An in-ear earphone shell processing device

Abstract

This invention relates to the field of headphone component manufacturing technology, and more particularly to a processing device for in-ear headphone shells. The invention provides a processing device for in-ear headphone shells, including a spray booth, and further comprising: a rotary drive mechanism installed inside the spray booth for driving the workpiece to revolve and switch work positions; a spraying execution mechanism installed in the upper part of the spray booth for reciprocating scanning spraying of the workpiece; and a tilt adjustment mechanism, whose execution component is installed on the workpiece clamping unit carried by the rotary drive mechanism for adjusting the tilt angle of the workpiece. This device, through the coordinated operation of the tilt adjustment mechanism and the nozzle height linkage mechanism, dynamically maintains the optimal distance between the nozzle and the inclined workpiece surface. This effectively eliminates defects such as drips, dry spraying, and uneven coverage caused by improper distance, ensuring uniform adhesion and excellent appearance of the coating on complex curved surfaces, significantly improving product yield and texture.

Description

Technical Field

[0001] This invention relates to the field of headphone parts manufacturing technology, and in particular to a processing apparatus for in-ear headphone shells. Background Technology

[0002] As an important category of modern consumer electronics products, the appearance, texture, color, and surface treatment of headphones directly affect users' purchasing intentions and brand experience. Among these, the shell is one of the key processes for achieving visual differentiation of products, improving tactile quality, and endowing surface with functional properties (such as wear resistance, fingerprint resistance, matte or high-gloss effects).

[0003] Currently, the coating of in-ear headphone shells is mostly completed using fixed fixtures in conjunction with reciprocating spraying devices. However, with the increasing diversity of headphone designs, many shell surfaces have complex structures such as curved surfaces, sharp edges, or localized depressions. Traditional reciprocating spraying methods struggle to evenly cover the recessed areas and sidewalls with paint, resulting in uneven paint film thickness, missed areas, or paint buildup, affecting appearance consistency and protective performance. Furthermore, the relative position between the spraying components and the workpiece in existing equipment is usually fixed. When dealing with shells with deep depressions or sloping sidewalls, the nozzles cannot automatically adjust to maintain the optimal distance and angle to different spraying points. This not only affects the uniformity and adhesion of the coating but also limits the process's adaptability to complex workpiece structures.

[0004] Based on the above situation, there is an urgent need to propose an improvement scheme to address the problems of blind spots, poor uniformity, and insufficient adaptability of existing spraying devices when dealing with complex headphone shells, so as to achieve efficient, comprehensive, and high-quality automated surface treatment. Summary of the Invention

[0005] In order to overcome the shortcomings of traditional fixed-position spraying methods that are difficult to effectively process headphone shells with complex concave or sloping surfaces, the technical problem is to provide an in-ear headphone shell processing device.

[0006] An in-ear headphone shell processing device includes a spraying box, and further includes: a rotary drive mechanism installed inside the spraying box for driving the workpiece to revolve and switch workstations; a spraying execution mechanism installed in the upper part of the spraying box for reciprocating scanning spraying of the workpiece; a tilt adjustment mechanism, the execution component of which is installed on the workpiece clamping unit carried by the rotary drive mechanism for adjusting the tilt angle of the workpiece; a nozzle height follow-up linkage mechanism, the drive input end of which is connected to the drive source of the tilt adjustment mechanism, and the execution output end of which is connected to the spraying unit of the spraying execution mechanism for making the nozzle height compensate for changes in the tilt angle of the workpiece; and a workstation adaptive positioning mechanism installed on the workpiece clamping unit for automatically releasing the constraint on the workpiece at the loading and unloading station and automatically locking the workpiece at the spraying station.

[0007] In a preferred embodiment of the present invention, the rotary drive mechanism includes a first motor, a rotary support fixed to the output shaft of the first motor, four sets of connecting plates symmetrically fixed to the front and rear sides of the rotary support, fixed seats fixed to each connecting plate, and a rotary support rotatably connected to each fixed seat via bearings.

