Earphone auditory meatus injection molding process and equipment
By adopting automated cutting and electric heating wire heating technology in the ear canal injection molding process of ear canal, the defects caused by plastic coagulation in the traditional injection molding process are solved, and efficient and reliable ear canal injection molding of ear canals is achieved, improving product quality and production efficiency.
Patent Information
- Application Number
- CN202510211832.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2025-04-15
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the traditional earphone ear canal injection molding process, the rapid cooling of the plastic during the injection molding process leads to condensation, forming defects such as corrugation and cold material spots, which affect the product appearance quality and production efficiency.
The new earphone ear canal injection molding process and equipment are adopted, including the preheating stage, the injection molding stage, the pressure holding stage, the cooling stage and the mold release stage. The discharge pipe is heated by electric heating wire to achieve the reheating and fluidity of the plastic, combined with the design of automated cutting and synchronous movement, reducing the risk of manual operation and adhesion.
Through automated cutting and reheating technology, the condensation phenomenon is reduced, the surface quality and structural strength of injection molded parts are improved, the product defect rate and production cost are reduced, and the production efficiency is improved.
Smart Images
Figure CN119820804A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of earphone injection molding production, and in particular to an ear canal injection molding process and equipment for an earphone. Background Art
[0002] The ear canal of the earphone is usually produced using an injection mold. According to the design requirements of the earphone, a mold with a precise shape and size is manufactured. These molds are usually made of metal and can withstand the high temperature and pressure during the injection molding process. However, there is a large difference between the temperature of the mold and the temperature of the molten plastic. During the injection molding process, the molten plastic is injected into the mold from a high temperature state, while the temperature of the mold is relatively low, which causes the plastic to cool rapidly at the moment of contact with the mold, thereby forming condensation near the injection port; Condensation at the injection port may cause defects such as ripples and cold spots on the surface of the ear canal injection molded parts of the headphone, affecting the appearance quality and overall aesthetics of the product. In the traditional ear canal injection molding process of the headphone, in order to deal with this problem, manual or semi-automatic equipment is usually used for operation. The operator needs to manually control the movement of the injection molding machine and the plastic cutting process. This method is not only inefficient, but also prone to product defects due to improper operation. Condensation may cause the injection molding process to be unstable, requiring frequent shutdowns to clean the injection port, thereby increasing production time and cost and reducing production efficiency. To this end, we propose an ear canal injection molding process and equipment for headphones. Summary of the invention
[0003] The purpose of the present invention is to provide a new ear canal injection molding process and equipment for headphones, which can have efficient, reliable and easy-to-maintain truncation and reshaping functions to adapt to various complex working environments, ensure the stable operation of the equipment, and solve the problems raised in the above background technology.
[0004] To achieve the above object, the present invention provides the following technical solution: an ear canal injection molding process for earphones, comprising the following steps: S1: Preheating stage: The barrel is heated to the set temperature, and the plastic particles melt into a molten state in the barrel; S2: Injection stage: The screw injects the molten plastic into the mold cavity, and the vacuum device is started at the same time to reduce bubble generation and ensure that the plastic fully fills the mold cavity; S3: Holding pressure stage: Maintain injection pressure to ensure uniform distribution of plastic in the mold cavity and prevent shrinkage; S4: Cooling stage: The cooling water circuit and cooling fan are started to quickly cool the mold, so that the product can be quickly solidified and the production efficiency can be improved; S5: Demolding stage: the mold is opened and the molded product is taken out, completing the entire injection molding process.
[0005] On the other hand, the present application also provides an ear canal injection molding device for earphones, comprising an injection molding machine and an injection mold, wherein the injection mold comprises an upper mold and a lower mold, a connection block is fixedly connected to one side surface of the upper mold, a discharge assembly is fixedly connected to the middle of the connection block, and a connector is fixedly connected to one side surface of the discharge assembly; The discharging assembly comprises a discharging pipe, which is provided with two sections, wherein an outer side of one section of the discharging pipe is fixedly connected with an external sleeve, and a reflux ball is fixedly connected between the two sections of the discharging pipe.
[0006] In some embodiments, an electric push rod is fixedly connected to the interior of the connecting block, and a moving frame is fixedly connected to the output end of the electric push rod. The lower ends of both sides of the moving frame are movably connected to rotating plates. Two rotating plates are provided on one side of the moving frame and are symmetrically distributed, and the moving directions of the two rotating plates are opposite.
