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The Origins of Crane Development
In 10 BC, the ancient Roman architect Vitruvius described in his architectural handbook a Crane Machines of this type feature a mast topped with a pulley. The mast’s position is secured by cables, which pass through the pulley and are hauled by a winch to lift heavy loads. For exceptionally heavy machinery, two masts can be arranged in a braced, A-frame configuration to enable lateral movement of the lifted load—though the range of motion is very limited, and the operation is highly challenging.
In the 15th century, Italy invented the jib crane to address this problem. This type of crane features an inclined boom with a pivoting base and a pulley block at the top, enabling it to lift and rotate loads. However, until the 18th century, all cranes in use were powered by human or animal labor, which severely limited their lifting capacity, range of application, and operational efficiency.
In the mid-to-late 18th century, British engineer James Watt improved and invented the steam engine, providing the power source for crane machinery. In 1805, engineer George Rennie built a fleet of steam-powered cranes for the London docks. In 1846, William Armstrong of Britain converted a steam crane at the Newcastle-upon-Tyne docks into a hydraulic crane.
At the beginning of the 20th century, cranes began to be used in Europe.
Cranes primarily consist of lifting mechanisms, traveling mechanisms, luffing mechanisms, slewing mechanisms, and metal structures. The lifting mechanism is the crane’s fundamental working unit, typically comprising a suspension system and a winch; some cranes also employ hydraulic systems for lifting heavy loads. The operating mechanism is used to move loads vertically and horizontally or to adjust the crane’s working position, generally consisting of an electric motor, a reducer, a brake, and wheels. The luffing mechanism is exclusively fitted on cranes with boom-type booms: during lifting, the boom’s radius decreases, while during lowering, the radius increases. Luffing can be either balanced or unbalanced. The slewing mechanism is responsible for rotating the boom and comprises a drive unit and a slewing bearing assembly. The metal structure serves as the crane’s skeletal framework; the main load-bearing components—such as the bridge, boom, and gantry—are often constructed as box-section or truss structures, or as web-plate structures, with some parts supported by structural steel sections.
Keywords:
Crane
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