Bottle cap injection mold structure

Abstract

The utility model discloses a bottle lid injection mold structure relates to bottle lid production technical field, including bottom plate, ejection fixed plate and backing pad, the middle part of bottom plate outer wall is equipped with ejection fixed plate, and the middle part of ejection fixed plate is connected with backing pad, the side that the backing pad is away from ejection fixed plate is connected with gear mounting plate, and the middle part of gear mounting plate outer wall is connected with core fixed plate, the one side of gear mounting plate outer wall is connected with support seat through screw, and support seat outer wall is equipped with servo motor, and servo motor output fixedly connected with drive gear, the outer wall of drive gear is engaged with transmission gear, and the outer wall of transmission gear is engaged with overbridge gear, and the both sides of overbridge gear outer wall are engaged with driven gear, the inner wall of driven gear is connected with screw core, and the inner wall of screw core is connected with middle core shaft, the inner wall one side of ejection fixed plate is equipped with no.

Description

Technical Field

[0001] This utility model relates to the field of bottle cap production technology, specifically to a bottle cap injection mold structure. Background Technology

[0002] Bottle cap injection molds are specialized injection molding molds designed specifically for the shape, internal threads, anti-theft rings, buckles, and sealing ribs of plastic bottle caps, such as screw caps, tamper-evident caps, flip caps, and spray caps. They are complete tooling structures that rely on injection molding machines to complete the melting, filling, cooling, and demolding of plastic, and mass-produce various types of plastic bottle caps. In short, molten plastic is injected into the mold cavity, cooled and shaped, and then bottle cap products that meet the design requirements are produced efficiently and with high quality.

[0003] The existing mold gear structure lacks a dedicated storage cavity, with gear components directly exposed. During production, dust easily accumulates, and the gears are subject to impacts and knocks. Long-term operation exacerbates gear wear, jamming, and transmission stagnation, shortening the service life of the mold's transmission components and the overall mold. It also reduces the coaxiality and operational accuracy of the various transmission components, causing demolding misalignment and unstable operation. Furthermore, forcibly ejecting the product while the bottle cap threads are still attached to the core and under significant clamping force results in uneven force during ejection, easily leading to appearance defects such as whitening, cracking, and overall deformation of the bottle cap. It also squeezes and tears the internal thread structure of the bottle cap, causing batch scrapping and poor molding quality stability. Utility Model Content

[0004] The purpose of this utility model is to provide a bottle cap injection mold structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a bottle cap injection mold structure, comprising a base plate, an ejector fixing plate, and a pad. The ejector fixing plate is installed in the middle of the outer wall of the base plate, and a pad is connected to the middle of the ejector fixing plate. A gear mounting plate is connected to the side of the pad away from the ejector fixing plate. A core fixing plate is connected to the middle of the outer wall of the gear mounting plate, and a guide sleeve fixing plate is connected to the middle of the core fixing plate. A base plate is fixedly connected to the middle of the outer wall of the guide sleeve fixing plate. A support seat is connected to one side of the outer wall of the gear mounting plate by screws. A servo motor is installed on the outer wall of the seat, and a drive gear is fixedly connected to the output end of the servo motor. A transmission gear is meshed with the outer wall of the drive gear, and a bridge gear is meshed with the outer wall of the transmission gear. Driven gears are meshed with the outer sides of the outer wall of the bridge gear. A threaded core is connected to the inner wall of the driven gear, and a central spindle is connected to the inner wall of the threaded core. A first mold is installed on one side of the inner wall of the ejection fixing plate, and a second mold is installed on the other side. Both the first and second molds have mold cavities on both sides inside, and the bottle cap body is connected inside the mold cavity.

[0006] Preferably, the mold cavity is used to form the outer contour of the bottle cap body, the threaded core is used to form the internal thread of the bottle cap body, and the gear mounting plate has a storage cavity corresponding to the transmission gear and the bridge gear.

[0007] Preferably, the servo motor is used to provide rotational power, and the transmission gear and the bridge gear are used to transmit power; the driven gear is used to drive the threaded core to rotate, and the threaded core can be screwed away from the bottle cap body.

