Shock absorption structure of vibration polishing machine
By combining a limiting protrusion, a fixing pin, and a shock-absorbing spring, the problem of polishing machine displacement caused by bolt detachment is solved, achieving stable fixation and shock absorption of the vibratory polishing machine.
Patent Information
- Application Number
- CN202423274793.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Existing vibratory polishing machines generate periodic external forces during operation due to bolted connections, causing minute relative movements between the bolts and the ground surfaces, resulting in bolt detachment and polishing machine displacement.
It adopts a combination structure of limiting protrusion, fixing pin, limiting rope and shock-absorbing spring. The limiting protrusion abuts against the polishing machine base, the fixing pin is inserted into the ground hole, the limiting rope is fixed, and the shock-absorbing spring absorbs vibration energy to prevent the bolt from coming loose.
It effectively reduces the transmission of vibration to the fixing bolts, prevents bolt detachment, ensures the long-term positioning of the polishing machine base, and improves the stability and shock absorption effect of the vibratory polishing machine.
Smart Images

Figure CN223589088U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of glass bottle mold processing, and in particular to a vibration damping structure for a vibratory polishing machine. Background Technology
[0002] Molds used for producing glass bottles typically require high precision and a good surface finish. Therefore, the surface needs to be ground and polished to achieve the desired finish. Vibratory polishing machines are usually used for polishing. When the mold is placed in the grinding chamber of the vibratory polishing machine, the machine is started. The vibration and the impact force of the grinding media (polishing particles) are used to achieve processes such as deburring, removing oxide layers, polishing, and cleaning of the mold surface.
[0003] Vibratory polishing machines typically use eccentric motors or motors with eccentric counterweights to generate vibration. Therefore, vibratory polishing machines produce significant vibrations during operation. The base of existing vibratory polishing machines is fixed to the ground with bolts. Since the preload between the bolts and the holes in the ground is mainly maintained by the friction between the threads, continuous vibration is transmitted to the bolts, causing periodic external forces to be generated in the bolt connection. These external forces will produce slight relative movements between the bolts and the holes in the ground, which can cause the bolts to come loose and result in the vibratory polishing machine shifting. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model provides a shock-absorbing structure for a vibratory polishing machine. The purpose is to solve the technical problem that the periodic external forces generated by bolt connections will cause slight relative movement between the bolts and the holes in the ground, resulting in bolt detachment and displacement of the vibratory polishing machine.
[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:
[0006] A vibration damping structure for a vibratory polishing machine includes a fixed frame with an internal cavity. Multiple limiting protrusions are located within the cavity, their bottoms forming a first limiting interval with the ground. This first limiting interval accommodates the base of the vibratory polishing machine, causing the protrusions to abut against the top of the base. Multiple fixing pins are located at the bottom of the fixed frame, engaging with holes in the ground. A limiting rope is located at the bottom of each pin and fixed to the hole in the ground. Multiple piston cylinders are located along the outer edge of the fixed frame, each with an internal movable cavity. A damping spring is located within the movable cavity, with a piston rod at one end that slides within the cavity. A fixing seat is located at the other end of the piston rod, with a fixing hole inside. A fixing bolt passes through the fixing hole, its protruding end engaging with a threaded hole in the ground.
[0007] During installation, the base of the vibratory polisher is positioned within the first limiting interval, causing multiple limiting protrusions to abut against the top of the base. Fixing bolts pass through the fixing holes inside the fixing seat and engage with the threaded holes in the ground. Since the fixing seat is connected to the fixing frame via a piston rod and piston cylinder, the position of the fixing frame is fixed. To reduce lateral and vertical swaying of the fixing frame, fixing pins are inserted into the holes in the ground, limiting the lateral movement of the fixing frame. A limiting rope is fixed inside the holes in the ground, limiting the vertical movement of the fixing frame. When the vibration of the vibratory polisher is transmitted to the fixing frame, the vibration is transmitted to the piston cylinder, causing the piston cylinder and piston rod to move. Because the piston cylinder contains damping springs, these springs absorb and buffer vibration energy, thus reducing vibration and preventing large vibrations from being directly transmitted to the fixing bolts. This prevents the fixing bolts from coming loose due to vibration, allowing the base of the vibratory polisher to remain in a long-term limited position.
[0008] Furthermore, in this application, the bottom of the limiting protrusion is provided with a limiting block, and the limiting blocks of the plurality of limiting protrusions surround each other to form a second limiting interval. The second limiting interval is used to accommodate the base of the vibratory polishing machine, so that the plurality of limiting blocks abut against the outer edge of the base of the vibratory polishing machine.
