The dredger's mission is to carry out the construction of the underwater earthwork, which is to dig deep, widen and clear the existing channels and ports; Open new channels, ports and canals; Dredging dock, dock, lock and other hydraulic structure of the base groove and the digging up of the sediment into the deep sea or blowing into the land and land.Bucket dredger is the use of a series with a scoop of bucket chain, borrow on the idler pulley, continuous rotation in the pipe bridge, make the bucket dredging and underwater rose above the surface of the water, and to collect put forward, backward, left, right behind the mooring line, make the reach of hull or swinging for dredging work. The soil is dug up to the top of the tower, and the mud well is poured into the mud trap. The dredge is unloaded into the mud barge at the dredger, and then the mud barge is used to remove the mud from the dredging area. Bucket dredger's ability to adapt to the soil is stronger, but invisible outside of all kinds of soil, rock and mining capacity, excavated section rules, the error is very small, the most suitable port berths, hydraulic structures and other specifications is to require the strict engineering, it has certain application scope.