一、脱粒不净原因:喂入量过大或喂入不均匀;纹杆与凹板之间有脱粒间隙过大;滚筒转速过低;谷物太潮湿。调修方法:1、减少喂入量,均匀喂入。2、正确调整好脱粒间隙,磨损严重的零件应及时更换。3、动力机的皮带轮与脱粒机的皮带轮配合要合理,如皮带轮打滑丢转,应调整张紧轮,把皮带张紧。4、秸秆过湿的谷物要适当通风、晾晒后再脱粒。二、籽粒清洁度差原因:风机风量不 First, threshing is not a net reason: the amount of feed is too large or uneven feeding; between the rod and concave plate threshing gap is too large; drum speed is too low; the grain is too wet. Adjustment methods: 1, reduce the amount of feeding, uniform feeding. 2, properly adjust the threshing gap, serious wear and tear parts should be promptly replaced. 3, the power of the pulley pulley and thresher with the pulley to be reasonable, such as pulley slip slip, you should adjust the tensioner, the belt tensioner. 4, straw wet the cereal to be properly ventilated, drying and threshing. Second, the reasons for poor grain cleanliness: Fan air volume is not