Multilayer insulation panel structure for n2 gas heater

Abstract

The utility model discloses a multilayer heat -proof sheet metal structure of N2 gas heater, including assembly sheet metal part, the first assembly frame and the second assembly frame are provided with respectively on the assembly sheet metal part top and below, the both ends of assembly sheet metal part all are fixedly connected with the assembly passageway, two symmetrical assembly branch plates are arranged in the first assembly frame top, the utility model discloses, through stainless steel layer play to block high temperature resistance excellent, can be directly used in high temperature environment's structural member, then aluminum plate layer because its material lightweight and heat conductivity are good and through anodic oxidation form porous oxide layer and improve the heat -proof property, and the galvanized layer of galvanized steel layer can provide basic anticorrosion protection, and then use in combination with the heat -proof coating or interlayer structure, thereby play to the assembly sheet metal part heat -proof, and then block the transfer of heat and heat loss, make reduce because thermal expansion and cold shrinkage and the uneven internal stress and occur deformation, and the temperature field is even and prolongs the life, thereby improve the use effect.

Description

Technical Field

[0001] This utility model relates to the field of sheet metal technology, and in particular to a multi-layer heat-insulating sheet metal structure for an N2 gas heater. Background Technology

[0002] The main functions of N2 gas heaters include providing pure, oxygen-free, high-temperature nitrogen gas to prevent oxidation, ensure process stability and product quality. Specific applications include: chemical industry, electronics and semiconductor manufacturing, pharmaceutical industry, food processing, steel manufacturing, and glass manufacturing. The multi-layered insulating sheet metal of the heater primarily improves thermal efficiency, reduces heat loss, extends service life, and lowers maintenance costs. Through its structural design, the multi-layered insulating sheet metal effectively blocks heat transfer and reduces heat loss, thereby improving the heater's thermal efficiency. Traditional insulating sheet metal structures are prone to deformation at high temperatures due to thermal expansion and contraction and uneven internal stress, leading to uneven temperature fields and shortened service life, thus reducing performance. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-layer heat-insulating sheet metal structure for an N2 gas heater.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a multi-layer heat-insulating sheet metal structure for an N2 gas heater, comprising an assembly sheet metal part, wherein a first assembly frame and a second assembly frame are respectively provided above and below the assembly sheet metal part, and an assembly channel is fixedly connected to both ends of the assembly sheet metal part; two symmetrical assembly support plates are provided through the top of the first assembly frame, and multiple assembly support blocks are fixedly connected to the surface of the assembly support plates; assembly insertion holes are provided on the side walls of the assembly support blocks; an assembly baffle is fixedly connected to one end of the assembly support plate, and the other end of the assembly support plate is fixedly connected to the second assembly frame; assembly slots are provided on both the front and rear sides of the first assembly frame; connecting strips are fixedly connected to both the front and rear sides of the first assembly frame, and connecting insertion holes are provided on the side walls of the connecting strips; and fixing components are connected to both the front and rear sides of the first assembly frame.

[0005] A base layer is fixedly connected between the two sides of the inner wall of the assembled sheet metal part, and heat insulation components are connected to the top and bottom of the base layer.

[0006] Two symmetrical adjustment components are fixedly connected between the two sides of the inner wall of the second assembly frame.

[0007] As a further description of the above technical solution:

[0008] The fixing component includes a fixing recess that is fixedly connected to the surface of the first assembly frame. A fixing shaft is rotatably connected between the two sides of the inner wall of the fixing recess. A fixing U-shaped plate is fixedly sleeved on the outer wall of the fixing shaft. The inside of the fixing U-shaped plate is movably engaged with one of the assembly blocks. Two fixing grooves are opened on the surface of the fixing U-shaped plate. A fixing slider is slidably connected inside the fixing groove. A fixing spring is fixedly connected to the inner wall of the fixing groove.

[0009] As a further description of the above technical solution:

[0010] The end of the fixed spring is fixedly connected to its corresponding fixed slider. A fixed pull plate is fixedly connected between the two fixed sliders. A fixed insert is fixedly connected to the side wall of the fixed pull plate. The fixed insert is movably inserted into its corresponding assembly hole. A connection port is opened through the surface of the fixed U-shaped plate. The corresponding connecting strip is movably engaged inside the connection port.

