An injection mold for overmolding a remote control housing part

Abstract

The utility model relates to injection moulding technology field, concretely relates to a kind of injection mould for the secondary encapsulation of remote controller shell parts. Including: forming assembly, template assembly, mould frame assembly, ejection assembly and guide assembly.Forming assembly includes fixed mould and movable mould, movable mould is equipped with core, and the positioning protrusion matched with the positioning groove of hard glue framework is equipped on core, and the accurate positioning and circumferential anti-rotation of hard glue framework are realized.Sloping ejection mechanism includes sloping ejection block, its forming end participates in the forming of soft glue cladding layer, driving end cooperates with the insert cutter face on fixed mould, and complete airtight injection cavity is formed when mould is closed.The mould effectively solves the problem of inaccurate positioning of hard glue framework and difficult demoulding of complex structure, ensures that soft glue cladding layer is coplanar with framework surface at button hole, forms smooth button without step, improves product forming quality and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to an injection mold for secondary overmolding of remote control shell parts. Background Technology

[0002] With the widespread use of consumer electronics, the casings of devices such as remote controls not only need to have structural strength, but also need to provide a comfortable feel, anti-slip properties, and an aesthetically pleasing appearance. For this reason, a secondary injection molding (overmolding) process is often used, where a layer of soft rubber or plastic is injected onto a pre-formed rigid plastic frame.

[0003] In existing technologies, achieving secondary overmolding injection molding for such parts faces numerous challenges. First, the positioning of the hard plastic skeleton within the mold is crucial. Inaccurate or unstable positioning can lead to uneven thickness of the soft plastic overmolding layer, and even overflow between the skeleton and the mold, severely impacting product quality.

[0004] Secondly, to achieve the special internal structure of the product, molds often require lateral core-pulling mechanisms such as angled ejectors. However, in secondary overmolding molds, the design of the angled ejector mechanism is more complex. On the one hand, the angled ejector block may participate in the molding of the soft rubber portion, and the shape and precision of its molding end directly affect the product quality. On the other hand, during mold closing, it is essential to ensure a tight fit between the angled ejector block and the insert face on the fixed mold side to form a sealed cavity and prevent flash. Simultaneously, after mold opening, the angled ejector mechanism needs to be able to demold smoothly and accurately reset in preparation for the next injection molding. Utility Model Content

[0005] (a) Technical problems to be solved In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an injection mold for secondary overmolding of remote control shell parts, so as to solve the problems of difficult demolding of complex structures and positioning accuracy of hard plastic skeleton when injection molding remote control parts with secondary overmolding in the prior art.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides an injection mold for secondary overmolding of remote control housing parts, comprising: The remote control housing includes a molding assembly, a template assembly, a mold frame assembly, an ejection assembly, and a guide assembly. The housing part comprises a hard plastic skeleton and a soft plastic covering layer. The molding assembly includes a fixed mold and a moving mold. A core is formed on the moving mold, and a positioning structure matching the hard plastic skeleton is provided on the core. A cavity is provided on the fixed mold. The shape of the injection cavity formed after the moving mold and the fixed mold are closed corresponds to the soft plastic covering layer, forming a parting surface. The injection mold is used to cover the soft plastic covering layer onto the hard plastic skeleton. The rigid plastic skeleton is semi-cylindrical, including a circular end face and a cylindrical side face; several side button holes are formed on the cylindrical side face, and one end button hole is formed on the circular end face; the soft plastic coating layer is formed inside the rigid plastic skeleton by the injection mold, and the soft plastic coating layer is coplanar with the outer surface of the rigid plastic skeleton at the side button holes and the main button hole, forming a smooth button without step differences; a square positioning groove is also formed on the cylindrical side face; positioning protrusions matching the shape of the positioning groove are formed on the core; The template assembly includes a movable template and a fixed template; the template frame assembly includes a movable mold fixing plate and a fixed mold fixing plate; the fixed mold is fixedly disposed in the fixed template, and the movable mold is fixedly disposed in the fixed template; The molding assembly further includes an inclined ejector mechanism, which includes an inclined ejector block. The inclined ejector block is slidably disposed on the moving template and the moving mold. The moving template and the moving mold are provided with sliding grooves that match the inclined ejector block. The inclined ejector block includes a molding end and a driving end. The molding end faces the inside of the moving mold to form the soft rubber coating layer when the mold is closed. The driving end is located on the side away from the moving mold. The driving end includes a sliding contact surface. The fixed mold has a cutting surface that matches the sliding contact surface, so that a complete and sealed injection cavity is formed when the mold is closed.

