Pre-shearing suspension magnetic belt conveying device

Abstract

The utility model relates to the technical field of metallurgical steel rolling machinery, and discloses a pre-shearing suspension magnetic belt conveying device which comprises a base and a waste conveying device, the top of the base is fixedly connected with a head cutting flying shear frame, and the outer portion of the head cutting flying shear frame is fixedly connected with a fixed magnetic belt frame. A fixed magnetic force belt conveyor transmission roller is rotationally connected to the inner wall of the head flying shear frame, a swing magnetic force frame is rotationally connected to the interior of the fixed magnetic force belt frame, a first swing driven roller is rotationally connected to the interior of the fixed magnetic force belt frame, and a swing adjusting screw rod is rotationally connected to the interior of the fixed magnetic force belt frame; an adjusting piece is rotationally connected into the swing magnetic frame, and the swing adjusting screw penetrates through the adjusting piece. According to the suspension magnetic belt conveying device before shearing, when a head cutting flying shear shears, the swing magnetic frame rotates and is adjusted, the operation speed of a unit is not affected, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical rolling mill machinery technology, specifically to a pre-shearing suspended magnetic belt conveyor device. Background Technology

[0002] In the continuous annealing and finishing production line of cold-rolled strip steel, the strip head is often clamped by the cleats of the uncoiler and coiler drum, resulting in indentations and defective strip steel products. In order to prevent defective strip steel from entering the finished steel coil, an exit cutting flying shear device is generally installed on the exit side to cut off the strip head and cut off the strip steel so that it falls into the waste hopper.

[0003] In traditional designs, a lifting magnetic belt conveyor is installed after the flying shear to ensure that the scrap steel is lifted during shearing and falls into the scrap hopper. During belt threading, the magnetic belt conveyor lowers to maintain a horizontal position, providing support and conveying for the strip steel. However, during the lifting and lowering process of the magnetic belt conveyor, the speed of the hydraulic cylinder is limited, causing the unit to stagnate during the cylinder's ascent and descent, reducing production efficiency and increasing maintenance costs due to the increased hydraulic piping. When the telescopic magnetic belt conveyor is placed horizontally, the space between the equipment and the foundation is further compressed, making the arrangement of equipment below difficult. Therefore, there is an urgent need for a pre-shear suspended magnetic belt conveyor device to solve the above problems. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a shear-mounted magnetic belt conveyor device, which solves the problem that the lifting magnetic belt conveyor is limited by the speed of the hydraulic cylinder during the lifting process, causing the unit to stagnate and reducing production efficiency.

[0006] (II) Technical Solution

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A pre-shearing suspended magnetic belt conveyor device includes a base and a waste conveying device. A head-cutting flying shear frame is fixedly connected to the top of the base. A fixed magnetic belt frame is fixedly connected to the outside of the head-cutting flying shear frame. A fixed magnetic belt drive roller is rotatably connected to the inner wall of the head-cutting flying shear frame. A swinging magnetic frame is rotatably connected inside the fixed magnetic belt frame. A first swinging passive roller is rotatably connected inside the fixed magnetic belt frame. A second swinging passive roller is rotatably connected inside the swinging magnetic frame. A first tensioning roller group is arranged inside the fixed magnetic belt frame. A swinging belt electromagnet is fixedly installed inside the swinging magnetic frame. The magnetic belt frame is internally rotatably connected to a swing adjustment screw, and the swing magnetic frame is internally rotatably connected to an adjustment component. The swing adjustment screw passes through the adjustment component, and the external thread of the swing adjustment screw is connected to two swing adjustment nuts distributed at the upper and lower ends of the adjustment component. An upper suspended belt conveyor is provided on the top of the base, and a lower magnetic belt conveyor is provided on the top of the base. A first fixed guide plate is fixedly connected to the top of the base, and a second fixed guide plate is fixedly connected to the top of the base. The waste conveying device is located at the bottom of the base, and a track is provided on the top of the base. A waste collection device trolley is slidably connected to the surface of the track, and a waste collection hopper is fixedly connected to the top of the waste collection device trolley.

