There are always some irregular operation modes when the terminal crane is operating. In fact, the irregular and incorrect operation of the terminal crane will cause the service life of our terminal crane and the damage of the terminal crane and the occurrence of casualties The rock drill manufacturer told us that the five precautions about the use of the dock crane must not be touched, just like the mine area, which is dangerous, and no staff and other personnel can be offended: the first one is that the dock crane can not carry out overload lifting work, in fact, how dangerous it is, not to mention that everyone can also As you can imagine, the second is when the site is dark and you can't see the site, the situation of the hoisted object and the command signal; the third is that if the crane at the wharf breaks down, it must not carry out the lifting work, and the absolute risk factor is more than 80%; the fourth is that there are people staying within the lifting work scope, and the code can't be carried out before the personnel clear it in time The head crane works.