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当前位置: 首页 > 文章 > 玉米清选组合孔筛体设计与试验 农业机械学报 2019 (5) 104-113
Position: Home > Articles > 玉米清选组合孔筛体设计与试验 Transactions of the Chinese Society for Agricultural Machinery 2019 (5) 104-113

玉米清选组合孔筛体设计与试验

作  者：
王立军;冯鑫;郑招辉;于泳涛;刘天华;马杨
单  位：
东北农业大学工程学院
关键词：
玉米籽粒收获机;振动筛;贝壳筛;透筛模型;组合孔筛
摘  要：
为增强玉米清选筛体对高喂入量脱出物的筛分能力,以适应玉米联合收获机快速发展要求,以玉米籽粒为研究对象,对贝壳筛体作业机理进行分析,探究筛分过程中籽粒在贝壳筛体上运动状态,得到贝壳筛对籽粒的筛分特性和籽粒的透筛模型.为增大籽粒透筛概率,基于贝壳筛和圆孔筛的筛分特性,设计了贝壳-圆孔组合孔筛体.在玉米脱出物不同喂入量条件下进行仿真试验,对组合孔筛、圆孔筛、贝壳筛作业效果进行对比,结果表明:在喂入量为6 kg/s情况下,组合孔筛作业后的籽粒损失率、清洁率和筛分时间分别为1. 15%、97. 53%和5. 50 s,均满足国家标准要求,且组合孔筛的籽粒损失率比圆孔筛和贝壳筛分别减少了5. 79个百分点和7. 84个百分点,通过台架试验验证了仿真结果准确性.在喂入量分别为5 kg/s和6 kg/s条件下对组合孔筛与阶梯筛筛分效果进行对比,在喂入量为6 kg/s、气流速度为12. 8 m/s、气流方向角30°、振动频率为5. 15 Hz时,组合孔筛相对阶梯筛籽粒损失率降低5. 60个百分点,筛分时间缩短0. 93 s,清选效果提高.
作  者：
WANG Lijun;FENG Xin;ZHENG Zhaohui;YU Yongtao;LIU Tianhua;MA Yang;College of Engineering,Northeast Agricultural University;
关键词：
maize grain harvester;;vibration sieve;;shellfish sieve;;model of maize sieving;;combined sieve
摘  要：
Aiming to increase the carrying capacity of maize cleaning sieve to high feed quantity to meet the requirement of rapid development of maize grain harvester. Through the analysis of mechanism of shellfish screening,the screening performance and the model of maize screening were obtained. In order to increase the probability of grain permeation,based on the screening characteristics of shell sieve and round sieve,the maize combined sieve which consisted of the shapes of shellfish and round hole was designed. Under the conditions of different feeding quantities of maize extractives,the simulation tests which included combined sieve,single round hole sieve and single shellfish screening test separately were carried out,then their screening performances were compared and analyzed. The results showed that compared with the single round hole sieve and the shellfish sieve respectively,the loss rates of maize of combined sieve was decreased by 4. 79 percentage points and 7. 85 percentage points when the feeding quantity was 5 kg/s,the loss rates of maize of combined sieve was decreased by 5. 79 percentage points and 7. 84 percentage points when the feeding quantity was 6 kg/s. Under the condition of feeding quantity was 2 ～ 6 kg/s,the cleaning rate and sieving time were 99. 22% to 97. 53% and 4. 87 s to 5. 50 s partly,thus all indicators met the national standards. The performance of the combined sieve was verified by bench test. The loss rate of maize,cleaning rate of maize and screening time of the combined sieve were 1. 09%,95. 94% and 6. 48 s,when feeding quantity was 6 kg/s,respectively. Compared with the stepped sieve,the combined sieve grain loss rate was reduced by 5. 60 percentage points,the screening time was shortened by 0. 93 s,and the performance of the cleaning device was further improved.

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