Volume key device combination mechanism

CN122599298BActive Publication Date: 2026-10-30SHENZHEN STRONG TECH
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Patent Information

Application Number
CN202611030986.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-07-13
Publication Date
2026-10-30
Estimated Expiration
2046-07-13

AI Technical Summary

Technical Problem

针对现有技术的不足,本发明的目的在于提供一种音量按键设备组合机构,该组合机构旨在解决现有技术下人工组装效率低、不良率高的技术问题

Benefits of technology

本发明通过输送组件、翻转组件、夹具组件和开合组件的设计,具备结构紧凑,定位精度高的特点,且能适应自动化设备,可夹具布置多穴位,多工位,生产效率高,UPH>500,而且可以对按键外观起到保护作用,良品率高。

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Abstract

The application discloses a kind of volume button equipment combination mechanism, this combination mechanism aims at solving the technical problem of low efficiency, high defective rate of artificial assembly under prior art.It includes big board, the top surface of the big board is provided with sliding block connecting plate, the bottom surface of the sliding block connecting plate is provided with conveying assembly;The top surface of the sliding block connecting plate is fixedly connected with support plate, the support plate is U-shaped structure, the inner side of the support plate is provided with clamp assembly, the side wall of the support plate is provided with turnover assembly;The side wall of the big board is fixedly connected with cylinder fixing seat, the side wall of the cylinder fixing seat is provided with opening and closing assembly, the present application has the characteristics of compact structure, high positioning accuracy, and can adapt to automatic equipment, can be arranged multiple acupoints by clamp, multiple stations, high production efficiency, UPH>500, and can play a protective role on the appearance of button, high yield.
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Description

Technical Field

[0001] This invention belongs to the field of automated production technology, and specifically relates to a volume button device assembly mechanism. Background Technology

[0002] The assembly of volume buttons for 3C products is done manually, which involves many steps and low efficiency. In addition, the volume buttons are relatively small (10mm*2.6mm) and have high requirements for appearance (the surface of the incoming material is facing down to protect the appearance of the volume buttons). The waterproof adhesive gaskets used for assembly require high precision, and the yield rate of manual assembly cannot meet the requirements.

[0003] The existing assembly method is generally to manually use tweezers to flip the two buttons 180 degrees from the tray and put them into the limiting groove of the button fixture (the two buttons are assembled into a set); then, manually use tweezers to take a waterproof adhesive gasket, tear off the two release papers, put it into the waterproof adhesive gasket fixture, open the fixture to vacuum and suck up the waterproof adhesive gasket, and snap the waterproof adhesive gasket onto the button fixture to complete the installation of the two volume buttons.

[0004] However, the accuracy of the volume buttons and waterproof gaskets after assembly is within 0.15mm (the fixture limit groove and the button are in clearance fit, and the assembly accuracy cannot be guaranteed). The defect rate of manual assembly reaches 30%, and the production efficiency is low. To meet the corresponding production needs, 8 people are required.

[0005] Therefore, a volume button device combination mechanism is designed to overcome the above-mentioned technical defects. Summary of the Invention

[0006] (1) Technical problems to be solved In view of the shortcomings of the prior art, the purpose of this invention is to provide a volume button device assembly mechanism, which aims to solve the technical problems of low efficiency and high defect rate of manual assembly under the prior art.

[0007] (2) Technical solution To solve the above-mentioned technical problems, the present invention provides a volume button device assembly mechanism, including a large plate, a slider connecting plate provided on the top surface of the large plate, and a conveying component provided on the bottom surface of the slider connecting plate; A support plate is fixedly connected to the top surface of the slider connecting plate. The support plate has a U-shaped structure. A clamping assembly is provided on the inner side of the support plate, and a flipping assembly is provided on the side wall of the support plate. A cylinder mounting base is fixedly connected to the side wall of the large plate, and an opening and closing assembly is provided on the side wall of the cylinder mounting base.

[0008] Furthermore, the conveying assembly includes a KK module installed and connected to the top surface of the large plate, the slider connecting plate being slidably connected to the KK module, a servo motor being fixedly installed on the top surface of the large plate, a transmission box being fixedly connected to one side wall of the large plate, the output shaft of the servo motor being drivenly connected to the transmission box, and the KK module being drivenly connected to the transmission box.

