JP6269216B2 - High temperature observation device - Google Patents

Description

  The present invention relates to a high-temperature part observation device used for non-contact temperature measurement.

  When measuring the temperature of high-temperature parts such as the molten metal pool and its surroundings formed during welding, or the heat-treated metal, boiler, blast furnace, etc., use a contact-type temperature probe that is a general temperature detector. May not be installed. Even if it can be installed, since the temperature probe detects the temperature at the installation point, there is a problem in that it cannot meet the demand for grasping the distribution in a wide range.

  As a means for solving such a problem, there is a non-contact optical temperature measurement method. In the optical temperature measurement method, an image is acquired using a thermography, a near-infrared camera, a visible light camera, or the like, and measurement is performed using the acquired image. The temperature distribution of the object is obtained. In this case, the temperature of the measurement object is detected by thermal radiation (radiated light) from the measurement object. The relationship between synchrotron radiation and temperature can be determined from the synchrotron radiation intensity by considering the emissivity specific to the substance according to the relational expression known as Planck's formula.

  Since the radiated light intensity changes greatly even with a slight temperature difference, high-accuracy measurement is possible. However, in the situation where the heat source is close to the object to be measured, there is a problem that the intense radiation from the heat source becomes noise and the temperature of the object to be measured cannot be measured accurately.

  For example, when the heat source is a TIG torch and the object to be measured is a melted part of the work piece, the TIG electrode is located close to the melted part (the molten pool and the periphery of the molten pool), and the temperature is high. It emits strong synchrotron radiation. For this reason, the radiated light from the TIG electrode is reflected by the melted portion, and the reflected radiated light becomes noise and the accurate temperature cannot be measured.

  One way to avoid such problems is to observe from a direction in which the emitted light from the heat source is not reflected, but the camera used is large and has mounting limitations, so it can be mounted in an appropriate position. It was not always done.

  Note that Patent Document 1 discloses that an image in which the luminance level of a necessary portion is stabilized without being affected by the luminance level of an unnecessary portion of the screen. The position of the horizon, which is the upper horizontal line, is determined, and the iris area is adjusted so that the brightness of the ground area matches the predetermined target brightness, with the ground area below the horizon and the sky area above the horizon. An exposure control device for a vehicle camera that can keep the brightness level of the ground area stable without being affected by the sky area, which is an unnecessary high brightness part, by controlling the adjustment amount or the shutter speed. It is disclosed.

JP-A-8-240833

  In view of such circumstances, the present invention provides a high-temperature part observation apparatus that minimizes the influence of radiation emitted from a heat source.

  The present invention is a high-temperature portion observation device having a camera capable of acquiring an image of an observation region adjacent to a heat source and a shutter device, wherein the shutter device covers a shutter portion that covers the heat source, and the shutter portion includes the shutter portion. A resilient member that urges the heat source in a direction to conceal the heat source; an engagement member that engages with a collar provided on the shutter portion and restrains the shutter portion at a position where the heat source is exposed; and the engagement member; An actuator for releasing the engagement of the flange portion, actuates the shutter device, and instantaneously slides the shutter portion by the urging force of the elastic member, and the heat source is covered by the shutter portion. Immediately after, the camera relates to a high-temperature part observation apparatus that acquires an image of the observation region.

  Further, the present invention relates to a high-temperature part observation apparatus in which the camera is a digital camera capable of high-speed photography, and can continuously acquire images of the observation area, and the shutter part emits radiated light from a heat source. The shielding plate includes a shielding plate, and the shielding plate is related to a high-temperature portion observation apparatus in which black processing is performed, and the shutter portion includes a shielding plate that shields radiated light from a heat source. Relates to a high-temperature part observation device which is a water-cooled copper plate.

