... .Arc air channel; 3.ISO9001:2000,CE; Trapezium Mill,Mill Machine,MillMill Machine - MTW Medium Speed Trapezium MillMTW European Trapezium Grinding Mill ... just around the main shaft, but also around the grinding ring, besides, rollers can rotate to itself as well because of ... rollers, materials will be fed into space between rollers and ring to form a material layer, which will be grinded due ...