单元四株不等距气吸式玉米排种器的设计与试验OA

Based on the high-efficiency corn planting technology model of'big ridge double row and unit four plants unequal spacing' developed by Jilin Qiushuo Agricultural Co.,Ltd.,this paper designs an air-suction built-in wheeled corn seed-metering device matching the unit four plants unequal spacing planting mode.The structure and working principle of the seed metering device were expounded,and the key components and main structural parameters of the seed metering device were determined,including the diameter of the suction hole of the metering wheel,the number of suction holes,the stirring device and the cleaning device.According to the calculation results,the test bench was built and the experimental research was carried out to determine the optimal working parameters of the seed metering device.The qualified rate,multiple seeding rate and missed seeding rate of corn seeds were used as indicators,and the vacuum degree,operation speed and suction hole diameter were used as experimental factors.The optimization analysis was carried out,and the test results were optimized by Design-Expert software.The results showed that when the vacuum degree was 3.6 kPa,the working speed was 5 km·h-1,and the suction hole diameter was 4.2 mm,the average qualified rate of the equipment was greater than 92％,the average multiple seeding rate was less than 5％,and the average missed sowing rate was less than 3％.The optimization was reasonable and met the agronomic requirements of corn sowing.