How does the smoke and dust purifier remove dust?

Fume purifier working principle:

Fan start, under negative pressure, the workshop welding fume through the universal suction arm hood mouth inhalation equipment, suction arm end is equipped with a fire-blocking network, large particles of sparks are blocked by the fire-blocking network, welding fume exhaust into the filter room, welding fume exhaust flow in the filter room, the use of gravity and the upward airflow, first of all, the coarse particles of fume will be directly to the ash drawer, welding fume with particulate dust is blocked by the cylindrical cartridges, the filtering effect in the screening, the particulate dust is blocked to the surface of the filter, after filtering and purification, from the center of the filter into the clean room, the filter is cleaned by the filter. Under the effect of screening and filtering, the particulate dust is blocked on the surface of the filter cylinder, and after the welding fume is filtered and purified, it flows into the clean room from the center of the filter cylinder, and then discharged through the air vent.