Four-way pallet vehicle

Abstract

The present invention relates to the technical field of four-way vehicles, and in particular to a four-way vehicle with a pallet, comprising a vehicle body, a lifting mechanism for lifting a pallet on the vehicle body, a top box fixedly connected to the top of the vehicle body, and the lifting mechanism is arranged through the top of the top box, top openings are opened on both sides of the top of the top box, and a sliding frame is slidably connected to the bottom end of the top box and below the top opening, an upper clamping plate is arranged on the inner side of the sliding frame, gears are fixedly connected to both sides of the upper clamping plate, and the gears are rotatably connected to the inner side of the sliding frame through torsion springs, and racks meshing with the gears are slidably connected to both sides of the top of the sliding frame. Through the arrangement of the above structure, the present invention can quickly open the upper clamping plate to tighten and fix the inner side of the pallet, and insert the lower clamping plate into both sides of the center column of the pallet, so as to limit the lateral and longitudinal movement position of the pallet, and can be folded and stored when not in use, thereby reducing the overall height of the four-way vehicle and improving the application range of the device.

Description

Technical Field

[0001] The invention relates to the technical field of four-way vehicles, in particular to a four-way vehicle with a pallet. Background Art

[0002] At present, due to the increasing requirements for warehouse storage capacity, picking, transportation, and in-and-out frequency, the four-way pallet truck is being used more and more widely in the field of automatic warehouses. The four-way pallet truck completes the storage and retrieval of goods on the straight track, and completes the change of shelf aisles through the turning plate and the transverse track. Compared with ordinary shelves, shuttle shelves do not require forklifts to enter the shelves to store and retrieve goods. The smaller four-way pallet truck directly enters one or more aisles of the shelf to store and retrieve goods. It can change direction along the longitudinal or transverse tracks on the cross tracks, and the four-way shuttle car is provided with a lifting pallet for supporting the pallet, so that it can reach any designated cargo location in the warehouse according to the order requirements, realizing intensive storage and transportation, and the work efficiency has been greatly improved compared to the use of forklifts.

[0003] In the prior art, a four-way shuttle vehicle with publication number CN116142671A drives a limiting component through a driving component to synchronously clamp and limit two opposite sides of the bottom of the cargo on the top surface of the lifting plate during the rising of the two lifting plates, thereby automatically limiting and releasing the limit on the bottom of the cargo placed on the top surface of the lifting plate through the cooperation of the driving component and the limiting component, thereby effectively stabilizing the cargo during the lifting and transportation process, and converting the movement of the lifting plate into a driving force for the limiting component through the driving component, thereby simplifying the overall structure of the shuttle vehicle while stabilizing the bottom of the cargo through the limiting component, simplifying the structure, and saving costs.

[0004] Although the above-mentioned device can limit the two sides of the pallet on the four-way shuttle, there are still some defects in actual use. Since the pallet limiting structure on the four-way shuttle cannot be stored, it not only increases the overall height of the four-way shuttle when in use, but also requires an overall heightening design when designing the logistics shelf, which not only increases the construction cost, but also its height is subject to the structure of the shelf, which may limit its adaptability to load-bearing and greatly reduce the flexibility of the device.

[0005] Therefore, a pallet four-way vehicle is proposed to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a pallet four-way vehicle.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is: a four-way pallet vehicle, comprising a vehicle body, a lifting mechanism for lifting the pallet is provided on the vehicle body, a top box is fixedly connected to the top of the vehicle body, and the lifting mechanism is arranged through the top of the top box, top openings are provided on both sides of the top of the top box, a sliding frame is slidably connected to the bottom end of the top box and below the top opening, an upper clamping plate is provided on the inner side of the sliding frame, gears are fixedly connected to both sides of the upper clamping plate, and the gears are rotatably connected to the inner side of the sliding frame through torsion springs, and racks meshing with gears are slidably connected to both sides of the top of the sliding frame;

