Ear cap injection molding module and ear cap injection molding method

Abstract

This invention belongs to the field of injection molding technology and discloses an ear cap injection molding module and an ear cap injection molding method. The ear cap injection molding module includes a first upper mold, a second upper mold, and a third upper mold, as well as a support base, a middle plate, and a molding assembly. When the first upper mold is closed to the support base, the first upper mold and the support base form a first mold cavity, which is used to mold a hard silicone base. The middle plate is connected to the support base, and when the second upper mold is closed to the middle plate, the second upper mold and the middle plate form a second mold cavity on the hard silicone base. The molding assembly is fitted onto a liquid silicone umbrella cap on the support base, and when the third upper mold is closed to the molding assembly, the molding assembly and the liquid silicone umbrella cap form a third mold cavity on the hard silicone base, and the third mold cavity is located within the support space of the liquid silicone umbrella cap. This ear cap injection molding module can effectively avoid deformation and damage to the foamed silicone connection part caused by high injection pressure, thereby improving the product's aesthetics and yield.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and in particular to an ear cap injection molding module and an ear cap injection molding method. Background Technology

[0002] With the rapid development of technology, Bluetooth headphones are becoming increasingly popular, widely used in daily life due to their advantages such as wireless transmission and portability. To improve the comfort of Bluetooth headphones when worn, the in-ear part of the headphones is usually equipped with a silicone injection-molded one-piece ear tip. The ear tip includes a base that connects to the headphones, an in-ear part that inserts into the ear, and a connecting part that connects the base and the in-ear part. In addition to improving the user's wearing comfort, the ear tip can also reduce noise to enhance the sound quality experience.

[0003] The base, connector, and earpiece of the existing ear cap are made of different materials, which requires multiple injection molding steps. To achieve the above injection molding process, three molds are needed for one-shot, two-shot, and three-shot injection molding respectively. The specific sequence is to first mold the base (hard silicone), then mold the connector (foamed silicone), and finally mold the earpiece (liquid silicone). However, when the earpiece is molded in three-shot molding in the existing molding process, the liquid silicone is injected at a high pressure, which can easily cause the microspheres inside the foamed silicone in the two-shot molding to rupture, resulting in product extrusion deformation, reducing the aesthetics of the ear cap and the product yield. Summary of the Invention

[0004] The purpose of this invention is to provide several embodiments of an ear cap injection molding module and an ear cap injection molding method, wherein at least one embodiment can effectively avoid the deformation and damage of the foamed silicone connection part caused by high injection pressure, so as to improve the aesthetics and yield of the product.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] The ear cap injection molding module includes a first upper mold, a second upper mold, and a third upper mold arranged sequentially in the injection molding sequence, and also includes:

[0007] When the first upper mold is closed on the support base, the first upper mold and the support base surround to form a first mold cavity, which is used to form a hard silicone base.

[0008] The middle plate is connected to the supporting base, and when the second upper mold is closed on the middle plate, the second upper mold and the middle plate surround the hard silicone base to form a second mold cavity, which is used to form a liquid silicone umbrella cap;

[0009] A molding component is fitted onto the liquid silicone umbrella cap on the support base. When the third upper mold is closed onto the molding component, the molding component and the liquid silicone umbrella cap surround the hard silicone base to form a third mold cavity, and the third mold cavity is located in the support space of the liquid silicone umbrella cap. The third mold cavity is used to mold the foamed silicone connecting part.

[0010] Preferably, the molding component includes two molding plates, each molding plate having a mounting half-hole. When the two molding plates are aligned and joined together, the two mounting half-holes form a mounting hole, through which the molding component is fitted onto the liquid silicone umbrella cap.

[0011] Preferably, the molding plate includes a plate body and a molding part connected to each other. When the plate body is laid on the support base, the molding part extends into the support space of the liquid silicone umbrella cap, and the molding part and the liquid silicone umbrella cap surround the hard silicone base to form a third mold cavity.

[0012] Preferably, at least one of the molding plates is provided with a glue injection channel, which is connected to the third mold cavity.

