Clamping mechanism for lens processing equipment

Abstract

The utility model belongs to the technical field of lens processing equipment, and particularly relates to a clamping mechanism for lens processing equipment, which comprises a worktable, a mounting frame is arranged on the upper surface of the worktable, and an electric guide rail is mounted below the mounting frame; through the arrangement of the inserting block and the two fixing assemblies, the elasticity of the first spring is utilized, after the inserting block is completely inserted into the inserting groove, the first spring can push the limiting block to reset, the limiting block is inserted into an inner cavity of a limiting hole in the inserting block, restraining on the inserting block is achieved, and therefore the purpose of rapid fixing is achieved; an opening communicated with a slot is formed in the upper surface of a mounting block, so that an operator can conveniently push two limiting blocks to the outer side so as to achieve the purpose of quick disassembly, a buffer assembly is arranged, excessive clamping force is absorbed and buffered through the elasticity of a second spring, and the situation that when two clamping mechanisms get close to each other, the two limiting blocks are separated from each other is avoided. And the lens cannot be released due to overlarge clamping force generated on the lens, so that irreversible damage to the lens main body is generated.

Description

Technical Field

[0001] The utility model belongs to the technical field of lens processing equipment, and particularly relates to a clamping mechanism for lens processing equipment. Background Art

[0002] Lenses are commonly used in movie cameras and projectors and are optical components for generating images. When processing lenses, they often need to be positioned and clamped by specific processing devices.

[0003] For example, the Chinese patent with the publication number CN214723034U discloses a lens processing positioning fixture, belonging to the technical field of processing and fixing equipment. The key points of its technical solution include a workbench, a debris collection mechanism, and an automatic adjustment mechanism. A placement box is fixedly installed at the bottom end surface of the workbench. Two through grooves are provided on the top end surface of the workbench. Closing plates are hinged at the tops of the two through grooves. Sliding grooves are opened on the top end surfaces of the two closing plates. A single-chip microcomputer is fixedly installed on the top end surface of the workbench. It can quickly and effectively collect the debris dropped during processing, and can also effectively prevent the lens from being damaged due to dropping, reducing unnecessary economic losses. It can automatically position and clamp, automatically and conveniently adjust the position of the lens to be processed and precisely control the clamping force, ensure stable clamping, prevent the lens from loosening and falling off during processing, and can freely adjust the height and clamping angle of the fixture, improving work efficiency and ensuring processing effect.

[0004] This patent has some disadvantages in use. For example, in this device, a specific U-shaped clamping block is used to clamp and position the lens. Since the clamping area of the U-shaped clamping block is relatively unique, the same type of clamping block can only clamp lenses that are adapted to match it. And this device is fixedly connected to the U-shaped clamping block through a connecting rod. When an operator needs to clamp and fix lenses of different models, the U-shaped clamping block cannot be quickly and effectively replaced. In view of this, we propose a clamping mechanism for lens processing equipment. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a clamping mechanism for lens processing equipment to solve the problems raised in the above background art.

[0006] In view of this, the utility model provides a clamping mechanism for lens processing equipment, including:

[0007] Workbench, an installation frame is arranged on the upper surface of the workbench, an electric guide rail is installed below the installation frame, sliding sleeves are symmetrically and slidably installed on the electric guide rail, an electric push rod is installed on the lower surface of the sliding sleeve, a fixed block is fixed at the bottom end of the telescopic rod of the electric push rod, an installation block is arranged inside the fixed block, a buffer box is arranged on one side of the installation block away from the fixed block, a C-shaped block is arranged on one side of the buffer box away from the fixed block, a clamping block is installed inside the C-shaped block, and an anti-slip soft pad is pasted on the outer wall of the clamping block;

[0008] Insert block, the insert block is fixed on the surface of the buffer box close to the installation block, a limit hole is opened on the insert block, and a slot for accommodating the insert block to insert is opened on the installation block;

[0009] Two fixing components, the two fixing components are symmetrically arranged and are both located in the inner cavity of the installation block and are used for fixing the insert block;

[0010] Buffer component, the buffer component is arranged in the buffer box and is used for buffering when the C-shaped block clamps the lens during processing, so as to avoid damage to the lens caused by a large clamping force.

[0011] In the above technical solution, further, support arms are fixed at both ends of the installation frame, and the bottom ends of the support arms are fixedly installed on the upper surface of the workbench through bolts.

[0012] In this technical solution, by setting the support arms, the two clamping mechanisms are conveniently fixed on the upper surface of the workbench.

