QD electric double-girder bridge crane with hook is the widely used hoisting machinery currently. It is mainly comprised of box-shape bridge, crane crab, trolley travelling mechanism and electric control system. The load handling device is the hook.On the girder laid rails for crane crab to transversely move.The girder is weld with the box-shaped end girder. At the middle of the end girder are joints which are fastened with bolts for fragmented transportation of bridges. The platform is used to place trolley travelling mechanism, electric equipment and used for repair.It has three operation modes: ground handle, wireless remote control and cab. There are two kinds of cab: open cab and closed cab, where there are adjustable seat, insulating mat on the floor, toughened glass for the window, fire extinguisher, electric fan and auxiliary equipment such as air conditioner, acoustic alarm and
interphone which can be furnished as required by users.The crane can be furnished with load handling devices such asmotor grab, electromagnetic chuck to meet the requirements of hoisting varied types of materiats.
The crane, of a classification group of A3~A7, has a commonly used lifting load of 3-250t, so that it is suitable to work in factories, warehouses and freight yards where the ambient temperature is-10℃~40°C and the relative humidity is not more than 85%. It is prohibited to work in the environment with inflammable, explosive
and corrosive gas.