JPH09189689A - Ultrasonic flaw detecting device for turbine blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an ultrasonic probe to be operated for a turbine blade of a threedimensional complex shape without dropping, etc., by setting a sufficient back-and-forth moving range for the ultrasonic probe to scan the bonding part of an anticorrosion piece for flaw detection, at least on the anticorrosion piece bonded to the front edge of the turbine blade. SOLUTION: To detect flaws in the anticorrosion piece 12 of a turbine blade 6, a moving mechanism 9 is set in a predetermined position along the front edge 7 of the blade 6 and temporarily stopped, and after at that position a roller 11 and an ultrasonic probe 14 are engaged with the front edge 7 of the blade 6 and the bonding position of the anticorrosion piece 12, the probe 14 is moved back and forth along Y direction as the mechanism 9 is moved back and forth along X direction in a fixed stroke. Thus rectangular scans of the probe 14 are effected, and the work of detecting flaws in the bonded part 13 of the anticorrosion piece 12 to the blade 6 can be performed automatically. In this case, the roller 11 is kept engaged with the front edge 7 of the blade 6 in such a way as to bite into the edge 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention effectively uses an ultrasonic flaw detection method to effectively determine the adhesion state of anticorrosion pieces adhered to the front edge of a turbine blade, mainly during the manufacture of power generation turbines or during regular inspections. The present invention relates to an ultrasonic flaw detector for turbine blades that can be inspected.

[0002]

2. Description of the Related Art Turbine blades for power generation turbines and the like are generally made of forged material, etc., but in particular, a high heat resistance, an erosion resistance and Due to demands for corrosion resistance and the like, anticorrosion pieces made of stellite or the like are adhered by welding or brazing.

If there is adhesion failure, damage, or the like in the bonded portion of the anticorrosion piece, it will be damaged during operation, which will cause a stop of operation, resulting in significant damage. Defects have been inspected not only at times but also during regular inspections.

Non-destructive inspection is usually adopted for defect inspection, and for example, X-ray fluoroscopy or ultrasonic flaw detection is known.

[0005]

However, as is well known, the turbine blade has a complicated three-dimensionally twisted shape, and the anticorrosion piece adhered to the leading edge of the turbine blade is also formed. Similarly curved. Since the adhesion part of the anticorrosion piece exists with a constant width along the leading edge of the turbine blade, when inspecting defects, the inspection equipment is complicated along the leading edge of the three-dimensionally twisted turbine blade. I have to move it.

For this reason, in the past, much labor was required, resulting in problems such as a reduction in flaw detection accuracy and inefficient work.

The present invention has been made in view of the above circumstances, and operates an ultrasonic probe on a turbine blade having a three-dimensionally complicated shape safely, reliably, easily, and quickly without dropping. It is an object of the present invention to provide an ultrasonic flaw detector for a turbine blade, which is capable of improving the accuracy and efficiency of flaw detection work using the ultrasonic flaw detection method.

[0008]

In order to achieve the above object, the invention of claim 1 is directed to a single turbine blade fixed in such a manner that its front edge portion is oriented substantially laterally, and to the front of the turbine blade. A moving mechanism that reciprocates in a direction substantially parallel to the edge portion, and projects from the moving mechanism toward the front edge portion of the turbine blade in a state in which vertical swinging is possible,
An arm whose tip is constantly pressed toward the turbine blade, and an arm provided at the tip of the arm, which engages with the back side and the ventral side of the front edge of the turbine blade in a state of biting them, and the front edge A plurality of rollers that roll along a line, and a tip of the arm that is supported at a position different from that of the rollers and that moves forwards and backwards facing the front edge of the turbine blade and that moves up and down with respect to the front edge. An ultrasonic probe capable of swinging is provided, and the ultrasonic probe is provided with an advance / retreat operation range sufficient to detect and scan the bonded portion on at least the anticorrosion piece bonded to the front edge portion of the turbine blade. It is characterized by being

