Injection molding device for light and thin keycaps

Abstract

The invention relates to the technical field of keycap processing, and discloses an injection molding device of a light and thin keycap, which comprises a front mold base and a rear mold base, one end face of the rear mold base far away from the front mold base is movably connected with a movable base, one end face of the movable base facing the rear mold base is provided with a plurality of lifting pin assemblies and ejector rods, and the lifting pin assemblies are inserted into a rear mold core. The end, away from the movable seat, of the ejector pin assembly penetrates through the mold core, the pouring part is provided with an ejection through hole for the ejector rod to penetrate through, the ejection through hole communicates with the liquid injection runner, and the ejector rod is slidably connected with the ejection through hole; the movable seat is arranged beside the rear mold seat, and a plurality of groups of ejector pin assemblies and ejector rods are arranged to be inserted into the mold core in the rear mold core and the ejection through hole in the pouring piece, so that the simultaneous ejection of a keycap finished product and runner waste is realized, the problem of non-uniform force transmission in the ejection process can be effectively reduced in the production process of a light and thin keycap, and the production efficiency of the light and thin keycap is improved. The limitation that runner waste is dragged depending on a keycap product is avoided, and the risk that the keycap is broken due to local stress concentration is remarkably reduced.

Description

Technical Field

[0001] The invention relates to the technical field of key cap processing, and in particular to an injection molding device for a thin key cap. Background Art

[0002] With the rapid development of the electronic products market and the current market trend towards thin and light laptops, consumers have higher and higher requirements for the thinness, beauty and comfort of keyboard products. As an important part of the keyboard, the design and manufacture of keycaps directly affect the consumer's experience and the market competitiveness of the product. At present, the production of thin and light keycaps mainly relies on the injection molding process. With the advantages of high efficiency and mass production of injection molding, injection molding has become the mainstream choice for keycap manufacturing. With the increasing demand for product portability and high performance, the industry has gradually improved the precise control of injection molding equipment and process parameters to ensure that the product's dimensional accuracy, surface finish and mechanical properties meet higher standards. Existing injection molding devices for thin and light keycaps generally adopt a straight-through runner design, and only set an inclined ejector pin at the finished keycap for ejection. This can simplify the mold structure and manufacturing cost to a certain extent, but it also has obvious disadvantages. Relying on a single inclined ejector pin ejection design at the finished keycap, the solidified waste in the runner cannot be effectively ejected at the same time when the finished product is ejected from the mold. It only relies on the drag of the keycap, which can easily lead to uneven ejection during the ejection force transmission process. Especially in the thin and light keycap structure, it may cause local stress concentration and increase the risk of product rupture, which not only affects the product qualification rate, but also causes durability problems in the later use of the product.

[0003] Therefore, it is necessary to provide an injection molding device for a thin keycap to solve the above-mentioned problem of uneven ejection due to reliance on a single inclined ejector pin, thereby increasing the risk of product breakage. Summary of the invention

[0004] The main purpose of the present invention is to provide an injection molding device for a thin keycap, aiming to solve the technical problems mentioned in the above background technology.

[0005] The present invention adopts the following technical solutions: An injection molding device for a thin keycap comprises a front mold base and a rear mold base that moves relative to the front mold base, wherein the front mold base is embedded with a front mold core on one end face close to the rear mold base, and the rear mold base is embedded with a rear mold core on one end face close to the front mold base, and the rear mold core is provided with a plurality of cores and injection channels on one end face close to the front mold core, the front mold core is provided with a mold cavity corresponding to the core and an injection pipe corresponding to the injection channel, and a plurality of castings are inserted in the rear mold core, and the castings are provided with a horn-shaped pouring port, and the injection channel is connected to the core through the pouring port; The rear mold base is movably connected to a movable seat at one end face away from the front mold base, and a plurality of ejector pin assemblies and ejector rods are provided on one end face of the movable seat facing the rear mold base. The ejector pin assembly is inserted into the rear mold core, and one end of the ejector pin assembly away from the movable seat penetrates the core. The casting is provided with an ejector through hole for the ejector rod to pass through, the ejector through hole is communicated with the injection channel, and the ejector rod is slidably connected to the ejector through hole.

