Large cutting and roll-dividing machine

Abstract

The utility model discloses a large-scale cutting roll-dividing machine, which relates to the technical field of roll-dividing machines and comprises an unwinding structure, a front driving component is arranged on one side of the unwinding structure, a plurality of auxiliary rollers are arranged on one side, far away from the unwinding structure, of the front driving component, and a flattening component is arranged between the front driving component and the auxiliary rollers; a rear driving assembly is arranged on the side, away from the flattening assembly, of the auxiliary roller, and a cutting assembly is arranged between the rear driving assembly and the auxiliary roller. A winding structure is arranged on the side, away from the cutting assembly, of the rear driving assembly. The connection between the connecting sleeve and the connecting column can be loosened by loosening the fixing bolt, the connecting sleeve moves along the connecting column, the distance between the multiple cutters is changed, and the multiple cutters can cut materials into materials with different widths according to working requirements. The third air cylinder can drive the rotating plate to rotate with the connecting sleeve as the circle center through the connecting rod and the connecting block by controlling the bottom plate to move, so that the height of the cutter is changed, and the cutter can cut materials with different thicknesses.

Description

Technical Field

[0001] This utility model relates to the field of slitting machine technology, specifically a large-scale cutting and slitting machine. Background Technology

[0002] A slitting machine is a device used to slit and wind rolls of material. The unwinding mechanism unfolds the original roll, the slitting mechanism cuts the roll according to preset dimensions or requirements, and the winding mechanism winds the slit material into the required small rolls.

[0003] Chinese Patent Publication No. CN 208070960 U discloses a cutting and slitting device for flame-retardant tape, including an unwinding component, a transition table, a slitting component, a cutting component, and a take-up air shaft. The transition table is located downstream of the unwinding component and is inclined. The take-up air shaft is located at the downward inclined end of the transition table. A first gantry is mounted across the top of this end of the transition table, and a second gantry that can slide towards the first gantry is mounted across the other end. The cutting component and the slitting component are respectively slidably located in the openings of the first gantry and the second gantry, and the sliding direction of both is perpendicular to the plane of the top of the transition table. A pressing component is provided on the side of the slitting component, and a finishing component is provided on the side of the cutting component.

[0004] The aforementioned cutting and slitting device uses multiple evenly distributed blades to cut the material, dividing the entire material into multiple portions. However, the spacing and height of the multiple blades in the aforementioned cutting and slitting device cannot be adjusted, so the width of the cut material cannot be changed, nor can it cut materials of different thicknesses. Utility Model Content

[0005] The purpose of this invention is to provide a large-scale cutting and slitting machine that allows the connecting sleeve to move along the connecting column by loosening the fixing bolts, thereby changing the spacing between multiple cutters; and that the rotating plate can be controlled by a cylinder to change the height of the cutters, thus solving the technical problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A large-scale cutting and slitting machine includes an unwinding structure, a front drive assembly on one side of the unwinding structure, a plurality of auxiliary rollers on the side of the front drive assembly away from the unwinding structure, and a flattening assembly between the front drive assembly and the auxiliary rollers; a rear drive assembly on the side of the auxiliary rollers away from the flattening assembly, and a cutting assembly between the rear drive assembly and the auxiliary rollers; and a winding structure on the side of the rear drive assembly away from the cutting assembly; both the unwinding structure and the winding structure are fixedly connected to a support frame.

[0008] The cutting assembly includes multiple cutting blade structures, each including a rotating plate. A cutting blade is fixedly connected to one side of the rotating plate, and the other end is rotatably connected to the outside of the connecting sleeve.

[0009] The flattening assembly includes a lead screw, both ends of which are threadedly connected to pressure plate structures. A connecting frame is provided between the two pressure plate structures, and one end of the connecting frame is symmetrically rotatably connected to two pressure rollers.

[0010] The pressure plate structure includes a pressure plate, one side of which is fixedly connected to a connecting plate; a threaded cylinder is sleeved in the middle of the connecting plate, and the inner side of the threaded cylinder is threadedly connected to the lead screw.

[0011] As a further technical solution of this utility model, the multiple cutting blade structures are all fixedly connected to the connecting column, and both ends of the connecting column are fixedly connected to the bracket; a pad is provided below the connecting column, and the multiple cutting blade structures are located above the pad; both ends of the pad are fixedly connected to the bracket.

