Goods transfer device for warehouse logistics

Abstract

The invention discloses a cargo transfer device for warehouse logistics, and relates to the technical field of cargo transfer, the device comprises a transfer frame, a plurality of rotating rollers are rotatably mounted in the transfer frame, the outer walls of the plurality of rotating rollers are in transmission connection with a plurality of conveying belts, and two adjusting boxes are symmetrically arranged at the bottom ends of the two sides in the transfer frame; a conveying structure for driving the conveying belt to operate is arranged at the upper end of the adjusting box, and an adjusting structure is arranged in the adjusting box; according to the conveying device, the adjusting structures are matched with the seam clamping preventing structures, the adjusting structures can adjust the distance between the two adjacent conveying structures and the distance between the conveying belts, and therefore the overall width is adjusted to adapt to goods of different sizes; the arc surface of the J-shaped guide plate guides edges and corners of goods to move out, the situation that small goods are clamped is avoided, the friction force between the goods and the guide plate is reduced through the rotating wheels, the situation that the goods are too heavy and cannot move is avoided, the first spring is matched with the extension plate, gaps of the conveying belts are filled, and the goods are prevented from falling off.

Description

Technical Field

[0001] The invention relates to the technical field of cargo transfer, in particular to a cargo transfer device used for warehousing logistics. Background Art

[0002] In the warehousing and logistics industry, the transfer of goods is a vital link. Traditional transmission equipment, such as conveyor belts, usually have fixed widths and spacing, which limits their adaptability to goods of different sizes. When handling smaller goods, these goods are prone to get stuck between the conveyor belts, resulting in low transmission efficiency and even possible damage to the goods. In addition, for heavier goods, due to the large friction between the conveyor belt and the goods, the goods may not move smoothly, further affecting the transmission efficiency.

[0003] In order to solve these problems, some adjustable width transmission equipment has appeared on the market. However, these devices can usually only simply adjust the width of the conveyor belt, but cannot effectively solve the problems of goods getting stuck and excessive friction.

[0004] Based on this, a cargo transfer device for warehousing logistics is now provided, which can eliminate the disadvantages of existing devices. Summary of the invention

[0005] The object of the present invention is to provide a cargo transfer device for warehousing logistics to solve the problems of cargo jamming and excessive friction in the background technology.

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

[0007] A cargo transfer device for warehousing logistics, comprising a transfer frame, a plurality of rollers are rotatably installed inside the transfer frame, a plurality of conveyor belts are connected to the outer walls of the plurality of rollers through transmission, two adjustment boxes are symmetrically arranged at the bottom ends of both sides inside the transfer frame, a transmission structure for driving the conveyor belts is arranged at the upper end of the adjustment box, and an adjustment structure is arranged inside the adjustment box;

[0008] The adjusting structure includes a number of first adjusting rods, second adjusting rods arranged inside the adjusting box, and an adjusting motor installed on the outer wall of the adjusting box. The output end of the adjusting motor extends into the corresponding adjusting box and is fixedly connected to a bidirectional screw rod. The other end of the bidirectional screw rod is fixed to the bidirectional screw rod inside another adjusting box through a long rod. Both ends of the bidirectional screw rod are threadedly connected to first adjusting blocks. The inner wall of the adjusting box is symmetrically provided with movable grooves, and movable rods are slidably arranged therein. Second adjusting blocks corresponding to the first adjusting blocks are slidably arranged on the movable rods. A first adjusting rod is rotatably installed at the upper ends of one first adjusting block and one second adjusting block, and a second adjusting rod is rotatably installed at the upper ends of the other first adjusting block and the other second adjusting block. The other end of the first adjusting rod is rotatably connected to the second adjusting rod through a shaft block. The middle of each first adjusting rod and second adjusting rod is connected to a transmission structure.

[0009] Preferably, the transmission structure includes a number of U-shaped frames. Upper movable openings matching the U-shaped frames are formed at the upper ends of the adjusting boxes. The outer walls of the U-shaped frames are slidably connected to the inner walls of the upper movable openings. A fixed round block is fixed in the middle of the bottom end of the U-shaped frame, and the fixed round block is rotatably connected to the first adjusting rod and the second adjusting rod. A contact roller is rotatably installed inside the U-shaped frame, and the outer wall of the contact roller is in transmission connection with a transmission belt. Auxiliary rollers are rotatably installed on both sides of the U-shaped frame, and the contact roller is fixed to the two auxiliary rollers. A rectangular opening is formed through the middle of the contact roller and the two auxiliary rollers. A rectangular rod matching the rectangular opening is rotatably installed inside the transfer frame, and one end of the rectangular rod is fixedly connected to the output end of a transport motor installed on the outer wall of the transfer frame.