[0006] Further, the ejector pin assembly includes a plurality of inclined ejector pins and a flat ejector pin, the inclined ejector pin includes a fixed pin rod and a swing pin rod, the fixed pin rod is fixedly connected to the movable seat, an end of the fixed pin rod away from the movable seat is provided with a movable protrusion, the swing pin rod is movably connected to the movable protrusion via a movable groove, and an end of the swing pin rod away from the movable groove is provided with a groove for keycap molding and penetrates the core; The flat top pin is fixedly connected to the movable seat, and one end of the flat top pin away from the movable seat penetrates the core, wherein when the movable seat is stationary, one end of the swing pin away from the movable groove and one end of the flat top pin away from the movable seat are respectively flush with the end surface of the core.

[0007] Furthermore, a fixed seat is provided at the end of the front mold base facing away from the rear mold base, a plurality of guide columns are provided at the end of the fixed seat close to the front mold base, a connecting seat is fixedly connected to the end of the guide column away from the fixed seat, the guide columns penetrate the front mold base and the rear mold base respectively, the front mold base is provided with a first guide hole for the guide column to pass through, the rear mold base is provided with a second guide hole for the guide column to pass through, and the rear mold base is slidably connected to the guide rod through the second guide hole.

[0008] Furthermore, a limiting column is provided in the movable seat, and two ends of the limiting column are fixedly connected to the rear mold seat and the connecting seat respectively; A plurality of telescopic columns are arranged at one end of the movable seat close to the rear mold seat, and an end of the telescopic column away from the movable seat is inserted into the rear mold seat and fixedly connected to the rear mold seat, and an elastic member is sleeved on the outer side of the telescopic column.

[0009] Furthermore, one end surface of the connecting seat away from the movable seat is fixedly connected to the telescopic end of the telescopic driving member, and the telescopic driving member is used to drive the connecting seat to drive the rear mold base to move toward the front mold base; The connecting seat is provided with an avoidance hole, and the avoidance hole is slidably connected to a pushing rod, one end of the pushing rod is fixedly connected to the movable seat, and when the telescopic driving member drives the rear mold seat to move in a direction away from the front mold seat, the end of the pushing rod away from the movable seat abuts against the telescopic driving member to push the movable seat so that the ejector pin assembly penetrates the core and the ejector rod slides to the injection channel.

[0010] Furthermore, it also includes a plurality of positioning components, the positioning components including a positioning concave block and a positioning convex block, the positioning concave block is fixedly connected to the front mold base, and the positioning convex block is fixedly connected to the rear mold base; Wherein, the positioning concave block is provided with a positioning groove, and the positioning convex block is provided with a positioning protrusion matched with the positioning groove. When the positioning protrusion is inserted into the positioning groove, an end face of the rear mold core close to the front mold core presses against the front mold core.

[0011] Furthermore, a concave portion is provided on one end surface of the casting close to the front mold core, and the shape of the concave portion matches the injection channel; The pouring gate is arranged on two opposite sides of the recessed part, the outlet of the pouring gate faces the recessed part, and one end of the pouring gate away from the recessed part is embedded in the core and flush with one side of the core close to the recessed part.

[0012] Furthermore, a drainage portion is provided on one side of the pouring port toward the recessed portion, and the drainage portion is provided at one end of the core close to the rear mold core, so that after the cavity is matched with the core, the injection fluid is dispersed along the drainage portion to fill the cavity.

[0013] Further, a liquid storage tank is provided at one end of the front mold base away from the rear mold base, and an end surface of the liquid storage tank away from the front mold base is fixedly connected to the fixed base, and a receiving chamber is provided in the liquid storage tank, and a liquid storage box is installed in the receiving chamber, and a heating pipe is arranged around the liquid storage box; The end of the liquid storage box close to the front mold base is fixedly connected to the liquid injection tube, the liquid injection tube penetrates the liquid storage tank and the front mold base, the end of the liquid injection tube away from the liquid storage box is connected to the liquid injection channel, the end of the liquid storage box away from the front mold base is fixedly connected to the feed pipe, and the feed pipe penetrates to the side of the fixed base away from the liquid storage box.

[0014] Furthermore, it also includes a first cooling pipe and a second cooling pipe, the first cooling pipe is inserted through the front mold base and the front mold core, the second cooling pipe is inserted through the rear mold base and the rear mold core, and the end of the first cooling pipe and the end of the second cooling pipe are respectively connected to pipe joints.