[0008] Slide grooves are provided on both sides of the top of the sliding frame, and slides are fixedly connected to the side walls of the rack and located inside the slide grooves, and the side walls of the rack are fixedly connected to side plates. A pair of grooves are provided at both ends of the inner side of the top box, and rollers are rotatably connected to the inner sides of the grooves. Bottom grooves are provided at the bottom end of the top box and at positions corresponding to the grooves, and upper pull ropes are fixedly connected to the side walls of the side plates and located above the grooves, and a pair of fixed plates are fixedly connected at the middle position of the bottom end of the top box, and a winding roller is rotatably connected between the fixed plates, and the other end of the upper pull rope passes through the outer wall of the roller and is fixedly connected to the outer wall of the winding roller, and a driving mechanism for driving the winding roller to rotate is provided on the fixed plate.

[0009] In the above technical solution, further, a pair of upper plates are fixedly connected to the bottom end of the top box, and a pair of upper springs are fixedly connected between the upper plates and the side walls of the sliding frame.

[0010] In the above technical solution, further, the driving mechanism includes a driving motor, the driving motor is fixedly connected to the bottom end of the top box, the side wall of the winding roller is fixedly connected with a driven bevel gear through a fixed plate, and the output end of the driving motor is fixedly connected with a driving bevel gear meshing with the driven bevel gear through the top box.

[0011] In the above technical solution, further, the bottom grooves on both sides are not on the same horizontal line, the upper pull ropes on both sides are fixedly connected to the upper and lower sides of the winding roller respectively, and a pair of guide plates are fixedly connected at the bottom end of the top box and above the bottom grooves, and guide rollers are rotatably connected between the guide plates.

[0012] In the above technical scheme, further, rectangular frames are fixedly connected on both sides of the outer wall of the sliding frame, rectangular rods are slidably connected to the inner sides of the rectangular frames, limiting holes are provided at the bottom end of the top box and at positions corresponding to the rectangular rods, the bottoms of the rectangular rods are inserted into the inner sides of the limiting holes, lower springs are fixedly connected between the outer walls of the rectangular rods and the bottoms of the rectangular frames, release grooves are provided on the side walls of the rectangular rods, and the top ends of the release grooves are inclined, and round rods for squeezing the inclined surfaces of the release grooves are fixedly connected to the sides of the slide plates away.

[0013] In the above technical scheme, further, a pair of movable grooves are opened at the top of the upper clamping plate, and movable plates are slidably connected to the inner sides of the movable grooves. L-shaped grooves are opened at the top of the movable plates, and cylinders are rotatably connected to the inner sides of the L-shaped grooves. The side walls of the cylinders are fixedly connected to the lower clamping plate, and a lower pull rope is wrapped around the outer wall of the cylinder. A limiting plate is fixedly connected to the bottom end of the inner side of the sliding frame, and a pair of pull blocks are slidably connected to the top of the limiting plate, and one end of the lower pull rope is fixedly connected to the outer wall of the cylinder, and the other end of the lower pull rope is fixedly connected to the top of the pull block.

[0014] In the above technical solution, further, the pull-down rope is made of elastic material, a positioning block for limiting the flipping position of the lower clamp is fixedly connected to the inner side of the L-shaped groove, a spiral spring is fixedly connected to the inner side of the cylinder, and the other end of the spiral spring is fixedly connected to the inner side of the L-shaped groove.

[0015] In the above technical scheme, further, a transverse groove is opened in the middle position of the top of the upper clamping plate, a transverse plate is slidably connected to the inner side of the transverse groove, a screw is rotatably connected to the inner side of the transverse groove, and the screw passes through a threaded connection to the inner side wall of the transverse plate, the side wall of the screw passes through the side wall of the upper clamping plate and is fixedly connected to a rotating block, a pair of inclined grooves are opened through the top of the transverse plate, and the inclination directions of the inclined grooves are symmetrically arranged, the movable plates are fixedly connected to the pull plates on the adjacent sides and pass through the inner side of the transverse groove, the pull plates are fixedly connected to the tops of the pull plates, and the push rods are inserted into the inner side of the inclined grooves.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention can quickly open the upper clamping plate to tighten and fix the inner side of the pallet through the arrangement of structures such as racks, gears and driving mechanisms, and insert the lower clamping plate into both sides of the center column of the pallet, so as to limit the lateral and longitudinal movement positions of the pallet, and can be folded and stored when not in use, thereby reducing the overall height of the four-way vehicle and improving the application range of the device.

