加压条件下气力轮式精密排种器性能分析

Analysis on Performance of an Air-blowing Vertical-rotor Type Precision Seed-metering Device

针对研制的气力轮式精密排种器,采用均匀设计法设计试验,运用均匀设计软件UST 1.0建立了大豆排种性能指标数学模型,分析气力条件下排种器设计参数对排种性能的影响规律。分析表明：气力条件下,排种性能指标主要受气压和作业速度影响,气压范围为1.4~1.8 kPa时粒距合格率达到85%以上,满足8 km/h速度以上大豆精密播种;充种角和清种角变化对排种性能影响不显著,充种角和清种角优化区域与常压条件下排种试验优化结果一致：充种角为46.35°、清种角为55°;气流方向对排种性能没有显著影响。

Uniform design was used to test the soybean seeding performance of an air-blowing vertical-rotor type precision seed-metering device in laboratory. Based on test results, regression models of seeding performance were constructed by uniform design software UST 1.0. The effects of designing and operating parameters of air-blowing vertical rotor seeder on its performance were investigated. The results suggest that seeding performance is sensitive to air pressure and operating speed in air-blowing condition. The qualified seeding rate is over 85 % in 1.4- 1.8 kPa air pressure and can satisfy the needs to seed soybean at over 8 km/h operating speed. Seeding performance of the air-blowing verticalrotor type precision seed-metering device is insensitive to seed-filling angle and seed-cleaning angle. The optimized results for seed-filling angle and seed-cleaning angle are consistent with the results at atmospheric pressure, which are 46.35° and 55° for seed-filling angle and seed-cleaning angle respectively. There is no remarkable influence of the air-blowing direction on seeding performance.