JP2000009652A - Device for detecting crack of flame spray coating of boiler furnace wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily detect the cracks in a flame spray coating by reducing actual operations requiring a worker to enter a furnace. SOLUTION: A device consists of a rail stand 2 for detachably mounting to the inner surface of a boiler furnace wall 1, a scanning truck 3 that is supported so that it can travel on the rail stand 2, a radio CCD camera 4 being provided in the scanning truck 3, an image receiver 5 and an image display 6 for visualizing an image signal from the CCD camera 4, and an image- processing device 7 for analyzing the image. While the scanning truck 3 is moved, the CCD camera 4 picks up the image of the inner surface of the boiler furnace wall 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a crack in a sprayed coating on a boiler furnace wall, which can remotely detect a crack in a sprayed coating formed on the inner surface of the boiler furnace wall.

[0002]

2. Description of the Related Art In general, a metal spray coating is applied to the inner surface of a furnace wall of a power generation boiler in order to improve abrasion resistance and the like.

[0003] When the thermal sprayed coating deteriorates due to aging, cracks (cracks) occur, so that it is necessary to periodically inspect the thermal sprayed coating. Therefore, conventionally, a color check (dip-color flaw detection inspection) or a visual inspection is performed.

[0004]

However, in the case of the color check, the inspection is not completed by itself, but the final judgment is that the entire inner surface of the furnace wall is visually inspected. It is a fact. Therefore, there is a problem that it takes time and effort, and it costs a lot of money.
The visual inspection is an unfavorable environmental operation performed by a worker entering the furnace, which is not preferable for health and mental health.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an apparatus for detecting a crack in a sprayed coating on a boiler furnace wall, in which a worker can easily detect a crack in the sprayed coating without entering the furnace. .

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a rail base for detachably attaching to an inner surface of a boiler furnace wall, and a scanning unit movably engaged with and supported by the rail base. A cart and a wireless C mounted on the scanning cart
It comprises a CD camera, a video receiver and a video display for receiving a video from the CCD camera, and a video processing device for processing the displayed video and detecting cracks in the thermal spray coating.

A rail stand is set on the inner surface of the boiler furnace wall, and the scanning carriage is moved along the rail stand while the CCD is moved.
Have the camera shoot the inside of the furnace wall. The captured video is displayed on a video display via a video receiver, and analyzed by a video processing device. Therefore, cracks in the thermal spray coating on the inner surface of the furnace wall are detected outside the furnace.

Further, if the CCD camera is configured to be able to move and adjust in a direction perpendicular to the moving direction of the scanning carriage, a wide range of inspection can be performed without changing the rail base each time.

[0009]

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

FIGS. 1 and 2 show an embodiment of the present invention, in which a number of boiler tubes 1a arranged in parallel,
Fin plate 1b connecting adjacent tubes 10
A rail base 2 for detachably attaching to the inner surface of the boiler furnace wall 1 comprising: a scanning carriage 3 movably engaged with and supported by the rail base 2; A possible wireless CCD camera 4, a video receiver 5 for receiving a video signal from the CCD camera 4, a video display 6 for displaying the video signal received by the video receiver 5 as a video (image), The image display device 6 is provided with an image processing device 7 for analyzing an image displayed on the image display 6 in black and white binary to detect an abnormal part.

The rail base 2 has a structure in which a rack 8 is provided on the front surface along the longitudinal direction, a magnet 9 such as an electromagnet is mounted on the rear surface, and rail grooves 10 along the longitudinal direction are provided on both left and right sides. The magnet 9 can be detachably set on the surface of the boiler tube 1a of the boiler furnace wall 1.

The scanning carriage 3 has frames 3a and 3b which are arranged one above the other. The rear frame 3b is
Wheels 11 adapted to fit into the right and left rail grooves 10 of the rail base 2 are provided on the rear surface, and a pinion 12 meshed with the rack 8 of the rail base 2 therein, and a brake for driving the pinion 12 are provided inside. And a scanning motor 13 provided with the scanner.

On the other hand, the front frame 3a has a screw rod 15 which is rotatable inside by being driven by a position adjusting motor 14 installed on the outside, and extends in the left-right direction which is a direction perpendicular to the rail base 2. And the screw rod 1
5, a rotation restricting member 1 fixed in parallel with the screw rod 15.
6 is screwed with a nut 17 whose rotation is regulated by the arm 6, and furthermore, the arm 1 is arranged on the nut 17 in the left-right direction such that the tip side penetrates the side wall of the front frame 3 a.
8, the CCD camera 4 is attached to the distal end of the arm 18 via a holder member 19.

