JP6681199B2 - Laser irradiation device - Google Patents

Description

The present invention relates to a laser irradiation equipment, in particular, it relates to a laser irradiation equipment suitable for sanding process.

  For example, bolts and nuts are often used as fasteners at joints of steel structures such as bridges. Since such bolts and nuts are generally exposed to wind and rain, their surfaces are often coated with rustproofing or the like. In addition, since the coating film deteriorates and the surface is coated with oxides and dirt due to long-term use, periodic maintenance such as cleaning and repainting is required. In addition, when repainting a coating, it is common to remove or remove an old coating film or an adhering substance by a keren treatment and then apply a new coating.

  By the way, the bolt head and the nut are protrusions having a shape protruding from the surface of the steel structure, and the work of peeling off the coating film on the surface itself is troublesome. In addition, it is particularly difficult to peel off the coating film that has entered the corners formed by the bolt head or nut and the surface of the steel structure.

  For such keren treatment, generally, in addition to manual work using an electric tool, shot blast or the like in which a projectile such as iron particles or sand particles is sprayed onto the surface of the structure is used. However, manual work using an electric tool tends to lengthen the work time, and the method using shot blast has a problem that a large amount of waste and noise are generated. Therefore, in recent years, methods using laser light have been studied (for example, refer to Patent Document 1). In the invention described in Patent Document 1, an attachment provided with a mirror on the tip inner peripheral surface is arranged on the surface of the structure from which the bolt head protrudes, and the laser light is reflected by the mirror to irradiate the side surface of the bolt head. ing.

Patent No. 5574354

  However, since the coating film and the surface coating material stick to the surface of the structure, it is necessary to increase the intensity of the laser light in order to remove them, and the coating film or the surface coating material burns. There is a possibility that it will end up. When the coating film or the surface coating material burns, the ash scatters or diffuses, and there is a problem that the work site and the laser irradiation device become dirty. When the work site or the laser irradiation device becomes dirty, the irradiation efficiency of the laser light is reduced and cleaning takes time, so that the work efficiency of the cleaning process is reduced.

The present invention has been made in view of the above problems, it is possible to suppress the burning of the coating film and the surface coating material, it is possible to improve the work efficiency of the sanding process, the laser irradiation equipment The purpose is to provide.

According to the present invention, in a laser irradiation apparatus for irradiating a laser beam to perform a keren treatment, a laser irradiation head that forms a processing space for irradiating the laser beam, and an inert gas is supplied into the laser irradiation head. a gas supply unit, e Bei and a discharge portion for discharging to the outside the interior of the gas and dust of the laser irradiation head, the laser irradiation head includes a base fixed to the location to perform the sanding process, the base board And a tubular portion connected to the first tubular portion, the tubular portion being connected to the main body portion of the laser irradiation device, and a second tubular portion connected to the tip of the first tubular portion, Wherein the second cylindrical portion is provided with a plurality of reflection mirrors for reflecting the laser light toward the object to be processed, and a gas supply path forming a part of the gas supply unit. A characteristic laser irradiation device is provided.

  The laser irradiation head may include a shield plate that partitions the processing space and transmits the laser light.

The gas supply passage may be formed so as to pass through a connecting portion between the first tubular portion and the second tubular portion and a wall surface portion of the second tubular portion and communicate with the processing space. Further, the discharging unit may be formed on the base.

The second cylindrical portion may have a shield plate at the tip that partitions the processing space and allows the laser light to pass therethrough. Further, the shielding plate is arranged at a position between the reflection mirror and the gas supply port of the gas supply path, and the gas supply path sprays the inert gas onto the surface of the shielding plate. It may be configured to.

Further, the gas supply path may be configured to spray the inert gas onto the surface of the reflection mirror.

According to the laser irradiation equipment of the present invention described above, since it has to reduce the oxygen concentration in the processing space by supplying an inert gas into the processing space is irradiated with a laser beam, the coating or surface coating material, etc. Even when irradiating a high-intensity laser beam when shaving an object stuck to the surface of a structure like the above, it is possible to suppress the combustion of a coating film or a surface coating material in the processing space. it can. Therefore, the scattering and diffusion of ash can be suppressed, the cleaning time can be shortened, the laser beam irradiation efficiency can be maintained, and the work efficiency of the cleaning process can be improved.

