ROTARY HARROW Russian patent published in 2011 - IPC A01B29/04 A01B21/04 

FIELD: agriculture.

SUBSTANCE: harrow comprises a frame and hollow drums installed on it with the possibility of rotation. Each drum is arranged in the form of a spring with teeth on its turns, and direction of winding of the subsequent spring is opposite to the winding direction of the previous one. The teeth on spring turns are arranged as detachable. The frame is made with the possibility to vary width of the rotary harrow grip by a value equal to where b - value of increment of the rotary harrow grip width, m; B - width of the rotary harrow grip, m; D_clod - diameter of an average clod, m; a - spring pitch, m; d - value of the spring diameter increment, m; φ₁ - angle of soil friction against metal; φ₂ - angle of soil friction against soil; K_w - coefficient, which takes into account the soil moisture prior to processing K_w=1.1…1.4, at the same time drums are installed on the frame with the possibility of rotation with their various angular speeds, besides, the speed of rotation of the subsequent drum is more than the speed of the previous one.

EFFECT: design will make it possible to reduce power inputs with simultaneous improvement of soil treatment quality.

4 cl, 6 dwg