Wear-resistant lamp string sheath processing device

Abstract

The invention relates to the technical field of lamp string sheath processing, and particularly discloses a wear-resistant lamp string sheath processing device which comprises a supporting seat and a controller, a winding mechanism is arranged at one end of one supporting plate, an unwinding mechanism is arranged at one end of the other supporting plate, a sheath is arranged on the outer side of the unwinding mechanism, and the controller is arranged on the outer side of the sheath. Storage frames are arranged on the two sides of the protective sleeve, wear-resistant semi-rings are placed on the inner sides of the storage frames, an adjusting mechanism is arranged at one end of each storage frame, and gluing mechanisms are arranged on the two sides of the protective sleeve; by means of the structures such as the movable plate and the push plate, two adjacent wear-resistant semi-rings can form a complete wear-resistant ring to be fixed to the outer side of the protective sleeve, manual operation is not needed, the working efficiency is improved, working of workers is facilitated, when the protective sleeve is dragged, the wear-resistant ring can support the protective sleeve, and the protective sleeve is prevented from being damaged. And the friction between the sheath and the ground is reduced, so that the wear of the sheath is reduced, and the service life of the sheath is prolonged.

Description

Technical Field

[0001] This invention relates to the field of light string sheath processing technology, and in particular to a wear-resistant light string sheath processing device. Background Technology

[0002] LED string lights have a wide range of applications and can be used both indoors and outdoors. When string lights are used outdoors, such as for setting up outdoor stages, outdoor camping, or other temporary outdoor activities, they are often dragged on the ground. In order to protect the internal components, a string light sleeve needs to be installed on the outside of the LED string light.

[0003] Existing LED light strings or light strips often suffer damage due to frequent friction between the outer sheath and the ground during use. Damage to the sheath can lead to damage to the flexible circuit board and LED chips inside. Therefore, a wear-resistant ring needs to be installed on the outer side of the sheath to reduce friction between the sheath and the ground. In current technology, the wear-resistant ring is usually installed manually, which is not only inefficient but also cumbersome. Therefore, a wear-resistant light string sheath processing device is proposed to address the above problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a wear-resistant light string sheath processing device.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] This application discloses a wear-resistant light string sheath processing device, including a support base and a controller. The controller is fixedly connected to one end of the support base, and support plates are fixedly connected to both ends of the support base. One end of one support plate is provided with a winding mechanism, and the other end of the support plate is provided with an unwinding mechanism. A sheath is provided on the outer side of the unwinding mechanism. Storage frames are provided on both sides of the sheath. A wear-resistant semi-ring is placed inside the storage frame. An adjustment mechanism is provided at one end of the storage frame, and an adhesive application mechanism is provided on both sides of the sheath.

[0007] To optimize the above technical solution, the following technical measures were also adopted:

[0008] Furthermore, the adjustment mechanism includes a slide rail fixedly connected to the support base, a movable plate slidably connected to the outer side of the slide rail, and the movable plate slidably connected to the support base. A first electric telescopic rod is fixedly connected to one end of the movable plate, and the first electric telescopic rod is fixedly connected to the support base. The movable plate is fixedly connected to the storage frame, and a pushing component is provided at one end of the wear-resistant semi-ring.

[0009] Furthermore, the pushing assembly includes a side plate fixedly connected to the moving plate, one end of which is fixedly connected to a second motor, the end of the main shaft of the second motor is fixedly connected to a screw, a push plate is helically connected to the outside of the screw, and the push plate is disposed on one side of the wear-resistant semi-ring, and the push plate is slidably connected to the storage frame.

[0010] Furthermore, a guide rod is slidably connected to the inner side of one end of the push plate, and the guide rod is fixedly connected to the side plate.

