JP2019082398A - Blade groove observation device and blade groove observation method - Google Patents

Abstract

To improve workability for inspection of a blade groove.SOLUTION: A blade groove observation device comprises: a carrier; a two rollers each having a rotational shaft parallel with each other, and provided at a lower part of the carrier so as to be rotatable to the carrier; a light irradiation unit provided so as to project downward from the carrier; and an observation unit provided so as to project downward from the carrier, and configured to observe a light irradiation area in a blade groove radiated by the light irradiation unit. The light irradiation unit and the observation unit are positioned below a plane containing a central axis of the two rollers.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a blade and groove observation device and a blade and groove observation method.

In a turbine such as a gas turbine or a steam turbine, a turbine blade is attached to a rotor disk with a blade root portion of the turbine blade being inserted into a blade groove for fixing a turbine blade formed on a rotor disk outer peripheral surface of the turbine rotor. It is fixed.
For example, since a turbine rotor of a steam turbine is operated at high temperature conditions, when it is used for a long time, cracks may occur in a stressed site due to stress corrosion cracking or the like. Therefore, inspections are performed regularly to inspect the presence or absence and size of cracks in each part of the turbine rotor.
As a method of inspecting the presence or absence of a defect such as a crack generated in the turbine rotor and the size thereof, for example, magnetic powder flaw detection can be mentioned (see Patent Document 1).

Unexamined-Japanese-Patent No. 2003-294716

  For example, when the blade groove is a blade groove called a T route type provided in the circumferential direction, the width of the opening of the outer peripheral surface of the rotor disk is narrower than the width inside the blade groove. Therefore, when inspecting the inside of the T-route type blade groove by magnetic particle flaw detection, the inspector manually uses a small mirror for observing a portion that can not be directly viewed from the outside and an ultraviolet lamp for emitting fluorescent magnetic powder. I had an inspection at it. Therefore, depending on the location of the wing groove, it may be difficult to confirm, or since both hands may be blocked by a mirror and an ultraviolet lamp, improvement in workability is required.

  In view of the above-described circumstances, at least one embodiment of the present invention aims to improve the efficiency of blade groove inspection.

(1) A blade and groove observation device according to at least one embodiment of the present invention,
With the carrier,
Two rollers, each having a rotational axis parallel to one another and rotatably mounted relative to the carrier at the bottom of the carrier;
A light irradiator provided to project downward from the carrier;
An observation unit provided so as to project downward from the carrier, and observing a light irradiation area inside the blade groove by the light irradiation unit;
The light emitting unit and the observation unit are located below a plane including central axes of the two rollers.

According to the configuration of the above (1), since the light irradiation unit and the observation unit are located below the plane including the central axes of the two rollers, the light irradiation unit and the observation unit are inserted into the wing groove The blade groove observation device can be arranged on the rotor disc. This eliminates the need for the inspector to manually hold the light irradiation unit and the observation unit, thereby improving the workability of the blade groove inspection.
In addition, even if the light irradiation unit and the observation unit are still inserted into the wing groove, the blade groove observation device can be moved along the wing groove by the lower roller of the carrier. The blade and groove inspection can be performed efficiently.

(2) In some embodiments, in the configuration of (1) above,
And a holder fixed to the carrier and holding the light emitting unit and the observation unit.
The holder is arranged and fixed to the carrier such that the projected position on the plane is located between the two rollers.

  According to the configuration of (2), since the holder is located between the two rollers, by arranging the blade groove observing device with respect to the rotor disk such that the two rollers contact the rotor disk, the rotor disk The position of the holder relative to is stabilized. As a result, inspection can be performed in a state in which the postures of the light emitting unit and the observation unit are stable with respect to the rotor disk.

(3) In some embodiments, the configuration (1) or (2) further includes a guide configured to guide the carrier along the blade groove.

  According to the configuration of the above (3), since the blade groove observing device can be stably moved along the blade groove, the workability of the blade groove inspection is improved.

(4) In some embodiments, in the configuration of the above (3), the guide portion is a guide roller formed so that the diameter decreases toward the end from the center in the width direction.

  According to the configuration of the above (4), since the blade groove observing device can be stably moved along the blade groove, the workability of the blade groove inspection is improved.

(5) In some embodiments, in any one of the configurations (1) to (4), the carrier includes a magnet arranged such that magnetic force lines are distributed downward of the carrier.

  According to the configuration of (5), since the blade groove observing device can be attached to the rotor disk by the magnetic force of the magnet, even if the blade groove observing device is moved downward along the circumferential direction of the rotor disk, the blade groove is Since the observation device can be prevented from falling off the rotor disk, the blade groove observation device can be easily moved along the circumferential direction of the rotor disk, and the workability of the blade groove inspection can be improved.

(6) In some embodiments, in any one of the configurations (1) to (5), the carrier includes a brake device capable of prohibiting at least one rotation of the roller.

  According to the above configuration (6), the blade groove observing device can be prevented from unintentionally moving along the circumferential direction of the rotor disk due to gravity, so that the workability of the blade groove inspection is improved.

(7) In some embodiments, in the configuration of (6), the carrier includes a grip having a grip lever for releasing the brake of the brake device.

  According to the configuration of the above (7), the inspector can release the brake of the brake device by holding the grip portion to move the blade groove observation device along the circumferential direction of the rotor disk. Improves the quality.

(8) In some embodiments, in any of the configurations (1) to (7),
A mirror for guiding light emitted from the light emitting unit to the light emitting area;
And a holder fixed to the carrier and holding the light emitting unit, the mirror, and the observation unit.
The holder includes a frame holding at least the mirror at a lower portion of the holder,
The mirror extends along a plane rotated with respect to the extending surface of the frame around an axis along the width direction of the frame, and reflects light from above from the light emitting unit Configured as.

