An injection mold for secondary encapsulation of a bottle cap part

Abstract

The utility model relates to injection moulding technical field, concretely relates to a kind of injection mould for the secondary encapsulation of bottle cap parts;Including forming assembly, template assembly, mould frame assembly, ejection assembly and guiding component.Forming assembly includes fixed mould, movable mould and inclined ejector mechanism, movable mould is equipped with core print for the positioning prefabricated threaded connection part.The inclined ejector mechanism includes a pair of slidable inclined ejector block, its forming end participates in the parting surface of forming gripping portion when clamping, and is matched with the insert cutter surface on fixed mould by its driving end, ensure the cavity airtight.The utility model realizes the accurate positioning and reliable constraint to threaded connection part by the synergistic effect of core print and inclined ejector mechanism, so that mould has the functions of covering forming and smooth demoulding, effectively solve the demoulding problem of complex structure secondary encapsulation, improve production efficiency and product yield.

Description

Technical Field

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

[0002] In the bottle cap manufacturing process, to improve grip comfort and appearance, a secondary injection molding process is often used to cover the rigid threaded connection with a soft gripping part. This process requires the mold to accurately position and fix the pre-made threaded connection, and then inject molten rubber under high pressure.

[0003] Existing secondary overmolding injection molds have the following problems in practical applications: For the gripping part that is completely covered outside the insert, conventional ejection demolding methods are prone to damaging the soft rubber surface or causing demolding difficulties. In addition, the inclined ejector and other mechanisms introduced to achieve complex demolding still have deficiencies in terms of tightness of fit with the fixed mold, reliability of operation, and stability of reset, which affect production efficiency and mold life.

[0004] Therefore, there is an urgent need for a new type of injection mold for secondary overmolding of bottle cap parts to solve the above problems. 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 bottle cap parts, so as to solve the problems of complex structure, smooth demolding, and low production efficiency in the prior art.

[0006] (II) Technical Solution To achieve the above objectives, this utility model provides an injection mold for secondary overmolding of bottle cap parts, comprising: a molding assembly, a template assembly, a mold frame assembly, an ejection assembly, and a guide assembly; the bottle cap part includes a gripping portion and a threaded connection portion; 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 threaded connection portion is provided on the core; a cavity is provided on the fixed mold; a core is formed on the moving mold; the injection cavity formed after the moving mold and the fixed mold are closed corresponds to the shape of the gripping portion and forms a parting surface; the injection mold is used to overmold the gripping portion onto the threaded connection portion; wherein... The threaded connection is a hollow cylindrical shape, including an anchoring end and a threaded end that are arranged opposite each other in the axial direction of the threaded connection. The outer wall of the anchoring end is provided with several anchoring grooves for anchoring the gripping part, and the threaded end is provided with external threads. The gripping part is sleeved on the outer wall of the anchoring end through the anchoring grooves. The core matches the inner sidewall of the threaded connection to position the bottle cap part. 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 a slanted ejector mechanism, which comprises a pair of opposing slanted ejector blocks. The slanted ejector blocks are 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 slanted ejector blocks. Each slanted ejector block includes a molding end and a driving end. The molding end faces the interior of the moving mold so as to participate in forming the parting surface of the gripping part when the mold is closed. A reset member is also provided between the moving mold and the slanted ejector blocks to reset the slanted ejector blocks when the mold is opened. 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 forming end includes a top surface and a side surface; the top surface is coplanar with the parting surface of the moving mold, and a forming cavity is formed on the top surface, which cooperates with the fixed mold to jointly form the bottom surface of the gripping part; the side surface is semi-circular, and the side surfaces of a pair of inclined ejector blocks together form a complete circular cavity when the mold is closed, so as to accommodate and cover the threaded end of the threaded connection part, thereby restricting the axial movement of the threaded connection part.

[0008] The core includes a vertical core, which includes a fixed end fixed to the moving mold fixing plate. Its main body passes through the moving template and the moving mold in sequence and extends to the cavity. A locating key is provided on the side wall of the vertical core, extending along the axial direction of the vertical core. A keyway matching the locating key is provided on the inner wall of the threaded connection. A process groove matching the locating key is provided on the threaded end, so as to restrict the circumferential rotation of the threaded connection.

