Upward-turning large box side door up-down hydraulic lifting system

Abstract

The invention relates to the technical field of dump trucks, in particular to an up-down hydraulic lifting system for side doors of a rear-turning large box, which comprises a rear-turning box body, two side doors and two stabilizing assemblies, the rear-turning box body is provided with two sliding chutes, and each stabilizing assembly comprises a plurality of electronic suckers, two sucker storage bins, two cross motion rods, a cross support shaft and a cross driving unit. The cross driving unit is arranged below the rear-turning box body, when the rear-turning box body performs rear-turning unloading, the side doors extend out of the sliding grooves, the two sides of the rear-turning box body are limited, materials are prevented from being scattered, meanwhile, the cross driving unit is started to drive the cross moving rod to rotate, and then the two suction cup storage bins are driven to gradually move upwards under supporting of the cross supporting shaft; when arriving at one side of the side door, the electronic sucker is started to adsorb and reinforce the side door; therefore, by adsorbing and fixing the side face of the side door, reinforcing and supporting of the side door are achieved, the use stability is improved, and the risk of breakage or deformation is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of dump trucks, in particular to an up and down hydraulic lifting system for a rear-flip large box side door. Background Art

[0002] In cargo transportation, dump trucks are usually used as the main means of transportation. The loading box of the dump truck can be flipped backwards to automatically unload the materials without manual intervention, which significantly improves the unloading efficiency. However, when unloading, the materials inside the box are easy to spill from both sides, causing material waste and even creating safety hazards for personnel. Therefore, at present, liftable side doors are set on both sides of the flip-back box. When flipping backwards to unload, the side doors are raised to achieve limit protection on both sides of the box, preventing materials from spilling from the sides and protecting pedestrians around.

[0003] In the aforementioned prior art, after the side doors extend out from the box, they are supported only by the hydraulic cylinder inside the box, and the support is relatively weak. In addition, when the box is flipped over, the internal materials continue to squeeze the side doors on both sides during the dumping process, which easily causes the side doors to break or deform, resulting in a short service life and poor stability in use. Summary of the Invention

[0004] The purpose of the present invention is to provide a hydraulic lifting system for the side doors of a rear-flipping large box, which solves the problem in the prior art that after the side doors extend out of the box, they are only supported by the hydraulic cylinders inside the box, and the support is weak. In addition, when the box is flipped backward, the internal materials continue to squeeze the side doors on both sides during the dumping process, which easily causes the side doors to break or deform, resulting in a short service life and poor stability in use.

[0005] To achieve the above-mentioned object, the present invention provides a hydraulic lifting system for the side doors of a rear-flip large box, comprising a rear-flip box body, two side doors, and two stabilizing components. The rear-flip box body has two slide grooves, and the two side doors are respectively slidably connected to the corresponding slide grooves. The two stabilizing components are symmetrically arranged on the rear-flip box body. The stabilizing component includes multiple electronic suction cups, two suction cup storage bins, two cross motion rods, a cross support shaft and a cross drive unit. The cross drive unit is arranged below the rear flip box. One end of the two cross motion rods is respectively connected to the corresponding cross drive unit, and the other end of the two cross motion rods is respectively provided with the corresponding suction cup storage bins. The cross support shaft passes through the intersection of the two cross motion rods and is rotatably connected to the two cross motion rods. Multiple electronic suction cups are respectively arranged inside the corresponding suction cup storage bins.

[0006] Among them, the stabilizing component also includes multiple suction cup pushing components, a suction cup support plate, two sealing rings, multiple hydraulic lifting components and a discharge port adjustment unit. The multiple suction cup pushing components are all arranged on one side of the suction cup storage bin, and the output ends of the multiple suction cup pushing components pass through the suction cup storage bin and are fixedly connected to the suction cup support plate. The multiple electronic suction cups are sequentially arranged on the suction cup support plate, and the two sealing rings are respectively arranged at the corresponding sliding grooves and the sliding parts of the side doors. The multiple hydraulic lifting components are sequentially arranged inside the sliding grooves, and the output ends of the multiple hydraulic lifting components are fixedly connected to the side doors. The discharge port adjustment unit is arranged on the side doors.