[0007] Preferably, the inclined ejector mechanism further includes an inclined guide rod and an elastic element. The inclined guide rod is fixed obliquely inside the fixed template, and its axis is parallel to the sliding contact surface of the inclined ejector block. The inclined ejector block has an inclined guide hole that matches the inclined guide rod, and the inclined guide rod passes through the inclined guide hole to form a sliding pair. One end of the elastic element abuts against the inclined ejector block, and the other end abuts against the moving mold, so as to drive the inclined ejector block to reset after molding. The ejection assembly includes a material demolding mechanism and a sprue demolding mechanism. The sprue demolding mechanism includes a sprue plate and a limiting mechanism. The sprue plate is disposed between the fixed mold plate and the fixed mold fixing plate. The limiting mechanism includes a pull rod, a plug screw, and a limiting countersunk hole. The plug screw is fixedly disposed on the sprue plate. The fixed mold fixing plate is provided with the limiting countersunk hole corresponding to the plug screw. The depth of the limiting countersunk hole is greater than the height of the screw head of the plug screw. In the mold closed state, there is a gap between the screw head and the bottom of the limiting countersunk hole. The pull rod includes a fixed end and a pulling end. The fixed end is fixed to the sprue plate, and the pulling end passes through the clearance holes opened on the moving template and the moving template fixing plate in sequence. The fixed template has a pulling hole that matches the pulling end. The mold frame assembly also includes a pair of support blocks, with the two ends of the support blocks respectively fastened to the moving mold plate and the moving mold fixing plate, so that a receiving space is formed between the moving mold plate and the moving mold fixing plate to accommodate the material demolding mechanism; The material demolding mechanism includes a first ejector pin fixing plate, a second ejector pin fixing plate, and several straight ejector rods. The first ejector pin fixing plate is disposed between the moving mold plate and the moving mold fixing plate, and has several matching countersunk holes. The fixing end is disposed in the countersunk holes. The second ejector pin fixing plate is located between the first ejector pin fixing plate and the moving mold fixing plate. The first ejector pin fixing plate and the second ejector pin fixing plate are stacked parallel to each other to fix the straight ejector rods. The molding assembly also includes a nozzle, which is connected to the injection nozzle of the injection molding machine to inject glue into the cavity formed by the fixed mold and the moving mold. The fixed mold has a first injection hole, and the sprue plate, the fixed template plate and the fixed mold fixing plate have a second injection hole, a third injection hole and a fourth injection hole that match the first injection hole. The nozzle passes through the first injection hole, the second injection hole and the third injection hole. The guiding assembly includes several first guiding mechanisms. Each first guiding mechanism includes a guide post and a guide sleeve sleeved on the guide post. The guide post is connected to a moving template, and the guide sleeve is connected to a fixed template. The guide post is slidably disposed within the guide sleeve along the direction of the guide sleeve.

[0008] Preferably, the ejection assembly further includes several second guide mechanisms, each of which includes a pair of central support edges and a central support rod. The central support rod is slidably disposed outside the central support edge along the direction of the central support edge. The first ejector pin fixing plate and the second ejector pin fixing plate are provided with matching central support rod fixing through holes to fix the central support rod. One end of the central support edge is disposed on the moving mold fixing plate, and the other end is disposed on the moving mold plate. The moving mold fixing plate is also provided with several through holes so that the pushing mechanism on the injection molding machine can push the ejection component.

[0009] Preferably, the ejection assembly further includes a reset assembly, which includes several reset elastic elements and elastic element limiting rods that match the reset elastic elements. One end of the reset elastic element abuts against the first ejector pin fixing plate, and the other end abuts against the moving template. An elastic element limiting rod passes through the central axis of the reset elastic element. The first ejector pin fixing plate has a countersunk hole for fixing the elastic element limiting rod, and the moving template has a sliding through hole for the elastic element limiting rod to slide.

[0010] Preferably, the ejection assembly further includes a resin opener / closer, which is fixedly mounted on the moving template. The fixed template has a first locking hole corresponding to the resin opener / closer, so that the fixed template and the moving template remain locked during the initial mold opening.

