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    • 1. 发明专利
    • Hydraulic circuit for construction machine and control device therefor
    • 用于建筑机械的液压回路及其控制装置
    • JP2014009794A
    • 2014-01-20
    • JP2012148928
    • 2012-07-02
    • Sumitomo (Shi) Construction Machinery Co Ltd住友建機株式会社
    • HASHIMOTO HIROFUMI
    • F15B11/02E02F9/22F15B11/17
    • E02F9/2282E02F9/2242E02F9/2267E02F9/2292F15B11/16F15B11/17F15B2211/20546F15B2211/20576F15B2211/30595F15B2211/31517F15B2211/327F15B2211/41554F15B2211/45F15B2211/6346F15B2211/6652F15B2211/6654F15B2211/7142
    • PROBLEM TO BE SOLVED: To provide a hydraulic circuit for a construction machine or a control device therefor in which an inflow direction of a hydraulic solution to be confluent can be controlled by using a confluence circuit.SOLUTION: A hydraulic circuit 20 for a construction machine comprises a plurality of center bypass passages RC to which hydraulic solutions discharged from a plurality of hydraulic pumps P are supplied, respectively. The hydraulic circuit 20 comprises: a direction control valve group disposed in the center bypass passage in a tandem manner; a bleed-off valve Vbo disposed in a downstream center bypass passage in the direction control valve group; and a confluence circuit in which a hydraulic solution supplied to one of the plurality of center bypass passages is made confluent to the other center bypass passage. A direction control valve includes: a first internal passage RV1 through which the supplied hydraulic solution is caused to flow out to the center bypass passage; and a second internal passage RV2 through which the hydraulic solution supplied to the direction control valve is supplied to a hydraulic actuator. The confluence circuit includes a confluent direction control valve Vj which controls an inflow direction of the hydraulic solution to be confluent.
    • 要解决的问题:提供一种用于施工机械或其控制装置的液压回路,其中可以通过使用汇流回路来控制要汇合的液压溶液的流入方向。解决方案:一种用于施工机械的液压回路20 包括分别从多个液压泵P排出的液压溶液供给的多个中心旁通路RC。 液压回路20包括:以串联方式设置在中心旁通通道中的方向控制阀组; 设置在方向控制阀组中的下游中心旁路通路中的排气阀Vbo; 以及汇流回路,其中供给到多个中心旁通通道中的一个的液压溶液与另一个中心旁通通道汇合。 方向控制阀包括:第一内部通道RV1,供应的液压溶液通过该第一内部通道RV1流出到中心旁通通道; 以及供给方向控制阀的液压溶液通过该第二内部通道RV2供给到液压致动器。 汇流回路包括汇流方向控制阀Vj,该汇流方向控制阀Vj控制待汇合的液压溶液的流入方向。