A soft gel injection mold main runner negative pressure balance structure

Abstract

The utility model discloses a soft glue injection mold main runner negative pressure balance structure, including front mould and be set up in the front mould and squirt, be equipped with main runner in the front mould and squirt, it is characterized by: a plurality of air passages are equipped on the squirt, one end of air passage is open to the outside and the other end of air passage is open to main runner. Thus after opening mould, product stripping time, when pulling product, the residual glue in main runner can distort deformation, thus the air of outside can enter residual glue and main runner wall between from air passage, thereby avoiding residual glue and main runner inner wall form vacuum state adsorption too close and lead to product not easy stripping, not only reduced the labor intensity of worker and improved work efficiency.

Description

Technical Field

[0001] This utility model relates to an injection mold, and more particularly to a negative pressure balance structure for the main runner of a soft rubber injection mold. Background Technology

[0002] Injection molds generally consist of a front mold and a rear mold. When the front and rear molds are closed, they form the molding cavity. The front mold has a nozzle that injects the molten plastic into the molding cavity to form the product. The channels for introducing the molten plastic through the nozzle and in the front mold typically include a main runner and branch runners. After injection molding, residual molten plastic forms in the main runner and branch runners, sealing and blocking them. When injection molding some soft plastic products, some products and residual plastic are ejected together, and the residual plastic adheres tightly to the inner walls of the main runner and branch runners. After mold opening, the product and residual plastic are ejected together. Because the main runner is generally parallel to the mold opening and product demolding direction, during mold opening, product demolding requires pulling the residual plastic out from the main runner's outlet. Especially with some plastic materials, the surface of the residual plastic is very smooth, and it adheres even more tightly to the inner wall of the main runner, making it difficult to separate the residual plastic from the main runner. Therefore, it is necessary to improve the process to address these issues. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, this utility model provides a negative pressure balance structure for the main runner of a soft rubber injection mold.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A negative pressure balancing structure for the main runner of a soft rubber injection mold includes a front mold and a nozzle disposed in the front mold. The front mold and the nozzle are provided with a main runner. The nozzle is characterized in that it is provided with a plurality of air channels, one end of which is connected to the outside and the other end of which is connected to the main runner.

[0006] The nozzle is provided with an air groove, and the front mold is provided with a nozzle mounting hole. The nozzle is installed in the nozzle mounting hole, and the air groove and the hole wall of the nozzle mounting hole form an air passage.

[0007] The nozzle includes a frustum-shaped main body and a cylindrical nozzle body. The main body has a main side groove on its side and a main bottom groove on its bottom surface. The nozzle body has a nozzle side groove on its side and a nozzle bottom groove on its bottom surface. One end of the main side groove is connected to the outside and the other end of the main side groove is connected to the main bottom groove. One end of the nozzle bottom groove is connected to the main channel and the other end of the nozzle bottom groove is connected to the nozzle side groove. The nozzle side groove is connected to the main bottom groove.

[0008] The bottom surface of the mouthpiece is provided with a bottom ring groove, the bottom groove of the mouthpiece is connected to the bottom ring groove, and the bottom ring groove is arranged around the main channel and the inner side of the bottom ring groove is connected to the main channel.

[0009] The depth of the mouth bottom groove and the bottom ring groove is less than the depth of the main side groove, the main bottom groove, and the mouth side groove.

[0010] The groove depth of both the bottom groove and the bottom ring groove is 0.01mm-0.03mm.

[0011] The depth of the main side groove, the main bottom groove, and the mouth side groove is 0.2mm-0.4mm.

[0012] The inner wall of the nozzle has a rough surface.

