Earphone headgear injection molding mechanism

Abstract

The present application relates to injection molding mechanism technical field, especially earphone headgear injection molding mechanism, including lower forming die and upper forming die, the lower forming die includes base and mold closing mechanism, the upper surface of the base is provided with lower forming groove corresponding to the main part of support, the lower surface of the base is provided with the clearance groove corresponding to the end of support, the base is provided with bending limiting part corresponding to support between lower forming groove and clearance groove, and is provided with mold closing part corresponding to mold closing mechanism;The mold closing mechanism abuts on mold closing part and bending limiting part, the clearance space is formed between the outer wall of mold closing mechanism, bending limiting part and clearance groove;The side of the mold closing mechanism away from the base is provided with driving mechanism, the mold closing mechanism is close to or away from the base under the action of driving mechanism;The upper forming die is provided with upper forming groove corresponding to lower forming groove, and is provided with pouring position corresponding to upper forming groove.The present application aims at realizing the fast and stable taking of the injection molding headgear.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to an injection molding mechanism for headphone headband components. Background Technology

[0002] Currently, upright headphones typically include an ear hook structure for supporting and connecting the headphone body. Some ear hook structures use two pre-bent metal parts as a supporting frame, and a connecting part is formed between the two metal parts through injection molding, connecting the two metal parts into one piece, thus obtaining an ear hook connection end with a certain structural strength and curved appearance. During injection molding, the two pre-bent metal parts need to be positioned and placed in the injection mold, and then the mold is closed and injection molded.

[0003] Because the ends of the aforementioned metal parts typically have inward or outward bending structures, these bent ends are prone to interference with the mold cavity, core, or other molding structures after injection molding, making it difficult for the ear-hook connection end to directly detach from the mold along the conventional mold opening direction. Therefore, existing molds usually require adjustments to the bending structure of the metal parts or the use of more complex demolding structures to avoid jamming between the metal parts and the mold during the material removal process.

[0004] However, simply changing the structure of the metal part to keep its ends vertical can reduce the difficulty of demolding, but it is difficult to meet the actual arc bending structure required for the ear hook connection end; while using a complex mold structure for demolding can easily lead to problems such as complex mold structure, inconvenient operation and reduced production efficiency. Summary of the Invention

[0005] The main objective of this invention is to provide an injection molding mechanism for headphone headband components, which aims to achieve rapid and stable unloading of the injection-molded headband components.

[0006] To achieve the above objectives, the present invention provides an injection molding mechanism for an earphone headband, used for injection molding a support member with bent and retracted ends, comprising a lower molding die and an upper molding die: The lower forming mold includes a base and a mold closing mechanism. The upper surface of the base is provided with a lower forming groove corresponding to the main body of the support member, and the lower surface of the base is provided with a clearance groove corresponding to the end of the support member. The base is provided with a bending limiting part corresponding to the support member between the lower forming groove and the clearance groove, and a mold closing part is provided corresponding to the mold closing mechanism. The mold closing mechanism abuts against the mold closing part and the bending limiting part. A clearance space is formed between the outer wall of the mold closing mechanism, the bending limiting part, and the clearance groove. A driving mechanism is provided on the side of the mold closing mechanism away from the base. The mold closing mechanism moves closer to or away from the base under the action of the driving mechanism. The upper forming mold is provided with an upper forming groove corresponding to the lower forming groove, and a casting position is provided corresponding to the upper forming groove.

[0007] In one embodiment of this application, the lower forming groove is provided with two mating grooves symmetrically corresponding to the two support members; The mating groove is provided with a mounting component for connecting with the support component; the mounting component extends through the base.

[0008] In one embodiment of this application, the bending limiting part is detachably connected to the base, and the bending limiting part is provided with a sealing connection part that cooperates with the mold closing mechanism on the main body of the support member. The bending limiting part is provided with a bending fixing part corresponding to the bending part of the support member located between the main body and the end.

[0009] In one embodiment of this application, the mold closing mechanism is provided with a first limiting member facing the clearance groove. When the mold closing mechanism abuts against the base, the first limiting member passes through the clearance groove and is connected to the support member.

[0010] In one embodiment of this application, the clearance groove is recessed at the end of the support member; The limiting groove, the first limiting member, and the corresponding support member of the clearance space form a stable space.

[0011] In one embodiment of this application, the lower molding die further includes a base, and the base, the mold closing mechanism, and the drive mechanism are all connected to the base; The base is provided with a second limiting member corresponding to the limiting groove. When the support member is fixed in the lower forming groove, the second limiting member is connected to the end of the support member.

[0012] In one embodiment of this application, the base is provided with a limiting groove corresponding to the second limiting member, one side of the second limiting member is slidably connected to the limiting groove, and the other side is slidably connected to the base; The base is equipped with a driving component corresponding to the second limiting member. When the upper forming mold, the lower forming mold, and the mold closing mechanism open with each other, the second limiting member, under the action of the driving component, causes the end of the support member to move away from the limiting groove.

[0013] In one embodiment of this application, the driving component includes: A connecting rod is connected to a second limiting member and passes through a base. The base is provided with a working groove corresponding to the moving path of the connecting rod. A driving component is connected to a connecting rod, and the connecting rod reciprocates within the working groove under the action of the driving component.

[0014] In one embodiment of this application, the base is symmetrically provided with two lower forming grooves, and two adjacent support members in the two lower forming grooves share a common clearance groove; The base and the upper forming mold are stably connected to each other through positioning grooves and positioning blocks.

[0015] In one embodiment of this application, a turntable is further included, wherein at least two mounting positions for mounting the lower forming mold are provided on the turntable, and the upper forming mold is provided with one mounting position.

