| 摘要 |
PURPOSE:To efficiently grind a powder by providing a powder raw material supply port to an acceleration pipe and providing a secondary air introducing port to the acceleration pipe between the powder raw material supply port of the acceleration pipe and the outlet thereof. CONSTITUTION:A powder raw material 7 is supplied to an acceleration pipe 3 from the powder material supply port 1 provided to the acceleration pipe 3 and instantaneously accelerated by the compressed air from a compressed air supply nozzle 2 to reach high speed. The powder raw material emitted to a grinding chamber 8 at high speed from the outlet 13 of the acceleration pipe 3 impinges against the impact surface 14 of a barrier member 4 to be ground. Further, a secondary air introducing port 10 is provided to the acceleration pipe 3 between the powder raw material supply port 1 of the acceleration pipe 3 and the outlet 13 thereof to introduce secondary air into the acceleration pipe 3 and a powder raw material supply hopper 15. By this method, the suction capacity of the powder raw material supply port 1 is enhanced and the powder is efficiently sent in the acceleration pipe 3. By this method, grinding efficiency can be enhanced. |
