JPH10216983A - Laser beam maintenance and repair device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laser beam maintenance and repair device capable of using high energy intensity laser beam, facilitating machining with a laser beam and extending an applicable range. SOLUTION: This device is provided with a laser beam oscillator 7, a beam transmission means 3 connected to transmit a laser beam from the laser beam oscillator 7 and an irradiation head 13 to condense a laser beam from the beam transmission means 8 and to irradiate a work. In this case, the beam transmission means 8 has tubular beam transmission members 9a-9h constructed liquid tight, a reflecting member is arranged inside the beam transmission members 9a-9h, at least one among mechanism imparting horizontal turning, horizontal extension/retraction, vertical turning and vertical extension/retraction is arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser maintenance / repair apparatus for processing a material, improving residual stress on a work surface, modifying a surface, repairing a weld, etc., using a laser beam. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser maintenance / repair device that guides a laser beam for a predetermined distance to converge and irradiate a laser beam to a construction unit and that can efficiently irradiate a laser beam with high energy density.

[0002]

2. Description of the Related Art Laser light is coherent monochromatic light having a very short wavelength, has a well-aligned phase, and has very high convergence. Therefore, it is necessary to concentrate high-density light energy in a small area. It is used in a wide range of fields such as communication, measurement, medical treatment, and metal processing.

[0003] In the field of metalworking, various processes such as welding, cutting, drilling, and surface modification are performed using a laser beam having a high energy density. Since processing using laser light is a non-contact processing, processing can be performed in any place where light can reach, and the irradiation head that focuses laser light and irradiates it to the construction part is also small. can do. In addition, since there is little heat input to the material, there is an advantage that precise processing is possible. Taking advantage of these advantages,
2. Description of the Related Art Processing using laser light is used for maintenance and repair of atomic pressure vessels and reactor internal structures such as nuclear power plants.

For example, the internal structure of a boiling water reactor is as follows:
It is made of a material having sufficient corrosion resistance and high-temperature strength under a high-temperature and high-pressure environment, such as austenitic stainless steel or a nickel-based alloy. Since these members are exposed to severe environments for a long time due to the long-term operation of the plant and are affected by neutron irradiation, the problem of material deterioration must be considered. In particular, the vicinity of the welded portion of the furnace internal structure has a potential stress corrosion cracking risk due to sensitization of the material due to heat input and residual tensile stress.

In recent years, techniques for improving the surface of various materials have been developed as preventive maintenance measures for safe operation of nuclear power plants. Among them, a technique for irradiating a laser beam to a material surface to perform surface modification is disclosed in, for example, JP-A-7-246483 and JP-A-8-206869.

The former irradiates a laser beam from a pulse laser device to the surface (work surface) of a workpiece through a reflection mirror, and irradiates the laser beam while changing the irradiation position on the work surface, thereby compressing the work surface. Is a method of remaining.

The latter method irradiates a high-power, short-pulse laser beam having a visible wavelength to a construction surface immersed in cooling water,
This is a method for improving residual stress on the construction surface, removing cracks or removing cladding.

In these methods and apparatuses, an optical fiber is used as a light guiding means for guiding a laser beam from an oscillator to a work surface. Optical fibers have the advantage of being flexible and capable of guiding light to a narrow area.

In the laser beam irradiation head, the laser beam guided by the optical fiber is condensed to an arbitrary area by a condensing optical system such as a lens, and further, the optical path is changed by a mirror or the like, and the laser beam is processed. Irradiation anywhere.

[0010] As described above, the conventional laser processing apparatus in the case where the laser oscillator and the construction surface are separated from each other, transfers the laser light generated by the laser oscillator by a light guide means such as an optical fiber, and transmits the laser light to the optical waveguide (laser light). At the end of the transfer path), the laser light is condensed by a lens and a reflection mirror and is irradiated to the construction part.

FIG. 20 is a configuration diagram of a conventional laser processing apparatus when the laser oscillator and the work surface are separated from each other.

As shown in FIG. 20, an irradiation head 51 of a laser processing apparatus installed in a liquid is transmitted from a laser light source (laser oscillator) (not shown) by a light guide means (optical fiber). A condenser lens 53 for converging the laser light 52 and a reflection mirror 55 for reflecting the collected laser light 52 and irradiating the construction part 54 with the light.
And an optical window 56 for sealing the liquid in order to hold the condenser lens 53 and the reflection mirror 55 in the air (inside the light guide means having a liquid-tight structure) so that work in the liquid is possible. I have.

The laser beam used for construction has a high energy density. When the construction section 54 and the irradiation head 51 are close to each other, the laser beam also has a high energy density on the surfaces of the optical window 56 and the reflection mirror 55. Assuming that the pulse energy of the transmitted laser light is 200 mJ and the irradiation area on the material surface is 1 mm ² , the energy density is 20 J /
reach cm ^2. When the construction section 54 and the optical window 56 are in close contact, when the beam diameter is 20 J / cm ^{2 on} the surface of the optical window 56 and 5 mm ^{2 on the} surface of the reflection mirror 55, 4 J / c.
An optical intensity of m ² or more is required.

[0014]

However, in the conventional laser processing apparatus having the above-described structure, a laser beam having a high energy density is restricted due to an optical fiber for guiding light, and a lens or a reflecting mirror for condensing or reflecting the laser beam. There was a limit to irradiation. In addition, there is also a difficulty in processing due to the use of the optical fiber and the lens or the reflecting mirror having the above structure. Hereinafter, this will be described.

As described above, the conventional laser processing method and apparatus use the optical fiber to guide the laser light from the oscillator to the work surface, but the power or energy that can be guided by the optical fiber is used. Had limitations.
This material limitation of the optical fiber limits the energy density of the laser beam of the laser processing apparatus, and limits the processing performance.

In order to obtain the necessary optical power and energy density on the required construction surface in the case of the above-mentioned surface modification, it is necessary to condense the light emitted from the optical fiber as small as possible. . However, the light emitted from an optical fiber is essentially equivalent to diffused light using the core of the optical fiber as a light source, and spreads and emits at the NA (Numerical Aperture) determined by the refractive index of the constituent material of the optical fiber. There is. Generally, an optical fiber for a power laser has an NA number of about 0.2, and light emitted from this optical fiber diffuses at an angle of about 46 degrees (= 2 sin ^-1 (0.2)).

In order to irradiate light from such an optical fiber onto a work surface, it is necessary to form an image of the core of the optical fiber on a material using a lens. In this case, the size of the image on the construction surface is obtained by multiplying the magnification by the size of the optical fiber core. Due to such properties, it is necessary to reduce the magnification in order to condense the light emitted from the optical fiber as small as possible.

However, when the magnification is reduced, the NA number of the convergent beam emitted from the lens increases. That is, when the magnification is M, the number of NAs of the optical fiber is A, and the number of NAs on the image side is B, there is a relation of M = A / B.
For example, when using an optical fiber (A = 0.2) and making the same size as the core of the optical fiber, B = 0.2 and 4
It converges at an angle of 6 degrees.

In the case of converging at such a deep angle, the depth of focus becomes very shallow. Therefore, when a construction surface having a complicated shape is targeted, the irradiation optical system including the optical fiber and the lens must be precisely formed. Had to be positioned.

The above problem always accompanies the case where laser light is transmitted by an optical fiber, and does not apply to the case where light is transmitted through space and condensed by a lens having a low NA.

On the other hand, the irradiation head for condensing and reflecting the laser light to irradiate the construction part also has a limitation on the irradiation of the high energy density laser light.

As described above, the laser light transmitted from the laser light source to the irradiation head section near the processing section is condensed to an arbitrary area by a condensing optical system such as a lens, and the optical path is changed by a reflection mirror or the like. When irradiating high-energy laser light, the optical system such as the condenser lens and reflection mirror has sufficient power for the laser light to prevent damage. It must have enough optical strength to withstand.

In particular, when it is necessary to make a reflecting mirror that reflects laser light after condensing light or an irradiation head incorporating these optical systems for reasons of underwater construction or the like liquid-tight, the laser light is applied to the inside of the irradiation head. An optical window for emitting light from outside must withstand laser light having a very high energy density.

