Upper mold core-pulling needle structure of injection mold

Abstract

The invention discloses an injection mold upper mold core-pulling needle structure, which comprises an upper code template, the interior of the upper code template comprises two groups of oil cylinders, a core-pulling needle bottom plate, a core-pulling needle fixing plate and a core-pulling needle, the two groups of oil cylinders are arranged on the two sides of the inner side of the upper code template, 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 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 enable the core-pulling needle to press a product through the oil cylinder, after the product is subjected to plastic coating of an internal rubber part, the oil cylinder is used for driving the core-pulling needle structure to retreat, and filled materials are all 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] The invention relates to the technical field of injection molds, in particular to an injection mold upper mold core pulling pin structure. Background Art

[0002] Injection molds are tools for producing plastic products; they are also tools that give plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of certain parts with complex shapes. Specifically, it refers to the process of injecting heated and melted plastic into the mold cavity under high pressure by an injection molding machine, and then cooling and solidifying to obtain a molded product. When injection molding products with holes, it is necessary to set a core inside the molding cavity, and remove it through a core-pulling device before the product is taken out;

[0003] When existing products are undergoing mold closing and injection molding, it is necessary to use a needle to press down the plastic parts inside the overmolded product. However, the positioning of the product by the inserting needle will cause a hole to be formed in the product. When the product is exposed for a long time, water will seep into the hole, causing the function of the injected plastic parts to malfunction, thus affecting the overall performance and quality of the injection molded product. Summary of the invention

[0004] The object of the present invention is to provide a core pulling pin structure for an injection mold to solve the related problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an injection mold upper mold core pulling pin structure, comprising an upper code template, the interior of the upper code template comprises an oil cylinder, a core pulling pin bottom plate, a core pulling pin fixing plate and a core pulling pin, the oil cylinder is provided with two groups, the two groups of oil cylinders are installed on both sides of the inner side of the upper code template, the output ends of the two groups of oil cylinders are connected to the core pulling pin bottom plate and the core pulling pin fixing plate, and multiple groups of core pulling pins are installed inside the core pulling pin fixing plate;

[0006] An upper mold fixing plate is installed at the bottom of the upper code template, a lower mold fixing plate for closing the mold is provided at the bottom of the upper mold fixing plate, and a product body is injection-molded between the lower mold fixing plate and the upper mold fixing plate, and a positioning mechanism is provided inside the upper mold fixing plate.

[0007] Preferably, the positioning mechanism is provided with multiple groups, wherein each group of positioning mechanism includes guide grooves, guide rods, springs, positioning cylinders, pressure plates, conical guide holes and limit rings, guide rods are installed on both sides of the guide grooves, and the outer sides of the two groups of guide rods are respectively provided with slidingly fitting positioning cylinders and springs elastically connected to the guide grooves, a pressure plate is installed at the bottom of the positioning cylinder, the limit ring is installed on the outer side of the core pulling needle, and 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 needle comprises an extension section, the bottom end of the extension section of the outer side of the core pulling needle extends to the inner side of the positioning tube, and the top end of the extension section of the outer side of the core pulling needle is a conical structure.

[0009] Preferably, the core pulling needle bottom plate, the core pulling needle fixing plate and the core pulling needles are lifted and lowered synchronously, and the multiple groups of core pulling needles are respectively opposite to the vertical surfaces of the guide grooves.

[0010] Preferably, the upper mold fixing plate and the lower mold fixing plate are molded together to form an injection cavity therebetween, and a product body is molded 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 which is interconnected.

[0012] Preferably, two sides of the top of the product body are respectively opposite to the vertical planes of two groups of core-pulling needles and positioning cylinders, and every two groups of core-pulling needles and positioning cylinders are in contact with the product body for positioning.

[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 and the top end of the guide groove are in contact with each other and sealed.

[0014] Preferably, an extension groove is provided at the middle position of the top of the positioning cylinder, and the extension groove and the core-pulling needle are inserted and positioned, and guide holes are provided on both sides of the interior of the positioning cylinder, and the guide holes are lifted and slid on the outside of the guide rod.