[0007] Among them, the discharge port adjustment unit includes an adjustment plate, an adjustment drive component and a drive shaft. The adjustment plate is rotatably connected to the side gate. The side gate has a trough body. The adjustment drive component is arranged inside the trough body. The two ends of the drive shaft are respectively fixedly connected to the adjustment plate and the output end of the adjustment drive component.

[0008] The discharge port adjustment unit further includes two abutting components and two abutting blocks. The two abutting components are sequentially arranged inside the trough body, and the output ends of the two abutting components are respectively fixedly connected to the corresponding abutting blocks.

[0009] Among them, the stabilizing component also includes multiple telescopic parts and telescopic warehouses, the rear flip box also has a groove, and the multiple telescopic parts are arranged in sequence inside the groove. The output ends of the multiple telescopic parts are fixedly connected to the telescopic warehouse, and the cross drive unit is arranged inside the telescopic warehouse.

[0010] In which, the cross-drive unit includes a cross-drive component, a connecting shaft, two threaded rods, and two threaded blocks. The cross-drive component is fixedly connected to the inner wall of the telescopic warehouse, and the connecting shaft is located inside the telescopic warehouse. One end of the two threaded rods is fixedly connected to the connecting shaft and is symmetrically distributed at both ends of the connecting shaft. The other ends of the two threaded rods are respectively arranged on the output end of the cross-drive component and the inner wall of the telescopic warehouse. The two threaded blocks are respectively adapted to the corresponding threaded rods, and one end of the two cross-motion rods is respectively rotatably connected to the top of the corresponding threaded block.

[0011] Wherein, the cross drive unit further includes a plurality of limiting mechanisms and two telescopic mechanisms. The plurality of limiting mechanisms are sequentially arranged inside the telescopic bin, and the two telescopic mechanisms are symmetrically arranged at both ends of the cross support shaft.

[0012] In which, the limiting mechanism includes a limiting component, a limiting block and a plurality of limiting grooves. The limiting component is arranged inside the threaded block, the output end of the limiting component is fixedly connected to the limiting block, and the plurality of limiting grooves are arranged in sequence on the inner bottom wall of the telescopic warehouse, and the limiting block and the limiting grooves are adapted to each other.

[0013] Among them, the telescopic mechanism includes a telescopic rod and a connecting rod. The telescopic rod is arranged on the inner wall of the telescopic bin. One end of the connecting rod is rotatably connected to one end of the cross support shaft, and the other end of the connecting rod is fixedly connected to the telescopic end of the telescopic rod.

[0014] Among them, the upper and lower hydraulic lifting system of the rear-flip large box side door also includes a winding component, a winding shaft, a torque sensor, a rain shield, a metal pull block and an electromagnet. The side door has an expansion slot, the winding component is arranged inside the expansion slot, the output end of the winding component is fixedly connected to the winding shaft, the torque sensor is arranged at the output end of the winding component, one end of the rain shield is wrapped around the outside of the winding shaft, the other end of the rain shield passes through the expansion slot and is fixedly connected to the metal pull block, and the electromagnet is arranged on the other side door.

[0015] The present invention provides an upper and lower hydraulic lifting system for the side doors of a rear-flip large box. When the rear-flip box is flipped over to unload materials, the side doors extend from the slide slot to limit the two sides of the rear-flip box to prevent materials from spilling. At the same time, the cross-drive unit is started to drive the cross-motion rod to rotate, and then, under the support of the cross-support shaft, the two suction cup storage bins are driven to gradually move upward to one side of the side door. At this time, the electronic suction cup is started to adsorb and reinforce the side door; thereby, by relying on the adsorption and fixation of the side sides of the side door, the reinforcement support of the side door is achieved, the stability of use is improved, and the risk of breakage or deformation is reduced. At the same time, when not in use, the electronic suction cup and its drive accessories used for reinforcement can also be stored under the rear-flip box to avoid taking up too much space, thereby making it more convenient to use the rear-flip box of the dump truck. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0017] Figure 1 It is a structural schematic diagram of the upper and lower hydraulic lifting system of the rear-flip large box side door of the present invention.

