What are overhead cranes?


An overhead bridge crane is one of the most common types of industrial lifting equipment. This is due to its design, which allows you to maximize the use of the entire area of the room, while not taking up much space, because the crane itself is located above the work site or production facilities

Classification and construction

The main element of its design is a single or double girder overhead crane, thus where it gets its name. Overhead cranes come in both general and special applications. With general purpose everything is simple – the load is grabbed by a hook. Special cranes use different devices, whether it be an electromagnet or a grapple, etc.

A double-girder crane is more stable and withstands heavy-duty operations. The bridge consists of two parallel girders that rest on end carriages. Double-girder overhead cranes are also considered to be more productive in terms of lifting capacity.

A single girder crane, also known as a girder crane, has one single I-beam span which is supported by perpendicularly placed end girders. This design is cheaper and easier to install and maintain, but at the same time its lifting capacity is lower

In both cases, the bridge moves on rails – whether the crane’s or the railway’s, which are called the elevated crane track. There are two arrangements

A supported overhead crane is thus named because it rests its wheels on the crane rail. Its main disadvantage is the high price and a complicated mounting process, but its design is reliable and safe

A suspensded mast crane, on the other hand, is suspended from below to the beams of the rail track. This means that it has a lower capacity but is also cheaper than a supported crane.

To select the right crane, it is important to consider the following parameters:

Crane capacity - the amount of cargo that can be moved per unit time

The width of the span of an overhead crane is the distance between the rails of the crane track.

Lifting/lowering speed is the speed at which the load-carrying mechanism moves vertically

Never forget, though: it's always better to turn to professionals for advice!