The working principle of dust collector is as follows: dusty gas from the lower open flange into the filtration chamber, coarse particles fall directly into the ash bin, dusty gas filtered by the bag, dust is retained in the bag surface, the net gas through the mouth of the bag to the net gas chamber, by the fan discharged into the atmosphere. When the dust on the surface of the bag is increasing, the programmable control instrument starts to work, and opens the pulse valve one by one, so that the compressed air through the nozzle of the filter bag is blown to clean up the dust, so that the bag suddenly expands, and under the action of the reverse airflow, the dust on the surface of the bag is given to the bag to quickly detach from the filter bag to fall into the ash bin, and the dust is discharged from the ash removal valve.