[0015] Beneficial effects: In the present invention, the connection between the injection channel and the core is realized through the casting part under the construction of the bull-horn type pouring gate, which effectively integrates and optimizes the injection structure of the channel and the molding space, reduces the complexity of the mold, and arranges a movable seat beside the rear mold base and equips multiple sets of ejector pin assemblies and ejector rods to insert into the core in the rear mold core and the ejection through hole in the casting part, so that the keycap finished product and the runner waste are ejected at the same time, thereby enhancing the force distribution during the ejection process. In the production process of thin and light keycaps, multi-point ejection can effectively reduce the problem of uneven force transmission generated during the ejection process, avoid the limitation of relying solely on the keycap product itself to drag the runner waste, and significantly reduce the risk of keycap cracking caused by local stress concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an injection molding device for a thin keycap according to the present invention; Figure 2 It is a partial schematic diagram of an injection molding device for a thin keycap according to the present invention; Figure 3 It is a cross-sectional schematic diagram of an injection molding device for a thin keycap according to the present invention; Figure 4 It is a schematic diagram of a rear mold portion of an injection molding device for a thin keycap according to the present invention; Figure 5 It is a schematic diagram of the front mold core of the present invention; Figure 6 It is a schematic diagram of the rear mold core of the present invention; Figure 7 It is a partial schematic diagram of the movable seat of the present invention; Figure 8 yes Figure 7 A local enlarged schematic diagram of the middle A; Fig. 9 It is another cross-sectional schematic diagram of an injection molding device for a thin keycap according to the present invention.

[0017] Among them: 1. front mold base; 2. rear mold base; 3. front mold core; 31. cavity; 4. rear mold core; 41. core; 42. injection channel; 5. injection pipe; 6. casting; 61. pouring port; 62. ejector hole; 63. recessed part; 7. movable seat; 8. ejector pin assembly; 81. inclined ejector pin; 811. fixed pin rod; 812. swing pin rod; 82. flat ejector pin; 9. ejector rod; 10. fixed seat; 11. guide column; 12. connecting seat; 13. limit column; 14. telescopic column; 15. elastic member; 16. positioning assembly; 161. positioning concave block; 162. positioning convex block; 17. liquid storage bin; 18. liquid storage box; 19. feed pipe; 20. first cooling pipeline; 21. second cooling pipeline.

[0018] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0023] Reference Figures 1 to 6 and Figure 8The present invention proposes an injection molding device for a thin keycap, comprising a front mold base 1 and a rear mold base 2 that moves relative to the front mold base 1, wherein a front mold core 3 is embedded in one end face of the front mold base 1 close to the rear mold base 2, and a rear mold core 4 is embedded in one end face of the rear mold base 2 close to the front mold base 1, and a plurality of cores 41 and injection channels 42 are arranged on one end face of the rear mold core 4 close to the front mold core 3, and the front mold core 3 is provided with a mold cavity 31 corresponding to the core 41 and an injection pipe 5 corresponding to the injection channel 42, and a plurality of castings 6 are inserted in the rear mold core 4, and the casting 6 is provided with a horn-shaped pouring port 61, and the injection channel 42 is connected to the core 41 through the pouring port 61; The end face of the rear mold base 2 away from the front mold base 1 is movably connected with a movable seat 7, and the end face of the movable seat 7 facing the rear mold base 2 is provided with a plurality of ejector pin assemblies 8 and ejector rods 9, the ejector pin assembly 8 is inserted into the rear mold core 4, and the end of the ejector pin assembly 8 away from the movable seat 7 penetrates the core 41, the casting 6 is provided with an ejector through hole 62 for the ejector rod 9 to pass through, the ejector through hole 62 is communicated with the injection channel 42, and the ejector rod 9 is slidably connected with the ejector through hole 62.

