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Hydraulic Cranes

10/18/2012 7:19:49 PM | by Anonymous


We always see these towering structures simply appearing at construction sites but most of us would have rarely seen a crane being set up at the site. Cranes are essential to construction as they are heavy-duty construction vehicles that can carry great amount of loads. The building that you are sitting in right now was most likely constructed with not one but several cranes. These heavy-duty pieces of equipment are highly efficient and can perform tasks that previously would have been deemed impossible. Hydraulic cranes, which are one of the most sophisticated and efficient equipment in the truck market, are undoubtedly an extraordinary vehicle due to their strength, agility in maneuvering as well as ability to carry extremely heavy materials.


Now, before we discuss how these cranes work, let's find out the different components that make these giants up and provide them with all that strength. Most cranes have these basic components.


The long arm that we see protruding out of the main body is known as the boom. Hydraulic cranes have a joint in the middle of the boom which allows for them to be more agile which eases movement. Booms are responsible for lifting loads. The lattice-like structure that we see attached to the end of the boom is known as the jib. This component holds any material that the crane carries. The jib can sometimes be replaced with a huge metal ball for demolition purposes. Wire ropes are the steel cables that provide the boom with power to lift loads. You might have seen that the hydraulic crane is able to rotate on its base and move in any direction. This is the doing of rotex gear. Outriggers are foot-like devices that provide the crane with balance and stability during the lifting process.


Now those are the components that make up a hydraulic crane, but you still must be wondering how the crane gets all that strength to lift heavy rocks and loads. Well, as the name suggest, it gets that power from hydraulics. In the operators cab, there are foot pedals and joysticks that control the movement of the crane. These cannot be put into action without the hydraulic system. In the boom are pipes and pistons that contain a specialized fluid. Force is applied onto the pistons at one end of the pipe and the hydraulic fluid is forced to move as it cannot be compressed. As the fluid moves, it moves the piston at the other end of the pipe along with it. The basic principal of hydraulics is that when a force is applied onto a piston with fluid on the other side, the force is multiplied greatly in the process.


All movement of the hydraulic crane is controlled in the operator's cab using foot pedals and joysticks. None of which can be put into action without the hydraulic system. This system is composed of pistons and pipes containing specialized fluid. The underlying hydraulic principle is that when significant downward force is applied to a piston and transferred through incompressible fluid to another piston, force is multiplied in the process. The size of the piston cylinders have to be manipulated to create greater force at the other end. The master cylinder has a greater surface area as compared to the slave cylinder through which the fluid is going to be pushed. This difference creates pressure thus generating greater force. Through this process, the fluid is distributed to lift and produce movement through tubes and hoses that contain the circuits and are regulated by control valves.


The control system of the crane is in the cab. The driver uses various controls such as joysticks and foot pedals in order to be able to maneuver the mechanical structure. These controls allow for movements such as retracting and extending the boom, lifting loads and movements of the crane body. These cranes were a much needed invention that has become very essential to the construction industry. They are able to perform tasks that were previously unimaginable to mankind.

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