High-precision aspheric optical lens pressing device

Abstract

The high-precision aspheric optical lens pressing device comprises a bottom plate, supporting seats are installed at the four corners of the top of the bottom plate, a top seat is installed at the tops of the supporting seats, a cross-shaped fixing frame is installed on the inner side of the top seat, and a hydraulic device is installed in the center of the top of the bottom plate. Gas with heat is jetted from the gas outlet pipe through the gas source storage device, then the gas is conveyed to the first spiral pipeline through the first arc-shaped conveying pipe, the gas can heat the upper die when located in the first arc-shaped conveying pipe, and a to-be-machined workpiece can be heated in the process that the gas passes through the first spiral pipeline; gas enters a second heat conduction plate through a first spiral pipeline, then is guided into a second spiral pipeline to be conveyed upwards in a spiral mode, is conveyed to a gas inlet pipe through a second arc-shaped conveying pipe and then enters a gas source storage device again to be heated, it is guaranteed that the gas is in a high-temperature state all the time in the conveying process, and a machined part is fully heated.

Description

Technical Field

[0001] The invention relates to the technical field of optical lens compression molding, in particular to a high-precision aspheric optical lens pressing device. Background Art

[0002] Aspheric lens, a lens with a non-spherical refractive surface, can generally be divided into two categories: simple surface and compound surface. Compared with traditional spherical lenses, optical aspheric lenses have the advantages of eliminating aberrations and obtaining a wider field of view. They are widely used in astronomy, military, transportation, medicine, art and other fields. In order to reduce the later grinding allowance of optical lenses and improve the processing accuracy of optical lenses, optical lenses are often produced by pressing.

[0003] The optical glass lens compression molding technology requires processing in a high-temperature, oxygen-free environment. During processing, a spherical glass blank is placed in a high-precision mold, and the spherical glass blank is softened by heating. Then, the mold is pressurized to replicate the shape of the mold onto the glass blank. However, in the prior art, sufficient heat must be ensured during the heating process of the spherical glass blank to soften it. However, most of them use a heating mold to conduct heat to the glass blank, which requires a large amount of heat to continuously heat the mold, resulting in a large amount of energy loss, a high pressing cost, and it is difficult to press aspheric optical glass lenses of different sizes in the same mold.

[0004] Therefore, it is necessary to provide a high-precision aspheric optical lens pressing device to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a high-precision aspheric optical lens pressing device to solve the problems existing in the above-mentioned background technology. The technical solution of the present invention aims at the technical problem that the existing technical solution is too single, and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-precision aspheric optical lens pressing device, comprising a base plate, support seats are installed at the four corners of the top of the base plate, a top seat is installed on the top of the support seat, a cross fixing frame is installed on the inner side of the top seat, a hydraulic device is installed at the top center of the base plate, a support plate is connected to the top of the telescopic end of the hydraulic device, a lower mold is installed on the top of the support plate, an air source storage device is installed at the bottom of the cross fixing frame, an upper mold is installed at the bottom center of the air source storage device, a replaceable processing component is installed on the side of the lower mold opposite to the upper mold, and a heat conduction mechanism is arranged on the outer side of the upper mold.

[0007] Preferably, limiting rods are installed at the centers of the two ends of the top of the bottom plate, and the outer wall of the limiting rod is installed with limiting seats fixed to the two ends of the support plate.

[0008] Preferably, the heat conduction mechanism includes an outlet pipe installed at one end of the bottom of the air source storage device, a heat conduction plate 1 is installed on the outer wall of the upper mold, an arc-shaped transport pipe 1 connected to the outlet pipe is penetrated through the top end of the heat conduction plate 1, a spiral pipe 1 is connected to the end of the arc-shaped transport pipe 1, an air inlet pipe is connected to the other end of the bottom of the air source storage device, the bottom of the air inlet pipe is connected to an arc-shaped transport pipe 2 penetrating the bottom of the heat conduction plate 1, and a spiral pipe 2 is connected to the end of the arc-shaped transport pipe 2.

