JP6334047B1 - Blade groove observation apparatus and blade groove observation method - Google Patents

Abstract

To improve workability of blade groove inspection. A blade groove observing device includes a carrier, two rotation shafts parallel to each other, two rollers provided below the carrier so as to be rotatable with respect to the carrier, and protruding downward from the carrier. A light irradiating unit provided so as to protrude downward from the carrier, and an observation unit for observing a light irradiating area inside the blade groove by the light irradiating unit, and the light irradiating unit The observation unit is located below a plane including the central axis of the two rollers. [Selection] Figure 1

Description

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

In a turbine such as a gas turbine or a steam turbine, a turbine blade is attached to a rotor disk in a state where a blade root portion of the turbine blade is inserted into a blade groove for fixing the turbine blade formed on the outer peripheral surface of the rotor disk of the turbine rotor. It is fixed.
For example, since a turbine rotor of a steam turbine is operated under a high temperature condition, when used for a long time, cracks due to stress corrosion cracking or the like may occur in portions subjected to stress. For this reason, periodic inspections are performed to inspect the presence and size of cracks in each part of the turbine rotor.
As a method for inspecting the presence or absence and the size of defects such as cracks generated in the turbine rotor, for example, magnetic particle flaw detection can be cited (see Patent Document 1).

JP 2003-294716 A

  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 on the outer peripheral surface of the rotor disk is narrower than the width inside the blade groove. Therefore, when inspecting the inside of a T-route type blade groove by magnetic particle flaw detection, an inspector uses a small mirror for observing a part that cannot be directly visually recognized from the outside and an ultraviolet lamp for emitting fluorescent magnetic powder. I was carrying out an inspection. For this reason, it may be difficult to confirm depending on the part of the blade groove, and both hands are blocked by a mirror and an ultraviolet lamp.

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

(1) A blade groove observation device according to at least one embodiment of the present invention is:
Career,
Two rollers each having a rotation axis parallel to each other and provided below the carrier so as to be rotatable with respect to the carrier;
A light irradiation unit provided so as to protrude downward from the carrier;
An observation unit provided so as to protrude downward from the carrier, and for observing the light irradiation area inside the blade groove by the light irradiation unit,
The light irradiation unit and the observation unit are located below a plane including the central axis of the two rollers.

According to the configuration of (1) above, the light irradiation unit and the observation unit are positioned below the plane including the central axis of the two rollers, so that the light irradiation unit and the observation unit are inserted into the blade groove. In addition, the blade groove observation device can be arranged on the rotor disk. This eliminates the need for the inspector to hold the light irradiator and the observation unit by hand, thereby improving the workability of blade groove inspection.
In addition, even if the light irradiation unit and the observation unit are inserted in the blade groove, the blade groove observation device can be moved along the blade groove by the roller below the carrier. The blade groove inspection can be performed efficiently.

(2) In some embodiments, in the configuration of (1) above,
A holder that is fixed to the carrier and holds the light irradiation unit and the observation unit;
The holder is disposed so that a projection position on the plane is located between the two rollers, and is fixed to the carrier.

  According to the configuration of (2) above, since the holder is positioned between the two rollers, the blade groove observation device is arranged with respect to the rotor disk so that the two rollers are in contact with the rotor disk. The position of the holder with respect to is stabilized. Thereby, it can test | inspect in the state in which the attitude | position of the light irradiation part and the observation unit was stabilized with respect to the rotor disk.

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

  According to the configuration of (3) above, since the blade groove observation 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 from the center in the width direction toward the end.

  According to the configuration of (4) above, since the blade groove observation 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 above configurations (1) to (4), the carrier includes a magnet disposed so that lines of magnetic force are distributed toward the lower side of the carrier.

  According to the configuration of (5) above, since the blade groove observation device can be attached to the rotor disk by the magnetic force of the magnet, even if the blade groove observation device is moved downward along the circumferential direction of the rotor disk, the blade groove 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 is improved.

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

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

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

  According to the configuration of (7) above, since the inspector can release the brake of the brake device by moving the blade groove observation device along the circumferential direction of the rotor disk, the brake device brake can be released. Improves.

