Injection molding machine capable of improving superior product rate

Abstract

The injection molding machine capable of improving the superior product rate comprises an equipment box and a feeding pipe, a base is fixedly installed on the lower surface of the equipment box, a conveying mechanism is fixedly installed on the upper surface of the equipment box, a heating mechanism is fixedly installed on the upper surface of the equipment box, and an extrusion molding mechanism is fixedly installed on the upper surface of the equipment box; meanwhile, a feeding box is fixedly mounted on the upper surface of the conveying mechanism; the feeding device further comprises a door plate, and the door plate is connected to the surface of the feeding box in a hinged mode. When the injection molding machine capable of improving the superior product rate works, raw materials are added into a feeding box through a feeding pipe, meanwhile, a motor is started, the motor drives a cam to rotate, then a baffle does reciprocating rectilinear motion in the vertical direction under the action of the cam, a stand column and the gravity of the baffle, the feeding pipe is in an intermittent opening and closing state, and therefore the quality product rate can be improved. And finally, the purpose of intermittent feeding is achieved, the situation that materials are blocked in the feeding box is avoided, and normal proceeding of the next working procedure is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of injection molding machine technology, specifically to an injection molding machine that can improve the yield of high-quality products. Background Technology

[0002] Injection molding machines are mainly used to manufacture plastic products, such as plastic containers, toys, and automotive parts. They mainly consist of a feeding mechanism, a conveying mechanism, a heating mechanism, and an extrusion molding mechanism, and are widely used in the automotive and electronics industries.

[0003] For example, CN217073139U discloses an injection molding machine with convenient feeding, which includes an injection molding machine body and a feeding hopper fixedly mounted on the injection molding machine body. It also includes a fixed plate, a drive motor, a drain rod, spiral blades, and a vibration assembly. The fixed plate is positioned above the feeding hopper, the drive motor is fixedly mounted on the fixed plate, and the rotating shaft of the drive motor slides through the fixed plate. The drain rod is coaxially mounted on the rotating shaft of the drive motor and inserted into the feeding hopper. The spiral blades are coaxially fixed on the drain rod and used to rotate and drain the feeding hopper. The vibration assembly drives the fixed plate to reciprocate and vibrates, causing the drain rod and spiral blades to vibrate within the feeding hopper. This application facilitates the entry of plastic from the feeding hopper into the injection molding machine body.

[0004] For example, a convenient injection molding machine with publication number CN211763062U has the following key technical features: it includes an injection molding machine body and a feeding hopper mounted on the injection molding machine body, as well as a mounting frame and a collecting hopper mounted within the mounting frame. A feeding hose is connected to the bottom of the collecting hopper, and the end of the feeding hose away from the collecting hopper is connected to the feeding hopper. The mounting frame is equipped with a lifting mechanism for driving the collecting hopper to move vertically up and down. The collecting hopper has at least two states. In the first state, the collecting hopper is located at the bottom of the mounting frame, and the feeding hose is inclined upwards from the end connected to the collecting hopper to the end connected to the feeding hopper. In the second state, the collecting hopper is located at the top of the mounting frame, and the feeding hose is inclined downwards from the end connected to the collecting hopper to the end connected to the feeding hopper. This invention has the function of convenient feeding.

[0005] During use, when the feeding mechanism cannot feed steadily and there is residual material on the inner wall of the feeding mechanism, the conveying mechanism cannot be filled well and will run dry. This will cause the heating mechanism and the extrusion molding mechanism to not work well, resulting in no material being extruded from the extrusion molding mechanism. As a result, the probability of defective products is high when the final product is formed. The device in the above application does not have a good unloading structure, which cannot allow the material remaining on the inner wall to enter the next process well, resulting in low work efficiency.

