A nonwoven fabric needle punching device

Abstract

A nonwoven fabric needle punching device is provided to solve the technical problem mentioned in the background art of existing nonwoven fabric processing equipment where, after the nonwoven fabric on the take-up roller is wound up, the operator needs to stop the machine and remove the nonwoven fabric from the take-up roller before the nonwoven fabric can be processed again. The device includes a worktable and a mounting plate fixed above the worktable. A needle punching assembly for needle punching the nonwoven fabric is provided between the worktable and the mounting plate. A drive assembly for driving the needle punching assembly to move vertically is provided on the mounting plate. A fixed frame is fixed on a guide rail, and a sliding frame is slidably provided inside the guide rail. Several rotating rollers are rotatably mounted on the fixed frame and the sliding frame. A first support frame and a second support frame are fixed on the side of the guide rail away from the worktable. A rotating frame is rotatably mounted on the first support frame, and material rods are fixed at both ends of the rotating frame. A cutting blade for cutting the nonwoven fabric is provided on the second support frame, and a take-up assembly for winding the nonwoven fabric is provided on the second support frame.

Description

Technical Field

[0001] This utility model relates to the field of nonwoven fabric processing technology, specifically to a nonwoven fabric needle punching device. Background Technology

[0002] Non-woven fabric, also known as non-woven cloth, is composed of oriented or randomly arranged fibers. It is called cloth because it resembles the appearance and some properties of fabric. Non-woven fabrics are characterized by moisture resistance, breathability, flexibility, light weight, non-flammability, easy decomposition, non-toxicity, non-irritation, rich colors, low price, and recyclability. They are often produced using polypropylene granules as raw material through a continuous one-step process of high-temperature melting, spinning, laying, and hot-pressing.

[0003] A prior art nonwoven fabric processing device, such as the utility model patent document with authorization announcement number "CN222574960U" and patent name "A Processing Device for Multilayer Nonwoven Fabric of Fiber Balls", discloses a nonwoven fabric processing device including a feeding mechanism, a needle punching mechanism, and a traction mechanism. The feeding mechanism includes an upper roller and a lower roller for guiding the direction of the nonwoven fabric. A feeding machine for conveying fiber balls is provided on one side of the upper roller and the lower roller. The needle punching mechanism includes a frame, a needle plate, a plurality of needles arranged in an array on the needle plate, a cylinder for driving the needle plate to move, and a mesh plate for receiving the nonwoven fabric. The needle holes on the mesh plate correspond to the needles. The traction mechanism includes a conveyor, and the mesh plate is arranged at the end of the conveyor.

[0004] The aforementioned patent document describes the use of a winding roller to wind up the processed nonwoven fabric. However, once the nonwoven fabric on the winding roller is wound up, the operator needs to stop the machine and remove the nonwoven fabric from the winding roller before the nonwoven fabric can be processed again, thus reducing production efficiency. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a nonwoven fabric needle punching device. This device solves the technical problem mentioned in the background art where existing nonwoven fabric processing equipment uses a winding roller to wind up the processed nonwoven fabric. However, once the nonwoven fabric on the winding roller is wound up, the operator needs to stop the machine and remove the nonwoven fabric from the winding roller before the nonwoven fabric can be processed again, thus reducing production efficiency.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A nonwoven fabric needle punching device includes a worktable and a mounting plate fixed above the worktable. A needle punching assembly for needle punching nonwoven fabric is provided between the worktable and the mounting plate. Two guide rods are fixed above the needle punching assembly, and both guide rods slide through the mounting plate. A drive assembly for driving the two guide rods to move vertically is provided on the mounting plate. A guide rail is fixed on one side of the worktable, and a fixed frame is fixed on the guide rail. A sliding frame is slidably provided inside the guide rail. A plurality of rotating rollers are rotatably provided on the fixed frame and the sliding frame. The nonwoven fabric after needle punching by the needle punching assembly is sequentially wound around the plurality of rotating rollers on the fixed frame and the sliding frame. A first support frame and a second support frame are fixed on the side of the guide rail away from the worktable. A rotating frame is rotatably provided on the first support frame, and material rods are fixed at both ends of the rotating frame. A cutting blade for cutting nonwoven fabric is provided on the second support frame, and a winding assembly for clamping the nonwoven fabric on one of the material rods and winding up the nonwoven fabric is provided on the second support frame.

