DESIGN AND THRESHING OUTPUTS STUDY OF INTERNAL AND EXTERNAL ROTARY ROLLER BUCKWHEAT THRESHER

In order to study the distribution of buckwheat threshing outputs, on the self-designed internal and external rotary roller buckwheat threshing device test bench, the feeding amount was 0.5 kg/s, the internal roller speed was 380 r/min, and the external roller speed was +50 r/min (same direction as the internal roller), 0 r/min and -50 r/min (reverse direction compared to the internal roller) for threshing test. By analysing the overall condition of the threshing outputs, the content of each component in the threshing outputs, and the axial distribution of the threshing roller, it was found that the receiving box below the rasp bar roller mainly contained grains and chaff, leaves and petals, and the receiving box below the spike tooth roller mainly contained short stalks. Under the three conditions, the proportion of chaff in the threshing outputs was 40-45%, the proportion of leaves and petals was 23-29%, the proportion of grains was 13-19%, the proportion of short stalks was 14-16%. Grains, chaff, leaves and petals were mainly concentrated at the front, and short stalks were mainly distributed at the rear of the threshing roller, providing a theoretical basis for the design of the cleaning system.