Electro-hydraulic valve

Abstract

The invention discloses an electro-hydraulic valve which comprises a main valve body and an electromagnetic directional valve located at the top of the main valve body. The main valve element, the front end cover and the rear end cover are located in the main valve body and at the two ends of the main valve body; the second valve element is elastically arranged at the second end of the main valve element; when the electromagnetic directional valve is not electrified, the electro-hydraulic valve is in a working state; control oil passes through the valve body, the electromagnetic reversing valve and the rear end cover and then is combined with the elastic assembly to push the main valve element to the end face of an inner hole of the front end cover and keep the main valve element in the first direction. Control oil in the front end cover reaches the oil tank after passing through the valve body and the electromagnetic reversing valve; hydraulic oil is connected to the outside after passing through the valve body and drives the actuating mechanism to act; when the electromagnetic reversing valve is electrified, the electro-hydraulic valve is in an unloading state; the control oil overcomes the force of the elastic assembly after passing through the valve body electromagnetic directional valve and the front end cover, pushes the main valve core to the end face of the elastic assembly and keeps in a second direction; control oil of the rear end cover reaches the oil tank after passing through the valve body, the electromagnetic directional valve and the valve body; hydraulic oil reaches an oil tank through an oil inlet of the valve body.

Description

technical field [0001] The invention relates to mechanical manufacturing, in particular to an electro-hydraulic valve. Background technique [0002] The electro-hydraulic valve is a two-stage reversing valve composed of a main valve and a solenoid valve pilot valve, and its flow capacity is larger than that of a simple solenoid valve. There is an electro-hydraulic valve that can be unloaded. Usually, it is unloaded when it is not energized, and it is not unloaded when it is energized. The iron is always kept energized, which not only consumes a lot of electric energy, but also easily causes the electromagnet to overheat, which affects the service life of the whole valve. [0003] In addition, the unloading main spool must be hollow, one end must be blocked, and the structure needs to be welded. There are two main welding methods: argon arc welding and brazing. After the long-term collision of the front and rear covers, a very small number of welds will fail due to fatigue,...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the technical problem of low reliability of the existing electro-hydraulic valve, the purpose of the present invention is to provide an electro-hydraulic valve, which provides a corresponding solution to the technical problems of the existing electro-hydraulic valve, It greatly improves the reliability of the electro-hydraulic valve at work, and well overcomes the problems existing in the prior art

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