[0008] The beneficial effects of this utility model are:

[0009] This pre-shearing suspended magnetic belt conveyor eliminates the need for multiple adjustments after the swinging magnetic frame rotates and adjusts during the cutting process of the flying shear. This does not affect the unit's operating speed and improves production efficiency. It also eliminates the need for repeated adjustments during the lifting and lowering process of existing hydraulic cylinders. Furthermore, the number of hydraulic cylinder pipelines, valve platforms, and electrical control systems is reduced, saving space while adding double fixed guide plates and waste collection and waste transport vehicles. This enables rapid sorting, detection, and collection of waste materials, making it more convenient and efficient, and eliminating safety hazards.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, the first tensioning roller assembly includes a swing tensioning screw threadedly connected to the inside of the fixed magnetic belt frame. The swing tensioning screw is externally threaded with a swing tensioning nut. The inside of the fixed magnetic belt frame is rotatably connected to three swing tensioning rollers arranged in a triangular pattern via bearing seats. The bearing seats of the swing tensioning rollers are rotatably connected to the swing tensioning screw, and the bearing seats of the other two swing tensioning rollers are fixedly disposed inside the fixed magnetic belt frame.

[0012] The beneficial effect of adopting the above-mentioned further solution is that, through the cooperation of the swing tension screw and the swing tension nut, the position of the swing tension roller can be easily adjusted, thereby achieving precise adjustment of the conveyor belt tension, ensuring that the conveyor belt always maintains a suitable tension during operation, avoiding conveyor belt slippage or slack, and improving the stability and reliability of the conveyor.

[0013] Furthermore, a flying shear roller is rotatably connected inside the cutting flying shear frame, a shear blade is assembled inside the flying shear roller, an inlet guide plate is assembled inside the cutting flying shear frame, a first motor is fixedly installed on the back of the cutting flying shear frame, and the output shaft of the first motor is fixedly connected to the flying shear roller. The number of flying shear rollers is two.

[0014] The beneficial effects of adopting the above-mentioned further scheme are that the setting of the flying shear roller and the shear blade can achieve precise shearing of materials, the inlet guide plate can guide materials into the cutting head flying shear frame, ensuring the correct material conveying and shearing position, and the first motor provides power to the flying shear roller to ensure the smooth execution of the shearing action, thereby achieving efficient material shearing processing.

[0015] Furthermore, the fixed magnetic belt conveyor's drive roller, the first oscillating passive roller, the second oscillating passive roller, and the first tensioning roller group are all externally connected to a fixed belt.

[0016] The beneficial effects of adopting the above-mentioned further solution are that by connecting each roller with a fixed belt, the power transmission and conveyor belt drive are realized, enabling the conveyor belt to run stably, ensuring the continuity and stability of the material during the conveying process, and at the same time facilitating the adjustment of the tension of the conveyor belt to ensure the normal operation of the conveyor belt.

[0017] Furthermore, the upper suspended belt conveyor includes an upper suspended belt conveyor frame fixedly connected to the top of the base. A second tensioning roller group is arranged inside the upper suspended belt conveyor frame. An installation component is fixedly connected inside the upper suspended belt conveyor frame. A belt roller adjusting screw is laterally slidably connected inside the installation component. Two belt roller adjusting nuts, distributed at the left and right ends of the installation component, are threadedly connected to the external of the belt roller adjusting screw. An upper belt adjusting roller is rotatably connected to the belt roller adjusting screw through a bearing seat. An adjusting belt roller is fixedly connected to the external of the upper belt adjusting roller.

[0018] The beneficial effect of adopting the above-mentioned further solution is that, through the cooperation of the belt roller adjusting screw and the belt roller adjusting nut, the position of the upper belt adjusting roller can be easily adjusted, ensuring the accurate running direction of the conveyor belt and improving the stability and reliability of the conveying.