[0012] As a further technical solution of this utility model, the connecting sleeve is coaxially fixedly connected to the connecting column by fixing bolts; a support plate is fixedly connected to the outside of the connecting sleeve, the upper end of the support plate is rotatably connected to the top of the cylinder three, the telescopic rod of the cylinder three is fixedly connected to the base plate, and one side of the base plate is fixedly connected to the connecting rod; the end of the connecting rod away from the base plate is fixedly connected to the connecting block, and one side of the connecting block is fixedly connected to the side of the rotating plate away from the cutter.

[0013] As a further technical solution of this utility model, the end of the connecting frame away from the pressure roller is rotatably connected to the second support seat, the bottom of the second support seat is fixedly connected to the middle of the top of the horizontal column; the middle side of the horizontal column is fixedly connected to the first support seat, which is rotatably connected to the middle section of the lead screw; both ends of the lead screw are coaxially fixedly connected to a rotating handwheel; both ends of the horizontal column are fixedly connected to the bracket.

[0014] As a further technical solution of this utility model, one side of the connecting plate is fixedly connected to the first connecting plate, and the first connecting plate is fixedly connected to the middle of the slider; the side of the slider away from the first connecting plate is slidably connected to the horizontal column.

[0015] As a further technical solution of this utility model, the front drive assembly includes an adjustment roller, a drive roller is provided below the adjustment roller, and there is a space between the drive roller and the adjustment roller for material to pass through; the two ends of the drive roller are respectively rotatably connected to two side plates through bearing seats, and both side plates are fixedly connected to the bracket.

[0016] As a further technical solution of this utility model, one end of the drive roller is fixedly connected to the input end of the reducer, and the output end of the reducer is fixedly connected to the output shaft of the motor; both the reducer and the motor are fixedly connected to the bracket; both ends of the adjusting roller are rotatably connected to sliding seats, and the two sliding seats are slidably connected to the two side plates respectively; the tops of the two sliding seats are fixedly connected to the telescopic rods of the two cylinders, and the two cylinders are fixedly connected to the tops of the two side plates respectively.

[0017] As a further technical solution of this utility model, the rear drive assembly includes an adjusting roller 2, a driving roller 2 below the adjusting roller 2, and a driving roller 3 below the driving roller 2; the two ends of the adjusting roller 2 are rotatably connected to two sliding seats 2 respectively, and the two sliding seats 2 are slidably connected to two side plates 2 respectively; the tops of the two sliding seats 2 are fixedly connected to the telescopic rods of two cylinders 2 respectively, and the two cylinders 2 are fixedly connected to the tops of the two side plates 2 respectively; both side plates 2 are fixedly connected to the bracket.

[0018] As a further technical solution of this utility model, the two ends of the drive roller 2 and drive roller 3 are rotatably connected to the two side plates 2 through bearing seats respectively; one end of the drive roller 2 and drive roller 3 is coaxially fixedly connected to a driven synchronous wheel, and a redirecting synchronous wheel is provided below the drive roller 3, which is rotatably connected to the bracket; an active synchronous wheel is provided on one side of the driven synchronous wheel.

[0019] As a further technical solution of this utility model, the active synchronous pulley is coaxially and fixedly connected to the output shaft of the motor, and the motor is fixedly connected to the bracket; the active synchronous pulley, the two driven synchronous pulleys and the redirecting synchronous pulley are all connected to the synchronous belt drive, wherein the active synchronous pulley, the redirecting synchronous pulley and the driven synchronous pulley fixedly connected to the second drive roller are located at the inner corner of the synchronous belt, and the driven synchronous pulley fixedly connected to the third drive roller is located at the outer corner of the synchronous belt.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. This utility model allows the connection between the connecting sleeve and the connecting column to be loosened by loosening the fixing bolts, thereby allowing the connecting sleeve to move along the connecting column and changing the spacing between multiple cutters. This enables the multiple cutters to cut materials into different widths according to work requirements. In addition, the cylinder three controls the movement of the base plate, which in turn drives the rotating plate to rotate around the connecting sleeve using the connecting rod and connecting block. This changes the height of the cutters, allowing them to cut materials of different thicknesses.

