Injection mold with long-stroke demolding function

Abstract

The utility model discloses a long-stroke demoulding injection mould, which comprises an upper mould base, a lower mould base, an upper mould plate, a lower mould plate, an ejector plate, a front mould and a rear mould, the front mould is fixed on the upper mould base, the rear mould is fixed on the lower mould plate, gaps are arranged among the front mould, the rear mould, the upper mould plate and the lower mould plate to form a cavity for forming a product, the ejector plate is arranged on the lower mould base, and the ejector plate is arranged on the lower mould base. A plurality of limiting rods are fixed to the periphery of the bottom of the upper die base, limiting heads are arranged at the ends of the limiting rods, through holes are formed in the upper die plate, steps are arranged in the through holes, the limiting rods are inserted into the upper die plate from the bottom of the upper die plate, and the ends, away from the limiting heads, of the limiting rods are fixed to the bottom of the upper die base. When the mold is opened, the limiting rod is pulled to move upwards firstly, when the limiting head abuts against the step, the upper mold base drives the upper mold plate to move upwards to open the mold, the front mold and the upper mold plate are opened in a segmented mode, the risk that a product is torn during mold opening is reduced, and the injection molding quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, and particularly relates to an injection mold with long-stroke demolding. Background Art

[0002] Injection molding technology occupies an important position in modern manufacturing and is widely used in the production of various plastic products. As an important tool for injection molding, the design and performance of injection molds directly affect the quality and production efficiency of products.

[0003] During the injection molding process, the design and structure of the mold are crucial for the quality and production efficiency of the finished product. Traditional injection molds usually consist of an upper mold base, a lower mold base, an upper template, a lower template, a front mold, and a rear mold. However, traditional injection molds often encounter problems with difficult product demolding during the mold opening process, especially for products with complex structures. It is more likely to occur that the inner wall of the product adheres to the front mold and the outer wall of the product adheres to the upper template. This adhesion will cause defects such as tearing and deformation of the product during demolding, affecting the product quality and even possibly resulting in product scrapping.

[0004] Most of the existing injection molds on the market currently adopt a one-time mold opening design, that is, the front mold and the upper template are separated simultaneously during the mold opening process. This design exacerbates the stress concentration during product demolding to a certain extent and increases the risk of product tearing. In addition, the structural design of traditional molds is relatively complex, with high manufacturing costs, short service life, and inconvenient maintenance, which affects the production efficiency. Summary of the Utility Model

[0005] To solve the above problems, the utility model provides an injection mold with long-stroke demolding.

[0006] The technical solution provided by the utility model is as follows:

[0007] An injection mold with long-stroke demolding, comprising an upper mold base, a lower mold base, an upper template, a lower template, an ejector plate, a front mold, and a rear mold;

[0008] The front mold is fixed on the upper mold base, the rear mold is fixed on the lower template, and a cavity is formed by a gap between the front mold, the rear mold, the upper template, and the lower template for molding the product;

[0009] The ejector plate is arranged on the lower mold base, and ejector pins are arranged on the ejector plate for ejecting the product;

[0010] A number of limit rods are fixed around the bottom of the upper mold base, and limit heads are arranged at the ends of the limit rods. Through holes are opened on the upper template, and steps are arranged in the through holes. The limit rods are inserted into the upper template from the bottom of the upper template, and the end of the limit rod far from the limit head is fixed on the bottom of the upper mold base. When the upper mold base moves upward, the limit rods are first pulled upward. When the limit head abuts against the step, the upper mold base drives the upper template to move upward to open the mold.

[0011] In some embodiments, a fixing block is fixed to the bottom of the upper die base. A sunk groove is provided on the upper surface of the fixing block, and the front mold is fitted and fixed in the sunk groove.

[0012] In some embodiments, a backing plate is provided below the lower template.

[0013] In some embodiments, two front molds are provided and two rear molds are provided for forming two finished products.

[0014] In summary, the beneficial effects of the present utility model are as follows:

[0015] In the present utility model, the front mold and the upper template are separated from the mold in segments. First, the front mold is separated from the inner wall of the product, and then the upper template is separated from the outer wall of the product, reducing the risk of product tearing during mold opening and improving the injection molding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic cross-sectional structure diagram of the present utility model;

[0017] Figure 2 is a schematic cross-sectional structure diagram of the present utility model from another perspective;

[0018] Figure 3 is a schematic installation diagram of the front mold of the present utility model;

[0019] Figure 4 is a schematic structure diagram of the fixing block of the present utility model;

[0020] Figure 5 is a schematic structure diagram of the product of the present utility model.

[0021] The reference numerals are as follows:

[0022] 1. Upper die base; 2. Lower die base; 3. Upper template; 4. Lower template; 5. Backing plate; 6. Ejector plate; 7. Front mold; 8. Rear mold; 9. Product; 10. Limit rod; 11. Limit head; 12. Through hole; 13. Step; 14. Ejector pin; 15. Fixing block; 16. Sunk groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to deepen the understanding of the present utility model, the present utility model will be further described in detail below in conjunction with the embodiments and the drawings. The embodiments are only used to explain the present utility model and do not limit the protection scope of the present utility model.

[0024] As Figures 1-5 , shown, this embodiment provides an injection mold with long-stroke demolding, including an upper die base 1, a lower die base 2, an upper template 3, a lower template 4, a backing plate 5, an ejector plate 6, a front mold 7 and a rear mold 8.

