Rotor blade detachment device and rotor blade detachment method

Abstract

There is provided a rotor blade detachment device that detaches a rotor blade from a disk, the rotor blade detachment device including a hook that is contactable with the rotor blade, and a drawing portion that is connected to the hook and moves the hook in a drawing direction from a second end surface of the disk toward a first end surface of the disk, in which the hook has a contact portion that is contactable with the rotor blade from a second axis line side in an axial direction, and an arm that extends from the contact portion in the drawing direction, and the drawing portion is connected to the arm at a position opposite to the contact portion in the drawing direction, and applies a load to the hook in the drawing direction.

What is claimed is: 
     
         1 . A rotor blade detachment device that detaches a rotor blade from a disk,
 wherein the disk has
 an outer peripheral surface that extends in a circumferential direction about an axis line, a first end surface that faces a first axis line side of both sides in an axial direction in which the axis line extends, a second end surface that faces a second axis line side opposite to the first axis line side, and a root groove, 
   the root groove is recessed from the outer peripheral surface toward a radial inner side in a radial direction of the axis line, and penetrates from the second end surface to the first end surface,   the rotor blade has
 a blade body that has a cross-section in a blade shape perpendicular to the radial direction, and extends in the radial direction, and a blade root that is provided on the radial inner side of the blade body, and is fitted into the root groove in a state of being inserted from the first axis line side toward the second axis line side, 
   the rotor blade detachment device comprises:
 a hook that is contactable with the rotor blade; and 
 a drawing portion that is connected to the hook, and is configured to move the hook in a drawing direction from the second end surface toward the first end surface, 
   the hook has
 a contact portion that is contactable with the rotor blade from the second axis line side in the axial direction, and 
 an arm that extends from the contact portion in the drawing direction, and 
   the drawing portion is connected to the arm at a position opposite to the contact portion in the drawing direction, and is configured to apply a load to the hook in the drawing direction.   
     
     
         2 . The rotor blade detachment device according to  claim 1 ,
 wherein the hook further includes a support portion that is contactable with the rotor blade from the first axis line side, and is configured to support the rotor blade in a state in which the rotor blade is not movable in the drawing direction, together with the contact portion.   
     
     
         3 . The rotor blade detachment device according to  claim 2 ,
 wherein the hook has a base that is connected to the arm at the position opposite to the contact portion in the drawing direction, and extends in a direction perpendicular to the drawing direction, and   the support portion is moved at the base to approach the hook, and supports the rotor blade by pressing the rotor blade against the contact portion and sandwiching the rotor blade with the contact portion.   
     
     
         4 . The rotor blade detachment device according to  claim 3 ,
 wherein the base is formed with a screw hole,   the support portion has a screw shaft that is movable at the base in a state of being inserted into the screw hole, and   the screw shaft is contactable with the rotor blade from the first axis line side by being moved at the base to approach the contact portion.   
     
     
         5 . The rotor blade detachment device according to  claim 1 ,
 wherein the drawing portion is attachable to and detachable from the hook.   
     
     
         6 . The rotor blade detachment device according to  claim 1 ,
 wherein the drawing portion has
 a first frame that extends in the drawing direction to extend the arm of the hook, and 
 a second frame that is connected to the first frame at a position opposite to the hook in the drawing direction, and extends in a direction perpendicular to the drawing direction with respect to the first frame, and 
   the load is applied to the second frame.   
     
     
         7 . The rotor blade detachment device according to  claim 6 ,
 wherein a chipping hammer applies the load to the drawing portion.   
     
     
         8 . The rotor blade detachment device according to  claim 1 ,
 wherein the drawing portion has
 a support column that extends in a rod shape in the drawing direction to extend the arm of the hook, 
 an impact portion that is connected to the support column at a position opposite to the hook in the drawing direction, and extends in a direction perpendicular to the drawing direction with respect to the support column to increase a diameter of the support column, and 
 a hammer portion that extends in the direction perpendicular to the drawing direction with respect to the support column, is movable in the drawing direction in a state in which the support column is internally inserted, and collides with the impact portion. 
   
     
     
         9 . The rotor blade detachment device according to  claim 1 ,
 wherein a width of the drawing portion, which is orthogonal to the drawing direction, is more than a width of the contact portion, which is orthogonal to the drawing direction.   
     
     
         10 . A rotor blade detachment method of detaching a rotor blade from a disk,
 wherein the disk has
 an outer peripheral surface that extends in a circumferential direction about an axis line, a first end surface that faces a first axis line side of both sides in an axial direction in which the axis line extends, a second end surface that faces a second axis line side opposite to the first axis line side, and a root groove, 
   the root groove is recessed from the outer peripheral surface toward a radial inner side in a radial direction of the axis line, and penetrates from the second end surface to the first end surface,   the rotor blade has
 a blade body that has a cross-section in a blade shape perpendicular to the radial direction, and extends in the radial direction, and a blade root that is provided on the radial inner side of the blade body, and is fitted into the root groove in a state of being inserted from the first axis line side toward the second axis line side, 
   the rotor blade detachment method comprises:
 a preparation step of preparing a rotor blade detachment device 
 a device disposition step of disposing the rotor blade detachment device at the disk; and 
 a rotor blade movement step of moving the rotor blade attached to the disk by operating the rotor blade detachment device, 
   the rotor blade detachment device prepared in the preparation step includes
 a hook that is contactable with the rotor blade, and 
 a drawing portion that is connected to the hook, and is configured to move the hook in a drawing direction from the second end surface toward the first end surface, 
   the hook has
 a contact portion that is contactable with the rotor blade from the second axis line side in the axial direction, and 
 an arm that extends from the contact portion in the drawing direction, the drawing portion is connected to the arm at a position opposite to the contact portion in the drawing direction, and is configured to apply a load to the hook in the drawing direction, 
   in the device disposition step, the hook is brought into contact with the rotor blade from the second axis line side in the axial direction, and the drawing portion is disposed on the first axis line side with respect to the rotor blade, and   in the rotor blade movement step, the rotor blade is moved in the drawing direction by applying the load to the drawing portion.   
     
     
         11 . The rotor blade detachment method according to  claim 10 ,
 wherein the drawing portion has
 a first frame that extends in the drawing direction to extend the arm of the hook, and 
 a second frame that is connected to the first frame at a position opposite to the hook in the drawing direction, and extends in a direction perpendicular to the drawing direction with respect to the first frame, 
   the load is applied to the second frame, and   in the rotor blade movement step, the load is applied to the second frame by a chipping hammer to move the rotor blade in the drawing direction.   
     
     
         12 . The rotor blade detachment method according to  claim 10 ,
 wherein the drawing portion has
 a support column that extends in a rod shape in the drawing direction to extend the arm of the hook, 
 an impact portion that is connected to the support column at a position opposite to the hook in the drawing direction, and extends in a direction perpendicular to the drawing direction with respect to the support column to increase a diameter of the support column, and 
 a hammer portion that extends in the direction perpendicular to the drawing direction with respect to the support column, is movable in the drawing direction in a state in which the support column is internally inserted, and collides with the impact portion, and 
   in the rotor blade movement step, the load is applied to the drawing portion by moving the hammer portion in the drawing direction to collide with the impact portion, and the rotor blade is moved in the drawing direction.