... avaliable; 3. ISO9001-2008. Concrete screw conveyor1.Carbon steel2.used in chemical, cement, pharmacy, iron & steel and foodstuff industry ... hopper material discharging and as a kind of fast amount in 5% of the required accuracy, under the circumstance, ... power, food, abrasive, abrasive tools, etc, and make various industries in environmental protection got very big improvement, and reduce the energy ...