Highly reliable coating apparatus

Abstract

The application discloses a high-reliability coating device, a storage box arranged in parallel to a coating roller is fixedly connected with a lifting plate through a mounting frame, the upper end of the mounting frame is elastically connected with the storage box, and the lower end of the mounting frame is fixedly connected with a roller frame; the upper end of a hollow brush head is in communication with the inside of the storage box, an opening is arranged on the side wall of the lower end of the hollow brush head, the opening is closed when the hollow brush head is in a vertical state, and the opening is opened when the lower end of the hollow brush head is bent; a fixing frame is arranged on the outer wall of the storage box, the fixing frame is rotationally connected with a sleeve through a connecting rod, a first connecting frame fixedly connected with the mounting frame is arranged above the sleeve, a rotating disc with a rotating shaft is rotationally arranged on the first connecting frame, a damping mechanism is arranged between the rotating shaft and the first connecting frame, and a plurality of expansion arc blocks are arranged on the circumference of the rotating disc. The high-reliability coating device effectively avoids the situation that the sealing plate is continuously opened when the driving motor is stopped, and reduces the waste of coating agent.

Description

Technical Field

[0001] This invention relates to the field of coating apparatus technology, and more particularly to a high-reliability coating apparatus. Background Technology

[0002] Coating equipment is a method of preparing composite materials (films) by coating paste polymers, molten polymers or polymer melts onto paper, cloth or plastic films. Currently, coating roller coating equipment is a commonly used coating method.

[0003] A search revealed Chinese patent publication number CN211420720U, which discloses a high-speed roller coater. The device includes a base plate with supports positioned front and rear on the upper left side of the base plate. Anti-slip devices are provided on the upper surfaces of the supports. A stepper motor is located at the front left end of the coater housing. A recovery tank is located in the middle of the lower surface of the base plate, with a water pump at the bottom right of the recovery tank. Coating rollers are located on the left side of the coater housing. A slurry tank is located on the upper left side of the coater housing, with a pressure pump at the bottom left of the slurry tank. A solenoid valve is located below the slurry tank, with a connecting pipe at its lower end. From left to right, nozzles are arranged along the lower end of the connecting pipe, and a collection trough is located below the nozzles. The collection trough is connected to the recovery tank via a pipe. This device enables the recovery of excess slurry, effectively improving work efficiency and speed.

[0004] The above-mentioned device applies pressure through a pressure pump and controls the amount of coating liquid through a solenoid valve, thereby enabling the nozzle to coat quickly. However, when using the above-mentioned device for production, there is a problem that the coating agent is not evenly distributed on the surface of the coating roller, which affects the coating effect. Summary of the Invention

