... reasonable price 3. high technology 4. less maintenance Screw Conveyor1. characteristics Screw conveyor novel structure, technical index is advanced, the ... small block material, such as cement, coal, grain, fertilizer, ash, sand etc, material temperature 200 degrees Celsius. Screw conveyor ... make the spiral machine can't work normally. Screw conveyor spiral diameter from 200 mm to 500 millimeters, ...