[0011] Preferably, the guide assembly includes four of the first guide mechanisms, which are centrally and symmetrically distributed around the fixed template.

[0012] Preferably, the mold frame assembly further includes several support columns, which are disposed between the moving mold plate and the moving mold fixing plate, with one end connected to the moving mold plate and the other end connected to the moving mold fixing plate. The first ejector pin fixing plate and the second ejector pin fixing plate are provided with clearance holes for the support columns to pass through.

[0013] Preferably, the ejection assembly further includes several ejection limiting blocks and a waste nail, wherein the ejection limiting blocks are disposed on the first ejector pin fixing plate and face the moving template; The garbage nail is disposed on the second ejector pin fixing plate and faces the moving mold fixing plate.

[0014] Preferably, it also includes a cooling assembly, which includes cooling water channels formed in the fixed template, the moving template, the moving mold, and the fixed mold. The starting point of the cooling water channel is connected to a cooling water inlet pipe, and the ending point is connected to a cooling water outlet pipe.

[0015] Preferably, it also includes a locking module, which is disposed on the outer surface of the fixed template and the moving template. The fixed template and the moving template are respectively provided with threaded holes, and the locking module is provided with a through hole corresponding to the threaded hole. A screw passes through the through hole to lock the fixed template and the moving template.

[0016] (III) Beneficial Effects In this invention, a secondary overmolding injection mold for remote control housing parts utilizes a positioning protrusion on the core that matches the square positioning groove of the hard plastic skeleton. This achieves precise positioning and circumferential anti-rotation of the hard plastic skeleton within the mold. Simultaneously, a slanted ejector mechanism, including a slanted ejector block, is used, with its molding end contributing to the injection cavity and its driving end sealing against the fixed mold insert surface. This design effectively prevents displacement of the hard plastic skeleton during injection molding, ensuring that the soft plastic overmolding layer is precisely coplanar with the skeleton surface at the button hole, forming a smooth button without step differences. Furthermore, it allows for easy demolding of soft plastic products with internal undercuts, significantly improving product molding quality and production efficiency. Attached Figure Description

[0017] Figure 1This is a front view schematic diagram of an injection mold for secondary overmolding of remote control shell parts according to the present invention; Figure 2 for Figure 1 A left-side view of the injection mold used for secondary overmolding of remote control housing parts; Figure 3 for Figure 1 A top view of the injection mold used for secondary overmolding of remote control housing parts; Figure 4 for Figure 2 Schematic cross-section view along the middle AA; Figure 5 for Figure 2 Schematic sectional view of the middle edge BB; Figure 6 for Figure 3 Cross-sectional view of the center line CC; Figure 7 for Figure 3 Schematic cross-section of the middle DD; Figure 8 for Figure 3 Cross-sectional view of the middle EE; Figure 9 for Figure 1 An exploded 3D view of the injection mold used for secondary overmolding of remote control housing parts; Figure 10 A three-dimensional schematic diagram of the remote control casing parts; Figure 11 This is a three-dimensional exploded view of the remote control casing parts.

[0018] [Explanation of Labels in the Attached Image] 1: Fixed mold plate; 2: Sprue plate; 3: Fixed template; 4: Moving template; 5: Support block; 6: Moving mold fixing plate; 7: First ejector pin fixing plate; 8: Second ejector pin fixing plate; 9: Nozzle; 10: Angled ejector block; 11: Angled guide rod; 12: Reset assembly; 121: Reset elastic element; 122: Elastic element limit rod; 13: Second guiding mechanism; 131: Middle support; 132: Middle support side; 14: Support column; 15: Garbage nail; 16: First guiding mechanism; 161: Guide sleeve; 162: Guide post; 17: Pull rod; 18: Plug screw; 19: Locking module; 20: Resin opener / closer; 21: Push out the limit block; 100: Fixed mold; 200: Moving mold; 300: Remote control housing parts; 301: Positioning groove; 302: Hard plastic skeleton; 303: Soft plastic covering layer. Detailed Implementation