[0011] Furthermore, the adhesive application mechanism includes a storage box fixedly connected to a support base. A connecting shell is fixedly connected to the top of the storage box. A second electric telescopic rod is fixedly connected to the inner side of the connecting shell. A liquid outlet shell is fixedly connected to the other end of the second electric telescopic rod. A sponge block is fixedly connected to one end of the liquid outlet shell. A water pump is fixedly connected to one end of the connecting shell. The inlet end of the water pump is connected to the storage box, and the outlet end of the water pump is connected to a delivery pipe, which is also connected to the liquid outlet shell.

[0012] Furthermore, the liquid outlet shell has a liquid outlet at one end that is attached to the sponge block.

[0013] Furthermore, the shape of the liquid outlet shell is adapted to the shape of the wear-resistant semi-ring.

[0014] Furthermore, the winding mechanism includes a first support frame fixedly connected to one of the support plates, and there are two first support frames. One end of one of the first support frames is fixedly connected to a first motor, and the end of the main shaft of the first motor is fixedly connected to a fixing ring. A locking screw is screwed to the inner side of one end of the fixing ring, and a take-up rod is engaged on the inner side of the fixing ring.

[0015] Furthermore, the unwinding mechanism includes a second support frame fixedly connected to another support plate. A wire feeding rod is rotatably connected to the inner side of the second support frame. A fixing plate is fixedly connected to one end of the second support frame. A guide shaft is slidably connected to the inner side of the fixing plate. A friction block is fixedly connected to the top end of the guide shaft, and the friction block engages with the wire feeding rod. A limit block is fixedly connected to the bottom end of the guide shaft. A spring is provided on the outer side of the guide shaft, and both ends of the spring are fixedly connected to the fixing plate and the limit block, respectively.

[0016] Due to the adoption of the above technical solutions, the present invention has the following beneficial effects:

[0017] On the one hand, the present invention can fix two adjacent wear-resistant half rings into a complete wear-resistant ring on the outside of the sheath by setting up a moving plate and push plate, etc., without the need for manual operation, which improves work efficiency and facilitates the work of the staff. When the sheath is dragged, the wear-resistant ring will support the sheath, reduce the friction between the sheath and the ground, thereby reducing the wear of the sheath and increasing the service life of the sheath.

[0018] On the other hand, the structure of the liquid outlet shell and sponge block allows the glue inside the liquid outlet shell to be evenly applied to the surface of the wear-resistant semi-ring through the sponge block, so that the corresponding wear-resistant semi-rings can be bonded together without manual application, avoiding the inconvenience of application due to the small size of the wear-resistant semi-rings. In addition, the storage box can collect the glue dripping from the sponge block, which saves glue.

[0019] On the other hand, the structure of springs and friction blocks can be used to hinder the rotation of the line-laying rod, so that the rotation of the line-laying rod is subjected to greater friction, ensuring that the sheath can be kept taut when the line-retracting rod is winding up, thus facilitating the fixation of the wear-resistant semi-ring on the outside of the sheath. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0021] Figure 1 This is a schematic diagram of the overall structure of a wear-resistant light string sheath processing device according to the present invention.

[0022] Figure 2 This is a schematic diagram of the installation structure of the push plate of the wear-resistant light string sheath processing device of the present invention.

[0023] Figure 3 This is a schematic diagram of the pusher plate structure of a wear-resistant light string sheath processing device according to the present invention.

[0024] Figure 4 This is a schematic diagram of the inner mounting structure of the connecting shell of a wear-resistant light string sheath processing device according to the present invention.

[0025] Figure 5 This is a schematic diagram of the installation structure of the liquid outlet of a wear-resistant light string sheath processing device according to the present invention.

[0026] Figure 6 This is a schematic diagram of the installation structure of the fixing ring of the wear-resistant light string sheath processing device of the present invention.

[0027] Figure 7 This is a schematic diagram of the installation structure of the friction block in a wear-resistant light string sheath processing device according to the present invention.

