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Outline
Aiming to address the issue that the threshing and separation device of traditional soybean combine harvesters cannot adjust the threshing gap in real-time, resulting in uneven material distribution in the threshing chamber and consequently high rates of soybean grain breakage, unthreshed grain loss, and entrainment loss, an adjustment system was designed based on the real-time matching of feed rate and threshing gap. Using the feed rate, threshing section gap, and separation section gap as experimental factors, and the grain breakage rate, unthreshed grain rate, and entrainment loss rate as evaluation indicators, bench tests, adaptive threshing gap adjustment tests, and comparative tests were conducted. The experimental results indicated that the average adjustment errors of the control system for the threshing and separation section gap were 0.49 mm and 0.47 mm, respectively. Under the test combinations where the feed rates were 0~2 kg/s, 2~3 kg/s, and 3~4 kg/s, with corresponding threshing section gaps of 15 mm, 23 mm and 30 mm, and separation section gaps of 15 mm, 20 mm and 27 mm, the grain breakage rate, unthreshed grain rate, and entrainment loss rate were 2.73%, 0.30% and 0.42%, respectively. Compared with the constant gap tests, these values were reduced by 0.39, 0.27 and 0.28 percentage points, respectively. All evaluation indicators from the adaptive threshing gap adjustment tests outperformed those from the comparative tests. The research result can support the development of adaptive threshing gap control systems and the intelligent of the soybean combine harvester.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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