| 摘要 |
1. A sifter with a vibratory drive with rectilinear or elliptical trajectory, equipped with a sieve with two or more longitudinal walls, joined via transverse beams and with a concave sifting surface mounted in the sieve, in the form of a sector of the surface of a cylinder made from a slotted sieve, characterised in that the concave sifting surface (5) in vertical longitudinal section has the shape of an asymmetric trough, the inlet section of which has an angle of inclination at the inlet edge (6) at least twice as large as the angle of rise of the outlet section at the outlet edge (7).<IMAGE>
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