Recovery device suitable for filtering and circulating chemicals

Abstract

The utility model relates to the technical field of chemical filtering, and discloses a recovery device suitable for chemical filtering circulation, which comprises a filter cartridge, two connecting blocks are fixedly connected to the middle of the front side of the filter cartridge, an arc-shaped plate is slidably connected to the inner wall of the filter cartridge, a plurality of filter element nets are fixedly connected to the inside of the arc-shaped plate, and the filter element nets are fixedly connected to the inner side of the arc-shaped plate. A sliding column is slidably connected to the inner wall of the arc-shaped plate, a connecting plate is fixedly connected to the rear side of the sliding column, fixing plates are fixedly connected to the left end and the right end of the connecting plate correspondingly, supporting assemblies for supporting are fixedly connected to the inner walls of the left end and the right end of the arc-shaped plate correspondingly, and springs are fixedly connected to the sides, away from each other, of the two supporting assemblies correspondingly. According to the utility model, a force in a reverse direction is applied to the sliding block for resetting, and the sliding block slides away from the interior of the connecting block in the sliding process, so that the arc-shaped plate can be taken down to clean the filter element net, and the replacement and cleaning efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of chemical filtration technology, and in particular to a recovery device suitable for chemical filtration recycling. Background Technology

[0002] Chemicals refer to pure substances and mixtures composed of various elements, including natural and man-made compounds. These chemicals play an important role in human life, production, and the environment. However, with the increasing use of chemicals, their potential harm to the environment and human health is becoming increasingly prominent. Therefore, chemical filtration and recycling systems have emerged to reduce pollution, protect the environment, and achieve sustainable resource utilization.

[0003] In chemical production, mixed solutions first pass through filters, where large particles and macromolecular organic matter are removed by filter screens or membranes of varying precision. Next, they enter an adsorption unit, where activated carbon or ion exchange resins adsorb organic pollutants, odor substances, and ionic impurities. Then, they reach a distillation unit, where the solvent is heated and vaporized, then condensed and purified, achieving separation from high-boiling-point impurities. Throughout the process, any unretained or newly generated impurities can be recycled back to the filter for further filtration, improving chemical recovery rates and purity.

[0004] In existing technologies, some recovery devices suitable for chemical filtration cycles require tools and bolts for cleaning the filter screen or membrane, and time is spent on disassembling and installing the bolts. This increases operational steps and time costs. With frequent filter screen or membrane cleaning, this extra time accumulates, lengthening the overall equipment maintenance cycle and reducing work efficiency. Therefore, to address these shortcomings, a recovery device suitable for chemical filtration cycles is proposed to solve the aforementioned problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a recovery device suitable for chemical filtration cycles, aiming to improve the problem that some existing recovery devices suitable for chemical filtration cycles have reduced replacement efficiency during use because tools and bolts are required to replace the filter screen or filter membrane.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A recovery device suitable for chemical filtration and recycling includes a filter cartridge. Two connecting blocks are fixedly connected to the middle of the front side of the filter cartridge. An arc-shaped plate is slidably connected to the inner wall of the filter cartridge. Multiple filter screens are fixedly connected inside the arc-shaped plate. A sliding column is slidably connected to the inner wall of the arc-shaped plate. A connecting plate is fixedly connected to the rear side of the sliding column. Fixed plates are fixedly connected to both ends of the connecting plate. Support components for providing support are fixedly connected to the inner walls of both ends of the arc-shaped plate. Springs are fixedly connected to the opposite sides of the two support components. A sliding block is slidably connected to the outside of the support component. An inclined opening is provided inside the sliding block. A flow-guiding component for introducing chemicals is fixedly connected to the top side of the filter cartridge. A circulation component for recycling chemicals is fixedly connected to the right end of the filter cartridge.

[0008] As a further description of the above technical solution:

[0009] A protective box is fixedly connected to the left side of the filter cartridge. A power assembly providing a drive source is fixedly connected inside the protective box. A transmission column is fixedly connected to the left side of the power assembly. A concave plate is slidably connected to the outside of the transmission column. A piston rod is fixedly connected to the top side of the concave plate. A piston plate is fixedly connected to the top side of the piston rod. A side plate is fixedly connected to the top left side of the filter cartridge. A piston cylinder is fixedly connected inside the side plate.