[0007] In some embodiments, one end of the rotating plate is movably connected to a tripod, one end of the tripod is provided with a connecting column, and the rotating plate and the tripod are movably connected by the cooperation between the notch at one end of the rotating plate and the connecting column.
[0008] In some embodiments, a truncated piece is fixedly connected to one side surface of the tripod, and two branch angles of the tripod are respectively fixed to the upper and lower ends of the truncated piece. There are two truncated pieces in total and they are symmetrically distributed.
[0009] In some embodiments, a baffle is fixedly connected to one side surface of the connecting block, a sliding groove is opened on one side surface of the baffle, both ends of the truncation piece are snapped into the inside of the sliding groove, and the truncation piece slides and moves inside the sliding groove, and limiting rings are fixedly connected on both sides of the position where the connecting block is located, the inner side of the limiting ring is adapted to one end of the connecting column, and one end of the connecting column is movably snapped into the inner side of the limiting ring.
[0010] In some embodiments, a heating wire is fixedly connected to the inner side of the external sleeve, and a fitting groove is provided on the outer surface of a section of the discharge pipe inside the external sleeve. The fitting groove provided on the outer side of the discharge pipe and the heating wire are adapted to each other, and the two can be tightly meshed together.
[0011] In some embodiments, a discharge head is fixedly connected to one side surface of the discharge pipe, the front end of the discharge head is configured as a step-type, a discharge port is provided on the outer side of the discharge head, three discharge ports are provided and face three different directions, and the three discharge ports are interconnected with the interior of the discharge pipe.
[0012] In some embodiments, the injection molding machine includes a driving device, a barrel is fixedly connected to one side surface of the driving device, a lower silo is provided at the upper end of the barrel, a screw is provided inside the barrel, one end of the screw is fixedly connected to the output end of the driving device, a check valve is fixedly connected to the other end of the screw, a heating element is fixedly connected to the outside of the barrel, six heating elements are provided and distributed in a linear array, and the six heating elements are interconnected.
[0013] In some embodiments, a guide column is fixedly connected to one side surface of the upper mold, and a guide groove is opened on one side surface of the lower mold. The guide column and the guide groove are arranged in the same position and quantity, and the guide column and the guide groove are adapted to each other.
[0014] In some embodiments, a demoulding rod is fixedly connected to one side surface of the lower mold, and a traction plate is fixedly connected to one side surface of the lower mold, and two traction plates are provided and symmetrically distributed.
[0015] The present invention has at least the following beneficial effects: 1. The present invention uses an electric push rod to push the moving frame and the front end as a whole, uses a limiting ring to limit the connecting column, realizes the synchronous movement of the rotating plate and the tripod, and uses a sliding groove to limit the cutting piece, so that the cutting piece can cut off the solidified molten plastic in the vertical direction to prevent adhesion when taking the material. The automated cutting process reduces the time and labor cost of manual operation, reduces subsequent processing procedures, and reduces the product defect rate.
[0016] 2. The present invention heats the discharge pipe by the electric heating wire inside the external sleeve, so that the solidified molten plastic whose discharge port has been cut off is reheated to make it reach a molten state again, thereby improving the fluidity of the plastic, which helps the plastic to flow more evenly in the mold, reduces the flow resistance caused by condensation, ensures that the injection molded parts can be formed completely and clearly, avoids appearance defects such as ripples and cold material spots caused by condensation, improves the surface quality of the injection molded parts, and can better fill the mold to form a dense injection molded part structure, thereby improving the structural strength and durability of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention from a front viewing angle; Figure 2 It is a schematic diagram of the three-dimensional structure of the rear view angle of the present invention; Figure 3 It is a schematic cross-sectional view of the three-dimensional structure of the present invention from an upward viewing angle; Figure 4 It is a schematic diagram of the three-dimensional structure of some components of the present invention; Figure 5 It is a first internal schematic diagram of the three-dimensional structure of some components of the present invention; Figure 6 It is a second internal schematic diagram of the three-dimensional structure of some components of the present invention; Figure 7 It is a schematic diagram of the exploded three-dimensional structure of some components of the present invention; Figure 8 This is a first schematic diagram of the three-dimensional structure of some components of the present invention; Fig. 9 This is a second schematic diagram of the split three-dimensional structure of some components of the present invention.
