To provide a speed increase valve device properly switching a speed increase circuit according to presence or absence of a load borne by a double-acting hydraulic cylinder.SOLUTION: A speed increase valve device includes a controller 3 for determining magnitude of a load borne by a double-acting hydraulic cylinder 10, and a speed increase valve 20 for switching a speed increase circuit on the basis of a control signal from the controller 3. The controller 3 transmits a control signal for speed mode to the speed increase valve 20 when the magnitude of the load is determined to be a prescribed load or less, and transmits a control signal for ordinary mode to the speed increase valve 20 when the load is determined to be the prescribed load or more, and the speed increase valve 20 expands a rod 13 at an increased speed by opening the speed increase circuit 20k when the control signal is for the speed mode, and expands the rod 13 at a normal speed by blocking the speed increase circuit 20k when the control signal is for the ordinary mode.SELECTED DRAWING: Figure 1
【課題】複動油圧シリンダが担う荷重の有無に応じて増速回路を適切に切り替え得る増速弁装置を提供する。【解決手段】複動油圧シリンダ10が担う荷重の大小を判断するコントローラ3と、コントローラ3からの制御信号に基づいて増速回路を切り替える増速弁20とを備え、コントローラ3は、荷重の大小が所定以下と判断したときは、スピードモード用の制御信号を増速弁20に送り、荷重が所定以上と判断したときは、通常モード用の制御信号を増速弁20に送り、増速弁20は、制御信号がスピードモード用のときは、増速回路20kを開いて増速された速度でロッド13を伸長させ、制御信号が通常モード用のときは、増速回路20kを遮断して通常の速度でロッド13を伸長させる。【選択図】図1
SPEED INCREASE VALVE DEVICE
増速弁装置
2020-01-16
Patent
Elektronische Ressource
Japanisch
SPEED INCREASE VALVE AND FOLDING TYPE CRANE INCLUDING THE SAME
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