Raymond Mill powder materials in the grinding machine, fan casing will be entered in the wind, blowing powder grinding room at the top of the analyzer for sorting through fine and coarse materials falling into the weight room grinding mill, small meet the specifications of the airflow into the whirlwind with the collector, collected by mouth from a powder, which is refined . Merry collected by the whirlwind return to the top of the duct back to the fan, wind direction is the cycle, and under negative pressure flow of wind direction the wind increased some of the intermediate host and fan exhaust pipe emissions, and the collection of small whirlwind, purification.