JP6536279B2 - High temperature observation device - Google Patents

Description

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

  Contact point temperature probe which is a general temperature detector when measuring the temperature of a molten metal pool formed at the time of welding and its surrounding area, etc., or a metal during heat treatment, a high temperature part such as a boiler, inside a blast furnace It may not be possible to install it. Alternatively, although the temperature probe can be installed, the temperature probe detects the temperature at the installation point, so that there is a problem that it can not meet the demand for grasping the distribution over a wide area.

  As a means to solve such problems, there is a non-contact type 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 (radiation light) from the measurement object. The relationship between radiation and temperature follows the relationship known as Planck's equation, and the temperature can be determined from the radiation intensity by further considering the emissivity specific to the substance.

  The emitted light intensity largely changes even with a slight difference in temperature, so that highly accurate measurement is possible. However, in a situation where the heat source is close to the object to be measured, the strong radiation from the heat source becomes noise and there is a problem that the temperature of the object to be measured can not be accurately measured.

  For example, when the heat source is a TIG torch and the object to be measured is the fusion zone of the object to be welded, the TIG electrode is at a position close to the fusion zone (fusion pool and periphery of the fusion pool) It emits strong radiation. For this reason, the radiation from the TIG electrode is reflected at the melting portion, and the reflected radiation becomes noise, which makes it impossible to measure an accurate temperature.

  As a method to avoid such a problem, it is conceivable to observe from a direction in which the light emitted from the heat source is not reflected, but the camera used is large, has mounting limitations, and can be installed in an appropriate position. It was not always possible.

  Patent Document 1 discloses that the luminance level of the necessary part is stabilized without being affected by the luminance level of the unnecessary part of the screen and an image is acquired. Patent Document 1 discloses a screen from a screen taken by a camera The position of the horizon, which is the upper horizontal line, is determined. The lower side of the horizon is the ground area, and the upper side of the horizon is the empty area. The iris diaphragm is adjusted so that the luminance of the ground area matches the predetermined target luminance. An exposure control device for a vehicle camera capable of keeping the brightness level of the ground area stable without being influenced 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

  The present invention provides a high temperature observation device that minimizes the influence of radiation emitted from a heat source.

  The present invention is a high temperature part observation device having a camera capable of acquiring an image of an observation region adjacent to a heat source forming a molten pool on a measurement object, and a shutter device, wherein the shutter device covers the heat source Engaging with a shutter portion, a resilient member urging the shutter portion in a direction to cover the heat source, and a hook portion provided on the shutter portion to engage the shutter portion at a position where the heat source is exposed Joint member, and an actuator for releasing the engagement between the engaging member and the hook portion, and the shutter portion is a shield plate for shielding radiation light from the heat source, and is displaceable with respect to the shield plate And an auxiliary shutter portion having a movable auxiliary shielding plate, the shutter device is operated, the shutter portion is instantly slid by the biasing force of the resilient member, and the heat source is covered by the shielding plate. , Of the measurement object The high temperature observation apparatus according to the present invention relates to a high temperature observation apparatus in which the camera acquires an image of the observation area immediately after the gap between the shielding plate and the object to be measured is covered by the movable auxiliary shielding plate displaced along the surface. .

  Further, according to the present invention, the auxiliary shutter portion is provided rotatably at an auxiliary shielding plate provided at a central portion of the shielding plate and extends toward the auxiliary shielding plate from an end side of the shielding plate. The high temperature part observation apparatus according to the present invention comprises: a movable auxiliary shielding plate; and an auxiliary resilient member urging the auxiliary shielding plate and the movable auxiliary shielding plate in a direction to cover the heat source.

  Further, according to the present invention, the auxiliary shielding plate is a state in which the movable auxiliary shielding plate protrudes in a direction to cover the heat source more than the auxiliary shielding plate and the movable auxiliary shielding plate abuts on the surface of the object to be measured. The present invention relates to the high temperature part observation device which is separated from the object to be measured.