[0009] Furthermore, a quick-release tray is fitted inside the support plate, and the clamp assembly is located on the quick-release tray.

[0010] Furthermore, the flipping assembly includes a bearing seat rotatably connected to the inner side wall of the support plate near the top surface, a drive motor is fixedly installed on the bottom inner side of the support plate, a reducer is drivenly connected to the output shaft of the drive motor, a synchronous pulley is fixedly connected to one end of one of the bearing seats and the output shaft of the reducer respectively, and a synchronous belt is drivenly connected between the synchronous pulleys on both sides.

[0011] Furthermore, the fixture assembly includes a base, which is assembled between two bearing seats. The top surface of the base has multiple sets of limiting grooves. A cover plate is fixedly connected to the side wall of the base, and a workpiece groove is provided in the limiting groove. A through groove corresponding to the workpiece groove is provided on the cover plate, and a button body is provided in the workpiece groove.

[0012] Furthermore, each set of limiting grooves is slidably connected with two first push blocks, a second push block, a third push block, and a fourth push block. The two first push blocks move along the X-axis to open, and the second and fourth push blocks move along the Y-axis to open. The third push block moves along the Y-axis to push the first push blocks. A first spring is assembled between the first, second, and fourth push blocks and the limiting grooves. An opening and closing control component is provided in the base.

[0013] Furthermore, the opening and closing control assembly includes a first push plate, a second push plate, and a third push plate slidably connected to the side wall of the base. The side wall of the first push plate is provided with a plurality of first inclined grooves. The bottom surface of the second push block is equipped with a first roller. The first roller is in contact with the inclined surface of the first inclined groove. The side wall of the second push plate is provided with a plurality of second inclined grooves. The side wall of the second inclined groove is provided with a third inclined groove.

[0014] Furthermore, the bottom surfaces of the third push block and the fourth push block are respectively equipped with a second roller and a third roller, and the second roller and the third roller are respectively in contact with the inclined surfaces of the second inclined groove and the third inclined groove.

[0015] Furthermore, the opening and closing assembly includes a first cylinder, a second cylinder, and a third cylinder installed on the side wall of the cylinder mounting base. The telescopic ends of the first cylinder, the second cylinder, and the third cylinder are respectively fixedly connected to top plates, and one end of the top plate is opposite to one end of the first push plate, the second push plate, and the third push plate, respectively.

[0016] Furthermore, a support plate is slidably connected to the side wall of the base away from the cover plate. The side wall of the support plate has a groove with a V-shaped structure. A fourth roller is fitted to the side wall of the third push plate. The fourth roller is in contact with the inclined surface of the groove. The support plate moves along the Y-axis. A second spring is connected between the support plate and the base.

[0017] (3) Beneficial effects Compared with the prior art, the beneficial effects of the present invention are as follows: This invention features a compact structure and high positioning accuracy through the design of conveying components, flipping components, clamping components, and opening and closing components. It can adapt to automated equipment, can be clamped in multiple positions and at multiple stations, has high production efficiency (UPH>500), and can also protect the appearance of the buttons, resulting in a high yield rate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the conveying component of the present invention; Figure 3 This is a schematic diagram of the opening and closing component of the present invention; Figure 4 This is a schematic diagram of the structure of the flipping component of the present invention; Figure 5 This is a schematic diagram of the structure of the clamp assembly of the present invention; Figure 6 This is a schematic diagram of the clamping assembly of the present invention from another perspective; Figure 7 This is a partial disassembled structural diagram of the clamp assembly of the present invention; Figure 8 For the present invention Figure 7 A partial upward-view structural diagram; Figure 9 This is a schematic diagram of the structure of the first push plate and the second push plate of the present invention; Figure 10 This is a schematic diagram of the initial state (closed state) of the clamp assembly of the present invention; Figure 11 This is a schematic diagram of the clamp assembly of the present invention in the loading state (open state); Figure 12 This is a schematic diagram showing the material being placed into the clamping assembly of the present invention; Figure 13 This is a schematic diagram of the clamping assembly of the present invention in the state of being clamped and closed when material is placed in it; Figure 14 This is a schematic diagram of the tray in the retracted state of the present invention; Figure 15 This is a schematic diagram of the fixture assembly for mounting materials according to the present invention; Figure 16 This is a schematic diagram of the clamping assembly of the present invention in the unloading state (open state).