[0013] Preferably, the molding component further includes a positioning pin, and a positioning half-groove is provided on the molding plate. When the two molding plates are configured to be joined together facing each other, the two positioning half-grooves form a positioning groove, and the positioning pin is embedded in the positioning groove.

[0014] Preferably, the ear cap injection molding module further includes a fixed lower mold, which has a receiving groove for limiting and accommodating the support base.

[0015] The ear cap injection molding method, using the above-mentioned ear cap injection molding module, includes the following steps:

[0016] S1. The first upper mold is closed onto the support base, so that the first mold cavity is formed between the first upper mold and the support base, and the hard silicone base is formed by injection molding in the first mold cavity;

[0017] S2. Remove the first upper mold from the support base, leave the hard silicone base on the support base, and lay the middle plate on the support base.

[0018] S3. The second upper mold is closed onto the middle plate, so that the second upper mold and the middle plate surround the hard silicone base to form the second mold cavity, and the liquid silicone umbrella cap is formed by injection molding in the second mold cavity;

[0019] S4. Remove the second upper mold from the middle plate, remove the middle plate from the support base, leave the hard silicone base and the liquid silicone umbrella cap on the support base, lay the molding assembly on the support base, and let the liquid silicone umbrella cap protrude from the molding assembly.

[0020] S5. The third upper mold is closed onto the molding component, so that the molding component and the liquid silicone umbrella cap surround the hard silicone base to form the third mold cavity, and the foamed silicone connecting part is formed by injection molding in the third mold cavity.

[0021] Preferably, step S4, removing the middle plate from the support base, specifically includes:

[0022] Flip up the brim of the liquid silicone umbrella cap;

[0023] Remove the middle plate from the support base in a direction away from the support base.

[0024] Preferably, step S4, which involves laying the molding component on the support base, specifically includes:

[0025] Flip up the brim of the liquid silicone umbrella cap;

[0026] The molding assembly is split into two molding plates, which are then abutted against the liquid silicone umbrella cap from both sides.

[0027] Preferably, after the two molding plates abut against the liquid silicone umbrella cap from both sides, the system further includes:

[0028] Flip down the edge of the liquid silicone umbrella cap so that the edge abuts against the molding plate.

[0029] The beneficial effects of this invention are as follows:

[0030] The ear cap injection molding module provided by this invention includes a first upper mold, a second upper mold, a third upper mold, a support base, a molding plate, and a middle plate assembly. The first upper mold, the second upper mold, and the third upper mold are arranged sequentially along the injection molding sequence. Along the injection molding sequence, a first cavity for molding a hard silicone base is formed between the first upper mold and the support base; a second cavity for molding a liquid silicone umbrella cap is formed on the hard silicone base by the second upper mold and the middle plate; and a third cavity for molding a foamed silicone connector is formed on the hard silicone base by the liquid silicone umbrella cap and the molding assembly. Therefore, this ear cap injection molding module can form a complete ear cap through three injection molding processes. Since the second upper mold is located before the third upper mold along the injection molding sequence, this ear cap injection molding module first injection molds the liquid silicone umbrella cap and then injection molds the foamed silicone connector, ensuring that the foamed silicone connector is formed last. This solves the problem of excessive pressure during liquid silicone injection causing deformation and damage to the foamed silicone material, thereby greatly improving product aesthetics and yield.

[0031] The ear cap injection molding method provided by this invention first injection molds a liquid silicone umbrella cap after injection molding a hard silicone base, and finally injection molds a foamed silicone connecting part. This effectively avoids the situation where excessive pressure during the molding of the liquid silicone umbrella cap causes deformation and damage to the foamed silicone connecting part, greatly improving the product's aesthetics and yield. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the ear cap injection molding module provided in a specific embodiment of the present invention;

[0033] Figure 2 This is a cross-sectional view of the support base when the injection-molded hard silicone base is provided in a specific embodiment of the present invention;

[0034] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0035] Figure 4 This is a cross-sectional view of the support base for injection molding liquid silicone umbrella caps provided in a specific embodiment of the present invention;

[0036] Figure 5 yes Figure 4 A magnified view of a section at point B in the middle;

[0037] Figure 6 This is a cross-sectional view of the support base when the injection-molded foamed silicone connector is provided in a specific embodiment of the present invention;

[0038] Figure 7 yes Figure 6 A magnified view of a section at point C;

[0039] Figure 8This is an exploded view of the molding component and the support base provided in a specific embodiment of the present invention;

[0040] Figure 9 yes Figure 8 A magnified view of a section at point D;

[0041] Figure 10 This is an exploded view of the liquid silicone umbrella cap provided in a specific embodiment of the present invention.

