screw conveyor

noun
a device for moving loose materials, consisting of a shaft with a broad, helically wound blade rotating in a tube or trough.
Also called worm.
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World English Dictionary
screw conveyor
 
n
engineering Also called: worm conveyor a duct along which material is conveyed by the rotational action of a spiral vane which lies along the length of the duct

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Each screw conveyor shall be driven by an electric motor connected to a gear
  reducer.
The conveying of solids requires that the screw conveyor rotate at a different
  speed than the bowl.
The screw conveyor conveys the excavated material to the first of a series of
  conveyor belts.
Screw conveyor system that provides a single point collection of spent bullets.
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