  Further, according to the present invention, the auxiliary shutter portion has a plurality of auxiliary shielding plates provided so as to be independently displaced, and an auxiliary resilient member for biasing the auxiliary shielding plate in a direction to cover the heat source. The auxiliary shielding plate relates to a high temperature part observation device which protrudes in a direction in which the heat source is covered and hidden more than the shielding plate.

  Furthermore, the present invention relates to the high temperature part observation apparatus in which the auxiliary shielding plate is rotatably provided.

  According to the present invention, there is provided a high temperature observation apparatus having a camera capable of acquiring an image of an observation area adjacent to a heat source forming a molten pool on a measurement object, and a shutter device, wherein the shutter device comprises the heat source. Engage with the shutter part to conceal, the elastic member urging the shutter part in the direction to cover the heat source, and the hook part provided on the shutter part, and restrain the shutter part at the position where the heat source is exposed Engaging member, and an actuator for releasing the engagement between the engaging member and the flange portion, the shutter portion being a shielding plate for shielding radiation light from the heat source, and displacement with respect to the shielding plate And an auxiliary shutter portion having a movable auxiliary shield plate, the shutter device is operated, the shutter portion is slid instantaneously by the biasing force of the resilient member, and the heat source is covered by the shield plate. Hidden, the measurement pair Since the camera acquires an image of the observation area immediately after the gap between the shielding plate and the measurement object is covered by the movable auxiliary shielding plate displaced according to the surface of the object, the shielding plate and the movable auxiliary The shielding plate removes the influence of the radiation from the heat source, and the time to cover and hide the heat source is instantaneous, and it is possible to minimize the irregular reflection of the radiation and the change of the temperature condition, It exerts an excellent effect that the temperature distribution in the region can be measured accurately.

It is a schematic block diagram of the high temperature part observation apparatus based on the 1st Example of this invention. It is a shutter apparatus based on the 1st Example of this invention, (A) shows the top view of this shutter apparatus, (B) has shown the front view of this shutter apparatus. It is a principal part of the shutter apparatus based on the 1st Example of this invention, (A) shows the sectional side view of a shutter part, (B) is a side view which shows a trigger and its peripheral part. (A) is an image showing the temperature distribution of the observation area when the shutter device according to the first embodiment of the present invention is operated, and (B) shows the shutter device according to the first embodiment of the present invention It is an image which shows temperature distribution of the observation area | region when not making it operate | move. FIG. 7 is a side sectional view showing a modified example of the shutter unit according to the first embodiment of the present invention. It is a top view of the shutter part concerning a 2nd example of the present invention, (A) shows the state before shutter device operation, and (B) shows the state after shutter device operation. It is a top view of the shutter part which concerns on the 3rd Example of this invention, (A) shows the state before shutter device operation | movement, (B) has shown the state after shutter device operation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

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

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

  The TIG electrode 5 protruding from the tip of the TIG torch 2 is 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 to form a molten pool 8.

  A camera 9 as an imaging device 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 enables continuous shooting of the molten pool 8 and the observation area 11 which is the periphery thereof. Further, the camera 9 has a CCD or CMOS sensor as an image pickup element, and signals are individually emitted from respective pixels constituting the image pickup element.

  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 has a shutter portion 14, a collar portion 15, a collar piece 16 which is an engaging member, and a solenoid 17 which is an actuator for releasing the engagement.

  For example, a compression spring 18 is stretched as a resilient member or biasing member between the shutter portion 14 and the collar portion 15, and the shutter portion 14 is moved downward by the compression spring 18, that is, The TIG electrode 5 is biased in a direction to close it.

