An online loading and unloading system for strip cargo

Abstract

This invention discloses an online loading and unloading system for strip-shaped goods, belonging to the field of cargo loading, unloading, and storage technology. It includes a horizontal conveyor, a gripping device, and a storage device. The storage device includes storage boxes and a hoist, an upper conveyor, and a lower conveyor for transporting the storage boxes. The hoist handles the transfer of storage boxes between the upper and lower conveyors. One of the upper and lower conveyors is used to hold an empty storage box. The horizontal conveyor is connected to the production line. A clamping mechanism is installed at the front end of the horizontal conveyor. When downstream equipment needs to suspend supply, the clamping mechanism holds the goods on the horizontal conveyor. The gripping device grabs the goods on the horizontal conveyor and loads them into the storage box located on the hoist. Once the storage box is full, it is stored on the upper or lower conveyor. After the downstream equipment resumes operation, the gripping device grabs the goods from the storage box located on the hoist and places them on the horizontal conveyor, thus solving the problem of production line shutdowns caused by downstream equipment failures.

Description

Technical Field

[0001] This invention belongs to the field of cargo loading, unloading and storage technology, and specifically relates to an online loading and unloading system for strip cargo. Background Technology

[0002] If downstream equipment malfunctions or has insufficient processing capacity during the transport of goods on the production line, goods will accumulate on the production line, causing the entire production line to stop operating. This not only affects production efficiency but also may scrap some semi-finished products, resulting in significant waste. To solve this problem, the existing method is to add bypass conveyor equipment to the production line. When downstream equipment malfunctions or has insufficient processing capacity, the bypass conveyor is activated to transport goods to the bypass conveyor. After the equipment is restored, the goods on the bypass conveyor are transported back to the production line. However, this method has limited storage capacity, requires a long bypass conveyor, occupies a lot of factory space, and makes equipment layout difficult. Summary of the Invention

[0003] The purpose of this invention is to provide an online loading and unloading system for strip and block goods, which is used to buffer strip and block goods on the production line, solve the problem of backlog caused by downstream equipment failure, avoid the downtime of the entire production line, and improve storage efficiency and storage space utilization.

[0004] This invention discloses an online loading and unloading system for strip-shaped goods, comprising a horizontal conveyor, a gripping device, a storage device, and a frame.

[0005] The horizontal conveyor is connected to the production line as a conveying device. Strips and blocks of goods are transported on the horizontal conveyor. A clamping mechanism is installed at the front end of the horizontal conveyor. When downstream equipment needs to pause supply, the clamping mechanism clamps the transported goods, blocking them from moving on the horizontal conveyor. The storage device includes a storage box and a hoist for transporting the storage box, an upper conveyor, a lower conveyor, an upper handling mechanism, and a lower handling mechanism. The storage box is used to store strips and blocks of goods. The upper and lower conveyors are arranged in parallel on the horizontal conveyor. On one side of the elevator, the elevator and the upper conveyor are connected via an upper transport mechanism to transfer the storage box, and the elevator and the lower conveyor are connected via a lower transport mechanism to transfer the storage box. The storage box is loaded and unloaded on the elevator. When loading, the gripping device grabs the goods blocked on the horizontal conveyor and puts them into the storage box located on the elevator. When unloading, it grabs the goods in the storage box located on the elevator and places them on the horizontal conveyor. The horizontal conveyor, gripping device, and storage equipment are installed on the frame, and the gripping mechanism is installed at a position higher than the horizontal conveyor.

[0006] Furthermore, the gripping mechanism includes a horizontal slide, a vertical slide, and a suction cup. The horizontal slide moves perpendicular to the conveying direction of the horizontal conveyor. The vertical slide is installed below the sliding seat of the horizontal slide. The suction cup is a long, narrow suction cup, the length of which is preferably equal to the loading width of the storage box. The suction cup is installed on the sliding seat of the vertical slide. When the gripping mechanism loads goods, the horizontal slide moves above the horizontal conveyor, the vertical slide moves downward, and the suction cup grips the strip of goods on the horizontal conveyor. Then, the vertical slide moves upward, and after the horizontal slide moves towards the elevator and above the storage box, the vertical slide moves downward again, and the suction cup places the goods into the storage box, completing the loading. When the gripping mechanism unloads goods, the horizontal slide moves towards the elevator and above the storage box, the vertical slide moves downward again, and the suction cup grips the goods in the storage box. Then, the vertical slide moves upward, and after the horizontal slide moves above the horizontal conveyor, the vertical slide moves downward again, and the suction cup places the goods back onto the horizontal conveyor. Furthermore, a rotating frame is installed on the sliding seat of the vertical slide, and the suction cup is installed on the rotating frame. After the suction cup grabs the goods on the horizontal conveyor, it rotates 90° and puts them into the storage box, or after grabbing the goods in the storage box, it rotates 90° and places them on the horizontal conveyor. This setting allows for loading and unloading from the side of the storage box, reduces the lifting height of the vertical slide, and allows the storage box to be deeper, storing more layers of goods.

[0007] Furthermore, the storage box has openings on the top and one side, allowing strips of goods to enter and exit the storage box from one side of the opening, thus improving the storage and retrieval speed; even further, the storage box can store multiple layers of goods.

[0008] Furthermore, the horizontal conveyor is also equipped with a blocking mechanism at its rear end. When the number of goods blocked by the clamping mechanism reaches a set number, the blocking mechanism will block subsequent goods, so that the number of goods blocked by the clamping mechanism is constant. Furthermore, the number of goods blocked by the clamping mechanism is exactly the number of goods in one layer of the storage box, which can be picked up by the suction cup at one time to fill one layer of the storage box. Furthermore, the blocking mechanism includes a cylinder and a baffle installed on the head of the cylinder.

[0009] Furthermore, the hoist includes a portal frame, two guide rails vertically mounted on the left and right sides of the portal frame, and a bracket that slides up and down along each guide rail. The two brackets are synchronously lifted by a chain lifting mechanism, and the two brackets are used to support the storage box. Even further, the chain lifting mechanism includes two lifting chains, a left lifting chain vertically wound around a left driving sprocket and a left driven sprocket, and a right lifting chain vertically wound around a right driving sprocket and a right driven sprocket. The left and right driving sprockets are driven by the same shaft. The lifting mechanism is driven by a reducer. The left lifting chain is connected to a bracket mounted on the left guide rail and pulls the bracket up and down. The right lifting chain is connected to a bracket mounted on the right guide rail and pulls the bracket up and down. Furthermore, the bracket is equipped with a pneumatic push plate. The pneumatic push plates on the two brackets move in opposite directions to clamp the storage boxes on the two brackets, ensuring safety during the lifting and conveying process. Furthermore, the pneumatic push plate is L-shaped, and a stop bar is provided at the front end of the lifting machine to prevent the storage boxes on the lifting machine from tipping over.

[0010] Furthermore, both sides of the upper and lower conveyors are equipped with wheel chocks to ensure smooth transport of the storage boxes.

[0011] Furthermore, both the upper and lower conveyors are two parallel conveyor belts; even further, both the upper and lower transport mechanisms include a horizontal moving frame and a lifting platform mounted on the horizontal moving frame. The upper transport mechanism is located between the two parallel conveyor belts of the upper conveyor, and the lower transport mechanism is located between the two parallel conveyor belts of the lower conveyor. The storage box handover method is as follows: after the lifting platform of the upper transport mechanism lifts the storage box on the upper conveyor, the horizontal moving frame moves to the elevator position, and the lifting platform descends to place the storage box on the elevator; or after the lifting platform lifts the storage box on the elevator, the horizontal moving frame moves above the upper conveyor, and the lifting platform descends to place the storage box on the upper conveyor. Similarly, after the lifting platform of the lower transport mechanism lifts the storage box on the lower conveyor, the horizontal moving frame moves to the elevator position, and the lifting platform descends to place the storage box on the elevator; or after the lifting platform lifts the storage box on the elevator, the horizontal moving frame moves above the lower conveyor, and the lifting platform descends to place the storage box on the lower conveyor.

