An internal core-pulling injection mold

Abstract

The present invention provides an internal core-pulling injection mold, comprising a movable mold push plate, a movable mold core plate and a support plate, a piston template is further arranged between the movable mold push plate and the movable mold core plate, a push plate cavity sleeve is embedded on the movable mold push plate, a cylinder sleeve is embedded on the piston template, a movable mold core is embedded on the movable mold core plate, a tunnel hole is provided on the movable mold core, two inner core-pulling sliders arranged opposite to each other are slidably connected in the tunnel hole, the inner core-pulling slider comprises a forming part and a guide part, the two inner core-pulling sliders are respectively formed with inclined guide surfaces on the opposite sides, a convex ridge is provided on one side of the forming part, a guide surface is provided on one side of the guide part, and a slider base is fixedly connected on the support plate. The present invention effectively solves the problem that the outer cover of the bottle cap is difficult to demould due to undercut, and can achieve mass production through injection molding, while the bottle cap consumer experience is relatively good and the production cost is relatively low.

Description

Technical Field

[0001] The invention relates to a mould, in particular to an inner core-pulling injection mould. Background Art

[0002] With the rapid development of the skin care products market, the market competition for skin care products is becoming increasingly fierce, especially in the mid-to-high-end cosmetics market. The quality of mid-to-high-end cosmetics packaging design directly affects the sales of products. In order to achieve good texture and high transparency, some high-end cosmetics packaging bottles are often made of glass. However, due to the disadvantages of glass being heavy, easy to break, high transportation costs, and not easy to carry, it affects the consumer experience. In addition, the secondary processing performance of glass packaging bottles, such as printing, is poor, and the production cost is relatively high.

[0003] To this end, the applicant has designed a glass-like plastic packaging bottle. In order to ensure that the packaging bottle has a relatively thick appearance and feel similar to that of a glass packaging bottle and to avoid shrinkage during injection molding, the bottle cap of the plastic packaging bottle is designed as a split combined cap, which is composed of an outer cap made of highly transparent plastic injection molding and an electroplated inner cap buckled in the inner cavity of the outer cap. In order to achieve the buckling of the outer cap and the electroplated inner cap, a buckle groove or a convex buckle is required to be provided in the inner cavity of the outer cap, resulting in an inverted buckle structure in the inner cavity of the outer cap that is difficult to demold. In the existing injection mold structure, this type of inverted buckle structure is usually solved by a forced stripping mechanism or a core pulling mechanism such as a slider side pull, an inclined top, etc. However, in order to ensure that the bottle cap has a glass-like texture, the injection molding material usually needs to be a hard plastic transparent material, and it is difficult to solve the problem of difficulty in demoulding by a strong demoulding mechanism. At the same time, in order to ensure that the bottle cap has a transparent and shiny beauty and grade similar to that of a glass bottle cap, no traces of inserts are allowed on the bottle cap, and it is difficult to solve the problem of difficulty in demoulding by core pulling mechanisms such as side pulls of sliders and inclined tops. In addition, the inner diameter of the bottle cap is usually only 20-25mm, which is relatively small, and there is not enough space for core pulling mechanisms such as inclined tops. The existence of these problems makes it difficult to achieve mass production of imitation glass plastic packaging bottles through injection molding.

[0004] In view of this, the applicant conducted an in-depth study on the above-mentioned issues, which led to the present case. Summary of the invention

