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作 者:尚蕾[1] 宋占华[1] 李玉道[1] 王丽军[1] 李法德[1,2]
机构地区:[1]山东农业大学机械与电子工程学院,山东泰安271018 [2]山东省园艺机械与装备重点实验室,山东泰安271018
出 处:《中国烟草科学》2014年第3期99-103,共5页Chinese Tobacco Science
基 金:中国烟草总公司山东省公司科技重大专项和重点项目(KN216)
摘 要:为设计机械化取苗机构,以山东农业大学温室大棚培育的"革新一号"移栽期烟草钵苗为试验材料,在万能试验机上对烟苗进行了钵苗拔取、烟苗茎秆拉伸、压缩、弯曲和剪切力学性能试验。结果表明,营养基质含水率为(52.70±6.50)%时,烟苗拔取力为(2.09±1.28)N;烟苗茎秆含水率为(85.15±2.21)%时,烟苗茎秆抗拉强度为(1.96±0.68)MPa;烟苗茎秆径向抗压强度以及底部、中部的轴向抗压强度分别为(0.096±0.043)、(1.20±0.34)、(1.28±0.28)MPa;简支梁、悬臂梁弹性模量分别为(0.0042±0.0018)、(0.0130±0.0062)MPa;剪切强度为(1.64±0.39)MPa。此结果为机械化取苗机构的设计提供了理论依据。In order to design a mechanized seedlings pickup machine, ‘Gexin 1’ tobacco seedlings, which was in nurture transplanting period, were taken from the greenhouses of Shandong Agricultural University as test material. Some mechanical properties of the seedlings such as plucking force, tension and compression intensities of the seedlings stem, bending intensity, and shearing intensity were carried out with a universal test machine. The results showed that the plucking force of tobacco seedlings was (2.09±1.28)N when the nutrient substrate moisture content was of (52.70±6.50)%;the stem tension intensity was of (1.96±0.68)MPa when the moisture content of the tobacco seedlings stem was of (85.15±2.21)%;the stem radial compression intensity and the axial compression intensity of the stem at the bottom and the central part were of (0.096±0.043), (1.20±0.34), (1.28 ±0.28)MPa, respectively; the charpy elastic modulus and the cantilever elastic modulus were of (0.0042±0.0018), (0.0130 ±0.0062) MPa; the shear intensity was of (1.64±0.39) MPa. The results provide a theoretical basis for the design of mechanized seedlings pickup machine.
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