[0009] Preferably, the outer wall of the lower mold is installed with a heat conducting plate 2, one end of the top of the heat conducting plate 2 is connected to a hollow tube 1, the end of the spiral pipe 1 is connected to a sleeve 1 that matches the hollow tube 1, the other end of the top of the heat conducting plate 2 is connected to a hollow tube 2, and the end of the spiral pipe 2 is connected to a sleeve 2 that matches the hollow tube 2.

[0010] Preferably, the spiral pipe 1 and the spiral pipe 2 have the same spiral direction and are arranged alternately up and down.

[0011] Preferably, the processing component includes a processing groove opened in the center of one side opposite to the upper mold and the lower mold, a connecting groove 1 is provided at both ends of the processing groove, a movable block which can move up and down is provided inside the connecting groove 1, a connecting groove 2 is provided at the end of the connecting groove 1 away from the processing groove, a stopper which can move left and right is provided inside the connecting groove 2, a forming mold is installed inside the processing groove, and protruding blocks arranged between the movable block and the stopper are installed at both ends of the forming mold.

[0012] Preferably, the end of the communicating groove 1 away from the end surface is connected to a communicating groove 3, and the interior of the communicating groove 3 is connected to a spring 1 fixed to the end of the moving block away from the end surface.

[0013] Preferably, a connecting groove 4 is formed at one end of the connecting groove 2 away from the processing groove, and a spring 2 fixed to the end of the stopper away from the processing groove is connected inside the connecting groove 4.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention sprays hot gas from the gas outlet pipe through the gas source storage device, and then transports the gas to the spiral pipe one through the arc transport pipe one. The gas can heat the upper mold when it is inside the arc transport pipe one, and the gas can heat the workpiece to be processed when it passes through the spiral pipe one. The gas enters the inside of the heat conduction plate two through the spiral pipe one, and then is introduced into the spiral pipe two to transport the gas spirally upward. After being transported to the gas inlet pipe through the arc transport pipe two, it re-enters the gas source storage device for heating, ensuring that the gas is always in a high temperature state during the transportation process, so that the workpiece is fully heated; The hollow tubes 1 and 2 provided in the present invention are inserted into the sleeves 1 and 2 connected to the ends of the spiral pipes 1 and 2 when the lower mold moves upward, thus realizing a gas circulation structure. The upper mold, the lower mold and the workpiece are fully heated during the long-term circulation of the gas. The spiral pipes 1 and 2 are arranged in the same spiral direction and are staggered up and down, which can not only increase the area of ​​the heating area, but also the spiral sealing structure composed of the spiral pipes 1 and 2 can reduce the loss of heat, so that the workpiece is heated more fully. When the present invention is performing the pressing work, the lower mold will move toward the upper mold. At the beginning, the upper and lower parts of the workpiece will be pressed between the upper and lower molds. Then the hydraulic device continues to push the support plate upward. At this time, the lower mold will push the fully heated workpiece upward for extrusion and deformation. Finally, the lower mold will contact the upper mold, and the workpiece will become the shape of the aspheric optical lens to be processed. In addition, the shape of aspheric optical lenses of different sizes can be changed by setting a detachable molding mold, or multiple sets of molding molds can be superimposed, and by setting molding grooves with gradually increasing sizes from the inside to the outside, the corresponding installation method can be selected according to needs.

