The dredger is across the battlefield, professional machine of sand-excavating in the river (can also be used to modify the channel of the river), the reliable performance, convenient maintenance and long service life and cost very little, workload big (every day 500-5000 cubic meters or so), and many other advantages, dig sand screen separation of the sandy pure, after without impurities, is building precast cement homework with sand ideal.The explosives by mechanical received by customers at home and abroad.