The ship is drilling pumping sand can be made with the welfare of the hull and is located on a boat to the rotation of the crane (crane). Derrick crane device on the turntable, can rotate with the rotary disc (may also be appropriate to change).
其挖沙作業(yè)過程是起重吊桿將抓斗轉(zhuǎn)動到預(yù)定的挖掘地點，將抓斗放在接近水面時，松開絞車鼓輪，讓已經(jīng)張開的抓斗在自重作用下，在水中垂直下落，當(dāng)抓斗到達你面，斗齒破土插入泥沙中。
The process of dredging operation is derrick will grab bucket is rotated to a predetermined excavation site, grab at or near the surface of the water, release the winch drum, let already open to grab in under the action of gravity, vertically in the water drop, when the grab bucket to reach you, bucket teeth ground into the mud and sand.
此后，絞緊閉斗纜索，抓斗閉合。將抓斗起吊出水后，吊桿旋轉(zhuǎn)至預(yù)定卸沙處(運輸船或車輛等)。自航式抓斗挖沙船本身設(shè)有沙艙，非自航式的另配運輸船。
Since then, bear close bucket cable, closed grab. The grab bucket lifting water, hanger rotates to a predetermined place (unloading sand transport ship or vehicle). Self propelled grab dredger itself with sand tank, non self propelled by another transport ship.
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