Double-step precision injection molding device

Abstract

The invention relates to the field of injection molding machines, in particular to a double-step precision injection molding device. The invention discloses the double-step precision injection molding device with the following structure, the device comprises a pre-injection storing mechanism, an injection mechanism, a hydraulic system and a spray nozzle, wherein the pre-injection storing mechanism comprises a front premolding material barrel, a premolding material barrel, a screw rod, a feeding seat and a hydraulic motor, and the hydraulic motor is used for driving the screw rod to rotate; the injection mechanism comprises a front material barrel, a material barrel, an injection seat, a plunger rod and an injection electro-hydraulic system; a double-acting cylinder is arranged between a thrust bearing and a sealed groove, and movements of the pre-injection storing mechanism, the injection mechanism and the spray nozzle are coordinated and controlled by the hydraulic system. The double-step precision injection molding device has the advantages that the flow channel is short, the stagnation of materials is avoided, and the injection precision is high.

Description

technical field [0001] The invention relates to the field of injection molding machines, in particular to a two-stage precision injection molding device. Background technique [0002] The two-stage injection molding machine includes a pre-injection pre-molding part and an injection part. That is, the pre-injection pre-molding part first pre-plasticizes and stores the material, and then the injection part performs injection operations. The pre-pre-molding part and the injection part pass through a three-way valve Perform switching control. The two-stage injection molding machine of the prior art generally includes a pre-shot material storage mechanism, an injection mechanism, a nozzle and a three-way valve. The pre-shot material storage mechanism includes a pre-plastic barrel, a screw, a pre-plastic barrel and a stocker Electro-hydraulic device, the screw rod is set in the pre-plastic barrel and connected with the electro-hydraulic device for storing materials; the injec...

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Problems solved by technology

[0003] Due to the two-stage injection machine in the prior art, its structure is usually that the pre-injection storage system of the injection machine is arranged in parallel with the injection system up and down, and the connection between the storage channel and the injection channel is realized through a three-way rotary valve. ; It is mainly suitable for large injection volume and low pressure injection. At the same time, due to the long flow channel at the middle joint arranged in parallel, there is a lot of stagnant material, so that part of the molten plastic is subjected to high shear repeatedly and the residence time is long, resulting in partial overburning and degradation. , affecting product quality, poor injection precision

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