SEEDING UNIT Russian patent published in 2001 - IPC

FIELD: agricultural engineering. SUBSTANCE: seeding unit has hopper, branch pipe positioned on hopper lower end and equipped with seeding window, seeding disk arranged at lower level of seeding window, and curved scraper adapted for engagement with seeding disk. Shield with central round window is fixed along the entire perimeter of branch pipe, at upper level of seeding window. Cone with rectangular blades on its generatrices is axially located on seeding disk. Blades are inclined to radial planes. Lower ends of blades are positioned on seeding disk and upper ends at the level of shield. Inclination angle of cone generatrix with respect to seeding disk is larger than angle of repose of seed material. Radial projection on branch pipe internal surface is formed by concave surface joined with its end to branch pipe wall. Radial length of projection is equal to half the height of branch pipe divided by tangent of seed angle of repose. At projection apex, concave surface is aligned with end of scraper concave surface to form continuous curved surface. Scraper is connected to branch pipe so that it may be repositioned along radial straight line drawn through projection apex. Convex surface intersects seeding window. Scraper is repositioned along radial straight line to change rectangular section of seed flow. Seeding unit may be used in drills. EFFECT: increased efficiency, improved uniformity of seed sowing and wider range of doses. 2 cl, 3 dwg