A lifting crane is a machine that is used to lift and move heavy objects. The main function is to help move equipment and materials up high places where workers can access them. This helps avoid the need for workers to carry loads up scaffolding or other structures, which can be dangerous. Cranes come in many different sizes and types, with varying weight capacities and capabilities. They are generally operated from an operator cab in the cab of the crane, by using a control pendant or radio/IR remote pendant, or from a control panel on the ground.

The Importance of Proper Maintenance for Lifting Cranes

The main components of a lifting crane are the boom, jib, machinery arm, and counterweights. The boom is the long, horizontal arm of the crane that moves the load. It can be fixed or telescopic, meaning it can extend to different lengths. It is powered by a hydraulic cylinder. The jib is a tilted strut that supports a fixed block. Cables are wrapped around the block, and then round another block attached to the load. When the free end of the cables is pulled, they deliver a force to the load equal to the applied force multiplied by the number of wraps of the cable.

Before starting any hoisting, the crane should be inspected to ensure it is in good working condition. It should be within its rated capacity, and the outriggers must be set to their full extension. If there are power lines in the area, they should be marked and the operator kept away from them. Also, the travel path should be checked for obstructions like wires and large rocks. Finally, the center of gravity of the load must be predicted and the rigging adjusted accordingly.