[0010] Preferably, a sliding block is fixed to the lower end of the shaft block. A connecting plate is arranged below the shaft block. Side movable openings matching the connecting plate are formed at the opposite ends of the two adjusting boxes. A sliding groove is formed at the upper end of the connecting plate, and the outer wall of the sliding block is slidably connected to the inner wall of the sliding groove. The connecting plate is connected to an anti-jamming seam structure, and the anti-jamming seam structure is arranged between two adjacent transmission belts. The anti-jamming seam structure includes a number of J-shaped guide plates and a number of elastic telescopic rods. The number of elastic telescopic rods is fixed to the upper end of the connecting plate. Two of the number of elastic telescopic rods are in a group, and the top of the telescopic end of each group of elastic telescopic rods is fixed with a J-shaped guide plate. A number of rotating wheels are rotatably installed at the upper ends of the J-shaped guide plates.

[0011] Preferably, spring grooves are symmetrically formed on both sides of the J-shaped guide plate, and a first spring is fixed inside the spring grooves. One end of the first spring away from the spring groove is fixedly connected to an extension plate, and two adjacent extension plates are in contact with each other.

[0012] Preferably, the middle part of the lower end of the J-shaped guide plate is fixedly connected to a fixing ring through a fixing rod. The fixing ring is connected to a tensioning structure. The tensioning structure includes a tensioning roller rotatably installed inside the fixing ring. The bottom of the side wall of the tensioning roller is in contact with the conveyor belt. The tensioning roller is rotatably installed between two movable blocks. An active telescopic rod and a second spring are fixed to the upper end of the movable block. The active telescopic rod is arranged inside the second spring. The upper ends of the active telescopic rod and the second spring are fixedly connected to a fixing block. The fixing block is fixed to the outer wall of the transfer rack. A tensioning opening matching the tensioning roller is formed on the transfer rack.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. Through the cooperation of the adjustment structure and the anti-jamming structure, the adjustment structure can adjust the distance between two adjacent transmission structures and the conveyor belt, so as to adjust the overall width to adapt to goods of different sizes. Moreover, the sliding block cooperates with the chute to adjust the connecting plate, so that the anti-jamming structure is located between the two conveyor belts. The arc surface of the J-shaped guide plate guides the edges and corners of the goods out to avoid small goods from getting stuck. The rotating wheel reduces the friction between the goods and the guide plate to prevent the goods from being too heavy to move. The first spring cooperates with the extension plate to fill the gap of the conveyor belt to prevent the goods from falling.

[0015] 2. Through the cooperation of the tensioning structure and the conveyor belt, when the goods move onto the J-shaped guide plate, their gravity will compress the elastic telescopic rod, and then drive the fixing ring and the tensioning roller to move downward. The downward movement of the tensioning roller increases the tension of the conveyor belt, improves the friction between the conveyor belt and the contact roller, and thus enhances the transmission efficiency. When the goods leave the position of the J-shaped guide plate, the elastic telescopic rod and the second spring rebound to reset the tensioning roller and the J-shaped guide plate. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the present invention.

[0017] Figure 2 It is a schematic structural diagram of the upper end position of the present invention.

[0018] Figure 3 It is a schematic structural diagram of the transmission structure of the present invention.

[0019] Figure 4 It is a schematic structural diagram of the adjustment structure of the present invention.

[0020] Figure 5 For the present invention Figure 4 It is a schematic structural diagram of the position A in

[0021] Figure 6 It is a structural sectional view of the adjustment box of the present invention.

[0022] Figure 7This is a schematic structural diagram of the anti-jamming seam structure of the present invention.

[0023] Figure 8 This is a structural sectional view of the J-shaped guide plate of the present invention.

[0024] Figure 9 This is a schematic structural diagram of the tensioning structure of the present invention.