[0011] As a further description of the above technical solution:

[0012] A connecting strip is provided through the side wall of the fixed U-shaped plate. A connecting pull block is fixedly connected to one end of the connecting strip, and the other end of the connecting strip is movably inserted into the corresponding connecting hole. A connecting spring is movably sleeved on the outer side wall of the connecting strip, and the two ends of the connecting spring are fixedly connected to the side wall of the connecting pull block and the side wall of the fixed U-shaped plate, respectively.

[0013] As a further description of the above technical solution:

[0014] The thermal insulation component includes a galvanized steel layer fixedly connected to the top of the base layer, an aluminum plate layer fixedly connected to the top of the galvanized steel layer, and a stainless steel layer fixedly connected to the top of the aluminum plate layer.

[0015] As a further description of the above technical solution:

[0016] The adjustment assembly includes an adjustment horizontal plate fixedly connected between the two sides of the inner wall of the second assembly frame. Two symmetrical adjustment blocks are movably sleeved on the outer wall of the adjustment horizontal plate. An adjustment hollow plate is fixedly connected to the bottom of the adjustment block. An adjustment extension plate is slidably connected to one end of the adjustment hollow plate. An adjustment bolt is threaded through and threaded onto the surface of the adjustment hollow plate. An movable groove is provided on the side wall of the adjustment horizontal plate.

[0017] As a further description of the above technical solution:

[0018] Two adjusting sliders are slidably connected inside the movable groove. One end of each adjusting slider is fixedly connected to the inner wall of its corresponding adjusting sleeve. A movable bidirectional screw is rotatably connected between the two sides of the inner wall of the movable groove. Both adjusting sliders are threadedly connected to the outer wall of the movable bidirectional screw. One end of the movable bidirectional screw passes through the adjusting cross plate and the second assembly frame and is fixedly connected to a movable rotating block. The side wall of the movable rotating block has multiple movable insertion holes. Movable components are connected to the surface of the second assembly frame.

[0019] As a further description of the above technical solution:

[0020] The movable component includes an auxiliary groove formed on the surface of the second assembly frame. A movable slider is slidably connected inside the auxiliary groove. One end of the movable slider is fixedly connected to the inner wall of the auxiliary groove via a movable spring. A movable pull block is fixedly connected to the surface of the movable slider. A movable insert is fixedly connected to the side wall of the movable pull block. One end of the movable insert is movably inserted into one of the movable holes.

[0021] This utility model has the following beneficial effects:

[0022] 1. By using a fixing component, the first and second assembly frames can be pushed, causing the second assembly frame to move the assembly support plate along the direction of the first assembly frame. Then, the first and second assembly frames contact and abut against the sheet metal parts. Next, the fixed retaining plate is pried and flipped, causing its interior to engage with one of the assembly support blocks. Then, the fixing pull plate is released, allowing the fixing spring to provide a restoring force to the fixing slider, causing the fixing slider to move the fixing pull plate and fixing insert back to their original positions. Finally, the fixing insert is inserted into its corresponding assembly socket for limiting, thereby strengthening the sheet metal parts. To reduce deformation caused by thermal expansion and contraction of rigid sheet metal parts, thermal insulation components can be used. The stainless steel layer provides excellent high-temperature resistance and can be directly used in structural components in high-temperature environments. The aluminum plate layer, due to its lightweight material and good thermal conductivity, is anodized to form a porous oxide layer, further enhancing its thermal insulation. Meanwhile, the galvanized steel layer provides basic anti-corrosion protection. Combined with thermal insulation coatings or sandwich structures, this process effectively insulates the assembled sheet metal parts, preventing heat transfer and loss. This reduces deformation caused by thermal expansion and contraction and uneven internal stress, while also ensuring a uniform temperature field and extending service life, thereby improving overall performance.