[0016] As can be seen from the above, the headphone headband injection molding mechanism provided in this application initially limits the end of the support member by means of the clearance groove of the lower molding mold, and forms a sealing structure by means of the bending limiting part, which effectively avoids thermal deformation or mechanical interference of the support member during high temperature injection molding, thereby ensuring that the headphone headband can be smoothly demolded and removed, and has the above advantages. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the injection molding mechanism for the headphone headband of the present invention; Figure 2 This is a cross-sectional view of the injection molding mechanism for the headphone headband of the present invention; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the upper molding die structure of the headphone headband injection molding mechanism of the present invention; Figure 5 This is a schematic diagram of the base of the injection molding mechanism for the headphone headband of the present invention; Figure 6 This is a schematic diagram of the base of the injection molding mechanism for the headphone headband of the present invention; Figure 7 This is a schematic diagram of the support component of the injection molding mechanism for the headphone headband of the present invention.

[0019] Explanation of icon numbers: 1. Lower forming mold; 2. Base; 21. Lower forming groove; 22. Mating groove; 23. Mounting component; 24. Clearance groove; 25. Limiting groove; 26. Limiting slide; 3. Bending limiting part; 31. Sealing connection part; 32. Bending fixing part; 4. Mold closing mechanism; 41. First limiting component; 42. Clearance space; 5. Drive mechanism; 6. Base; 61. Working slide; 62. Drive assembly; 63. Connecting rod; 64. Drive component; 65. Second limiting component; 7. Positioning groove; 8. Upper forming mold; 9. Turntable; 10. Support component; 101. Main body; 102. Bending part; 103. End.

[0020] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0022] The following is in conjunction with the appendix Figures 1 to 7 The present invention will be further described below.

[0023] To achieve the above objectives, the present invention proposes an injection molding mechanism for an earphone headband, for a support member 10 for bending and retracting the injection molding end 103, comprising a lower molding die 1 and an upper molding die 8: The lower forming mold 1 includes a base 2 and a mold closing mechanism 4. The upper surface of the base 2 is provided with a lower forming groove 21 corresponding to the main body 101 of the support member 10. The lower surface of the base 2 is provided with a clearance groove 24 corresponding to the end 103 of the support member 10. The base 2 is provided with a bending limiting part 3 corresponding to the support member 10 between the lower forming groove 21 and the clearance groove 24, and is provided with a mold closing part corresponding to the mold closing mechanism 4. The mold closing mechanism 4 abuts against the mold closing part and the bending limiting part 3. A clearance space 42 is formed between the outer wall of the mold closing mechanism 4, the bending limiting part 3 and the clearance groove 24. A driving mechanism 5 is provided on the side of the mold closing mechanism 4 away from the base 2. The mold closing mechanism 4 moves closer to or away from the base 2 under the action of the driving mechanism 5. The upper forming mold 8 is provided with an upper forming groove corresponding to the lower forming groove 21, and a casting position is provided corresponding to the upper forming groove.

[0024] The headphone headband injection molding mechanism of this embodiment includes a lower molding mold 1 comprising a base 2 and a mold closing mechanism 4. The lower molding mold 1 can be machined from a single metal block, with the base 2 and mold closing mechanism 4 serving as different functional areas within it. The mold closing mechanism 4 can be designed as a slider structure driven by an internal hydraulic cylinder or pneumatic cylinder, moving on a guide rail inside the base 2. Alternatively, the lower molding mold 1 can adopt a modular design, with the base 2 as a main module and the mold closing mechanism 4 as an independent sub-module, fixed to the base 2 by bolts or pins and operated by an external drive device.

[0025] The upper surface of the base 2 is provided with a lower forming groove 21 corresponding to the main body 101 of the support member 10. The lower forming groove 21 can be designed as a semi-circular or rectangular groove that perfectly matches the shape of the main body 101 of the support member 10, and is formed on the base 2 by milling or electrical discharge machining. As another implementation, the lower forming groove 21 can be designed as a V-shaped groove with a certain inclination angle to facilitate the placement and positioning of the support member 10.

[0026] The lower surface of the base 2 is provided with a clearance groove 24 corresponding to the end 103 of the support member 10. The clearance groove 24 can be designed as an arc-shaped or L-shaped groove that matches the shape of the bent end 103 of the support member 10, and is formed on the lower surface of the base 2 by CNC machining. As another implementation, the clearance groove 24 can be designed as a rectangular through groove with a large size to provide sufficient movement space for the bent end 103 of the support member 10.

[0027] The base 2 has a bending limiting part 3 between the lower forming groove 21 and the clearance groove 24 corresponding to the support member 10. The bending limiting part 3 can be designed as a raised step or wall on the base 2, the height and shape of which match the bending area of ​​the support member 10, and is formed by integral processing. As another implementation, the bending limiting part 3 can be designed as an adjustable limiting block, which is fixed to the base 2 by screws, so as to facilitate fine adjustment according to different bending angles of the support member 10.

[0028] The base 2 is provided with a mold closing part corresponding to the mold closing mechanism 4. The mold closing part can be designed as a flat or inclined surface on the base 2 that contacts the mold closing mechanism 4, and its surface flatness and fitting accuracy can be ensured through precision machining. As another implementation, the mold closing part can be designed as an area on the base 2 with locating pin holes or guide grooves, which cooperate with the locating pins or guide blocks on the mold closing mechanism 4 to ensure precise alignment during mold closing.

[0029] The mold closing mechanism 4 abuts against the mold closing part and the bending limiting part 3. The mold closing mechanism 4 can directly contact the mold closing part and the bending limiting part 3 of the base 2 through its side or bottom to form a physical contact. As another implementation, the mold closing mechanism 4 can be designed with a structure with elastic gaskets or sealing rings to provide cushioning and better sealing effect during contact.

[0030] A clearance space 42 is formed between the outer wall of the mold closing mechanism 4, the bending limiting part 3, and the clearance groove 24. The clearance space 42 can be designed with a specific shape to allow for a gap between the mold closing mechanism 4 and the bending limiting part 3 and the clearance groove 24 when the mold is closed. This gap is sufficient to accommodate the bent end 103 of the support member 10. Alternatively, the clearance space 42 can be adjusted by changing the relative position between the mold closing mechanism 4 and the base 2 to ensure that the bent end 103 of the support member 10 is not squeezed during mold closing and to provide a demolding path for it.