According to a second aspect of the present invention, one of the plurality of turbine blades incorporated in the turbine rotor can be mounted through a gap between the other turbine blade and the front edge portion of the turbine blade. And a pair of holding members that are fixed by sandwiching the separated position of the turbine blade, and the holding members are connected to each other via a joint portion that absorbs the twist of the front edge portion of the turbine blade, and to the front edge portion of the turbine blade. A frame installed substantially in parallel, a movable body which is guided by the frame and can reciprocate along a front edge of the turbine blade, a handle for moving the movable body along the frame, and the movable body. An arm that protrudes from the body toward the front edge of the turbine blade in a state where it can be swung in the vertical direction, and the tip is constantly pressed toward the turbine blade; A plurality of rollers that are provided at the tip end and engage with the back side and the ventral side of the front edge portion of the turbine blade in a biting state, and roll along the front edge portion; An ultrasonic probe supported at a position different from that of the roller and capable of advancing and retracting in opposition to the front edge portion of the turbine blade and vertically swinging with respect to the front edge portion, and at least the ultrasonic probe It is characterized in that the advancing / retreating operation range is set sufficiently for flaw detection scanning of the bonded portion on the anticorrosion piece bonded to the front edge portion of the turbine blade.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an ultrasonic flaw detector for turbine blades according to the present invention will be described below with reference to the drawings.

According to one embodiment of the present invention, the flaw detection work is performed by an automatic operation in a state where the turbine blade is detached from the turbine rotor.

FIG. 1 is a perspective view schematically showing the entire apparatus of this embodiment, FIG. 2 is a front view showing a flaw detection mechanism portion, and FIG. 3 is an enlarged view showing a main portion of FIG. 4 is a left side view of FIG. 3, and FIG. 5 is a plan view of FIG.

As shown in FIG. 1, the ultrasonic flaw detector for a turbine rotor of this embodiment is roughly classified into a flaw detection mechanism section 1 and a flaw detection mechanism section 1.
It comprises an operation unit 2 as a flaw detection apparatus main body for performing flaw detection observation by remote control and data input, and a printer 3 for displaying the flaw detection result on a paper surface. These are connected by predetermined wirings 4 and 5.

As shown in FIGS. 2 to 5, the flaw detection mechanism portion 1 includes a fixing device 8 for fixing the turbine blade 6 by itself so that the front edge portion 7 of the turbine blade 6 is substantially lateral, and the fixing device 8.
The moving mechanism 9 that reciprocates in a direction substantially parallel to the front edge portion 7 of the turbine blade 6 fixed to the turbine blade 6, and protrudes from the moving mechanism 9 toward the front edge portion of the turbine blade in a state in which vertical swinging is possible. Arm 10, a plurality of rollers 11 provided at the tip of the arm 10 and engaged with and held at the front edge of the blade 6 to roll, and an arm 10 that is supported by the tip of the arm 10 to perform an advancing / retreating operation to move the turbine blade 6 Adhesive portion 13 of anticorrosion piece 12 made of stellite material or the like adhered to front edge portion 7
And an ultrasonic probe 14 for scanning flaw detection.

More specifically, the fixing device 8 includes a long flat substrate 15 that matches the length of the turbine blade 6, and the substrate 1.
5, a plurality of legs 16 supporting the blades 5, and a pair of blade mounting devices 17 mounted on both ends of the substrate 15 in the longitudinal direction to fix and hold the turbine blades 6. The blade mounting device 17 has a mounting table 18 on which the turbine blades 6 are mounted.
The height can be adjusted by the handle operating unit 20 using the above.

The moving mechanism 9 is composed of a tower-shaped frame 21 having a height that covers the range of height change due to the curvature of the front edge portion 7 of the turbine blade 6 fixed in a lateral arrangement.
The frame 21 is guided by a horizontal guide rod 22 provided on the base plate 15 along the longitudinal direction thereof, and is driven by engagement with a ball screw 23 arranged parallel to the same direction. ing. A motor 24 for rotationally driving the ball screw 23 and an encoder 25 for detecting the amount of rotation and thus the amount of movement of the frame 21 are connected to each end of the ball screw 23. This frame 2
The moving direction of 1 is the moving direction along the front edge of the turbine blade 6, and this direction is hereinafter referred to as the X direction, and the motor 24 is referred to as the X direction motor, and the encoder 25 is referred to as the X direction encoder or the like as necessary.