[0023] 2. Using the adjustment assembly, the adjustment extension plate can be pulled to extend along one end of the adjustment hollow plate to a suitable distance. Then, the adjustment bolt is rotated again to move closer to and tighten against the adjustment extension plate. Next, the movable rotating block is rotated, causing the movable rotating block to drive the movable bidirectional screw to rotate. Then, the two adjustment sliders move closer to each other along the direction of the movable bidirectional screw. At the same time, the adjustment sliders are slidably installed and guided inside the movable groove. Then, the adjustment sliders also drive the adjustment sleeve block to move along the direction of the adjustment horizontal plate. Then, the adjustment sleeve block also drives the adjustment hollow plate and the adjustment extension plate to move, so that the adjustment extension plate provides support strength after tightening against the assembly channel of the assembly sheet metal parts. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the multi-layer heat-insulating sheet metal structure of the N2 gas heater proposed in this utility model.

[0025] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0026] Figure 3 This is a schematic diagram of the internal structure of the assembled sheet metal parts of the multi-layer heat-insulating sheet metal structure of the N2 gas heater proposed in this utility model.

[0027] Figure 4 for Figure 1 Enlarged structural diagram at point B.

[0028] Legend:

[0029] 1. Assembly sheet metal parts; 2. First assembly frame; 3. Second assembly frame; 4. Assembly support plate; 5. Assembly baffle; 6. Assembly support block; 7. Fixing recess; 8. Fixing pivot; 9. Fixing retaining plate; 10. Fixing slider; 11. Fixing spring; 12. Fixing pull plate; 13. Fixing insert; 14. Connecting clip; 15. Connecting insert; 16. Connecting pull block; 17. Connecting spring; 18. Base layer; 19. Galvanized steel layer; 20. Aluminum plate layer; 21. Stainless steel layer; 22. Adjusting cross plate; 23. Adjusting sleeve block; 24. Adjusting hollow plate; 25. Adjusting extension plate; 26. Adjusting slider; 27. Movable double-acting screw; 28. Movable rotating block; 29. ​​Movable slider; 30. Movable spring; 31. Movable pull block; 32. Movable insert. Detailed Implementation

[0030] 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.

[0031] Reference Figure 1-4 The multi-layer heat-insulating sheet metal structure of the N2 gas heater provided by this utility model includes an assembly sheet metal part 1. A first assembly frame 2 and a second assembly frame 3 are respectively provided above and below the assembly sheet metal part 1. Assembly channels are fixedly connected to both ends of the assembly sheet metal part 1. Two symmetrical assembly support plates 4 are provided through the top of the first assembly frame 2. Multiple assembly support blocks 6 are fixedly connected to the surface of the assembly support plates 4. Assembly insertion holes are opened on the side walls of the assembly support blocks 6. An assembly baffle 5 is fixedly connected to one end of the assembly support plate 4. The other end of the assembly support plate 4 is fixedly connected to the second assembly frame 3. Assembly slots are opened on both the front and rear sides of the first assembly frame 2. Connecting strips 14 are fixedly connected to both the front and rear sides of the first assembly frame 2. Connecting strips 14 are opened on the side walls of the connecting strips 14. Fixing components are connected to both the front and rear sides of the first assembly frame 2. The fixing components are used to limit the position of the assembly support plates 4 after adjustment. The fixing components include a fixing recess 7 fixedly connected to the surface of the first assembly frame 2. A fixing shaft 8 is rotatably connected between the two sides of the inner wall of the fixing recess 7. A fixing U-shaped plate 9 is fixedly sleeved on the outer wall of the fixing shaft 8. The fixed herringbone plate 9 is movably engaged with one of the assembly blocks 6. Two fixing grooves are formed on the surface of the fixed herringbone plate 9. A fixing slider 10 is slidably connected inside each fixing groove. A fixing spring 11 is fixedly connected to the inner wall of the fixing groove, and the end of the fixing spring 11 is fixedly connected to its corresponding fixing slider 10. A fixing pull plate 12 is fixedly connected between the two fixing sliders 10. A fixing insert 13 is fixedly connected to the side wall of the fixing pull plate 12, and the fixing insert 13 is movably engaged with its corresponding assembly hole. A connection port is formed through the surface of the fixed herringbone plate 9. The connecting strip 14 inside the connecting port is movably engaged with the corresponding connecting strip. A connecting insert 15 is provided through the side wall of the fixed U-shaped plate 9. One end of the connecting insert 15 is fixedly connected to a connecting pull block 16, and the other end of the connecting insert 15 is movably engaged with the corresponding connecting socket. A connecting spring 17 is movably sleeved on the outer wall of the connecting insert 15. Both ends of the connecting spring 17 are fixedly connected to the side wall of the connecting pull block 16 and the side wall of the fixed U-shaped plate 9, respectively. The movable engagement and limiting of the connecting insert 15 with its corresponding connecting socket enhances the stability of the fixed U-shaped plate 9.

