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以玉米秸秆含水率与秸秆力学特性相互关系为基础,采用正交试验法,研究了秸秆含水率、还田机刀型、刀轴转速对玉米秸秆粉碎特性的影响。结果表明:随秸秆含水率的增加,秸秆抗剪强度减小,当含水率大于30%时,抗剪强度随含水率的增加变化不显著;秸秆含水率为20%是秸秆抗拉强度拐点,大于20%时抗拉强度随秸秆含水率增加而增大,低于20%时抗拉强度受秸秆含水率影响不显著;秸秆含水率、还田机刀型、刀轴转速对秸秆粉碎长度合格率均有显著性影响,秸秆含水率和刀轴转速大于刀型;秸秆含水率、还田机刀型、刀轴转速对机具功耗均有显著性影响,刀轴转速>刀型>秸秆含水率。在实际生产中,建议在玉米收获后尽早进行粉碎,还田机刀型应优先选择Y型或L型,刀轴转速选择1 800r/min左右最优。本研究为选择合理的秸秆粉碎模式提供了理论基础
Based on the relationship between the moisture content of straw and the mechanical properties of straw, orthogonal experiments were used to study the effects of straw moisture content, returning blade length and rotating speed on the pulverizing characteristics of corn stalks. The results showed that the shear strength of straw decreased with the increase of straw moisture content. When the moisture content was more than 30%, the shear strength did not change significantly with the increase of water content. Straw moisture content was 20% When more than 20%, the tensile strength increases with the increase of the moisture content of the straw, and the tensile strength is not affected significantly by the moisture content of the straw below 20%. The straw moisture content, The moisture content of straw and the rotating speed of knife shaft were greater than those of knife type; the moisture content of straw, returning blade machine and rotating speed of knife shaft had significant effects on the power consumption of the machine tool, the rotating speed of knife shaft> knife type> rate. In actual production, it is recommended to crush maize as soon as possible after harvesting, returning to the machine type should be preferred Y-type or L-type, knife shaft speed of about 1 800r / min or so optimal. This study provides a theoretical basis for choosing a reasonable mode of straw crushing