What Is The Difference Between A Single Girder Overhead Crane And A Double Girder Overhead Crane?

What is the difference between a single girder overhead crane and a double girder overhead crane?
 

Single-girder bridge crane and double-girder bridge crane are two common crane structures. There are some differences in their structural design and working principles. Below are the differences between single girder overhead cranes and double girder overhead cranes.

Differences in structural design:

1. Main girder structure: A single-girder bridge crane has only one main girder, while a double-girder bridge crane has two side-by-side main girders. The main beam of a single-girder bridge crane supports the weight and working load of the entire crane, while the two main beams of a double-girder bridge crane share the working load, increasing the stability and safety of the crane.

2. Span: The span of a single-girder overhead crane is usually smaller and suitable for narrow working sites; while the span of a double-girder overhead crane is usually larger and suitable for a wider working site.

3. Installation location: Single-girder bridge cranes are usually installed on the top of large factories, with the operating mechanism hanging below the main beam, and the crane can move laterally; while double-girder bridge cranes can also be installed on the top, with the operating mechanism hanging below the main beam, but Tracks can also be erected through the ground, and the crane can travel freely on the ground to meet work needs.

4. Height requirements: Since single-girder bridge cranes have only one main beam, the height requirements are low and are suitable for places with poor hardware conditions; while double-girder bridge cranes have two main beams and a long cantilever. It is more suitable for places with higher requirements.

Differences in working principles:

1. Load distribution method: The load of a single-girder bridge crane is concentrated on one main beam, and the main beam will bend and deform during operation; while the load of a double-girder bridge crane is evenly shared on the two main beams, reducing the The deformation of the main beam improves the stability of work.

2. Load-bearing capacity: Since a single-girder bridge crane has only one main beam, its load-bearing capacity is relatively small and is suitable for small and medium-sized lifting operations; while a double-girder bridge crane has two main beams and has a larger load-bearing capacity. Suitable for large lifting operations.

3. Lifting height: Since the single-girder bridge crane has a lower structural height, there are certain restrictions on the lifting height; while the double-girder bridge crane has a larger structural height and can meet higher lifting requirements. Require.

To sum up, the differences between single-girder bridge cranes and double-girder bridge cranes mainly include differences in structural design and working principles. Single-girder bridge cranes are suitable for small sites and places with low height requirements, and have a small load-bearing capacity; while double-girder bridge cranes are suitable for larger sites and places with higher height requirements, and have a larger load-bearing capacity. Depending on the specific work needs and site conditions, a suitable crane structure can be selected.