[0005] The object of the present invention is to provide an inner core-pulling injection mold that can achieve mass production through injection molding and has a relatively good bottle cap consumption experience and a relatively low production cost.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] An internal core-pulling injection mold, comprising a movable mold push plate, a movable mold core plate and a support plate arranged in sequence, a piston template fixedly connected to the movable mold core plate is also arranged between the movable mold push plate and the movable mold core plate, a push plate cavity sleeve is embedded in the movable mold push plate, a cylinder sleeve is embedded in the piston template, a movable mold core is embedded in the movable mold core plate and sequentially inserted in the cylinder sleeve and the push plate cavity sleeve, a tunnel hole arranged vertically to the movable mold core is opened on the movable mold core, two inner core-pulling sliders arranged opposite to each other are slidably connected in the tunnel hole, and the inner core-pulling slider includes a push plate inserted in the push plate A forming part in the cavity sleeve and a guiding part integrally connected with the forming part and inserted in the cylinder sleeve, the two inner core-pulling sliders are respectively formed with inclined guide surfaces arranged in an eight-shaped shape on the sides facing each other, the forming part is provided with a convex ridge on the side away from the corresponding inclined guide surface, and the guiding part is provided with a guiding surface on the side away from the corresponding inclined guide surface, a slider base inserted in the dynamic model core is fixedly connected to the support plate, two inclined push surfaces respectively matched with each inclined guide surface one-to-one are provided on the slider base, and a push surface matched with each guide surface one-to-one is provided on the cylinder sleeve.

[0008] As an improvement of the present invention, the length of the guide portion is greater than the length of the forming portion.

[0009] As an improvement of the present invention, a first reset rod is fixedly connected to the movable mold push plate, a second reset rod is fixedly connected to the movable mold core plate, and a first needle plate group cooperating with the first reset rod and a second needle plate group cooperating with the second reset rod are also provided on the side of the support plate away from the movable mold core plate.

[0010] As an improvement of the present invention, the second needle plate group includes a second surface needle plate and a second bottom needle plate fixedly connected to each other, a water transport jacket being sealingly fixedly connected to the second surface needle plate, an end of the water transport jacket away from the second surface needle plate passes through the slider base and is sealingly fixedly connected to the side wall of the tunnel hole away from the second surface needle plate, a cooling hole connected to the water transport jacket is formed on the side wall of the tunnel hole away from the second surface needle plate, a nozzle pipe sequentially inserted into the water transport jacket and the cooling hole is fixedly connected to the second bottom needle plate, an outer diameter of the nozzle pipe is smaller than an inner diameter of the water transport jacket and the cooling hole, and a gap is formed between the nozzle pipe and the bottom of the cooling hole.

[0011] As an improvement of the present invention, an air intake passage is provided on the piston template, a first sealing ring cooperating with the movable mold push plate is provided at one end of the cylinder sleeve facing the movable mold push plate, the first sealing ring covers the inner hole mouth of the cylinder sleeve, a second sealing ring cooperating with the movable mold core is provided on the inner hole wall of the cylinder sleeve, and an air hole connected with the inner hole of the cylinder sleeve and the air intake passage respectively is opened on the cylinder sleeve, and the air hole is located between the second sealing ring and the first sealing ring.

[0012] As an improvement of the present invention, a third sealing ring cooperating with the slider base is arranged on the side wall of the inner hole of the moving model core.

[0013] As an improvement of the present invention, an annular air groove is provided on the outer wall of the cylinder liner, the air hole is provided at the bottom of the annular air groove, and the cylinder liner is provided with fourth sealing rings at positions on both sides of the annular air groove.

[0014] As an improvement of the present invention, an annular water groove is provided on the outer side wall of the push plate cavity sleeve and / or the dynamic mold core, and a fifth sealing ring is provided on both sides of the annular water groove.

[0015] An internal core-pulling injection mold, comprising a movable mold push plate, a movable mold core plate and a support plate arranged in sequence, a piston template fixedly connected to the movable mold core plate is also arranged between the movable mold push plate and the movable mold core plate, a push plate cavity sleeve is embedded in the movable mold push plate, a movable mold core is embedded in the movable mold core plate and sequentially inserted in the piston template and the push plate cavity sleeve, a tunnel hole arranged vertically to the movable mold core is opened on the movable mold core, two inner core-pulling sliders arranged opposite to each other are slidably connected in the tunnel hole, and the inner core-pulling slider includes a molding inserted in the push plate cavity sleeve The inner core-pulling sliders are provided with inclined guide surfaces arranged in an eight-shaped shape on the sides facing each other, the molding portion is provided with a convex ridge on the side away from the corresponding inclined guide surface, and the guide portion is provided with a guide surface on the side away from the corresponding inclined guide surface. A slider base inserted in the dynamic model core is fixedly connected to the support plate, and two inclined push surfaces respectively matched with each inclined guide surface in a one-to-one manner are provided on the slider base, and a push surface matched with each guide surface in a one-to-one manner is provided on the piston template.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects:

