Multi-layer material storage and transportation vehicle and method

Abstract

The multi-layer material storage and transportation vehicle comprises a carrying vehicle body, a container is arranged on the carrying vehicle body, a container door is arranged at an opening of the container, and threaded rods are fixedly connected to the positions, close to the two ends of the two side faces, of the interior of the container; a bottom frame, a middle frame and a top frame are sequentially arranged between the threaded rods on the two sides from bottom to top, the bottom frame is fixedly connected with the lower end face in the container, and lifting mechanisms matched with the threaded rods for lifting are arranged on the two sides of the middle frame and the two sides of the top frame correspondingly. The top frame and the middle frame can be independently lifted through the arranged lifting mechanism, so that the middle frame and the top frame can be lowered during unloading or loading, and meanwhile, unloading and loading of goods can be facilitated in cooperation with the feeding mechanism; the problem that in the prior art, the gradient of the discharging guide plate is too large when materials at the high position are unloaded is solved.

Description

Technical Field

[0001] The invention relates to the technical field of transport vehicles, in particular to a multi-layer material storage and transportation vehicle and a method. Background Art

[0002] Warehousing logistics is the process of storing, keeping, loading and unloading, transporting and distributing goods by using self-built or leased warehouses and sites. In the process of logistics transportation, material storage and transportation vehicles are needed to transport and transfer materials and other goods.

[0003] For example, a logistics warehousing and transportation device proposed in the prior art CN111776563B includes a bottom plate, moving wheels, a storage frame, a conveyor belt, a transmission roller, a transmission motor, an introduction plate and a slide plate. The device can achieve multi-layer storage of materials through the multi-layer structure, and a transmission structure is set to facilitate the loading and unloading of goods.

[0004] However, the existing technology still has certain defects in practical application. Although the existing technology is equipped with a transmission mechanism to facilitate the loading and unloading of materials, when materials are loaded and unloaded at high levels, due to the relatively high height of the high levels, the slope of the guide plate for discharging materials is too large during unloading. When unloading materials, the materials slide down too fast, which can easily cause the materials to be damaged by impact. At the same time, the large slope is also very inconvenient when loading materials. In response to the above problems, we provide a multi-layer material storage and transportation vehicle and method to solve the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide a multi-layer material storage and transportation vehicle and method to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A multi-layer material storage and transportation vehicle comprises a transport vehicle, wherein a cargo box is arranged on the transport vehicle, a door is arranged at the opening of the cargo box, threaded rods are fixedly connected to the positions near both ends of the two side surfaces of the cargo box, a bottom frame, an intermediate frame and a top frame are arranged in sequence from bottom to top between the threaded rods on both sides, the bottom frame is fixedly connected to the lower end surface of the cargo box, and lifting mechanisms are arranged on both sides of the intermediate frame and the top frame for lifting and lowering in cooperation with the threaded rods.

[0008] The bottom frame, the middle frame and the top frame are all provided with a conveying mechanism for conveying materials;

[0009] The positions near the two sides of the opening inside the cargo box are fixedly connected to the limited vertical grooves, and the two limited vertical grooves are slidably connected to the inside of the two lifting blocks, and a feeding mechanism for assisting unloading or loading is provided between the two lifting blocks;

[0010] Lifting mechanisms for adjusting the height of the lifting blocks are also provided on both sides of the cargo box.

[0011] As a further solution of the present invention: The lifting mechanism includes a fixed block, a threaded sleeve is rotatably connected inside the fixed block, a first gear is fixedly connected to the upper end of the threaded sleeve, a driving motor is fixedly connected to one side of the fixed block, and a second gear is installed at the output end of the driving motor.

[0012] As a further solution of the present invention: The conveying mechanism includes driving rollers, the driving rollers are respectively rotatably connected to positions at both ends of the mounting frame, a first conveyor belt is installed between the two driving rollers, and a first reduction motor for driving the driving rollers to rotate is provided at one end of the top frame.