[0015] When installing the molding die of the present invention, the protruding blocks connected at both ends of the molding die will squeeze the moving block to move in the direction of spring one, and then the molding die can be successfully installed by blocking the protruding blocks through the set blocks. When disassembling the molding die, it is only necessary to move the blocks to both sides to compress spring two to release the limit on the protruding blocks, and the molding die can be disassembled. After the innermost molding die is disassembled, the set moving blocks will move toward the end face and be flush with the end faces of the upper mold and the lower mold, and will compress the blocks to the two ends of the connecting groove four. At this time, a larger molding groove will be formed, and a larger aspheric optical lens can be prepared. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the present invention in a non-working state; Figure 2 A three-dimensional diagram of the present invention at work; Figure 3 This is a schematic diagram of the state in which the upper mold and the lower mold of the present invention are fitted together; Figure 4 It is a schematic diagram of the state in which the upper mold and the lower mold are separated according to the present invention; Figure 5 A schematic diagram of the structure for conveying heated gas according to the present invention; Figure 6 This is a schematic diagram of the structure of the present invention for recovering heated gas; Figure 7 It is a front view structural schematic diagram of the upper die and the lower die of the present invention; Figure 8It is a front view structural schematic diagram of the upper mold and the lower mold of the present invention after the processing components are removed; Fig. 9 It is a schematic diagram of the top view of the structure of the heat conducting plate 2 of the present invention.

[0017] In the figure: 1, bottom plate; 2, support seat; 3, top seat; 4, cross fixing frame; 5, hydraulic device; 6, support plate; 7, lower die; 8, air source storage device; 9, upper die; 10, processing assembly; 101, processing groove; 102, connecting groove 1; 103, moving block; 104, connecting groove 2; 105, stopper; 106, forming mold; 107, protruding block; 11, heat conduction mechanism; 111, air outlet pipe; 112. Heat transfer plate 1; 113. Arc transport pipe 1; 114. Spiral pipe 1; 115. Air intake pipe; 116. Arc transport pipe 2; 117. Spiral pipe 2; 12. Limit rod; 13. Limit seat; 14. Heat transfer plate 2; 15. Hollow pipe 1; 16. Sleeve 1; 17. Hollow pipe 2; 18. Sleeve 2; 19. Connecting groove 3; 20. Spring 1; 21. Connecting groove 4; 22. Spring 2. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0020] See also Figure 1-9 A high-precision aspheric optical lens pressing device includes a base plate 1, support seats 2 are installed at the four corners of the top of the base plate 1, a top seat 3 is installed on the top of the support seat 2, a cross fixing frame 4 is installed on the inner side of the top seat 3, a hydraulic device 5 is installed at the top center of the base plate 1, a support plate 6 is connected to the top of the telescopic end of the hydraulic device 5, a lower mold 7 is installed on the top of the support plate 6, an air source storage device 8 is installed at the bottom of the cross fixing frame 4, an upper mold 9 is installed at the bottom center of the air source storage device 8, a replaceable processing component 10 is installed on the side of the lower mold 7 opposite to the upper mold 9, and a heat conduction mechanism 11 is arranged on the outer side of the upper mold 9.

[0021] like Figure 1-9 As shown, a limit rod 12 is installed at the center of the two ends of the top of the base plate 1, and the outer wall of the limit rod 12 is installed with a limit seat 13 fixed at the two ends of the support plate 6. The limit rod 12 and the limit seat 13 are set to limit the support plate 6 to prevent the support plate 6 from offsetting during the up and down movement, resulting in errors in the final pressing of the aspheric optical lens.

[0022] like Figure 1-9 As shown, the heat conduction mechanism 11 includes an outlet pipe 111 installed at one end of the bottom of the gas source storage device 8, a heat conduction plate 112 is installed on the outer wall of the upper mold 9, and an arc-shaped transport pipe 113 connected to the outlet pipe 111 is penetrated at one end of the top of the heat conduction plate 112, and a spiral pipe 114 is connected to the end of the arc-shaped transport pipe 113. An air inlet pipe 115 is connected to the other end of the bottom of the gas source storage device 8, and the bottom of the air inlet pipe 115 is connected to an arc-shaped transport pipe 116 penetrating the bottom of the heat conduction plate 112, and the end of the arc-shaped transport pipe 116 is connected to the spiral pipe 117. When the hydraulic device 5 controls the support plate 6 to move upward, the lower mold 7 moves toward the direction of the upper mold 9, and moves. When it reaches a certain distance, hot gas is ejected from the outlet pipe 111 through the gas source storage device 8, and then transported to the spiral pipe 114 through the arc transport pipe 113. The gas can heat the upper mold 9 when it is inside the arc transport pipe 113, and the workpiece to be processed can be heated during the process of the gas passing through the spiral pipe 114. The gas enters the heat conduction plate 2 14 through the spiral pipe 114, and then is introduced into the spiral pipe 2 117 to transport the gas spirally upward. After being transported to the air inlet pipe 115 through the arc transport pipe 2 116, it re-enters the gas source storage device 8 for heating, thereby ensuring that the gas is always in a high temperature state during the transportation process, so that the workpiece is fully heated.

