Experimental Study on Cleaning of Highland Barley Threshing Materials

Mechanical harvest of highland barley had problems of high loss rate and impurity content.In order to improve cleaning quality of mechanical harvest of highland barley，physical properties and suspension characteristics of each component of threshing materials of highland barley were tested and analyzed.Suspension velocity of grain，awn，glume，broken ear，short stem and broken leaf in threshing material of highland barley was measured by air blowing agricultural material cleaning suspension velocity measuring device，which were 7.07-12.51，1.29-4.08，2.23-6.32，1.82-8.16，1.29-3.65 m/s，respectively.Single factor and orthogonal tests were carried out with wind speed of centrifugal fan，angle of fan，frequency of vibrating screen and amplitude of vibrating screen as test factors.Results showed that when the best combination of test factors was wind speed 8.5 m/s，wind direction 35°，vibrating screen amplitude 30 mm and frequency 190 r/min，cleaning rate was 97.32% and loss rate was 3.73%.This test could provide reference for design of structural parameters and working parameters of cleaning device of highland barley combine harvester.