In the T root type blade groove, a crack is likely to be generated at the radially outer corner portion of the blade groove. However, when light is emitted downward from the light irradiator while the light irradiator is inserted into the inside of the blade groove from the opening of the outer peripheral surface of the rotor disk, that is, the blade groove is irradiated radially inward of the rotor disk, It is difficult for light to reach the radially outer corner part of.
In that respect, according to the configuration of the above (8), since the light from the upper side from the light irradiation part is reflected by the mirror, the light can easily reach the corner portion on the radially outer side of the wing groove. As a result, it becomes easy to observe the part where the crack is likely to occur, so the workability of the blade groove inspection is improved.

(9) In some embodiments, in the configuration of (8) above,
The frame has a pivoting plate portion that rotatably holds the mirror around an axis along the width direction of the frame.
The apparatus further includes a drive mechanism for rotating the rotating plate portion around an axis along the width direction of the frame.

  According to the configuration of the above (9), the angle of reflection of light from above from the light irradiation portion by the mirror can be adjusted by rotating the rotation plate portion around the axis along the width direction of the frame. Light can be efficiently irradiated to the area to be observed.

(10) A blade and groove observation device according to at least one embodiment of the present invention,
A light irradiator,
A mirror for guiding the light irradiated from the light irradiation unit to an observation target area inside the blade groove;
An observation unit for observing the observation target area;
And a holder for holding the light emitting unit, the mirror, and the observation unit.
The holder includes a frame holding at least the mirror at a lower portion of the holder,
The mirror extends along a plane rotated with respect to the extending surface of the frame around an axis along the width direction of the frame, and reflects light from above from the light emitting unit Configured as.

According to the configuration of the above (10), if the holder is inserted into the wing groove so that the light irradiating portion, the mirror and the observation unit are positioned inside the wing groove, the inspector manually operates the light irradiating portion and the observation unit. Since it is not necessary to have them, the working efficiency of the blade groove inspection is improved.
In addition, since the light from the upper side from the light irradiation portion is reflected by the mirror, the light can easily reach the corner portion on the radially outer side of the blade groove. As a result, as described above, it becomes easy to observe the corner portion on the radially outer side of the blade groove, which is a portion where a crack tends to occur, and the workability of the blade groove inspection is improved.

(11) In some embodiments, in the configuration of (10),
The frame has a pivoting plate portion that rotatably holds the mirror around an axis along the width direction of the frame.
The apparatus further includes a drive mechanism for rotating the rotating plate portion around an axis along the width direction of the frame.

  According to the configuration of the above (11), the angle of reflection of light from above from the light irradiation portion by the mirror can be adjusted by rotating the rotation plate portion around the axis along the width direction of the frame. Light can be efficiently irradiated to the area to be observed.

(12) A blade and groove observation method according to at least one embodiment of the present invention,
It is a blade groove observation method which observes the inside of the blade groove of a rotor disk using the blade groove observation device of composition of either of the above (1) thru / or (11),
Inserting at least the light emitting unit and the observation unit into the wing groove;
In the state where the light irradiation unit and the observation unit are inserted into the inside of the blade groove, the light irradiation area inside the blade groove is irradiated with the observation unit while the light is irradiated from the light irradiation unit to the inside of the blade groove. And observing.

  According to the above method (12), the inside of the blade groove of the rotor disk is observed using the blade groove observing apparatus having any one of the configurations (1) to (11). There is no need to hold the observation unit by hand, which improves the workability of the blade groove inspection.

  According to at least one embodiment of the present invention, it is possible to improve the workability of blade groove inspection.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram showing the external appearance of the wing groove observation apparatus which concerns on one Embodiment, (a) is a side view, (b) is the figure seen from the illustration right side of (a). It is a perspective view of the wing groove observation device concerning one embodiment. It is a perspective view of the holder of the wing groove observation device of some embodiments. It is a perspective view of the holder which concerns on some embodiment in the state to which the light irradiation part and the observation unit were attached. FIG. 7 is a perspective view of the lower portion of the holder according to some embodiments. It is a schematic diagram for demonstrating the method to change the reflection angle of a mirror, (a) shows the state by which the rotation position of the mirror was regulated by the tip part of the side part of a moving frame, (b) These show the state in which the front-end | tip part of the side part fell rather than (a). It is a figure which shows typically the state which provided the ultraviolet cut filter in the front-end | tip part of the insertion part. It is a perspective view of the external appearance of the wing groove observation device concerning other embodiments. It is a sectional view showing the structure of a brake device typically. It is a perspective view of a roller by which rotation is prohibited by a brake device. It is a sectional view showing the structure of a brake device typically. It is a flowchart which shows the general | schematic flow of the blade groove observation method performed using the blade groove observation apparatus which concerns on some embodiment.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely illustrative. Absent.
For example, a representation representing a relative or absolute arrangement such as “in a direction”, “along a direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” is strictly Not only does it represent such an arrangement, but also represents a state of relative displacement with an angle or distance that allows the same function to be obtained.
For example, expressions that indicate that things such as "identical", "equal" and "homogeneous" are equal states not only represent strictly equal states, but also have tolerances or differences with which the same function can be obtained. It also represents the existing state.
For example, expressions representing shapes such as quadrilateral shapes and cylindrical shapes not only represent shapes such as rectangular shapes and cylindrical shapes in a geometrically strict sense, but also uneven portions and chamfers within the range where the same effect can be obtained. The shape including a part etc. shall also be expressed.
On the other hand, the expressions "comprising", "having", "having", "including" or "having" one component are not exclusive expressions excluding the presence of other components.

