... used widely 4 ISO9001:2000 Summary 1 the LS type screw conveyor are devided to single drive and dual drive forms ... , coal, machinery, light industry, food and the food industry. 3 spiral chute conveyor is suitable for conveying powder, granular, small block ... of material, such as cement, coal, grain, chemical fertilizer, ash, sand, coke, etc, not transport perishable, Viscous, and easy caking materials ...