[0015] Preferably, a through opening is provided at the bottom of the guide groove, the positioning cylinder rises and falls and slides inside the through opening, and a heat-resistant film layer is provided on the outer side of the pressing plate.

[0016] Compared with the prior art, the present invention provides an injection mold upper mold core pulling pin structure, which has the following beneficial effects:

[0017] Through the structural adjustment of the upper mold core pulling needle, it is convenient to use the oil cylinder to respectively make the core pulling needle bottom plate and the core pulling needle fixing plate to press the core pulling needle and the product, so that after the product is plastic-wrapped with internal plastic parts, the oil cylinder is used to drive the core pulling needle structure to retreat, so that the filled material is completely sealed in the internal plastic parts, thereby abandoning the structural opening and structural positioning of redundant channels in the injection molding process of existing products, so that the product is isolated from the outside during use, and external water is prevented from seeping into the channel and affecting the product's performance. At the same time, with the structural cooperation of the positioning mechanism, it can be combined with the lifting and adjusting core pulling needle, and the product is positioned by lifting and lowering the positioning cylinder and the pressure plate, thereby realizing a more stable product fixing method, avoiding the bottom end of the core pulling needle from causing indentations on the product surface, which not only improves the appearance quality of the product surface injection molding, but also protects the main structure of the core pulling needle and extends the adjustment stroke of the core pulling needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of the injection mold of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of the core-pulling pin of the injection mold of the present invention;

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

[0021] In the figure: 1. Upper coding template; 2. Oil cylinder; 3. Core pulling needle bottom plate; 4. Core pulling needle fixing plate; 5. Core pulling needle; 6. Upper mold fixing plate; 7. Product body; 8. Positioning mechanism; 81. Guide groove; 82. Guide rod; 83. Spring; 84. Positioning cylinder; 85. Press plate; 86. Conical guide hole; 87. Limit ring. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-3 The present invention provides a technical solution: a core pulling needle structure of an upper mold of an injection mold, comprising an upper code template 1, wherein the interior of the upper code template 1 comprises an oil cylinder 2, a core pulling needle bottom plate 3, a core pulling needle fixing plate 4 and a core pulling needle 5, wherein two groups of oil cylinders 2 are provided, and the two groups of oil cylinders 2 are installed on both sides of the inner side of the upper code template 1, and the output ends of the two groups of oil cylinders 2 are connected to the core pulling needle bottom plate 3 and the core pulling needle fixing plate 4, and multiple groups of core pulling needles 5 are installed inside the core pulling needle fixing plate 4;

[0024] An upper mold fixing plate 6 is installed at the bottom of the upper code template 1, a lower mold fixing plate for closing the mold is provided at the bottom of the upper mold fixing plate 6, and a product body 7 is injection-molded between the lower mold fixing plate and the upper mold fixing plate 6, and a positioning mechanism 8 is provided inside the upper mold fixing plate 6.

[0025] As a preferred solution of this embodiment: the positioning mechanism 8 is provided with multiple groups, wherein each group 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 conical guide hole 86 and a limiting ring 87, guide rods 82 are installed on both sides of the inside of the guide groove 81, and the outer sides of the two groups of guide rods 82 are respectively provided with a sliding positioning cylinder 84 and a spring 83 elastically connected to the guide groove 81, a pressure plate 85 is installed at the bottom of the positioning cylinder 84, and the limiting ring 87 is installed on the outside of the core pulling needle 5, and the bottom end of the core pulling needle 5 extends to the inner side of the positioning cylinder 84.

[0026] As a preferred solution of this embodiment: the bottom end of the outer side of the core pulling needle 5 includes an extension section, the bottom end of the outer extension section of the core pulling needle 5 extends to the inner side of the positioning tube 84, and the top end of the outer extension section of the core pulling needle 5 is a conical structure. The extension section and the conical structure are arranged in coordination to facilitate the calibration and positioning of the core pulling needle 5 and extend it to the inner side of the positioning tube 84 for pre-combination. After that, under the action of pressure, the core pulling needle 5 and the positioning tube 84 structure can be pressed down to position the product.

