Rear unloading semi-trailer cargo box and semi-trailer

Abstract

This utility model provides a rear-discharge semi-trailer body and semi-trailer, including a semi-trailer frame, a front box assembly, a lifting cylinder, and an upper frame assembly mounted on the semi-trailer frame that can be lifted by the lifting cylinder. The semi-trailer frame is respectively provided with a frame towing pin and a lower cylinder support, with the lower cylinder support closely attached to the frame towing pin. A conical cylinder fixing plate is provided inside the front box assembly, and an upper cylinder support is provided on the upper part of the front box assembly. The top of the conical cylinder fixing plate is connected to the upper cylinder support. The top of the lifting cylinder is connected to the upper cylinder support, and the bottom of the lifting cylinder is connected to the lower cylinder support. This ensures that when the lifting cylinder lifts, the lifting force at the top of the lifting cylinder is transmitted to the front box assembly, and the supporting force at the bottom of the lifting cylinder is directly transmitted to the frame towing pin. This rear-discharge semi-trailer body and semi-trailer achieve lightweight design while ensuring lifting stability.

Description

Technical Field

[0001] This utility model relates to the field of semi-trailers, specifically to a rear-discharge semi-trailer body and a semi-trailer. Background Technology

[0002] Currently, most rear-dump semi-trailers on the market use the FC-type cylinder arrangement, where the cylinder has a vertical structure with two fixed trunnions in the middle, fixed to the front cargo box via upper supports. In this structure, the cylinder is generally far from the drawbar, essentially a cantilever beam relative to the frame drawbar. During heavy lifting, the cylinder bends downwards relative to the frame drawbar. If the deformation of the left and right beams is inconsistent, it can easily lead to rollover, a significant factor contributing to the instability of traditional lifting structures. Furthermore, FC-type cylinders of the same specifications and models are approximately 100kg heavier than FE-type cylinders. With the increasing demand for lightweight construction, the FC-type cylinder layout cannot meet these market requirements.

[0003] Utility model patent CN202123966U discloses a double-articulated lifting mechanism for a front-mounted top dump truck. A front crossbeam is arranged within the longitudinal beam of the subframe, and a front baffle is supported on the longitudinal beam. A cap plate is welded to the upper part of the front baffle, and a top plate cross rib is welded to the lower middle part of the cap plate. A lifting cylinder is arranged between the front crossbeam and the top plate cross rib. The lower part of the lifting cylinder is connected to a lower right support and a lower left support welded to the front crossbeam via a lower pin, and the upper part of the lifting cylinder is connected to an upper right support and an upper left support welded to the top plate cross rib via an upper pin. In this double-articulated lifting mechanism for a front-mounted top dump truck, the connecting pins at the upper and lower parts of the lifting cylinder can swing within a certain range during lifting, eliminating lateral forces on the lifting cylinder and effectively preventing deformation of the lifting cylinder caused by the side tilt of the truck body, thus effectively protecting the lifting cylinder. However, in the disclosed structure of the dual-articulated lifting mechanism of the front-mounted top dump truck, the lower part of the lifting cylinder is far from the traction pin of the vehicle frame, resulting in insufficient stability during lifting. Utility Model Content

[0004] To achieve both lightweight design of the rear-discharge semi-trailer cargo box and ensure lifting stability, the technical solution adopted in this utility model is as follows: a rear-discharge semi-trailer cargo box, including a semi-trailer frame, a front cargo box assembly, a lifting cylinder, and an upper frame assembly mounted on the semi-trailer frame, which can be lifted by the lifting cylinder. The front cargo box assembly is mounted on the upper frame assembly. The semi-trailer frame is respectively provided with a frame traction pin and a lower cylinder support. The lower cylinder support is set close to the frame traction pin. A conical cylinder fixing plate is provided inside the front box assembly. An upper cylinder support is provided on the upper part of the front box assembly. The top of the conical cylinder fixing plate is connected to the upper cylinder support. The top of the lifting cylinder is connected to the upper support of the cylinder, and the bottom of the lifting cylinder is connected to the lower support of the cylinder, so that when the lifting cylinder is lifted, the lifting force at the top of the lifting cylinder is transmitted to the front box assembly, and the supporting force at the bottom of the lifting cylinder is directly transmitted to the frame towing pin.

[0005] Beneficial effects: On the one hand, by shortening the distance between the lower support of the hydraulic cylinder and the frame traction pin, the supporting force can be directly transmitted to the frame traction pin, improving the lifting stability at the bottom of the lifting cylinder. On the other hand, by using the upper support of the hydraulic cylinder to connect the lifting cylinder to the front box assembly, the lifting force at the top of the lifting cylinder is directly transmitted to the front box assembly, ensuring the uniformity of force distribution on the front box assembly.

