基于地轮测速的玉米精量播种机粒距均匀性控制OA

Aiming at the problem of uneven grain spacing in the sowing of corn precision seeder,this paper analyzes the problem from the perspective of sowing principle,it was concluded from the analysis of sowing principle that the uniformity of seed spacing was related to the factors such as the clearance of the seed metering device,the seed transportation in seed guide tube,the precise positioning of the seed landing,the speed control of the seed metering device and the inaccurate detection of the driving speed.Therefore,the clearance of the seed metering device and the speed control of the seed me-tering device were optimized and improved.An automatic adjustment device for seed clearance was designed,so that seeds of different particle sizes could achieve single seeding seed metering.By calculating the sliding distance of the ground wheel,the driving speed detected was corrected when the ground wheel slipped.The soil cleaning device was de-signed to keep the diameter of the ground wheel stable,so that the driving speed detection error was small and the seed uniformity was improved.Seed metering tests were conducted on three seed varieties using the seed-cleaning device both before and after improvements.After the improvement,the missing sowing index was reduced by 0.3,0.5 and 0.8 per-centage points,respectively.The improved device has good adaptability to different seeds and good operation effect.Field experiments were carried out on dry land,wet land and sandy land,respectively.The results showed that the variation co-efficients of plant spacing of the improved seeder were 15.9%,16.8%and 17.3%,which were 1.5,2.5 and 2.6 per-centage points lower than those before improvement,indicating that the sowing uniformity of the improved seeder was im-proved.