Study on Improvement of Cleaning Characteristics of Head Feeding Type Combine

本研究旨在阐明头喂式联合收割机清洗机的清洗分离特性。1998年，为了分析头部进料式联合收割机清洗装置中粗米、糠和秸秆混合物的流动情况，在谷斗背面安装了小型ccd电视摄像机和光源。在发动机额定转速的情况下，不承认剩余的粗米和箔条。如果发动机转速降到每分钟2000转以下。在第二次抛掷中，可识别出剩余的粗米和糠。采用带热丝的风速仪测量风机的风速和静压。当发动机转速为1800 ~ 2000转/分时，谷粒上的风速为0.8 ~ 13.3(m/s)，风压为0.1 ~ 0.4（mmAq）。1999年，在清洗室中心采用模具式风速传感器测量风速和风向。结果表明，在清洗室边缘处风速较大。清洗室主气流呈45 ~ 60度向上线。第二个投掷者的风速不均匀，在投掷者的中心位置减小。

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.