[0013] In the above technical solution, further, a rotating groove with a cross-section in a T-shaped structure is opened in the fixed block, a rotating block is rotatably installed in the rotating groove, one end of the rotating block penetrates through the inner wall of the rotating groove and extends to the outside and is fixed with a connecting block, and the other side wall of the connecting block is fixed with the outer wall of the installation block.

[0014] In this technical solution, by setting the rotating block, the connecting block, the installation block and the inner clamping mechanism can rotate around the fixed block, which is convenient for the device to change the processing angle of the lens when clamping the lens.

[0015] In the above technical solution, further, a motor is fixedly installed on the outer side wall of one of the fixed blocks, and the rotating shaft of the motor is coaxially connected with the rotating block.

[0016] In this technical solution, by setting the motor and using the motor for driving, the labor consumption is saved.

[0017] In the above technical solution, further, the fixing component includes:

[0018] A sliding groove is provided on the inner side wall of the slot. A limiting block is slidably installed in the sliding groove, and the limiting block is inserted and matched with the limiting hole. A first spring is fixed between the limiting block and the sliding groove. The edge of the side of the limiting block close to the insertion block is inclined, and the two side edges of the end of the insertion block close to the installation block are provided with cutting surfaces that cooperate with the inclined surfaces on the limiting block.

[0019] In the above technical solution, further, positioning holes are symmetrically opened on the side wall of the end of the insertion block close to the installation block, and positioning columns are symmetrically fixed on the inner cavity wall of the slot. The positioning columns are inserted and matched with the corresponding positioning holes, and the positioning columns are in conformity with the positioning holes.

[0020] In this technical solution, by providing the positioning columns and the positioning holes, when the insertion block is inserted into the slot, it will not shake.

[0021] In the above technical solution, further, a groove is opened on the inner side wall of the clamping block, four pressure sensors are installed in the groove, a control panel is installed on the front side wall of the buffer box, and the four pressure sensors are electrically connected to the control panel.

[0022] In this technical solution, by providing the pressure sensors and the control panel, the pressure sensors are used to monitor the clamping force on the lens in real time, and the data obtained after monitoring is transmitted to the control panel and displayed, so as to avoid damage to the lens caused by a large extrusion force between the two clamping mechanisms.

[0023] In the above technical solution, further, the buffer assembly includes:

[0024] A sliding plate is slidably installed in the inner cavity of the buffer box. A connecting column is fixed on the side of the sliding plate close to the C-shaped block. One end of the connecting column penetrates the inner cavity wall of the buffer box and extends to the outside to be fixed to the surface of the C-shaped block. A second spring is provided on the side of the sliding plate away from the C-shaped block, and the two ends of the second spring are respectively fixed to the side wall of the sliding plate and the inner cavity wall of the buffer box.

[0025] The beneficial effects of the present utility model are:

[0026] 1. For the clamping mechanism of this lens processing equipment, by providing the insertion block and the two fixing components, using the elasticity of the first spring, after the insertion block is completely inserted into the slot, the first spring can push the limiting block to reset, and the limiting block is inserted into the inner cavity of the limiting hole on the insertion block, realizing the restraint of the insertion block, so as to achieve the goal of quick fixation. By opening an opening on the upper surface of the installation block that communicates with the slot, it is convenient for the operator to push the two limiting blocks outward, thus achieving the goal of quick disassembly.

[0027] 2. The clamping mechanism for the lens processing equipment, by setting a buffer component, utilizes the elasticity of the second spring to absorb and buffer excessive clamping force, avoiding that when the two clamping mechanisms approach each other, an excessive clamping force is generated on the lens and cannot be released, thus causing irreversible damage to the lens body. Brief Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0029] Figure 2 It is a schematic diagram of the structure of two clamping mechanisms in the present utility model;

[0030] Figure 3 It is a schematic cross-sectional view of the fixed block in the present utility model;

[0031] Figure 4 It is a schematic cross-sectional view of the fixing component in the present utility model;

[0032] Figure 5 It is a schematic diagram of the structure of the buffer component in the present utility model.