[0022] 2. In this utility model, rotating the handwheel can drive the lead screw to rotate, thereby causing the two threaded cylinders to move the pressure plate laterally, thus changing the distance between the two pressure plates. This allows the two pressure plates to press materials of different widths, preventing the materials from folding during movement. The slider can improve the stability of the pressure plate movement and prevent the pressure plate from shaking. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0024] Figure 2 This utility model Figure 1 Another perspective view.

[0025] Figure 3 This is a three-dimensional structural diagram of the flattening component of this utility model.

[0026] Figure 4 This is a three-dimensional structural diagram of the cutting component of this utility model.

[0027] Figure 5 This is a three-dimensional structural diagram of the cutting blade structure of this utility model.

[0028] Figure 6 This utility model Figure 5 Side view.

[0029] Figure 7 This utility model Figure 3 A magnified view of a portion of the image.

[0030] Figure 8 This is a three-dimensional structural diagram of the front-drive component of this utility model.

[0031] Figure 9 This is a three-dimensional structural diagram of the rear drive component of this utility model.

[0032] In the diagram: 1-unwinding structure, 2-front drive assembly, 3-flattening assembly, 4-auxiliary roller, 5-cutting assembly, 6-rear drive assembly, 7-winding structure, 8-support;

[0033] 21-Adjusting roller 1, 22-Drive roller 1, 23-Cylinder 1, 24-Sliding seat 1, 25-Side plate 1, 26-Motor 1, 27-Reducer 1, 31-Screw, 32-Rotating handwheel, 33-Pressure plate structure, 34-Horizontal column, 35-Support seat 1, 36-Support seat 2, 37-Connecting frame, 38-Pressure roller, 51-Connecting column, 52-Pad plate, 53-Cutter structure, 61-Adjusting roller 2, 62-Drive roller 2, 63-Drive roller 3, 64-Side plate 2, 65-Cylinder 2, 66-Sliding seat 2, 67-Motor, 68-Active synchronous pulley, 69-Driven synchronous pulley, 60-Redirecting synchronous pulley;

[0034] 331-Slider, 332-Connecting plate one, 333-Connecting plate, 334-Threaded cylinder, 335-Pressure plate, 531-Support plate, 532-Connecting sleeve, 533-Cylinder three, 534-Base plate, 535-Connecting rod, 536-Connecting block, 537-Rotating plate, 538-Cutter, 539-Fixing bolt. Detailed Implementation

[0035] 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.

[0036] Please see Figure 1-9 In this embodiment of the present invention, a large cutting and slitting machine includes an unwinding structure 1, a front drive assembly 2 on one side of the unwinding structure 1, a plurality of auxiliary rollers 4 on the side of the front drive assembly 2 away from the unwinding structure 1, and a flattening assembly 3 between the front drive assembly 2 and the auxiliary rollers 4; a rear drive assembly 6 on the side of the auxiliary rollers 4 away from the flattening assembly 3, and a cutting assembly 5 between the rear drive assembly 6 and the auxiliary rollers 4; a winding structure 7 on the side of the rear drive assembly 6 away from the cutting assembly 5; both the unwinding structure 1 and the winding structure 7 are fixedly connected to a bracket 8.

[0037] The cutting assembly 5 includes multiple cutting blade structures 53, each cutting blade structure 53 including a rotating plate 537, with a cutting blade 538 fixedly connected to one side of the rotating plate 537 and the other end rotatably connected to the outside of the connecting sleeve 532.

[0038] The flattening assembly 3 includes a lead screw 31, both ends of which are threadedly connected to a pressure plate structure 33. A connecting frame 37 is provided between the two pressure plate structures 33, and two pressure rollers 38 are symmetrically rotatably connected to one end of the connecting frame 37.

[0039] The pressure plate structure 33 includes a pressure plate 335, one side of which is fixedly connected to a connecting plate 333; a threaded cylinder 334 is sleeved in the middle of the connecting plate 333, and the inner side of the threaded cylinder 334 is threadedly connected to the lead screw 31.

