关键词: 蔬菜, 小粒径种子, 窄行密植, 排种器, 精量排种, 单盘多行

Abstract: Aiming at the problems of high wind pressure requirements and large losses caused by the common air chamber of the existing multirow air suction seed metering device, a singledisc multirow independent airchannel type vegetable precision seed metering device was designed. It reduces the wind pressure value required for the seeding process and reduces the wind pressure loss. The structure design of the key components, such as seed metering disc, air channel disc, seed mixing device, seed cleaner, etc., was used to test the seed metering performance using the JPS-12 type seed metering device performance test bench, and the test results were analyzed. It can be known through a singlefactor test that the performance of the seed metering device is better in the range of negative pressure value of 1-2 kPa, seeding disk rotation speed of 15-25 r/min, and positive pressure value of 150-250 Pa. Taking the negative pressure value, the speed of the seed metering plate and the positive pressure value as the test factors, and taking the outermost circle pass index, missed index and replay index as the test indicators, a threefactor and threelevel orthogonal rotation combination test was carried out. The regression equation and response surface of each response index are established. The results show that the primary and secondary order of influence on the pass index, missed broadcast index, and replay index are negative pressure value, seeding disk speed, positive pressure value. The optimization results are tested and verified. When the negative pressure value is 1.7 kPa, the rotational speed is 19 r/min, the positive pressure value is 210 Pa, the pass index is 96.43%, the missed broadcast index is 1.63%, and the replay index is 1.94%, which meets the national standard requirements.

Key words:  vegetables, small particle size seeds, narrow row dense planting, seed metering device, precision seeding, single tray with multiple rows