Bridge crane "roll over" accident

  China's steel  bridge gantry crane  is the most important metallurgical and other large enterprises, the most commonly used lifting, transportation and many other important equipment operation. Bridge crane known as "crane." Bridge crane "over volume" accident also called "hook heaven", belonging to one of the overhead crane fatalities. The time of the accident, the light fixed pulley group squeeze bad, damaged wire rope scrap; severe group and the hook hanging objects fall to the ground, the consequences could be disastrous. Crane accidents nationwide class "over volume" accident also accounted for a large proportion of the resulting economic losses and even very serious casualties. Therefore, the need for prevention and control of serious governance. "Roll over" Accident Analysis: It is widely believed, as long as the bridge  Steel crane  limit switch so that it will not happen "roll over" accident, this is a wrong understanding.
     Even if the limit switch itself, under normal circumstances, there are still many reasons that can cause "sky hook", such as: mechanical reasons - the brake is not enough tight, the limit caused by vertical swinging foot "over volume"; electrical cause - operation short circuit, grounding, wiring error, main contact adhesions, the controller unit is damaged or with the gap caused by the ultra-poor "over volume"; operational reasons - control handle positioning error, running hook swing tour group had curl caused by "over volume" and so on. Meanwhile, we can not superstitious so-called dual limit setting, because for their own reasons not limit switch triggered by the "roll over" accident, the more the limit switch will not help. Thus,jib crane the control "over volume" accident was a comprehensive work, we must overcome the simplicity of understanding and one-sidedness of the accident in order to achieve a more comprehensive and effective containment.