Earphone processing shell forming device facilitating demolding

Abstract

The application relates to an injection molding device, in particular to a shell forming device convenient for demolding for earphone processing. The shell forming device convenient for demolding for earphone processing comprises a support and the like; a lower die is slidably arranged at the lower part of the support, positioning holes are arranged at the top four corners of the lower die, the upper edges of the positioning holes are rounded, air cylinders are symmetrically arranged at the upper part of the support, the extension ends of the air cylinders face downward, an upper die is connected between the extension ends of the air cylinders, positioning shafts are arranged at the bottom four corners of the upper die, the bottom ends of the positioning shafts are semicircular, and the upper die and the support are slidably connected. The servo air cylinder drives the adapter disc to move upward, thereby driving the ejection rod and the cushion block to move upward, the injection-molded shell can be quickly ejected, and the demolding work is completed; when upward force is applied to the bottom of the shell for demolding, the push plate applies demolding force to the shell from the side, so that the shell is more uniformly stressed during demolding and is not damaged.

Description

Technical Field

[0001] This invention relates to an injection molding apparatus, and more particularly to a shell molding apparatus for earphone processing that facilitates demolding. Background Technology

[0002] In the headphone manufacturing process, shell molding is a crucial step. Currently, common headphone shell molding processes mainly include injection molding, 3D printing, and die casting. Among these, injection molding, with its high efficiency, precision, and suitability for mass production, has become the most widely used method. However, regardless of the molding process used, the demolding process faces numerous challenges.

[0003] To enhance the comfort and aesthetics of headphones, headphone shells are often designed to be thinner and more personalized. This results in complex shell structures, such as internal reinforcing ribs and snap-fit ​​mechanisms, and external streamlined or irregular curved surfaces, increasing the difficulty of demolding. Furthermore, as demands for sound quality increase, some high-end headphone shells utilize special materials, such as high-strength plastics and composite materials. The properties of these materials also present new challenges for demolding.

[0004] Due to the complex structure of the headphone shell, certain parts of the shell can easily stick to the mold during demolding, especially areas with features such as undercuts or side holes. Forcing demolding can easily cause deformation, cracking, or surface scratches, leading to product scrap and increased production costs. Therefore, uneven distribution of demolding force during the demolding process can result in inconsistent stress on different parts of the headphone shell, causing defects such as warping. This not only affects the appearance quality of the headphones but may also lead to improper installation of internal components, impacting the headphones' performance and lifespan.

[0005] In summary, there is an urgent need to develop a shell molding device for earphone processing that facilitates demolding, in order to solve the aforementioned technical problems. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a shell molding apparatus for earphone processing that facilitates demolding.

[0007] The technical solution of the present invention is: a shell molding device for earphone processing that facilitates demolding, comprising a support, a lower mold, a cylinder, an upper mold, and an ejection assembly. The lower mold is slidably disposed at the lower part of the support, and cylinders are symmetrically disposed at the upper part of the support. The upper mold is connected between the telescopic ends of the cylinders. The upper mold and the support are slidably connected. An ejection assembly is installed in the internal space formed by the lower mold and the support. The upper surface of the ejection assembly is in contact with the inner surface of the lower mold. The ejection assembly includes a track, a servo cylinder, a converter plate, an ejection rod, and a pad. The track is fixedly connected to the support at the lower part of the lower mold by bolts. The servo cylinder is slidably connected in the track. The converter plate is connected to the output shaft at the top of the servo cylinder. Ejection rods are evenly spaced on the top of the converter plate. A pad is connected to the top of the ejection rod. The upper surface of the pad is on the same arc-shaped plane as the inner surface of the lower mold.

[0008] Furthermore, positioning holes are provided at the four corners of the top of the lower mold, and the upper edges of the positioning holes are rounded. Positioning shafts are provided at the four corners of the bottom of the upper mold, and the bottom of the positioning shafts is semi-circular.

