型荞麦脱粒机的设计与试验

Abstract

A 5TG-85 buckwheat thresher was designed to solve the problems of low mechanical harvesting level of buckwheat in hilly and mountainous areas, high work intensity of threshing and grain cleaning, and few available machines and tools. The machine adopts rasp bar-nail tooth combined threshing device and air screen cleaning device, which can complete threshing and grain cleaning at one time. In the paper, the structure, transmission system and key components of the thresher were designed, the parameters were calculated, and the threshing performance test was carried out. The results show that when the moisture content of buckwheat stem is 75%, the moisture content of grain is 17%, and the grass grain ratio is 4.4, when the rotating speed of the threshing drum of the thresher is 500r/min, the threshing gap is 10mm, the feeding amount is 0.8kg/s, the air speed of suction mouth is 8m/s, and the vibration frequency of vibrating screen is 25.12 rad·s-1. The crushing rate Zp is 1.13%, the impurity content Zz is 2.73%, the unthreshed loss rate Sw is 0.07%, the entrainment loss rate Sj is 1.77%, the cleaning loss rate Sq is 1.96%, the spatter loss rate Sf is 0.62% and the total loss rate S is 4.42%. The threshing effect is good, which meets the requirements of buckwheat threshing. The development of this machine will reduce the manual cost of buckwheat threshing, improve the work efficiency, improve the mechanized harvest level of buckwheat, and promote the development of buckwheat industry.