[0028] Figure label:

[0029] 1. Support base; 2. Controller; 3. Support plate; 4. First support frame; 5. Second support frame; 6. Feed rod; 7. Take-up rod; 8. Spring; 9. Guide shaft; 10. Friction block; 11. Fixing plate; 12. Sheath; 13. First motor; 14. Locking screw; 15. Fixing ring; 16. First electric telescopic rod; 17. Slide rail; 18. Moving plate; 19. Storage frame; 20. Wear-resistant semi-ring; 21. Side plate; 22. Second motor; 23. Push plate; 24. Screw; 25. Guide rod; 26. Connecting shell; 27. Storage box; 28. Water pump; 29. ​​Infusion tube; 30. Discharge shell; 31. Sponge block; 32. Second electric telescopic rod; 33. Discharge port; 34. Limiting block. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] Unless otherwise defined, the technical or scientific terms used in this patent document shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this patent specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or its equivalents, and do not exclude other elements or objects. Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. These terms are only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0033] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, features in the following embodiments can be combined with each other.

[0034] like Figure 1-7 As shown, a wear-resistant light string sheath processing device includes a support base 1 and a controller 2. The controller 2 is fixedly connected to one end of the support base 1, and support plates 3 are fixedly connected to both ends of the support base 1. One end of one support plate 3 is provided with a winding mechanism, and the other end of the support plate 3 is provided with an unwinding mechanism. A sheath 12 is provided on the outside of the unwinding mechanism. Storage frames 19 are provided on both sides of the sheath 12. Wear-resistant semi-rings 20 are placed inside the storage frames 19. An adjustment mechanism is provided at one end of the storage frames 19. Glue application mechanisms are provided on both sides of the sheath 12. The wear-resistant semi-rings 20 are made of wear-resistant rubber sheets. Two wear-resistant semi-rings 20 can form a complete wear-resistant rubber ring, which supports the sheath 12 and prevents the sheath 12 from contacting the ground.

[0035] Please see Figure 1 , Figure 2 and Figure 3 As shown, as a further improvement of the present invention, the adjustment mechanism includes a slide rail 17 fixedly connected to the support base 1, a movable plate 18 slidably connected to the outer side of the slide rail 17, and the movable plate 18 slidably connected to the support base 1. A first electric telescopic rod 16 is fixedly connected to one end of the movable plate 18, and the first electric telescopic rod 16 is fixedly connected to the support base 1. The movable plate 18 is fixedly connected to the storage frame 19. A pushing component is provided at one end of the wear-resistant semi-ring 20. With the cooperation of the first electric telescopic rod 16 and the movable plate 18, the position of the wear-resistant semi-ring 20 can be adjusted so that the two opposite wear-resistant semi-rings 20 can be stuck together.

[0036] Please see Figure 1 and Figure 2As shown, as a further improvement of the present invention, the pushing assembly includes a side plate 21 fixedly connected to the moving plate 18. A second motor 22 is fixedly connected to one end of one side plate 21. A screw 24 is fixedly connected to the end of the main shaft of the second motor 22. A push plate 23 is spirally connected to the outer side of the screw 24, and the push plate 23 is disposed on one side of the wear-resistant semi-ring 20. The push plate 23 is slidably connected to the storage frame 19. The push plate 23 can push out the wear-resistant semi-ring 20 inside the storage frame 19, ensuring that the wear-resistant semi-ring 20 can be coated with adhesive. Simultaneously, the wear-resistant semi-ring 20 can be adhered to the outer side of the protective sleeve 12, eliminating the need for manual operation, improving work efficiency, and facilitating the work of the staff. When the protective sleeve 12 is dragged... The wear-resistant rubber ring supports the sheath 12, reducing friction between the sheath 12 and the ground, thereby reducing wear and increasing the service life of the sheath 12. The push plate 23 is L-shaped, which ensures that the push plate 23 can push the wear-resistant half ring 20 to the outlet edge of the storage frame 19. The second motor 22 is a servo motor, and the number of rotations of the second motor 22 can be controlled by the PLC program inside the controller 2, ensuring that the push plate 23 can push the wear-resistant half ring 20 to the outlet of the storage frame 19 every time. At the same time, a ring of anti-slip rubber pad can be fixed on the inner wall of the storage frame 19 to increase the friction between the wear-resistant half ring 20 and the storage frame 19, ensuring that the wear-resistant half ring 20 will not tilt or fall off at the outlet.