[0005] The purpose of this invention is to provide a high-reliability coating device that enables the periodic release of the coating agent, effectively avoiding excessive release in a single step, promoting uniform coating, improving the consistency of coating thickness, and enhancing the overall coating effect.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a high-reliability coating device, comprising: a device body, a roller frame on which a coating roller is rotatably mounted is provided above the device body, a first mounting frame on one side of the roller frame and on the top of the device body is provided with a lifting plate internally connected, a storage box for storing coating agent is provided above the coating roller, and the storage box, which is parallel to the coating roller, is fixedly connected to the lifting plate through a mounting frame, and the upper end of the mounting frame is elastically connected to the storage box, and its lower end is fixedly connected to the roller frame; Several hollow brush heads are arranged at the bottom of the storage box along its length, and the upper end of the hollow brush head is connected to the interior of the storage box. An opening is provided on the side wall at the lower end of the hollow brush head. When the hollow brush head is in a vertical state, the opening is kept closed. When the lower end of the hollow brush head is bent, the opening is opened. The outer wall of the storage box is provided with a fixed frame, and the fixed frame is rotatably connected to a sleeve through a connecting rod. Above the sleeve is a first connecting frame fixedly connected to the mounting frame. A turntable with a rotating shaft is rotatably mounted on the first connecting frame, and a damping mechanism is provided between the rotating shaft and the first connecting frame. Several expanding arc blocks are arranged at intervals along the circumference of the turntable. The expanding arc blocks are elastically connected to the turntable through a spring rod. A rotating cylinder is provided on one side of the turntable. Several actuating rods with actuating wheels are arranged at the end of the rotating cylinder near the turntable and along the circumference of that end. A driving mechanism for driving the actuating rods to rotate around the shaft is connected to the rotating cylinder. When the actuating wheel rolls along the expanding arc block, the expanding arc block moves radially along the turntable. This impacts the sleeve, causing the storage box to move downwards. The actuating lever, while rotating, needs to overcome the resistance of the rotating disc. This allows for both relative rotation between the actuating lever and the rotating disc, and also enables the actuating lever to drive the rotating disc, thus causing the amplification arc block to periodically contact the sleeve, resulting in intermittent contact between the hollow brush head at the bottom of the storage box and the coating roller. When the hollow brush head comes into contact with the coating roller, the rotating coating roller will cause the bottom of the hollow brush head to bend, thereby expanding the opening of the hollow brush head and periodically releasing the coating agent inside the storage tank onto the coating roller. When the hollow brush head comes into contact with the coating roller, the rotating coating roller will cause the bottom of the hollow brush head to bend, thereby expanding the opening of the hollow brush head and periodically releasing the coating agent inside the storage box onto the coating roller. The coating agent is replenished onto the coating roller in a timely manner, which effectively avoids the situation of excessive release in a single time. It also helps to coat evenly along the length of the film, improves the consistency of coating thickness, and enhances the overall coating effect. By setting a damping structure between the rotating shaft of the turntable and the first connecting frame, the actuating rod needs to overcome the resistance of the turntable's rotation while rotating. This allows for relative rotation between the actuating rod and the turntable, as well as the actuating rod driving the turntable to rotate. This enables the amplification arc block to periodically contact the sleeve. Furthermore, the rotation of the actuating rod causes the actuating wheel to roll along the inner wall of the arc block, and the amplification arc block moves radially along the turntable, thereby impacting the sleeve and causing the storage box to move downwards. This results in intermittent contact between the hollow brush head at the bottom of the storage box and the coating roller.

[0007] The following are further improvements to the above technical solution: 1. In the above scheme, the distance between the expanding arc block and the turntable gradually decreases along the rotation trajectory of the lever, so that the expanding arc block has a far end and a near end relative to the turntable, and the initial position of the lever is adapted to the far end of the expanding arc block.

[0008] 2. In the above scheme, the opening includes a transverse cut, which is distributed in a ring along the circumference of the hollow brush head.

[0009] 3. In the above scheme, the opening also includes a vertical cut, which is set along the length direction of the hollow brush head, and the vertical cut and the horizontal cut are arranged in a cross shape.

[0010] 4. In the above scheme, the damping mechanism includes a rotating wheel with teeth on the outer wall and a movable locking member. The rotating wheel is sleeved on the circumferential outer wall of the rotating shaft. One end of the movable locking member can penetrate the side wall of the first connecting frame and cooperate with the teeth. The other end is provided with a second spring between it and the outer wall of the first connecting frame. When the movable locking member is engaged with the teeth, the second spring is in a contracted state.

[0011] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: 1. The high-reliability coating device of the present invention has an upper end of the mounting frame elastically connected to the storage box and a lower end fixedly connected to the roller frame. By setting a damping structure between the rotating shaft of the turntable and the first connecting frame, the actuating rod needs to overcome the resistance of the turntable's rotation while rotating. This allows for both relative rotation between the actuating rod and the turntable, and also allows the actuating rod to drive the turntable to rotate, thereby enabling the amplification arc block to periodically contact the sleeve. Furthermore, the rotation of the actuating rod causes the actuating wheel to roll along the inner wall of the arc block, and the amplification arc block moves radially along the turntable. The movement causes the impact sleeve to move the storage box downwards, resulting in intermittent contact between the hollow brush head at the bottom of the storage box and the coating roller. When the hollow brush head contacts the coating roller, the rotating coating roller causes the bottom of the hollow brush head to bend, thereby expanding the opening of the hollow brush head and periodically releasing the coating agent inside the storage box onto the coating roller. This timely replenishment of the coating agent onto the coating roller effectively avoids excessive release in a single step, and also facilitates uniform coating along the length of the film, improving the consistency of the coating thickness and enhancing the overall coating effect.

