Liebherr has developed a single-line guiding system (SLGS) for its LR 1750/2 and LG 1750 lattice boom cranes.
The manufacturer claims that the SLGS makes the installation of wind turbine blades safer and more economical. The system, which is attached to the main boom on the side facing the load, stabilises the blades during the installation.
A rope is secured at the top of the boom head and tensioned using a rope winch below in the pivot section. A cable pulley with two connections to the outsides of the rotor blade yoke runs along the boom rope during the hoisting process.
With its own power supply in the yoke, the two connections to the SLGS are tensioned so that the blade is stabilised in the wind and can also be moved into the correct angle for installation on the hub, said Liebherr.
The SLGS can be retrofitted on all conventional wind power boom systems, including the new SX systems fitted on the LR 1750/2 and LG 1750 cranes. In this scenario, the tensioning winch is installed instead of the luffing jib adjustment winch and the existing hydraulic system can be used. Only the electrical system and software are added.
According to Liebherr, stabilising blades in windy conditions has been achieved using vehicles on the ground and, in some cases, using rope winches. The SLGS eliminates the need for these practices.