[0009] Furthermore, it also includes a mold release agent addition component. Mold release agent addition components are provided on both the left and right sides of the lower mold. The mold release agent addition component includes a mounting base, a storage cylinder, spring I, a discharge pipe, a nozzle, and a wedge seat. The mounting base is fixedly connected to both the left and right sides of the lower mold by bolts. The storage cylinder is slidably connected to the top of the mounting base. Spring I is connected between the storage cylinder and the mounting base. The discharge pipe extending towards the lower mold is connected to the bottom of the storage cylinder. The nozzle with a valve is connected to the end of the discharge pipe. A wedge seat is installed on the storage cylinder.

[0010] Furthermore, the inclined surface of the wedge seat faces the upper mold, and initially the upper mold and the wedge seat partially overlap in the vertical direction.

[0011] Furthermore, it also includes a side-mounted top assembly. The side-mounted top assembly is installed on the support inside the lower mold. The side-mounted top assembly includes a concave block, an elastic telescopic rod, a sliding shaft, and a push plate. At least two concave blocks are evenly spaced around the circumference of the adapter plate. An elastic telescopic rod is provided on the inner side of the lower mold outside the concave block. The telescopic end of the elastic telescopic rod is equipped with a sliding shaft, which is above the concave block. The end of the elastic telescopic rod is connected to a push plate. The upper surface of the push plate is on the same arc-shaped plane as the inner surface of the lower mold.

[0012] Furthermore, the elastic telescopic rod is installed at an angle to the inner wall of the lower mold.

[0013] Furthermore, it also includes a preheating component. The preheating component is installed on the side of the lower mold. The preheating component includes a sleeve, a temperature controller, and a heating tube. The sleeve is installed on the side of the lower mold, the heating tube is installed inside the sleeve, and the temperature controller is installed on the heating tube.

[0014] Furthermore, it also includes a vibration assembly, which is installed on the support. The vibration assembly includes a vibrator and a spring II. The vibrator is fixedly installed on the rear side of the support, and the spring II is connected between the lower mold and the support.

[0015] 1. This invention uses a servo electric cylinder to drive the adapter plate to move upward, which in turn drives the ejector rod and pad to move upward, so as to quickly eject the injection-molded shell and complete the demolding work; when applying an upward force to the bottom of the shell for demolding, the push plate applies a demolding force to the shell from the side, so that the shell is subjected to more uniform force during demolding and will not be damaged.

[0016] 2. Under the action of the wedge seat, the storage cylinder and its upper parts will automatically move outward after the release agent is added, without affecting the mold closing operation. When the upper mold moves upward to reset, the storage cylinder and its upper parts will move inward to reset under the action of spring I, so that the release agent can be added next time. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a three-dimensional structural diagram of the upper component of the lower mold of the present invention.

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure inside the lower mold of the present invention.

[0020] Figure 4 This is a three-dimensional structural diagram of the release agent addition component of the present invention.

[0021] Figure 5 This is a three-dimensional structural diagram of the ejector component of the present invention.

[0022] Figure 6 This is a three-dimensional structural diagram of the side-top component of the present invention.

[0023] Figure 7 This is a top view of the vibration component of the present invention.

[0024] Figure 8 This is a three-dimensional structural diagram of the preheating component of the present invention.

[0025] The meanings of the reference numerals in the figure are as follows: 1: Support, 2: Lower mold, 201: Positioning hole, 3: Cylinder, 4: Upper mold, 401: Positioning shaft, 5: Ejection assembly, 51: Track, 52: Servo electric cylinder, 53: Adapter plate, 54: Ejection rod, 55: Pad, 6: Release agent addition assembly, 61: Mounting seat, 62: Storage cylinder, 63: Spring I, 64: Feed tube, 65: Nozzle, 66: Wedge seat, 7: Side upper ejection assembly, 71: Concave block, 72: Elastic telescopic rod, 73: Sliding shaft, 74: Push plate, 8: Preheating assembly, 81: Sleeve, 82: Temperature controller, 83: Heating tube, 9: Vibration assembly, 91: Vibrator, 92: Spring II. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It is hereby declared that the directional terms such as up, down, left, right, front, back, inside, and outside used in this text are based solely on the accompanying drawings and are not intended to specifically limit the invention.