[0006] To address the aforementioned issues, there is an urgent need for innovative design based on existing injection molding machines. Summary of the Invention

[0007] The purpose of this invention is to provide an injection molding machine that can improve the yield of high-quality products, thereby solving the problem mentioned in the background art that the machine does not have a good feeding structure, which prevents the material remaining on the inner wall from entering the next process and results in low work efficiency.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an injection molding machine that can improve the yield of high-quality products, comprising an equipment box and a feed pipe, wherein a base is fixedly installed on the lower surface of the equipment box, a conveying mechanism is fixedly installed on the upper surface of the equipment box, a heating mechanism is fixedly installed on the upper surface of the equipment box, and an extrusion molding mechanism is fixedly installed on the upper surface of the equipment box, while a feed box is fixedly installed on the upper surface of the conveying mechanism.

[0009] The feed pipe is fixedly installed on the upper surface of the feed box, and the feed pipe is fixedly connected to the output end of the external feeding device;

[0010] An injection molding machine that can improve the yield of high-quality products also includes:

[0011] A motor is fixedly installed on the inner wall of the feed box, and a cam is fixedly installed on the output end of the motor;

[0012] A baffle is slidably disposed inside the feed box, and the baffle is circular in plan view, and the upper surface of the baffle in frontal section view is inclined, and a connecting rod is fixedly installed on the lower surface of the baffle.

[0013] A scraper, which is fixedly installed at the end of the connecting rod;

[0014] A fixing plate is fixedly installed on the surface of the feed box, and a transition shaft is rotatably connected to the surface of the fixing plate, and a connecting shaft is rotatably connected to the surface of the fixing plate.

[0015] A limiting rod is fixedly installed on the surface of the feed box, and a movable plate is sleeved and connected to the surface of the limiting rod. A knocking block corresponding to the feed box is fixedly installed on the surface of the movable plate.

[0016] A door panel, which is hinged to the surface of the feed box.

[0017] Preferably, the lower surface of the baffle is in contact with the surface of the cam, and the length of the baffle is greater than the diameter of the feed pipe. During operation, raw materials are added into the feed box through the feed pipe.

[0018] Preferably, a column is fixedly installed on the inner wall of the feed box, and the column penetrates the interior of the baffle. The columns are symmetrically distributed about the center of the baffle, and the cross-section of the column is an inverted "T" shape. When the motor is working, the motor drives the cam to rotate, and the baffle moves in a reciprocating linear motion in the vertical direction under the action of the cam, the column and its own weight. As a result, the feed pipe is in an intermittent opening and closing state, which ultimately achieves the purpose of intermittent feeding, so that material blockage does not occur inside the feed box, ensuring the normal operation of the next process.

[0019] Preferably, the surface of the scraper is inclined, and the inner side of the scraper is in contact with the inner wall of the feed box. The scrapers are symmetrically distributed about the center of the feed box. When the baffle moves, the corresponding scraper moves through the connecting rod. When the scraper moves, it scrapes off the raw material on the inner wall of the feed box, avoiding material residue. At the same time, the scraper is in a moving state, so that the raw material will not remain on the surface of the scraper itself.

[0020] Preferably, a traction rope is fixedly installed on the inner surface of the scraper, and the other side of the traction rope is wound and fixedly connected to the surface of the connecting shaft. A docking rod is fixedly installed on the surface of the connecting shaft, and the traction rope is attached to the surface of the transition shaft. When the scraper moves downward, the scraper drives the connecting shaft to rotate on the surface of the fixed plate through the traction rope, and the transition shaft maximizes the tension of the traction rope.

[0021] Preferably, a first magnet is fixedly installed at the end of the docking rod, and a second magnet corresponding to the first magnet is fixedly installed on the side of the movable plate. The magnetic poles on the surface of the second magnet are the same as the magnetic poles at the end of the first magnet. When the connecting shaft rotates, the connecting shaft drives the docking rod to rotate synchronously, and the first magnet will intermittently approach the second magnet. When the first magnet approaches the second magnet, the movable plate moves towards the feed box under the action of mutual repulsive magnetic force.