[0019] The labels in the attached diagram are as follows: 1. Large plate; 2. Slider connecting plate; 3. Servo motor; 4. Transmission box; 5. KK module; 6. Support plate; 7. Bearing seat; 8. Quick-release tray; 9. Drive motor; 10. Reducer; 11. Synchronous pulley; 12. Synchronous belt; 13. Cylinder mounting base; 14. First cylinder; 15. Second cylinder; 16. Third cylinder; 17. Base; 18. Cover plate; 19. Workpiece groove; 20. Button body; 21. First push block; 22. Second push block; 23. Third push block; 24. Fourth push block; 25. First spring; 26. First roller; 27. Second roller; 28. Third roller; 29. ​​First push plate; 30. Second push plate; 31. Third push plate; 32. First inclined groove; 33. Second inclined groove; 34. Third inclined groove; 35. Support plate; 36. Groove; 37. Fourth roller; 38. Second spring. Detailed Implementation

[0020] This specific embodiment is a volume button device combination mechanism, the structural diagram of which is shown below. Figures 1-16 As shown, the volume button device assembly mechanism includes a large plate 1, a slider connecting plate 2 is provided on the top surface of the large plate 1, and a conveying component is provided on the bottom surface of the slider connecting plate 2. A support plate 6 is fixedly connected to the top surface of the slider connecting plate 2. The support plate 6 has a U-shaped structure. A clamping assembly is provided on the inner side of the support plate 6, and a flipping assembly is provided on the side wall of the support plate 6. A cylinder mounting base 13 is fixedly connected to the side wall of the large plate 1, and an opening and closing assembly is provided on the side wall of the cylinder mounting base 13.

[0021] like Figure 2 As shown, the conveying assembly includes a KK module 5 installed on the top surface of the large plate 1. The slider connecting plate 2 is slidably connected to the KK module 5. The KK module 5 moves smoothly in a linear sliding motion and can bear the long-term high-frequency reciprocating motion of multi-station fixtures. Its wear resistance and service life are much longer than ordinary guide rails, reducing the frequency of equipment downtime for maintenance. A servo motor 3 is fixedly installed on the top surface of the large plate 1. A transmission box 4 is fixedly connected to one side wall of the large plate 1. The output shaft of the servo motor 3 is connected to the transmission box 4. The KK module 5 is connected to the transmission box 4.

[0022] By setting servo parameters through the program, the module's moving speed and stroke can be flexibly adjusted to adapt to the production of volume buttons of different specifications and sizes, making the equipment more versatile; this part belongs to existing mature technology, and the control of KK module 5 can be achieved through existing technical means.

[0023] Specifically, when the servo motor 3 is powered on, the output shaft inputs power into the transmission box 4. After the transmission box 4 completes the speed change and direction change, it drives the KK module 5 to slide linearly back and forth, causing the slider connecting plate 2 to move precisely in the X direction along the top surface of the large plate 1. The upper end of the slider connecting plate 2 is fixed with the support plate 6, so that the support plate 6 and its mounted flipping components and clamping components can be accurately transferred between the loading and unloading stations and the mounting station along with the KK module 5.

[0024] like Figure 4 As shown, the flipping assembly includes a bearing seat 7 rotatably connected to the inner wall of the support plate 6 near the top surface. The bearing seat 7 has a split support design, and the two ends of the base 17 rotate based on the bearing seat 7. The rotation gap is small, the flipping positioning repeatability is high, and the button mounting benchmark is uniform after flipping. A drive motor 9 is fixedly installed on the inner bottom surface of the support plate 6. The output shaft of the drive motor 9 is driven by a reducer 10. One end of one bearing seat 7 and the output shaft of the reducer 10 are fixedly connected to a synchronous pulley 11. A synchronous belt 12 is driven between the two synchronous pulleys 11.

[0025] Among them, the drive motor 9 is equipped with a reducer 10 structure to reduce the output speed and amplify the torque. The start and stop of the flipping is without instantaneous impact, and the appearance of the button body 20 inside the fixture is not damaged by inertial movement, which meets the high appearance quality control requirements of the button.

