Wheel silencing ring and joint treatment method thereof

Abstract

The invention relates to the technical field of wheel noise reduction rings, in particular to a wheel noise reduction ring and a joint processing method.The wheel noise reduction ring comprises a steel sleeve and connecting plates installed on the two sides of the steel sleeve, the ends, away from the steel sleeve, of the connecting plates are connected with upper protruding blocks, and upper semicircular grooves are formed in the upper protruding blocks; an upper semicircular plate is rotationally connected to the interior of the upper semicircular groove through a return rotating shaft, the upper semicircular plate is inclined, and a lower convex block is movably connected to the end, away from the steel sleeve, of the upper convex block; by arranging the connector and the steel core structure which can be connected in an inserted mode, the upper semicircular plate and the lower semicircular plate which are clamped and limited and the self-reset mechanism are matched, rapid installation and stable locking of the silencing ring connector are completed under the condition that tools and bonding are not needed, the operation efficiency and the structural reliability are improved, meanwhile, through a separation mechanism for linkage of the shifting plate and the lower semicircular plate, the silencing ring connector can be rapidly installed and stably locked, and the silencing ring connector can be rapidly installed and stably locked. Therefore, the disassembly process is simpler and more convenient, the traditional destructive operation mode is avoided, and the applicability of the product in the vehicle maintenance and part replacement process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wheel silencer rings, and in particular to a wheel silencer ring and a joint processing method thereof. Background Art

[0002] A wheel silencer ring is an annular component installed inside a vehicle's wheel hub or rim. Its main function is to reduce the resonance noise and rolling noise generated by the wheel during driving. The component has a compact structure and is usually fitted to the inner wall of the rim or embedded in the tire cavity, without affecting the wheel's motion performance and structural balance. The silencer ring is often made of high-density foam, rubber composites, or metal composites with porous sound-absorbing properties. It has excellent sound wave attenuation capabilities and environmental adaptability. During operation, it reflects, absorbs, and attenuates sound waves propagating in the cavity multiple times, significantly weakening the resonance accumulation of sound energy in the cavity and reducing the secondary amplification effect of noise. However, the existing silencer rings generally have the problem of low joint installation efficiency in their structural design. Most of them use adhesive or embedded press connections, which are difficult to achieve quick positioning and firm fixation. Disassembly also requires the use of tools, which can easily cause damage to the silencer ring body or the wheel structure. This problem is not conducive to improving the efficiency of maintenance, replacement, and batch assembly in actual use. Summary of the Invention

[0003] In order to overcome the problem of low joint installation efficiency that is common in the structural design of existing silencer rings, adhesive or embedded press connections are mostly used, which make it difficult to achieve quick positioning and firm fixation. Disassembly also requires the use of tools, which can easily cause damage to the silencer ring body or the wheel structure.

[0004] The technical solution of the present invention is as follows: a wheel silencer ring comprises a steel sleeve and connecting plates for mounting on both sides of the steel sleeve, an upper convex block is connected to the end of the connecting plate away from the steel sleeve, an upper semicircular groove is provided inside the upper convex block, an upper semicircular plate is rotatably connected to the upper semicircular plate through a back-force rotating shaft inside the upper semicircular groove, the upper semicircular plate is inclined, an end of the upper convex block away from the steel sleeve is movably connected to the lower convex block, a lower semicircular groove is provided inside the lower convex block, the lower semicircular plate is rotatably connected to the lower semicircular plate through a back-force rotating shaft, and a groove is provided at the bottom of the lower convex block The lower semicircular plate extends into the groove and is connected to a shift plate. The outer end of the upper protrusion is wrapped with a rubber sleeve, and the rubber sleeve is movably connected to the lower protrusion. The end of the lower protrusion away from the upper protrusion is connected to a connecting block, and the end of the connecting block away from the lower protrusion is connected to a connecting head. The upper protrusion and the lower protrusion match so that the upper semicircular plate and the lower semicircular plate fit together until they are horizontal. When the upper semicircular plate and the lower semicircular plate are completely fitted together, the rebound shaft drives the upper and lower semicircular plates to reset, so that the upper and lower semicircular plates enter the lower semicircular groove and the upper semicircular groove for limiting.

[0005] Preferably, a steel core is provided at one end of the connector away from the connecting block, and a socket is provided at one end of the steel core close to the connector, and the socket is movably connected to the connector.