[0018] In the figure: 1. injection molding machine; 2. injection mold; 3. upper mold; 4. lower mold; 5. lower bin; 6. driving device; 7. screw; 8. check valve; 9. barrel; 10. connector; 11. discharge assembly; 12. electric push rod; 13. discharge pipe; 14. external sleeve; 15. reflux ball; 16. moving frame; 17. rotating plate; 18. tripod; 19. cut-off piece; 20. connecting column; 21. limit ring; 22. baffle; 23. sliding groove; 24. heating wire; 25. fitting groove; 26. discharge head; 27. discharge port; 28. connecting block; 29. guide column; 30. guide groove; 31. demoulding rod; 32. traction plate; 33. heating element. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0020] This application provides a technical solution: See attached Figure 1-Figure 9 As shown, an ear canal injection molding process for earphones includes the following steps: S1: preheating stage: the barrel 9 is heated to a set temperature, and the plastic particles melt into a molten state inside the barrel 9; S2: Injection stage: The screw 7 injects the molten plastic into the mold cavity, and the vacuum device is started at the same time to reduce the generation of bubbles and ensure that the plastic fully fills the mold cavity; S3: Holding pressure stage: Maintain injection pressure to ensure uniform distribution of plastic in the mold cavity and prevent shrinkage; S4: Cooling stage: The cooling water circuit and cooling fan are started to quickly cool the mold, so that the product can be quickly solidified and the production efficiency can be improved; S5: Demolding stage: the mold is opened and the molded product is taken out, completing the entire injection molding process.
[0021] On the other hand, the embodiment of the present application further provides an ear canal injection molding device for an earphone, comprising an injection molding machine 1 and an injection mold 2, the injection mold 2 comprising an upper mold 3 and a lower mold 4, a connection block 28 is fixedly connected to one side surface of the upper mold 3, a discharge assembly 11 is fixedly connected to the middle of the connection block 28, a connector 10 is fixedly connected to one side surface of the discharge assembly 11, and the connector 10 is mainly used to facilitate the injection molding machine 1 to perform injection molding on the inside of the injection mold 2; The discharge assembly 11 includes a discharge pipe 13, which is provided with two sections, one of which is fixedly connected to the outside of an external sleeve 14, and a reflux ball 15 is fixedly connected between the two sections of the discharge pipe 13. The reflux ball 15 has certain expansibility and contraction, and is made of high-temperature resistant material. It is mainly used to prevent air injection and pressure imbalance when the solidified plastic particles at the front end are melted into a molten state again. When the solidified plastic particles at the front end are melted into a molten state again, the overall volume occupied will be reduced, and air is likely to exist at this position, so that a large amount of air is easily injected into it during the next injection molding process, resulting in the generation of bubbles. At this time, the elasticity of the reflux ball 15 itself is used to shrink and squeeze the plastic fluid in a molten state stored inside, and the empty position at the front end is supplemented, so as to expel the air at the front end caused by reshaping, so that the front end is more full as a whole during the next injection molding process.
[0022] The interior of the connecting block 28 is fixedly connected with an electric push rod 12, and the connecting block 28 is made of high-temperature resistant material. The electric push rod 12 is arranged on the inner side of the connecting block 28, which can be effectively insulated. At the same time, the line connection of the electric push rod 12 is hidden inside the connecting block 28, and finally exposed from the rear end of the connecting block 28, which is used to connect with an external controller so that it can be effectively controlled and used. The output end of the electric push rod 12 is fixedly connected with a moving frame 16, and the lower ends of both sides of the moving frame 16 are movably connected with a rotating plate 17. Two rotating plates 17 are provided on one side of the moving frame 16 and are symmetrically distributed, and the moving directions of the two rotating plates 17 are opposite. The electric push rod 12 is mainly used to control the front moving frame 16 and the whole connected to the moving frame 16 to move forward and retract backward.
[0023] One end of the rotating plate 17 is movably connected to a tripod 18, and one end of the tripod 18 is provided with a connecting column 20. The rotating plate 17 and the tripod 18 are movably connected by the cooperation between the notch at one end of the rotating plate 17 and the connecting column 20. The tripod 18 itself has a certain stability, and the tripod 18 itself can only move up and down, and has no other movement mode.
