Van loading and unloading equipment and using method thereof

Abstract

The invention discloses van loading and unloading equipment and a using method thereof, and relates to the technical field of vehicle-mounted automatic loading and unloading. The device comprises two workbenches, a conveying belt is arranged between the two workbenches, the conveying belt is rotationally connected with a second connecting shaft through a first connecting shaft, the two ends of the first connecting shaft are rotationally installed on the two workbenches, sliding blocks are fixedly installed at the two ends of the second connecting shaft correspondingly, and the two sliding blocks are slidably connected to sliding grooves correspondingly; the sliding groove is formed in the workbench, and the two sliding blocks are each fixedly provided with one end of a telescopic rod. The driving air cylinder drives the frame and the rolling wheels to push the conveying belt to stretch out and draw back, and the equipment can be flexibly matched with different sizes of cargo carriages through the design. During loading and unloading, the conveying belt can extend into the compartment, goods can be directly carried between the conveying belt and the compartment, the manual carrying distance and difficulty are greatly reduced, loading and unloading convenience and efficiency are remarkably improved, and time and labor cost are effectively saved.

Description

Technical Field

[0001] This invention belongs to the field of vehicle-mounted automatic loading and unloading technology, and specifically relates to a loading and unloading device for a van and its usage method. Background Technology

[0002] Box truck loading and unloading equipment, a highly efficient tool in the logistics field, is a specialized device designed using mechanized, automated, or semi-automated technologies to enable the rapid and safe transfer of goods between the box truck compartment and the ground, warehouses, and even other means of transport. It not only simplifies the loading and unloading process but also covers the entire operation from lifting and handling to precise positioning of goods through precise control. Whether it's heavy cargo or fragile items, it can easily complete space transfers, greatly improving operational efficiency and safety. In key areas such as logistics, warehousing, and distribution, box truck loading and unloading equipment has become an indispensable core piece of equipment.

[0003] Currently, the practical application of box truck loading and unloading equipment faces a significant problem. Due to the diverse specifications of box trucks on the market and the substantial differences in truck bed lengths, existing loading and unloading equipment lacks sufficient flexibility and versatility in its design. This results in the equipment being unable to accurately adapt to truck beds of different lengths during actual operation, not only affecting loading and unloading efficiency but also potentially causing safety hazards due to poor fit, thus bringing numerous inconveniences to logistics and transportation work. Summary of the Invention

[0004] In view of the problems in the related technologies, the present invention proposes a loading and unloading equipment for vans and a method for using the same, so as to overcome the above-mentioned technical problems existing in the existing related technologies.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a loading and unloading device for a van, comprising two workbenches arranged parallel to each other and opposite to each other. A conveyor belt is positioned between the two workbenches, and the conveyor belt is rotatably connected by a first connecting shaft and a second connecting shaft. The first connecting shaft has two ends rotatably mounted on the two workbenches, providing stable support and a base for the conveyor belt's rotation. Sliding blocks are fixedly mounted on both ends of the second connecting shaft, and both sliding blocks are slidably connected to a slide groove on the workbenches. This design allows the second connecting shaft to move along the slide groove. One end of a telescopic rod is fixedly mounted on each of the two sliding blocks, and the other end of the telescopic rod is fixedly mounted on the inner wall of the slide groove. A return spring is fitted onto the telescopic rod. Under the action of a drive cylinder, the conveyor belt can be extended or shortened by moving the second connecting shaft, and the return spring helps the conveyor belt return to its original shape. The main purpose is to allow the conveyor belt to extend into the interior of the van compartment, facilitating the transportation of goods. The conveyor belt rests against the rollers below, which are rotatably mounted on the frame. The frame is fixedly connected to the output end of the drive cylinder, which is fixedly mounted on the connecting plate. The connecting plate is fixedly mounted between the two workbenches. By extending and retracting the drive cylinder, the rollers can be moved up and down, thereby adjusting the tension and length of the conveyor belt.

[0006] Furthermore, the output end of a first motor is fixedly installed at one end of the first connecting shaft. The first motor is fixedly installed on one of the workbenches. Driven by the first motor, the first connecting shaft can be rotated, thereby driving the conveyor belt to operate and realizing the transportation of goods.