[0026] Specifically, when a flipping operation is required, the drive motor 9 outputs power, which is reduced and increased in torque by the reducer 10, and drives the synchronous pulley 11 on one side to rotate. The synchronous pulleys 11 on both sides are synchronously transmitted through the synchronous belt 12. The bearing seat 7 acts as a rotating support seat, driving the base 17 to complete a 180° flip around the bearing axis.

[0027] like Figure 4 As shown, a quick-release tray 8 is mounted on the inner side of the support plate 6, and the clamping assembly is located on the quick-release tray 8. The quick-release tray 8 can be quickly disassembled, making it convenient to remove the clamping assembly as a whole for inspection, maintenance, and replacement without disassembling the entire machine, thus significantly shortening the product changeover and debugging time.

[0028] The quick-release tray has 8 pairs of clamping components for limiting and supporting. If the buttons are placed crookedly, the clamps can open to discard defective products. The button mounting surface is facing down when the material arrives. After a 180° flip, the button mounting surface is switched to facing up, making it easier for the robotic arm to pick up the waterproof adhesive gasket and apply it accurately.

[0029] like Figures 4-8As shown, the fixture assembly includes a base 17, which is mounted between two bearing seats 7 on both sides. Multiple sets of limiting grooves are formed on the top surface of the base 17. A cover plate 18 is fixedly connected to the side wall of the base 17, and a workpiece groove 19 is formed within each limiting groove. A through groove corresponding to the workpiece groove 19 is formed on the cover plate 18. The robotic arm can pick up and place materials through the through groove. The cover plate 18 simultaneously limits the upper end of the button to prevent it from shifting upwards, providing all-around protection for the button's appearance. A button body 20 is set inside the workpiece groove 19, and two first push blocks are slidably connected within each set of limiting grooves. 21. The second push block 22, the third push block 23, and the fourth push block 24. The two first push blocks 21 move along the X-axis to open, and the second push block 22 and the fourth push block 24 move along the Y-axis to open. The third push block 23 moves along the Y-axis to push the first push block 21. The first push block 21, the second push block 22, and the fourth push block 24 are equipped with a first spring 25 between them and the limiting groove. The first spring 25 has a built-in reset and achieves automatic clamping by relying on elasticity. No additional power source is required, which simplifies the air circuit layout and reduces the energy consumption and failure rate of the equipment. An opening and closing control component is provided in the base 17.

[0030] like Figures 7-9 As shown, the opening and closing control assembly includes a first push plate 29, a second push plate 30, and a third push plate 31 slidably connected to the side wall of the base 17. The side wall of the first push plate 29 has a plurality of first inclined grooves 32. The bottom surface of the second push block 22 is equipped with a first roller 26, which is in contact with the inclined surface of the first inclined groove 32. The side wall of the second push plate 30 has a plurality of second inclined grooves 33, and the side wall of the second inclined groove 33 has a third inclined groove 34. The bottom surfaces of the third push block 23 and the fourth push block 24 are respectively equipped with a second roller 27 and a third roller 28, which are in contact with the inclined surfaces of the second inclined groove 33 and the third inclined groove 34, respectively.

[0031] The cam transmission structure with inclined groove and roller converts the linear displacement of the push plate into the multi-directional opening displacement of the push block. A single push plate can simultaneously control multiple sets of push blocks, simplifying the number of cylinders and reducing the layout of air source pipelines.

[0032] like Figure 3 As shown, the opening and closing assembly includes a first cylinder 14, a second cylinder 15, and a third cylinder 16 installed on the side wall of the cylinder mounting base 13. The telescopic ends of the first cylinder 14, the second cylinder 15, and the third cylinder 16 are respectively fixedly connected to top plates, and one end of the top plate is opposite to one end of the first push plate 29, the second push plate 30, and the third push plate 31, respectively.

