A screw conveyor, also known as an auger conveyor, utilizes a helical screw blade which rotates in a tube mechanism to move liquid or granular materials. They are employed in varied bulk handling industries. One of the most effective and cheaper ways of moving bulk materials is by using a Screw Conveyor design which is simple. Alternatively, a drag chain conveyor is a kind of conveyor... https://startups.snapmunk.com/blog/efficient-material-handling-solutions-screw-conveyors-and-chain-drag-conveyors