[0009] Preferably, the inclined ejector mechanism further includes an inclined guide post, which is inclinedly disposed in the fixed template and fixed inside the fixed template, with its axis parallel to the sliding contact surface of the inclined ejector block; the inclined ejector block has an inclined guide hole matching the inclined guide post, and the inclined guide post 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 reset component is a first reset spring, one end of which abuts against the inclined ejector block, and the other end abuts against the moving mold; 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 fixed mold plate and the fixed mold plate have a second injection hole and a third 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 moving mold has a sprue channel that matches the first injection hole. 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 ejection assembly; The ejection assembly includes a first ejector plate, a second ejector plate, a straight ejector rod, and a sleeve fitted onto the vertical core. The straight ejector rod and the sleeve each have an ejection end and a positioning end. A guide hole perpendicular to the parting surface and matching the ejection end is provided in the moving mold. The first ejector plate is disposed between the moving mold plate and the moving mold fixing plate, and has a countersunk hole matching the fixing end of the sleeve and the straight ejector rod. The fixing end of the sleeve and the straight ejector rod is disposed in the countersunk hole. The second ejector plate is located between the first ejector plate and the moving mold fixing plate. The first ejector plate and the second ejector plate are stacked parallel to each other to fix the sleeve and the straight ejector rod.

[0010] 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.

[0011] 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.

[0012] Preferably, the ejection assembly further includes a reset assembly, which includes several second reset springs and spring limiting rods that match the second reset springs. One end of the second reset spring abuts against the first ejector pin fixing plate, and the other end abuts against the moving template. A spring limiting rod passes through the central axis of the second reset spring. The first ejector pin fixing plate has a countersunk hole for fixing the spring limiting rod, and the moving template has a sliding through hole for the spring limiting rod to slide.

[0013] Preferably, the ejection assembly further includes several ejection limiting blocks, which are disposed on the first ejector pin fixing plate and face the moving template.

[0014] 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.

[0015] Preferably, the ejection assembly further includes a plurality of waste pins, which are disposed on the second ejector pin fixing plate and face the moving mold fixing plate.

[0016] 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.

[0017] Preferably, it also includes a safety switch, which is disposed on the moving mold fixing plate, and the second ejector pin fixing plate is provided with a safety switch activation block that matches the safety switch.

[0018] (III) Beneficial Effects In this invention, an injection mold for secondary overmolding of bottle cap parts effectively restricts the circumferential rotation of the threaded connection by the cooperation of the positioning key on the core and the keyway of the insert. At the same time, the axial movement is constrained by the circular cavity enclosed by a pair of inclined ejector blocks during mold closing, achieving precise positioning of the insert. The innovative inclined ejector mechanism has both molding and ejection functions. Combined with the ejection system composed of a straight ejector rod and a sleeve, it achieves smooth demolding of the overmolded structure. The inclined guide pillar and the insert face ensure the mold closing airtightness, the integrated cooling channel shortens the molding cycle, and the reset spring and safety switch ensure operational reliability. Thus, while solving the demolding problem of complex structures, it significantly improves production efficiency and product yield. Attached Figure Description

[0019] Figure 1This is a front view schematic diagram of an injection mold for secondary overmolding of bottle cap parts according to the present invention; Figure 2 for Figure 1 A schematic diagram from the right side of an injection mold used for secondary overmolding of bottle cap parts; Figure 3 for Figure 1 A top view schematic diagram of an injection mold used for secondary overmolding of bottle cap parts; Figure 4 for Figure 1 Schematic cross-section view along the middle AA; Figure 5 for Figure 1 Schematic sectional view of the middle edge BB; Figure 6 for Figure 1 Cross-sectional view of the center line CC; Figure 7 for Figure 2 Schematic cross-section of the middle DD; Figure 8 for Figure 1 An exploded three-dimensional diagram of an injection mold used for secondary overmolding of bottle cap parts; Figure 9 This is a three-dimensional schematic diagram of a bottle cap part in an injection mold for secondary overmolding of bottle cap parts according to the present invention. Figure 10 for Figure 9 An exploded 3D diagram of the bottle cap component.