[0013] The beneficial effects of this utility model are as follows: This utility model has several air channels on the nozzle, one end of which is connected to the outside and the other end of which is connected to the main channel. Therefore, after the mold is opened, when the product is demolded, the residual glue in the main channel can be twisted and deformed when the product is pulled. Thus, the outside air can enter the space between the residual glue and the wall of the main channel from the air channels, thereby avoiding the residual glue from forming a vacuum state with the inner wall of the main channel and adhering too tightly, which would make the product difficult to demold. This not only reduces the labor intensity of workers but also improves work efficiency. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is an overall structural view of the injection mold;

[0016] Figure 2 This is a structural view of the upper mold and the product;

[0017] Figure 3 It is a cross-sectional view of the upper mold and the product;

[0018] Figure 4 This is a structural view of the nozzle. Detailed Implementation

[0019] The advantages and features of this disclosure, as well as its implementation methods, will be illustrated by the following embodiments described with reference to the accompanying drawings. However, this disclosure may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be comprehensive and complete, and will fully convey the scope of this disclosure to those skilled in the art. Furthermore, this disclosure is limited only by the scope of the claims.

[0020] The shapes, dimensions, scales, angles, and numbers disclosed in the accompanying drawings used to describe embodiments of this disclosure are merely examples, and therefore this disclosure is not limited to the details shown. Throughout this specification, the same reference numerals refer to the same elements. In the following description, detailed descriptions of relevant known functions or configurations will be omitted where it is determined that such detailed descriptions would unnecessarily obscure the focus of this disclosure. Where the terms “comprising,” “having,” and “including” are used in this specification, additional components may be added unless “only” is used. Unless otherwise indicated, singular terms may include plural forms.

[0021] When interpreting components, even if not explicitly described, the components are understood to include a range of tolerances.

[0022] When describing positional relationships, such as "on," "above," "below," and "adjacent to," one or more parts may be arranged between two other parts unless "immediately following" or "directly" is used.

[0023] When describing temporal relationships, such as when time sequence is described as “after,” “following,” “next,” and “before,” discontinuous cases may be included unless “exactly” or “directly” is used.

[0024] It should be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from other elements. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element, without departing from the scope of this disclosure.

[0025] As will be fully understood by those skilled in the art, the features of the different embodiments of this disclosure may be coupled or combined with each other in part or in whole, and may cooperate with each other and be technically driven in various ways. The embodiments of this disclosure may be implemented independently of each other, or may be implemented together in an interdependent relationship.

[0026] Reference Figures 1 to 4This utility model discloses a negative pressure balance structure for the main runner of a soft rubber injection mold, including a front mold 1 and a nozzle 2 disposed in the front mold 1. The front mold 1 and nozzle 2 are provided with a main runner 3. The nozzle 2 is provided with several air channels, one end of which is connected to the outside and the other end of which is connected to the main runner 3. The main runner is parallel to the mold opening direction, while the branch runner 6 is perpendicular to the mold opening direction. The branch runner 6 is jointly formed by the front mold 1 and the rear mold 7, thus dividing the branch runner 6 into two parts upon mold opening, preventing vacuum adhesion. Therefore, when the product 8 is demolded, outside air can enter between the residual rubber and the wall of the main runner 3 through the air channels, thereby preventing the residual rubber from forming a vacuum state and adhering too tightly to the inner wall of the main runner 3, which would make the product 8 difficult to demold. Preferably, four air channels are evenly distributed around the nozzle 2 in this application.

[0027] As shown in the figure, the nozzle 2 is provided with an air groove 4, and the front mold 1 is provided with a nozzle 2 mounting hole. The nozzle 2 is installed in the nozzle 2 mounting hole. The air groove 4 and the hole wall of the nozzle 2 mounting hole form an air passage. The above structure is easy to process because it is easier to process grooves on the surface than to process holes on the nozzle 2. The air groove 4 is preferably a square groove, which can be directly processed by milling. The specific structure is as follows: The nozzle 2 includes a frustum-shaped main body 21 and a cylindrical nozzle body 22. The main body 21 has a main side groove 41 on its side and a main bottom groove 42 on its bottom surface. The nozzle body 22 has a side groove 43 on its side and a bottom groove 44 on its bottom surface. One end of the main side groove 41 communicates with the outside, and the other end of the main side groove 41 is connected to the main bottom groove 42. One end of the bottom groove 44 communicates with the main channel 3, and the other end of the bottom groove 44 is connected to the side groove 43. The side groove 43 is connected to the main bottom groove 42. The air groove 4 is segmented according to the shape of the nozzle 2, thus facilitating processing.

