| 抛物母线叶片螺旋输送机运移及接触特性分析 |
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| 引用本文： | 李哲,吕志鹏,周思柱,翁志福.抛物母线叶片螺旋输送机运移及接触特性分析[J].科学技术与工程,2023,23(26):11165-11173. |
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| 作者姓名： | 李哲 吕志鹏 周思柱 翁志福 |
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| 作者单位： | 长江大学机械工程学院;长江大学机械结构强度与振动研究所;长江大学机械工程学院；长江大学机械结构强度与振动研究所 |
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| 基金项目： | 国家科技重大专项(2016ZX05038－001－LH002)； 湖北省水电机械设备设计与重点实验室基金 (2020KJX10) |
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| 摘 要： | 粮食乃生存之本，为了提高水稻种子生产运输的时效性，设计了一种抛物母线型叶片的螺旋输送机。采用离散单元法(discrete element method, DEM)的颗粒系统仿真，探究螺旋输送机输送水稻种子的运动规律，提高水稻种子卸料速率的同时降低叶片损耗。建立Hertz-Mindlin软球干颗粒接触模型，通过对比普通直母线叶片，分析了3种螺杆倾角下不同螺旋转速水稻种子的运移与接触特性。研究结果表明：抛物母线叶片将水稻种子的动能变化表现为加速入料、稳定输送和高速卸料3个工作阶段，且水稻种子在沿螺杆轴向前进的同时还具备不同频率和幅度的周向运动。相同转速下，600 r/min的0°倾角抛物母线叶片稳定输送水稻种子的卸料速率最高为82.3 g/s,但90°倾角的水稻种子回流现象较为明显，平均卸料速率降低了77.8%。相同倾角下，45°的1 800 r/min高转速时，抛物母线叶片水稻种子的法向重叠量相较直母线叶片最大减小了10.2%;90°倾角下1 300～1 800 r/min中高转速时，抛物母线叶片水稻种子的平均接触数小于直母线叶片1.3%,降低了运输过程中叶片的磨损程度。研究结果揭示了水...
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| 关 键 词： | 螺旋输送机 抛物母线叶片 离散单元法 卸料速率 法向重叠量 |
| 收稿时间： | 2022/10/16 0:00:00 |
| 修稿时间： | 2023/8/31 0:00:00 |
Analysis of Transport and Contact Characteristics of Parabolic Generatrix Blade Screw Conveyor |
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| Affiliation: | School of Mechanical Engineering, Yangtze University; Institute of Mechanical Structure Strength and Vibration, Yangtze University |
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| Abstract: | Grain is the foundation of survival. In order to improve the timeliness of crop production and transportation, a kind of screw conveyor with parabolic blade was designed. Discrete element method (DEM) particle system simulation was used to explore the motion law of rice seeds transported by screw conveyor. Improve the discharge rate of rice seeds and reduce the blade consumption. A Hertz-Mindlin contact model was established to analyze the transport and contact characteristics of rice seeds under three helical angles and different helical speeds by comparing the ordinary straight generatrix blades.The results showed that the parabolic generatrix blades express the kinetic energy change of rice seeds into three working stages: accelerated feeding, stable conveying and high-speed discharging, and the rice seeds also have different frequency and amplitude of circumferential motion while advancing along the axial direction of the screw. At the same speed, the highest discharge rate of 82.3 g/s is achieved for 0° inclined angle parabolic generatrix blades stabilized transport of rice seeds at 600 rpm, but the phenomenon of rice seed reflux is more obvious at 90° inclined angle, and the average discharge rate is reduced by 77.8%. At the same inclination angle, the normal overlap of rice seeds at 45° with a high speed parabolic generatrix blades at 1 800 rpm is reduced by a maximum of 10.2% compare to straight generatrix blades. The average contact number of rice seeds in parabolic generatrix blades is 1.3% less than straight generatrix blades at 1 300 rpm~1 800 rpm of 90° inclined angle, which reduces the degree of blade abrasion during transportation. The research reveal the transport law of rice seeds, which can provide a theoretical basis for the mechanized and efficient transportation of screw conveyor. |
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| Keywords: | screw conveyor parabolic generatrix discrete element method discharge rate normal overlap |
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