[0017] 1. By setting the tunnel hole and the inner core-pulling slider, the problem that the outer cover of the bottle cap is difficult to demould due to the inverted buckle is effectively solved, and mass production can be achieved through injection molding. At the same time, there will be no traces of inserts on the bottle cap. The bottle cap has a transparent and shiny beauty and grade similar to a glass bottle cap, and has a small weight, is not easy to break, has low transportation costs, is easy to carry, and has good secondary processing performance such as printing, so the consumer experience is relatively good and the production cost is relatively low.

[0018] 2. By setting up the water transport jacket and nozzle, the cooling time in the injection molding cycle can be effectively reduced, which helps to improve the quality of injection molded products and improve the efficiency of injection molding.

[0019] 3. By setting up air inlet channels and air holes, it is avoided that the negative pressure formed in the cavity after injection molding makes it difficult to remove the product from the mold cavity by suction using a suction cup.

[0020] 4. The design and use of tunnel-type concealed extraction mechanism solves the problem of product demoulding due to undercut, which satisfies the product assembly function and does not leave any traces of inserts on transparent products, so that the product maintains a good appearance. The overall structure is compact and ingenious, the function is stable, and the space occupied is small, so that the mold can be upgraded to one mold with multiple cavities, which ensures the quality of the product and improves production efficiency.

[0021] 5. By designing and using the cooling system with a "secondary ejection" structure, the water transport jacket and the dynamic model core are fixedly connected and move forward and backward together, so as to achieve rapid cooling of the core, shorten the product molding cycle, avoid quality abnormalities such as bubbles, shrinkage marks, welding marks, surface fog and patterns, etc., achieve good texture and high transparency of appearance, and greatly improve product qualification rate and production efficiency.

[0022] 6. By designing and using a gas-assisted ejection device, the vacuum suction in the mold cavity is released, making it easier for the product to be demoulded from the cavity, making the demoulding action smoother, avoiding the risk of mold compression after mold closing due to product sticking, and improving the production efficiency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the structure of the bottle cap to be formed in the embodiment;

[0024] Figure 2 It is a schematic diagram of the main structure of the inner core-pulling injection mold in the embodiment;

[0025] Figure 3 It is a side view structural schematic diagram of the inner core-pulling injection mold in the embodiment;

[0026] Figure 4 It is a schematic cross-sectional structural diagram of the inner core-pulling structure of the inner core-pulling injection mold in the embodiment;

[0027] Figure 5It is a cutaway axial schematic diagram of the inner core-pulling structure of the inner core-pulling injection mold in the embodiment.

[0028] The markings in the figure correspond to the following:

[0029] 10-cover body; 11-inner cavity;

[0030] 12- buckle groove; 21- movable mold push plate;

[0031] 22-dynamic model core plate; 23-support plate;

[0032] 24-fixed template; 25-guide column;

[0033] 26-piston template; 27-first reset rod;

[0034] 28-second reset rod; 31-push plate cavity sleeve;

[0035] 32-cylinder sleeve; 33-moving model core;

[0036] 34-inner core-pulling slider; 35-slider base;

[0037] 36-water transport set;

[0038] 37-cooling hole; 38-nozzle;

[0039] 39-annular water tank; 40-first needle plate group;

[0040] 41-first surface needle plate; 42-first bottom needle plate;

[0041] 50-second needle plate group; 51-second side needle plate;

[0042] 52-second bottom needle plate; 61-first sealing ring;

[0043] 62-second sealing ring; 63-third sealing ring;

[0044] 64- fourth sealing ring; 65- air hole;