[0010] As a further description of the above technical solution:

[0011] An opening plate is fixedly connected to the left side of the filter cylinder, and a right-angle plate is rotatably connected inside the opening plate. A positioning block is fixedly connected to the left side of the filter cylinder, and one of the rings is fixedly connected to the left end of the positioning block. A torsion spring is sleeved on the outside of one of the rings, and another ring is fixedly connected to the bottom side of the right-angle plate.

[0012] As a further description of the above technical solution:

[0013] The flow-guiding assembly includes a right-angle tube, the bottom end of which is fixedly connected to the top end of the filter cylinder. One of the one-way valves is fixedly connected to the left side of the right-angle tube. A connecting pipe is fixedly connected to the left end of one of the one-way valves. Another one-way valve is fixedly connected to the left end of the connecting pipe. A feed pipe is fixedly connected to the left end of the other one-way valve.

[0014] As a further description of the above technical solution:

[0015] The circulation assembly includes a discharge pipe, the left end of which is fixedly connected to the bottom right end of the filter cylinder, a storage cylinder fixedly connected to the right end of the discharge pipe, a circulation pump fixedly connected to the top end of the storage cylinder, a return pipe fixedly connected to the output end of the circulation pump, an extraction pipe fixedly connected to the input end of the circulation pump, a recovery pipe fixedly connected to the bottom right end of the storage cylinder, and the left end of the return pipe fixedly connected to the top right end of the filter cylinder.

[0016] As a further description of the above technical solution:

[0017] The power assembly includes a motor, which is externally fixedly connected to the inside of the protective box. A rotating shaft is fixedly connected to the drive end of the motor. A rotating plate is fixedly connected to the left side of the rotating shaft, and a transmission column is fixedly connected to the left side of the rotating plate.

[0018] As a further description of the above technical solution:

[0019] The piston plate is slidably connected to the inner wall of the piston cylinder, the top end of the piston cylinder is fixedly connected to the inside of the connecting pipe, the right side of the right angle plate is in contact with the top left side of the filter cylinder, and the other ring is sleeved on the left end of the torsion spring.

[0020] As a further description of the above technical solution:

[0021] Both of the support components include positioning rods. The adjacent sides of the two positioning rods are fixedly connected to the inner walls of the left and right ends of the arc-shaped plate, respectively. The distant sides of the two positioning rods are fixedly connected to limiting discs. The outer side of the limiting discs is slidably connected to the inside of the sliding block. The distant ends of the two limiting discs are fixedly connected to the adjacent ends of the two springs, respectively. The outer side of the fixing plate is slidably connected to the inside of the inclined opening, and the outer side of the sliding block is slidably connected to the inside of the connecting block.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, two sliding blocks slide towards each other and compress the spring, allowing the spring to extract its elastic potential energy. This, in turn, applies a force in the opposite direction to the sliding blocks to reset them. During the sliding process, the sliding blocks will slide away from the interior of the connecting block. At this point, the arc-shaped plate can be removed to clean the filter screen, thereby improving the efficiency of replacement and cleaning.

[0024] 2. In this utility model, by driving the concave plate to slide, the piston plate and the piston cylinder that are in contact with it will form a negative pressure. This allows the chemical inside the feed pipe to be drawn out by another one-way valve, and then pushed out into the right-angle tube through another one-way valve, and then flow into the filter cylinder, thereby achieving the effect of quantitative transportation of chemical. At the same time, another ring applies a force in the opposite direction to the right-angle plate to reset it and knock the filter cylinder, preventing the chemical from adhering to the inside of the filter cylinder. Attached Figure Description

[0025] Figure 1 This is a perspective view of the recovery device for chemical filtration and recycling proposed in this utility model;

[0026] Figure 2 This is a schematic diagram of the arc-shaped plate of the recovery device for chemical filtration and recycling proposed in this utility model;

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 This is a schematic diagram of the sliding column of the recovery device for chemical filtration and recycling proposed in this utility model;

[0029] Figure 5 for Figure 4 Enlarged view at point B in the middle;

[0030] Figure 6 This is a schematic diagram of the right-angled plate of the recovery device for chemical filtration and recycling proposed in this utility model;

[0031] Figure 7 This is a schematic diagram of the piston plate of the recovery device for chemical filtration and recycling proposed in this utility model;

[0032] Figure 8 for Figure 7 Enlarged view of point C in the middle.