[0007] Furthermore, each of the two workbenches has a slot at one end, and a connecting rod is rotatably installed inside the slot. A guide rod is fixedly installed on the connecting rod, which is used to guide the goods to be accurately placed on the conveyor belt to ensure smooth transport of goods.

[0008] Furthermore, a torsion spring is provided between the connecting rod and the worktable, and a first transmission wheel is fixedly installed at the end of the connecting rod away from the guide rod. The first transmission wheel is connected to a second transmission wheel via a transmission belt. The presence of the torsion spring allows the guide rod to return to its initial position when no external force is applied.

[0009] Furthermore, the second transmission wheel is fixedly mounted on the threaded cylinder, the threaded cylinder is rotatably mounted on the fixed plate, and the fixed plate is fixedly mounted on one of the workbenches. The threaded cylinder can be driven to rotate by the transmission belt.

[0010] Furthermore, the threaded cylinder is threadedly connected to a first threaded rod, and a cleaning brush is rotatably mounted on the end of the first threaded rod away from the threaded cylinder. The cleaning brush is slidably connected between two workbenches, and the cleaning brush is in contact with the surface of the conveyor belt. When the threaded cylinder rotates, it can drive the first threaded rod to move, thereby causing the cleaning brush to move on the surface of the conveyor belt to clean the conveyor belt and keep the conveyor belt clean.

[0011] Furthermore, a lifting mechanism is provided below both workbenches. The lifting mechanism includes a first rod fixedly installed on the workbench and a second rod slidably connected inside the first rod. The height of the workbench can be adjusted by sliding the first rod inside the second rod.

[0012] Furthermore, a second threaded rod is rotatably mounted inside the second rod, and the second threaded rod is threadedly connected to the first rod. A worm gear is fixedly mounted on the second threaded rod, and the worm gear meshes with a worm. The worm is rotatably mounted on the second rod, and the output end of a second motor is fixedly mounted on one end of the worm. The second motor is fixedly mounted on the second rod, and the second motor drives the worm to rotate, which in turn drives the worm gear to rotate, thereby causing the second threaded rod to rotate, realizing the lifting and lowering of the first rod, and thus adjusting the height of the worktable.

[0013] Furthermore, each of the two workbenches has a placement slot at the end furthest from the guide rod. The placement slot is used to place the equipment on a van. When the equipment is loading and unloading, the placement slot at one end of the workbench can be placed on the edge of the van, so that the equipment is securely connected to the van and the goods are easy to load and unload.

[0014] The present invention has the following beneficial effects: 1. This van loading and unloading equipment uses a drive cylinder to move the frame and rollers, which in turn extends or shortens the conveyor belt. This design allows the equipment to flexibly adapt to vans of different sizes. During loading and unloading, the conveyor belt can extend into the interior of the van, facilitating direct handling of goods between the conveyor belt and the van. This reduces the distance and difficulty of manual handling, greatly improves the convenience and efficiency of loading and unloading, and effectively saves time and labor costs. 2. The equipment is equipped with guide rods and cleaning brushes. When goods are placed in the slot, the guide rods rotate under the push of the goods, guiding them accurately into the conveyor belt, ensuring smooth loading and unloading, and avoiding problems caused by misplacement. Simultaneously, the rotation of the guide rods drives a series of transmission components, causing the cleaning brushes to slide on the conveyor belt surface, promptly removing debris, keeping the conveyor belt clean, preventing debris from affecting cargo transportation and normal equipment operation, and improving the stability and reliability of the equipment. 3. The lifting mechanism is designed to allow for adjustment of the work platform height to accommodate vans of varying heights. A second motor drives the worm gear, worm wheel, and second threaded rod to rotate, causing the first linkage to move up and down, thus achieving precise adjustment of the work platform height and enhancing the equipment's adaptability to different vans. Furthermore, a placement slot at one end of the work platform allows for a secure connection to the van, providing stable support during loading and unloading, preventing equipment swaying or displacement, ensuring the safety and accuracy of loading and unloading, and making the entire process more reliable.

