Authors

Abstract

Aiming at the problem of traditional external grooved wheel type fertilizer discharger, which discharges fertilizer unevenly, an internal tangent circle external grooved wheel type granular fertilizer discharger is designed. Firstly, the 19-19-19 NPK compound fertilizer produced by Stanley Company in China is selected, and the pulsatility of the straight groove wheel, external tangent circle groove wheel, and internal tangent circle groove wheel is compared and analyzed using the Hertz-Mindlin (no-slip) model in the EDM2020 simulation, then the structural parameters are optimized for the better type of groove wheel. Finally, the Field Oriented Control (FOC) algorithm is used to control the brushless motor to further optimize the coefficient of uniform volatility. The four factors and three levels response surface simulation test was conducted with the groove tooth inclination angle, number of grooves, diameter of the inner tangent circle and angular velocity of groove wheel as test factors. Simulation results showed that when the groove tooth inclination angle was 38.341°, the number of grooves was 9.999, the diameter of the inner tangent circle was 13.154 mm, and the angular velocity of groove wheel was 5.998 rad/s, the coefficient of uniformity of fluctuation of the discharged fertilizer was 4.11%. Based on practical considerations, the groove tooth inclination angle was set to 38°, the number of grooves to 10, the diameter of the inner tangent circle to 13 mm, and the groove wheel angular velocity to 6 rad/s for a bench validation test. The bench test results showed that the optimized internal tangent circle groove wheel fertilizer applicator achieved a uniform fluctuation coefficient of 6.32%, while incorporating FOC algorithm motor control further reduced the coefficient to 4.62%, meeting the design requirements for the fertilizer applicator.

Abstract in Chinese

针对传统外槽轮式排肥器排肥不均匀的问题，设计了一种内切圆外槽轮式颗粒肥料排肥器。首先，通过仿真对比分析直槽轮、外切圆槽轮和内切圆槽轮的脉动性，然后针对较优型槽轮进行结构参数优化设计，最后利用FOC算法控制无刷电机进一步优化排肥均匀波动性系数。以槽轮槽齿倾角、槽轮槽数、内切圆直径和槽轮角速度为试验因素，进行四因素三水平响应面仿真试验。仿真试验结果表明：当内切圆槽轮槽齿倾角为38.341°、槽轮数目为9.999、内切圆直径为13.154mm、槽轮角速度为5.998rad/s时，排肥均匀波动性系数较优值为4.11%。根据实际情况取倾角为38°、槽轮槽数为10、内切圆直径为13mm、槽轮角速度为6rad/s进行台架验证试验。台架验证试验结果表明:优化后的内切圆槽轮排肥器，排肥均匀波动性系数为6.32%，而增加FOC算法电机控制后的排肥均匀波动性系数为4.62%，符合排肥器设计要求。