| 摘要 |
A protrusion ( 21 b) is formed on a central region of an inner surface ( 21 c) of a first disc plate ( 21 ) constituting an end on an inclined lower side of a rotating drum ( 2 ). Particles ( 11 ) in the vicinity of the other end (first disc plate ( 21 )), which are lifted forward in a rotational direction as the rotation drum ( 2 ) rotates, are brought into contact with a surface of the protrusion ( 21 b) when the particles ( 11 ) flow backward in the rotational direction due to their own weights. Then, the particles ( 11 ) are guided by the surface of the protrusion ( 21 b) to thereby flow toward the inclined upper side. As a result, a stagnation phenomenon of the particles ( 11 ) in the vicinity of the other end (first disc plate ( 21 )) is less likely to occur.
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