[0031] A drive mechanism 5 is provided on the side of the mold clamping mechanism 4 away from the base 2. The drive mechanism 5 can be a hydraulic cylinder or a pneumatic cylinder, with its piston rod directly connected to the mold clamping mechanism 4. The reciprocating motion of the mold clamping mechanism 4 is achieved through hydraulic or pneumatic control. Alternatively, the drive mechanism 5 can be a lead screw mechanism driven by a servo motor. The rotation of the motor drives the lead screw nut to move, thereby driving the mold clamping mechanism 4.

[0032] The mold clamping mechanism 4 moves closer to or further away from the base 2 under the action of the drive mechanism 5. The drive mechanism 5 directly pushes or pulls the mold clamping mechanism 4 through linear motion, causing it to move closer to or further away from the base 2 along a preset guide path. Alternatively, the drive mechanism 5 can convert the rotary motion into linear reciprocating motion of the mold clamping mechanism 4 through a linkage mechanism or a cam mechanism, thereby achieving the action of moving closer to or further away from the base 2.

[0033] The upper molding mold 8 has an upper molding groove corresponding to the lower molding groove 21. The upper molding mold 8 can be designed as an integral structure that cooperates with the lower molding mold 1, and its upper molding groove and lower molding groove 21 form a complete cavity when the mold is closed. As another implementation, the upper molding mold 8 can be composed of multiple modules, and the module containing the upper molding groove can be replaced as needed to adapt to injection molded parts of different shapes.

[0034] The upper molding mold 8 has a gating station corresponding to the upper molding groove. The gating station can be designed as one or more direct gates on the upper molding mold 8, which lead directly to the cavity for injecting molten plastic. As another implementation, the gating station can be designed as multiple side gates or point gates connected by a runner system to achieve more uniform mold filling.

[0035] When the two support members 10 with bent ends 103 are placed in the lower molding groove 21, the mold closing mechanism 4 moves towards the base 2 under the action of the drive mechanism 5 and abuts against the mold closing part and the bending limiting part 3 of the base 2. During this process, a tight sealing structure is formed between the mold closing mechanism 4 and the bending limiting part 3, ensuring that the injection molding material only covers the main body 101 of the support member 10 and does not overflow to the bent part 102 and the ends 103. At the same time, the clearance groove 24 provides reserved space for the bent ends 103 of the support member 10, initially limiting them and preventing the support member 10 from undergoing undesirable deformation under high temperature injection pressure. This structure ensures the stability of the injection connection and avoids the impact on the bent area of ​​the support member 10, creating conditions for smooth demolding in the future.

[0036] The headphone headband injection molding mechanism of this application, through the coordinated action of the base 2 of the lower molding mold 1, the mold closing mechanism 4, and the upper molding mold 8, ensures that the main body 101 of the support member 10 is effectively injection molded and connected during the injection molding process by forming a seal between the mold closing mechanism 4 and the bending limiting part 3. At the same time, the clearance groove 24 provides initial limiting and space reservation for the bent end 103 of the support member 10. This effectively avoids deformation of the bent end of the support member 10 during high-temperature injection molding or interference with the mold structure, thus solving the problem of the difficulty in smoothly demolding the bent support member 10 in the prior art, and improving the part removal efficiency and product quality of the injection molded parts.

[0037] In one embodiment of this application, the lower forming groove 21 is provided with two mating grooves 22 symmetrically corresponding to the two support members 10; The mating groove 22 has a protruding mounting part 23 for connecting with the support 10; the mounting part 23 passes through the base 2.

[0038] Specifically, two mating grooves 22 are symmetrically arranged within the lower molding groove 21 corresponding to the two support members 10. These mating grooves 22 are recesses or cavities specifically designed inside the lower molding groove 21 to accommodate the main body 101 of the support member 10. Their shape and size match the main body 101 of the support member 10, providing initial positioning and support for the support member 10. This symmetrical arrangement ensures that the two support members 10 maintain balance and consistency during injection molding, facilitating the formation of a symmetrical headphone headband.

[0039] A mounting member 23 protrudes from the mating groove 22 for connection with the support member 10. This mounting member 23 is typically a pin, boss, or snap-fit ​​structure, protruding inward from the bottom or side wall of the mating groove 22. A mechanical connection is formed between the mounting member 23 and the support member 10, for example, through a pre-drilled hole, slot, or specific shape on the support member 10, thereby firmly fixing the support member 10 within the mating groove 22. This protruding mounting member 23 effectively prevents the support member 10 from shifting or floating during the injection molding process due to injection pressure or material flow impact.

[0040] Mounting element 23 extends through the base 2. This means that mounting element 23 is not merely a feature on the surface of the mating groove 22, but rather extends through the entire thickness of the base 2. This through-type design allows mounting element 23 to form an integral unit with the base 2, greatly enhancing the structural strength and stability of mounting element 23. Mounting element 23 can be connected to the base 2 by means of bolts, rivets, or integral molding, ensuring that it will not loosen or be damaged when subjected to high injection molding pressure.

[0041] Through the above technical solution, symmetrical mating grooves 22 are arranged in the lower molding groove 21 corresponding to the two support members 10, and mounting parts 23 for interconnection with the support members 10 are protruding in the mating grooves 22. Simultaneously, the mounting parts 23 penetrate the base 2. This application effectively solves the problems of inaccurate positioning, easy displacement, and incomplete encapsulation of injection molded material in the support members 10 during injection molding. The symmetrical mating grooves 22 provide precise initial positioning space for the two support members 10, ensuring the symmetry and consistency of the injection molded parts. The direct connection between the mounting parts 23 and the support members 10 can firmly fix the support members 10 in the preset position, preventing any form of displacement or deformation under the high temperature and high pressure injection molding environment. More importantly, the design of the mounting parts 23 penetrating the base 2 greatly enhances the structural strength and stability of the mounting parts 23 themselves, enabling them to withstand the enormous pressure during the injection molding process and avoiding structural damage caused by insufficient strength of the mounting parts 23. This stable fixing method ensures that the injection molding material can completely and evenly wrap the main body 101 of the support 10, thereby significantly improving the overall structural stability, connection strength and product quality of the injection molded part, and also facilitating subsequent mold opening and part removal operations.

