Length-adjustable Teflon conveying belt
By designing a Teflon conveyor belt including a fixed shell, hollow rod, sliding pressure plate, limit rod, limit block and fixed components, the problem of difficult adjustment of the fixed length design of traditional conveyor belts is solved, and flexible adjustment of the conveyor belt length and uniform distribution of tension are achieved, and production efficiency and equipment service life are improved.
Patent Information
- Application Number
- CN202510430346.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-08
- Publication Date
- 2025-06-06
AI Technical Summary
The fixed length design of traditional Teflon conveyor belts is difficult to flexibly adjust, resulting in the need to replace the entire conveyor belt when the production line layout is changed or the equipment maintenance and upgrade, which increases time and cost, and cannot adapt to changes in equipment and production parameters of different specifications.
A Teflon conveyor belt including a fixed shell, hollow rod, sliding pressure plate, limit rod, limit block and fixed components is designed. Through the cooperation of these components, stable clamping and rapid release of the left and right ends of the conveyor belt can be achieved, allowing length adjustment, and ensuring even distribution of the tension of the conveyor belt through components such as rotating rod and worm gear.
It realizes flexible adjustment of the length of the conveyor belt, reduces maintenance time and cost, improves the working stability and service life of the conveyor belt, and ensures the continuity and efficiency of material transmission.
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Figure CN120096988A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of conveyors, and in particular to a Teflon conveyor belt with adjustable length. Background Art
[0002] In modern industrial production, conveyor belts, as key components for material transmission, are widely used in food processing, electronic manufacturing, packaging industry and various automated production lines. Among them, Teflon (polytetrafluoroethylene, PTFE) conveyor belts are highly favored due to their excellent high temperature resistance, anti-adhesion and chemical stability. However, despite the many advantages of Teflon conveyor belts, they still face some challenges in practical applications, especially in terms of length adjustment.
[0003] Traditional Teflon conveyor belts are usually designed with fixed lengths. When installing or replacing, they need to be customized according to the specific equipment size, which not only increases the time cost of preliminary preparation, but also may lead to material waste. For production equipment of different specifications, it is necessary to re-order a specific length of conveyor belt each time, which is neither economical nor efficient for enterprises. In addition, due to the requirements of the production process, the conveying path may need to be temporarily adjusted in some cases, which requires the conveyor belt to be able to flexibly adapt to different length requirements, and the existing fixed length design obviously cannot meet this requirement.
[0004] In actual operation, when the layout of the production line is changed or equipment maintenance and upgrade is required, the length of the conveyor belt often needs to be adjusted accordingly. However, the traditional way of achieving such adjustment usually means replacing the entire conveyor belt, which is a time-consuming and costly process. Moreover, even on the same production line, due to the change in the size of different batches of products, the effective working length of the conveyor belt may need to be adjusted to match the new production parameters. For example, in the food processing industry, when handling products of different sizes and shapes, the length of the conveyor belt needs to be changed to ensure the best operating efficiency and product quality. Therefore, how to overcome the limitations of the existing Teflon conveyor belt in length adjustment has become a technical problem that needs to be solved urgently. Especially in the pursuit of efficient and flexible modern production mode, it is particularly important to develop a Teflon conveyor belt that can adjust the length conveniently and quickly. Summary of the invention
[0005] In view of this, the present invention provides a Teflon conveyor belt with adjustable length, which can overcome the disadvantage that the existing Teflon conveyor belt is usually designed with a fixed length. When installing or replacing, it needs to be customized according to the specific equipment size, and the length cannot be flexibly adjusted as needed, which not only increases the time cost of preliminary preparation, but also requires ordering conveyor belts of various specific lengths for production equipment of different specifications, which is more costly.