  The hook 15 is engageable with the hook 16. The compression spring 18 is in a bent state by the hook piece 16 engaging with the hook portion 15 in a state in which the shutter portion 14 is positioned upward, that is, in a position where the TIG electrode 5 is exposed. Restrained by

  Further, the scissor piece 16 is connected to the solenoid 17, and by applying a current to the solenoid 17 to operate the scissor piece 17, the engagement between the scissor piece 16 and the scissor portion 15 is released. When the engagement between the hook piece 16 and the hook portion 15 is released, the shutter portion 14 is momentarily moved downward by the biasing force of the compression spring 18.

  In a state in which the shutter unit 14 is moved downward, the shutter unit 14 is inserted between the camera 9 and the observation area 11, and light emitted from the TIG electrode 5 is reflected by the observation area 11, and The light is prevented from entering the camera 9.

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

  Here, the TIG is operated by the shutter portion 14 by operating the solenoid 17 to release the engagement between the hook portion 15 and the hook piece 16 and instantaneously moving the shutter portion 14 downward. The electrode 5 is covered, and radiation emitted from the TIG electrode 5 toward the observation area 11 can be interrupted instantaneously.

  Immediately after the TIG electrode 5 is shielded by the shutter unit 14, an image of the observation region 11 is acquired by the camera 9 to remove the influence of the light emitted from the TIG electrode 5. You can get an image of

  Next, the details of the shutter device 12 will be described with reference to FIGS. 2 (A), 2 (B), 3 (A) and 3 (B). In FIGS. 2A, 2B, 3A, and 3B, the left side with respect to the sheet is the front direction, and the right side with respect to the sheet is the rear direction.

  The shutter device 12 has a fixed pedestal 19, and the fixed pedestal 19 is attached to the support column 13 so as to be vertically movable. The front end 21 of the fixed base 19 is bent at a right angle, and two guide shafts 22, 22 are fixed to the front end 21. The guide shafts 22 extend parallel to the front of the front end 21 and a stopper block 23 is fixed to the front ends of the guide shafts 22. A spring hook 24 is provided upright on the side surface of the stopper block 23.

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

  The shutter portion 14 has a shutter slider 25 slidably fitted to the guide shafts 22 and 22 through a guide hole 20, and a shielding plate 26 fixed to the shutter slider 25 and blackened. ing. For example, as the black processing, black alumite processing is performed if the shielding plate 26 is an aluminum material, and Tuftride (registered trademark) processing etc. is performed if the shielding plate 26 is an iron material.

  A spring hook 27 is provided upright on the side surface of the shutter slider 25, and the compression spring 18 as a resilient member is hooked between the spring hook 27 and the spring hook 24. The shutter slider 25 is biased forward by the compression spring 18.

  On the rear surface of the shutter slider 25, two shaft support pieces 28, 28 project in parallel, and an engagement pin 29 is provided over the shaft support pieces 28, 28. The collar portion 15 is constituted by the shaft support pieces 28 and the engagement pin 29.

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

  The solenoid 17 is provided at the rear of the upper surface of the fixed pedestal 19. The solenoid 17 has a plunger 33 which advances and retracts in the front-rear direction. The solenoid 17 is connected to a drive power source (not shown) via a lead 34, and application of the solenoid 17 via the lead 34 activates the solenoid 17 to retract the plunger 33.

  The front end of the plunger 33 and one end of the plate-like connecting member 35 are rotatably connected via the connecting pin 36, and the other end of the connecting member 35 is connected to the hooking piece 16 via the connecting pin 37. Is rotatably attached to the rear end of the. The hook piece 16 is engageable with the engagement pin 29, and the plunger 33 retracts and the connection member 35 is pulled rearward, so that the hook piece 16 is in FIG. 2B. , And rotates in the counterclockwise direction so that the engagement with the engagement pin 29 is released.

  Further, one end of a resilient member, for example, a tension spring 38 is attached to the connection pin 37, and the other end of the tension spring 38 is attached to the fixing pedestal 19. The tension spring 38 urges the hook piece 16 in a direction opposite to the retraction direction of the plunger 33, that is, in a direction in which the hook piece 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 device 1 according to the embodiment of the present invention will be described.