[0042] In one embodiment of this application, the bending limiting part 3 is detachably connected to the base 2, and the bending limiting part 3 is provided with a sealing connection part 31 that cooperates with the mold closing mechanism 4 on the main body part 101 of the support member 10. The bending limiting part 3 is provided with a bending fixing part 32 at the bending part 102 between the main body 101 and the end 103 of the support member 10.

[0043] Specifically, the bending limiting part 3 and the base 2 are connected in a detachable manner, for example, by mechanical fasteners such as bolts, pins or clips, or by a dovetail joint structure to achieve quick assembly and disassembly. This design allows the bending limiting part 3 to be easily removed from the base 2 for maintenance, replacement or adaptation to different specifications of the support parts 10, without requiring large-scale modifications to the entire base 2.

[0044] Meanwhile, the bending limiting part 3 is provided with a sealing connection part 31 corresponding to the main body 101 of the support member 10, which cooperates with the mold clamping mechanism 4. This sealing connection part 31 is usually designed as a protrusion or groove with a specific geometry, such as a stepped surface, a slope, or a structure with a sealing ring groove, designed to fit tightly with the corresponding mating surface of the mold clamping mechanism 4. When the mold clamping mechanism 4 abuts against the base 2, an effective seal is formed between the sealing connection part 31 and the mold clamping mechanism 4, thereby preventing the injection molding material from overflowing from this area during the injection molding process and ensuring that the injection molding material accurately wraps the main body 101 of the support member 10.

[0045] Furthermore, the bending limiting part 3 provides a bending fixing part 32 corresponding to the bending portion 102 of the support member 10 located between the main body 101 and the end 103. This bending fixing part 32 is typically designed as a cavity or groove that matches the bending shape of the support member 10, precisely accommodating and restricting the bending area of ​​the support member 10. For example, for a support member 10 with a specific bending radius, the bending fixing part 32 will provide a corresponding arc-shaped support surface. This fixing part provides stable support and precise positioning for the bending area of ​​the support member 10 during injection molding, effectively preventing displacement or deformation of the support member 10 under high temperature and high pressure injection molding conditions, ensuring the dimensional accuracy and shape stability of the product after injection molding.

[0046] Through the above technical solution, the bending limiting part 3 is designed to be detachably connected to the base 2, which significantly improves the maintenance convenience and versatility of the mold. When the bending limiting part 3 needs to be replaced due to wear or to adapt to different support parts 10 specifications, the operation becomes simple and quick, effectively shortening downtime and improving production efficiency. The sealing connection part 31 ensures a tight fit between the mold closing mechanism 4 and the bending limiting part 3, effectively preventing the overflow of injection molding material and ensuring the quality and precision of the injection molded parts, especially avoiding accidental wrapping of the bending part 102 and end 103 of the support part 10. The bending fixing part 32 further enhances the positioning and support of the bending area of ​​the support part 10, effectively suppressing the deformation of the support part 10 during high-temperature injection molding, thereby ensuring the dimensional stability and reliability of the final product. Overall, this solution not only optimizes the mold's structural design, making it more flexible and maintainable, but also ensures the quality and consistency of the headphone headband injection molded parts through precise positioning and sealing. In particular, it can better protect the non-injection molded areas of the support part 10 with the end 103 bent and folded, ensuring product functionality.

[0047] In one embodiment of this application, the mold closing mechanism 4 is provided with a first limiting member 41 facing the relief groove 24. When the mold closing mechanism 4 abuts against the base 2, the first limiting member 41 passes through the relief groove 24 and is connected to the support member 10.

[0048] Specifically, the first limiting member 41 is a structure used to precisely fix the support member 10. It can be designed as a pin, protrusion, claw, or a pressure block with a specific geometry. Its material is typically a high-strength, wear-resistant metal, such as tool steel or cemented carbide, to ensure structural integrity and positioning accuracy under long-term high-pressure injection molding conditions. The size and shape of the first limiting member 41 should match the end 103 of the support member 10 and the internal structure of the clearance groove 24 to achieve a stable connection and limiting function. "Passing through the clearance groove 24" means that the first limiting member 41 can extend into or pass through the internal space of the clearance groove 24 when the mold closing mechanism 4 is near the base 2. This requires that the clearance groove 24 be designed with a channel or opening corresponding to the first limiting member 41, allowing the first limiting member 41 to smoothly enter and contact the end 103 of the support member 10. This passing-through method ensures that the first limiting member 41 can penetrate deep into the end 103 of the support member 10, thereby achieving effective fixation of the support member 10. The connection to the support member 10 refers to the physical fixation between the first limiting member 41 and the end 103 of the support member 10. This connection can take various forms, such as tight fit, snap-fit, compression, or insertion fit. For example, the end 103 of the support member 10 can be pre-designed with holes, grooves, or specific shaped features to mate with the corresponding structure of the first limiting member 41. Through this connection, the first limiting member 41 can directly apply a restraining force to the end 103 of the support member 10, thereby firmly fixing it in a preset position and preventing any form of displacement or deformation during injection molding.

[0049] Through the above technical solution, a first limiting member 41 is provided on the mold clamping mechanism 4. When the mold clamping mechanism 4 abuts against the base 2, the first limiting member 41 passes through the relief groove 24 and connects to the support member 10. This application can provide a more direct and stable mechanical fixation for the end 103 of the support member 10. Compared with relying solely on the relief groove 24 for initial limiting, the direct connection between the first limiting member 41 and the support member 10 can effectively resist the high-pressure impact and flow shear force of the molten material during injection molding, thereby significantly reducing the risk of displacement, bending, or twisting of the end 103 of the support member 10. This precise and firm positioning ensures the dimensional accuracy and shape stability of the injection molded part, avoids injection molding defects caused by deformation of the support member 10, and thus improves the product qualification rate and consistency. At the same time, since the support member 10 maintains its preset position during injection molding, it also creates favorable conditions for smooth demolding and reduces the damage that may be caused to the product during demolding.

[0050] In one embodiment of this application, the clearance groove 24 is recessed with a limiting groove 25 at the end 103 of the support member 10; The limiting groove 25, the first limiting member 41, and the clearance space 42 form a stable space with the corresponding support member 10.