However, a reflection film such as a dielectric material usually formed on the surface of the reflection mirror is expensive and high in reflectivity, but has to be said to have poor optical strength. In the case of continuous light lasers, the energy density of the laser light does not usually reach such a level that these optics can be damaged, but for very short pulse laser light the peak energy can exceed this level This has been a factor that limits the energy of laser light that can be used for processing.

Since the reflection mirror is easily damaged, for example, in the laser processing apparatus shown in FIG. X, the angle of incidence on the reflection mirror 5 is 0 ° or 45 ° to prevent damage.
It was limited to a fixed angle such as ゜. For this reason, it was not possible to drive the mirror to irradiate the laser beam at an arbitrary angle. This limits fine adjustment during processing.

Further, when the condenser lens 7 and the reflection mirror 5 are brought closer to each other in order to increase the beam diameter of the laser beam on the surface of the reflection mirror 5, the condenser lens 7 must have a short focal length. did not become. The problem of having to increase the beam diameter on the reflecting mirror, combined with the problem of having to reduce the magnification factor due to the optical fiber described above, has to further shorten the focal length of the lens, and this is a problem on the surface of the irradiation part. This causes a large error in the irradiation area.

Therefore, an object of the present invention is to make it possible to use a laser beam having a high energy density,
It is another object of the present invention to provide a laser maintenance / repair device capable of facilitating processing by a laser beam or expanding an applicable range.

[0028]

According to a first aspect of the present invention, there is provided a laser maintenance / repair device, comprising: a laser oscillator; a light guide connected to guide laser light from the laser; In a laser maintenance / repair device comprising an irradiation head for condensing laser light and irradiating the construction part, the light guide means has a tubular light guide member configured in a liquid-tight manner. Provide a reflective member inside,
The light guide member may be provided with at least one of mechanisms for imparting horizontal rotation, horizontal expansion / contraction, vertical rotation, and vertical expansion / contraction operation.

According to the present invention, the laser light is guided by the tubular light guide member instead of the optical fiber, so that the laser light generally passes through the air and has a higher energy density than the optical fiber. Laser light can be transmitted.

In the case where laser light is transmitted spatially, parallel light is easily obtained, so that the requirement that the magnification must be reduced is relaxed, and the depth of focus can be increased, so that the requirement of positioning accuracy is relaxed.

Further, since the light guide means is provided with a revolving / expanding mechanism, it is easy to bring the irradiation head close to the construction surface and to oppose it. Light can be sent to the illumination head. This laser maintenance and
If the repair equipment is used, laser peening, melting,
Preventive maintenance and repair work such as cladding and welding can be performed.

The laser maintenance / repair device according to claim 2 of the present application has a laser power supply installed outside the reactor pressure vessel, and a laser irradiation device installed inside the reactor pressure vessel connected to the laser power supply. The laser irradiation device,
A laser oscillator connected to the laser power source, a watertight container containing the laser oscillator and having a laser transmission window, a light guide connected to the laser transmission window of the watertight container, and a laser beam from the light guide. An irradiation head that emits light to irradiate the construction section, wherein the light guide unit has a liquid-tight tubular light guide member connected in series to the water-tight container, and A reflection member is provided inside the member, and the light guide member is horizontally turned, horizontally expanded and contracted, vertically turned,
The present invention is characterized in that at least one mechanism is provided among mechanisms for imparting a vertical expansion / contraction operation.

According to the present invention, the distance between the laser oscillator and the work surface can be shortened, so that the transmission loss of laser light can be reduced. Further, the positioning accuracy can be easily increased, and the light guide member requiring the relative position accuracy can be shortened, so that the work at the time of installation becomes easy.

The laser maintenance / repair device according to the third aspect of the present invention is the laser maintenance / repair device according to the second aspect, wherein a center post is erected on an upper lattice plate above the shroud body in the reactor pressure vessel. A turning device is provided on the center post so as to be able to freely turn horizontally, a moving truck is provided on the turning device so as to be movable in the horizontal direction, and the laser irradiation device is mounted on the moving truck.

According to the present invention, the irradiation head is turned, horizontally extended, and moved up and down by the turning drive device and the turning mechanism and the expansion and contraction mechanism of the laser irradiation device which are remotely driven via the center post on the upper lattice plate. Accordingly, the construction surface can be reliably irradiated with laser light, and thereby preventive maintenance and repair work such as laser peening, melting, cladding, and welding of the reactor pressure vessel and the internal structure of the reactor can be performed.

A laser maintenance / repair device according to a fourth aspect of the present invention is the laser maintenance / repair device according to the third aspect, wherein a vertical wheel and a horizontal wheel contacting the upper edge of the shroud body at the tip of the turning device. It is characterized by being attached.

According to the present invention, since the turning device can be smoothly turned by the vertical wheels and the horizontal wheels running on the upper edge of the shroud body, maintenance and repair work in the reactor can be easily performed. be able to.

A laser maintenance / repair device according to a fifth aspect of the present invention is the laser maintenance / repair device according to the second aspect, wherein the upper lattice plate on the upper part of the shroud body in the reactor pressure vessel is horizontally turned, horizontally extended and extended. A remote drive having an up-and-down lifting mechanism is provided, and the remote drive is provided with the laser irradiation device.

According to the present invention, the irradiation head has an operating range in which the entire inner wall of the shroud can be covered by a remote driving device having three degrees of freedom of horizontal turning, horizontal extension, and vertical movement, and the irradiation head is mounted on the work surface in the reactor pressure vessel. , And a series of maintenance and repair work such as inspection and repair can be continuously and efficiently performed.

Further, the irradiation head is inserted from a lattice hole different from the lattice hole of the upper lattice plate in which the remote driving device is installed, so as to alleviate the dimensional restrictions (passage condition of the core support plate) of the irradiation head and the remote driving device. Therefore, work inside the shroud below the core support plate can be performed.

The laser maintenance / repair device according to claim 6 of the present application is the laser maintenance / repair device according to any one of claims 1 to 5, wherein the rotating mechanism for imparting the turning operation is provided on an outer surface of the light guide member. It is characterized by comprising a bearing and an O-ring provided, a motor for rotational driving, and a gear provided on an outer surface of the light guide member meshing with a gear attached to a rotating shaft of the motor.

According to the present invention, one light guide member and the other member are rotatably mounted and can be relatively rotated by a motor (actuator). In addition, one member and the other member are attached to be able to expand and contract, and can be relatively expanded and contracted by an expansion and contraction mechanism (actuator). In addition, since the light guide member is liquid-tight and rotatably mounted at the same time, the light guide member can be rotated while maintaining the liquid-tightness. You can stretch while stretching.

The laser maintenance / repair device according to claim 7 of the present invention is the laser maintenance / repair device according to any one of claims 1 to 6, wherein the reflection member in the light guide member has a first and a second motor. , A positioning mechanism rotatable about axes orthogonal to each other is provided.

According to the present invention, the angle of the reflecting member can be changed while the reflecting member is centered by the first and second motors. Therefore, even if the position shift occurs due to the deflection of the light guide member, the position can be remotely adjusted,
The construction can be completed in a short time without interrupting the work.

The laser maintenance / repair device according to claim 8 of the present application provides a laser oscillator, light guiding means connected to guide laser light of the laser oscillator, and condensing laser light from the light guiding means. In the laser maintenance / repair device comprising an irradiation head for irradiating the laser beam to the construction part, the irradiation head forms an element for sealing the light guide means at the end of the optical waveguide of the light guide means and transmits laser light. An optical window, a condensing member arranged inside the light guide means or outside the light guide means of the optical window for condensing the laser light, and a work part which reflects the laser light condensed by the light condensing member. The reflective mirror has a transparent body, and a reflective layer made of a vacuum or a predetermined fluid provided on the back surface of the transparent body. By total reflection at the boundary of the reflective layer is characterized in that the reflected laser light.