[0037] Please see Figure 1 , Figure 2 and Figure 3 As shown, as a further improvement of the present invention, a guide rod 25 is slidably connected to the inner side of one end of the push plate 23, and the guide rod 25 is fixedly connected to the side plate 21. Under the guidance of the guide rod 25, the normal movement of the push plate 23 can be guaranteed.

[0038] Please see Figure 1 , Figure 4 and Figure 5As shown, as a further improvement of the present invention, the adhesive application mechanism includes a storage box 27 fixedly connected to the support base 1. A connecting shell 26 is fixedly connected to the top of the storage box 27. A second electric telescopic rod 32 is fixedly connected to the inner side of the connecting shell 26. An outlet shell 30 is fixedly connected to the other end of the second electric telescopic rod 32. A sponge block 31 is fixedly connected to one end of the outlet shell 30. A water pump 28 is fixedly connected to one end of the connecting shell 26. The inlet end of the water pump 28 is connected to the storage box 27, and the outlet end of the water pump 28 is connected to an infusion pipe 29. The infusion pipe 29 is connected to the outlet shell 30, so that the adhesive inside the outlet shell 30 can be evenly applied to the surface of the wear-resistant semi-ring 20 through the sponge block 31, so that the opposite wear-resistant semi-rings 20 can be bonded together. Manual application is not required, avoiding the inconvenience of application due to the small size of the wear-resistant semi-rings 20. The storage box 27 can collect the adhesive dripping from the sponge block 31, which saves adhesive.

[0039] Please see Figure 5 As shown, as a further improvement of the present invention, the end of the liquid outlet shell 30 that is attached to the sponge block 31 is provided with a liquid outlet 33, so that the glue inside the liquid outlet shell 30 can flow to the inside of the sponge block 31 through the liquid outlet 33.

[0040] Please see Figure 1 , Figure 4 and Figure 5 As shown, as a further improvement of the present invention, the shape of the liquid outlet shell 30 is adapted to the shape of the wear-resistant semi-ring 20 to ensure that the sponge block 31 can apply glue to all areas of the wear-resistant semi-ring 20 that need to be coated with glue, preventing any missed areas.

[0041] Please see Figure 1 and Figure 6 As shown, as a further improvement of the present invention, the winding mechanism includes a first support frame 4 fixedly connected to one of the support plates 3, and there are two first support frames 4. One end of one of the first support frames 4 is fixedly connected to a first motor 13. The end of the main shaft of the first motor 13 is fixedly connected to a fixing ring 15. A locking screw 14 is screwed to the inner side of one end of the fixing ring 15. A take-up rod 7 is engaged on the inner side of the fixing ring 15. The fixing ring 15 facilitates the quick installation and disassembly of the take-up rod 7. At the same time, the rotation of the take-up rod 7 can realize the winding of the sheath 12. The first motor 13 is a servo motor, and the start and stop of the first motor 13 can be controlled by the PLC program inside the controller 2, so that the wear-resistant semi-rings 20 are fixed at intervals on the outer side of the sheath 12.

[0042] Please see Figure 1 and Figure 7As shown, as a further improvement of the present invention, the unwinding mechanism includes a second support frame 5 fixedly connected to another support plate 3. A wire feeding rod 6 is rotatably connected to the inner side of the second support frame 5. A fixing plate 11 is fixedly connected to one end of the second support frame 5. A guide shaft 9 is slidably connected to the inner side of the fixing plate 11. A friction block 10 is fixedly connected to the top end of the guide shaft 9, and the friction block 10 engages with the wire feeding rod 6. A limit block 34 is fixedly connected to the bottom end of the guide shaft 9. A spring 8 is provided on the outer side of the guide shaft 9, and both ends of the spring 8 are fixedly connected to the fixing plate 11 and the limit block 34, respectively. Through the provided spring 8 and friction block 10 and other structures, the rotation of the wire feeding rod 6 can be hindered, so that the rotation of the wire feeding rod 6 is subjected to greater friction force, ensuring that the sheath 12 is in a taut state when the take-up rod 7 winds up the sheath 12, thereby facilitating the fixation of the wear-resistant semi-ring 20 on the outer side of the sheath 12.

