通过对国内外现有超细粉分级机文献的调研分析，参考国外ACUCUT干式分极机，设计了一套逆流式离心分级系统．在超细粉分级研究工作中，引入一个简化了的物理模拟模型．该模型假设颗粒在离心力场的任向具有一个二力平衡状态，即颗粒的运动状主要决定了空气曳力及离心力的作用情? Through the research and analysis of the literature about the existing ultrafine powder classifier both at home and abroad, a countercurrent centrifugal classification system is designed with reference to the ACUCUT dry polar machine abroad. In the study of the classification of ultrafine powder, a simplified physical simulation model is introduced. The model assumes that the particles in the centrifugal force field has a two-state balance, that is, the movement of particles mainly determines the action of air drag and centrifugal force.