Crane structure: crane includes hoisting mechanism, traveling mechanism, luffing mechanism, slewing mechanism and metal structure. Hoisting mechanism is the basic working body of the crane, 250 tons crane, mostly by hanging system and winch composition, but also lift weights through the hydraulic system. Operation mechanism for horizontal transport of heavy or longitudinal adjustment of the position of the crane work, buy 250 tons crane, usually consists of motor, reducer, brake and wheel components. Crane General Knowledge: Risk Control. The case of non-crane drivers and poor health drink induction induction, Tadano 250 tons crane price, to prevent poor health, resulting in the lifting injuries. When the crane driver's job to focus on energy, we are not allowed to eat snacks, received a cell phone, chatting, smoking and other behaviors interfere with the lifting operation to prevent distracted, causing the lifting injuries.