Overhead cranes are the main lifting equipment production halls, indoor and outdoor warehouses. The lifting elements can be represented by hooks, grabs, magnets (bridge cranes, general purpose, grips and other special devices. Cranes, designed to serve the metallurgical plants form a separate group of metallurgical cranes.
Carrying capacity of bridge cranes typically varies in the range of up to 500 tons, spans – 60 m, height – 50 m, while special versions allow working with 600m range (mine cranes). The cabin is located on the bridge crane in the area providing the best view and the safety of the crane, and if necessary – the trolley has the ability to autonomously move along the span of the crane. Valve with the movement speed of 1 m/s can be controlled from the ground.
Remote control functionality is used especially in the presence of the three mechanisms. If rarely used, light-duty cranes are primarily meant, manual transmission devices are taken advantage of. Trucks, and sometimes bridges (explosives) may have a current lead in the form of flexible suspension cable on mobile support.
On the bridge crane can be located two trolleys driving in one or two ways. In case of limited dimensions of the crane height trolley can move inside the bridge. For offloading beyond the span of the crane a truck with a swing arm or cantilever truss can be used. In the circular building cranes move on circular paths of different radii (cranes ring, chordates et al.).
Bridges crane with trolley perform double-girder (leaf and truss) or single-beam, and with manual or electric hoist – one beam (beam cranes). Hoisting crane hook includes a single drum (with heavy-duty two-and chetyrehbarabannuyu) winch with double pulley block and the location of the drum is usually across the bridge. To support operations (including acceleration lifting light loads) the second lifting mechanism is used.
When attaching the hook on a special traverse it can be installed on a rotating mechanism hook. Hoisting can be placed on the rotating frame with drive wheels (rotating trolley). If necessary, the swing of cargo is removed (mainly for metallurgical cranes and stacker cranes) and a stiffer suspension load on the lifting column with guide rods is used.
Bridges movement mechanisms operate with separate drives (one on each side of the bridge), small spans ones are packed with central drive. At high power drive-duty cranes (eg, steel) provide for two mechanisms of movement on each half of the bridge. The mechanisms of movement trolleys similar to the mechanism of movement bridges. Driving wheel in high-load cranes are reinforced with horizontal guide rollers. In the four-wheel drive mechanisms two wheels are typically installed.
Granada Material Handling, one of the most successful UK overhead cranes and gantry hoist manufacturers, is now expanding its sphere of services to serve the abroad markets. The company has managed to increased its capitalization by 38% since 2012 and now is fairly wearing the status of one of the most innovative companies, which is confirmed by reliability and functionality of the crafted products.