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本文从理论上分析颗粒在分级机内运动分布，将分级空间划分为“分极内区”和“分级外区”，给出分级机细料得率定义，并指出影响分级得率的主要因素，着重提出在不影响细粒粒径的前提下，在分级机底部引入二次空气，并利用实验证实，当二次空气量补引入后，分级机分级得率可增大到７０％以上．
In this paper, the particle distribution in the grader is theoretically analyzed. The grading space is divided into “polar inner zone” and “outer zone”, and the definition of the grading rate of the grading machine is given. The main factors affecting the classification yield are pointed out , Puts forward emphatically that the secondary air is introduced into the bottom of the classifier without affecting the fine particle size, and the experiments prove that when the secondary air volume is introduced, the classification rate of the classifier can be increased to more than 70%.