| 摘要 |
PROBLEM TO BE SOLVED: To improve operability, and achieve low cost in storage control for storing a crane in a storage attitude (travel attitude) by carrying out sequential control under simultaneous two-action drive for enabling stable control. SOLUTION: A controller 27 outputs valve switching signals to switch an extension control valve 16 to the contracting side, and a winch control valve 18 to a winding side based on an operation signal of a storage instruction switch 25 for instructing storage of the crane. Contracting move of a telescopic boom 7 and winding action of a hook block 10 are thus simultaneously driven. Based on an operation signal from a falling operation means 23, valve switching signals to the extension control valve 16 are disconnected, and a valve switching signal for switching a falling control valve 17 to the falling side is outputted, and falling action of the telescopic boom 7 and winding action of the hook block 10 are simultaneously driven. COPYRIGHT: (C)2006,JPO&NCIPI
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