[0025] Annotation of reference numerals in the drawings: 1, transfer rack; 11, tensioning opening; 2, rotating roller; 3, conveyor belt; 4, transmission structure; 401, U-shaped frame; 4011, fixed round block; 402, contact roller; 403, auxiliary roller; 404, rectangular opening; 405, rectangular rod; 406, transport motor; 5, adjustment box; 51, upper movable opening; 52, side movable opening; 53, adjustment structure; 531, adjustment motor; 532, bidirectional screw; 533, long rod; 534, first adjustment block; 535, first adjustment rod; 536, second adjustment rod; 537, shaft block; 538, sliding block; 539, connecting plate; 5391, chute; 540, second adjustment block; 541, movable rod; 542, movable groove; 6, anti-jamming seam structure; 601, J-shaped guide plate; 602, runner; 603, extension plate; 604, elastic telescopic rod; 605, fixed rod; 606, fixed ring; 611, spring groove; 631, first spring; 7, tensioning structure; 701, fixed block; 702, movable telescopic rod; 703, second spring; 704, movable block; 705, tensioning roller. Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] In one embodiment, as Figures 1-9 shown, a goods transfer device for warehousing and logistics includes a transfer rack 1. A plurality of rotating rollers 2 are rotatably installed inside the transfer rack 1. A plurality of conveyor belts 3 are drivingly connected to the outer walls of the plurality of rotating rollers 2. Two adjustment boxes 5 are symmetrically arranged at the bottom ends on both sides inside the transfer rack 1. A transmission structure 4 for driving the conveyor belt 3 to operate is arranged at the upper end of the adjustment box 5. An adjustment structure 53 is arranged inside the adjustment box 5;

[0028] The adjusting structure 53 includes a number of first adjusting rods 535 and second adjusting rods 536 disposed inside the adjusting box 5, and an adjusting motor 531 mounted on the outer wall of the adjusting box 5. The output end of the adjusting motor 531 extends into the adjusting box 5 where it is fixedly connected to a bidirectional screw rod 532. The other end of the bidirectional screw rod 532 is fixed to the bidirectional screw rod 532 inside another adjusting box 5 through a long rod 533. Both ends of the bidirectional screw rod 532 are threadedly connected to first adjusting blocks 534. The inner wall of the adjusting box 5 is symmetrically provided with moving grooves 542, inside which moving rods 541 slide. Second adjusting blocks 540 corresponding to the first adjusting blocks 534 slide on the moving rods 541. The upper ends of one first adjusting block 534 and one second adjusting block 540 are rotatably mounted with a first adjusting rod 535, and the upper ends of the other first adjusting block 534 and the other second adjusting block 540 are rotatably mounted with a second adjusting rod 536. The other end of the first adjusting rod 535 and the second adjusting rod 536 are rotatably connected through a shaft block 537. The middle of each first adjusting rod 535 and second adjusting rod 536 is connected to the transmission structure 4.

[0029] In this embodiment, when it is necessary to transport goods, first start the transmission structure 4, and the transmission structure 4 drives the conveyor belt 3 to move, forming a goods transmission path. If the goods are too large or too small, the transmission structure 4 can be adjusted by the adjusting structure 53 to adapt to the goods transportation.

[0030] Specifically, first, the adjusting motor 531 is used to drive the bidirectional screw rods 532 inside the two adjusting boxes 5 to rotate synchronously, so that the first adjusting blocks 534 at both ends of the bidirectional screw rod 532 move synchronously, and the moving rod 541 slides along the moving groove 542. At the same time, the movement of the first adjusting block 534 will drive the second adjusting block 540 to slide on the moving rod 541 and change the angles of the first adjusting rod 535 and the second adjusting rod 536, which changes the distance between two adjacent transmission structures 4, thus facilitating the goods transportation.

[0031] In an alternative embodiment, the transmission structure 4 includes a number of U-shaped frames 401. An upper movable opening 51 matching the U-shaped frame 401 is formed at the upper end of the adjustment box 5. The outer wall of the U-shaped frame 401 is slidably connected to the inner wall of the upper movable opening 51. A fixed circular block 4011 is fixed in the middle of the bottom end of the U-shaped frame 401. The fixed circular block 4011 is rotatably connected to the first adjusting rod 535 and the second adjusting rod 536. A contact roller 402 is rotatably installed inside the U-shaped frame 401. The outer wall of the contact roller 402 is drivingly connected to the transmission belt 3. Auxiliary rollers 403 are rotatably installed on both sides of the U-shaped frame 401. The contact roller 402 is fixed to the two auxiliary rollers 403. A rectangular opening 404 is formed through the middle of the contact roller 402 and the two auxiliary rollers 403. A rectangular rod 405 matching the rectangular opening 404 is rotatably installed inside the transfer frame 1. One end of the rectangular rod 405 is fixedly connected to the output end of a transport motor 406 installed on the outer wall of the transfer frame 1.