[0023] like Figure 1-9As shown, a heat conducting plate 14 is installed on the outer wall of the lower mold 7, a hollow tube 15 is connected to one end of the top of the heat conducting plate 14, a sleeve 16 matching with the hollow tube 15 is connected to the end of the spiral pipe 114, a hollow tube 17 is connected to the other end of the top of the heat conducting plate 14, a sleeve 18 matching with the hollow tube 17 is connected to the end of the spiral pipe 117, an annular channel connected with the hollow tube 15 and the hollow tube 17 is provided inside the heat conducting plate 14, and the hollow tube 15 and the hollow tube 17 are inserted into the sleeve 16 and the sleeve 18 connected to the ends of the spiral pipe 114 and the spiral pipe 117 when the lower mold 7 moves upward, thereby realizing a gas circulation structure, and fully heating the upper mold 9, the lower mold 7 and the workpiece during the long-term circulation of the gas.

[0024] like Figure 1-9 As shown, the spiral pipe 1 114 and the spiral pipe 2 117 have the same spiral direction and are staggered up and down. The setting of the spiral pipe 1 114 and the spiral pipe 2 117 having the same spiral direction and being staggered up and down can not only increase the heating area, but also the spiral sealing structure composed of the spiral pipe 1 114 and the spiral pipe 2 117 can reduce heat loss, so that the heating of the workpiece is more sufficient.

[0025] like Figure 1-9 As shown, the processing assembly 10 includes a processing groove 101 opened at the center of the side opposite to the upper mold 9 and the lower mold 7, the two ends of the processing groove 101 are connected to a connecting groove 102, and a moving block 103 that can move up and down is arranged inside the connecting groove 102, and a connecting groove 2 104 is connected to the end of the connecting groove 102 away from the processing groove 101, and a stopper 105 that can move left and right is arranged inside the connecting groove 2 104, and a forming mold 106 is installed inside the processing groove 101, and protruding blocks 107 arranged between the moving block 103 and the stopper 105 are installed at both ends of the forming mold 106. When the pressing work is performed, the lower mold 7 It will move toward the upper mold 9. At the beginning, the upper and lower parts of the workpiece will be pressed between the upper mold 9 and the lower mold 7. Then the hydraulic device 5 will continue to push the support plate 6 to move upward. At this time, the lower mold 7 will push the fully heated workpiece to be squeezed and deformed upward. Finally, the lower mold 7 will contact the upper mold 9, and the workpiece will become the shape of the aspheric optical lens to be processed. In addition, the shape of aspheric optical lenses of different sizes can be changed by setting a detachable molding mold 106, or a plurality of molding molds 106 can be superimposed. By setting molding grooves with gradually increasing sizes from the inside to the outside, the corresponding installation method can be selected according to needs.