[0024] A truncation piece 19 is fixedly connected to one side surface of the tripod 18, and two branch angles of the tripod 18 are respectively fixed at the upper and lower ends of the truncation piece 19. There are two truncation pieces 19 in total and they are symmetrically distributed. When the tripod 18 drives the two truncation pieces 19 to approach each other, it is beneficial to cut off the solidified plastic particles at the front end of the external sleeve 14 and the discharge port 27, so as to facilitate their re-melting inside the external sleeve 14. After the injection molding is completed, the overall device will start the cooling water circuit and the cooling fan to quickly cool the mold and make the product solidify quickly. After the product is solidified, the electric push rod 12 fixedly connected inside the connecting block 28 is used to work, so that the moving frame 16 and the front end of the electric push rod 12 are moved as a whole, and the connecting column 20 is limited by the limiting ring 21 to realize the synchronous movement of the rotating plate 17 and the tripod 18. The sliding groove 23 is used to limit the cutting piece 19, so that the cutting piece 19 can cut off the solidified molten plastic in the vertical direction to prevent adhesion when taking the material. After cutting, the electric heating wire 24 inside the external sleeve 14 is used to heat the discharge pipe 13, so that the solidified molten plastic that has been cut off at the discharge position is reheated and reaches a molten state again, thereby improving the fluidity of the plastic, which helps the plastic to flow more evenly in the mold and reduce the flow resistance caused by condensation. After the internal material reaches the molten state, the electric push rod 12 is used to work, and the reverse movement is used to drive the front end to achieve the reset operation. At the same time, the edge of the external sleeve 14 can scrape the side of the cutting piece 19 to reduce adhesion. When the cutting piece 19 is opened, the injection molding equipment at the rear end is used for the next injection molding.
[0025] A baffle plate 22 is fixedly connected to one side surface of the connecting block 28, and a sliding groove 23 is opened on one side surface of the baffle plate 22. Both ends of the truncated piece 19 are snap-fitted into the inside of the sliding groove 23, and the truncated piece 19 slides and moves inside the sliding groove 23. Limiting rings 21 are fixedly connected to both sides of the position where the connecting block 28 is located. The inner side of the limiting ring 21 is adapted to one end of the connecting column 20, and one end of the connecting column 20 is movably snap-fitted into the inner side of the limiting ring 21. The limiting ring 21 limits the movable position of the tripod 18, and the sliding groove 23 limits the movable position of the truncated piece 19.
[0026] A heating wire 24 is fixedly connected to the inner side of the external sleeve 14, and a fitting groove 25 is provided on the outer surface of a section of the discharge pipe 13 on the inner side of the external sleeve 14. The fitting groove 25 provided on the outer side of the discharge pipe 13 is adapted to the heating wire 24, and the two can fit tightly together. The line connection of the heating wire 24 is hidden inside the connecting block 28, and finally exposed from the rear end of the connecting block 28, and is used to connect with an external controller so that it can be effectively controlled and used. The connecting block 28 can play a certain protective role on the line connection of the heating wire 24. When the heating wire 24 is working, the solidified plastic particles at the front end of the discharge port 27 can be re-melted, which is convenient for the next injection molding and use of the injection mold 2, and prevents blockage and excessive internal pressure.
[0027] A discharge head 26 is fixedly connected to the surface of one side of the discharge pipe 13. The front end of the discharge head 26 is arranged in a stepped shape. A discharge port 27 is provided on the outer side of the discharge head 26. There are three discharge ports 27 facing three different directions. The three discharge ports 27 are interconnected with the inside of the discharge pipe 13. There are three discharge directions, which can effectively buffer the pressure at the discharge end and reduce the generation of bubbles.
