| 摘要 |
PROBLEM TO BE SOLVED: To provide a fine grinder having an enhanced grinding capacity resulting from its prolonged abrasion resistance and elimination of a fluctuation in its grinding power which increases the effectively usable motor power both attained by causing its rotor and stator to evenly wear down across the raw material feed side and the discharge side thereof. SOLUTION: Radial grinding grooves 8A of a stator 8 of the fine grinder are formed and disposed in such a manner that a locus circles c2 in the groove 8A drawn around the center p2 of a curvature of a circularly arced bottom face 8c of the groove 8A stays within the locus circle 8M of the inner diameter of the stator 8. A steeply sloped side-face 8a and a gently sloped side-face 8b facing each other constituting the groove 8A have mutually different tilt angles. Radial grinding grooves 7A of a rotor 7 of the fine grinder are formed and disposed in such a manner that a locus circles c1 in the groove 7A drawn around the center p1 of a curvature of a circularly arced bottom face 7c of the groove 7A stays within the locus circle 7M of the outer diameter of the rotor 7. A steeply sloped side-face 7a and a gently sloped side-face 7b facing with each other constituting the groove 7A have mutually different tilt angles. A gap G between the inscribed circle of the stator 8 and the circumcircle of the rotor 7, the diameters of the locus circles in the radial grooves, and the pitches p of the radial grooves are reduced stepwise to the direction from the raw material feed side to the discharge side. COPYRIGHT: (C)2007,JPO&INPIT
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