[0018] Figure 2 It is a cross-sectional view of the upper and lower hydraulic lifting system of the rear-flip large box side door of the present invention.

[0019] Figure 3The present invention Figure 2 AA line section view.

[0020] Figure 4 The present invention Figure 2 A magnified view of the local structure at point B.

[0021] Figure 5 The present invention Figure 2 A magnified view of the local structure at point C.

[0022] Figure 6 It is a structural schematic diagram of the telescopic warehouse of the present invention.

[0023] Figure 7 It is a diagram of the internal structure of the telescopic warehouse of the present invention.

[0024] Figure 8 It is a cross-sectional view of the tank body of the present invention.

[0025] Figure 9 The present invention Figure 8 Enlarged view of the local structure at point D.

[0026] Figure 10 It is a diagram of the internal structure of the expansion slot of the present invention.

[0027] 1-rear flip box, 2-side door, 3-slide, 4-electronic suction cup, 5-suction cup storage bin, 6-cross motion rod, 7-cross support shaft, 8-suction cup push-out component, 9-suction cup support plate, 10-sealing ring, 11-hydraulic lifting component, 12-adjustment plate, 13-adjustment drive component, 14-drive shaft, 15-trough body, 16-holding component, 17-holding block, 18-telescopic component, 19-telescopic bin, 20-groove, 21-cross drive component, 22-connecting shaft, 23-threaded rod, 24-threaded block, 25-limiting component, 26-limiting block, 27-limiting slot, 28-telescopic rod, 29-connecting rod, 30-winding component, 31-winding shaft, 32-torque sensor, 33-rain shield, 34-metal pull block, 35-electromagnet, 36-expansion slot. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0029] The present invention provides a hydraulic lifting system for the side doors of a rear-flip large box, comprising a rear-flip box body 1, two side doors 2 and two stabilizing components, wherein the rear-flip box body 1 has two slide slots 3, the stabilizing components comprising a plurality of electronic suction cups 4, two suction cup storage bins 5, two cross motion rods 6, a cross support shaft 7 and a cross drive unit, the stabilizing components further comprising a plurality of suction cup push-out components 8, a suction cup support plate 9, two sealing rings 10, a plurality of hydraulic lifting components 11 and a discharge port adjustment unit, the discharge port adjustment unit comprising an adjustment plate 12, an adjustment drive component 13 and a drive shaft 14, the discharge port adjustment unit further comprising two abutting components 16 and two abutting blocks 17, the stabilizing components The fixed component also includes multiple telescopic parts 18 and telescopic bins 19. The rear flip box body 1 also has a groove 20. The cross drive unit includes a cross drive part 21, a connecting shaft 22, two threaded rods 23, and two threaded blocks 24. The cross drive unit also includes multiple limiting mechanisms and two telescopic mechanisms. The limiting mechanism includes a limiting part 25, a limiting block 26 and multiple limiting grooves 27. The telescopic mechanism includes a telescopic rod 28 and a connecting rod 29. The upper and lower hydraulic lifting system of the rear flip box side door also includes a winding part 30, a winding shaft 31, a torque sensor 32, a rain shield 33, a metal pull block 34 and an electromagnet 35. The side door 2 has an expansion slot 36.

