INFLUENCE OF DESIGN CHANGES IN PNEUMATIC SEEDING DEVICES ON THE QUALITY INDICATORS OF SEEDING
Designs of pneumatic seeding devices operating on an overpressure air flow have been developed. The first one is designed for seeding seeds of two row crops in a compacted way. The diffusion system developed by the pneumatic device produced constructive changes, the sowing discs are fixed between them for sowing seeds of two cultures at the same time with the possibility of displacement of one disk relative to another circumferentially and dismantling, and the air nozzle is divided into two pairs of nozzles with the same cross-sections, the first removes excess seeds from the cells, keeping one, and another pair for ejection of cells stuck seeds without compromising their integrity with adherence to established planting schemes. The second development is intended for seeding seeds by dotted and nest methods of seeds with different physical, mechanical and aerodynamic properties by changing the dosing system, in which, thanks to the use of bushings with holes on the thread located at the bottom of conical cells, it became possible to switch from single-grain seeding to nest seeding, without changing the seeding disks, it is enough to change the bushings of cells with two or three holes on them. The use of developed designs of pneumatic seeding devices allows improving operational reliability and increasing the yield of the sown crop by up to 15%.