(8) In some embodiments, in any one of the above configurations (1) to (7),
A mirror for guiding the light irradiated from the light irradiation unit to the light irradiation area;
A holder that is fixed to the carrier and holds the light irradiation unit, the mirror, and the observation unit, and
The holder includes a frame that holds 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 body around an axis along the width direction of the frame body, and reflects light from above from the light irradiation unit. Configured as follows.

In the T root type blade groove, cracks are likely to occur at the corners on the radially outer side of the blade groove. However, when light is irradiated from the light irradiator downward from the opening on the outer peripheral surface of the rotor disk into the blade groove, that is, radially inward of the rotor disk, the blade groove It is difficult for light to reach the corners on the outside in the radial direction.
In that respect, according to the configuration of (8) above, light from above from the light irradiating portion is reflected by the mirror, so that light easily reaches the corner portion on the radially outer side of the blade groove. Thereby, since it becomes easy to observe the part which is easy to produce a crack, the workability | operativity of a blade groove inspection improves.

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

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

(10) A blade groove observation apparatus according to at least one embodiment of the present invention is:
A light irradiation unit;
A mirror for guiding the light emitted from the light irradiation unit to an observation target area inside the blade groove;
An observation unit for observing the observation target area;
A holder for holding the light irradiation unit, the mirror and the observation unit,
The holder includes a frame that holds 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 body around an axis along the width direction of the frame body, and reflects light from above from the light irradiation unit. Configured as follows.

According to the configuration of (10) above, if the holder is inserted into the blade groove so that the light irradiation unit, the mirror, and the observation unit are located inside the blade groove, the inspector manually holds the light irradiation unit and the observation unit. This eliminates the need to hold the wing groove, thus improving the workability of the blade groove inspection.
In addition, since the light from above from the light irradiation part is reflected by the mirror, the light easily reaches the corner portion on the radially outer side of the blade groove. As a result, it is easy to observe the corner portion on the radially outer side of the blade groove, which is a portion where cracks are likely to occur as described above, and the workability of the blade groove inspection is improved.

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

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

(12) The blade groove observation method according to at least one embodiment of the present invention includes:
A blade groove observation method for observing the inside of a blade groove of a rotor disk using the blade groove observation device having any one of the above configurations (1) to (11),
Inserting at least the light irradiation unit and the observation unit into the blade groove;
While irradiating light from the light irradiation unit to the inside of the blade groove with the light irradiation unit and the observation unit being inserted into the blade groove, the light irradiation area inside the blade groove is adjusted by the observation unit. Observing.

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

  According to at least one embodiment of the present invention, the workability of blade groove inspection can be improved.

It is the typical figure showing the external appearance of the blade 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 a wing groove observation device concerning one embodiment. It is a perspective view of the holder of the blade groove observation device of some embodiments. It is a perspective view of a holder concerning some embodiments in the state where a light irradiation part and an observation unit were attached. It is a perspective view of the lower part of the holder which concerns on some embodiment. 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 controlled by the front-end | tip part of the side part of a moving frame, (b) Shows a state in which the tip of the side portion is lower than (a). It is a figure which shows typically the state which provided the ultraviolet-ray cut filter in the front-end | tip part of the insertion part. It is a perspective view of the external appearance of the blade groove observation apparatus which concerns on other embodiment. It is sectional drawing which shows the structure of a brake device typically. It is a perspective view of the roller for which rotation is prohibited by a brake device. It is sectional drawing which shows the structure of a brake device typically. It is a flowchart which shows the general | schematic flow of the blade groove | channel observation method performed using the blade groove | channel 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 in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
For example, expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.

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

  A blade groove observation device 1, 1 </ b> A according to some embodiments shown in FIGS. 1 and 8 is for inspecting a blade groove formed on the outer peripheral surface of a rotor disk of a turbine rotor in a turbine such as a gas turbine or a steam turbine. Device. The blade groove observing apparatus 1, 1 </ b> A according to some embodiments described below can be used for inspection of a narrow portion such as a T-route type blade groove.