[0013] As a further solution of the present invention: The feeding mechanism includes a connecting shaft, the connecting shaft is installed at a position between the two lifting blocks, a mounting frame is rotatably connected to the two connecting shafts, a belt roller is rotatably connected to one end of the mounting frame away from the connecting shaft, a rotating roller is rotatably connected to the position of the connecting shaft inside the mounting frame, a second conveyor belt is installed between the belt roller and the rotating roller, a second reduction motor for driving the belt roller to rotate is further provided at one end of the mounting frame, and a pulling mechanism for pulling up or lowering the mounting frame is further provided on the cargo box.

[0014] As a further solution of the present invention: The pulling mechanism includes an electric hoist, the electric hoist is installed at a position on one side of the upper end face of the cargo box near the box door, and the traction rope of the electric hoist is connected to one end of the mounting frame away from the cargo box.

[0015] As a further solution of the present invention: The lifting mechanism includes a second hydraulic cylinder, the second hydraulic cylinder is fixedly connected to the position of the cargo box above the lifting block, a second piston rod is slidably connected inside the second hydraulic cylinder, a first spring is installed in the rodless cavity of the second hydraulic cylinder, the lower end of the second piston rod is fixedly connected to the lifting block, an L-shaped pressing block is fixedly connected to one side of the top frame, a flat pressing block is fixedly connected to one side of the middle frame, and a pushing component for driving the second piston rod to move is provided on the bottom frame.

[0016] As a further solution of the present invention: The pushing component includes a mounting seat, which is fixedly connected to one side of the bottom frame at a position below the L-shaped pressing block and the flat pressing block. Both sides of the mounting seat are fixedly connected with first hydraulic cylinders. The positions of the two first hydraulic cylinders correspond to the flat pressing block and the L-shaped pressing block respectively. A first piston rod is slidably connected inside each of the first hydraulic cylinders. The upper ends of the first piston rods are fixedly connected with pressing discs. The bottom of the rodless cavity of the first hydraulic cylinder is communicated with a hydraulic pipe. The end of the hydraulic pipe far away from the first hydraulic cylinder is communicated with the bottom of the rod chamber of the second hydraulic cylinder. The rodless cavity of the first hydraulic cylinder and the rod chamber of the second hydraulic cylinder are both filled with hydraulic oil. A second spring is disposed through the position of the first piston rod between the pressing disc and the first hydraulic cylinder.

[0017] As a further solution of the present invention: Exhaust holes are provided at the upper ends of the rod chambers of the first hydraulic cylinders and the upper ends of the rodless cavities of the second hydraulic cylinders.

[0018] As a further solution of the present invention: A plurality of idler rollers are provided inside the mounting frame, the intermediate frame, the top frame and the bottom frame.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. The lifting mechanism provided by the present invention can lift the top frame and the intermediate frame separately, so that the intermediate frame and the top frame can be lowered during unloading or loading. At the same time, with the cooperation of the feeding mechanism, it is convenient for unloading and loading of goods, avoiding the problem of too large slope of the discharge guide plate when unloading high-place materials in the prior art.

[0021] 2. The lifting mechanism provided by the present invention can automatically match the height of the feeding mechanism with the intermediate frame, the top frame and the bottom frame during use. During use, when the intermediate frame or the top frame descends, the height of the feeding mechanism will automatically rise so that the upper end interface of the feeding mechanism matches the intermediate frame and the top frame, facilitating unloading or loading. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the present invention.

[0023] Figure 2 is a schematic structural diagram of the other side of the present invention.

[0024] Figure 3 is a schematic internal structural diagram of the cargo box of the present invention.

[0025] Figure 4 is a schematic structural diagram of the traction mechanism of the present invention.

[0026] Figure 5 is a schematic structural diagram of the lifting mechanism of the present invention.

[0027] Figure 6 Structural schematic diagram of the conveying mechanism in the present invention

[0028] Figure 7 Structural schematic diagram of the feeding mechanism in the present invention.

[0029] Figure 8 Partial structural schematic diagram of the feeding mechanism in the present invention.

[0030] Figure 9 Structural schematic diagram of the lifting mechanism in the present invention.

