... widely 4 ISO9001:2000 Summary 1 the LS type screw conveyor are devided to single drive and dual drive ... forms. 2 LS-type screw machine has been widely used in various departments of ... for conveying powder, granular, small block of material, such as cement, coal, grain, chemical fertilizer, ash, sand, coke, etc, ... and uniform conveyor. 6 ISO9001:2000certificate LS type screw conveyor