[0012] 2. The high-reliability coating device of the present invention has a rotating rod detachably installed inside the rotating drum. A side bracket with a drive motor is provided on one side of the first connecting frame. The rotating rod, which is fixedly connected to the output shaft of the drive motor, is rotatably mounted on the side bracket. An installation hole is opened on the outer wall of the rotating drum. The movable end of a locking cylinder can pass through the installation hole and connect to the rotating rod. This locking cylinder is fixedly mounted on the outer wall of the rotating drum by a mounting seat. A spring is provided between the other end of the rotating drum and the outer wall of the rotating rod. When the rotating rod stops, the movable end of the locking cylinder can be controlled to be pulled out of the installation hole. Under the action of the spring, the rotating drum and the rotating rod rotate relative to each other, which effectively avoids the situation where the sealing plate continues to open when the drive motor stops, reduces the waste of coating agent, and improves the overall reliability of the device. Attached Figure Description

[0013] Appendix Figure 1 This is a schematic diagram of the high-reliability coating device of the present invention; Appendix Figure 2 This is a partial structural diagram of the high-reliability coating device of the present invention. Figure 1 ; Appendix Figure 3 This is a partial structural diagram of the high-reliability coating device of the present invention. Figure 2 ; Appendix Figure 4 This is a partial structural diagram of the high-reliability coating device of the present invention. Figure 3 ; Appendix Figure 5 This is a partial structural diagram of the storage box in the high-reliability coating device of the present invention; Appendix Figure 6 Appendix to this invention Figure 5 Enlarged view of point A; Appendix Figure 7 This is a first-view structural schematic diagram of the drive mechanism in the high-reliability coating device of the present invention; Appendix Figure 8 This is a second-view structural schematic diagram of the drive mechanism in the high-reliability coating device of the present invention; Appendix Figure 9 This is a schematic diagram of the damping mechanism in the high-reliability coating device of the present invention.

[0014] In the above attached figures: 1. Device body; 2. Coating roller; 3. Feed roller; 4. Second mounting frame; 5. First mounting frame; 6. Lifting adjustment motor; 7. Mounting hole; 8. Storage box; 9. First spring; 10. Side bracket; 11. Drive motor; 12. Expanding arc block; 13. Coating motor; 14. Fixing frame; 15. Lifting guide rod; 16. Hollow brush head; 17. Roller frame; 18. Actuating wheel; 19. Connecting rod; 20. Sleeve; 21. Opening ; 211. Horizontal cut; 212. Vertical cut; 22. Rotary wheel; 23. Spring rod; 24. Turntable; 25. Actuating rod; 26. Locking cylinder; 27. Mounting base; 28. Spring spring; 29. ​​Rotating rod; 30. Rotary cylinder; 31. Second spring; 32. Movable locking component; 33. Horizontal guide rod; 34. Convex tooth; 35. Screw; 36. Guide slide rod; 37. Lifting plate; 38. Mounting bracket; 39. Sliding seat; 40. First connecting bracket. Detailed Implementation

[0015] The present patent can be further understood through the specific embodiments given below, but they are not intended to limit the present patent.