[0008] In a preferred embodiment of the present invention, the spraying actuator includes a movable frame slidably connected to the upper part of the spraying box in the horizontal direction, two sets of spraying components slidably connected to the movable frame, a reciprocating screw rotatably connected to the upper part of the spraying box and threadedly connected to the movable frame, and a second motor for driving the reciprocating screw; the spraying components are provided with atomizing nozzles and conduits connected to an external paint supply system.

[0009] In a preferred embodiment of the present invention, the tilt adjustment mechanism includes: a lifting rod that is vertically slidably connected to each connecting plate; a slider that is longitudinally slidably connected to each rotating bracket and rotatably connected to the upper end of the corresponding lifting rod; a first screw that is threadedly connected to each lifting rod; and a drive assembly for driving the first screw to rotate; wherein the lifting of the lifting rod is achieved by the slider driving the rotating bracket to deflect around the axis of the fixed base.

[0010] In a preferred embodiment of the present invention, the drive assembly includes a third motor, a drive shaft driven by the third motor, a transmission shaft linked to the drive shaft via a synchronous belt, a missing gear fixed to the top of the transmission shaft, and a connecting gear fixed to the bottom of the first screw and meshing with the missing gear; the drive shaft and the transmission shaft achieve power synchronization through a synchronous pulley and a synchronous belt.

[0011] In a preferred embodiment of the present invention, the nozzle height follow-up linkage mechanism includes: a second screw coaxially fixed on the drive shaft; a guide frame threadedly connected to the second screw and slidably connected vertically inside the spray box; a connecting rod fixed to the paint assembly located on the rear side and slidably embedded in the horizontal guide groove of the guide frame at its rear end; a guide wheel located on the top of the movable frame; and a pull rope connecting the front and rear paint assemblies and passing around the guide wheel.

[0012] In a preferred embodiment of the present invention, the positioning and locking mechanism includes: a first limiting frame and a second limiting frame rotatably connected to both ends of each rotating bracket; a transmission wheel coaxially fixed to the first limiting frame and the second limiting frame and linked by a belt; a rotating gear fixed to the lower end of each first limiting frame; a torsion spring connecting each first limiting frame and the rotating bracket and providing a closing preload; and a fixed rack fixed to the front side of the spray box for meshing with the rotating gear.

[0013] The beneficial effects are as follows: This device achieves dynamic optimization of the spraying process through the precise coordination of the tilt adjustment mechanism and the nozzle height follow-up linkage mechanism. When the rotating bracket drives the workpiece to tilt to adapt to the concave structure, the linkage mechanism can synchronously and in reverse adjust the height of the front and rear spraying components, so that the nozzle and each key area of ​​the workpiece surface always maintain a constant optimal spraying distance. This design fundamentally eliminates defects such as dripping, dry spraying, and uneven coverage caused by distance fluctuations, ensuring uniform adhesion, excellent leveling, and consistent appearance of the coating on complex curved surfaces, and greatly improving product yield and high-end texture.

[0014] The device integrates a rotary drive and an adaptive positioning mechanism, creating a highly efficient cyclical operation process. Rotary indexing enables automatic switching between loading / unloading and spraying stations, while the positioning mechanism automatically locks and releases the fixture according to the station. This design ensures seamless connection between workpiece loading / unloading, transfer, positioning, spraying, and curing processes, significantly reducing manual intervention and waiting time. It provides a core guarantee for uninterrupted, continuous, and automated production, thereby effectively improving equipment utilization and overall capacity.

[0015] The adaptive positioning mechanism effectively solves the risk of workpiece tipping during tilted spraying. Reliable locking is achieved through mechanical linkage, avoiding production interruptions, material damage, and manual cleaning burden caused by workpiece scattering. At the same time, the automatic spraying distance maintenance function reduces reliance on operator experience and reduces fluctuations in process parameters. The automation and linkage design of the entire device not only improves the stability and safety of the production process but also simplifies operation steps, reduces labor intensity and reliance on skilled workers, and helps ensure long-term stability of product quality. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a three-dimensional structural diagram of the first motor, rotating bracket, and connecting plate of the present invention.

