JP2016015677A - Image pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image pickup device which enables imaging at a position close to an arc or a weld pool and which can protect an optical system from a scattering material such as a spatter.SOLUTION: An image pickup device comprises: a camera body 2 for imaging a welding area 27 of a measuring object 17 ; a light guide part 4 connected to the camera body, for guiding an optical axis 16 of the camera body to the welding area; and a lens protection part 10 provided opposite to a tip of the light guide part. The lens protection part includes a protection plate 24 which covers a whole are of the tip of the light guide part and has a through hole 26 on the optical axis; and an air nozzle for blowing out shield air 28 to between te tip of the light guide part and the protection plate, in which the shield air is blown along a surface of the protection plate.

Description

  The present invention relates to an imaging device for imaging or observing the state of an arc during welding and the state of a molten pool.

  When observing the arc and weld pool during welding and taking an image, it is necessary to provide a protection mechanism for preventing spatter and the like scattered from the weld pool from adhering to the lens.

  However, when the protection mechanism described above is provided, the apparatus becomes large and the installation position of the camera is limited. In particular, when observing a narrow spot in welding, it is difficult to place a camera near the molten pool.

  In order to monitor the welding state and appropriately control the welding, it is desirable to take an image at a position as close to the arc and the molten pool as possible.

  In Patent Document 1, an interference filter provided in front of the camera, a protective glass, an optical path hole drilled in front of the protective glass, and the front of the optical path hole are covered and interfered with the optical path hole. A half hood provided so as not to, and an air introduction pipe that introduces air so as to flow across the optical path hole by the half hood between the protective glass and the optical path hole, A welding visual sensor and a welding control method for preventing intrusion of spatter and fume from an optical path hole are disclosed.

JP-A-7-299565

  In view of such circumstances, the present invention provides an image pickup apparatus that can take an image at a position close to an arc and a molten pool and can protect an optical system from scattered matter such as spatter.

  The present invention is provided with a camera that captures an image of a welding portion of a measurement object, a light guide portion that is connected to the camera and guides the optical axis of the camera to the welding portion, and is opposed to the tip of the light guide portion. A lens protection part, the lens protection part covering the entire surface of the tip of the light guide part and having a through hole on the optical axis, and between the tip of the light guide part and the protection plate An air nozzle that ejects air, and the air relates to an imaging device that is ejected along the surface of the protection plate.

  Further, the present invention relates to an imaging apparatus in which the protective plate is inclined downward and away from the welded portion.

  In the present invention, a diaphragm member is provided at the tip of the light guide section, the diaphragm member is positioned on the optical axis, is concentric with the through hole, and has a diaphragm hole having a smaller diameter than the through hole. This relates to an imaging apparatus.

  Furthermore, the present invention relates to an imaging apparatus that further includes an auxiliary air supply port that supplies auxiliary air to the inside of the light guide unit and makes the inside positive.

  According to the present invention, a camera that captures an image of a welding portion of a measurement object, a light guide portion that is connected to the camera and guides the optical axis of the camera to the welding portion, and is opposed to the tip of the light guide portion A lens protection part provided, the lens protection part covering the entire surface of the light guide part tip and having a through hole on the optical axis, and a tip of the light guide part and the protection plate. An air nozzle that ejects air in between, and since the air is ejected along the surface of the protective plate, it can be disposed in the vicinity of the welded portion, and it is possible to image a narrow part, Most of the spatter scattered from the welded portion is shielded by the protective plate, and an excellent effect is exhibited that the spatter can be prevented from adhering to the optical member.

It is a schematic front view which shows the case where the imaging device which concerns on 1st Example of this invention is applied to observation of a welding part. It is a principal part enlarged view of the imaging device which concerns on 1st Example of this invention. It is a principal part enlarged view of the imaging device which concerns on 2nd Example of this invention. It is a schematic side view which shows the imaging device which concerns on the 3rd Example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, referring to FIG. 1 and FIG. 2, an outline of an image pickup apparatus according to an embodiment of the present invention will be described.