[0051] Specifically, the clearance groove 24 has a limiting groove 25 recessed at the end 103 of the support member 10. This limiting groove 25 is a further refined structure within the clearance groove 24, with its shape and size precisely matching the end 103 of the support member 10, aiming to provide a tighter fit and more precise positioning for the end 103 of the support member 10. By providing the limiting groove 25 within the clearance groove 24, the free movement space of the end 103 of the support member 10 during the injection molding process can be effectively reduced, thereby enhancing its stability. The limiting groove 25 can adopt a groove design that matches the shape of the end 103 of the support member 10, such as a U-shaped, V-shaped, or rectangular groove, to ensure that the end 103 of the support member 10 can be firmly engaged within it. Based on this, the limiting groove 25, the first limiting member 41, and the clearance space 42 form a stable space corresponding to the support member 10. This stable space is not an independent physical component, but rather a region formed by the synergistic effect of the three elements mentioned above. Its core function is to provide comprehensive and multi-dimensional constraints and protection for the end 103 of the support member 10. When the mold closing mechanism 4 abuts against the base 2, the first limiting member 41 passes through the clearance groove 24 and connects to the support member 10. At this time, the end 103 of the support member 10 is precisely held by the limiting groove 25 and connected from one direction by the first limiting member 41, while the clearance space 42 surrounds and restricts the overall range of motion of the end 103 of the support member 10 from the outside. These three elements together construct a highly stable closed or semi-closed region, ensuring that the end 103 of the support member 10 can maintain its preset geometric shape and position during injection molding, effectively resisting deformation that may be caused by injection pressure and high temperature.

[0052] Through the above technical solution, a limiting groove 25 that precisely matches the end 103 of the support member 10 is further recessed within the clearance groove 24. This application can provide a tighter and more precise positioning for the end 103 of the support member 10. When the mold closing mechanism 4 abuts against the base 2, the limiting groove 25, together with the first limiting member 41 and the clearance space 42, forms a highly stable protective area, i.e., a stable space, around the end 103 of the support member 10. This stable space can constrain and support the end 103 of the support member 10 from multiple directions, effectively offsetting the impact force, shear force, and material softening effect caused by high temperature generated during injection molding, thereby significantly reducing the risk of deformation of the end 103 of the support member 10. This enhanced stability not only ensures the dimensional accuracy and appearance quality of the injection molded part, but also greatly simplifies the part removal operation after mold opening because the support member 10 can maintain its original shape after injection molding, avoiding jamming or damage caused by deformation of the support member 10, and improving production efficiency and product yield.

[0053] In some embodiments of this application, although the first limiting member 41, the limiting groove 25, and the clearance space 42 provide a stable protective structure for the end 103 of the support member 10, effectively preventing deformation of the support member 10 during injection molding, thus facilitating part removal after mold opening, in actual operation, after the injection-molded part is completed and the mold is opened, the end 103 of the support member 10 may still remain bent. This may hinder the smooth removal of the molded part in some cases, and may even cause unnecessary stress or damage to the molded part or support member 10 during the removal process, affecting production efficiency and product yield.

[0054] In response, this application further proposes an improved injection molding mechanism for headphone headband components, wherein the lower molding mold 1 also includes a base 6. The base 6 serves as the fundamental support structure of the entire injection molding mechanism, supporting and securing other major components, such as the base 2, the mold clamping mechanism 4, and the drive mechanism 5, all securely connected to the base 6. The base 6 is typically made of robust metal and is fixed to the aforementioned components via bolts, welding, or other mechanical connections to ensure it can withstand high pressure and vibration during injection molding, thereby providing a stable mounting platform and guaranteeing the relative positional accuracy between components and the stability of the overall structure. Furthermore, the base 6 is provided with a second limiting member 65 corresponding to the limiting groove 25. This second limiting member 65 is a component used to further fix and operate the end 103 of the support member 10. When the support member 10 is fixed to the lower molding groove 21, the second limiting member 65 can be reliably connected to the end 103 of the support member 10. The second limiting member 65 can be a movable pin, clamp, or block with a specific shape, connected to the end 103 of the support member 10 by mechanical means (such as snapping, clamping, insertion, etc.). This connection provides additional positioning and support for the bent end 103 of the support member 10, ensuring its precise position during the injection molding process and providing a controllable interface for subsequent part removal operations. It works in conjunction with the first limiting member 41 to ensure the stability of the support member 10 during the injection molding process.

[0055] Through the above technical solution, the base 6 is introduced as a support platform for the overall mechanism, allowing the base 2, mold closing mechanism 4, and drive mechanism 5 to be stably connected to it. This greatly enhances the structural strength and stability of the entire injection molding mechanism, ensuring precise alignment and coordinated operation of each component under high-pressure injection molding conditions. Simultaneously, a second limiting member 65 is provided on the base 6, connecting to the end 103 of the support member 10 when the support member 10 is fixed to the lower molding groove 21. This provides a more direct and reliable fixation and support for the bent end 103 of the support member 10. This not only further enhances the positioning accuracy of the support member 10 during the injection molding process and effectively avoids minor deformations that may occur due to high-temperature injection molding, but more importantly, it provides a controllable interface for subsequent mold opening and part removal operations. By connecting the end 103 of the support member 10 with the second limiting member 65, auxiliary operations can be performed on the end 103 of the support member 10 after the mold is opened, such as slight pushing or guiding. This significantly reduces the risk of interference between the molded part and the mold or the bending part 102 of the support member 10 when it is taken out, improves the smoothness and efficiency of taking out the part, and effectively protects the integrity of the injection molded part and the support member 10.

[0056] In some embodiments of this application described above, although the second limiting member 65 connected to the end 103 of the support member 10 can provide limiting and protection for the end 103 of the support member 10 during the injection molding process, preventing its deformation, after injection molding is completed, when the upper molding mold 8, the lower molding mold 1, and the mold closing mechanism 4 open to each other, the end 103 of the support member 10 is still in a bent state and constrained by the limiting groove 25 and the clearance space 42. This may cause the injection molded part to encounter obstacles when being removed, and may even cause unnecessary stress or damage to the molded part or the support member 10 during the removal process, affecting the removal efficiency and product yield.