[0016] Example: A high-reliability coating device includes: a device body 1, a roller frame 17 on which a coating roller 2 is rotatably mounted is provided above the device body 1, a first mounting frame 5 on one side of the roller frame 17 and on the top of the device body 1 is provided with a lifting plate 37 internally movably connected, a storage box 8 for storing coating agent is provided above the coating roller 2, and the storage box 8, which is parallel to the coating roller 2, is fixedly connected to the lifting plate 37 by a mounting frame 38, and the upper end of the mounting frame 38 is elastically connected to the storage box 8, and its lower end is fixedly connected to the roller frame 17; A plurality of hollow brush heads 16 are provided at the bottom of the storage box 8 along its length, and the upper end of the hollow brush head 16 is connected to the interior of the storage box 8. An opening 21 is provided on the side wall at the lower end of the hollow brush head 16. When the hollow brush head 16 is in a vertical state, the opening 21 remains closed. When the lower end of the hollow brush head 16 is bent, the opening 21 is opened. When the hollow brush head comes into contact with the coating roller, the rotating coating roller will cause the bottom of the hollow brush head to bend, thereby expanding the opening of the hollow brush head and periodically releasing the coating agent inside the storage box onto the coating roller. The coating agent is replenished onto the coating roller in a timely manner, which effectively avoids the situation of excessive release in a single time. It also helps to coat evenly along the length of the film, improves the consistency of coating thickness, and enhances the overall coating effect. A fixed frame 14 is provided on the outer wall of the storage box 8, and a sleeve 20 is rotatably connected to the fixed frame 14 via a connecting rod 19. A first connecting frame 40 is provided above the sleeve 20 and is fixedly connected to the mounting frame 38. A turntable 24 with a rotating shaft 241 is rotatably mounted on the first connecting frame 40, and a damping mechanism is provided between the rotating shaft 241 and the first connecting frame 40. Several expanding arc blocks 12 are arranged at intervals along the circumference of the turntable 24. The expanding arc blocks 12 are elastically connected to the turntable 24 via a spring rod 23. A rotating cylinder 30 is provided on one side of the turntable 24. Several actuating rods 25 with actuating wheels 18 are arranged at one end of the rotating cylinder 30 near the turntable 24 and along the circumference of that end. A driving mechanism for driving the actuating rods 25 to rotate around the axis is connected to the rotating cylinder 30. When the actuating wheel 18 rolls along the expanding arc block 12, the expanding arc block 12 moves radially along the turntable 24. By setting a damping structure between the rotating shaft of the turntable and the first connecting frame, the actuating rod needs to overcome the resistance of the turntable's rotation while rotating. This allows for relative rotation between the actuating rod and the turntable, as well as the actuating rod driving the turntable to rotate. This enables the amplification arc block to periodically contact the sleeve. Furthermore, the rotation of the actuating rod causes the actuating wheel to roll along the inner wall of the arc block, and the amplification arc block moves radially along the turntable, thereby impacting the sleeve and causing the storage box to move downwards. This results in intermittent contact between the hollow brush head at the bottom of the storage box and the coating roller.

[0017] The aforementioned drive mechanism includes: a drive motor 11 and a rotating rod 29. The rotating rod 29 is detachably installed inside the aforementioned rotating drum 30. A side bracket 10 on one side of the aforementioned first connecting frame 40 is provided, on which the drive motor 11 is installed. The aforementioned rotating rod 29, which is fixedly connected to the output shaft of the drive motor 11, is rotatably installed on the aforementioned side bracket 10.

[0018] A mounting hole 7 is provided on the outer wall of the aforementioned rotating drum 30. The movable end of a locking cylinder 26 can pass through the mounting hole 7 and be connected to the rotating rod 29. The locking cylinder 26 is fixedly mounted on the outer wall of the rotating drum 30 by a mounting base 27, and a spring spring 28 is provided between the other end of the aforementioned rotating drum 30 and the outer wall of the rotating rod 29. By setting up structures such as a rotating drum, a rotating rod, and a spring, when the rotation drive motor stops working, the electric locking cylinder is controlled to unlock, allowing the rotating drum to rotate on the outer wall of the rotating rod. At this time, the actuating wheel is in a movable state, and under the influence of the force of the spring inside the actuating rod, the expansion arc block can be reset.

[0019] The damping mechanism includes a rotating wheel 22 with teeth 34 on its outer wall and a movable locking member 32. The rotating wheel 22 is sleeved on the circumferential outer wall of the rotating shaft 241. One end of the movable locking member 32 can penetrate the side wall of the first connecting frame 40 and cooperate with the teeth 34. The other end is provided with a second spring 31 between it and the outer wall of the first connecting frame 40. When the movable locking member 32 is engaged with the teeth 34, the second spring 31 is in a contracted state. By incorporating structures such as protruding teeth and movable locking parts, the end of the movable locking part can remain in contact with the protruding teeth under the force applied by the second spring, thereby hindering the rotation of the wheel to a certain extent and providing sufficient resistance.

[0020] A transverse guide rod 33 is fixedly installed below the aforementioned movable clip 32 and on the outer wall of the aforementioned first connecting frame 40, and the aforementioned movable clip 32 and the transverse guide rod 33 are slidably connected.

[0021] When the aforementioned lever 25 rotates, causing the lever 18 to roll from the far end to the near end on the surface of the expanding arc block 12, it overcomes the resistance between the rotating wheel 22 and the first connecting frame 40, thereby driving the turntable 24 to rotate on the first connecting frame 40.

