A methodology of kinematic calculation for screw conveyor of stems to adjustment for sunflower harvesting

The process of stems movement is analyzed for determination of optimum geometrical and kinematic parameters of the screw conveyors. The equation of the movement point on the screw line is worked out. An expression for finding of a size of an absolute speed vector is defined. The size of acceleration of a point along a screw axis is mathematically determined. The interrelation between geometrical and kinematic parameters of the screw conveyor is revealed. Length of a stem piece is determined as a ra-dius-vector to a trajectory of a point movement of a stem-screw conveyor, and a stem deviation corner from a vertical is determined as a corner of the directing cosine of radius-vector. Solving the received equation it is possible to define an operating mode and parameters of the screw conveyor.