PNEUMATIC SEEDING UNIT Russian patent published in 2004 - IPC

FIELD: agricultural engineering, in particular, precise drill equipment.

SUBSTANCE: seeding unit has rotating seeding disk with suction holes, layer, vacuumizer, and plated excessive seed ejector. Disk is equipped with auxiliary holes having diameter smaller than or equal to that of suction holes. Auxiliary holes are arranged at smaller radius concentrically to circle defined by suction holes, said radius satisfying condition: is radius of arrangement of auxiliary holes; is radius of arrangement of suction holes; is diameter of auxiliary holes; is diameter of suction holes. With suction holes pitch smaller than three conventional geometric mean diameters of seed, auxiliary holes are arranged in offset relation with respect to suction holes, said offset angle being deg, where t is suction holes pitch. Auxiliary holes and suction holes are equal in number. With suction holes pitch exceeding three geometric mean diameters of seeds, auxiliary holes are arranged in offset relation with respect to suction holes, said offset angle being conventional geometric mean of seed diameter. In this case, number of auxiliary holes exceeds that of suction holes by twice. Layer has horseshoe-shaped cut having outer radius R satisfying double inequality: radius of seeding disk, and inner radius is within the range of Cut is widened toward point of intersection of layer surface and axis of rotation of seeding disk by value determined from condition:

EFFECT: improved quality of single feeding of seeds.

5 dwg