[0057] In this regard, this application further proposes that the base 2 is provided with a limiting groove 26 corresponding to the second limiting member 65. One side of the second limiting member 65 is slidably connected to the limiting groove 26, and the other side is slidably connected to the base 6. The base 6 is provided with a driving component 62 corresponding to the second limiting member 65. When the upper molding mold 8, the lower molding mold 1, and the mold closing mechanism 4 open with each other, the second limiting member 65, under the action of the driving component 62, causes the end 103 of the support member 10 to move away from the limiting groove 25. Specifically, after the mold closing mechanism 4, the lower molding mold 1, and the upper molding mold 8 open, the driving component 62 can drive the second limiting member 65 to push the end 103 of the support member 10 to move away from the clearance groove 24. This non-high-temperature pushing process only causes the end 103 of the support member 10 to temporarily deform, so that the end 103 of the support member 10 is converted to a vertical state as much as possible, which is beneficial for the removal of the injection molded part. The molded part can be quickly restored after removal.

[0058] To ensure the precise movement of the second limiting member 65, the base 2 is provided with a limiting groove 26 that mates with the second limiting member 65. This limiting groove 26 can be designed as a U-shaped groove, dovetail groove, or T-shaped groove, etc., and its internal dimensions and shape closely match the sliding side of the second limiting member 65, thereby providing stable sliding guidance and limiting function for the second limiting member 65. This design effectively prevents the second limiting member 65 from deviating or jamming during movement, ensuring the accuracy of its movement trajectory.

[0059] One side of the second limiting member 65 is slidably connected to the limiting groove 26 on the base 2, while its other side is slidably connected to the base 6. This dual sliding connection configuration provides the second limiting member 65 with multi-point support and precise guidance, enabling it to maintain high stability and smoothness during movement. For example, the side of the second limiting member 65 can be provided with a slider or guide protrusion to form a sliding engagement with the limiting groove 26 and the corresponding guide rails or planes on the base 6. To reduce frictional resistance and extend service life, the sliding contact surfaces can be made of self-lubricating materials or subjected to appropriate lubrication treatment.

[0060] A drive assembly 62 is provided on the base 6 at the position corresponding to the second limiting member 65, and its function is to provide the required power to the second limiting member 65. This drive assembly 62 can take various forms, such as a cylinder, a hydraulic cylinder, a stepper motor with a lead screw transmission mechanism, a cam mechanism, or a linkage mechanism. The specific drive method selected will be comprehensively considered based on actual requirements such as the required thrust, travel distance, positioning accuracy, and response speed. The drive assembly 62 enables the second limiting member 65 to actively move, thereby achieving attitude adjustment of the end 103 of the support member 10.

[0061] This technical solution clarifies the timing and purpose of the second limiting member 65's action. After the injection-molded part cools and solidifies, when the mold (including the upper molding mold 8, the lower molding mold 1, and the mold closing mechanism 4) completes the mold opening action, the drive component 62 is activated. At this time, the drive component 62 drives the second limiting member 65, causing it to push or pull the end 103 of the support member 10 out of the limiting groove 25 and the clearance space 42 along a preset path. This movement process aims to cause temporary deformation of the bent end 103 of the support member 10, making its posture tend to be vertical, thereby releasing the constraint on the injection-molded part. Since this pushing process is carried out in an environment without high temperature, the material of the support member 10 (e.g., a metal strip) can undergo elastic deformation after being subjected to force and quickly return to its original shape after the external force is removed, avoiding permanent deformation and ensuring the integrity and functionality of the support member 10.

[0062] Through the above technical solution, after the injection molding process is completed, when the upper molding mold 8, the lower molding mold 1, and the mold closing mechanism 4 open relative to each other, the driving component 62 provided on the base 6 can promptly drive the second limiting member 65. Guided by the double sliding connection between the limiting groove 26 of the base 2 and the base 6, the second limiting member 65 can move precisely and stably in a direction away from the limiting groove 25, thereby pushing the end 103 of the support member 10. This active pushing action allows the end 103 of the support member 10, which was originally bent and constrained by the limiting groove 25, to temporarily deform, making it tend towards a vertical state, effectively releasing the constraint on the injection molded part. Since this pushing process is carried out in a non-high-temperature environment, the temporary deformation of the support member 10 can quickly recover after removal, avoiding permanent damage. Therefore, this solution greatly facilitates the smooth removal of the injection molded part, significantly improves the removal efficiency, reduces the risk of damage to the molded part or support member 10 due to poor removal, thereby improving product yield and production efficiency.

[0063] In one embodiment of this application, the driving component 62 includes: A connecting rod 63 is connected to the second limiting member 65 and passes through the base 6. The base 6 is provided with a working groove 61 corresponding to the moving path of the connecting rod 63. The driving component 64 is connected to the connecting rod 63. Under the action of the driving component 64, the connecting rod 63 slides back and forth in the working slide groove 61.

[0064] Specifically, the connecting rod 63 is a key transmission component in the drive assembly 62 used to connect the drive member 64 and the second limiting member 65. It precisely transmits the thrust or pull generated by the drive member 64 to the second limiting member 65, causing it to produce the expected linear movement. The connecting rod 63 passes through the base 6, meaning that part of it is located inside the base 6, and another part may extend outside the base 6 and connect to the drive member 64. This through-type structure helps guide the movement direction of the connecting rod 63 and provides necessary support. The connecting rod 63 can be a solid or hollow rod, with its two ends reliably connected to the second limiting member 65 and the drive member 64, respectively, for example, through threads, pins, or welding. Its material is typically a high-strength, wear-resistant metal to ensure structural integrity and force transmission efficiency during long-term reciprocating motion.