  A blade groove observation apparatus 1 according to an embodiment shown in FIG. 1 includes a carrier 10, two rollers 20, a light irradiation unit 30, and an observation unit 40. The blade groove observation apparatus 1 according to the embodiment shown in FIG. 1 includes a guide roller 50 and a magnet 60. A blade groove observation apparatus 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 blade groove observation apparatus 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 will be described later, in a 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 It faces in the same direction as the radial direction of the rotor disk. The upper direction of the blade groove observation devices 1 and 1A faces the outer side in the radial direction of the rotor disk, and the lower direction of the blade groove observation devices 1 and 1A faces the inner side in the radial direction of the rotor disk.

In the blade groove observation apparatus 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. The carrier 10 is provided with a fixing portion 11 to which the holder 100 is fixed at the top of the carrier 10.
The carrier 10 has a grip portion 12 for handling the blade groove observation device 1. The holding part 12 has a holding lever 77 for releasing the brake of the brake device, which will be described later.

In addition, the carrier 10 is provided with two rollers 20 each having a rotation shaft 21 parallel to each other across the fixed portion 11 so as to be rotatable with respect to the carrier 10.
Each of the two rollers 20 has tires 22 attached to both ends of the rotating shaft 21 (see FIG. 1B). The tire 22 is made of an elastic material such as urethane or rubber.

The light irradiation unit 30 of some embodiments is for irradiating light, and is, for example, an optical fiber cable 31 that guides the ultraviolet light emitted from the ultraviolet light emitting device 3 and irradiates it in the blade groove 5. The light irradiation unit 30 of some embodiments is fixed to the holder 100. In addition, the light irradiation part 30 of one Embodiment shown in FIG.
Since the optical fiber cable 31 has a diameter of about 2 mm, for example, it can be used even in a narrow portion of the blade groove 5.

The observation unit 40 of some embodiments is for observing the observation target area, that is, the light irradiation area inside the blade groove by the light irradiation unit 30, for example, the insertion unit 41 of the video scope 4.
Since the insertion portion 41 has a diameter of about 4 mm, for example, it can be used even in a narrow portion of the blade groove 5.
The observation unit 40 of some embodiments includes an imaging unit (not shown) including an imaging element in the vicinity of the distal end portion 42. The observation unit 40 of some embodiments is fixed to the holder 100. Note that the observation unit 40 of one embodiment shown in FIG. 1 is provided so as to protrude downward from the carrier 10.
In addition, the light irradiation unit 30 and the observation unit 40 according to the embodiment illustrated in FIG. 1 are located below a virtual plane P including the central axis AX1 of the two rollers 20.

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

Thus, in the blade groove observation apparatus 1 according to one embodiment, the light irradiation unit 30 and the observation unit 40 are located below the plane P described above, and thus the light irradiation unit 30 and the observation unit 40 are located inside the blade groove 5. The blade groove observation device 1 can be disposed on the rotor disk 2 so as to be inserted into the rotor disk 2. 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.
Even if the light irradiation unit 30 and the observation unit 40 are still inserted into the blade groove 5, the blade groove observation device 1 is moved along the blade groove 5 by the roller 20 below the carrier 10. Therefore, the blade groove inspection can be performed efficiently.

  Further, in the blade groove observation device 1 according to the embodiment, the holder 100 is positioned between the two rollers 20, so the blade groove observation device 1 is attached to the rotor disk 2 so that the two rollers 20 are in contact with the rotor disk 2. The position of the holder 100 with respect to the rotor disk 2 is stabilized by disposing it. Thereby, it can test | inspect in the state with which the attitude | position of the light irradiation part 30 and the observation unit 40 was stable with respect to the rotor disk 2. FIG.

The guide roller 50 according to 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 tapered 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 has a protrusion 51 protruding in the radial direction at the center in the width direction. The width of the protrusion 51 is narrower than the width of the opening 2a on the outer peripheral surface of the rotor disk 2 as shown in FIG.
The guide roller 50 is two taper rollers each having a rotation axis parallel to each other with the two rollers 20 interposed therebetween. The guide roller 50 is provided below the carrier 10 so as to be rotatable with respect to the carrier 10. Each rotation shaft of the guide roller 50 is parallel to the rotation shaft 21 of the roller 20.