[0018] Figure 3 This is a three-dimensional structural diagram of the third motor, drive shaft, and synchronous belt components of the present invention.

[0019] Figure 4 This is a three-dimensional structural diagram of the slider, first screw, and lifting rod of the present invention.

[0020] Figure 5 This is a three-dimensional structural diagram of the second screw, guide frame, and pull rope components of the present invention.

[0021] Figure 6 This is a three-dimensional structural diagram of the first limiting frame, fixed rack, and rotating gear of the present invention.

[0022] The components are as follows: 1. Spraying box; 11. First motor; 12. Rotating bracket; 13. Second motor; 14. Reciprocating screw; 15. Moving frame; 16. Spraying assembly; 17. Connecting plate; 2. Third motor; 21. Synchronous pulley; 22. Synchronous belt; 23. Rotating bracket; 24. Fixed seat; 25. Slider; 26. Lifting rod; 27. First screw; 28. Gear; 29. ​​Connecting gear; 210. Drive shaft; 211. Transmission shaft; 3. Second screw; 31. Guide frame; 32. Connecting rod; 33. Pull rope; 34. Guide wheel; 4. Fixed rack; 41. Rotating gear; 42. Torsion spring; 43. Transmission wheel; 44. Belt; 45. First limiting frame; 451. Second limiting frame. Detailed Implementation

[0023] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] Example 1: A processing device for in-ear headphone shells, such as Figures 1-4 As shown, it includes a spray box 1, in which a first motor 11 is installed. Its output shaft is fixed to a rotating bracket 12 via a coupling, which is used to drive the workpiece to revolve. The front and rear sides of the rotating bracket 12 are symmetrically fixed to connecting plates 17. Each connecting plate 17 is fixed to a fixed seat 24, and each of them is rotatably connected to a rotating bracket 23 for placing a positioning fixture via bearings.

[0025] The upper part of the spray box 1 is horizontally slidably connected to a movable frame 15, on which two sets of spray painting components 16 are slidably connected to each other, enabling multi-station synchronous spraying. Each spray painting component 16 is equipped with a paint guide tube symmetrically distributed from left to right, with an atomizing nozzle at its lower end. The upper end of the guide tube can be connected to the discharge pipe of an external paint supply system. A reciprocating screw 14 is rotatably connected to the upper part of the spray box 1, and is threadedly connected to the movable frame 15. A second motor 13 is installed on the right wall of the spray box 1, and its output shaft is fixed to the reciprocating screw 14 through a coupling, used to drive the movable frame 15 and the spray painting components 16 to perform horizontal reciprocating scanning motion.

[0026] Each connecting plate 17 is equipped with a tilt adjustment mechanism for controlling the pitch angle of the rotating bracket 23. The tilt adjustment mechanism includes a lifting rod 26 that is vertically slidably connected to the guide groove of each connecting plate 17. Each rotating bracket 23 has a slider 25 that is longitudinally slidably connected to the side away from each other, and the slider 25 is rotatably connected to the upper end of the adjacent lifting rod 26 through a pin.

[0027] When the tilt angle needs to be adjusted, the lifting rod 26 moves upward, pushing the rear end of the rotating bracket 23 upward via the slider 25. This forces the rotating bracket 23 to deflect forward around the axis of the fixed base 24. At this time, the rotating bracket 23 and its positioning fixture are tilted relative to the earphone shell, with the front lower than the back. During this process, the slider 25 slides longitudinally within the groove of the rotating bracket 23 to adapt to the tilt angle change. This posture allows the nozzle of the paint spraying assembly 16 to better align with the rear side and recessed areas of the earphone shell, achieving seamless spraying. Similarly, when the lifting rod 26 moves downward, it pulls down the rear end of the rotating bracket 23 via the slider 25, causing it to deflect backward and form a tilted state with the front higher than the back, optimizing the spraying coverage of the front structure of the earphone shell.

