【作者】 庞奇；

【导师】 师清翔；

【作者基本信息】 河南科技大学 ， 农业机械化工程， 2009， 硕士

【摘要】 微型小麦联合收割机是适用在山区和丘陵地区以及小块地作业的收获机械。河南科技大学研制的该小麦联合收割机采用的旋风分离清选系统具有结构简单、体积小、重量轻、工作可靠和配置方便等特点,用作微型小麦收获机械清选装置前景广阔。但是,该清选装置中扬谷器和吸杂风机的转速较高,清选物料中轻杂物过多时,清选质量和工作稳定性降低。为了解决上述问题,需要弄清清选系统内部流场及物料运动状态。本课题利用三孔探针和毕托管研究了扬谷器物料管道和旋风分离筒内气流的运动状态,以及扬谷器进气口的大小对物料管道气流的影响;同时,利用高速摄像设备,拍摄了物料在扬谷器物料管道和旋风分离筒内运动状态。试验结果表明,扬谷器进气口的大小对物料管道内气流有较大的影响。旋风分离筒内气流的切向速度由筒壁向分离筒的中心逐渐减小,气流的轴向速度以中心最高、周边最低;分离筒轴线附近处的静压最低。高速摄像仪记录的旋风分离筒内的物料运动状态与气体测量结果相符。更多还原

【Abstract】 The micro-combine harvester of wheat is suitable for working in the mountainous , hilly areas and small fields. It is developed by Henan University of Science and Technology. The cyclone separating of this machine has features of simple structure, small volume, light weight, reliable operation and configuration of convenient. It is bright prospect that the machine is used as a cleaner with micro-mechanical devices of wheat harvest. However, the rotational speed of the winnower which is too high ,leads to the machine loss more power. At the same time, some straw remains when light materials are too excessively in the cyclone separator, which causes the machine not working normally. In order to solve these problems, Three-hole probe is used to study the folw motion status of the winnower pipe and cyclone separator, and the pipe flow affected by the size of the entrance to winnower is also encluded in the project. In the meanwhile, we use high-speed camera to photo the motion status of materials inside cyclone and winnower pipe. The results show that the size of the entrance to winnower has great impacts on the pipe flow. What can be found from the survey is that: the tangential velocity of flow inside cyclone reduce gradually from edge to center of the cyclone, while the axial velocity is just contrary; the static pressure near the axis of the cyclone is the lowest. The motion status inside the cyclone recorded by the high speed camera conforms to the flow measurement.更多还原