Crane prototype

Chinese ancient irrigation is used orange jib crane prototype.
14th century, Western Europe showed a shift of human and animal-driven boom cranes.
Early 19th century, showing apallet jacks crane; crane important wear parts such as shafts, gears and spreader used metal materials such as beginning and start optional hydraulic drives.
Late 19th century, steam-driven hydraulic crane gradually replace the crane driver.
The beginning of the 1920s era, because the electrical industry and the rapid development of the internal combustion engine industry to electric motor or internal combustion engine-powered equipment of all kinds cranes fundamental composition.
Composition layout
Include lifting cranes primary organization, functioning organization, luffing organization, reverse tissue and metal layout. Lifting crane organization is a fundamental task organization, mostly by hanging system and winch components, but also through the hydraulic system lifting heavy objects. Organization to operate or adjust the level of vertical migration of heavy crane operating position, is usually caused by motor, speed reducer, brake and wheel components. Luffing jib type organization only equipped in the crane, jib looked up and downs when reduced, bent downs when increasing amplitude of balanced and unbalanced luffing two kinds. Reverse organizations use to make the boom reversed, is supported by the drive device and the reverse devices. The layout is the skeleton of metal crane, the primary carrier such as bridge, boom and mast for box-shaped layout or truss layout, but also for web layouts, and some can be used as a steel support beam.