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Demag casting cranes for metal and minerals
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Wednesday, 20 Feb 2013

Mr Lutz Dowy, Head of Process Cranes said that “Our focus on specific applications such as those in the steel production sector has enabled us to develop in depth expertise in the industry. Our customers benefit from this wealth of knowledge since we are able to offer them crane solutions that are engineered to meet their exact needs.”

A recent project to Saudi Arabia saw 2 Demag caster cranes delivered. Each consist of a double girder overhead travelling cranes with spans of 22 m and lifting heights of 13 m. Each are equipped with 2 Demag hoist units which have load capacities of 120 tonne and 40 tonne installed on 1 crab.

Special spreaders used to handle the casting ladles have also been supplied. While the 120 tonne hoist unit is used for lifting, the 40 tonne hoist unit is employed for the tipping motion. Since this requires exact positioning of the crane installations the drive systems need sophisticated control in 3 motion axes. For this reason all of the Demag drives on the cranes the long and cross travel drives and the hoist drives are fed by frequency inverters.

Both of the process cranes are designed to operate reliably in arduous environments. Besides high dust levels temperatures reach up to 65°C. To ensure high availability the entire control system is installed in air conditioned switchgear cabinets on the crane bridge. The cranes are controlled from an enclosed crane cab which is also equipped with air conditioning. Alternatively remote radio control can also be used. Further special design features include an integrated weighing device that is used to measure and display the weight of the loads.

Terex Material Handling has the largest installed base of cranes and hoists worldwide and is present all over the world with a corresponding service organization to safeguard the availability of crane systems.

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