bridge crane and metallurgical dedicated three. Aka crane, driving.

Bridge crane bridge crane can be divided into ordinary, simple beam bridge crane bridge crane and metallurgical dedicated three. Aka crane, driving.

General overhead cranes generally Scissor lift trolley bridge operating agencies, bridge metal structures. Lifting trolley and the hoisting mechanism, trolley run institutions and small frame of three parts.

Lifting mechanism includes a motor, brake, reducer, drum and pulley. Motor through reducer, driving drum rotation, so that the wire rope around the drum or from a roll down to lift heavy loads. Small frame and mounting bracket is lifting mechanism and trolley run institutions and other parts of the rack, usually welded structure.

Crane drive mechanism can be divided into two categories: one for the central drive, which uses an electric motor to drive long shaft-driven initiatives on both sides of the wheel; another is separately driven, that is active on both sides of each wheel with a single motor. Medium and small bridge cranes more use brakes, gear units and motors combined into one "triple play" drive mode, a large common bridge crane lifting weight for electric stacker of installation and adjustment, universal coupling drive device often used .

Crane agencies generally only four driving and driven wheels, if the starting weight is large, common approaches to reduce the wheel increases wheel pressure. When more than four wheels, a frame must be balanced hinge device, the crane load is evenly distributed on each wheel.

The metal structure of the bridge from the main beam and side beams, divided into single girder and double girder bridge bridge categories. Single girder bridge by a single span girders and located on both sides of the end beam composed of two dual-beam bridge girders and by the end beam components