[0012] The invention works as follows: Multiple empty storage boxes are arranged on a lower conveyor. The lower transport mechanism transfers the storage boxes to an elevator, which then raises them to the loading position. When downstream equipment malfunctions or has insufficient capacity, a clamping mechanism activates to hold the goods on the horizontal conveyor, preventing them from being loaded. Once a certain number of goods are blocked, a gripping device picks them up and loads them into the storage boxes. After one layer is loaded, the elevator descends one layer, and so on, loading boxes layer by layer. When the storage boxes are full, the elevator raises them to the upper transport mechanism, which then transports them to the upper conveyor. This process continues, loading and storing boxes one by one on the upper conveyor. When downstream equipment is operating normally and upstream equipment stops supplying goods, the stored goods are returned to the horizontal conveyor. If a storage box on the elevator is not yet full, the gripping device removes the goods from that storage box and places it on the horizontal conveyor. The elevator transports empty storage boxes to the lower handling mechanism, which then moves them to the lower conveyor. The upper handling mechanism then moves full storage boxes from the upper conveyor back to the elevator. The elevator then transports the full storage boxes to the unloading position. A gripping device removes the goods from the storage boxes and places them on a horizontal conveyor for further processing. After the gripping device removes one layer of goods, the elevator rises one layer, removing goods from the storage boxes layer by layer. After emptying a storage box, it is lowered to the lower handling mechanism, which moves it to the lower conveyor. This process continues, unloading boxes one by one and storing empty boxes on the lower conveyor. This buffering mechanism helps prevent backlogs caused by downstream equipment failures and avoids production line shutdowns. When downstream equipment is operating normally but upstream equipment is temporarily slowing down, the stored goods return to the production line, improving production efficiency. In this invention, empty storage boxes are also arranged on the upper conveyor, and after being loaded, they are stored on the lower conveyor.

[0013] This invention discloses an online loading and unloading system for strip-shaped goods, comprising a horizontal conveyor, a gripping device, and a storage device. The storage device includes storage boxes and a hoist, an upper conveyor, and a lower conveyor for transporting the storage boxes. The hoist handles the transfer of storage boxes between the upper and lower conveyors. One of the upper and lower conveyors is used to hold an empty storage box. The horizontal conveyor is connected to the production line, and a clamping mechanism is installed at its front end. When downstream equipment needs to suspend supply, the clamping mechanism blocks the transported goods on the horizontal conveyor. The gripping device grabs the goods on the horizontal conveyor and loads them into the storage box located on the hoist. Once the storage box is full, it is stored on the upper or lower conveyor. When the downstream equipment resumes normal operation, the gripping device grabs the goods from the storage box located on the hoist and places them on the horizontal conveyor. This effectively solves the problem of backlog caused by downstream equipment failure on the production line and avoids the shutdown of the entire production line. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. The following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the invention.

[0015] Figure 1 This is a structural diagram of an embodiment of an online loading and unloading system for strip cargo according to the present invention.

[0016] Figure 2 yes Figure 1 The rotated view.

[0017] Figure 3 for Figure 1 Structural diagram of a medium-level conveyor.

[0018] Figure 4 yes Figure 1 Structural diagram of the gripping device.

[0019] Figure 5 yes Figure 4 The rotated view.

[0020] Figure 6 yes Figure 1 Structural diagram of the hoist.

[0021] Figure 7 yes Figure 6 The rotated view.

[0022] Figure 8 yes Figure 1 View after the horizontal conveyor, gripping device, and elevator have been removed.

[0023] Figure 9 yes Figure 1 Structural diagram of the middle and lower level conveyor.

[0024] Figure 10 yes Figure 1 Structural diagram of the middle and lower layer handling mechanism.

[0025] Figure 11 yes Figure 1 Structural diagram of the middle frame.

[0026] Figure 12 yes Figure 2 A structural diagram of the storage box.

[0027] Reference numerals: 1. Hoist; 2. Horizontal conveyor; 3. Gripping device; 4. Upper transport mechanism; 5. Upper conveyor; 6. Frame; 7. Lower conveyor; 8. Lower transport mechanism; 9. Storage box; 11. Reducer; 12. Rotating shaft; 13. Portal frame; 14. Left guide rail; 14b. Right guide rail; 15. Left lifting chain; 15b. Right lifting chain; 16. Stop bar; 17. Pneumatic pusher A; 18. Bracket A; 19. Pneumatic pusher B; 20. Bracket B; 21. Conveyor belt A; 22. Conveyor belt B; 23. Drive shaft; 24. Stop bar 25. Wheel frame A; 26. Wheel retainer frame B; 37. Photoelectric sensor; 38. Mounting support plate; 39. Guide rail A; 30. Cylinder A; 31. Cylinder B; 32. Support plate; 33. Horizontal moving frame; 54. Baffle plate; 55. Cylinder C; 66. Bidirectional telescopic cylinder; 67. Clamping plate A; 68. Clamping plate B; 69. Fixed seat; 70. Guide rail D; 61. Cylinder D; 62. Sliding seat A; 63. Guide rail E; 64. Motor; 65. Rotating frame; 66. Sliding seat B; 77. Suction cup; 78. Vertical seat; 79. Cylinder E. Implementation