[0024] In the above embodiment, the front mold base 1 and the relatively movable rear mold base 2 are respectively embedded with the front mold core 3 and the rear mold core 4. The rear mold core 4 is provided with a plurality of cores 41 and a liquid injection channel 42 on one end surface close to the front mold core 3. The front mold core 3 is provided with a mold cavity 31 corresponding to the core 41 and a liquid injection pipe 5 corresponding to the liquid injection channel 42. The rear mold core 4 is interspersed with a plurality of pouring pieces 6. The pouring piece 6 is provided with a horn-shaped pouring port 61. The liquid injection channel 42 is connected to the core 41 through the pouring port 61. The injection structure of the flow channel and the molding space is effectively integrated and optimized, and the complexity of the mold is reduced.

[0025] The end face of the rear mold base 2 of the device away from the front mold base 1 is movably connected to a movable seat 7, and the end face of the movable seat 7 facing the rear mold base 2 is provided with a plurality of ejector pin assemblies 8 and ejector rods 9. The ejector pin assembly 8 is inserted into the rear mold core 4, and the end thereof away from the movable seat 7 penetrates the core 41. The casting 6 is provided with an ejection through hole 62 for the ejector rod 9 to pass through, and the ejection through hole 62 is communicated with the injection flow channel 42, and the ejector rod 9 is slidably connected with the ejection through hole 62. The simultaneous ejection of the finished keycap and the flow channel waste is achieved, and the force distribution during the ejection process is enhanced.

[0026] The bull-horn-shaped pouring gate 61 facilitates the rapid and uniform flow of the injection molding material, reduces the gate marks, and improves the appearance quality of the product. At the same time, the multi-point ejection mechanism can effectively reduce the problem of uneven force transmission during the ejection process, avoids the limitation of relying solely on the keycap product itself to drag the runner waste, and significantly reduces the risk of keycap cracking caused by local stress concentration.

[0027] To summarize, the connection between the injection channel 42 and the core 41 is achieved through the casting 6 under the construction of the bull-horn type pouring port 61, which effectively integrates and optimizes the injection structure of the channel and the molding space, reduces the complexity of the mold, and sets a movable seat 7 next to the rear mold base 2 and equips multiple sets of ejector pin assemblies 8 and ejector rods 9 to penetrate into the core 41 in the rear mold core 4 and the ejection through hole 62 in the casting 6, so that the finished keycap and the runner waste can be ejected simultaneously, thereby enhancing the force distribution during the ejection process. In the production process of thin and light keycaps, multi-point ejection can effectively reduce the problem of uneven force transmission generated during the ejection process, avoid the limitation of relying solely on the keycap product itself to drag the runner waste, and significantly reduce the risk of keycap breakage caused by local stress concentration.

[0028] refer to Figure 8 In one embodiment, the ejector pin assembly 8 includes a plurality of inclined ejector pins 81 and a flat ejector pin 82, the inclined ejector pin 81 includes a fixed pin rod 811 and a swing pin rod 812, the fixed pin rod 811 is fixedly connected to the movable seat 7, an end of the fixed pin rod 811 away from the movable seat 7 is provided with a movable protrusion, the swing pin rod 812 is movably connected to the movable protrusion through a movable groove, and an end of the swing pin rod 812 away from the movable groove is provided with a groove for keycap molding and penetrates the core 41; The flat top pin 82 is fixedly connected to the movable seat 7, and one end of the flat top pin 82 away from the movable seat 7 penetrates the core 41, wherein when the movable seat 7 is stationary, one end of the swing pin 812 away from the movable groove and one end of the flat top pin 82 away from the movable seat 7 are respectively flush with the end surface of the core 41.

[0029] The combination of the inclined ejector pin 81 and the flat ejector pin 82 enables the initial positioning of the keycap during the ejection process. When the movable seat 7 is stationary, the swing pin 812 and the flat ejector pin 82 together constitute a part of the core 41 and participate in the molding of the keycap. The fixed pin 811 of the inclined ejector pin 81 provides support for the swing pin 812, and the swing pin is movable within a certain range through the movable groove and the movable protrusion, allowing it to be properly adjusted according to the shape of the keycap during the ejection process, avoiding damage to the keycap, and further improving the accuracy and reliability of ejection.

[0030] refer to Figures 1 to 3In one example, a fixed seat 10 is provided at the end of the front mold base 1 facing away from the rear mold base 2, and a plurality of guide posts 11 are provided at the end of the fixed seat 10 close to the front mold base 1. The end of the guide posts 11 away from the fixed seat 10 is fixedly connected to a connecting seat 12, and the guide posts 11 penetrate the front mold base 1 and the rear mold base 2 respectively. The front mold base 1 is provided with a first guide hole for the guide posts 11 to pass through, and the rear mold base 2 is provided with a second guide hole for the guide posts 11 to pass through, and the rear mold base 2 is slidably connected to the guide rod through the second guide hole.

