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| Test and parameter optimization of regaining and cleaning in multiple-pass cleaning device |
| 1. Nanjing Institute of Agricultural Mechanization, Ministry of Agriculture and Rural Sciences, Nanjing, Jiangsu 210014, China; 2. School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, Shandong 255000, China |
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Abstract To solve the problems of the cleaning load caused by multiple removal in the multi-channel cleaning device of wheat combine harvester and the decreasing of cleaning performance caused by high impurity content of the secondary double-threshing auger, through bench test, the ratio of the total mass of retreat agglutinate from the weight of grains, stalks and residual extracts was used as test index. The re-extracting parts of the multi-channel cleaning device with great influence on cleaning performance were selected with feeding amount, damper opening, fan speed, upper and lower wind deflector angles as test factors. The Box-Benhnken central combination design method was used to conduct five-factor three-level response surface test, and the Design-Expert software was used to respond to the test results for surface analysis.The effects of various factors on the test index were investigated to create relevant mathematical model. The experimental results show that the damper opening, the upper and lower wind guide angles have great influence on the ratio of total mass of grain extractives, stalks and residual extractives. Through multi-objective optimization, the best matching parameters are obtained. Under the parameters combination, the test verification results of the mass ratios of grains, stalks and residual extracts are 89.90%, 2.51% and 7.50%, respectively,which indicates that the appropriate components ratio in the secondary double-throwing auger in the multi-channel cleaning device can meet the requirements of cleaning performance.
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Received: 19 November 2019
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2021, Vol. 42 