[0065] The working groove 61 is a structure installed on the base 6 to precisely guide the movement trajectory of the connecting rod 63. It ensures that the connecting rod 63, under the action of the drive member 64, can reciprocate along a preset straight path, thereby guaranteeing the accuracy of the movement direction and stroke of the second limiting member 65. The design of the working groove 61 needs to consider the fitting clearance with the connecting rod 63 to reduce friction and prevent jamming. The working groove 61 can be a U-shaped, V-shaped, or rectangular groove machined on the base 6, and its inner wall surface can be precision machined or coated with a low-friction material to ensure smooth sliding of the connecting rod 63. To further improve motion accuracy and reduce wear, a linear guide or sliding bearing can be installed inside the working groove 61.

[0066] The drive component 64 is the actuator that directly generates power and acts on the connecting rod 63, causing it to reciprocate within the working groove 61. It is the core power source of the entire drive assembly 62. The drive component 64 can take various forms. For example, it can be a pneumatic or hydraulic cylinder, directly connected to the connecting rod 63 via a piston rod, using pneumatic or hydraulic thrust to achieve reciprocating motion; it can also be an electric motor, such as a stepper motor or servo motor, converting rotary motion into linear reciprocating motion of the connecting rod 63 through a lead screw and nut mechanism, gear and rack mechanism, or linkage mechanism. The choice of drive component 64 depends on factors such as the required driving force, speed, accuracy, and cost.

[0067] Through the above technical solution, the driving component 62 is specifically defined as a combination of a connecting rod 63, a working slide 61, and a driving component 64. This application provides a driving scheme for a second limiting component 65 with a clear structure and reliable movement. The connecting rod 63, as a force transmission medium, accurately transmits the power of the driving component 64 to the second limiting component 65. The working slide 61 provided on the base 6 provides a stable guide for the connecting rod 63, effectively constraining the movement trajectory of the connecting rod 63 and ensuring that it slides back and forth along a preset direction, thereby avoiding deviation or jamming during movement. The driving component 64 can accurately drive the connecting rod 63 to slide back and forth in the working slide 61 according to control commands, thereby enabling the second limiting component 65 to stably and controllably push the end 103 of the support component 10, realizing its temporary deformation and reset. This structure not only improves the stability and accuracy of the movement of the second limiting component 65, but also simplifies the installation and maintenance of the entire driving mechanism 5, ensuring the smooth and efficient removal process of the injection molded part, while avoiding unnecessary damage to the support component 10.

[0068] In one embodiment of this application, the base 2 is symmetrically provided with two lower forming grooves 21, and two adjacent support members 10 in the two lower forming grooves 21 share a common clearance groove 24; The base 2 and the upper forming mold 8 are stably connected to each other through the positioning groove 7 and the positioning block.

[0069] Specifically, the base 2 is symmetrically provided with two lower molding grooves 21, meaning that two independent injection molding cavities are integrated on a single base 2, each cavity containing a lower molding groove 21. This symmetrical configuration makes the mechanism more structurally balanced, which is beneficial for processing two sets of support members 10 simultaneously in one injection cycle, thereby achieving double the production efficiency. The function of the lower molding groove 21 is the same as that of the lower molding groove 21 in the above embodiment, which is used to support the main body 101 of the support member 10 and form part of the injection molding cavity.

[0070] Two adjacent support members 10 within the two lower molding grooves 21 share a common clearance groove 24. This means that when the two lower molding grooves 21 are closely arranged, the bent ends 103 of the support members 10 they support can share a single clearance groove 24. The function of the clearance groove 24 is to provide sufficient space for the bent ends 103 of the support members 10, preventing them from being squeezed or deformed during injection molding. By sharing the clearance groove 24, the overall size of the base 2 can be effectively reduced, making the mechanism design more compact, thereby reducing the equipment's footprint and material costs. This design optimizes space utilization while ensuring the protection of the bent portions 102 of the support members 10.

[0071] The base 2 and the upper molding die 8 are stably connected to each other via a positioning groove 7 and a positioning block. This means that the base 2 has a positioning groove 7, and the upper molding die 8 has a positioning block that mates with the positioning groove 7, or vice versa. When the upper molding die 8 and the base 2 are closed, the positioning block is precisely inserted into the positioning groove 7, ensuring high-precision alignment between the upper molding die 8 and the base 2. This connection method effectively resists the enormous clamping force and injection pressure generated during injection molding, preventing mold misalignment or loosening, and ensuring the sealing and dimensional accuracy of the injection cavity. The positioning groove 7 and the positioning block can take various forms, such as cylindrical pins and holes, tapered pins and holes, dovetail grooves, etc., with the core purpose of providing reliable mechanical interlocking and positioning functions.

[0072] Through the above technical solution, two lower molding grooves 21 are symmetrically arranged on the base 2. This application enables the simultaneous injection molding of two headphone headband components in one mechanism, significantly improving production efficiency and effectively reducing the equipment's footprint. The design of adjacent support components 10 sharing a single clearance groove 24 further optimizes the spatial layout, making the mechanism more compact. Simultaneously, the stable connection between the base 2 and the upper molding mold 8 via the positioning groove 7 and positioning block ensures high-precision alignment and tight fit between the upper molding mold 8 and the lower molding mold 1 in multi-cavity injection molding mode. This effectively prevents misalignment, overflow, and other problems during the injection molding process, thereby guaranteeing the quality and consistency of the injection-molded parts and improving the stability and reliability of the entire injection molding mechanism.

[0073] In some embodiments described above in this application, an injection molding mechanism for an earphone headband is proposed, which completes injection molding through the cooperation of a lower molding mold 1 and an upper molding mold 8. However, in actual production, a single injection molding station needs to sequentially perform operations such as loading and unloading the support component 10, mold closing, injection molding, and mold opening and part removal. This serialized workflow causes the injection molding machine to be in a non-productive state while waiting for loading / unloading or part removal, thereby reducing overall production efficiency and equipment utilization.

[0074] In this regard, this application further proposes that the mechanism also includes a turntable 9, which has at least two mounting positions for mounting the lower molding mold 1, and the upper molding mold 8 has one mounting position; one of the at least two mounting positions is a loading / unloading position, and the other is an injection position, with the upper molding mold 8 corresponding to the injection position.