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

  The magnet 60 according to the embodiment shown in FIG. 1 is disposed at the lower part of the carrier 10 so that the lines of magnetic force are distributed toward the lower side of the carrier 10. That is, the magnet 60 is used for the blade groove observation device 1 to press the blade groove observation device 1 against the rotor disk 2 with the attraction force by the magnetic force in order to prevent the blade groove observation device 1 from falling off the rotor disk 2. In one embodiment, the magnet 60 is provided in the vicinity of the two guide rollers 50. The magnet 60 may be a permanent magnet or an electromagnet. Further, an adjusting mechanism for adjusting the distance between the magnet 60 and the rotor disk 2 may be provided.

(Holder 100)
FIG. 3 is a perspective view of the holder 100 of the blade groove observation device 1, 1A 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 thereto. FIG. 5 is a perspective view of the lower part of the holder 100 according to some embodiments.
For convenience of explanation, among the directions in which the frame 110 described below extends, the 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 body 110, an observation unit holding unit 120, a fixing unit 130, a moving frame 140, and a moving frame lifting / lowering unit 150.

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

The upper side portion is a portion corresponding to the upper side of the frame body 110 and extends in the width direction of the frame body 110. The upper side 111 is provided with a hole 111a through which the light irradiation unit 30 is inserted and a hole 111b through which the lower end of the observation unit holding unit 120 is inserted.
The side part 112 is a part corresponding to the side of the frame 110 that is 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 unit 113 that holds the light irradiation unit 30 with the tip 32 of the light irradiation unit 30 facing downward. The lower end of the side part 112 holds a rotating plate part 115 described below in a rotatable manner.
Pins 114 that protrude outward in the width direction of the frame 110 are attached to the side portions 112.

The rotating plate 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, a mirror 35 is attached to the upper surface of the rotating plate 115. The rotating plate portion 115 is held at the lower end of the side portion 112 so as to be rotatable around the axis AX2 shown in FIG. 5 along the width direction of the frame 110. That is, the rotating plate portion 115 holds the mirror 35 (see FIGS. 4 and 8) so as to be rotatable around the axis AX2 along the width direction of the frame 110.
The mirror 35 is for guiding the light irradiated from the light irradiation unit 30 to the light irradiation area.

The rotating plate 115 has a protrusion 115a that protrudes outward in the width direction from both ends in the width direction of the frame 110 at a position eccentric from the axis AX2.
One end of a tension coil spring 116 is locked to the protrusion 115a. The other end of the tension coil spring 116 is locked to the pin 114 of the side part 112 of the frame 110.

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

(Fixing part 130)
The fixing part 130 is a member connected to the upper side part 111 above the frame body 110 via a connecting shaft part 135, and includes a hole part 131 through which the light irradiation part 30 is inserted, and a moving frame elevating part 150 described later. And a hole 132 to be inserted. In the blade groove observation apparatus 1 according to the embodiment, the fixing unit 130 is fixed to the fixing unit 11 of the carrier 10 as illustrated in FIGS. 1 and 2.
In addition, the insertion depth to the blade groove | channel 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.

(Moving frame 140)
The moving frame 140 includes an upper side portion 141 that extends in the width direction of the frame body 110 and a side side portion 142 that is spaced apart in the width direction of the frame body 110 and extends downward from both ends of the upper side portion 141. Have. The moving frame 140 is arranged such that the upper side portion 141 is positioned above the upper side portion 111 of the frame body 110 and the side side portion 142 is positioned laterally outside the side side portion 112 of the frame body 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 part 135 is inserted. ing.

(Moving frame lifting part 150)
The moving frame lifting / lowering unit 150 is a hollow shaft-like member extending in the vertical direction, and the observation unit holding unit 120 is inserted therein. On the inner peripheral surface of the upper part of the moving frame lifting / lowering part 150, a female screw part (not shown) coupled to the male screw part 121 of the observation unit holding part 120 is provided. On the upper part of the moving frame lifting / lowering part 150, a knob part 152 for rotating the moving frame lifting / lowering part 150 around the axis is provided.
The lower end of the moving frame lifting / lowering part 150 is coupled to the upper side part 141 of the moving frame 140 so as to be rotatable.