[0031] Wherein: 100, carrier vehicle;

[0032] 200, cargo box; 201, threaded rod; 202, bottom frame; 203, middle frame; 204, top frame; 205, limiting vertical groove; 206, lifting block;

[0033] 300, box door;

[0034] 400, conveying mechanism; 401, driving roller; 402, first conveyor belt; 403, first reduction motor;

[0035] 500, lifting mechanism; 501, first hydraulic cylinder; 502, second hydraulic cylinder; 503, mounting seat; 504, first piston rod; 505, pressing disc; 506, hydraulic pipe; 507, flat pressing block; 508, L-shaped pressing block; 509, second piston rod; 510, first spring; 511, second spring;

[0036] 600, feeding mechanism; 601, mounting frame; 602, belt roller; 603, second reduction motor; 604, second conveyor belt; 605, connecting shaft; 606, rotating roller;

[0037] 700, lifting mechanism; 701, fixed block; 702, first gear; 703, threaded sleeve; 704, second gear; 705, driving motor;

[0038] 801, electric hoist. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] Please refer to Figures 1 - 9, in an embodiment of the present invention, a multi-layer material storage and transportation vehicle includes a carrier vehicle 100, a cargo box 200 is provided on the carrier vehicle 100, a box door 300 is provided at the opening of the cargo box 200. At positions near both ends of the two side surfaces inside the cargo box 200, threaded rods 201 are fixedly connected. A bottom frame 202, an intermediate frame 203, and a top frame 204 are sequentially arranged from bottom to top between the two threaded rods 201. The bottom frame 202 is fixedly connected to the lower end surface inside the cargo box 200. Lifting mechanisms 700 for cooperating with the threaded rods 201 for lifting are provided on both sides of the intermediate frame 203 and the top frame 204. Through the provided multi-layer structure, the placement and classification of materials can be facilitated. The provided conveying mechanism 400 can facilitate the discharge and feeding of materials, and is convenient to use.

[0041] The lifting mechanism 700 includes a fixed block 701, a threaded sleeve 703 is rotatably connected inside the fixed block 701, a first gear 702 is fixedly connected to the upper end of the threaded sleeve 703, a driving motor 705 is fixedly connected to one side of the fixed block 701, and a second gear 704 is installed at the output end of the driving motor 705; during operation, the second gear 704 driven by the driving motor 705 rotates, the second gear 704 drives the first gear 702 to rotate, the first gear 702 drives the threaded sleeve 703 to rotate, and the threaded sleeve 703 cooperates with the threaded rod 201 to realize the lifting function.

[0042] Conveying mechanisms 400 for conveying materials are provided inside the bottom frame 202, the intermediate frame 203, and the top frame 204; the conveying mechanism 400 includes a driving roller 401, the driving rollers 401 are respectively rotatably connected at positions at both ends of the mounting frame, a first conveyor belt 402 is installed between the two driving rollers 401, and a first reduction motor 403 for driving the driving roller 401 to rotate is provided at one end of the top frame 204; during operation, the first reduction motor 403 drives the driving roller 401 at one end to rotate, and the driving roller 401 rotates to drive the first conveyor belt 402 to operate, thereby realizing the conveying of materials.

[0043] On both sides of the interior of the cargo box 200 near the opening, there are fixedly connected limit vertical grooves 205. Inside both limit vertical grooves 205, there are slidingly connected lifting blocks 206. Between the two lifting blocks 206, there is a feeding mechanism 600 for assisting in unloading or loading goods. The feeding mechanism 600 includes a connecting shaft 605. The connecting shaft 605 is installed between the two lifting blocks 206. On the two connecting shafts 605, there is a rotatably connected mounting frame 601. At one end of the mounting frame 601 away from the connecting shaft 605, there is a rotatably connected belt roller 602. At the position of the connecting shaft 605 inside the mounting frame 601, there is a rotatably connected rotating roller 606. A second conveyor belt 604 is installed between the belt roller 602 and the rotating roller 606. At one end of the mounting frame 601, there is also a second reduction motor 603 for driving the belt roller 602 to rotate. On the cargo box 200, there is also a pulling mechanism for pulling up or lowering the mounting frame 601.

[0044] During operation, the second reduction motor 603 can drive the belt roller 602 to rotate. The rotation of the belt roller 602 can drive the second conveyor belt 604 to operate. The operation of the second conveyor belt 604 can achieve the conveying of materials. The connecting shaft 605 is rotatably connected to the mounting frame 601, which can make the angle adjustment of the mounting frame 601 not affected by the connecting shaft 605. At the same time, the connecting shaft 605 is rotatably connected to the rotating roller 606, so that the rotating roller 606 can still rotate normally after the angle of the mounting frame 601 is adjusted.