[0006] Preferably, a steel ring is connected between the two steel cores, the outer end of the steel ring is wrapped with a filler, and the outer end of the filler is wrapped with a noise reduction sleeve.

[0007] Preferably, the outer end of the noise reduction sleeve is connected to a silencer hole ring, a plurality of holes are opened on the outer surface of the silencer hole ring, and the outer end of the silencer hole ring is wrapped with a protective sleeve, which is connected to the steel core.

[0008] Preferably, a filling groove is provided inside the steel sleeve, and a glue injection hole is provided on the top of the steel sleeve, and the glue injection hole is used for injecting glue into the steel sleeve.

[0009] Preferably, the glue injection hole is movably connected to a rubber valve, and the steel sleeve is internally connected to a positioning ring.

[0010] Preferably, one end of the positioning ring close to the connecting plate is connected to a positioning block, and one end of the positioning block close to the connecting plate is connected to a spring, and the spring is connected to the connecting plate.

[0011] Preferably, one end of the connecting plate close to the spring is connected to a limiting cylinder, the limiting cylinder is slidably connected to the steel sleeve, and the limiting cylinder is movably connected to the positioning ring.

[0012] Preferably, when the connecting plate is squeezed, the spring is driven to contract, and at the same time, the limiting cylinder is driven to slide inside the steel sleeve.

[0013] A method for processing a joint of a wheel silencer ring, used for the above-mentioned wheel silencer ring, comprises the following steps: S1: Insert the connector on the connecting block into the socket on the steel core, and then insert the lower protrusion into the rubber sleeve so that the lower protrusion matches the upper protrusion. At the same time, squeeze the upper semicircular plate and the lower semicircular plate against each other to keep them level. When the upper semicircular plate and the lower semicircular plate are completely fitted together, the return shaft drives the upper semicircular plate and the lower semicircular plate to reset, so that the upper semicircular plate and the lower semicircular plate enter the upper semicircular groove and the lower semicircular groove respectively for limiting.

[0014] S2: Pull out the rubber valve, open the glue injection hole, and inject glue into the filling tank. Then insert the rubber valve into the glue injection hole.

[0015] S3: When the steel ring is squeezed, it drives the steel core to move. The movement of the steel core drives the connector to move the connecting block. The movement of the connecting block drives the lower protrusion to push the upper protrusion. The upper protrusion drives the connecting plate to squeeze the spring to achieve buffering.

[0016] S4: The steel ring serves as the rigid skeleton of the ring body to maintain the overall stability of the structure. The filler covering the outside of the steel ring is made of high-density polyurethane foam, foam rubber or open-pore sound-absorbing material. The noise reduction cover is made of butyl rubber or EVA composite film. The outer surface of the silencer ring is provided with a number of holes, which can break up the sound wave path, suppress standing wave resonance, and enhance the multi-level attenuation capability of sound waves. The protective cover is made of wear-resistant silicone or thermoplastic elastomer.

[0017] S5: When disassembly is required, use an external tool to separate the rubber sleeve, then depress the paddle to drive the lower semicircular plate to rotate, and the rotation of the lower semicircular plate drives the upper semicircular plate to rotate, so that the upper and lower semicircular plates remain horizontal at the same time, and then pull out the lower protrusion to complete the disassembly.

[0018] Beneficial effects of the present invention: 1. By setting up the movable matching structure of the connecting block, the connecting head and the steel core jack, combined with the matching clamping mechanism between the upper and lower protrusions, and the self-resetting limit device of the upper and lower semicircular plates in conjunction with the return shaft, the rapid plug-in and automatic positioning of the joint part are achieved, which significantly improves the installation efficiency. This structure does not require the use of traditional fixing methods such as screws and adhesives, and can complete a stable connection in a short time, avoiding the problems of loose adhesion and time-consuming installation, ensuring that the silencer ring still has good structural stability under high-speed operation.