[0030] Among them, see Figures 1 to 3 The rear flip box 1 has two slide grooves 3, and the two side doors 2 are slidingly connected to the corresponding slide grooves 3 respectively. The two stabilizing components are symmetrically arranged on the rear flip box 1; the cross drive unit is arranged below the rear flip box 1, and one end of the two cross motion rods 6 is respectively connected to the corresponding cross drive unit, and the other ends of the two cross motion rods 6 are respectively provided with corresponding suction cup storage bins 5, and the cross support shaft 7 passes through the intersection of the two cross motion rods 6 and is rotatably connected to the two cross motion rods 6, and a plurality of electronic suction cups 4 are respectively arranged inside the corresponding suction cup storage bins 5. Before loading materials, the rear flip box 1 needs to be installed on the dump truck; when the rear flip box 1 is flipped over to unload materials, the side door 2 extends from the slide 3 to limit the two sides of the rear flip box 1 to prevent materials from spilling, and at the same time, the cross drive unit is started, driving the cross motion rod 6 to rotate, and then under the support of the cross support shaft 7, the two suction cup storage bins 5 are driven to gradually move upward to one side of the side door 2, and then the electronic suction cup 4 is moved toward the side door 2 and pressed against the outside of the side door 2. At this time, the electronic suction cup 4 is started, generating negative pressure to adsorb the side door 2 to achieve a reinforcement effect.

[0031] Second, see Figure 7, multiple suction cup pushing components 8 are all arranged on one side of the suction cup storage bin 5, multiple output ends of the suction cup pushing components 8 pass through the suction cup storage bin 5, and are all fixedly connected to the suction cup support plate 9, multiple electronic suction cups 4 are sequentially arranged on the suction cup support plate 9, two sealing rings 10 are respectively arranged at the sliding parts of the corresponding slide 3 and the side door 2, multiple hydraulic lifting components 11 are sequentially arranged inside the slide 3, multiple output ends of the hydraulic lifting components 11 are all fixedly connected to the side door 2, and the discharge port adjustment unit is arranged on the side door 2. The suction cup pushing component 8 is a self-locking hydraulic cylinder. After the suction cup pushing component 8 is started, it drives the suction cup support plate 9 to move, thereby making the electronic suction cup 4 close to the side gate 2. At this time, the electronic suction cup 4 is started and adsorbs the side gate 2, so that the side gate 2 is stably supported and reinforced through the cooperation of multiple electronic suction cups 4. In addition, when the side gate 2 slides in the chute 3, the sealing ring 10 seals the sliding part to prevent material particles from entering the chute 3. The hydraulic lifting component 11 is a self-locking hydraulic cylinder. After the hydraulic lifting component 11 is started, it can drive the side gate 2 to slide in the chute 3. The discharge port adjustment unit can adjust the discharged material to concentrate or diffuse.

[0032] Also, see Figures 8 to 10 The side door 2 has a slot 15, and the adjustment drive component 13 is disposed within the slot 15. The ends of the drive shaft 14 are fixedly connected to the adjustment plate 12 and the output end of the adjustment drive component 13, respectively. First, the side door 2 is extended from the chute 3. At this time, the adjustment drive component 13 is activated, driving the drive shaft 14 to rotate, driving the adjustment plate 12 to rotate, and then the two adjustment plates 12 move relative to each other, reducing the discharge area. They can also move in opposite directions, expanding the discharge area, thereby adapting to different discharge situations. The adjustment drive component 13 is a self-locking motor.

[0033] Also, see Figure 9 and Figure 10 The two abutting components 16 are sequentially disposed within the trough 15, and the output ends of the two abutting components 16 are fixedly connected to the corresponding abutting blocks 17. The abutting components 16 are self-locking hydraulic cylinders. When the size of the discharge port is determined, the abutting components 16 are activated, driving the abutting blocks 17 to move, thereby limiting the drive shaft 14 and preventing the adjustment plate 12 from rotating.