According to the present invention, the optical window is formed as a sealing element of the light guide means, so that the optical window is disposed near the light collecting member, and the area of the optical window irradiated with laser light is increased. For this reason, the energy density of the laser beam with respect to the optical window is reduced, and the energy of the laser beam that can be transferred by the light guiding means is increased.

The reflecting mirror according to the present invention is provided with a reflecting layer made of a vacuum or a predetermined fluid on the back surface of the mirror,
Since the laser beam is reflected by total reflection at the boundary between the mirror back and this reflective layer, the engineering strength of the reflective film on the reflective mirror surface is eliminated, and a laser beam with a high energy density is used. It is possible.

According to a ninth aspect of the present invention, there is provided a laser maintenance / repair device, comprising: a laser oscillator; a light guide connected to guide a laser beam of the laser; and a laser beam from the light guide. In the laser maintenance / repair device comprising an irradiation head for irradiating the laser beam to the construction part, the irradiation head forms an element at the end of the optical waveguide of the light guide means for sealing the light guide means and collects laser light. A light-collecting member, and a reflection mirror configured to reflect the laser light condensed by the light-condensing member and irradiate the construction portion with the reflection mirror, wherein the reflection mirror is provided on a transparent body and a back surface of the transparent body. A reflective layer made of a vacuum or a predetermined fluid, and reflects the laser beam by total internal reflection at the boundary between the transparent body back surface and the reflective layer.

According to the present invention, since the light collecting member also functions as a sealing element of the light guide means, the optical window can be eliminated. That is, it is possible to simplify the structure and completely eliminate the limitation due to the optical intensity of the optical window.

The laser maintenance / repair device according to claim 10 of the present application is the laser maintenance / repair device according to claim 8 or 9, wherein the irradiation head is provided with a liquid jet nozzle for removing a laser light scattering causing substance in a construction portion. It is characterized by having.

According to the present invention, since the liquid jet nozzle for removing the substance causing laser light scattering is provided in the irradiation head, it is possible to remove air bubbles or dust generated in the application section, and to efficiently apply the laser light. Part can be irradiated.

The laser maintenance / repair device according to claim 11 of the present application is the laser maintenance / repair device according to claim 8 or 9, wherein the irradiation head is a liquid jet nozzle for forming a liquid layer on the surface of a laser irradiation portion. It is characterized by having.

According to the present invention, since the irradiation head is provided with the liquid jet nozzle for forming a liquid layer on the surface of the laser irradiation part, the same processing as in liquid even in air is possible.

The laser maintenance / repair device according to claim 12 of the present application is the laser maintenance / repair device according to any one of claims 8 to 11, wherein the irradiation head is cylindrically integrated with the tip of the light guide means. Wherein the light guiding means is provided with a mechanism for imparting rotation in the circumferential direction and expansion and contraction in the axial direction, so that the inner surface of the tubular construction can be machined.

According to the present invention, the distal end portion of the light guide means and the irradiation head are rotated in the circumferential direction by integrating the distal end portion of the light guide means and the irradiation head into a cylindrical shape and imparting rotation and expansion / contraction operations. Alternatively, the processing can be performed while being moved in the axial direction. In particular, the inner surface of the tubular construction portion can be easily processed.

The laser maintenance / repair device according to claim 13 of the present application is the laser maintenance / repair device according to any one of claims 8 to 12, wherein the reflection mirror of the irradiation head is provided with first and second motors. It is characterized in that a positioning mechanism rotatable about axes orthogonal to each other is provided.

According to the present invention, since the reflecting mirror is provided with a positioning mechanism rotatable about axes orthogonal to each other by the first and second motors, the angle of incidence of the laser light on the reflecting mirror is reduced. The laser beam can be driven in an angle range larger than the critical angle of total reflection to process the laser beam by reflecting the laser beam in an arbitrary direction. Accordingly, it is possible to continuously process a wide range of the working portion without moving the irradiation head.

The laser maintenance / repair device according to claim 14 of the present application is the laser maintenance / repair device according to any one of claims 8 to 13, wherein the light guide means is made of an optical fiber, and the irradiation head is turned horizontally. It is characterized by being supported by a supporting and driving device having at least one of mechanisms for imparting horizontal expansion / contraction, vertical turning, and vertical expansion / contraction operations.

According to the present invention, the irradiation head is supported and driven by the support driving device, and the light guide means is constituted by a flexible optical fiber. Laser light can be easily transmitted.

[0060]

Next, an embodiment of a laser maintenance / repair device according to the present invention will be described with reference to the accompanying drawings. In addition, as is clear from the above description, the laser maintenance / repair device according to the present invention uses a light guiding means for transferring a laser beam, a laser beam for enabling the use of a laser beam having a high energy density, and the like. Improvements have been made to the irradiation head for condensing and irradiating, the device for remotely controlling the irradiation head, and the like. However, these can be used alone or in combination to provide a sufficient effect. Therefore, each of the following embodiments will separately describe improvements in the light guide means, the irradiation head, and the like, but these embodiments can be used in combination with each other.

First, a first embodiment of the laser maintenance / repair device according to the present invention will be described with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a reactor pressure vessel in a state where an upper lid is removed. A cylindrical shroud cylinder 2 as a reactor internal structure is provided in a reactor pressure vessel 1.
Is installed, and the lower end of the shroud barrel 2 is welded to the bottom of the reactor pressure vessel 1. A grid-shaped upper grid plate 3 is fixed to the upper part of the shroud cylinder 2, and a core support plate 4 having circular holes provided at equal pitches in the middle part is fixed by bolts.

The fuel assembly is usually installed between the upper lattice plate 3 and the core support plate 4. However, during a series of preventive maintenance work and repair work such as inspection and inspection of the inside of the shroud drum 2, It is necessary to remove the fuel assembly using a refueling machine and insert working equipment from the grid of the upper grid plate 3. The internal dimensions of the grid into which this work equipment is inserted are about 290 mm.

The maintenance inside the reactor pressure vessel 1 is performed in remote water by submerging the reactor internals in order to prevent radiation exposure of workers. The water depth to the lowermost part of the shroud barrel 2 is about 25 m.

Reference numeral 5 denotes an operation floor installed above the reactor pressure vessel 1. On this operation floor 5, a laser power source 6 and a laser oscillator 7 connected to the laser power source 6 are installed. The laser oscillator 7 is connected to a light guide means 8 having functions of ascending and descending from the operation floor 5 to a lower portion inside the shroud barrel 2 and horizontally turning and expanding and contracting horizontally.

As shown in FIG. 2 (a), the light guide means 8 has a first light guide member 9a connected to the laser oscillator 7 in the horizontal direction, and a vertical direction to the tip of the first light guide member 9a. The second light guide member 9b having the first rotation mechanism 10a is connected. The second light guide member 9b has a large diameter third light guide member 9c.
Are connected in the vertical direction, and a small-diameter fourth light guide member 9d inserted into the third light guide member 9c is provided.

The third light guide member 9c and the fourth light guide member 9d
Has a first telescopic mechanism 11a attached thereto, and the operation of the first telescopic mechanism 11a causes the fourth light guide member 9d to move to the third
Is inserted or pulled out into the light guide member 9 and is vertically expandable and contractible.

A fifth light guide member 9e and a sixth light guide member 9f are connected to the distal end of the fourth light guide member 9d in the horizontal direction, as shown in FIG. Have been. As shown in FIG. 2A, a seventh light guide member 9g and an eighth light guide member 9h are provided at the distal end of the sixth light guide member 9f.
Is connected. The fifth light guide member 9e is provided with a second rotation mechanism 10b, and has a large diameter seventh light guide member 9b.
A second telescopic mechanism 11b that expands and contracts in the horizontal direction is provided on the eighth light guide member 9h having a small diameter g.

An irradiation head 12 is attached to the tip of the eighth light guide member 9h. Further, a first reflecting member 13a (mirror) is inserted into a tip portion in the first light guiding member 9a, and a second reflecting member 1 is provided in a lower portion in the fourth light guiding member 9d.
3b (mirror) is inserted, and a light collecting member 14 (lens) is inserted into the irradiation head 12.

