套作模式下链环式覆土器的参数优化

针对在西南丘陵地区使用小麦免耕直播机播种时的覆土要求,采用中心组合试验设计方法进行链环式覆土器的机播试验,建立了覆土合格率与外径、链环厚度、链环宽度的数学模型,并采用响应面优化分析,得到了链环式覆土器的最佳结构参数.结果证明:当外径为150 mm、链环厚度为9mm、链环宽度为16mm的较优参数组合时,覆土合格率达98.07％.实践证明该优化方案可行,为西南地区小麦直播机的改进设计提供了理论依据.

Parameter optimization of interlink covering device in relay-cropping system

In view of the soil covering demand when wheat no-tillage seeder seed wheat in the hilly area of southwest, the experiment about wheat seeding of interlink covering device was carried out with central composite experiment design. Meanwhile, the mathematical model between covering acceptability and external diameter, serial thickness, serial width was established. The optimal structure parameters of interlink covering device were obtained by response surface analysis. The results indicated that the covering acceptability reached 98.07% when the external diameter was 150 mm, and the serial thickness and width were 9 and 16mm respectively. The practice shows that the optimization scheme is feasible and provides a theoretical basis for the improved design of wheat no-tillage seeder in the southwest region.