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Stacked spiral sludge dewatering machine features: sludge dewatering machine using automatic update cake filtration technology replaces the traditional sieve filtration, self updating cake filtration technology to ensure the continuous stability of slurry dewatering separation effect, strong pressure generated by the screw diameter and pitch change, small gap between the ring and the fixing and swimming ring, realize the sludge dewatering extrusion, solid-liquid separation equipment is a new type of.