[0020] [Explanation of Labels in the Attached Image] 1: Fixed mold fixing plate; 2: Fixed template; 3: Moving template; 4: Support block; 5: Moving mold fixing plate; 6: First ejector pin fixing plate; 7: Second ejector pin fixing plate; 8: Safety switch; 9: Safety switch activation block; 10: Lock module; 11: Cistern; 12: First guiding mechanism; 121: Guide post; 122: Guide sleeve; 13: Vertical core; 14: Sleeve; 15: Straight push rod; 16: Second guiding mechanism; 161: Middle support edge; 162: Middle support head; 17: Ejection limit block; 18: Spring limit rod; 19: Second reset spring; 20: Inclined top block; 21: First return spring; 22: Inclined guide post; 23: Trash nail; 24: Positioning key; 25: Cooling water flow channel; 100: Bottle cap part; 101: Grip part; 102: Threaded connection; 1021: Anchor groove; 1022: Process groove; 200: Fixed mold; 300: Moving mold. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] See Figures 1 to 10 This utility model provides an injection mold for secondary overmolding of bottle cap parts, comprising: a molding assembly, a template assembly, a mold frame assembly, an ejection assembly, and a guide assembly; the bottle cap part 100 includes a gripping part 101 and a threaded connection part 102; the molding assembly includes a fixed mold 200 and a moving mold 300; a core is formed on the moving mold 300; a positioning structure matching the threaded connection part 102 is provided on the core; a cavity is formed on the fixed mold 200; a core is formed on the moving mold 300; the shape of the injection cavity formed after the moving mold 300 and the fixed mold 200 are closed corresponds to the gripping part 101 and forms a parting surface; the injection mold is used to overmold the gripping part 101 onto the threaded connection part 102; wherein, The threaded connection portion 102 is a hollow cylindrical shape. The threaded connection portion 102 includes an anchoring end and a threaded end that are disposed opposite each other in the axial direction of the threaded connection portion 102. The outer wall of the anchoring end is provided with a plurality of anchoring grooves 1021 for anchoring the gripping portion 101. The threaded end is provided with an external thread. The gripping portion 101 is sleeved on the outer wall of the anchoring end through the anchoring grooves 1021. The core matches the inner sidewall of the threaded connection portion 102 to position the bottle cap part 100. The template assembly includes a movable template 3 and a fixed template 2; the template frame assembly includes a movable mold fixing plate 5 and a fixed mold fixing plate 1; the fixed mold 200 is fixedly disposed in the fixed template 2, and the movable mold 300 is fixedly disposed in the fixed template 2; The molding assembly further includes a slanted ejector mechanism, which includes a pair of opposing slanted ejector blocks 20. The slanted ejector blocks 20 are slidably disposed on the moving template 3 and the moving mold 300. The moving template 3 and the moving mold 300 are provided with sliding grooves that match the slanted ejector blocks 20. The slanted ejector blocks 20 include a molding end and a driving end. The molding end faces the interior of the moving mold 300 so as to participate in forming the parting surface of the holding part 101 when the mold is closed. A reset member is also provided between the moving mold 300 and the slanted ejector blocks 20 so as to reset the slanted ejector blocks 20 when the mold is opened. The driving end is located on the side away from the moving mold 300. The driving end includes a sliding contact surface. The fixed mold 200 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.

[0026] After the previous injection molding is completed, the moving mold 300 and the fixed mold 200 separate at the parting surface. Then, the reset component pushes the inclined ejector blocks 20 of the inclined ejector mechanism along their sliding grooves towards the original direction away from the center of the moving mold 300. After the inclined ejector blocks 20 separate to both sides, the threaded ends of the threaded connection 102 are completely disengaged, and then the ejection system ejects the bottle cap part 100; after ejection, the ejection system resets. At this time, the operator or automated robot places the pre-molded threaded connection 102 into the preset position of the moving mold 300, where the threaded ends are located between the inclined ejector blocks 20. During mold closing, the cutting surface on the fixed mold 200 first contacts the sliding contact surface of the inclined ejector blocks 20, forcing them to slide along the sliding grooves towards the center of the mold. The pair of inclined ejector blocks 20 gradually close, eventually forming a complete injection cavity with the moving mold 300 and the fixed mold 200.