[0027] Example 1: A shell molding device for earphone processing that facilitates demolding, such as... Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, it includes a support 1, a lower mold 2, a cylinder 3, an upper mold 4, and an ejector assembly 5. The lower mold 2 is slidably mounted on the lower part of the support 1. Positioning holes 201 are provided at the four corners of the top of the lower mold 2. The upper edge of the positioning holes 201 is rounded. Cylinders 3 are symmetrically mounted on the upper part of the support 1. The telescopic ends of the cylinders 3 face downwards. The upper mold 4 is connected between the telescopic ends of the cylinders 3. Positioning shafts 401 are provided at the four corners of the bottom of the upper mold 4. The bottom end of the positioning shafts 401 is semi-circular. The upper mold 4 and the support 1 are slidably connected. The ejector assembly 5 is installed in the internal space formed by the lower mold 2 and the support 1. The upper surface of the ejector assembly 5 is in contact with the inner surface of the lower mold 2.

[0028] like Figure 3 and Figure 5 As shown, the ejector assembly 5 includes a track 51, a servo cylinder 52, a transfer plate 53, ejector rods 54, and a pad 55. The track 51 is fixedly connected to the support 1 at the lower part of the lower mold 2 by bolts. The servo cylinder 52 is slidably connected inside the track 51. The output shaft at the top of the servo cylinder 52 is connected to the transfer plate 53. Ejector rods 54 are evenly spaced on the top of the transfer plate 53. The top of the ejector rods 54 is connected to the pad 55. The upper surface of the pad 55 is on the same arc-shaped plane as the inner surface of the lower mold 2.

[0029] When using this device to injection mold the earphone shell, the injection tube is first connected to the upper mold 4. Then, the cylinder 3 is extended, causing the upper mold 4 to move downwards for mold closing. During the mold closing process between the upper mold 4 and the lower mold 2, because the bottom end of the positioning shaft 401 is semi-circular and the edge of the positioning hole 201 is rounded, if there is a slight positional deviation between the upper mold 4 and the lower mold 2, the upper mold 4 and the lower mold 2 will automatically adjust due to the action of the positioning shaft 401 and the positioning hole 201, allowing the upper mold 4 and the lower mold 2 to close more precisely. After the upper mold 4 and lower mold 2 are closed, the control cylinder 3 stops working. Then, the material is injected into the space between the upper mold 4 and lower mold 2. After the material in the internal space cools and solidifies, the control cylinder 3 shortens and resets, driving the upper mold 4 to move upward and reset. Then, the control servo cylinder 52 starts working, driving the adapter plate 53 to move upward, which in turn drives the ejector rod 54 and the pad 55 to move upward, ejecting the molded shell and completing the demolding work. Then, the control servo cylinder 52 drives the adapter plate 53 to move downward and reset.

