THEORETICAL BACKGROUND OF INCREASING THE SEPARATING SYSTEM OF A ROOT HARVESTING MACHINE WITH THERMAL ENERGY OF THE EXHAUST GAS SYSTEM

To improve the quality indicators of harvesting root crops in conditions of high humidity, it is proposed to mount a separating device on the combine, which ensures the separation of root crops from soil and plant impurities with simultaneous blowing of their surface with hot exhaust gases from the power plant of the harvesting machine. Heat losses with exhaust gases (Q_G = 51960 J/s) exceed its amount equivalent to useful work (Q_A = 50900 J/s), therefore, it is necessary to ensure efficient use of the heat released into the atmosphere to increase the efficiency of the energy component of harvesting root crops and potatoes in conditions of high soil moisture. The aim of the study is to theoretically substantiate the improvement of the quality of separation of sugar beet root crops in conditions of high humidity with the use of blowing the working surface of the cleaning devices with exhaust gases from the power plant of the self-propelled harvester in the separation system of the harvester. The subject of research is the separation system of a combine harvester, represented by a cleaning star with installed deflectors for blowing the working surface. The condition for the uniform distribution of a heap of commercial products over the separating working surface is determined and theoretical dependences of the angular velocity v_EL and the rotational speed n_SP of the separating star on the forward speed of the sweeper and the radius of the separating star with uniform blowing of exhaust gases on the working surface are obtained