| 摘要 |
A vertical screening device (1) for a separator. The screening device (1) comprises a cylindrical, rotatable screen (2), a bearing means (3) fixedly connected with the screen (2), and a non-rotatable feeding screw (4) coacting with the screen (2) and supported by the bearing means (3). The feeding screw (4) is, via a link extending beyond the cylindrical surface of the screen, connected to the stationary housing (31) of the separator. The feeding screw (4) comprises a non-yielding helical portion (14) and an elastic helical portion (15). The invention is characterised in that at least a section of the feeding screw (4) between the uppermost and lowermost portion makes an acute angle .alpha. with the cylindrical surface of the screen (2), the upper side of the feeding screw in this section being inclined downwards from the interior (13) of the screw towards the cylindrical surface of the screen.
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