Abstract
Planting performance is essential for wheat seeders and reliable seed germination. The seed-filling effect is also important in the sowing performance. In this study, a self-suction wheat shooting device was developed to improve the seed-filling performance. In specific, the shooting device structure was optimized, in which negative pressure was generated in the inner cavity of the device. A DEM-CFD coupling simulation experiment was conducted to investigate the seed-filling and shooting performance. The effect of three working parameters (rotational speed of shooting device, window length and window width of directional seed delivery wheel) on the coefficient of variation of the seed-filling performance (CVSF), average shooting speed (ASS), average shooting depth (ASD) and drag force (DF) were analyzed. Afterward, a validation experiment was conducted to investigate the shooting performance of the self-suction shooting device. The results showed that the shooting performance of the self-suction device under optimized operation parameters could fully meet the shooting requirements of winter wheat in the North China plain. In specific, the coefficient of variation of the seed amount (CVSA), ASD and ASS of self-suction shooting device were 7.1%, 30.9 mm and 33.5 m/s at the rotational speed, window length and window width were 1200 rpm, 35 mm and 60 mm, respectively.
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