[0031] The front mold base 1 and the rear mold base 2 ensure the precise alignment of the mold base during the injection molding process through the cooperation of the guide column 11 and the guide hole, which not only improves the precision of injection molding, but also enhances the stability and durability of the mold base through the sliding connection of the guide column 11. During the injection molding process, due to the precise cooperation of the guide column 11 and the guide hole, the mold base misalignment caused by thermal expansion and contraction can be effectively prevented, thereby ensuring the consistency and quality of keycap molding.

[0032] refer to Figure 2 and Figure 7 In one embodiment, a limiting column 13 is provided in the movable seat 7, and both ends of the limiting column 13 are fixedly connected to the rear mold seat 2 and the connecting seat 12 respectively; A plurality of telescopic columns 14 are disposed at one end of the movable seat 7 close to the rear mold seat 2 , and an end of the telescopic columns 14 away from the movable seat 7 is inserted into the rear mold seat 2 and fixedly connected to the rear mold seat 2 . An elastic member 15 is sleeved on the outer side of the telescopic columns 14 .

[0033] The elastic member 15 is preferably a compression spring. The elastic member 15 can provide a certain elastic force, so that the telescopic column 14 can produce a certain buffer when subjected to force, thereby reducing the impact on the movement of the movable seat 7, and ensuring that the movable seat 7 pushes the injection-molded keycap to move smoothly after the injection molding is completed. After the injection molding is completed, the elastic member 15 can help the movable seat 7 to reset quickly, thereby improving the efficiency of injection molding. In addition, the presence of the limiting column 13 ensures the limiting effect of the movable seat 7 during the movement process, ensures the direction of the movable seat 7, and prevents the ejector pin assembly 8 and the ejector rod 9 in the movable seat 7 from affecting the ejection of the keycap.

[0034] In one embodiment, one end surface of the connecting seat 12 away from the movable seat 7 is fixedly connected to the telescopic end of the telescopic driving member, and the telescopic driving member is used to drive the connecting seat 12 to drive the rear mold base 2 to move toward the front mold base 1; The connecting seat 12 is provided with an avoidance hole, and the avoidance hole is slidably connected with a pushing rod, one end of the pushing rod is fixedly connected to the movable seat 7. When the telescopic driving member drives the rear mold base 2 to move away from the front mold base 1, the end of the pushing rod away from the movable seat 7 abuts against the telescopic driving member to push the movable seat 7 so that the ejector pin assembly 8 penetrates the core 41 and the ejector rod 9 slides to the injection channel 42.

[0035] One end of the push rod is fixedly connected to the movable seat 7, and the other end abuts the telescopic drive member when the telescopic drive member performs the recovery action, so as to ensure that the push rod pushes the ejector pin assembly 8 and the ejector rod 9 to move synchronously. The telescopic drive member is preferably a cylinder or a hydraulic cylinder. When the push rod moves under the action of the telescopic drive member, the ejector pin assembly 8 can accurately penetrate the core 41 to achieve accurate ejection of the keycap, and the ejector rod 9 slides to the injection channel 42 to eject the waste in the channel synchronously to prevent uneven stress of the keycap.

[0036] refer to Figure 1 In one embodiment, it further includes a plurality of positioning components 16, wherein the positioning components 16 include a positioning concave block 161 and a positioning convex block 162, wherein the positioning concave block 161 is fixedly connected to the front mold base 1, and the positioning convex block 162 is fixedly connected to the rear mold base 2; The positioning concave block 161 is provided with a positioning groove, and the positioning convex block 162 is provided with a positioning protrusion matched with the positioning groove. When the positioning protrusion is inserted into the positioning groove, one end face of the rear mold core 4 close to the front mold core 3 presses against the front mold core 3.

