| 摘要 |
PROBLEM TO BE SOLVED: To propose an operating range control device for a boom-type working vehicle provided with a telescopic boom composed of upper and lower two booms, under the consideration that though an operating range of the telescopic boom in a conventional vehicle is controlled by AWL or SML, but the boom can not reach the maximum operating range even though the operating range has allowance in the AWL control and the labor hour for making up the operation is needed in the AML control. SOLUTION: In the boom-type working vehicle provided with telescopic lower boom 2 and upper boom 3, the operating range of the lower boom is operated and controlled by a lower operating means 5 on the basis of an upper boom virtual rated moment value, a lower boom length detection value, and a lower boom derricking angle detection value under the assumption that the inverting moment of the upper boom becomes a constant value at a dangerous side, and the operating range of the upper boom is controlled independently from the control of the lower boom by operating the moment around a support of the upper boom, by an upper operating means 6 on the basis of the upper boom derricking angle detection value and the upper boom load detection value, whereby the operating range of the telescopic boom can be enlarged.
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