关键词: 小型水稻收割机, 结构优化, 气流场仿真, 清洁率, 损失率

Abstract: Cyclone cleaning device has  small size, light weight and simple structure, etc. merits and has been widely used in small rice combine harvester. But there are problems like high loss rate, no ideal cleaning effect when choosing wet material in selection process, etc.. This paper further optimized and improved the inside structure of cycrong seperator; and carried out comparative analysis on the airflow field inside of scycrong seperator before and after optimization by software Fluent 15.0. Taking suction rotation rate, grain winnower rotation rate and baffle inclination angle as experimental factors, and cleaning ratio and loss rate as evaluated index, this paper operated a bench test by ternary quadratic orthogonal test method. The results indicated that when the suction rotation rate was 2 452 r/min, winnower rotation rate was 783.8 r/min and the baffle inclination angle was 41°, the device showed the best efficiency. Then the cleaning rate of the machine was 98.26%, the cleaning loss rate was 0.003 5%. The results of the controlled trial indicated that the higher rate of water content the device had, the better performance it would get. These results provided references for the optimal design of cyclone cylinder structure in the later period.

Key words: small rice combine harvester, structure optimization, simulation of airflow field, cleaning ratio, loss ratio