[0015] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 The three-dimensional structure of the present invention Figure 1 ; Figure 2 The three-dimensional structure of the present invention Figure 2 ; Figure 3 This is an enlarged view of point A in the present invention; Figure 4 The three-dimensional structure of the present invention Figure 3 ; Figure 5 This is an enlarged view of section B of the present invention; Figure 6 This is a partial structural diagram of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the workbench of the present invention; Figure 8 This is a partial structural diagram of the present invention. Figure 2 ; Figure 9 This is an enlarged view of section B of the present invention.

[0018] The attached diagram lists the components represented by each number as follows: 1. Workbench; 2. Conveyor belt; 3. First connecting shaft; 4. Second connecting shaft; 5. Sliding block; 6. Telescopic rod; 7. Slide groove; 8. Return spring; 9. Rolling wheel; 10. Frame; 11. Drive cylinder; 12. Connecting plate; 13. First motor; 14. Groove; 15. Connecting rod; 16. Guide rod; 17. Torsion spring; 18. First transmission wheel; 19. Transmission belt; 20. Second transmission wheel; 21. Threaded cylinder; 22. Fixing plate; 23. First threaded rod; 24. Cleaning brush; 25. First rod; 26. Second rod; 27. Second threaded rod; 28. Worm gear; 29. ​​Worm; 30. Second motor; 31. Placement groove. Detailed Implementation

[0019] The technical solutions of the embodiments of the invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the invention.

[0020] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the invention.

[0021] Please see Figures 1-9 As shown, this invention is a loading and unloading device for a van, comprising two symmetrically arranged workbenches 1, with a retractable conveyor belt 2 positioned between the two workbenches 1. The conveyor belt 2 is rotatably connected via a first connecting shaft 3 and a second connecting shaft 4. Both ends of the first connecting shaft 3 are rotatably mounted on the two workbenches 1, and both ends of the second connecting shaft 4 are fixedly mounted with sliding blocks 5. Both sliding blocks 5 are slidably connected within a groove 7 formed on the workbenches 1. One end of a telescopic rod 6 is fixedly connected to each of the two sliding blocks 5, and the other end of the telescopic rod 6 is fixedly mounted on the inner wall of the groove 7. A return spring 8 is fitted onto the telescopic rod 6 to achieve the retraction and return of the conveyor belt 2. The lower part of the conveyor belt 2 abuts against a rolling wheel 9, which is rotatably mounted on a frame 10. The frame 10 is fixedly connected to the output end of a drive cylinder 11, which is fixedly mounted on a connecting plate 12. The connecting plate 12 is fixedly mounted between the two workbenches 1. Specifically, the conveyor belt can be extended or shortened by the drive cylinder, its main purpose being to extend into the interior of the van compartment for convenient transportation.

[0022] The working principle of the box truck loading and unloading equipment proposed in this invention is as follows: When the box truck loading and unloading equipment is working, the drive cylinder 11 is first activated, and the output end of the drive cylinder 11 extends outward, driving the frame 10 fixedly connected to it to move. Since the frame 10 is rotatably mounted with rollers 9, and the rollers 9 are in contact with the bottom of the conveyor belt 2, the movement of the frame 10 will push the conveyor belt 2.

[0023] At this time, one end of the conveyor belt 2 is rotatably mounted on the two worktables 1 through the first connecting shaft 3 to maintain a relatively fixed position, and the sliding blocks 5 fixedly installed at both ends of the other end of the connecting shaft 4 are slidably connected in the groove 7 opened on the worktable 1. Therefore, under the push of the rolling wheel 9, the sliding block 5 slides in the groove 7.

[0024] During the sliding process of the sliding block 5, it will stretch or compress the telescopic rod 6 fixedly connected to it. At the same time, the return spring 8 sleeved on the telescopic rod 6 will be stretched or compressed to generate elastic force. As the output end of the drive cylinder 11 continues to extend, the conveyor belt 2 will continue to extend until it extends into the interior of the freight car, facilitating the loading, unloading and transportation of goods.

[0025] After the loading and unloading of goods is completed, the output end of the drive cylinder 11 retracts. Under the action of the return spring 8, the telescopic rod 6 drives the sliding block 5 to slide in the reverse direction in the slide groove 7, thereby causing the second connecting shaft 4 to drive the conveyor belt 2 to shorten and return to the initial position.

