Blade mounting

Abstract

The present invention concerns an arrangement for in situ mounting of rotor blades to a rotor hub of a wind power plant comprising rotor blades, a rotor hub ( 40 ), a disc ( 1 ), a means for rotation ( 30 ) of the disc ( 1 ) around its axis. The disc ( 1 ) is in connection with the rotor hub ( 40 ) in such a way that when the disc ( 1 ) rotates a certain degree of angle around its axis ( 3 ) it will cause the rotor hub ( 40 ) to rotate the same degree of angle around the axis of the rotor hub. When the means for rotation ( 30 ) comes into a desired position, the disc ( 1 ) is secured by a securing means ( 20; 36, 37 ).

1 . An arrangement for in situ mounting of rotor blades to a rotor hub of a wind power plant comprising rotor blades, a rotor hub, a disc, a means for rotation of the disc around its axis, the disc being in connected to rotor hub in such a way that when the disc rotates a certain degree of angle around its axis it will cause the rotor hub to rotate the same degree of angle around the axis of the rotor hub, the disc being provided with a connecting device, characterized in that the disc is caused to rotate by the means for rotation and when the means for rotation comes into a desired position, the disc is secured by a securing means. 
     
     
         2 . The arrangement according to  claim 1 , characterized in that the securing means comprises a male portion and a at least one female portion respectively, and that one of the portions has a fixed position in relation to the disc during rotation and the other portion has a non-fixed position in relation to the disc. 
     
     
         3 . The arrangement according to  claim 1 , characterized in that the securing means comprises a sleeve, having threads on its inner surface and a collar, having corresponding threads on its envelope surface and that when the sleeve ( 36 ) is screwed onto the collar, the means for rotation is secured from expansion. 
     
     
         4 . The arrangement according to  claim 1 , characterized in that the securing means is arranged to provide further adjustment of the rotation of the disc. 
     
     
         5 . The arrangement according to  claim 1 , characterized in that the securing means comprises a pivotal locking device arranged to prevent the rotor hub from further rotation. 
     
     
         6 . The arrangement according to  claim 1 , characterized in that the disc is a brake disc. 
     
     
         7 . The arrangement according to  claim 1 , characterized in that the connecting device of the brake disc consists of several through bores evenly distributed on the brake disc at a certain distance from the axis of the brake disc. 
     
     
         8 . The arrangement according to  claim 1 , characterized in that the locking device is rotatably arranged around a fixed position in its one end and provided with a locking connection at its other/opposite end, the locking connection being arranged to fit into the connecting device of the brake disc. 
     
     
         9 . The arrangement according to  claim 1 , characterized in that the means for rotation is a hydraulic cylinder and a hydraulic piston. 
     
     
         10 . The arrangement according to  claim 9 , characterized in that the hydraulic cylinder has a fastening means mounted on its piston, the fastening means having at least one through bore. 
     
     
         11 . A process for in situ mounting of rotor blades to a rotor hub of a wind power plant comprising rotor blades, a rotor hub, a disc, a means for rotation of the disc around its axis, the disc being in connection with the rotor hub in such a way that when the disc rotates a certain degree of angle around its axis it will cause the rotor hub to rotate the same degree of angle around the axis of the rotor hub, the disc being provided with a connecting device, characterized in that after having mounted the first rotor blade to the rotor hub the following steps take place:
 a means for rotation rotates the disc around its axis   when the means for rotation comes into a desired stroke position, the means for rotation is stopped to prevent further rotation and a securing means is connected via the brake disc or to lock the rotor hub against rotation, via the brake disc.   
     
     
         12 . The process according to  claim 11 , characterized in that when the last rotor blade has been mounted on the rotor hub, the locking device and means for rotation is disconnected from the disc. 
     
     
         13 . The process according to  claim 11 , characterized in that the means for rotation is a hydraulic cylinder and a hydraulic piston. 
     
     
         14 . (canceled)