Helical Screw Conveyor.

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A screw conveyor, also called auger conveyor, is a device that employs a helical screw blade, or "flighting", rotating within a tube to transport liquid or granular materials. Widely used in bulk handling industries, these conveyors often function horizontally or at a slight incline for moving semi-solid substances like food waste, wood chips, aggregates, cereal grains, animal feed, boiler ash, meat and bone meal, municipal solid waste, and more.