Machinery & Energetics

The article is timed to the study of pneumatic unit of central-type seeding disk type with tilted axis of rotation, of which cells for seeding are placed concentrically on bottom of disk. At the same time, the value of force of suction of seed to cell in extreme points lying on horizontal diameter of disk during its circular motion in plane inclined at angle to horizon from lower position to upper and vice versa, has different meanings.In article fragment of disk with collapsible and placed in it seed is resulted. In this case, the center of cell and seed coincide and lie on straight line which extends along the bottom surface of disk. Through the joint center of seed and cell, the XYZ coordinate system was performed and direction of forces was shown. In order to simplify the construction of circuit, the X axis is directed perpendicular to drawing plane. From the scheme it is clear from diagram that during the rotation of seed element the pressure on rear pushing wall of cabinet is sharply increased, under the action of which there is equal to magnitude but opposite directed normal force N. This force for semispherical cage is directed at angle α to perpendicular lowered to chord that pulls the finite Clutter points. Since the rear end of seed is constantly pressed against the wall of cell, while the front can be unloaded, in this case there is not stable position and front end of seed will break away from cell. As result, under pressure from other seeds, it can completely tear off and push itself out of closet. In this case, the force weight G, acting down along the Z axis, also tries to tear it off the collar. This is one of reasons that leads to seeding the seed with pass. To prevent this from happening in pneumatic seeding machines, the seeds are kept in cells due to suction force. To determine the value of force of suction of seed to cell, moving from lower position to upper, in article scheme of forces acting on seed at that moment is considered and condition of equilibrium of these forces is drawn up. On basis of this scheme, an analytical dependence of seed suction force on seed cell with tilted axis of rotation is obtained, as from structural and technological parameters (γ, α, R, ω, h) of seed element, and physical and mechanical properties (m, r, l, f, ε, ρ) of seed itself. The obtained dependence makes it possible to determine the values of suction force of seeds to cells intended for servicing right hand side of the drill bit.

seed element, inclined axis, cell, seed, grain layer, pressure, lateral pressure, force, frontal resistance, friction, suction