Study on Improvement of Cleaning Characteristics of Head Feeding Type Combine

本研究的目的是阐明联合收割机清洗机的清选分离特性。1998年，为了分析摇头式联合收割机清选装置中稻谷、谷壳、秸秆混合物的流动情况，在谷斗背面安装了一个小型的CCD-TV摄像机和一个光源。在额定发动机转速的情况下，不能识别剩余的粗米和谷壳。在发动机转速低于2000r.pm的情况下，在第二个投掷装置中识别出剩余的粗米和谷壳。用热线风速仪测量了风机的风速和静压。当发动机转速在1800~2000r.pm范围内时，粮斗上的风速为0.8~13.3m/S，风压为0.1~0.4mmAq。结果表明，清洗室边缘的风速较大。清洗室内的主风呈45~60度的上升线。第二投手的风速不均匀，在投手的中心位置风速减小。

This study aimed to clarify the cleaning and separating characteristics of cleaner of a head feeding type combine. In 1998, in order to analyze the flow of the mixture of rough rice, chaff, and straw in the cleaning device of head feeding type combine, a small CCD-TV camera and a light source were built in the back side of grain shieve. It is not recognized the remainder of rough rice and chaff in case of the rated engine speed. In case that the engine speed decreased under 2000r.p.m., it is recognized the remainder of rough rice and chaff in the 2nd thrower. The wind velocity and the static pressure of fan were measured by a wind velocity meter with a thermal wire. When the engine speed was in the range of 1800〜2000(r.p.m.), the wind velocity on the grain shieve was in the range of 0.8〜13.3(m/s) and the static pressure of wind was in the range of 0.1〜0.4(mmAq).In 1999, the wind velocity and the wind direction were measured by a mold type wind velocity sensor at the center of cleaning chamber. It is clarified that the wind velocity was stronger at the edge of cleaning chamber. The main wind stream in the cleaning chamber shows the upward line with 45〜60 degrees. The wind velocity of the 2nd thrower is not uniform, and decreases at the center position of thrower.