[0008] Working principle:

[0009] The nonwoven fabric is processed by the needle punching assembly between the worktable and the mounting plate. The drive assembly drives two guide rods to move vertically, which in turn drives the needle punching assembly to move up and down to complete the needle punching action. The needle punched nonwoven fabric is wound around the rotating rollers of the fixed frame and the sliding frame on the guide rail. The sliding frame slides along the guide rail to adjust the tension of the nonwoven fabric. The nonwoven fabric is guided to the far end of the guide rail by the rotating rollers. Two material rods are pre-installed on the rotating frame of the first support frame. One material rod is in the waiting position for winding. When one material rod is fully wound, the rotating frame is rotated. The rotating frame rotates the wound material rod to the side away from the fixed frame. Then the winding assembly moves and clamps the end of the nonwoven fabric of the other empty material rod. Then the cutting blade on the second support frame cuts the nonwoven fabric. The winding assembly drives the new material rod to rotate and wind up. Finally, the operator can remove the fully wound nonwoven fabric from the material rod.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] First, it is equipped with a winding assembly. After one material bar is wound up, the rotating frame rotates to switch the material bar position. The winding assembly can quickly clamp the nonwoven fabric on another idle material bar, so as to realize the continuous winding operation, eliminate downtime for changing rolls, and improve production efficiency.

[0012] Secondly, a sliding frame is provided, which can move along the guide rail to adjust the tension of the nonwoven fabric. When the winding assembly is working, the length of the nonwoven fabric between the sliding frame and the fixed frame can be extended to avoid needle punch deviation or fabric wrinkles caused by uneven tension and to provide a certain buffer space, thereby improving the consistency and yield of the finished nonwoven fabric. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the structure of an embodiment of the present utility model;

[0014] Figure 2 This is a schematic diagram of the assembly structure of the top plate and the needle plate;

[0015] Figure 3 This is a schematic diagram of the assembly structure of the first support frame and the second support frame;

[0016] Figure 4 This is a cross-sectional view of the winding assembly.

[0017] Explanation of reference numerals in the attached drawings: 1. Workbench; 2. Mounting plate; 3. Guide rod; 4. Guide rail; 5. Fixing frame; 6. Sliding frame; 7. Rotating roller; 8. First support frame; 9. Second support frame; 10. Rotating frame; 11. Material rod; 12. Cutting blade; 13. Top plate; 14. Needle plate; 15. Needle; 16. Bottom plate; 17. Placement groove; 18. Guide column; 19. First spring; 20. Mounting frame; 21. Rotating block; 22. Connecting rod; 23. Fixing plate; 24. Linkage rod; 25. First motor; 26. Second spring; 27. First electric push rod; 28. Second electric push rod; 29. ​​Slide rail; 30. Sliding block; 31. Third electric push rod; 32. Mounting box; 33. Rotating box; 34. Third motor; 35. Fourth motor; 36. Rotating rod; 37. Worm gear; 38. First gear; 39. Gear bar; 40. Drive rod; 41. Second gear; 42. Rotating shaft; 43. Clamping rod; 44. Third gear; 45. Support plate; 46. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0019] Example:

[0020] like Figure 1 and Figure 2 As shown, a nonwoven fabric needle punching device includes a worktable 1 and a mounting plate 2 fixed above the worktable 1. A needle punching assembly for needle punching nonwoven fabric is provided between the worktable 1 and the mounting plate 2. The needle punching assembly includes a top plate 13, a needle plate 14, a plurality of needles 15, and a bottom plate 16. The top plate 13 is fixed to the bottom of two guide rods 3, and a placement groove 17 for placing the needle plate 14 is opened in the top plate 13. The needle plate 14 is detachably placed in the placement groove 17. A plurality of needles 15 are placed at the bottom of the needle plate 14. The bottom plate 16 is located below the needle plate 14. A plurality of holes for the needles 15 to slide through are opened on the bottom plate 16. Guide posts 18 are fixed at both ends of the bottom plate 16. Both guide posts 18 slide through the needle plate 14. A first spring 19 is sleeved on both guide posts 18. The two ends of the two first springs 19 are fixedly connected to the needle plate 14 and the bottom plate 16, respectively.

