Design and test on double cylinder screen with different rotational speed in cleaning device for oats
To solve the easy blockage problem in the cleaning devices of the oat combine harvester fan double layer plane causing by high moisture and high impurity content,based on the physical characteristics of oat,a cooperate with centrifugal fan is designed using differential double cylinder screen cleaning device,by double cylinder screen sharing screening pressure,by double cylinder sieve differential inversion can reduce the blocking screen phenomenon,the flow aid device in the screen is used to improve operation efficiency.Conduct an in-depth analysis of the dynamic motion characteristics of oats within a cylindrical sieve,and based on this analysis,design the structure of a double cylinder sieve.Based on a detailed analysis and calculation of the rotational speed,effective screening area,and flow aid device parameters of the cylindrical sieve,the Bayou 1 oat variety was selected as the research object.The angle of cylinder screen,the rotating speed of cylinder screen and the rotating speed of fan are selected as test factors,grain impurity rate and loss rate of cleaning as test indexes,the ternary quadratic orthogonal rotation combined test was carried out,the results showed that when the angle of cylinder screen was 3°,the rotating speed of cylinder screen was 51 r/min and the rotating speed of fan was 1 403 r/min,the grain impurity content rate and cleaning loss rate were 2.15%and 1.54%,respectively.The study optimized the structure of the double cylinder screen and improved the cleaning performance of the cylinder screen,which provided theoretical reference for the design of the cleaning device of the oat combine harvester.
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