[0028] Figure 1 and Figure 12 An embodiment of an online loading and unloading system for strip cargo according to the present invention is shown, including a horizontal conveyor 2, a gripping device 3, a storage device, and a frame 6.

[0029] The horizontal conveyor 2 is connected to the production line as a conveying device. Strips and blocks of goods are transported on the horizontal conveyor. (See attached image) Figure 3 A clamping mechanism is provided at the front end of the horizontal conveyor 2. This clamping mechanism includes a bidirectional telescopic cylinder 54 and clamping plates A55 and B56. The bidirectional telescopic cylinder 54 pushes clamping plates A55 and B56 to clamp and open. When the downstream equipment needs to suspend supply, the clamping mechanism clamps the goods being transported, thus blocking the goods being transported on the horizontal conveyor 2. A blocking mechanism is also provided at the rear end of the horizontal conveyor 2. When the goods blocked by the clamping mechanism reach a set number, the blocking mechanism blocks the subsequent goods, so that the number of goods blocked by the clamping mechanism is constant. The number of goods blocked by the clamping mechanism is exactly the number of goods in one layer of the storage box. The blocking mechanism includes a cylinder C53 and a baffle 52 installed at the head of the cylinder C53.

[0030] The storage device includes a storage box 9 and a hoist 1, an upper conveyor 5, a lower conveyor 7, an upper handling mechanism 4, and a lower handling mechanism 8 for transporting the storage box. The storage box 9 is used to store strips of goods. The upper conveyor 5 and the lower conveyor 7 are arranged in parallel on one side of the hoist 1. The hoist 1 and the upper conveyor 5 are connected by the upper handling mechanism 4, and the hoist 1 and the lower conveyor 7 are connected by the lower handling mechanism 8. The storage box 9 is loaded and unloaded on the hoist. When loading, the gripping device 3 grips the goods blocked on the horizontal conveyor 2 and loads them into the storage box 9 located on the hoist 1. When unloading, it grips the goods in the storage box 9 located on the hoist 1 and places them on the horizontal conveyor 2. The horizontal conveyor 2, the gripping device 3, and the storage device are installed on a frame 6. The gripping mechanism 3 is installed higher than the horizontal conveyor 2.

[0031] See Figure 4 and Figure 5 The gripping mechanism 3 includes a horizontal slide, a vertical slide, and a suction cup 67. The horizontal slide includes a fixed base 61, a guide rail D62 mounted on the fixed base 61, a sliding seat A64 sliding along the guide rail D62, and a cylinder D63 that pushes the sliding seat A64 to move. The fixed base 61 of the gripping mechanism 3 is mounted on the frame 6. The direction of movement of the sliding seat A64 is perpendicular to the conveying direction of the horizontal conveyor 2. The vertical slide includes a vertical base 70, a guide rail E65 mounted on the vertical base 70, a sliding seat B68 sliding along the guide rail E65, and a cylinder E71 that pushes the sliding seat B68 to move. A rotating frame 67 is rotatably mounted on the sliding seat B68. A motor 66 drives the rotating frame 67 to rotate. The suction cup 69 is mounted on the rotating frame 67. The suction cup is a long strip-shaped suction cup, the length of which is preferably equal to the loading width of the storage box 9. The suction cup is mounted on the sliding seat of the vertical slide.

[0032] See Figure 12 The storage box 9 has an opening on the top and one side, allowing strips of goods to be loaded into or removed from the opening side, thus improving storage and retrieval speed; furthermore, the storage box can store multiple layers of goods.