[0006] Based on the above, the distance between the axis of the lower support of the hydraulic cylinder and the axis of the traction pin of the vehicle frame is 0 to 500 mm.

[0007] Beneficial effects: By limiting the distance range between the axis of the lower support of the hydraulic cylinder and the axis of the traction pin of the vehicle frame, the lifting stability of the hydraulic cylinder is ensured, while also ensuring that the hydraulic cylinder has sufficient extension and retraction range, which facilitates lifting and unloading.

[0008] Based on the above, the front compartment assembly includes an upper cross brace, a front compartment end plate, a right front pillar, and a left front pillar, wherein the upper cross brace and the front compartment end plate are respectively connected between the right front pillar and the left front pillar; The upper support of the hydraulic cylinder is mounted on the upper cross brace of the front compartment so that when the lifting cylinder is lifted, the lifting force at the top of the lifting cylinder is transmitted to the upper cross brace of the front compartment, and then to the right front pillar and the left front pillar.

[0009] Beneficial effects: By specifically defining the structure of the front box assembly, the structural strength of the front box assembly can be enhanced, ensuring that the upper cross brace, right front pillar and left front pillar of the front box can withstand the lifting force at the top of the lifting cylinder.

[0010] Based on the above, the upper support of the hydraulic cylinder is located in the middle of the upper cross brace of the front compartment, and the lower support of the hydraulic cylinder is located on the central axis of the semi-trailer frame, so that the upper frame assembly does not shift when the lifting hydraulic cylinder is lifted.

[0011] Beneficial effects: By defining the installation positions of the upper and lower supports of the hydraulic cylinder respectively, it is possible to avoid a large deviation between the central axis of the hydraulic cylinder and the central axis of the upper frame assembly, thus ensuring uniform force distribution on the upper frame assembly.

[0012] Based on the above, the conical cylinder fixing plate is formed by bending a sheet metal, and the top of the conical cylinder fixing plate is provided with a pin hole for installing the upper fixing seat pin.

[0013] Beneficial effect: The conical cylinder mounting plate of this structure can reduce its own weight.

[0014] Based on the above, the front cover plate has a vertical clearance hole at the position corresponding to the conical cylinder fixing plate, so that the lifting cylinder can extend and retract.

[0015] Based on the above, the upper support of the hydraulic cylinder is located obliquely above the lower support of the hydraulic cylinder, so that the lifting hydraulic cylinder is in a retracted state and is obliquely connected between the upper support of the hydraulic cylinder and the lower support of the hydraulic cylinder.

[0016] Based on the above, a hydraulic oil tank is provided at the front end of the semi-trailer frame, and a front cover visor is provided on the outer side of the upper cross brace of the front compartment to protect the hydraulic oil tank.

[0017] Beneficial effects: The hydraulic oil tank can be set up close to the lifting cylinder, which facilitates the supply of oil to the lifting cylinder. At the same time, the front cover can be used to protect the hydraulic cylinder and prevent the hydraulic cylinder from being damaged by falling goods.

[0018] This utility model also provides a semi-trailer, which includes the above-mentioned rear-discharge semi-trailer cargo box.

[0019] This utility model has substantial features and advancements compared to existing technologies. Specifically, the rear-discharge semi-trailer cargo box and semi-trailer provided by this utility model utilize the upper support of the hydraulic cylinder to connect the lifting cylinder to the front cargo box assembly, and the lower support of the hydraulic cylinder is closely attached to the vicinity of the frame towing pin. This allows the lifting cylinder to be tilted and embedded inside the front cargo box assembly, shortening the distance between the lower support of the hydraulic cylinder and the frame towing pin. This ensures that during lifting, the lifting force at the top of the lifting cylinder is directly transmitted to the front cargo box assembly, and the lower part of the lifting cylinder can directly transmit the supporting force to the frame towing pin, effectively solving the problem of unstable lifting.

[0020] Furthermore, by setting the upper support of the hydraulic cylinder on the conical hydraulic cylinder fixing plate, and by adopting an integral plate-folding structure for the conical hydraulic cylinder fixing plate, and using a conical structure with a cross-section similar to an isosceles trapezoid, the area at the top of the upper conical hydraulic cylinder fixing plate can be reduced to the greatest extent, thereby achieving a lightweight design for the trailer.

[0021] Furthermore, by designing the front box assembly as a combination of a right front pillar, an upper cross brace, a front box visor, a ladder, and a left front pillar component, the upper cross brace of the hydraulic cylinder can be primarily used to bear the hydraulic cylinder stress.

[0022] Therefore, the rear-discharge semi-trailer body and semi-trailer can achieve lightweight rear-discharge semi-trailer body while ensuring the lifting stability of the rear-discharge semi-trailer. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the rear-discharge semi-trailer cargo box and the cargo box in the semi-trailer provided by this utility model.