[0045] The pulling mechanism includes an electric hoist 801. The electric hoist 801 is installed on one side of the upper end face of the cargo box 200 near the box door 300. The towing rope of the electric hoist 801 is connected to the end of the mounting frame 601 away from the cargo box 200. When it is necessary to retract the feeding mechanism 600, the electric hoist 801 can be started. The electric hoist 801 drives the mounting frame 601 to rotate around the connecting shaft 605, thereby retracting the mounting frame 601.

[0046] On both sides inside the cargo box 200, there is also a lifting mechanism 500 for adjusting the height of the lifting block 206; the lifting mechanism 500 includes a second hydraulic cylinder 502, the second hydraulic cylinder 502 is fixedly connected to the position of the cargo box 200 above the lifting block 206, a second piston rod 509 is slidably connected inside the second hydraulic cylinder 502, a first spring 510 is installed in the rodless cavity of the second hydraulic cylinder 502, the lower end of the second piston rod 509 is fixedly connected to the lifting block 206, an L-shaped pressing block 508 is fixedly connected to one side of the top frame 204, a flat pressing block 507 is fixedly connected to one side of the middle frame 203, and a pushing component for driving the movement of the second piston rod 509 is provided on the bottom frame 202. During operation, the pushing component injects or extracts hydraulic oil into the second hydraulic cylinder 502 to control the movement of the second piston rod 509. The movement of the second piston rod 509 can drive the movement of the lifting block 206, thereby driving the feeding mechanism 600 to rise or fall.

[0047] The pushing component includes a mounting seat 503, the mounting seat 503 is fixedly connected to the position on one side of the bottom frame 202 below the L-shaped pressing block 508 and the flat pressing block 507, both sides of the mounting seat 503 are fixedly connected with first hydraulic cylinders 501, the positions of the two first hydraulic cylinders 501 correspond to the flat pressing block 507 and the L-shaped pressing block 508 respectively, first piston rods 504 are slidably connected inside the first hydraulic cylinders 501, the upper ends of the first piston rods 504 are fixedly connected with pressing plates 505, the bottom of the rodless cavity of the first hydraulic cylinder 501 is communicated with a hydraulic pipe 506, and the end of the hydraulic pipe 506 away from the first hydraulic cylinder 501 is communicated with the bottom of the rod cavity of the second hydraulic cylinder 502. The rodless cavities of the first hydraulic cylinders 501 and the rod cavity of the second hydraulic cylinder 502 are filled with hydraulic oil, and second springs 511 are respectively arranged at the positions of the first piston rods 504 between the pressing plates 505 and the first hydraulic cylinders 501; exhaust holes are respectively opened at the upper ends of the rod cavities of the first hydraulic cylinders 501 and the upper ends of the rodless cavities of the second hydraulic cylinders 502; during operation, when the middle frame 203 descends, the flat pressing block 507 will press on the corresponding first piston rod 504, and the hydraulic oil in the corresponding first piston rod 504 will be pressed into the second hydraulic cylinder 502. At this time, the second piston rod 509 will be lifted upward under the action of the hydraulic pressure, driving the lifting block 206 and the feeding mechanism 600 to move upward to be flush with the middle frame 203, which is convenient for material transportation. When the top frame 204 descends, it is the same as when the middle frame 203 descends. After the middle frame 203 and the top frame 204 rise, the feeding mechanism 600 will descend and reset under the action of the gravity of the feeding mechanism 600 and the first spring 510 inside the second hydraulic cylinder 502.

[0048] The installation frame 601, the middle frame 203, the top frame 204 and the bottom frame 202 are all provided with several idlers. The arranged idlers can improve the load-bearing capacity of the conveyor belt and prevent the conveyor belt from collapsing under the action of heavy objects.