[0033] The labels in the figure are shown as:

[0034] 1. Workbench; 2. Installation frame; 3. Electric guide rail; 4. Sliding sleeve; 5. Electric push rod; 6. Fixed block; 7. Rotating groove; 8. Rotating block; 9. Connecting block; 10. Installation block; 11. Buffer box; 12. Insert block; 13. Limit hole; 14. Slot; 15. Slide groove; 16. Limit block; 17. First spring; 18. Positioning column; 19. Positioning hole; 20. C-shaped block; 21. Clamping block; 22. Anti-slip soft pad; 23. Groove; 24. Pressure sensor; 25. Control panel; 26. Sliding plate; 27. Connecting column; 28. Second spring; 29. Motor. Detailed Embodiment

[0035] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0036] In the description of the present application, it should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but in appropriate cases, the techniques, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0038] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0039] It should be noted that in this application, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising that element. In addition, it should be noted that the scope of the methods and devices in the embodiments of this application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0040] Embodiment 1:

[0041] Please refer to Figure 1 - Figure 5 as shown, this embodiment provides a clamping mechanism for a lens processing device, including:

[0042] A workbench 1, on the upper surface of the workbench 1, there is an installation frame 2. Below the installation frame 2, there is an electric guide rail 3. On the electric guide rail 3, there are symmetrically slidingly installed sliding sleeves 4. On the lower surface of the sliding sleeve 4, there is an electric push rod 5. The bottom end of the telescopic rod of the electric push rod 5 is fixed with a fixing block 6. Inside the fixing block 6, there is an installation block 10. On the side of the installation block 10 away from the fixing block 6, there is a buffer box 11. On the side of the buffer box 11 away from the fixing block 6, there is a C-shaped block 20. Inside the C-shaped block 20, there is a clamping block 21. On the outer wall of the clamping block 21, there is an anti-slip soft pad 22;

[0043] An insertion block 12, the insertion block 12 is fixed on the surface of the buffer box 11 close to the installation block 10. On the insertion block 12, there is a limit hole 13. On the installation block 10, there is a slot 14 that can accommodate the insertion of the insertion block 12;

[0044] Two fixing components, the two fixing components are symmetrically arranged and are both located in the inner cavity of the installation block 10 and are used to fix the insertion block 12;

[0045] A buffer component, the buffer component is arranged in the buffer box 11 and is used to buffer the C-shaped block 20 during the clamping of the lens processing to avoid damage to the lens caused by a large clamping force;

[0046] In this embodiment, the fixing component includes:

[0047] The chute 15 is opened on the inner side wall of the slot 14. A limiting block 16 is slidably installed in the chute 15, and the limiting block 16 is inserted and matched with the limiting hole 13. A first spring 17 is fixed between the limiting block 16 and the chute 15. The edge of the limiting block 16 close to the insertion block 12 is inclined. On both sides of the end of the insertion block 12 close to the mounting block 10, there are cut surfaces that cooperate with the inclined surfaces on the limiting block 16;

[0048] In this embodiment, the buffer assembly includes:

[0049] The sliding plate 26 is slidably installed in the inner cavity of the buffer box 11. A connecting column 27 is fixed on the side of the sliding plate 26 close to the U-shaped block 20. One end of the connecting column 27 penetrates the inner cavity wall of the buffer box 11 and extends to the outside to be fixed to the outer wall of the U-shaped block 20. A second spring 28 is arranged on the side of the sliding plate 26 away from the U-shaped block 20, and both ends of the second spring 28 are respectively fixed to the side wall of the sliding plate 26 and the inner cavity wall of the buffer box 11.

[0050] Among them, the working principle of this device is as follows:

[0051] When in use, place the lens between the two clamping mechanisms. At this time, start the electric guide rail 3. The two sliding sleeves 4 on the electric guide rail 3 slide slowly towards the central position at the same time, and drive the clamping mechanisms below to move closer to the central position and clamp the lens. When the anti-slip soft pad 22 contacts the lens, the lens generates a reaction force on the anti-slip soft pad 22, the clamping block 21 and the U-shaped block 20, and makes the buffer assembly start to work. When the buffer assembly works, the U-shaped block 20 squeezes the sliding plate 26 outward through the connecting column 27, so that the sliding plate 26 slides outward on the inner side of the inner cavity of the buffer box 11 and squeezes the second spring 28. The buffer is carried out through the elasticity of the second spring 28, so as to avoid that when the two clamping mechanisms approach each other, an excessive clamping force is generated on the lens and cannot be released, thereby causing irreversible damage to the lens body. At this time, the four pressure sensors 24 receive the squeezing force on the lens and transmit the squeezing force on this side to the corresponding control panel 25. The operator observes the control panel 25 to ensure that the lens is in a proper and stable clamping range. It should be noted that the four pressure sensors 24 and the control panel 25 in this application are wired by a four-bridge wiring method, which is the prior art and will not be elaborated in this application;