[0022] The opening 21 includes a transverse cut 211, which is distributed in a ring along the circumference of the hollow brush head 16.

[0023] The opening 21 also includes a vertical cut 212, which is set along the length of the hollow brush head 16, and the vertical cut 212 and the horizontal cut 211 are arranged in a cross shape.

[0024] A coating motor 13 for driving the coating roller 2 to rotate is fixedly installed on the outer wall of the roller frame 17.

[0025] A second mounting frame 4, in which a feed roller 3 is installed, is provided on the other side of the roller frame 17.

[0026] The working principle is as follows: In use, pass one end of the film between the two feed rollers, then pass it under the coating roller. Start the coating motor to drive the coating roller to rotate. The rotating coating roller moves the film. Start the lifting and adjusting motor to drive the adjusting screw to rotate. The storage box is raised and lowered through the mounting frame, thereby adjusting the height of the hollow brush head. The drive motor is started to rotate the rotating rod, which in turn rotates the actuating rod, causing the actuating wheel to roll from the far end to the near end on the surface of the expanding arc block. Since the size of the actuating rod is fixed, as the actuating wheel rolls from the far end to the near end on the surface of the expanding arc block, the spring rod can extend outward with the help of the deformation of the internal spring, thereby increasing the distance between the expanding arc block and the turntable. When the internal spring of the spring rod deforms to a certain extent, the corresponding force increases to a certain extent, thereby overcoming the resistance between the rotating wheel and the first connecting frame and driving the turntable to rotate. At this time, the rotation radius of the expanding arc block is relatively larger, so that when the expanding arc block rotates, it can contact the connecting rod and squeeze the connecting rod downward. The fixed frame drives the storage box and the hollow brush head to move down. When the hollow brush head contacts the coating roller, the hollow brush head bends and deforms, thereby causing the opening to expand. The coating agent can be output from the horizontal cut and the vertical cut to the surface of the coating roller. With the continuous rotation of the coating roller, it can ensure that the coating agent is distributed more evenly on the coating roller. By setting up structures such as protruding teeth and movable locking parts, the end of the movable locking part can be kept in contact with the protruding teeth under the force applied by the second spring, thereby hindering the rotation of the wheel to a certain extent and providing sufficient resistance. By setting up structures such as a rotating drum, a rotating rod, and a spring, when the rotation drive motor stops working, the electric locking cylinder is controlled to unlock, allowing the rotating drum to rotate on the outer wall of the rotating rod. At this time, the actuating wheel is in a movable state, and under the influence of the force of the spring inside the actuating rod, the expansion arc block can be reset.

[0027] When using the aforementioned high-reliability coating device, it can achieve relative rotation between the actuating rod and the turntable, and also enable the actuating rod to drive the turntable to rotate, thereby causing the amplification arc block to periodically contact the sleeve. This results in intermittent contact between the hollow brush head at the bottom of the storage tank and the coating roller. When the hollow brush head contacts the coating roller, the rotating coating roller causes the bottom of the hollow brush head to bend, thus expanding the opening of the hollow brush head and periodically releasing the coating agent inside the storage tank onto the coating roller. This timely replenishment of the coating agent onto the coating roller effectively avoids excessive single release and promotes uniform coating along the length of the film, improving the consistency of the coating thickness and enhancing the overall coating effect. When the rotating rod stops, the movable end of the locking cylinder can be controlled to be pulled out of the mounting hole, and under the action of the spring, the drum and the rotating rod rotate relative to each other, effectively preventing the sealing plate from continuously opening when the drive motor stops, reducing coating agent waste, and improving the overall reliability of the device.

