Wang Defu, Jiang Zhiguo, Li Baiqiu, Wang Guofu, Jiang Yiyuan. Experiment on sliding friction characteristics between rice straw and baler steel-roll[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2017, 33(21): 44-51. DOI: 10.11975/j.issn.1002-6819.2017.21.005
    Citation: Wang Defu, Jiang Zhiguo, Li Baiqiu, Wang Guofu, Jiang Yiyuan. Experiment on sliding friction characteristics between rice straw and baler steel-roll[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2017, 33(21): 44-51. DOI: 10.11975/j.issn.1002-6819.2017.21.005

    Experiment on sliding friction characteristics between rice straw and baler steel-roll

    • Abstract: Rice straw resource is abundant in China, and annual output of rice straw has been over 200 million t. In recent years, as a kind of renewable biomass resource, rice straw is being used widely in new areas. However, because of the scattered distribution, the loose structure and the large volume of rice straw resource, it is difficult for rice straw to be stored and transported, which has seriously restricted the large-scale utilization of rice straw resource. It is very important to use the round baler to harvest rice straw for the comprehensive utilization of rice straw. In view of the fact that the basic research of the steel-roll round baler is less in China, it is urgent to carry out the basic research on the sliding friction between rice straw and steel-roll. In order to provide the basis for the design of the steel-roll round baler, the experiments of the sliding friction characteristics between rice straw and steel-roll (prepared by the rolling of cold rolled plate of carbon steel) were performed in this paper. Using the self-made device for measuring steel-roll sliding friction coefficient, the effects of moisture content of rice straw, positive compressive stress, steel-roll linear speed, and the interaction between them on the sliding friction coefficient between rice straw and steel-roll were studied by L27 (313) orthogonal experiment. Three factors and 3 levels, 3 samples and a total of 18 kinds of treatments were selected and each treatment repeated 5 times, which were used to determine the significance of the impact of factors and the order of factors. Then 5 levels of moisture content of rice straw, positive compressive stress and steel-roll linear speed were respectively selected in the single factor experiment, and the influence of each factor on the experimental index was studied, obtaining the corresponding regression equations and the coefficients of determination. The results of orthogonal experiment showed that: The sliding friction coefficient between rice straw and steel-roll was significantly affected by moisture content of rice straw and positive compressive stress, while less significantly affected by steel-roll linear speed, and the influencing order of factors was moisture content of rice straw > positive compressive stress > steel-roll linear speed. In the interaction between the factors, the sliding friction coefficient between rice straw and steel-roll was significantly affected by the interaction between moisture content of rice straw and positive compressive stress. The results of single factor experiments showed that: The sliding friction coefficient between rice straw and steel-roll increased with the increasing of moisture content of rice straw, decreased with the increasing of positive compressive stress, and slowly decreased with the increasing of steel-roll linear speed. When the moisture content of rice straw was 10%-70%, the positive compressive stress was 1-9 kPa and the steel-roll linear speed was 0.2-0.8 m/s, the range of sliding friction coefficient between rice straw and steel-roll was 0.353-0.612. Regression models had a good fitting degree with experimental results, and could be used to analyze the changes of the sliding friction coefficient between rice straw and steel-roll. The results can provide theoretical basis for the research and design of key components of steel-roll round balers.
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