... 2. Good seal performance, good transportation efficiency. Screw conveyor LSY type series spiral conveyor is a kind of new equipment with closed ... material, such as clay powder, pulverized coal, cement, sand, grain, small lumps, pebbles and cast iron chip, etc. Not ... material, which includes: clay powder, pulverized coal, cement, sand, grain, small piece of coal, cobble, and cast iron filings, etc ...