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Title:
HYDRAULIC PRESSURE CONTROL DEVICE FOR COMBINED OPERATION OF OPTIONAL DEVICE AND FRONT OPERATION DEVICE OF CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2013/111948
Kind Code:
A1
Abstract:
The present invention relates to a hydraulic pressure control device for the combined operation of an optional device and a front operation device of construction machinery. The hydraulic pressure control device comprises: a plurality of valve units controlled in order to supply a working fluid to a plurality of respective front operation devices connected in series to a hydraulic line; a plurality of operation portions controlled in such a manner as to supply a pilot working fluid to the plurality of valve units; a plurality of pressure sensor units detecting the pressure of the pilot working fluid discharged from the plurality of operation portions; an optional device control valve unit connected to the hydraulic line and controlling the supply of the working fluid to the optional device; an operation unit where a proportional current value is generated so as to supply the pilot working fluid to the optional device control valve unit; and a control unit controlled in such a manner as to supply more of the working fluid flow to the plurality of valve units by decreasing the spool displacement of the optional device control valve unit to below the spool displacement corresponding to the proportional current value when a request is made for the simultaneous operation of the front operation device and the optional device. Representative drawing: Fig. 1

Inventors:
LEE BONG JIN (KR)
Application Number:
PCT/KR2012/011354
Publication Date:
August 01, 2013
Filing Date:
December 24, 2012
Export Citation:
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Assignee:
DOOSAN INFRACORE CO LTD (KR)
International Classes:
F15B13/02; E02F9/22
Foreign References:
JP2002115274A2002-04-19
JP2004124377A2004-04-22
JP2001099106A2001-04-10
KR20100010204A2010-02-01
Attorney, Agent or Firm:
HANBEOT PATENT LAW FIRM (KR)
특허법인 한벗 (KR)
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Claims: