THE INFLUENCE OF THE DIAMETER OF THE SEED DUCT ON SEEDING RATES

To ensure a high performance indicator of the seeders, it is necessary to pay due attention to each element of the equipment used. In order to assess the effect of the diameter of the seed duct on the uniformity of its flight time by corn seeds, laboratory experimental studies were conducted in which corn seeds were passed through nozzles with diameters of 14, 20, 27, and 38 mm. In addition, during the experiment, the frequency of seed entry into the seed duct was changed in the range from 6.5 pcs/s to 23.7 pcs/s and the change in the coefficient of variation of intervals and seeding quality were evaluated. It was found that with an increase in the diameter of the seed duct from 14 to 38 mm, there is a deterioration in the uniformity of its flight time by corn seeds of various fractions. An increase in the air flow velocity helps to improve the uniformity of the flight time of the seed ducts. With a seed input frequency of 6.5 pcs/s, their inversion inside the seed duct is practically absent, the coefficient of variation of seed ejection intervals increases with increasing diameter of the seed duct. An increase in the frequency of seed entry into the seed duct to 23.7 pcs / s leads to a sharp violation of the quality of seed supply by the seed duct with a diameter of 14 mm, up to the absence of inversion of seeds inside. The quality of the seeding machine when using a seed pipe with a diameter of 20 mm is not impaired. The seed line ensures a uniform supply of seeds and ensures a set seeding rate. The uniformity of seeding in this seed duct is higher than in large-diameter seed ducts, and the air consumption is lower. These indicators give reason to recommend seed lines with a diameter of 20 mm for use in pneumatic seed drills for sowing corn.