Combined type flow valve for liquid of high-pressure large-flow alternating current servo direct-drive machine

Abstract

The invention provides a combined type flow valve for liquid of a high-pressure large-flow alternating current servo direct-drive machine. An alternating current servo motor drives a push rod through the transmission of a thread and the push rod acts on a hydraulic transmission cavity which is sealed with hydraulic oil; when the push rod moves, the inner volume of the hydraulic transmission cavity is changed and a valve core moves to the same side to compensate the change of the volume, so that the movement of the valve core is controlled through controlling the movement of the push rod. The valve has the advantages of simple structure, accurate control and convenience for use, can directly use a computer to carry out digital control, has good buffering and positioning performances, can meet the requirements of positioning any point, can realize a closed ring system of electric feedback, and especially can be used for better solving the problem that the previous servo valve is sensitive to oil liquid pollution. The valve is wide in working pressure range and large in flow and can work under a very low oil supply pressure, and the dynamic performance is not greatly influenced by the low oil supply pressure; and the valve has fewer middle transmission links so that the efficiency of the system can be improved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic valves, in particular to a high-pressure and large-flow AC servo direct-drive machine-hydraulic composite flow 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 systems, especially electro-hydraulic servo valves, has increased, and higher technical requirements have been put forward for them. The widely used electro-hydraulic proportional throttle valves are mainly two-stage or three-stage nozzle flapper valves and jet pipe valves with pilot valves. Although the traditional hydraulic servo system has excell...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a high-pressure and large-flow AC servo direct-drive machine-hydraulic composite flow valve, which can realize simplification of structure and high efficiency of use, improve the stability of the system, and Applicability in high pressure, large flow and other environments, especially to overcome the problem of sensitivity to oil pollution

Images