... most widely used engineering ship in dredging works and sand production. The rotary cutter head at the ... suction dredger: dredging river, dredging sand, desilting, reclamation for channels and land, and building roads. DRAWINGS : Qingzhou Yuanhua ... extracting equipments , sand sieving machines, crusher , weathering sand producing lines (break , rinsing and separating ), and various kinds of machines ...