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

  When acquiring the image of the observation area 11, the solenoid 17 is operated simultaneously with or immediately before the arc 6 is extinguished, for example, 0 seconds to 0.1 seconds, and the scissor piece 16 and the engagement pin Release the engagement with 29.

  When the engagement between the hook piece 16 and the engagement pin 29 is released, the shutter slider 25 is moved at a speed which reaches a predetermined speed, for example, 200 mm / sec or more by the biasing force of the compression spring 18. Sliding along the guide shafts 22, 22, the shield plate 26 hides the TIG electrode 5 instantaneously.

  Further, immediately after the arc 6 is extinguished, for example, 0.03 seconds to 0.06 seconds, the shutter of the camera 9 is operated at a predetermined shutter speed, for example, 0.01 seconds, and the observation area is observed by the camera 9 Get 11 images.

  At this time, by covering the TIG electrode 5 instantaneously with the shielding plate 26, the influence of the emitted light from the TIG electrode 5 can be removed within 0.1 seconds after the arc 6 is extinguished, as described above. By operating the shutter of the camera 9 at timing, the influence of the light emitted from the TIG electrode 5 is removed, and an image with the influence of shielding the TIG electrode 5 minimized is obtained. it can.

  The timing to extinguish the arc 6, the timing to operate the solenoid 17, the timing to operate the shutter of the camera 9, etc. are determined based on various conditions such as the biasing force of the compression spring 18 and the like. Are set appropriately so that an image of the observation area 11 immediately after the cover plate 26 is covered and concealed can be acquired.

  FIG. 4A shows an image of the observation area 11 obtained in a state in which the shutter device 12 is operated and the TIG electrode 5 is covered and concealed by the shield plate 26. FIG. 4B shows the shutter device The image of the said observation area | region 11 acquired in the state which did not operate | move 12 and did not cover the said TIG electrode 5 is shown. In FIGS. 4 (A) and 4 (B), the bright part that looks like a half moon is the molten pool 8, and the black part shows the object 3 to be welded. Also, in the molten pool 8 part, the difference in lightness represents a temperature difference.

  As shown in FIG. 4A, when the TIG electrode 5 is covered with the shielding plate 26, the shielding plate 26 eliminates the influence of the emitted light from the TIG electrode 5 which emits light at high temperature, It is possible to acquire an image in which a clear temperature distribution is displayed. On the other hand, as shown in FIG. 4B, when the TIG electrode 5 is not covered by the shielding plate 26, radiation light from the TIG electrode 5 enters the camera 9, or the observation The reflected light is reflected by the area 11 and the reflected light is incident on the camera 9, whereby an image is displayed in which the unclear temperature distribution in which the noise 39 is generated is displayed.

  As described above, in the present embodiment, the TIG electrode 5 emitting light at a high temperature immediately after welding is activated by the shielding plate 26 by operating the shutter device 12 at the same time or immediately before the arc 6 is extinguished. Immediately after the shielding plate 26 shields the TIG electrode 5, an image of the observation area 11 including the molten pool 8 and its peripheral portion is acquired by the camera 9 immediately after the shielding plate 26 shields the TIG electrode 5.

  Therefore, the shielding plate 26 eliminates the influence of the emitted light from the TIG electrode 5 and the reflection of the emitted light, and the time to cover and hide the TIG electrode 5 is very short, so the TIG electrode 5 is shielded. It is possible to obtain an image in which the shielding plate 26 is heated and the irregular reflection of the secondary radiation from the shielding plate 26 and the change in the temperature condition are minimized, and the observation area 11 immediately after welding can be obtained. Temperature distribution can be accurately measured.

  Further, by using a high-speed camera as the camera 9 and continuously acquiring an image of the observation area 11 and measuring a temperature distribution, it is possible to measure the state of temperature change of the observation area 11. By measuring the state of the temperature change of the observation area 11, for example, it is possible to obtain the correlation between the generation state of the high temperature crack after welding and the temperature distribution.