[0033] See Figure 6 and Figure 7The hoist 1 includes a portal frame 13, a left guide rail 14 vertically mounted on the left side of the portal frame 13, and a right guide rail 14b vertically mounted on the right side. A bracket A18 is mounted on the left guide rail 14 and slides up and down along it. A bracket B20 is mounted on the right guide rail 14b and slides up and down along it. Brackets A18 and B20 are synchronously lifted by a chain lifting mechanism. Brackets A18 and B20 are used to support the storage box 9. The chain lifting mechanism includes a left lifting chain 15 and a right lifting chain 15b. The left lifting chain 15 is vertically wound around the left driving sprocket and the left driven sprocket, and the right lifting chain 15b is vertically wound around the right driving sprocket and the right driven sprocket. The left and right driving sprockets are connected by the same... The rotating shaft 12 is driven by the reducer 11. The left lifting chain 15 is connected to the bracket A18 installed on the left guide rail 14 and pulls the bracket A18 up and down. The right lifting chain is connected to the bracket B20 installed on the right guide rail 14B and pulls the bracket B20 up and down. The bracket A18 is equipped with a pneumatic push plate 17 driven by a cylinder, and the bracket B20 is equipped with a pneumatic push plate 19 driven by a cylinder. The pneumatic push plates on the two brackets move in opposite directions to clamp the storage boxes on the two brackets, ensuring the safety of the storage boxes 9 during the lifting and conveying process. The pneumatic push plates 17 and 19 are both L-shaped. The front end of the elevator 1 is equipped with two stop bars 16 to prevent the storage boxes 9 on the elevator 1 from tilting back and forth.

[0034] In this embodiment, the upper conveyor 5 and the lower conveyor 7 have the same structure. The structure of the lower conveyor 7 is described in [reference needed]. Figure 9 The lower conveyor 7 includes two parallel conveyor belts A21 and B22. A wheel chute A24 is installed on the right side of the lower conveyor 7 and a wheel chute B25 is installed on the left side to achieve smooth transport of the storage box 9. Both conveyor belts A21 and B22 are driven by drive shaft 23. Multiple photoelectric sensors 26 are installed on wheel chute A24 and wheel chute B25 to detect the position of the storage box on the lower conveyor 7.

[0035] The upper transport mechanism 4 and the lower transport mechanism 8 have the same structure in this embodiment. The structure of the lower transport mechanism 8 is described in detail below. Figure 10 The system includes a horizontal moving frame 37 and a lifting platform mounted on the horizontal moving frame 37. A cylinder A33 pushes the horizontal moving frame 37 to move on a guide rail A32. The lifting platform includes a cylinder B35 vertically mounted on the horizontal moving frame 37 and a support plate 36 pushed by the cylinder B35. The lower transport mechanism 8 is located between two parallel conveyor belts of the lower conveyor 7. The guide rail A32 of the lower transport mechanism 8 is fixed on a mounting support plate 31. The mounting support plate 31 is mounted on the side of the lower conveyor 7 and on the frame 6. The upper transport mechanism 4 is located between two parallel conveyor belts of the upper conveyor 5. The mounting support plate 31 of the upper transport mechanism 4 is mounted on the side of the upper conveyor 5 and on the frame 6.

Claims

1. An online loading and unloading system for strip-shaped goods, characterized in that: The system includes a horizontal conveyor, a gripping device, a storage device, and a frame. The horizontal conveyor is integrated into the production line as a conveying device, transporting strip-shaped goods. A clamping mechanism is installed at the front end of the horizontal conveyor. The storage device includes a storage box, an elevator for transporting the storage box, an upper conveyor, a lower conveyor, an upper handling mechanism, and a lower handling mechanism. The storage box is used to store strip-shaped goods. The upper and lower conveyors are arranged parallel to one side of the elevator, and the elevator and the upper conveyor are connected by the upper... The transport mechanism facilitates the transfer of storage boxes. The elevator and the lower conveyor are connected via the lower transport mechanism, allowing for the transfer of storage boxes. The storage boxes are loaded and unloaded on the elevator. During loading, the gripping device grabs goods obstructing the horizontal conveyor and loads them into the storage boxes located on the elevator. During unloading, it grabs goods from the storage boxes on the elevator and places them onto the horizontal conveyor. The horizontal conveyor, gripping device, and storage equipment are mounted on the frame. The gripping mechanism is installed higher than the horizontal conveyor, and a blocking mechanism is provided at the rear end of the horizontal conveyor. When downstream equipment malfunctions or has insufficient processing capacity, requiring a supply suspension, the clamping mechanism clamps the goods being conveyed, blocking them on the horizontal conveyor. When the number of goods blocked by the clamping mechanism is exactly one layer of the storage box, the blocking mechanism blocks subsequent goods, allowing the blocked goods to be picked up by the gripping device at once and fill one layer of the storage box. The gripping device picks up the blocked goods and loads them into the storage box. After one layer is filled, the elevator descends one layer's height, and the process continues layer by layer until the storage box is full. The elevator is raised to the position of the upper transport mechanism, which then moves the storage box onto the upper conveyor. When the downstream equipment of the production line resumes normal operation, the upstream equipment suspends supply. The elevator transports the storage box containing the goods to the unloading position height. The gripping device grabs the goods out of the storage box and places them on the horizontal conveyor. After the gripping device removes one layer of goods, the elevator rises one layer higher, removing the goods from the storage box layer by layer. After emptying one storage box, the elevator lowers the empty storage box to the position of the lower transport mechanism, which then moves the empty storage box onto the lower conveyor.