  The imaging device 1 mainly includes a camera body 2, a light guide unit 4, and a lens protection unit 10. The camera body 2 includes an image sensor 3 and an imaging optical system 3a. The image sensor 3 includes a CCD, a CMOS center, etc., and outputs digital image data.

  The light guide 4 having an optical path bent therein is attached to the camera body 2. For example, the light guide 4 is connected to the base barrel 5, the intermediate barrel 6 connected to the base barrel 5 at a right angle, and the intermediate barrel 6 at a predetermined angle. The small lens barrel portion 7 has a three-part structure. The proximal end barrel portion 5, the intermediate barrel portion 6 and the small barrel portion 7 have, for example, threaded portions formed on a proximal end side outer peripheral surface and a distal end side inner peripheral surface. A proximal barrel portion 5 is attached via a screw portion, and the intermediate barrel portion 6 is attached to a distal end portion of the proximal barrel portion 5 via a screw portion, and a distal end portion of the intermediate barrel portion 6 The small lens barrel portion 7 is attached through a screw portion.

  A first reflecting mirror 22 as a deflecting optical member is provided at the distal end portion of the base end barrel portion 5, and the optical axis 16 is deflected vertically downward by the first reflecting mirror 22. The intermediate barrel portion 6 is provided with a lens unit 9 as a relay optical member. The lens unit 9 can be displaced in the direction of the optical axis 16 and has a focus adjustment function.

  The small lens barrel portion 7 is provided with a second reflecting mirror 23 and an aspherical lens 13 as deflection optical members, and a diaphragm member 14 is attached to the tip of the small lens barrel portion 7. A narrow hole 15 having a small diameter, for example, 1 mm or less is formed in 14. The second reflecting mirror 23 deflects the optical axis 16 toward the welding position. The aspherical lens 13 is configured to propagate incident light from the aperture 15 in parallel without spherical aberration, and the lens unit 9 has a large F number, and even a single lens can be made free of aberrations. .

  The image pickup device 3, the lens unit 9, the aspherical lens 13, and the aperture hole 15 are located on the optical axis 16 of the camera body 2.

  A protective plate attachment 25 is provided at the lower end of the intermediate lens barrel 6, and the protective plate 24 is attached to the protective plate attachment 25. The guard plate 24 is parallel to the throttle member 14 and a required gap is formed between the guard plate 24 and the throttle member 14. The protective plate 24 is formed with a through hole 26 concentric with the throttle hole 15. The through hole 26 is larger than the throttle hole 15, and the throttle hole 15 and the through hole 26 are required for photographing. Is set so as to satisfy the angle of view α.

  The protective plate fixture 25 is provided with an air nozzle 29 a for ejecting shield air 28, the tip of the air nozzle 29 a is close to the throttle hole 15, and the axis of the air nozzle 29 a is orthogonal to the optical axis 16. It is supposed to do. An air supply pipe 29 provided along the intermediate barrel portion 6 is connected to the air nozzle 29a, and the air supply pipe 29 is connected to an air supply source (not shown).

  In FIG. 2, reference numeral 18 denotes a groove on which the measurement objects 17, 17 are abutted. In FIG. 2, reference numeral 19 denotes a welding torch. When the filler metal 21 is supplied from the welding torch 19 to the groove 18 and melted, the measurement objects 17 and 17 are welded. It has become.

  The light beam emitted from the measurement object 17 passes through the aperture 15, is collimated by the aspheric lens 13, is deflected by the lens unit 9, and is projected onto the image sensor 3. A measurement object image is formed on the element 3. The aperture protection member 14, the protection plate 24, the air nozzle 29a and the like constitute the lens protection unit 10.

  The protective plate 24 covers the entire lower end of the small lens barrel 7, is orthogonal to the optical axis 16, and the through hole 26 is located on the optical axis 16.

  The air nozzle 29a jets the shield air 28 between the lower end of the small barrel portion 7 and the protection plate 24 along the surface of the protection plate 24, and the shield air 28 is The front of the throttle hole 15 is crossed.