  According to the present invention, there is provided a high-temperature portion observation device having a camera capable of acquiring an image of an observation region adjacent to a heat source and a shutter device, wherein the shutter device covers the heat source, and the shutter portion. A resilient member that urges the heat source in a direction to cover the heat source, an engagement member that engages with a flange provided on the shutter portion and restrains the shutter portion at a position where the heat source is exposed, and the engagement An actuator for releasing the engagement between the member and the flange, operates the shutter device, and instantaneously slides the shutter portion by the urging force of the elastic member, and the heat source covers the heat source. Immediately after being hidden, the camera acquires an image of the observation area, so that the influence of the radiated light from the heat source is removed by the shielding plate, and the time for hiding the heat source is instantaneous, and the radiated light Diffuse reflection The change in degrees situation can be minimized, there is exhibited an excellent effect that the temperature distribution of the observation region can be accurately measured.

It is a schematic block diagram of the high temperature part observation apparatus which concerns on the Example of this invention. 1A is a plan view of the shutter device, and FIG. 1B is a front view of the shutter device according to an embodiment of the present invention. FIG. 4 is a main part of the shutter device according to the embodiment of the present invention, in which (A) shows a side sectional view of the shutter part, and (B) is a side view showing a trigger and its peripheral part. (A) is an image showing the temperature distribution in the observation region when the shutter device according to the embodiment of the present invention is operated, and (B) is a case when the shutter device according to the embodiment of the present invention is not operated. It is an image which shows the temperature distribution of an observation area | region. It is a front view which shows the modification of the shutter part which concerns on the Example of this invention.

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

  First, referring to FIG. 1, a high-temperature part observation apparatus 1 according to an embodiment of the present invention will be described.

  This example is a case where the present invention is applied to high temperature portion observation in downward TIG welding, and the measurement object is a molten portion. In FIG. 1, 2 indicates a TIG torch, 3 indicates a workpiece to be welded to the TIG torch 2, and 4 indicates a pedestal on which the workpiece 3 is placed.

  The TIG electrode 5 protruding from the tip of the TIG torch 2 serves as a heat source, and the length of the TIG electrode 5 is, for example, 20 mm or less. By generating an arc 6 from the TIG electrode 5 and supplying a welding wire 7 which is a filler metal, the workpiece 3 and the welding wire 7 are melted, and a molten pool 8 is formed.

  A camera 9 is provided on the side of the TIG torch 2. The camera 9 is, for example, a digital camera capable of high-speed shooting, and the camera 9 can continuously shoot the molten pool 8 and the observation region 11 that is the periphery thereof. The camera 9 has a CCD or CMOS sensor as an image pickup device, and signals are individually emitted from each pixel constituting the image pickup device.

  A shutter device 12 is provided between the TIG torch 2 and the camera 9. The shutter device 12 is provided on a column 13 erected on the pedestal 4, and the shutter device 12 is movable in the vertical direction with respect to the column 13 and can be fixed at an arbitrary position. The shutter device 12 includes a shutter portion 14, a flange portion 15, a flange piece 16 that is an engaging member, and a solenoid 17 that is an actuator for releasing engagement.

  An elastic member or an urging member, for example, a tension spring 18 hangs between the shutter portion 14 and the flange portion 15, and the shutter portion 14 is moved downward by the tension spring 18, that is, the TIG. The electrode 5 is biased in a direction to cover up the electrode 5.

  The flange 15 can be engaged with the flange 16. In a state where the shutter portion 14 is positioned upward, that is, in a state where the TIG electrode 5 is exposed, the tension spring 18 is bent by the engagement of the flange piece 16 with the flange portion 15. It is restrained by.

  The flange 16 is connected to the solenoid 17, and the engagement between the flange 16 and the flange 15 is released by applying an electric current to the solenoid 17 and operating the solenoid 17. When the engagement between the flange piece 16 and the flange portion 15 is released, the shutter portion 14 is instantaneously moved downward by the urging force of the tension spring 18.