[0040] Multiple cutting blade structures 53 are fixedly connected to connecting posts 51, and both ends of the connecting posts 51 are fixedly connected to brackets 8; a pad 52 is provided below the connecting posts 51, and multiple cutting blade structures 53 are located above the pad 52; both ends of the pad 52 are fixedly connected to brackets 8.

[0041] The connecting sleeve 532 is coaxially fixedly connected to the connecting column 51 by fixing bolts 539; a support plate 531 is fixedly connected to the outside of the connecting sleeve 532, the upper end of the support plate 531 is rotatably connected to the top of the cylinder 3 533, the telescopic rod of the cylinder 3 533 is fixedly connected to the base plate 534, and one side of the base plate 534 is fixedly connected to the connecting rod 535; the end of the connecting rod 535 away from the base plate 534 is fixedly connected to the connecting block 536, and one side of the connecting block 536 is fixedly connected to the side of the rotating plate 537 away from the cutter 538.

[0042] The end of the connecting frame 37 away from the pressure roller 38 is rotatably connected to the second support base 36. The bottom of the second support base 36 is fixedly connected to the middle of the top of the horizontal column 34. A first support base 35 is fixedly connected to the middle side of the horizontal column 34. The first support base 35 is rotatably connected to the middle section of the lead screw 31. Both ends of the lead screw 31 are coaxially fixedly connected to a rotating handwheel 32. Both ends of the horizontal column 34 are fixedly connected to the bracket 8.

[0043] One side of the connecting plate 333 is fixedly connected to the connecting plate 332, and the connecting plate 332 is fixedly connected to the middle of the slider 331; the side of the slider 331 away from the connecting plate 332 is slidably connected to the horizontal column 34.

[0044] By adopting the above technical solution, the connection between the connecting sleeve 532 and the connecting post 51 can be loosened by loosening the fixing bolt 539, thereby allowing the connecting sleeve 532 to move along the connecting post 51, thus changing the spacing between the multiple cutters 538, so that the multiple cutters 538 can cut the material into different widths according to the work requirements; in addition, the cylinder 533 can control the movement of the base plate 534 by using the connecting rod 535 and the connecting block 536 to drive the rotating plate 537 to rotate around the connecting sleeve 532, thereby changing the height of the cutter 538, so that the cutter 538 can cut materials of different thicknesses.

[0045] In this embodiment, the front drive assembly 2 includes an adjustment roller 21, and a drive roller 22 is provided below the adjustment roller 21. The space between the drive roller 22 and the adjustment roller 21 is for material to pass through. The two ends of the drive roller 22 are rotatably connected to two side plates 25 through bearing seats, and both side plates 25 are fixedly connected to the bracket 8.

[0046] One end of the drive roller 22 is fixedly connected to the input end of the reducer 27, and the output end of the reducer 27 is fixedly connected to the output shaft of the motor 26; both the reducer 27 and the motor 26 are fixedly connected to the bracket 8; both ends of the adjusting roller 21 are rotatably connected to sliding seats 24, and the two sliding seats 24 are slidably connected to the two side plates 25 respectively; the tops of the two sliding seats 24 are fixedly connected to the telescopic rods of the two cylinders 23 respectively, and the two cylinders 23 are fixedly connected to the tops of the two side plates 25 respectively.

[0047] The rear drive assembly 6 includes an adjusting roller 61, a drive roller 62 below the adjusting roller 61, and a drive roller 63 below the drive roller 62. Both ends of the adjusting roller 61 are rotatably connected to two sliding seats 66, which are slidably connected to two side plates 64. The tops of the two sliding seats 66 are fixedly connected to the telescopic rods of two cylinders 65, which are fixedly connected to the tops of the two side plates 64. Both side plates 64 are fixedly connected to the bracket 8.

[0048] The two ends of the second drive roller 62 and the third drive roller 63 are rotatably connected to the two side plates 64 via bearing seats; one end of the second drive roller 62 and the third drive roller 63 are coaxially fixedly connected to a driven synchronous wheel 69; a redirecting synchronous wheel 60 is provided below the third drive roller 63, and the redirecting synchronous wheel 60 is rotatably connected to the bracket 8; a driving synchronous wheel 68 is provided on one side of the driven synchronous wheel 69;

[0049] The active synchronous pulley 68 is coaxially and fixedly connected to the output shaft of the motor 67, which is fixedly connected to the bracket 8. The active synchronous pulley 68, the two driven synchronous pulleys 69, and the redirecting synchronous pulley 60 are all connected to the synchronous belt drive. The active synchronous pulley 68, the redirecting synchronous pulley 60, and the driven synchronous pulley 69 fixedly connected to the second drive roller 62 are located at the inner corner of the synchronous belt, while the driven synchronous pulley 69 fixedly connected to the third drive roller 63 is located at the outer corner of the synchronous belt.

