JP2774446B2 - Radiation irradiation equipment for pipe inspection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation inspection apparatus for piping inspection.

[0002]

2. Description of the Related Art FIGS. 7 and 8 show an example of a conventional radiation inspection apparatus for pipe inspection, in which a pipe 1 for performing a radiation transmission test of a welding line or the like is provided with an all-circumferential radiation type (panorama). A radiation irradiation tube 3 provided with a radiation generator 2 is arranged via a support 4 so as to be concentric with the pipe 1, and a film 5 is wound around the outer periphery of the pipe 1, or A line sensor (see FIG. 5) is provided so that measurement can be performed while traveling along the outer circumference.

[0003] The full-radiation radiation generator 2 is shown in FIG.
The electrons 7 emitted from the filament 6 as shown in FIG.
A conical target 8 having a conical shape and arranged so that the apex thereof is directed to the filament 6 is applied, whereby radiation 9 is irradiated from the conical target 8 in the entire circumferential direction.

When a radiation irradiation tube 3 provided with the above-described full-radiation type radiation generator 2 is used, a film 5
The radiation permeation test can be simultaneously performed on the entire circumference of the pipe 1 by a single operation by arranging the above, so that the operation of the radiation permeation test can be efficiently performed.

However, the radiation transmission test using the radiation irradiating tube 3 provided with the above-mentioned conventional full-radiation radiation generating apparatus 2 has a problem that the image of the irradiated film 5 is blurred. .

More specifically, the conical target 8 of the full-radiation radiation generating apparatus 2 shown in FIG. 8 has an axial length (cone height) of 0.4 mm to 0.5 mm, and Since the large diameter portion is 4.0 to 5.0 mm and the diameter is large, the radiation 9 from the conical target 8 as shown in FIG.
When light is transmitted through the pipe 1, looking at one point on the inner surface of the pipe 1, “blurring” occurs due to an image shift X in the film 5 portion. This “blur” is small when the distance between the conical target 8 and the pipe 1 is long, but becomes larger as the distance between the conical target 8 and the pipe 1 becomes shorter. Since the diameter of the ordinary irradiation tube 3 is about 300 to 400 mm,
When performing a test on the pipe 1 having a diameter close to the diameter of the irradiation tube 3, there is a problem that the "blur" becomes large and measurement with high accuracy cannot be performed.

Further, as a radiation irradiating tube capable of reducing the problem of "blur", there is known a radiation irradiating tube 11 provided with a single radiation type radiation generator 10 as shown in FIG.

The single-radiation type radiation generating apparatus 10 is designed to apply the electrons 7 emitted from the filament 6 to a mirror-shaped flat plate target 12 so that the radiation 9 reflected by the flat plate target 12 spreads outward by a required amount. It is designed to be illuminated at an angle.

In the radiation irradiating tube provided with the single radiation type radiation generator 10, the flat plate target 12 has an axial length of 1.0 to 1.5 mm and a circumferential length of 1.0 to 1.5 mm.
Since the size is on the order of millimeters, the size is much smaller than that of the conical target 8, so that the occurrence of the "blur" can be greatly reduced.

[0010]

However, the radiation irradiating tube 11 provided with the single radiation type radiation generator 10 radiates the radiation 9 at a required spread angle α (about 40 ° to 45 °) in the radial direction. Therefore, it is difficult to use the radiation transmission test for inspecting the entire circumference of the pipe 1 because the radiation 9 needs to be performed while changing the direction of the radiation 9. It is currently not used.

The present invention has been made in view of such circumstances, and uses a radiation irradiation tube provided with a single-radiation type radiation generator to perform a radiation transmission test of piping with high accuracy and relatively simple operation. It is an object of the present invention to provide a radiation inspection apparatus for pipe inspection that can be implemented efficiently.

[0012]

SUMMARY OF THE INVENTION The present invention comprises a plurality of support legs, which are extendable and contractible on the outer periphery of a rotating support and have running wheels at their ends, and concentrically support the rotating support in a pipe. Irradiation tube supporting device, and a single radiation type radiation generating device which is rotatably supported by a rotating support of the irradiation tube supporting device, has an irradiation port at one place on the outer periphery, and emits radiation toward the irradiation port A radiation irradiation tube having a built-in, a rotation driving device for rotating the radiation irradiation tube provided in the irradiation tube support device, and a control device for controlling the rotation of the rotation driving device. Inspection radiation irradiation device, and
The present invention relates to a piping inspection radiation irradiation device, wherein the radiation irradiation tube includes a weight for positioning the origin.