In such a configuration, the laser power source 6 installed on the operation floor 5 is operated to apply a voltage to the laser oscillator 7 and to apply a laser beam 15 (see FIG. 1).
Is irradiated. The laser light 15 emitted from the laser oscillator 7 is reflected by the first reflecting member 13a in the first light guiding member 9a of the light guiding means 8, and is reflected by the second to fourth light guiding members 9b to 9b.
9d, reflected by the second reflecting member 13b, and
The light is condensed by the condensing member 14 through the eighth light guide members 9e to 9h so that a spot having an appropriate diameter is formed on the construction surface 16.

The first and second rotating mechanisms 10 of the light guiding means 8
a, 10b and the first and second telescoping mechanisms 11a, 11b are operated to scan the irradiation head 12 near the construction surface 16 in the reactor pressure vessel 1 including the reactor internals or the nozzle. The surface 16 is irradiated with a laser beam 15 to perform preventive maintenance or repair work.

According to the present embodiment, the light guide means 8 transfers the laser light 15 through the optical waveguide (transfer path of the laser light) formed therein and drives the irradiation head 12 to drive the work surface 16. It has a rotation function and an expansion / contraction function so that it can be irradiated with laser light. Therefore, it is easy to bring the irradiation head 12 closer to the construction surface 16 and to face it.

Further, since the laser oscillator 7 is arranged on the operation floor 5 where there is sufficient space,
High-energy density laser light 15 can be emitted from the large laser oscillator 7. By this irradiation, laser peening, melting, cladding, and the like are performed on the construction surface 16 in the reactor pressure vessel 1 including the reactor internals or the nozzle portion.
Preventive maintenance and repair work such as welding can be performed.

Next, a second embodiment of the laser maintenance / repair device according to the present invention will be described with reference to FIGS.

Note that FIGS. 1 and 2 in FIGS. 3 and 4
The same reference numerals are given to the same portions or portions having the same functions, and the description of the overlapping portions is omitted.

This embodiment is different from the first embodiment only in that only a laser power source 6 is installed on the operation floor, and a laser oscillator 7 is connected to the laser power source 6 via a cable line 17. The oscillator 7 and the laser irradiation device 18 (which comprise a liquid-tight structure, a light guide means 8 and an irradiation head 12 described later) and the reactor pressure vessel 1
Installed inside. With this configuration, the laser oscillator 7
The positioning distance at the time of laser beam irradiation can be improved by shortening the distance between the laser beam and the construction surface 16. In addition, since the light guide member of the light guide unit 8 is shortened, the installation of the laser irradiation device 18 can be facilitated.

The laser irradiation device 18 includes the laser oscillator 7, the watertight container 19, the light guide 8, and the irradiation head 12 described in the first embodiment.
As shown in FIG. 4A, the watertight container 19 has a laser transmission window 20 through which the laser light 15 emitted from the laser oscillator 7 passes. The first light guide member 9a is connected so as to cover the laser transmission window 20 of the watertight container 19. The configuration of other parts is basically the same as that of the first embodiment, and the description of those parts will be omitted.

In such a configuration, the laser beam 15 from the laser oscillator 7 enters the first light guide member 9a through the laser transmission window 20 of the watertight container 19, and is reflected by the first reflection member 13a while the first light is reflected by the first reflection member 13a. As in the embodiment, the light is condensed on the construction surface 16 via the light condensing member 14 of the irradiation head 12, and the reactor pressure vessel 1 including the in-furnace structure or the nozzle portion
Preventive maintenance and repair work of laser peening, melting, and welding are performed on the construction surface 16 inside.

The first and second rotating mechanisms 10 of the light guiding means 8
By operating the a, 10b and the first and second telescopic mechanisms 11a, 11b, the irradiation head 12 can be scanned on the construction surface 16, so that a desired range can be constructed without any corners.

According to the present embodiment, the laser oscillator 7
Since the distance between the laser beam and the construction surface 16 can be shortened, it is easy to increase the positioning accuracy for laser irradiation. In addition, since the light guide member that must be installed with high relative positional accuracy during installation can be shortened, the work at the time of installation becomes easy.

Next, a third embodiment of the laser maintenance / repair device according to the present invention will be described with reference to FIGS.

In FIGS. 5 and 6, the same parts or parts having the same functions as those in FIGS. 1 to 4 are denoted by the same reference numerals, and the description of the overlapping parts will be omitted.

The present embodiment is different from the second embodiment in that a center post 21 is provided on the upper lattice plate 3 and a turning device 22 which turns horizontally around the center post 21 is provided. A rail 23 is mounted on the turning device 22.
Is laid, and a movable carriage 24 running on the rail 23 is provided,
The laser irradiation device 18 including the watertight container 19 and the light guide 8 is provided on the movable carriage 24.

FIG. 6 is an enlarged view of part A in FIG.
A vertical wheel 25 is attached to the lower surface of the tip of the turning device 22, and the vertical wheel 25 is attached to the upper edge 2a of the shroud.
Travel along the top surface of the. Also, the shroud upper edge 2
a horizontal wheel 26 running along the upper inner surface of the turning device 22 has a horizontal wheel mounting member 27
Has been attached through.

In the present embodiment, the turning device 22 turns horizontally around the center post 21 installed on the upper lattice 3. Moving cart 2 installed on turning device 22
Since a watertight container 19 containing the laser oscillator 7 is installed in 4, the laser irradiation device 18 is freely movable in the horizontal direction. The irradiation head 12 of the laser device 18 is vertically movable by an expansion / contraction mechanism attached to the light guide member. The reflection member 13 is provided in the light guide member.
(Mirror) is provided, and the light-collecting member 14 (lens) is incorporated in the irradiation head 12.

According to the present embodiment, the upper lattice plate 3 in the core portion is provided with a turning device which is remotely driven via the center post 21, and the turning device 22 is provided with the movable carriage 24 and the laser irradiation device 18. I have. Work surface 1 when the inner surface inside shroud 2 is used as work surface 16 for irradiation head 12
6 can be given three degrees of freedom of horizontal rotation, horizontal extension and vertical movement, so that it is easy to perform preventive maintenance and repair work such as laser peening, melting, cladding, and welding.

Further, since the turning device 22 can be smoothly turned by the vertical wheels 25 and the horizontal wheels 26 running on the upper edge 2a of the shroud drum 2, preventive maintenance work in the reactor is further facilitated. Become.

FIG. 7 shows another modification of the embodiment of FIG. 6, and the same parts as those of FIG. 6 are denoted by the same reference numerals. FIG. 7 shows a case where the lower surface of the upper edge 2a of the shroud is used as a construction surface 16 to perform preventive maintenance and repair work on the construction surface 16.

In this modification, a third reflecting member 13c is provided between the tip of the irradiation head 12 and the light condensing member 14, so that the light emitted from the second reflecting member 13b through the light condensing member 14 is irradiated in the horizontal direction. Is reflected upward in the right angle direction, and the laser light 15 is applied to the construction surface 16 on the lower surface of the upper edge 2a of the shroud. By doing so, it is possible to reliably irradiate the laser light 15 also on the construction surface 16 existing in the downward portion of the lower surface of the shroud upper edge 2a.

Next, a fourth embodiment of the laser maintenance / repair device according to the present invention will be described with reference to FIGS.

FIG. 8 shows a state in which the vicinity of the weld at the upper edge of the shroud is repaired, while FIG. 9 shows a state in which the weld at the lower part of the shroud is repaired. The same reference numerals are given and the description of the overlapping portions will be omitted.

In this embodiment, a remote drive unit 28 having a swivel, extension, up and down elevating mechanism is provided on the upper lattice plate 3 in the core, and a liquid-tight container 19 containing the laser oscillator 7 is provided in the remote drive unit 28. . This liquid-tight container 19 is placed in the reactor water in the reactor pressure vessel 1, and a laser irradiating device comprising a light guide means 8 in which a plurality of light guide members are combined in accordance with a transparent laser transmission window 20 of the liquid-tight container 19. 18.

