Off-line processing and recycling equipment and method for finely separating and classifying tobacco leaf chippings

The invention is suitable for primary processing of raw materials in a tobacco leaf redrying workshop, and relates to off-line processing and recycling equipment and method for finely separating and classifying tobacco leaf scraps. Comprising a first-stage vibrating screen two-layer screening device, a first-stage gravity winnowing machine, a second-stage vibrating screen two-layer screening device, a second-stage gravity winnowing machine, a third-stage vibrating screen single-layer screening device and a fourth-stage vibrating screen two-layer screening device which are sequentially arranged in the direction of a tobacco leaf fragment conveying main line, and further comprises a cyclone dust collector and a circular vibrating screen. The classification of the tobacco flakes with the tobacco leaf chippings larger than 1.5 mm is mainly completed by adopting a (4 + 1)-level vibrating screen (namely a four-level main vibrating screen and a one-level branch vibrating screen) and a two-level gravity winnowing mac