Abstract: Classify-impact mill is widely used in ultrafine grinding industry. However，current research on the process of classify-impact mill is insufficient. In order to get suitable process parameters for classify-impact mill，the cutted corn stover was used as raw material in this study. The corn stover was firstly crushed by hammer crusher with screen mesh at 4mm，then crushed by classify-impact mill. The effects of secondary air，the number of beaters，circumferential speed of beaters for yield and energy consumption per unit were discussed. The results showed that yield was improved by 43.6 percent in the present of the secondary air. The energy consumption per unit was lower than 4 beaters or 16 beaters when 8 beaters were used in the classify-impact mill，but the improvement was not significant. The yield higher was at circumferential speed of 130m/s.

Key words: classify-impact mill, corn stover powder, process parameters

摘要： 分级式冲击磨是应用十分广泛的超细粉碎设备，但目前对分级式冲击磨的一些工艺参数的研究还不够充分。为了得到科学、合理的分级式冲击磨的工艺参数，本实验选用切断的玉米秸秆作为实验原料，用锤片式破碎机对其进行破碎并过筛（筛网孔径4mm），通过分级式冲击磨对粗破过筛后的玉米秸秆进行粉碎。实验考察了二次风风门开闭情况、锤头数量、锤头周向速度对玉米秸秆粉体产量及设备单位能耗的影响。实验结果表明，二次风风门全开时，粉体产量比二次风风门关闭时提高43.6%；锤头数量为8个时，粉体产量比锤头数量为4个和16个时高，单位能耗比锤头数量为4个和16个时低，但差距并不明显；锤头周向速度为130m/s时，粉体的产量比锤头周向速度为120m/s、110m/s、100m/s时高。

关键词: 分级式冲击磨, 秸秆粉体, 工艺参数