Study Of Double Longitudinal Axial Flow Rice And Wheat Combine Harvester’s Cleaning Device

Cleaning device is the core component of corn combine harvester. This paper introduces the research status about the cleaning device at home and abroad, and introduces the development of series products of the longitudinal axial flow combine harvester and its cleaning device both at home and abroad. Based on the science and technology development found projects of SINOMACH, researching the cleaning device of the double longitudinal axial flow rice and wheat combine harvester. Through the orthogonal test of 3 factors and 3 levels, and the optimal combination plan is got out. And then the validation of the optimal combination plan is verified through the repeated test. In order to further explore the airflow field how to affect the cleaning result, it is carried out that research about the type of cleaning fan blade how to affect the airflow field of the outlet of the cleaning fan and research about the airflow field in the sieve surface when the cleaning loss rate is optimal scheme and impurity rate of seed is optimal scheme.Based on the processing and analysis of the field experiment data and the airflow field test data, the main research conclusions are as follow:(1) In this paper, the optimal parameter combination scheme of the cleaning device:the cleaning fan blade type is 6 straight blades, the wind deflector angle is 0°(parallel), and the vibrating screen crank speed is 440r/min. Through repeated test validation, the scheme is excellent performance, and satisfies the job performance requirements.(2) In this paper, the most significant factor to the cleaning loss rate is the cleaning fan blade type, and the most significant factor to the grain impurity rate is the up wind deflector angle.(3) At outlet of the cleaning fan, the speed of the down outlet is maximal, the middle outlet the second place, and the down outlet minimal. Much blades and the blade type is forward-curved, are good at enhancing the cleaning device performance.(4) When the optimal cleaning loss rate scheme, the wind speed in the front of the up screen is relatively larger. When the optimal grain impurity rate scheme, the difference of the wind speed in the front and middle of the up screen is relatively smaller, and the average of the wind speed in the front and middle of the down screen is relatively larger.