FIG. 1 is a schematic view showing an appearance of a wing groove observation apparatus 1 according to an embodiment, FIG. 1 (a) is a side view, and FIG. 1 (b) is an illustration of FIG. It is the figure seen from the right side. FIG. 2 is a perspective view of a wing groove observation device 1 according to an embodiment.
Moreover, FIG. 8 is a perspective view of the external appearance of the blade and groove observation device 1A according to another embodiment.
In FIG. 2, the descriptions of the light irradiation unit 30, the observation unit 40, the mirror 35 and the like, which will be described later, are omitted.

  Blade groove observation devices 1 and 1A according to some embodiments shown in FIG. 1 and FIG. 8 are for inspecting blade grooves formed on a rotor disk outer peripheral surface of a turbine rotor in a turbine such as a gas turbine or a steam turbine. It is an apparatus. The blade groove observation devices 1 and 1A according to some embodiments described below can be used for inspection of a narrow portion such as a T route type blade groove.

  The blade and groove observation device 1 according to the embodiment shown in FIG. 1 includes a carrier 10, two rollers 20, a light irradiation unit 30, and an observation unit 40. Further, a blade groove observation device 1 according to an embodiment shown in FIG. 1 includes a guide roller 50 and a magnet 60. A blade groove observation device 1 according to an embodiment shown in FIG. 1 includes a holder 100 attached to a carrier 10. A mirror 35 is attached to the holder 100.

  A wing groove observation device 1A according to another embodiment shown in FIG. 8 includes a light irradiation unit 30, a mirror 35, an observation unit 40, and a 100 holder.

  For convenience of explanation, the vertical direction in FIGS. 1A, 1B and 8 is defined as the vertical direction of the blade groove observation device 1, 1A according to some embodiments. As described later, in the state where the blade groove observation devices 1 and 1A according to some embodiments are arranged on the outer peripheral surface of the rotor disk, the vertical direction of the blade groove observation devices 1 and 1A according to some embodiments is , Facing the same direction as the rotor disk radial direction. The upper direction of the blade groove observation device 1, 1A faces the radially outer side of the rotor disk, and the lower direction of the blade groove observation device 1, 1A faces the radially inner side of the rotor disk.

In the blade and groove observation device 1 according to the embodiment shown in FIG. 1, the carrier 10 is a frame to which the roller 20, the holder 100, the guide roller 50 and the magnet 60 are attached. In the carrier 10, a fixing portion 11 to which the holder 100 is fixed is provided on the upper portion of the carrier 10.
The carrier 10 has a grip 12 for handling the wing groove observation device 1. The grip portion 12 has a grip lever 77 for releasing the brake of the brake device described later.

Further, on the carrier 10, two rollers 20 respectively having rotation shafts 21 parallel to each other with the fixing portion 11 interposed therebetween are rotatably provided at the lower part of the carrier 10 with respect to the carrier 10.
Each of the two rollers 20 has a tire 22 attached to both ends of the rotation shaft 21 (see FIG. 1 (b)). The tire 22 is made of, for example, an elastic material such as urethane or rubber.

The light irradiator 30 according to some embodiments is for irradiating light, and is, for example, an optical fiber cable 31 that guides the ultraviolet light emitted by the ultraviolet light emitting device 3 and irradiates the light within the wing groove 5. The light irradiator 30 of some embodiments is fixed to the holder 100. In addition, the light irradiation part 30 of one Embodiment shown in FIG. 1 is provided so that it may protrude below from the carrier 10. As shown in FIG.
The diameter of the optical fiber cable 31 is, for example, about 2 mm, so that the narrow portion of the wing groove 5 can also be used.

The observation unit 40 according to some embodiments is for observing an observation target area, that is, a light irradiation area inside the blade groove by the light irradiation unit 30, and is, for example, an insertion unit 41 of the video scope 4.
For example, since the insertion portion 41 has a diameter of about 4 mm, the insertion portion 41 can also be used as a narrow portion of the wing groove 5.
The observation unit 40 according to some embodiments includes an imaging unit (not shown) including an imaging device inside the vicinity of the distal end portion 42. The observation unit 40 of some embodiments is fixed to the holder 100. The observation unit 40 of the embodiment shown in FIG. 1 is provided to project downward from the carrier 10.
Moreover, the light irradiation part 30 and the observation unit 40 of one Embodiment shown in FIG. 1 are located below rather than the virtual plane P containing central-axis AX1 of the two rollers 20. As shown in FIG.

  The holder 100 according to some embodiments is a holder that holds the light irradiation unit 30 and the observation unit 40. Also, the holder 100 of some embodiments holds the mirror 35. The holder 100 of the embodiment shown in FIG. 1 is disposed such that the projection position on the virtual plane P including the central axes AX1 of the two rollers 20 is located between the two rollers 20 as described above Are fixed to the fixing portion 11 of the carrier 10. The structure of the holder 100 will be described in detail later.

As described above, in the blade groove observation device 1 according to the embodiment, the light irradiation unit 30 and the observation unit 40 are located below the plane P described above. The blade groove observation device 1 can be arranged on the rotor disk 2 so as to be inserted into the This eliminates the need for the inspector to hold the light irradiation unit 30 and the observation unit 40 by hand, thereby improving the workability of the blade groove inspection.
In addition, even when the light emitting unit 30 and the observation unit 40 are inserted into the wing groove 5, the wing groove observation device 1 is moved along the wing groove 5 by the roller 20 at the lower part of the carrier 10. As a result, the blade groove inspection can be performed efficiently.