[0019] Furthermore, there are two adjusting belt rollers, which are distributed at both ends of the upper suspended belt conveyor frame. A first electromagnet is fixedly installed inside the upper suspended belt conveyor frame, and the two adjusting belt rollers and the second tensioning roller group are all connected to the outside of the first belt.

[0020] The beneficial effect of adopting the above-mentioned further solution is that the setting of the first electromagnet can realize the attraction of the steel belt to the first belt, thereby realizing the stable conveying of the steel belt. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the fixed magnetic belt frame in this utility model;

[0023] Figure 3 This is a schematic diagram of the mounting component in this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the upper belt adjusting roller in this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the first electromagnet in this utility model.

[0026] In the diagram: 1. Flying shear frame; 2. Inlet guide plate; 31. Fixed magnetic belt frame; 32. Fixed magnetic belt conveyor drive roller; 33. Fixed belt; 34. First oscillating passive roller; 35. Second oscillating passive roller; 36. Oscillating tension roller; 37. Oscillating tension screw; 38. Oscillating tension nut; 39. Oscillating belt conveyor electromagnet; 4. Flying shear roller; 5. Shear blade; 6. Oscillating magnetic frame; 7. Upper belt adjusting roller; 8. Base; 9. Upper suspended belt conveyor; 10. Upper suspended belt conveyor frame; 11. First fixed guide plate; 12. Second fixed guide plate; 13. Waste conveying device; 14. Waste collection hopper; 141. Waste collection device trolley; 15. Lower magnetic belt conveyor; 16. Swing adjusting screw; 161. Swing adjusting nut; 162. Adjusting component; 17. First belt; 18. Mounting component; 181. Belt roller adjusting screw; 182. Belt roller adjusting nut; 19. First electromagnet; 20. Adjusting belt roller. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the embodiments, by Figure 1-5 This invention discloses a pre-shearing suspended magnetic belt conveyor device, comprising a base 8 and a waste conveying device 13. A cutting head flying shear frame 1 is fixedly connected to the top of the base 8. A flying shear roller 4 is rotatably connected inside the cutting head flying shear frame 1. A shear blade 5 is assembled inside the flying shear roller 4. The shear blade 5 is inserted into the flying shear roller 4 and installed by bolts. One end of the shear blade 5 protrudes from the surface of the flying shear roller 4. An inlet guide plate 2 is assembled inside the cutting head flying shear frame 1. A first motor is fixedly installed on the back of the cutting head flying shear frame 1. The output shaft of the first motor is fixedly connected to the flying shear roller 4. There are two flying shear rollers 4.

[0029] In this embodiment, in actual use, gears are provided on the roller shafts of both flying shear rollers 4. The two gears mesh with each other. The first motor causes the two flying shear rollers 4 to rotate, so that the two shear blades 5 come closer to each other to cut the steel strip, thereby achieving precise cutting of the material. The inlet guide plate 2 can guide the material into the cutting head flying shear frame 1 to ensure the correct material conveying and cutting position. The first motor provides power to the flying shear rollers 4 to ensure the smooth execution of the cutting action, thereby achieving efficient cutting processing of the material.

[0030] The external of the flying shear frame 1 is fixedly connected to a fixed magnetic belt frame 31. The inner wall of the flying shear frame 1 is rotatably connected to a fixed magnetic belt drive roller 32 via a bearing seat. The internal of the fixed magnetic belt frame 31 is rotatably connected to a swing magnetic frame 6. The internal of the fixed magnetic belt frame 31 is rotatably connected to a first swing passive roller 34. The internal of the swing magnetic frame 6 is rotatably connected to a second swing passive roller 35. The internal of the fixed magnetic belt frame 31 is provided with a first tensioning roller group. The internal of the swing magnetic frame 6 is fixedly installed with a swing belt electromagnet 39. The internal of the fixed magnetic belt frame 31 is rotatably connected to a swing adjusting screw 16. The internal of the swing magnetic frame 6 is rotatably connected to an adjusting component. The swing adjusting screw 16 passes through the adjusting component. The external of the swing adjusting screw 16 is threaded with two swing adjusting nuts 161 distributed at the upper and lower ends of the adjusting component.

