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Bridge cranes or also called overhead cranes are a type of industrial material handling crane utilizing a hook and line mechanism that runs on a horizontal beam running along two widely separated rails. Various overhead cranes can be found in a long factory structure and they can run along the building's two long walls, like a gantry crane.
Usually, overhead cranes consist of either a double beam or single beam construction. These can be built by making use of either typical steel beams or a more complex girder style. The single bridge box girder crane is complete along with the system and the hoist and is operated using a control pendant. When the application requires heavier capacity systems for ten tons or more, double girder bridge cranes are often used.
With the girder box configuration, one major advantage is the lower deadweight with a stronger integrity of the overall system. One more advantage would be the hoist to lift the objects and the bridge which spans the area covered by the crane, along with a trolley to move along the bridge.
The overhead crane is most commonly utilized within the steel business. Steel is dealt with by an overhead crane at each stage of the manufacturing procedure until it leaves a factory as a finished product. The crane is likewise 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 trucks and trains making use of overhead crane. The fabricator or stamper also depends on overhead cranes in order to deal with steel in the factory.
Overhead cranes are normally used in the automobile business for the dealing with raw material. There are smaller workstation cranes that are utilized to deal with lighter loads within work areas like in CNC shops and sawmills.
In nearly all paper mills, bridge cranes could be found being utilized for regular repairs requiring the removal of heavy press rolls and several machines. Some of the cast iron paper drying drums as well as other pieces of specialized equipment weigh as much as 70 tons. The bridge cranes are actually utilized in the preliminary construction of the paper machines to be able to facilitate installation of these extremely heavy items.
The cost of a bridge crane can be largely offset in various cases with savings incurred from not renting mobile cranes when a facility is being made which uses plenty of heavy process machinery.
The Rotary Overhead crane has one end of the bridge attached on a fixed pivot and the other end carried on an annular track. The bridge traverses the circular area below. Rotary Overhead cranes provide 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 particular crane was utilized in service until around 1980 and has been retired into a museum in Birmingham, Maine.
Ever since the early days, several innovations have come and gone, for instance, the Weston load brake is at present considered rare, while the wire rope hoist is still common. In the beginning, the hoist contained parts 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 instance. They are likewise popular for users who want better quality and long life from their piece of equipment. These built up hoists likewise provide for easier upkeep.
Now, lots of hoists are package hoists. This means they are built as one unit in a single housing that is usually designed for ten years of life. This particular calculation is based on an industry standard wear and tear when calculating actual life.
In the current North American Material Handling Industry, there are some governing bodies for the industry. The Overhead Alliance is a group that represents CMAA, or otherwise known as Crane Manufacturers Association of America, HMI or Hoist Manufacturers Institute and MMA or also known as Monorail Manufacturers Association. The members of this particular organization are marketing representatives of the member companies and these product counsels have joined forces to create marketing materials to be able to raise the awareness of the benefits to overhead lifting.