[0028] Within each connecting plate 17, a vertical first screw 27 is rotatably connected via a bearing seat on the side near the lifting rod 26, forming a threaded transmission pair with the corresponding lifting rod 26. By driving the first screw 27 to rotate forward and backward, the lifting stroke of the lifting rod 26 can be precisely controlled.

[0029] The spray box 1 is equipped with a synchronous tilt drive assembly that controls the synchronous rotation of the first screw 27 on the rear side. This drive assembly includes symmetrically arranged transmission shafts 211 connected to the rear of the spray box 1 via bearings, each with a missing gear 28 fixedly attached to its top. Each first screw 27 has a connecting gear 29 fixedly attached to its bottom end, and the two rear connecting gears 29 mesh with the missing gear 28 on the same side.

[0030] A third motor 2 is installed on the spray box 1, and its output shaft is fixedly connected to a vertical drive shaft 210 via a coupling. Synchronous pulleys 21 are fixedly connected to the lower ends of the drive shaft 210 and the two transmission shafts 211. A synchronous belt 22 is wound around the three synchronous pulleys 21, thereby synchronously transmitting the power of the third motor 2 to the two transmission shafts 211. Then, through the intermittent meshing of the missing gear 28 and the connecting gear 29, the first screw 27 is driven to rotate, thereby realizing the synchronous adjustment of the tilt angle of the rear station rotating bracket 23.

[0031] Initially, all rotating brackets 23 are horizontal, supported by the fixed base 24 and the lifting rod 26. The operator then installs the positioning fixture, which has been neatly loaded with earphone shells, onto the two rotating brackets 23 located on the front operating side.

[0032] The first motor 11 is started, driving the rotating bracket 12 and connecting plate 17 to rotate 180°. This action completes one rotation indexing, rotating the front rotating bracket 23 with the clamped workpiece to the rear spraying station, directly below the paint spraying assembly 16. Simultaneously, the rear rotating bracket 23, which has been sprayed or was initially empty, is rotated to the front loading and unloading station, realizing the alternation of loading / unloading and spraying stations. The operator can then clamp the next batch of workpieces on the empty front rotating bracket 23, achieving continuous production.

[0033] The earphone shell on the rotating bracket 23 at the spraying station is ready. The external paint supply system continuously supplies paint to the spraying assembly 16 through the discharge pipe and conduit. The second motor 13 is started, driving the reciprocating screw 14 to rotate, which in turn drives the moving frame 15 and the spraying assembly 16 to perform a reciprocating scanning motion in the horizontal direction. During this process, the nozzles of the spraying assembly 16 perform reciprocating scanning spraying on the stationary earphone shell below, achieving initial uniform coverage of the paint.

[0034] To achieve seamless spraying of complex curved surfaces (such as recesses and sidewalls) on the headphone shell, a synchronous tilt drive assembly can be activated. The third motor 2 drives the connecting gear 29 at the rear workstation and the first screw 27 to rotate via a synchronous belt 22, drive shaft 211, and a missing gear 28, thereby precisely controlling the lifting rod 26. The lifting rod 26, linked by a slider 25, forces the rotating bracket 23 to tilt around the axis of the fixed base 24, causing the workpiece to tilt with the front lower than the back or vice versa. This dynamic tilt adjustment, combined with the horizontal scanning motion of the painting assembly 16, ensures that the nozzle maintains an optimal spraying angle with key areas of the workpiece surface during scanning, significantly improving the uniformity, coverage, and overall spraying effect of the coating on complex structures.

[0035] When automatically spraying paint onto the shell of an in-ear headphone with complex curved and concave structures, the rotating support 23 carrying the workpiece needs to be tilted to ensure complete paint coverage. However, this causes inconsistent spraying distances between the nozzle of the spraying assembly 16 and different parts of the tilted workpiece surface. Too close a distance can lead to defects such as coating runs and build-up, while too far a distance results in low paint utilization, a rough paint film, and poor edge coverage. Traditional fixed spraying assemblies cannot adapt to this change, resulting in uneven spraying quality.