[0027] Preferably, the forming end includes a top surface and a side surface; the top surface is coplanar with the parting surface of the moving mold 300, and a forming cavity is formed on the top surface, which cooperates with the fixed mold 200 to jointly form the bottom surface of the gripping part 101; the side surface is semi-circular, and the side surfaces of a pair of inclined ejector blocks 20 together form a complete circular cavity when the mold is closed, so as to accommodate and cover the threaded end of the threaded connection part 102, thereby restricting the axial movement of the threaded connection part 102.

[0028] The core includes a vertical core 13, which includes a fixed end fixed to the moving mold fixing plate 5. Its main body passes through the moving template 3 and the moving mold 300 in sequence and extends to the cavity. The vertical core 13 has a positioning key 24 extending axially along its sidewall. The threaded connection 102 has a keyway matching the positioning key 24 on its inner wall and a process groove 1022 matching the positioning key 24 on its threaded end, which restricts the circumferential rotation of the threaded connection 102.

[0029] When the worker or robot places the pre-injection molded threaded connection 102, the threaded connection 102 is nested on the vertical core 13, and the process groove 1022 engages with the positioning key 24 during placement until the bottom surface of its threaded end contacts the moving mold 300; when the mold is closed, the inclined ejector block 20 slides toward the vertical core 13, and the side of the molding end wraps tightly around the threaded end, so that the anchoring end is in the injection cavity; the molding end of the inclined ejector block 20 divides the threaded connection 102 into two parts, and the threaded end will not interfere with the anchoring end that needs to be injection molded, so that the gripping part 101 is formed at the anchoring end as required.

[0030] Preferably, the inclined ejector mechanism further includes an inclined guide post 22, which is inclinedly disposed in the fixed template 2 and fixed inside the fixed template 2, with its axis parallel to the sliding contact surface of the inclined ejector block 20; the inclined ejector block 20 has an inclined guide hole matching the inclined guide post, and the inclined guide post passes through the inclined guide hole to form a sliding pair; one end of the elastic element abuts against the inclined ejector block 20, and the other end abuts against the moving mold 300, so as to drive the inclined ejector block 20 to reset after molding; The reset component is a first reset spring 21, one end of which abuts against the inclined top block 20, and the other end abuts against the moving mold 300; The molding assembly also includes a nozzle 11, which is connected to the injection nozzle of the injection molding machine to inject glue into the cavity formed by the fixed mold 200 and the moving mold 300. The fixed mold 200 has a first injection hole, and the fixed mold plate 1 and the fixed mold plate 2 have a second injection hole and a third injection hole that match the first injection hole. The nozzle 11 passes through the first injection hole, the second injection hole, and the third injection hole. The moving mold 300 has a sprue channel that matches the first injection hole. The mold frame assembly also includes a pair of support blocks 4, with the two ends of the support blocks 4 respectively fastened to the moving template 3 and the moving mold fixing plate 5, so that a receiving space is formed between the moving template 3 and the moving mold fixing plate 5 to accommodate the ejection assembly; The ejection assembly includes a first ejector pin fixing plate 6, a second ejector pin fixing plate 7, a straight ejector rod 15, and a sleeve 14 sleeved on the vertical core 13. The straight ejector rod 15 and the sleeve 14 include an ejection end and a positioning end. A guide hole perpendicular to the parting surface is opened in the moving mold 300 to match the ejection end. The first ejector pin fixing plate 6 is disposed between the moving mold plate 3 and the moving mold fixing plate 5, and has a countersunk hole to match the fixing end of the sleeve 14 and the straight ejector rod 15. The fixing end of the sleeve 14 and the straight ejector rod 15 is disposed in the countersunk hole. The second ejector pin fixing plate 7 is located between the first ejector pin fixing plate 6 and the moving mold fixing plate 5. The first ejector pin fixing plate 6 and the second ejector pin fixing plate 7 are stacked parallel to each other to fix the sleeve 14 and the straight ejector rod 15.