[0013]

According to the first aspect of the present invention, since the radiation transmission test of the pipe is performed by using the radiation irradiation tube provided with the single radiation type radiation generator, "blur" of the image is minimized by the small flat target. Can be suppressed.

Further, the radiation irradiation tube incorporating the single-radiation type radiation generator supported by the irradiation tube support device is driven to rotate by a rotation driving device, and the driving of the rotation driving device is controlled by a control device. Therefore, the radiation transmission test of the entire circumference of the pipe can be efficiently performed by a relatively simple operation by arbitrarily changing the radiation irradiation direction.

According to the second aspect of the present invention, since the radiation irradiating tube is provided with the weight for positioning the origin, even if the radiation irradiating apparatus for pipe inspection is inserted deep into the pipe, the position where the irradiation port faces is kept at a fixed position. Therefore, the start position of the radiation transmission test can be arbitrarily adjusted by knowing from outside the pipe.

[0016]

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

FIGS. 1 and 2 show an embodiment of a radiation inspection apparatus for pipe inspection according to the present invention, in which an extensible and T-shaped tip is provided on the outer periphery of a cylindrical rotary support 13. (Three in the figure) supporting legs 15 having running wheels 14
An irradiation tube supporting device 16 having a configuration including The irradiation tube support device 16 can support the rotary support 13 concentrically with the pipe 1 by the expansion and contraction of the support legs 15 when the irradiation tube support apparatus 16 is disposed in the pipe 1 for performing a radiation transmission test. The support leg 15 is, besides the telescopic system shown in the figure,
A configuration that expands and contracts in a pantograph manner may be used.

The rotary support 13 of the irradiation tube support device 16
The radiation irradiating tube 11 which can be freely rotated by the support wheel 17 by fitting into the radiation irradiating tube.

The radiation irradiation tube 11 has a built-in monoradiation type radiation generator 10 similar to that shown in FIG. 10, and is provided at one location on the outer periphery corresponding to the direction of the flat plate target 12 of the monoradiation type radiation generator 10. An irradiation port 18 is formed so that the radiation 9 is radiated outward.

The irradiation tube support device 16 is provided with a rotary drive device 21 having a drive pinion 20 that meshes with a gear 19 provided on the outer periphery of the radiation irradiation tube 11. A rotation position detector 22 such as an encoder is provided.
The rotation position detector 22 is connected to a control device 23 that controls the rotation and the operation of the single-emission type radiation generator 10 so that the rotation position of the radiation irradiation tube 11 is controlled.

At a required position on the outer periphery of the radiation irradiation tube 11, a weight 24 for positioning the origin is attached.

FIG. 3 shows an example of a case where the entire periphery of the pipe 1 is subjected to a radiation transmission test using the film 25 by the radiation inspection apparatus for pipe inspection of the present invention.

FIGS. 4 to 6 show an example of a case where the entire circumference of the pipe 1 is subjected to a radiation transmission test using a line sensor by the radiation inspection apparatus for pipe inspection according to the present invention. Rails 26 provided for running the automatic welding machine
, A line sensor 27 is provided.

As shown in FIG. 5, the line sensor 27 is provided with a fluorescent plate 28 for receiving the radiation 9 in close proximity to the outer peripheral surface of the pipe 1 and a mirror 29 for changing the direction of the radiation 9 taken from the fluorescent plate 28. A camera 31 that captures the radiation 9 from the mirror 29 through a lens 30, an image processing device 32 that processes an image from the camera 31, and a monitor 33 connected to the image processing device 32. And is connected to the control device 23.

Next, the operation of the above embodiment will be described.

When performing a radiation transmission test on the entire circumference of the pipe 1 using a film by the radiation inspection apparatus for pipe inspection according to the present invention, as shown in FIG. 3, the spread angle of the radiation 9 by the plate-like target (FIG. 10). The outer peripheral surface of the pipe 1 is divided into sections a (10 sections in the drawing) at an angle slightly smaller than α, and a film 25 having an area slightly larger than the spread angle α is attached to the outer surface of the pipe 1 every other section a. Subsequently, the direction of the irradiation port 18 is adjusted by rotating the irradiation tube 11 so that the center b of the spread angle α of the radiation 9 is located at the center in the circumferential direction of one film 25. At this time, when the radiation irradiation tube 11 is provided with the weight 24 so that the direction of the irradiation port 18 is directed downward, the radiation irradiation tube 11 may be attached such that the center in the circumferential direction of the film 25 is located immediately below the center of the pipe 1. .