[0033] Legend:

[0034] 1. Filter cartridge; 2. Connecting block; 3. Arc plate; 4. Filter screen; 5. Sliding column; 6. Connecting plate; 7. Fixing plate; 8. Positioning rod; 9. Limiting disc; 10. Sliding block; 11. Spring; 12. Inclined opening; 13. Right-angle tube; 14. One-way valve; 15. Connecting pipe; 16. Feed pipe; 17. Discharge pipe; 18. Accumulation cylinder; 19. Circulating pump; 20. Return pipe; 21. Extraction pipe; 22. Recovery pipe; 23. Protective box; 24. Motor; 25. Rotating shaft; 26. Rotating plate; 27. Transmission column; 28. Concave plate; 29. ​​Piston rod; 30. Piston plate; 31. Side plate; 32. Piston cylinder; 33. Opening plate; 34. Right-angle plate; 35. Positioning block; 36. Ring; 37. Torsion spring. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Reference Figures 1 to 3 This utility model provides an embodiment of a recovery device suitable for chemical filtration and circulation, comprising a filter cylinder 1, which provides space for the flow of chemicals. Two connecting blocks 2 are fixedly connected to the middle of the front side of the filter cylinder 1, secured by welding, thus providing stable support for the two connecting blocks 2. An arc-shaped plate 3 is slidably connected to the inner wall of the filter cylinder 1. The arc-shaped plate 3 is constrained by the filter cylinder 1, allowing it to slide stably and facilitating the replacement of filter elements 4 or internal cleaning and maintenance. Multiple filter elements 4 are fixedly connected inside the arc-shaped plate 3, used for efficiently filtering impurities in chemicals. A sliding column 5 is slidably connected to the inner wall of the arc-shaped plate 3, allowing it to slide stably. A connecting plate 6 is fixedly connected to the rear side of the sliding column 5, and pushing the sliding column 5 causes the connecting plate 6 to slide synchronously. Fixed plates 7 are fixedly connected to both ends of the connecting plate 6, transmitting the sliding force to the two fixed plates 7 through the connecting plate 6.

[0037] Reference Figure 2 , Figure 4 and Figure 5The inner walls of both ends of the arc-shaped plate 3 are fixedly connected to support components. Springs 11 are fixedly connected to the opposite sides of the two support components. Sliding blocks 10 are slidably connected to the outside of the support components. The sliding blocks 10 are slidably connected to the support components via slide rails. The support components provide force support to the springs 11 and sliding support to the sliding blocks 10. An inclined opening 12, which is trapezoidal, is provided inside the sliding block 10. Both support components include positioning rods 8. The adjacent sides of the two positioning rods 8 are fixedly connected to the inner walls of the left and right ends of the arc-shaped plate 3, and are fixed by welding, thus providing stable support for the two positioning rods 8. Limiting discs 9 are fixedly connected to the opposite sides of the two positioning rods 8, and are fixed by welding, forming a T-shape between the positioning rods 8 and the limiting discs 9. The limiting discs 9 are slidably connected to the inside of the sliding blocks 10, allowing the sliding blocks 10 to slide stably. The distal ends of the two limiting discs 9 are fixedly connected to the proximal ends of the two springs 11, respectively. The limiting discs 9 abut against the springs 11, allowing the springs 11 to be evenly stressed. The external part of the fixing plate 7 is slidably connected to the inside of the inclined opening 12, and the two fit tightly together, allowing the fixing plate 7 to slide stably within the inclined opening 12. The external part of the sliding block 10 is slidably connected to the inside of the connecting block 2, and the sliding block 10 slides into the inside of the connecting block 2 to form a locking mechanism. A flow-guiding assembly for introducing chemicals is fixedly connected to the top side of the filter cartridge 1, and the flow-guiding assembly guides the chemicals to flow smoothly into the filter cartridge 1.

