Spinner-less hub access and lifting system for a wind turbine

Details Spinner-less hub access and lifting system for a wind turbine Spinner-less hub access and lifting system for a wind turbine

2008-11-21

2011-11-22

Lebentritt, Michael (Department: 2829)

Fluid reaction surfaces (i.e., impellers)

Support mounting, carrier or fairing structure

C415S123000

Reexamination Certificate

active

08061999

ABSTRACT:
A simple and safe means is provided to gain entry into the rotor hub of a wind turbine for maintenance operations within the hub. A ladder-like structure is mounted onto the rotor hub using the same bolts attaching a fixed outer race of the pitch bearing for the rotor blades. The ladder-like structure has integral with it a protective cage to the front, forming a basket. Structural elements for grasping are provided to a worker over the full path traversed from the nacelle to the entry hatch of the hub. An expanded area between rungs may be provided to facilitate entry by a service worker into the safety cage area. Lifting ears made also be formed with tubular sections integrated into the ladder-like structure.

REFERENCES:
patent: 7891941 (2011-02-01), Bevington et al.
patent: 2007/0273154 (2007-11-01), Pedersen
patent: 2009/0206610 (2009-08-01), Martin et al.
patent: 2010/0122508 (2010-05-01), Kristensen
patent: 2010/0181777 (2010-07-01), Grigg
patent: 2011/0113708 (2011-05-01), Skjaerbaek et al.
patent: 1944508 (2008-07-01), None
NORDEX, Nordex N90/2500 http://pdf.directindustry.com/pdf
ordex-energy-n90-2500/20682-33648.html.

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