[0028] The injection molding machine 1 includes a driving device 6, a barrel 9 is fixedly connected to one side surface of the driving device 6, a lower bin 5 is arranged at the upper end of the barrel 9, a screw 7 is arranged inside the barrel 9, one end of the screw 7 is fixedly connected to the output end of the driving device 6, and the other end of the screw 7 is fixedly connected to a check valve 8. A heating element 33 is fixedly connected to the outer side of the barrel 9. Six heating elements 33 are arranged and distributed in a linear array, and the six heating elements 33 are interconnected. The barrel 9 and the heating element 33 are used to heat and melt plastic particles, the screw 7 is used to convey and mix molten plastic, and the check valve 8 is used to play a check role after the molten plastic is injected into the mold cavity. When the injection molding machine 1 starts to feed, the valve is opened under pressure to allow the molten plastic material to flow smoothly to the mold. During the injection molding process or after the injection molding is completed, if the material tries to flow back, the pressure of the valve will change, and this pressure change will prompt the check valve 8 to close quickly. Thereby effectively preventing the backflow of materials, and the check valve 8 is the prior art, the present invention will not describe it in detail, and the drawings will not show it in detail. The driving device 6 is used to control the rotation and advance and retreat of the screw 7. In the injection molding machine 1, the rotation of the screw 7 is usually powered by a hydraulic motor or an electric motor inside the driving device 6. These motors are connected to the threaded rod through components such as gears or belts to transmit power to the screw 7. At the same time, the advance and retreat of the screw 7 is powered by the injection cylinder. During the rotation and advancement of the screw 7, the material is gradually plasticized and melted under the shearing and friction of the screw 7. When the check valve 8 at the front end of the screw 7 advances to the front end of the barrel 9, the molten material is injected into the mold cavity. After the injection is completed, the screw 7 will stop advancing and remain in a certain position to carry out the next plasticization and injection process. The driving device 6 is a general term for the control end of the screw 7, which are all prior art, the present invention will not describe it in detail, and the drawings will not show it in detail.
[0029] A guide post 29 is fixedly connected to one side surface of the upper mold 3, and a guide groove 30 is provided on one side surface of the lower mold 4. The guide post 29 and the guide groove 30 are arranged in the same position and quantity, and the guide post 29 and the guide groove 30 are adapted to each other.
[0030] A demoulding rod 31 is fixedly connected to the surface of one side of the lower mold 4. The demoulding rod 31 is usually located at the bottom end of the mold. The product is ejected from the mold cavity by the push of the ejection mechanism. The demoulding rod 31 is a prior art, and the present invention will not describe it in detail, and the drawings will not show it in detail. A traction plate 32 is fixedly connected to the surface of one side of the lower mold 4. Two traction plates 32 are provided and are symmetrically distributed. The traction plates 32 are located at the bottom of the mold and work together with the demoulding rod 31 to help the plastic product to be smoothly ejected from the mold. The traction plate 32 is connected to the fixed part of the mold to ensure that it maintains a stable position during the injection molding process.
[0031] The use of this device is specifically divided into five steps. The first is the preheating stage. The barrel 9 is used to heat to the set temperature, and the plastic particles are melted into a molten state in the barrel 9. Then, the screw 7 is used to inject the molten plastic into the mold cavity, and the vacuum device is started at the same time. The vacuum device creates a low-pressure environment in the mold cavity to generate negative pressure, so that gas and air are extracted, thereby reducing the formation of bubbles, improving the quality and surface effect of the product, ensuring that the plastic fully fills the mold cavity, and maintaining the injection pressure at the same time to ensure the uniform distribution of the plastic in the mold cavity to prevent shrinkage. The specific model of the vacuum device can be BSV65, BSV100B, BSV65B, etc. The vacuum device is a prior art, and the present invention will not be described in detail, and the drawings will not be shown in detail. After the injection molding is completed, the cooling water circuit and the cooling fan are started to quickly cool the mold, so that the product is quickly solidified and the production efficiency is improved. After solidification, the mold is opened and the molded product is taken out to complete the entire injection molding process.
[0032] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.
Claims
1. An ear canal injection molding process for earphones, comprising the following steps: S1: preheating stage: the barrel (9) is heated to a set temperature, and the plastic particles are melted into a molten state in the barrel (9); S2: Injection stage: The screw (7) injects the molten plastic into the mold cavity, and the vacuum device is activated to reduce bubble generation and ensure that the plastic fully fills the mold cavity; S3: Holding pressure stage: Maintain injection pressure to ensure uniform distribution of plastic in the mold cavity and prevent shrinkage; S4: Cooling stage: The cooling water circuit and cooling fan are started to quickly cool the mold, so that the product can be quickly solidified and the production efficiency can be improved; S5: Demolding stage: the mold is opened and the molded product is taken out, completing the entire injection molding process.
