HD Series bag dust filtering device is designed for dust filtering in top silo, bottom silo, belt conveyor and local dust source and can be also for dust filtering of local dust source in other industries. It has advantages of small cubage, high capacity of treatment, compact structure, easy and reliable cooperation. The dust removed from the dust filter can be released into the silo directly or falling on the belt. The dust gas is sucked into the dust filter from the bottom and the clean gas is exhausted through the blower machine after being filtrated by the filtering bag. After working for a period of time, the resistance of the filtering bag increases with the increase of dust amount in the filtering bag, so the dust is required to remove to make the dust filter back to work as normal. There are six specifications of the HD Series bag dust filtering devices: A with dust door, B with drawer and C neither dust door nor drawer and the bottom flange is installed in silo top, top and belt conveyor for dust filtering on site according to the user’ requirements and dust is recovered directly.