[0030] Example 2: Based on Example 1, such as Figure 4 As shown, it also includes a mold release agent adding component 6. Mold release agent adding components 6 are provided on both the left and right sides of the lower mold 2. Each mold release agent adding component 6 includes a mounting base 61, a storage cylinder 62, a spring I 63, a discharge pipe 64, a nozzle 65, and a wedge seat 66. The mounting base 61 is bolted to both the left and right sides of the lower mold 2. A storage cylinder 62 is slidably connected to the top of each mounting base 61. The storage cylinder 62 stores the mold release agent. A spring I 63 connects the storage cylinder 62 to the mounting base 61. A discharge pipe 64 extending towards the lower mold 2 is connected to the bottom of the storage cylinder 62. A nozzle 65 is connected to the end of the discharge pipe 64, and an electric valve is installed on the nozzle 65. A wedge seat 66 is installed on the storage cylinder 62, with its inclined surface facing the upper mold 4. Initially, the upper mold 4 and the wedge seat 66 partially overlap in the vertical direction. Before the lower mold 2 is closed, the electric valve on the feed pipe 64 is opened, allowing the release agent in the storage cylinder 62 to enter the lower mold 2 through the feed pipe 64 and nozzle 65. After the release agent is added, the electric valve is closed, and no more release agent is added. Then, the cylinder 3 drives the upper mold 4 to move downward. During the downward movement of the upper mold 4, the bottom of the upper mold 4 contacts the inclined surface of the wedge seat 66, pushing the wedge seat 66 to move outward, causing the storage cylinder 62 and its components to move outward. The spring I 63 is compressed. In this way, after the release agent is added, the storage cylinder 62 and its components will automatically move outward without affecting the mold closing operation. When the upper mold 4 moves upward to reset, the spring I 63 drives the storage cylinder 62 and its components to move inward to reset, so that the release agent can be added next time.

[0031] like Figure 6As shown, it also includes a side-mounted top assembly 7. The side-mounted top assembly 7 is installed on the support 1 inside the lower mold 2. The side-mounted top assembly 7 includes a concave block 71, an elastic telescopic rod 72, a sliding shaft 73, and a push plate 74. At least two concave blocks 71 are evenly spaced around the circumference of the adapter plate 53. An elastic telescopic rod 72 is inclinedly arranged on the inner sidewall of the lower mold 2 outside the concave block 71. The telescopic end of the elastic telescopic rod 72 is equipped with a sliding shaft 73. The sliding shaft 73 is above the concave block 71. The end of the elastic telescopic rod 72 is connected to the push plate 74. The upper surface of the push plate 74 is flush with the inner surface of the lower mold 2. On the same arc-shaped plane; when the adapter plate 53 moves upward to push out the molded shell, it drives the concave block 71 to move upward. The upward movement of the concave block 71 drives the sliding shaft 73 to move upward, causing the elastic telescopic rod 72 to tilt and move upward to extend, driving the push plate 74 to move upward for demolding. In this way, when an upward force is applied to the bottom of the shell for demolding, the push plate 74 applies a demolding force to the shell from the side, making the shell more evenly stressed during demolding and preventing damage. When the adapter plate 53 moves downward to reset, the elastic telescopic rod 72 shortens downward to reset, driving the push plate 74 to reset.

[0032] like Figure 8 As shown, it also includes a preheating component 8. The preheating component 8 is installed on the side of the lower mold 2. The preheating component 8 includes a sleeve 81, a temperature controller 82, and a heating tube 83. The sleeve 81 is installed on the side of the lower mold 2, and the heating tube 83 is installed inside the sleeve 81. The temperature controller 82 is installed on the heating tube 83. Before injection molding the earphone shell, after the lower mold 2 and the upper mold 4 have completed the mold closing work, the heating tube 83 can be controlled by the temperature controller 82 to heat the lower mold 2 and the upper mold 4 to preheat them. After the lower mold 2 and the upper mold 4 have been preheated, the heating tube 83 is stopped by the temperature controller 82 before liquid injection. In this way, it can prevent the liquid from cooling down rapidly during injection due to the low temperature of the lower mold 2 and the upper mold 4, which would affect the injection molding quality of the shell.

[0033] like Figure 7 As shown, it also includes a vibration assembly 9. The vibration assembly 9 is installed on the support 1. The vibration assembly 9 includes a vibrator 91 and a spring II 92. The vibrator 91 is fixedly installed on the rear side of the support 1 by bolts. The spring II 92 is connected between the lower mold 2 and the support 1. When demolding the injection-molded shell, the vibrator 91 is controlled to work. Under the action of the spring II 92 and the vibrator 91, the lower mold 2 vibrates continuously, so that the molded shell can be demolded better. After the shell is demolded, the vibrator 91 is controlled to stop working.