[0042] In the picture:

[0043] 100-Hard silicone base;

[0044] 200 - Liquid silicone umbrella cap; 210 - Cap brim; 220 - Support space;

[0045] 300-Foamed silicone connector;

[0046] 1-First upper mold;

[0047] 2-Second upper mold;

[0048] 3-Third upper mold;

[0049] 4-Supporting base;

[0050] 5-Medium plate;

[0051] 6- Molding component; 61- Molding plate; 611- Plate body; 612- Molding part; 613- Injection channel; 62- Positioning pin;

[0052] 7-First fixed lower mold;

[0053] 8-Second fixed lower mold;

[0054] 9-Third fixed lower mold. Detailed Implementation

[0055] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0056] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0058] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0059] like Figures 1 to 7 , Figure 10As shown, the present invention provides an ear cap injection molding module, which includes a first upper mold 1, a second upper mold 2, and a third upper mold 3 arranged sequentially in the injection molding sequence, and also includes a support base 4, a middle plate 5, and a molding assembly 6. When the first upper mold 1 is closed to the support base 4, the first upper mold 1 and the support base 4 form a first mold cavity, which is used to mold a hard silicone base 100; the middle plate 5 is connected to the support base 4, and when the second upper mold 2 is closed to the middle plate 5, the second upper mold 2 and the support base 4 form a first mold cavity. The middle plate 5 surrounds the hard silicone base 100 to form a second mold cavity, which is used to form the liquid silicone umbrella cap 200. The molding component 6 is sleeved on the support base 4 to form the liquid silicone umbrella cap 200. When the third upper mold 3 is closed on the molding component 6, the molding component 6 and the liquid silicone umbrella cap 200 surround the hard silicone base 100 to form a third mold cavity. The third mold cavity is located in the support space 220 of the liquid silicone umbrella cap 200. The third mold cavity is used to form the foamed silicone connecting part 300. Specifically, along the injection molding sequence, a first mold cavity for molding the hard silicone base 100 is formed between the first upper mold 1 and the supporting base 4; a second mold cavity for molding the liquid silicone umbrella cap 200 is formed on the hard silicone base 100 by the second upper mold 2 and the middle plate 5; and a third mold cavity for molding the foamed silicone connecting part 300 is formed on the hard silicone base 100 by the liquid silicone umbrella cap 200 and the molding component 6. Therefore, the ear cap injection molding module can form a complete ear cap through three injection molding processes. Since the second upper mold 2 is located before the third upper mold 3 along the injection molding sequence, the ear cap injection molding module first injection molds the liquid silicone umbrella cap 200 and then injection molds the foamed silicone connecting part 300, so that the foamed silicone connecting part 300 is formed last. This solves the problem of deformation and damage to the foamed silicone material caused by excessive pressure during the later injection of liquid silicone, thereby greatly improving the product's aesthetics and yield.

[0060] In this embodiment, the ear cap formed by the injection molding module includes three connected parts: a hard silicone base 100, a liquid silicone umbrella cap 200, and a foamed silicone connecting part 300. The hard silicone base 100 is used to connect with the earphone body and has a sound outlet that communicates with the sound hole of the earphone body. The liquid silicone umbrella cap 200 is used to insert into the ear canal to ensure that the earphone can be fixed in the ear. The liquid silicone umbrella cap 200 includes connected cap posts. The cap brim 210 and the cap post are connected to the hard silicone base 100. The cap post has a sound guiding channel, which is set directly opposite the sound outlet of the hard silicone base 100. The cap brim 210 is connected to the end of the cap post and opens outwards to form an umbrella-shaped structure. A support space 220 is formed between the cap brim 210 and the cap post. The foamed silicone connecting part 300 is set in the support space 220 and surrounds the cap post. The bottom end of the foamed silicone connecting part 300 is connected to the hard silicone base 100.

