PNEUMATIC DRILL FOR LEGUMINOUS CROPS Russian patent published in 1998 - IPC

FIELD: agriculture, in particular, precision drilling of seeds and simultaneously application of fertilizer into seed spacing. SUBSTANCE: drill has frame carrying seeding unit with seed guide for each shank, hopper positioned above seeding unit and having seed section and fertilizer section, and hydraulic cylinder kinematically connected with shanks fixed above frame. Pneumatic supporting and drive wheels are arranged at both sides of frame. Seeding unit is made in the from of drum secured to drive shaft and consisting of equal disks interconnected and tightly fitted one relative to another. Contacting edges of disks are provided with calibrated halves of cells forming cells upon joining of disks and defining seeding contour. Opposite edges of disks have cell halves of different size offset one relative to another and arranged in staggered rows. Six vacuum chambers are arranged in radial symmetry and connected via channels to cells of seeding contours and pipelines via seeding unit closures provided with vacuum cavity of 120 deg length. Receiver is positioned in front part of frame and connected with its one side to tractor exhaust system and with its other side to seeding unit closure. Valves positioned in bottoms of seed section and fertilizer section are secured on pins. Gates for retaining valves in open position are positioned above pins. Seeding unit drive wheels are mounted behind frame and connected with seeding unit through chain transmission. Two independent seeding units with two hoppers may be mounted on drill shaft to provide uniform operation during turning of tractor pulling drill. EFFECT: increased efficiency by precise seed and fertilizer drilling without mixing them, reduced injure to seeds and improved germination of seeds. 2 cl, 5 dwg