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The heavy-duty slewing cranes in Liebherr's CAL series are used on so-called installation vessels that assemble offshore wind turbines. They can lift components weighing up to 1500 tonnes. An innovative concept, in which two energy chains are connected to each other and allow the jib to be slewed by up to 900 degrees, ensures energy transmission through the slewing ring.
The "Innovation" was commissioned in August 2012 and immediately proved its worth during the construction of the "Global Tech I" wind farm in the North Sea, around 40 kilometres north of Juist. There, 80 turbines with an output of 5 MW each were erected. Liebherr developed a complete series called CAL on the basis of the first "Crane around the leg". In the meantime, a second installation vessel, the "Vida", in which the crane was designed around the lifting leg, is already in operation. With the energy chain system developed by igus®-Engineering, the prerequisite is created for the reliable and mobile supply of energy and signals to the boom of the heavy-duty crane - according to the "energy around the leg" principle.
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