Quick hydraulic control device of hydraulic injection molding machine

Abstract

The invention discloses a quick hydraulic control device of a hydraulic injection molding machine. A control signal of a servo driver is connected with a driver; the driver is connected with a servo motor; the servo motor drives an oil pump to run; an inlet of the oil pump is connected with a filter; an oil tank is arranged below the filter; an oil pump pressure sensor is mounted at an outlet of the oil pump; a valve opening A of a unidirectional cartridge valve is connected with the outlet of the oil pump; a valve opening B of the unidirectional cartridge valve is connected with a valve opening A of a pressure valve insertion piece; a valve opening B of the pressure valve insertion piece is connected with the oil tank; a valve opening P of a direction cartridge valve is connected with the valve opening A of the pressure valve insertion piece; a valve opening T of the direction cartridge valve is connected with the oil tank; the valve openings A and B of the direction cartridge valve are connected with two cavity valve openings of an oil cylinder; and an oil cylinder pressure sensor is connected with the valve opening P of the direction cartridge valve. The quick hydraulic control device of the hydraulic injection molding machine guarantees long service lives and stable work of the motor and the oil pump and ensures that a hydraulic system works normally; a high-flow working condition is met; furthermore, the quick hydraulic control device is high in response speed and high in control precision and ensures that the injection molding speed is high and different working stages are switched; and the production efficiency and the precision of a product are improved.

Description

technical field [0001] The invention relates to a hydraulic control device, in particular to a fast hydraulic control device for a hydraulic injection molding machine in the technical field of injection molding machines. Background technique [0002] The process of injection molding machine is generally divided into several stages such as mold closing, mold locking, injection, pressure holding, plasticizing and mold opening. The pressure and flow required for each stage are different. When the injection molding machine transitions from one stage to another, the control response speed of various control devices such as directional valves will greatly affect the efficiency and accuracy of injection molding. For example, when switching from the injection stage of high pressure and large flow to the pressure holding stage of high pressure and low flow, the pressure of the oil passage is high and the hydraulic system needs to change direction under the condition of large flow. O...

AI Technical Summary

Problems solved by technology

However, due to the large hydraulic resistance and small adaptable flow rate of ordinary relief valves, it not only causes serious problems such as rising oil temperature and decreasing hydraulic oil viscosity, but also slows down pressure relief, which reduces injection molding efficiency and injection molding accuracy.

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