[0031] In this embodiment, in actual use, the first swing passive roller 34 is located at the rotation point where the swing magnetic frame 6 and the fixed magnetic belt frame 31 are located. By loosening the two swing adjusting nuts 161, the swing adjusting screw 16 slides in the adjusting part, so that the swing magnetic frame 6 rotates around the center of the first swing passive roller 34. When the swing magnetic frame 6 is horizontal, the two swing adjusting nuts 161 limit and fix the swing adjusting screw 16.

[0032] A first fixed guide plate 11 is fixedly connected to the top of the base 8, and a second fixed guide plate 12 is fixedly connected to the top of the base 8. Both the first fixed guide plate 11 and the second fixed guide plate 12 are inclined. A waste conveying device 13 is provided at the bottom of the base 8, and a track is provided at the top of the base 8. A waste collection device trolley 141 is slidably connected to the surface of the track, and a waste collection hopper 14 is fixedly connected to the top of the waste collection device trolley 141.

[0033] In this embodiment, in actual use, the waste conveying device 13 is located below the first fixed guide plate 11. The waste conveying device 13 is a roller conveyor. When the swing magnetic frame 6 is in an inclined position, the steel strip slides onto the first fixed guide plate 11 and falls into the waste conveying device 13. It is then conveyed to the waste storage area by the roller conveyor. If the waste steel strip is to be inspected, when the swing magnetic frame 6 is in a horizontal position, the steel strip slides onto the second fixed guide plate 12 and falls into the waste collection hopper 14. It is then transported to a safe and convenient pick-up position by the waste collection device trolley 141 for easy inspection.

[0034] The first tensioning roller assembly includes a swing tensioning screw 37 threadedly connected to the inside of the fixed magnetic belt frame 31. A swing tensioning nut 38 is threadedly connected to the outside of the swing tensioning screw 37. Three swing tensioning rollers 36 arranged in a triangular pattern are rotatably connected to the inside of the fixed magnetic belt frame 31 via bearing seats. The bearing seat of a single swing tensioning roller 36 is rotatably connected to the swing tensioning screw 37, while the bearing seats of the other two swing tensioning rollers 36 are fixedly installed inside the fixed magnetic belt frame 31.

[0035] In this embodiment, in actual use, the first tensioning roller group also includes a second motor that provides power. The second motor is mounted on the fixed magnetic belt frame 31. The output shaft of the second motor is fixedly connected to the swing tensioning roller 36, which is fixedly mounted inside the fixed magnetic belt frame 31 via a bearing seat. By loosening the swing tensioning nut 38, the swing tensioning screw 37 can be rotated. The swing tensioning screw 37 drives the swing tensioning roller 36 to move, which can easily adjust the position of the swing tensioning roller 36, thereby achieving precise adjustment of the conveyor belt tension. This ensures that the conveyor belt maintains a suitable tension during operation, avoids conveyor belt slippage or slack, and improves the stability and reliability of the conveyor.

[0036] The fixed magnetic belt conveyor's drive roller 32, first oscillating passive roller 34, second oscillating passive roller 35, and first tension roller group are all externally connected to a fixed belt 33. The fixed belt 33 connects the rollers to realize the transmission of power and the drive of the conveyor belt, enabling the conveyor belt to run stably and ensuring the continuity and stability of the material during the conveying process. At the same time, it is convenient to adjust the tension of the conveyor belt to ensure the normal operation of the conveyor belt.