[0061] like Figure 1 , Figure 4 as well as Figure 5 As shown, the middle plate 5 has a through hole, and the middle plate 5 is fitted onto the hard silicone base 100 through the through hole.

[0062] Specifically, such as Figure 8 and Figure 9 As shown, the molding component 6 includes two molding plates 61, each with a mounting half-hole. When the two molding plates 61 are aligned and joined together, the two mounting half-holes form a mounting hole, through which the molding component 6 is fitted onto the liquid silicone umbrella cap 200. When using the third upper mold 3 to inject the liquid silicone umbrella cap 200, the two molding plates 61 need to be joined together from both sides of the liquid silicone umbrella cap 200. After joining, the liquid silicone umbrella cap 200 will extend out from the mounting hole, and the molding plates 61 can support and fix the liquid silicone umbrella cap 200 from the bottom side.

[0063] In this embodiment, as Figures 6 to 10 As shown, the molding plate 61 includes a plate body 611 and a molding part 612 connected to each other. When the plate body 611 is laid on the support base 4, the molding part 612 extends into the support space 220 of the liquid silicone umbrella cap 200, and the molding part 612 and the liquid silicone umbrella cap 200 surround the hard silicone base 100 to form a third mold cavity. Specifically, the plate body 611 is a flat plate structure with an installation half groove. The molding part 612 protrudes from the plate body 611 and has a receiving half groove. The receiving half groove and the installation half groove teeth vertically form an installation half hole. The shape of the molding part 612 matches the shape of the liquid silicone umbrella cap 200. When the two molding plates 61 are aligned and spliced, the two molding parts 612 form a complete arc-shaped protrusion structure. This structure extends into the support space 220 of the liquid silicone umbrella cap 200 and forms a third mold cavity between it and the inner wall of the support space 220.

[0064] like Figures 6 to 9 As shown, at least one molding plate 61 is provided with an injection channel 613, which communicates with the third mold cavity. When two molding plates 61 are aligned and joined together, the operator injects material into the third mold cavity through the injection channel 613 to form the foamed silicone connector 300. In this embodiment, one of the molding plates 61 is provided with an injection channel 613, so the operator can inject material through one molding plate 61 during injection molding.

[0065] The ear cap injection molding module also includes a fixed lower mold, which has a receiving groove for limiting and accommodating the support base 4. In this embodiment, the fixed lower mold includes a first fixed lower mold 7, a second fixed lower mold 8, and a third fixed lower mold 9. Each of the three fixed lower molds is provided with a receiving groove. When different injection molding steps are performed, the support base 4 is transferred to the receiving groove of the different fixed lower molds to cooperate with the different upper molds for injection molding operations.

[0066] In this embodiment, after the support base 4 is placed into the receiving groove, the two ends of the support base 4 along the width direction are close to the side wall of the receiving groove, and the two ends of the support base 4 along the length direction extend out of the receiving groove, thereby facilitating the removal and placement of the support base 4.

[0067] Furthermore, such as Figure 1 , Figure 8 as well as Figure 9 As shown, the molding assembly 6 also includes a positioning pin 62. A positioning half-groove is provided on the molding plate 61. When the two molding plates 61 are configured to be aligned and joined, the two positioning half-grooves form a positioning groove. The positioning pin 62 is embedded in the positioning groove, and the support base 4 also has a matching insertion hole for the positioning pin 62. The end of the positioning pin 62 can be inserted into the insertion hole of the support base 4. Therefore, the positioning pin 62 can limit the two molding plates 61 along their length. It can be understood that the positioning pin 62, in conjunction with the receiving groove, fixes the molding plate 61 to prevent it from moving during injection molding and reducing the molding quality of the product.