[0006] A length-adjustable Teflon conveyor belt comprises: a conveyor belt body; a fixed shell connected to one end of the conveyor belt body; a hollow rod symmetrically connected to the top of the fixed shell; a sliding pressure plate slidably connected to the fixed shell, the sliding pressure plate cooperates with the fixed shell to clamp and fix one end of the conveyor belt body, and the hollow rod movably passes through the sliding pressure plate, and the top of the sliding pressure plate is symmetrically provided with vertical grooves; a limiting rod connected to the outer wall of the hollow rod, and the bottom of the limiting rod is symmetrical with the fixed shell. The top of the sliding pressure plate contacts to limit the sliding pressure plate; a limit block is connected to the outer wall of the hollow rod, and the bottom of the limit block contacts the top of the sliding pressure plate to limit the sliding pressure plate. When the hollow rod rotates ninety degrees, it can drive the limit block and the limit rod to rotate ninety degrees until they are vertically aligned with the vertical groove to release the limitation of the sliding pressure plate; a fixing component is arranged at the other end of the conveyor belt body, and is used to clamp and fix the other end of the conveyor belt body.
[0007] Further description, the fixing assembly includes: a fixed clamping plate; a rotating clamping plate, which is rotatably connected to the fixed clamping plate, and the rotating clamping plate and the fixed clamping plate cooperate to clamp and fix the other end of the conveyor belt body; a torsion spring, which is wound around the rotating axis of the rotating clamping plate, and the two ends of the torsion spring are respectively connected to the rotating clamping plate and the fixed clamping plate.
[0008] Further description, it also includes: first tooth blocks, which are evenly spaced and connected to the sides of the rotating clamping plate and the fixed clamping plate that are close to each other, and the first tooth blocks are in contact with the conveyor belt body.
[0009] Further description, it also includes: a rotating rod connected to the inside of the fixed shell; second tooth blocks symmetrically and evenly connected to the two ends of the rotating rod at circumferential intervals, and the second tooth blocks are in contact with the conveyor belt body; a rotating assembly is arranged on the hollow rod, and is used to drive the rotating rod to rotate.
[0010] Further description, the rotating assembly includes: a worm wheel, symmetrically connected to the two ends of the rotating rod; a rotating block, rotatably connected to the inside of the hollow rod, and a hexagonal hole is opened on the top of the rotating block; a worm, rotatably connected to the inside of the hollow rod, and the top of the worm is connected to the bottom of the rotating block, and the worm is meshed with the worm wheel.
[0011] Further description, it also includes: an elastic clamping rod, a square groove is opened on the top of the sliding pressure plate, the elastic clamping rod is connected to the square groove, and a clamping groove is opened on the elastic clamping rod, the limit rod is located in the clamping groove, and is used to lock the limit rod.
[0012] It is further explained that the elastic clamping rod is arranged obliquely, and an arc-shaped protrusion is provided at one end of the elastic clamping rod, and the arc-shaped protrusion protrudes out of the top of the square groove.
[0013] Further description, it also includes: a first flexible magnet, connected between the two fixed clamps; an elastic rope, symmetrically connected to the inside of the rotating clamp; a second flexible magnet, connected between the ends of the elastic rope in the two rotating clamps, and the second flexible magnet is located directly above the first flexible magnet, and the second flexible magnet and the first flexible magnet are both in contact with the conveyor belt body.
[0014] The beneficial effects of the present invention are as follows: 1. The present invention can achieve stable clamping and quick release of the left and right ends of the conveyor belt through the cooperation of the fixed shell, the hollow rod, the sliding pressure plate, the limit rod, the limit block and the fixed assembly, so that the user can adjust the length without disassembling the entire conveyor belt. The operation is simple and maintenance time and cost can be reduced.
[0015] 2. The present invention can tighten the conveyor belt body as a whole and ensure its uniform tension distribution through the joint action of the rotating rod, the second tooth block, the worm wheel, the rotating block and the worm. Specifically, the rotating block is driven by an electric tool, which in turn drives the worm and the worm wheel to rotate, so that the second tooth block on the rotating rod gradually tightens the conveyor belt and finally achieves an ideal tightening state. Since the worm wheel and the worm have a self-locking function, the system can be automatically locked after the external force stops being applied to prevent the conveyor belt from loosening. This can not only improve the working stability of the conveyor belt and extend its service life, but also ensure that there will be no slipping during material transmission, thereby ensuring the continuity and efficiency of production.