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 portion is held by the holding portion 113 in a state where the tip portion 32 is inserted downward through the hole portion 111a of the upper side portion 111 of the portion 141a and the frame 110.
The tip 32 of the light irradiation unit 30 is disposed at a position facing the mirror 35. 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 irradiation 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 in the lower portion of the holder 100. In some embodiments, the mirror 35 extends along a plane rotated around the axis AX2 with respect to the extending surface of the frame 110, and reflects light from above from the light irradiation unit 30. Configured to do.

  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 protruding 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.

  As shown in FIGS. 1 and 2, the holder 100 of one embodiment is fixed to the carrier 10 by fixing the fixing portion 130 to the fixing portion 11 of the carrier 10.

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

FIG. 6 is a schematic diagram for explaining a method of changing the reflection angle of the mirror 35, and is a view of the mirror 35 and the rotating plate 115 as viewed from the width direction of the frame 110.
As shown in FIG. 5, the rotating plate 115 is held at the lower end of the side portion 112 so as to be rotatable around the axis AX <b> 2, and the protrusion 115 a is attached upward by the urging force of the tension coil spring 116. It is energized. Therefore, as shown in FIG. 6A, the rotating plate 115 is biased counterclockwise as shown by an arrow 91a around the axis AX2. The rotation of the rotating plate 115 in the illustrated counterclockwise direction is such that the protrusion 115a abuts on the tip 142a of the side part 142 of the moving frame 140 or the side of the frame 110 as shown in FIG. It is regulated by coming into contact with the tip 112a of the portion 112.

As described above, the internal thread portion (not shown) on the inner peripheral surface of the upper portion of the moving frame elevating section 150 is coupled to the external thread section 121 of the observation unit holding section 120. Further, the lower end of the observation unit holding part 120 is fixed to the upper side part 111 of the frame 110.
Therefore, when the inspector grips the knob 152 of the moving frame lifting / lowering unit 150 and rotates the moving frame lifting / lowering unit 150 around the axis, the moving frame lifting / lowering unit 150 moves relative to the observation unit holding unit 120, that is, moves. The frame elevating unit 150 moves in the vertical direction with respect to the frame body 110.
As described above, the lower end of the moving frame lifting / lowering unit 150 is rotatably coupled to the upper side portion 141 of the moving frame 140. Therefore, when the moving frame lifting / lowering 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, from the state shown in FIG. 6A, by rotating the moving frame elevating unit 150 around the axis, as shown in FIG. 6B, with respect to the frame 110 not shown in FIG. As shown by the arrow 91b, the side portion 142 of the moving frame 140 can be moved downward. As a result, the rotating plate 115 and the mirror 35 are rotated in the clockwise direction as shown by the arrow 91c about the axis AX2 against the urging force of the tension coil spring 116 (not shown in FIG. 6).
Further, the side frame 142 of the moving frame 140 is moved upward with respect to the frame 110 (not shown) by rotating the moving frame lifting / lowering unit 150 about the axis in the direction opposite to the rotation direction described above. Can be made. As a result, the rotating plate 115 and the mirror 35 are rotated counterclockwise in the figure about the axis AX2 by the urging force of the tension coil spring 116 (not shown in FIG. 6).
In some embodiments, the reflection angle of the mirror 35 can be changed in this manner. That is, in some embodiments, a drive mechanism 80 including the observation unit holding unit 120, the moving frame 140, and the moving frame lifting / lowering unit 150 is configured, and the rotating plate unit 115 is rotated about the axis AX2. Let

