| 摘要 |
PURPOSE: To enable a blade to be mountable on a flat and packets of blades to be extracted easily by forming the flat formed by a plane at right angle to the shaft of a disc above a foot on each blade having a foot insertable radially into the support disc in a steam turbine. CONSTITUTION: A blade 1 in a stage of a steam turbine has a foot 2 with fingers 3. The fingers 3 are inserted into grooves 4 on the periphery of a disc 5. The blade 1 is fixed with respect to the disc 5 by a pin 7 inserted into a hole provided in the fingers 3. In this case, a flat 8 of a low height is formed in a portion of the blade 1 above the foot 2. An apparatus 14 for extracting packets of blades 12 comprises two levers 15 pivotably hinged to a shaft 16, a jack 19 interposed between front and rear arms 17, 18 arranged on each lever 15. A yoke 20 can be rested on the flat 8. Packets of blades are extracted while keeping the yoke onto the disc 5. |