[0033] Specifically, the first cylinder 14 drives the first push plate 29 to move, and the inclined surface of the first sloping groove 32 presses the first roller 26, causing the second push block 22 to expand outward along the Y-axis; An external air source controls the independent extension and retraction of three cylinders. The first cylinder 14 extends to push the first push plate 29, controlling the opening and closing of the push blocks for acupoints #1, #3, #5, and #7. The second cylinder 15 extends to push the second push plate 30, controlling the opening and closing of the push blocks for acupoints #2, #4, #6, and #8. The third cylinder 16 extends to push the third push plate 31, controlling the extension and retraction of the support plate 35. When unloading is complete, the first cylinder 14 and the second cylinder 15 extend synchronously, opening all acupoints, allowing the robotic arm to directly remove all four assembled button sets at once. The three cylinders are controlled independently in zones, enabling separate loading or simultaneous opening and closing of odd-numbered and even-numbered acupoints, flexibly matching the robotic arm's batch / full-batch loading process, resulting in greater freedom in production layout.

[0034] The second push plate 30 moves forward, the second inclined groove 33 and the third inclined groove 34 respectively squeeze the second roller 27 and the third roller 28, driving the third push block 23 and the fourth push block 24 to open along the Y axis. The third push block 23 simultaneously pushes the first push block 21 to separate along the X axis, and all push blocks overcome the elastic force of the first spring 25 to open the workpiece groove 19. At the same time, the third push plate 31 moves forward, and the fourth roller 37 slides along the inclined surface of the V-shaped groove 36, pushing the support plate 35 to extend below the workpiece groove 19, and lifting the button body 20 from the bottom to prevent the button from falling off when the robot arm releases the material.

[0035] Each cylinder retracts to cancel the top thrust, the first spring 25 rebounds and pulls each push block to reset, the first push block 21, the second push block 22, and the fourth push block 24 clamp the button body 20 from both X and Y directions, multi-directional limiting eliminates the button assembly gap, and the two buttons are paired and positioned based on the base 17 reference; after the third push plate 31 retracts, the second spring 38 pulls the support plate 35 to retract and make way, leaving operating space for subsequent flipping and mounting.

[0036] Among them, the X+Y axis multi-directional block pushing structure is different from the single-sided clamping fixture, and the limit buttons are set from four directions to eliminate the assembly deviation caused by the traditional clearance fit. In addition, the multi-cavity partitioned layout (8 slots and 4 pairs) allows for the simultaneous positioning of 4 pairs of buttons during a single feeding, and the robotic arm can simultaneously pick up and place 4 buttons, greatly improving the efficiency of a single feeding. The first spring 25 is built-in for reset, and it achieves automatic clamping by relying on elasticity. It does not require an additional power source, simplifies the air circuit layout, and reduces equipment energy consumption and failure rate.

[0037] like Figure 5 As shown, a support plate 35 is slidably connected to the side wall of the base 17 away from the cover plate 18. The side wall of the support plate 35 has a groove 36 with a V-shaped structure. A fourth roller 37 is assembled on the side wall of the third push plate 31. The fourth roller 37 is in contact with the inclined surface of the groove 36. The support plate 35 moves along the Y-axis. A second spring 38 is connected between the support plate 35 and the base 17.

[0038] Specifically, the third cylinder 16 extends and drives the third push plate 31 to move forward. At this time, the fourth roller 37 climbs up the slope along the V-shaped groove 36, and the pallet 35 is pushed out to support the material. The third cylinder 16 retracts, and the second spring 38 pulls the tray 35 back to its original position, avoiding the space of the flipping and mounting station.

[0039] The V-shaped inclined plane linkage structure allows a single cylinder to complete the 35° extension and retraction control of the pallet, eliminating the need for an independent drive cylinder, optimizing the overall structure and reducing equipment manufacturing costs. All technical features in this embodiment can be freely combined according to actual needs.

[0040] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present technical solution are within the protection scope of the present invention.

