Balanced high-pressure large-current AC (Alternating Current) servo direct-driven cartridge valve

An AC servo and AC servo motor technology, applied in the field of hydraulic valves, can solve problems such as increasing the cost of electro-hydraulic servo systems, high requirements for oil purity, and sensitivity to oil pollution, achieving good repeatability of positioning accuracy, overcoming difficulties in use, Use simple effects
CN102705286AInactive Publication Date: 2012-10-03XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
XI AN JIAOTONG UNIV
Publication Date
2012-10-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a balanced high-pressure large-current AC (Alternating Current) servo direct-driven cartridge valve, comprising an AC servo motor, wherein the AC servo motor and a harmonic reducer are connected to a valve sleeve, the output shaft of the AC servo motor is connected with the input shaft of the harmonic reducer, the output shaft of the harmonic reducer is connected with a leading screw by a coupler, the leading screw is provided with a sliding block, the sliding block is connected with a linear displacement sensor, the sliding block is connected with a valve rod, the end of the valve rod is provided with an external thread, a valve core is provided with an internal thread, the valve rod drives the opening and closing of the valve core by internal thread connection, a small end cover is connectedly fixed on a valve seat, and is fixedly connected with a valve core sleeve, a valve sleeve is inserted in the valve seat and fixed in the valve seat by a top end cover, the top end cover is fixed with the valve seat, and the valve seat is installed in a hydraulic system by a plug-in manner, so that the influence of the oil-liquid pressure on the valve is reduced, and the instant hydraulic power of the valve is small. According to the invention, as a closed-loop control servo direct-driven manner is adopted, the valve has the advantages of simple structure, rapid response, accurate control and high linearity.
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Description

technical field

[0001] The invention belongs to the technical field of hydraulic valves, in particular to a balanced high-pressure and large-flow AC servo direct-drive cartridge valve. Background technique

[0002] The electro-hydraulic servo valve is a complex electro-hydraulic component. In the electro-hydraulic servo system, as a bridge connecting the electrical part and the hydraulic part, it is the core component of the electro-hydraulic servo control system. In recent years, with the rapid development of large-scale hydraulic equipment such as die-casting machines, the market demand for electro-hydraulic servo cartridge valves is increasing, and higher technical requirements are put forward for them. Especially for the hydraulic control of forging, die-casting and injection molding equipment, there is an urgent need for servo cartridge valves with large flow, fast response, convenient maintenance and the ability to work under high hydraulic shock. The widely used elec...

Claims

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