[0019] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0021] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; "connection" can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] See Figures 1 to 11 This utility model provides an injection mold for secondary overmolding of a remote control housing part 300, comprising: The system comprises molding components, template components, mold frame components, ejection components, and guide components; the remote control housing part 300 includes a hard plastic skeleton 302 and a soft plastic covering layer 303; the molding component includes a fixed mold 100 and a moving mold 200, the moving mold 200 having a core formed thereon, the core having a positioning structure matching the hard plastic skeleton 302, the fixed mold 100 having a cavity, the injection cavity formed after the moving mold 200 and the fixed mold 100 are closed having a shape corresponding to the soft plastic covering layer 303 and forming a parting surface; the injection mold is used to cover the soft plastic covering layer 303 onto the hard plastic skeleton 302; The rigid plastic skeleton 302 is semi-cylindrical, including a circular end face and a cylindrical side face; several side button holes are formed on the cylindrical side face, and one end button hole is formed on the circular end face; the soft plastic covering layer 303 is formed inside the rigid plastic skeleton 302 by the injection mold, and the soft plastic covering layer 303 is coplanar with the outer surface of the rigid plastic skeleton 302 at the side button holes and the main button hole, forming a smooth button without step difference; a square positioning groove 301 is also formed on the cylindrical side face; a positioning protrusion matching the shape of the positioning groove 301 is formed on the core; The template assembly includes a movable template 4 and a fixed template 3; the template frame assembly includes a movable mold fixing plate 6 and a fixed mold fixing plate 1; the fixed mold 100 is fixedly disposed in the fixed template 3, and the movable mold 200 is fixedly disposed in the fixed template 3; The molding assembly further includes an inclined ejector mechanism, which includes an inclined ejector block 10. The inclined ejector block 10 is slidably disposed on the moving template 4 and the moving mold 200. The moving template 4 and the moving mold 200 are provided with sliding grooves that match the inclined ejector block 10. The inclined ejector block 10 includes a molding end and a driving end. The molding end faces the interior of the moving mold 200 to form the soft rubber coating layer 303 when the mold is closed. The driving end is located on the side away from the moving mold 200. The driving end includes a sliding contact surface. The fixed mold 100 has a cutting surface that matches the sliding contact surface, so that a complete and sealed injection cavity is formed when the mold is closed. Its molding end extends into the cavity when the mold is closed, and directly participates in the molding of the side button hole in the soft rubber covering layer 303.

[0024] After the mold is opened, the moving mold 200 and the fixed mold 100 of the molding component are exposed. The positioning groove 301 of the hard plastic skeleton 302 is engaged with the positioning protrusion by the worker or robot. At the same time, the moving mold 200 is partially retracted, so that the inclined ejector block 10 moves along the sliding groove on the moving template 4 and the moving mold 200 under the action of the injection molding machine.

[0025] The sliding contact surface of the drive end fits tightly against the insert surface on the fixed mold 100 during mold closing. This design ensures that even with the introduction of the movable ejector block 10 into the mold, the entire injection cavity remains intact and sealed, effectively preventing high-pressure soft glue from overflowing from the gaps and generating flash, thus guaranteeing product quality.