The frame 21 is provided with a plurality of vertical pillar-shaped guide rods 26.
A device holder 27 is attached to the so as to be able to move up and down. A compression coil spring 28 is provided around the lower end side of the guide rod 26, and the elastic force of the compression coil spring 28 causes the device holder 27 to move upward so that the device holder 27 can rise to a substantially intermediate position in the height direction of the guide rod 26. It is urged toward. Hereinafter, this vertical direction will be referred to as the Z direction, and the operating member in this direction will be referred to as the Z direction member or the like as necessary.

The equipment holder 27 includes a turbine blade 6
The arm 10 projecting toward the front edge portion 7 is held by a horizontal pin 29 as a fulcrum so that it can swing vertically. The arm 10 may include, for example, a pair of parallel rods 30.
And a proximal end block 31 that holds the proximal end of the rod 30 on the fulcrum side, and a distal end block 32 that is integrally provided at the distal end of the rod 30. The rod 30 is movable in the axial direction with respect to the base block 31, and the tip block 32 is biased toward the tip side by a spring 33. Hereinafter, this direction will be referred to as the Y direction, and the operating member in this direction will be referred to as a Y direction member or the like as necessary.

The tip block 32 has a rod 30.
One pin 34 is provided so as to project on an extension axis parallel to the roller holding block 35 and the pin 3
It is rotatably supported about 4. The roller holding block 35 rotatably supports the plurality of rollers 11 which are engaged and held by the front edge portion 7 of the turbine blade 6 and roll in the X direction. The roller 11 is a vertical roller composed of a horizontal roller 11a rolling on the front edge 7 of the blade 6 and one upper roller 11b and two lower rollers 11c rolling on the back side and the ventral side near the front edge 7 of the blade 6. It is paired with Laura. The upper roller 11b and the lower roller 11c are misaligned on the plane, and in a state where they are sandwiched between the back side and the abdomen side of the turbine blade 6 in a staggered state, they can roll without coming off. There is.

That is, the above-mentioned compression coil spring 28 biases the device holder 27 in the Z direction, and the device holder 27
The rod 30 held by is movable in the Y direction and is urged by a spring 33 toward the tip side. Therefore, once the upper roller 11b and the lower roller 11c are staggered to sandwich the back side and the abdomen side of the turbine blade 6, the arm 10 is placed at the raised position shown by the phantom line A in FIG. 4, for example. When the tip of the arm 10 is directed downward, a moving force toward the tip side, that is, the turbine blade 6 side in the Y direction is generated in the rod 30 due to its own weight, so that the roller 11 bites the turbine blade 6. Will not fall out.

On the other hand, when the arm 10 is arranged in the lowered position shown by the phantom line B in FIG. 4, the tip of the arm 10 faces upward and the front edge portion 7 of the turbine blade 6 faces downward.
In this case, the compression coil spring 28 is in a contracted state, the elastic force is increased, and the upward biasing force is increased.
The arm 10 strongly receives the pushing-up force, and a moving force toward the turbine blade 6 side is also generated at the tip end side, so that the roller 11 bites the turbine blade 6 and does not fall off.

When the inclination of the arm 10 is small as indicated by the solid line C in FIG. 4, the front edge 7 of the turbine blade 6 is almost horizontal, and no particular dropping action occurs. With the above functions, the roller 11 can follow the three-dimensional shape of the front edge portion 7 of the turbine blade 6 to follow the three-dimensional shape, and safely and accurately move along a predetermined trajectory.

Next, the ultrasonic probe 14 is connected to the arm 10
Is supported at a position different from that of the roller 11 at the tip end of the turbine blade 6 to move forward and backward in opposition to the front edge portion 7 of the turbine blade 6 and to swing the turbine blade 6 in the vertical direction with respect to the front edge portion 7. .

That is, a support member 37 is connected to the above-mentioned tip block 35 through a bracket 36, and a direction toward the turbine blade 6, that is, Y
A pair of parallel guide rods 38 and racks 39 are provided along the direction.

