JPS6470155A - Vertical mill equipped with rotary classifier - Google Patents

Abstract

PURPOSE: To eliminate the collision of the ascending streams and descending streams of the pulverizing grains in a mill and to improve efficiency of pulverization by providing the mill with a funnel-shaped classifying machine casing which encloses the rotary vanes of a classifying machine and has openings on an inclined flank. CONSTITUTION: Hot air A is supplied from a throat ring 6 disposed in the lower part of the mill casing 1 into the mill and the pulverizing materials pulverized between pulverizing rollers 4 and pulverizing rings 5 are dried while the materials are transferred on the upper part 7 of the throat. At this time, coarse particles are separated from the air streams and are returned onto a pulverizing table 3. On the other hand, the pulverizing materials contg. the fine particles flow through the slits 17 of the classifying machine 11 casing 16 into the inlet 11a of the classifying machine 11 and the coarse streams are blown off toward the outer side by the rotary vanes 14 and are lowered by their own weight along the inside surface of the casing 16 and are returned from a return port 18 onto the table 3. The fine grains are carried together with the air flow toward the central direction and are emitted to the outside of the system from a discharge pipe 15.