B - Operations – Transporting – 30 – B
Patent
B - Operations, Transporting
30
B
B30B 9/14 (2006.01) D21B 1/00 (2006.01)
Patent
CA 2534113
A screw for a compression dewatering device comprising an elongated shaft having axially spaced apart first and second ends, a conveying section at the first end of the shaft, having a single helical screw flight rigidly projecting from the shaft, a flightless transition section axially adjacent the conveying section, and a dewatering section axially adjacent the transition section, having a double helical screw flight rigidly projecting from the shaft. Another embodiment is a compression screw having a perforated tubular dewatering wall intermediate the ends, followed by an imperforate spool wall at the discharge end. The screw includes a central shaft, a conveying section extending axially from the inlet end of the shaft, having a single helical screw flight rigidly projecting from the shaft, a flightless plug section extending axially from the discharge end of the shaft, within the spool wall, and a dewatering section adjacent the plug section, having a double helical screw flight rigidly projecting from the shaft. A flightless transition section is situated between the conveying section and the dewatering section. A gravity feed device is operatively associated with the inlet end for depositing bulk solids material through the feed opening onto the conveying screw, and a drive system is operatively connected to the inlet end of the screw for rotating the screw in the housing.
Keller Joseph L.
Kraft Michael J.
Riotto Anthony M.
Andritz Inc.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
LandOfFree
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