[0022] Preferably, a connecting spring that provides elastic reset is fixedly installed on the surface of the movable plate, and the other side of the connecting spring is fixedly connected to the outer wall of the feed box. The lower surface of the feed box has a feeding port, and the lower end of the feed box is inclined. When the movable plate moves toward the feed box under the action of repulsive magnetic force, the connecting spring is squeezed. When the first magnet continues to rotate and moves away from the second magnet, the movable plate moves away from the feed box under the action of the connecting spring. The above process is repeated. Under the action of the limiting rod, the movable plate drives the striking block to make reciprocating linear motion in the horizontal direction.

[0023] Preferably, the striking blocks are evenly distributed on the surface of the movable plate, and the movable plate is rotatably connected with ball bearings. The surface of the ball bearings is in contact with the surface of the limiting rod, and the cross section of the limiting rod is an inverted "L" structure. When the striking blocks evenly distributed on the surface of the movable plate make reciprocating linear motion, they will strike the outer wall of the feed box repeatedly, causing the feed box to vibrate slightly. This allows the material to fall into the next working mechanism more effectively, improving work efficiency and ultimately increasing the yield of high-quality products. The ball bearings also make the movement of the movable plate smoother.

[0024] Preferably, the surface of the connecting shaft is concave, and protrusions are fixedly installed on both the upper and lower sides of the connecting shaft. The part of the transition shaft located inside the fixed plate is convex. When the connecting shaft rotates, the connecting shaft will drive the protrusions to rotate synchronously.

[0025] Preferably, a torsion spring with an elastic reset function is fixedly installed on the surface of the protrusion, and the other side of the torsion spring is fixedly connected to the inner wall of the fixed plate. When the protrusion rotates, it will stretch the torsion spring. When the scraper rises, the connecting shaft will lose the tension of the traction rope. At this time, the connecting shaft will rotate under the action of the torsion spring and the protrusion. When the connecting shaft rotates, the striking block will repeatedly make reciprocating linear motion in the horizontal direction, which further optimizes the material feeding effect. At the same time, when the connecting shaft rotates, it will rewind the traction rope for easy use next time.

[0026] Compared with the prior art, the beneficial effects of the present invention are: the injection molding machine that can improve the yield of high-quality products adopts a novel structural design, the specific details of which are as follows:

[0027] (1) When the injection molding machine that can improve the yield of high-quality products is working, the raw materials are added into the feed box through the feed pipe. At the same time, the motor is started and the motor drives the cam to rotate. Then, the baffle moves in a reciprocating linear motion in the vertical direction under the action of the cam, the column and its own gravity. Thus, the feed pipe is in an intermittent opening and closing state, which ultimately achieves the purpose of intermittent feeding, so that the material inside the feed box will not be blocked, and the next process will be carried out normally.

[0028] (2) When the baffle moves, the corresponding scraper moves through the connecting rod. When the scraper moves, the inclined surface of the scraper will scrape off the raw material on the inner wall of the feed box, avoiding material residue. At the same time, the scraper is in a moving state, so that the raw material will not remain on the surface of the scraper itself.

[0029] (3) In the process of the scraper descending and rising, the connecting shaft rotates forward and backward on the surface of the fixed plate under the action of the traction rope, the protrusion and the torsion spring. Then, the moving plate and the striking block reciprocate linearly in the horizontal direction under the action of the mutual repulsion of the first and second magnets, the connecting spring and the limiting rod. Then, the striking block will hit the outer wall of the feed box repeatedly, causing the feed box to vibrate slightly. This allows the material to fall into the next working mechanism better, improving work efficiency and ultimately increasing the yield of high-quality products. Attached Figure Description

[0030] Figure 1 This is a front view structural diagram of the equipment box of the present invention;

[0031] Figure 2 This is a schematic diagram of the front sectional view of the feed box of the present invention;

[0032] Figure 3 This is a schematic diagram of the connection structure between the baffle and the column of the present invention;

[0033] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0034] Figure 5 For the present invention Figure 2 Enlarged structural diagram at point B;

[0035] Figure 6 This is a partial front sectional view of the working state of the baffle of the present invention;

[0036] Figure 7 This is a partial front sectional view of the working state of the striking block of the present invention;

[0037] Figure 8 This is a schematic diagram of the torsion spring and the protrusion connection structure of the present invention;

[0038] Figure 9 This is a schematic diagram of the connection structure between the feed box and the door panel of the present invention.