[0019] 2. The present invention is designed with a rotating separation mechanism that links the pry plate and the lower semicircular plate. Combined with the protection of the rubber sleeve, after cutting the rubber sleeve, the upper and lower semicircular plates can be separated by simply depressing the pry plate without damaging the main body structure, thereby achieving rapid disassembly of the lower protrusion. Compared with the traditional method of relying on forced prying or destructive disassembly with tools, the device provides a safer, more efficient and controllable disassembly and assembly solution, which is suitable for vehicle maintenance and parts replacement scenarios, and improves the convenience of use and maintainability of the silencer ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Shown is a schematic diagram of a three-dimensional explosion structure of a wheel silencer ring steel sleeve of the present invention; Figure 2 Shown is a schematic diagram of a three-dimensional exploded cross-sectional structure of a wheel silencer ring steel sleeve of the present invention; Figure 3 Shown is a schematic diagram of a three-dimensional cross-sectional structure of a wheel silencer ring steel sleeve of the present invention; Figure 4 Shown is a schematic diagram of the three-dimensional structure of a wheel silencer ring of the present invention; Figure 5 Shown is a schematic diagram of the three-dimensional structure of a wheel silencer ring protective cover of the present invention; Figure 6Shown is a schematic diagram of a three-dimensional upper cross-section structure of a wheel silencer ring protective cover of the present invention; Figure 7 The wheel silencer ring of the present invention is shown Figure 6 Enlarged structural diagram at point A in the middle.

[0021] Explanation of the accompanying reference numerals: 1. Steel sleeve; 21. Connecting plate; 22. Upper protrusion; 23. Upper semicircular groove; 24. Upper semicircular plate; 25. Lower protrusion; 26. Lower semicircular groove; 27. Lower semicircular plate; 28. Paddle plate; 29. ​​Rubber sleeve; 210. Connecting block; 211. Connecting head; 31. Steel core; 32. Socket; 33. Steel ring; 34. Filler; 35. Noise reduction sleeve; 36. Silencing hole ring; 37. Protective sleeve; 41. Filling groove; 42. Glue injection hole; 43. Rubber valve; 44. Positioning ring; 45. Positioning block; 46. Spring; 47. Limiting cylinder. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and examples.

[0023] See also Figure 1-Figure 7The present invention provides an embodiment: a wheel silencer ring, comprising a steel sleeve 1 and connecting plates 21 installed on both sides of the steel sleeve 1, the connecting plate 21 is connected to an upper protrusion 22 at one end away from the steel sleeve 1, an upper semicircular groove 23 is provided inside the upper protrusion 22, an upper semicircular plate 24 is rotatably connected to the upper semicircular groove 23 through a back-force rotating shaft, the upper semicircular plate 24 is inclined, the upper protrusion 22 is movably connected to the end away from the steel sleeve 1 by a lower protrusion 25, a lower semicircular groove 26 is provided inside the lower protrusion 25, and a lower semicircular plate 27 is rotatably connected to the lower semicircular groove 26 through a back-force rotating shaft, the bottom of the lower protrusion 25 A groove is opened, and the lower semicircular plate 27 extends to the inside of the groove and is connected to a dial plate 28. The outer end of the upper protrusion 22 is wrapped with a rubber sleeve 29, and the rubber sleeve 29 is movably connected to the lower protrusion 25. The end of the lower protrusion 25 away from the upper protrusion 22 is connected to a connecting block 210, and the end of the connecting block 210 away from the lower protrusion 25 is connected to a connecting head 211. The upper protrusion 22 and the lower protrusion 25 are matched to make the upper semicircular plate 24 and the lower semicircular plate 27 fit together until they are horizontal. When the upper semicircular plate 24 and the lower semicircular plate 27 are completely fitted together, the pull-back shaft drives the upper semicircular plate 24 and the lower semicircular plate 27 to reset, so that the upper semicircular plate 24 and the lower semicircular plate 27 are The lower semicircular plate 27 enters the lower semicircular groove 26 and the upper semicircular groove 23 for limiting. By setting a linkage mechanism between the upper semicircular plate 24 and the lower semicircular plate 27, during the installation process, the connector 211 on the connecting block 210 is inserted into the jack 32 on the steel core 31, and the lower protrusion 25 is inserted into the rubber sleeve 29, so that the lower protrusion 25 and the upper protrusion 22 are accurately aligned and squeezed against each other, thereby driving the upper semicircular plate 24 and the lower semicircular plate 27 to fit together to a horizontal state. When the two pieces are completely fitted together, the return shaft automatically drives them to reset, so that they are respectively embedded in the upper semicircular groove 23 and the lower semicircular groove 26 to form a limit. The whole process does not require screw fixation or complex tool operation, which significantly improves the installation efficiency and stability of the silencer ring. When disassembly is required, it is only necessary to cut the rubber sleeve 29 first, and then drive the lower semicircular plate 27 to rotate by depressing the dial plate 28, thereby driving the upper semicircular plate 24 to rotate synchronously. After the two are restored to a horizontal state, the lower protrusion 25 can be easily pulled out to complete the quick disassembly. This disassembly method has a reasonable structure and is easy to operate. It effectively avoids damage to the main body structure, significantly improves the flexibility of use and convenience of maintenance, and is especially suitable for multiple replacement or maintenance scenarios, with excellent practicality and engineering adaptability.

