FIELD: agricultural engineering. SUBSTANCE: threshing unit has drum and concave. Drum has shaft, disks, and beater holders. Grooved and smooth surface beaters are arranged in alternation on beater holders. Concave has two sides and two end plates. Perforated planks are fixed in sides and rods are passed through perforations. Ends of planks arranged under rods are bent in direction of rotation of drum. Diameter of drum portions, to which smooth surface beaters are fixed, is greater than diameter of drum portion, to which grooved beaters are fixed. EFFECT: reduced damage to grains and increased strength of concave. 2 dwg
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