[0018] 2. The present invention can adjust the limit position of the lower clamping plate according to the size of the center column of the pallet by setting structures such as screws, cross plates and inclined grooves, so that pallets of different specifications can be used, thereby improving the universal performance of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall appearance of the four-way pallet vehicle of the present invention;

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of the four-way pallet vehicle of the present invention after being disassembled;

[0021] Figure 3 The appended Figure 2A schematic diagram of the partially enlarged structure at center A;

[0022] Figure 4 It is a schematic diagram of the overall appearance structure of the driving mechanism of the present invention;

[0023] Figure 5 It is a schematic diagram of the partial appearance of the top box and the sliding frame of the present invention;

[0024] Figure 6 The appended Figure 5 A schematic diagram of the partially enlarged structure at B in the middle;

[0025] Figure 7 It is a schematic diagram of the overall appearance structure of the cylinder of the present invention;

[0026] Figure 8 It is a schematic diagram of the overall appearance structure of the movable plate of the present invention;

[0027] Fig. 9 It is a schematic diagram of the three-dimensional structure of the upper clamping plate and the sliding frame being separated according to the present invention;

[0028] Fig.10 The appended Fig. 9 Schematic diagram of the partial enlarged structure at point C in the middle.

[0029] In the figure: 1, vehicle body; 2, rectangular frame; 3, rectangular rod; 4, top box; 5, lifting mechanism; 6, top opening; 7, sliding frame; 8, upper clamping plate; 9, gear; 10, rack; 11, slide groove; 12, slide plate; 13, side plate; 14, groove; 15, roller; 16, bottom groove; 17, upper pull rope; 18, fixed plate; 19, winding roller; 20, upper plate; 21, upper spring; 22, driving motor; 23, driven bevel gear; 2 4. Driving bevel gear; 25. Guide plate; 26. Guide roller; 27. Limiting hole; 28. Lower spring; 29. ​​Release groove; 30. Round rod; 31. Moving groove; 32. Moving plate; 33. Cylinder; 34. Lower clamping plate; 35. Lower pull rope; 36. Limiting plate; 37. Pull block; 38. Positioning block; 39. Cross plate; 40. Screw; 41. Rotating block; 42. Inclined groove; 43. Pull plate; 44. Push rod; 45. Volute spring. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] like Figure 1-10 A pallet four-way vehicle shown in the figure comprises a vehicle body 1, which is mainly composed of a battery, a mother wheel group, a sub-wheel group and a chassis lifting assembly, which is a mature technology in the prior art and will not be described in detail here. A lifting mechanism 5 for lifting the pallet is provided on the vehicle body 1, and the lifting mechanism 5 is mainly driven by an electric telescopic cylinder to drive the lifting plate to move upward to realize the lifting function of the pallet. A top box 4 is fixedly connected to the top of the vehicle body 1, and the lifting mechanism 5 is arranged through the top of the top box 4. Top openings 6 are opened on both sides of the top of the top box 4. The setting of the top opening 6 avoids obstruction. In order to prevent the normal flipping of the upper clamping plate 8 and the lower clamping plate 34, the bottom end of the top box 4 and below the top opening 6 are slidably connected with a sliding frame 7, an upper clamping plate 8 is provided on the inner side of the sliding frame 7, gears 9 are fixedly connected on both sides of the upper clamping plate 8, and the gears 9 are rotatably connected to the inner side of the sliding frame 7 through a torsion spring, and the gears 9 are rotatably connected to the inner side of the sliding frame 7 through the torsion spring, so that the upper clamping plate 8 is driven to reset in the reverse direction by the torsion force of the torsion spring when resetting, and the rack 10 is driven to reset, and the racks 10 meshing with the gears 9 are slidably connected on both sides of the top of the sliding frame 7;