[0032] It should be noted that the rectangular opening 404 and the rectangular rod 405 cooperate with each other, so that when the adjustment structure 53 adjusts the spacing of the transmission structure 4, the contact roller 402 and the two auxiliary rollers 403 can slide along the rectangular rod 405; when goods need to be transported, the transport motor 406 drives the rectangular rod 405 to rotate, and the rectangular rod 405 drives the contact roller 402 and the two auxiliary rollers 403 to rotate, thereby driving the transmission belt 3 to run and forming a goods transmission path.

[0033] In an alternative embodiment, a sliding block 538 is fixed to the lower end of the shaft block 537. A connecting plate 539 is provided below the shaft block 537. Side movable openings 52 matching the connecting plate 539 are formed at the opposite ends of the two adjustment boxes 5. A sliding groove 5391 is formed at the upper end of the connecting plate 539. The outer wall of the sliding block 538 is slidably connected to the inner wall of the sliding groove 5391. The connecting plate 539 is connected to an anti-clamping structure 6. The anti-clamping structure 6 is arranged between two adjacent transmission belts 3. The anti-clamping structure 6 includes a number of J-shaped guide plates 601 and a number of elastic telescopic rods 604. A number of the elastic telescopic rods 604 are fixed to the upper end of the connecting plate 539. Two of the elastic telescopic rods 604 among the number of elastic telescopic rods 604 are taken as a group. The top of the telescopic end of each group of elastic telescopic rods 604 is fixed with a J-shaped guide plate 601. A number of runners 602 are rotatably installed at the upper end of the J-shaped guide plate 601.

[0034] In an alternative embodiment, spring grooves 611 are symmetrically formed on both sides of the J-shaped guide plate 601. A first spring 631 is fixed inside the spring grooves 611. One end of the first spring 631 away from the spring grooves 611 is fixedly connected to an extension plate 603. Two adjacent extension plates 603 are in contact with each other.

[0035] It should be noted that when the adjustment structure 53 adjusts the transmission structure 4 to adapt to cargo transportation, the sliding block 538 cooperates with the chute 5391 to drive the connecting plate 539 to adjust accordingly, so that the anti-jamming seam structure 6 on the connecting plate 539 is always located between two adjacent conveyor belts 3. The arc surface design of the J-shaped guide plate 601 can effectively guide the angular part of the cargo package to move out from between two adjacent conveyor belts 3, avoiding small-sized cargo packages from getting stuck between the conveyor belts 3. Moreover, the rotating wheel 602 rotatably installed on the J-shaped guide plate 601 is beneficial to reducing the friction force between the cargo and the surface of the J-shaped guide plate 601, thus preventing the cargo from being unable to move due to excessive weight. The first spring 631 and the extension plate 603 cooperate to fill the gap between two adjacent conveyor belts 3, preventing the cargo from falling through the gap.

[0036] In an alternative embodiment, the middle part of the lower end of the J-shaped guide plate 601 is fixedly connected to a fixing ring 606 through a fixing rod 605. The fixing ring 606 is connected to the tensioning structure 7. The tensioning structure 7 includes a tensioning roller 705 rotatably installed inside the fixing ring 606. The bottom of the side wall of the tensioning roller 705 is in contact with the conveyor belt 3. The tensioning roller 705 is rotatably installed between two movable blocks 704. The upper ends of the movable blocks 704 are fixed with movable telescopic rods 702 and second springs 703. The movable telescopic rods 702 are arranged inside the second springs 703. The upper ends of the movable telescopic rods 702 and the second springs 703 are fixedly connected to a fixing block 701. The fixing block 701 is fixed to the outer wall of the transfer rack 1. A tensioning opening 11 matching the tensioning roller 705 is provided on the transfer rack 1.

