Patent ID: 11919269

Abstract:
A screw feeder includes a pipe, feed screw, rotatory shaft, dewatering holes, anti-rotation bars extending inside the pipe and protruding towards the feed screw, an inlet to receive solid-liquid mixture, and an outlet to discharge partially dewatered solid. The pipe includes at least one pipe section having a first peripheral zone in a vertically lower area with dewatering holes but no anti-rotation bars and a second peripheral zone in a vertically upper area with anti-rotation bars. A pipe profile includes two differently shaped profiles, a first and second pipe profile are selected from a square-shaped, partly circular, and a partly elliptically-shaped profile. The first pipe profile is selected to enable outer edges of the feed screw to remove material overlying the dewatering holes, and the second pipe profile is selected to prohibit contact between the outer edges of the feed screw and the anti-rotation bars.