[0031] The guiding assembly includes several first guiding mechanisms 12. Each first guiding mechanism 12 includes a guide post 121 and a guide sleeve 122 sleeved on the guide post 121. The guide post 121 is connected to the moving template 3, and the guide sleeve 122 is connected to the fixed template 2. The guide post 121 is slidably arranged within the guide sleeve 122 along the direction of the guide sleeve 122.

[0032] The inclined guide post 22 is fixed at a specific angle inside the fixed mold plate 2, and its axis is parallel to the sliding contact surface of the inclined ejector block 20. Correspondingly, an inclined guide hole is machined on the inclined ejector block 20 to precisely match the inclined guide post 22. During mold closing and opening, the inclined guide post 22 passes through the inclined guide hole and forms a high-pair contact with it, thereby reliably converting the vertical opening and closing motion between the fixed mold plate 2 and the moving mold plate 3 into lateral motion that drives the inclined ejector block 20 to slide along its preset inclined track. To ensure that the inclined ejector block 20 can automatically and accurately return to its initial position after mold opening, a first return spring 21 is also provided. One end of the return spring abuts against the inclined ejector block 20, and the other end abuts against the moving mold 300, providing a continuous elastic return force for the inclined ejector block 20. Molten plastic is injected into the mold cavity through a specialized injection system. This system includes a nozzle 11, the outer end of which connects to the injection nozzle of the injection molding machine. After passing through the nozzle 11, the molten material flows sequentially through the first injection hole on the fixed mold 200, the second injection hole on the fixed mold plate 1, and the third injection hole on the fixed mold plate 2. These injection holes are aligned with each other, forming the main channel for the molten material. Finally, the molten material enters the sprue channel on the moving mold 300 and smoothly fills the sealed cavity formed by the closing of the fixed mold 200 and the moving mold 300 through the gate at the end of the sprue channel.

[0033] Both the ejector pin 15 and the sleeve 14 are designed with ejector ends for contacting the product and positioning ends for fixing. The moving mold 300 has guide holes machined inside, perpendicular to the parting surface, that precisely mate with these ejector ends. The first ejector pin fixing plate 6 is located within the aforementioned receiving space, and has countersunk holes in which the positioning ends of the sleeve 14 and the ejector pin 15 are installed. The second ejector pin fixing plate 7 is stacked below the first ejector pin fixing plate 6, and the two are locked together by fasteners, firmly clamping and fixing the ejector pin 15 and the sleeve 14. When the injection molding machine ejector pushes the ejector pin fixing plate, the ejector pin 15 and the sleeve 14 move forward synchronously, their ejector ends passing through the guide holes and acting on the product, achieving smooth demolding.

[0034] Preferably, the ejection assembly further includes several second guide mechanisms 16, each second guide mechanism 16 including a pair of central support edges 161 and central support rods 162. The central support rods 162 are slidably disposed outside the central support edges 161 along the direction of the central support edges 161. The first ejector pin fixing plate 6 and the second ejector pin fixing plate 7 are provided with matching central support rod 162 fixing through holes to fix the central support rods 162. One end of the central support edge 161 is disposed on the moving mold fixing plate 5, and the other end is disposed on the moving mold plate 3. The moving mold fixing plate 5 is also provided with several through holes so that the pushing mechanism on the injection molding machine can push the ejection component.

[0035] During operation, the center support 162, fixed to the ejector plate, is sleeved on the outside of the fixed center support edge 161 and can slide with high precision along the axial direction of the center support edge 161. This design provides additional vertical guidance and support for the reciprocating motion of the first ejector plate 6 and the second ejector plate 7, independent of the main directional system. It can effectively resist the lateral forces that may be generated at the moment of ejection, ensuring that the entire ejection system composed of the straight ejector rod 15 and the sleeve 14 moves in a straight line, greatly improving the reliability, stability and service life of the ejection action, and helping to protect the straight ejector rod 15 and the precision structure inside the mold cavity.