[0024] See also Figure 1-Figure 7In this embodiment, a steel core 31 is provided at one end of the connector 211 away from the connector block 210, and a socket 32 ​​is provided at one end of the steel core 31 close to the connector 211. The socket 32 ​​is movably connected to the connector 211, and a steel ring 33 is connected between the two steel cores 31. The outer end of the steel ring 33 is wrapped with a filler 34, and the outer end of the filler 34 is wrapped with a noise reduction sleeve 35. The outer end of the noise reduction sleeve 35 is connected to a silencer hole ring 36. The outer surface of the silencer hole ring 36 is provided with a plurality of holes, and the outer end of the silencer hole ring 36 is wrapped with a protective The sheath 37 is connected to the steel core 31. A filling groove 41 is provided inside the steel sleeve 1. A glue injection hole 42 is provided on the top of the steel sleeve 1. The glue injection hole 42 is used to inject glue inside the steel sleeve 1. The steel ring 33 provides rigid support. The filler 34 and the noise reduction sleeve 35 together constitute a composite multi-layer sound-absorbing structure with excellent sound absorption, sound insulation and vibration resistance. The filler 34 is preferably made of high-density closed-cell polyurethane foam, microporous foam rubber or open-cell sound-absorbing fiber material, which not only has excellent sound wave energy The noise reduction sleeve 35 is made of butyl rubber or EVA (ethylene-vinyl acetate copolymer) composite film material. The former has excellent damping properties and airtightness, while the latter has good flexibility and aging resistance. It can effectively block sound wave penetration and isolate external thermal noise interference while maintaining the integrity of the coating. The overall structural synergy greatly enhances the noise reduction effect and durability of the silencer ring, effectively absorbing the resonant noise generated within the wheel cavity. The silencer hole ring 36 is made of TPE or flexible silicone material. It has an overall annular hollow structure with a number of acoustic openings evenly distributed on the outer surface. It can adapt to the curvature of the inner wall of the wheel rim and has excellent sound wave absorption and diffusion capabilities. The hole structure of the silencer hole ring 36 further breaks up the sound wave path and improves the sound energy attenuation efficiency. The protective sleeve 37 improves the overall wear resistance and structural integrity. The glue injection hole 42 and the filling groove 41 can be used to inject glue into the interior of the steel sleeve 1 at specific points, enhancing the vibration absorption and noise reduction effect.

[0025] See also Figure 1-Figure 3The cam 46 is connected to the spring 46 at one end of the spring 46 and is connected to the spring 46. The spring 46 is connected to the spring 46 and is connected to the spring 46. The spring 46 is connected to the spring 46 and is connected to the spring 46. The spring 46 is connected to the spring 46 and is connected to the spring 46. The spring 46 is connected to the spring 46. The spring 46 is connected to the spring 46. The spring 46 is connected to the spring 46. The spring 46 is connected to the spring 46. The spring 46 is connected to the spring 46. The spring 46 is connected to the spring 46. The spring 46 is connected to the spring 46. The spring 46 is connected to the spring 46. The spring 46 is connected to the spring 46.

[0026] See also Figure 1-Figure 7 In this embodiment, the present invention provides a method for processing a joint of a wheel silencer ring, which is used for the above-mentioned wheel silencer ring and includes the following steps: S1: Insert the connector 211 on the connecting block 210 into the socket 32 ​​on the steel core 31, and then insert the lower protrusion 25 into the rubber sleeve 29 so that the lower protrusion 25 matches the upper protrusion 22. At the same time, squeeze the upper semicircular plate 24 and the lower semicircular plate 27 against each other so that the upper semicircular plate 24 and the lower semicircular plate 27 are kept level. When the upper semicircular plate 24 and the lower semicircular plate 27 are completely fitted together, the return shaft drives the upper semicircular plate 24 and the lower semicircular plate 27 to reset, so that the upper semicircular plate 24 and the lower semicircular plate 27 enter the upper semicircular groove 23 and the lower semicircular groove 26 respectively for position limiting.

