种子气力特性对气吸式排种器排种性能的影响
发布时间：2018-09-13 06:43
【摘要】：本文以气吸式排种器以及绿豆、西瓜、食葵、油葵四类北方地区常见农作物种子为研究对象。首先,对四类种子的物理特性(外形尺寸、千粒质量、密度、滑动摩擦角等)参数进行测量,并对测量结果进行统计分析,在此基础上按照长度尺寸的不同,将每类种子进行分组;其次,按照分好的组分别对每类种子的气力特性(漂浮速度和漂浮系数)进行测试研究,对测试结果进行统计和分析,进而根据其气力特性的不同对种子进行分级;最后,分别对不同气力特性的种子在无振动和有振动(35Hz、50Hz、70Hz)工作时的临界真空度进行试验研究,探究种子气力特性与气吸式排种器排种性能之间的关系。研究结果表明:同一类种子不同气力特性条件下,在不施加振动条件时,三种吸种状态的临界真空度相差较小,最大差值仅0.2kPa。但对气吸式排种器施加不同频率的振动条件之后,同一类种子同一气力特性条件下的临界真空度急剧增大,且随着频率的增加,临界真空度呈逐渐增大的趋势。无论施加振动与否,同一吸种状态下,种子的临界真空度随着漂浮速度的增加而变大;同一气力特性条件下,随着吸种数量的增加,种子吸附临界真空度也随之增大。
[Abstract]:In this paper, the common crops seeds of mung bean, watermelon, sunflower and oil sunflower were studied. Firstly, the physical properties of four kinds of seeds (shape size, thousand grain mass, density, sliding friction angle, etc.) were measured, and the measured results were statistically analyzed. The seeds were divided into groups. Secondly, the aerodynamic characteristics (floating speed and floating coefficient) of each seed were tested according to the group, and the test results were statistically analyzed. Then the seeds are classified according to their pneumatic characteristics. Finally, the critical vacuum degree of the seeds with and without vibration (35 Hz / 50 Hz) is tested and studied respectively. To explore the relationship between seed pneumatic characteristics and seeding performance of suction metering device. The results show that the difference of critical vacuum degree of the three species is relatively small under the condition of different pneumatic characteristics of the same seed, and the maximum difference is only 0.2 KPA when the vibration condition is not applied. But the critical vacuum degree of the same kind of seed increases sharply under the condition of the same kind of seed and the same air force, and the critical vacuum degree increases gradually with the increase of frequency after the different frequency vibration conditions are applied to the suction seed metering device. With or without vibration, the critical vacuum degree of seed increased with the increase of floating speed, and the critical vacuum degree of seed adsorption increased with the increase of seed number under the same pneumatic characteristics.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S223.2
[Abstract]:In this paper, the common crops seeds of mung bean, watermelon, sunflower and oil sunflower were studied. Firstly, the physical properties of four kinds of seeds (shape size, thousand grain mass, density, sliding friction angle, etc.) were measured, and the measured results were statistically analyzed. The seeds were divided into groups. Secondly, the aerodynamic characteristics (floating speed and floating coefficient) of each seed were tested according to the group, and the test results were statistically analyzed. Then the seeds are classified according to their pneumatic characteristics. Finally, the critical vacuum degree of the seeds with and without vibration (35 Hz / 50 Hz) is tested and studied respectively. To explore the relationship between seed pneumatic characteristics and seeding performance of suction metering device. The results show that the difference of critical vacuum degree of the three species is relatively small under the condition of different pneumatic characteristics of the same seed, and the maximum difference is only 0.2 KPA when the vibration condition is not applied. But the critical vacuum degree of the same kind of seed increases sharply under the condition of the same kind of seed and the same air force, and the critical vacuum degree increases gradually with the increase of frequency after the different frequency vibration conditions are applied to the suction seed metering device. With or without vibration, the critical vacuum degree of seed increased with the increase of floating speed, and the critical vacuum degree of seed adsorption increased with the increase of seed number under the same pneumatic characteristics.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S223.2
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