[0033] Slide grooves 11 are provided on both sides of the top of the sliding frame 7, and slide plates 12 are fixedly connected to the side walls of the rack 10 and located inside the slide grooves 11, and side plates 13 are fixedly connected to the side walls of the rack 10. A pair of grooves 14 are provided at both ends of the inner side of the top box 4, and rollers 15 are rotatably connected to the inner sides of the grooves 14. The setting of the rollers 15 guides the sliding direction of the upper pull rope 17. A bottom groove 16 is provided at the bottom end of the top box 4 and at a position corresponding to the groove 14. Through the bottom groove 1 6, the upper pull rope 17 can be stored to avoid hindering the normal movement of the sliding frame 7. The side wall of the side plate 13 and the upper pull rope 17 are fixedly connected above the groove 14. A pair of fixed plates 18 are fixedly connected to the middle position of the bottom end of the top box 4. A winding roller 19 is rotatably connected between the fixed plates 18. The other end of the upper pull rope 17 passes through the outer wall of the roller 15 and is fixedly connected to the outer wall of the winding roller 19. The fixed plate 18 is provided with a driving mechanism for driving the winding roller 19 to rotate;

[0034] A pair of upper plates 20 are fixedly connected to the bottom end of the top box 4, and a pair of upper springs 21 are fixedly connected between the upper plates 20 and the side walls of the sliding frame 7. The upper plates 20 and the upper springs 21 are arranged to facilitate pulling the sliding frame 7 to slide quickly for reset;

[0035] The driving mechanism includes a driving motor 22, which is fixedly connected to the bottom end of the top box 4. The side wall of the winding roller 19 passes through the fixed plate 18 and is fixedly connected to a driven bevel gear 23. The output end of the driving motor 22 passes through the top box 4 and is fixedly connected to a driving bevel gear 24 meshing with the driven bevel gear 23.

[0036] A pair of moving grooves 31 are provided at the top of the upper clamping plate 8, and a moving plate 32 is slidably connected to the inner side of the moving grooves 31. The top of the moving plate 32 is provided with an L-shaped groove, and a cylinder 33 is rotatably connected to the inner side of the L-shaped groove. A lower clamping plate 34 is fixedly connected to the side wall of the cylinder 33, and a lower pull rope 35 is wound around the outer wall of the cylinder 33. A limiting plate 36 is fixedly connected to the bottom end of the inner side of the sliding frame 7. The downward turning position of the upper clamping plate 8 can be limited by setting the limiting plate 36. A pair of pulling blocks 37 are slidably connected to the top of the limiting plate 36. One end of the lower pull rope 35 is fixedly connected to the outer wall of the cylinder 33, and the other end of the lower pull rope 35 is fixedly connected to the top of the pulling block 37.

[0037] The lower pull rope 35 is made of elastic material. After the lower clamping plate 34 is turned over in place, the lower pull rope 35 can be pulled to ensure the normal operation of the device without jamming. A positioning block 38 for limiting the turning position of the lower clamping plate 34 is fixedly connected to the inner side of the L-shaped groove. The positioning block 38 can limit the turning position of the lower clamping plate 34 to ensure the normal operation of the device. A volute spring 45 is fixedly connected to the inner side of the cylinder 33, and the other end of the volute spring 45 is fixedly connected to the inner side of the L-shaped groove. The volute spring 45 is convenient for driving the lower clamping plate 34 to reset.

