Electro-hydraulic pilot control type plug-in type check valve

Abstract

The invention discloses an electro-hydraulic pilot control type plug-in type check valve which comprises a valve body, a valve element, a valve cover, a spring and a pilot valve. The valve cover is connected to the valve body in a covering mode, and the valve element and the spring are arranged in the valve body. The spring is connected between the valve cover and the valve element in a pressing mode, a cover plate is arranged on the valve cover, and a safety oil cylinder is defined by the valve cover and the cover plate together. A piston type ejector rod used for executing opening and closing of the valve element and for detecting whether the valve element is closed or not is arranged in the safety oil cylinder in a sliding mode. One end of the piston type ejector rod is connected with the valve element, and the other end of the piston type ejector rod extends out of the cover plate. The valve element comprises a plug-in check valve arranged in the valve element. The two ends of the plug-in check valve are communicated with a first hole and a valve element cavity respectively, and the allowed flowing direction of the plug-in check valve is the direction from the first hole and the valve element cavity. The safety oil cylinder is divided into two rod cavities, namely a first piston cavity and a second piston cavity, by the piston type ejector rod. The electro-hydraulic pilot control type plug-in type check valve has the advantages of being simple and reasonable in structure, high in safety, fast in closing response, low in noise, and wide in application range.

Description

technical field [0001] The invention relates to a one-way valve, in particular to an electro-hydraulic pilot control type plug-in one-way valve. Background technique [0002] Accumulators are used as energy sources for rapid injection in the injection part of cold chamber die-casting machines. [0003] Some domestic cold chamber die casting machines adopt the structure of switch valve + check valve. [0004] Specifically: the on-off valve for oil supply of the accumulator is composed of a cartridge valve and a pilot control solenoid valve. Since there is a boost after the rapid injection, a check valve must be installed between the injection cylinder and the rapid accumulator. Therefore, the quality of the check valve not only affects the injection performance, in other words, the closing speed of the check valve affects the pressure building time, and whether the check valve is controllable also affects the safety level of the machine. [0005] At present, the one-way val...

AI Technical Summary

Problems solved by technology

This kind of cartridge valve with spool position feedback function is first of all expensive, and secondly, once such safety measures are adopted, it will be too dependent on the treatment after the occurrence of safety factors, and cannot control the occurrence of safety factors from the source. cause the defect to be too obvious

[0008] In short, when the die casting machine has strict requirements on the pressure building time and safety requirements, the traditional method has gradually become difficult to apply

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