  In a state where the shutter unit 14 is moved downward, the shutter unit 14 is inserted between the camera 9 and the observation region 11, and the emitted light from the TIG electrode 5 is reflected by the observation region 11. The incident on the camera 9 is prevented.

  When the arc 6 is extinguished and welding is completed, the TIG electrode 5 emits light at a high temperature, and the observation region 11 is adjacent to the heat source.

  Here, the solenoid 17 is actuated to release the engagement between the flange portion 15 and the flange piece 16, and the shutter portion 14 is instantaneously moved downward, whereby the shutter portion 14 causes the TIG. The electrode 5 is covered and radiated light emitted from the TIG electrode 5 toward the observation region 11 can be instantaneously blocked.

  Immediately after the TIG electrode 5 is shielded by the shutter unit 14, the image of the observation region 11 is acquired by the camera 9, thereby removing the influence of the emitted light from the TIG electrode 5. Images can be acquired.

  Next, the details of the shutter device 12 will be described with reference to FIGS. In FIGS. 2 and 3, the left side with respect to the paper surface is the forward direction, and the right side with respect to the paper surface is the rear direction.

  The shutter device 12 has a fixed base 19, and the fixed base 19 is attached to the support column 13 so as to be movable in the vertical direction. A front end portion 21 of the fixed base 19 is bent at a right angle, and two guide shafts 22 and 22 are fixed to the front end portion 21. The guide shaft 22 extends in front of the front end portion 21 in parallel, and a stopper block 23 is fixed to the front end of the guide shaft 22. A spring hook 24 is erected on the side surface of the stopper block 23.

  The shutter portion 14 is movably provided on the guide shaft 22.

  The shutter portion 14 includes a shutter slider 25 slidably fitted to the guide shaft 22 through a guide hole 20 and a shielding plate 26 fixed to the shutter slider 25 and black-treated. . For example, as the black processing, if the shielding plate 26 is an aluminum material, black alumite processing is performed, and if the shielding plate 26 is an iron material, tuftride (registered trademark) processing or the like is performed.

  A spring hook 27 is erected on the side surface of the shutter slider 25, and a tension spring 18 as a resilient member is stretched between the spring hook 27 and the spring hook 24. The shutter slider 25 is urged forward by the tension spring 18.

  Two shaft support pieces 28, 28 project in parallel on the rear surface of the shutter slider 25, and an engagement pin 29 is provided across the shaft support pieces 28, 28. The shaft support pieces 28 and 28 and the engagement pin 29 constitute the flange portion 15.

  On the upper surface of the fixed base 19, a heel support 31 is erected at a position facing the front end portion 21, and the heel piece 16 is rotatably provided on the heel support 31 via a pin 32.

  On the upper surface of the fixed base 19, the solenoid 17 is provided at the rear part. The solenoid 17 has a plunger 33 that moves back and forth in the front-rear direction. The solenoid 17 is connected to a drive power source (not shown) via a conductive wire 34. When the solenoid 17 is applied to the solenoid 17 via the conductive wire 34, the solenoid 17 is operated and the plunger 33 is retracted.

  The front end portion of the plunger 33 and one end portion of the plate-like connecting member 35 are rotatably connected via a connecting pin 36, and the other end portion of the connecting member 35 is connected via the connecting pin 37. It is rotatably attached to the rear end portion. The flange 16 is engageable with the engagement pin 29, and the plunger 33 is retracted and the connecting member 35 is pulled rearward, so that the flange 16 is in FIG. 2 (A). Rotating counterclockwise, the engagement with the engagement pin 29 is released.

  Further, a resilient member, for example, one end of a tension spring 38 is attached to the connecting pin 37, and the other end of the tension spring 38 is attached to the fixed base 19. The tension spring 38 urges the plunger 33 in the direction opposite to the retracting direction of the plunger 33, that is, the direction in which the flange 16 is engaged with the engagement pin 29. When engaged with 29, the engaged state is maintained.

