CN222933239U - Injection mold with long-stroke demolding - Google Patents

Abstract

The utility model discloses an injection mold with a long-stroke demoulding, 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, the front mold is fixed on the upper mold base, the rear mold is fixed on the lower template, a gap is provided between the front mold, the rear mold, the upper template and the lower template to form a cavity for molding products, the ejector plate is arranged on the lower mold base, an ejector plate is provided with an ejector for ejecting products, a plurality of limit rods are fixed around the bottom of the upper mold base, a limit head is provided at the end of the limit rod, a through hole is opened on the upper template, a step is provided in the through hole, the limit rod is inserted into the upper template from the bottom of the upper template, and one end of the limit rod away from the limit head is fixed to the bottom of the upper mold base, when the upper mold base moves upward, the limit rod is first pulled upward, and when the limit head conflicts with the step, the upper mold base drives the upper template to move upward to open the mold, and the front mold and the upper template of the utility model are opened in sections, the risk of product tearing during mold opening is reduced, and the injection molding quality is improved.

Description

Injection mold with long-stroke demolding

Technical Field

The utility model belongs to the technical field of molds, and particularly relates to a long-stroke demolding injection mold.

Background

Injection molding technology plays an important role in modern manufacturing industry and is widely applied to the production of various plastic products. As an important tool for injection molding, the design and performance of the injection mold directly influence the quality and production efficiency of the product.

In the injection molding process, the design and construction of the mold is critical to the quality and production efficiency of the finished product. The conventional injection mold is generally composed of an upper mold base, a lower mold base, an upper mold plate, a lower mold plate, a front mold, a rear mold and the like. However, the conventional injection mold often encounters the problem of difficult demolding of products in the mold opening process, and especially for products with complex structures, the conditions of adhesion between the inner wall of the product and the front mold and adhesion between the outer wall of the product and the upper mold plate are more likely to occur. The adhesion can cause the defects of tearing, deformation and the like of the product during demolding, influence the quality of the product and even possibly lead to scrapping of the product.

Most of existing injection molds in the market at present adopt a one-time mold opening design, namely, a front mold and an upper mold plate are separated simultaneously in the mold opening process. This design exacerbates the stress concentration of the product during demolding to some extent, increasing the risk of tearing of the product. In addition, the structural design of traditional mould is also comparatively complicated, and manufacturing cost is high, and life is short, and maintenance is inconvenient, has influenced production efficiency.

Disclosure of utility model

In order to solve the problems, the utility model provides a long-stroke demolding injection mold.

The technical scheme provided by the utility model is as follows:

an injection mold with long-stroke demolding comprises an upper mold base, a lower mold base, an upper mold plate, a lower mold plate, a pin jacking plate, a front mold and a rear mold;

The front die is fixed on the upper die base, the rear die is fixed on the lower die plate, and a cavity is formed among the front die, the rear die, the upper die plate and the lower die plate and used for forming a product;

the ejector plate is arranged on the lower die holder, and is provided with an ejector pin for ejecting out a product;

A plurality of limiting rods are fixed on the periphery of the bottom of the upper die base, limiting heads are arranged at the end parts of the limiting rods, through holes are formed in the upper die plates, steps are arranged in the through holes, the limiting rods are inserted into the upper die plates from the bottoms of the upper die plates, one ends, far away from the limiting heads, of the limiting rods are fixed at the bottoms of the upper die base, when the upper die base moves upwards, the limiting rods are pulled to move upwards, and when the limiting heads are abutted against the steps, the upper die base drives the upper die plates to move away from the dies.

In some embodiments, a fixed block is fixed at the bottom of the upper die holder, a sinking groove is arranged on the upper surface of the fixed block, and the front die is embedded and fixed in the sinking groove.

In some embodiments, a backing plate is provided below the lower die plate.

In some embodiments, there are two front molds and two rear molds for two products.

In summary, the beneficial effects of the utility model are as follows:

According to the utility model, the front mould and the upper mould plate are opened in a segmented mode, the front mould is separated from the inner wall of the product, and then the upper mould plate is separated from the outer wall of the product, so that the risk of tearing the product during mould opening is reduced, and the injection quality is improved.

Drawings

FIG. 1 is a schematic cross-sectional view of the present utility model;

FIG. 2 is a schematic cross-sectional view of another view of the present utility model;

FIG. 3 is a front mold mounting schematic diagram of the present utility model;

FIG. 4 is a schematic view of a fixed block structure according to the present utility model;

FIG. 5 is a schematic diagram of the structure of the product of the present utility model.

The reference numerals are as follows:

1. The die comprises an upper die holder, a lower die holder, an upper die plate, a lower die plate, a base plate, a pin jacking plate, a front die, a rear die, a product, a limiting rod, a limiting head, a limiting rod, a through hole, a step, a pin jacking plate, a fixing block and a sinking groove.

Detailed Description

The present utility model will be further described in detail with reference to the following examples and drawings for the purpose of enhancing the understanding of the present utility model, which examples are provided for the purpose of illustrating the present utility model only and are not to be construed as limiting the scope of the present utility model.

As shown in fig. 1 to 5, the present embodiment provides an injection mold with long-stroke demolding, which comprises an upper mold base 1, a lower mold base 2, an upper mold plate 3, a lower mold plate 4, a backing plate 5, a ejector plate 6, a front mold 7 and a rear mold 8.