[0049] The working principle of the present invention is as follows: During operation, when loading goods, first lower the middle frame 203 and the top frame 204 to the lowest position. After the middle frame 203 and the top frame 204 are lowered to the lowest position, the L-shaped pressing block 508 and the flat pressing block 507 will press on the two pressure plates 505, press the hydraulic oil in the first hydraulic cylinder 501 into the second hydraulic cylinder 502, and then move the second piston rod 509 upward to move the feeding mechanism 600 to a position corresponding to the top frame 204. Then, load the top frame 204 through the feeding mechanism 600 and the conveying mechanism 400. After the top frame 204 is loaded, move upward and reset. Then, one of the two first hydraulic cylinders 501 loses the pushing pressure and resets, causing the hydraulic oil in the second hydraulic cylinder 502 on one side to decrease, so that the feeding mechanism 600 descends to correspond to the middle frame 203. Then, goods can be loaded onto the middle frame 203. After loading is completed, the middle frame 203 resets upward. At the same time, the first hydraulic cylinder 501 pressed by the flat pressing block 507 resets, the hydraulic oil in the second hydraulic cylinder 502 is emptied, and the feeding mechanism 600 drops to the lowest position to match the bottom frame 202. At this time, goods can be loaded onto the bottom frame 202. After the goods are loaded, retract the feeding mechanism 600 through the pulling mechanism, and then close the box door 300 for transportation. When unloading, unload the bottom frame 202 first, then the middle frame 203, and finally the top frame 204 in sequence. The corresponding working principle is the same as the above, and will not be elaborated here.

[0050] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Although this specification is described according to embodiments, not every embodiment only contains one technical solution. The narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-layer material storage and transportation vehicle, comprising a carrier vehicle (100), a cargo box (200) is provided on the carrier vehicle (100), and a box door (300) is provided at the opening of the cargo box (200), characterized in that, On both sides of the interior of the cargo box (200) near the two ends of the side faces, threaded rods (201) are fixedly connected. Between the two threaded rods (201), a bottom frame (202), an intermediate frame (203), and a top frame (204) are arranged in sequence from bottom to top. The bottom frame (202) is fixedly connected to the lower end face inside the cargo box (200). On both sides of the intermediate frame (203) and the top frame (204), there are lifting mechanisms (700) that cooperate with the threaded rods (201) for lifting and lowering. Inside the bottom frame (202), the intermediate frame (203), and the top frame (204), there are conveyor mechanisms (400) for transporting materials. On both sides of the interior of the cargo box (200) near the opening, limit vertical grooves (205) are fixedly connected. Inside the two limit vertical grooves (205), lifting blocks (206) are slidably connected. Between the two lifting blocks (206), there is a feeding mechanism (600) for assisting in unloading or loading goods. On both sides inside the cargo box (200), there is also a lifting mechanism (500) for adjusting the height of the lifting blocks (206).

2. The multi-layer material storage and transportation vehicle according to claim 1, wherein, The lifting mechanism (700) includes a fixed block (701). Inside the fixed block (701), a threaded sleeve (703) is rotatably connected. The upper end of the threaded sleeve (703) is fixedly connected to a first gear (702). On one side of the fixed block (701), a driving motor (705) is fixedly connected. The output end of the driving motor (705) is equipped with a second gear (704).

3. The multi-layer material storage and transportation vehicle according to claim 1, wherein, The conveyor mechanism (400) includes transmission rollers (401). The transmission rollers (401) are respectively rotatably connected to the two ends of the mounting frame. Between the two transmission rollers (401), a first conveyor belt (402) is installed. At one end of the top frame (204), there is a first reduction motor (403) for driving the transmission rollers (401) to rotate.

4. A multi-layer material storage and transportation vehicle according to claim 1, wherein, The feeding mechanism (600) includes a connecting shaft (605). The connecting shaft (605) is installed between the two lifting blocks (206). On the two connecting shafts (605), a mounting frame (601) is rotatably connected. At the end of the mounting frame (601) away from the connecting shaft (605), a belt roller (602) is rotatably connected. Inside the mounting frame (601) where the connecting shaft (605) is located, a rotating roller (606) is rotatably connected. Between the belt roller (602) and the rotating roller (606), a second conveyor belt (604) is installed. At one end of the mounting frame (601), there is also a second reduction motor (603) for driving the belt roller (602) to rotate. On the cargo box (200), there is also a pulling mechanism for pulling up or lowering the mounting frame (601).

