The claimed utility model relates to agricultural machinery, particularly to a disc implements intended for the surface treatment of soil. The technical result - reduction of energy consumption for tillage and improving the quality of three-row disk harrow.; The technical result is achieved in that the three-row disc harrow, comprising a frame with crossbeams, by means of which individual struts in three rows, spherical wheels arranged established working surface at an acute angle of attack to the direction of movement, wherein the first row are installed on left- and pravooborachivayuschie disc working elements arranged relative to the longitudinal axis of the mirror, vrazval and concave discs of the third row of the opposed concave discs of the second row, and the closest to the longitudinal hydrochloric axis wheels of the second and third rows directed concavities towards that axis, according to the utility model wheels in each row are set the working surface at an angle of attack to increase from the first to the third row, namely: α 1 α 2 α 3, the harrow comprising a device adjusting the angle of attack of disk, with a smooth incremental increase in the angle of attack. In this step adjusting the angle of attack is equal to two degrees. Discs of the first row are installed working surface at an angle of attack α 1 = 10-12 ° to the direction of motion, the second row of wheels mounted working surface at an angle of attack α 2 14-16 ° to the direction of movement, the third row of wheels mounted working surface at an angle of attack α 3 16-18 ° to the direction of movement.; The apparatus adjust the angle of attack of disks mounted on each row of disks, and comprises an adjusting bar, connected with the adjusting unit, and a scale mounted on the bracket frame harrow. The adjusting assembly comprises two rod multidirectional threaded sleeve connected with two threaded holes for the first and second rod, respectively, with the possibility of sliding to the clutch center or moving apart rods. 1 bp ZP 4 2 Fig.
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