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    • 6. 发明申请
    • FLOW CONTROL VALVE FOR CONSTRUCTION MACHINERY
    • 用于建筑机械的流量控制阀
    • US20150159678A1
    • 2015-06-11
    • US14411717
    • 2012-07-19
    • Jin-Wook Kim
    • Jin-Wook Kim
    • F15B11/024F15B11/04F15B13/02
    • F15B11/024E02F9/2267F15B11/0406F15B11/0426F15B13/021F15B13/0403F15B2211/205F15B2211/20576F15B2211/30565F15B2211/3133F15B2211/31582F15B2211/355F16K11/07Y10T137/87193
    • Disclosed is a flow control valve for construction machinery, the flow control valve being adapted to reduce pressure loss due to flow on return to a hydraulic tank during the boom-down operation of a large-scale excavator. The flow control valve for construction machinery according to the present invention comprises: first and second boom spools which are respectively coupled to first and second boom valve blocks, and which regulate working fluid that is respectively supplied from first and second hydraulic pumps to a boom cylinder during direction reversal; a boom-up flow-adjusting means which, in direction reversal of the first and second boom spools for boom-up drive, supplies working fluid from the first and second hydraulic pumps into a large chamber of the boom cylinder via the first and second boom spools respectively, and causes part of the flow of working fluid from the second hydraulic pump to pass via the second boom spool so as to be combined with working fluid being supplied from the first hydraulic pump to the large chamber of the boom cylinder due to direction reversal of the first boom spool; and a boom-down flow-adjusting means which, in direction reversal of the first and second boom spools for boom-down drive, causes part of the flow of working fluid coming back from the large chamber of the boom cylinder to return to the hydraulic tank via the first and second boom spools respectively, and causes part of the flow of working fluid coming back from the large chamber of the boom cylinder to combine as respective regenerative flows for working fluid on the small chamber side of the boom cylinder.
    • 公开了一种用于工程机械的流量控制阀,该流量控制阀适于在大型挖掘机的动臂下降操作期间减少由于返回到液压油箱时的流量而导致的压力损失。 根据本发明的用于工程机械的流量控制阀包括:第一和第二悬臂线轴,其分别联接到第一和第二悬臂阀块,并且将分别从第一和第二液压泵供应的工作流体调节到动臂缸 在方向反转时 一个动臂上升流量调节装置,其在第一和第二悬臂起动驱动器的方向反转中,将来自第一和第二液压泵的工作流体经由第一和第二起重臂提供到动臂缸的大腔室中 并且使得来自第二液压泵的工作流体的一部分流动经由第二起重臂卷轴通过,以便与从第一液压泵供应到工作液体的工作流体相结合,由于方向 反转第一个吊杆; 以及动臂下降流量调节装置,其在第一和第二动臂用于动臂下降驱动的方向反转中使得从动臂缸的大腔返回的工作流体的一部分流动返回至液压 并且使得从动臂缸的大室返回的工作流体的一部分流动被组合为在动臂缸的小室侧上的工作流体的各自的再生流。