[0026] like Figure 1-9As shown, the end of the connecting groove 102 away from the end face is connected to a connecting groove 3 19, and the interior of the connecting groove 3 19 is connected to a spring 20 fixed to the end of the moving block 103 away from the end face. The set spring 20 can control the up and down movement of the moving block 103. When installing the molding die 106, the protruding blocks 107 connected at both ends of the molding die 106 will squeeze the moving block 103 to move toward the direction of the spring 20, and then the molding die 106 can be successfully installed by blocking the protruding block 107 through the set stopper 105. When disassembling the molding die 106, it is only necessary to move the stopper 105 to both sides to compress the spring 22 to release the limit on the protruding block 107, and the molding die 106 can be disassembled. After the innermost molding die 106 is disassembled, the set moving block 103 will move toward the end face and be flush with the end faces of the upper mold 9 and the lower mold 7, and will compress the stopper 105 to the two ends of the connecting groove 4 21. At this time, a larger molding groove will be formed, and a larger aspheric optical lens can be prepared.

[0027] like Figure 1-9 As shown, a connecting groove 4 21 is opened at one end of the connecting groove 2 104 away from the processing groove 101, and the interior of the connecting groove 4 21 is connected with a spring 22 fixed to the end of the stopper 105 away from the processing groove 101, and the set spring 22 can adjust the left and right movement of the stopper 105.

[0028] Working principle: When in use, the workpiece to be processed is placed on the lower mold, and then the hydraulic device 5 controls the support plate 6 to move upward. At this time, the lower mold 7 moves toward the direction of the upper mold 9. When it moves to a certain distance, the gas with heat is sprayed from the outlet pipe 111 through the gas source storage device 8, and then transported to the spiral pipe 114 through the arc transport pipe 113. The gas can heat the upper mold 9 when it is inside the arc transport pipe 113. The gas can heat the workpiece to be processed when it passes through the spiral pipe 114. The gas enters the heat conduction plate 2 14 through the spiral pipe 114, and then is introduced into the spiral pipe 2 117 to spirally transport the gas upward. After being transported to the air inlet pipe 115 through the arc transport pipe 2 116, the gas is re-heated. The gas enters the gas source storage device 8 for heating to ensure that the gas is always at a high temperature during the transportation process, so that the workpiece is fully heated. The hollow tube 15 and the hollow tube 2 17 are inserted into the sleeve 16 and the sleeve 2 18 connected to the ends of the spiral pipe 1 14 and the spiral pipe 2 117 when the lower mold 7 moves upward, realizing a gas circulation structure. The upper mold 9, the lower mold 7 and the workpiece are fully heated during the long-term circulation of the gas. The spiral pipe 1 14 and the spiral pipe 2 117 have the same spiral direction and are staggered up and down, which can not only increase the heating area, but also the spiral sealing structure composed of the spiral pipe 1 14 and the spiral pipe 2 117 can reduce the loss of heat. In order to make the workpiece heated more fully, during the pressing work, the lower mold 7 will move toward the upper mold 9, and at the beginning, the upper and lower parts of the workpiece will be pressed between the upper mold 9 and the lower mold 7, and then the hydraulic device 5 will continue to push the support plate 6 to move upward. At this time, the lower mold 7 will push the fully heated workpiece to be squeezed and deformed upward, and finally the lower mold 7 will contact the upper mold 9, and the workpiece will also become the shape of the aspheric optical lens to be processed, and the shape of the aspheric optical lens of different sizes can be changed by setting a detachable molding mold 106, or a plurality of molding molds 106 can be superimposed, and by setting molding grooves with gradually increasing sizes from the inside to the outside, the corresponding installation method can be selected according to the needs, and when installing the molding mold When the molding die 106 is installed, the protruding blocks 107 connected at both ends of the molding die 106 will squeeze the moving block 103 to move toward the direction of the spring 20, and then the molding die 106 can be successfully installed by blocking the protruding block 107 through the set stopper 105. When disassembling the molding die 106, it is only necessary to move the stopper 105 to both sides to compress the spring 22 to release the limit on the protruding block 107, and the molding die 106 can be disassembled. After the innermost molding die 106 is disassembled, the set moving block 103 will move toward the end face and be flush with the end faces of the upper mold 9 and the lower mold 7, and will compress the stopper 105 to the two ends of the connecting groove four 21. At this time, a larger molding groove will be formed, and a larger aspheric optical lens can be prepared.