[0036] Preferably, the ejection assembly further includes a reset assembly, which includes several second reset springs 19 and spring limiting rods 18 that match the second reset springs 19. One end of the second reset spring 19 abuts against the first ejector pin fixing plate 6, and the other end abuts against the moving template 3. The spring limiting rods 18 are passed through the central axis of the second reset spring 19. The first ejector pin fixing plate 6 has countersunk holes for fixing the spring limiting rods 18, and the moving template 3 has sliding through holes for the spring limiting rods 18 to slide.

[0037] The elastic force of the return spring pushes the first ejector pin fixing plate 6 and the second ejector pin fixing plate 7 back to their original positions after ejection, and then completes the next injection molding action. The axis of the spring limit rod 18 coincides with the axis of the return elastic element, providing a stable axial constraint.

[0038] Preferably, the ejection assembly further includes several ejection limiting blocks 17, which are disposed on the first ejector pin fixing plate 6 and face the moving template 3.

[0039] The ejection limit block 17 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 rod 15 from exceeding its stroke limit, and ensures the safety and consistency of the ejection action.

[0040] Preferably, the mold frame assembly further includes several support columns, which are disposed between the moving mold plate 3 and the moving mold fixing plate 5. One end of the support column is connected to the moving mold plate 3, and the other end is connected to the moving mold fixing plate 5. The first ejector pin fixing plate 6 and the second ejector pin fixing plate 7 are provided with clearance holes for the support columns to pass through.

[0041] The ejector pin fixing plate needs to move smoothly and steadily back and forth during ejection. The presence of the support column stabilizes the entire frame structure of the moving mold 300 side, reducing the deformation of the moving mold plate 3 under pressure. This overall increase in rigidity makes the movement trajectory of the first ejector pin fixing plate 6 and the second ejector pin fixing plate 7 more stable when guided by the middle support edge 161 and the guide sleeve 122. 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.

[0042] Preferably, the ejection assembly further includes a plurality of waste pins 23, which are disposed on the second ejector pin fixing plate 7 and face the moving mold fixing plate 5.

[0043] The debris pin 23 is a small support component that creates a small gap between the second ejector pin fixing plate 7 and the moving mold fixing plate 5. 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 7, thereby improving the reliability of mold operation.

[0044] Preferably, it also includes a cooling assembly, which includes a cooling water channel 25 formed in the fixed mold plate 2, the moving mold plate 3, the moving mold 300 and the fixed mold 200. The starting point of the cooling water channel 25 is connected to a cooling water inlet pipe and the ending point is connected to a cooling water outlet pipe.

[0045] The cooling water channel 25 removes excess heat generated by the molten plastic in the mold, preventing defects in the irregular tee due to high temperature. 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, extending mold life, and maintaining a balanced overall mold temperature, reducing flash or dimensional deviations caused by thermal deformation.

[0046] Preferably, it also includes a safety switch 8, which is disposed on the moving mold fixing plate 5, and the second ejector pin fixing plate 7 is provided with a safety switch activation block 9 that matches the safety switch 8.

[0047] The injection molding machine's control system will only receive a "mold closing permitted" signal when all safety switches 8 are correctly pressed. This prevents operator injury and crushing accidents, as well as serious damage to the mold cavity caused by foreign objects during mold closing, thus avoiding economic losses and production downtime.

[0048] The locking module 10 locks the moving template 3 and the fixed template 2 with screws when the mold is not in use, preventing injury to operators if the moving template 3 and the fixed template 2 come loose during handling or when the mold is idle, and preventing a decrease in overall accuracy caused by the loosening of the templates.