[0028] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A high-reliability coating device, comprising: The device body (1) is provided with a roller frame (17) on which the coating roller (2) is rotatably mounted. The device body (1) is characterized in that: a first mounting frame (5) with a lifting plate (37) internally movably connected is provided on one side of the roller frame (17) and on the top of the device body (1). A storage box (8) for storing coating agent is provided above the coating roller (2). The storage box (8) is parallel to the coating roller (2) and is fixedly connected to the lifting plate (37) by a mounting frame (38). The upper end of the mounting frame (38) is elastically connected to the storage box (8), and its lower end is fixedly connected to the roller frame (17). A plurality of hollow brush heads (16) are provided at the bottom of the storage box (8) along its length, and the upper end of the hollow brush head (16) is connected to the interior of the storage box (8). An opening (21) is provided on the side wall at the lower end of the hollow brush head (16). When the hollow brush head (16) is in a vertical state, the opening (21) remains closed. When the lower end of the hollow brush head (16) is bent, the opening (21) is opened. The outer wall of the storage box (8) is provided with a fixed frame (14), and the fixed frame (14) is rotatably connected to a sleeve (20) via a connecting rod (19). Above the sleeve (20) is a first connecting frame (40) fixedly connected to the mounting frame (38). A turntable (24) with a rotating shaft (241) is rotatably mounted on the first connecting frame (40), and a damping mechanism is provided between the rotating shaft (241) and the first connecting frame (40). Several expanding arc blocks are arranged at intervals along the circumference of the turntable (24). 12) This expansion arc block (12) is elastically connected to the turntable (24) via a spring rod (23). A rotating cylinder (30) is provided on one side of the turntable (24). A plurality of levers (25) with levers (18) are provided at one end of the rotating cylinder (30) near the turntable (24) and along the circumference of that end. A drive mechanism for driving the levers (25) to rotate around an axis is connected to the rotating cylinder (30). When the levers (18) roll along the expansion arc block (12), the expansion arc block (12) moves radially along the turntable (24). This impacts the sleeve, causing the storage box to move downwards. The actuating lever, while rotating, needs to overcome the resistance of the rotating disc. This allows for both relative rotation between the actuating lever and the rotating disc, and also enables the actuating lever to drive the rotating disc, thus causing the amplification arc block to periodically contact the sleeve, resulting in intermittent contact between the hollow brush head at the bottom of the storage box and the coating roller. When the hollow brush head comes into contact with the coating roller, the rotating coating roller will cause the bottom of the hollow brush head to bend, thereby expanding the opening of the hollow brush head and periodically releasing the coating agent inside the storage tank onto the coating roller. When the hollow brush head comes into contact with the coating roller, the rotating coating roller will cause the bottom of the hollow brush head to bend, thereby expanding the opening of the hollow brush head and periodically releasing the coating agent inside the storage box onto the coating roller. The coating agent is replenished onto the coating roller in a timely manner, which effectively avoids the situation of excessive release in a single time. It also helps to coat evenly along the length of the film, improves the consistency of coating thickness, and enhances the overall coating effect. By setting a damping structure between the rotating shaft of the turntable and the first connecting frame, the actuating rod needs to overcome the resistance of the turntable's rotation while rotating. This allows for relative rotation between the actuating rod and the turntable, as well as the actuating rod driving the turntable to rotate. This enables the amplification arc block to periodically contact the sleeve. Furthermore, the rotation of the actuating rod causes the actuating wheel to roll along the inner wall of the arc block, and the amplification arc block moves radially along the turntable, thereby impacting the sleeve and causing the storage box to move downwards. This results in intermittent contact between the hollow brush head at the bottom of the storage box and the coating roller.

2. The high-reliability coating device according to claim 1, characterized in that: The distance between the expanding arc block (12) and the turntable (24) gradually decreases along the rotation trajectory of the lever (25), so that the expanding arc block (12) has a far end and a near end relative to the turntable (24), and the initial position of the lever (18) is adapted to the far end of the expanding arc block (12).

3. The high-reliability coating device according to claim 1, characterized in that: The opening (21) includes a transverse cut (211) which is distributed in a ring along the circumference of the hollow brush head (16).

4. The high-reliability coating device according to claim 3, characterized in that: The opening (21) also includes a vertical cut (212), which is set along the length of the hollow brush head (16), and the vertical cut (212) and the horizontal cut (211) are arranged in a cross shape.

5. The high-reliability coating device according to claim 1, characterized in that: The damping mechanism includes a rotating wheel (22) with protruding teeth (34) on its outer wall and a movable locking member (32). The rotating wheel (22) is sleeved on the circumferential outer wall of the rotating shaft (241). One end of the movable locking member (32) can penetrate the side wall of the first connecting frame (40) and cooperate with the protruding teeth (34). The other end is provided with a second spring (31) between it and the outer wall of the first connecting frame (40). When the movable locking member (32) is engaged with the protruding teeth (34), the second spring (31) is in a contracted state.

Images