[0038] Reference Figures 6 to 8 The flow-guiding assembly includes a right-angle tube 13, the bottom end of which is fixedly connected to the top of the filter cartridge 1 by welding, allowing the right-angle tube 13 to guide chemicals into the interior of the filter cartridge 1. A one-way valve 14 is fixedly connected to the left side of the right-angle tube 13, allowing the chemicals to flow from left to right. A connecting pipe 15 is fixedly connected to the left end of one of the one-way valves 14, ensuring unobstructed chemical transport. Another one-way valve 14 is fixedly connected to the left end of the connecting pipe 15, allowing the chemicals to slide from left to right. A feed pipe 16 is fixedly connected to the left end of the other one-way valve 14, used to connect to a chemical source. A circulation assembly for chemical circulation is fixedly connected to the right end of the filter cartridge 1, used to circulate the initially filtered chemicals. The circulation assembly includes a discharge pipe 17, which guides the initially filtered chemicals and restricts their flow through a valve. A accumulator 18 is fixedly connected to the right end of the discharge pipe 17. The accumulator 18 is used to store the chemicals that have undergone preliminary filtration. A circulation pump 19 is fixedly connected to the top end of the accumulator 18. The circulation pump 19 provides a power source for extracting chemicals. A return pipe 20 is fixedly connected to the output end of the circulation pump 19. The return pipe 20 returns the chemicals output by the circulation pump to the filter cartridge 1.

[0039] A suction pipe 21 is fixedly connected to the input end of the circulation pump 19. The suction pipe 21 is connected to the input end of the circulation pump 19 by welding or fittings, and draws chemicals from the accumulator 18 to provide the working medium for the circulation pump. A recovery pipe 22 is fixedly connected to the bottom right end of the accumulator 18. The recovery pipe 22 is used to discharge chemicals that have reached the recovery standard after multiple cycles. The left end of the return pipe 20 is fixedly connected to the top right end of the filter cartridge 1. The connection is firm, ensuring that the returned chemicals can smoothly enter the filter cartridge 1 to achieve circulation filtration. A protective box 23 is fixedly connected to the left side of the filter cartridge 1. It is fixed by welding, thereby providing stable support for the protective box 23. A power assembly that provides the drive source is fixedly connected inside the protective box 23. A transmission column 27 is fixedly connected to the left side of the power assembly. The power assembly includes a motor 24, which provides the drive source. A rotating shaft 25 is fixedly connected to the drive end of the motor 24. The rotating shaft 25 is driven to rotate by starting the motor 24.

[0040] A rotating plate 26 is fixedly connected to the left side of the rotating shaft 25, and the rotating plate 26 is driven to rotate synchronously by the rotating shaft 25. A transmission column 27 is fixedly connected to the left side of the rotating plate 26, and the rotating plate 26 transmits the rotational force to the transmission column 27. A concave plate 28 is slidably connected to the outside of the transmission column 27, and the transmission column 27 pushes the concave plate 28 to slide up and down reciprocally. A piston rod 29 is fixedly connected to the top side of the concave plate 28, and the sliding force is transmitted to the circulation pump 19 by the concave plate 28. A piston plate 30 is fixedly connected to the top side of the piston rod 29, and the piston rod 29 drives the piston plate 30 to slide up and down reciprocally, realizing the quantitative extraction and transportation of chemicals in the connecting pipe 15. A side plate 31 is fixedly connected to the top left side of the filter cartridge 1, and is fixed by welding to provide support for the side plate 31. A piston cylinder 32 is fixedly connected to the inside of the side plate 31, and is also fixed by welding to provide support for the piston cylinder 32. The piston plate 30 is externally slidably connected to the inner wall of the piston cylinder 32. The inner wall of the piston cylinder 32 is smooth and fits tightly with the piston plate 30, ensuring that the piston plate 30 slides smoothly in the piston cylinder 32, thereby realizing the extraction and transportation of chemicals.