[0068] This embodiment also provides an ear cap injection molding method, which uses the aforementioned ear cap injection molding module, such as... Figures 1 to 7 As shown, it includes the following steps:

[0069] S1. The first upper mold 1 is closed onto the support base 4, forming a first mold cavity between the first upper mold 1 and the support base 4. A hard silicone base 100 is injection molded into the first mold cavity. S2. The first upper mold 1 is removed from the support base 4, leaving the hard silicone base 100 on the support base 4. The middle plate 5 is then placed on the support base 4. S3. The second upper mold 2 is closed onto the middle plate 5, forming a second mold cavity around the hard silicone base 100. A liquid silicone umbrella cap is injection molded into the second mold cavity. 200; S4, Remove the second upper mold 2 from the middle plate 5, remove the middle plate 5 from the support base 4, leave the hard silicone base 100 and the liquid silicone umbrella cap 200 on the support base 4, lay the molding component 6 on the support base 4, and let the liquid silicone umbrella cap 200 pass through the molding component 6; S5, Close the third upper mold 3 onto the molding component 6, so that the molding component 6 and the liquid silicone umbrella cap 200 surround the hard silicone base 100 to form a third mold cavity, and inject the foamed silicone connecting part 300 into the third mold cavity.

[0070] Specifically, after injection molding the hard silicone base 100, the liquid silicone umbrella cap 200 is first injection molded, and finally the foamed silicone connector 300 is injection molded. This effectively avoids the situation where the foamed silicone connector 300 is deformed and damaged due to excessive pressure when molding the liquid silicone umbrella cap 200, and greatly improves the product's aesthetics and yield.

[0071] In this embodiment, a first fixed lower mold 7, a second fixed lower mold 8, and a third fixed lower mold 9 are respectively provided for the first upper mold 1, the second upper mold 2, and the third upper mold 3. Each of the three fixed lower molds is provided with a receiving groove. When the hard silicone base 100 is injection molded, the support base 4 is placed in the receiving groove of the first fixed lower mold 7 and fixed. When the liquid silicone umbrella cap 200 is injection molded, the support base 4 with the hard silicone base 100 is removed from the first fixed lower mold 7 and placed in the receiving groove of the second fixed lower mold 8 and fixed. The middle plate 5 is then laid on the support base 4. When the foamed silicone connecting part 300 is injection molded, the middle plate 5 is removed from the support base 4, and the support base 4 with the hard silicone base 100 and the liquid silicone umbrella cap 200 is placed in the receiving groove of the third fixed lower mold 9 and fixed. The molding component 6 is then laid on the support base 4.

[0072] like Figure 1 , Figure 4 as well as Figure 5 As shown, in this embodiment, step S4, removing the middle plate 5 from the support base 4, specifically includes: flipping up the edge 210 of the liquid silicone umbrella cap 200; and removing the middle plate 5 from the support base 4 in a direction away from the support base 4. Specifically, after the liquid silicone umbrella cap 200 is injection molded using the second upper mold 2 and the middle plate 5, the edge 210 of the liquid silicone umbrella cap 200 is flipped down in an umbrella shape and rests against the middle plate 5. Therefore, before removing the middle plate 5, the operator needs to manually flip up the edge 210 of the liquid silicone umbrella cap 200. At this time, the through hole of the middle plate 5 can pass through the hard silicone base 100 and the liquid silicone umbrella cap 200 to remove it from the support base 4.

[0073] like Figures 6 to 9 As shown, step S4, which involves laying the molding component 6 on the support base 4, specifically includes: flipping up the edge 210 of the liquid silicone umbrella cap 200; disassembling the molding component 6 into two molding plates 61, which are then placed against the liquid silicone umbrella cap 200 from both sides; and joining the two molding plates 61 together from both sides of the liquid silicone umbrella cap 200. After joining, the liquid silicone umbrella cap 200 will protrude from the mounting hole, greatly reducing the installation difficulty of the molding component 6 and making it easier to operate.

[0074] The molding plate 61 includes a plate body 611 and a molding part 612. The molding part 612 is used to surround the liquid silicone umbrella cap 200 to form a third mold cavity. In order to better assemble the molding part 612, before assembling the two molding plates 61, the operator needs to manually flip up the cap edge 210 of the liquid silicone umbrella cap 200, or keep the cap edge 210 in the flipped-up state when the middle plate 5 was removed.