[0037] A suspended belt conveyor 9 is installed on the top of the base 8. The suspended belt conveyor 9 includes a suspended belt conveyor frame 10 fixedly connected to the top of the base 8. A second tensioning roller group is installed inside the suspended belt conveyor frame 10. An installation component 18 is fixedly connected inside the suspended belt conveyor frame 10. A belt roller adjusting screw 181 is laterally slidably connected inside the installation component 18. The belt roller adjusting screw 181 is slidably connected to the installation component 18 through a fixedly connected limiting sleeve, so that the belt roller adjusting screw 181 cannot rotate. Two belt roller adjusting nuts 182 are threadedly connected to the external of the belt roller adjusting screw 181 and distributed at the left and right ends of the installation component 18. An upper belt adjusting roller 7 is rotatably connected to the belt roller adjusting screw 181 through a bearing seat. An adjusting belt roller 20 is fixedly connected to the external of the upper belt adjusting roller 7.

[0038] In this embodiment, in actual use, the belt roller adjusting screw 181 is fixedly connected to the bearing seat of the upper belt adjusting roller 7. Through the cooperation of the belt roller adjusting screw 181 and the belt roller adjusting nut 182, the position of the upper belt adjusting roller 7 can be easily adjusted to ensure the accurate running direction of the conveyor belt and improve the stability and reliability of the conveying.

[0039] There are two adjusting belt rollers 20, which are distributed at both ends of the upper suspended belt conveyor frame 10. The first electromagnet 19 is fixedly installed inside the upper suspended belt conveyor frame 10. The two adjusting belt rollers 20 and the second tension roller group are all connected to the outside of the first belt 17.

[0040] The first electromagnet 19 can attract the steel belt to the first belt 17, thereby achieving stable conveying of the steel belt.

[0041] The structure of the second tensioning roller group is the same as that of the first tensioning roller group, except that the installation position is different. For the specific structure and working principle, please refer to the detailed description of the first tensioning roller group, so we will not go into too much detail.

[0042] A lower magnetic belt conveyor 15 is installed on the top of the base 8. The structure of the lower magnetic belt conveyor 15 is the same as that of the upper suspended belt conveyor 9, but its installation position is different. The lower magnetic belt conveyor 15 is installed on the top of the base 8 and is mainly used to convey the sheared material.

[0043] Working principle:

[0044] First: The inlet guide plate 2 guides the steel strip head into the cutting head flying shear frame 1. The first motor provides power to the flying shear roller 4. When the two flying shear rollers 4 rotate, the two shear blades 5 move closer to each other to cut the steel strip head. At this time, the first electromagnet 19 inside the upper suspended belt conveyor 9 is de-energized, the swing belt conveyor electromagnet 39 is energized and runs, and the swing magnetic frame 6 is in an inclined position. The waste strip head slides onto the first fixed guide plate 11 and falls into the waste conveying device 13. It is then transported to the waste storage area by the roller conveyor. If the waste steel strip needs to be inspected, the swing adjusting screw 16 and the swing adjusting nut 161 need to be adjusted to make the swing magnetic frame 6 swing horizontally. The steel strip slides onto the second fixed guide plate 12 and falls into the waste collection hopper 14. It is then transported to a safe and convenient pick-up position by the waste collection device trolley 141 for easy inspection.