  Further, in the blade groove observation device 1 of one embodiment, since the holder 100 is positioned between the two rollers 20, the blade groove observation device 1 is mounted on the rotor disk 2 so that the two rollers 20 contact the rotor disk 2. By arranging them, the position of the holder 100 relative to the rotor disk 2 is stabilized. Thus, inspection can be performed in a state in which the postures of the light irradiation unit 30 and the observation unit 40 are stable with respect to the rotor disk 2.

The guide roller 50 of the embodiment shown in FIG. 1 is a guide portion configured to guide the carrier 10, that is, the blade groove observation device 1 along the blade groove 5 as described later. The guide roller 50 is a taper roller having a tapered surface 52 formed so that the diameter decreases from the center in the width direction toward the end. The guide roller 50 is formed with a protrusion 51 protruding in the radial direction at the center in the width direction. The width of the projection 51 is narrower than the width of the opening 2a on the outer peripheral surface of the rotor disk 2 as shown in FIG. 1 (b).
The guide roller 50 is two taper rollers having rotation axes parallel to each other with the two rollers 20 interposed therebetween. The guide roller 50 is rotatably provided below the carrier 10 with respect to the carrier 10. Each rotation axis of the guide roller 50 is parallel to the rotation axis 21 of the roller 20.

  An adjustment mechanism is provided to adjust the vertical position of the guide roller 50 so that the positional relationship between the roller 20 and the guide roller 50 in the vertical direction can be changed according to the outer diameter of the rotor disk 2 to be inspected. May be Further, a plurality of blade groove observation devices 1 having different positional relationships in the vertical direction between the roller 20 and the guide roller 50 may be prepared.

  The magnet 60 of the embodiment shown in FIG. 1 is disposed below the carrier 10 so that the magnetic lines of force are distributed downward of the carrier 10. That is, the magnet 60 is for pressing the blade groove observation device 1 against the rotor disk 2 by the attraction force of the magnetic force for preventing the blade groove observation device 1 from falling off from the rotor disk 2. In one embodiment, the magnets 60 are provided in the vicinity of the two guide rollers 50 respectively. The magnet 60 may be a permanent magnet or an electromagnet. Further, an adjustment mechanism may be provided to adjust the distance between the magnet 60 and the rotor disk 2.

(Holder 100)
FIG. 3 is a perspective view of the holder 100 of the wing groove observation apparatus 1, 1 </ b> A according to some embodiments. FIG. 4 is a perspective view of the holder 100 according to some embodiments with the light irradiation unit 30 and the observation unit 40 attached. FIG. 5 is a perspective view of the lower portion of the holder 100 according to some embodiments.
For convenience of description, in the direction in which the frame 110 described below extends, a direction perpendicular to the vertical direction is referred to as the width direction of the frame 110. In the following description, the width direction of the frame 110 may be simply referred to as the width direction.

  The holder 100 according to some embodiments includes a frame 110, an observation unit holding unit 120, a fixing unit 130, a moving frame 140, and a moving frame elevating unit 150.

(Frame 110)
The frame 110 is a frame-like member having a rectangular shape, and is attached to the upper side portion 111, two side portions 112 extending downward from the upper side portion 111, and a lower portion of the side portion 112. And a pivot plate portion 115.

The upper side portion is a portion corresponding to the upper side of the frame 110 and extends in the width direction of the frame 110. The upper side portion 111 is provided with a hole 111 a through which the light irradiation unit 30 is inserted and a hole 111 b through which the lower end of the observation unit holding unit 120 is inserted.
The side portion 112 is a portion corresponding to the side of the frame 110 provided apart in the width direction of the frame 110, and extends in the vertical direction. Each of the side portions 112 is provided with a holding portion 113 for holding the light emitting portion 30 in a state where the tip 32 of the light emitting portion 30 is directed downward. The lower end of the side portion 112 rotatably holds a rotating plate portion 115 described next.
To the side portion 112, pins 114 projecting outward in the width direction of the frame 110 are attached.

The rotating plate portion 115 is a member corresponding to the lower side of the frame 110, and extends in the width direction of the frame 110. As shown in FIGS. 4 and 8, the mirror 35 is attached to the upper surface of the rotating plate portion 115. The pivot plate portion 115 is held at the lower end of the side portion 112 so as to be pivotable about an axis AX2 shown in FIG. 5 along the width direction of the frame 110. That is, the rotating plate portion 115 rotatably holds the mirror 35 (see FIGS. 4 and 8) around an axis AX2 along the width direction of the frame 110.
In addition, the mirror 35 is for guiding the light irradiated from the light irradiation part 30 to a light irradiation area.

The pivot plate portion 115 has protrusions 115 a that protrude outward in the width direction from both ends in the width direction of the frame 110 at a position eccentric to the axis AX 2.
One end of a tension coil spring 116 is locked to the protrusion 115 a. The other end of the tension coil spring 116 is locked to the pin 114 of the side portion 112 of the frame 110.

(Observation unit holder 120)
The observation unit holding portion 120 is a hollow shaft-like member extending in the vertical direction, and fixes the observation unit 40 inserted therein. The observation unit 40 is fixed to the observation unit holding portion 120 in a state of protruding downward from the lower end of the observation unit holding portion 120 as shown in FIGS. 4 and 8.
The lower end of the observation unit holder 120 is inserted into the hole 111 b of the upper side 111 and fixed to the upper side 111. A male screw portion 121 is provided on the outer peripheral surface of the upper portion of the observation unit holding portion 120.