[0037] The cooperation of the positioning assembly 16 ensures that the front and rear mold bases 2 are precisely aligned during the injection molding process, thereby ensuring the accuracy of keycap molding. The cooperation design of the positioning concave block 161 and the positioning convex block 162 not only improves the positioning accuracy of the mold, but also during the injection molding process, due to the close cooperation between the positioning convex block and the positioning groove, it can effectively prevent the mold base displacement caused by the injection molding pressure, thereby ensuring the consistency of the size and shape of the keycap.

[0038] refer to Figure 8 In one embodiment, a concave portion 63 is provided on one end surface of the casting member 6 close to the front mold core 3, and the shape of the concave portion 63 matches the injection channel 42; The pouring gate 61 is disposed on two opposite sides of the recessed portion 63 , with the outlet of the pouring gate 61 facing the recessed portion 63 , and one end of the pouring gate 61 away from the recessed portion 63 is embedded in the core 41 and flush with a side of the core 41 close to the recessed portion 63 .

[0039] One end of the pouring gate 61 away from the recessed portion 63 is embedded in the core 41 and is flush with the side of the core 41 close to the recessed portion 63, that is, the pouring gate 61 also constitutes a part of the core 41. Before the molten plastic is injected into the cavity 31 through the pouring gate 61, the molten plastic first fills the recessed portion 63. Since the shape of the recessed portion 63 matches the injection channel 42, a complete flow channel for the molten plastic is formed, which helps to reduce the shear stress of the plastic during the flow process, thereby reducing the defects that may occur in the keycap molding process, thereby producing high-quality thin keycaps.

[0040] In another embodiment, a plurality of exhaust channels are further provided on the surface of the injection channel 42, and these exhaust channels are in contact with the recessed portion 63 to ensure that during the injection molding process, excess gas can flow into the exhaust channels to reduce the internal stress generated by the plastic during cooling, thereby avoiding warping, material shortage or deformation of the keycaps during subsequent use, thereby ensuring that the keycaps have good mechanical properties and durability while maintaining a light and thin design.

[0041] In one embodiment, a drainage portion is provided on one side of the pouring port 61 facing the recessed portion 63, and the drainage portion is provided at one end of the core 41 close to the rear mold core 4, so that after the cavity 31 is matched with the core 41, the injection fluid is dispersed along the drainage portion to fill the cavity 31.

[0042] The shape of the drainage portion can guide the molten plastic to flow evenly to each corner after the cavity 31 and the core 41 are combined, thereby avoiding bubbles or underfilling of the plastic during the filling process, and can effectively improve the molding quality of the keycap.

[0043] refer to Figure 3 and Fig. 9 In one embodiment, a liquid storage tank 17 is provided at one end of the front mold base 1 away from the rear mold base 2, and an end surface of the liquid storage tank 17 away from the front mold base 1 is fixedly connected to the fixed base 10, and a receiving chamber is provided in the liquid storage tank 17, and a liquid storage box 18 is installed in the receiving chamber, and a heating pipe is arranged around the liquid storage box 18; The end of the liquid storage box 18 close to the front mold base 1 is fixedly connected to the injection pipe 5, and the injection pipe 5 penetrates the liquid storage tank 17 and the front mold base 1. The end of the liquid injection pipe 5 away from the liquid storage box 18 is connected to the injection channel 42. The end of the liquid storage box 18 away from the front mold base 1 is fixedly connected to the feed pipe 19, and the feed pipe 19 penetrates to the side of the fixed base 10 away from the liquid storage box 18.

[0044] The plastic raw material in the liquid storage box 18 is heated to a molten state by the heating tube, and then transported to the liquid injection channel 42 through the liquid injection tube 5. The feed pipe 19 is used to replenish the plastic raw material in the liquid storage box 18 to ensure the continuous supply of raw materials during the injection molding process. The entire system ensures the fluidity of the plastic raw material by precisely controlling the temperature and pressure, thereby making the keycap molding process more stable and efficient. In addition, the liquid storage tank 17 also takes into account the problems of thermal expansion and cooling contraction. The accommodating chamber set in the liquid storage tank 17 has a large gap with the liquid storage box 18, which ensures the stability and reliability of the entire injection molding device during long-term operation.

[0045] refer to Figure 1 and Figure 2 In one embodiment, it also includes a first cooling pipe 20 and a second cooling pipe 21, the first cooling pipe 20 is inserted through the front mold base 1 and the front mold core 3, the second cooling pipe 21 is inserted through the rear mold base 2 and the rear mold core 4, and the end of the first cooling pipe 20 and the end of the second cooling pipe 21 are respectively connected with pipe joints.