The laser irradiation device 18 is a remote driving device 28
Is mounted on the upper lattice plate 3 in the core portion, and then attached to the vertical drive unit of the remote drive device 28 in a state where the cross-sectional shape is smaller than the lattice of the upper lattice plate 3.

Next, after being positioned at the work position by the degree of freedom of up and down, turning, and extension of the remote drive device 28, the irradiation head 12 is moved to the work surface 16 by using the rotating mechanism 10 and the telescopic mechanism 11 of the laser irradiation device 18. Scan and work.

The remote drive device 28 has a structure in which an X-link extension arm 30 and a main body 31 are housed in a cylindrical case 29 having an outer diameter of 270 mm and a total length of 5,400 mm. The main body 31 has a mechanism for raising and lowering the irradiation head 12 at the laser irradiation position 18 (not shown), and the main body 31 has three degrees of freedom of horizontal rotation, horizontal extension and vertical movement. The operation stroke is ± 180 degrees of rotation, the extension is about 2,000 mm, and the elevation is about 2,000 mm, and has an operation range that can cover the entire inner wall of the shroud drum 2 when the core is installed at the center.

When the extension arm 30 is contracted, the elevating mechanism provided on the extension arm 30 and the main body 31 is accommodated in the case 29 together with the main body 31. For this reason, the holes in the core support plate 4 can pass through, and the present invention can be applied to the operation inside the shroud cylinder 2 below the core support plate 4.

FIG. 9 shows that the lower welded portion of the shroud cylinder 2 is used as the working surface 16, the light guide member 9 is extended vertically, and the irradiation head 1 is
8 shows a state in which the construction 2 is opposed to the construction surface 16, and the other configuration is essentially the same as that in FIG.

Next, a fifth embodiment of the laser maintenance / repair device according to the present invention will be described with reference to FIG.

This embodiment is different from the first embodiment in that the first to fourth light guide members 9a to 9d have a sufficient liquid-tight structure and are rotatably attached to the light guide members 9b and 9c. Are mutually rotatable structures, and the light guide members 9c and 9d attached so as to be freely extendable are formed in a structure that can be extended while maintaining mutual liquid tightness.

That is, a pair of upper and lower bearings 32 are provided on the outer peripheral surface of the second light guide member 9b so as to be rotatable. An O-ring 33 is provided and the third light guide member 9c is provided.
Has a liquid-tight structure with the upper outer surface. A motor 34 for rotational drive is provided outside the second light guide member 9b, and a first gear 35a is provided on a rotating shaft of the motor 34, and a second gear 35 which meshes with the first gear 35a and rotates. Gear 35b is provided on the upper outer peripheral surface of the third light guide member 9c.

Further, a flange 36 is provided at the upper end of the fourth light guide member 9d including the second reflection member 13b inserted into the third light guide member 9c, and an O-ring is formed on the outer surface of the flange 36. 37 and the third light guide member 9c
An inner annular body 38 is formed on the inner surface of the lower end of the
An O-ring 37 is fitted to the upper surface 8 and a pair of upper and lower O-rings 37 maintain liquid tightness between the third light guide member 9c and the fourth light guide member 9d.

In this embodiment, the bearing 32 and the O
The second light guide member 9b and the third light guide member 9c, which are rotatable with each other by the rotating mechanism 10a including the motor 34 and the gears 35a and 35b, while maintaining the liquid tightness by the ring 33, and the O-ring 37. The third light guide member 9c and the fourth light guide member 9d which can be mutually expanded and contracted by the expansion and contraction mechanism 11a while keeping the inside liquid-tight.

Therefore, according to the present embodiment, since the laser beam 15 travels through the air with less loss than underwater, the loss can be further reduced and the output of the laser oscillator 7 can be reduced. Alternatively, the irradiation head 12
As long as the optical intensity of the optical system permits, the output of the laser oscillator 7 can be increased.

Next, a sixth embodiment of the laser maintenance / repair device according to the present invention will be described with reference to FIGS. 11 (a) and 11 (b).

In this embodiment, the first motor 39 and the second motor 40 are provided in the light guide member 9 so that the reflection member provided in the light guide member 9 can be rotatably positioned by remote control.
It has been provided.

According to the present embodiment, the actuator of the reflecting member 13 and the first and second motors 39 and 40 serving as the alignment measuring device are provided so that the angle of the reflecting member 13 can be adjusted remotely. Thus, the positioning mechanism is rotatable about axes perpendicular to each other. This alignment mechanism enables remote alignment even if the light guide member 9 is misaligned due to bending or the like,
Preventive maintenance and repair work can be performed in a short time without interruption. Note that a prism can be used instead of the reflecting member 13.

In the above embodiment, a tubular light guide member is used as the light guide means instead of the optical fiber.
Thereby, the laser light can be transferred in the air, and the laser light having a higher energy density than the optical fiber can be transferred. In addition, since the laser light guided inside the light guide member is substantially parallel light, the requirement for condensing at the irradiation head portion is eased.

Next, a description will be given of an embodiment in which the optical intensity of each component of the irradiation head is increased so that a laser beam having a high energy density can be irradiated.

FIG. 12 is a block diagram showing a seventh embodiment of the laser maintenance / repair device according to the present invention. As shown in FIG. 12, the irradiation head 12 of the laser maintenance / repair device installed in the liquid collects the laser beam 15 transmitted from the laser oscillator (not shown) by the light guide means. The optical member 14, an optical window 41 for sealing a liquid to keep the light collecting member 14 in the air (inside the light guide member), and a laser beam 15 that is reflected and radiated on the construction surface 16. And a reflection mirror 42 for performing the operation.

According to the laser maintenance / repair device of this embodiment, as shown in FIG. 12, the irradiation head 12 of the laser maintenance / repair device installed in the liquid has the reflection mirror 42 installed in the liquid. Since the optical window 41 is provided near the light condensing member 14, the irradiation area of the laser beam applied to the optical window 41 is increased, and the proof stress of the optical window 41 can be reduced to the energy density at which the optical window 41 is damaged. .

The reflection mirror 42 has a structure in which one laser beam is reflected not by the reflection film on the surface but by total reflection on the back surface.

FIG. 13 shows the structure of the reflection mirror 42. The reflection mirror 42 includes a transparent body 43 made of, for example, quartz glass, and a reflective layer 44 provided on the back surface of the transparent body 43.

The laser beam 15 is applied to the transparent body 43 and the reflective layer 4.
If the angle of the reflection mirror 5 is adjusted so as to be incident on the back surface of the transparent body 43 at an angle larger than the critical angle of the total reflection at the boundary of No. 4, the laser beam is removed except for a slight Fresnel reflection on the transparent body surface. Are reflected by this total reflection. At this time, the optical intensity is about 15 J / cm 2 with respect to the second high-long wave of the YAG laser, and the energy required for the construction can be sufficiently reflected.

When only a transparent body such as quartz glass is used without providing the reflection layer 44, or when the reflection mirror 42 is installed in the air, almost all of the laser light is emitted without causing total reflection. The light passes through the transparent body and cannot be used as a reflection mirror.

The reflective layer 44 may be made of any material having a refractive index sufficiently smaller than the refractive index of the transparent body 43 and, in the case of quartz glass, a refractive index of about 1.4. Of course, a vacuum layer having a refractive index of 1.0 may be used.

Further, the advantage of the reflecting mirror 42 is that not only the energy resistance is increased but also the wavelength of the laser beam reflected by the reflecting film is determined to be one. Although the critical angle changes because the refractive index of the laser beam changes depending on the wavelength, if the incident angle of the laser beam 15 is considered so as to maintain the total reflection, the laser beam 15 is not limited by the wavelength and the incident angle of the The point is that the reflection mirror 42 can be installed at an arbitrary angle within a range larger than the critical angle of reflection. Therefore, according to the reflection mirror 42, while the reflection mirror is conventionally held at only a specific angle with respect to the incident laser light, the laser is changed by changing the holding angle within a certain range. A wide range can be constructed by changing the light irradiation site.

Further, the reflection mirror 42 according to the present invention has an advantage that it can be manufactured at a low cost because a reflection film such as an expensive dielectric multilayer film is not used.

