High pressure model-locked loop of double movable plate direct press injection machine

Abstract

The invention relates to a high pressure die-locking circuit of a dual-motion plate direct pressure injection machine, comprising an oil pump which is driven by an electric motor, an electromagnetic reversing valve, an electromagnetic switch valve, overflow valves, a hydraulic control check valve and a high pressure die-locking oil cylinder; the electric motor drives the oil pump; the oil outlet of the oil pump is connected with the electromagnetic reversing valve; one working oil nozzle of the electromagnetic reversing valve is connected with the high pressure chamber of the high pressure die-locking oil cylinder through the hydraulic control check valve; another working oil nozzle of the electromagnetic reversing valve is connected with the recovery chamber of the high pressure die-locking oil cylinder; the oil outlet of the oil pump and the recovery chamber of the high pressure die-locking oil cylinder are both provided with the overflow valves; the non-rod chamber of the high pressure die-locking oil cylinder is connected with an oil tank through the electromagnetic switch valve. The proposal sufficiently considers the working characteristics of the dual-motion direct pressinginjection machine and optimizes and simplifies the high pressure die-locking control oil path, and the invention is the high pressure die-locking circuit of the dual-motion direct pressing injection machine with more reasonable structure.

Description

technical field [0001] The invention relates to a high-pressure mold-clamping circuit of a double-moving-plate direct-pressure injection molding machine. Background technique [0002] The existing double-moving platen direct pressure injection molding machine high-pressure clamping circuit generally has a complex structure and many system components, which easily brings a series of problems, such as many system action steps, resulting in long action cycles; due to the number of system components There are many, which will easily increase the leakage of the system, resulting in unreliable pressure maintenance. In addition, the design of the oil circuit block is cumbersome, the workload of pipe layout is heavy, the quality requirements of maintenance and machine operators are high, and the system maintenance is also troublesome. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a double-moving...

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Problems solved by technology

[0005] In the present invention, an electromagnetic reversing valve is used to switch the high-pressure / resetting action of the high-pressure mold-clamping oil cylinder. Aiming at the disadvantage of large leakage in the general slide valve-type reversing valve, one of the working oil ports of the electromagnetic reversing valve and the high-pressure mold-clamping oil cylinder A hydraulically controlled one-way valve is connected in series between the high-pressure chambers to keep the pressure; at the same time, because the general electromagnetic reversing valve has the problem of large high-pressure reversing impact, an electromagnetic switch valve is connected to the high-pressure cavity of the high-pressure clamping cylinder for pressure relief before reset.

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