Special three-way electro hydraulic servo valve for down-pressing system of rolling mill

Abstract

The invention relates to a special three-way electro hydraulic servo valve for a down-pressing system of a rolling mill, which mainly consists of a main valve, a jet flow pipe pilot level and a detection feedback device, wherein the main valve uses a four-step three-way slide valve with a valve sleeve and is driven by the jet flow pipe type pilot level, the end part of a valve core is provided with a displacement sensor, the position of the valve core realizes the closed ring control through the signal feedback of a control circuit and the displacement sensor, the jet flow pipe pilot level mainly comprises a moment motor, a jet flow pipe and a receiver, the moment motor is arranged in an upper cover of the main valve, a dry type permanent-magnet structure is adopted, the jet flow pipe is arranged in a middle valve block, and two cavities of the receiver are communicated to both ends of a main valve core through an oil passage of the main valve body. The invention has the advantages of simple structure, low processing cost, strong practicability, excellent performance and the like, and can be used in down-pressing or up-pressing high-pressure servo systems with high resolution and high dynamic response required in the milling process.

Description

technical field [0001] The invention relates to the field of valves, in particular to a special three-way electro-hydraulic servo valve for a rolling mill pressing system. Background technique [0002] In the hydraulic press down / upper high pressure servo system of a rolling mill, the standard four-way electro-hydraulic servo valve is often blocked with a working oil port, and only one control chamber of the servo valve is used to control the press down / up cylinder, that is, the four-way servo valve is used as a three-way valve. For use with servo valves. The main slide valve of the standard four-way electro-hydraulic servo valve is symmetrically matched, and the valve core needs to be precisely ground in the axial and radial directions; while only one of the two control chambers of the servo valve is used in the hydraulic pressing system of the rolling mill, resulting in Great waste. In order to adapt to the load conditions of the hydraulic pressure down / up system, the st...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a special three-way electro-hydraulic servo valve for rolling mill pressing system to overcome the defect that four-way servo valves are generally used as three-way servo valves

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