[0038] During the use of the four-way pallet vehicle, the vehicle body 1 is moved to the bottom of the pallet on the logistics rack through the mother wheel group and the sub-wheel group, and then the lifting mechanism 5 is controlled to start to lift the pallet and the goods, so that the pallet leaves the logistics rack, and then the driving motor 22 can be controlled to start to drive the driving bevel gear 24 to rotate, thereby driving the meshing driven bevel gear 23 to rotate, and then driving the winding roller 19 to rotate, so as to achieve the winding of the two upper pull ropes 17, and then under the guidance of the roller 15, the upper pull rope 17 pulls the side plate 13 and the rack 10 to move to both sides, thereby driving the meshing gear 9 to rotate, and at the same time driving the upper clamping plate 8 to flip upward, and compressing the torsion spring between the gear 9 and the sliding frame 7;

[0039] At the same time, through the upward flipping of the upper clamping plate 8, since one end of the lower pull rope 35 on the lower clamping plate 34 is fixed to the pull block 37 on the sliding frame 7, the lower pull rope 35 will be gradually pulled out from the cylinder 33, and since the other end of the lower pull rope 35 is fixed to the cylinder 33, it will drive the cylinder 33 to rotate at the same time, thereby driving the lower clamping plate 34 to rotate and open the lower clamping plate 34. At the same time, since one end of the volute spring 45 is fixed to the inner side of the cylinder 33 and the other end is fixed to the inner side of the L-shaped groove, the volute spring 45 will be gradually compressed through the rotation of the cylinder 33, and then the lower clamping plate 34 will rotate to the side of the limiting plate 36 and stop flipping. At this time, the upper clamping plate 8 completes the flipping and is driven by the round rod 30 to squeeze the release groove 29 The rectangular rod 3 slides upward to release the restriction on the sliding position of the sliding frame 7, and the slide plate 12 moves to the side wall of the slide groove 11, and then the slide frame 7 is pushed to slide on the inside of the top box 4 under the action of the slide plate 12, and at the same time, the flipped upper clamping plate 8 and the lower clamping plate 34 are driven to move to both sides, and the upper spring 21 is gradually stretched, and then the upper clamping plate 8 moves to the two ends of the inner side of the pallet, and the lower clamping plate 34 is inserted on both sides of the center column of the pallet, thereby realizing the restriction of the horizontal and vertical sliding position of the pallet, and then the mother wheel group or the sub-wheel group can be controlled to start moving the pallet and the cargo to the specified position. When reaching the specified position, the drive motor 22 can be controlled to reverse, and the above operation is repeated in reverse to reset, and the upper clamping plate 8 and the lower clamping plate 34 are stored.

[0040] In order to improve the stability of the device during operation, the bottom grooves 16 on both sides are not on the same horizontal line, and the upper pull ropes 17 on both sides are fixedly connected to the upper and lower sides of the winding roller 19 respectively, so as to ensure that the upper pull ropes 17 on both sides can be wound on the winding roller 19 without interference. A pair of guide plates 25 are fixedly connected to the bottom end of the top box 4 and located above the bottom groove 16, and guide rollers 26 are rotatably connected between the guide plates 25. Through the arrangement of the guide plates 25 and the guide rollers 26, the sliding of the upper pull rope 17 can be guided to prevent the winding roller 19 from directly pulling out the upper pull rope 17, which will cause the upper pull rope 17 to contact the bottom of the sliding frame 7. Therefore, in the process of pulling the upper pull rope 17, the surface of the upper pull rope 17 will rub against the bottom of the sliding frame 7, thereby affecting the service life of the upper pull rope 17.

[0041] In order to ensure that the upper clamping plate 8 can be turned over normally, the outer walls of the sliding frame 7 are fixedly connected with rectangular frames 2 on both sides, the inner sides of the rectangular frames 2 are slidably connected with rectangular rods 3, and the bottom end of the top box 4 and the corresponding position of the rectangular rods 3 are provided with limiting holes 27, the bottoms of the rectangular rods 3 are inserted into the inner sides of the limiting holes 27, and the outer walls of the rectangular rods 3 and the bottoms of the rectangular frame 2 are fixedly connected with lower springs 28, the side walls of the rectangular rods 3 are provided with release grooves 29, and the top ends of the release grooves 29 are inclined, and the side away from the slide plate 12 is fixedly connected with round rods 30 for squeezing the inclined surfaces of the release grooves 29;

