压捆机压缩频率与压缩室三维应力关系的试验研究

压缩频率与压缩室三维应力直接影响牧草压捆机的生产率和结构尺寸,是主要设计参数。本研究以方草捆压捆机为试验设备,以羊草作为试验物料,研究开式压缩中压缩频率与压缩室三维应力的关系。在压捆机工作过程中,采集压缩过程中草物料在压缩室3个相互垂直方向上应力,分析三维应力间的相互关系,以及不同压缩频率下三维应力的变化趋势。结果表明:同一压缩频率下,三维应力值均随时间呈指数规律变化;压缩频率改变导致三维应力数值变化,但对三维应力本身变化规律无明显影响;单纯提高压缩频率会造成活塞轴向压缩力下降,进而影响其他两个方向应力。

Experimental Study on the Relationship between the Compression Frequency and the Three-dimensional Stress of the Compression Chamber

Compression frequency and three-dimensional stress of the compression chamber affects the productivity and structure size of hay baler directly, so it is the main design parameters. The research uses the hay baler as testing equip-ment and Leymus chinenses as testing materials to explore the relationship between compression frequency and the three-dimensional stress in opening compression. After collecting the three stress data that are in three mutually perpendicular directions of the herbage material in hay baler during its working process, we analyze the relationship among them and their variation trend in different compression frequency. The results show that in the same compression frequency, the three-dimensional stress values are exponentially with the time variation; different compression frequency change the value of the three-dimensional stress, but have no significant effects on the variation regulation of the three-dimensional stress. Simply raising the compression frequency will decrease the x-stress, thus affecting the other two stresses.