[0075] The turntable 9 is a rotatable platform structure whose main function is to support multiple lower forming dies 1 and to sequentially deliver different lower forming dies 1 to different work stations through rotation. The turntable 9 can be driven by a servo motor, stepper motor, or other precision indexing mechanism (e.g., cam indexer, Geneva wheel mechanism) to achieve precise intermittent or continuous rotation positioning, ensuring that each mounting position can accurately stop at the preset working position.

[0076] The turntable 9 has at least two mounting positions for installing the lower molding die 1. These mounting positions are areas on the turntable 9 specifically designed for fixing the lower molding die 1. Each mounting position should have sufficient strength and precision to ensure that the lower molding die 1 can be stably and reliably fixed during injection molding. The mounting positions can be fixed with quick-clamping mechanisms (such as hydraulic clamps, pneumatic clamps, or mechanical bolts) to facilitate quick replacement and positioning of the lower molding die 1, thereby adapting to the production needs of different specifications or batches.

[0077] The upper mold 8 corresponds to a mounting position, which means that the upper mold 8 is usually fixed on the injection molding machine, or vertically raised and lowered by an independent drive mechanism 5, so that it can perform mold closing operation with the lower mold 1 located at the injection position. This configuration ensures the centralization and efficiency of the injection molding process, that is, only the lower mold 1 at the injection position cooperates with the upper mold 8 to perform injection molding.

[0078] At least two mounting positions are provided, one for loading / unloading and the other for injection molding. The loading / unloading position is used for manual or automated robotic arms to place the support component 10 and remove the injection-molded part. This position is typically located within easy reach of the operator or within the robotic arm's working range. The injection molding position is where the actual injection molding operation takes place. Here, the injection molding machine's nozzle engages with the lower mold 1 and upper mold 8 after mold closing, injecting molten plastic. By spatially separating the loading / unloading and injection molding operations and using the turntable 9 for position switching, the production process is parallelized.

[0079] By introducing a turntable 9 and setting at least two mounting positions for installing the lower molding die 1, one of which serves as the loading / unloading position and the other as the injection molding position, the loading / unloading operation and the injection molding operation can be performed in parallel. While one lower molding die 1 is performing injection molding at the injection molding position, the other lower molding die 1 can be used at the loading / unloading position to load the support component 10 or remove the molded part. The periodic rotation of the turntable 9 allows for efficient switching between the various stations, thereby significantly shortening the entire production cycle and improving equipment utilization and production efficiency. This parallel processing method effectively avoids equipment idleness caused by waiting for loading / unloading in the traditional single-station mode, ensuring the continuity and high output of the injection molding process.

[0080] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, 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, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0081] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A headphone headband injection molding mechanism for injection molding a support member with bent and retracted ends, characterized in that, include: The lower forming mold includes a base and a mold closing mechanism. The upper surface of the base has a lower forming groove corresponding to the main body of the support member, and the lower surface of the base has a clearance groove corresponding to the end of the support member. The base has a bending limiting part corresponding to the support member between the lower forming groove and the clearance groove, and a mold closing part corresponding to the mold closing mechanism. The mold closing mechanism abuts against the mold closing part and the bending limiting part. A clearance space is formed between the outer wall of the mold closing mechanism, the bending limiting part, and the clearance groove. A driving mechanism is provided on the side of the mold closing mechanism away from the base. The mold closing mechanism moves closer to or away from the base under the action of the driving mechanism. The upper forming mold is provided with an upper forming groove corresponding to the lower forming groove, and a casting position is provided corresponding to the upper forming groove.

2. The headphone headband injection molding mechanism according to claim 1, characterized in that, The lower forming groove is symmetrically provided with two mating grooves corresponding to the two support members; The mating groove is provided with a mounting component for connecting with the support component; the mounting component extends through the base.

3. The headphone headband injection molding mechanism according to claim 1, characterized in that, The bending limiting part is detachably connected to the base, and the bending limiting part is provided with a sealing connection part that cooperates with the mold closing mechanism on the main body of the support member. The bending limiting part is provided with a bending fixing part corresponding to the bending part of the support member located between the main body and the end.

4. The headphone headband injection molding mechanism according to claim 1, characterized in that, The mold closing mechanism is provided with a first limiting member facing the clearance groove. When the mold closing mechanism abuts against the base, the first limiting member passes through the clearance groove and is connected to the support member.

5. The headphone headband injection molding mechanism according to claim 4, characterized in that, The end of the support member corresponding to the clearance groove is recessed with a limiting groove; The limiting groove, the first limiting member, and the corresponding support member of the clearance space form a stable space.

6. The headphone headband injection molding mechanism according to claim 5, characterized in that, The lower forming mold also includes a base, and the base, the mold closing mechanism and the drive mechanism are all connected to the base; The base is provided with a second limiting member corresponding to the limiting groove. When the support member is fixed in the lower forming groove, the second limiting member is connected to the end of the support member.

7. The headphone headband injection molding mechanism according to claim 6, characterized in that, The base is provided with a limiting groove corresponding to the second limiting member. One side of the second limiting member is slidably connected to the limiting groove, and the other side is slidably connected to the base. The base is equipped with a driving component corresponding to the second limiting member. When the upper forming mold, the lower forming mold, and the mold closing mechanism open with each other, the second limiting member, under the action of the driving component, causes the end of the support member to move away from the limiting groove.

8. The headphone headband injection molding mechanism according to claim 7, characterized in that, The driving component includes: A connecting rod is connected to a second limiting member and passes through a base. The base is provided with a working groove corresponding to the moving path of the connecting rod. A driving component is connected to a connecting rod, and the connecting rod reciprocates within the working groove under the action of the driving component.

9. The headphone headband injection molding mechanism according to claim 1, characterized in that, The base is symmetrically provided with two lower forming grooves, and two adjacent support members in the two lower forming grooves share a common clearance groove. The base and the upper forming mold are stably connected to each other through positioning grooves and positioning blocks.

10. The headphone headband injection molding mechanism according to claim 1, characterized in that, It also includes a turntable, which has at least two mounting positions for mounting the lower forming mold, and the upper forming mold has one mounting position.

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