以工字钢作为电动葫芦和电动单梁悬挂起重机的运行轨道时,除整体承受弯曲以外,在轮压作用区域,车轮还对工字钢的下翼缘产生局部的弯曲和挤压作用。过去以普通工字钢(GB706-65)作为原TV型电动葫芦的运行轨道,没有出现过材料的破坏,因而没有引起人们的重视。近年来,冶金部推广使用轻型工字钢,它的翼缘较薄,同时电动葫芦又作了更新 When using I-beam as the running track of electric hoist and electric single-girder suspension crane, the wheel also locally bends and squeezes the lower flange of the I-beam in the region where the wheel is pressed in addition to the overall bending. In the past to ordinary I-beam (GB706-65) as the original TV-type electric hoist orbit, there has been no destruction of materials, which did not draw the attention of people. In recent years, the Ministry of Metallurgical promote the use of lightweight I-beam, its thin flange, while the electric hoist has been updated