EXPERIMENT AND PARAMETERS OPTIMIZATION OF SEED DISTRIBUTOR OF MECHANICAL WHEAT SHOOTING SEED-METERING DEVICE

In order to solve problems of lower seed-filling stability and wheat seed damage of mechanical shooting seed-metering device, the filling structure of the shooting device was optimized. The effects of seed movement were obtained through analysing the kinematics and dynamics of wheat seed through seed distributor. The influence factors were the inner diameter of seed distributor, the rotational speed of seed distributor and the inclination angle of distributor window. The discrete element software (DEM) was used to simulate the motion process to explore the different factors on the wheat seeds' movement characteristics in the shooting device. The coefficient of variation of shooting uniformity and shooting speed of wheat seed were selected as test indicators. A verification experiment was conducted, and a high-speed camera was taken to obtain wheat seed's movement and shooting speed. The verification test showed that the constant uniform variation coefficient of seed amount and average shooting depth was 8.6% and 32 mm, respectively.