[0039] In the diagram: 1. Equipment box; 2. Feed box; 3. Feed pipe; 4. Motor; 5. Cam; 6. Baffle; 7. Column; 8. Connecting rod; 9. Scraper; 10. Traction rope; 11. Fixing plate; 12. Connecting shaft; 13. Connecting rod; 14. First magnet; 15. Movable plate; 16. Second magnet; 17. Limiting rod; 18. Connecting spring; 19. Striking block; 20. Discharge port; 21. Torsion spring; 22. Ball bearing; 23. Transition shaft; 24. Protrusion; 25. Door panel. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Please see Figures 1-9 The present invention provides a technical solution: an injection molding machine that can improve the yield of high-quality products, including an equipment box 1 and a feed pipe 3. A base is fixedly installed on the lower surface of the equipment box 1, and a conveying mechanism is fixedly installed on the upper surface of the equipment box 1. A heating mechanism is fixedly installed on the upper surface of the equipment box 1, and an extrusion molding mechanism is fixedly installed on the upper surface of the equipment box 1. Meanwhile, a feed box 2 is fixedly installed on the upper surface of the conveying mechanism, and the feed pipe 3 is fixedly installed on the upper surface of the feed box 2. The feed pipe 3 is fixedly connected to the output end of an external feeding device.

[0042] An injection molding machine that can improve the yield of high-quality products also includes:

[0043] Motor 4 is fixedly installed on the inner wall of feed box 2, and cam 5 is fixedly installed on the output end of motor 4. Baffle 6 is slidably arranged inside feed box 2, and the top view of baffle 6 is circular, the upper surface of baffle 6 in frontal section is inclined, and a connecting rod 8 is fixedly installed on the lower surface of baffle 6.

[0044] Scraper 9 is fixedly installed at the end of connecting rod 8. Fixing plate 11 is fixedly installed on the surface of feed box 2, and a transition shaft 23 is rotatably connected to the surface of fixing plate 11, and a connecting shaft 12 is rotatably connected to the surface of fixing plate 11.

[0045] Limiting rod 17 is fixedly installed on the surface of feed box 2, and a movable plate 15 is sleeved and connected to the surface of limiting rod 17. A knocking block 19 corresponding to feed box 2 is fixedly installed on the surface of movable plate 15.

[0046] The door panel 25 is hinged to the surface of the feed box 2. The lower surface of the baffle 6 is in contact with the surface of the cam 5, and the length of the baffle 6 is greater than the diameter of the feed pipe 3. A column 7 is fixedly installed on the inner wall of the feed box 2, and the column 7 passes through the interior of the baffle 6. The column 7 is symmetrically distributed about the center of the baffle 6, and the cross section of the column 7 is an inverted "T" shape. The surface of the scraper 9 is inclined, and the inner side of the scraper 9 is in contact with the inner wall of the feed box 2. The scraper 9 is symmetrically distributed about the center of the feed box 2.

[0047] During operation, raw materials are added into the feed box 2 through the feed pipe 3. At the same time, the motor 4 is started, which drives the cam 5 to rotate. Under the action of the cam 5, the column 7 and its own gravity, the baffle 6 makes a reciprocating linear motion in the vertical direction. As a result, the feed pipe 3 is in an intermittent opening and closing state, which ultimately achieves the purpose of intermittent feeding and prevents material blockage inside the feed box 2, ensuring the normal operation of the next process. When the baffle 6 moves, it drives the corresponding scraper 9 to move through the connecting rod 8. When the scraper 9 moves, it scrapes off the raw materials on the inner wall of the feed box 2, avoiding material residue. At the same time, the moving state of the scraper 9 also prevents raw materials from remaining on its own surface.