[0027] S2 : Pull out the rubber valve 43 , open the glue injection hole 42 and inject glue into the filling tank 41 , then insert the rubber valve 43 into the glue injection hole 42 .

[0028] S3: When the steel ring 33 is squeezed, it drives the steel core 31 to move. The movement of the steel core 31 drives the connector 211 to move the connecting block 210. The movement of the connecting block 210 drives the lower protrusion 25 to push the upper protrusion 22. The upper protrusion 22 drives the connecting plate 21 to squeeze the spring 46 to achieve buffering.

[0029] S4: The steel ring 33 serves as the rigid skeleton of the ring body and has excellent deformation resistance. It can effectively resist centrifugal force and vibration impact during high-speed rotation, maintaining the overall stability of the structure. The outside of the steel ring 33 is covered with a filler 34. This filler layer is made of high-density polyurethane foam, foam rubber, or open-cell sound-absorbing material, and has excellent sound wave absorption and vibration cushioning properties, significantly weakening the propagation of sound wave energy. The noise reduction sleeve 35 covering the filler 34 is made of butyl rubber or EVA composite film, which can effectively isolate sound wave leakage and resist external environmental interference, further enhancing the noise suppression effect. The outside of the noise reduction sleeve 35 is provided with a sound-absorbing hole ring 36. Its outer surface is provided with a number of holes. By breaking up the sound wave path and suppressing standing wave resonance, the multi-stage sound wave attenuation capability is enhanced, thereby improving the overall sound reduction effect. The outermost layer is covered with a protective sleeve 37 made of wear-resistant silicone or thermoplastic elastomer (TPE). It is used to provide effective mechanical protection and waterproof and dustproof capabilities for the entire component, enabling the structure to maintain stable operation under complex working conditions and have good durability and adaptability.

[0030] S5: When disassembly is required, use an external tool to separate the rubber sleeve 29, then detent the paddle 28 to drive the lower semicircular plate 27 to rotate, and the rotation of the lower semicircular plate 27 drives the upper semicircular plate 24 to rotate, so that the upper and lower semicircular plates 24 and 27 remain horizontal at the same time, and then pull out the lower protrusion 25 to complete the disassembly.

Claims

1. A wheel silencer ring, comprising a steel sleeve (1); characterized in that: The connecting plate (21) on both sides of the steel sleeve (1) is also included. The connecting plate (21) is connected to an upper protrusion (22) at one end away from the steel sleeve (1). An upper semicircular groove (23) is provided inside the upper protrusion (22). The upper semicircular groove (23) is connected to an upper semicircular plate (24) by rotating the upper semicircular plate (24) through a back-force shaft. The upper semicircular plate (24) is inclined. The upper protrusion (22) is movably connected to an end away from the steel sleeve (1) of the lower protrusion (25). A lower semicircular groove (26) is provided inside the lower protrusion (25). The lower semicircular groove (26) is connected to a lower semicircular plate (27) by rotating the lower semicircular plate (27) through a back-force shaft. A groove is provided at the bottom of the lower protrusion (25). The lower semicircular plate (27) extends to the groove and is connected to a dial plate (28). The outer end of the upper protrusion (22) is wrapped with a rubber sleeve (29), and the rubber sleeve (29) is movably connected to the lower protrusion (25). The end of the lower protrusion (25) away from the upper protrusion (22) is connected to the connecting block (210), and the end of the connecting block (210) away from the lower protrusion (25) is connected to the connecting head (211). The upper protrusion (22) and the lower protrusion (25) are matched so that the upper semicircular plate (24) and the lower semicircular plate (27) are fitted until they are horizontal. When the upper semicircular plate (24) and the lower semicircular plate (27) are completely fitted, the return shaft drives the upper semicircular plate (24) and the lower semicircular plate (27) to reset, so that the upper semicircular plate (24) and the lower semicircular plate (27) enter the lower semicircular groove (26) and the upper semicircular groove (23) for limiting.

2. The wheel silencer ring according to claim 1, characterized in that: A steel core (31) is provided at one end of the connector (211) away from the connecting block (210), and a socket (32) is provided at one end of the steel core (31) close to the connector (211). The socket (32) is movably connected to the connector (211).