Claims

1. A volume button device assembly mechanism, comprising a large plate (1), characterized in that: The top surface of the large plate (1) is provided with a slider connecting plate (2), and the bottom surface of the slider connecting plate (2) is provided with a conveying component; The top surface of the slider connecting plate (2) is fixedly connected to a support plate (6). The support plate (6) has a U-shaped structure. A clamp assembly is provided on the inner side of the support plate (6). A flipping assembly is provided on the side wall of the support plate (6). The flipping assembly includes a bearing seat (7) that is rotatably connected to the inner side wall of the support plate (6) near the top surface. A cylinder mounting base (13) is fixedly connected to the side wall of the large plate (1), and an opening and closing assembly is provided on the side wall of the cylinder mounting base (13). The fixture assembly includes a base (17), which is assembled between two bearing seats (7). The top surface of the base (17) has multiple sets of limiting grooves. A cover plate (18) is fixedly connected to the side wall of the base (17), and a workpiece groove (19) is provided in the limiting groove. A through groove corresponding to the workpiece groove (19) is provided on the cover plate (18), and a button body (20) is provided in the workpiece groove (19). Each set of limiting grooves is slidably connected to a second push block (22), a third push block (23), a fourth push block (24), and two first push blocks (21). The two first push blocks (21) move in different directions along the X-axis. The second push block (22) and the fourth push block (24) both move in the same direction along the Y-axis to open. The third push block (23) moves along the Y-axis to push the first push block (21). The first push block (21), the second push block (22), and the fourth push block (24) are each equipped with a first spring (25) between themselves and the limiting groove. The base (17) is provided with an opening and closing control assembly. The opening and closing control assembly includes a first push plate (29), a second push plate (30), and a third push plate (31) slidably connected to the side wall of the base (17). The opening and closing assembly includes a first cylinder (14), a second cylinder (15), and a third cylinder (16) installed on the side wall of the cylinder mounting base (13). The telescopic ends of the first cylinder (14), the second cylinder (15), and the third cylinder (16) are respectively fixedly connected to a top plate, and one end of the top plate is opposite to one end of the first push plate (29), the second push plate (30), and the third push plate (31). A single push plate can synchronously control multiple sets of push blocks to work together.

2. The volume button device assembly mechanism according to claim 1, characterized in that: The conveying assembly includes a KK module (5) installed on the top surface of the large plate (1), the slider connecting plate (2) is slidably connected to the KK module (5), a servo motor (3) is fixedly installed on the top surface of the large plate (1), a transmission box (4) is fixedly connected to one side wall of the large plate (1), the output shaft of the servo motor (3) is connected to the transmission box (4) in a transmission connection, and the KK module (5) is connected to the transmission box (4) in a transmission connection.

3. The volume button device assembly mechanism according to claim 1, characterized in that: The support plate (6) is fitted with a quick-release tray (8) on its inner side, and the clamp assembly is located on the quick-release tray (8).

4. The volume button device assembly mechanism according to claim 1, characterized in that: A drive motor (9) is fixedly installed on the inner bottom surface of the support plate (6). The output shaft of the drive motor (9) is connected to a reducer (10). One end of one of the bearing seats (7) and the output shaft of the reducer (10) are respectively fixedly connected to a synchronous pulley (11). A synchronous belt (12) is connected between the two synchronous pulleys (11).

5. The volume button device assembly mechanism according to claim 1, characterized in that: The first push plate (29) has multiple first inclined grooves (32) on its side wall, and the second push block (22) is equipped with a first roller (26) on its bottom surface. The first roller (26) is in contact with the inclined surface of the first inclined groove (32). The second push plate (30) has multiple third inclined grooves (34) on its side wall, and the third inclined groove (34) has a second inclined groove (33) on its side wall.

6. The volume button device assembly mechanism according to claim 5, characterized in that: The bottom surfaces of the third push block (23) and the fourth push block (24) are respectively equipped with the second roller (27) and the third roller (28), and the second roller (27) and the third roller (28) are respectively in contact with the inclined surfaces of the second inclined groove (33) and the third inclined groove (34).

7. The volume button device assembly mechanism according to claim 6, characterized in that: A support plate (35) is slidably connected to the side wall of the base (17) away from the cover plate (18). The side wall of the support plate (35) has a groove (36) with a V-shaped structure. The side wall of the third push plate (31) is equipped with a fourth roller (37). The fourth roller (37) is in contact with the inclined surface of the groove (36). The support plate (35) moves along the Y-axis. A second spring (38) is connected between the support plate (35) and the base (17).

Citation Information

Patent Citations

  • Reverse standard positioning device used for machining mobile phone volume key supports

    CN204123134U

  • Multi -functional volume key making attachment

    CN208246336U