As described above, according to the present embodiment, the surface modification of the structural material in water using a laser beam of high energy density, which has been impossible until now due to the limitation of the optical intensity of the optical component with respect to the laser beam. Quality construction can be performed.

FIG. 14 is a block diagram showing an eighth embodiment of the laser maintenance / repair device according to the present invention. In the following embodiments, parts that are the same as or correspond to those in the seventh embodiment are denoted by the same reference numerals as in FIG.

As shown in FIG. 14, the irradiation head 12 of the laser maintenance / repair device installed in the liquid emits a laser beam 15 transmitted from a laser oscillator (not shown) via a light guide. It is composed of a converging member 14 which converges and constitutes an element for sealing the light guide means in a liquid-tight manner, and a reflecting mirror 42 for reflecting the condensed laser light 15 and irradiating the construction surface 16 with it. .

The respective components are the same as those in the above-described seventh embodiment. However, unlike the seventh embodiment, in this embodiment, the light guide means is sealed in a liquid-tight manner by the condensing member 14 without using an optical window. ing. When one surface of the light collecting member 14 is in contact with the liquid, unlike in air, the refractive index of the liquid is larger than that of air, and the focal length of the lens is longer than that of air. If the liquid was water, the focal length would be about 1.3 times. In this case, if the change in the focal length due to the liquid is predicted in advance and the position of the light collecting member 14 is adjusted, an optical window for sealing the liquid is not required, and the apparatus can be simplified.

FIG. 15 is a block diagram showing a ninth embodiment of the laser maintenance / repair device according to the present invention.

As shown in FIG. 15, the irradiation head 12 of the laser maintenance / repair device installed in the liquid receives a laser beam 15 transmitted from a laser oscillator (not shown) via a light guide. A converging member 14 constituting an element for converging and sealing the light guide means in a liquid-tight manner; a reflecting mirror 42 for reflecting the condensed laser light 15 and irradiating the construction surface 16 with laser light; It is constituted by an injection nozzle 9 for injecting a liquid for removing a causative substance onto the construction surface 16. That is, the present embodiment has a structure in which the liquid ejection nozzle 45 is added to the eighth embodiment.

When a high energy density laser beam 15 is applied to the construction surface 16, the surface of the construction part is turned into plasma, and at that time, high-temperature plasma generates bubbles. In addition, the clad and the like attached to the surface of the construction part are removed and float in the liquid. These bubbles, cladding, and the like are referred to as laser light scattering-causing substances. If they are on the optical path of the laser light 15, they will scatter the laser light 15 and cause insufficient irradiation of the construction surface 16.

Therefore, a clean liquid obtained by filtering impurities through a filter is sprayed toward the construction surface 16 under construction, and a liquid jet nozzle 45 for removing bubbles on the construction surface 16 and clad on the optical path is provided. Laser light scattering substances such as laser beam and cladding are removed from the irradiated part and the laser beam path so that the laser beam 15 having sufficient energy
Can be irradiated.

Further, the irradiation head 12 removes bubbles and the like on the surface of the light collecting member 14 so that air bubbles and dust do not stay near the light collecting member 14, and a hole for removing bubbles. It is preferable to provide a contrivance such as providing

FIG. 16 is a block diagram showing a tenth embodiment of the laser maintenance / repair device according to the present invention.

As shown in FIG. 16, the irradiation head 12 of the laser maintenance / repair device installed in the air receives a laser beam 15 transmitted from a laser oscillator (not shown) via a light guide. A converging member, a condensing member 14 constituting an element for sealing the light guide means in a liquid-tight manner, a reflecting mirror 42 for reflecting the converged laser light 15 and irradiating the construction surface 16 in the air, It is constituted by a liquid jet nozzle 46 that forms a liquid layer on the surface of the laser irradiation part.

In the process of improving the surface residual stress of the structural material, a liquid for confining the pressure of the plasma is required. In such a process, it is necessary to irradiate the laser beam 15 to the processing surface 16 in the liquid. However, in this embodiment, the construction surface 1
6, the liquid is jetted from the jet nozzle 46 to form a liquid layer 47 on the irradiation surface. By doing so, it is possible to carry out the construction even in the air. According to the present embodiment, construction can be performed even when the liquid is removed for another construction or when the liquid is not yet filled during the construction work.

FIG. 17 is a block diagram showing an eleventh embodiment of the laser maintenance / repair device according to the present invention.

As shown in FIG. 17, the irradiation head 12 of the laser maintenance / repair device installed in the liquid has a light guiding means 8k.
It is integrally formed with the tip portion in a cylindrical shape. In addition, it has a structure in which it can be rotated in the circumferential direction or moved in the axial direction by a driving mechanism.

A laser beam from a laser oscillator (not shown) passes through the light guide means 8 and is irradiated from the irradiation head 12 in the lateral direction. According to such a structure, when the inner surface (construction surface 16) of a tubular construction such as a pipe is constructed, the distal end portion of the light guide means 8 and the irradiation head 12 are formed into a cylinder thinner than the inner diameter of the pipe. In this way, it is possible to construct a part that was difficult to construct in the past.

FIG. 18 is a block diagram showing a twelfth embodiment of the laser maintenance / repair device according to the present invention.

As shown in FIG. 18, the irradiation head 12 of the laser maintenance / repair device installed in the liquid emits a laser beam 15 transmitted from a laser oscillator (not shown) via a light guide. Along with the convergence, a light collecting member 14 constituting an element for sealing the light guide means in a liquid-tight manner, a reflecting mirror 42 for reflecting the collected laser light 15 and irradiating the construction surface 16 with a light, and a reflecting mirror 42 It is constituted by a positioning mechanism 48 for driving.

By the positioning mechanism 48, the reflecting mirror 42 can reflect and irradiate the laser beam 15 in an arbitrary direction. When the linear or planar construction surface 16 is constructed with such a structure, the irradiation head 12 is enlarged by incorporating the alignment mechanism 48 into the irradiation head 12, but the irradiation head 12 is driven. The mechanism can be stopped during irradiation, so that errors in the irradiation position due to continuous continuous driving can be prevented, and the optical axis can be set at an arbitrary angle such as an oblique direction. Irradiation can be performed.

According to the present embodiment, the disadvantage of the conventional reflecting mirror which can reflect only at a certain angle can be overcome, and if the angle with respect to the high energy density laser beam 15 is larger than the critical angle, any angle can be used. The reflection mirror can be driven to be adjusted to the angle of 、, and the laser light irradiation site can be changed by changing the angle of the reflection mirror, and processing with precise laser light becomes easy.

FIG. 19 is a configuration diagram showing a thirteenth embodiment of the laser maintenance / repair device according to the present invention.

As shown in FIG. 19, in the present embodiment, the laser light guiding means and the driving device for supporting the irradiation head are separated.

According to the present embodiment, the irradiation head 12 of the laser maintenance / repair device is installed in the liquid, and the laser light is transferred from the laser oscillator 7 using the optical fiber 49 as the light guide means, and the work surface is installed. Irradiate 16.

On the other hand, the irradiation head 12 is
The laser beam is driven up, down, left, and right to sequentially irradiate a linear or planar construction surface 16 with a laser beam.

With such a structure, the laser light can be transmitted by the flexible optical fiber 49 to the construction portion which becomes a complicated optical waveguide which cannot be directly seen through, so that it is curved into a complicated shape. Laser light can be sent through the optical waveguide, and construction can be performed even on a construction section ahead of such an optical waveguide.

[0142]

According to the laser maintenance / repair device according to the first aspect of the present invention, since the laser light is guided by the tubular light guide member instead of the optical fiber, the laser light generally passes through the air. The laser beam can be transmitted at a higher energy density than the optical fiber.

In the case where laser light is transmitted spatially, parallel light is easily obtained, so that the requirement that the magnification must be reduced is relaxed, and the depth of focus can be increased, so that the requirement of positioning accuracy is relaxed.

Further, since the light guiding means is provided with a swiveling mechanism, it is easy to bring the irradiation head close to the construction surface and to face the same. Light can be sent to the illumination head.