[0021] like Figure 1 and Figure 2 As shown, the drive assembly pushes the top plate 13 downward via the guide rod 3. The needle plate 14 drives the needles 15 to pass through the holes in the bottom plate 16 and pierce the nonwoven fabric. After the needles 15 contact the nonwoven fabric, the needle plate 14 moves upward along the guide post 18 under resistance, compressing the first spring 19 to absorb the impact force. When the needles 15 return, the first spring 19 releases its elasticity to assist the needle plate 14 in resetting. The guide post 18 and the first spring 19 form a buffer system to reduce the risk of needle breakage. The needle plate 14 is detachable, supporting quick replacement of needles 15 of different specifications, adapting to the production of multiple types of nonwoven fabrics. The holes in the bottom plate 16 position the path of the needles 15 to avoid fiber web deviation.

[0022] like Figure 1 and Figure 2 As shown, two guide rods 3 are fixedly mounted above the acupuncture assembly. Both guide rods 3 slide through the mounting plate 2. The mounting plate 2 is equipped with a driving assembly for driving the two guide rods 3 to move vertically. The driving assembly includes a mounting frame 20, two rotating blocks 21, a connecting rod 22, a fixing plate 23, two linkage rods 24, and a first motor 25. The mounting frame 20 is fixedly mounted on the mounting plate 2. The two rotating blocks 21 are rotatably mounted on both sides of the mounting frame 20. The two ends of the connecting rod 22 are respectively fixedly connected to the two rotating blocks 21. The bottom of the fixed plate 23 is fixedly connected to the top of the two guide rods 3. The two ends of the two linkage rods 24 are respectively rotatably mounted on the connecting rod 22 and the fixed plate 23. The first motor 25 is fixedly mounted on the mounting frame 20 and the output end of the first motor 25 is fixedly connected to one of the rotating blocks 21. The two guide rods 3 are each fitted with a second spring 26. The two ends of the two second springs 26 are respectively fixedly connected to the bottom of the mounting plate 2 and the top of the top plate 13. The workbench 1 is fixedly provided with a support plate 46, and the support plate 46 has holes corresponding to those on the bottom plate 16.

[0023] like Figure 1 and Figure 2 As shown, the first motor 25 drives the rotating block 21 to rotate, and pulls the linkage rod 24 through the connecting rod 22, converting the rotational motion into the vertical reciprocating motion of the fixed plate 23. The second spring 26 can provide a certain buffering force to reduce the motor load.

[0024] like Figure 1 and Figure 2 As shown, a guide rail 4 is fixed on one side of the workbench 1, a fixed frame 5 is fixed on the guide rail 4, a sliding frame 6 is slidably arranged inside the guide rail 4, a first electric push rod 27 for driving the moving frame to move is provided on the workbench 1, and a plurality of rotating rollers 7 are rotatably arranged on the fixed frame 5 and the sliding frame 6. The nonwoven fabric after the needle punching assembly is completed is sequentially wound around the plurality of rotating rollers 7 on the fixed frame 5 and the moving frame.

[0025] like Figure 1 and Figure 2As shown, the needle-punched nonwoven fabric is wound around the rotating roller 7 of the fixed frame 5 and the sliding frame 6 to form an S-shaped path. The first electric push rod 27 pushes the sliding frame 6 to move along the guide rail 4, and adjusts the spacing of the rotating roller 7 in real time to control the tension of the nonwoven fabric. When the subsequent winding assembly changes rolls without stopping the machine, the nonwoven fabric buffered between the fixed frame 5 and the sliding frame 6 is extended to facilitate the subsequent winding operation of the nonwoven fabric by the winding assembly.

