High-flow plug-in mounting type three-position four-way electro-hydraulic servo valve and control method thereof

Abstract

Disclosed is a high-flow plug-in mounting type three-position four-way electro-hydraulic servo valve. The high-flow plug-in mounting type three-position four-way electro-hydraulic servo valve comprises a control unit and four plug-in mounting type two-way servo valves. Four signal output ports of the control unit are connected with control signal input ports of the plug-in mounting type two-way servo valves respectively, and four signal input ports of the control unit are connected with valve plug displacement signal output ports of the plug-in mounting type two-way servo valves respectively. Every two plug-in mounting type two-way servo valves are connected in series, an oil outlet of one of every two connected plug-in mounting type two-way servo valves is connected with an oil inlet of the other plug-in mounting type two-way servo valve, so that two series-connected dual-valves are formed. Oil outlets of the series-connected dual-valves are used for being connected with an oil tank, oil inlets of the series-connected dual-valves are used for being connected with a hydraulic oil source, equivalently, the series-connected dual-valves are connected in parallel, so that a bridge type loop is formed, and the high-flow plug-in mounting type electro-hydraulic servo valve with a three-position four-way function is formed. The plug-in mounting type two-way servo valves are controlled by the control unit to change the opening degrees of valve ports so that changes of the flow direction and the flow quantity of oil can be achieved. The contradiction between the high flow and the high frequency response of an existing electro-hydraulic servo valve is effectively overcome, and the high-flow plug-in mounting type three-position four-way electro-hydraulic servo valve has the technical characteristics of the high flow and the high frequency response.

Description

technical field [0001] The invention belongs to the field of fluid transmission and control, and more specifically relates to a large-flow plug-in three-position four-way electro-hydraulic servo valve and a control method thereof. Background technique [0002] The electro-hydraulic servo system is widely used in the field of industrial control because of its advantages of large output power, high control precision and compact structure. With the continuous development of the industrial application field of electro-hydraulic servo system, the requirements for electro-hydraulic servo system are getting higher and higher. The electro-hydraulic servo valve, as the connection hub between the electrical unit and the hydraulic unit in the electro-hydraulic servo system, is a key control element in the system, and its requirements are getting higher and higher accordingly. In the large-scale hydraulic damper high-frequency electro-hydraulic loading test bench, the servo system is r...

AI Technical Summary

Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a large-flow plug-in three-position four-way electro-hydraulic servo valve and its control method, the purpose of which is to solve the problem of the existing electro-hydraulic servo valve with the increase of flow rate. , a technical problem with reduced frequency response

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