[0034] Then, the rear flip box 1 further has a groove 20, and the multiple telescopic components 18 are sequentially arranged inside the groove 20. The output ends of the multiple telescopic components 18 are fixedly connected to the telescopic bin 19, and the cross drive unit is arranged inside the telescopic bin 19. The telescopic component 18 is a self-locking hydraulic cylinder. When the telescopic component 18 is activated, it can drive the telescopic bin 19 to slide and then be located on one side of the rear flip box 1. At this time, the cross drive unit can be activated to move the electronic suction cup 4 upward for subsequent reinforcement.

[0035] Again, see Figure 7 The cross-drive component 21 is fixedly connected to the inner wall of the telescopic bin 19. The connecting shaft 22 is located inside the telescopic bin 19. One end of the two threaded rods 23 is fixedly connected to the connecting shaft 22 and symmetrically distributed at both ends of the connecting shaft 22. The other ends of the two threaded rods 23 are respectively arranged at the output end of the cross-drive component 21 and the inner wall of the telescopic bin 19. The two threaded blocks 24 are respectively adapted to the corresponding threaded rods 23. One end of the two cross-motion rods 6 is respectively rotatably connected to the upper part of the corresponding threaded blocks 24. The cross-drive component 21 is a self-locking motor. When the cross-drive component 21 is started, it drives the two threaded rods 23 to rotate through the connection of the connecting shaft 22, and cooperates with the threaded blocks 24. When the two threaded blocks 24 move relative to each other, the cross-motion rod 6 is driven to rotate around the cross-support shaft 7. In addition, the two threaded rods 23 are arranged with opposite rotation directions.

[0036] Also, see Figure 7 Multiple limiting mechanisms are sequentially arranged inside the telescopic bin 19, and two of the telescopic mechanisms are symmetrically arranged at both ends of the cross support shaft 7. The limiting mechanisms limit and reinforce the threaded block 24 to prevent the cross motion rod 6 from moving erroneously. The telescopic mechanisms can enable the cross support shaft 7 to telescope up and down, thereby adapting to the motion trajectory of the cross motion rod 6. When the cross motion rod 6 rotates, it drives the cross support shaft 7 to move up and down, avoiding motion interference.

[0037] Therefore, please see Figure 3 and Figure 5 The limiting component 25 is disposed inside the threaded block 24. The output end of the limiting component 25 is fixedly connected to the limiting block 26. A plurality of limiting grooves 27 are sequentially disposed on the inner bottom wall of the telescopic compartment 19. The limiting block 26 and the limiting grooves 27 are adapted to each other. The limiting component 25 is a self-locking electric push rod. When the limiting component 25 is activated, it drives the limiting block 26 to move, and then enters the limiting groove 27 to adapt, thereby limiting the threaded block 24.

[0038] Further, see Figure 7 The telescopic rod 28 is provided on the inner side wall of the telescopic bin 19. One end of the connecting rod 29 is rotatably connected to one end of the cross support shaft 7, and the other end of the connecting rod 29 is fixedly connected to the telescopic end of the telescopic rod 28. When the cross support shaft 7 needs to move up and down, the connecting rod 29 drives the telescopic rod 28 to extend and retract, thereby maintaining the stability of the movement.

[0039] Finally, see Figure 4 The side door 2 has an expansion slot 36, the winding component 30 is arranged inside the expansion slot 36, the output end of the winding component 30 is fixedly connected to the winding shaft 31, the torque sensor 32 is arranged at the output end of the winding component 30, one end of the rain shield 33 is wrapped around the outside of the winding shaft 31, the other end of the rain shield 33 passes through the expansion slot 36, and is fixedly connected to the metal pull block 34, and the electromagnet 35 is arranged on the other side door 2. The reeling component 30 is a self-locking motor. When the reeling component 30 is started, it drives the reeling shaft 31 to rotate, and then the rain shield 33 can be reeled up. When transporting materials, the metal pull block 34 can be moved and pulled to drive the rain shield 33 to pass over the top of the rear flip box 1, and then contact the electromagnet 35. The electromagnet 35 is energized to adsorb and fix the metal pull block 34. At this time, the rain shield 33 covers the top of the rear flip box 1, and then the rear flip box 1 can be moved when transporting materials. The rain shield 33 is blocked to reduce the impact of dust, impurities or rain on the materials. In addition, after the rain shield 33 is placed, it can be rolled up and rotated by the reel 31. At this time, the torque sensor 32 monitors the torque value. When it reaches the preset value, it indicates that the rain shield 33 has been stretched and straightened, thereby achieving the perfect installation of the rain shield 33. The various components and sensors of this application are connected to the vehicle-machine system of the transport vehicle, and then the vehicle-machine system is used to control the various equipment of the upper and lower hydraulic lifting system of the rear-flip large box side door to achieve the rear-flip unloading of materials.