[0028] As a preferred structure, the bottom surface of the mouthpiece 22 is provided with a bottom ring groove 45, one end of the bottom groove 44 of the mouthpiece is connected to the bottom ring groove 45, and the bottom ring groove 45 is arranged around the main channel 3 and the inner side of the bottom ring groove 45 is connected to the main channel 3, so that uniform airflow can be formed on the annular surface of the main channel 3.

[0029] As a preferred structure, the depth of the bottom groove 44 is less than the depth of the main side groove 41, the main bottom groove 42, and the mouth side groove 43. Because the bottom groove 44 is directly connected to the main channel 3, it is necessary to prevent the adhesive from flowing out of the bottom groove 44. Therefore, the depth of the bottom groove 44 is shallower than that of the main side groove 41, the main bottom groove 42, and the mouth side groove 43, while the main side groove 41, the main bottom groove 42, and the mouth side groove 43 can be deeper to facilitate the inflow of outside air. Specifically, the depth of the bottom groove 44 is 0.01mm-0.03mm, preferably 0.02mm, so that air can enter while the adhesive cannot flow in through such a thin gap. Of course, the depth of the main side groove 41, the main bottom groove 42, and the mouth side groove 43 is 0.2mm-0.4mm, preferably 0.3mm, to facilitate the entry of air.

[0030] As a preferred structure, the inner hole 5 of the nozzle 2 has a rough surface. The inner hole 5 of the nozzle 2 is part of the main channel 3. The other part of the main channel 3 is located in the front mold 1. The rough surface can reduce the situation of vacuum adsorption between the nozzle and the residual glue, thus making it easier to remove. Although the friction is increased, it is still much smaller than the adsorption force formed by vacuum.

[0031] The above provides a detailed description of a negative pressure balance structure for the main runner of a soft rubber injection mold provided by the embodiments of this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A negative pressure balancing structure for the main runner of a soft rubber injection mold, comprising a front mold and a nozzle disposed in the front mold, wherein the front mold and the nozzle are provided with a main runner, characterized in that: The nozzle is provided with several air channels, one end of which is connected to the outside and the other end of which is connected to the main channel.

2. The negative pressure balance structure of the main runner of a soft rubber injection mold according to claim 1, characterized in that: The nozzle is provided with an air groove, and the front mold is provided with a nozzle mounting hole. The nozzle is installed in the nozzle mounting hole, and the air groove and the hole wall of the nozzle mounting hole form an air passage.

3. The negative pressure balance structure of the main runner of a soft rubber injection mold according to claim 2, characterized in that: The nozzle includes a frustum-shaped main body and a cylindrical nozzle body. The main body has a main side groove on its side and a main bottom groove on its bottom surface. The nozzle body has a nozzle side groove on its side and a nozzle bottom groove on its bottom surface. One end of the main side groove is connected to the outside and the other end of the main side groove is connected to the main bottom groove. One end of the nozzle bottom groove is connected to the main channel and the other end of the nozzle bottom groove is connected to the nozzle side groove. The nozzle side groove is connected to the main bottom groove.

4. The negative pressure balance structure of the main runner of a soft rubber injection mold according to claim 3, characterized in that: The bottom surface of the mouthpiece is provided with a bottom ring groove, the bottom groove of the mouthpiece is connected to the bottom ring groove, and the bottom ring groove is arranged around the main channel and the inner side of the bottom ring groove is connected to the main channel.

5. The negative pressure balance structure of the main runner of a soft rubber injection mold according to claim 4, characterized in that: The depth of the bottom groove and the bottom ring groove is less than the depth of the main side groove, the main bottom groove, and the mouth side groove.

6. The negative pressure balance structure of the main runner of a soft rubber injection mold according to claim 4, characterized in that: The groove depth of both the bottom groove and the bottom ring groove is 0.01mm-0.03mm.

7. The negative pressure balance structure of the main runner of a soft rubber injection mold according to claim 4, characterized in that: The depth of the main side groove, the main bottom groove, and the mouth side groove is 0.2mm-0.4mm.

8. The negative pressure balance structure of the main runner of a soft rubber injection mold according to claim 1, characterized in that: The inner wall of the nozzle has a rough surface.

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