[0027] As a preferred solution of this embodiment: the core pulling needle base plate 3, the core pulling needle fixing plate 4 and the core pulling needle 5 are lifted and lowered synchronously, and multiple groups of core pulling needles 5 are respectively opposite to the vertical surfaces of the guide groove 81. Through the relative cooperation of the vertical surfaces of the structure, the core pulling needles are extended into the guide groove 81, and are pressed down by contact with the positioning cylinder 84, and the surface of the product is fixed by pressure, thereby abandoning the defect of the channel in the product caused by the existing insertion method of the needle.

[0028] As a preferred solution of this embodiment: the upper mold fixing plate 6 and the lower mold fixing plate are molded together to form an injection cavity, and a product body 7 is molded in the injection cavity, so that after the mold is closed, the product body 7 is positioned to perform injection molding of the plastic-coated rubber part.

[0029] As a preferred solution of this 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 injection molding of the product by utilizing the connection between the hot melt glue gun and the injection port.

[0030] As a preferred solution of this embodiment: the two sides of the top of the product body 7 are respectively opposite to the vertical planes of the two groups of core pulling needles 5 and the positioning cylinders 84, and every two groups of core pulling needles 5 and the positioning cylinders 84 are in contact with the product body 7 for positioning, and the position of the product body 7 is fixed by the pressure positioning structure of every two groups of core pulling needles 5 and the positioning cylinders 84, so that the product can obtain more stable processing operations.

[0031] As a preferred solution of this 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 and the top of the guide groove 81 are in contact with each other and sealed. Through the setting of the positioning plate, it is convenient to limit the downward position of the core pulling needle 5 to avoid the defect of excessive pressure causing the product to penetrate and form a channel.

[0032] As a preferred solution of this embodiment: an extension groove is opened in the middle position of the top of the positioning cylinder 84, and the extension groove is inserted into the core-pulling needle 5 for positioning, guide holes are opened on both sides of the inside of the positioning cylinder 84, and the guide holes can rise and fall and slide on the outside of the guide rod 82, thereby increasing the stability and guidance of the lifting and lowering adjustment of the positioning cylinder 84 and improving the positioning effect of the product.

[0033] As a preferred solution of this embodiment: a through opening is provided at the bottom of the guide groove 81 , the positioning cylinder 84 is lifted and slid inside the through opening, and a heat-resistant film layer is provided on the outer side of the pressing plate 85 .

[0034] Embodiment 1, as Figure 1-3 As shown, by setting a positioning mechanism 8 opposite to the vertical surface of the core pulling needle 5, when the core pulling needle 5 descends, the extended section of the bottom surface of the core pulling needle 5 is automatically calibrated under the opening of the tapered guide hole 86, and the core pulling needle 5 is extended to the inner side of the positioning cylinder 84 for assembly and splicing, and then the positioning cylinder 84 replaces the core pulling structure, so that 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 needle 5, and the positioning cylinder 84 drives the two groups of springs 83 to be elastically compressed, so that the two groups of positioning cylinders 84 and the pressure plate 85 are used to fix the top position of the product body 7, and avoid the formation of indentations and through holes on the surface of the product body 7, so that the positioning of the structure is stable and flawless, and when the core pulling needle 5 rises vertically, the positioning cylinder 84 is automatically reset under the guidance of the elastic restoring force of the spring 83 connected to the positioning cylinder 84 and the guide rod 82, so as to release the fitting positioning of the pressure plate 85 on the product body 7, so that the filled material can be evenly and comprehensively sealed in the internal rubber parts.