[0008] Preferably, both the No. 1 mold and the No. 2 mold are connected to a base at their bottom ends, and ejector rods are connected to both sides inside the base. The ejector rods are used to eject the bottle cap body inside the mold cavity.

[0009] As can be seen from the above, the bottle cap injection mold structure provided by this utility model has the following beneficial effects.

[0010] The base plate, ejector fixing plate, pad plate, gear mounting plate, guide sleeve fixing plate and base plate are stacked and matched layer by layer to form an integrated mold bearing frame. The overall structure is regular and the stress is uniform, which can withstand the high pressure of injection molding and the impact load of mold opening and closing. At the same time, the gear mounting plate has a special storage cavity inside to store the transmission gear, bridge gear and other transmission components, reducing the overall space occupied by the mold.

[0011] Using a servo motor as the power source, and in conjunction with drive gears, transmission gears, bridge gears, and driven gears on both sides to form a multi-stage synchronous transmission structure, it can simultaneously drive two sets of threaded cores to rotate and retract synchronously and at the same speed, realizing the synchronous unscrewing operation of dual-cavity bottle caps. Moreover, during the demolding process, the bottle cap body is limited and fixed by the cavity and will not rotate with the threaded core, completely avoiding defects such as thread tearing, chipping, and deformation of the bottle cap, thus improving the bottle cap molding qualification rate.

[0012] The outer contour of the bottle cap is formed by molding the mold cavity, and the inner thread and internal structure of the bottle cap are formed by the threaded core and the central shaft. The mold cavity and the core are matched with high precision. At the same time, a step-by-step demolding logic is adopted, which first unscrews the thread and then ejects it mechanically. After the thread is completely detached, the product is smoothly ejected axially by the ejector rod. This avoids problems such as whitening, deformation, cracking and thread extrusion damage caused by direct ejection of the bottle cap by traditional molds, thus ensuring the appearance quality and performance of the bottle cap. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the core fixing plate and drive gear of this utility model; Figure 3 This is a three-dimensional structural diagram of the gear mounting plate and the bridge gear of this utility model; Figure 4This is a three-dimensional structural diagram of the drive gear, bridge gear, and driven gear of this utility model. Figure 5 This is a three-dimensional structural diagram of the base and ejector rod of this utility model from a bottom view; Figure 6 This is a top-view three-dimensional structural diagram of mold No. 1, mold No. 2, and the bottle cap body of this utility model; Figure 7 This is a three-dimensional structural diagram of the driven gear, central spindle, and model cavity of this utility model; Figure 8 This is a three-dimensional structural diagram of the driven gear, central shaft, and threaded core of this utility model.

[0014] In the diagram: 1. Base plate; 2. Ejector fixing plate; 3. Pad plate; 4. Gear mounting plate; 5. Core fixing plate; 6. Guide sleeve fixing plate; 7. Base plate; 8. Servo motor; 9. Drive gear; 10. Transmission gear; 11. Bridge gear; 12. Driven gear; 13. Threaded core; 14. Central mandrel; 15. Mold No. 1; 16. Mold No. 2; 17. Mold cavity; 18. Bottle cap body; 19. Base; 20. Ejector rod. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1-8 This utility model provides a technical solution: a bottle cap injection mold structure, including a base plate 1, an ejector fixing plate 2, and a pad plate 3. The base plate 1 is the basic support component of the entire mold. The ejector fixing plate 2 is installed in the middle of the outer wall. The pad plate 3 is connected in the middle of the ejector fixing plate 2. The side of the pad plate 3 away from the ejector fixing plate 2 is fixedly connected to a gear mounting plate 4. The gear mounting plate 4 is connected to a core fixing plate 5 in the middle of the outer wall. The core fixing plate 5 is connected to a guide sleeve fixing plate 6 in the middle of the outer wall. The guide sleeve fixing plate 6 is fixedly connected to a base plate 7 in the middle of the outer wall. The plates are stacked in sequence to form the main frame of the mold, providing an installation and support foundation for the internal transmission and forming components. A support base is connected to one side of the outer wall of the gear mounting plate 4 by screws. A servo motor 8 is mounted on the outer wall of the support base, and the output end of the servo motor 8 is fixedly connected to the drive gear 9. The outer wall of the drive gear 9 is meshed with the transmission gear 10, and the outer wall of the transmission gear 10 is meshed with the bridge gear 11. Two driven gears 12 are simultaneously meshed on both sides of the outer wall of the bridge gear 11. The inner wall of the driven gear 12 is fixedly connected to the threaded core 13, and the inner wall of the threaded core 13 is equipped with a central spindle 14. The gear mounting plate 4 has a storage cavity corresponding to the transmission gear 10 and the bridge gear 11, which can accommodate the gear components and ensure the compact operation of the transmission structure.

