我国粮食清选、分级机械现状及发展玄义梅，宋新庆（黑龙江省农垦科学院）宋士江（黑龙江省白桦清选机械厂）我国对粮食清选机械的研究、生产早在５０年代就开始了，最早的产品是手动风车、溜筛，生产率低、清选效果不佳；６０年代的产品是电动扬场机，虽提高了生产效率，... China’s grain clearance, grading machinery status and development Xuanyi Mei, Song Xinqing (Heilongjiang Provincial Academy of Agricultural Sciences) Song Shijiang (Heilongjiang Province Birch Qingxuan Machinery Factory) China’s grain clearance machinery research, production as early as the 50s began, the earliest The product is a manual windmill, slip screen, low productivity, poor cleaning effect; 60’s products are electric Yang machine, although increased production efficiency, ...