[0041] The top end of the piston cylinder 32 is fixedly connected to the inside of the connecting pipe 15 by welding, thus providing stable support for the piston cylinder 32. An opening plate 33 is fixedly connected to the left side of the filter cylinder 1 by welding, thus providing stable support for the opening plate 33. A right-angle plate 34 is rotatably connected inside the opening plate 33. A pin inside the opening plate 33 restricts the right-angle plate 34, allowing it to rotate. The right side of the right-angle plate 34 contacts the top left side of the filter cylinder 1, striking the filter cylinder 1 to prevent chemicals from adhering to the inner wall. A positioning block 35 is fixedly connected to the left side of the filter cylinder 1 by welding, thus providing support for the positioning block 35. One of the rings 36 is fixedly connected to the left end of the positioning block 35 by welding, thus providing support for the ring 36. A torsion spring 37 is sleeved on the outside of one of the rings 36, providing a support pad for the tension of the torsion spring 37. Another ring 36 is fixedly connected to the bottom side of the right-angle plate 34. The other ring 36 stretches the torsion spring 37 during rotation. The outer part of the other ring 36 is fitted around the left end of the torsion spring 37 to ensure that the torsion spring 37 can effectively provide a restoring force for the right-angle plate 34.

[0042] Working principle: First, the chemicals are introduced through the feed pipe 16. Then, the motor 24 is started to drive the rotating shaft 25 to rotate, which in turn drives the rotating plate 26 to rotate. This drives the transmission column 27 to rotate, which in turn drives the concave plate 28 to slide up and down. This sliding motion causes the piston plate 30 to form a negative pressure with the piston cylinder 32, thereby using another one-way valve 14 to extract the chemicals from the feed pipe 16. The chemicals are then pushed out through another one-way valve 14 into the right-angle tube 13 and then into the filter cylinder 1, thus achieving the effect of quantitative chemical transport. At the same time, during the rotation of the rotating plate 26, it will intermittently press against the right-angle plate 34, allowing the right-angle plate 34 to rotate around the opening plate 33. This will drive another ring 36 to rotate and stretch the torsion spring 37, allowing the torsion spring 37 to release its elastic potential energy. Then, through the other ring 36, the right-angle plate 34 will be reset and struck the filter cylinder 1, preventing chemicals from adhering to the inside of the filter cylinder 1.

[0043] The chemicals then fall onto the filter screen 4 and filter it. When replacement is needed, the sliding column 5 is pushed, which in turn pushes the connecting plate 6 to slide, thereby pressing against the inside of the sliding block 10. The inclined opening 12 allows the two sliding blocks 10 to slide towards each other and compress the spring 11, allowing the spring 11 to release its elastic potential energy and then give the sliding block 10 a force in the opposite direction to reset it. During the sliding process, the sliding block 10 will slide away from the inside of the connecting block 2. At this time, the arc plate 3 can be removed to clean the filter screen 4, thereby improving the efficiency of replacement and cleaning. Conversely, the pushing force on the sliding column 5 will cause the spring 11 to reset and push the sliding block 10 to engage with the inside of the connecting block 2, thereby quickly completing the installation of the filter screen 4.

[0044] Then, by opening the valve on the discharge pipe 17, the chemicals initially filtered inside the filter cylinder 1 flow into the storage cylinder 18. Then, the circulation pump 19 is started to extract the initially filtered chemicals through the extraction pipe 21 and return them to the filter cylinder 1 through the return pipe 20, thereby achieving the effect of circulation filtration. Then, by opening the valve on the recovery pipe 22, the chemicals that have been filtered multiple times inside the storage cylinder 18 can be taken out.

[0045] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model 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 utility model should be included within the protection scope of the present utility model.

Claims

1. A recovery device suitable for chemical filtration recycling, comprising a filter cartridge (1), characterized in that: Two connecting blocks (2) are fixedly connected to the middle of the front side of the filter cylinder (1). An arc plate (3) is slidably connected to the inner wall of the filter cylinder (1). Multiple filter screens (4) are fixedly connected inside the arc plate (3). A sliding column (5) is slidably connected to the inner wall of the arc plate (3). A connecting plate (6) is fixedly connected to the rear side of the sliding column (5). Fixed plates (7) are fixedly connected to both the left and right ends of the connecting plate (6). Support components that provide support are fixedly connected to the inner walls of both the left and right ends of the arc plate (3). Springs (11) are fixedly connected to the opposite sides of the two support components. A sliding block (10) is slidably connected to the outside of the support component. An inclined opening (12) is opened inside the sliding block (10). A flow-guiding component for introducing chemicals is fixedly connected to the top side of the filter cylinder (1). A circulation component for chemical circulation is fixedly connected to the right end of the filter cylinder (1).