It is the whole lineblock diagram showing the laser irradiation device concerning a first embodiment of the present invention. It is the elements on larger scale which shows a part of bridge. It is a whole lineblock diagram showing the laser irradiation apparatus concerning a second embodiment of the present invention. It is a whole block diagram which shows the laser irradiation apparatus which concerns on 3rd embodiment of this invention. It is a partially expanded view which shows the laser irradiation apparatus which concerns on other embodiment of this invention, (a) shows 4th embodiment, (b) has shown 5th embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5B. Here, FIG. 1 is an overall configuration diagram showing a laser irradiation apparatus according to the first embodiment of the present invention. FIG. 2 is a partially enlarged view showing a part of the bridge.

  As shown in FIG. 1, the laser irradiation apparatus 1 according to the first embodiment of the present invention is an apparatus that irradiates a laser beam L to perform a cleaning process, and forms a processing space S in which the laser beam L is irradiated. A laser irradiation head 2, a gas supply unit 3 for supplying an inert gas G to the inside of the laser irradiation head 2, and an exhaust unit 4 for exhausting the gas and dust inside the laser irradiation head 2 to the outside. There is.

  The kelen treatment is, for example, a treatment for removing or removing a coating film or a surface coating material coated on the surface of the protrusion P, rust or the like generated on the surface of the protrusion P. The protrusion P is fixed to, for example, a joint portion of a steel structure such as a bridge. As shown in FIG. 2, the bridge 5 includes, for example, a main girder 51 made of I-shaped steel, a splicing plate 52 arranged at a joint portion of a web portion of the main girder 51, and a flange portion of the main girder 51. And a flange connecting plate 53 arranged at the joint part of the. When the main girders 51 are butted and joined together, a plurality of bolts 54 and nuts 55 are used for the splicing plate 52 and the flange connecting plate 53. The protrusion P is composed of, for example, a bolt 54 and a nut 55 protruding from the surface of the steel material forming the main girder 51.

  The protrusion P is not limited to the one configured by the bolt 54 and the nut 55, and is intended to include various protrusions protruding on the surface of the structure such as the shape of the rivet and the structure. Further, the structure is not limited to a steel structure such as a bridge and may be another structure such as a concrete structure.

  Further, the cleaning treatment according to the present embodiment is not limited to the treatment for cleaning the surface of the projection P, and for example, the treatment for cleaning a flat painted surface or a paved surface such as a steel structure or a concrete structure. It may be a treatment for suspending concrete, resin, lining or the like of the structure, or a treatment for cleaning or decontaminating the structure.

The laser irradiation device 1 includes, for example, a main body 11 including a laser oscillator such as a CO ₂ laser, a fiber laser, a YAG laser, a laser irradiation head 2 connected to the main body 11, a main body 11 and a laser irradiation head 2. And a supporting portion 12 for supporting the movable body in a vertically movable manner. The laser oscillator can be arbitrarily selected and used according to the types of the structures and the protrusions P and the target of the cleaning process.

  The laser irradiation head 2 includes, for example, as shown in FIG. 1, a base 21 that is fixed at a place where the cleaning process is performed, and a cylindrical portion 22 that is connected to the base 21. The base 21 is formed on, for example, a wall surface portion 21a that surrounds the outer periphery of the protrusion P to be subjected to the kelen treatment, a bottom surface portion 21b that is disposed at the lower end of the wall surface portion 21a and abuts the surface of the structure, and an upper end of the wall surface portion 21a. And a flange portion 21c that has been formed. The wall surface portion 21a is designed to have a height such that at least another bolt 54 adjacent to the protrusion P to be subjected to the kelen treatment does not interfere with the flange portion 21c.

  A magnet 21d that is attracted to the surface of the structure having the protrusion P may be embedded in the bottom surface portion 21b. By using a magnet as the fixing means of the base 21, the base 21 can be easily fixed to the surface of the steel material, and in particular, the protrusion fixed to the connecting portion of the web portion of the main girder 51 shown in FIG. The laser irradiation device 1 can also be laterally fixed to P. The fixing means of the base 21 is not limited to the magnet, and a suction cup or a fixing jig may be used. If the wall surface portion 21a has a sufficient thickness, the bottom surface portion 21b may be omitted and the magnet 21d may be embedded in the wall surface portion 21a.