[0043] The working principle of this invention is as follows: This device is powered by an external power source, and the controller 2 supplies power to the electrical components of the device. First, the operator places sufficient wear-resistant semi-rings 20 inside the storage boxes 19 on both sides, simultaneously positioning the push plate 23 on one side of the wear-resistant semi-rings 20. An appropriate amount of glue is placed inside the storage box 27. Then, the wire-feeding rod 6 with the sheath 12 is placed inside the second support frame 5. Simultaneously, under the elastic force of the spring 8, the guide shaft 9, carrying the friction block 10, engages with the wire-feeding rod 6. The friction block 10 impedes the rotation of the wire-feeding rod 6, increasing the frictional force and ensuring the winding rod 7... When winding up the sheath 12, it can be kept taut, making it easier to fix the wear-resistant semi-ring 20 to the outside of the sheath 12. Then, the take-up rod 7 is placed inside the first support frame 4, with one end placed inside the fixing ring 15. The take-up rod 7 is then fixed in place by the locking screw 14. First, one end of the sheath 12 is fixed to the outside of the take-up rod 7. Then, the first motor 13, through the fixing ring 15, drives the take-up rod 7 to wind up the sheath 12 in a regular manner. After the take-up rod 7 winds up the sheath 12 for a certain distance, the first motor 13 stops working. At this time, the controller 2 controls the second motor 22 to work, and the second motor 22 will also drive the screw 24. The push plate 23 rotates spirally inside, causing it to push the wear-resistant semi-ring 20 to move within the storage frame 19. This moves the end of the wear-resistant semi-ring 20 to the outlet of the storage frame 19. Then, the controller 2 controls the water pump 28 to deliver the glue inside the storage tank 27 through the infusion pipe 29 to the inside of the liquid storage shell 30 and the sponge block 31. Simultaneously, the second electric telescopic rod 21 moves the liquid outlet shell 30 and the sponge block 31 to one side of the wear-resistant semi-ring 20. As the sponge block 31 passes the wear-resistant semi-ring 20, it applies glue to one side of the ring. Then, the sponge block 31 and the liquid outlet shell 30 retract. Finally, the controller 2 controls the first electric telescopic rod 16 to move... The moving plate 18 moves towards the sheath 12, and at the same time, the moving plate 18 also moves towards the sheath 12 along with the corresponding wear-resistant semi-rings 20 through the storage box 19, until the two opposite wear-resistant semi-rings 20 are fitted onto the outside of the sheath 12. At the same time, the wear-resistant semi-rings 20 are also fixed to the outside of the sheath 12 under the action of glue. Then the moving plate 18 resets and waits for the next operation. Then the first motor 13 continues to wind up the sheath 12 with the take-up rod 7 through the fixing ring 15. Repeating the above steps will complete the work of fixing the wear-resistant semi-rings 20 at intervals on the outside of the sheath 12. The wear-resistant semi-rings 12 increase the overall wear resistance of the sheath 12.

[0044] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A wear-resistant light string sheath processing device, comprising a support base (1) and a controller (2), characterized in that: One end of the support base (1) is fixedly connected to a controller (2), and both ends of the support base (1) are fixedly connected to support plates (3). One end of one support plate (3) is provided with a winding mechanism, and the other end of the support plate (3) is provided with an unwinding mechanism. A protective sleeve (12) is provided on the outside of the unwinding mechanism. Storage frames (19) are provided on both sides of the protective sleeve (12). A wear-resistant semi-ring (20) is placed on the inside of the storage frame (19). An adjustment mechanism is provided at one end of the storage frame (19), and an adhesive applicator is provided on both sides of the protective sleeve (12).

