西北旱区大豆玉米复合种植联合播种机的设计与试验OA北大核心CSTPCD

In response to the shortage of soybean and corn compound planting equipment and low mechanization level in the Northwest arid area,a soybean and corn compound planting combined seeder was designed.This machine is composed of one rotary tillage device,one ridging device,one soil covering device,one fertilization device,one frame,and one seeding device.It can achieve multiple operational processes such as rotary tillage,ridging,fertilization,double film mulching,compaction,and seeding.The key components of the seeder are designed and analyzed,the soil covering process using a discrete element model is simulated,and the uniformity of the soil covering on the membrane edge during the soil covering process is analyzed;The sowing performance of soybean and corn sowing devices was simulated using DEM-MBD coupling,and the uniformity of sowing of soybean and corn sowing devices are analyzed.The simulation results show that:1)The number of soil particles falling onto the ridge surface due to jumping and scattering is≤1.3％;2)The seeding device exerts a squeezing force of ≤10 N on soybean and corn seeds,and the resistance of soil particles to duckbill is ≤ 50 N.The field test results showed that the qualified rate,missed rate,and replant rate of the corn sowing device were 95.63％,1.65％,and 2.72％,respectively,while the qualified rate,missed rate,and replant rate of the soybean sowing device were 91.24％,0％,and 8.76％,respectively.In conclusion,the unit operates stably during the operation period and has good operational effects,which meet the requirements of soybean corn strip composite sowing.