3. The wheel silencer ring according to claim 2, characterized in that: A steel ring (33) is connected between the two steel cores (31), the outer end of the steel ring (33) is wrapped with a filler (34), and the outer end of the filler (34) is wrapped with a noise reduction sleeve (35).

4. The wheel silencer ring according to claim 3, characterized in that: The outer end of the noise reduction sleeve (35) is connected to a silencer hole ring (36), and a plurality of holes are opened on the outer surface of the silencer hole ring (36). The outer end of the silencer hole ring (36) is wrapped with a protective sleeve (37), and the protective sleeve (37) is connected to the steel core (31).

5. The wheel silencer ring according to claim 4, characterized in that: A filling groove (41) is provided inside the steel sleeve (1), and a glue injection hole (42) is provided on the top of the steel sleeve (1). The glue injection hole (42) is used for injecting glue into the steel sleeve (1).

6. The wheel silencer ring according to claim 5, characterized in that: The inside of the glue injection hole (42) is movably connected to a rubber valve (43), and the inside of the steel sleeve (1) is connected to a positioning ring (44).

7. The wheel silencer ring according to claim 6, characterized in that: One end of the positioning ring (44) close to the connecting plate (21) is connected to a positioning block (45), and one end of the positioning block (45) close to the connecting plate (21) is connected to a spring (46), and the spring (46) is connected to the connecting plate (21).

8. The wheel silencer ring according to claim 7, characterized in that: One end of the connecting plate (21) close to the spring (46) is connected to the limiting cylinder (47), the limiting cylinder (47) is slidably connected to the steel sleeve (1), and the limiting cylinder (47) is movably connected to the positioning ring (44).

9. The wheel silencer ring according to claim 8, characterized in that: When the connecting plate (21) is squeezed, the spring (46) is driven to contract, and at the same time, the limiting cylinder (47) is driven to slide inside the steel sleeve (1).

10. A method for processing a joint of a wheel silencer ring, characterized in that: A wheel silencer ring as claimed in claim 9, comprising the following steps: S1: Insert the connector (211) on the connecting block (210) into the socket (32) on the steel core (31), and then insert the lower protrusion (25) into the rubber sleeve (29), so that the lower protrusion (25) matches the upper protrusion (22), and at the same time squeeze the upper semicircular plate (24) and the lower semicircular plate (27) against each other, so that the upper semicircular plate (24) and the lower semicircular plate (27) are kept horizontal. When the upper semicircular plate (24) and the lower semicircular plate (27) are completely fitted together, the return shaft drives the upper semicircular plate (24) and the lower semicircular plate (27) to reset, so that the upper semicircular plate (24) and the lower semicircular plate (27) enter the upper semicircular groove (23) and the lower semicircular groove (26) respectively for limiting; S2: Pull out the rubber valve (43), open the glue injection hole (42), inject glue into the filling tank (41), and then insert the rubber valve (43) into the glue injection hole (42); S3: When the steel ring (33) is squeezed, it drives the steel core (31) to move. The movement of the steel core (31) drives the connector (211) to move the connecting block (210). The movement of the connecting block (210) drives the lower protrusion (25) to push the upper protrusion (22). The upper protrusion (22) drives the connecting plate (21) to squeeze the spring (46) to achieve buffering. S4: The steel ring (33) serves as the rigid skeleton of the ring body to maintain the overall stability of the structure. The filler (34) covering the outside of the steel ring (33) is made of high-density polyurethane foam, foam rubber or open-pore sound-absorbing material. The noise reduction cover (35) is made of butyl rubber or EVA composite film. The outer surface of the sound-absorbing hole ring (36) is provided with a number of holes to break up the sound wave path and suppress the standing wave resonance, thereby enhancing the multi-level attenuation capability of the sound wave. The protective cover (37) is made of wear-resistant silicone or thermoplastic elastomer. S5: When disassembly is required, the rubber sleeve (29) is separated by an external tool, and then the dial plate (28) is pressed to cause the dial plate (28) to drive the lower semicircular plate (27) to rotate, and the rotation of the lower semicircular plate (27) drives the upper semicircular plate (24) to rotate, so that the upper semicircular plate (24) and the lower semicircular plate (27) are kept in a horizontal state at the same time, and then the lower protrusion (25) is pulled out to complete the disassembly.

Images