[0032] A base layer 18 is fixedly connected between the two sides of the inner wall of the sheet metal part 1. A heat insulation component is connected to the top and bottom of the base layer 18. The heat insulation component includes a galvanized steel layer 19 fixedly connected to the top of the base layer 18. An aluminum plate layer 20 is fixedly connected to the top of the galvanized steel layer 19. A stainless steel layer 21 is fixedly connected to the top of the aluminum plate layer 20. The stainless steel layer 21 on the base layer 18 serves to block high temperature resistance and is suitable for use in high-temperature environments.

[0033] Two symmetrical adjustment components are fixedly connected between the two sides of the inner wall of the second assembly frame 3. Each adjustment component includes an adjustment horizontal plate 22 fixedly connected between the two sides of the inner wall of the second assembly frame 3. Two symmetrical adjustment sleeves 23 are movably sleeved on the outer wall of the adjustment horizontal plate 22. An adjustment hollow plate 24 is fixedly connected to the bottom of each adjustment sleeve 23. An adjustment extension plate 25 is slidably connected to one end of the adjustment hollow plate 24. An adjustment bolt is threaded through and threaded onto the surface of the adjustment hollow plate 24. A movable groove is provided on the side wall of the adjustment horizontal plate 22, and two adjustment sliders 26 are slidably connected inside the movable groove. One end of each adjustment slider 26 is adjusted accordingly. The inner wall of the sleeve block 23 is fixedly connected, and a movable bidirectional screw 27 is rotatably connected between the two sides of the inner wall of the movable groove. Both adjusting sliders 26 are threadedly connected to the outer wall of the movable bidirectional screw 27. One end of the movable bidirectional screw 27 passes through the adjusting horizontal plate 22 and the second assembly frame 3 and is fixedly connected to a movable rotating block 28. The side wall of the movable rotating block 28 has multiple movable insertion holes. By rotating the movable bidirectional screw 27 through the movable rotating block 28, the two adjusting sliders 26 move closer or further away from each other along the movable bidirectional screw 27. At the same time, the adjusting sleeve block 23 on the adjusting slider 26 is movably sleeved with the outer wall of the adjusting horizontal plate 22 and guided.

[0034] The second assembly frame 3 has a movable component connected to its surface. The movable component includes an auxiliary groove formed on the surface of the second assembly frame 3. A movable slider 29 is slidably connected inside the auxiliary groove. One end of the movable slider 29 is fixedly connected to the inner wall of the auxiliary groove via a movable spring 30. A movable pull block 31 is fixedly connected to the surface of the movable slider 29. A movable insert 32 is fixedly connected to the side wall of the movable pull block 31. One end of the movable insert 32 is movably inserted into one of the movable holes. By movably inserting the movable insert 32 into one of the movable holes, the limit position of the movable rotating block 28 after adjustment can be achieved.

[0035] Working principle: In use, first pull the first assembly frame 2 and the second assembly frame 3. Then, the second assembly frame 3 drives the assembly support plate 4 to move along the direction on the first assembly frame 2. Then, the multiple assembly support blocks 6 on the assembly support plate 4 also move along the assembly slots on the first assembly frame 2. Then, the assembly sheet metal part 1 is passed between the first assembly frame 2 and the second assembly frame 3. Then, push the first assembly frame 2 and the second assembly frame 3 so that the second assembly frame 3 drives the assembly support plate 4 to move along the direction on the first assembly frame 2. Then, the first assembly frame 2 and the second assembly frame 3 come into contact with and abut against the assembly sheet metal part 1.