[0029] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A high-precision aspheric optical lens pressing device, comprising a base plate (1), support seats (2) being installed at the four corners of the top of the base plate (1), a top seat (3) being installed on the top of the support seat (2), and a cross fixing frame (4) being installed on the inner side of the top seat (3), characterized in that: A hydraulic device (5) is installed at the top center of the base plate (1), a support plate (6) is connected to the top of the telescopic end of the hydraulic device (5), a lower mold (7) is installed on the top of the support plate (6), an air source storage device (8) is installed at the bottom of the cross fixing frame (4), an upper mold (9) is installed at the bottom center of the air source storage device (8), a replaceable processing component (10) is installed on the side of the lower mold (7) opposite to the upper mold (9), and a heat conduction mechanism (11) is arranged on the outer side of the upper mold (9).

2. A high-precision aspheric optical lens pressing device according to claim 1, characterized in that: Limit rods (12) are installed at the centers of the two ends of the top of the bottom plate (1), and the outer wall of the limit rod (12) is installed with limit seats (13) fixed to the two ends of the support plate (6).

3. The high-precision aspheric optical lens pressing device according to claim 1, characterized in that: The heat conduction mechanism (11) comprises an air outlet pipe (111) installed at one end of the bottom of the air source storage device (8); a heat conduction plate (112) is installed on the outer wall of the upper mold (9); an arc-shaped transport pipe (113) connected to the air outlet pipe (111) is penetrated through one end of the top of the heat conduction plate (112); the end of the arc-shaped transport pipe (113) is connected to a spiral pipe (114); the other end of the bottom of the air source storage device (8) is connected to an air inlet pipe (115); the bottom of the air inlet pipe (115) is connected to an arc-shaped transport pipe (116) penetrating the bottom of the heat conduction plate (112); the end of the arc-shaped transport pipe (116) is connected to a spiral pipe (117).

4. The high-precision aspheric optical lens pressing device according to claim 1, characterized in that: The outer wall of the lower mold (7) is provided with a heat conducting plate 2 (14), one end of the top of the heat conducting plate 2 (14) is connected to a hollow tube 1 (15), the end of the spiral pipe 1 (114) is connected to a sleeve 1 (16) matching with the hollow tube 1 (15), the other end of the top of the heat conducting plate 2 (14) is connected to a hollow tube 2 (17), and the end of the spiral pipe 2 (117) is connected to a sleeve 2 (18) matching with the hollow tube 2 (17).

5. The high-precision aspheric optical lens pressing device according to claim 3, characterized in that: The spiral pipe 1 (114) and the spiral pipe 2 (117) have the same spiral direction and are arranged alternately up and down.

6. The high-precision aspheric optical lens pressing device according to claim 1, characterized in that: The processing assembly (10) comprises a processing groove (101) provided at the center of one side opposite to the upper mold (9) and the lower mold (7); the two ends of the processing groove (101) are connected to a connecting groove 1 (102); a movable block (103) movable up and down is arranged inside the connecting groove 1 (102); the end of the connecting groove 1 (102) away from the processing groove (101) is connected to a connecting groove 2 (104); a stopper (105) movable left and right is arranged inside the connecting groove 2 (104); a forming mold (106) is installed inside the processing groove (101); and protruding blocks (107) arranged between the movable block (103) and the stopper (105) are installed at both ends of the forming mold (106).

7. A high-precision aspheric optical lens pressing device according to claim 6, characterized in that: The end of the connecting groove 1 (102) away from the end surface is connected to a connecting groove 3 (19), and the interior of the connecting groove 3 (19) is connected to a spring 1 (20) fixed to the end of the moving block (103) away from the end surface.

8. The high-precision aspheric optical lens pressing device according to claim 6, characterized in that: A connecting groove 4 (21) is provided at one end of the connecting groove 2 (104) away from the processing groove (101), and a spring 2 (22) fixed to one end of the stopper (105) away from the processing groove (101) is connected inside the connecting groove 4 (21).

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