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

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.

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...

AI Technical Summary

Problems solved by technology

The widely used electro-hydraulic servo cartridge valves are mainly two-stage or three-stage nozzle flapper valves and jet tube valves with pilot valves. Although the traditional hydraulic servo system has excellent performance, it has complex structure, difficult manufacture and high maintenance cost. , large hydraulic impact during unloading, high oil purity requirements and high price, for example, the price of a MOOG electro-hydraulic servo cartridge valve is more than 200,000 yuan

In addition, the seal of the electro-hydraulic servo cartridge valve is sealed with a valve gasket or polyoxymethylene. The impurities in the oil during the working process will be squeezed onto the soft seal under high hydraulic impact, causing leakage and stringing. , making the electro-hydraulic servo valve particularly sensitive to oil contamination

Therefore, it is necessary to strengthen and improve the filtration technology to improve the cleanliness of the hydraulic oil, which also increases the cost of the electro-hydraulic servo system. These shortcomings are all caused by the technical characteristics of the traditional servo valve.

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