[0046] The first cooling pipe 20 and the second cooling pipe 21 are provided to effectively control the temperature of the mold base and the mold core, and ensure the cooling rate and uniformity of the keycap during the injection molding process. Through the pipe joint, cooling water or cooling medium can be easily introduced into the cooling pipe, so as to achieve precise temperature control of the mold base and the mold core. The design of this cooling system helps to improve the quality of the keycap and reduce molding defects such as deformation and stress concentration. At the same time, the reasonable layout of the cooling pipe also takes into account the cooling efficiency and space utilization to meet the special molding requirements of thin and light keycaps.

[0047] In another embodiment, a temperature control system is also included, which monitors the temperature of the mold base and the mold core in real time through a temperature sensor, and adjusts the flow and temperature of the cooling water or cooling medium through a control unit. Such closed-loop control ensures temperature stability throughout the injection molding process, thereby further optimizing the molding quality of the keycap. The design of the temperature control system enables the injection molding device to adapt to the production requirements of keycaps of different materials and different thicknesses, thereby improving the versatility and production efficiency of the equipment.

[0048] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An injection molding device for a thin keycap, characterized in that: The invention comprises a front mold base (1) and a rear mold base (2) which moves relative to the front mold base (1); a front mold core (3) is embedded in one end face of the front mold base (1) close to the rear mold base (2); a rear mold core (4) is embedded in one end face of the rear mold base (2) close to the front mold base (1); a plurality of mold cores (41) and liquid injection channels (42) are arranged on one end face of the rear mold core (4) close to the front mold core (3); the front mold core (3) is provided with a mold cavity (31) corresponding to the mold core (41) and a liquid injection pipe (5) corresponding to the liquid injection channel (42); a plurality of castings (6) are inserted in the rear mold core (4); the castings (6) are provided with a horn-shaped pouring port (61); and the liquid injection channel (42) is connected to the mold core (41) through the pouring port (61); The end surface of the rear mold base (2) away from the front mold base (1) is movably connected to a movable seat (7), and the end surface of the movable seat (7) facing the rear mold base (2) is provided with a plurality of ejector pin assemblies (8) and ejector rods (9). The ejector pin assemblies (8) are inserted into the rear mold core (4), and the end of the ejector pin assemblies (8) away from the movable seat (7) penetrates the core (41). The casting (6) is provided with an ejector through hole (62) for the ejector rod (9) to pass through, the ejector through hole (62) is communicated with the injection channel (42), and the ejector rod (9) is slidably connected to the ejector through hole (62).

2. The injection molding device for a thin keycap according to claim 1, characterized in that: The ejector pin assembly (8) comprises a plurality of inclined ejector pins (81) and a flat ejector pin (82), wherein the inclined ejector pin (81) comprises a fixed pin rod (811) and a swing pin rod (812), wherein the fixed pin rod (811) is fixedly connected to the movable seat (7), an end of the fixed pin rod (811) away from the movable seat (7) is provided with a movable protrusion, and the swing pin rod (812) is movably connected to the movable protrusion via a movable groove, and an end of the swing pin rod (812) away from the movable groove is provided with a groove for keycap molding and penetrates the core (41); The flat top pin (82) is fixedly connected to the movable seat (7), and one end of the flat top pin (82) away from the movable seat (7) penetrates the core (41), wherein when the movable seat (7) is stationary, one end of the swing pin rod (812) away from the movable groove and one end of the flat top pin (82) away from the movable seat (7) are respectively flush with the end surface of the core (41).

3. The injection molding device for a thin keycap according to claim 1, characterized in that: A fixed seat (10) is arranged at one end of the front mold base (1) away from the rear mold base (2); a plurality of guide posts (11) are arranged at one end of the fixed seat (10) close to the front mold base (1); an end of the guide post (11) away from the fixed seat (10) is fixedly connected to a connecting seat (12); the guide posts (11) penetrate the front mold base (1) and the rear mold base (2) respectively; the front mold base (1) is provided with a first guide hole for the guide posts (11) to pass through; the rear mold base (2) is provided with a second guide hole for the guide posts (11) to pass through; the rear mold base (2) is slidably connected to the guide rod via the second guide hole.