[0048] A traction rope 10 is fixedly installed on the inner surface of the scraper 9, and the other side of the traction rope 10 is wound and fixedly connected to the surface of the connecting shaft 12. A docking rod 13 is fixedly installed on the surface of the connecting shaft 12, and the traction rope 10 is attached to the surface of the transition shaft 23.

[0049] A first magnet 14 is fixedly installed at the end of the connecting rod 13, and a second magnet 16 corresponding to the first magnet 14 is fixedly installed on the side of the movable plate 15, and the magnetic poles on the surface of the second magnet 16 are the same as the magnetic poles at the end of the first magnet 14.

[0050] A connecting spring 18 that provides elastic reset is fixedly installed on the surface of the movable plate 15, and the other side of the connecting spring 18 is fixedly connected to the outer wall of the feed box 2. The feed box 2 has a discharge port 20 on its lower surface and the lower end of the feed box 2 is inclined.

[0051] The striking blocks 19 are evenly distributed on the surface of the movable plate 15, and the movable plate 15 is rotatably connected to the ball bearings 22. The surface of the ball bearings 22 is in contact with the surface of the limiting rod 17, and the cross section of the limiting rod 17 is considered to be an inverted "L" structure.

[0052] The surface of the connecting shaft 12 is concave, and protrusions 24 are fixedly installed on both the upper and lower sides of the connecting shaft 12. The part of the transition shaft 23 located inside the fixing plate 11 is protruding. A torsion spring 21 that plays an elastic reset role is fixedly installed on the surface of the protrusion 24, and the other side of the torsion spring 21 is fixedly connected to the inner wall of the fixing plate 11.

[0053] As the scraper 9 moves downward, it drives the connecting shaft 12 to rotate on the surface of the fixed plate 11 via the traction rope 10. The transition shaft 23 maximizes the tension of the traction rope 10. When the connecting shaft 12 rotates, it drives the docking rod 13 to rotate synchronously. Consequently, the first magnet 14 intermittently approaches the second magnet 16. When the first magnet 14 approaches the second magnet 16, the movable plate 15 moves towards the feed box 2 under the action of mutual repulsive magnetic force. At this time, the connecting spring 18 is compressed. As the first magnet 14 continues to rotate and moves away from the second magnet 16, the movable plate 15... Under the action of the connecting spring 18, the plate 15 moves away from the feed box 2 and repeats the above process. Under the action of the limit rod 17, the movable plate 15 drives the striking blocks 19 to make reciprocating linear motion in the horizontal direction. The striking blocks 19, which are evenly distributed on the surface of the movable plate 15, will hit the outer wall of the feed box 2 repeatedly when making reciprocating linear motion, causing the feed box 2 to vibrate slightly as a whole. This allows the material to fall into the next working mechanism better, improving work efficiency and ultimately increasing the yield of high-quality products. The ball bearings 22 make the movable plate 15 move more smoothly.

[0054] When the connecting shaft 12 rotates, it drives the protrusion 24 to rotate synchronously. When the protrusion 24 rotates, it stretches the torsion spring 21. When the scraper 9 rises, the connecting shaft 12 loses the tension of the traction rope 10. At this time, the connecting shaft 12 rotates under the action of the torsion spring 21 and the protrusion 24. When the connecting shaft 12 rotates, the equally spaced striking blocks 19 will repeatedly make reciprocating linear motion in the horizontal direction, striking the outer wall of the feed box 2, further optimizing the feeding effect. At the same time, when the connecting shaft 12 rotates, it will rewind the traction rope 10 for easy use next time.