[0026] Preferably, the inclined ejector mechanism further includes an inclined guide rod 11 and an elastic element. The inclined guide rod 11 is inclinedly fixed inside the fixed template 3, and its rod axis is parallel to the sliding contact surface of the inclined ejector block 10. The inclined ejector block 10 has an inclined guide hole that matches the inclined guide rod 11. The inclined guide rod 11 passes through the inclined guide hole and forms a sliding pair. One end of the elastic element abuts against the inclined ejector block 10, and the other end abuts against the moving mold 200, so as to drive the inclined ejector block 10 to reset after molding. The ejection assembly includes a material demolding mechanism and a sprue demolding mechanism. The sprue demolding mechanism includes a sprue plate 2 and a limiting mechanism. The sprue plate 2 is disposed between the fixed mold plate 3 and the fixed mold fixing plate 1. The limiting mechanism includes a pull rod 17, a plug screw 18, and a limiting countersunk hole. The plug screw 18 is fixedly disposed on the sprue plate 2. The fixed mold fixing plate 1 is provided with the limiting countersunk hole corresponding to the plug screw 18. The depth of the limiting countersunk hole is greater than the height of the screw head of the plug screw 18. In the mold closing state, there is a gap between the screw head and the bottom of the limiting countersunk hole. The pull rod 17 includes a fixed end and a pulling end. The fixed end is fixed to the sprue plate 2, and the pulling end passes through the clearance holes opened on the moving template 4 and the moving template fixing plate 6 in sequence. The fixed template 3 is provided with a pulling hole that matches the pulling end. The mold frame assembly also includes a pair of support blocks 5, with the two ends of the support blocks 5 respectively fastened to the moving template 4 and the moving mold fixing plate 6, so that a receiving space is formed between the moving template 4 and the moving mold fixing plate 6 to accommodate the material demolding mechanism; The material demolding mechanism includes a first ejector pin fixing plate 7, a second ejector pin fixing plate 8, and several straight ejector rods. The first ejector pin fixing plate 7 is disposed between the moving mold plate 4 and the moving mold fixing plate 6, and has several matching countersunk holes. The fixing end is disposed in the countersunk holes. The second ejector pin fixing plate 8 is located between the first ejector pin fixing plate 7 and the moving mold fixing plate 6. The first ejector pin fixing plate 7 and the second ejector pin fixing plate 8 are stacked parallel to each other to fix the straight ejector rods. The molding assembly also includes a nozzle 9, which is connected to the injection nozzle of the injection molding machine to inject glue into the cavity formed by the fixed mold 100 and the moving mold 200. The fixed mold 100 is provided with a first injection hole, and the sprue plate 2, the fixed mold plate 3 and the fixed mold fixing plate 1 are provided with a second injection hole, a third injection hole and a fourth injection hole that match the first injection hole. The nozzle 9 passes through the first injection hole, the second injection hole and the third injection hole. The guiding assembly includes several first guiding mechanisms 16. Each first guiding mechanism 16 includes a guide post 162 and a guide sleeve 161 sleeved on the guide post 162. The guide post 162 is connected to the moving template 4, and the guide sleeve 161 is connected to the fixed template 3. The guide post 162 is slidably arranged within the guide sleeve 161 along the direction of the guide sleeve 161.

[0027] During mold opening, the fixed mold plate 3 separates from the moving mold plate 4. The inclined guide rod 11 moves relative to the inclined guide hole on the inclined ejector block 10. Due to the angle, this relative motion is converted into a lateral thrust on the inclined ejector block 10, driving it to complete the demolding action. The elastic element provides the reset power. When the mold closes, the inclined guide rod 11 guides the inclined ejector block 10 back to its original position, and the elastic element is compressed. After the mold opens and ejects, the energy stored in the elastic element is released, ensuring that the inclined ejector block 10 can accurately reset before the next mold closing, thus ensuring continuous production.

[0028] In the mold-closed state, the screw head of the plug screw 18 is located within the limiting countersunk hole of the fixed mold plate 1, with a gap present. At this time, the sprue plate 2 is pressed tightly. During mold opening, the moving mold 200 partially retracts, pulling the sprue plate 2 and the fixed mold plate 3 apart first via the pull rod 17. Since the fixed mold plate 1 is equipped with a pull pin, the pull pin can pull the sprue material out of the runner. When the screw head of the plug screw 18 moves to contact the bottom of the limiting countersunk hole, the sprue plate 2 separates from the fixed mold plate 1, and the sprue plate 2 pushes out the sprue material, causing the sprue material to fall off automatically under gravity or auxiliary force. Then the moving mold plate 4 continues to retract, realizing the separation of the fixed mold plate 3 and the moving mold plate 4. At the same time, the ejector rod ejects the remote control housing part 300, completing the injection molding.

[0029] Preferably, the ejection assembly further includes several second guide mechanisms 13, each second guide mechanism 13 including a pair of central support edges 132 and central support rods 131. The central support rods 131 are slidably disposed outside the central support edges 132 along the direction of the central support edges 132. The first ejector pin fixing plate 7 and the second ejector pin fixing plate 8 are provided with matching central support rod 131 fixing through holes to fix the central support rods 131. One end of the central support edge 132 is disposed on the moving mold fixing plate 6, and the other end is disposed on the moving mold plate 4. The moving mold fixing plate 6 is also provided with several through holes so that the pushing mechanism on the injection molding machine can push the ejection component.

