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为进行液压挖掘机型式试验中的强度试验,对挖掘机工作装置进行静态与动态应变测试。根据箱形断面在各种外力作用下的应力分布特点,在动臂、斗杆等应力集中的位置布置14个测点,采集铲斗斗齿挖掘受阻时各测点的静态应变时域信号和空载下降冲击、满载铲斗最快速度下降止动、满载铲斗最快速度上升止动过程中各测点的动态应变时域信号,在进行时域特征分析后得到各测点的应变数据,计算工作装置的安全系数,并判定安全系数是否符合相关规定。
For the hydraulic excavator type test strength test, the excavator working device for static and dynamic strain test. According to the stress distribution characteristics of box-shaped section under various external forces, 14 measuring points are arranged in the stress concentrated position such as booms and sticks, and the static strain time-domain signals No-load descending impact, full-load bucket maximum speed descent stop, fully loaded bucket fastest speed rise and fall of each measuring point during the dynamic strain time-domain signal, obtained after the time domain analysis of the characteristics of strain data , Calculate the safety factor of the working device, and determine whether the safety factor meets the relevant regulations.