  Further, since the black alumite treatment is applied to the shielding plate 26, it is possible to suppress the secondary reflection of the radiation light by the shielding plate 26, and to more accurately measure the temperature distribution of the observation area 11. Can.

  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 wound on the surface of a copper plate 42, and the water is circulated in the water-cooled pipe 43 to cool the copper plate 42.

  By using the water-cooled copper plate 41, the shielding effect of the TIG electrode 5 can be enhanced, and an accurate temperature distribution of the observation area 11 can be measured without arcing the arc 6. In this case, the shutter device 12 is operated immediately before acquiring an image of the observation area 11, and immediately after the TIG electrode 5 is covered and concealed by the shielding plate 26 (the water-cooled copper plate 41). By obtaining an image, the time during which the TIG electrode 5 is covered by the shielding plate 26 (the water-cooled copper plate 41) becomes instantaneous, and the influence of shielding can be minimized.

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

  Further, the shielding plate 26 is not limited to black, and it is needless to say that other colors may be used as long as the secondary reflection of the radiation light by the shielding plate 26 can be suppressed.

  Next, a second embodiment of the present invention will be described with reference to FIGS. 6 (A) and 6 (B). 6 (A) and 6 (B), the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted.

  In the first embodiment, welding is performed on an object to be welded 3 whose surface shape is horizontal, and an image of the observation area 11 is acquired. When welding is performed according to FIG. 1) and the workpiece 3 is forcibly bent and distorted in a state where the workpiece 3 is subjected to temperature distribution, the surface of the workpiece 3 at the time of image acquisition The shape is curved and not horizontal.

  When the shutter unit 14 of the first embodiment is applied to such a workpiece 3 to be welded, the lower end of the shielding plate 26 is straight when the shutter device 12 (see FIG. 1) is operated. In the direction in which the heat source is covered rather than the shielding plate 26, that is, a gap is generated between the shielding plate 26 and the workpiece 3. For this reason, the gap between the shielding plate 26 and the workpiece 3 is the reflected light of the emitted light from the TIG electrode 5 (see FIG. 1) which is a heat source and the reflected light reflected by the observation region 11. To the camera 9 (see FIG. 1), and noise 39 (see FIG. 4B) occurs in the acquired temperature distribution image.

  In the second embodiment, an auxiliary shutter 45 is provided on the shielding plate 26 so that the gap between the shielding plate 26 and the workpiece 3 can be covered by the auxiliary shutter 45. Hereinafter, the auxiliary shutter unit 45 will be described.

  A support block 46 is fixed to one of the front surface and the rear surface of the shielding plate 26 by a fastener such as a screw. A guide shaft 47 is slidably inserted in the support block 46, and a flange portion 48 for retaining is formed at an upper end portion of the guide shaft 47.

  At the lower end of the guide shaft 47, a support arm 51 extending in the horizontal direction is fixed, and at the center of the support arm 51, a rectangular plate-like auxiliary shielding plate 49 is provided. At both ends of the support arm 51, a movable auxiliary shield support 52 is provided so as to project downward.

  The movable auxiliary shielding plate support portion 52 is provided with a movable auxiliary shielding plate 53 so as to extend toward the auxiliary shielding plate 49, and one end portion of the movable auxiliary shielding plate 53 is via the rotation shaft 54. It is supported and is rotatable relative to the shielding plate 26. A rotation stopper 55 is formed on the movable auxiliary shielding plate support portion 52, and the rotation stopper 55 restricts the rotation of the movable auxiliary shielding plate 53 by the rotation stopper 55 in a state of being rotated downward by a predetermined amount by its own weight.

