Milling system for materials of different grain sizes - has mill and sifter by=passed by fine material for delivery to separator

摘要

The milling system for materials of different grain sizes, has corresponding bunkers (2, 3, 4) for these materials, discharging onto belt conveyors (23, 24, 25, 26). Material from the first two bunkers (2, 3) is passed through a double flap into the horizontal cylinder mill (1) followed by a pneumatic sifter (5) and a cyclone separator (6). Coarse material from the sifter returns through a line (9) to the mill. The material in the last bunker (4) which is already sufficiently fine, is delivered from its conveyor (26) by a line (27) to a lock (28) in the line (10) between the sifter and separator (6). The circulation of the material is caused by a fan (7) connected by an extraction line (11) with the separator (6) and with a return line (12) to a flap valve (14) for the input to the mill and connected by another flap valve to a branch line (16) connected to the output of the mill.