Two-stage sliding valve type electro-hydraulic servo valve directly driven by limited angle torque motor

Abstract

The invention discloses a two-stage sliding valve type electro-hydraulic servo valve directly driven by a limited angle torque motor. The two-stage sliding valve type electro-hydraulic servo valve has multiple advantages of high output power, wide frequency band, high reaction and the like. The invention provides an overall structure of a two-stage sliding valve type electro-hydraulic servo valve device directly driven by the limited angle torque motor. The system mainly comprises five parts, namely the limited angle torque motor, the two-stage sliding valve type electro-hydraulic servo valve, a controller, a position sensor and a transmission shaft, wherein the transmission device adopts an eccentric mechanism, so that rotating motion of the limited angle torque motor can be converted into linear motion of the transmission shaft, and a precursor-type valve core of the two-stage sliding valve type electro-hydraulic servo valve is controlled; the control part adopts closed-loop control; the position sensor is used for feeding back information to the controller in real time, and the motion of the valve core can be corrected in real time. By the limited angle torque motor for driving, the valve is lower in hysteresis and higher in resolution; the working frequency range of the two-stage sliding valve type electro-hydraulic servo valve can be expanded, and the response speed is increased.

Description

technical field [0001] The invention relates to a two-stage slide valve type electro-hydraulic servo valve directly driven by a torque motor with limited rotation angle. Background technique [0002] The electrohydraulic servo valve is a complex component integrating electromechanical hydraulic and control technology. In the electro-hydraulic servo valve system, the electro-hydraulic servo valve is an interface component that connects the electrical part of the system with the hydraulic part. It can convert the input small electrical signal into a high-power hydraulic signal (flow and pressure) output. The electro-hydraulic servo valve combines the advantages of fast transmission of electrical signals, convenient line connection, remote control, easy detection, feedback, comparison, and correction, as well as the advantages of large output power, small inertia, and quick response of hydraulic power. A key control element of the electro-hydraulic servo control system, the pe...

AI Technical Summary

Problems solved by technology

In the current hydraulic system, although the traditional two-stage spool valve electro-hydraulic servo valve has the advantages of high reliability and large power amplification factor, due to the large friction force of the spool valve core, large hysteresis and slow dynamic response, Therefore, such an indicator is difficult to meet the requirements of a fast electro-hydraulic servo system. Therefore, it is necessary to use a high-response two-stage electro-hydraulic servo valve.

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