A motor 40 and gears 42 and 43 of a Y-direction encoder 41 mesh with the rack 39. The drive of the motor 40 allows the rack 39 to move forward and backward in the Y-direction, and the Y-direction encoder 41 moves the amount of movement. Can be detected.

A probe support block 44 is provided at the tip of the rack 39, and the probe support block 44 can be moved back and forth along the guide rod 38 in the Y direction. The probe support block 44 faces the probe support block 44 in the Y direction. A substantially U-shaped probe support bracket 46 is rotatably supported via a pin 45. Then, the ultrasonic probe 14 having the probe 48 is rotatably supported on the probe support bracket 46 via a shaft 47 extending in the X direction, whereby a so-called gimbal mechanism is configured, and the ultrasonic probe 14 is It can be freely rotated around the X-axis and Y-axis. Then, by the motor 40, on the ultrasonic probe 14, at least on the anticorrosion piece 12 bonded to the front edge portion of the turbine blade 6,
A sufficient forward / backward movement range is set for flaw detection scanning of the adhesive portion 13.

When the corrosion detecting piece 12 of the turbine blade 6 is to be inspected by the ultrasonic flaw detector of the present embodiment configured as described above, first the moving mechanism 9 is moved along the front edge portion 7 of the turbine blade 6 by a predetermined distance. Is set to the position, and is temporarily stopped, and after the roller 11 and the ultrasonic probe 14 are engaged with the bonding position of the front edge portion 7 of the turbine blade 6 and the anticorrosion piece 12 at the position, the moving mechanism 9 is moved in the X direction. The ultrasonic probe 14 is moved back and forth in the Y direction while reciprocating with a constant stroke.

As a result, the ultrasonic probe 14 is caused to perform a square scan, and the flaw detection work of the bonding portion 13 of the anticorrosion piece 12 to the turbine rotor 6 can be automatically performed. In this case, as described above, the roller 11 continues to engage with the front edge portion 7 of the turbine blade 6 in a state of being bitten, and follows the three-dimensional complicated shape of the turbine blade 6 to perform a copying operation without falling off. Safe and highly accurate flaw detection can be performed.

Next, another embodiment of the present invention will be described with reference to FIGS.
0 will be described.

In this embodiment, an ultrasonic flaw detector for a turbine blade is used for inspecting an adhesion portion of an anticorrosion piece adhered to a front edge portion of a turbine blade by an ultrasonic inspection method while the turbine blade is attached to a turbine rotor. In this case, both the X-direction scanning and the Y-direction scanning are manually performed.

FIG. 6 is a perspective view schematically showing the entire apparatus of this embodiment, FIG. 7 is a front view showing a flaw detection mechanism portion, FIG. 8 is a plan view of FIG. 7, and FIG. 7 is a right side view, and FIG. 10 is a left side partial view of FIG. 7.

As shown in FIG. 6, the ultrasonic flaw detector for turbine rotor according to the present embodiment is roughly classified into flaw detector mechanism section 51.
Further, it comprises a flaw detection device main body portion 52 for inputting data from this and performing flaw detection observation, and a printer 53 for displaying the flaw detection result on a paper surface. These are connected by predetermined wirings 54 and 55.

As shown in FIGS. 7 to 10, the flaw detection mechanism portion 51 is provided with respect to one of the plurality of turbine blades 6 incorporated in the turbine rotor 50 via a gap between the other turbine blades. It has a pair of sandwiching members 56 that can be mounted and that sandwiches and fixes the separated position of the front edge portion 7 of the turbine blade 6. The holding member 56 is, for example, a crocodile clip, a clamp mechanism such as screwing, or a fitting structure.

These holding members 56 are provided with a joint portion 57 which absorbs the twist of the front edge portion 7 of the turbine blade 6,
A frame 58 installed substantially parallel to the front edge portion 7 of the turbine blade 6 is connected. The joint portion 57 is composed of, for example, a link mechanism or the like, and absorbs twist by rotation.

A rack 59 is formed on the upper surface of the frame 58, and a movable body 61 that can reciprocate in the X direction along the front edge portion 7 of the turbine blade 6 in a state in which a gear 60 is meshed with the rack 59, The frame 58 is guided. The moving body 61 is a block-like member supported by a pair of guide rods 62 arranged in parallel to the side of the frame 58, and is movable in the X direction. Moving body 61
Is provided with a handle 63 for moving it along the frame 58. An X-direction encoder 64 that detects the amount of movement in the X-direction is connected to the gear 60.