[0017] Mold 15 is installed on one side of the inner wall of the ejector plate 2, and mold 16 is installed on the other side. Mold 15 and mold 16 together form a cavity module for forming the outer contour of the bottle cap. Mold 15 and mold 16 have mold cavities 17 on both sides inside. Mold cavities 17 are used to form the outer contour of the bottle cap body 18. The threaded core 13 extends into the mold cavity 17 and cooperates with the mold cavity 17 to form a complete bottle cap injection mold cavity, while forming the internal thread structure of the bottle cap body 18. The bottom ends of mold 15 and mold 16 are connected to bases 19. Ejector rods 20 are installed on both sides inside the base 19. The ejector rods 20 can move axially and are used to eject the bottle cap body 18, which has completed the thread demolding in the mold cavity 17, from the mold, realizing automatic unloading.

[0018] In practice, the mold is closed as a whole, and the base plate 1, ejector fixing plate 2, pad plate 3, gear mounting plate 4, guide sleeve fixing plate 6 and base plate 7 are fitted and locked together; the first mold 15 and the second mold 16 are completely closed, so that the internal mold cavity 17 forms a molding space; at the same time, the threaded core 13 extends into the mold cavity 17 as a whole, and the central core shaft 14 is in place with the threaded core 13. The mold cavity 17 forms the outer contour of the bottle cap, and the threaded core 13 forms the inner thread of the bottle cap, forming a complete bottle cap molding cavity.

[0019] Molten plastic is injected into the closed mold cavity 17, and the plastic completely covers the surface of the threaded core 13, filling the entire mold cavity space. After being cooled at a constant temperature by the mold cooling system, the plastic solidifies and forms the bottle cap body 18. After the bottle cap body 18 cools and shrinks, it hugs the outer wall of the threaded core 13, so that the bottle cap body 18 is firmly attached to the outside of the threaded core 13.

[0020] After injection molding and cooling, the servo motor 8 starts working, and the output of the servo motor 8 drives the drive gear 9 to rotate. The drive gear 9 meshes and drives the transmission gear 10 to rotate, and the transmission gear 10 further drives the bridge gear 11 to drive synchronously. The bridge gear 11 meshes on both sides simultaneously and drives the two sets of driven gears 12 to rotate synchronously. The driven gears 12 drive the threaded core 13 to rotate precisely. The threaded core 13 rotates and retracts according to the thread pitch trajectory of the bottle cap, gradually unscrewing and disengaging from the internal thread of the bottle cap body 18. During the threading process, the bottle cap body 18 is limited by the mold cavity structure and will not rotate with the threaded core 13, ensuring that the thread is disengaged smoothly and without tearing, realizing a fully automatic unscrewing action.

[0021] After the threaded core 13 is completely screwed off the bottle cap body 18, the ejector rod 20 inside the base 19 pushes forward and acts on the bottom of the bottle cap body 18, smoothly ejecting the bottle cap body 18, which is completely detached from the thread, from the mold cavity 17, so that the bottle cap body 18 is detached from the mold and the finished product is automatically unloaded.

[0022] After the finished product is ejected from the mold, the ejector rod 20 resets, the servo motor 8 rotates in the opposite direction, driving each gear and threaded core 13 back to the initial molding position, the mold closes and locks again, and enters the next injection molding cycle, realizing continuous automated production.