[0030] Preferably, the ejection assembly further includes a reset assembly 12, which includes several reset elastic elements 121 and elastic element limiting rods 122 that match the reset elastic elements 121. One end of the reset elastic element 121 abuts against the first ejector pin fixing plate 7, and the other end abuts against the moving template 4. The elastic element limiting rod 122 passes through the central axis of the reset elastic element 121. The first ejector pin fixing plate 7 has a countersunk hole for fixing the elastic element limiting rod 122. The moving template 4 has a sliding through hole for the elastic element limiting rod 122 to slide. The reset elastic element 121 is a reset spring.

[0031] The elastic force of the return spring pushes the first ejector pin fixing plate 7 and the second ejector pin fixing plate 8 back to their original positions after ejection, and then completes the next injection molding action. The axis of the elastic element limit rod 122 coincides with the axis of the return elastic element 121, providing a stable axial constraint.

[0032] Preferably, the ejection assembly further includes a resin opener / closer 20, which is fixedly mounted on the moving template 4. The fixed template 3 has a locking hole corresponding to the resin opener / closer 20, so that the fixed template 3 and the moving template 4 remain locked during the initial mold opening.

[0033] The resin opener 20 is pressed into the locking hole. When the mold is opened, it generates a huge frictional force with the locking hole to achieve locking, so that the opening and closing of the sprue plate 2 precedes the opening and closing of the moving mold plate 4 and the fixed mold plate 3, thus avoiding interference.

[0034] Preferably, the guide assembly includes four of the first guide mechanisms 16, which are centrally and symmetrically distributed around the fixed template 3.

[0035] Four first guide mechanisms 16 are symmetrically distributed around the fixed template 3. The symmetrical layout makes the mold closing force uniform, effectively resists the template misalignment caused by eccentric load, and improves the molding accuracy of the upper and lower box covers.

[0036] Preferably, the mold frame assembly further includes several support columns 14, which are disposed between the moving mold plate 4 and the moving mold fixing plate 6. One end of the support column 14 is connected to the moving mold plate 4, and the other end is connected to the moving mold fixing plate 6. The first ejector pin fixing plate 7 and the second ejector pin fixing plate 8 are provided with clearance holes for the support columns 14 to pass through.

[0037] The ejector pin fixing plate needs to move smoothly and steadily back and forth during ejection. The presence of the support column 14 stabilizes the entire frame structure of the moving mold 200 side, reducing the deformation of the moving mold plate 4 under pressure. This overall increase in rigidity makes the movement trajectory of the first ejector pin fixing plate 7 and the second ejector pin fixing plate 8 more stable when guided by the center support edge 132 and the guide sleeve 161. They are less likely to be affected by the deformation of the mold plate and thus less prone to jamming, tilting, or additional friction, improving the reliability and lifespan of ejection.

[0038] Preferably, the ejection assembly further includes several ejection limiting blocks 21 and garbage nails 15. The ejection limiting blocks 21 are disposed on the first ejector pin fixing plate 7 and face the moving template 4. The garbage nail 15 is disposed on the second ejector pin fixing plate 8 and faces the moving mold fixing plate 6.

[0039] The debris pin 15 is a small support component that creates a small gap between the second ejector pin fixing plate 8 and the moving mold fixing plate 6. This allows any debris that accidentally falls into this area to be contained without hindering the complete reset of the second ejector pin fixing plate 8, thereby improving the reliability of mold operation. The ejection limit block 21 acts as a mechanical stop to precisely limit the maximum ejection stroke of the ejection assembly. This prevents the ejection assembly from over-ejecting, avoids the straight ejector pin from exceeding its stroke limit, and ensures the safety and consistency of the ejection action.

[0040] Preferably, it also includes a cooling assembly, which includes cooling water channels formed in the fixed mold plate 3, the moving mold plate 4, the moving mold 200 and the fixed mold 100. The starting point of the cooling water channel is connected to a cooling water inlet pipe and the ending point is connected to a cooling water outlet pipe.

[0041] The cooling water channels remove excess heat generated by the molten plastic in the mold, preventing defects in the irregularly shaped tee due to high temperatures. Simultaneously, it prevents heat from the high-temperature mold platen of the injection molding machine from being conducted to the mold, avoiding jamming of moving components in the mold due to thermal expansion, thus extending mold life. Furthermore, it maintains a balanced overall mold temperature, reducing flash or dimensional deviations caused by thermal deformation.