[0026] like Figure 1 and Figure 3 and Figure 4 As shown, a first support frame 8 and a second support frame 9 are fixedly mounted on the side of the guide rail 4 away from the worktable 1. A rotating frame 10 is rotatably mounted on the first support frame 8. A second motor 28 is fixedly mounted on the first support frame 8. The output end of the second motor 28 is used to drive the rotating frame 10 to rotate. Material rods 11 are fixedly mounted at both ends of the rotating frame 10. A cutting blade 12 for cutting nonwoven fabric is mounted on the second support frame 9. A second electric push rod 29 is fixedly mounted on the second support frame 9. The cutting blade 12 is fixed on the telescopic end of the second electric push rod 29. A winding assembly for clamping the nonwoven fabric on one of the material rods 11 and winding up the nonwoven fabric is mounted on the second support frame 9.

[0027] like Figure 1 and Figure 3 and Figure 4 As shown, the cutting blade 12 is pushed by the second electric push rod 29 to cut the nonwoven fabric. The third electric push rod 32 drives the sliding block 31 to move laterally, so that the winding assembly clamps the new material rod 11. The second motor 28 drives the rotating frame 10 to rotate 180°, switching between the full roll and empty material rod 11 positions. In the initial state, the material rod 11 is fitted with a material cylinder, and the nonwoven fabric is wound on the material cylinder. The winding assembly can clamp and rotate the nonwoven fabric on the material cylinder. When the nonwoven fabric on the material cylinder is fully rolled, the third electric push rod 32 drives the winding assembly to move away and release the clamping of the material cylinder. Then, it drives the rotating frame 10 to rotate. Then, the winding assembly clamps the material cylinder that is not fully rolled. Subsequently, the cutting blade 12 cuts the nonwoven fabric. The winding assembly drives the material cylinder again and winds up the nonwoven fabric. Before the cutting blade 12 cuts the nonwoven fabric, the sliding frame 6 gradually moves away from the fixed frame 5.

[0028] like Figure 1 and Figure 3 and Figure 4As shown, the second support frame 9 is provided with a slide rail 30, and a sliding block 31 is slidably provided on the slide rail 30. The winding assembly is provided on the sliding block 31. The second support frame 9 is fixedly provided with a third electric push rod 32 for driving the sliding block 31 to move on the slide rail 30. The winding assembly includes a mounting box 33, a rotating box 34, a third motor 35, a fourth motor 36, a rotating rod 37, a worm gear 38, two first gears 39, a hollow ring gear 40, a drive rod 41, two second gears 42, a rotating shaft 43, two clamping rods 44, and a third gear 45. The mounting box 33 is fixedly provided on the sliding block 31, and the rotating box 34 is rotatably provided on the mounting box 33. The third motor 35 and the fourth motor 36 are both fixedly provided inside the mounting box 33. The rotating rod 37 is rotatably provided inside the mounting box 33, and one end of the rotating rod 37 is rotatably provided on the rotating box 34. One end of the worm gear 38 is fixed to the output end of the fourth motor 36, and the other end is rotatably mounted in the mounting box 33. The two first gears 39 are respectively fixed to the output end of the third motor 35 and the rotating rod 37, and the two first gears 39 mesh. The gear bar 40 is sleeved on the rotating rod 37. The drive rod 41 is rotatably mounted in the mounting box 33. The two second gears 42 are both fixed to the drive rod 41, and one of the second gears 42 meshes with the gear bar 40, and the other second gear 42 meshes with the worm gear 38. The rotating shaft 43 is rotatably mounted in the rotating box 34, and the outer surfaces of both ends of the rotating shaft 43 are respectively provided with external threads in opposite directions. The ends of the two clamping rods 44 are both provided with internal threads, and the two clamping rods 44 are respectively threaded to the external threads at both ends of the rotating shaft 43. The third gear 45 is fixed to the rotating shaft 43 and meshes with the gear bar 40.

[0029] like Figure 1 and Figure 3 and Figure 4 As shown, the fourth motor 36 drives the worm gear 38, the worm gear 38 drives the second gear 42, the second gear 42 drives the gear bar 40 to move axially, the movement of the gear bar 40 drives the third gear 45 to rotate, the rotation of the third gear 45 drives the rotating shaft 43, the reverse threads at both ends of the rotating shaft 43 drive the two clamping rods 44 to clamp the material rod 11, the third motor 35 drives the rotating rod 37 through the first gear 39, the rotating rod 37 drives the rotating box 34 to rotate, thereby the rotating box 34 drives the two clamping rods 44 to rotate.

