| 摘要 |
A unit for precision sowing comprises a body with a cell vertical disk, arranged inside, an impeller with an independent drive and also a combined runner-type opener. Between cheeks of the runner-type opener under a point of coming out seeds from the disk cells a guiding plate is mounted. Said guiding plate has a concavity of the radius R directed upwards and a shape described by the brachistochrone equation: x = c(2t - sin2t), y = 0.5c(1 - cos2t), where x, y - orthogonal coordinates; c = y(1 + y'); y' – first derivative; t = arctgy'. The width of the concave plate is selected on the condition that a mounting fit with the cheeks of the runner-type opener is provided, and rear end thereof lies at the same transversal line with a rear end of the cheeks of the opener. The value of the radius R is selected on the basis of the condition:, whereis the concavity value, c– thickness (minimum size) of grain. |