[0026] In one embodiment, for the first connecting shaft 3, one end of the first connecting shaft 3 is fixedly mounted with the output end of the first motor 13, and the first motor 13 is fixedly mounted on one of the worktables 1 for driving the rotation of the conveyor belt 2.

[0027] The working principle of the van loading and unloading equipment proposed in this invention is as follows: When loading and unloading operations are required, the drive cylinder 11 is first activated, causing the conveyor belt 2 to extend into the van compartment. Then, the first motor 13 is activated. The first motor 13 is fixedly mounted on one of the worktables 1, and its output end is fixedly connected to one end of the first connecting shaft 3. When the first motor 13 operates, its output end drives the first connecting shaft 3 to rotate. Since the conveyor belt 2 is rotatably connected through the first connecting shaft 3 and the second connecting shaft 4, and both ends of the second connecting shaft 4 are connected to the worktable 1 through structures such as sliding blocks 5, telescopic rods 6, and return springs 8, when the first connecting shaft 3 rotates, it drives the conveyor belt 2 to rotate cyclically around the first connecting shaft 3 and the second connecting shaft 4. This transports goods placed at one end of the conveyor belt 2 into the van compartment, or transports goods from the van compartment out via the conveyor belt 2. After loading and unloading is completed, the drive cylinder 11 retracts, and the conveyor belt 2 shortens back to its initial position.

[0028] In one embodiment, for the workbench 1, a slot 14 is provided at one end of the two workbench 1s, a connecting rod 15 is rotatably installed inside the slot 14, and a guide rod 16 is fixedly installed on the connecting rod 15 to guide the goods into the conveyor belt 2.

[0029] In one embodiment, a torsion spring 17 is provided between the connecting rod 15 and the worktable 1 to reset the guide rod 16. A first transmission wheel 18 is fixedly installed at the end of the connecting rod 15 away from the guide rod 16. The first transmission wheel 18 is connected to a second transmission wheel 20 via a transmission belt 19 to transmit power.

[0030] In one embodiment, the second drive wheel 20 is fixedly mounted on the threaded cylinder 21, the threaded cylinder 21 is rotatably mounted on the fixed plate 22, and the fixed plate 22 is fixedly mounted on one of the worktables 1 to support the rotation of the threaded cylinder 21.

[0031] In one embodiment, the threaded cylinder 21 is threadedly connected to a first threaded rod 23. A cleaning brush 24 is rotatably mounted on the end of the first threaded rod 23 away from the threaded cylinder 21. The cleaning brush 24 is slidably connected between the two worktables 1 and is in contact with the surface of the conveyor belt 2 for cleaning debris on the conveyor belt 2.

[0032] The working principle of the box truck loading and unloading equipment proposed in this invention is as follows: During loading and unloading, the goods are placed near the slot 14 of the workbench 1. At this time, the goods will push the guide rod 16 on the connecting rod 15 rotatably installed in the slot 14. Since there is a torsion spring 17 between the connecting rod 15 and the workbench 1, when the guide rod 16 is rotated under force, it will drive the connecting rod 15 to rotate, causing the torsion spring 17 to deform. The guide rod 16 guides the goods to accurately enter the conveyor belt 2.

[0033] A first transmission wheel 18 is fixedly installed at the end of the connecting rod 15 away from the guide rod 16. During the rotation of the guide rod 16 and the connecting rod 15, the first transmission wheel 18 rotates accordingly. The first transmission wheel 18 drives the second transmission wheel 20, which is connected to it, to rotate through the transmission belt 19.

[0034] The second drive wheel 20 is fixedly mounted on the threaded cylinder 21, and the threaded cylinder 21 is rotatably mounted on the fixed plate 22. The fixed plate 22 is fixed on one of the worktables 1, so when the second drive wheel 20 rotates, it will drive the threaded cylinder 21 to rotate on the fixed plate 22.

[0035] The threaded cylinder 21 is threadedly connected to a first threaded rod 23. When the threaded cylinder 21 rotates, according to the principle of thread transmission, the first threaded rod 23 will move linearly along the axial direction of the threaded cylinder 21. A cleaning brush 24 is rotatably installed at the end of the first threaded rod 23 away from the threaded cylinder 21. The cleaning brush 24 is slidably connected between the two worktables 1 and in contact with the surface of the conveyor belt 2. The linear movement of the first threaded rod 23 drives the cleaning brush 24 to slide on the surface of the conveyor belt 2, thereby cleaning the debris on the conveyor belt 2.

