Blowing needle mechanism for single blowing hole of blowing mold

Abstract

A blowing needle mechanism for a single blowing hole of a blowing mold comprises a blowing needle (1) connected with an air source, a push-pull air cylinder (2) fixed on a mold rack and a blowing needle guide mechanism, wherein a needle body comprises an outer pipe (5) and an inner pipe (6); the inner pipe (6) is located in the outer pipe (5); the inner wall of the outer pipe (5) and the outer wall of the inner pipe (6) form a channel (7); the upper end of the inner pipe (6) is connected and communicated with a needle head (3); the upper end of the outer pipe (5) is hermetically connected withthe needle head (3); at least one air hole (8) is formed in the outer peripheral surface of the upper end of the outer pipe (5); the lower end of the outer pipe (5) is connected with a needle seat (4); a first pipe connector (9) is communicated with the inner pipe (5); a second pipe connector (10) is communicated with the channel (7); and a plurality of air blowing holes (11) is formed in the needle head (3). Compared with the prior art, the blowing needle mechanism has the characteristics that the volume is relatively small, the production cycle can be shortened, the preparation cost is relatively low and the maintenance is relatively simple and convenient.

Description

technical field [0001] The invention relates to the technical field of blowing needles for blow molds, in particular to a blowing needle mechanism for a single blowing hole of a blow mold. Background technique [0002] Blow molding mainly refers to hollow blow molding (also known as blow molding), which is a method of blowing a hot-melt parison closed in a mold to form a hollow product by means of gas pressure. It is the third most commonly used plastic processing method, and at the same time It is also a fast-growing plastic molding method. The mold used for blow molding only has a female mold (concave mold). Compared with injection molding, the cost of equipment is lower, the adaptability is stronger, the formability is good (such as low stress), and products with complex undulating curves (shape) can be formed. . [0003] At present, the product structure in the blow molding mold has only one port. In the blow molding process, an additional air outlet needs to be instal...

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Problems solved by technology

[0003] At present, the product structure in the blow molding mold has only one port. In the blow molding process, an additional air outlet needs to be installed on the product, which can lead out the gas in the product during molding to prevent product defects caused by high-temperature gas concentration and excessive air pressure. After the blow molding is completed, the air outlet is blocked, but there are the following problems after this operation: first, the air outlet is blocked to prolong the production cycle, and also increases the probability of leakage, resulting in an increase in product cost and a decrease in use stability; The air return part is set on the side of the blowing needle mechanism, and is linked with the blowing needle mechanism, and the cylinder that pushes the blowing needle mechanism is larger, resulting in a larger overall volume, more parts, more troublesome installation and maintenance, and higher maintenance costs. high

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