The cut-off extraction tower consists of an outer tower shell (1) which has a screen (3) of the bottom (12) of the central tube shaft (2), which has a sieve (3) on its inner lining of the guide surface (9) and which has a length of the transport blade (10). The tubular shaft (2) is supported at its end in a bearing and at its upper end is provided with a drive for rotating with a plurality of drive units (19). These drive units (19) are distributed around the periphery of the tubular shaft (2), are connected to the tower shell (1) and engage the pinion gear (20) to the ring gear (21) on the tubular shaft (2). to the downstream end of the sieve (3) of the bottom by a pin (13) with a clearance in the slide bearing (14) to which the bottom screen (3) of the bottom (12) engages.
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