  The support portion 12 is arranged on the flange portion 21c. The support portion 12 is connected to, for example, a linear actuator 12a fixed on the flange portion 21c, a header 12b fixed to the tip of the linear actuator 12a, a guide 12c for guiding the movement of the header 12b, and a header 12b. And a restraint portion 12d that restrains the laser irradiation head 2. Note that, in FIG. 1, the restraint portion 12d is shown by a dotted line for convenience of description.

  The header 12b has, for example, an L-shaped cross section, and is connected to the tip end of the linear motion actuator 12a and the guide 12c arranged on the side surface of the linear motion actuator 12a. The restraint portion 12d is formed, for example, in a substantially annular shape, and restrains the laser irradiation head 2 by coming into contact with the outer peripheral surface of the laser irradiation head 2 and being tightened.

  The support portion 12 can move the main body portion 11 and the laser irradiation head 2 toward or away from the target of swelling by operating the linear motion actuator 12a. By such an operation, the irradiation position of the laser light L can be mechanically adjusted. The focus of the laser light L is adjusted by the optical system inside the main body 11.

  The tubular portion 22 is connected to, for example, a first tubular portion 22a that is connected to the main body portion 11 of the laser irradiation device 1 and forms a space through which the laser light L passes, and a flange portion at the tip of the first tubular portion 22a by a bolt or the like. And a second tubular portion 22b. The first tubular portion 22a and the second tubular portion 22b have a substantially cylindrical shape, but are not limited to such shapes.

  On the inner surface of the second tubular portion 22b, a plurality of reflection mirrors 22c that reflect the laser light L toward the protrusion P are arranged at predetermined intervals in the circumferential direction. The inclination angle of the reflection mirror 22c may be a constant angle or may be adjustable. When the upper surface of the protrusion P is to be scraped off, the laser light L may be directly emitted from the main body 11 without being reflected by the reflection mirror 22c.

  The gas supply unit 3 includes, for example, a gas supply passage 31 formed in the tubular portion 22, a gas tank 32 that stores the inert gas G, and a pump 33 that supplies the inert gas G from the gas tank 32 to the gas supply passage 31. , Are provided. The gas tank 32 and the pump 33 may be arranged in a position close to the laser irradiation device 1 or may be arranged in a separated position.

  The gas supply passage 31 is formed, for example, so as to penetrate the flange portion of the first tubular portion 22a and the wall surface portion of the second tubular portion 22b and communicate with the processing space S. The gas supply passages 31 are formed at a plurality of positions in the circumferential direction of the second tubular portion 22b at predetermined intervals. The configuration of the gas supply path 31 shown in the figure is merely an example, and the present invention is not limited to this configuration.

  The discharge unit 4 is, for example, a discharge passage 41 formed in the base 21, a collection tank 42 that collects gas and dust, and a pump 43 that connects the discharge passage 41 and the collection tank 42 to suck the inside of the processing space S. And are equipped with. The recovery tank 42 and the pump 43 may be arranged at a position close to the laser irradiation device 1 or may be arranged at a separated position.

  The discharge path 41 is formed, for example, so as to penetrate the wall surface portion 21a and the flange portion 21c of the base 21 and communicate with the processing space S. The discharge opening of the discharge path 41 facing the processing space S may be formed in a slit shape having a wide width because it is necessary to suck the dust containing the debris generated by the cleaning process. The discharge ports are formed at predetermined intervals at a plurality of positions in the circumferential direction of the wall surface portion 21a. As shown in the figure, the outlets of the discharge passages 41 may be integrated at one location of the flange portion 21c, and the discharge passages 41 may be branched in the wall surface portion 21a to communicate with a plurality of discharge outlets. The illustrated configuration of the discharge path 41 is merely an example, and the present invention is not limited to this configuration.

  In the present embodiment, the gas supply unit 3 is formed on the cylindrical portion 22, and the discharge unit 4 is formed on the base 21. With this configuration, it is possible to easily use the wall surface portion of the cylindrical portion 22, the wall surface portion 21a of the base 21, and the like, and easily secure a sufficient flow path for supplying the inert gas G and discharging gas and dust. it can.

