1. this ball mill, a horizontal type and tubular running device, has two chamber. this machine is grid type. the material enters first warehouse spirally and evenly along the input material hollow axis by input material device. 2. in this chamber, there is a ladder scaleboard or ripple scaleboard, and different specification steel.2. after grinding system has started, please turn on the rod valve in the bottom of raw coal storage, and start sealing measuring belt to coal mill, then raw coal will be dryed and ground in the vertical coal mill. 3. the mixture of hot air or waste gas of cement production line are sucked into vertical coal mill, under blower’s function.