  Next, the operation of the high-temperature part observation apparatus 1 according to the embodiment of the present invention will be described.

  First, the workpiece 3 is welded by the TIG torch 2. The arc 6 is generated from the TIG electrode 5 protruding from the tip of the TIG torch 2 and the welding wire 7 which is a filler metal is supplied. The arc 6 melts the workpiece 3 and the welding wire 7 to form the molten pool 8. At this time, the TIG electrode 5 emits light at a high temperature, and the observation region 11 is adjacent to the heat source.

  When the image of the observation region 11 is acquired, the solenoid 17 is operated at the same time or immediately before the arc 6 is extinguished, for example, from 0 second to 0.1 second before the arc 16 and the engagement pin 16 29 is released.

  When the engagement between the flange piece 16 and the engagement pin 29 is released, the shutter slider 25 is moved at a predetermined speed, for example, at a speed of 200 mm / sec or more finally by the urging force of the tension spring 18. Sliding along the guide shaft 22, the shielding plate 26 instantly covers the TIG electrode 5.

  Further, immediately after the arc 6 is extinguished, for example, 0.03 to 0.06 seconds later, the shutter of the camera 9 is operated at a predetermined shutter speed, for example, 0.01 seconds, and the camera 9 performs the observation region. Eleven images are acquired.

  At this time, by covering the TIG electrode 5 with the shielding plate 26 instantaneously, it is possible to remove the influence of the radiated light from the TIG electrode 5 within 0.1 seconds after the arc 6 is extinguished. By operating the camera 9 at the timing, it is possible to obtain an image in which the influence of the radiated light from the TIG electrode 5 is removed and the influence of shielding the TIG electrode 5 is minimized.

  The timing at which the arc 6 is extinguished, the timing at which the solenoid 17 is operated, the timing at which the shutter of the camera 9 is operated, and the like are based on various conditions such as the biasing force of the tension spring 18 and the TIG electrode 5. Is appropriately set so that an image of the observation region 11 immediately after being covered with the shielding plate 26 can be acquired.

  4A shows an image acquired in a state where the shutter device 12 is operated and the TIG electrode 5 is obscured by the shielding plate 26, and FIG. 4B shows that the shutter device 12 is not operated. The image acquired in the state which did not cover the said TIG electrode 5 is shown. 4A and 4B, the bright portion that appears in a half-moon shape is the molten pool 8, and the black portion indicates the workpiece 3 to be welded. In the molten pool 8 portion, the difference in brightness represents a temperature difference.

  As shown in FIG. 4A, when the TIG electrode 5 is covered with the shielding plate 26, the influence of the radiated light from the TIG electrode 5 that emits light at a high temperature is removed by the shielding plate 26, An image displaying a clear temperature distribution can be acquired. On the other hand, as shown in FIG. 4B, when the TIG electrode 5 is not covered by the shielding plate 26, the radiated light from the TIG electrode 5 enters the camera 9, or the observation When the reflected light is reflected by the region 11 and is incident on the camera 9, an image on which an unclear temperature distribution with noise 39 is displayed is acquired.

  As described above, in this embodiment, by operating the shutter device 12 immediately before the arc 6 is extinguished, the TIG electrode 5 that emits light at a high temperature immediately after welding is instantaneously applied by the shielding plate 26. The camera 9 acquires an image of the observation region 11 including the molten pool 8 and its peripheral portion immediately after the shielding plate 26 shields the TIG electrode 5.

  Therefore, the shielding plate 26 removes the radiation light from the TIG electrode 5 and the influence of the reflection of the radiation light, and the time for covering the TIG electrode 5 is extremely short, so that the TIG electrode 5 is shielded. The shield plate 26 is heated, and an image in which the diffuse reflection of the secondary radiation from the shield plate 26 and the change in the temperature state are minimized can be acquired, and the observation region 11 immediately after the welding is obtained. It is possible to accurately measure the temperature distribution.