[0016] 3. The present invention can effectively close the edge gap of the overlapping part of the conveyor belt body through the synergistic effect of the sliding pressure plate, the fixed shell, the first flexible magnet and the second flexible magnet. The sliding pressure plate and the fixed shell cooperate to clamp the left end of the conveyor belt, and at the same time block the gap between the left edge of the conveyor belt and the surface, while the first flexible magnet and the second flexible magnet attract each other through magnetic force, tightly fitting the right edge of the conveyor belt to the surface of the conveyor belt, further closing the gap at the right end. This design can significantly reduce the possibility of material entering the interlayer of the overlapping part of the conveyor belt, and avoid problems such as poor operation or damage of the conveyor belt due to material getting stuck. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.
[0018] Figure 2 It is a schematic diagram of the specific structure of the fixed shell, the hollow rod and the sliding pressure plate of the present invention.
[0019] Figure 3It is a schematic diagram of the separation structure of the fixed shell and the sliding pressure plate of the present invention.
[0020] Figure 4 It is a schematic diagram of the specific structure of the hollow rod, the limiting rod and the limiting block of the present invention.
[0021] Figure 5 It is a schematic diagram of the specific structure of the fixed clamping plate, the rotating clamping plate, the torsion spring and the first tooth block of the present invention.
[0022] Figure 6 It is a schematic diagram of the installation of the rotating rod, the second gear block and the worm gear of the present invention.
[0023] Figure 7 It is a schematic diagram of the installation of the rotating block and the worm gear of the present invention.
[0024] Figure 8 It is a schematic diagram of the installation of the elastic clamping rod of the present invention.
[0025] Fig. 9 It is a schematic diagram of the specific structure of the elastic clamping rod of the present invention.
[0026] Fig.10 It is a schematic diagram of the installation of the first flexible magnet and the second flexible magnet of the present invention.
[0027] Fig.11 It is a schematic diagram of the installation of the elastic rope of the present invention.
[0028] In the above drawings: 1-conveyor belt body, 2-fixed shell, 3-hollow rod, 4-sliding pressure plate, 401-vertical groove, 5-limit rod, 6-limit block, 7-fixed splint, 8-rotating splint, 9-torsion spring, 10-first tooth block, 11-rotating rod, 12-second tooth block, 13-worm gear, 14-rotating block, 1401-hexagonal hole, 15-worm, 16-square groove, 17-elastic clamping rod, 1701-slot, 1702-arc-shaped protrusion, 18-first flexible magnet, 19-elastic rope, 20-second flexible magnet. DETAILED DESCRIPTION
[0029] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which currently preferred embodiments of the present invention are shown. However, the present invention can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and these embodiments fully convey the scope of the present invention to the skilled person.
[0030] Embodiment: A length-adjustable Teflon conveyor belt, such as Figure 1-Figure 5As shown, it includes a conveyor belt body 1, a fixed shell 2, a hollow rod 3, a sliding pressure plate 4, a limiting rod 5, a limiting block 6 and a fixed component. The conveyor belt body 1 is wound into a ring as a whole, and there is an overlapping part on the upper part of the conveyor belt body 1. The thickness of the conveyor belt body 1 is about one millimeter. The edges of the front and rear sides of the conveyor belt body 1 are provided with protective layers. The left end of the conveyor belt body 1 is connected to the fixed shell 2. The top of the fixed shell 2 is an open design. The top of the fixed shell 2 is symmetrically rotated and connected with the hollow rod 3. The upper part of the fixed shell 2 is slidably connected with the sliding pressure plate 4. The sliding pressure plate 4 cooperates with the fixed shell 2 to fix the left end of the conveyor belt body 1, and the two hollow The rods 3 are movable and penetrate the sliding pressure plate 4. Vertical grooves 401 are opened on the front and rear sides of the top of the sliding pressure plate 4. The upper parts of the sides where the outer walls of the two hollow rods 3 are close to each other are connected to the limiting rod 5, and the upper parts of the sides where the outer walls of the two hollow rods 3 are away from each other are connected to the limiting block 6. The bottom of the limiting rod 5 and the bottom of the limiting block 6 are in contact with the top of the sliding pressure plate 4 to limit the sliding pressure plate 4. When the hollow rod 3 rotates ninety degrees, it can drive the limiting block 6 and the limiting rod 5 to rotate ninety degrees until they are vertically aligned with the vertical groove 401 to release the limitation of the sliding pressure plate 4. A fixing component is provided at the right end of the conveyor belt body 1 for fixing the right end of the conveyor belt body 1.
