PNEUMATIC SEEDING UNIT Russian patent published in 1998 - IPC

FIELD: agricultural engineering. SUBSTANCE: seeding unit has housing, fixed shaft, seed disk mounted on shaft and provided with suction openings, closure and seed chamber, drive gear of seed disk driving mechanism, vacuumizing chamber and atmospheric pressure chamber. Sealing layer is positioned between seed disk and vacuumizing chamber. Seeding unit is further provided with agitator, seed thrower, member for removing seed from seed disk opening, and compression spring arranged between closure and seed disk in axial alignment with them. Ends of spring are positioned perpendicular to shaft. Compression spring provides permanent contact between sealing layer and seed disk, as well as with vacuumizing chamber, to maintain stable-state process pressure in this chamber and, as a result, reliable and precise seeding. Construction of seeding unit allows adjustment and regulation of seeding unit, since sealing layer may be worn out, to be eliminated. EFFECT: increased efficiency by reduced labor intensity and time consumption, simplified operation and maintenance. 3 cl, 1 dwg