Monday 25 March 2013

Know more about crane controls!

To lower and lift materials with the use of pulleys and cable, a crane, which is equipped with a derrick or tower, is used. In various activities connected with their process, heavy equipment manufacturers and the construction industry use cranes.

Built for the specific purpose of carrying the crane, or fixed to the ground, cranes used in the construction industry are mostly temporary structures either mounted on a vehicle. Using a push button pendant or by an operator sitting in the cab of the vehicle, cranes may be controlled by various methods of crane controls such as radio control, infrared control or a built in control station.

Between the person operating the controls and the workers in the ground, a standardized hand signal is used. For this purpose, bigger installations use radio communication. By experienced crew of the crane, loads can be positioned with great precision using such signals. The largest revolving cranes, crane vessels or ships often carry. Depicting a monument being built with a sort of crane, it is a surprise to note from the carved stone relief in Haterii’s tomb of 1st century Rome, that in medieval shipyards and ports in Poland, cranes were used.

Railroad cranes, mobile cranes, telescopic cranes, tower cranes, truck-mounted cranes, rough terrain cranes, crawler cranes, loader cranes, floating cranes, gantry cranes and aerial cranes are the various types of cranes in common use.

Known as railroad crane, it is a crane mounted on a railroad car or on a flatcar. As the name implies, can be carried easily to any place, mobile cranes are the most basic and common type of crane. Fixed to the ground are tower cranes. For the best combination of lifting capacity and height, these are mostly used in buildings. Reaching greater heights, a telescopic crane is capable of lifting lower capacity.

A crane will be mounted on a carrier truck, to provide greater mobility, and is known as a truck-mounted crane. Capable of pick and carry operations in rough terrain, whereas the rough terrain cranes, which are mounted on four rubber tires. Having better stability and mobility, crawler cranes are mounted on a set of tracks with an undercarriage.

Capable of carrying very heavy loads, a suspended crane or overhead crane is used mostly inside factories. A stacker crane with a forklift is used, in automated and computer controlled warehouses. Floating cranes are used, during bridge or port construction. Floating cranes are ideal, to load or offload awkward or heavy machinery. In offshore work, they are also used. Aerial cranes are used to lift large loads, which are extended from helicopters.

Based on two major considerations is the design of cranes. To lift specified mass is first, its stability is the second, and while performing lifting operations, it should not topple over.

before using the crane, ensure that the Crane controls is in place.

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