倾斜圆台型玉米精密排种器种子破损试验

针对机械式精密排种器伤种率高的问题,提出了一种基于丸粒化玉米种子的精密排种器.以排种轴转速、型孔直径、动盘锥角为因素,种子破损率为指标,运用二次回归正交旋转安排试验,建立了种子破损率与各影响因素之间的回归数学模型.通过Design-Expert 7.1软件对试验参数进行优化,确定排种轴转速13.2 r/min、型孔直径16 mm、动盘锥角26.5°为最佳参数组合,此时种子破损率为0.65％.验证试验表明该组合下试验误差较小.

Corn Seed Damaging Experiment in Truncated Cone Precision Metering

Based on the problem of high seed damaging, a precision metering was proposed based on the pelleted corn seeds.The two times orthogonal rotational regressive tests were designed in the experiments. The rotary speed, diameter of the cell, cone angle of the metering seeding plate were defined as input parameters and seed damaging index was defined as output parameters. The regression mathematics models between output parameters and input parameters were established and then parameters were optimized through Design-Expert 7.1. The optimal combination was that the rotary speed of 13.2 r/min, diameter of the cell of 16 mm, cone angle of the metering seeding plate of 26.5°, at that time the seed damaging index of 0.65%. Confirmatory tests showed that the inaccuracy was little.