  Further, by using a high-speed camera as the camera 9 and continuously acquiring images of the observation region 11 and measuring the temperature distribution, the temperature change state of the observation region 11 can be measured. By measuring the temperature change state of the observation region 11, for example, the correlation between the occurrence of hot cracking after welding and the temperature distribution can be obtained.

  Further, since the black alumite treatment is applied to the shielding plate 26, the secondary reflection of the radiated light by the shielding plate 26 can be suppressed, and the temperature distribution in the observation region 11 can be measured more accurately. Can do.

  In the present embodiment, the shielding plate 26 subjected to the black alumite treatment is used, but a water-cooled copper plate 41 may be used as the shielding plate 26 as in the modification shown in FIG. The water-cooled copper plate 41 has a structure in which a water-cooled pipe 43 is provided on the surface of the copper plate 42, and the copper plate 42 is cooled by flowing water through the water-cooled pipe 43.

  By using the water-cooled copper plate 41, the shielding effect of the TIG electrode 5 can be enhanced, and an accurate temperature distribution in the observation region 11 can be measured without extinguishing the arc 6. In this case, the shutter device 12 is operated immediately before the image of the observation area 11 is acquired, and the image of the observation area 11 is acquired immediately after the TIG electrode 5 is covered with the shielding plate 26. By doing so, the time when the TIG electrode 5 is covered by the shielding plate 26 becomes instantaneous, and the influence of shielding can be minimized.

  Moreover, the said high temperature part observation apparatus 1 of a present Example is applicable not only to the temperature distribution measurement of the said observation area | region 11 at the time of welding, but also to the temperature distribution measurement in a high temperature furnace, for example. Even when the temperature distribution in the furnace is measured, the shielding effect can be enhanced and the accurate temperature distribution can be measured by forming the shielding plate 26 with a water cooling structure. In this embodiment, the temperature distribution measurement in the case of performing downward TIG welding is described, but the high-temperature portion observation apparatus 1 of this embodiment can be applied even in the case of performing upward welding or lateral welding. It is. Furthermore, even when the welding object 3 is welded using only the arc 6 without using the welding wire 7 which is a filler metal, the high temperature part observation device 1 of the present embodiment is applicable.

  Needless to say, the shielding plate 26 is not limited to black, but may be any other color as long as secondary reflection of radiated light can be suppressed.

DESCRIPTION OF SYMBOLS 1 High temperature part observation apparatus 2 TIG torch 3 To-be-welded object 5 TIG electrode 6 Arc 8 Molten pool 9 Camera 11 Observation area | region 12 Shutter apparatus 14 Shutter part 15 ridge part 16 heel piece (engaging member)
17 Solenoid (actuator) 18 Tension spring (elastic member)
26 Shielding plate 41 Water-cooled copper plate

Claims (4)

  A high-temperature portion observation device having a camera capable of acquiring an image of an observation region adjacent to a heat source and a shutter device, wherein the shutter device covers the heat source, and the shutter portion covers the heat source. A resilient member that urges in a direction, an engagement member that engages with a flange provided on the shutter portion and restrains the shutter portion at a position where the heat source is exposed, and the engagement member and the flange An actuator for releasing the engagement, actuates the shutter device, instantaneously slides the shutter portion by the urging force of the elastic member, and immediately after the heat source is obscured by the shutter portion, A high-temperature part observation apparatus, wherein a camera acquires an image of the observation region.   The high-temperature part observation apparatus according to claim 1, wherein the camera is a digital camera capable of high-speed shooting, and images of the observation area can be continuously acquired.   The high-temperature part observation apparatus according to claim 1, wherein the shutter unit includes a shielding plate that shields radiation emitted from a heat source, and the shielding plate is subjected to black processing.   3. The high-temperature part observation apparatus according to claim 1, wherein the shutter unit includes a shielding plate that shields radiated light from a heat source, and the shielding plate is a water-cooled copper plate.