Authors

Abstract

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

针对传统外槽轮排肥器的脉动性问题，设计了一种对置双螺旋外槽轮排肥器，进行了对置双螺旋槽轮参数设计分析，为获取排肥效果最佳的槽轮参数，本文以对置双螺旋外槽轮排肥器为研究对象，运用离散元仿真和台架试验相结合的方式，在确定槽轮直径为60mm，凹槽数目为7，凹槽截面为圆弧状的基础上，通过离散元仿真分析了肥料颗粒在对置双螺旋外槽轮排肥器中的运动过程，开展了对置双螺旋槽轮转速、凹槽截面半径、槽轮工作长度和槽轮螺旋升角对排肥均匀度变异系数的影响仿真正交试验，试验结果表明，影响排肥均匀度的因素主次为：槽轮工作长度>槽轮转速>槽轮螺旋升角>槽轮凹槽半径，排肥效果最优的结构参数组合为：槽轮转速30r/min，凹槽半径10mm，槽轮工作长度50mm，槽轮螺旋升角45°，该参数组合下排肥均匀度变异系数为3.08%。应用3D打印技术制造最优参数组合下的对置双螺旋外槽轮排肥器，通过台架试验来验证其实际排肥性能，结果表明，该参数组合下的排肥均匀度变异系数为3.99%，与仿真试验偏差为0.91%，进一步验证了离散元仿真研究对置双螺旋外槽轮排肥器排肥性能的可靠性。