2. The recovery device for chemical filtration recycling according to claim 1, characterized in that: A protective box (23) is fixedly connected to the left side of the filter cylinder (1). A power assembly providing a driving source is fixedly connected inside the protective box (23). A transmission column (27) is fixedly connected to the left side of the power assembly. A concave plate (28) is slidably connected to the outside of the transmission column (27). A piston rod (29) is fixedly connected to the top side of the concave plate (28). A piston plate (30) is fixedly connected to the top side of the piston rod (29). A side plate (31) is fixedly connected to the top left side of the filter cylinder (1). A piston cylinder (32) is fixedly connected inside the side plate (31).

3. The recovery device for chemical filtration recycling according to claim 2, characterized in that: An opening plate (33) is fixedly connected to the left side of the filter cylinder (1). A right-angle plate (34) is rotatably connected inside the opening plate (33). A positioning block (35) is fixedly connected to the left side of the filter cylinder (1). One of the rings (36) is fixedly connected to the left end of the positioning block (35). A torsion spring (37) is sleeved on the outside of one of the rings (36). Another ring (36) is fixedly connected to the bottom side of the right-angle plate (34).

4. The recovery device for chemical filtration recycling according to claim 3, characterized in that: The drainage assembly includes a right-angle tube (13), the bottom end of which is fixedly connected to the top end of the filter cylinder (1). One of the one-way valves (14) is fixedly connected to the left side of the right-angle tube (13). A connecting pipe (15) is fixedly connected to the left end of one of the one-way valves (14). Another one-way valve (14) is fixedly connected to the left end of the connecting pipe (15). A feed pipe (16) is fixedly connected to the left end of the other one-way valve (14).

5. The recovery device for chemical filtration recycling according to claim 3, characterized in that: The circulation assembly includes a discharge pipe (17), the left end of which is fixedly connected to the bottom right end of the filter cylinder (1), the right end of which is fixedly connected to a storage cylinder (18), the top end of which is fixedly connected to a circulation pump (19), the output end of which is fixedly connected to a return pipe (20), the input end of which is fixedly connected to an extraction pipe (21), the bottom right end of which is fixedly connected to a recovery pipe (22), and the left end of which is fixedly connected to the top right end of the filter cylinder (1).

6. The recovery device for chemical filtration recycling according to claim 2, characterized in that: The power assembly includes a motor (24), which is externally fixedly connected to the inside of the protective box (23). A rotating shaft (25) is fixedly connected to the drive end of the motor (24). A rotating plate (26) is fixedly connected to the left side of the rotating shaft (25), and a transmission column (27) is fixedly connected to the left side of the rotating plate (26).

7. The recovery device for chemical filtration recycling according to claim 4, characterized in that: The piston plate (30) is slidably connected to the inner wall of the piston cylinder (32), the top end of the piston cylinder (32) is fixedly connected to the inside of the connecting pipe (15), the right side of the right angle plate (34) is in contact with the top left side of the filter cylinder (1), and the other ring (36) is sleeved on the left end of the torsion spring (37).

8. The recovery device for chemical filtration recycling according to claim 1, characterized in that: Both of the support components include positioning rods (8). The adjacent sides of the two positioning rods (8) are fixedly connected to the inner walls of the left and right ends of the arc plate (3). The distant sides of the two positioning rods (8) are fixedly connected to limiting discs (9). The outer side of the limiting discs (9) is slidably connected to the inside of the sliding block (10). The distant ends of the two limiting discs (9) are fixedly connected to the adjacent ends of the two springs (11). The outer side of the fixing plate (7) is slidably connected to the inside of the inclined opening (12). The outer side of the sliding block (10) is slidably connected to the inside of the connecting block (2).

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