DISCRETE ELEMENT SIMULATION AND EXPERIMENT OF OPPOSED DOUBLE HELIX OUTER SHEAVE FERTILIZER DISCHARGER
In view of the pulsation of the traditional external grooved wheel fertilizer ejector, an opposed double spiral external grooved wheel fertilizer ejector is designed, and the parameters of the opposed double spiral grooved wheel are designed and analyzed. In order to obtain the groove wheel parameters with the best fertilizer discharge effect, this paper takes the opposed double spiral outer groove wheel fertilizer discharge device as the research object, using a combined approach of discrete element simulation and bench testing, and determining that the groove wheel diameter is 60mm, the number of grooves is 7, and the groove section is circular arc. On this basis, the movement process of fertilizer particles in the opposed double helix outer sheave fertilizer discharger was analyzed by discrete element simulation. The simulation orthogonal experiment of the effects of the rotating speed of the opposed double spiral sheave, trough wheel groove radius, trough wheel working length and the trough wheel helix angle on the variation coefficient of fertilizer discharge uniformity was carried out. 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 trough wheel working length of 50 mm, trough wheel rotational speed of 30 r/min, trough wheel helix angle of 45° and trough wheel 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 opposed double helix external grooved wheel fertilizer ejector with the optimal parameter combination is manufactured by 3D printing technology, and its actual fertilizer discharge performance is 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%. It further verifies the reliability of discrete element simulation on the fertilizer discharge performance of opposed double helix external grooved wheel fertilizer ejector.
Abstract in Chinese