[0009] The limiting rope can be fixed to the hole in the ground by anchor bolts. Since it is a non-threaded connection, this fixing method is not easy to come loose under vibration. If the fixing seat is not fixed by fixing bolts and the fixing frame is fixed by the limiting rope only, the vibration polishing machine will shake a lot.
[0010] Furthermore, in this application, the bottom of the limiting protrusion is provided with a first fastening plate, the first fastening plate is elastic, and the first fastening plate is used to abut against the top of the base of the vibratory polishing machine.
[0011] Multiple limiting blocks surround to form a second limiting interval, which can better limit the outer edge of the base of the vibratory polisher. During the vibration process, the lateral displacement of the base of the vibratory polisher is directly blocked by the limiting blocks, while the limiting protrusion blocks the vertical movement of the base of the vibratory polisher. This achieves dual positioning of the base both vertically and along its outer edge, thereby avoiding the problem of displacement or shaking caused by vibration.
[0012] Furthermore, in this application, a second fastening plate is provided on one side of the limiting block. The second fastening plate is elastic and is used to abut against the outer edge of the base of the vibratory polishing machine.
[0013] Furthermore, in this application, the bottom of the fixing pin is provided with a fixing ring, and one end of the limiting rope is tied to the fixing ring.
[0014] Furthermore, in this application, a fastening sleeve is provided on the outside of the fixing pin, the fastening sleeve is elastic, and the fastening sleeve engages with a hole in the ground.
[0015] Furthermore, in this application, a guide groove is provided inside the movable cavity, and a guide slider is provided on the outer edge of the piston rod, with the guide slider slidingly engaged with the guide groove.
[0016] Furthermore, in this application, the top of the fixing seat is provided with a fastening washer, the fastening washer is elastic, and the fixing bolt passes through the interior of the fastening washer, so that the nut of the fixing bolt abuts against the fastening washer.
[0017] Furthermore, in this application, the interior of the movable cavity is provided with a first mounting post, which is internally inserted into the other end of the shock-absorbing spring, and one end of the piston rod is provided with a second mounting post, which is internally inserted into one end of the shock-absorbing spring.
[0018] Furthermore, in this application, the first mounting post has first locking protrusions on both sides, and the first locking protrusions on both sides of the first mounting post are internally engaged with the other end of the shock-absorbing spring. The second mounting post has second locking protrusions on both sides, and the second locking protrusions on both sides of the second mounting post are internally engaged with one end of the shock-absorbing spring.
[0019] This utility model has the following beneficial effects:
[0020] During installation, the base of the vibratory polisher is positioned within the first limiting interval, causing multiple limiting protrusions to abut against the top of the base. Fixing bolts pass through the fixing holes inside the fixing seat and engage with the threaded holes in the ground. Since the fixing seat is connected to the fixing frame via a piston rod and piston cylinder, the position of the fixing frame is fixed. To reduce lateral and vertical swaying of the fixing frame, fixing pins are inserted into the holes in the ground, limiting the lateral movement of the fixing frame. A limiting rope is fixed inside the holes in the ground, limiting the vertical movement of the fixing frame. When the vibration of the vibratory polisher is transmitted to the fixing frame, the vibration is transmitted to the piston cylinder, causing the piston cylinder and piston rod to move. Because the piston cylinder contains damping springs, these springs absorb and buffer vibration energy, thus reducing vibration and preventing large vibrations from being directly transmitted to the fixing bolts. This prevents the fixing bolts from coming loose due to vibration, allowing the base of the vibratory polisher to remain in a long-term limited position. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of this utility model.
[0022] Figure 2 This is a structural schematic diagram of the fixing base of this utility model.
[0023] Figure 3 This is a schematic diagram of the fastening sleeve of this utility model.
[0024] Figure 4 This is a schematic diagram of the limiting block of this utility model.
[0025] Figure 5 This is a structural schematic diagram of the first limiting interval and the second limiting interval of this utility model.
[0026] Figure 6 This is a structural schematic diagram of the fixing base of this utility model.
[0027] Figure 7 This is a structural schematic diagram of the shock-absorbing spring of this utility model.
