桥(门)式起重机主梁的下挠度,是衡量主梁性能的一个重要参数,在日常起重机检验中都要测量该值。传统的检测方法是用水平仪和钢尺进行测量,现改用激光测距仪进行测量,实践证明比传统检测方法方便,检测结果的数据更准确。本文主要介绍激光测距仪检测起重机主梁下挠度的方法、注意事项和比对试验的结果。1激光测距仪进行检测的原理、方法置激光测距仪于起重机主梁跨中的地面上(见图1),将空载小车开至任意一端梁处停下,开启激光 The deflection of the main girder of a bridge crane is an important parameter for measuring the performance of the main girder. This value should be measured in the daily crane inspection. The traditional detection method is to use the spirit level and steel ruler to measure, use the laser range finder to measure now, the practice proves convenient than the traditional detection method, the data of the test result is more accurate. This article mainly introduces the method of laser range finder detecting the deflection of main girder of crane, precautions and the result of comparison test. A laser range finder to detect the principle and method of laser range finder in the crane over the ground in the ground (see Figure 1), the no-load car open to either end of beam stop, turn on the laser