Therefore, according to the laser maintenance / repair device of the present invention, if this laser maintenance / repair device is used in a reactor vessel or the like, the construction surface in the reactor pressure vessel including the reactor internal structure or the nozzle portion can be used. Preventive maintenance and repair work such as laser peening, melting, cladding and welding can be performed.

According to the laser maintenance / repair device according to the second aspect of the present invention, since the laser oscillator is housed in the watertight container, the distance between the laser oscillator and the work surface can be reduced in underwater work, and the laser light Transmission loss can be reduced. In addition, since the distance between the laser oscillator and the working surface is short, it is easy to increase the positioning accuracy, and it is possible to shorten the light guide member requiring the relative position accuracy, thereby facilitating the installation work.

In the laser maintenance / repair device according to the third aspect of the present invention, a center post is erected on an upper lattice plate above a shroud body in a reactor pressure vessel, and a laser irradiating device is formed by a turning device and a movable cart of the center post. , The irradiation head has three degrees of freedom of swiveling, horizontal extension and elevating, and can irradiate the laser light to the construction surface with certainty. This allows laser peening, melting, Preventive maintenance and repair work such as cladding and welding can be performed.

In the laser maintenance / repair device according to the fourth aspect of the present invention, a vertical wheel and a horizontal wheel that are in contact with the upper edge of the shroud body are attached to the tip of the turning device of the center post.

According to this laser maintenance / repair device, the turning device can be smoothly turned by the vertical and horizontal wheels running on the upper edge of the shroud body.
Since the positioning of the irradiation head is facilitated, maintenance and repair work in the reactor can be easily performed.

In the laser maintenance / repair device according to the fifth aspect of the present invention, a remote drive device is provided on an upper lattice plate above a shroud body in a reactor pressure vessel, and a laser irradiation device is provided on the remote drive device.

According to the present invention, it is easy to move the irradiation head over the entire inner wall of the shroud body by a remote driving device having three degrees of freedom of horizontal turning, horizontal extension and vertical movement, and a series of maintenance such as inspection and repair. In addition, the repair work can be continuously and efficiently performed.

Further, by setting the size of the remote driving device to a size that can be inserted from the hole of the core support plate, the work inside the shroud below the core support plate can be performed.

The laser maintenance / repair device according to claim 6 of the present application is provided on the outer surface of the light guide member, a bearing, an O-ring, a motor for rotational driving, a gear attached to the rotating shaft of the motor, and the outer surface of the light guide member. By providing such gears, one of the light guide members and the other member can rotate and expand and contract, and the light guide member can be kept liquid-tight during the rotational expansion and contraction operation. This makes it possible to obtain a laser maintenance / repair device that can be installed in liquid.

In the laser maintenance / repair device according to the seventh aspect of the present invention, the reflecting member in the light guide member is provided with a positioning mechanism rotatable about axes orthogonal to each other by the first and second motors. .

According to the present invention, the angle of the reflection member can be changed by the above-described alignment mechanism. Therefore, even if the light guide member is displaced due to bending or the like, the operation is interrupted by adjusting the reflection member. The construction can be completed in a short time without performing.

In the laser maintenance / repair device according to claim 8 of the present application, in the irradiation head, the optical window is an element of the liquid-tight structure of the light guide means, and the optical window is provided inside or outside the light guide means of the optical window. A condensing member is arranged, and a reflection mirror for reflecting the laser light condensed by the condensing member is provided.
Furthermore, the reflection mirror has a transparent body and a reflective layer provided on the back surface of the transparent body, and reflects the laser light by total reflection at the boundary between the transparent body back surface and the reflective layer.

According to the present invention, the optical window is arranged near the light converging member, so that the area of the optical window irradiated with the laser beam can be increased and the energy density of the laser beam can be reduced. That is, the energy of the laser light that can be transferred by the light guiding means can be increased.

Further, the reflecting mirror according to the present invention reflects the laser beam by total internal reflection at the boundary between the back surface of the transparent body and the reflecting layer, so that the engineering strength of the reflecting film on the reflecting mirror surface is not restricted. Thus, a laser beam having a high energy density can be used.

In the laser maintenance / repair device according to the ninth aspect of the present invention, since the light collecting member also serves as the optical window, the optical window is not required. That is, it is possible to simplify the structure, completely eliminate the limitation due to the optical intensity of the optical window, and obtain a laser maintenance / repair device capable of transmitting a high energy density laser beam.

In the laser maintenance / repair device according to the tenth aspect of the present invention, since the irradiation head is provided with the liquid jet nozzle for removing the substance causing laser light scattering in the application section, air bubbles or dust generated in the application section are removed. It is possible to efficiently irradiate the laser beam to the construction section.

In the laser maintenance / repair device according to the eleventh aspect of the present invention, since the irradiation head is provided with the liquid jet nozzle for forming a liquid layer on the surface of the laser irradiation part, the same processing as in liquid even in air is possible. Becomes

In the laser maintenance / repair device according to the twelfth aspect of the present invention, the irradiation head is formed integrally with the tip of the light guide means in a cylindrical shape, and the light guide means is provided with a circumferential rotation and an axial expansion / contraction operation. Since the mechanism for applying the light is provided, the processing can be performed while rotating the irradiation head in the circumferential direction or moving in the axial direction. In particular, the inner surface of the tubular construction portion can be easily processed.

In the laser maintenance / repair device according to the thirteenth aspect of the present invention, since the reflection mirror of the irradiation head is provided with a positioning mechanism rotatable about axes orthogonal to each other by the first and second motors, It is possible to drive the laser beam in an angle range in which the angle of incidence of the light on the reflection mirror is larger than the critical angle of total reflection, and reflect the laser beam in an arbitrary direction for processing. This makes it possible to obtain a laser maintenance / repair device capable of continuously processing a wide range of construction parts without moving the irradiation head.

In the laser maintenance / repair device according to the fourteenth aspect of the present invention, the light guide means is made of an optical fiber, and the irradiation head is supported by a support driving device for imparting horizontal turning, horizontal stretching, vertical turning, and vertical stretching operations. Therefore, even in an optical waveguide having a complicated shape that cannot be directly seen through, it is possible to easily transmit a laser beam to a construction portion.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an overall configuration and an installation example of a first embodiment of a laser maintenance / repair device of the present invention.

FIG. 2 is a diagram showing a configuration of a first embodiment of the laser maintenance / repair device of the present invention.

FIG. 3 is a longitudinal sectional view showing an entire configuration and an installation example of a second embodiment of the laser maintenance / repair device of the present invention.

FIG. 4 is a diagram showing a configuration of a second embodiment of the laser maintenance / repair device of the present invention.

FIG. 5 is a longitudinal sectional view showing an entire configuration and an installation example of a third embodiment of the laser maintenance / repair device of the present invention.

FIG. 6 is an enlarged cross-sectional view showing a configuration of a distal end portion of a center post turning device according to a third embodiment of the laser maintenance / repair device of the present invention.

FIG. 7 is a longitudinal sectional view showing a modification of the third embodiment of the laser maintenance / repair device of the present invention.

FIG. 8 is a longitudinal sectional view showing an entire configuration and an installation example of a fourth embodiment of the laser maintenance / repair device of the present invention.

FIG. 9 is a longitudinal sectional view showing a laser maintenance / repair device according to a fourth embodiment of the present invention while a weld at a lower portion of a shroud barrel is being constructed.

FIG. 10 is a longitudinal sectional view showing the configuration of a fifth embodiment of the laser maintenance / repair device of the present invention.

FIG. 11 is a view showing a reflection member positioning mechanism in a laser maintenance / repair device according to a sixth embodiment of the present invention.

FIG. 12 is a longitudinal sectional view showing the configuration of a seventh embodiment of the laser maintenance / repair device of the present invention.

FIG. 13 is a longitudinal sectional view showing a configuration of a reflection mirror according to a seventh embodiment of the laser maintenance / repair device of the present invention.

FIG. 14 is a longitudinal sectional view showing the configuration of an eighth embodiment of the laser maintenance / repair device of the present invention.