(About UV cut filter)
In the blade groove observation apparatus 1, 1 </ b> A according to some embodiments, it is used for magnetic particle flaw detection using fluorescent magnetic particles. In the blade groove observation devices 1, 1 </ b> A according to some embodiments, the presence or absence of light emission of the fluorescent magnetic powder due to the ultraviolet rays irradiated from the light irradiation unit 30 is confirmed by observing an image displayed on the monitor of the video scope 4. . At this time, since the image displayed on the monitor of the video scope 4 becomes purple due to ultraviolet rays, it may be difficult to confirm whether or not the fluorescent magnetic powder emits light.
Therefore, in some embodiments, an ultraviolet cut filter is provided at the distal end portion 42 of the insertion portion 41 in order to suppress ultraviolet rays incident on the image sensor inside the insertion portion 41 of the video scope 4. FIG. 7 is a diagram schematically showing a state in which an ultraviolet cut filter is provided at the distal end portion 42 of the insertion portion 41.
In some embodiments, as illustrated in FIG. 7, an ultraviolet cut filter 45 is sandwiched between the distal end portion 42 of the insertion portion 41 and the optical adapter 43.
Thereby, since the ultraviolet rays incident on the image sensor inside the insertion portion 41 can be suppressed by the ultraviolet cut filter 45, the emission of the fluorescent magnetic powder can be clearly confirmed in the image displayed on the monitor of the video scope 4.

(About brake device)
In the blade groove observing device 1 according to the embodiment, the carrier 10 includes a brake device 70 that can prohibit the rotation of the roller 20 described below.

With reference to FIGS. 9-11, the brake device 70 in the blade groove | channel 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. 10 is a perspective view of the roller 20 </ b> A whose rotation is prohibited by the brake device 70. In one embodiment, the brake device 70 generates a braking force for one of the two rollers 20. A brake disc 23 is attached to a rotating shaft 21 in the roller 20A. The brake disc 23 has a plurality of irregularities on the outer periphery.

As shown in FIGS. 9 and 11, the brake device 70 includes a brake shoe 71, a brake plate 72, and an urging 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 having a brake shoe 71 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 via a linear motion guide 75 so as to be movable in the vertical direction with respect to the carrier 10.

  The brake plate 72 is urged downward by the urging force of the urging 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 urging force of the urging spring 73. Thereby, 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 portions of the two shaft portions 74 via arm portions 76. When the gripping portion 12 (see FIG. 1) for handling the blade groove observation device 1 is gripped and the gripping lever 77 is pulled upward, the arm portion 76 and the two shaft portions 74 are moved as shown in FIG. The brake plate 72 coupled to the grip lever 77 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.

(About blade groove observation method using blade groove observation device 1, 1A)
By using the blade 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 schematic flow of a blade groove observation method performed using the blade groove observation devices 1 and 1A according to some embodiments. The blade groove observation method according to some embodiments is a blade groove observation method for observing the inside of the blade groove 5 of the rotor disk 2 using the blade groove observation devices 1 and 1A, and includes an insertion step S1 and an observation step S2. With.

The insertion step S <b> 1 is a step of inserting at least the light irradiation unit 30 and the observation unit 40 into the blade groove 5.
Specifically, the lower part of the holder 100 is inserted into the blade groove 5 after the fluorescent magnetic powder is adhered. In the blade groove observation apparatus 1 according to the embodiment shown in FIG. 1, when the roller 20 is brought into contact with the outer circumferential surface of the rotor disk 2 as shown in FIG. Inserted. At this time, in the blade groove observation apparatus 1 according to the embodiment, the blade groove observation apparatus 1 is pressed against the rotor disk 2 by the attractive 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. As a result, 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. It becomes easy to move along the circumferential direction of the disk 2, and the workability of the blade groove inspection is improved.

In the blade groove observation device 1 according to 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. Touch the surface. Specifically, in the guide roller 50, the tapered surface 52 comes into contact with the opening 2 a on the outer peripheral surface of the rotor disk 2, and the protrusion 51 enters the inner side in the radial direction of the rotor disk 2 from the opening 2 a.
Since the tapered surface 52 is in contact with the opening 2a on the outer peripheral surface of the rotor disk 2, when the blade groove observation device 1 is moved 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, if the center in the width direction of the guide roller 50 is shifted from the center in the width direction of the opening 2a, a difference occurs in the contact pressure at the two contact portions between the opening 2a and the tapered surface 52. 50 exerts a force that reduces the above-described deviation.
Thereby, since the blade groove | channel observation apparatus 1 can be stably moved along the blade groove | channel 5, the workability | operativity of a blade groove inspection improves.
Further, since the protrusion 51 enters the radially inner side from the opening 2a, the protrusion 51 is prevented from deviating from the opening 2a in the thickness direction of the rotor disk 2, that is, the axial direction of the turbine rotor. The The thickness direction of the rotor disk 2, that is, the axial direction of the turbine rotor is the left-right direction in FIG.

