宣化钢铁公司工程处主要担负着本公司高炉的大修任务。所使用的大型吊装设备中,有一台关键设备──旋转式桅杆起重机。它高达60米、总重70多吨,大小零件上千个,由十三、四根长三、四百米的拖拉绳拉拽着。为了防止这台起重机的滑轮组严重损耗,每天需要两个人攀上60米高空,为主杆 Xuanhua Iron and Steel Engineering Agency responsible for the company’s main blast furnace overhaul task. One of the key hoisting equipment used is the rotary mast crane. It is as high as 60 meters, weighing more than 70 tons, the size of the parts on thousands of thirteen, four long three, four hundred meters of tow rope pulling. In order to prevent this crane pulley block serious loss, every day two people need to climb 60 meters above sea level, as the main rod