| 摘要 |
PURPOSE:To raise the power-saving efficiency of grab bucket during its elevating period by a method in which a weight elevating device is provided to a working base on a grab dredger and the weight of the grab bucket is partly offset by the weight vertically moving along the weight elevating device. CONSTITUTION:A weight elevating device 13 is provided on the back of the working base 5 of a grab dredger 1. The device 13 is provided with a fixed pulley 14, a mobile pulley 15, and a weight 16. The other end part of a load regulating cable 20 whose one end is coupled with a grab bucket 17 is coupled with the coupler of the device 13 through both the pulleys 14 and 15, and an emergent cable 26 from an emergent winch 12 is likewise coupled with the coupler of the device 13 through the pulleys 14 and 15. Thus, when raising the bucket 17, for example, the main cable 19 and an auxiliary cable 25 are wound up by the main winch 10 and an auxiliary winch 11 and the emergent cabel 26 is rewound by the emergent winch 12, and thereby the bucket 17 is allowed to rise under a condition that part of its weight is offset by the weight 16. |