In the blade groove observation device 1 according to 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 20 </ b> A is prohibited by the brake device 70 described above. Thereby, since the blade groove observation device 1 can be prevented from unintentionally moving along the circumferential direction of the rotor disk 2 due to gravity, the workability of the blade groove inspection is improved.
When the inspector grips the grip portion 12 and pulls the grip lever 77 upward, the brake of the brake device 70 is released as described above, so that the inspector moves the blade groove observation device 1 to the rotor disk 2. It is possible to move freely along the outer peripheral surface.
In this way, since the inspector can release the brake of the brake device 70 by holding the holding portion 12 so as to move the blade groove observation device 1 along the circumferential direction of the rotor disk 2, the workability of the blade groove inspection is improved. improves.

  In the blade groove observation apparatus 1 </ b> A according to another embodiment shown in FIG. 8, the inspector holds the blade groove observation apparatus 1 </ b> A and inserts the lower part of the holder 100 into the blade groove 5. After the lower part of the holder 100 is inserted into the blade groove 5, if the blade groove observation device 1A is fixed to the rotor disk 2 by using a magnet base or the like, the inspector manually holds the blade groove observation device 1A. There is no need to have it. Even if a magnet pedestal or the like is not used, the inspector can hold the blade groove observation apparatus 1A with one hand, so that the other hand is free. Therefore, by using the blade groove observation apparatus 1A according to another embodiment shown in FIG. 8, the workability of the blade groove inspection is improved.

Next, the observation step S2 is executed. The observation step S2 includes a light irradiation area inside the blade groove 5 while irradiating light from the light irradiation unit 30 to the inside of the blade groove 5 with the light irradiation unit 30 and the observation unit 40 inserted into the blade groove 5. Is a step of observing the image with the observation unit 40.
At this time, by changing the reflection angle of the mirror 35 as described above, a desired area in the blade groove 5 can be irradiated with ultraviolet rays from the light irradiation unit 30.

In the T-root type blade groove 5, cracks are likely to occur in a radially outer corner portion of the blade groove 5 surrounded by a broken-line circle C in FIG. However, light is irradiated from the light irradiation unit 30 downward, that is, radially inward of the rotor disk 2 in a state where the light irradiation unit 30 is inserted into the blade groove 5 from the opening 2 a on the outer peripheral surface of the rotor disk 2. Then, it is difficult for light to reach the radially outer corner portion of the blade groove 5.
In that respect, in some embodiments, light from above from the light irradiation unit 30 is reflected by the mirror 35, so that the light easily reaches the radially outer corner of the blade groove 5. Thereby, since it becomes easy to observe the part which is easy to produce a crack, the workability | operativity of a blade groove inspection improves.
In some embodiments, the angle of light reflected from above the light irradiation unit 30 by the mirror 35 is adjusted by rotating the rotating plate 115 about the axis AX2 along the width direction of the frame 110. Since it can be adjusted, the region to be observed can be efficiently irradiated with light.

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

Thereafter, the position in the circumferential direction in the rotor disk 2 of the blade groove observation device 1, 1 </ b> A is appropriately changed to observe the blade groove 5.
As described above, according to the blade groove observation method using the blade groove observation device 1, 1 </ b> A, the blade groove 5 of the rotor disk 2 using any one of the blade groove observation devices 1, 1 </ b> A according to some embodiments. Since the inside is observed, it is not necessary for the inspector to hold the light irradiation unit 30 and the observation unit 40 by hand, and the workability of the blade groove inspection is improved.

  In addition, by using the blade groove observation devices 1 and 1A according to some embodiments, the blade groove 5 can be easily observed, and oversight of the blade groove 5 can be suppressed.

The present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.
For example, the light irradiation unit 30 of some embodiments described above is the optical fiber cable 31 that guides the ultraviolet light emitted from the ultraviolet light emitting device 3 and irradiates it in the blade 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 below the frame 110.