[0023] This design uses a base plate 1, an ejector fixing plate 2, a pad plate 3, a gear mounting plate 4, a core fixing plate 5, a guide sleeve fixing plate 6, and a base plate 7 to form an integrated mold bearing frame. The overall structure is regular and the stress is even, which can withstand the high pressure of injection molding and the impact load of mold opening and closing. At the same time, the gear mounting plate 4 has a dedicated storage cavity to house the transmission components such as the transmission gear 10 and the bridge gear 11, which reduces the overall space occupied by the mold, avoids the problems of exposed gears accumulating dust and being damaged by bumps, and improves the overall structural stability and service life of the mold.

[0024] A servo motor 8 is used as the power source, which, together with the drive gear 9, transmission gear 10, bridge gear 11, and driven gears 12 on both sides, forms a multi-stage synchronous transmission structure. This structure can simultaneously drive two sets of threaded cores 13 to rotate and retract synchronously and at the same speed, achieving synchronous unscrewing of the dual-cavity bottle cap. Furthermore, during the demolding process, the bottle cap body 18 is fixed by the cavity and will not rotate with the threaded core 13, completely avoiding defects such as thread tearing, chipping, and deformation of the bottle cap, thus improving the bottle cap molding qualification rate.

[0025] The outer contour of the bottle cap is formed by the mold cavity 17, and the internal thread and internal structure of the bottle cap are formed by the threaded core 13 and the central mandrel 14. The cavity and core fit with high precision, resulting in a bottle cap with a regular shape, full thread profile, and uniform dimensional accuracy. At the same time, a step-by-step demolding logic is adopted, which first unscrews the thread and then mechanically ejects the product. After the thread is completely detached, the product is smoothly ejected axially by the ejector rod 20, avoiding problems such as whitening, deformation, cracking, and thread extrusion damage caused by direct ejection of the bottle cap by traditional molds, thus ensuring the appearance quality and performance of the bottle cap.

[0026] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the protection scope of this utility model.

Claims

1. A bottle cap injection mold structure, comprising a base plate (1), an ejector fixing plate (2), and a pad (3), wherein the ejector fixing plate (2) is installed in the middle of the outer wall of the base plate (1), and the pad (3) is connected in the middle of the ejector fixing plate (2), characterized in that: A gear mounting plate (4) is connected to the side of the pad (3) away from the ejector fixing plate (2). A core fixing plate (5) is connected to the middle of the outer wall of the gear mounting plate (4). A guide sleeve fixing plate (6) is connected to the middle of the core fixing plate (5). A base plate (7) is fixedly connected to the middle of the outer wall of the guide sleeve fixing plate (6). A support seat is connected to one side of the outer wall of the gear mounting plate (4) by screws. A servo motor (8) is installed on the outer wall of the support seat. A drive gear (9) is fixedly connected to the output end of the servo motor (8). A transmission gear (10) is meshed with the outer wall of the drive gear (9). The outer wall of the transmission gear (10) is meshed with a bridge gear (11), and the outer walls of the bridge gear (11) are meshed with driven gears (12). The inner wall of the driven gear (12) is connected with a threaded core (13), and the inner wall of the threaded core (13) is connected with a central shaft (14). A first mold (15) is installed on one side of the inner wall of the ejector fixing plate (2), and a second mold (16) is installed on the other side. Both the first mold (15) and the second mold (16) have mold cavities (17) on both sides inside. The bottle cap body (18) is connected inside the mold cavity (17).

2. The bottle cap injection mold structure according to claim 1, characterized in that: The model cavity (17) is used to form the outer contour of the bottle cap body (18), the thread core (13) is used to form the inner thread of the bottle cap body (18), and the gear mounting plate (4) has a storage cavity inside that corresponds to the transmission gear (10) and the bridge gear (11).

3. The bottle cap injection mold structure according to claim 2, characterized in that: The servo motor (8) is used to provide rotational power, and the transmission gear (10) and the bridge gear (11) are used to transmit power; the driven gear (12) is used to drive the threaded core (13) to rotate, and the threaded core (13) can be rotated away from the bottle cap body (18).

4. The bottle cap injection mold structure according to claim 3, characterized in that: Both the No. 1 mold (15) and the No. 2 mold (16) are connected to a base (19) at their bottom ends. The base (19) has an ejector rod (20) connected to both sides inside. The ejector rod (20) is used to eject the bottle cap body (18) inside the mold cavity (17).

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