5. A multi-layer material storage and transportation vehicle according to claim 4, characterized in that, The pulling mechanism includes an electric hoist (801). The electric hoist (801) is installed on one side of the upper end face of the cargo box (200) near the door (300). The towing rope of the electric hoist (801) is connected to the end of the mounting frame (601) away from the cargo box (200).

6. The multi-layer material storage and transportation vehicle according to claim 4, characterized in that, The lifting mechanism (500) includes a second hydraulic cylinder (502) fixedly connected to the cargo box (200) above the lifting block (206). A second piston rod (509) is slidably connected inside the second hydraulic cylinder (502). A first spring (510) is installed in the rodless cavity of the second hydraulic cylinder (502). The lower end of the second piston rod (509) is fixedly connected to the lifting block (206). An L-shaped pressing block (508) is fixedly connected to one side of the top frame (204), and a flat pressing block (507) is fixedly connected to one side of the middle frame (203). A pushing assembly for driving the movement of the second piston rod (509) is provided on the bottom frame (202).

7. The multi-layer material storage and transportation vehicle according to claim 6, characterized in that, The pushing assembly includes a mounting seat (503) fixedly connected to one side of the bottom frame (202) below the L-shaped pressing block (508) and the flat pressing block (507). First hydraulic cylinders (501) are fixedly connected to both sides of the mounting seat (503). The positions of the two first hydraulic cylinders (501) correspond to the flat pressing block (507) and the L-shaped pressing block (508) respectively. First piston rods (504) are slidably connected inside the first hydraulic cylinders (501). Pressing discs (505) are fixedly connected to the upper ends of the first piston rods (504). The bottom of the rodless cavity of the first hydraulic cylinder (501) is communicated with a hydraulic pipe (506). The end of the hydraulic pipe (506) away from the first hydraulic cylinder (501) is communicated with the bottom of the rod chamber of the second hydraulic cylinder (502). The rodless cavities of the first hydraulic cylinders (501) and the rod chambers of the second hydraulic cylinder (502) are filled with hydraulic oil. Second springs (511) are disposed through the positions of the first piston rods (504) between the pressing discs (505) and the first hydraulic cylinders (501).

8. A multi-layer material storage and transportation vehicle according to claim 7, characterized in that, Exhaust holes are provided at the upper ends of the rod chambers of the first hydraulic cylinders (501) and the upper ends of the rodless cavities of the second hydraulic cylinders (502).

9. A multi-layer material storage and transportation vehicle according to claim 4, characterized in that, Several idler rollers are provided inside the mounting frame (601), the middle frame (203), the top frame (204) and the bottom frame (202).

10. A multi-layer material storage and transportation vehicle and method according to any one of claims 1-9, characterized in that, It includes the following steps: Step 1: During operation, when loading goods, first lower the middle frame (203) and the top frame (204) to the lowest position; Step 2: After the intermediate frame (203) and the top frame (204) are lowered to the lowest position, the L-shaped pressing block (508) and the flat pressing block (507) press on the two pressing plates (505), forcing the hydraulic oil inside the first hydraulic cylinder (501) into the second hydraulic cylinder (502). Then, the second piston rod (509) moves upward, causing the feeding mechanism (600) to move to a position corresponding to the top frame (204). Then, through the feeding mechanism (600) and the conveying mechanism (400), loading is carried out onto the top frame (204). After the loading of the top frame (204) is completed, it moves upward to reset. Then, one of the two first hydraulic cylinders (501) loses the pushing pressure and resets, causing the hydraulic oil inside the second hydraulic cylinder (502) on one side to decrease, resulting in the feeding mechanism (600) descending to correspond to the intermediate frame (203). Then, goods can be loaded onto the intermediate frame (203). After the loading is completed, the intermediate frame (203) moves upward to reset. At the same time, the first hydraulic cylinder (501) pressed by the flat pressing block (507) resets, the hydraulic oil inside the second hydraulic cylinder (502) is emptied, and the feeding mechanism (600) drops to the lowest position to match the bottom frame (202). At this time, goods can be loaded onto the bottom frame (202); Step 3: After the goods loading is completed, the feeding mechanism (600) is retracted through the pulling mechanism, and then the box door (300) is closed for transportation. When unloading, unload the bottom frame (202) first, then the intermediate frame (203), and finally the top frame (204). Unload in this order. The corresponding working principle is the same as above and will not be elaborated here.

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