[0052] When the U-shaped block 20 needs to be replaced, the operator toggles the two limit blocks 16 outward, so that the limit blocks 16 no longer insert into the limit holes 13. At this time, the limit blocks 16 lose the restraint on the insert block 12. Then, the operator can pull out the buffer box 11 from the mounting block 10 toward the side away from the mounting block 10 to replace the U-shaped block 20. It is worth adding that the U-shaped block 20 and the clamping block 21 are fixed by bolts. When disassembling, the buffer box 11 can be preliminarily disassembled from the workbench 1 first, that is, as described above, and then the U-shaped block 20 can be disassembled at a suitable place to avoid the inconvenience for the operator to exert force and operate when directly disassembling the U-shaped block 20 on the workbench 1. In addition, an opening is provided on the upper surface of the mounting block 10. As shown in the Figure 3 instruction manual appendix, the operator can control the two limit blocks 16 to slide outward at the opening.

[0053] By setting the insert block 12 and the two fixing components, using the elasticity of the first spring 17, after the insert block 12 is completely inserted into the slot 14, the first spring 17 can push the limit block 16 to reset, and make the limit block 16 insert into the inner cavity of the limit hole 13 on the insert block 12 to realize the restraint on the insert block 12, so as to achieve the goal of quick fixation. By providing an opening on the upper surface of the mounting block 10 that communicates with the slot 14, it is convenient for the operator to push the two limit blocks 16 outward, so as to achieve the goal of quick disassembly; by setting the buffer component, using the elasticity of the second spring 28 to absorb and buffer excessive clamping force, to avoid that when the two clamping mechanisms approach each other, they generate too much clamping force on the lens and cannot be released, thus causing irreversible damage to the lens body.

[0054] Embodiment 2:

[0055] This embodiment provides a clamping mechanism for a lens processing device. In addition to including the technical solutions of the above embodiments, it also has the following technical features. Support arms are fixed at both ends of the mounting frame 2, and the bottom ends of the support arms are fixedly installed on the upper surface of the workbench 1 by bolts.

[0056] Among them, by setting the support arms, the two clamping mechanisms are convenient to be fixed on the upper surface of the workbench 1.

[0057] Embodiment 3:

[0058] This embodiment provides a clamping mechanism for a lens processing device. In addition to including the technical solutions of the above embodiments, it also has the following technical features. A rotating groove 7 with a cross-section in a T-shaped structure is opened in the fixed block 6. A rotating block 8 is rotatably installed in the rotating groove 7. One end of the rotating block 8 penetrates through the inner wall of the rotating groove 7 and extends to the outside and is fixed with a connecting block 9. The other side wall of the connecting block 9 is fixed to the outer wall of the mounting block 10.

[0059] Among them, by setting the rotating block 8, the connecting block 9, the mounting block 10 and the inner clamping mechanism can rotate on the right side of the fixed block 6, so that the device can change the processing angle of the lens when clamping the lens.

[0060] Embodiment 4:

[0061] This embodiment provides a clamping mechanism for lens processing equipment. In addition to the technical solutions of the above-mentioned embodiments, it also has the following technical features, wherein a motor 29 is fixedly mounted on the outer wall of a fixed block 6, and the rotating shaft of the motor 29 is coaxially connected to the rotating block 8.

[0062] Among them, by providing the motor 29 and utilizing the motor 29 for driving, manpower consumption is saved.

[0063] Embodiment 5:

[0064] The present embodiment provides a clamping mechanism for lens processing equipment. In addition to the technical solutions of the above-mentioned embodiments, it also has the following technical features: positioning holes 19 are symmetrically opened on the side wall of one end of the plug block 12 close to the mounting block 10, and positioning columns 18 are symmetrically fixed on the inner cavity wall of the slot 14. The positioning columns 18 are plugged into and matched with the corresponding positioning holes 19, and the positioning columns 18 are consistent with the positioning holes 19.

[0065] The positioning column 18 and the positioning hole 19 are provided so that the insert block 12 will not shake when inserted into the slot 14 .

[0066] Embodiment 6:

[0067] The present embodiment provides a clamping mechanism for lens processing equipment. In addition to the technical solutions of the above-mentioned embodiments, it also has the following technical features: a groove 23 is provided on the inner wall of the clamping block 21, four pressure sensors 24 are installed in the groove 23, a control panel 25 is installed on the front wall of the buffer box 11, and the four pressure sensors 24 are electrically connected to the control panel 25.

[0068] Among them, by setting up a pressure sensor 24 and a control panel 25, the pressure sensor 24 is used to monitor the clamping force on the lens in real time, and the data obtained after monitoring is transmitted to the control panel 25 and displayed, so as to avoid damage to the lens caused by a large squeezing force between the two clamping mechanisms.

