Gen­er­ally, the blades on the lat­est gen­er­a­tion of wind tur­bines are in­stalled in­di­vid­u­ally us­ing ro­tor blade yokes. To sta­bilise long ro­tor blades in the wind, helpers have had to be used on the ground with ve­hi­cles and, in some cases, even rope winches, to con­trol the blades us­ing long ropes. This re­quires a great deal of space on the ground as the force needed can only be gen­er­ated if the ropes are spanned at an ad­e­quately low an­gle. For erect­ing wind tur­bines in for­est ar­eas, this means that more trees have to be felled than the com­po­nent sizes of the crane and tur­bine com­po­nents them­selves would ac­tu­ally re­quire.

To over­come these chal­lenges, Liebherr has de­vel­oped a sin­gle-line guid­ing sys­tem (SLGS), which, ac­cord­ing to the com­pany makes the in­stal­la­tion process safer, more eco­nom­i­cal and in many cases also greener.

The SLGS is at­tached to the main boom on the side fac­ing the load. 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 SGLS 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. Since the hor­i­zon­tal ap­pli­ca­tion of force on the blade by the main boom is aligned, the SLGS im­proves the load con­trol dur­ing the blade in­stal­la­tion. The blades are sta­bilised in the wind by the crane’s main boom.

The SLGS can be used with ro­tor blade yokes from var­i­ous man­u­fac­tur­ers. Crane op­er­a­tors can retro­fit the SLGS on all con­ven­tional wind power boom sys­tems, in­clud­ing the new SX sys­tems on LR 1750/2 and LG 1750 cranes, with the ten­sion­ing winch be­ing in­stalled in­stead of the luff­ing jib ad­just­ment winch and the ex­ist­ing hy­draulic sys­tem be­ing used. Only the elec­tri­cal sys­tem and soft­ware are added.

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