Upper mold core-pulling needle structure of injection mold

Abstract

The utility model discloses an upper mold core-pulling needle structure of an injection mold, which comprises an upper stacking mold plate, two groups of oil cylinders, a core-pulling needle bottom plate, a core-pulling needle fixing plate and a core-pulling needle are arranged in the upper stacking mold plate, the two groups of oil cylinders are arranged on two sides of the inner side of the upper stacking mold plate, and the core-pulling needle bottom plate is arranged on the core-pulling needle fixing plate. The output ends of the two groups of oil cylinders are connected with a core-pulling needle bottom plate and a core-pulling needle fixing plate; a plurality of groups of core-pulling needles are mounted in the core-pulling needle fixing plate; through the structural adjustment of the upper mold core-pulling needle, the core-pulling needle bottom plate and the core-pulling needle fixing plate are convenient to respectively enable the core-pulling needle and a product to be pressed through the oil cylinder, the oil cylinder is used for driving the core-pulling needle structure to retreat after the product is coated with an internal rubber part, and filled materials are completely sealed in the internal rubber part; therefore, structural arrangement and structural positioning of redundant pore channels in the injection molding process of an existing product are abandoned, the product is isolated from the outside in the using process, and external water is prevented from permeating into the pore channels to affect the using performance of the product.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a core-pulling pin structure for the upper mold of an injection mold. Background Technology

[0002] Injection molds are tools for producing plastic products; they are also tools for giving plastic products a complete structure and precise dimensions. Injection molding is a processing method used for mass production of certain complex-shaped parts. Specifically, it refers to injecting heated and molten plastic into the mold cavity under high pressure by an injection molding machine, and after cooling and solidification, obtaining the molded product. When injection molding products with holes, a core needs to be set inside the molding cavity, and the core is removed by a core-pulling device before the product is taken out.

[0003] In existing products, during the injection molding process, needles are used to press down on the plastic parts inside the molded parts. However, the positioning of the needles in the product can cause holes to form inside the product. When the product is exposed for a long time, water can seep into the holes, causing abnormal function of the injection-molded plastic parts and affecting the overall performance and quality of the injection-molded products. Utility Model Content

[0004] The purpose of this utility model is to provide a core-pulling pin structure for the upper mold of an injection mold to solve the related problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a core-pulling pin structure for an injection mold upper mold, comprising an upper mold plate, wherein the upper mold plate includes an oil cylinder, a core-pulling pin base plate, a core-pulling pin fixing plate, and a core-pulling pin. Two sets of oil cylinders are provided, and the two sets of oil cylinders are installed on both sides of the inner side of the upper mold plate. The output ends of the two sets of oil cylinders are connected to the core-pulling pin base plate and the core-pulling pin fixing plate. Multiple sets of core-pulling pins are installed inside the core-pulling pin fixing plate.

[0006] The bottom of the upper mold template is equipped with an upper mold fixing plate, and the bottom of the upper mold fixing plate is provided with a lower mold fixing plate for mold closing. The product body is injection molded between the lower mold fixing plate and the upper mold fixing plate. The upper mold fixing plate is provided with a positioning mechanism inside.

[0007] Preferably, the positioning mechanism is provided in multiple sets, wherein each set of positioning mechanism includes a guide groove, a guide rod, a spring, a positioning cylinder, a pressure plate, a tapered guide hole and a limiting ring. The guide rod is installed on both sides inside the guide groove. The outer sides of the two sets of guide rods are respectively provided with a slidingly fitted positioning cylinder and a spring elastically connected to the guide groove. The bottom of the positioning cylinder is installed with a pressure plate. The limiting ring is installed on the outer side of the core-pulling needle. The bottom end of the core-pulling needle extends to the inner side of the positioning cylinder.

[0008] Preferably, the bottom end of the outer side of the core-pulling pin includes an extension section, the bottom end of the extension section of the outer side of the core-pulling pin extends to the inner side of the positioning cylinder, and the top end of the extension section of the outer side of the core-pulling pin has a tapered structure.

[0009] Preferably, the core-pulling pin base plate, the core-pulling pin fixing plate, and the core-pulling pin move up and down synchronously, and the multiple sets of core-pulling pins are respectively opposite to the vertical plane of the guide groove.

[0010] Preferably, the upper mold fixing plate and the lower mold fixing plate are closed to form an injection cavity, and the main body of the product is formed in the injection cavity.

[0011] Preferably, an injection port is provided on one side of the injection cavity between the upper mold fixing plate and the lower mold fixing plate, and the injection port is provided with a hot melt glue gun that is interconnected with the injection port.