  According to the laser irradiation apparatus 1 described above, the laser irradiation head 2 is arranged so as to cover the protrusion P that is the target of the cleaning, and the processing space S that can be irradiated with the laser light L is formed. Since the inert gas G is supplied to the processing space S, the air in the processing space S can be replaced with the inert gas G, and the oxygen concentration in the processing space S can be reduced. Therefore, even when the high-intensity laser beam L is irradiated, it is possible to suppress the combustion of the coating film, the surface coating material, and the like.

  Further, the air in the processing space S can be easily replaced by the inert gas G by discharging the air in the processing space S before the kelen treatment by the discharge unit 4. At this time, the atmosphere in the processing space S does not need to be filled with the inert gas G as long as the oxygen concentration can be reduced to such an extent that the coating film, the surface coating material and the like do not burn. Further, by sucking the inside of the processing space S by the discharging unit 4 during the cleaning process, the dust generated by the cleaning process can be easily discharged to the outside.

  As described above, according to the laser irradiation apparatus 1 and the combustion suppression method according to the present embodiment, by suppressing the combustion of the coating film, the surface coating material, and the like in the processing space S, it is possible to suppress the scattering and diffusion of ash. Therefore, the cleaning time can be shortened, the irradiation efficiency of the laser light L can be maintained, and the work efficiency of the cleaning process can be improved.

  Next, the laser irradiation apparatus 1 according to the second embodiment of the present invention will be described with reference to FIG. Here, FIG. 3 is an overall configuration diagram showing a laser irradiation apparatus according to the second embodiment of the present invention. The same components as those in the first embodiment described above are designated by the same reference numerals, and duplicate description will be omitted.

  In the laser irradiation apparatus 1 according to the second embodiment shown in FIG. 3, the laser irradiation head 2 is provided with a shielding plate 23 that partitions the processing space S and transmits the laser light L. Specifically, the shielding plate 23 is arranged so as to seal the opening of the tubular portion 22 (second tubular portion 22b) of the laser irradiation head 2. The shield plate 23 is made of, for example, a glass plate, but may be made of other materials.

  Further, it is preferable that the shield plate 23 is disposed near the tip of the tubular portion 22 (second tubular portion 22b), specifically, at a position between the reflection mirror 22c and the gas supply port of the gas supply passage 31. By disposing the shielding plate 23 at such a position, the volume of the processing space S can be reduced, and the inert gas G is shielded when the inert gas G is supplied from the gas supply passage 31 to the processing space S. It can be easily sprayed onto the surface of 23.

  By thus reducing the volume of the processing space S, the amount of the inert gas G supplied to the processing space S can be reduced, and the suction force for sucking the inside of the processing space S can be reduced. Therefore, the gas tank 32 and the recovery tank 42 can be downsized, and the pumps 33 and 43 can be downsized.

  Further, as described above, since the gas supply unit 3 is configured to spray the inert gas G on the surface of the shield plate 23, the surface of the shield plate 23 can be cleaned with the inert gas G. Therefore, it is possible to suppress the temperature rise due to the adhered matter on the surface of the shield plate 23, and it is possible to suppress the reduction of the irradiation efficiency of the laser light L.

  Further, in the present embodiment, the inert gas G is radially supplied from the outer edge portion toward the center along the surface of the shielding plate 23, but the present invention is not limited to such a configuration. For example, the supply port of the gas supply path 31 may be inclined upward so that the inert gas G is jetted more strongly to the surface of the shield plate 23.

  Next, a laser irradiation apparatus 1 according to the third embodiment of the present invention will be described with reference to FIG. Here, FIG. 4 is an overall configuration diagram showing a laser irradiation apparatus according to the third embodiment of the present invention. The same components as those in the first embodiment described above are designated by the same reference numerals, and duplicate description will be omitted.

  The laser irradiation apparatus 1 according to the third embodiment shown in FIG. 4 has the gas supply path 31 configured to spray the inert gas G onto the surface of the reflection mirror 22c in the laser irradiation apparatus 1 according to the first embodiment. It was done. According to this embodiment, the surface of the reflection mirror 22c can be cleaned with the inert gas G, the temperature rise due to the adhered matter on the surface of the reflection mirror 22c can be suppressed, and the irradiation efficiency of the laser light L is reduced. Can be suppressed.