[0040] When using the hydraulic lifting system for the side doors of a rear-flip large box of the present embodiment, when the rear-flip box body 1 is flipped over to unload, the hydraulic lifting component 11 is activated to drive the side door 2 to extend from the chute 3, limiting the two sides of the rear-flip box body 1 to prevent the material from spilling; at this time, the telescopic component 18 is activated to drive the telescopic bin 19 to slide toward the outside of the rear-flip box body 1 until the internal cross-drive unit is exposed and stops; then the cross-drive component 21 is activated and drives the two threaded rods 23 to rotate through the connection of the connecting shaft 22, cooperating with the threaded block 24. When the two threaded blocks 24 move relative to each other, the cross-movement rod 6 is driven to rotate around the cross-support shaft 7, so that the two suction cup storage bins 5 gradually move up to one side of the side door 2; at this time, the suction cup pushing component 8 is activated to drive the suction cup support plate 9 to move, thereby making the electronic suction cup 4 close to the outside of the side door 2. At this time, the electronic suction cup 4 is activated to generate negative pressure to adsorb and reinforce the side door 2; Through the above-mentioned structural setting, by relying on the adsorption and fixation of the side of the side door 2, the reinforcement support of the side door 2 is achieved, the stability of use is improved, and the risk of breakage or deformation is reduced. At the same time, when not in use, the electronic suction cup 4 and its drive accessories used for reinforcement can also be stored under the rear flip box 1 to avoid taking up too much space, thereby making it more convenient to use the rear flip box 1 of the dump truck.

[0041] The above disclosure is merely one or more preferred embodiments of the present application and is not intended to limit the scope of the present application. A person skilled in the art will understand that all or part of the processes of the above embodiments and equivalent changes made in accordance with the claims of the present application are still within the scope of the present application.

Claims

1. A hydraulic lifting system for the side doors of a rear-flip large box, comprising a rear-flip box body and two side doors, wherein the rear-flip box body has two slide grooves, and the two side doors are slidably connected to the corresponding slide grooves, characterized in that: It also includes two stabilizing components, which are symmetrically arranged on the rear flip box body; The stabilizing component includes multiple electronic suction cups, two suction cup storage bins, two cross motion rods, a cross support shaft and a cross drive unit. The cross drive unit is arranged below the rear flip box. One end of the two cross motion rods is respectively connected to the corresponding cross drive unit, and the other end of the two cross motion rods is respectively provided with the corresponding suction cup storage bins. The cross support shaft passes through the intersection of the two cross motion rods and is rotatably connected to the two cross motion rods. Multiple electronic suction cups are respectively arranged inside the corresponding suction cup storage bins.

2. The hydraulic lifting system for the rear-flip large box side door according to claim 1 is characterized in that: The stabilizing component also includes multiple suction cup pushing components, a suction cup support plate, two sealing rings, multiple hydraulic lifting components and a discharge port adjustment unit. The multiple suction cup pushing components are all arranged on one side of the suction cup storage bin, and the output ends of the multiple suction cup pushing components pass through the suction cup storage bin and are fixedly connected to the suction cup support plate. The multiple electronic suction cups are sequentially arranged on the suction cup support plate, and the two sealing rings are respectively arranged at the corresponding sliding grooves and the sliding parts of the side doors. The multiple hydraulic lifting components are sequentially arranged inside the sliding grooves, and the output ends of the multiple hydraulic lifting components are fixedly connected to the side doors. The discharge port adjustment unit is arranged on the side doors.

