| 摘要 |
PROBLEM TO BE SOLVED: To provide classifying equipment for powder and granular materials, etc., which is capable of sufficiently and surely classify pulverized materials of, for example, polyethylene terephthalate bottles, etc., even if the ranges of the grain size and grain size distribution of the classifying materials are wide. SOLUTION: A bottom end opening 32 of a cyclone column 3 constituted in such a manner that the descending vortexes swirling along an inner peripheral wall are formed by the air streams containing the powder and granular material, etc., AB sucked along the inner peripheral wall and the forces of suction act upward in the central part of the vortexes is connected to a powder and granular material introducing cylinder 14 in the upper part of an inner cylinder 13.
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