[0028] In the attached figures, the following labels are used:
[0029] 1. Fixing frame; 2. Receiving cavity; 3. Limiting protrusion; 4. Limiting block; 5. First limiting interval; 6. First fastening plate; 7. Second fastening plate; 8. Fixing pin; 9. Fixing ring; 10. Piston cylinder; 11. Movable cavity; 12. Guide groove; 13. Shock-absorbing spring; 14. Piston rod; 15. First mounting post; 16. Guide slider; 17. Fixing seat; 18. Fixing hole; 19. Fastening washer; 20. Fixing bolt; 21. Second limiting interval; 22. Fastening sleeve; 23. Second mounting post; 24. First locking protrusion; 25. Second locking protrusion; 26. Limiting rope. Detailed Implementation
[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0031] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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 should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0033] Reference Figures 1-7In some specific embodiments, a vibration damping structure for a vibratory polishing machine includes a fixed frame 1. The fixed frame 1 has an internal cavity 2, and the cavity 2 contains multiple limiting protrusions 3. The bottoms of the multiple limiting protrusions 3 are spaced from the ground to form a first limiting interval 5, which accommodates the base of the vibratory polishing machine, causing the multiple limiting protrusions 3 to abut against the top of the base. The bottom of the fixed frame 1 has multiple fixing pins 8, which are inserted into holes in the ground. The bottom of each fixing pin 8 has a limiting rope 26. The limiting rope 26 is fixed to the hole in the ground. The outer edge of the fixing frame 1 is provided with multiple piston cylinders 10. The piston cylinder 10 has a movable cavity 11 inside. The movable cavity 11 is provided with a shock-absorbing spring 13. One end of the shock-absorbing spring 13 is provided with a piston rod 14. One end of the piston rod 14 is slidably engaged with the movable cavity 11. The other end of the piston rod 14 is provided with a fixing seat 17. The fixing seat 17 has a fixing hole 18 inside. A fixing bolt 20 passes through the fixing hole 18. The protruding end of the fixing bolt 20 is used to engage with the hole in the ground.
[0034] With the above technical solution, when the mounting bracket 1 is installed, the base of the vibratory polisher is located within the first limiting interval 5, causing multiple limiting protrusions 3 to abut against the top of the base of the vibratory polisher. Then, fixing bolts 20 pass through the fixing holes 18 inside the fixing seat 17 and threadedly engage with the holes in the ground. The fixing seat 17 is connected to the mounting bracket 1 via piston rod 14 and piston cylinder 10, thereby fixing the position of the mounting bracket 1. To reduce the lateral and vertical swaying of the mounting bracket 1, fixing pins 8 are inserted into the holes in the ground. The fixing pins 8 limit the lateral movement of the mounting bracket 1, while the limiting rope 2... 6. The hole in the ground is fixed inside, so that the limiting rope 26 limits the vertical direction of the fixed frame 1. When the vibration of the vibratory polisher is transmitted to the fixed frame 1, the vibration of the fixed frame 1 will be transmitted to the piston cylinder 10. The vibration will drive the piston cylinder 10 and the piston rod 14 to perform piston movement. Since the piston cylinder 10 is equipped with a shock-absorbing spring 13, the shock-absorbing spring 13 can absorb and buffer the vibration energy, thereby realizing the vibration reduction and preventing large vibrations from being directly transmitted to the fixing bolt 20. This avoids the fixing bolt 20 from coming off due to vibration, so that the base of the vibratory polisher can remain in a limited state for a long time.
[0035] It should be noted that the limiting rope 26 can be fixed to the hole in the ground by anchor bolts. Since a non-threaded connection is used, this fixing method is not easy to come loose under vibration. However, if the fixing seat 17 is not fixed by fixing bolts 20 and the fixing frame 1 is fixed by only using the limiting rope 26, the base of the vibratory polishing machine will shake more.
[0036] In addition, the limiting rope 26 can be made of high-strength steel wire rope or other wear-resistant materials to meet the requirements of long-term vibration environment; the design of the limiting protrusion 3 can be further optimized into a flexible material covering form to reduce the direct impact between the base of the vibratory polishing machine and the limiting structure.
[0037] Reference Figures 1-5 In some specific embodiments, the bottom of the limiting protrusion 3 is provided with a limiting block 4, and the limiting blocks 4 of multiple limiting protrusions 3 surround each other to form a second limiting interval 21. The second limiting interval 21 is used to accommodate the base of the vibratory polishing machine, so that the multiple limiting blocks 4 abut against the outer edge of the base of the vibratory polishing machine.
[0038] Through the above technical solution, multiple limiting blocks 4 surround to form a second limiting interval 21. This second limiting interval 21 can better limit the outer edge of the base of the vibratory polishing machine, so that during the vibration process, the lateral displacement of the base of the vibratory polishing machine is directly blocked by the limiting blocks 4, while the limiting protrusion 3 blocks the vertical movement of the base of the vibratory polishing machine, realizing dual positioning of the base in both vertical and lateral directions, thereby avoiding the problem of large-scale shaking caused by vibration.
[0039] Reference Figures 1-5 In some specific embodiments, the bottom of the limiting protrusion 3 is provided with a first fastening plate 6, the first fastening plate 6 is elastic, and the first fastening plate 6 is used to abut against the top of the base of the vibratory polishing machine.