[0050] By adopting the above technical solution, rotating the handwheel 32 can drive the lead screw 31 to rotate, thereby causing the two threaded cylinders 334 to drive the pressure plate 335 to move laterally, thus changing the distance between the two pressure plates 335, so that the two pressure plates 335 can press materials of different widths and prevent the materials from folding during the movement; the slider 331 can improve the stability of the pressure plate 335 when it moves and prevent the pressure plate 335 from shaking.

[0051] The working principle of this utility model is as follows: by loosening the fixing bolt 539, the connection between the connecting sleeve 532 and the connecting post 51 can be loosened, thereby allowing the connecting sleeve 532 to move along the connecting post 51, thus changing the spacing between the multiple cutters 538, so that the multiple cutters 538 can cut the material into different widths according to the work requirements; in addition, the cylinder 533 controls the movement of the base plate 534, and can use the connecting rod 535 and the connecting block 536 to drive the rotating plate 537 to rotate around the connecting sleeve 532, thereby changing the height of the cutter 538, so that the cutter 538 can cut materials of different thicknesses;

[0052] When the rotating handwheel 32 is turned, the lead screw 31 can be rotated, which causes the two threaded cylinders 334 to move the pressure plate 335 laterally, thereby changing the distance between the two pressure plates 335. This allows the two pressure plates 335 to press materials of different widths, preventing the materials from folding during movement. The slider 331 can improve the stability of the pressure plate 335 when it moves, preventing the pressure plate 335 from shaking.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A large scale cutting unwinder characterized by: Including the unwinding structure (1), one side of the unwinding structure (1) is equipped with the front drive assembly (2), the front drive assembly (2) is equipped with multiple auxiliary rollers (4) away from one side of the unwinding structure (1), and the front drive assembly (2) is equipped with the flattening assembly (3) between the auxiliary roller (4); The side away from the flattening assembly (3) of the auxiliary roller (4) is equipped with the rear drive assembly (6), and the cutting assembly (5) is arranged between the rear drive assembly (6) and the auxiliary roller (4); The side away from the cutting assembly (5) of the rear drive assembly (6) is equipped with the winding structure (7); The unwinding structure (1) and the winding structure (7) are fixedly connected with the support (8); The cutting assembly (5) includes multiple cutter structures (53), the cutter structure (53) includes a rotating plate (537), one end of the rotating plate (537) is fixedly connected with a cutter (538), and the other end is rotatably connected with the outer side of a connecting sleeve (532); The flattening assembly (3) includes a lead screw (31), both ends of the lead screw (31) are threadedly connected with a pressing plate structure (33), a connecting frame (37) is arranged between the two pressing plate structures (33), and the connecting frame (37) is symmetrically rotatably connected with two pressing wheels (38) at one end; The pressing plate structure (33) includes a pressing plate (335), and one side of the pressing plate (335) is fixedly connected with a connecting plate (333); A threaded cylinder (334) is sleeved in the connecting plate (333), and the inner side of the threaded cylinder (334) is threadedly connected with the lead screw (31).

2. The large cutting unwinder according to claim 1, characterized in that: Multiple cutter structures (53) are fixedly connected with a connecting column (51), both ends of the connecting column (51) are fixedly connected with the support (8); A backing plate (52) is arranged below the connecting column (51), and multiple cutter structures (53) are arranged above the backing plate (52); Both ends of the backing plate (52) are fixedly connected with the support (8).

