A mobile crane is a cable-controlledcrane mounted on crawlers or rubber-tired carriers or a hydraulic-powered crane with a telescoping boom mounted on truck-type carriers or as self-propelled models.[1] They are designed to easily transport[2] to a site and use with different types of load and cargo with little or no setup or assembly.
AAR Type "E" coupler serving as a tow hitch on a mobile crane. Pulling up on the link at the rear releases the knuckle allowing uncoupling.
Mobile cranes generally operate a boom, from the end of which a hook is suspended by wire rope and sheaves. The wire ropes are operated by whatever prime movers the designers have available, operating through a variety of transmissions. Steam engines, electric motors, and internal combustion engines (IC) have all been used.[citation needed] Older cranes' transmissions tended to be clutches. This was later modified when using IC engines to match the steam engines' "max torque at zero speed" characteristic by the addition of a hydrokinetic element, culminating in controlled torque converters. The operational advantages of this arrangement can now be achieved by electronic control of hydrostatic drives, which for size and other considerations is becoming standard. Some examples of this type of crane can be converted to a demolition crane by adding a demolition ball, or to an earthmover by adding a clamshell bucket or a dragline and scoop, although design details can limit their effectiveness.
Before 1870 cranes were fixed to a position, except for some mounted on flatcars, railroad cranes, which provided some restricted movement. Appleby Brothers demonstrated steam-powered cranes at Paris in 1867 and Vienna in 1873. In 1922, Henry Coles, manager of Appleby Corp., began producing truck-mounted cranes under the name Petrol Electric Lorry Crane. In 1939 the Coles were acquired by Steel and Co. Ltd. of Sunderland. Hiab invented the world's first hydraulic truck mounted crane in 1947.[3] The name, Hiab, comes from the commonly used abbreviation of Hydrauliska Industri AB, a company founded in Hudiksvall, Sweden in 1944 by Eric Sundin, a ski manufacturer who saw a way to utilize a truck's engine to power loader cranes through the use of hydraulics.
Major crane development events include adoption of the internal combustion engine in 1922 and the invention of telescopic jibs. Before 1960, cranes carried additional booms with them to increase height, which increased operating costs. In 1959 crane expert R.H.Neal, hydraulics specialist F.Taylor, and design director Bob Lester, integrated all three and modernized cranes. The Coles Hydra Speedcrane appeared in 1962, further modified with the 10-ton fully telescopic hydraulic boom in 1966, followed in 1968 by the 30-ton "Husky" military versions with four-wheel drive. In 1972, Steels was forced to merge with the Acrow Group, losing some of their most valuable employees, including Don Hassel and Johnny Johnson who started a new manufacturing processes plant. With backing from the British Crane Hire Corporation they acquired a small factory unit and ordered every single element of their product from subcontracted suppliers. In 1976, the Cosmos team created a 25-ton crane that combined several new developments.[4]
A Liebherr heavy Crane LR 11350 lifted a dome of nuclear power plant with 281 Tonnes 62 Meter high in December 2023.[5]
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January 01, 1970
mobile, crane, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, january, 201. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Mobile crane news newspapers books scholar JSTOR January 2011 Learn how and when to remove this message The examples and perspective in this article deal primarily with the United Kingdom and do not represent a worldwide view of the subject You may improve this article discuss the issue on the talk page or create a new article as appropriate August 2011 Learn how and when to remove this message A mobile crane is a cable controlled crane mounted on crawlers or rubber tired carriers or a hydraulic powered crane with a telescoping boom mounted on truck type carriers or as self propelled models 1 They are designed to easily transport 2 to a site and use with different types of load and cargo with little or no setup or assembly A Liebherr LTM 1200 5 1 Crane Contents 1 Overview 2 History 3 Types 4 Gallery 5 References 6 External linksOverview edit nbsp AAR Type E coupler serving as a tow hitch on a mobile crane Pulling up on the link at the rear releases the knuckle allowing uncoupling Mobile cranes generally operate a boom from the end of which a hook is suspended by wire rope and sheaves The wire ropes are operated by whatever prime movers the designers have available operating through a variety of transmissions Steam engines electric motors and internal combustion engines IC have all been used citation needed Older cranes transmissions tended to be clutches This was later modified when using IC engines to match the steam engines max torque at zero speed characteristic by the addition of a hydrokinetic element culminating in controlled torque converters The operational advantages of this arrangement can now be achieved by electronic control of hydrostatic drives which for size and other considerations is becoming standard Some examples of this type of crane can be converted to a demolition crane by adding a demolition ball or to an earthmover by adding a clamshell bucket or a dragline and scoop although design details can limit their effectiveness History edit nbsp Truck mounted crane at bridge constructing Before 1870 cranes were fixed to a position except for some mounted on flatcars railroad cranes which provided some restricted movement Appleby Brothers demonstrated steam powered cranes at Paris in 1867 and Vienna in 1873 In 1922 Henry Coles manager of Appleby Corp began producing truck mounted cranes under the name Petrol Electric Lorry Crane In 1939 the Coles were acquired by Steel and Co Ltd of Sunderland Hiab invented the world s first hydraulic truck mounted crane in 1947 3 The name Hiab comes from the commonly used abbreviation of Hydrauliska Industri AB a company founded in Hudiksvall Sweden in 1944 by Eric Sundin a ski manufacturer who saw a way to utilize a truck s engine to power loader cranes through the use of hydraulics Major crane development events include adoption of the internal combustion engine in 1922 and the invention of telescopic jibs Before 1960 cranes carried additional booms with them to increase height which increased operating costs In 1959 crane expert R H Neal hydraulics specialist F Taylor and design director Bob Lester integrated all three and modernized cranes The Coles Hydra Speedcrane appeared in 1962 further modified with the 10 ton fully telescopic hydraulic boom in 1966 followed in 1968 by the 30 ton Husky military versions with four wheel drive In 1972 Steels was forced to merge with the Acrow Group losing some of their most valuable employees including Don Hassel and Johnny Johnson who started a new manufacturing processes plant With backing from the British Crane Hire Corporation they acquired a small factory unit and ordered every single element of their product from subcontracted suppliers In 1976 the Cosmos team created a 25 ton crane that combined several new developments 4 A Liebherr heavy Crane LR 11350 lifted a dome of nuclear power plant with 281 Tonnes 62 Meter high in December 2023 5 Types editMain article Types of mobile cranesGallery edit nbsp A 130t mobile crane nbsp Demag AC1000 a 1000 ton mobile crane nbsp Liebherr mobile crane 450T Brisbane nbsp Maeder Kriessern Rhine Liebherr LR 11000 32ASDReferences edit McGraw Hill Dictionary of Scientific amp Technical Terms McGraw Hill 1999 Mobile Crane Hire Ireland Kevin Keogh Crane Services www kkeoghcraneservices ie Retrieved 2018 11 14 History Sunfab Gizaw Abenezer MOBILE CRANES a href Template Cite journal html title Template Cite journal cite journal a Cite journal requires journal help https world nuclear news org Articles Kudankulam unit 3 reactor building dome installed text The 20expected 20completion 20dates 20for 20Kudankulam 203 20and 204 20are 20in 202023 External links edit nbsp Wikimedia Commons has media related to Mobile cranes Retrieved from https en wikipedia org w index php title Mobile crane amp oldid 1207480378, wikipedia, wiki, book, books, library,
