What are the safety inspection specifications for double girder cranes?

Double-girder cranes are used in many chemical plants, steel plants, etc., and before use, double-girder cranes have a safety inspection, which can ensure the effect of use. So what are the safety inspection specifications for double girder cranes?

 Double-girder bridge cranes have single and double speeds for hoisting and operation of large and small vehicles. The control methods are divided into two types: ground control and control room control. Ground control is divided into wired control and wireless remote control. The control room is separated and closed. There are two types. The entrance direction of the operation room is divided into four situations: left end, left end, right end and right end, which are determined by the user according to the direction of the workshop ladder platform.

 (1) The lifting height limiter, travel limit switch and each interlocking mechanism have normal performance and are safe and reliable.

 (2) All main components meet the safety requirements: the opening increase is less than 15% of the original size, the torsional deformation is less than 10%; the wear of the hook bushing is less than 50% of the original size, the wear of the hook mandrel is less than 5%, and there is no peeling , burr, welding repair. The hook hanger and pulley have no obvious defects. The steel wire wear and corrosion on the surface of the steel wire rope are less than 40% of the diameter of the steel wire, and the broken wire is less than 10% of the total number of wires within a lay length. , annealing, burning phenomenon. 

The end of the wire rope is connected and fixed with clips, pressure plates and wedges that are well connected and not loose. There should be no less than 2 pressure plates and no less than 3 clips. The drum has no cracks, and there is no loose connection and fixation; the wear of the drum wall is less than 20% of the original wall thickness; the safety roll is not less than 2 turns, and the ratio of the diameter of the drum to the wire rope meets the requirements. The balance wheel is well fixed, and the wire rope should meet the requirements. The brake has no cracks, no looseness, no serious wear, equal size and suitable size on both sides of the brake gap, sufficient braking force, and the wear of the brake band is less than 50% of the original thickness.

Inspection of double-girder cranes before use can reduce many accidents in use and greatly improve work efficiency, so I hope everyone can test according to the above specifications.