1.检测标准问题吊钩的开口度是对吊钩质量的一项考核指标,但我国目前尚没有通用的吊钩开口度检测标准。因创优需要,为开展这项工作曾规定:“吊钩开口度为加载两倍额定负荷,卸载后检查变形量为≤0.25%”。在国际标准ISO 2141中,规定的比较具体:“挂上的试验载荷撤掉(见表1)之后,吊钩不得产生永久变形,也不得有其它任何看 1. Inspection standards Hook opening degree is an assessment of the quality of the hook indicators, but there is no universal hook opening degree test in China. As a result of excellence, in order to carry out this work has provided: “Hook opening degree is loaded twice the rated load, check the deformation after unloading ≤ 0.25%.” In the international standard ISO 2141, more specific provisions: "hanging test load removed (see Table 1), the hook shall not produce permanent deformation, nor any other look