[0036] Simultaneously, the fixed pull plate 12 is pulled, causing the fixed pull plate 12 to drive the fixed slider 10 and the fixed spring 11 to slide in the fixed groove. Then, the fixed insert 13 on the fixed pull plate 12 also moves. Next, the fixed ring plate 9 is pried and flipped, so that the inside of the fixed ring plate 9 is movably engaged with one of the assembly blocks 6. Then, the fixed pull plate 12 is released, so that the fixed spring 11 gives the fixed slider 10 a restoring force, causing the fixed slider 10 to drive the fixed pull plate 12 and the fixed insert 13 to reset. Then, the fixed insert 13 is inserted into its corresponding assembly socket for limiting, thereby strengthening the strength of the assembled sheet metal part 1 and reducing the deformation caused by thermal expansion and contraction of the assembled sheet metal part 1.

[0037] Rotate the adjusting bolt on the hollow adjusting plate 24 to move it away from the adjusting extension plate 25. Then pull the adjusting extension plate 25 to extend it to a suitable distance along one end of the hollow adjusting plate 24. Next, rotate the adjusting bolt again to bring it closer to the adjusting extension plate 25 and press it against it. Then pull the movable pull block 31 to make it slide the movable slider 29 and the movable spring 30 in the auxiliary groove. Then the movable pull block 31 also moves the movable insert 32 to separate it from one of the movable holes.

[0038] As the rotating block 28 rotates, it drives the movable bidirectional screw 27 to rotate. Then, the two adjusting sliders 26 move closer to each other along the direction of the movable bidirectional screw 27. At the same time, the adjusting sliders 26 are slidably installed and guided inside the movable groove. Then, the adjusting sliders 26 also drive the adjusting sleeve block 23 to move along the direction of the adjusting horizontal plate 22. Then, the adjusting sleeve block 23 also drives the adjusting hollow plate 24 and the adjusting extension plate 25 to move.

[0039] The adjustment extension plate 25 provides support to the assembly channel of the assembly sheet metal part 1 after it is pressed against it. Then, the movable pull block 31 is released, so that the movable spring 30 gives the movable slider 29 a restoring force. This causes the movable slider 29 to also drive the movable pull block 31 and the movable insert 32 to reset and be inserted into one of the movable holes for a limit position. This further reduces the deformation caused by thermal expansion and contraction of the assembly sheet metal part 1.

[0040] Meanwhile, the stainless steel layer 21 on the base layer 18 provides excellent high-temperature resistance and can be directly used in structural components in high-temperature environments. Then, the aluminum plate layer 20, due to its lightweight material and good thermal conductivity, forms a porous oxide layer through anodizing to improve thermal insulation. At the same time, the galvanized steel layer 19 provides basic anti-corrosion protection. Combined with the use of thermal insulation coatings or sandwich structures, it can provide thermal insulation for the assembled sheet metal parts 1, thereby blocking the transfer and dissipation of heat.

[0041] 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 multi-layer heat-insulating sheet metal structure for an N2 gas heater, comprising assembled sheet metal parts (1), characterized in that: The assembly sheet metal part (1) is provided with a first assembly frame (2) and a second assembly frame (3) above and below respectively. Both ends of the assembly sheet metal part (1) are fixedly connected to assembly channels. The top of the first assembly frame (2) is provided with two symmetrical assembly support plates (4). Multiple assembly support blocks (6) are fixedly connected to the surface of the assembly support plate (4). Assembly insertion holes are opened on the side wall of the assembly support block (6). One end of the assembly support plate (4) is fixedly connected to an assembly baffle (5). The other end of the assembly support plate (4) is fixedly connected to the second assembly frame (3). Assembly slots are opened on both the front and rear sides of the first assembly frame (2). Connecting strips (14) are fixedly connected on both the front and rear sides of the first assembly frame (2). Connecting insertion holes are opened on the side wall of the connecting strips (14). Fixing components are connected on both the front and rear sides of the first assembly frame (2). A base layer (18) is fixedly connected between the two sides of the inner wall of the assembled sheet metal part (1), and heat insulation components are connected to the top and bottom of the base layer (18); The inner walls of the second assembly frame (3) are fixedly connected to two symmetrical adjustment components.

