CN201633174U

CN201633174U - Improved structure of hollow plastic injection mould

Info

Publication number: CN201633174U
Application number: CN2010201206155U
Authority: CN
Inventors: 张良溪
Original assignee: Acot Tooling (Xiamen) Co Ltd
Current assignee: Acot Tooling (Xiamen) Co Ltd
Priority date: 2010-02-22
Filing date: 2010-02-22
Publication date: 2010-11-17
Anticipated expiration: 2020-02-22

Abstract

The utility model discloses an improved structure of a hollow plastic injection mould, which comprises a cavity, a main flow channel, an air inlet and an overflow groove. Both the main flow channel and the air inlet are communicated with the cavity; and the overflow groove is communicated with the cavity through an overflow port and arranged in the position of the cavity far away from the main flow channel. Because the overflow groove is formed on the cavity of the mould in the utility model, when nitrogen is blown into the cavity of the mould, redundant molten plastics can flow into the overflow groove through the overflow port; and a gas-assisted hollow plastic injection part solves the discharge problem of the redundant molten materials during the hollow forming process, so that the residual stress of products is reduced, thereby ensuring hard deformation of the products and eliminating sink marks on the surfaces of the products.

Description

The improvement structure of hollow injection mold

Technical field

The utility model relates to a kind of injection mold, particularly relates to a kind of improvement structure of hollow injection mold.

Background technology

In industrial circle, daily life, use various plastic parts and plastic products widely.As the plastic part that uses in the industrial circle, its intensity, precision etc. all there are higher requirement, mostly adopt solid member, there is the defective of high material consumption in this solid member.For this reason, people design the plastic part of inner hollow, but exist unnecessary molten plastic to discharge problem in hollow plastic part injection moulding process.

The utility model content

The purpose of this utility model is to provide a kind of improvement structure of injection mold, the discharge problem of the auxilliary hollow moulding unnecessary molten plastic in the hollow forming process of its gas.

For achieving the above object, technical solution of the present utility model is:

The utility model is a kind of improvement structure of hollow injection mold; It comprises die cavity, sprue, air inlet; Described sprue and air inlet all are communicated with die cavity; It also comprises overflow launder; Described overflow launder is communicated with die cavity by overfall and is arranged on die cavity locating away from the main flow road junction.

Described overflow launder has two, is symmetricly set on both sides, the locating away from the main flow road junction of air inlet respectively.

After adopting such scheme, because the utility model is offered overflow launder on mold cavity, when nitrogen is blown into mold cavity, unnecessary molten plastic can flow into overflow launder by overfall, the discharge problem of the auxilliary hollow moulding unnecessary molten plastic in the hollow forming process of its gas, reduce the product residual stress, made product not yielding, eliminated the product surface shrink mark.

Below in conjunction with the drawings and specific embodiments the utility model is further described.

Description of drawings

Fig. 1 is an axonometric drawing of the present utility model;

Fig. 2 is a vertical view of the present utility model;

Fig. 3 is the cutaway view of Fig. 2 along the B-B line.

The specific embodiment

As shown in Figure 1 and Figure 2, the utility model is a kind of improvement structure of hollow injection mold; It comprises die cavity 1, sprue 2, air inlet 3 and overflow launder 4.

Described sprue 2 and air inlet 3 all are communicated with die cavity 1.Described overflow launder 4 has two 41,42, is symmetricly set on the both sides of air inlet 3 respectively, away from 2 mouthfuls of places of sprue.

Operation principle of the present utility model:

When nitrogen from by air tube 5 when air inlet 3 is blown into nitrogen, the molten plastic in the die cavity 1 can be pushed to die cavity 1 two ends, unnecessary molten plastic can by

overflow launder

41,42 overfall 411,421 flow in the overflow launders 41,42 (as shown in Figure 3).

Emphasis of the present utility model just is: set up an overflow launder that is connected with mold cavity.

The above, it only is the utility model preferred embodiment, the layout of overflow launder can have multiple, so can not limit the scope that the utility model is implemented with this, the i.e. equivalence of doing according to the utility model claim and description changes and modifies, and all should still belong in the scope that the utility model patent contains.

Claims

1. the improvement structure of a hollow injection mold; It comprises die cavity, sprue, air inlet; Described sprue and air inlet all are communicated with die cavity; It is characterized in that: it also comprises overflow launder; Described overflow launder is communicated with die cavity by overfall and is arranged on die cavity locating away from the main flow road junction.

2. the improvement structure of hollow injection mold according to claim 1 is characterized in that: described overflow launder has two, is symmetricly set on both sides, the locating away from the main flow road junction of air inlet respectively.