Optimizing mash threshing quality through drum rotation frequency adjustment

The Case-2366 and Dominator-130 grain harvesters are mainly used in Uzbekistan to thresh the mung bean crop. The use of the Dominator-130 grain harvester shows that although the combine has low fuel consumption and crushes less straw, however, when the combine is working to thresh mung, the grain crushing exceeds the permissible norms (2%) and this in turn limits the wide use of the combine in harvesting mung. Taking this into account, the paper studies the effect of the rotation frequency of the threshing drum on the quality of threshing the grain mass of mung. The conducted studies show that for threshing mung bean grain the most suitable is a threshing drum with pin working elements, which at a rotation frequency of the threshing drum of 300 r/min provides under-threshing of grain from chips of 0.8%, and grain crushing of 0.6%, which corresponds to the requirements for grain separation through a deck of 73.4%.