The rake suction dredger sucks in sediment through suction pipes and transports it to the mud tank on the ship. This type of ship is suitable for operation in wide and sandy waters. The cutter suction dredger uses a cutter device to cut the sediment and transport it to a designated location through a mud pump and pipeline. It has strong excavation ability and is suitable for various complex water environments.

Dredgers mainly handle soft materials such as silt and silt, which usually contain high moisture and viscosity. The sand dredger mainly deals with hard substances such as sand and soil, which are relatively dry and loose. There are significant differences between sand dredgers and dredgers in terms of ship type design, working principles, applicable scenarios, and operating objects. These differences make them play irreplaceable roles in specific engineering fields.