[0040] Through the above technical solution, the elastic characteristics of the first fastening plate 6 allow it to adapt to the dynamic vibration of the base of the vibratory polishing machine during operation, so that the first fastening plate 6 can absorb some energy when the vibration is transmitted, reduce the impact of vibration on the connection between the base of the vibratory polishing machine and the limiting protrusion 3, avoid damage to the base of the vibratory polishing machine or the limiting protrusion 3, and further improve the shock absorption performance.
[0041] Reference Figures 1-5 In some specific embodiments, a second fastening plate 7 is provided on one side of the limiting block 4. The second fastening plate 7 is elastic and is used to abut against the outer edge of the base of the vibratory polishing machine.
[0042] Through the above technical solution, the second fastening plate 7 is set on one side of the limiting block 4. By abutting against the outer edge of the base of the vibratory polishing machine, it provides elastic buffer for the lateral support of the base of the vibratory polishing machine. When the vibration is transmitted to the outer edge of the base, the second fastening plate 7 can effectively absorb the vibration energy and reduce the direct impact of the vibration on the limiting block 4 and the outer edge of the base. Combined with the support function of the limiting block 4, the second fastening plate 7 further improves the fixed stability of the base of the vibratory polishing machine and prevents the base from shifting or displacing due to lateral vibration.
[0043] Reference Figures 1-7 In some specific embodiments, a fixing ring 9 is provided at the bottom of the fixing pin 8, and one end of the limiting rope 26 is tied to the fixing ring 9.
[0044] Through the above technical solution, by setting a fixing ring 9 at the bottom of the fixing pin 8, one end of the limiting rope 26 can be firmly connected to the fixing pin 8 by binding, forming an independent fixing point, effectively avoiding the problem of the limiting rope 26 falling off or loosening during vibration transmission.
[0045] Reference Figure 1 In some specific embodiments, a fastening sleeve 22 is provided on the outside of the fixing pin 8. The fastening sleeve 22 is elastic and engages with the hole in the ground.
[0046] Through the above technical solution, the fastening sleeve 22 sleeved on the outside of the fixed pin 8, through its elastic properties, forms a tight engagement with the hole wall after being inserted into the ground hole position, which enhances the connection stability between the fixed pin 8 and the ground. In addition, the fastening sleeve 22 can absorb part of the energy transmitted to the fixed pin 8 by vibration, buffer the direct impact of vibration on the ground hole position, and reduce the wear and loosening problems of the hole position caused by long-term vibration.
[0047] Reference Figures 6-7 In some specific embodiments, a guide groove 12 is provided inside the movable cavity 11, and a guide slider 16 is provided on the outer edge of the piston rod 14, with the guide slider 16 slidingly engaged with the guide groove 12.
[0048] Through the above technical solution, during the piston movement of the piston rod 14, the guide groove 12 restricts the movement direction of the piston rod 14, avoiding the piston rod 14 from deflection or jamming caused by vibration; through the sliding cooperation between the guide slider 16 and the guide groove 12, it is ensured that the piston rod 14 maintains linear movement during the shock absorption process, while reducing the direct friction between the piston rod 14 and the inner wall of the movable cavity 11, thereby improving the smoothness of movement and the shock absorption effect.
[0049] Reference Figures 1-7 In some specific embodiments, the top of the fixing seat 17 is provided with a fastening washer 19. The fastening washer 19 is elastic, and the fixing bolt 20 passes through the inside of the fastening washer 19, so that the nut of the fixing bolt 20 abuts against the fastening washer 19.
[0050] Through the above technical solution, the fastening washer 19 is set on the top of the fixing seat 17. Through its elastic properties, it provides buffer support for the nut when the fixing bolt 20 is tightened. When vibration is transmitted to the fixing bolt 20, the fastening washer 19 can absorb some vibration energy and reduce the direct impact between the bolt and the ground hole. This design effectively avoids the problem of nut loosening or ground hole wear caused by excessive vibration force, and at the same time improves the fatigue resistance of the entire shock absorption structure.
[0051] Reference Figures 6-7 In some specific embodiments, the movable cavity 11 is provided with a first mounting post 15, which is internally inserted into the other end of the shock-absorbing spring 13, and a second mounting post 23 is provided at one end of the piston rod 14, which is internally inserted into one end of the shock-absorbing spring 13.