2. The wear-resistant light string sheath processing device according to claim 1, characterized in that: The adjustment mechanism includes a slide rail (17) fixedly connected to the support base (1), a movable plate (18) is slidably connected to the outside of the slide rail (17), and the movable plate (18) is slidably connected to the support base (1). A first electric telescopic rod (16) is fixedly connected to one end of the movable plate (18), and the first electric telescopic rod (16) is fixedly connected to the support base (1). The movable plate (18) is fixedly connected to the storage frame (19). A pushing component is provided at one end of the wear-resistant semi-ring (20).

3. The wear-resistant light string sheath processing device according to claim 2, characterized in that: The pushing assembly includes a side plate (21) fixedly connected to the moving plate (18), one end of which is fixedly connected to a second motor (22), the end of the main shaft of the second motor (22) is fixedly connected to a screw (24), the outside of the screw (24) is spirally connected to a push plate (23), and the push plate (23) is disposed on one side of the wear-resistant semi-ring (20), and the push plate (23) is slidably connected to the storage frame (19).

4. The wear-resistant light string sheath processing device according to claim 3, characterized in that: A guide rod (25) is slidably connected to the inner side of one end of the push plate (23), and the guide rod (25) is fixedly connected to the side plate (21).

5. The wear-resistant light string sheath processing device according to claim 1, characterized in that: The adhesive application mechanism includes a storage box (27) fixedly connected to a support base (1). A connecting shell (26) is fixedly connected to the top of the storage box (27). A second electric telescopic rod (32) is fixedly connected to the inner side of the connecting shell (26). A liquid outlet shell (30) is fixedly connected to the other end of the second electric telescopic rod (32). A sponge block (31) is fixedly connected to one end of the liquid outlet shell (30). A water pump (28) is fixedly connected to one end of the connecting shell (26). The inlet end of the water pump (28) is connected to the storage box (27). The outlet end of the water pump (28) is connected to a delivery pipe (29), and the delivery pipe (29) is connected to the liquid outlet shell (30).

6. The wear-resistant light string sheath processing device according to claim 5, characterized in that: The liquid outlet shell (30) is provided with a liquid outlet (33) at one end that is attached to the sponge block (31).

7. The wear-resistant light string sheath processing device according to claim 5, characterized in that: The shape of the liquid outlet shell (30) is adapted to the shape of the wear-resistant semi-ring (20).

8. The wear-resistant light string sheath processing device according to claim 1, characterized in that: The winding mechanism includes a first support frame (4) fixedly connected to one of the support plates (3), and there are two first support frames (4). One end of one of the first support frames (4) is fixedly connected to a first motor (13). The end of the main shaft of the first motor (13) is fixedly connected to a fixing ring (15). A locking screw (14) is spirally connected to the inner side of one end of the fixing ring (15). A take-up rod (7) is engaged on the inner side of the fixing ring (15).

9. The wear-resistant light string sheath processing device according to claim 1, characterized in that: The unwinding mechanism includes a second support frame (5) fixedly connected to another support plate (3). A wire feeding rod (6) is rotatably connected to the inner side of the second support frame (5). A fixing plate (11) is fixedly connected to one end of the second support frame (5). A guide shaft (9) is slidably connected to the inner side of the fixing plate (11). A friction block (10) is fixedly connected to the top end of the guide shaft (9), and the friction block (10) engages with the wire feeding rod (6).

10. The wear-resistant light string sheath processing device according to claim 9, characterized in that: The bottom end of the guide shaft (9) is fixedly connected to a limiting block (34), and a spring (8) is provided on the outside of the guide shaft (9), with the two ends of the spring (8) fixedly connected to the fixing plate (11) and the limiting block (34) respectively.

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