王立军,冯鑫,武振超,李瑞,崔友强,李义博.玉米联合收获机贯流风阶梯式振动筛设计与试验[J].农业机械学报,2018,49(10):115-123.
WANG Lijun,FENG Xin,WU Zhenchao,LI Rui,CUI Youqiang,LI Yibo.Design and Test of Stepped Vibrating Screen with Cross Air for Maize Harvester[J].Transactions of the Chinese Society for Agricultural Machinery,2018,49(10):115-123.
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玉米联合收获机贯流风阶梯式振动筛设计与试验   [下载全文]
Design and Test of Stepped Vibrating Screen with Cross Air for Maize Harvester   [Download Pdf][in English]
投稿时间:2018-04-25  
DOI:10.6041/j.issn.1000-1298.2018.10.013
中文关键词:  玉米联合收获机  清选装置  振动筛  阶梯缓冲带
基金项目:国家自然科学基金项目(51475090)、黑龙江省科学基金项目(E2017004)和国家重点研发计划项目(2018YFD0300103)
作者单位
王立军 东北农业大学 
冯鑫 东北农业大学 
武振超 东北农业大学 
李瑞 东北农业大学 
崔友强 东北农业大学 
李义博 东北农业大学 
中文摘要:为降低筛分作业后籽粒损失率,同时保证籽粒清洁率,分析了玉米脱出物在气流场中运动状态,基于贝壳筛设计阶梯式筛体,并通过籽粒碰撞理论设计阶梯缓冲带,使籽粒在阶梯暂时“滞留”,减轻杂余对籽粒夹带作用。在筛面振幅19mm条件下,采用CFD-DEM耦合仿真方法,以入风口气流速度、气流角、阶梯高度和筛面振动频率为试验因素,玉米籽粒清洁率和损失率为试验指标,进行二次正交旋转组合试验。通过响应曲面方法对试验结果进行分析,利用软件对回归数学模型进行优化。结果表明:当气流速度、气流角、阶梯高度和振动频率分别为16m/s、25°、8.36mm和4.45Hz时,籽粒损失率和清洁率分别为1.69%和98.8%,通过贯流风阶梯式振动筛台架试验验证了结果的准确性。通过对比试验得到,阶梯式贝壳筛作业后籽粒损失率降低为2.12%,清洁率提高到99.16%,清选性能得到提高。
WANG Lijun  FENG Xin  WU Zhenchao  LI Rui  CUI Youqiang  LI Yibo
Northeast Agricultural University,Northeast Agricultural University,Northeast Agricultural University,Northeast Agricultural University,Northeast Agricultural University and Northeast Agricultural University
Key Words:maize harvester  cleaning device  vibrating screen  stepped buffer zone
Abstract:To reduce the loss of maize and ensure certain cleanliness of maize after screening operations, the movement of maize mixture was analyzed in the airflow field, and the stepped screen body was designed based on shell screen. The stepped buffer zone was designed by analyzing the theory of maize’s collision to temporarily retain grains in the stepper and reduce the effect on carrying maize from maize mixture and avoid maize accumulation in the ladder. However, maize debris directly went across the ladder. To make the screen amplitude as 19mm, the computational fluid dynamics and discrete element method (CFD-DEM) were coupled in the quadratic orthogonal rotational-combinational simulation tests. The factors were the inlet velocity and direction angle of airflow, height of the ladder and vibration frequency of screen. The indexes were the loss and cleanliness of maize grains collected. The test data were analyzed by the response surface method and the regression mathematical models were multi-objective optimized by using Design-Expert software. The results showed that the loss and cleanliness of maize were 1.69% and 98.8%, respectively, when the inlet velocity of airflow was 16m/s, the direction angle of airflow was 25°, the height of the ladder was 8.36mm, and the vibration frequency of screen was 4.45Hz. The performances met the requirements of corn harvest. The performance tests were done in the laboratory to verify the accuracy of the simulation results. The rate of maize loss was 2.12% and the cleanliness of maize grains collected was 99.16% after screening. Compared with the flat shell screen, the loss of maize grains across the stepped shell screen was reduced by 1.14 percentage points and the cleanliness of maize grains was increased by 1.98 percentage points. The cleaning performance of screen was improved.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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