The movable body 61 is provided with a plurality of vertical guide rods 65 that can be moved up and down.
A device holder 66 is attached to the upper end of the. A compression coil spring 67 is provided around the guide rod 65, and the elastic force of the compression coil spring 67 urges the device holder 66 upward to the extent that the device holder 66 can be raised to a substantially intermediate position in the height direction. There is. Hereinafter, this vertical direction will be referred to as the Z direction, and the operating member in this direction will be referred to as the Z direction member or the like as necessary.

The equipment holder 66 includes a turbine blade 6
An arm 68 projecting toward the front edge portion 7 is held so as to be swingable in the vertical direction with a horizontal pin 69 as a fulcrum. This arm 68 is, for example, a pair of parallel rods 70.
And a proximal end block 71 that holds the proximal end of the rod 70 on the fulcrum side, and a distal end block 72 integrally provided at the distal end of the rod 70. The rod 70 is movable in the axial direction with respect to the base block 71, and the tip block 72 is biased toward the tip side by a spring 73. Hereinafter, this direction will be referred to as the Y direction, and the operating member in this direction will be referred to as a Y direction member or the like as necessary.

The tip block 72 has a rod 70.
One pin 74 is provided so as to project on the extension axis parallel to the roller holding block 75 and the pin 7
It is rotatably supported about 4. On the roller holding block 75, a plurality of rollers 91 that are engaged and held by the front edge portion 7 of the turbine blade 6 and roll, are supported rotatably in the X direction. The roller 91 includes a horizontal roller 91a that rolls on the front edge 7 of the blade 6 and one upper roller 9 that rolls on the back side and the ventral side near the front edge 7 of the blade 6.
1b and a vertical roller composed of two lower rollers 91c form a set. The upper roller 91b and the lower roller 91c are misaligned on the plane, and in a state where they are sandwiched between the back side and the abdomen side of the turbine blade 6 in a staggered state, they can roll without coming off. There is.

That is, the above-mentioned compression coil spring 67 urges the device holder 66 in the Z direction, and the device holder 66 is urged.
The rod 70 held by is movable in the Y direction and is urged by a spring 73 toward the tip side. Therefore, once the upper roller 91b and the lower roller 91c are staggered to sandwich the back side and the abdomen side of the turbine blade 6, the arm 68 is arranged in the raised position and the tip of the arm 68 is directed downward. Rod 70
In addition, a moving force toward the tip side, that is, the turbine blade 6 side in the Y direction is generated due to its own weight, so that the roller 91 bites the turbine blade 6 and does not fall off.

On the other hand, when the arm 68 is arranged in the lowered position, the tip of the arm 68 faces upward and the front edge portion 7 of the turbine blade 6 faces downward. In this case, the compression coil spring 67 contracts. In this state, the elastic force is increased and the upward biasing force is increased, so that the arm 68 strongly receives the pushing-up force, and the turbine blade 6 still remains on the tip side.
Since the moving force toward the side is generated, the roller 91 bites the turbine blade 6 and does not fall off.

When the inclination of the arm 68 is small, the front edge portion 7 of the turbine blade 6 is close to a substantially horizontal state, and no particular dropping action occurs. With the above functions, the roller 91
Can follow the three-dimensional shape of the front edge portion 7 of the turbine blade 6 and follow the three-dimensional shape, and safely and accurately move along a predetermined trajectory.

Next, the ultrasonic probe 76 is connected to the arm 68.
Is supported at a position different from that of the roller 91 at the tip end of the turbine blade 6 to move forward and backward while facing the front edge portion 7 of the turbine blade 6 and to swing the turbine blade 6 in the vertical direction with respect to the front edge portion 7. .

That is, the supporting member 78 is connected to the above-mentioned tip block 72 via the bracket 77, and the supporting member 78 is directed in the direction toward the turbine blade 6, that is, Y.
A pair of parallel guide rods 79 and racks 80 are provided along the direction.

