|"As we see in the many industries that the movement of heavy equipment or metals sheet is very tedious task and a huge labours and a lot of time is required to move from one place to desire place. So it’s complicated, uneconomical and also risky .To overcome this problem a machine is used which is called CRANE. Crane is a mechanical device in which lever, pulley, rope, hook & engine are used like as hydraulic crane, electromagnetic crane etc. By the help of crane we can move heavy metals (mainly metal sheet) from one place to another place very easily, it reduce working time, force and money. it can be operated by a single person so its reduce the need of labours.
An electromagnetic crane is a type of crane in which we are using an electromagnet (which is made up of soft iron core and a copper wire is wounded around its periphery) to lift the heavy metal (made up of ferrous metal) and thus the work piece is lifted and keep in desired place by electromagnetic crane.
MECHANISM OF ELECTROMAGNETIC CRANE
The magnetic strength of an electromagnet depends on the number of turns or wire and the current through the wire, and the size of the iron core. This allows electromagnets to be made much larger and stronger than a natural magnet, such that they can pick up very large objects. Also, when you turn off the electricity to an electromagnet, the magnetism is also turned off. Thus, an electromagnet can be used to pick up a piece of iron and then drop it some place else.
History of crane
The first construction cranes were invented by the Ancient Greeks and were powered by men or beasts of burden, such as donkeys. Larger cranes were later developed, employing the use of human tread wheels, permitting the lifting of heavier weights. Use of crane Cranes are commonly employed in the transport industry for the loading and unloading of freight, in the construction industry for the movement of materials and in the manufacturing industry for the assembling of heavy equipment. The first construction cranes were invented by the Ancient Greeks and were powered by men or beasts of burden, such as donkeys. These cranes were used for the construction of tall buildings. Larger cranes were later developed, employing the use of human treadwheels, permitting the lifting of heavier weights.
Evolution of crane
The earliest cranes were constructed from wood, but cast iron and steel took over with the coming of the Industrial Revolution. For many centuries, power was supplied by the physical exertion of men or animals, although hoists in watermills and windmills could be driven by the harnessed natural power. The first 'mechanical' power was provided by steam engines, the earliest steamcrane being introduced in the 18th or 19th century, with many remaining in use well into the late 20th century. Mini - cranes are also used for constructing high buildings, in order to facilitate constructions by reaching tight spaces. Finally, we can find larger floating cranes, generally used to build oil rigs and salvage sunken ships. we can find larger floating cranes, generally used to build oil rigs and salvage sunken ships. The article also covers lifting machines that do not strictly fit the above definition of a crane, but are generally known as cranes, such as stacker cranes and loader cranes. There are used motors to move the craned."