How overhead cranes are operated? (2023)

What are the 3 basic components of an overhead crane?

How overhead cranes are operated?

Overhead cranes cover a rectangular area, moving a load side to side and backward and forward. The lifting device, called a hoist is mounted on a trolley for horizontal movement across a bridge beam connected to one or more horizontal girders which are supported at either end by end trucks.

What are the three operating functions of an overhead crane?

Overhead cranes lift, lower, and move horizontally along a rail or beam and are capable of safely lifting extremely heavy loads.

What is the most important thing a crane operator should do in preparation for making a lift?

Before lifting a load, verify that the hoist, hooks, and other components meet the operating requirements. It's especially important to make sure that the crane's chain is in top condition. You should not lift a load with a chain that's frayed, twisted, or otherwise damaged.

How does a crane work step by step?

A crane's boom acts as a lever, allowing the engine to apply a greater force over a shorter distance to lift the load. Additionally, it forces cranes to use counterweights that are heavier than the load to prevent the crane from tipping during lifts. A steel cable connects the boom to the load via a series of sheaves.

What is the principle used in the crane operation?

Cranes, like all machines, obey the principle of conservation of energy. This means that the energy delivered to the load cannot exceed the energy put into the machine. For example, if a pulley system multiplies the applied force by ten, then the load moves only one tenth as far as the applied force.

How do overhead cranes get power?

Electric overhead cranes, also known as bridge cranes, are typically powered by conductor bar, festooning or a cable reel. There are pros and cons of each type of electrification. In certain situations, overhead cranes are powered manually by push or hand geared options or with air power.

What must be checked completed and in place prior operating an overhead crane?

1 Ensure load rating is marked on each side of the crane or hoist and legible from the floor. 2 Check that warning labels are clean and legible. 3 Check hooks for deformation, cracks, bends, and excessive thread damage. 4 Check that the hook safety latch is in place and functioning properly.

Are cranes operated remotely?

In recent decades, technology has advanced to the point where cranes can be operated by remote control. While this technology has been around since the 1960s, it has continued to improve over the years, with newer systems providing more safety, reliability, efficiency, versatility, and cost savings than in the past.

What are the components of overhead?

Overhead expenses include accounting fees, advertising, insurance, interest, legal fees, labor burden, rent, repairs, supplies, taxes, telephone bills, travel expenditures, and utilities. There are essentially two types of business overheads: administrative overheads and manufacturing overheads.

What are the major components of overhead construction?

An overhead line consists of conductors and ground wires, towers, insulation, hardware, and foundations. The transmission line conductors are specialized, with large cross section and relatively few strands.