When inspecting the sprayed coating on the inner surface of the boiler furnace wall 1, the rail base 2 is previously set up and down on the surface of the required boiler tube 1a by the attraction force of the magnet 9, and The position of the CCD camera 4 is adjusted so as to be directed to the surface of the adjacent boiler tube 1a where 2 is set.

In the above state, the switch of the CCD camera 4 is turned on, and the scanning carriage 3 positioned at, for example, the upper end of the rail base 2 is moved toward the lower end. In this case, when the scanning motor 13 of the rear frame 3b is driven, the pinion 12 meshing with the rack 8 on the rail base 2 is rotated, so that the entire scanning carriage 3 is scanned and moved by the rolling power of the pinion 12. .

When the scanning carriage 3 is moved as described above, the CCD camera 4 moves the boiler tube 1 adjacent to the boiler tube 1a on which the rail base 2 is set.
The surface of a is photographed.

When the scanning carriage 3 reaches the lower end position of the rail base 2, the position adjusting motor 14 mounted on the front frame 3a is driven in a required direction, and the nut 17 is rotated by rotating the screw rod 15. The movement causes the arm 18 to protrude from the side wall of the front frame 3a by a required amount. As a result, as shown by a two-dot chain line in FIG.
The CD camera 4 is moved to the position of the next boiler tube 1a. Thereafter, the scanning motor 13 is rotated in the reverse direction to move the scanning carriage 3 from the lower end to the upper end of the rail base 2.
The surface of the boiler tube 1a is photographed by the D camera 4.

When the scanning carriage 3 reaches the upper end of the rail base 2, next, the setting place of the rail base 2 is moved, and photographing by the CCD camera 4 is performed while moving the scanning carriage 3 in the same procedure as described above. Try to repeat it as many times as necessary.

In the above, the image captured by the CCD camera 4 is sent to an external image receiver 5 by radio, and is displayed and monitored on an image display 6. Next, this image is sent to the image processing device 7, where the image is binarized and analyzed to detect cracks in the thermal spray coating.

As described above, since the radio CCD camera 4 is mounted on the scanning trolley 3 and the photographing is performed while moving, the time for the worker to enter the boiler furnace and perform the substantial work under the bad environment is reduced. This can drastically reduce the total inspection time. Further, since the CCD camera 4 is cordless, the scanning range is widened, and, for example, the inspection work can be smoothly performed without paying attention to the interference between the cord and the scaffold.

The present invention is not limited to the above embodiment. The mechanism for moving the scanning carriage 3 includes a rack and a pinion and a screw such as a position adjusting mechanism of a CCD camera shown in FIG. It goes without saying that various mechanisms such as a combination of a rod and a nut can be adopted, and various changes can be made without departing from the gist of the present invention.

[0022]

As described above, according to the apparatus for detecting a sprayed coating crack on a boiler furnace wall of the present invention, a rail base for detachably attaching to the inner surface of a boiler furnace wall and a movable base on the rail base. A scanning carriage supported by the scanning carriage, a wireless CCD camera mounted on the scanning carriage, an image receiver and an image display for receiving an image from the CCD camera, and a crack in the thermal spray coating by processing the displayed image. And a video processing apparatus for detecting the cracks, it is possible to substantially eliminate the substantial work performed by the worker entering the boiler furnace in a bad environment, and the cracks in the thermal spray coating can be easily detected. At the same time, inspection time can be greatly reduced,
In addition, by adopting a configuration in which the CCD camera can be moved and adjusted in a direction perpendicular to the moving direction of the scanning carriage, an excellent effect of being able to be applied to a wide range without changing the rail base each time is achieved. Demonstrate.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a thermal spray coating crack detecting apparatus for a boiler furnace wall according to the present invention.

FIG. 2 is an enlarged view taken on line AA of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Boiler furnace wall 2 Rail stand 3 Scanning trolley 4 CCD camera 5 Image receiver 6 Image display 7 Image processing device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Saburo Shibata 1st Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Pref. Ishikawajima-Harima Heavy Industries Co., Ltd. No. 1 Ishi Kawashima Harima Heavy Industries, Ltd. Technical Research Laboratory F-term (reference) 2G051 AA82 AA90 AB20 AC17 CA03 CA04 CD04 EA11 FA10 4K056 BB01 FA24

Claims (2)

[Claims] 1. A rail base for removably attaching to an inner surface of a boiler furnace wall, a scanning carriage movably engaged with and supported by the rail base, and a wireless C mounted on the scanning carriage.
It has a configuration comprising a CD camera, a video receiver and a video display for receiving a video from the CCD camera, and a video processing device for processing the displayed video and detecting cracks in the thermal spray coating. Thermal spray coating crack detector for boiler furnace wall. 2. The apparatus according to claim 1, wherein the CCD camera can be moved and adjusted in a direction perpendicular to the moving direction of the scanning carriage.