A gear 82 of a Y-direction encoder 81 is meshed with the rack 80. Further, a ball screw 83 for moving the guide rod 79 in the Y direction is provided.
Can be rotated by a handle 84. By driving the handle 84, the guide rod 79
Can be moved back and forth in the Y direction, and the amount of movement can be detected by the Y direction encoder 81.

A probe support block 85 is provided at the tip of the rod 79, and the probe support block 85 can be moved back and forth in the Y direction along the guide rod 79. The probe support block 85 faces the probe support block 85 in the Y direction. A substantially U-shaped probe support bracket 87 is rotatably supported via a pin 86. Then, the ultrasonic probe 76 having the probe 89 is rotatably supported on the probe support bracket 87 via the shaft 88 extending in the X direction, whereby a so-called gimbal mechanism is configured, and the ultrasonic probe 76 is It can be freely rotated around the X-axis and Y-axis. Then, by the handle 84, the ultrasonic probe 14 is set to have an advancing / retreating operation range sufficient to detect and scan the bonded portion 13 on the anticorrosion piece 12 bonded to at least the front edge of the turbine blade 6. ing.

When the corrosion detecting piece of the turbine blade is to be inspected by the ultrasonic flaw detector of the present embodiment configured as described above, first, as shown in FIG. 6 and FIG. The front edge of the turbine blade 6 is held, and the frame 58 extends along the front edge of the turbine blade 6. Then, the moving body 61 on the frame 58 is set at a predetermined position along the front edge portion 7 of the turbine blade 6 and temporarily stopped, and then the roller 91 and the ultrasonic probe 7 are set.
6 is engaged with the front edge portion 7 of the turbine blade 6 and the anticorrosion piece bonding position at that position, and then the movable body 61 is reciprocally moved in the X direction at a constant stroke by operating one handle 63 while the other handle is being operated. By operating 84, the ultrasonic probe 76 is moved back and forth in the Y direction.

As a result, the ultrasonic probe 76 is square-scanned, and the adhesion portion 13 of the anticorrosion piece 12 to the turbine blade 6 is formed.
The flaw detection work can be done manually. In this case, also in the present embodiment, as in the above-described embodiment, the roller 91
Keeps engaging with the front edge portion 7 of the turbine blade 6 in a state of being engaged, and follows the three-dimensional complex shape of the turbine blade 6 to perform a copying operation, thereby performing safe and highly accurate flaw detection without falling off. it can.

[0048]

As described in detail in the above embodiments, according to the present invention, an ultrasonic probe can be safely, reliably, easily and easily attached to a turbine blade having a three-dimensionally complicated shape without dropping. It is possible to operate quickly, and it is possible to achieve the effect of improving the accuracy and efficiency of flaw detection work using the ultrasonic flaw detection method.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an entire apparatus according to an embodiment of the present invention.

FIG. 2 is a front view showing a flaw detection mechanism section according to the embodiment of the present invention.

FIG. 3 is an enlarged view showing a main part of FIG. 2;

FIG. 4 is a left side view of FIG. 3;

FIG. 5 is a plan view of FIG. 3;

FIG. 6 is a perspective view schematically showing an entire apparatus according to another embodiment of the present invention.

FIG. 7 is a front view showing a flaw detection mechanism section according to another embodiment of the present invention.

FIG. 8 is a plan view of FIG. 7;

9 is a right side view of FIG. 7, showing a state where the arm is raised.

FIG. 10 is a partial left side view of FIG. 7, showing the arm at an intermediate height.

[Explanation of symbols]