[0052] Through the above technical solution, the shock-absorbing spring 13 is fixed by being inserted into the first mounting post 15 and the second mounting post 23 at both ends to form a stable support structure. When the vibratory polishing machine is running, the shock-absorbing spring 13 is compressed and restored under the drive of the piston rod 14. The positioning of the first mounting post 15 and the second mounting post 23 ensures that the spring is subjected to uniform force and the direction of movement is stable, avoiding the problem of the spring shifting or falling off due to vibration.
[0053] Reference Figures 6-7 In some specific embodiments, the first mounting post 15 is provided with first locking protrusions 24 on both sides, and the first locking protrusions 24 on both sides of the first mounting post 15 are internally engaged with the other end of the shock-absorbing spring 13. The second mounting post 23 is provided with second locking protrusions 25 on both sides, and the second locking protrusions 25 on both sides of the second mounting post 23 are internally engaged with one end of the shock-absorbing spring 13.
[0054] Through the above technical solution, the first mounting post 15 and the second mounting post 23 are respectively provided with a first locking protrusion 24 and a second locking protrusion 25 on both sides, which further enhances the fixing stability of the shock-absorbing spring 13 through the locking method; when the vibratory polishing machine is running, the shock-absorbing spring 13 maintains a stable plugging state when driven by the piston rod 14 or when vibration is transmitted, avoiding the spring from detaching or shifting from the mounting post due to vibration; the design of the first locking protrusion 24 and the second locking protrusion 25 can not only provide multi-point support, but also disperse vibration stress, ensuring that the movement direction of the shock-absorbing spring 13 during vibration is controlled, and improving the reliability of the shock absorption system.
[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
Claims
1. A vibration damping structure for a vibratory polishing machine, characterized in that, The device includes a fixed frame with an internal cavity containing multiple limiting protrusions. The bottoms of these protrusions are spaced apart from the ground to form a first limiting interval, which accommodates the base of a vibratory polisher. The protrusions abut against the top of the base. The bottom of the fixed frame has multiple fixing pins that engage with holes in the ground. A limiting rope is attached to the bottom of each pin and fixed to the hole in the ground. The outer edge of the fixed frame has multiple piston cylinders with internal movable cavities. Each movable cavity contains a shock-absorbing spring with a piston rod at one end. One end of the piston rod slides within the movable cavity, and the other end has a fixing seat with a fixing hole. A fixing bolt passes through the fixing hole and its protruding end engages with a hole in the ground.
2. The vibration damping structure of a vibratory polishing machine according to claim 1, characterized in that, The bottom of the limiting protrusion is provided with a limiting block, and the limiting blocks of the multiple limiting protrusions surround each other to form a second limiting interval. The second limiting interval is used to accommodate the base of the vibratory polishing machine, so that the multiple limiting blocks abut against the outer edge of the base of the vibratory polishing machine.
3. The vibration damping structure of a vibratory polishing machine according to claim 2, characterized in that, The bottom of the limiting protrusion is provided with a first fastening plate, which is elastic and is used to abut against the top of the base of the vibratory polishing machine.
4. The vibration damping structure of a vibratory polishing machine according to claim 3, characterized in that, A second fastening plate is provided on one side of the limiting block. The second fastening plate is elastic and is used to abut against the outer edge of the base of the vibratory polishing machine.
5. The vibration damping structure of a vibratory polishing machine according to claim 1, characterized in that, The bottom of the fixing pin is provided with a fixing ring, and one end of the limiting rope is tied to the fixing ring.
6. The vibration damping structure of a vibratory polishing machine according to claim 5, characterized in that, The fixing pin is fitted with a fastening sleeve, which is elastic and engages with a hole in the ground.
7. The vibration damping structure of a vibratory polishing machine according to claim 1, characterized in that, The movable cavity has a guide groove inside, and the piston rod has a guide slider on its outer edge, with the guide slider slidingly engaging with the guide groove.
8. The vibration damping structure of a vibratory polishing machine according to claim 1, characterized in that, The top of the fixing seat is provided with a fastening washer, which is elastic. The fixing bolt passes through the inside of the fastening washer, so that the nut of the fixing bolt abuts against the fastening washer.
9. The vibration damping structure of a vibratory polishing machine according to claim 1, characterized in that, The movable cavity is provided with a first mounting post, which is inserted into the other end of the shock-absorbing spring. One end of the piston rod is provided with a second mounting post, which is inserted into one end of the shock-absorbing spring.
10. The vibration damping structure of a vibratory polishing machine according to claim 9, characterized in that, The first mounting post has first locking protrusions on both sides, and the first locking protrusions on both sides of the first mounting post are internally engaged with the other end of the shock-absorbing spring. The second mounting post has second locking protrusions on both sides, and the second locking protrusions on both sides of the second mounting post are internally engaged with one end of the shock-absorbing spring.