  A cooling flow path 31 is formed in the intermediate lens barrel portion 6 and the small lens barrel portion 7, and cooling water flows through the cooling flow channel 31, and the lens unit 9, the aspherical lens 13, The optical system such as the first reflecting mirror 22 and the second reflecting mirror 23 can be water-cooled via the proximal end barrel portion 5, the intermediate barrel portion 6, and the small barrel portion 7.

  Further, the small lens barrel portion 7 is provided with a substantially L-shaped collision prevention cover 32 that covers the side surface of the small lens barrel portion 7 from the side surface to the lower surface with a predetermined gap therebetween, and the imaging device 1 is excessively disposed. When moved, the small lens barrel 7 does not come into direct contact with the measurement object 17 or the like.

  A light beam (thermal radiation) from the welded portion 27 passes through the through hole 26 and the aperture 15, is converted into a parallel light beam by the aspheric lens 13, and is deflected to the second reflecting mirror 23. Further, the parallel light flux is converged by the lens unit 9, deflected to the first reflecting mirror 22, projected onto the image sensor 3, and an image of the welded portion 27 is formed on the image sensor 3. Thus, an image of the welded portion 27 is acquired.

  Since the lens unit 9 is slidable in the axial direction in the intermediate lens barrel 6, the image formation position of the image of the welded portion 27 can be obtained by sliding the lens unit 9. Can be adjusted.

  At this time, the intermediate lens barrel portion 6 is vertical like the welding torch 19, and the optical axis 16 deflected vertically downward by the first reflecting mirror 22 is deflected toward the welding portion 27. Therefore, since the imaging device 1 is provided on the optical axis 16 deflected in a direction away from the welding torch 19, the light guide portion 4 can be disposed close to the welding torch 19. A narrow image of the inside of the groove 18 can be acquired.

  In addition, since the entire lower end of the small lens barrel portion 7 is covered with the protective plate 24, the front surface of the aspherical lens 13 is further covered with the diaphragm member 14. Most of the spatter is blocked by the protective plate 24, and only a small amount of spatter passes through the through hole 26. Therefore, it is possible to prevent spatter from adhering to the aspheric lens 13 inside the small lens barrel portion 7.

  The air nozzle 29a is provided between the lower end of the small barrel portion 7 and the protective plate 24, and the shield air is provided between the lower end of the small barrel portion 7 and the protective plate 24 from the air nozzle 29a. 28 is ejected. Since the shield air 28 flows in one direction through a narrow and flat space formed between the lower end surface of the small lens barrel portion 7 and the protective plate 24, the shield air 28 is scattered from the welded portion 27, and the through holes The spatter that has passed through 26 is effectively blown off by the shield air 28, and it is possible to prevent the spatter from adhering to the aspherical lens 13 inside the small lens barrel portion 7.

  The protective plate 24 is inclined downward, for example, in a direction away from the welded portion 27, covers the entire lower end of the small lens barrel portion 7, and the shield air 28 extends along the surface of the protective plate 24. Therefore, the shield air 28 blown out from the space between the lower end surface of the small barrel portion 7 and the protection plate 24 flows in a direction away from the welded portion 27. For this reason, the shield air 28 does not affect the welded portion 27. Further, it is possible to increase the ejection amount of the shield air 28, and the effect of preventing spatter adhesion to the aspherical lens 13 inside the small lens barrel portion 7 can be further enhanced.

  Furthermore, since the aspherical lens 13 can be brought close to the welded portion 27, the angle of view of the aspherical lens 13 can be small, and the diameter of the aperture 15 can be 1 mm or less, for example. Further, since the shield air 28 only needs to prevent the intrusion of spatter into the throttle hole 15, the flow path diameter of the shield air 28 can be reduced, and the flow rate of the shield air 28 can be reduced.