(Fixing part 130)
The fixing portion 130 is a member connected to the upper side portion 111 above the frame 110 via the connecting shaft portion 135, and the hole portion 131 through which the light irradiation portion 30 is inserted and the moving frame lifting portion 150 described later And a hole 132 to be inserted. In the blade and groove observation device 1 of the embodiment, the fixing portion 130 is fixed to the fixing portion 11 of the carrier 10 as shown in FIGS. 1 and 2.
In addition, the insertion depth to the wing groove 5 of the holder 100 lower part can be changed by changing the height position of the fixing | fixed part 130 with respect to the fixing | fixed part 11 of the carrier 10. FIG.

(Movement frame 140)
The moving frame 140 includes an upper side portion 141 extending in the width direction of the frame 110 and side side portions 142 separately provided in the width direction of the frame 110 and extending downward from both ends of the upper side portion 141. Have. The moving frame 140 is disposed such that the upper side 141 is located above the upper side 111 of the frame 110 and the side 142 is located outside the side 112 of the frame 110. The upper side 141 is provided with a hole 141a through which the light irradiation unit 30 is inserted, a hole 141b through which the lower end of the observation unit holding unit 120 is inserted, and a hole 141c through which the connecting shaft 135 is inserted. ing.

(Moving frame elevator 150)
The moving frame elevating part 150 is a hollow shaft-like member extending in the vertical direction, and the observation unit holding part 120 is inserted inside. On the inner peripheral surface of the upper portion of the moving frame elevating part 150, a female screw part (not shown) coupled with the male screw part 121 of the observation unit holding part 120 is provided. At an upper portion of the moving frame elevating unit 150, a knob portion 152 for rotating the moving frame elevating unit 150 around an axis is provided.
The lower end of the movable frame elevating unit 150 is rotatably coupled to the upper side portion 141 of the movable frame 140.

In the holder 100 according to some embodiments configured as described above, as illustrated in FIGS. 4 and 8, the light irradiation unit 30 includes the hole 131 of the fixed unit 130 and the hole of the upper side 141 of the moving frame 140. The tip end portion is held by the holding portion 113 in a state where the tip end 32 is directed downward through the hole portion 111 a of the upper side portion 111 of the portion 141 a and the frame body 110.
The tip 32 of the light irradiation unit 30 is disposed at a position facing the mirror 35. The ultraviolet light emitted by the ultraviolet light emitting device 3 (see FIGS. 1 and 8) is configured to be irradiated from the tip 32 of the light emitting unit 30 toward the mirror 35.
That is, in some embodiments, the holder 100 includes a frame 110 that holds at least the mirror 35 at the lower portion of the holder 100. Also, in some embodiments, the mirror 35 extends along a plane rotated about the axis AX2 with respect to the extending surface of the frame 110 to reflect light from above from the light emitting unit 30. Configured to

  In the holder 100 according to some embodiments, the observation unit 40 is fixed to the observation unit holding unit 120 in a state of projecting downward from the lower end of the observation unit holding unit 120. An optical adapter 43 for observing the side is attached to the distal end portion 42 of the observation unit 40.

  The holder 100 according to the embodiment is fixed to the carrier 10 by fixing the fixing portion 130 to the fixing portion 11 of the carrier 10 as shown in FIGS. 1 and 2.

(About change of reflection angle of mirror 35)
The mirror 35 reflects the ultraviolet light emitted from the tip 32 of the light irradiation unit 30. Further, as described above, the mirror 35 is rotatably held by the rotation plate portion 115 around an axis AX2 (see FIG. 5) along the width direction of the frame 110. Therefore, by changing the rotational position of the mirror 35, the reflection angle of the ultraviolet light from the tip 32 of the light emitting unit 30 can be changed. Hereinafter, a method of changing the reflection angle of the mirror 35 will be described.

FIG. 6 is a schematic view for explaining the method of changing the reflection angle of the mirror 35, and is a view of the mirror 35 and the rotating plate portion 115 as seen from the width direction of the frame 110.
As shown in FIG. 5, the pivoting plate portion 115 is held at the lower end of the side portion 112 so as to be pivotable about the axis AX 2, and the projection 115 a is attached upward by the biasing force of the tension coil spring 116. It is powered. Therefore, as shown in FIG. 6A, the pivoting plate portion 115 is biased in the counterclockwise direction as shown by an arrow 91a around the axis AX2. When the pivoting plate portion 115 pivots in the counterclockwise direction in the figure, the projection 115a abuts on the tip end portion 142a of the side portion 142 of the movable frame 140 or as shown in FIG. The contact with the tip end portion 112 a of the portion 112 is regulated.

As described above, the internal thread portion (not shown) of the inner peripheral surface of the upper portion of the movable frame lifting portion 150 is coupled to the external thread portion 121 of the observation unit holding portion 120. Further, the lower end of the observation unit holder 120 is fixed to the upper side 111 of the frame 110.
Therefore, when the inspector grips the knob 152 of the movable frame elevator 150 and rotates the movable frame elevator 150 around the axis, the movable frame elevator 150 moves with respect to the observation unit holder 120, that is, moves The frame lifting unit 150 moves up and down with respect to the frame 110.
As described above, the lower end of the movable frame elevating unit 150 is rotatably coupled to the upper side portion 141 of the movable frame 140. Therefore, when the moving frame lifting unit 150 moves in the vertical direction with respect to the frame 110, the side portion 142 of the moving frame 140 moves in the vertical direction with respect to the frame 110.