[0055] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0056] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and 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. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0058] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An injection molding machine that can improve the yield of high-quality products, comprising an equipment box (1) and a feed pipe (3), wherein a base is fixedly installed on the lower surface of the equipment box (1), a conveying mechanism is fixedly installed on the upper surface of the equipment box (1), a heating mechanism is fixedly installed on the upper surface of the equipment box (1), an extrusion molding mechanism is fixedly installed on the upper surface of the equipment box (1), and a feed box (2) is fixedly installed on the upper surface of the conveying mechanism; The feed pipe (3) is fixedly installed on the upper surface of the feed box (2), and the feed pipe (3) is fixedly connected to the output end of the external feeding device; Its features are, Also includes: Motor (4), the motor (4) is fixedly installed on the inner wall of the feed box (2), and a cam (5) is fixedly installed at the output end of the motor (4); Baffle (6), the baffle (6) is slidably disposed inside the feed box (2), and the top view of the baffle (6) is circular, and the upper surface of the baffle (6) in the front section is inclined, and a connecting rod (8) is fixedly installed on the lower surface of the baffle (6). Scraper (9), the scraper (9) is fixedly installed at the end of the connecting rod (8); A fixing plate (11) is fixedly installed on the surface of the feed box (2), and a transition shaft (23) is rotatably connected to the surface of the fixing plate (11), and a connecting shaft (12) is rotatably connected to the surface of the fixing plate (11). Limiting rod (17), the limiting rod (17) is fixedly installed on the surface of the feed box (2), and a movable plate (15) is sleeved and connected to the surface of the limiting rod (17), and a knocking block (19) corresponding to the feed box (2) is fixedly installed on the surface of the movable plate (15). Door panel (25), which is hinged to the surface of the feed box (2).

2. The injection molding machine according to claim 1, characterized in that: The lower surface of the baffle (6) is in contact with the surface of the cam (5), and the length of the baffle (6) is greater than the diameter of the feed pipe (3).

3. The injection molding machine according to claim 1, characterized in that: A column (7) is fixedly installed on the inner wall of the feed box (2), and the column (7) penetrates the interior of the baffle (6). The columns (7) are symmetrically distributed about the center of the baffle (6), and the cross section of the column (7) is considered to be an inverted "T" shape.

4. The injection molding machine according to claim 1, characterized in that: The surface of the scraper (9) is inclined, and the inner side of the scraper (9) is in contact with the inner wall of the feed box (2), and the scraper (9) is symmetrically distributed about the center of the feed box (2).

5. The injection molding machine according to claim 1, characterized in that: The inner surface of the scraper (9) is fixedly mounted with a traction rope (10), and the other side of the traction rope (10) is wound and fixedly connected to the surface of the connecting shaft (12). The surface of the connecting shaft (12) is fixedly mounted with a docking rod (13), and the traction rope (10) is attached to the surface of the transition shaft (23).

6. The injection molding machine according to claim 5, characterized in that: A first magnet (14) is fixedly installed at the end of the docking rod (13), and a second magnet (16) corresponding to the first magnet (14) is fixedly installed on the side of the movable plate (15), and the magnetic poles on the surface of the second magnet (16) are the same as the magnetic poles at the end of the first magnet (14).

7. The injection molding machine according to claim 1, characterized in that: The surface of the movable plate (15) is fixedly installed with a connecting spring (18) that plays an elastic reset role, and the other side of the connecting spring (18) is fixedly connected to the outer wall of the feed box (2). The lower surface of the feed box (2) is provided with a feeding port (20), and the lower end of the feed box (2) is inclined.

8. The injection molding machine according to claim 1, characterized in that: The striking blocks (19) are evenly distributed on the surface of the movable plate (15), and the movable plate (15) is rotatably connected with balls (22), and the surface of the balls (22) is in contact with the surface of the limiting rod (17), and the cross section of the limiting rod (17) is considered to be an inverted "L" structure.

9. The injection molding machine according to claim 1, characterized in that: The surface of the connecting shaft (12) is concave, and protrusions (24) are fixedly installed on both the upper and lower sides of the connecting shaft (12). The part of the transition shaft (23) located inside the fixing plate (11) is protruding.

10. An injection molding machine for improving the yield of high-quality products according to claim 9, characterized in that: A torsion spring (21) that provides elastic reset is fixedly installed on the surface of the protrusion (24), and the other side of the torsion spring (21) is fixedly connected to the inner wall of the fixing plate (11).

Images