[0075] It is understandable that after the two molding plates 61 abut against the liquid silicone umbrella cap 200 from both sides, the process also includes: flipping down the cap edge 210 of the liquid silicone umbrella cap 200 so that the cap edge 210 abuts against the molding plate 61, thereby forming a third mold cavity.

[0076] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An ear cap injection molding module, characterized in that, Including the first upper mold, the second upper mold, and the third upper mold arranged sequentially in the injection molding sequence, and also including: When the first upper mold is closed on the support base, the first upper mold and the support base surround to form a first mold cavity, which is used to form a hard silicone base. The middle plate is connected to the supporting base, and when the second upper mold is closed on the middle plate, the second upper mold and the middle plate surround the hard silicone base to form a second mold cavity, which is used to form a liquid silicone umbrella cap; A molding component is fitted onto the liquid silicone umbrella cap on the support base. When the third upper mold is closed onto the molding component, the molding component and the liquid silicone umbrella cap surround the hard silicone base to form a third mold cavity, and the third mold cavity is located in the support space of the liquid silicone umbrella cap. The third mold cavity is used to mold the foamed silicone connecting part.

2. The ear cap injection molding module according to claim 1, characterized in that, The molding component includes two molding plates, each with a mounting half-hole. When the two molding plates are aligned and joined together, the two mounting half-holes form a mounting hole, through which the molding component is fitted onto the liquid silicone umbrella cap.

3. The ear cap injection molding module according to claim 2, characterized in that, The molding plate includes a plate body and a molding part connected to each other. When the plate body is laid on the support base, the molding part extends into the support space of the liquid silicone umbrella cap, and the molding part and the liquid silicone umbrella cap surround the hard silicone base to form a third mold cavity.

4. The ear cap injection molding module according to claim 3, characterized in that, At least one of the molding plates is provided with a glue injection channel, which is connected to the third mold cavity.

5. The ear cap injection molding module according to claim 2, characterized in that, The molding component also includes a positioning pin. The molding plate has a positioning half-groove. When the two molding plates are configured to be joined together, the two positioning half-grooves form a positioning groove, and the positioning pin is embedded in the positioning groove.

6. The ear cap injection molding module according to claim 1, characterized in that, The ear cap injection molding assembly also includes a fixed lower mold, which has a receiving groove for limiting and accommodating the support base.

7. An injection molding method for ear caps, characterized in that, Using the ear cap injection molding module according to any one of claims 1-6 includes the following steps: S1. The first upper mold is closed onto the support base, so that the first mold cavity is formed between the first upper mold and the support base, and the hard silicone base is formed by injection molding in the first mold cavity; S2. Remove the first upper mold from the support base, leave the hard silicone base on the support base, and lay the middle plate on the support base. S3. The second upper mold is closed onto the middle plate, so that the second upper mold and the middle plate surround the hard silicone base to form the second mold cavity, and the liquid silicone umbrella cap is formed by injection molding in the second mold cavity; S4. Remove the second upper mold from the middle plate, remove the middle plate from the support base, leave the hard silicone base and the liquid silicone umbrella cap on the support base, lay the molding assembly on the support base, and let the liquid silicone umbrella cap protrude from the molding assembly. The third upper mold is closed onto the molding assembly, so that the molding assembly and the liquid silicone umbrella cap surround the hard silicone base to form the third mold cavity, and the foamed silicone connecting part is injection molded in the third mold cavity.

8. The ear cap injection molding method according to claim 7, characterized in that, Step S4, removing the middle plate from the support base, specifically includes: Flip up the brim of the liquid silicone umbrella cap; Remove the middle plate from the support base in a direction away from the support base.

9. The ear cap injection molding method according to claim 7, characterized in that, Step S4, which involves laying the molding component onto the support base, specifically includes: Flip up the brim of the liquid silicone umbrella cap; The molding assembly is split into two molding plates, which are then abutted against the liquid silicone umbrella cap from both sides.

10. The ear cap injection molding method according to claim 9, characterized in that, After the two molding plates abut against the liquid silicone umbrella cap from both sides, the system further includes: Flip down the edge of the liquid silicone umbrella cap so that the edge abuts against the molding plate.

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