| 摘要 |
A screw press ( 1 ) for pressing fibrous material, in particular sugar beet pulp, comprising:-a pair of adjacent counter-rotating shafts ( 20, 30 ) having their axes (X-X, X'-X'), disposed parallel to each other, said shafts ( 20, 30 ) each being provided externally with a helical structure winding in the opposite direction to the helical structure of the other shaft;-a perforated walled filtering cage ( 4 ) enclosing said helical structures ( 21, 31 ) as an exact fit;-a loading hopper ( 10 ) for feeding the fibrous material to the press ( 1 );-a discharge aperture ( 11 ) for the exit of the pressed material;-a collection sump ( 12 ) positioned externally to said filtering cage ( 4 ); in which each box-like helical structure ( 21, 31 ) comprises a helix ( 22, 32 ) and a helical element ( 23, 33 ), comprising at least one perforated surface ( 24, 34 ) and forming a helical interspace ( 27, 37 ) with the outer surface of the shaft ( 20, 30 ), said perforated surface ( 24, 34 ) having a length (L) along the axis (X-X, X'-X') of the shaft ( 20, 30 ) which at every point is less than the pitch (P) of the helix ( 22, 32 ) by an amount sufficient to receive the helix ( 32, 33 ) of the adjacent shaft ( 30, 20 ).
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