Overhead crane

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A upper crane , commonly called crane bridge , is a kind of crane found in industrial environments. The overhead crane consists of a parallel runway with a travel bridge covering the gap. Hoist, crane lifter component, walks along the bridge. If the bridge is rigidly supported on two or more legs running on a fixed rail on the ground surface, the crane is called a gantry crane (AS, ASME series B30) or a goliath crane > (UK, BS 466).

Unlike cellular cranes or construction, the above cranes are typically used for manufacturing or maintenance applications, where efficiency or stop time is an important factor.

Video Overhead crane

History

In 1876 Sampson Moore in England designed and supplied the first ever electric crane, used for arms at Royal Arsenal in Woolwich, London. Since then, the Alliance Machine, now dead, holds an AISE quote for one of the earliest cranes in the US market. This crane operated until about 1980, and is now in a museum in Birmingham, Alabama. Over the years important innovations, such as the Weston (now rare) brake load and the hoist (still popular) wire rope, have come and gone. The original hoist contains components that are mated together in what is now called a built-in hoist. The built hoists are used for heavy duty applications such as handling steel coils and for users who want better longevity and endurance. They also provide easier maintenance. Now many hoists pack hoists, built as one unit in a single housing, are generally designed for a life of ten years, but life calculations are based on industry standards when calculating real life. See the Hoists Manufacturers Institute website for real life calculations based on load and hours used. In the modern world today for the North American market there are some governing bodies for the industry. The Overhead Alliance is a group representing the American Association of Cranes Manufacturers (HMA), the Hoist Manufacturers Institute (HMI), and the Monorail Manufacturers Association (MMA). The product advisor of the American Material Handling Industry has joined forces to create promotional materials to raise awareness of the benefits of lifting overheads. Members of this group are the marketing representatives of member companies.

Initialization

• 1830: First Crane Company in Germany Ludwig Stuckenholz company.
• 1840: mass production of overhead cranes begins in Germany
• 1854: Sampson Moore & amp; Co in Liverpool UK patented a new winch mechanism that allows for heavier weights (like naval weapons) by electric motors.
• 1861: first steam-powered overhead crane mounted by John Ramsbottom at the Crewe Railway workshop. The power is transmitted to a crane from a pulley that is driven by a stationary engine through an endless cotton rope.
• 1887: Ludwig Stuckenholz company introduces electrical components to the above crane to determine industrial design.
• 1910: First mass-produced electric motor hoist starts in Germany.

Configuration:

When sharing the main components, overhead cranes are produced in a number of configurations based on the application.

Overhead rotary cuttings

This type of overhead crane has one end of the bridge mounted on the fixed pivot and the other end is run on a circular track; bridge across the circular area beneath it. It offers improvements through jib cranes by allowing longer range and eliminating lateral strain on the building's walls.

Maps Overhead crane

Apps

Overhead cranes are commonly used in constriction of steel and other metals such as copper and aluminum. At every step of the manufacturing process, until leaving the factory as a finished product, the metal is handled by the upper crane. The raw material is poured into the furnace by a crane, the hot metal is then rolled down to a certain thickness and forged or annealed, and then stored by an overhead crane for cooling, the finished rolls are lifted and loaded onto the truck and rail by the crane above, and the fabricator or the stamper uses an overhead crane to handle the steel in its factory. The car industry uses an overhead crane to handle raw materials. Smaller workstation cranes, such as jib cranes or crane gantry, handle lighter loads in work areas, such as CNC mills or chainsaws.

Almost all paper mills use a bridge crane for routine maintenance that requires the lifting of heavy roll reels and other equipment. The bridge cranes are used in the early construction of paper machines because they are easier to install heavy iron cast iron drum dryers and other large equipment, some weighing 70 tons.

In many instances, the cost of a bridge crane can largely be offset by savings from not renting a moving crane in the construction of facilities that use a lot of heavy-duty equipment.

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Gallery

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See also

• Container crane
• Crane (train)
• Gantry crane
• EOT crane

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References

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Standard

• ASME B30.2: "Overhead and Gantry Cranes (Top Running Bridge, Single or Multiple Girder, Top Running Trolley Hoist)"
• ASME B30.17: "Overhead and Gantry Cranes (Top Running Bridge, Single Girder, Underhung Hoist)"
• ASME B30.11: "Monorails and Underhung Crane"
• BS 466: "Specification for power-driven overhead drive cranes, semi-goliaths and goliath cranes for general use" (1984)
• ISO 4301-5: "Crane: classification; part 5: travel overhead and portal bridge crane" (1991)
• ISO 8686-5: "Crane: design principles for load and load combinations; part 5: travel overhead and portal bridge cranes" (1992)
• Indian Standard - 807
• Indian Standard - 3177
• Indian Standard -4137

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External links

• OSHA Regs for crane overhead

Source of the article : Wikipedia