[0045] 66- Annular air groove. DETAILED DESCRIPTION

[0046] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0047] The bottle cap structure to be formed by the inner core-pulling injection mold provided in this embodiment is as follows: Figure 1As shown, the bottle cap has a cover body 10 whose shape gradually changes from round to square. The cover body 10 is a hard plastic transparent cover body, preferably made of AS material, which has high impact strength, heat resistance, oil resistance and chemical corrosion resistance, is not easy to produce internal stress cracking, and has high transparency. The cover body 10 is provided with an inner cavity 11 with a mouth, the mouth of the inner cavity 11 is located at one end of the cover body 10 with a circular shape, and the inner diameter of the mouth of the inner cavity 11 is 22mm. The side wall of the mouth of the inner cavity 11 is provided with symmetrically arranged buckle grooves 12 and symmetrically arranged convex buckles. The connecting line between the two convex buckles (the connecting line is a virtual line) and the connecting line between the two buckle grooves 12 are arranged perpendicular to each other. Of course, the buckle groove 12 can also be provided with only a buckle groove 12 or a convex buckle according to actual needs.

[0048] like Figure 2-Figure 5 As shown, and see Figure 1 As shown, the inner core-pulling injection mold provided in this embodiment includes a movable mold push plate 21, a movable mold core plate 22 and a support plate 23 arranged in sequence, and of course should also include parts such as a fixed mold plate 24 and a guide column 25. The connection structure of the movable mold push plate 21, the movable mold core plate 22, the support plate 23, the fixed mold plate 24 and the guide column 25 is the same as the structure of a standard injection mold frame that can be directly purchased from the market, which is not the focus of this embodiment and will not be described in detail here. It should be noted that in this embodiment, the structure of the inner core-pulling injection mold is described by taking the mold closing state as an example.

[0049] A piston template 26 fixedly connected to the dynamic mold core plate 22 is also provided between the dynamic mold push plate 21 and the dynamic mold core plate 22, and a push plate cavity sleeve 31 penetrating the dynamic mold push plate 21 is embedded on the dynamic mold push plate 21, a cylinder sleeve 32 penetrating the piston template 26 is embedded on the piston template 26, and a dynamic mold core 33 penetrating the dynamic mold core plate 22 and sequentially inserted in the cylinder sleeve 32 and the push plate cavity sleeve 31 is embedded on the dynamic mold core plate 22, and the push plate cavity sleeve 31, the cylinder sleeve 32 and the dynamic mold core 33 are coaxially arranged with each other, and together constitute An internal core-pulling structure, in which the portion of the dynamic model core 33 that penetrates into the push plate cavity sleeve 31 and the inner hole of the push plate cavity sleeve 31 together form a cavity hole for forming the cover body 10. It should be noted that the above-mentioned coaxially arranged push plate cavity sleeve 31, cylinder sleeve 32 and dynamic model core 33 are not limited to only one group, and multiple groups can also be set to achieve one mold with multiple holes, thereby improving production efficiency. For the sake of convenience, the following only takes one group of coaxially arranged push plate cavity sleeve 31, cylinder sleeve 32 and dynamic model core 33 as an example for explanation.

[0050] A tunnel hole is provided on the dynamic model core 33 and is arranged perpendicular to the dynamic model core 33. The tunnel hole passes through the dynamic model core 33 and has a width of 14.0 mm (in this embodiment, the depth direction of the tunnel hole is the length direction, the axial direction of the dynamic model core 33 is the height direction, and the direction perpendicular to the length direction and the height direction is the width direction). Two inner core-pulling sliders 34 arranged back to back are slidably connected in the tunnel hole. Each inner core-pulling slider 34 includes a molding portion inserted in the push plate cavity sleeve 31 and a guide portion integrally connected to the molding portion and inserted in the cylinder sleeve 32. In the same inner core-pulling slider 34, the length of the guide portion is greater than the length of the molding portion, so that the cross-section of the inner core-pulling slider 34 in the vertical width direction is L-shaped, which can not only increase the rigidity of the inner core-pulling slider 34, but also save the stability of the movement of the inner core-pulling slider. The two inner core-pulling sliders 34 are formed with inclined guide surfaces arranged in an eight-shaped shape on the sides facing each other, that is, the two inclined guide surfaces are in an eight-shaped shape. Specifically, the spacing between the two inclined guide surfaces gradually increases from one end relatively close to the push plate cavity sleeve 31 to the other end, and the inclination angle of each inclined guide surface relative to the symmetric center plane of the two is six degrees. The side of the molding part away from the corresponding inclined guide surface is provided with a convex ridge for molding the buckle groove 12, that is, the molding part also constitutes a part of the side wall of the cavity. The side of the guide part away from the corresponding inclined guide surface is provided with a guide surface, and the guide surfaces of the two guide parts are also arranged in an eight-shaped shape.

