脱粒机作业质量差原因分析复式、半复式全喂入脱粒机作业质量不符合要求，大致有如下情况及原因。（１）脱粒不净原因是滚筒与凹板间隙过大、滚筒转速过低、喂入不均匀和谷物潮湿等。这时，先使喂入连续均匀，若仍脱不净，应减小凹板间隙，适当增加滚筒转速，必要时将潮湿... Threshing machine cause poor quality analysis Duplex, semi-duplex full feed threshing machine operating quality does not meet the requirements, roughly the following conditions and reasons. (1) Threshing is not the net reason is the gap between the drum and the concave plate is too large, the drum speed is too low, uneven feeding and grain moisture. At this time, the first continuous feed, if still not clean, should reduce the concave plate gap, an appropriate increase in drum speed, if necessary, wet ...