| 摘要 |
<p>PURPOSE:To pulverize powder to specified fine particle diameter and to improve the pulverizing efficiency by introducing the powdery by pressure or suction force from an accelerating pipe for feeding a material to be pulverized, dividing and collecting fine powder by the Coanda effect and pulverzing coarse powder by an impact member. CONSTITUTION:A material to be pulverized dispersed and sucked into an accelerating pipe 3 is completely dispersed by a high speed air current from an air nozzle 10, and carried and accelerated by the high speed air current in the accelerating pipe 3 to form a supersonic speed solid-gas mixed flow. By the Coanda effect, the relatively fine powder flows on the wall side, and the relatively coarse powder flows near the center. By using such a phenomenon, the fine powder and the coarse powder are separated from each other by a classifying edge 6 near the outlet of the accelerating pipe 3. The fine powder is discharged from a fine powder discharge port 7. The coarse powder is subjected to the similar action and hits against an impact member 4 to be finely pulverized. Then, the pulverized material is further pulverized by the secondary impact at the wall of a pulverizing chamber 5. Depending on the circumstances, it is subjected to the tertiary impact and further pulverized until it is conveyed to an outlet part 8.</p> |
