Design of two-stage dust removal device and its application to tobacco cutter

In order to accurately control the air velocity in duct of centralized dust removal system for tobacco cutter and reduce cut tobacco loss, two two-stage dust removal units, a fixed filter screen dust box unit and a pneumatic separation rotational screen dust box unit, were designed for the SQ35 tobacco cutter cutting different materials. The fixed screen unit was designed for a single tobacco cutter and suitable to separate natural tobacco material from grinding wheel dust via negative pressure and filter screen. The pneumatic separation unit was designed for a processing line and suitable to materials containing reconstituted tobacco, the cut tobacco retained by the rotational screen in the pneumatic separation unit was recycled together with the fines came out of the vibrating screen, and the rotational screen was self-cleaned. The results showed that the two units could reclaim the cut tobacco carried by the dust removal system, the short strand proportion in reclaimed cut tobacco was below 3.5%, which could be added back to cut tobacco flow directly; and save 16 875 kg of cut tobacco per year.