[0051] The support plate 23 is fixedly connected with a slider base 35 inserted into the dynamic model core 33, one end of the slider base 35 abuts against the side wall of the tunnel hole away from the support plate 23, and the slider base 35 is provided with two inclined push surfaces that match the inclined guide surfaces one-to-one, and at the same time, the cylinder sleeve 32 is provided with a deduction surface that matches the guide surface one-to-one, and there are two deduction surfaces. It should be noted that the cylinder sleeve 32 may not be provided, but a through hole identical to the inner hole of the cylinder sleeve 32 may be provided on the piston template 26, and a deduction surface that matches the guide surface one-to-one may be provided on the side wall of the through hole.

[0052] Preferably, in order to enable the movable mold push plate 21 and the movable model core plate 22 to perform the mold opening action under the action of the push rod of the injection molding machine when opening the mold, a first reset rod 27 is fixedly connected to the movable mold push plate 21, and a second reset rod 28 is fixedly connected to the movable model core plate 22. The side of the support plate 23 away from the movable model core plate 22 is also provided with a first needle plate group 40 cooperating with the first reset rod 27 and a second needle plate group 50 cooperating with the second reset rod 28, wherein the first needle plate group 40 is located between the second needle plate group 50 and the support plate 23, the first needle plate group 40 includes a first face needle plate 41 and a first bottom needle plate 42 fixedly connected to each other, the second needle plate group 50 includes a second face needle plate 51 and a second bottom needle plate 52 fixedly connected to each other, the specific connection structure between each reset rod and the corresponding needle plate group and the specific connection structure between each reset rod and other parts are the same as the structure of a conventional injection mold frame, and will not be described in detail here.

[0053] When in use, after the mold is opened, the movable model core plate 22, under the push of the corresponding needle plate group, moves forward with the movable model core 33 (in this embodiment, the direction toward the fixed mold plate 24 is the front, and the other direction is the rear), and the movable model core 33 drives the inner core-pulling slider 34 placed in the tunnel hole to move forward synchronously. Since the slider base 35 is fixed on the support plate 23, when the movable model core plate 22 is separated from the support plate 23, the two inner core-pulling sliders 34 slide toward each other under the action of the corresponding inclined guide surface and the inclined push surface to realize the core-pulling action of the slider, and when the mold is closed, the two inner core-pulling sliders 34 slide back to each other under the action of the corresponding guide surface and the push surface to realize reset. The inner core-pulling structure provided in this embodiment effectively solves the demoulding problem of the product undercut, which not only meets the assembly function of the product, but also does not leave the insert mark on the transparent product, so that the product maintains a good appearance, and the overall structure is compact and ingenious, the function is stable, and the space occupied is small, so that the mold can be upgraded to one mold with multiple cavities, which not only ensures the quality of the product but also improves the production efficiency.