[0042] When the driving mechanism winds up the pull rope 17, the side plate 13 and the rack 10 are driven to move. During the turning process of the driving gear 9 and the upper clamping plate 8, the slide plate 12 on the side wall of the rack 10 is driven to slide inside the slide groove 11. At this time, the rectangular rod 3 on the side wall of the sliding frame 7 is inserted into the limiting hole 27, which limits the sliding position of the sliding frame 7, thereby ensuring that the rack 10 will not drive the sliding frame 7 to move during the turning process of the upper clamping plate 8, thereby affecting the normal turning of the upper clamping plate 8. Subsequently, when the upper clamping plate 8 is about to be turned over, the round rod 30 on the side wall of the slide plate 12 will move into the release groove 29, and then the round rod 30 will squeeze the inclined surface at the top of the release groove 29, so that The rectangular rod 3 slides upward and out of the limiting hole 27, and compresses the lower spring 28, so that the restriction on the sliding position of the sliding frame 7 can be released. Then, while releasing the limiting position of the sliding frame 7, the upper clamping plate 8 is flipped over, and the sliding plate 12 can push the inner side of the sliding groove 11 to drive the sliding frame 7 to move at the same time, so as to tighten and fix the inner side of the tray. The above operation is repeated in reverse when resetting. It should be noted here that since the sliding frame 7 slides in the top box 4, the sliding position of the sliding frame 7 can be limited by opening a sliding groove to ensure that the sliding frame 7 moves to the initial position when resetting, thereby ensuring that the rectangular rod 3 is normally inserted into the limiting hole 27, which is a mature technology in the prior art.

[0043] In order to be able to adjust the limit position of the lower clamping plate 34 according to the size of the center column of the pallet, a transverse groove is provided in the middle position of the top of the upper clamping plate 8, a transverse plate 39 is slidably connected to the inner side of the transverse groove, a screw 40 is rotatably connected to the inner side of the transverse groove, and the screw 40 passes through the threaded connection to the inner side wall of the transverse plate 39, the side wall of the screw 40 passes through the side wall of the upper clamping plate 8 and is fixedly connected to a rotating block 41, a pair of inclined grooves 42 are provided through the top of the transverse plate 39, and the inclined directions of the inclined grooves 42 are symmetrically arranged, the side close to the movable plate 32 is fixedly connected to a pull plate 43 and passes through the inner side of the transverse groove, the top of the pull plate 43 is fixedly connected to a push rod 44, and the push rod 44 is inserted into the inner side of the inclined groove 42;

[0044] Before the four-way vehicle is used, when the limit position of the lower clamping plate 34 needs to be adjusted, the screw 40 is driven to rotate by rotating the rotating block 41, thereby driving the threaded cross plate 39 to slide on the inside of the cross groove, thereby squeezing the push rod 44 to move through the inclined groove 42 on the cross plate 39, and then driving the pull plate 43 and the movable plate 32 to slide on the inside of the movable groove 31, thereby realizing the adjustment of the limit position of the lower clamping plate 34, and then the pull block 37 can be pushed to slide on the limiting plate 36 to move the pull block 37 to the position corresponding to the lower pull rope 35.

[0045] The basic principles, main features and advantages of the present invention are shown and described above.