  Further, a spring 56 which is an auxiliary spring member or an auxiliary biasing member is provided in a compressed state between the support block 46 and the auxiliary shielding plate 49. The guide shaft 47 is inserted into the spring 56, and the auxiliary shielding plate 49 is biased downward by the spring 56, that is, in the direction to cover the heat source.

  As shown in FIG. 6A, when the shutter device 12 is not in operation, the flange portion 48 is in contact with the support block 46 by the biasing force of the spring 56, and the auxiliary shielding plate 49 The movable auxiliary shielding plate 53 protrudes below the lower end of the shielding plate 26, that is, in the direction to cover the heat source. Further, the lower end of the auxiliary shielding plate 49 is located above the lower end of the movable auxiliary shielding plate 53.

  When the shutter device 12 is operated, the shielding plate 26 instantaneously moves below the stationary position by the biasing force of the compression spring 18 (see FIG. 1). At this time, the lower end of the movable auxiliary shielding plate 53 instantaneously contacts the object to be welded 3, and the movable auxiliary shielding plate 53 contacts the surface of the object to be welded 3 as shown in FIG. By contact, the movable auxiliary shielding plate 53 rotates following the surface shape of the workpiece 3.

  By the rotation of the movable auxiliary shielding plate 53, the gap between the shielding plate 26 and the workpiece 3 is covered by the movable auxiliary shielding plate 53. In this state, by photographing the observation area 11, the emitted light of the TIG electrode 5 and the reflected light of the emitted light from the gap between the shielding plate 26 and the workpiece 3 are blocked. Therefore, even in the case of the workpiece 3 whose surface shape is not horizontal, an image from which noise light is removed can be acquired, and the temperature distribution of the observation area 11 can be accurately measured.

  Further, since the lower end of the auxiliary shielding plate 49 is positioned above the movable auxiliary shielding plate 53, the auxiliary shielding plate 53 is in a state where the movable auxiliary shielding plate 53 is in contact with the object 3 to be welded. 49 will be separated from the surface of the said to-be-welded object 3, and it can prevent that the said auxiliary | assistant shielding board 49 contacts the molten pool 8 (refer FIG. 1) directly.

  Next, referring to FIGS. 7A and 7B, a third embodiment of the present invention will be described. In FIGS. 7A and 7B, the same components as those in FIGS. 6A and 6B are denoted by the same reference numerals, and the description thereof will be omitted.

  In the auxiliary shutter portion 45 of the third embodiment, a plurality of guide shafts 47 are slidably inserted in the support block 46, and in FIG. 7A and FIG. 7B, six guide shafts 47 are slidably inserted. An auxiliary shielding plate support 57 is attached to the lower end of the guide shaft 47, and an auxiliary shielding plate 58 is attached to the auxiliary shielding plate support 57 via a fastener 59 such as a screw. The respective auxiliary shielding plates 58 are supported so as to be independently displaceable in the vertical direction.

  Further, a spring 56 is fitted on each of the guide shafts 47 in a compressed state between the support block 46 and the auxiliary shielding plate support portion 57, and the auxiliary shielding plate 58 is located below by the spring 56, that is, a heat source It is energized in the direction to overthrow.

  As shown in FIG. 7A, when the shutter device 12 (see FIG. 1) is not in operation, each flange portion 48 contacts the support block 46 by the biasing force of the spring 56, and the auxiliary shielding is performed. The plate 58 protrudes below the lower end of the shielding plate 26, that is, in the direction of covering the heat source.

  When the shutter device 12 is operated, the lower ends of the respective auxiliary shielding plates 58 instantaneously contact the object to be welded 3, as shown in FIG. 7B, the auxiliary shielding plates 58. Respectively contact the surface of the object to be welded 3 and the spring 56 is bent according to the surface shape of the object 3 to be welded, and the envelope of the lower end of each auxiliary shielding plate 58 is the surface shape of the object 3 to be welded It follows the shape of

  Therefore, the gap between the shielding plate 26 and the workpiece 3 is covered by the auxiliary shielding plate 58. By photographing the observation area 11 in this state, the emitted light of the TIG electrode 5 (see FIG. 1) and the reflected light of the emitted light from the gap between the shielding plate 26 and the workpiece 3 are obtained. Even in the case of the to-be-welded object 3 which is blocked and whose surface shape is not horizontal, an image without noise light can be obtained, and the temperature distribution of the observation area 11 can be accurately measured.

