【作者】 徐云云；

【导师】 倪长安；

【作者基本信息】 河南科技大学 ， 农业机械化工程， 2010， 硕士

【摘要】 为了满足山地、丘陵地区谷物机械化收获的需要,且考虑到我国手扶拖拉机拥有量巨大,河南科技大学研制开发了一种与10-12马力手扶拖拉机配套的微型谷物联合收割机,来替代农民繁重的体力劳动,其特点是体积小、操作灵活、易于翻越窄沟和陡坡。在实际工作过程中,其淸选分离部分常存在堵塞、淸选损失高、淸选效果较差等问题;为了满足淸选的需要不得不设置很高的风机转速,这就使得机器的振动、噪声增大,影响了机器的可靠性和机手的作业环境。本课题通过研究风机叶片数量、风机叶片型式及风机转速对淸选效果的影响规律,比较了风机叶片数量为3、6、9、12片,风机叶片型式为直叶片和弯叶片时的吸风口动压大小,设计出降低风机转速后不影响其排杂能力的新型风机;并且在微型机试验台上运用二次通用旋转组合实验方法对旋风分离清选系统的结构参数和运动参数进行试验研究,应用DPS试验数据处理软件分别得出它们对清洁率与损失率影响的拟合方程,由此对该系统的结构参数与运动参数进行了优化设计。试验结果表明,新设计的微型谷物联合收割机旋风分离淸选系统解决了淸选分离部分存在的问题,并且使整机的稳定性得到很大提高,有利于微型机的推广与实际应用。更多还原

【Abstract】 In order to satisfy the requirement of harvesting in mountain and hilly areas, also considering that the ownership of hand tractor in China is large, Henan University of Science and Tecnologia has designed a micro-combine which is fixed to 10-12 horsepower hand tractor, to relax farm’s heavy works. Its characteristic is small, flexible operation, easy to climb over narrow groove and abrupt slope. But it still has some problem such as blocking in cleaning and seperating part, high losing while cleaning, and bad effect after cleaning; the whole machine’s stability lows and and the operator’s environment becomes worse and there is more serious viberation and noise while a high speed of fan is determined to satisfy cleaning. This article, through researching on the affects of fan’s blade number and blade shape and fan’s rotation speed on the cleaning effect, has compared dynamic pressure near by exhaust inlet while 3, 6, 9, 12 blades are fixed, and while different kinds such as straight blade and bending type of blade are fixed to the fan; also optimized system’s structure and kinematic parameters by using versatile regressive rotary compound experimental method to test on the rotation speed of winnower and new fan’s rotation speed and height of the cyclone separator, using test data processing software application DPS to calculate the fitting equation, which can reflect the influence of such factors on cleaning rate and losing rate. The result shows that the new designed micro-combine cleaning and seperating system has resolved aforesaid problems, and enhanced the stability of complete machine, which is useful to extend this kind of machine and be practically operated.更多还原