[0036] Therefore, a mechanism is needed that enables the attitude of the painting assembly 16 to be linked and dynamically compensated with the tilting motion of the rotating bracket 23 in real time, so as to maintain the distance between the nozzle and the key area of ​​the workpiece surface within the optimal range throughout the painting process, thereby ensuring the uniformity and high quality of the coating on the complex structure shell.

[0037] To address the aforementioned technical challenges and achieve synchronous adaptive adjustment of the nozzle and workpiece tilt, this device integrates a precision nozzle height follow-up linkage mechanism. This mechanism ensures that the painting assembly 16 can dynamically compensate for distance changes caused by workpiece tilt, thereby maintaining the spraying distance within the optimal range at all times.

[0038] like Figure 3 and 5As shown, specifically, the nozzle height-following linkage mechanism includes a second screw 3 coaxially fixed to the middle of the drive shaft 210. A guide frame 31 is vertically slidably connected to the rear of the spray box 1, forming a threaded transmission pair with the second screw 3. Symmetrical connecting rods 32 are fixedly connected to the rear-mounted paint assembly 16. A horizontal guide groove is formed inside the guide frame 31, and the rear ends of each connecting rod 32 are slidably embedded in this guide groove, forming a sliding hinge point. This allows the connecting rods 32 to rise and fall with the guide frame 31 while also allowing the paint assembly 16 to slide freely in the horizontal direction.

[0039] In addition, two sets of guide wheels are symmetrically arranged on the top of the movable frame 15, each set containing two guide wheels 34 distributed front and rear. Between the front and rear painting components 16, symmetrical pull ropes 33 are fixedly connected, and the pull ropes 33 pass around the adjacent guide wheels 34 on the same side, thus forming a closed-loop flexible constraint system.

[0040] When the third motor 2 starts and the drive shaft 210 rotates in the forward direction, its power drives the tilt adjustment mechanism of the rear workstation through the synchronous belt 22 transmission system, causing the rear rotating support 23 to tilt in a forward-lower-rear-higher posture. At the same time, the drive shaft 210 drives the second screw 3 to rotate synchronously.

[0041] The rotation of the second screw 3 drives the guide frame 31, which meshes with it, to move upward. The upward-moving guide frame 31 pushes the paint spraying assembly 16 on the rear side to slide upward synchronously along the moving frame 15 via the connecting rod 32. At this time, the rear end of the connecting rod 32 slides relative to the guide groove of the second screw 3.

[0042] Due to the closed-loop constraint formed by the pull rope 33, the upward movement of the rear painting assembly 16 pulls the pull rope 33, and through the transmission of the guide wheel 34, overcomes the gravity of the front painting assembly 16, causing it to slide downward synchronously. This achieves opposite, equal-amplitude displacements of the front and rear painting assemblies 16 in the vertical direction.

[0043] When the rotating bracket 23 tilts forward (lower in the front and higher in the back), the rear painting assembly 16 rises, and the front painting assembly 16 falls. This combined movement precisely compensates for the problem of the near end being too far and the far end being too close caused by the tilting of the workpiece, keeping the vertical distance between the nozzles of the two painting assemblies 16 and their corresponding target workpiece areas dynamically constant. Through this mechatronics linkage design, it is ensured that the painting process parameters (especially the distance) at each point are always in the optimal range when painting complex curved surfaces, thereby fundamentally avoiding quality defects such as sagging, dry spraying, and uneven coverage.

