| 摘要 |
PROBLEM TO BE SOLVED: To realize an exact hook horizontal movement control in a control device for a crane constituted such that a derricking motion of an telescopic boom 3 and the winding-down and -up motions of a winch device 12 are interlocked and driven by feeding a control oil from a derricking control valve 8 to a derricking cylinder 9 and a winch motor 11. SOLUTION: The winch motor 11 is constituted by a variable displacement motor. A boom operation state detection means 29 for detecting the operation state of the telescopic boom 3; and a delivery capacity control means 26 for driving/controlling a delivery capacity variable means 11c such that a hook 5 is moved while maintaining a predetermined hanging down height H when the derricking cylinder 9 and the winch motor 11 are interlocked and driven by a control oil from the derricking control valve 8 based on a detection signal from the boom operation state detection means 29 are provided.
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