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    • 3. 发明专利
    • BOOM SWING TYPE SHIP LOADER
    • JP2000313527A
    • 2000-11-14
    • JP12182099
    • 1999-04-28
    • ISHIKAWAJIMA HARIMA HEAVY IND
    • NOZAWA FUJIO
    • B65G67/60
    • PROBLEM TO BE SOLVED: To facilitate the linear moving of a load dropping hole by constituting a boom storing a conveyor so that the boom can swing around a fixed end and elongate and contract and controlling the elongating and contracting amount of the boom according to the swing amount of the boom. SOLUTION: When an operator performs a swing operation, rotation of an electric motor for revolution 11 via an inverter 16, traveling of a truck and swing of a boom 1 are performed by generation of a swing command based on a swing operation in a control system. At the same time, the swinging amount of the electric motor 11 for swing is detected as swing amount of the boom 1 by a swing amount detecting device 12 and is inputted into an arithmetic part 13 and target elongating and contracting amount is calculated. According to target elongating and contracting amount, an electric motor 14 for elongation and contraction rotates via an inverter 17, an inner frame boom 4 moves in the longitudinal direction for an outer frame boom 3 and the boom 1 elongates and contracts. At the same time, actual rotational amount of the electric motor 14 for elongation and contraction is detected as actual elongating and contracting amount of the boom 1 by an elongating and contracting amount detecting device 15 and a correction control is performed via the arithmetic part 13 when actual elongating and contracting amount deviates from target elongating and contracting amount.