[0031] like Figure 5 As shown, the fixing assembly includes a fixed splint 7, a rotating splint 8, a torsion spring 9 and a first tooth block 10. The number of the fixed splints 7 is two, and the two fixed splints 7 are symmetrically arranged front to back. The upper parts of the two fixed splints 7 are rotatably connected with the rotating splint 8. The rotating splint 8 cooperates with the fixed splint 7 to clamp and fix the right end of the conveyor belt body 1. The rotating axes of the two rotating splints 8 are wound with torsion springs 9, and the two ends of the torsion spring 9 are respectively connected to the rotating splint 8 and the fixed splint 7. A plurality of first tooth blocks 10 are evenly spaced and connected to the side where the rotating splint 8 and the fixed splint 7 are close to each other. The first tooth blocks 10 on the front and rear sides are respectively in contact with the protective layer at the front and rear edges of the conveyor belt body 1.
[0032] like Figure 6 and Figure 7 As shown, it also includes a rotating rod 11, a second tooth block 12 and a rotating assembly. The rotating rod 11 is rotatably connected inside the fixed shell 2. The outer walls of the front and rear ends of the rotating rod 11 are circumferentially evenly spaced with multiple second tooth blocks 12. The second tooth blocks 12 on the front and rear sides are respectively in contact with the protective layers at the front and rear edges of the conveyor belt body 1. The hollow rod 3 is provided with a rotating assembly for driving the rotating rod 11 to rotate; the rotating assembly includes a worm wheel 13, a rotating block 14 and a worm 15. The front and rear ends of the rotating rod 11 are connected to the worm wheel 13. The two hollow rods 3 are rotatably connected with the rotating blocks 14 and the worm 15, and the top of the worm 15 is connected to the bottom of the rotating block 14. The tops of the two rotating blocks 14 are each provided with a hexagonal hole 1401, and the worm 15 is meshed with the worm wheel 13.
[0033] like Figure 8 and Fig. 9 As shown, it also includes an elastic clamping rod 17, and square grooves 16 are opened on the front and rear sides of the top of the sliding pressure plate 4. The two square grooves 16 are connected to the elastic clamping rod 17. The elastic clamping rod 17 is inclined and has a clamping groove 1701. The limit rod 5 is located in the clamping groove 1701, which is used to lock the limit rod 5. The right ends of the two elastic clamping rods 17 are provided with arc-shaped protrusions 1702, and the arc-shaped protrusions 1702 protrude from the top of the square groove 16.
[0034] like Fig.10 and Fig.11 As shown, it also includes a first flexible magnet 18, an elastic rope 19 and a second flexible magnet 20. The first flexible magnet 18 is connected between the two fixed clamps 7 on the front and rear sides, and two elastic ropes 19 are connected inside the two rotating clamps 8 on the front and rear sides. The second flexible magnet 20 is connected between the ends of the four elastic ropes 19 that are close to each other. The second flexible magnet 20 is located directly above the first flexible magnet 18, and the second flexible magnet 20 and the first flexible magnet 18 are both in contact with the conveyor belt body 1.