[0024] Figure 2 This is a schematic diagram of the rear-discharge semi-trailer cargo box and the front structure of the cargo box in the semi-trailer provided by this utility model.

[0025] Figure 3 This is a schematic diagram of the rear-discharge semi-trailer cargo box and the interior of the cargo box in the semi-trailer provided by this utility model.

[0026] Figure 4 This is a schematic diagram of the rear-discharge semi-trailer cargo box and a partial structure of the cargo box in the semi-trailer provided by this utility model.

[0027] Figure 5 This is a schematic diagram of the structure of the rear-unloading semi-trailer and the semi-trailer in a lifted state, provided by this utility model.

[0028] Figure 6 This is a schematic diagram of the rear-discharge semi-trailer cargo box and the side structure of the cargo box in the semi-trailer provided by this utility model.

[0029] Figure 7 This is a schematic diagram of the conical cylinder fixing plate structure in the rear-discharge semi-trailer box and the semi-trailer provided by this utility model.

[0030] In the diagram: 1. Side box assembly; 2. Semi-trailer frame; 3. Frame towing pin; 4. Conical cylinder mounting plate; 5. Front box assembly; 6. Hydraulic oil tank; 7. Lifting cylinder; 8. Lower cylinder support; 9. Upper cylinder support; 10. Rear box assembly; 11. Upper frame assembly; 12. Right side box assembly; 13. Left side box assembly; 14. Right front pillar; 15. Pin hole; 16. Front box cover plate; 17. Ladder; 18. Left front pillar; 19. Front box visor; 20. Upper cross brace of the front box. Detailed Implementation

[0031] The technical solution of this utility model will be further described in detail below through specific embodiments. Example 1

[0032] This embodiment provides a rear-discharge semi-trailer cargo box, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the vehicle includes a semi-trailer frame 2, a front cargo box assembly 5, a lifting cylinder 7, and an upper frame assembly 11 that can be lifted by the lifting cylinder 7 and mounted on the semi-trailer frame 2. The front cargo box assembly 5 is mounted on the upper frame assembly 11.

[0033] The semi-trailer frame 2 is respectively equipped with a frame traction pin 3 and a lower cylinder support 8, with the lower cylinder support 8 being set close to the frame traction pin 3. A conical cylinder fixing plate 4 is provided on the inner side of the front box assembly 5, and an upper cylinder support 9 is provided on the upper part of the front box assembly 5, with the top of the conical cylinder fixing plate 4 connected to the upper cylinder support 9.

[0034] The top of the lifting cylinder 7 is connected to the upper cylinder support 9, and the bottom of the lifting cylinder 7 is connected to the lower cylinder support 8, so that when the lifting cylinder 7 is lifted, the lifting force at the top of the lifting cylinder 7 is transmitted to the front box assembly 5, and the supporting force at the bottom of the lifting cylinder 7 is directly transmitted to the frame traction pin 3.

[0035] Preferably, in this embodiment, the distance between the axis of the lower support 8 of the hydraulic cylinder and the axis of the traction pin 3 of the vehicle frame can be selected from 0 to 500 mm. The lifting hydraulic cylinder 7 is an FE type hydraulic cylinder.

[0036] Specifically, such as Figure 6 As shown, the front compartment assembly 5 includes an upper front cross brace 20, a front compartment sealing plate 16, a right front pillar 14, and a left front pillar 18. The upper front cross brace 20 and the front compartment sealing plate 16 are respectively connected between the right front pillar 14 and the left front pillar 18. Preferably, the upper front cross brace 20 adopts a square tube structure with vertically arranged square tubes, which can well withstand the torque transmitted by the lifting cylinder.

[0037] The upper support 9 of the hydraulic cylinder is mounted on the upper cross brace 20 of the front compartment so that when the lifting cylinder 7 is lifted, the lifting force at the top of the lifting cylinder 7 is transmitted to the upper cross brace 20 of the front compartment, and then to the right front pillar 14 and the left front pillar 18.

[0038] The upper support 9 of the hydraulic cylinder is located obliquely above the lower support 8 of the hydraulic cylinder, so that the lifting hydraulic cylinder 7 is in a retracted state and is obliquely connected between the upper support 9 of the hydraulic cylinder and the lower support 8 of the hydraulic cylinder.