[0036] When the loading and unloading of goods is completed, the guide rod 16 is no longer pushed by the goods. Under the elastic force of the torsion spring 17, the connecting rod 15 drives the guide rod 16 to reset. At the same time, the first transmission wheel 18, the second transmission wheel 20, the threaded cylinder 21, the first threaded rod 23 and the cleaning brush 24 also stop their corresponding actions, and the cleaning brush 24 returns to its initial position.

[0037] In one embodiment, for the workbench 1, a lifting mechanism is provided under both workbench 1. The lifting mechanism includes a first rod 25 fixedly installed on the workbench 1. The first rod 25 is slidably connected inside the second rod 26 to realize the height adjustment of the workbench 1.

[0038] In one embodiment, for the second rod 26, a second threaded rod 27 is rotatably mounted inside the second rod 26. The second threaded rod 27 is threadedly connected to the first rod 25. A worm gear 28 is fixedly mounted on the second threaded rod 27. The worm gear 28 meshes with a worm 29. The worm 29 is rotatably mounted on the second rod 26. The output end of a second motor 30 is fixedly mounted at one end of the worm 29. The second motor 30 is fixedly mounted on the second rod 26. The lifting and lowering of the worktable 1 is achieved by the rotation of the second motor 30.

[0039] In one embodiment, for the workbench 1, a placement slot 31 is provided at the end of the two workbench 1 away from the guide rod 16. The placement slot 31 is used to place the equipment on the van so that the equipment can be securely connected to the van.

[0040] The working principle of the van loading and unloading equipment proposed in this invention is as follows: when the height of the workbench 1 needs to be adjusted to accommodate vans of different heights, the second motor 30, which is fixedly installed on the second rod 26, is started. The output end of the second motor 30 drives the worm gear 29, which is fixedly connected to it, to rotate on the second rod 26. Since the worm gear 29 meshes with the worm wheel 28, the rotation of the worm gear 29 will drive the worm wheel 28 to rotate. And since the worm wheel 28 is fixedly installed on the second threaded rod 27, the rotation of the worm wheel 28 will drive the second threaded rod 27 to rotate inside the second rod 26.

[0041] The second threaded rod 27 is threadedly connected to the first rod 25, which is slidably connected inside the second rod 26. According to the principle of threaded transmission, the rotation of the second threaded rod 27 will cause the first rod 25 to move up and down linearly inside the second rod 26. Since the first rod 25 is fixedly installed on the worktable 1, the up and down movement of the first rod 25 will drive the worktable 1 to adjust its height.

[0042] Once the workbench 1 is adjusted to the appropriate height, move the entire equipment next to the van, aligning the placement slots 31 on the ends of the two workbench 1 furthest from the guide rod 16 and placing them on the van. The placement slots 31 and the van work together to securely connect the equipment to the van, facilitating subsequent loading and unloading operations. After loading and unloading are completed, the second motor 30 can be restarted and rotated in the opposite direction to lower the workbench 1 back to its initial position.

[0043] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] The preferred embodiments of the invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A loading and unloading device for a van, comprising a workbench (1), characterized in that: Two worktables (1) are provided, and a conveyor belt (2) is provided between the two worktables (1). The conveyor belt (2) is rotatably connected by a first connecting shaft (3) and a second connecting shaft (4). The two ends of the first connecting shaft (3) are rotatably mounted on the two worktables (1), and the two ends of the second connecting shaft (4) are fixedly mounted with sliding blocks (5). The two sliding blocks (5) are slidably connected to a slide groove (7). The slide groove (7) is opened on the worktable (1), and the two sliding blocks (5) are fixedly connected to the slide groove (7). One end of the telescopic rod (6) is installed, and the other end of the telescopic rod (6) is fixedly installed on the inner wall of the slide (7). The telescopic rod (6) is fitted with a return spring (8). The lower part of the conveyor belt (2) abuts against the rolling wheel (9). The rolling wheel (9) is rotatably installed on the frame (10). The frame (10) is fixedly connected to the output end of the drive cylinder (11). The drive cylinder (11) is fixedly installed on the connecting plate (12). The connecting plate (12) is fixedly installed between the two worktables (1).