2. An ear canal injection molding device for earphones, applied to the ear canal injection molding process for earphones according to claim 1, comprising an injection molding machine (1) and an injection mold (2), characterized in that: The injection mold (2) comprises an upper mold (3) and a lower mold (4); a connection block (28) is fixedly connected to one side surface of the upper mold (3); a discharge assembly (11) is fixedly connected to the middle of the connection block (28); and a connector (10) is fixedly connected to one side surface of the discharge assembly (11); The discharge assembly (11) comprises a discharge pipe (13), wherein the discharge pipe (13) is provided with two sections, wherein an external sleeve (14) is fixedly connected to the outside of one section of the discharge pipe (13), and a reflux ball (15) is fixedly connected between the two sections of the discharge pipe (13).
3. The ear canal injection molding device for earphones according to claim 2, characterized in that: The interior of the connecting block (28) is fixedly connected to an electric push rod (12), the output end of the electric push rod (12) is fixedly connected to a moving frame (16), the lower ends of both sides of the moving frame (16) are movably connected to rotating plates (17), two rotating plates (17) are provided on one side of the moving frame (16) and are symmetrically distributed, and the moving directions of the two rotating plates (17) are opposite.
4. The ear canal injection molding device for earphones according to claim 3, characterized in that: One end of the rotating plate (17) is movably connected to a tripod (18), one end of the tripod (18) is provided with a connecting column (20), and the rotating plate (17) and the tripod (18) are movably connected by cooperation between a notch at one end of the rotating plate (17) and the connecting column (20).
5. The ear canal injection molding device for earphones according to claim 4, characterized in that: A truncation piece (19) is fixedly connected to one side surface of the tripod (18); two branch angles of the tripod (18) are respectively fixed to the upper and lower ends of the truncation piece (19); a total of two truncation pieces (19) are provided and are symmetrically distributed.
6. The ear canal injection molding device for earphones according to claim 5, characterized in that: A baffle (22) is fixedly connected to one side surface of the connection block (28), a sliding groove (23) is provided on one side surface of the baffle (22), two ends of the cut-off piece (19) are snap-fitted into the inside of the sliding groove (23), and the cut-off piece (19) slides and moves inside the sliding groove (23), and both sides of the position where the connection block (28) is located are fixedly connected to limit rings (21), the inner side of the limit ring (21) is mutually adapted with one end of the connection column (20), and one end of the connection column (20) is movably snap-fitted into the inner side of the limit ring (21).
7. The ear canal injection molding device for earphones according to claim 6, characterized in that: The inner side of the external sleeve (14) is fixedly connected with an electric heating wire (24), and a fitting groove (25) is provided on the outer surface of a section of the discharge pipe (13) inside the external sleeve (14). The fitting groove (25) provided on the outer side of the discharge pipe (13) and the electric heating wire (24) are adapted to each other and can be tightly meshed together.
8. The ear canal injection molding device for earphones according to claim 7, characterized in that: A discharge head (26) is fixedly connected to a surface of one side of the discharge pipe (13), the front end of the discharge head (26) is arranged in a stepped shape, a discharge port (27) is provided on the outer side of the discharge head (26), three discharge ports (27) are provided and face three different directions, and the three discharge ports (27) are in communication with the interior of the discharge pipe (13).
9. The ear canal injection molding device for earphones according to claim 8, characterized in that: The injection molding machine (1) comprises a driving device (6), a barrel (9) is fixedly connected to a surface of one side of the driving device (6), a lower bin (5) is arranged at the upper end of the barrel (9), a screw (7) is arranged inside the barrel (9), one end of the screw (7) is fixedly connected to an output end of the driving device (6), and the other end of the screw (7) is fixedly connected to a check valve (8), and a heating element (33) is fixedly connected to the outer side of the barrel (9), six heating elements (33) are arranged and distributed in a linear array, and the six heating elements (33) are interconnected.
10. The ear canal injection molding device for earphones according to claim 9, characterized in that: A guide column (29) is fixedly connected to one side surface of the upper mold (3), and a guide groove (30) is provided on one side surface of the lower mold (4); the guide column (29) and the guide groove (30) are arranged in the same position and in the same number, and the guide column (29) and the guide groove (30) are adapted to each other; A demoulding rod (31) is fixedly connected to one side surface of the lower mold (4), and a traction plate (32) is fixedly connected to one side surface of the lower mold (4), wherein two traction plates (32) are provided and are symmetrically distributed.