FIG. 15 is a longitudinal sectional view showing a configuration of a ninth embodiment of the laser maintenance / repair device of the present invention.

FIG. 16 is a longitudinal sectional view showing a configuration of a tenth embodiment of the laser maintenance / repair device of the present invention.

FIG. 17 is a longitudinal sectional view showing a configuration of an eleventh embodiment of the laser maintenance / repair device of the present invention.

FIG. 18 is a longitudinal sectional view showing a configuration of a twelfth embodiment of the laser maintenance / repair device of the present invention.

FIG. 19 is a longitudinal sectional view showing a configuration of a thirteenth embodiment of the laser maintenance / repair device of the present invention.

FIG. 20 is a longitudinal sectional view showing a configuration of a conventional laser processing apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 reactor pressure vessel 2 shroud barrel 2 a upper edge of shroud 3 upper grid plate 4 core support plate 5 operation floor 6 laser power supply 7 laser oscillator 8 light guide means 9 a first light guide member 9 b second light guide member 9 c Third light guide member 9d Fourth light guide member 9e Fifth light guide member 9f Sixth light guide member 9g Seventh light guide member 9h Eighth light guide member 10a First rotating mechanism 10b Second Rotating mechanism 11a First telescopic mechanism 11b Second telescopic mechanism 12 Irradiation head 13a First reflective member 13b Second reflective member 13c Third reflective member 14 Condensing member 15 Laser light 16 Construction surface 17 Cable line 18 Laser Irradiation device 19 Watertight container 20 Laser transmission window 21 Center post 22 Swivel device 23 Rail 24 Moving trolley 25 Vertical wheels 26 Horizontal vehicle 27 Horizontal wheel mounting member 28 Remote drive device 29 Cylindrical case 30 Extension arm 31 Main body 32 Bearing 33 O-ring 34 Motor 35a First gear 35b Second gear 3 36 Flange 37 O-ring 38 Inner annular body 39 First Motor 40 Second motor 41 Optical window 42 Reflecting mirror 43 Transparent body 44 Reflecting layer 45 Liquid ejecting nozzle 46 Liquid ejecting nozzle 47 Liquid layer 48 Alignment mechanism 49 Optical fiber 50 Support driving device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Sano 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside the Toshiba Yokohama office (72) Inventor Shigehiko Mukai Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa No. 8 Inside Toshiba Yokohama Office (72) Inventor Makoto Shima 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside Toshiba Yokohama Office (72) Inventor Masaki Yoda Small Koyuki-ku, Kawasaki-shi, Kanagawa Muko Toshiba 1 Inside the Toshiba R & D Center (72) Inventor Katsuhiko Sato 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Pref. Toshiba Yokohama Office (72) Inventor Muneyoshi Kikunaga Kawasaki, Kanagawa 66-2 Horikawa-cho, Ichiko-ku Toshiba Engineering Corporation

Claims (14)

[Claims] 1. A laser oscillator comprising: a laser oscillator; light guide means connected to guide laser light from the laser oscillator; and an irradiation head for condensing laser light from the light guide means and irradiating the laser beam to a construction section. In the laser maintenance / repair device, the light guide means has a liquid-tight tubular light guide member, a reflection member is provided inside the light guide member, and the light guide member is horizontally turned and horizontally expanded and contracted. A laser maintenance / repair device characterized in that at least one of the mechanisms for imparting vertical rotation and vertical expansion / contraction operations is provided. 2. A laser power source installed outside the reactor pressure vessel, and a laser irradiation device installed inside the reactor pressure vessel connected to the laser power source, wherein the laser irradiation device is connected to the laser power source. Laser oscillator, a watertight container containing the laser oscillator and having a laser transmission window, a light guide unit connected to the laser transmission window of the watertight container, and a laser beam from the light guide unit. An irradiation head for irradiating the light-tight container, wherein the light-guiding means has a liquid-tight tubular light-guiding member connected in series to the water-tight container, and reflects light inside these light-guiding members. A member is provided, and the light guide member is horizontally turned,
A laser maintenance / repair apparatus characterized in that at least one of mechanisms for imparting horizontal expansion / contraction, vertical rotation, and vertical expansion / contraction is provided. 3. A center post is erected on an upper lattice plate above a shroud body in a reactor pressure vessel, and a turning device is provided on the center post so as to be able to turn horizontally, and the turning device is movably moved in a horizontal direction. 3. The laser maintenance / repair device according to claim 2, wherein a truck is provided, and the laser irradiation device is mounted on the movable truck. 4. The laser maintenance / repair device according to claim 3, wherein a vertical wheel and a horizontal wheel that are in contact with the upper edge of the shroud body are attached to a tip portion of the turning device. 5. A remote drive having a horizontal turning, horizontal extension and up-and-down elevating mechanism is provided on an upper lattice plate above a shroud barrel in the reactor pressure vessel, and the laser irradiation device is provided on the remote drive. 3. The laser maintenance / repair device according to claim 2, wherein: 6. A rotating mechanism for imparting the turning operation includes: a bearing and an O-ring provided on an outer surface of the light guide member;
The laser maintenance device according to any one of claims 1 to 5, comprising a motor for rotational driving, and a gear provided on an outer surface of the light guide member meshing with a gear attached to a rotating shaft of the motor.・ Repair equipment. 7. A reflection mechanism in the light guide member, wherein an alignment mechanism rotatable about axes orthogonal to each other by a first motor and a second motor is provided.
7. The laser maintenance / repair device according to any one of items 6 to 6. 8. A laser oscillator, a light guiding means connected to guide laser light of the laser oscillator, and an irradiation head for condensing the laser light from the light guiding means and irradiating the laser beam to a construction section. In the laser maintenance / repair device, the irradiation head is provided at an end of an optical waveguide of the light guide means, forms an element for sealing the light guide means, and transmits a laser beam; and a light guide for the optical window. A light-collecting member that is disposed inside the light-guiding means or outside the light-guiding means and collects laser light; and a reflecting mirror that reflects the laser light condensed by the light-collecting member and irradiates the construction part with the light. The mirror has a transparent body and a reflective layer made of a vacuum or a predetermined fluid provided on the back surface of the transparent body, and a laser is formed by total reflection at a boundary between the transparent body back surface and the reflective layer. Laser maintenance and repair apparatus characterized by reflecting the. 9. A laser oscillator, a light guide means connected to guide laser light of the laser oscillator, and an irradiation head for condensing the laser light from the light guide means and irradiating the laser beam to a construction section. In the laser maintenance / repair device, the irradiation head is provided at an end of an optical waveguide of the light guide means and serves as an element for sealing the light guide means and collects laser light. The reflection mirror is configured to reflect the laser light condensed by and irradiate the construction portion, the reflection mirror, a transparent body, and a reflective layer made of a vacuum or a predetermined fluid provided on the back surface of the transparent body And a laser beam reflecting by total reflection at a boundary between the back surface of the transparent body and the reflection layer. 10. The laser maintenance / repair apparatus according to claim 8, wherein said irradiation head has a liquid jet nozzle for removing a substance causing laser light scattering in a working portion. 11. The laser maintenance / repair apparatus according to claim 8, wherein the irradiation head has a liquid jet nozzle for forming a liquid layer on the surface of the laser irradiation section. 12. The irradiation head is formed integrally with the tip of the light guide means in a cylindrical shape, and the light guide means has a mechanism for imparting rotation in the circumferential direction and expansion and contraction in the axial direction. The laser maintenance / repair device according to any one of claims 8 to 11, wherein an inner surface of the construction is machined. 13. A reflection mirror of the irradiation head, comprising:
13. The laser maintenance / repair device according to claim 8, further comprising a positioning mechanism rotatable about axes orthogonal to each other by the second motor. 14. The light guide means is made of an optical fiber, and the irradiation head is supported by a support driving device having at least one of a mechanism for imparting horizontal rotation, horizontal expansion / contraction, vertical rotation, and vertical expansion / contraction operation. The laser maintenance / repair device according to any one of claims 8 to 13, wherein: