The dust collector is a larger scale dust collector. It has the features of big airflow handling, good ash removal efficiency, high dust collecting efficiency, reliable drive, easy maintenance and small covering area. It is widely used in metallurgy, electric industry, chemical industry, building materials and so on. It consist ash bucket, filter chamber, net gas chamber, frame, lifting valve, ash removal device and so on. When operating, gas with dust comes to ash bucket via air channel and large dust particles fall to ash bucket bottom directly and smaller dust comes to filter chamber with air turning up. It is retained on the outer surface and purification gas comes to bag and discharges from exhaust port.