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Bridge cranes or also called overhead cranes are a type of industrial material handling crane making use of a line and hook mechanism which runs on a horizontal beam running along two widely separated rails. Numerous overhead cranes can be seen inside a long factory building and they may run along the building's two long walls, similar to a gantry crane.
Overhead cranes typically include either one beam or a double beam construction. These are built from normal steel beams or more complex girders. The single bridge box girder crane is complete together with the hoist and the system and is operated with a control pendant. Whenever the application requires heavier capacity systems for at least ten tons, double girder bridge cranes are more common.
With the girder box configuration, one main advantage is the stronger integrity of the overall system with lower deadweight. One more benefit would be the hoist to lift the items and the bridge that spans the area covered by the crane, together with a trolley to be able to move along the bridge.
The overhead crane is most generally utilized in the steel industry. Steel is handled by an overhead crane at every stage of the manufacturing method until it leaves a factory as a finished product. The crane is also responsible for pouring raw materials into a furnace and hot steel is then stored for cooling using an overhead crane. When the coils are finished they are loaded onto trains and trucks using overhead crane. The stamper or fabricator even depends on overhead cranes in order to handle steel within the factory.
The automobile industry usually makes use of the overhead crane to be able to deal with raw materials. There are smaller workstation cranes which are designed to handle lighter loads inside work places like for example in CNC shops and sawmills.
In almost all paper mills, bridge cranes can be seen being used for normal maintenance requiring the removal of heavy press rolls as well as various equipment. Some of the cast iron paper drying drums and other pieces of specialized machines weigh as much as seventy tons. The bridge cranes are used in the preliminary construction of the paper machinery in order to facilitate installation of these extremely heavy things.
When constructing a facility making use of lots of heavy equipment, the costs of a bridge crane can be largely offset in some circumstances with savings from not renting mobile cranes.
The Rotary Overhead crane has one end of the bridge mounted on a fixed pivot and the other end carried on an annular track. The bridge traverses the circular area underneath. Rotary Overhead cranes supply improvement more than a Jib crane by making it possible to provide a longer reach while eliminating lateral strains on the building walls.
Demag Cranes & Components Corp. was one of 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 first cranes in the United States market. This crane was utilized in service until around nineteen eighty and has been retired into a museum in Birmingham, New Jersey.
Since the early days, several innovations have come and gone, like for instance, the Weston load brake is currently considered rare, whereas the wire rope hoist is still popular. Initially, the hoist contained components mated together in what is now referred to as the built-up style hoist. These super industrial hoists are used for heavy-duty applications such as steel coil handling for example. They are likewise common for users who desire better quality and long life from their piece of equipment. These built up hoists also provide for easier repairs.
These days, 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 calculation is based on an industry standard wear and tear when calculating actual life.
In the existing North American Material Handling Business, there are several governing bodies for the industry. The Overhead Alliance is a group that represents CMAA, or Crane Manufacturers Association of America, HMI or likewise known as 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 so as to raise the awareness of the benefits to overhead lifting.