[0045] After shearing is completed, the electromagnet 39 of the swing belt conveyor on the swing magnetic frame 6 is de-energized, and the first electromagnet 19 inside the upper suspended belt conveyor 9 is energized and runs, attracting the strip steel to be used as the finished product onto the first belt 17. Then, the strip steel is attracted by the lower magnetic belt conveyor 15 and continues to be transported to the steering pinch roller until the coiler finishes winding and then circulates.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pre-shearing overhang magnetic belt conveyor device comprising a base (8) and a waste conveyor device (13), characterized in that: A head-cutting flying shear frame (1) is fixedly connected to the top of the base (8). A fixed magnetic belt frame (31) is fixedly connected to the outside of the head-cutting flying shear frame (1). A fixed magnetic belt drive roller (32) is rotatably connected to the inner wall of the head-cutting flying shear frame (1). A swing magnetic frame (6) is rotatably connected inside the fixed magnetic belt frame (31). A first swing passive roller (34) is rotatably connected inside the fixed magnetic belt frame (31). A second swing passive roller (35) is rotatably connected inside the swing magnetic frame (6). A first tensioning roller group is provided inside the fixed magnetic belt frame (31). A swing belt electromagnet (39) is fixedly installed inside the swing magnetic frame (6). A swing adjustment screw (16) is rotatably connected inside the fixed magnetic belt frame (31). The frame (6) is internally rotatably connected to an adjusting component. The swing adjusting screw (16) passes through the adjusting component. The swing adjusting screw (16) is externally threaded with two swing adjusting nuts (161) distributed at the upper and lower ends of the adjusting component. The top of the base (8) is provided with an upper suspended belt conveyor (9). The top of the base (8) is provided with a lower magnetic belt conveyor (15). The top of the base (8) is fixedly connected with a first fixed guide plate (11). The top of the base (8) is fixedly connected with a second fixed guide plate (12). The waste conveying device (13) is located at the bottom of the base (8). The top of the base (8) is provided with a track. The surface of the track is slidably connected with a waste collection device trolley (141). The top of the waste collection device trolley (141) is fixedly connected with a waste collection hopper (14).

2. A magnetic belt conveyor with overhang before cutting according to claim 1, characterized in that: The first tensioning roller group includes a swing tensioning screw (37) threadedly connected to the inside of the fixed magnetic belt frame (31). The swing tensioning screw (37) is externally threaded with a swing tensioning nut (38). The inside of the fixed magnetic belt frame (31) is rotatably connected to three swing tensioning rollers (36) arranged in a triangular pattern via bearing seats. The bearing seats of the swing tensioning rollers (36) are rotatably connected to the swing tensioning screw (37). The bearing seats of the other two swing tensioning rollers (36) are fixedly arranged inside the fixed magnetic belt frame (31).

3. A magnetic belt conveyor with overhang before cutting according to claim 1, characterized in that: The flying shear frame (1) is rotatably connected to a flying shear roller (4), and a shear blade (5) is assembled inside the flying shear roller (4). An inlet guide plate (2) is assembled inside the flying shear frame (1). A first motor is fixedly installed on the back of the flying shear frame (1), and the output shaft of the first motor is fixedly connected to the flying shear roller (4). There are two flying shear rollers (4).

4. A magnetic belt conveyor with overhang before cutting according to claim 1, characterized in that: The fixed magnetic belt drive roller (32), the first oscillating passive roller (34), the second oscillating passive roller (35) and the first tension roller group are all externally connected to a fixed belt (33).

5. A magnetic belt conveyor with overhang before cutting according to claim 1, characterized in that: The upper suspended belt conveyor (9) includes an upper suspended belt conveyor frame (10) fixedly connected to the top of the base (8). The upper suspended belt conveyor frame (10) is provided with a second tensioning roller group inside. An installation part (18) is fixedly connected inside the upper suspended belt conveyor frame (10). A belt roller adjusting screw (181) is laterally slidably connected inside the installation part (18). Two belt roller adjusting nuts (182) are threadedly connected to the external of the belt roller adjusting screw (181) and distributed at the left and right ends of the installation part (18). The belt roller adjusting screw (181) is rotatably connected to an upper belt adjusting roller (7) through a bearing seat. An adjusting belt roller (20) is fixedly connected to the external of the upper belt adjusting roller (7).

6. A magnetic belt conveyor with overhang before the cut according to claim 5, characterized in that: The number of the adjusting belt rollers (20) is two. The two adjusting belt rollers (20) are distributed at both ends of the upper suspended belt conveyor frame (10). The first electromagnet (19) is fixedly installed inside the upper suspended belt conveyor frame (10). The two adjusting belt rollers (20) and the second tension roller group are all connected by a first belt (17) for transmission.

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