[0049] 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 bottle cap parts, comprising a molding assembly, a template assembly, a mold frame assembly, an ejection assembly, and a guide assembly; the bottle cap part includes a gripping portion and a threaded connection portion; the molding assembly includes a fixed mold and a moving mold; a core is formed on the moving mold; a positioning structure matching the threaded connection portion is provided on the core; a cavity is provided on the fixed mold; a core is formed on the moving mold; the shape of the injection cavity formed after the moving mold and the fixed mold are closed corresponds to the gripping portion and forms a parting surface; characterized in that... The injection mold is used to cover and mold the gripping portion onto the threaded connection portion; wherein... The threaded connection is a hollow cylindrical shape, including an anchoring end and a threaded end that are arranged opposite each other in the axial direction of the threaded connection. The outer wall of the anchoring end is provided with several anchoring grooves for anchoring the gripping part, and the threaded end is provided with external threads. The gripping part is sleeved on the outer wall of the anchoring end through the anchoring grooves. The core matches the inner sidewall of the threaded connection to position the bottle cap part. 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 a slanted ejector mechanism, which comprises a pair of opposing slanted ejector blocks. The slanted ejector blocks are 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 slanted ejector blocks. Each slanted ejector block includes a molding end and a driving end. The molding end faces the interior of the moving mold so as to participate in forming the parting surface of the gripping part when the mold is closed. A reset member is also provided between the moving mold and the slanted ejector blocks to reset the slanted ejector blocks when the mold is opened. 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 forming end includes a top surface and a side surface; the top surface is coplanar with the parting surface of the moving mold, and a forming cavity is formed on the top surface, which cooperates with the fixed mold to jointly form the bottom surface of the gripping part; the side surface is semi-circular, and the side surfaces of a pair of inclined ejector blocks together form a complete circular cavity when the mold is closed, so as to accommodate and cover the threaded end of the threaded connection part, thereby restricting the axial movement of the threaded connection part; The core includes a vertical core, which includes a fixed end fixed to the moving mold fixing plate. Its main body passes through the moving template and the moving mold in sequence and extends to the cavity. A locating key is provided on the side wall of the vertical core, extending along the axial direction of the vertical core. A keyway matching the locating key is provided on the inner wall of the threaded connection. A process groove matching the locating key is provided on the threaded end, so as to restrict the circumferential rotation of the threaded connection.

3. The injection mold as described in claim 2, characterized in that, The inclined ejector mechanism also includes an inclined guide post, which is inclinedly disposed in the fixed template and fixed inside the fixed template. The axis of the guide post 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 post. The inclined guide post passes through the inclined guide hole and forms 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 reset component is a first reset spring, one end of which abuts against the inclined ejector block, and the other end abuts against the moving mold; 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 fixed mold plate and the fixed mold plate have a second injection hole and a third 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 moving mold has a sprue channel that matches the first injection hole. 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 ejection assembly; The ejection assembly includes a first ejector plate, a second ejector plate, a straight ejector rod, and a sleeve fitted onto the vertical core. The straight ejector rod and the sleeve each have an ejection end and a positioning end. A guide hole perpendicular to the parting surface and matching the ejection end is provided in the moving mold. The first ejector plate is disposed between the moving mold plate and the moving mold fixing plate, and has a countersunk hole matching the fixing end of the sleeve and the straight ejector rod. The fixing end of the sleeve and the straight ejector rod is disposed in the countersunk hole. The second ejector plate is located between the first ejector plate and the moving mold fixing plate. The first ejector plate and the second ejector plate are stacked parallel to each other to fix the sleeve and the straight ejector rod. 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.

4. The injection mold as described in claim 3, 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.

5. The injection mold as described in claim 3, characterized in that, The ejection assembly further includes a reset assembly, which includes several second reset springs and spring limiting rods that match the second reset springs. One end of the second reset spring abuts against the first ejector pin fixing plate, and the other end abuts against the moving template. A spring limiting rod passes through the central axis of the second reset spring. The first ejector pin fixing plate has a countersunk hole for fixing the spring limiting rod. The moving template has a sliding through hole for the spring limiting rod to slide.

6. The injection mold as described in claim 3, characterized in that, The ejection assembly further includes several ejection limiting blocks, which are disposed on the first ejector pin fixing plate and face the moving template.

7. The injection mold as described in claim 3, 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 3, characterized in that, The ejection assembly also includes several waste pins, which are disposed on the second ejector pin fixing plate and face 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 3, characterized in that, It also includes a safety switch, which is disposed on the moving mold fixing plate, and the second ejector pin fixing plate is provided with a safety switch activation block that matches the safety switch.

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