[0044] Example 2: When using the tilt angle of the rotating bracket 23 to spray the earphone shell at multiple angles, the positioning fixture placed on it lacks effective restraint, posing a risk of tipping over and scattering workpieces due to tilting. This not only increases the workload of manual picking and resetting but also directly causes spraying interruptions and product defects. Therefore, a positioning mechanism needs to be designed that simultaneously meets the requirements of two working conditions: at the loading and unloading station in front, it should be able to automatically release the restraints to facilitate the quick loading and unloading of the fixture; at the spraying station in the rear, it should be able to automatically and reliably lock the fixture to ensure its stability during tilting movements. In addition, the state switching of this mechanism needs to be automatically linked with the rotational exchange action of the station to achieve a smooth and efficient production process.

[0045] like Figure 4 and Figure 6 As shown, specifically, a first limiting frame 45 is rotatably connected to the left end of the two left rotating supports 23 and the right end of the two right rotating supports 23 via a rotating shaft; a second limiting frame 451 is rotatably connected to the right end of the two left rotating supports 23 and the left end of the two right rotating supports 23, together forming an opposing clamping unit. A transmission wheel 43 is coaxially fixed to each of the first limiting frames 45 and the second limiting frame 451, and a synchronous belt 44 is wound between the two transmission wheels 43 located on the same rotating support 23, thereby achieving synchronous counter-rotation of the two limiting frames.

[0046] Each of the first limiting frames 45 has a rotating gear 41 fixedly connected to its lower end. Each of the first limiting frames 45 and its adjacent rotating support 23 is connected to a torsion spring 42. Each torsion spring 42 is wrapped around the rotating shaft of the adjacent first limiting frame 45. Its preload always drives the first limiting frame 45 to rotate inward, which in turn drives the second limiting frame 451 to close inward synchronously through the belt 44 to clamp the positioning fixture.

[0047] A symmetrically fixed rack 4 is fixed to the front side of the spray box 1 (i.e., the area corresponding to the loading and unloading station). When the rotating bracket 23 rotates to the front side, the rotating gear 41 on it will mesh with the fixed rack 4.

[0048] The rotating bracket 23 located at the front loading and unloading station has a rotating gear 41 that meshes with a fixed rack 4. This meshing action overcomes the preload of the torsion spring 42, forcing the first limiting frame 45 to rotate outward, and via the belt 44, driving the second limiting frame 451 to unfold outward synchronously, thereby putting the pair of clamping arms in the open state, facilitating the worker to pick up and put down the positioning fixture. At this time, the torsion spring 42 is in a torsional state.

[0049] When the first motor 11 drives the rotating bracket 12 to rotate 180°, the rotating bracket 23 originally located at the front and the entire clamping mechanism are moved to the rear spraying station. During this process, its rotating gear 41 disengages from the fixed rack 4. The restoring force of the torsion spring 42 is immediately released, driving the first limiting frame 45 to rotate inward, and through the belt 44, driving the second limiting frame 451 to close inward synchronously, thereby automatically locking the positioning fixture inside the rotating bracket 23. This state ensures that even if the rotating bracket 23 is tilted during subsequent spraying, the fixture remains stable.

[0050] At the same time, the rotating bracket 23, which was originally located at the rear and had been sprayed, was moved to the front. The rotating gear 41 on it then engaged with the fixed rack 4. The engagement action overcame the force of the torsion spring 42, causing the clamping arm to automatically switch back to the open state, making it easier for the workers to remove the sprayed fixture and install the new fixture.

[0051] In summary, this mechanism achieves fully automatic and precise linkage between the clamping arm state and the rotating bracket 23 position through the engagement / disengagement of the rotating gear 41 and the fixed rack 4. While ensuring the reliability of the spraying process, it greatly improves the loading and unloading efficiency, making continuous automated production possible.

[0052] Although this disclosure has been shown and described with reference to specific exemplary embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made to this disclosure without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents. Therefore, the scope of this disclosure should not be limited to the above embodiments, but should be defined not only by the appended claims, but also by their equivalents.