4. The injection molding device for a thin keycap according to claim 3, characterized in that: A limiting column (13) is provided in the movable seat (7), and two ends of the limiting column (13) are respectively fixedly connected to the rear mold seat (2) and the connecting seat (12); A plurality of telescopic columns (14) are arranged at one end of the movable seat (7) close to the rear die seat (2); an end of the telescopic column (14) away from the movable seat (7) is inserted into the rear die seat (2) and fixedly connected to the rear die seat (2); and an elastic member (15) is sleeved on the outer side of the telescopic column (14).

5. The injection molding device for a thin keycap according to claim 4, characterized in that: An end surface of the connecting seat (12) away from the movable seat (7) is fixedly connected to the telescopic end of the telescopic driving member, and the telescopic driving member is used to drive the connecting seat (12) to drive the rear mold seat (2) to move in the direction of the front mold seat (1); The connecting seat (12) is provided with an avoidance hole, and the avoidance hole is slidably connected to a push rod, one end of the push rod is fixedly connected to the movable seat (7), and when the telescopic driving member drives the rear mold seat (2) to move in a direction away from the front mold seat (1), the end of the push rod away from the movable seat (7) abuts against the telescopic driving member to push the movable seat (7) so that the ejector pin assembly (8) penetrates the core (41) and the ejector rod (9) slides to the injection channel (42).

6. The injection molding device for a thin keycap according to claim 1, characterized in that: It also includes a plurality of positioning components (16), wherein the positioning components (16) include a positioning concave block (161) and a positioning convex block (162), wherein the positioning concave block (161) is fixedly connected to the front mold base (1), and the positioning convex block (162) is fixedly connected to the rear mold base (2); The positioning concave block (161) is provided with a positioning groove, and the positioning convex block (162) is provided with a positioning protrusion that matches the positioning groove. When the positioning protrusion is inserted into the positioning groove, an end surface of the rear mold core (4) close to the front mold core (3) presses against the front mold core (3).

7. The injection molding device for a thin keycap according to claim 1, characterized in that: A recessed portion (63) is provided on one end surface of the casting piece (6) close to the front mold core (3), and the shape of the recessed portion (63) matches the injection channel (42); The pouring port (61) is arranged on two opposite sides of the recessed portion (63), the outlet of the pouring port (61) faces the recessed portion (63), and one end of the pouring port (61) away from the recessed portion (63) is embedded in the core (41) and is flush with a side of the core (41) close to the recessed portion (63).

8. The injection molding device for a thin keycap according to claim 7, characterized in that: A drainage portion is provided on one side of the pouring port (61) facing the recessed portion (63), and the drainage portion is provided at one end of the core (41) close to the rear mold core (4), so that after the cavity (31) and the core (41) are matched, the injection fluid is dispersed along the drainage portion to fill the cavity (31).

9. The injection molding device for a thin keycap according to claim 3, characterized in that: A liquid storage tank (17) is arranged at one end of the front mold base (1) away from the rear mold base (2); an end surface of the liquid storage tank (17) away from the front mold base (1) is fixedly connected to the fixed base (10); a receiving chamber is arranged in the liquid storage tank (17); a liquid storage box (18) is installed in the receiving chamber; a heating tube is arranged around the liquid storage box (18); The end of the liquid storage box (18) close to the front mold base (1) is fixedly connected to the injection pipe (5), the injection pipe (5) penetrates the liquid storage bin (17) and the front mold base (1), the end of the injection pipe (5) away from the liquid storage box (18) is connected to the injection channel (42), and the end of the liquid storage box (18) away from the front mold base (1) is fixedly connected to the feed pipe (19), and the feed pipe (19) penetrates to the side of the fixed base (10) away from the liquid storage box (18).

10. The injection molding device for a thin keycap according to claim 1, characterized in that: It also comprises a first cooling pipe (20) and a second cooling pipe (21), wherein the first cooling pipe (20) penetrates the front mold base (1) and the front mold core (3), and the second cooling pipe (21) penetrates the rear mold base (2) and the rear mold core (4), and the end of the first cooling pipe (20) and the end of the second cooling pipe (21) are respectively connected to pipe joints.

Images