For example, as shown in FIG. 6 (b), the movable frame lifter 150 is pivoted about the axis from the state shown in FIG. 6 (a) to the frame 110 (not shown in FIG. 6). The side portion 142 of the moving frame 140 can be moved downward, as indicated by the arrow 91 b. As a result, the pivoting plate portion 115 and the mirror 35 pivot in the clockwise direction as shown by the arrow 91 c around the axis AX2 against the biasing force of the tension coil spring 116 (not shown) in FIG.
In addition, by moving the movable frame elevating unit 150 around the axis in the direction opposite to the above rotation direction, the side portion 142 of the movable frame 140 is moved upward with respect to the frame 110 (not shown). It can be done. Thus, the pivoting plate portion 115 and the mirror 35 pivot in the counterclockwise direction around the axis AX2 by the biasing force of the tension coil spring 116 (not shown) in FIG.
In some embodiments, the angle of reflection of mirror 35 can be changed in this way. That is, in some embodiments, the drive mechanism 80 including the observation unit holding unit 120, the moving frame 140, and the moving frame elevating unit 150 is configured, and the rotation plate unit 115 is rotated about the axis AX2. Let

(About UV cut filter)
The blade and groove observation devices 1 and 1A according to some embodiments are used for magnetic powder flaw detection using fluorescent magnetic powder. In the blade and groove observation devices 1 and 1A according to some embodiments, the presence or absence of light emission of the fluorescent magnetic powder due to the ultraviolet light irradiated from the light irradiation unit 30 is confirmed by observing the image displayed on the monitor of the videoscope 4 . At this time, since the image displayed on the monitor of the video scope 4 turns purple due to the ultraviolet light, it may be difficult to confirm the presence or absence of the light emission of the fluorescent magnetic powder.
Thus, in some embodiments, an ultraviolet cut filter is provided at the distal end portion 42 of the insertion portion 41 in order to suppress the ultraviolet light incident on the imaging element inside the insertion portion 41 of the video scope 4. FIG. 7 is a view schematically showing a state in which the ultraviolet cut filter is provided at the distal end portion 42 of the insertion portion 41. As shown in FIG.
In some embodiments, as shown in FIG. 7, the ultraviolet cut filter 45 is sandwiched between the tip 42 of the insertion portion 41 and the optical adapter 43.
As a result, since the ultraviolet ray cut filter 45 can suppress ultraviolet rays incident on the imaging device inside the insertion portion 41, it is possible to clearly confirm the emission of fluorescent magnetic powder in the image displayed on the monitor of the video scope 4.

(About the brake system)
In the blade and groove observation device 1 according to one embodiment, the carrier 10 includes a brake device 70 capable of inhibiting the rotation of the roller 20 described below.

With reference to FIGS. 9-11, the brake apparatus 70 in the wing groove observation apparatus 1 of one Embodiment is demonstrated.
9 and 11 are cross-sectional views schematically showing the structure of the brake device 70. FIG. FIG. 10 is a perspective view of the roller 20A whose rotation is prohibited by the brake device 70. As shown in FIG. In one embodiment, the braking device 70 generates a braking force on one of the two rollers 20. The brake disc 23 is attached to the rotating shaft 21 at the roller 20A. The brake disc 23 is provided with a plurality of irregularities on the outer peripheral portion.

As shown in FIGS. 9 and 11, the brake device 70 includes a brake shoe 71, a brake plate 72, and a biasing spring 73.
The brake shoe 71 is a member for generating a braking force by being pressed against the outer peripheral surface of the brake disc 23, and is made of, for example, a material such as urethane.
The brake plate 72 is a plate-like member in which the brake shoe 71 is attached to the lower surface. Two shaft portions 74 extending upward are attached to the upper surface of the brake plate 72. The two shaft portions 74 are supported movably in the vertical direction with respect to the carrier 10 via the linear motion guide 75.

  The brake plate 72 is biased downward by the biasing force of the biasing spring 73. Therefore, the brake shoe 71 attached to the lower surface of the brake plate 72 presses the outer peripheral surface of the brake disc 23 by the biasing force of the biasing spring 73. Thus, the rotation of the roller 20A is prohibited.

  A grip lever 77 for releasing the brake of the brake device 70 is attached to the upper portion of the two shaft portions 74 via an arm portion 76. When the grip portion 12 (see FIG. 1) for handling the wing groove observation device 1 is gripped and the grip lever 77 is pulled upward, as shown in FIG. 11, the arm portion 76 and the two shaft portions 74 The brake plate 72 coupled to the grip lever 77 via the pressure lever 73 is pulled upward against the biasing force of the biasing spring 73. As a result, the brake shoe 71 is pulled upward and separated from the outer peripheral surface of the brake disc 23, so that the brake is released.

(On the blade groove observation method using the blade groove observation device 1, 1A)
By using the blade and groove observation devices 1 and 1A according to some embodiments configured as described above, the blade groove 5 can be inspected as follows.
FIG. 12 is a flowchart showing a general flow of a blade groove observation method performed using the blade groove observation devices 1 and 1A according to some embodiments. The wing groove observation method according to some embodiments is a wing groove observation method for observing the inside of the wing groove 5 of the rotor disk 2 using the wing groove observation device 1 or 1A, and the insertion step S1 and the observation step S2 And

The inserting step S1 is a step of inserting at least the light emitting unit 30 and the observation unit 40 into the wing groove 5.
Specifically, the lower portion of the holder 100 is inserted into the wing groove 5 after the fluorescent magnetic powder is attached. In the blade groove observation device 1 of one embodiment shown in FIG. 1, when the roller 20 is brought into contact with the outer peripheral surface of the rotor disk 2 as shown in FIG. Be inserted. At this time, in the blade groove observation device 1 according to the embodiment, the blade groove observation device 1 is pressed against the rotor disk 2 by the attraction force of the magnetic force of the magnet 60. That is, the blade groove observation device 1 can be attached to the rotor disk 2 by the magnetic force of the magnet 60. Thus, even if the blade groove observation device 1 is moved downward along the circumferential direction of the rotor disk 2, the blade groove observation device 1 can be prevented from falling off the rotor disk 2, so that the blade groove observation device 1 It becomes easy to move along the circumferential direction of the disk 2, and the workability of the blade groove inspection improves.

