Overhead Cranes

Overhead Cranes or electric cranes of type Rotomatik’s single girder cranes are the most cost-effective solution for specific industries such as small & medium workshops, jobbing shops, medium-sized warehouses and precision plastic & metal stamping factories, just to list a few.

Depending on their applications, overhead travelling cranes can be fabricated either using an I-beam or boxed type design. Regardless of the form, the cranes are equipped with a host of safety features in compliance with Singapore Standards SS497:2011 and European Standards DIN EN 13001 and DIN EN 15011.

The overhead travelling cranes are essentially an equipment moving in X, Y and Z directions. The motors are probably the most vital elements of the crane.

All motors are carefully selected up to FEM 4M classification to ensure long life and high MTBF, on condition the cranes are regularly and consistently serviced.

In terms of maintenance, the computerised design structure and optimally selected components together with an in-built monitoring system allow the overhead travelling cranes to be quickly diagnosed if it fails and downtime is swiftly shortened.

The standard single girder overhead travelling cranes will usually have the following specifications:
• SWL up to 16t
• Span up to 28m

Click here to view application of overhead cranes: Clean Energy Supply Chain

The double girder overhead travelling cranes are vital for industries which require the salient features of the single girder type but with the additional ability to carry a higher SWL.

The specifications are:
• SWL up to 100t
• Span up to 50m

Underhung cranes are a special breed of overhead cranes. With underhung cranes, the end carriages ride on the bottom flange of the runway beam rather than on top flange like standard overhead cranes. The runway beam is often suspended from the roof / ceiling, which eliminates the need for extra floor columns to support the runway. This can be advantageous if there were floor space constraint. An underhung crane may be appropriate with multiple crane systems.

The specifications are:
• SWL up to 10t
• Span up to 20m

The distinct features are:
• More compact in terms of full utilisation of working space of workshops, factories and warehouses
• Optimally computerised design reducing load on building columns
• Two cranes can be interlocked to allow hoists to travel from one crane to the next increasing load travelling distance