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

[0036] When the core pulling needle structure in the mold frame is working, the upper code template 1 and the upper mold fixing plate 6 are first molded with the lower mold fixing plate, and the two groups of oil cylinders 2 are driven to drive the core pulling needle bottom plate 3 and the core pulling needle fixing plate 4 to push the core pulling needle 5 down, so that the bottom end of the core pulling needle 5 extends to the inside of the positioning cylinder 84, so that the positioning cylinder 84 is lowered to force the pressure plate 85 to contact the surface of the product body 7, thereby pressing the product body 7 to position, and after the product body 7 is plastic-coated with internal plastic parts, the two groups of oil cylinders 2 are driven to drive the oil cylinder 2 and the core pulling needle bottom plate 3 to reset, cancel the positioning pressure of the core pulling needle 5 and the positioning cylinder 84 on the product surface, and cause the material filled between the upper mold fixing plate 6 and the lower mold fixing plate to be completely sealed in the internal plastic parts, so that the surface of the injection molded product is smooth, and indentations on the product surface and the opening of redundant channels are avoided, so as to utilize the isolation characteristics of the product from the outside during use and improve the waterproof protection of the product during use.

[0037] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A core pulling pin structure for an injection mold upper mold, comprising an upper code template (1), characterized in that: The interior of the upper code template (1) includes an oil cylinder (2), a core pulling needle bottom plate (3), a core pulling needle fixing plate (4) and a core pulling needle (5). The oil cylinder (2) is provided with two groups in total. The two groups 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 groups of oil cylinders (2) are connected to the core pulling needle bottom plate (3) and the core pulling needle fixing plate (4). Multiple groups of core pulling needles (5) are installed inside the core pulling needle fixing plate (4); An upper mold fixing plate (6) is installed at the bottom of the upper code template (1), a lower mold fixing plate for closing the mold is provided at the bottom of the upper mold fixing plate (6), a product body (7) is injection molded between the lower mold fixing plate and the upper mold fixing plate (6), and a positioning mechanism (8) is provided inside the upper mold fixing plate (6).

2. The core pulling pin structure of the upper mold of the injection mold according to claim 1, characterized in that: The positioning mechanism (8) is provided with a plurality of groups, wherein each group of the positioning mechanism (8) comprises a guide groove (81), a guide rod (82), a spring (83), a positioning cylinder (84), a pressure plate (85), a conical guide hole (86) and a limiting ring (87); guide rods (82) are installed on both sides of the inside of the guide groove (81); the outer sides of the two groups of guide rods (82) are respectively provided with a slidably matched positioning cylinder (84) and a spring (83) elastically connected to the guide groove (81); a 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); and 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 of the injection mold according to claim 1, characterized in that: The bottom end of the outer side of the core-pulling needle (5) comprises an extension section, the bottom end of the outer extension section of the core-pulling needle (5) extends to the inner side of the positioning cylinder (84), and the top end of the outer extension section of the core-pulling needle (5) is a conical structure.

4. The core pulling pin structure of the injection mold according to claim 1, characterized in that: The core pulling needle bottom plate (3) and the core pulling needle fixing plate (4) and the core pulling needle (5) are synchronously lifted and lowered, and a plurality of groups of the core pulling needles (5) are respectively opposite to the vertical surfaces of the guide grooves (81).

5. The core pulling pin structure of the injection mold according to claim 1, characterized in that: The upper mold fixing plate (6) and the lower mold fixing plate are molded together to form an injection cavity therebetween, and a product body (7) is molded in the injection cavity.

6. The core pulling pin structure of the upper mold of the injection mold according to claim 5, characterized in that: 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 which is interconnected.

7. The core pulling pin structure of the upper mold of the injection mold according to claim 1, characterized in that: The two sides of the top of the product body (7) are respectively vertically opposed to two groups of core-pulling needles (5) and positioning cylinders (84), and every two groups of core-pulling needles (5) and positioning cylinders (84) are in contact with the product body (7) for positioning.

8. The core pulling pin structure of the upper mold of the injection mold according to claim 1, characterized in that: 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 and the top of the guide groove (81) are in contact with each other and are in sealing cooperation.

9. The core pulling pin structure of the 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 into the core-pulling needle (5) for positioning. Guide holes are provided on both sides of the interior of the positioning cylinder (84), and the guide holes are lifted and slid on the outside of the guide rod (82).

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

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