[0054] Preferably, in order to reduce the cooling time during the injection molding cycle and to avoid shrinkage deformation, yellowing, low light transmittance and other problems caused by uneven shrinkage of the cover body 10 due to uneven wall thickness, in this embodiment, a water transport sleeve 36 is sealed and fixedly connected to the second needle plate 51, and a sealing ring is arranged between one end of the water transport sleeve 36 and the second bottom needle plate 52, and the end of the water transport sleeve 36 away from the second needle plate 51 passes through the slider base 35 and is sealed and fixedly connected to the side of the tunnel hole away from the second needle plate 51. Specifically, a sealing ring is also provided between the water transport jacket 36 and the side wall of the tunnel hole; a cooling hole 37 connected to the water transport jacket 36 is opened on the side wall of the tunnel hole away from the second surface needle plate 51, which is used to cool the product in the cavity; a nozzle 38 is fixedly connected to the second bottom needle plate 52 and is sequentially inserted into the water transport jacket 36 and the cooling hole 37, the outer diameter of the nozzle 38 is smaller than the inner diameter of the water transport jacket 36 and the cooling hole 37, and a gap is formed between the nozzle 38 and the bottom of the cooling hole 37. When in use, the end of the nozzle 38 fixedly connected to the second bottom needle plate 52 is connected to the external water inlet pipe, and the end of the water transport sleeve 36 fixedly connected to the second surface needle plate 51 is connected to the external water outlet pipe. It should be noted that the external water inlet pipe and the external water outlet pipe are not part of the inner core-pulling bottle cap of this embodiment, and need to be configured separately when in use. The specific connection structure between the external water inlet pipe and the external water outlet pipe and the nozzle 38 or the water transport sleeve 36 is the same as the connection structure between the conventional water pipe and the injection mold. When the mold is closed, the dynamic model core plate 22 is pushed by the corresponding needle plate group to move the dynamic model core 33 forward. In this process, the water transport sleeve 36 and the nozzle 38 will also move at the same time to keep the relative position relationship with the dynamic model core 33 unchanged. The cooling water is transported to the cooling hole 37 of the dynamic model core 33 through the nozzle 38, and then flows back through the water transport sleeve 36 to complete the cooling circuit. In addition, an annular water groove 39 is provided on the outer wall of the push plate cavity sleeve 31 and / or the dynamic model core 33, and a fifth sealing ring is provided on both sides of the annular water groove 39, and the annular water groove is connected to the cooling circuit provided on the corresponding plate. The specific cooling circuit structure is the same as that of a conventional injection mold and will not be described in detail here. A water transport sleeve 36 is provided in the slider base 35 of the inner core pulling, the upper end face of the water transport sleeve 36 is in fixed contact with the tunnel face of the dynamic model core 33, and a sealing ring is installed to prevent cooling water from leaking into the inner core pulling mechanism, and the lower end face of the water transport sleeve 36 is fixed to the second needle plate 51, and the second needle plate 51 is connected and fixed to the core fixing plate through a reset rod. The dynamic model core plate 22 is pushed by the second needle plate 51 to move the dynamic model core forward. At the same time, the water transport sleeve 36 on the second needle plate 51 also supports the tunnel surface of the dynamic model core. The cooling water is transported to the dynamic model core through the nozzle of the second bottom needle plate 52, and then flows back to the water diversion core of the second bottom needle plate 52 through the water transport sleeve to complete the cooling circuit.