Wherein, front mould 7 is fixed on upper die base 1, and back mould 8 is fixed on lower bolster 4, is equipped with the space formation die cavity between front mould 7, back mould 8, upper bolster 3 and the lower bolster 4, and plastics are followed the mouth of moulding plastics and are got into in the die cavity, shaping product 9. In this embodiment, two front molds 7 are arranged side by side, two rear molds 8 are correspondingly arranged, and the two front molds are used for producing two products 9.

Referring to fig. 1, the front mold 7 is longer, and the upper portion of the molded product 9 is deeper, so if the product is ejected through the ejector pins 14 after the mold is directly opened, the product is easily damaged, and the upper portion of the product 9 is easily torn when the mold is opened due to the larger contact area between the front mold 7 and the upper mold plate 3 and the product 9.

The ejector plate 6 is arranged on the lower die holder 2 in a lifting manner and is pushed to lift by an oil cylinder at the bottom, the ejector plate 6 is provided with an ejector pin 14, the ejector pin 14 follows the ejector plate 6 to lift, after the die is opened, a product 9 is ejected out, and the base plate 5 is arranged below the lower die plate 4 and used for limiting the stroke of the ejector plate 6.

A plurality of limiting rods 10 are fixed around the bottom of the upper die holder 1, limiting heads 11 are arranged at the end parts of the limiting rods 10, through holes 12 are formed in the upper die plate 3, steps 13 are arranged in the through holes 12, the steps 13 are used for clamping the limiting heads 11 to enable the limiting heads 11 not to move upwards continuously, the limiting rods 10 are inserted into the upper die plate 3 from the bottom of the upper die plate 3, and one ends, far away from the limiting heads 11, of the limiting rods 10 are fixed at the bottom of the upper die holder 1.

When the upper die holder 1 moves upwards, the limiting rod 10 is pulled to move upwards, and when the limiting head 11 is in contact with the step 13, the upper die holder 1 drives the upper die plate 3 to move away from the die.

Further, a fixed block 15 is fixed at the bottom of the upper die holder 1, a sinking groove 16 is arranged on the upper surface of the fixed block 15, and the front die 7 passes through the fixed block 15 and is embedded and fixed in the sinking groove 16. The front die 7 is detachably fixed on the upper die holder 1 and moves along with the upper die holder 1.

When the die of the embodiment is opened, firstly, the upper die holder 1 moves upwards, the upper die holder 1 drives the front die 7 and the limiting rod 10 to move upwards, so that the product 9 is separated from the front die 7, after the upper die holder 1 moves upwards for a certain distance, the inner wall of the product 9 is separated from the front die 7, and meanwhile, the limiting head 11 moves upwards to the step 13 and is abutted against the bottom of the step 13. At this time, the stopper rod 10 can pull the upper die plate 3 to move upward, and even if the upper die plate 3 is separated from the outer wall of the product 9, the die opening operation is completed.

After the die opening is completed, the oil cylinder at the bottom of the ejector plate 6 is started again to push the ejector pins 14 to eject the product 9, and the die stripping of the product 9 is completed.

It should be noted that, in the drawings or the text of the specification, implementations not shown or described are all forms known to those of ordinary skill in the art, and not described in detail. Furthermore, the above definitions of the elements and methods are not limited to the specific structures, shapes or modes mentioned in the embodiments.

It should also be noted that examples of parameters that include particular values may be provided herein, but that these parameters need not be exactly equal to the corresponding values, but may approximate the corresponding values within acceptable error margins or design constraints. The directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., are merely directions with reference to the drawings, and are not intended to limit the scope of the present application.

While the foregoing description illustrates and describes the preferred embodiments of the present utility model, as noted above, it is to be understood that the utility model is not limited to the forms disclosed herein but is not to be construed as excluding other embodiments, and that various other combinations, modifications and environments are possible and may be made within the scope of the inventive concepts described herein, either by way of the foregoing teachings or by those of skill or knowledge of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.

Claims (4)

1. The long-stroke demolding injection mold is characterized by comprising an upper mold base (1), a lower mold base (2), an upper mold plate (3), a lower mold plate (4), an ejector plate (6), a front mold (7) and a rear mold (8);

The front die (7) is fixed on the upper die holder (1), the rear die (8) is fixed on the lower die plate (4), and a gap forming cavity is formed among the front die (7), the rear die (8), the upper die plate (3) and the lower die plate (4) and is used for forming a product (9);

The ejector plate (6) is arranged on the lower die holder (2), and the ejector plate (6) is provided with an ejector pin (14) for ejecting out a product (9);

A plurality of limiting rods (10) are fixed on the periphery of the bottom of the upper die holder (1), limiting heads (11) are arranged at the ends of the limiting rods (10), through holes (12) are formed in the upper die plates (3), steps (13) are arranged in the through holes (12), the limiting rods (10) are inserted into the upper die plates (3) from the bottoms of the upper die plates (3), one ends, away from the limiting heads (11), of the limiting rods (10) are fixed on the bottoms of the upper die holder (1), when the upper die holder (1) moves upwards, the limiting rods (10) are pulled upwards, and when the limiting heads (11) are in interference with the steps (13), the upper die holder (1) drives the upper die plates (3) to move away from the die.

2. The long-stroke demolding injection mold according to claim 1, wherein a fixed block (15) is fixed at the bottom of the upper mold base (1), a sinking groove (16) is formed in the upper surface of the fixed block (15), and the front mold (7) is embedded and fixed in the sinking groove (16).

3. The long-stroke demolding injection mold according to claim 1, characterized in that a shim plate (5) is provided below the lower mold plate (4).

4. The long-stroke demolded injection mold according to claim 2, wherein the front mold (7) is provided with two and the rear mold (8) is provided with two for two products (9) to be finished.