Claims

1. A processing apparatus for the shell of an in-ear headphone, comprising a spray coating box (1), characterized in that, Also includes: A rotary drive mechanism is installed inside the spray box (1) to drive the workpiece to revolve and switch work positions; The spraying actuator is installed in the upper part of the spraying box (1) and is used to perform reciprocating scanning spraying on the workpiece; The tilt adjustment mechanism, whose actuating component is mounted on the workpiece clamping unit carried by the rotary drive mechanism, is used to adjust the pitch angle of the workpiece. The nozzle height follow-up linkage mechanism has its drive input end connected to the drive source of the tilt angle adjustment mechanism, and its execution output end connected to the painting unit of the spraying execution mechanism, which is used to make the nozzle height compensate for changes in the workpiece tilt angle. And a workstation adaptive positioning mechanism, installed on the workpiece clamping unit, is used to automatically release the constraint on the workpiece at the loading and unloading station and automatically lock the workpiece at the spraying station.

2. The in-ear headphone shell processing device as described in claim 1, characterized in that, The rotary drive mechanism includes a first motor (11), a rotary support (12) fixed to the output shaft of the first motor (11), four sets of connecting plates (17) symmetrically fixed to the front and rear sides of the rotary support (12), fixed seats (24) fixed to each connecting plate (17), and a rotary support (23) rotatably connected to each fixed seat (24) via bearings.

3. The in-ear headphone shell processing device as described in claim 1, characterized in that, The spraying actuator includes a movable frame (15) that is slidably connected to the upper part of the spray box (1) in the horizontal direction, two sets of spraying components (16) that are slidably connected to the movable frame (15), a reciprocating screw (14) that is rotatably connected to the upper part of the spray box (1) and threadedly connected to the movable frame (15), and a second motor (13) for driving the reciprocating screw (14); the spraying component (16) is provided with an atomizing nozzle and a conduit connected to an external paint supply system.

4. The in-ear headphone shell processing device as described in claim 2, characterized in that, The tilt adjustment mechanism includes: The lifting rod (26) is vertically slidably connected to each connecting plate (17); A slider (25) is longitudinally slidably connected to each rotating bracket (23) and rotatably connected to the upper end of the corresponding lifting rod (26); The first screw (27) is threadedly connected to each lifting rod (26); And a drive assembly for driving the first screw (27) to rotate; The lifting rod (26) is raised and lowered by the slider (25) driving the rotating bracket (23) to deflect around the axis of the fixed seat (24).

5. The in-ear headphone shell processing device as described in claim 4, characterized in that, The drive assembly includes a third motor (2), a drive shaft (210) driven by the third motor (2), a transmission shaft (211) linked to the drive shaft (210) via a synchronous belt (22), a missing gear (28) fixed to the top of the transmission shaft (211), and a connecting gear (29) fixed to the bottom of the first screw (27) and meshing with the missing gear (28); the drive shaft (210) and the transmission shaft (211) achieve power synchronization through a synchronous pulley (21) and a synchronous belt (22).

6. The in-ear headphone shell processing apparatus as described in claim 5, characterized in that, The nozzle height follow-up linkage mechanism includes: A second screw (3) is coaxially fixed on the drive shaft (210); A guide frame (31) is threaded to the second screw (3) and slidably connected to the spray box (1) in a vertical manner; a connecting rod (32) is fixed to the paint assembly (16) located on the rear side and slidably embedded in the horizontal guide groove of the guide frame (31) at its rear end. Guide wheels (34) are located on the top of the movable frame (15). And a pull rope (33) that connects the front and rear paint spraying assemblies (16) and goes around the guide wheel (34).

7. The in-ear headphone shell processing device as described in claim 2, characterized in that, The positioning and locking mechanism includes: A first limiting frame (45) and a second limiting frame (451) are rotatably connected to both ends of each rotating bracket (23); a transmission wheel (43) is coaxially fixed to the first limiting frame (45) and the second limiting frame (451) and linked by a belt (44). Rotary gears (41) are fixed to the lower end of each first limiting frame (45). A torsion spring (42) that connects each of the first limiting frames (45) and the rotating bracket (23) and provides a closing preload; and a fixed rack (4) that is fixed to the front side of the spray box (1) for meshing with the rotating gear (41).

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