[0055] Since the shape of the cover body 10 gradually changes from a circle to a square, presenting an inverted cone structure, the entire cover body 10 will be retained in the push plate cavity sleeve 31 after the mold is opened. If the traditional ejector structure is used to push it out, it is easy to leave ejector marks on its surface, affecting the product quality. Therefore, a robot is required to use a suction cup to suck the cover body 10 out of the push plate cavity sleeve 31. However, after the injection molding is full, a vacuum or negative pressure is easily formed in the cavity hole, resulting in the suction cup needing to use a larger suction force to suck the cover body 10 out of the push plate cavity sleeve 31, which is easy to leave marks on the outer surface of the cover body 10, and even due to the occurrence of compression molding, how to make the retracted core-pulling mechanism in the dynamic model core 33 form a sealed space is the key condition for realizing the gas-assisted ejection action. A core sleeve is arranged outside the dynamic model 33 as a cylinder sleeve 32, and the cylinder sleeve is fixed on a piston template provided with an air inlet channel, and the piston template is fixedly connected to the dynamic mold push plate. A sealing ring is provided on the upper end surface of the cylinder sleeve 32 to seal the horizontal leakage passage of the dynamic model core 33 and the inner core. A gap is left between the inner hole of the cylinder sleeve 32 and the outer surface of the dynamic model core 33. A groove is provided on the side wall of the lower end of the inner hole of the cylinder sleeve 32. A step seal ring is installed in the groove. A cylindrical core piston column is provided under the tunnel opening of the dynamic model core 33. The step seal ring contacts and seals with the outer diameter of the core piston column and can reciprocate on the core piston column. When the dynamic mold push plate 21 moves up and down to demould, the longitudinal leakage passage of the dynamic model core 33 is sealed. A piston hole is provided at the lower end of the movable model 33, a piston column is provided at the lower end of the inner core-pulling slider base 35, a groove is provided on the lower end side wall of the piston hole of the movable model core 33, a Step seal ring is installed in the groove, the Step seal ring contacts and seals with the outer diameter of the piston column of the inner core-pulling slider base 35, and can reciprocate on the piston column of the inner core-pulling slider base 35. When the movable model core 33 and the inner core-pulling slider base 35 move up and down to pull the core, the longitudinal air leakage channel of the inner core-pulling slider base 35 is sealed, so that the inner shrinkage in the movable model core 33 The core pulling mechanism forms a sealed space with the product. Specifically, in this embodiment, an air inlet passage (not shown in the figure) is provided on the piston template 26, and a first sealing ring 61 cooperating with the movable mold push plate 21 is provided at one end of the cylinder sleeve 32 facing the movable mold push plate 21. The first sealing ring 61 covers the inner hole of the cylinder sleeve 32, and a second sealing ring 62 cooperating with the movable mold core 33 is provided on the inner hole wall of the cylinder sleeve 32. The cylinder sleeve 32 is provided with air holes 65 respectively connected with the inner hole of the cylinder sleeve 32 and the air inlet passage. The air holes 65 are connected with the inner hole of the cylinder sleeve 32 and the air inlet passage. 5 is located between the second sealing ring 62 and the first sealing ring 61. Specifically, an annular air groove 66 is provided on the outer wall of the cylinder sleeve 32, and the air hole 65 is provided at the bottom of the annular air groove 66. The cylinder sleeve 32 is provided with fourth sealing rings 64 at positions on both sides of the annular air groove 66. In this way, there is no need to calibrate the position of the air hole 65 during assembly, and the assembly speed is relatively fast. In addition, a third sealing ring 63 is provided on the side wall of the inner hole of the dynamic model core 33 to cooperate with the slider base 35, so that the inner core-pulling structure can form a sealed space.When in use, the air inlet channel is connected to the external air supply device (the external air supply device is not part of the inner core-pulling bottle cap mold of this embodiment and needs to be configured separately). When the mold is opened, the injection molding machine ejects the first needle plate 41 through the ejector rod, driving the first reset rod 27 to move forward synchronously with the movable mold push plate 21 and the piston mold plate 26. At the same time, the first needle plate 41 drives the second needle plate 51 to move forward together through the fixed-distance "buckle-type" secondary ejection mechanism of the injection molding machine, driving the second reset rod to move forward synchronously with the movable model core plate 22. When the movable model core plate 22 drives the movable model core 33 to separate from the slider base 35 fixed on the support plate 23, the movement of the slider base 35 will drive the inner core-pulling slider 34 to perform the core-pulling action; After completing the core pulling action, the fixed-distance "buckle-type" secondary ejection mechanism separates from the second needle plate 51, causing the dynamic model core plate 22 to stop moving, while the first needle plate 41 continues to push the dynamic mold push plate 21 and the piston template 26 to move forward, so that the product is separated from the dynamic model core 33. At this time, the product is still retained in the push plate cavity sleeve 31; then, air is supplied to the air inlet channel, so that the air flow impacts the product in the cavity, eliminates the vacuum sticking of the product, and pushes the product after the gas expands. At the same time, the suction cup of the manipulator sucks the product out to complete the demoulding action, so that the vacuum suction or negative pressure suction is released, the product is easier to demould, and the demoulding action is smoother, avoiding the risk of mold compression after mold closing due to product sticking, thereby improving the production efficiency of the product.

[0056] The present invention is described in detail above with reference to the accompanying drawings, but the embodiments of the present invention are not limited to the above embodiments. Those skilled in the art can make various modifications to the present invention based on the prior art, which all belong to the protection scope of the present invention.