2. The multi-layer heat-insulating sheet metal structure of the N2 gas heater according to claim 1, characterized in that: The fixing component includes a fixing recess (7) fixedly connected to the surface of the first assembly frame (2). A fixing shaft (8) is rotatably connected between the two sides of the inner wall of the fixing recess (7). A fixing spiral plate (9) is fixedly sleeved on the outer wall of the fixing shaft (8). The inside of the fixing spiral plate (9) is movably engaged with one of the assembly blocks (6). Two fixing grooves are opened on the surface of the fixing spiral plate (9). A fixing slider (10) is slidably connected inside the fixing groove. A fixing spring (11) is fixedly connected to the inner wall of the fixing groove.

3. The multi-layer heat-insulating sheet metal structure of the N2 gas heater according to claim 2, characterized in that: The end of the fixed spring (11) is fixedly connected to the corresponding fixed slider (10). A fixed pull plate (12) is fixedly connected between the two fixed sliders (10). A fixed insert (13) is fixedly connected to the side wall of the fixed pull plate (12). The fixed insert (13) is movably inserted into the corresponding assembly hole. A connection port is opened through the surface of the fixed ring plate (9). The connection port is movably engaged with the corresponding connecting clip (14) inside.

4. The multi-layer heat-insulating sheet metal structure of the N2 gas heater according to claim 3, characterized in that: A connecting strip (15) is provided through the side wall of the fixed spiral plate (9). One end of the connecting strip (15) is fixedly connected to a connecting pull block (16), and the other end of the connecting strip (15) is movably inserted into the corresponding connecting hole. A connecting spring (17) is movably sleeved on the outer side wall of the connecting strip (15). The two ends of the connecting spring (17) are fixedly connected to the side wall of the connecting pull block (16) and the side wall of the fixed spiral plate (9), respectively.

5. The multi-layer heat-insulating sheet metal structure of the N2 gas heater according to claim 1, characterized in that: The thermal insulation component includes a galvanized steel layer (19) fixedly connected to the top of the base layer (18), an aluminum plate layer (20) fixedly connected to the top of the galvanized steel layer (19), and a stainless steel layer (21) fixedly connected to the top of the aluminum plate layer (20).

6. The multi-layer heat-insulating sheet metal structure of the N2 gas heater according to claim 1, characterized in that: The adjustment assembly includes an adjustment cross plate (22) fixedly connected between the two sides of the inner wall of the second assembly frame (3). Two symmetrical adjustment sleeves (23) are movably sleeved on the outer side wall of the adjustment cross plate (22). An adjustment hollow plate (24) is fixedly connected to the bottom of the adjustment sleeves (23). An adjustment extension plate (25) is slidably connected to one end of the adjustment hollow plate (24). An adjustment bolt is threaded through and threaded onto the surface of the adjustment hollow plate (24). An movable groove is provided on the side wall of the adjustment cross plate (22).

7. The multi-layer heat-insulating sheet metal structure of the N2 gas heater according to claim 6, characterized in that: Two adjusting sliders (26) are slidably connected inside the movable groove. One end of the adjusting slider (26) is fixedly connected to the inner wall of the corresponding adjusting sleeve block (23). A movable bidirectional screw (27) is rotatably connected between the two sides of the inner wall of the movable groove. Both adjusting sliders (26) are threadedly connected to the outer wall of the movable bidirectional screw (27). One end of the movable bidirectional screw (27) passes through the adjusting cross plate (22) and the second assembly frame (3) and is fixedly connected to a movable rotating block (28). The side wall of the movable rotating block (28) is provided with multiple movable insertion holes. Movable components are connected to the surface of the second assembly frame (3).

8. The multi-layer heat-insulating sheet metal structure of the N2 gas heater according to claim 7, characterized in that: The movable component includes an auxiliary groove formed on the surface of the second assembly frame (3). A movable slider (29) is slidably connected inside the auxiliary groove. One end of the movable slider (29) is fixedly connected to the inner wall of the auxiliary groove via a movable spring (30). A movable pull block (31) is fixedly connected to the surface of the movable slider (29). A movable insert (32) is fixedly connected to the side wall of the movable pull block (31). One end of the movable insert (32) is movably inserted into one of the movable sockets.

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