Further, in the blade groove observation device 1 of the embodiment shown in FIG. 1, when the roller 20 is brought into contact with the outer peripheral surface of the rotor disk 2 as shown in FIG. Contact the surface. Specifically, in the guide roller 50, the tapered surface 52 is in contact with the opening 2a of the outer peripheral surface of the rotor disk 2, and the protrusion 51 enters the inside of the rotor disk 2 in the radial direction from the opening 2a.
Since the tapered surface 52 is in contact with the opening 2a of the outer peripheral surface of the rotor disk 2, when moving the blade groove observation device 1 along the circumferential direction of the rotor disk 2, the guide roller 50 extends the opening 2a. The blade groove observation device 1 is guided along the circumferential direction of the existing rotor disk 2. That is, when the center in the width direction of the guide roller 50 deviates from the center in the width direction of the opening 2a, the contact pressure at the two contact portions between the opening 2a and the tapered surface 52 is different. A force acts on 50 to reduce the above-mentioned deviation.
As a result, the blade groove observing device 1 can be stably moved along the blade groove 5, so that the workability of the blade groove inspection is improved.
In addition, since the projection 51 enters radially inward from the opening 2a, deflection of the projection 51 from the opening 2a in the thickness direction of the rotor disk 2, ie, in the axial direction of the turbine rotor, is suppressed. Ru. The thickness direction of the rotor disk 2, that is, the axial direction of the turbine rotor is the left-right direction in FIG. 1 (b).

In the blade groove observation device 1 of the embodiment shown in FIG. 1, when the blade groove observation device 1 is placed on the outer peripheral surface of the rotor disk 2, the rotation of the roller 20A is prohibited by the brake device 70 described above. As a result, the blade groove observation device 1 can be prevented from unintentionally moving along the circumferential direction of the rotor disk 2 by gravity, so that the workability of the blade groove inspection is improved.
When the inspector grips the grip portion 12 and pulls up the grip lever 77, the brake of the brake device 70 is released as described above. It can be freely moved along the outer peripheral surface of the.
As described above, the inspector can release the brake of the brake device 70 by holding the grip 12 in order to move the blade groove observation device 1 along the circumferential direction of the rotor disk 2, so that the workability of the blade groove inspection is improves.

  In the blade and groove observation device 1A according to the other embodiment shown in FIG. 8, the inspector holds the blade and groove observation device 1A and inserts the lower portion of the holder 100 into the wing groove 5. After inserting the lower part of the holder 100 into the inside of the wing groove 5, if the wing groove observation device 1A is fixed to the rotor disk 2 by using a magnet base etc., the inspector hands the wing groove observation device 1A by hand. There is no need to have Even if the magnet base or the like is not used, the inspector can hold the wing groove observation device 1A with one hand, so the other hand is free. Therefore, by using the blade and groove observation device 1A according to the other embodiment shown in FIG. 8, the workability of the blade and groove inspection is improved.

Then, the observation step S2 is performed. In the observation step S 2, while the light irradiation unit 30 and the observation unit 40 are inserted into the wing groove 5, the light irradiation unit 30 emits light to the wing groove 5 while the light irradiation area in the wing groove 5 is irradiated. Is observed by the observation unit 40.
At this time, by changing the reflection angle of the mirror 35 as described above, the desired area in the wing groove 5 can be irradiated with the ultraviolet light from the light irradiation unit 30.

In the T-root type blade groove 5, a crack is likely to be generated at a radially outer corner portion of the blade groove 5 surrounded by a circle C of a broken line in FIG. 1 (b). However, light is emitted downward from the light irradiator 30, that is, radially inward of the rotor disk 2, with the light irradiator 30 inserted in the wing groove 5 from the opening 2 a on the outer peripheral surface of the rotor disk 2. Then, it is difficult for the light to reach the radially outer corner portion of the wing groove 5.
In that respect, in some embodiments, the light from above from the light emitting unit 30 is reflected by the mirror 35, so that the light can easily reach the radially outer corner portion of the wing groove 5. As a result, it becomes easy to observe the part where the crack is likely to occur, so the workability of the blade groove inspection is improved.
Further, in some embodiments, the rotation angle of the light from the light irradiation unit 30 by the mirror 35 from the upper side by the mirror 35 by rotating the rotation plate unit 115 around the axis AX2 along the width direction of the frame 110 Since it can be adjusted, light can be efficiently irradiated to the area to be observed.

  In some embodiments, since the emission of the fluorescent magnetic powder can be confirmed by the image displayed on the monitor of the video scope 4, the burden on the inspector is reduced. Further, since the image displayed on the monitor of the video scope 4 can be observed by a plurality of persons, it is possible to suppress the oversight of flaws. By using the video scope 4, the image storage function of the video scope 4 can be used, which contributes to the storage of examination records.

Then, the circumferential direction position in the rotor disk 2 of blade groove observation apparatus 1 and 1A is changed suitably, and observation in the blade groove 5 is performed.
As described above, according to the blade groove observation method using the blade groove observation device 1 or 1A, the blade groove 5 of the rotor disk 2 is obtained using any of the blade groove observation devices 1 or 1A according to some embodiments. Since the inside is observed, the inspector does not have to hold the light irradiation unit 30 and the observation unit 40 by hand, and the workability of the blade groove inspection is improved.