[0012] Preferably, the two sides of the top of the product body are respectively opposite to the vertical planes of two sets of core-pulling pins and positioning cylinders, and each pair of core-pulling pins and positioning cylinders contacts and positions the product body.

[0013] Preferably, a positioning plate is provided on the outer side of the core-pulling needle near the top of the limiting ring, and the positioning plate is in contact with and sealed to the top of the guide groove.

[0014] Preferably, an extension groove is provided at the middle position of the top of the positioning cylinder, and the extension groove is inserted and positioned with the core-pulling pin. Guide holes are provided on both sides inside the positioning cylinder, and the guide holes slide up and down on the outside of the guide rod.

[0015] Preferably, the bottom of the guide groove has an opening, the positioning cylinder slides up and down inside the opening, and the outer side of the pressure plate is provided with a heat-resistant film layer.

[0016] Compared with the prior art, this utility model provides a core-pulling pin structure for the upper mold of an injection mold, which has the following beneficial effects:

[0017] By adjusting the structure of the upper mold core-pulling pin, the core-pulling pin base plate and core-pulling pin fixing plate can be pressed together by the hydraulic cylinder. After the product is encapsulated in the internal plastic part, the core-pulling pin structure is driven to retract by the hydraulic cylinder, ensuring that all the filling material is sealed in the internal plastic part. This eliminates the need for additional channels and positioning in the existing product injection molding process, thus isolating the product from the outside during use and preventing external water from seeping into the channels and affecting the product's performance. At the same time, with the cooperation of the positioning mechanism, it can be combined with the lifting and adjusting core-pulling pin, and the product can be positioned by the lifting and lowering of the positioning cylinder and pressure plate, thus achieving a more stable product fixing method. This avoids the bottom end of the core-pulling pin causing indentations on the product surface, not only improving the appearance quality of the injection molded product surface, but also protecting the main structure of the core-pulling pin and extending the adjustment stroke of the core-pulling pin. Attached Figure Description

[0018] Figure 1 This is a perspective view of the injection mold of this utility model;

[0019] Figure 2 This is a schematic diagram of the core-pulling pin structure of the injection mold of this utility model;

[0020] Figure 3 For the present utility model Figure 2 Enlarged view of point A.

[0021] In the diagram: 1. Upper mold template; 2. Hydraulic cylinder; 3. Core-pulling pin base plate; 4. Core-pulling pin fixing plate; 5. Core-pulling pin; 6. Upper mold fixing plate; 7. Product body; 8. Positioning mechanism; 81. Guide groove; 82. Guide rod; 83. Spring; 84. Positioning cylinder; 85. Pressure plate; 86. Tapered guide hole; 87. Limiting ring. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1-3 This utility model provides a technical solution: a core-pulling pin structure for an injection mold upper mold, including an upper template 1. The upper template 1 includes an oil cylinder 2, a core-pulling pin base plate 3, a core-pulling pin fixing plate 4, and core-pulling pins 5 inside. There are two sets of oil cylinders 2, which are installed on both sides of the inner side of the upper template 1. The output ends of the two sets of oil cylinders 2 are connected to the core-pulling pin base plate 3 and the core-pulling pin fixing plate 4. Multiple sets of core-pulling pins 5 are installed inside the core-pulling pin fixing plate 4.

[0024] The bottom of the upper mold template 1 is equipped with an upper mold fixing plate 6, and the bottom of the upper mold fixing plate 6 is provided with a lower mold fixing plate for mold closing. The product body 7 is injection molded between the lower mold fixing plate and the upper mold fixing plate 6. The upper mold fixing plate 6 is provided with a positioning mechanism 8 inside.

[0025] As a preferred embodiment, the positioning mechanism 8 is provided in multiple sets, wherein each set of positioning mechanism 8 includes a guide groove 81, a guide rod 82, a spring 83, a positioning cylinder 84, a pressure plate 85, a tapered guide hole 86, and a limiting ring 87. The guide rod 82 is installed on both sides inside the guide groove 81. The outer sides of the two sets of guide rods 82 are respectively provided with a slidingly fitted positioning cylinder 84 and a spring 83 elastically connected to the guide groove 81. The pressure plate 85 is installed at the bottom of the positioning cylinder 84. The limiting ring 87 is installed on the outer side of the core-pulling needle 5. The bottom end of the core-pulling needle 5 extends to the inner side of the positioning cylinder 84.

[0026] As a preferred embodiment, the bottom of the outer side of the core-pulling pin 5 includes an extension section. The bottom of the extension section of the outer side of the core-pulling pin 5 extends to the inner side of the positioning cylinder 84. The top of the extension section of the outer side of the core-pulling pin 5 is a conical structure. By using the combination of the extension section and the conical structure, it is easy to calibrate and position the core-pulling pin 5 and pre-assemble it with the inner side of the positioning cylinder 84. Then, under pressure, the core-pulling pin 5 and the positioning cylinder 84 structure are pressed down to position the product.

