DETERMING OPERATING MODES OF AXIAL-ROTARY COMBINE HARVESTERS FOR HARVESTING MIXED CROPS

Abstract

The authors have conducted a study to determine a set of operating modes of axial-rotary combine harvesters for mixed harvesting of cereal grain and leguminous crops. The paper outlines a technological process of axial-rotary combine harvesters, lists their technical characteristics and features of operation. A mathematical model has been compiled to determine the operating modes of axial-rotary threshing and separating systems for harvesting mixed crops and transfer coefficients have been specified. The first coefficient describes complete threshing of eared grains, and the second one reflects the minimal damage to the leguminous component. The aggregation function is presented in the form of the relationship between indicators of the same level. The authors have evaluated quality indicators of harvesting mixed crops with axial-rotary combine harvesters. The paper presents dependences of macro- and microdamages of of cereal and legume grains in mixed crops after harvesting with axial-rotary combines. The operation modes of the combine harvester РСМ-181 "TORUM" for harvesting mixed crops of white lupine and triticale have been substantiated. As a result, a gap between the rotor and the deck of 35 mm and a rotor speed of 400...450 min^-1 are recommended.