[0035] Initially, the limit rod 5 and the limit block 6 are both located in the vertical groove 401; when the conveyor belt body 1 needs to be used, the conveyor belt body 1 is firstly put on the two conveyor wheels, and the conveyor belt body 1 is straightened, such as Figure 1As shown, the excess part of the conveyor belt body 1 is overlapped on its upper part; then the sliding pressure plate 4 is pushed downward along the hollow rod 3, and the sliding pressure plate 4 cooperates with the fixed shell 2 to fix the left end of the conveyor belt body 1 on the conveyor belt body 1, and the sliding pressure plate 4 and the fixed shell 2 can block the gap between the left end edge of the conveyor belt body 1 and the surface of the conveyor belt body 1 to prevent materials from entering the interlayer of the overlapping part of the conveyor belt body 1. At this time, the limit rod 5 and the limit block 6 will both protrude from the top of the vertical groove 401, and then the hollow rod 3 is rotated ninety degrees, which can drive the limit rod 5 and the limit block 6 to rotate ninety degrees. When the limit rod 5 contacts the top of the elastic clamping rod 17, the limit rod 5 squeezes the elastic clamping rod 17 to bend downward and deform. When the positioning rod 5 is aligned with the slot 1701, the elastic locking rod 17 will return to its original state due to its own elasticity, so that the limiting rod 5 is stuck in the slot 1701, thereby locking the limiting rod 5, making the bottom of the limiting rod 5 and the limiting block 6 contact with the top of the sliding pressure plate 4, so that the sliding pressure plate 4 can be limited, completing the preliminary fixation of the left end of the conveyor belt body 1, so that the second tooth block 12 can penetrate the protective layer at the front and rear edges of the conveyor belt body 1; then insert the hexagonal drill bit of the power tool into the hexagonal hole 1401, and then use the power tool to drive the rotating block 14 to rotate, the rotating block 14 can drive the worm 15 to rotate, the worm 15 can drive the worm wheel 13 to rotate, and the worm wheel 13 can drive the rotating rod 11 and the second tooth block 12 The second tooth block 12 can be rotated, and the upper part of the conveyor belt body 1 can be pulled to the right, so that the conveyor belt body 1 can be tightened, so that the conveyor belt body 1 is fully tightened on the two conveying wheels. Then the hexagonal drill bit of the power tool can be taken out from the inner hexagonal hole 1401. Under the self-locking effect of the worm wheel 13 and the worm 15, the worm wheel 13 will not reverse, thereby preventing the conveyor belt body 1 from loosening and detaching from the conveying wheel; then the two rotating clamps 8 can be rotated upward to open, the torsion spring 9 will be deformed, and the elastic rope 19 will be stretched, and then the fixed clamps 7 and the rotating clamps 8 on the front and rear sides are respectively placed on the front and rear sides of the right end of the conveyor belt body 1, and then the rotating clamps 8 are released, and the torsion springs 9 and the elastic ropes 19 will return to their original state. The movable rotating clamp 8 is rotated downward and closed, and the right end of the conveyor belt body 1 can be fixed on the conveyor belt body 1 through the cooperation of the fixed clamp 7 and the rotating clamp 8. At this time, the first tooth blocks 10 on the fixed clamp 7 and the rotating clamp 8 will penetrate into the protective layer at the front and rear edges of the conveyor belt body 1 to prevent the right end of the conveyor belt body 1 from warping, and the first flexible magnet 18 and the second flexible magnet 20 will attract each other through magnetic force, so that the right end edge of the conveyor belt body 1 can fit the surface of the conveyor belt body 1, and the first flexible magnet 18 and the second flexible magnet 20 can block the gap between the right end edge of the conveyor belt body 1 and the surface of the conveyor belt body 1, preventing materials from entering the interlayer of the overlapping part of the conveyor belt body 1;When the conveyor belt body 1 needs to be disassembled, first rotate the rotating clamp plate 8 upward to open it, so that the fixed clamp plate 7 and the rotating clamp plate 8 can loosen the right end of the conveyor belt body 1, and then press the arc-shaped protrusion 1702 on the elastic clamp rod 17 downward to make the elastic clamp rod 17 bend downward and deform, and the limit rod 5 will be disengaged from the clamping groove 1701, and then the hollow rod 3 can be rotated 90 degrees in the opposite direction, and the hollow rod 3 will drive the limit rod 5 and the limit block 6 to rotate 90 degrees in the opposite direction to align with the vertical groove 401, and then pull the sliding pressure plate 4 upward to make the sliding pressure plate 4 and the fixed shell 2 loosen the left end of the conveyor belt body 1, and then the conveyor belt body 1 can be removed from the conveying wheel, and the above operation can be repeated to install the conveyor belt body 1 on other conveying wheels. By adjusting the length of the overlapping part of the upper part of the conveyor belt body 1, it can adapt to conveying equipment of different specifications. ;
[0036] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A length-adjustable Teflon conveyor belt, comprising: a conveyor belt body (1); characterized in that: The conveyor belt conveyor further comprises: a fixed shell (2) connected to one end of the conveyor belt body (1); a hollow rod (3) symmetrically connected to the top of the fixed shell (2); a sliding pressure plate (4) slidably connected to the fixed shell (2); the sliding pressure plate (4) cooperates with the fixed shell (2) to clamp and fix one end of the conveyor belt body (1); the hollow rod (3) movably passes through the sliding pressure plate (4); the top of the sliding pressure plate (4) is symmetrically provided with vertical grooves (401); a limiting rod (5) connected to the outer wall of the hollow rod (3); the bottom of the limiting rod (5) is symmetrically connected to the sliding pressure plate ( 4) top contact to limit the sliding pressure plate (4); a limit block (6) connected to the outer wall of the hollow rod (3), and the bottom of the limit block (6) contacts the top of the sliding pressure plate (4) to limit the sliding pressure plate (4), when the hollow rod (3) rotates ninety degrees, it can drive the limit block (6) and the limit rod (5) to rotate ninety degrees to vertically align with the vertical groove (401) to release the limit on the sliding pressure plate (4); a fixing component is arranged at the other end of the conveyor belt body (1) and is used to clamp and fix the other end of the conveyor belt body (1).