[0046] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and the specification only describe the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. These changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A four-way pallet vehicle, comprising a vehicle body, on which is provided a lifting mechanism for lifting the pallet, characterized in that: The top of the car body is fixedly connected with a top box, and the jacking mechanism runs through the top of the top box, and top openings are opened on both sides of the top of the top box, and a sliding frame is slidably connected to the bottom end of the top box and located below the top opening, and an upper clamping plate is arranged on the inner side of the sliding frame, and gears are fixedly connected to the two sides of the upper clamping plate, and the gears are rotatably connected to the inner side of the sliding frame through a torsion spring, and racks meshing with the gears are slidably connected on both sides of the top of the sliding frame; sliding grooves are opened on both sides of the top of the sliding frame, and slide plates are fixedly connected to the side walls of the rack and located inside the slide grooves, and the side walls of the rack are fixedly connected to the side plates, a pair of grooves are opened at both ends of the inner side of the top box, and rollers are rotatably connected to the inner side of the grooves, and bottom grooves are opened at the bottom end of the top box and at positions corresponding to the grooves, and upper pull ropes are fixedly connected to the side walls of the side plates and located above the grooves, and a pair of fixed plates are fixedly connected to the middle position of the bottom end of the top box, and a winding roller is rotatably connected between the fixed plates, and the other end of the upper pull rope passes through the outer wall of the roller and is fixedly connected to the outer wall of the winding roller. The fixing plate is provided with a driving mechanism for driving the winding roller to rotate; a rectangular frame is fixedly connected to both sides of the outer wall of the sliding frame, and a rectangular rod is slidably connected to the inner side of the rectangular frame. Limit holes are provided at the bottom end of the top box and at positions corresponding to the rectangular rods, and the bottom of the rectangular rods are inserted into the inner sides of the limit holes. A lower spring is fixedly connected between the outer wall of the rectangular rod and the bottom of the rectangular frame, a release groove is provided on the side wall of the rectangular rod, and the top of the release groove is inclined, and a round rod for squeezing the inclined surface of the release groove is fixedly connected on the side away from the slide plate; a pair of moving grooves is provided at the top of the upper clamping plate, and a moving plate is slidably connected to the inner side of the moving groove, and an L-shaped groove is provided on the top of the moving plate, and a cylinder is rotatably connected to the inner side of the L-shaped groove, and the side wall of the cylinder is fixedly connected to the lower clamping plate, and a lower pull rope is wound around the outer wall of the cylinder, and the inner bottom end of the sliding frame is fixedly connected to a limiting plate, and a pair of pull blocks are slidably connected to the top of the limiting plate, and one end of the lower pull rope is fixedly connected to the outer wall of the cylinder, and the other end of the lower pull rope is fixedly connected to the top of the pull block.

2. A four-way pallet vehicle according to claim 1, characterized in that: A pair of upper plates are fixedly connected to the bottom end of the top box, and a pair of upper springs are fixedly connected between the upper plates and the side walls of the sliding frame.

3. A pallet four-way vehicle according to claim 1, characterized in that: The driving mechanism includes a driving motor, which is fixedly connected to the bottom end of the top box. The side wall of the winding roller is fixedly connected with a driven bevel gear through a fixed plate, and the output end of the driving motor is fixedly connected with a driving bevel gear meshing with the driven bevel gear through the top box.

4. A four-way pallet vehicle according to claim 1, characterized in that: The bottom grooves on both sides are not on the same horizontal line, the upper pull ropes on both sides are fixedly connected to the upper and lower sides of the winding roller respectively, a pair of guide plates are fixedly connected at the bottom end of the top box and above the bottom grooves, and guide rollers are rotatably connected between the guide plates.

5. The four-way pallet vehicle according to claim 1, characterized in that: The lower pull rope is made of elastic material, a positioning block for limiting the flipping position of the lower clamping plate is fixedly connected to the inner side of the L-shaped groove, a volute spring is fixedly connected to the inner side of the cylinder, and the other end of the volute spring is fixedly connected to the inner side of the L-shaped groove.

6. A four-way pallet vehicle according to claim 1, characterized in that: A transverse groove is provided in the middle position of the top of the upper splint, a transverse plate is slidably connected to the inner side of the transverse groove, a screw is rotatably connected to the inner side of the transverse groove, and the screw passes through a threaded connection to the inner side wall of the transverse plate, the side wall of the screw passes through the side wall of the upper splint and is fixedly connected to a rotating block, a pair of inclined grooves are provided through the top of the transverse plate, and the inclination directions of the inclined grooves are symmetrically arranged, a pull plate is fixedly connected to the adjacent side of the moving plate and passes through the inner side of the transverse groove, a push rod is fixedly connected to the top of the pull plate, and the push rod is inserted into the inner side of the inclined groove.

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