  In the third embodiment, although the auxiliary shielding plate 58 is attached to the auxiliary shielding plate support portion 57 by the fixing device 59, the fixing device 59 is used as a rotation shaft, and the auxiliary shielding plate 58 is rotated. It may be provided freely. By making the auxiliary shielding plate 58 rotatable, the auxiliary shielding plate 58 can be rotated along the surface shape of the object to be welded 3 in contact with the object to be welded 3, The shielding effect of the emitted light of the electrode 5 and the reflected light of the emitted light can be further enhanced.

  In addition, the position of the lower end of the auxiliary shielding plate 58 may be gradually raised toward the center when the shutter device 12 is not in operation. The lower end of the auxiliary shielding plate 58 on the center side is positioned above the lower end of the auxiliary shielding plate 58 on the end side, that is, the auxiliary shielding plate 58 on the end side. When the shutter device 12 is actuated, the lower end of the shutter projects more in the direction of covering the heat source than the position of the lower end of the auxiliary shielding plate 58 on the center side, so that Only the auxiliary shielding plate 58 can be brought into contact with the object 3 to be welded, and the auxiliary shielding plate 58 can be prevented from being in direct contact with the molten pool 8 (see FIG. 1).

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 12 shutter apparatus 14 shutter part 15 ridge part 16 scale piece (engagement member)
Reference Signs List 17 solenoid (actuator) 26 shielding plate 41 water-cooled copper plate 45 auxiliary shutter portion 49 auxiliary shielding plate 53 movable auxiliary shielding plate 58 auxiliary shielding plate

Claims (5)

  A high temperature observation apparatus having a camera capable of acquiring an image of an observation area adjacent to a heat source forming a molten pool on a measurement object, and a shutter unit, wherein the shutter unit covers the heat source; An elastic member which biases the shutter in a direction to cover the heat source, and an engaging member which engages with a hook provided on the shutter to restrain the shutter at a position where the heat source is exposed; A shutter plate that shields the light emitted from the heat source, and a movable auxiliary shield plate that is displaceable with respect to the shield plate. And the shutter unit is operated, the shutter unit is instantaneously slid by the biasing force of the resilient member, the heat source is covered by the shielding plate, and the measurement target is Follow the surface of the object Displaced hot section observation device the camera immediately acquires an image of the observation area the gap is hidden covered between the movable auxiliary shielding the measurement object and the shielding plate by plate.   The auxiliary shutter portion includes an auxiliary shielding plate provided at a central portion of the shielding plate, and the movable auxiliary shielding plate rotatably provided so as to extend from the end portion side of the shielding plate toward the auxiliary shielding plate. The high temperature part observation device according to claim 1, further comprising: an auxiliary resilient member for biasing the auxiliary shielding plate and the movable auxiliary shielding plate in a direction to cover the heat source.   The movable auxiliary shield projects from the auxiliary shield in a direction covering and covering the heat source, and the auxiliary shield from the object under measurement with the movable auxiliary shield in contact with the surface of the object to be measured. The high temperature part observation device according to claim 2 which is separated.   The auxiliary shutter portion has a plurality of auxiliary shielding plates provided independently and displaceably, and an auxiliary spring member for biasing the auxiliary shielding plate in a direction to cover the heat source, and the auxiliary shielding portion The high temperature part observation device according to claim 1, wherein the plate protrudes in a direction of covering the heat source more than the shielding plate.   The high temperature part observation device according to claim 4, wherein the auxiliary shielding plate is rotatably provided.

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