The trailing suction hopper dredger is a suction type. By inhalation of mud placed in the hull on both sides or the rear of the rake head, suction to the side of the side navigation. Trailing suction hopper dredger motor flexibility, high efficiency, anti-wave and strong, suitable for coastal ports, the wide river and ship anchorage operations. Dredger (in Zhejiang) 
 ? Chain bucket dredger series with bucket bucket chain, by the upper guide wheel, driven by continuous rotation in the bucket on the bridge, so that the hopper dredging under water and raised to above the water, with the progress retractable front, back, left and right to throw the anchor cable, so that the hull forward or side to side to carry out the dredging work. Dig the soil, raised to the top of the bucket tower, pour mud trap, slip mud tank discharged into the mud barge docked next to the dredger, and then drag occasional round mud barge dumping areas relieved. Strong, chain bucket dredger on the soil's ability to adapt to a variety of soil excavation outside of the rock, and even mining capabilities, Trench cross-section rule, the error is extremely small, the most suitable port berths, hydraulic structures and other specifications. requirements more stringent engineering facilities, so there is a certain range of applications. ? Cutter suction dredger is the sparse Beach project, the use of a ship, it is use around the front of the suction pipe, suction pipe, the installation of rotary cutter knife device for cutting the bottom of the river sediment and stir, then The suction tube to twist from the sediment materials with a strong pump power delivered to the accumulation of sediment material field, it's working process of dredging, dump, dumping, a continuous complete, it is a high efficiency The lower cost of the dredger, underwater mining machinery. ? Bucket dredger is a single-bucket dredger, it can concentrate all power in a bucket, the mining of special hardware. It uses the boom and bucket handle bucket into the water, insert the bottom of the river, seabed mining, and then the winch pulling together to enhance the bucket together with the shank, boom, hanging out of the water to the proper height, by cycle the device to turn , opened the bucket to the dumping of mud or mud lighter mud relieved, and then anti-go to the dredging location. Cycle operations. Bucket dredger for the mining of coral reefs, hatching stone, gravel, the size of the stone and clay, coarse sand and mixtures. ? Grab dredger is the use of rotary excavators, boom and wire rope to hang hopper into the seabed; grab itself the weight of the crawl soil. And then start fighting winch, to Grapples request through the boom at the top of the pulley will grab off, rising, and then turn the dredge to a predetermined point (or mud lighter) mud relieved. Dredge back to excavations, dredging, and so the cycle operation. The grab dredger is mainly used for digging clay, silt, hatching stone, should grab the fine sand and silt. There blow the mud boat.