[0042] Preferably, it also includes a locking module 19, which is disposed on the outer surface of the fixed template 3 and the moving template 4. The fixed template 3 and the moving template 4 are respectively provided with threaded holes, and the locking module 19 is provided with a through hole corresponding to the threaded hole. A screw passes through the through hole to lock the fixed template 3 and the moving template 4.

[0043] The locking module 19 locks the moving template 4 and the fixed template 3 with screws when the mold is not in use, preventing injury to operators if the moving template 4 and the fixed template 3 come off during handling or when idle, and preventing a decrease in overall accuracy caused by the separation.

[0044] It should be understood that the above description of the specific embodiments of this utility model is only for illustrating the technical route and features of this utility model, and its purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. However, this utility model is not limited to the specific embodiments described above. All changes or modifications made within the scope of the claims of this utility model should be covered by the protection scope of this utility model.

Claims

1. An injection mold for secondary overmolding of a remote control housing part, comprising a molding assembly, a template assembly, a mold base assembly, an ejection assembly, and a guide assembly; the remote control housing part comprises a hard plastic skeleton and a soft plastic overmolding layer; the molding assembly comprises a fixed mold and a moving mold, the moving mold having a core formed thereon, the core having a positioning structure matching the hard plastic skeleton, the fixed mold having a cavity, the injection cavity formed after the moving mold and the fixed mold are closed having a shape corresponding to the soft plastic overmolding layer and forming a parting surface; characterized in that, The injection mold is used to cover the soft rubber coating layer onto the hard rubber skeleton; The rigid plastic skeleton is semi-cylindrical, including a circular end face and a cylindrical side face; several side button holes are formed on the cylindrical side face, and one end button hole is formed on the circular end face; the soft plastic coating layer is formed inside the rigid plastic skeleton by the injection mold, and the soft plastic coating layer is coplanar with the outer surface of the rigid plastic skeleton at the side button holes and the main button hole, forming a smooth button without step differences; a square positioning groove is also formed on the cylindrical side face; positioning protrusions matching the shape of the positioning groove are formed on the core; The template assembly includes a movable template and a fixed template; the template frame assembly includes a movable mold fixing plate and a fixed mold fixing plate; the fixed mold is fixedly disposed in the fixed template, and the movable mold is fixedly disposed in the fixed template; The molding assembly further includes an inclined ejector mechanism, which includes an inclined ejector block. The inclined ejector block is slidably disposed on the moving template and the moving mold. The moving template and the moving mold are provided with sliding grooves that match the inclined ejector block. The inclined ejector block includes a molding end and a driving end. The molding end faces the inside of the moving mold to form the soft rubber coating layer when the mold is closed. The driving end is located on the side away from the moving mold. The driving end includes a sliding contact surface. The fixed mold has a cutting surface that matches the sliding contact surface, so that a complete and sealed injection cavity is formed when the mold is closed.