2. A length-adjustable Teflon conveyor belt according to claim 1, characterized in that: The fixing assembly comprises: a fixing clamp (7); a rotating clamp (8) rotatably connected to the fixing clamp (7), and the rotating clamp (8) cooperates with the fixing clamp (7) to clamp and fix the other end of the conveyor belt body (1); and a torsion spring (9) wound around the rotating axis of the rotating clamp (8), and the two ends of the torsion spring (9) are respectively connected to the rotating clamp (8) and the fixing clamp (7).
3. A length-adjustable Teflon conveyor belt according to claim 2, characterized in that: It also includes: first tooth blocks (10) which are evenly spaced and connected to the sides of the rotating clamping plate (8) and the fixed clamping plate (7) that are close to each other, and the first tooth blocks (10) are in contact with the conveyor belt body (1).
4. A length-adjustable Teflon conveyor belt according to claim 3, characterized in that: It also includes: a rotating rod (11) connected to the interior of the fixed shell (2); second tooth blocks (12) connected to both ends of the rotating rod (11) at symmetrical and evenly spaced intervals in the circumferential direction, and the second tooth blocks (12) are in contact with the conveyor belt body (1); and a rotating assembly arranged on the hollow rod (3) and used to drive the rotating rod (11) to rotate.
5. A length-adjustable Teflon conveyor belt according to claim 4, characterized in that: The rotating assembly comprises: a worm wheel (13) symmetrically connected to the two ends of the rotating rod (11); a rotating block (14) rotatably connected to the inside of the hollow rod (3), and a hexagonal hole (1401) is formed on the top of the rotating block (14); and a worm (15) rotatably connected to the inside of the hollow rod (3), and the top of the worm (15) is connected to the bottom of the rotating block (14), and the worm (15) is meshed with the worm wheel (13).
6. A length-adjustable Teflon conveyor belt according to claim 5, characterized in that: It also includes: an elastic clamping rod (17), a square groove (16) is formed on the top of the sliding pressure plate (4), the elastic clamping rod (17) is connected to the square groove (16), and a clamping groove (1701) is formed on the elastic clamping rod (17), the limiting rod (5) is located in the clamping groove (1701), and is used to lock the limiting rod (5).
7. A length-adjustable Teflon conveyor belt according to claim 6, characterized in that: The elastic clamping rod (17) is arranged at an angle, and an arc-shaped protrusion (1702) is provided at one end of the elastic clamping rod (17), wherein the arc-shaped protrusion (1702) protrudes from the top of the square groove (16).
8. A length-adjustable Teflon conveyor belt according to claim 7, characterized in that: The conveyor belt further comprises: a first flexible magnet (18) connected between the two fixed clamps (7); an elastic rope (19) symmetrically connected inside the rotating clamp (8); a second flexible magnet (20) connected between the ends of the elastic rope (19) inside the two rotating clamps (8), and the second flexible magnet (20) is located directly above the first flexible magnet (18), and the second flexible magnet (20) and the first flexible magnet (18) are both in contact with the conveyor belt body (1).