[0039] Example 2 This embodiment provides a rear-discharge semi-trailer cargo box. The difference from embodiment 1 is that in this embodiment, the upper support 9 of the hydraulic cylinder is located in the middle of the upper cross brace 20 of the front cargo box, and the lower support 8 of the hydraulic cylinder is located on the central axis of the semi-trailer frame 2, so that the upper frame assembly 11 does not shift when the lifting hydraulic cylinder 7 is lifted. Example 3

[0040] This embodiment provides a rear-discharge semi-trailer body. The difference from Embodiment 1 is that in this embodiment, the conical cylinder fixing plate 4 is formed by bending sheet metal. This structure minimizes the area of ​​the conical cylinder fixing plate, achieving a lightweight trailer design. The top of the conical cylinder fixing plate 4 has a pin hole 15 for installing the upper fixing seat pin. Example 4

[0041] This embodiment provides a rear-discharge semi-trailer cargo box, which differs from Embodiment 1 in that, in this embodiment: Figure 2 and Figure 6 As shown, the front compartment cover 16 has a vertical clearance hole at the position corresponding to the conical cylinder fixing plate 4, so that the lifting cylinder can extend and retract. The upper frame assembly is also provided with a side compartment assembly 1 and a rear compartment assembly 10. The side compartment assembly 1 can be divided into a right side compartment assembly 12 and a left side compartment assembly 13 according to its position. Example 5

[0042] This embodiment provides a rear-discharge semi-trailer cargo box, which differs from Embodiment 1 in that: in this embodiment, a hydraulic oil tank 6 is provided at the front end of the semi-trailer frame 2, and a front cargo box cap 19 for protecting the hydraulic oil tank 6 is provided on the outside of the upper cross brace 20 of the front cargo box. A ladder 17 is provided on the left front pillar 18. Example 6

[0043] This embodiment provides a semi-trailer that includes the rear-discharge semi-trailer cargo box provided in Embodiment 1.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A rear-discharge semi-trailer cargo box, comprising a semi-trailer frame, a front cargo box assembly, a lifting cylinder, and an upper frame assembly mounted on the semi-trailer frame and liftable by the lifting cylinder, wherein the front cargo box assembly is mounted on the upper frame assembly, characterized in that: The semi-trailer frame is respectively provided with a frame traction pin and a lower cylinder support. The lower cylinder support is set close to the frame traction pin. A conical cylinder fixing plate is provided inside the front box assembly. An upper cylinder support is provided on the upper part of the front box assembly. The top of the conical cylinder fixing plate is connected to the upper cylinder support. The top of the lifting cylinder is connected to the upper support of the cylinder, and the bottom of the lifting cylinder is connected to the lower support of the cylinder, so that when the lifting cylinder is lifted, the lifting force at the top of the lifting cylinder is transmitted to the front box assembly, and the supporting force at the bottom of the lifting cylinder is directly transmitted to the frame towing pin.

2. The rear-discharge semi-trailer cargo box according to claim 1, characterized in that: The distance between the axis of the lower support of the hydraulic cylinder and the axis of the traction pin of the vehicle frame ranges from 0 to 500 mm.

3. The rear-discharge semi-trailer cargo box according to claim 1 or 2, characterized in that: The front compartment assembly includes an upper cross brace, a front compartment cover plate, a right front pillar, and a left front pillar. The upper cross brace and the front compartment cover plate are respectively connected between the right front pillar and the left front pillar. The upper support of the hydraulic cylinder is mounted on the upper cross brace of the front compartment so that when the lifting cylinder is lifted, the lifting force at the top of the lifting cylinder is transmitted to the upper cross brace of the front compartment, and then to the right front pillar and the left front pillar.

4. The rear-discharge semi-trailer cargo box according to claim 3, characterized in that: The upper support of the hydraulic cylinder is located in the middle of the upper cross brace of the front box, and the lower support of the hydraulic cylinder is located on the central axis of the semi-trailer frame, so that the upper frame assembly does not shift when the lifting hydraulic cylinder is lifted.

5. The rear-discharge semi-trailer cargo box according to claim 3, characterized in that: The conical cylinder fixing plate is formed by bending a sheet metal, and the top of the conical cylinder fixing plate has a pin hole for installing the upper fixing seat pin.

6. The rear-discharge semi-trailer cargo box according to claim 3, characterized in that: The front cover plate has a vertical clearance hole at the position corresponding to the conical cylinder fixing plate, so that the lifting cylinder can extend and retract.

7. The rear-discharge semi-trailer cargo box according to claim 1 or 2, characterized in that: The upper support of the hydraulic cylinder is located diagonally above the lower support of the hydraulic cylinder, so that the lifting hydraulic cylinder is in a retracted state and is diagonally connected between the upper support and the lower support of the hydraulic cylinder.

8. The rear-discharge semi-trailer cargo box according to claim 3, characterized in that: The semi-trailer frame is equipped with a hydraulic oil tank at the front end, and a front cover visor is provided on the outer side of the upper cross brace of the front compartment to protect the hydraulic oil tank.

9. A semi-trailer, characterized in that: The semi-trailer includes the rear-discharge semi-trailer cargo box as described in any one of claims 1 to 8.

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