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Common Crane Parts

7/1/2013 12:59:21 PM | by Anonymous

Crane Parts

Crane parts are mechanical components of a crane where there is clearly a mechanism with moving parts. A crane is a form of machine which is usually equipped with a hoist, chains or wire ropes and sheaves which can be used to both lift and lower materials and to move them horizontally. A crane’s main function is to lift things that are heavy in weight and move them to other places.


There are important considerations to be made when designing cranes. Firstly the crane must be able to lift the weight of the load. Then, the crane must not topple. Last but not least, the crane must not be able to rupture. The first aspect, of lifting the crane’s load, there are simple machines which cranes use in order to work. A simple machine is known as a simple mechanism that provides leverage.


The first simple machine is a lever. A balance crane would contain a horizontal beam, also known as the lever, pivoted about a point, known as a fulcrum. The principle of the lever allows a heavy load that is attached to the shorter edge of the beam to be carried by a smaller force which is applied in the opposite direction, toward the longer side of the beam. The ratio to the weight of the load to the applied force is the same to the ratio of the lengths to the longer and shorter arm and is referred to as the mechanical advantage.


The pulley is another simple machine. A jib crane would contain a tilted strut which would support a fixed pulley block. Cables are wrapped several times around the fixed block and round another block which is fastened a load. When the free end of the cable is pulled by a winding machine or by a hand, the pulley system delivers a force to the load that is identical to the force applied multiplied by the number of lengths of cable passing between the two blocks. The number is referred to as the mechanical advantage.


The hydraulic cylinder is used directly to lift the load or to indirectly move the beam or jib that carries another lifting device. Cranes obey the principles of conservation of energy. This refers to the energy that delivers to the load is not able to exceed energy inserted into the machine. For instance, if the pulley system multiplies the force applied by ten, the load then moves only a tenth as far as the applied force.


The most recognizable crane part is the boom. The boom is the steel arm of the crane which has a grasp on the load. Rising up from just behind the operator’s cab, the boom makes an important part of the crane as it allows the machine to raise loads to heights of several dozen feet.


Most truck cranes come with a boom that is equipped with several telescoping sections. For example, a 70-ton Link-Belt hydraulic truck crane has a boom equipped with three telescoping sections. This boom in particular comes with a length of 38.7 meters (127 feet). Some booms come with a jib which is the lattice structure attached to the end of the boom. Another crane part, known as Reinforced-steel cable lines, run from a winch which is found behind the operator’s cab, extends up and over to the jib and boom.


In order to move the load, the boom must be able to move in various directions. Underneath the operator’s cab, you can find a Rotex gear on a turntable bearing that turns at 2 revolutions per minute. It is driven by a hydraulic and bidirectional motor which is mounted on the cab and housed in a metallic cover in order to prevent injuries. It is important that cranes be completely stable when lifting loads. An essential crane part, known as outriggers, serves as balances to keep the cranes from leaning too much to one side.

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