A method for performing uptower maintenance of a wind turbine in order to replace the main bearing on the turbine shaft is disclosed. Embodiments of this method to perform maintenance may include installing a rotor lock to resist rotation of the main shaft during maintenance, providing a lifting dev
A method for performing uptower maintenance of a wind turbine in order to replace the main bearing on the turbine shaft is disclosed. Embodiments of this method to perform maintenance may include installing a rotor lock to resist rotation of the main shaft during maintenance, providing a lifting device in order to elevate the main shaft, removing the main bearing from its main bearing housing, and installing a replacement split main bearing. A crane may also be installed uptower to assist in the maintenance.
대표청구항▼
1. A method for performing maintenance of a wind turbine, the wind turbine comprising one or more turbine blades connected to a main shaft and a nacelle housing for enclosing components of the wind turbine including at least a portion of the main shaft and an O-shape main bearing, the main bearing f
1. A method for performing maintenance of a wind turbine, the wind turbine comprising one or more turbine blades connected to a main shaft and a nacelle housing for enclosing components of the wind turbine including at least a portion of the main shaft and an O-shape main bearing, the main bearing fixable to a stationary position with respect to the main shaft by a main bearing housing formed with a top half bearing housing and a bottom half bearing housing, the method comprising: installing a rotor lock in order to resist rotation of the main shaft during maintenance of the wind turbine;providing a lifting device in order to elevate the main shaft to a clearance height;sliding the main bearing housing over the main shaft prior to removal of the main bearing housing and the O-shape main bearing in order to avoid damaging a position on the main shaft position in which the main bearing is designed to operate;removing the main bearing housing from the main shaft;removing the O-shape main bearing from the main shaft by cutting the O-shape main bearing from the main shaft;installing a split main bearing to the main shaft, the split main bearing consisting of a pair of semicircular inner races, a pair of semicircular outer races, and at least one pair of rollers to rotate between the inner races and the outer races; andinstalling a replacement bottom portion of the main bearing housing and a replacement top portion of the main bearing housing to hold the split main bearing. 2. The method of claim 1 further comprising affixing a crane to the nacelle housing, the crane operable to maneuver and lift components of the wind turbine. 3. The method of claim 2, wherein the crane is sectionable into components and, wherein said affixing further comprises assembling the components of the crane uptower. 4. The method of claim 1, wherein the rotor lock circumscribes at least a portion of the main shaft when installed. 5. The method of claim 4, wherein the rotor lock is installed between the turbine blades and the main bearing housing. 6. The method of claim 1, wherein the clearance height is greater than one half inch. 7. The method of claim 1 further comprising removing the main bearing housing prior to removing the main bearing and providing a replacement main bearing housing for holding the installed split main bearing. 8. The method of claim 7, further comprising repairing the main shaft after the main bearing and main bearing housing are removed, and before the replacement bearing housing and the split main bearing are installed. 9. The method of claim 8, wherein repairing the main shaft includes repairing damage to the main shaft in order to reestablish an operating outer diameter of the main shaft. 10. The method of claim 1, wherein the installing a rotor lock, the providing a lifting device, the removing the main bearing housing, the removing the main bearing, the installing a split main bearing, and the installing a replacement bottom portion of main bearing housing and a replacement top portion of the main bearing housing occur uptower on the wind turbine. 11. The method of claim 1, wherein said installing the split main bearing comprises installing the bottom portion of a replacement bearing housing, securing the pair of semicircular inner races about the main shaft, positioning the pair of at least one pair of rollers about the semicircular inner races, and securing the pair of semicircular outer races about the at least one pair of rollers thereby securing the semicircular inner races, the at least one pair of rollers, and the semicircular outer races together about the main shaft, lowering the main shaft, and installing a top half of the replacement bearing housing. 12. The method of claim 1, further comprising affixing a first crane and an additional crane on the nacelle housing, the first crane and the additional crane operable to maneuver and lift components of the wind turbine. 13. The method of claim 12, wherein the first crane is utilized for lifting and positioning the additional crane. 14. The method of claim 13, wherein the additional crane is divisible into components, and wherein the first crane is operable to lift and position the components in order to assemble the additional crane. 15. The method of claim 14, wherein the components of the additional crane individually weigh 50 lbs or less. 16. A method for performing maintenance of a wind turbine, the wind turbine comprising one or more turbine blades connected to a main shaft and a nacelle housing for enclosing components of the wind turbine including at least a portion of the main shaft and an O-shape main bearing, the main bearing fixable to a stationary position with respect to the main shaft by a main bearing housing formed with a top half bearing housing and a bottom half bearing housing, the method comprising: affixing a first crane to the nacelle housing, the first crane sectionable into components;affixing a second crane to the nacelle housing, portions of the second crane lifted into place using the affixed first crane, the second crane operable to maneuver and lift components of the wind turbine;installing a rotor lock between the turbine blades and the main bearing housing in order to resist rotation of the main shaft, the installed rotor lock circumscribing at least a portion of the main shaft;providing a lifting device in order to elevate the main shaft to a clearance height;sliding the main bearing housing over the main shaft prior to removal of the main bearing housing and the O-shape main bearing in order to avoid damaging a position on the main shaft position in which the main bearing is designed to operate;removing the main bearing housing from the main shaft;removing the O-shape main bearing from the main shaft by cutting the O-shape main bearing from the main shaft;installing a split main bearing to the main shaft, the split main bearing consisting of a pair of semicircular inner races, a pair of semicircular outer races, and at least one pair of rollers to rotate between the inner races and the outer races; andinstalling a replacement bottom portion of the main bearing housing and a replacement top portion of the main bearing housing for holding the split main bearing,wherein said installing a rotor lock, said providing a lifting device, said removing the main bearing housing, said removing the main bearing, said installing a split main bearing, and said installing said replacement bottom portion of the main bearing housing and said replacement top portion of the main bearing housing occur up tower on the wind turbine. 17. The method of claim 16, wherein the components of the first crane each weigh about 50 lbs or less. 18. The method of claim 16, further comprising repairing the main shaft after removing the main bearing, and before installing a split main bearing.
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