| 摘要 |
PURPOSE:To raise the efficiency of dredging operation by a method in which set input data on dredged soil quality are compared with suction negative pressure and input power of pump in the dredging condition, and when these do not agree with desired conditions, drag arm is raised to a proper condition. CONSTITUTION:Input power value for judging closed state, suction negative pressure, an optimal sludge content rate for dredging, corresponding input power value and suction negative pressure value, and input power value and suction negative pressure for judging the releasing of closed state are put from set value input unit 17 into an arithmetic unit 18. A sequence program of drag arm operation is also put in the unit 18. When dredging work is started, results from a suction negative pressure detector 15 and an input power detector 16 are compared with a set value for discriminating the closed state to judge whether it is closed. In the case of closing, a winch 5 is driven, and when the winding amount of the drag arm reaches a set value, it is judged whether it is low sludge content rate. In the case of low sludge content rate, the drag arm is stagewise rewound to discriminate whether it is proper sludge content rate.
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