  Next, a laser irradiation apparatus 1 according to another embodiment of the present invention will be described with reference to FIGS. 5 (a) and 5 (b). Here, FIG. 5 is a partially enlarged view showing a laser irradiation apparatus according to another embodiment of the present invention, (a) showing a fourth embodiment and (b) showing a fifth embodiment. The same components as those in the first embodiment described above are designated by the same reference numerals, and duplicate description will be omitted. Further, in each drawing, for convenience of description, the drawings of the main body portion 11, the support portion 12, the gas tank 32, the pump 33, the recovery tank 42, and the pump 43 are omitted.

  In the laser irradiation device 1 according to the fourth embodiment shown in FIG. 5A, both the gas supply passage 31 and the discharge passage 41 are formed in the tubular portion 22 of the laser irradiation head 2. For example, a plurality of gas supply passages 31 and exhaust passages 41 are alternately arranged in the circumferential direction of the tubular portion 22. According to this embodiment, the gas supply unit 3 and the discharge unit 4 can be integrated in the tubular portion 22, and the base 21 can be easily handled.

  In the laser irradiation apparatus 1 according to the fifth embodiment shown in FIG. 5B, both the gas supply passage 31 and the discharge passage 41 are formed on the base 21 of the laser irradiation head 2. For example, a plurality of gas supply passages 31 and exhaust passages 41 are alternately arranged in the circumferential direction of the wall surface portion 21a. According to this embodiment, the gas supply unit 3 and the discharge unit 4 can be integrated in the base 21, and the tubular portion 22 can be easily handled.

  The present invention is not limited to the above-described embodiment, and for example, the base 21 and the tubular portion 22 may be integrally formed, and the shield plate 23 is included in the laser irradiation device 1 according to the third to fifth embodiments. Needless to say, various modifications can be made without departing from the spirit of the present invention such as the arrangement of

DESCRIPTION OF SYMBOLS 1 Laser irradiation device 2 Laser irradiation head 3 Gas supply part 4 Exhaust part 5 Bridge 11 Main body part 12 Support part 12a Direct acting actuator 12b Header 12c Guide 12d Guide part 12d Rest part 21 Base 21a Wall surface part 21b Bottom surface part 21c Flange part 21d Magnet 22 Tube Part 22a First cylinder part 22b Second cylinder part 22c Reflecting mirror 23 Shield plate 31 Gas supply path 32 Gas tank 33 Pump 41 Discharge path 42 Recovery tank 43 Pump 51 Main girder 52 Splice plate 53 Flange connecting plate 54 Bolt 55 Nut

Claims (7)

In a laser irradiation device that irradiates laser light to perform the keren treatment,
A laser irradiation head forming a processing space for irradiating the laser beam;
A gas supply unit for supplying an inert gas to the inside of the laser irradiation head,
E Bei and a discharge portion for discharging the gas inside and dust of the laser irradiation head to the outside,
The laser irradiation head includes a base that is fixed at a place where the kelen treatment is performed, and a cylindrical portion that is connected to the base.
The tubular portion includes a first tubular portion connected to a main body portion of the laser irradiation device, and a second tubular portion connected to a tip end of the first tubular portion,
The second cylindrical portion includes a plurality of reflection mirrors that reflect the laser light toward a processing target, and a gas supply path that forms a part of the gas supply unit.
A laser irradiation device characterized by the above.   The laser irradiation apparatus according to claim 1, wherein the laser irradiation head includes a shield plate that partitions the processing space and transmits the laser light. The gas supply path is formed so as to penetrate the connecting portion between the first tubular portion and the second tubular portion and the wall surface portion of the second tubular portion to communicate with the processing space. The laser irradiation device according to claim 1. The laser irradiation apparatus according to claim 1, the front Symbol discharge portion is formed on the base, it is characterized. The laser irradiation device according to claim 1, wherein the second tubular portion is provided with a shield plate that partitions the processing space at a tip thereof and that can transmit the laser light. The shielding plate is arranged at a position between the reflection mirror and the gas supply port of the gas supply path, and the gas supply path is configured to spray the inert gas onto the surface of the shielding plate. The laser irradiation device according to claim 5, wherein The laser irradiation apparatus according to claim 1, wherein the gas supply path is configured to spray the inert gas onto the surface of the reflection mirror.