2. The loading and unloading equipment for vans according to claim 1, characterized in that, One end of the first connecting shaft (3) is fixedly installed with the output end of the first motor (13), and the first motor (13) is fixedly installed on one of the worktables (1).

3. The loading and unloading equipment for a van according to claim 2, characterized in that, One end of each of the two workbenches (1) is provided with a slot (14), and a connecting rod (15) is rotatably installed inside the slot (14). A guide rod (16) is fixedly installed on the connecting rod (15).

4. The loading and unloading equipment for a van according to claim 3, characterized in that, A torsion spring (17) is provided between the connecting rod (15) and the worktable (1). A first transmission wheel (18) is fixedly installed at the end of the connecting rod (15) away from the guide rod (16). The first transmission wheel (18) is connected to a second transmission wheel (20) via a transmission belt (19).

5. The loading and unloading equipment for a van according to claim 4, characterized in that, The second transmission wheel (20) is fixedly mounted on the threaded cylinder (21), which is rotatably mounted on the fixed plate (22), which is fixedly mounted on one of the worktables (1).

6. The loading and unloading equipment for a van according to claim 5, characterized in that, The threaded cylinder (21) is threadedly connected to a first threaded rod (23). A cleaning brush (24) is rotatably installed at the end of the first threaded rod (23) away from the threaded cylinder (21). The cleaning brush (24) is slidably connected between two workbenches (1) and is in contact with the surface of the conveyor belt (2).

7. The loading and unloading equipment for a van according to claim 1, characterized in that, A lifting mechanism is provided below each of the two workbenches (1). The lifting mechanism includes a first rod (25) fixedly installed on the workbench (1) and the first rod (25) is slidably connected to the inside of a second rod (26).

8. The loading and unloading equipment for a van according to claim 7, characterized in that, The second rod (26) has a second threaded rod (27) rotatably mounted inside it. The second threaded rod (27) is threadedly connected to the first rod (25). The second threaded rod (27) has a worm gear (28) fixedly mounted on it. The worm gear (28) meshes with a worm (29). The worm (29) is rotatably mounted on the second rod (26). One end of the worm (29) is fixedly mounted with the output end of a second motor (30). The second motor (30) is fixedly mounted on the second rod (26).

9. A loading and unloading device for a van according to claim 3, characterized in that, The two workbenches (1) are provided with a placement slot (31) at one end away from the guide rod (16), the placement slot (31) being used for placement on a van.

10. The method of using a van loading and unloading equipment according to claim 1, characterized in that, Includes the following steps: Step 1: First, start the drive cylinder (11). The output end of the drive cylinder (11) extends outward, driving the frame (10) fixedly connected to it to move. Step 2: Since the frame (10) is rotatably mounted with rollers (9) and the rollers (9) are in contact with the bottom of the conveyor belt (2), the movement of the frame (10) will push the conveyor belt (2); Step 3: At this time, one end of the conveyor belt (2) is rotated and installed on the two worktables (1) through the first connecting shaft (3) to maintain a relatively fixed position, and the sliding blocks (5) fixedly installed at both ends of the connecting shaft (4) at the other end are slidably connected in the groove (7) opened on the worktable (1). Therefore, under the push of the rolling wheel (9), the sliding block (5) will slide in the groove (7). Step 4: During the sliding process of the sliding block (5), the telescopic rod (6) fixedly connected to it will be stretched or compressed. At the same time, the return spring (8) sleeved on the telescopic rod (6) will be stretched or compressed to generate elastic force. As the output end of the drive cylinder (11) continues to extend, the conveyor belt (2) will continue to extend until it extends into the interior of the freight car, which facilitates the loading, unloading and transportation of goods. Step 5: After the loading and unloading of goods is completed, the output end of the drive cylinder (11) retracts. Under the action of the spring force of the reset spring (8), the telescopic rod (6) drives the sliding block (5) to slide in the opposite direction in the slide groove (7), thereby causing the second connecting shaft (4) to drive the conveyor belt (2) to shorten and return to the initial position.

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