  Moreover, observation of the wing groove 5 becomes easy by using the wing groove observation apparatus 1 and 1A which concerns on some embodiment, and can overlook oversight of the flaw of the wing groove 5. FIG.

The present invention is not limited to the above-described embodiments, and includes the embodiments in which the above-described embodiments are modified, and the embodiments in which these embodiments are appropriately combined.
For example, the light irradiator 30 of the above-described embodiments is an optical fiber cable 31 that guides the ultraviolet light emitted by the ultraviolet light emitting device 3 and irradiates the light within the wing groove 5. However, instead of holding the optical fiber cable 31 by the holder 100, a light source such as a light emitting diode that emits ultraviolet light may be disposed under the frame 110.

  The observation unit 40 of the several embodiments described above is the insertion portion 41 of the video scope 4. However, instead of holding the insertion portion 41 of the video scope 4 by the holder 100, a small imaging unit having an imaging element may be disposed under the frame 110.

  Although two guide rollers 50 are provided in the blade and groove observation device 1 according to the embodiment described above, at least one guide roller 50 may be provided. In addition, it is not essential to form the protrusion 51 on the guide roller 50. Further, instead of providing the roller 20 and the guide roller 50, a roller having the functions of the roller 20 and the guide roller 50 may be provided.

  In the blade groove observation device 1 of the embodiment described above, the guide roller 50 is provided to guide the carrier 10 along the blade groove 5. However, the configuration for guiding the carrier 10 along the wing groove 5 is not limited to the guide roller 50. For example, instead of the guide roller 50, a shaft-like member or a plate-like member may be provided so as to protrude downward of the carrier 10 and be inserted into the wing groove 5. Even with such a configuration, the blade groove observation device 1 can be stably moved along the blade groove 5, so that the workability of the blade groove inspection is improved.

  In the blade and groove observation device 1 of the embodiment described above, the brake device 70 generates a braking force on one of two rollers. However, the brake device 70 may be configured to generate a braking force for each of the two rollers.

1, 1 A wing groove observation device 10 carrier 12 grip portion 20 roller 30 light irradiation portion 35 mirror 40 observation unit 50 guide roller 60 magnet 70 brake device 77 grip lever 80 drive mechanism 100 holder 110 frame body 115 pivot plate portion

Claims (12)

With the carrier,
Two rollers, each having a rotational axis parallel to one another and rotatably mounted relative to the carrier at the bottom of the carrier;
A light irradiator provided to project downward from the carrier;
An observation unit provided so as to project downward from the carrier, and observing a light irradiation area inside the blade groove by the light irradiation unit;
The blade and groove observation device is characterized in that the light emitting unit and the observation unit are positioned below a plane including central axes of the two rollers. And a holder fixed to the carrier and holding the light emitting unit and the observation unit.
The blade and groove observation device according to claim 1, wherein the holder is disposed and fixed to the carrier such that a projected position on the plane is located between the two rollers. The wing groove observation apparatus according to claim 1, further comprising a guide portion configured to guide the carrier along the wing groove. The wing groove observation device according to claim 3, wherein said guide part is a guide roller formed so that a diameter may become small as it goes to the end from the center of the cross direction. The blade and groove observation device according to any one of claims 1 to 4, wherein the carrier includes a magnet arranged such that magnetic lines of force are distributed downward of the carrier. The blade and groove observation device according to any one of claims 1 to 5, wherein the carrier includes a brake device capable of inhibiting rotation of at least one of the rollers. The wing groove observation device according to claim 6, wherein the carrier includes a grip portion having a grip lever for releasing the brake of the brake device. A mirror for guiding light emitted from the light emitting unit to the light emitting area;
And a holder fixed to the carrier and holding the light emitting unit, the mirror, and the observation unit.
The holder includes a frame holding at least the mirror at a lower portion of the holder,
The mirror extends along a plane rotated with respect to the extending surface of the frame around an axis along the width direction of the frame, and reflects light from above from the light emitting unit The blade and groove observation device according to any one of claims 1 to 7, which is configured as described above. The frame has a pivoting plate portion that rotatably holds the mirror around an axis along the width direction of the frame.
The blade groove observation device according to claim 8, further comprising: a drive mechanism for pivoting the pivoting plate portion around an axis along the width direction of the frame. A light irradiator,
A mirror for guiding the light irradiated from the light irradiation unit to an observation target area inside the blade groove;
An observation unit for observing the observation target area;
And a holder for holding the light emitting unit, the mirror, and the observation unit.
The holder includes a frame holding at least the mirror at a lower portion of the holder,
The mirror extends along a plane rotated with respect to the extending surface of the frame around an axis along the width direction of the frame, and reflects light from above from the light emitting unit A wing groove observation device characterized in that it is constituted. The frame has a pivoting plate portion that rotatably holds the mirror around an axis along the width direction of the frame.
The blade groove observation device according to claim 10, further comprising: a drive mechanism for rotating the rotating plate portion around an axis along the width direction of the frame. A blade groove observation method for observing the inside of a blade groove of a rotor disk using the blade groove observation device according to any one of claims 1 to 11,
Inserting at least the light emitting unit and the observation unit into the wing groove;
In the state where the light irradiation unit and the observation unit are inserted into the inside of the blade groove, the light irradiation area inside the blade groove is irradiated with the observation unit while the light is irradiated from the light irradiation unit to the inside of the blade groove. Observing steps,
A method of observing a wing groove, comprising:

Images