PRESS SCREW FOR EXTRACTION OF OIL FROM OIL-CONTAINING RAW MATERIAL Russian patent published in 1998 - IPC

FIELD: press mechanisms of special-purpose presses, in particular, press screws for extraction of oil from oil-containing raw material. SUBSTANCE: process screw uses a set of bushes with screw flights and smooth intermediate bushes. Bushes with screw flights and smooth intermediate bushes are made in form of a pack pf separate split screw washers of different outside diameter. Lead of screw washers equals lead of screw flights. screw design makes it possible to produce most heavy-duty screw sections in the form of separate split screw washers by a simple stamping operation. EFFECT: facilitated procedure. 1 dwg