Patent ID: 8925844
Filing Date: 2015-01-06
Classification: B02C

Abstract:
1. Roller mill having a grinding chamber and a rotating grinding pan, on which resiliently impacted grinding rollers roll and grind feed material which is fed to the grinding pan with the aid of a feed system, having a classifier above the grinding chamber, to which the ground grinding material is fed in an ascending gas flow and having a grit cone for coarse grain rejected in the classifier and dropping down which passes via a conical opening back into the grinding chamber and to the grinding pan for renewed grinding, wherein the feed system comprises a screw feeder which is integrated in the region of the grit cone into the roller mill and is formed in such a way that the feed material is conveyed into the roller mill and centrally fed to the grinding pan, characterised in that the screw feeder comprises a screw shaft which cuts the longitudinal axis of the roller mill and is arranged on both sides respectively outside of the roller mill, the screw shaft is connected at one end with a drive means and is positioned at the other end in a bearing and the drive means and the bearing are arranged outside of the roller mill.