HYDRAULIC CONTROL SYSTEM, CONTROL METHOD FOR HYDRAULIC CONTROL SYSTEM, AND BOOM

WIPO Patent Application WO/2024/007507

A1

A hydraulic control system, a control method for a hydraulic control system, and a boom. The hydraulic control system comprises: a first proportional valve (100); a solenoid directional valve (200), a first oil port (c) of the solenoid directional valve (200) being communicated with the first proportional valve (100), a second oil port (d) of the solenoid directional valve (200) being communicated with an oil return tank (920), a third oil port (e) of the solenoid directional valve (200) being communicated with a rod cavity of an oil cylinder (910) by means of a first pipeline (300), and a fourth oil port (f) of the solenoid directional valve (200) being communicated with a rodless cavity of the oil cylinder (910) by means of a second pipeline (400); a first balancing valve (500), the balancing valve (500) being provided on the first pipeline (300); a second balancing valve (600), the second balancing valve (600) being provided on the second pipeline (400); a second proportional valve (700), the second proportional valve (700) being provided on the second pipeline (400) and between the second balancing valve (600) and the solenoid directional valve (200); and a damping circuit (800).

LIU GUOLIANG (CN)
ZHANG YUXIAO (CN)
ZHAO JUNBO (CN)
DU CHANGHUI (CN)

PCT/CN2022/133162

January 11, 2024

November 21, 2022

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HUNAN SINOBOOM INTELLIGENT EQUIPMENT CO LTD (CN)

F15B21/08; B66C13/06; B66C13/20; F15B11/042; F15B11/08; F15B13/04

CN217873567U	2022-11-22
CN115217820A	2022-10-21
CN104791310A	2015-07-22
CN113790182A	2021-12-14
CN114165490A	2022-03-11
JP2016089910A	2016-05-23

UNITALEN ATTORNEYS AT LAW CO., LTD. (CN)

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