CN219114694U

CN219114694U - Vacuum pumping structure for mold cavity

Info

Publication number: CN219114694U
Application number: CN202223413890.8U
Authority: CN
Inventors: 齐鸣
Original assignee: Perlman Electrical Kunshan Co ltd
Current assignee: Perlman Electrical Kunshan Co ltd
Priority date: 2022-12-20
Filing date: 2022-12-20
Publication date: 2023-06-02
Anticipated expiration: 2032-12-20

Abstract

The utility model discloses a mold cavity vacuumizing structure, which comprises the following steps: the top of the male template is provided with a female template, and a cavity insert is arranged between the male template and the female template; the male die cushion plate is arranged in the middle of the male die plate, a valve air inlet channel is arranged between the male die cushion plate and the cavity insert, and an air extraction valve is arranged on the valve air inlet channel; one end of the piston is connected with a valve, the valve is matched with the cavity insert, and the other end of the piston is arranged in the extraction valve through a spring; and one end of the air suction channel is communicated with the valve air inlet channel between the air suction valve and the cavity insert, and the other end of the air suction channel is provided with an air suction connector.

Description

Vacuum pumping structure for mold cavity

Technical Field

The utility model relates to a mold cavity vacuumizing structure, and belongs to the technical field of molds.

Background

The production process of the injection molding product is summarized as follows: the plastic particles are decomposed at high temperature by an injection molding machine, melted and injected into a mold cavity to mold the product.

Because some air is retained in the cavity of the die core, when the air is formed, the retained air and the molten raw material injected into the cavity generate chemical reaction to cause bad factors such as increased shearing heat, air trapping is easy to cause, and bad phenomena such as raw material performance reduction and the like influence the product quality. The most common method for solving the problem is to open and exhaust on the parting surface of the die core and design an exhaust inlet structure on the die cavity to exhaust the gas in the die cavity as much as possible. However, some products are limited by the structure or the appearance of the customer, and the venting insert cannot be designed on the mold insert at will. Especially, the product like a barrel-shaped deep cavity is difficult to fundamentally solve by only adding exhaust gas on the parting surface of the die core. Under the background, the problem can be well solved by adopting a mold cavity vacuumizing structure. And the structure is not limited by the product structure and the appearance requirement.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provides a die cavity vacuumizing structure.

A mold cavity evacuation structure comprising:

the top of the male template is provided with a female template, and a cavity insert is arranged between the male template and the female template;

the male die cushion plate is arranged in the middle of the male die plate, a valve air inlet channel is arranged between the male die cushion plate and the cavity insert, and an air extraction valve is arranged on the valve air inlet channel;

one end of the piston is connected with a valve, the valve is matched with the cavity insert, and the other end of the piston is arranged in the extraction valve through a spring;

and one end of the air suction channel is communicated with the valve air inlet channel between the air suction valve and the cavity insert, and the other end of the air suction channel is provided with an air suction connector.

Further, the cavity insert comprises an upper part and a lower part, and an exhaust groove is formed between the two parts and is communicated with the air suction channel.

Further, a parting surface sealing strip is arranged on the outer side of the exhaust groove between the cavity inserts.

Further, a sealing ring is arranged at the joint of the extraction valve and the piston.

Further, a sealing ring is arranged at the joint of the extraction valve and the valve air inlet channel.

Further, an air inlet joint is arranged at the air inlet end of the valve air inlet channel.

Compared with the prior art, the utility model has the beneficial effects that: the vacuumizing mechanism can suck out a larger amount of air more rapidly than the traditional exhaust structure design, and most of air is sucked out by a valve of the vacuumizing mechanism before injection molding;

the vacuumizing mechanism continues to work in the injection molding process, and even a small amount of gas generated in the injection molding process can be sucked out of the cavity continuously;

even without being faster, better quality products can be obtained at least in the same time using the evacuation mechanism under the same injection molding conditions.

Drawings

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

FIG. 2 is an enlarged view of a portion of the present utility model;

in the figure: 1. an air inlet joint; 2. an air suction joint; 3. parting surface sealing strips; 4. a cavity insert; 5. a product; 6. a thimble; 7. a valve intake passage; 8. an air suction passage; 9. an exhaust groove; 10. an extraction valve; 11. a spring; 12. a first sealing ring; 13. a piston; 14. a valve; 15. a seal ring; 16. a thimble sealing ring; 17. a male die backing plate; 18. a needle ejection plate; 19. a master template; 20. a male template.

