三七种子的大小对窝眼轮排种器充种性能的影响

【目的】探究窝眼轮排种器型孔尺寸与分级后三七Panax notoginseng种子的适配性对充种性能的影响规律,确定各级三七种子与适配型孔尺寸之间的关系。【方法】将三七种子分为4级,设计了4种不同型孔尺寸的窝眼轮排种器,利用离散元软件EDEM模拟各级种子在不同型孔尺寸排种器中的充种过程,分析各级种子在不同型孔尺寸排种器中的充种性能,得到各级种子适配排种器型孔尺寸,并进行了试验验证。【结果】各级三七种子均有适配型孔排种器,5.0～5.5和6.5～7.0 mm分级段的种子适配排种器型孔尺寸为7.5和8.5 mm;5.5～6.0和6.0～6.5 mm分级段的种子适配排种器型孔尺寸为8.0 mm。各分级段的种子在其适配排种器中充种时,合格指数均大于95.83%,漏播指数均低于2.00%,重播指数均低于2.17%。确定了种子长轴(l)与孔径(L)之间以及高轴(h)与孔深(H)之间的线性关系方程分别为L=0.58l+4.28和H=0.75h+3.96。【结论】排种器充种性能满足了三七播种的农艺要求,为窝眼轮排种器型孔尺寸的设计提供了理论依据。

Effect of Panax notoginseng seed size on seed-filling performanceof the socket-roller seeding apparatus

Objective To explore the influences of hole size of the nest hole wheel seed-metering and the adaptability of Panax notoginseng seeds on seed-filling performance, determine the relationships between P. notoginseng seeds of different grades and the adaptability shapes of seed-metering devices.Method We divided P. notoginseng seeds into four levels, and designed four different types of nest hole sizes. Using the discrete element software EDEM, we simulated the seed-filling process of graded seeds in seed-metering device with different size of nest hole. The seed filling performances of different grade seeds in seed-metering devices with different sizes were analysed, and the adaptability size of seed-metering device for the graded seeds was obtained. The experimental verification was carried out.Result P. notoginseng seeds of all levels have their suitable nest hole wheels. The 5.0-5.5 and 6.5-70 mm grading sections of seeds have the suitable hole sizes of 7.5 and 8.5 mm respectively, and both of 5.5-6.0 and 6.0-6.5 mm grading sections seeds match the hole size of 8.0 mm. When seeds of all gardes are filled in the adaptive seed-metering devices, the qualified indexes are more than 95.83%, the miss-seeding indexes are lower than 2.00% and the redundant-seeding indexes are 2.17%. The linear relationship between the long axis size of seed (l) and aperture (L), and the relationship between the height axis size of seed (h) and hole depth (H) are all established, which are L=0.58l+4.28 and H=0.75h+3.96, respectively.Conclusion The seed-filling performance fully meets the agronomic requirements of P. notoginseng seeding, which provides a theoretical basis for the design of nest hole size of the nest hole wheel seeding device.