vehicle according to claim 6, characterized in that, The second pin (502) is provided with a first support wheel, which contacts the base plate (110); and / or A second support wheel is also provided at the end of the first support rod (411) that contacts the support plate (210).

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