[0030] Working principle:

[0031] The first motor 25 on the mounting frame 20 drives the rotating block 21 to rotate. The rotating block 21 drives the connecting rod 22, and the connecting rod 22 drives the linkage rod 24 to push the fixed plate 23 to move vertically. The fixed plate 23 drives the guide rod 3 to rise and fall. The top plate 13 at the bottom of the guide rod 3 moves synchronously to realize the reciprocating movement of the needle assembly. When the guide rod 3 descends, the top plate 13 is pushed down by the guide rod 3 to move the needle plate 14, which drives the needle 15 to pierce the bottom plate 16. When the needle 15 contacts the non-woven fabric, the resistance causes the needle plate 14 to slide up along the guide post 18 and compress the first spring 19. When the needle 15 returns, the first spring 19 rebounds to help the needle plate 14 reset.

[0032] When the material rod 11 on the rotating frame 10 is fully wound, the first electric push rod 27 drives the sliding frame 6 away from the fixed frame 5. Then, the third electric push rod 32 drives the sliding block 31 and the two clamping rods 44 on the sliding block 31 to disengage from the fully wound material cylinder. After that, the second motor 28 drives the rotating frame 10 to rotate 180°, rotating the fully wound material rod 11 to the side away from the fixed frame 5. Then, the third electric push rod 32 drives the sliding block 31 to move along the slide rail 30, causing the two clamping rods 44 to approach the new material rod 11. At this time, one clamping rod 44 is located above the material cylinder and the nonwoven fabric, and the other clamping rod 44 is located below the material cylinder. Then, the operator starts the fourth motor 36. The worm gear 38 is driven by the worm gear 36. The rotation of the worm gear 38 drives the meshing second gear 42. The drive rod 41 links the two second gears 42 and transmits power to the ring gear 40 to move. The gear 40 drives the third gear 45. The third gear 45 drives the rotating shaft 43 to rotate. The threads at both ends of the rotating shaft 43 rotate in opposite directions, thereby driving the two clamping rods 44 to retract inward synchronously and clamp. Then, the second electric push rod 29 pushes the cutting knife 12 to cut the nonwoven fabric. The nonwoven fabric on the full roll rod 11, together with the material cylinder, moves out of the work station. The new material rod 11 is in place. The nonwoven fabric is wrapped around the rotating roller 7 of the fixed frame 5 and the sliding frame 6. The first electric push rod 27 pushes the sliding frame 6 to adjust the position and maintain constant tension.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A nonwoven fabric needle punching device, comprising a worktable (1) and a mounting plate (2) fixed above the worktable (1), wherein a needle punching assembly for needle punching nonwoven fabric is provided between the worktable (1) and the mounting plate (2), two guide rods (3) are fixed above the needle punching assembly, both guide rods (3) slide through the mounting plate (2), a driving assembly for driving the two guide rods (3) to move vertically is provided on the mounting plate (2), a guide rail (4) is fixed on one side of the worktable (1), a fixed frame (5) is fixed on the guide rail (4), and a sliding frame (6) is slidably provided inside the guide rail (4), the fixed frame (5) and the sliding frame (6) A plurality of rotating rollers (7) are rotatably provided on the upper part. The nonwoven fabric after the needle punching assembly is completed is sequentially wound around the plurality of rotating rollers (7) on the fixed frame (5) and the movable frame. The guide rail (4) is fixedly provided with a first support frame (8) and a second support frame (9) on the side away from the worktable (1). A rotating frame (10) is rotatably provided on the first support frame (8). Material rods (11) are fixed at both ends of the rotating frame (10). A cutting knife (12) for cutting the nonwoven fabric is provided on the second support frame (9). A winding assembly for clamping the nonwoven fabric on one of the material rods (11) and winding the nonwoven fabric is provided on the second support frame (9).

2. A needle punch apparatus for nonwoven fabric according to claim 1, wherein: The acupuncture assembly includes a top plate (13), a needle plate (14), a plurality of needles (15), and a bottom plate (16). The top plate (13) is fixed to the bottom of two guide rods (3), and a placement groove (17) for placing the needle plate (14) is provided in the top plate (13). The needle plate (14) is detachably placed in the placement groove (17). A plurality of needles (15) are placed at the bottom of the needle plate (14). The bottom plate (16) is located below the needle plate (14), and a plurality of holes for the needles (15) to slide through are provided on the bottom plate (16).

