芦苇不同铺放状态下可压缩性分析
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摘要
为解决现有芦苇打包机压缩密度低、成型芦苇包质量不稳定的问题,针对不同含水率的芦苇在竖直、平铺和杂乱3种状态进行压缩试验及数据对比分析。结果表明:芦苇压缩过程可分为松弛阶段、芦苇破碎阶段和压紧阶段;当达到相同压缩密度259 kg/m~3时,芦苇在平铺状态下所需的最大压缩力及压缩时间均小于在杂乱铺放状态;芦苇轴向、径向力学差异性明显,在压缩过程中最理想加载方向是芦苇的径向方向,径向平铺状态的压实效果好,致密成型的芦苇包质量稳定;芦苇的体积模量与压缩密度间呈指数型增长趋势,压缩密度越大,抗压缩性能越强。试验结果为设计打包机理顺芦苇碎料装置提供了基础数据和理论依据。
To solve the problem that the existing reed baler has a low compression density and the quality of a molded reed bag is unstable. In this study,the compression tests of three different states of reeds with different moisture contents were performed in the vertical,flat and messy conditions. The results showed that the reed compression process can be divided into three stages: relaxation stage,reed crushing stage and compaction stage. When the same compression density of 259 kg/m3 is reached,the maximum compressive force and compression time required for reeds in tiled condition are both less than in the disorderly laying state; reeds have obvious axial and radial mechanical differences; the ideal loading direction in the compression process is the radial direction of the reeds,and the compaction effect in the radial tiling state is good,and the quality of the compact molded reed bags is stable. The reed 's bulk modulus and compression density show an exponential growth trend. The greater the compression density,the stronger the compression resistance. The experimental results provide basic data and theoretical basis for the design of the baling reed material device of the baler.
To solve the problem that the existing reed baler has a low compression density and the quality of a molded reed bag is unstable. In this study,the compression tests of three different states of reeds with different moisture contents were performed in the vertical,flat and messy conditions. The results showed that the reed compression process can be divided into three stages: relaxation stage,reed crushing stage and compaction stage. When the same compression density of 259 kg/m3 is reached,the maximum compressive force and compression time required for reeds in tiled condition are both less than in the disorderly laying state; reeds have obvious axial and radial mechanical differences; the ideal loading direction in the compression process is the radial direction of the reeds,and the compaction effect in the radial tiling state is good,and the quality of the compact molded reed bags is stable. The reed 's bulk modulus and compression density show an exponential growth trend. The greater the compression density,the stronger the compression resistance. The experimental results provide basic data and theoretical basis for the design of the baling reed material device of the baler.
引文
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[2] Faborode M O,Ocallaghan J R. Optimizing the compression/briquetting of fibrous agricultural materials[J]. Journal of Agricultural Engineering Research,1987,38(4):245-262.
[3] Faborode M O. Rheological model for the compression of fibrous agricultural materials[J]. Journal of Agricultural Engineering Research,1989,42(1):165-178.
[4] Adapa P,Tabil l,Schoenau G. Compression characteristics of selected ground agricultural biomiass[J]. Agricultural Engineering International the CIGR Journal,2009,1(11):1347.
[5] Anthony W S. Concept to reduce cotton bale packaging forces[J]. Applied Engineering in Agriculture,2001,1(4):17.
[6]吕江南,龙超海,赵举,等.横向喂入式苎麻剥麻机的设计与试验[J].农业工程学报,2013,29(16):16-21.
[7]吕江南,龙超海,何宏彬.苎麻纤维初加工机械的研究现状与发展[J].农业机械学报,2000(1):123-125,75.
[8]王春光,敖恩查,邢冀辉,等.钢辊外卷式圆捆打捆机设计与试验[J].农业机械学报,2010,41(S1):103-106,102.
[9]范林,王春光,王洪波,等.揉碎玉米秸秆可压缩性研究[J].农业机械学报,2008(11):76-80.
[10]李旭英,杨明韶,鲁国成,等.苜蓿压捆过程中压缩与恢复应力传递规律[J].农业工程学报,2014,30(16):61-67.
[11]张翔,张立新,成斌,等.粗纤维压缩打捆机构模态与谐响应分析[J].农机化研究,2015,37(4):23-26,39.
[12]刘新柱,王玉花,韩平,等.稻草秸秆压缩特性研究[J].农机化研究,2016,38(6):225-229.
[13]周晓杰.苜蓿可压缩性及压缩过程中径向压缩力的测试研究[D].呼和浩特:内蒙古农业大学,2008.
[14]杜健民,李旭英,白雪卫,等.压缩过程影响草捆形态稳定性的流变学试验研究[J].农业工程学报,2006,22(2):103-106.