  The observation unit 40 of some 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 with the holder 100, a small imaging unit having an imaging element may be disposed below the frame 110.

  In the blade groove observation apparatus 1 according to the embodiment described above, two guide rollers 50 are provided, but at least one guide roller 50 may be provided. Further, 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 above-described embodiment, 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 blade 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 that protrudes below the carrier 10 and is inserted into the blade groove 5 may be provided. Even with such a configuration, since the blade groove observation device 1 can be stably moved along the blade groove 5, the workability of the blade groove inspection is improved.

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

1,1A Wing groove observation device 10 Carrier 12 Holding unit 20 Roller 30 Light irradiation unit 35 Mirror 40 Observation unit 50 Guide roller 60 Magnet 70 Brake device 77 Holding lever 80 Drive mechanism 100 Holder 110 Frame body 115 Rotating plate unit

Claims (10)

Career,
Two rollers each having a rotation axis parallel to each other and provided below the carrier so as to be rotatable with respect to the carrier;
A light irradiation unit provided so as to protrude downward from the carrier;
An observation unit provided to project downward from the carrier and for observing the light irradiation area inside the blade groove by the light irradiation unit;
A holder that is fixed to the carrier and holds the light irradiation unit and the observation unit ;
The light irradiation unit and the observation unit are positioned below a plane including the central axis of the two rollers ,
The blade groove observing device , wherein the holder is disposed so that a projection position on the plane is positioned between the two rollers and fixed to the carrier . Career,
Two rollers each having a rotation axis parallel to each other and provided below the carrier so as to be rotatable with respect to the carrier;
A light irradiation unit provided so as to protrude downward from the carrier;
An observation unit provided to project downward from the carrier and for observing the light irradiation area inside the blade groove by the light irradiation unit;
A guide portion configured to guide the carrier along the blade groove ,
The light irradiation unit and the observation unit are positioned below a plane including the central axis of the two rollers.
A blade groove observation apparatus characterized by the above. The blade groove observing apparatus according to claim 2 , wherein the guide portion is a guide roller formed so that the diameter thereof decreases from the center in the width direction toward the end portion. Career,
Two rollers each having a rotation axis parallel to each other and provided below the carrier so as to be rotatable with respect to the carrier;
A light irradiation unit provided so as to protrude downward from the carrier;
An observation unit provided so as to protrude downward from the carrier, and for observing the light irradiation area inside the blade groove by the light irradiation unit,
The carrier, viewed contains at least one rotation inhibiting capable braking device of the roller, and a gripping portion having a gripping lever for brake release of the brake device,
The light irradiation unit and the observation unit are positioned below a plane including the central axis of the two rollers.
A blade groove observation apparatus characterized by the above. The blade groove observation device according to any one of claims 1 to 3 , wherein the carrier includes a brake device capable of prohibiting rotation of at least one of the rollers. The blade groove observing device according to claim 5 , wherein the carrier includes a grip portion having a grip lever for releasing the brake of the brake device. The blade groove observation apparatus according to any one of claims 1 to 6 , wherein the carrier includes a magnet arranged so that lines of magnetic force are distributed downward of the carrier. A light irradiation unit;
A mirror for guiding the light emitted from the light irradiation unit to an observation target area inside the blade groove;
An observation unit for observing the observation target area;
A holder for holding the light irradiation unit, the mirror and the observation unit,
The holder includes a frame that holds 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 body around an axis along the width direction of the frame body, and reflects light from above from the light irradiation unit. A blade groove observing device, characterized in that it is configured as described above. The frame has a rotating plate portion that rotatably holds the mirror around an axis along the width direction of the frame,
The blade groove observation apparatus according to claim 8 , further comprising a drive mechanism for rotating the rotating plate portion around an axis along a width direction of the frame body. 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 9 ,
Inserting at least the light irradiation unit and the observation unit into the blade groove;
While irradiating light from the light irradiation unit to the inside of the blade groove with the light irradiation unit and the observation unit being inserted into the blade groove, the light irradiation area inside the blade groove is adjusted by the observation unit. Observing steps,
A blade groove observation method comprising:

Images