桥式起重机发生“过卷”事故时,定动滑轮组挤坏、钢丝绳受损报废、吊物坠地,后果不堪设想。因此,必须落实防控措施。(1)调整好抱闸,使其保持适当的压力,否则由于制动器太松,可能造成因惯性而导致的“过卷”事故。(2)经常试验上极限开关是否灵敏可靠,防止因触点粘连、轴头限位失常等原因造成的极限控制失效。(3)桥式起重机极限安全距离大于0.5 m,采用双极限一蜗轮蜗杆式、一尺式配置时,蜗轮蜗杆极限的定位要低于尺式极限位置20 cm左右,这样既可做到分段控制,又对尺式极限起到保护作用,使双道保护更为完善。 Bridge crane “over the roll” accident, the fixed pulley block crowded, damaged wire rope scrapped, hanging objects fall to the ground, the consequences could be disastrous. Therefore, we must implement prevention and control measures. (1) Adjust the brake well to keep it under proper pressure, otherwise the brake may be too loose, which may result in “overvoltage” accident caused by inertia. (2) Often test the limit switch is sensitive and reliable, to prevent the contact adhesion, shaft limit abnormalities and other causes of limit control failure. (3) The ultimate safety distance of overhead cranes is more than 0.5 m. When using a double-limit worm gear, the limit of the worm gear should be lower than the limit position of about 20 cm in one-foot configuration. In this way, Control, but also play a protective role on the scale limit, so that dual-channel protection is more perfect.