DISCRETE ELEMENT SIMULATION AND EXPERIMENT OF OPPOSED DOUBLE HELIX OUTER SHEAVE FERTILIZER DISCHARGER

Aiming at the pulsation problem of traditional external grooved wheel fertilizer distributor, an opposed double spiral external grooved wheel fertilizer distributor is designed, and the design and analysis of opposed double spiral grooved wheel parameters are carried out. In order to obtain the parameters of the grooved wheel with the best fertilizer discharge effect, the movement process of fertilizer particles in the opposite double spiral external grooved wheel fertilizer distributor was analyzed through discrete element simulation. Using the combination of discrete element simulation and bench test, a simulation orthogonal experiment was carried out on the influence of the rotational speed of the opposed double spiral sheave, the radius of the groove section, the working length of the sheave and the spiral angle of the sheave on the variation coefficient of fertilizer discharge uniformity. The result shows that the factors affecting the uniformity of fertilizer discharge are: trough wheel working length > trough wheel rotational speed > trough wheel helix angle > trough wheel groove radius, and the groove wheel working length of 50 mm, trough wheel rotational speed of 30 r/min, trough wheel spiral lift angle of 45 degrees and groove radius of 10 mm are the optimal combination of structural parameters for fertilizer discharge effect, and the coefficient of variation of uniformity of fertilizer discharge under this combination of parameters is 3.08%. The actual fertilizer discharge performance was verified by bench test. The results show that the variation coefficient of fertilizer discharge uniformity under the parameter combination is 3.99%, and the deviation from the simulation test is 0.91%. The reliability of the discrete element simulation of the fertilizer discharge performance of the opposed double spiral external grooved wheel fertilizer discharger is verified.