[0025] Among them, the front mold 7 is fixed on the upper mold base 1, and the rear mold 8 is fixed on the lower template 4. There are gaps between the front mold 7, the rear mold 8, the upper template 3, and the lower template 4 to form a cavity. Plastic enters the cavity from the injection port to form the molded product 9. In this embodiment, there are two front molds 7 arranged side by side, and correspondingly two rear molds 8 are provided for forming two products 9.

[0026] Please refer to Figure 1 , the front mold 7 of the product is relatively long, and the upper part of the molded product 9 is relatively deep. Therefore, if the product is directly ejected by the ejector pin 14 after mold opening, it is easy to damage the product. Since the contact area between the front mold 7 and the upper template 3 and the product 9 is relatively large, it is easy to tear the upper part of the product 9 during mold opening.

[0027] The ejector pin plate 6 is arranged to move up and down on the lower mold base 2 and is pushed by the oil cylinder at the bottom to move up and down. The ejector pin plate 6 is provided with ejector pins 14. The ejector pins 14 move up and down with the ejector pin plate 6 and eject the product 9 after mold opening. The backing plate 5 is arranged below the lower template 4 to limit the stroke of the ejector pin plate 6.

[0028] A number of limit rods 10 are fixed around the bottom of the upper mold base 1. The end of the limit rod 10 is provided with a limit head 11. A through hole 12 is opened on the upper template 3, and a step 13 is provided in the through hole 12. The step 13 is used to block the limit head 11 so that it cannot move up further. The limit rod 10 is inserted into the upper template 3 from the bottom of the upper template 3, and the end of the limit rod 10 away from the limit head 11 is fixed to the bottom of the upper mold base 1.

[0029] When the upper mold base 1 moves up, it first pulls the limit rod 10 up. When the limit head 11 abuts against the step 13, the upper mold base 1 drives the upper template 3 to move up to open the mold.

[0030] Furthermore, a fixed block 15 is fixed to the bottom of the upper mold base 1. A sunk groove 16 is provided on the upper surface of the fixed block 15. The front mold 7 passes through the fixed block 15 and is fixedly fitted in the sunk groove 16. The front mold 7 is detachably fixed to the upper mold base 1 and moves with the upper mold base 1.

[0031] When the mold of this embodiment is opened, first, the upper mold base 1 moves up. The upper mold base 1 drives the front mold 7 and the limit rod 10 to move up, so that the product 9 is first separated from the front mold 7. After the upper mold base 1 moves up a certain distance, the inner wall of the product 9 has been separated from the front mold 7. At the same time, the limit head 11 moves up to the step 13 and abuts against the bottom of the step 13. At this time, the limit rod 10 can pull the upper template 3 to move up, that is, separate the upper template 3 from the outer wall of the product 9 to complete the mold opening action.

[0032] After the mold opening is completed, then start the oil cylinder at the bottom of the ejector pin plate 6 to push the ejector pin 14 to eject the product 9 to complete the demolding of the product 9.

[0033] It should be noted that in the accompanying drawings or the main body of the specification, the implementation manners that are not depicted or described are all forms known to those of ordinary skill in the art, and no detailed description is provided. In addition, the above definitions of each component and method are not limited to the specific structures, shapes or manners mentioned in the embodiments.

[0034] It should also be noted that this document may provide examples of parameters including specific values, but these parameters do not necessarily have to be exactly equal to the corresponding values, but may approximate the corresponding values within an acceptable error tolerance or design constraint. The directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., are only references to the directions in the accompanying drawings and are not used to limit the protection scope of this application.

[0035] The above description shows and describes the preferred embodiments of the present invention. As mentioned above, it should be understood that the present invention is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the techniques or knowledge in related fields. And any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the protection scope of the appended claims of the present invention.

Claims

1. An injection mold with long-stroke demoulding, characterized in that: It comprises an upper die base (1), a lower die base (2), an upper die plate (3), a lower die plate (4), an ejector plate (6), a front die (7) and a rear die (8); The front mold (7) is fixed on the upper mold base (1), the rear mold (8) is fixed on the lower mold plate (4), and a gap is provided between the front mold (7), the rear mold (8), the upper mold plate (3) and the lower mold plate (4) to form a mold cavity for molding a product (9); The ejector plate (6) is arranged on the lower die base (2), and an ejector (14) is provided on the ejector plate (6) for ejecting the product (9); A plurality of limit rods (10) are fixed around the bottom of the upper die seat (1), and a limit head (11) is provided at the end of the limit rod (10). A through hole (12) is opened on the upper die plate (3), and a step (13) is provided in the through hole (12). The limit rod (10) is inserted into the upper die plate (3) from the bottom of the upper die plate (3), and one end of the limit rod (10) away from the limit head (11) is fixed to the bottom of the upper die seat (1). When the upper die seat (1) moves upward, the limit rod (10) is first pulled upward, and when the limit head (11) conflicts with the step (13), the upper die seat (1) drives the upper die plate (3) to move upward to open the die.

2. The long-stroke demoulding injection mold according to claim 1, characterized in that: A fixing block (15) is fixed at the bottom of the upper die seat (1), a recessed groove (16) is provided on the upper surface of the fixing block (15), and the front die (7) is embedded and fixed in the recessed groove (16).

3. The long-stroke demoulding injection mold according to claim 1, characterized in that: A pad (5) is provided below the lower template (4).

4. The long-stroke demoulding injection mold according to claim 2, characterized in that: Two front molds (7) are provided, and two rear molds (8) are provided, for producing two finished products (9).

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