目前,各地在起重机安全检验时,测量轮式起重机箱形伸缩臂的弹性位移,通常是将经纬仪架在地面上,通过测量臂架头部的标尺位移,作为臂架的弹性位移。用这种方法测得的弹性位移,不可避免地包含了起重机基础下沉,结构连接间隙及底架变形和液压缸回缩等因素的影响。这样,不仅测量和计算过程繁琐,而 At present, during the crane safety inspection, the elastic displacement of the box-shaped telescopic boom of the wheel crane is measured. Usually, the theodolite is placed on the ground, and the arm displacement is measured by measuring the displacement of the head of the boom. The elastic displacement measured by this method inevitably includes the influence of factors such as the sinking of the foundation of the crane, the clearance of the structural connection and the deformation of the underframe and the retraction of the hydraulic cylinder. In this way, not only is the measurement and calculation process cumbersome, but