Crane
It is a type of transport device that is equipped with a lifting rope, wire rope or chain.
A crane is used to lift and lower materials, move materials horizontally, lift heavy equipment and transport.
Cranes are used in the transportation industry to load and unload cargo, in the construction industry to move materials, and in manufacturing industries to assemble heavy equipment.
History of the use of crane
The first known crane device was the Shadov, a device for lifting water that was invented in ancient Mesopotamia (modern Iraq) and then appeared in ancient Egyptian technology.
Construction cranes were produced in ancient Greece. , where they were powered by men or animals (such as horses, cows) and were used to construct buildings.
Larger cranes were later developed in the Roman Empire, which used human treadmills. , were able to lift heavier weights.
In the middle of the century, cranes made of cast iron, steel and zinc were produced.
Different types of cranes
Over-the-road crane
The over-the-road crane is designed for on-road and off-road transportation. Cranes are single-engine devices. Most of them have 4-wheel drive and 4-wheel steering designed to pass through tighter and softer terrain. Crawler crane
The crawler crane is installed under the ship with a set of crawler tracks that provide stability and mobility.
Crawler cranes in lifting capacity from 40 to 4000 tons.
A crawler crane is also capable of traveling with loads.
This type of crane is also used for carrying on muddy or uneven roads.
Floating cranes
They are mostly used in bridge construction and port construction, but they are used for loading and unloading heavy or large loads in The ship is also used.
Some floating cranes are mounted on pontoons, others have special loads for cranes with a lifting capacity of more than 10,000 tons, and they are used for carrying and It is used to move the whole parts of the bridge. Tower cranes are often used in the best form of height and capacity. Lifting are placed on the ground and are located on the ground and are used in the construction of tall buildings.
Overhead crane
It is used in stores or iron markets.
Overhead crane, also known as bridge crane, is a type of crane that is widely separated along two rails and capable of is to lift and move the weight of 5 to 6 tons.