Double girder crane generally refers to double girder bridge crane, English name: Dual-beam Crane. Double-girder cranes are generally composed of three major parts: mechanical, electrical and metal structures. The appearance of the bridge crane is like a single-span flat bridge whose two ends are supported on two parallel overhead rails and run in translation. Double-girder cranes are widely used in indoor and outdoor industrial and mining enterprises, iron and steel chemical industry, railway transportation, port terminals and logistics turnover and other departments and places.
Safety inspection of double-girder cranes In order to ensure the safe operation of bridge cranes, some safety routine inspections are required during the operation of the crane. The inspection items and main points are as follows:
(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, and 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. There is no crack in the drum, 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.
Through the safety routine inspection of double-girder cranes, it has played a significant role in eliminating personal accidents, reducing equipment accidents, improving equipment operation rate, and reducing maintenance costs.