Grab the use of underwater excavation of earth and sand dredger. Mostly box-shaped hull with one or two can be rotated 360 ° grab the machine on the deck. Grab flat, semi-tooth, the whole tooth and petal type. Grab dredger self-propelled and non-self-propelled, self-propelled hopper has a boat, after the hopper is full, the boat since Hangzhi throwing mud at throwing mud. Non-self-propelled dredger barge loaded with mud mud. Dredger dredging depth of 3 to 60 meters, the production capacity of 20 to 400 cubic meters per hour. .