玉米精播高速投种装置设计与试验OA

Aiming at the problem of increased collision and bouncing probability of seeds during falling under high-speed working conditions,which leads to the deterioration of seeding spacing uniformity and poor seeding quality,a high-speed seed delivery device for precision corn seeding was designed.In this device,an active seed constraint method was adopted to replace the traditional passive guiding method,and active constraints were applied to seeds throughout the entire delivery process,so that the seeds were stabilized within the seed guide belt during falling,thereby improving the seed spacing uniformity.Through theoretical calculation and analysis,the structure and key parameters of the seed delivery device were determined.With the aid of EDEM discrete element simulation software,the optimal combination of performance parameters for the seed-catching structure was obtained:the wheel center distance was 37.44 mm,the rotational speed of the finger wheel was 523.37 r/min,and the finger length was 10.69 mm.Under this parameter combination,a seed catching qualification rate of 95.46％was achieved.To verify the optimized design results,static bench tests of the high-speed seed delivery device were carried out,and the performance under different operating speeds was evaluated.The results showed that when the operating speed exceeded 14 km/h,the coefficient of variation of seed spacing gradually increased;when the operating speed reached 18 km/h,the coefficient of variation of seed spacing exceeded 20％.The high-speed seed delivery device significantly improved the seed spacing uniformity during the falling stage.