Double-valve-core programmable-control hydraulic valve adopting digital fluid pilot drive and control method thereof

Abstract

The invention discloses a double-valve-core programmable-control hydraulic valve adopting digital fluid pilot drive and a control method thereof. The hydraulic valve comprises a main valve body, eighthigh-speed switch valves, four one-way throttle valves and two three-position two-way proportional valves, wherein the two three-position three-way proportional valves are positioned in the main valve body; the right high-speed switch valves are mounted on the main valve body; and a main oil path PTAB port, a pilot oil path P port and a pilot oil path T port are arranged on the main valve body. The double-valve-core programmable-control hydraulic valve adopts valve cores of a pilot-level control proportional valve consisting of the high-speed switch valves, and has the advantages that: whilethe positions of the valve cores of the proportional valves are regulated, oil pressure disturbance at the two ends of each proportional valve can be greatly reduced, and stability while the proportional valves work is improved; and while the positions of the valve cores of the proportional valves are kept, oil pressure disturbance at the two ends of each proportional valve can be completely eliminated, and all high-speed switch valves on the oil path are in a normally open state, so that work loss of the high-speed switch valves is reduced, and the working service life of the oil path is prolonged.

Description

technical field

[0001] The invention belongs to the field of electro-hydraulic control systems, and in particular relates to a digital fluid pilot-driven double-spool programmable control hydraulic valve and a control method thereof. Background technique

[0002] The electro-hydraulic proportional valve controls the displacement of the spool of the working valve through the signals at both ends, so that the size of the valve port changes, and thus completes the pressure and flow output components proportional to the input signal. Electro-hydraulic proportional valve has many advantages such as various forms, high control precision, strong anti-pollution ability, easy docking with computer, etc., and its application field is expanding day by day. Therefore, the structure and control scheme of the electro-hydraulic proportional valve are the key factors to judge whether a hydraulic system is advanced.

[0003] The traditional electro-hydraulic proportional valve is controlled...

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