Overhead cranes are otherwise referred to as bridge cranes. They are a kind of crane which comprises a line and hook apparatus that runs along a horizontal beam which runs along two widely separated rails. Various overhead cranes could be seen within a long factory building and they may run along the building's two long walls, like a gantry crane.
Usually, overhead cranes have either a double beam or single beam construction. These can be constructed by using either typical steel beams or a more complex girder style. The single bridge box girder crane is complete with the hoist and the system and is operated with a control pendant. If the application requires heavier capacity systems for ten tons or more, double girder bridge cranes are more common.
Amongst the main benefits of the box girder type of configuration is that it offers a lower deadweight with a stronger overall system integrity. Another advantage will be the hoist to lift the stuff and the bridge that spans the area covered by the crane, along with a trolley in order to move along the bridge.
Overhead cranes are most commonly utilized in the steel trade. The steel is dealt with utilizing this crane at every stage of the manufacturing process until the product is transported from the factory. The crane is also responsible for pouring raw materials into a furnace and hot steel is then stored for cooling utilizing an overhead crane. Once the coils are finished they are loaded onto trains and trucks utilizing overhead crane. The fabricator or stamper even relies on overhead cranes to be able to deal with steel inside the factory.
Overhead cranes are commonly used in the automobile business for the handling of raw material. There are smaller workstation cranes that are designed to deal with lighter loads inside work places like in sawmills and CNC shops.
In nearly all paper mills, bridge cranes could be seen being used for normal upkeep needing the removal of heavy press rolls as well as various equipment. Some of the cast iron paper drying drums as well as other pieces of specialized machinery weigh as heavy as 70 tons. The bridge cranes are actually used in the preliminary construction of the paper machines so as to facilitate installation of these enormously heavy objects.
The price of a bridge crane can be mostly offset in numerous cases with savings incurred from not leasing mobile cranes when a facility is being made which makes use of a lot of heavy process equipment.
The overhead Rotary crane has one of the bridge ends are mounted on a fixed pivot with the other end being carried on an annular track. The bridge is able to transverse across the circular area below. Rotary Overhead cranes offer improvement over a Jib crane by making it possible to offer a longer reach while eliminating lateral strains on the building walls.
Demag Cranes & Components Corp. was among the very first businesses to mass produce steam powered cranes. The now defunct Alliance Machines were the second company to mass produce cranes. Alliance holds an AISE citation for one of the earliest cranes in the United States market. This crane was utilized in service until around the year 1980 and has been retired into a museum in Birmingham, Alabama.
Various innovations have come and gone since the very first cranes, like for example, the Weston load brake is at present practically obsolete, while the wire rope hoist is still common. The wire rope hoist was at first hoisted to contain components mated together to form a built-up style hoist. These super industrial hoists are utilized for heavy-duty applications such as steel coil handling for instance. They are also popular for users who desire better quality and long life from their piece of equipment. These built up hoists even provide for easier maintenance.
Today, nearly all hoist are package hoists meaning that they are made into one unit in a single housing. These hoists are usually designed for ten years of life. This particular estimate is based on an industry standard wear and tear when calculating actual life.
In the existing North American Material Handling Industry, there are a few governing bodies for the business. The Overhead Alliance is a group which represents CMAA, or also known as Crane Manufacturers Association of America, HMI or Hoist Manufacturers Institute and MMA or otherwise known as Monorail Manufacturers Association. The members of this particular group are marketing representatives of the member companies and these product counsels have joined forces to make promotional materials in order to raise the awareness of the advantages to overhead lifting.