 1 flaw detection mechanism 2 operation part 3 printer 4, 5 wiring 6 turbine blade 7 front edge part 8 fixing device 9 moving mechanism 10 arm 11 roller 12 anticorrosion piece 13 adhesive part 14 ultrasonic probe 15 substrate 16 leg 17 blade mounting device 18 mounting Table 19 Ball screw 20 Handle operation part 21 Frame 22 Guide rod 23 Ball screw 24 Motor 25 Encoder 26 Guide rod 27 Device holder 28 Compression coil spring 29 Pin 30 Rod 31 Base block 32 Tip block 33 Spring 34 pin 35 Roller holding block 36 Bracket 37 Support tool 38 Guide rod 39 Rack 40 Motor 41 Encoder 42, 43 Gear 44 Probe support block 45 Pin 46 Probe support bracket 47 Shaft 48 Probe 50 Turbine 51 51 flaw detection mechanism section 52 flaw detection apparatus main body section 53 printer 54, 55 wiring 56 sandwiching member 57 joint section 58 frame 59 rack 60 gear 61 moving body 62 guide rod 63 handle 64 encoder 65 guide rod 66 device holder 67 compression coil spring 68 Arm 69 Pin 70 Rod 71 Base Block 72 Tip Block 73 Spring 74 Pin 75 Roller Holding Block 76 Ultrasonic Probe 77 Bracket 78 Support Tool 79 Guide Rod 80 Rack 81 Encoder 82 Gear 83 Ball Screw 84 Handle 85 Probe Support Block 86 Pin 87 Probe support bracket 88 Axis 89 Probe 91 Roller

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Teruo Mine Inventor Teruo Mine No. 1 in Atsunoura Town, Nagasaki City, Nagasaki Mitsubishi Heavy Industries, Ltd. Nagasaki Shipyard (72) Inventor Atsushi Kagoki No. 1 Atsunoura Town, Nagasaki City, Nagasaki Prefecture Mitsubishi Heavy Industries Co., Ltd.Nagasaki Shipyard Co., Ltd. (72) Inventor Mikio Kushita 5-32-8 Nakakasai, Edogawa-ku, Tokyo Within aspect company (72) Inventor Chiyoji Sato 5-32-8 Nakakasai, Edogawa-ku, Tokyo No. Stock Company Aspect (72) Inventor Ebi Eburo No. 32-8 Nakakasai 5-chome, Edogawa-ku, Tokyo Inside Company Aspect

Claims (2)

[Claims] 1. A moving mechanism that reciprocates in a direction substantially parallel to the front edge of the turbine blade with respect to a single unit of the turbine blade fixed in an arrangement in which the front edge is substantially lateral.
An arm protruding from the moving mechanism toward the front edge of the turbine blade in a state capable of swinging in the vertical direction, and the tip of which is constantly pressed toward the turbine blade, and the turbine blade provided at the tip of the arm. A plurality of rollers that engage with the back side and the abdomen side of the front edge portion in a state of biting them and that rolls along the front edge portion, and are supported at the tip of the arm at a position different from the roller, An ultrasonic probe capable of performing a forward / backward movement facing the front edge portion of the turbine blade and capable of swinging in the vertical direction with respect to the front edge portion, wherein the ultrasonic probe has at least the front edge portion of the turbine blade. An ultrasonic flaw detector for a turbine blade, wherein a sufficient advance / retreat operation range is set for flaw detection scanning of the adhered portion on the anticorrosion piece adhered to the. 2. A turbine rotor, which can be mounted on one of a plurality of turbine blades incorporated in a turbine rotor through a gap between the turbine blade and another turbine blade, and which holds a separated position of a front edge portion of the turbine blade. And a pair of sandwiching members fixed to each other via a joint portion that absorbs the twist of the front edge portion of the turbine blade, and is installed substantially parallel to the front edge portion of the turbine blade. Frame, a movable body guided by the frame and capable of reciprocating along the front edge of the turbine blade, a handle for moving the movable body along the frame, and a vertical direction from the movable body. An arm that projects toward the front edge of the turbine blade in a swingable state and has its tip constantly pressed toward the turbine blade, and a arm provided at the tip of this arm. A plurality of rollers that engage with the dorsal and ventral sides of the front edge of the bin blade in a biting state and that roll along the front edge, and are supported at the tip of the arm at a position different from that of the rollers. And an ultrasonic probe capable of advancing and retreating in opposition to the front edge portion of the turbine blade and vertically swinging with respect to the front edge portion, and the ultrasonic probe includes at least the front edge portion of the turbine blade. An ultrasonic flaw detector for a turbine blade, wherein a sufficient advance / retreat operation range is set for flaw detection scanning of the adhered portion on the anticorrosion piece adhered to the.