[0027] As a preferred embodiment, the core-pulling pin base plate 3, the core-pulling pin fixing plate 4, and the core-pulling pin 5 move up and down synchronously. Multiple sets of core-pulling pins 5 are respectively opposite to the vertical surface of the guide groove 81. Through the relative cooperation of the vertical surfaces of the structure, the core-pulling pin extends into the guide groove 81 and is pressed down by contact with the positioning cylinder 84. The pressure is used to fix the product surface, thus eliminating the defect of holes in the product caused by the insertion method of the existing pin insert.

[0028] As a preferred embodiment, the upper mold fixing plate 6 and the lower mold fixing plate are closed to form an injection cavity, and the product body 7 is formed in the injection cavity, which facilitates the injection molding of plastic parts by positioning the product body 7 after the mold is closed.

[0029] As a preferred embodiment, an injection port is provided on one side of the injection cavity between the upper mold fixing plate 6 and the lower mold fixing plate, and the injection port is provided with a hot melt glue gun that is interconnected, so as to facilitate the injection molding of the product by using the connection between the hot melt glue gun and the injection port.

[0030] As a preferred embodiment, the top two sides of the product body 7 are respectively opposite to the vertical surfaces of two sets of core-pulling pins 5 and positioning cylinders 84. Each pair of core-pulling pins 5 and positioning cylinders 84 are in contact with the product body 7 for positioning. The pressure positioning structure of each pair of core-pulling pins 5 and positioning cylinders 84 is used to fix the position of the product body 7 so as to allow the product to undergo more stable processing operations.

[0031] As a preferred embodiment, a positioning plate is provided on the outer side of the core-pulling needle 5 near the top of the limiting ring 87, and the positioning plate is in contact with and sealed to the top of the guide groove 81. The positioning plate helps to limit the downward pressure position of the core-pulling needle 5, avoiding excessive pressure from causing the product to form a through-hole defect.

[0032] As a preferred embodiment, an extension groove is provided at the middle position of the top of the positioning cylinder 84, and the extension groove is inserted and positioned with the core-pulling pin 5. Guide holes are provided on both sides inside the positioning cylinder 84, and the guide holes slide up and down on the outside of the guide rod 82, which increases the stability and guidance of the lifting adjustment of the positioning cylinder 84 and improves the positioning effect of the product.

[0033] As a preferred embodiment, the bottom of the guide groove 81 has an opening, the positioning cylinder 84 slides up and down inside the opening, and the outer side of the pressure plate 85 is provided with a heat-resistant film layer.

[0034] Example 1, such as Figure 1-3 As shown, by setting a positioning mechanism 8 opposite to the vertical plane of the core-pulling pin 5, when the core-pulling pin 5 descends, the extension section of the bottom surface of the core-pulling pin 5 is automatically aligned under the opening of the tapered guide hole 86, and the core-pulling pin 5 extends to the inner side of the positioning cylinder 84 for assembly. Then, the positioning cylinder 84 replaces the core-pulling structure, and the positioning cylinder 84 drives the pressure plate 85 to contact the surface of the product body 7 with the downward pressure of the core-pulling pin 5. The positioning cylinder 84 drives the two sets of springs 83 to compress elastically, thereby using the two sets of positioning cylinders 84 and pressure plate 85 to fix the top position of the product body 7, and avoids the formation of indentations and through holes on the surface of the product body 7. This makes the positioning of the structure stable and flawless. When the core-pulling pin 5 rises vertically, the positioning cylinder 84 is automatically reset by the elastic restoring force of the spring 83 connected to the positioning cylinder 84 and the guidance of the guide rod 82, so as to release the pressure plate 85 from the product body 7 and allow the filling material to evenly and completely seal the internal rubber parts.

[0035] Working principle: In the upper mold core-pulling pin structure of this injection mold;

[0036] When the core-pulling pin structure inside the mold frame is working, the upper mold plate 1 and the upper mold fixing plate 6 are first closed with the lower mold fixing plate. Driven by two sets of hydraulic cylinders 2, the core-pulling pin base plate 3 and the core-pulling pin fixing plate 4 push the core-pulling pin 5 down, causing the bottom end of the core-pulling pin 5 to extend into the interior of the positioning cylinder 84. This causes the positioning cylinder 84 to descend, forcing the pressure plate 85 to contact the surface of the product body 7, thereby pressing and positioning the product body 7. After the product body 7 is wrapped with plastic parts, driven by the two sets of hydraulic cylinders 2, the hydraulic cylinders 2 and the core-pulling pin base plate 3 are reset, releasing the positioning pressure of the core-pulling pin 5 and the positioning cylinder 84 on the product surface. This causes all the filling material between the upper mold fixing plate 6 and the lower mold fixing plate to be sealed in the internal plastic parts, thus making the surface of the injection molded product smooth and avoiding indentations and the opening of extra channels on the product surface. This allows the product to utilize its isolation characteristics from the outside during use, improving its waterproof protection.

