PURPOSE: To control the operational speeds of an oil-pressure cylinder by using a system in which output signals from a rocking displacement amount detector and an operational direction detector are put in a controller, and command output signal from the controller is put in an oil-pressure cylinder flow rate regulator.
CONSTITUTION: The first detector 11 to send out the detected signal of rocking displacement amount of an arm cylinder 4 is fixed to upside of a boom 1, and the tip of the movable contactor of the detector 11 is rotatably fixed to the downside of the external cylindrical shell of the cylinder 4. The second detector 12 to send out detected signal of the operational direction of an operating lever 18 is provided, and a controller 13 for a micro computer to receive output signals of the detectors 11 and 12 is provided. A direction switch valve 14, an oil- pressure pump 15, a servo cylinder 16 and a switch valve 17 are provided to a flow rate regulator. Command output signal of the controller 13 is put in the switch valves 14 and 17 to adjust the discharge amount of the pump 15 and the operational speed of the cylinder 4 is controlled. The vibration of the cylinder 4 can thus be suppressed.
ICHIYAMA SHIYUUICHI
AOYANAGI YUKIO
UNO KEIICHIROU
YASUDA TOMOHIKO
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