2. The online loading and unloading system for strip cargo according to claim 1, characterized in that: The gripping mechanism includes a horizontal slide, a vertical slide, and a suction cup. The horizontal slide moves perpendicular to the conveying direction of the horizontal conveyor. The vertical slide is installed below the sliding seat of the horizontal slide. The suction cup is a long, narrow suction cup, the length of which is preferably equal to the loading width of the storage box. The suction cup is installed on the sliding seat of the vertical slide. When loading, the horizontal slide moves above the horizontal conveyor, the vertical slide moves downward, and the suction cup grips the strip of goods on the horizontal conveyor. Then, the vertical slide moves upward, and the horizontal slide moves towards the elevator to above the storage box. After that, the vertical slide moves downward again, and the suction cup places the goods into the storage box, completing the loading. When unloading, the horizontal slide moves towards the elevator to above the storage box, the vertical slide moves downward again, and the suction cup grips the goods in the storage box. Then, the vertical slide moves upward, and the horizontal slide moves above the horizontal conveyor. After that, the vertical slide moves downward again, and the suction cup places the goods back onto the horizontal conveyor.

3. The online loading and unloading system for strip cargo according to claim 2, characterized in that: A rotating frame is installed on the sliding seat of the vertical slide table. The suction cup is installed on the rotating frame. After the suction cup grabs the goods on the horizontal conveyor, it rotates 90° and puts them into the storage box, or after grabbing the goods in the storage box, it rotates 90° and places them on the horizontal conveyor.

4. The online loading and unloading system for strip cargo according to any one of claims 1, 2, or 3, characterized in that: The storage box has an opening on the top and one side, and strips of goods enter and exit the storage box from the opening on one side. The storage box can store multiple layers of goods.

5. The online loading and unloading system for strip cargo according to claim 4, characterized in that: The lifting machine includes a portal frame and two guide rails vertically installed on the left and right sides of the portal frame. Each guide rail has a bracket that slides up and down along the guide rail. The two brackets are lifted synchronously by a chain lifting mechanism. The two brackets are used to support the storage box.

6. The online loading and unloading system for strip cargo according to claim 5, characterized in that: The chain lifting mechanism includes two lifting chains, left and right. The left lifting chain is vertically wound around the left driving sprocket and the left driven sprocket, and the right lifting chain is vertically wound around the right driving sprocket and the right driven sprocket. The left and right driving sprockets are driven by the same shaft, which is driven by a reducer. The left lifting chain is connected to a bracket installed on the left guide rail and pulls the bracket up and down. The right lifting chain is connected to a bracket installed on the right guide rail and pulls the bracket up and down.

7. The online loading and unloading system for strip cargo according to claim 6, characterized in that: The bracket is equipped with an L-shaped pneumatic push plate. The pneumatic push plates on the two brackets move in opposite directions to clamp the storage boxes on the two brackets, ensuring safety during the lifting and conveying process. The front end of the elevator is equipped with a stop bar to prevent the storage boxes on the elevator from tipping over.

8. The online loading and unloading system for strip cargo according to claim 7, characterized in that: Both the upper and lower conveyors are two parallel conveyor belts; both the upper and lower transport mechanisms include a horizontal moving frame and a lifting platform installed on the horizontal moving frame. The upper transport mechanism is located between the two parallel conveyor belts of the upper conveyor, and the lower transport mechanism is located between the two parallel conveyor belts of the lower conveyor.

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