关键词: 水稻, 育种, 自净, 脱粒装置, 气力式

Abstract: In order to solve the problem of high residue in conventional small-scale combine harvester threshing device, this study choosed  Nong-guang 4LZ-0.8 small combine harvester threshing device to carry out improvement, and adopted the combined way of entire process of air-assisted cleaning and winnower clean up to solve high residual defects caused by original screw feeder and scraper transport. The threshing test bed was designed and tested, taking feed quantity, guide duct inlet wind speed, winnower speed as testing elements, and grain residue in threshing device as performance evaluation index. The single element test for maximum feed rate under different wind speeds was firstly conducted to confirm the scope of test elements, and then to establish the residual mathematical model of threshing device by regression analysis method, and to optimize the best combination of parameters. The results showed that when the feed rate was 0.6 kg/s, wind speed of the duct was 12 m/s, and the speed of winnower was 1 000 r/min, the total residual amount inside the device was 0.18 g.

Key words: rice, breeding, self-purification, threshing device, pneumatic type