Research on optimal design method of maize seed tube based on DEM
In order to improve the uniformity of sowing by maize concentrate seeder,it is necessary to guide seeds into the seed ditch with reasonable seed tubes,and the optimal design of the seed tube of maize concentrate seeder is studied based on discrete element method.Firstly,based on the zero-speed seeding theory,the kinematic energy conservation equation is used to analyze the main curve of the seed tube,and the horizontal velocity equation of the seed at the outlet of the seed tube is obtained.Then the RSM optimization module design experiment based on Insight software,combined with the horizontal velocity equation of the outlet of the seed tube,the angle α of the circular arc segment,the angle β between the straight segment and the horizontal direction,the height of the straight segment h1,and the radius of the circular arc segment R are selected as factors.At the same time,considering the analysis of the outlet horizontal velocity and the range adjustment of the actual agronomic seed spacing,the angular velocity of the seed discharge disc ω is increased as the factor,and the main curve parameters are optimized and solved in response to the plant spacing variation coefficient and the outlet horizontal velocity.In the range of ω=15-45 r/min parameters,the outlet horizontal speed is less than 0.1 m/s,and the coefficient of variation is less than 5％,and the optimal parameter combination of the main curve of the seed tube is:α=25°,β=11°,h1=200 mm,R=625 mm.According to the best parameters obtained,CATIA software was used to build a three-dimensional model and 3D printing was used for bench test.The coefficient of variation of the seeds obtained from the bench test was 11.58％,the pass index was 98.2％,the missed sowing index was 0.83％,and the reseeding index was 0.97％.The results show that the optimal design of the main curve of the seed guide tube is reasonable.
precision planterseed tubediscrete elementoptimal designcoefficient of variation
万方数据
维普