Detailed Description

The utility model is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

As shown in fig. 1 and 2, a mold cavity vacuumizing structure is disclosed, which comprises:

a male template 20, wherein a female template 19 is arranged at the top of the male template 20, and a cavity insert 4 is arranged between the male template 20 and the female template 19;

the male die cushion plate 17 is arranged in the middle of the male die plate 20, a valve air inlet channel 7 is arranged between the male die cushion plate 17 and the cavity insert 4, and an exhaust valve 10 is arranged on the valve air inlet channel 7;

one end of the piston 13 is connected with a valve 14, the valve 14 is matched with the cavity insert 4, and the other end of the piston 13 is arranged in the extraction valve through a spring 11;

and one end of the air suction channel 8 is communicated with the valve air inlet channel 7 between the air suction valve 10 and the cavity insert 4, and the other end of the air suction channel 8 is provided with an air suction connector 2 which is convenient to be connected with a vacuumizing mechanism.

The cavity insert 4 comprises an upper part and a lower part, an exhaust groove 9 is formed between the two parts and is communicated with the air suction channel 8, and in the process of starting injection molding of the product 5, a valve 14 of the vacuumizing mechanism is reset, but the vacuumizing mechanism (similar to a dust collector) continuously works to absorb air through the exhaust groove 9, so that the fluidity of plastic is increased to the greatest extent, and the pressure required by injection molding is reduced.

In order to ensure the tightness of the cavity insert 4, the outer side of the exhaust groove 9 is provided with a parting surface sealing strip 3, and the vacuum state in the cavity insert 4 can be ensured by arranging the parting surface sealing strip 3.

The air suction valve 10 is provided with a first sealing ring 12 at the joint of the piston 13, and the first sealing ring 12 is arranged at the joint of the air suction valve 10 and the valve air inlet channel 7, so that air in the air inlet can not enter the air suction channel when the air inlet channel ejects the piston rod.

The air inlet end of the valve air inlet channel 7 is provided with an air inlet joint 1, so that the air pump or air supply equipment can be conveniently connected.

Working principle:

before the product starts to be injected, the valve air inlet channel 7 is used for feeding air, the air inlet drives the piston 13, the piston 13 is connected with the valve 14 so as to ensure that the valve 14 is opened, meanwhile, the bottom of the piston 13 is sealed by the sealing ring 12, and the air inlet channel 8 starts to suck air to discharge air from the cavity insert 4, so that a vacuum-state cavity is generated for injection molding;

during the injection of the product, the valve 14 is returned, but the evacuation mechanism (like a vacuum cleaner) continues to operate to absorb air through the air discharge channel 9, maximizing the flowability of the plastic and reducing the pressure required for injection.

When injection molding is completed, the vacuumizing mechanism stops working, the product is ejected out through the ejector pin 6 after being cooled, the ejector pin 6 is also provided with the ejector pin sealing ring 16 and the second sealing ring 15, and the ejector pin sealing sleeve 16, the second sealing ring 15 and the parting surface sealing strip 3 can also effectively ensure that external air is isolated from entering the cavity during working.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in a specific case.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present utility model, and such modifications and variations should also be regarded as being within the scope of the utility model.

Claims

1. The utility model provides a mould die cavity evacuation structure which characterized in that includes:

the mold comprises a male mold plate (20), wherein a female mold plate (19) is arranged at the top of the male mold plate (20), and a cavity insert (4) is arranged between the male mold plate (20) and the female mold plate (19);

the male die cushion plate (17), the male die cushion plate (17) is arranged at the bottom of the male die plate (20), a valve air inlet channel (7) is arranged between the male die cushion plate (17) and the cavity insert (4), and an air extraction valve (10) is arranged on the valve air inlet channel (7);

the piston (13), one end of the piston (13) is connected with a valve (14), the valve (14) is matched with the cavity insert (4), and the other end of the piston (13) is arranged in the extraction valve through a spring (11);

and one end of the air suction channel (8) is communicated with a valve air inlet channel (7) between the air suction valve (10) and the cavity insert (4), and the other end of the air suction channel is provided with an air suction connector (2).

2. A mould cavity vacuumizing structure according to claim 1, characterized in that the cavity insert (4) comprises an upper part and a lower part, between which an air discharge groove (9) is formed and which communicates with the air suction channel (8).

3. The mold cavity vacuumizing structure according to claim 2, wherein a parting surface sealing strip (3) is arranged outside the air exhaust groove (9).

4. A mould cavity vacuumizing structure according to claim 1, characterized in that a sealing ring (12) is arranged at the joint of the air extraction valve (10) and the piston (13).

5. The mold cavity vacuumizing structure according to claim 1, wherein a sealing ring (12) is arranged at the joint of the air extracting valve (10) and the valve air inlet channel (7).

6. A mould cavity vacuumizing structure according to claim 1, characterized in that the air inlet end of the valve air inlet channel (7) is provided with an air inlet joint (1).