overhead gantry crane presentation and composition

a large cranes overhead gantry crane, the structure of beams and columns was "door" shape, deliberate move on the track, starting with a larger weight. Currently shipyards,Bridge crane container yard cranes and divided into two types, namely, rail-mounted container cranes (RMG) and rubber-tyred cranes (RTG). overhead gantry crane rail-mounted container cranes that, Overhead bridge crane with energy saving, high reliability, lifting capacity, small maintenance workload, easy to automate operation. But its biggest drawback is inconvenient to shift position.
overhead gantry crane is mainly composed of cylindrical wheels, bumper, brake blocks, wire rope, lifting hooks, cab, reducer,rail mounted gantry crane pulley casting, casting reel, electric motors, electronic control equipment consists of the following components.
After rotating overhead gantry crane hook, wire rope hook on the kink together, this time can no longer be landing hook operation, or they may make one of the Rope damaged by excessive force, you can take the following approach:
   (1) Under heavy ground is not high and the performance permit crane, gantry crane with luffing methods can put weight down, crane hoist then put a positive spin hook.
   (2) If the weight has been lifted high off the ground, you can only think of a way close to the surrounding buildings, or other person gantry crane hanging cage to spin positive hook.
   (3) In the event the hook rotated, the rope should be released within the gantry torque, the specific method is: Bridge crane to hook into the ground and untied the rope fixed end, in accordance with the rotation of the hook m multiplied by the number of turns of wire rope n is the number of matches cardinality k (as the case may increase or decrease), shares in the reverse direction by rope twist, turn the end of the rope to release torque, and then install the fixed end. Boom will play a maximum elevation of lifting machinery, repeated several times to check the effect of hook ups and downs, you can repeat the above steps until the hook is stable.