Claims

1. An internal core-pulling injection mold, comprising a movable mold push plate, a movable mold core plate and a support plate arranged in sequence, characterized in that: A piston template fixedly connected to the dynamic mold core plate is also provided between the dynamic mold push plate and the dynamic mold core plate, a push plate cavity sleeve is embedded in the dynamic mold push plate, a cylinder sleeve is embedded in the piston template, a dynamic mold core is embedded in the dynamic mold core plate and sequentially inserted in the cylinder sleeve and the push plate cavity sleeve, a tunnel hole arranged vertically to the dynamic mold core is opened on the dynamic mold core, two inner core-pulling sliders arranged opposite to each other are slidably connected in the tunnel hole, and the inner core-pulling slider includes a molding portion inserted in the push plate cavity sleeve and a molding portion connected to the molding portion A guide portion integrally connected and inserted in the cylinder sleeve, inclined guide surfaces arranged in an eight-shape are formed on the sides facing each other of the two inner core-pulling sliders, a convex ridge is provided on the side of the forming portion away from the corresponding inclined guide surface, a guide surface is provided on the side of the guide portion away from the corresponding inclined guide surface, a slider base inserted in the dynamic model core is fixedly connected to the support plate, two inclined push surfaces respectively matched with each inclined guide surface one-to-one are provided on the slider base, and a push surface matched with each guide surface one-to-one is provided on the cylinder sleeve.

2. The inner core-pulling injection mold according to claim 1, characterized in that: The length of the guide portion is greater than the length of the forming portion.

3. The inner core-pulling injection mold according to claim 1, characterized in that: A first reset rod is fixedly connected to the movable mold push plate, a second reset rod is fixedly connected to the movable mold core plate, and a first needle plate group cooperating with the first reset rod and a second needle plate group cooperating with the second reset rod are also provided on the side of the support plate away from the movable mold core plate.

4. The inner core-pulling injection mold according to claim 3, characterized in that: The second needle plate group includes a second surface needle plate and a second bottom needle plate fixedly connected to each other, a water transport jacket being sealingly fixedly connected to the second surface needle plate, an end of the water transport jacket away from the second surface needle plate passes through the slider base and is sealingly fixedly connected to the side wall of the tunnel hole away from the second surface needle plate, a cooling hole communicating with the water transport jacket is formed on the side wall of the tunnel hole away from the second surface needle plate, a nozzle pipe sequentially inserted into the water transport jacket and the cooling hole is fixedly connected to the second bottom needle plate, an outer diameter of the nozzle pipe is smaller than an inner diameter of the water transport jacket and the cooling hole, and a gap is formed between the nozzle pipe and the bottom of the cooling hole.

5. The inner core-pulling injection mold according to any one of claims 1 to 4, characterized in that: The piston template is provided with an air intake passage, and a first sealing ring cooperating with the movable mold push plate is provided at one end of the cylinder sleeve facing the movable mold push plate, the first sealing ring covers the inner hole opening of the cylinder sleeve, and a second sealing ring cooperating with the movable mold core is provided on the inner hole wall of the cylinder sleeve, and an air hole respectively connected with the inner hole of the cylinder sleeve and the air intake passage is opened on the cylinder sleeve, and the air hole is located between the second sealing ring and the first sealing ring.

6. The inner core-pulling injection mold according to claim 5, characterized in that: A third sealing ring matched with the slider base is arranged on the inner hole side wall of the moving model core.

7. The inner core-pulling injection mold according to claim 5, characterized in that: An annular air groove is provided on the outer side wall of the cylinder sleeve, the air hole is provided at the bottom of the annular air groove, and the cylinder sleeve is provided with fourth sealing rings at positions on both sides of the annular air groove.

8. The inner core-pulling injection mold according to any one of claims 1 to 4, characterized in that: An annular water groove is provided on the outer side wall of the push plate cavity sleeve and / or the dynamic mold core, and a fifth sealing ring is provided on both sides of the annular water groove.

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