2. The injection mold as described in claim 1, characterized in that, The inclined ejector mechanism also includes an inclined guide rod and an elastic element. The inclined guide rod is fixed at an angle inside the fixed template, and its axis is parallel to the sliding contact surface of the inclined ejector block. The inclined ejector block has an inclined guide hole that matches the inclined guide rod, and the inclined guide rod passes through the inclined guide hole to form a sliding pair. One end of the elastic element abuts against the inclined ejector block, and the other end abuts against the moving mold to drive the inclined ejector block to reset after molding. The ejection assembly includes a material demolding mechanism and a sprue demolding mechanism. The sprue demolding mechanism includes a sprue plate and a limiting mechanism. The sprue plate is disposed between the fixed mold plate and the fixed mold fixing plate. The limiting mechanism includes a pull rod, a plug screw, and a limiting countersunk hole. The plug screw is fixedly disposed on the sprue plate. The fixed mold fixing plate is provided with the limiting countersunk hole corresponding to the plug screw. The depth of the limiting countersunk hole is greater than the height of the screw head of the plug screw. In the mold closed state, there is a gap between the screw head and the bottom of the limiting countersunk hole. The pull rod includes a fixed end and a pulling end. The fixed end is fixed to the sprue plate, and the pulling end passes through the clearance holes opened on the moving template and the moving template fixing plate in sequence. The fixed template has a pulling hole that matches the pulling end. The mold frame assembly also includes a pair of support blocks, with the two ends of the support blocks respectively fastened to the moving mold plate and the moving mold fixing plate, so that a receiving space is formed between the moving mold plate and the moving mold fixing plate to accommodate the material demolding mechanism; The material demolding mechanism includes a first ejector pin fixing plate, a second ejector pin fixing plate, and several straight ejector rods. The first ejector pin fixing plate is disposed between the moving mold plate and the moving mold fixing plate, and has several matching countersunk holes. The fixing end is disposed in the countersunk holes. The second ejector pin fixing plate is located between the first ejector pin fixing plate and the moving mold fixing plate. The first ejector pin fixing plate and the second ejector pin fixing plate are stacked parallel to each other to fix the straight ejector rods. The molding assembly also includes a nozzle, which is connected to the injection nozzle of the injection molding machine to inject glue into the cavity formed by the fixed mold and the moving mold. The fixed mold has a first injection hole, and the sprue plate, the fixed template plate and the fixed mold fixing plate have a second injection hole, a third injection hole and a fourth injection hole that match the first injection hole. The nozzle passes through the first injection hole, the second injection hole and the third injection hole. The guiding assembly includes several first guiding mechanisms. Each first guiding mechanism includes a guide post and a guide sleeve sleeved on the guide post. The guide post is connected to a moving template, and the guide sleeve is connected to a fixed template. The guide post is slidably disposed within the guide sleeve along the direction of the guide sleeve.

3. The injection mold as described in claim 2, characterized in that, The ejection assembly further includes several second guide mechanisms. Each second guide mechanism includes a pair of central support edges and a central support rod. The central support rod is slidably disposed outside the central support edge along the direction of the central support edge. The first ejector pin fixing plate and the second ejector pin fixing plate are provided with matching central support rod fixing through holes to fix the central support rod. One end of the central support edge is disposed on the moving mold fixing plate, and the other end is disposed on the moving mold plate. The moving mold fixing plate is also provided with several through holes so that the pushing mechanism on the injection molding machine can push the ejection component.

4. The injection mold as described in claim 2, characterized in that, The ejection assembly further includes a reset assembly, which includes several reset elastic elements and elastic element limiting rods that match the reset elastic elements. One end of the reset elastic element abuts against the first ejector pin fixing plate, and the other end abuts against the moving template. An elastic element limiting rod passes through the central axis of the reset elastic element. The first ejector pin fixing plate has a countersunk hole for fixing the elastic element limiting rod. The moving template has a sliding through hole for the elastic element limiting rod to slide.

5. The injection mold as described in claim 2, characterized in that, The ejection assembly also includes a resin opener / closer, which is fixedly mounted on the moving template. The fixed template has a first locking hole corresponding to the resin opener / closer, so that the fixed template and the moving template remain locked during the initial mold opening.

6. The injection mold as described in claim 2, characterized in that, The guiding assembly includes four of the first guiding mechanisms, which are centrally and symmetrically distributed around the fixed template.

7. The injection mold as described in claim 2, characterized in that, The mold frame assembly also includes several support columns, which are disposed between the moving mold plate and the moving mold fixing plate. One end of the support column is connected to the moving mold plate, and the other end is connected to the moving mold fixing plate. The first ejector pin fixing plate and the second ejector pin fixing plate are provided with clearance holes for the support columns to pass through.

8. The injection mold as described in claim 2, characterized in that, The ejection assembly also includes several ejection limiting blocks and a waste nail. The ejection limiting blocks are disposed on the first ejector pin fixing plate and face the moving template. The garbage nail is disposed on the second ejector pin fixing plate and faces the moving mold fixing plate.

9. The injection mold as described in claim 1, characterized in that, It also includes a cooling assembly, which includes cooling water channels formed in the fixed template, the moving template, the moving mold and the fixed mold. The starting point of the cooling water channel is connected to a cooling water inlet pipe and the ending point is connected to a cooling water outlet pipe.

10. The injection mold as described in claim 1, characterized in that, It also includes a locking module, which is disposed on the outer surface of the fixed template and the moving template. The fixed template and the moving template are respectively provided with threaded holes. The locking module is provided with a through hole corresponding to the threaded hole. A screw passes through the through hole to lock the fixed template and the moving template.

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