3. The large cutting unwinder according to claim 2, characterized in that: The connecting sleeve (532) is coaxially fixedly connected with the connecting column (51) through a fixing bolt (539); The outer side of the connecting sleeve (532) is fixedly connected with a supporting plate (531), the upper end of the supporting plate (531) is rotatably connected with the top of a third air cylinder (533), the extension rod of the third air cylinder (533) is fixedly connected with a bottom plate (534), one side of the bottom plate (534) is fixedly connected with a connecting rod (535); One end of the connecting rod (535) away from the bottom plate (534) is fixedly connected with a connecting block (536), one side of the connecting block (536) is fixedly connected with one side of the rotating plate (537) away from the cutter (538).

4. The large cutting unwinder according to claim 1, characterized in that: One end of the connecting frame (37) away from the pressing wheel (38) is rotatably connected with a supporting seat two (36), and the bottom of the supporting seat two (36) is fixedly connected with the top of a cross column (34) in the middle; A supporting seat one (35) is fixedly connected with one side of the middle of the cross column (34), and the supporting seat one (35) is rotatably connected with the middle section of the lead screw (31); Both ends of the lead screw (31) are coaxially fixedly connected with a rotating hand wheel (32); Both ends of the cross column (34) are fixedly connected with the support (8).

5. The large cutting unwinder according to claim 4, characterized in that: One side of the connecting plate (333) is fixedly connected with a connecting plate one (332), the connecting plate one (332) is fixedly connected with the middle of the sliding block (331); the side of the sliding block (331) away from the connecting plate one (332) is slidably connected with the horizontal column (34).

6. The large cutting unwinder according to claim 1, characterized in that: The front drive assembly (2) comprises an adjusting roller one (21), a drive roller one (22) is arranged below the adjusting roller one (21), and a space for material passing through is formed between the drive roller one (22) and the adjusting roller one (21); the two ends of the drive roller one (22) are rotatably connected with two side plates one (25) through bearing seats, and the two side plates one (25) are fixedly connected with the support (8).

7. The large cutting unwinder according to claim 6, characterized in that: One end of the drive roller one (22) is fixedly connected with the input end of a speed reducer one (27), the output end of the speed reducer one (27) is fixedly connected with the output shaft of a motor one (26), and the speed reducer one (27) and the motor one (26) are fixedly connected with the support (8); the two ends of the adjusting roller one (21) are rotatably connected with sliding seats one (24), and the two sliding seats one (24) are slidably connected with the two side plates one (25); the top portions of the two sliding seats one (24) are fixedly connected with the telescopic rods of two air cylinders one (23), and the two air cylinders one (23) are fixedly connected with the top portions of the two side plates one (25).

8. The large cutting unwinder according to claim 1, characterized in that: The rear drive assembly (6) comprises an adjusting roller two (61), a drive roller two (62) is arranged below the adjusting roller two (61), and a drive roller three (63) is arranged below the drive roller two (62); the two ends of the adjusting roller two (61) are rotatably connected with two sliding seats two (66), and the two sliding seats two (66) are slidably connected with two side plates two (64); the top portions of the two sliding seats two (66) are fixedly connected with the telescopic rods of two air cylinders two (65), and the two air cylinders two (65) are fixedly connected with the top portions of the two side plates two (64); and the two side plates two (64) are fixedly connected with the support (8).

9. The large cutting unwinder according to claim 8, characterized in that: The two ends of the drive roller two (62) and the drive roller three (63) are rotatably connected with the two side plates two (64) through bearing seats; one end of the drive roller two (62) and the drive roller three (63) is coaxially fixedly connected with a driven synchronous wheel (69), a reversing synchronous wheel (60) is arranged below the drive roller three (63), and the reversing synchronous wheel (60) is rotatably connected with the support (8); one side of the driven synchronous wheel (69) is provided with a driving synchronous wheel (68).

10. The large cutting unwinder according to claim 9, characterized in that: The driving synchronous wheel (68) is coaxially fixedly connected with the output shaft of a motor (67), and the motor (67) is fixedly connected with the support (8); the driving synchronous wheel (68), the two driven synchronous wheels (69) and the reversing synchronous wheel (60) are all drivingly connected with a synchronous belt, wherein the driving synchronous wheel (68), the reversing synchronous wheel (60) and the driven synchronous wheel (69) fixedly connected with the drive roller two (62) are located at the inner side corner of the synchronous belt, and the driven synchronous wheel (69) fixedly connected with the drive roller three (63) is located at the outer side corner of the synchronous belt.

Images