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为适应小麦精密播种的要求,对传统气吸式精密排种器进行改进,确定了各部件参数的取值范围。通过二次回归正交试验,分析吸孔直径、吸孔处压力和排种盘转速3个因素对合格率的影响,并建立了合格率的回归方程进行方差分析和拟合度检验。结果表明:影响小麦气吸式排种器合格率的因素依次为:排种盘型孔直径、吸孔处风压和排种盘转速;经回归方程优化得到各因素的最优组合为,吸孔直径2.6 mm、排种盘转速28.3 r/min、吸孔处压力2.28 kPa,此时排种器合格率达到97%,满足小麦精密播种的要求。改进后的小麦精密排种器结构简单,较传统气吸式精密排种器排种性能有较大提高。
In order to meet the requirements of precision wheat sowing, the traditional air suction precision seed metering device is improved, and the range of parameters of each component is determined. By quadratic regression orthogonal experiment, the influence of three factors including suction hole diameter, suction hole pressure and seed plate rotation speed on the pass rate was analyzed, and the regression equation of pass rate was established for variance analysis and fitting degree test. The results showed that the factors influencing the yield of wheat gas-seeded seed metering were as follows: the diameter of the seed disk, the air pressure at the suction hole and the rotation speed of the seed plate; the optimum combination of each factor was obtained by regression equation The diameter of the hole is 2.6 mm, the speed of the seed plate is 28.3 r / min and the pressure at the suction hole is 2.28 kPa. The pass rate of the seed metering device reaches 97% at this time, which meets the requirements of precise wheat sowing. The improved wheat precision seed metering device has a simple structure and greatly improves the seed-discharging performance compared with the traditional air-suction precision seed metering device.