[0037] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A core-pulling pin structure for an upper mold of an injection mold, comprising an upper mold plate (1), characterized in that: The upper code template (1) includes an oil cylinder (2), a core-pulling needle base plate (3), a core-pulling needle fixing plate (4), and a core-pulling needle (5). There are two sets of oil cylinders (2). The two sets of oil cylinders (2) are installed on both sides of the inner side of the upper code template (1). The output ends of the two sets of oil cylinders (2) are connected to the core-pulling needle base plate (3) and the core-pulling needle fixing plate (4). Multiple sets of core-pulling needles (5) are installed inside the core-pulling needle fixing plate (4). The bottom of the upper mold template (1) is equipped with an upper mold fixing plate (6), the bottom of the upper mold fixing plate (6) is provided with a lower mold fixing plate for mold closing, and the product body (7) is injection molded between the lower mold fixing plate and the upper mold fixing plate (6). The upper mold fixing plate (6) is provided with a positioning mechanism (8).

2. The core-pulling pin structure for an upper mold of an injection mold according to claim 1, characterized in that: The positioning mechanism (8) is provided in multiple sets, each set of positioning mechanism (8) includes a guide groove (81), a guide rod (82), a spring (83), a positioning cylinder (84), a pressure plate (85), a tapered guide hole (86) and a limiting ring (87). The guide rod (82) is installed on both sides inside the guide groove (81). The outer sides of the two sets of guide rods (82) are respectively provided with a slidingly fitted positioning cylinder (84) and a spring (83) elastically connected to the guide groove (81). The bottom of the positioning cylinder (84) is installed with a pressure plate (85). The limiting ring (87) is installed on the outer side of the core-pulling needle (5). The bottom end of the core-pulling needle (5) extends to the inner side of the positioning cylinder (84).

3. The core-pulling pin structure for an injection mold upper mold according to claim 1, characterized in that: The bottom end of the outer side of the core-pulling needle (5) includes an extension section, the bottom end of the extension section of the outer side of the core-pulling needle (5) extends to the inner side of the positioning cylinder (84), and the top end of the extension section of the outer side of the core-pulling needle (5) is a conical structure.

4. The core-pulling pin structure for an upper mold of an injection mold according to claim 1, characterized in that: The core-pulling pin base plate (3), the core-pulling pin fixing plate (4), and the core-pulling pin (5) move up and down synchronously, and the multiple sets of core-pulling pins (5) are respectively opposite to the vertical plane of the guide groove (81).

5. The core-pulling pin structure for an upper mold of an injection mold according to claim 1, characterized in that: The upper mold fixing plate (6) and the lower mold fixing plate are closed and form an injection cavity between them, and the product body (7) is formed in the injection cavity.

6. The core-pulling pin structure for an upper mold of an injection mold according to claim 5, characterized in that: The injection cavity between the upper mold fixing plate (6) and the lower mold fixing plate is provided with an injection port on one side, and the injection port is provided with a hot melt glue gun that is connected to each other.

7. The core-pulling pin structure for an upper mold of an injection mold according to claim 1, characterized in that: The top two sides of the product body (7) are respectively opposite to the vertical planes of two sets of core-pulling pins (5) and positioning cylinders (84), and each pair of core-pulling pins (5) and positioning cylinders (84) are in contact with the product body (7) for positioning.

8. The core-pulling pin structure for an upper mold of an injection mold according to claim 1, characterized in that: The outer side of the core-pulling needle (5) is provided with a positioning plate near the top of the limiting ring (87), and the positioning plate is in contact with the top of the guide groove (81) and is sealed together.

9. The core-pulling pin structure for an upper mold of an injection mold according to claim 2, characterized in that: An extension groove is provided at the middle position of the top of the positioning cylinder (84), and the extension groove is inserted and positioned with the core-pulling needle (5). Guide holes are provided on both sides inside the positioning cylinder (84), and the guide holes slide up and down on the outside of the guide rod (82).

10. The core-pulling pin structure for the upper mold of an injection mold according to claim 2, characterized in that: The bottom of the guide groove (81) has an opening, the positioning cylinder (84) slides up and down inside the opening, and the outer side of the pressure plate (85) is provided with a heat-resistant film layer.

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