Neckling die structure of plastic blow molding machine in improved structure

Abstract

The invention relates to a neckling die structure of a plastic blow molding machine in an improved structure, belonging to the technical field of blow molding machinery. The neckling die structure of the plastic blow molding machine comprises a die core, a die mouth ring and a die sleeve, wherein the die mouth ring is fixed with the bottom of the die sleeve which is fixed with an oil cylinder body; and the die core is arranged in a die mouth cavity and fixedly connected with an oil cylinder column of the oil cylinder. The neckling die structure of the plastic blow molding machine in the improved structure is characterized by also comprising an elastic ferrule and an elastic ferrule thixotropic device for driving the elastic ferrule to deform; the elastic ferrule is arranged in the die mouth ring and contacts with the inner wall of the die mouth ring; the lower part of the elastic ferrule extends out of the die mouth ring; the die core is arranged in the elastic ferrule; a gap for a plastic blank to pass is formed between the outer wall of the die core and the inner wall of the elastic ferrule; and the elastic ferrule thixotropic device is fixed on the die mouth ring and matched with the lower part of the elastic ferrule. The invention is favorable to avoiding the unnecessary waste of the material and also favorable to decreasing the manufacture cost of a plastic container.

Description

technical field [0001] The invention belongs to the technical field of blow molding machines, and in particular relates to a structure-improved die structure of a plastic blow molding machine. Background technique [0002] The die structure of the plastic blow molding machine in the prior art is as image 3 As shown, it includes a core 1, a die ring 2 and a die sleeve 3, the die ring 2 is fixed with the bottom of the die sleeve 3 by screws, the die sleeve 3 is fixed with the cylinder body, and the die core 1 and the die ring 2, and fixedly connected with the oil cylinder column of the oil cylinder. The operation of the oil cylinder causes the cylinder column to carry the mold core 1 to displace. Since the shape of the mold core 1 is a known truncated cone shape, when the oil cylinder column carries the mold core 1 to move, the gap between the mold core 1 and the die ring 2 (in the industry called the forehearth) changes. The larger the gap, the thicker the material, and vi...

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Problems solved by technology

[0003] The axial wall thickness of the plastic hollow container obtained by the die structure of the above-mentioned plastic blow molding machine can only be shown as one thick and both thick, and one thin and both thin, but cannot reflect the difference

However, in the actual manufacture of plastic hollow containers such as plastic water tanks and plastic gallon barrels, there are often situations where the thickness requirements on the same cross section are different. Taking a container with a square or rectangular cross section as an example, four Corners usually need to be thicker than other areas, so if using image 3 As shown in the die structure, in order to ensure the strength of the four corners, the thickness of other areas of the container is usually satisfied to the thickness of the corners (the industry calls it thick or thin), resulting in unnecessary waste of materials , not only does not adapt to the energy-saving and energy-saving spirit advocated by the whole society, but also ineffectively increases the cost of the container

[0004] The applicant has searched the literature, and the Chinese utility model patent authorization announcement number CN2837051Y recommends a ring die device for blow molding machines. The technical problems mentioned above have no meaning for reference

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