Blow Needle Mechanism for Single Blow Hole in Blow Mold

Abstract

A blowing needle mechanism for a single blowing hole of a blow mold, which includes a blowing needle (1) connected to an air source, a push-pull cylinder (2) fixed on a mold base, and a blowing needle guide mechanism, and the needle body includes an outer tube (5 ) and an inner tube (6), the inner tube (6) is located in the outer tube (5), and the inner wall of the outer tube (5) and the outer wall of the inner tube (6) form a channel (7); the upper end of the inner tube (6) It is connected and communicated with the needle (3); the upper end of the outer tube (5) is sealed and connected with the needle (3), and the outer peripheral surface of the upper end of the outer tube (5) is provided with at least one ventilation hole (8), and the outer tube ( The lower end of 5) is connected with the needle base (4); the first pipe joint (9) communicates with the inner pipe (5), and the second pipe joint (10) communicates with the channel (7); the needle head (3) is provided with several Blowing holes (11); compared with the prior art, the present invention has the characteristics of relatively small volume, shortened production cycle, low preparation cost and easy maintenance.

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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