  A wavelength filter for limiting the transmission wavelength may be provided in the optical path of the optical axis 16. By providing the wavelength filter, it is not necessary to consider chromatic aberration, and the optical system of the imaging apparatus 1 can be simplified.

  Further, illumination light irradiation means may be provided separately, and illumination light may be irradiated onto the optical axis 16. By irradiating the illumination light, a clear image can be obtained even when the amount of light from the welded portion 27 is insufficient during imaging.

  Further, a protective glass may be provided between the aspheric lens 13 and the diaphragm member 14 in order to prevent spatter from adhering to the aspheric lens 13.

  Next, a second embodiment of the present invention will be described with reference to FIG. In FIG. 3, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  In the second embodiment, an auxiliary air supply port 33 is provided in the intermediate barrel portion 6, and the auxiliary air supply port 33 is connected to an auxiliary air supply source (not shown). Auxiliary air 34 is supplied from the auxiliary air supply port 33 into the intermediate barrel 6 and the inside is maintained at a positive pressure. The auxiliary air 34 circulates in the intermediate lens barrel 6 and is discharged to the outside through the aperture 15.

  At the time of welding, it is possible to block the spatter scattered from the welded portion 27 by ejecting the shield air 28 from the air nozzle 29a and to prevent the spatter from adhering to the aspherical lens 13. There is a possibility that a negative pressure is generated between the lower end of the small barrel portion 7 and the protective plate 24, and the fumes generated from the welded portion 27 may flow between the lower end of the small barrel portion 7 and the protective plate 24. is there.

  In the second embodiment, the auxiliary air 34 is supplied from the auxiliary air supply port 33 to the inside of the intermediate lens barrel portion 6 and is discharged from the aperture 15. 6 has a positive pressure and prevents the fume flowing between the lower end of the small barrel portion 7 and the protective plate 24 from entering through the aperture 15 and adhering to the aspherical lens 13. be able to.

  In the first embodiment and the second embodiment, the case where the image pickup device 1 picks up an image of the welded portion 27 of the narrow groove 18 has been described. Needless to say, the present invention can also be applied to an environment where dirt is likely to adhere to the aspherical lens 13 at high temperatures.

  In the first embodiment and the second embodiment described above, the optical axis in which the light guide 4 is bent is formed, but in the third embodiment shown in FIG. 4, a linear optical axis 16 is formed. . 4 that are the same as those in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.

  As described above, the light guide unit 4 can appropriately change the optical axis 16 in accordance with the installation conditions of the imaging device 1, and an environment in which spatter and dust easily adhere to the lens in a high-temperature narrow part. Etc., and can be applied according to the application.

DESCRIPTION OF SYMBOLS 1 Imaging device 2 Camera main body 4 Light guide part 5 Base end lens barrel part 6 Intermediate lens barrel part 7 Small lens barrel part 9 Lens unit 13 Aspherical lens 15 Aperture hole 16 Optical axis 22 First reflector 23 Second reflector 24 Protective plate 26 Through-hole 27 Welded portion 28 Shield air 29 Air supply pipe 33 Auxiliary air supply port 34 Auxiliary air

Claims (4)

  A camera that captures an image of a welding portion of a measurement object, a light guide portion that is connected to the camera and guides the optical axis of the camera to the welding portion, and a lens protection portion that is provided to face the tip of the light guide portion The lens protection unit covers the entire front end of the light guide unit and has a protective plate having a through hole on the optical axis, and jets air between the front end of the light guide unit and the protection plate. An imaging apparatus comprising: an air nozzle, wherein the air is ejected along a surface of the protection plate.   The imaging device according to claim 1, wherein the protection plate is inclined downward in a direction away from the welded portion.   A diaphragm member is provided at a tip of the light guide portion, and the diaphragm member is located on the optical axis, is concentric with the through hole, and has a diaphragm hole having a smaller diameter than the through hole. Item 2. The imaging device according to Item 2.   The imaging device according to any one of claims 1 to 3, further comprising an auxiliary air supply port that supplies auxiliary air to the inside of the light guide unit to make the inside positive pressure.

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