3. A needle punch apparatus for nonwoven fabric according to claim 2, wherein: Guide posts (18) are fixed at both ends of the base plate (16). Both guide posts (18) slide through the needle plate (14). A first spring (19) is sleeved on both guide posts (18). The two ends of the first spring (19) are fixed to the needle plate (14) and the base plate (16) respectively.

4. The nonwoven needle punch apparatus of claim 1, wherein: The drive assembly includes a mounting frame (20), two rotating blocks (21), a connecting rod (22), a fixing plate (23), two linkage rods (24), and a first motor (25). The mounting frame (20) is fixed on the mounting plate (2). The two rotating blocks (21) are rotatably mounted on both sides of the mounting frame (20). The two ends of the connecting rod (22) are fixedly connected to the two rotating blocks (21) respectively. The bottom of the fixing plate (23) is fixedly connected to the top of the two guide rods (3). The two ends of the linkage rods (24) are rotatably mounted on the connecting rod (22) and the fixing plate (23) respectively. The first motor (25) is fixed on the mounting frame (20), and the output end of the first motor (25) is fixedly connected to one of the rotating blocks (21).

5. A needle punch apparatus for nonwoven fabric according to claim 4, wherein: A second spring (26) is fitted on each of the two guide rods (3), and the two ends of the second spring (26) are fixed to the bottom of the mounting plate (2) and the top of the top plate (13) respectively.

6. The nonwoven fabric needle punching device according to claim 1, characterized in that: The workbench (1) is provided with a first electric push rod (27) for driving the moving frame to move.

7. The nonwoven fabric needle punching device according to claim 1, characterized in that: A second motor (28) is fixed on the first support frame (8), and the output end of the second motor (28) is used to drive the rotating frame (10) to rotate.

8. The nonwoven fabric needle punching device according to claim 1, characterized in that: The second support frame (9) is fixedly provided with a second electric push rod (29), and the cutting blade (12) is fixedly provided on the telescopic end of the second electric push rod (29).

9. The nonwoven fabric needle punching device according to claim 1, characterized in that: The second support frame (9) is provided with a slide rail (30), and a sliding block (31) is slidably provided on the slide rail (30). The winding assembly is provided on the sliding block (31). A third electric push rod (32) for driving the sliding block (31) to move on the slide rail (30) is fixed on the second support frame (9).

10. A nonwoven fabric needle punching device according to claim 1, characterized in that: The winding assembly includes a mounting box (33), a rotating box (34), a third motor (35), a fourth motor (36), a rotating rod (37), a worm gear (38), two first gears (39), a hollow ring gear (40), a drive rod (41), two second gears (42), a rotating shaft (43), two clamping rods (44), and a third gear (45). The mounting box (33) is fixed on the sliding block (31), the rotating box (34) is rotatably mounted on the mounting box (33), the third motor (35) and the fourth motor (36) are both fixed inside the mounting box (33), the rotating rod (37) is rotatably mounted inside the mounting box (33) with one end rotatably mounted on the rotating box (34), one end of the worm gear (38) is fixed on the output end of the fourth motor (36), and the other end is rotatably mounted inside the mounting box (33). A gear (39) is fixedly mounted on the output end of the third motor (35) and the rotating rod (37), and the two first gears (39) mesh. The gear bar (40) is sleeved on the rotating rod (37). The drive rod (41) is rotatably mounted in the mounting box (33). The two second gears (42) are fixedly mounted on the drive rod (41), and one of the second gears (42) meshes with the gear bar (40), while the other second gear (42) meshes with the worm (38). The rotating shaft (43) is rotatably mounted in the rotating box (34), and the outer surfaces of both ends of the rotating shaft (43) are respectively provided with external threads in opposite directions. The ends of the two clamping rods (44) are provided with internal threads, and the two clamping rods (44) are respectively threaded to the external threads at both ends of the rotating shaft (43). The third gear (45) is fixedly mounted on the rotating shaft (43), and the third gear (45) meshes with the gear bar (40).

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