when starting the dust removing grinder, grinding wheel machine, and a dust collector will start at the same time, dust particles produced by grinding the workpiece in the fan suction wind into the settling chamber, large particles, particles of dust dropped in ash drawer deposition, which can make spark, fire star cooling, fine dust with the air enter the filtering chamber, when passing through the filter bag dust is attached on the surface of the filter bag, the purified gas passes through the fan inflow of clean room, the rear silencer discharged into the atmosphere.