牧草压缩过程应力松弛试验研究及压缩活塞的力学分析

发布时间：2018-07-03 16:26

本文选题：压捆机 + 压缩室截面　；参考：《农机化研究》2017年04期

【摘要】：应力松弛是牧草压缩过程中显著的流变学特性。研究压缩室不同截面下的应力松弛特性,可为牧草压捆机的压缩频率的确定提供理论依据。为此,以高密度压捆机为试验装置,以羊草为试验材料,分别以360mm×4 4 0 mm、3 6 0 mm×4 5 0 mm、3 6 0 mm×4 6 0 mm这3种压缩室截面进行试验,获得了压缩室不同截面下应力松弛特性。试验表明:在不同截面下开始应力松弛的前3s应力松弛明显,在3s之后应力随时间的推移而松弛放慢,超过10s应力松弛速率趋于水平,从尽可能使草片有较充分应力松弛和保证较高的生产率的综合角度出发,在实际牧草压缩生产中将压缩频率选在3~10s之间较合理。在试验的基础上,对压捆机压缩活塞进行力学分析,寻找出了压缩活塞工作过程中最容易变形的部位,为压捆机压缩活塞的设计及结构强度校核等提供了依据。
[Abstract]:Stress relaxation is a remarkable rheological property in the compression process of forage. The study of the stress relaxation characteristics under different sections of the compressing chamber can provide a theoretical basis for the determination of the compression frequency of the forage baler. For this reason, the high density baler was used as the experimental device and Leymus chinensis as the experimental material. The cross sections of three compressing chambers, 360mm 脳 440 mm, 360 mm 脳 450 mm, 60 mm 脳 460 mm, respectively, were tested. The stress relaxation characteristics under different sections of the compressing chamber were obtained. The experimental results show that the stress relaxation of the first 3 s at different cross sections is obvious, and after 3 s the stress relaxation slows down with time, and the stress relaxation rate of more than 10 s tends to be horizontal. In order to make the grass sheet fully stress relaxation and guarantee higher productivity, it is reasonable to select the compression frequency between 3 ~ 10 s in actual forage compression production. On the basis of experiment, the mechanical analysis of compression piston of baler is carried out, and the most easily deformed part of compression piston is found out, which provides the basis for the design and structural strength check of compression piston of baler.
【作者单位】：内蒙古农业大学机电工程学院;
【基金】：内蒙古自治区自然科学基金项目(2014MS0536)
【分类号】：S817.115

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