[0037] It should be noted that when the cargo moves onto the J-shaped guide plate 601, the gravity of the cargo causes the elastic telescopic rod 604 to be compressed and move downward, so that the J-shaped guide plate 601 moves downward. The fixing rod 605 and the fixing ring 606 fixed to the J-shaped guide plate 601 move downward accordingly, and then the tensioning roller 705 moves downward to increase the tension of the conveyor belt 3, further improving the friction force between the conveyor belt 3 and the contact roller 402, thereby enhancing the transmission efficiency and ensuring the smooth transportation of the cargo. When the cargo leaves the position of the J-shaped guide plate 601, the elastic telescopic rod 604 and the second spring 703 rebound to reset the tensioning roller 705 and the J-shaped guide plate 601.

[0038] The above embodiment discloses a cargo transfer device for warehousing logistics. Among them, when it is necessary to transfer cargo, first start the transport motor 406. The output end of the motor drives the rectangular rod 405 to rotate. The rectangular rod 405 then drives the contact roller 402 and two auxiliary rollers 403 to rotate. Since the outer wall of the contact roller 402 is in driving connection with the conveyor belt 3, the conveyor belt 3 starts to operate, forming a cargo transfer path.

[0039] If the size of the goods is too large or too small, the distance between the conveyor belts 3 needs to be adjusted to accommodate the transportation of the goods. At this time, the adjustment motor 531 is started, and the output end of the motor drives the bidirectional screw 532 to rotate. Since both ends of the bidirectional screw 532 are threadedly connected to the first adjusting block 534, the first adjusting block 534 will move in opposite directions synchronously. At the same time, the movable rod 541 slides along the movable groove 542, and the movement of the first adjusting block 534 drives the second adjusting block 540 to slide on the movable rod 541, thereby changing the angles of the first adjusting rod 535 and the second adjusting rod 536. This change causes the U-shaped frame 401 and the transmission structure 4 thereon to slide along the upper movable opening 51, adjusting the distance between adjacent conveyor belts 3.

[0040] During the transmission process, the J-shaped guide plate 601 in the anti-jamming seam structure 6 is fixed to the connecting plate 539 through the elastic telescopic rod 604. The connecting plate 539 moves with the adjustment of the adjustment structure 53, ensuring that the J-shaped guide plate 601 is always located between adjacent conveyor belts 3. The arc surface design of the J-shaped guide plate and the runner 602 help to guide the angular parts of the goods package to smoothly move out between the conveyor belts 3, avoiding jamming. The cooperation of the first spring 631 and the extension plate 603 further fills the gap between the conveyor belts 3, preventing the goods from falling.

[0041] When the goods move onto the J-shaped guide plate 601, their gravity will compress the elastic telescopic rod 604, thereby driving the fixed ring 606 and the tensioning roller 705 to move downward. The downward movement of the tensioning roller 705 increases the tension of the conveyor belt 3, improves the friction between the conveyor belt 3 and the contact roller 402, and thus enhances the transmission efficiency. When the goods leave the position of the J-shaped guide plate 601, the elastic telescopic rod 604 and the second spring 703 rebound, resetting the tensioning roller 705 and the J-shaped guide plate 601.

[0042] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A cargo transfer device for warehousing logistics, characterized in that: The invention comprises a transfer frame (1), wherein a plurality of rollers (2) are rotatably mounted inside the transfer frame (1), and the outer walls of the plurality of rollers (2) are transmission-connected to a plurality of conveyor belts (3), two adjustment boxes (5) are symmetrically arranged at the bottom ends of both sides inside the transfer frame (1), a transmission structure (4) for driving the conveyor belts (3) to operate is arranged at the upper end of the adjustment box (5), and an adjustment structure (53) is arranged inside the adjustment box (5); The adjustment structure (53) comprises a plurality of adjustment rods (535) and (536) arranged inside the adjustment box (5), and an adjustment motor (531) mounted on the outer wall of the adjustment box (5); the output end of the adjustment motor (531) extends to the inside of the adjustment box (5) and is fixedly connected to a bidirectional screw rod (532); the other end of the bidirectional screw rod (532) is fixed to a bidirectional screw rod (532) inside another adjustment box (5) through a long rod (533); both ends of the bidirectional screw rod (532) are threadedly connected to an adjustment block (534); the inner wall of the adjustment box (5) is symmetrically provided with movable grooves (542); A movable rod (541) is slidably mounted between the two adjusting blocks, and an adjusting block (540) corresponding to the adjusting block (534) is slidably mounted on the movable rod (541); an adjusting rod (535) is rotatably mounted on the upper end of one adjusting block (534) and one adjusting block (540); an adjusting rod (536) is rotatably mounted on the upper end of another adjusting block (534) and another adjusting block (540); the other end of the adjusting rod (535) is rotatably connected to the adjusting rod (536) via a shaft block (537); and the middle of each adjusting rod (535) and each adjusting rod (536) is connected to the transmission structure (4).