3. The hydraulic lifting system for the rear-flip large box side door according to claim 2 is characterized in that: The discharge port adjustment unit includes an adjustment plate, an adjustment drive component and a drive shaft. The adjustment plate is rotatably connected to the side gate. The side gate has a trough body. The adjustment drive component is arranged inside the trough body. The two ends of the drive shaft are respectively fixedly connected to the adjustment plate and the output end of the adjustment drive component.

4. The hydraulic lifting system for the rear-flip large box side door according to claim 3 is characterized in that: The discharge port adjustment unit further includes two abutting components and two abutting blocks. The two abutting components are sequentially arranged inside the trough body, and the output ends of the two abutting components are respectively fixedly connected to the corresponding abutting blocks.

5. The hydraulic lifting system for the rear-flip large box side door according to claim 4 is characterized in that: The stabilizing component also includes a plurality of telescopic parts and a telescopic bin. The rear flip box also has a groove. The plurality of telescopic parts are sequentially arranged inside the groove. The output ends of the plurality of telescopic parts are fixedly connected to the telescopic bin. The cross drive unit is arranged inside the telescopic bin.

6. The hydraulic lifting system for the rear-flip large box side door according to claim 5 is characterized in that: The cross-drive unit includes a cross-drive component, a connecting shaft, two threaded rods, and two threaded blocks. The cross-drive component is fixedly connected to the inner wall of the telescopic warehouse, and the connecting shaft is located inside the telescopic warehouse. One end of the two threaded rods is fixedly connected to the connecting shaft and is symmetrically distributed at both ends of the connecting shaft. The other ends of the two threaded rods are respectively arranged on the output end of the cross-drive component and the inner wall of the telescopic warehouse. The two threaded blocks are respectively adapted to the corresponding threaded rods, and one end of the two cross-motion rods is respectively rotatably connected to the top of the corresponding threaded block.

7. The hydraulic lifting system for the rear-flip large box side door according to claim 6 is characterized in that: The cross drive unit further includes a plurality of limiting mechanisms and two telescopic mechanisms. The plurality of limiting mechanisms are sequentially arranged inside the telescopic bin, and the two telescopic mechanisms are symmetrically arranged at both ends of the cross support shaft.

8. The hydraulic lifting system for the rear-flip large box side door according to claim 7 is characterized in that: The limiting mechanism includes a limiting component, a limiting block and a plurality of limiting grooves. The limiting component is arranged inside the threaded block, the output end of the limiting component is fixedly connected to the limiting block, and the plurality of limiting grooves are sequentially arranged on the inner bottom wall of the telescopic warehouse, and the limiting block and the limiting grooves are adapted to each other.

9. The hydraulic lifting system for the rear-flip large box side door according to claim 8, characterized in that: The telescopic mechanism includes a telescopic rod and a connecting rod. The telescopic rod is arranged on the inner side wall of the telescopic bin. One end of the connecting rod is rotatably connected to one end of the cross support shaft, and the other end of the connecting rod is fixedly connected to the telescopic end of the telescopic rod.

10. The hydraulic lifting system for the rear-flip large box side door according to claim 9, characterized in that: The upper and lower hydraulic lifting system of the rear-flip large box side door also includes a winding component, a winding shaft, a torque sensor, a rain shield, a metal pull block and an electromagnet. The side door has an expansion slot, the winding component is arranged inside the expansion slot, the output end of the winding component is fixedly connected to the winding shaft, the torque sensor is arranged at the output end of the winding component, one end of the rain shield is wrapped around the outside of the winding shaft, the other end of the rain shield passes through the expansion slot and is fixedly connected to the metal pull block, and the electromagnet is arranged on the other side door.

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