Πρόκειται για μηχανή/σύστημα μεταφοράς/φόρτωσης/εκφόρτωσης χύδην προϊόντων, σιταριού, καλαμποκιού, κλπ κλπ, που βασίζεται στην έλικα του Αρχιμήδους.

https://www.math.nyu.edu/~crorres/Archimedes/Screw/conveyor/...

Archimedean screw
Machine for raising water, said to have been invented by Archimedes for removing water from the hold of a large ship. One form consists of a circular pipe enclosing a helix and inclined at an angle of about 45°, with its lower end dipped in the water; rotation of the device lifts the water in the pipe. Other forms consist of a helix revolving in a fixed cylinder or a helical tube wound around a shaft.