2. A cargo transfer device for warehousing logistics according to claim 1, characterized in that: The transmission structure (4) comprises a plurality of U-shaped frames (401); an upper movable opening (51) matching the U-shaped frame (401) is provided at the upper end of the adjustment box (5); the outer wall of the U-shaped frame (401) is slidably connected to the inner wall of the upper movable opening (51); a fixed round block (4011) is fixed to the middle of the bottom end of the U-shaped frame (401); the fixed round block (4011) is rotatably connected to the first adjustment rod (535) and the second adjustment rod (536); a contact roller (402) is rotatably installed inside the U-shaped frame (401); the contact roller (402) is rotatably installed inside the U-shaped frame (401); and the contact roller (402) is rotatably connected to the first adjustment rod (535) and the second adjustment rod (536). 2) the outer wall is connected to the transmission belt (3), auxiliary rollers (403) are rotatably installed on both sides of the U-shaped frame (401), the contact roller (402) is fixed to the two auxiliary rollers (403), a rectangular opening (404) is opened through the middle of the contact roller (402) and the two auxiliary rollers (403), a rectangular rod (405) matching the rectangular opening (404) is rotatably installed inside the transfer frame (1), and one end of the rectangular rod (405) is fixedly connected to the output end of a transport motor (406) installed on the outer wall of the transfer frame (1).

3. A cargo transfer device for warehousing logistics according to claim 1, characterized in that: A sliding block (538) is fixed at the lower end of the shaft block (537), a connecting plate (539) is provided below the shaft block (537), side movable openings (52) matching the connecting plate (539) are provided at opposite ends of the two adjustment boxes (5), a sliding groove (5391) is provided at the upper end of the connecting plate (539), the outer wall of the sliding block (538) is slidably connected to the inner wall of the sliding groove (5391), the connecting plate (539) is connected to the anti-stuck seam structure (6), and the anti-stuck seam structure (6) is arranged on Between two adjacent conveyor belts (3), the anti-stuck seam structure (6) comprises a plurality of J-shaped guide plates (601) and a plurality of elastic telescopic rods (604), wherein the plurality of elastic telescopic rods (604) are fixed to the upper end of a connecting plate (539), two of the plurality of elastic telescopic rods (604) form a group, a J-shaped guide plate (601) is fixed to the top of the telescopic end of each group of the elastic telescopic rods (604), and a plurality of rotating wheels (602) are rotatably mounted on the upper end of the J-shaped guide plate (601).

4. A cargo transfer device for warehousing logistics according to claim 3, characterized in that: The J-shaped guide plate (601) has spring grooves (611) symmetrically formed on both sides. A spring 1 (631) is fixed inside the spring groove (611). One end of the spring 1 (631) away from the spring groove (611) is fixedly connected to the extension plate (603). Two adjacent extension plates (603) are in contact with each other.

5. The cargo transfer device for warehousing logistics according to claim 3, characterized in that: The middle part of the lower end of the J-shaped guide plate (601) is fixedly connected to a fixing ring (606) through a fixing rod (605); the fixing ring (606) is connected to a tensioning structure (7); the tensioning structure (7) comprises a tensioning roller (705) rotatably mounted inside the fixing ring (606); the bottom of the side wall of the tensioning roller (705) is in contact with the conveyor belt (3); the tensioning roller (705) is rotatably mounted between two movable blocks (704); a movable telescopic rod (702) and a second spring (703) are fixed to the upper end of the movable block (704); the movable telescopic rod (702) is arranged inside the second spring (703); the upper ends of the movable telescopic rod (702) and the second spring (703) are fixedly connected to a fixing block (701); the fixing block (701) is fixed to the outer wall of the transfer frame (1); and a tensioning opening (11) matching the tensioning roller (705) is provided on the transfer frame (1).

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