[0069] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A clamping mechanism for lens processing equipment, characterized in that: Including: A workbench (1), on the upper surface of the workbench (1) there is an installation frame (2), below the installation frame (2) there is an electric guide rail (3) installed, on the electric guide rail (3) there are sliding sleeves (4) symmetrically installed, on the lower surface of the sliding sleeve (4) there is an electric push rod (5) installed, at the bottom end of the telescopic rod of the electric push rod (5) there is a fixed block (6) fixed, inside the fixed block (6) there is an installation block (10) arranged, on the side of the installation block (10) far from the fixed block (6) there is a buffer box (11) arranged, on the side of the buffer box (11) far from the fixed block (6) there is a U-shaped block (20) arranged, inside the U-shaped block (20) there is a clamping block (21) installed, and on the outer wall of the clamping block (21) there is an anti-slip soft pad (22) pasted; An insertion block (12), the insertion block (12) is fixed on the surface wall of the buffer box (11) on the side close to the installation block (10), on the insertion block (12) there is a limit hole (13) opened, and on the installation block (10) there is a slot (14) opened that can accommodate the insertion of the insertion block (12); Two fixing components, the two fixing components are symmetrically arranged and are both located in the inner cavity of the installation block (10), and are used for fixing the insertion block (12); A buffer component, the buffer component is arranged inside the buffer box (11), and is used for buffering when the U-shaped block (20) clamps the lens during lens processing, to avoid damage to the lens caused by a large clamping force.

2. A clamping mechanism for lens processing equipment according to claim 1, characterized in that: At both ends of the installation frame (2) there are support arms fixed, and the bottom ends of the support arms are fixedly installed on the upper surface of the workbench (1) through bolts.

3. The clamping mechanism for lens processing equipment according to claim 1, characterized in that: Inside the fixed block (6) there is a rotating groove (7) with a cross-section in a T-shaped structure, inside the rotating groove (7) there is a rotating block (8) rotatably installed, one end of the rotating block (8) penetrates through the inner wall of the rotating groove (7) and extends to the outside and is fixed with a connecting block (9), and the other side wall of the connecting block (9) is fixed with the outer wall of the installation block (10).

4. The clamping mechanism for lens processing equipment according to claim 3, characterized in that: On the outer side wall of one of the fixed blocks (6) there is a motor (29) fixedly installed, and the rotating shaft of the motor (29) is coaxially connected with the rotating block (8).

5. The clamping mechanism for lens processing equipment according to claim 1, characterized in that: The fixing component includes: A sliding groove (15), the sliding groove (15) is opened on the inner side wall of the slot (14), inside the sliding groove (15) there is a limit block (16) slidably installed, and the limit block (16) is inserted and matched with the limit hole (13), between the limit block (16) and the sliding groove (15) there is a first spring (17) fixed, the edge of the side of the limit block (16) close to the insertion block (12) is inclined, and on both sides of the end of the insertion block (12) close to the installation block (10) there are cut surfaces that cooperate with the inclined surfaces on the limit block (16).

6. The clamping mechanism for lens processing equipment according to claim 5, characterized in that: On the side wall of the end of the insertion block (12) close to the installation block (10) there are positioning holes (19) symmetrically opened, on the inner cavity wall of the slot (14) there are positioning columns (18) symmetrically fixed, the positioning columns (18) are inserted and matched with the corresponding positioning holes (19), and the positioning columns (18) are coincident with the positioning holes (19).

7. The clamping mechanism for lens processing equipment according to claim 1, characterized in that: The inner side wall of the clamping block (21) is provided with a groove (23), and four pressure sensors (24) are installed in the groove (23). A control panel (25) is installed on the front side wall of the buffer box (11), and the four pressure sensors (24) are electrically connected to the control panel (25).

8. The clamping mechanism for lens processing equipment according to claim 1, characterized in that: The buffer assembly includes: A sliding plate (26) which is slidably installed in the inner cavity of the buffer box (11). A connecting column (27) is fixed on the side of the sliding plate (26) close to the U-shaped block (20). One end of the connecting column (27) penetrates through the inner cavity wall of the buffer box (11) and extends to the outside to be fixed to the surface wall of the U-shaped block (20). A second spring (28) is arranged on the side of the sliding plate (26) away from the U-shaped block (20), and both ends of the second spring (28) are respectively fixed to the side wall of the sliding plate (26) and the inner cavity wall of the buffer box (11).

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