[0034] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A shell forming device for earphone processing with easy demolding, comprising a support (1), a lower die (2), a gas cylinder (3), an upper die (4) and an ejection assembly (5), the lower die (2) is slidably arranged at the lower part of the support (1), the gas cylinder (3) is symmetrically arranged at the upper part of the support (1), the telescopic ends of the gas cylinder (3) are connected with the upper die (4), the upper die (4) is slidably connected with the support (1), the ejection assembly (5) is installed in the internal space formed by the lower die (2) and the support (1), and the upper surface of the ejection assembly (5) is attached to the inner surface of the lower die (2); characterized in that, The ejection assembly (5) comprises a track (51), a servo cylinder (52), an adapter disc (53), an ejection rod (54) and a cushion block (55), the track (51) is fixedly connected to the support (1) in the lower mold (2) by bolts, the servo cylinder (52) is slidably connected in the track (51), the output shaft at the top of the servo cylinder (52) is connected with the adapter disc (53), the adapter disc (53) is uniformly and spacedly arranged with the ejection rod (54) at the top, the ejection rod (54) is connected with the cushion block (55) at the top end, and the upper surface of the cushion block (55) is on the same arc plane with the inner surface of the lower mold (2); The lower mold (2) is provided with positioning holes (201) at the top of four corners, and the upper edges of the positioning holes (201) are rounded, and the bottom of the positioning shaft (401) is semicircular. Further comprising a side up-ejecting assembly (7) installed on the support (1) in the lower mold (2), the side up-ejecting assembly (7) comprises a concave block (71), an elastic telescopic rod (72), a sliding shaft (73) and a push plate (74), at least two concave blocks (71) are uniformly and spacedly arranged on the circumference of the adapter disc (53), the elastic telescopic rod (72) is arranged on the inner side of the lower mold (2) outside the concave block (71), the sliding shaft (73) is installed at the telescopic end of the elastic telescopic rod (72), the sliding shaft (73) is above the concave block (71), and the push plate (74) is connected to the end of the elastic telescopic rod (72), and the upper surface of the push plate (74) is on the same arc plane with the inner surface of the lower mold (2). The elastic telescopic rod (72) is obliquely installed with the inner side wall of the lower mold (2); Further comprising a vibration assembly (9) installed on the support (1), the vibration assembly (9) comprises a vibrator (91) and a spring II (92), the vibrator (91) is fixedly installed on the rear side of the support (1), and the spring II (92) is connected between the lower mold (2) and the support (1).

2. The shell molding apparatus for earphone processing with easy demolding according to claim 1, characterized in that, Further comprising a release agent adding assembly (6) arranged on the left and right sides of the lower mold (2), the release agent adding assembly (6) comprises a mounting seat (61), a storage cylinder (62), a spring I (63), a discharging pipe (64), a nozzle (65) and a wedge-shaped seat (66), the mounting seat (61) is fixedly connected to the left and right sides of the lower mold (2) by bolts, the storage cylinder (62) is slidably connected to the top of the mounting seat (61), the spring I (63) is connected between the storage cylinder (62) and the mounting seat (61), the discharging pipe (64) extending towards the lower mold (2) is connected to the bottom of the storage cylinder (62), the nozzle (65) with a valve is connected to the end of the discharging pipe (64), and the wedge-shaped seat (66) is installed on the storage cylinder (62).

3. The easily demoldable case molding apparatus for earphone processing according to claim 2, characterized by, The inclined surface of the wedge-shaped seat (66) faces the upper mold (4), and initially the upper mold (4) partially coincides with the wedge-shaped seat (66) in the vertical direction.

4. The easily demoldable case molding apparatus for earphone processing according to claim 1, characterized by, The preheating assembly (8) is arranged on the side of the lower mold (2), and the preheating assembly (8) comprises a sleeve (81), a temperature controller (82) and a heating pipe (83). The sleeve (81) is arranged on the side of the lower mold (2), the heating pipe (83) is arranged in the sleeve (81), and the temperature controller (82) is arranged on the heating pipe (83).

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