Subsequently, the single-radiation type radiation generator 10 is activated to perform a radiation transmission test. After the single-radiation type radiation generator 10 is stopped, the radiation irradiation tube 11 is divided by the rotary driving device 21 into the divided section a. Rotate by two angles. Then, the irradiation port 18 is set to the irradiated film 25.
This corresponds to the film 25 at a position skipped by one. In this state, a radiation transmission test is performed in the same manner as described above, and thereafter, the above operation is repeated to perform an intermittent inspection, thereby completing the radiation transmission test at the position of the film 25 attached every other one.

Subsequently, the film 25 whose inspection has been completed
Is peeled off, and a new film 25 is placed at the skipped section position.
The remaining outer peripheral portion of the pipe 1 is inspected by performing the same intermittent radiation transmission test as described above by attaching a, and the test of the entire circumference of the pipe 1 is completed.

According to the above-described inspection method, a continuous film is adhered to the entire circumference of the pipe 1 and the radiation irradiation pipe 1 is attached.
By repeating the operation of rotating the radiation 1 at an angle slightly smaller than the spread angle α of the radiation 9 and the radiation transmission test, the entire circumference of the pipe 1 can be inspected. There is a problem that "blur" occurs in the overlapped portion and high-precision inspection cannot be performed.

On the other hand, when the intermittent inspection is repeated twice as described above, "blur" due to the overlap between the adjacent members does not occur, and a highly accurate inspection can be performed.

When the entire circumference of the pipe 1 is subjected to the radiation transmission test using the line sensor 27 by the radiation inspection apparatus for pipe inspection of the present invention, the spread angle α of the radiation 9 is the same as described above.
The outer peripheral surface of the pipe 1 is sectioned at a slightly smaller angle (a section in the figure) (10 sections), and the radiation irradiation tube 11 is rotated so that the center b of the radiation 9 is located at one central position of the section a. The direction of the irradiation port 18 is adjusted. Further, the line sensor 27 is arranged in one section a in which the irradiation port 18 is opposed.
To one end of

Next, the single radiation type radiation generator 10 is activated to emit the radiation 9, and the inspection is performed while moving the line sensor 27 by the one section a as shown by the arrow in FIG. Do. The image signal inspected by the line sensor 27 is processed by the image processing device 32, recorded, and displayed on the monitor 33.

Subsequently, the operation of the single-radiation type radiation generator 10 is stopped, the radiation irradiation tube 11 is rotated by the one section a, the single-radiation type radiation generator 10 is activated again, and the line sensor is activated. The inspection is performed while moving 27 by one section a. Thereafter, by repeating the same operation, the radiation transmission test on the entire circumference of the pipe 1 is completed.

As described above, since the radiation transmission test of the pipe 1 is performed using the radiation irradiation tube 11 provided with the single radiation type radiation generator 10, the small flat target 12 minimizes the “blur” of the image. As a result, the radiation transmission test of the pipe 1 can be performed with high accuracy.

Further, the radiation irradiation tube 11 containing the single radiation type radiation generator 10 supported by the irradiation tube support device 16
Is driven by the rotary driving device 21 and the driving of the rotary driving device 21 is controlled by the control device 23. Therefore, the irradiation direction of the radiation 9 is arbitrarily changed and the entire circumference of the pipe 1 is relatively easily operated. Radiation test can be performed efficiently.

Further, since the irradiation tube is provided with the weight 24 for positioning the origin, when the rotation driving device 21 is in a free state, the irradiation tube 11 is rotated so that the weight 24 for positioning the origin faces downward. The irradiation port 18 is automatically adjusted so as to face a predetermined position. Therefore, even if the pipe irradiation radiation irradiation apparatus is inserted deep into the pipe 1, the start position of the radiation transmission test is known from outside the pipe. It can be adjusted arbitrarily.

[0037]

According to the first aspect of the present invention, since the radiation transmission test of the pipe is performed by using the radiation irradiation tube equipped with the single radiation type radiation generator, the "blur" of the image is reduced by the small flat target. It is possible to perform the radiation transmission test of the piping with a minimum amount of precision.

Further, the radiation irradiation tube incorporating the single-radiation type radiation generator supported by the irradiation tube support device is driven by the rotation driving device, and the driving of the rotation driving device is controlled by the control device. The radiation transmission test of the entire circumference of the pipe can be efficiently performed by a relatively simple operation by arbitrarily changing the radiation irradiation direction.

According to the second aspect of the present invention, since the radiation irradiating tube is provided with the weight for locating the origin, when the rotary driving device is in a free state, the radiation irradiating tube is rotated so that the weight for locating the origin faces downward. It is automatically adjusted so that the irradiation port is directed to a certain position, so even if the pipe irradiation radiation irradiation device is installed deep in the pipe, the start position of the radiation transmission test can be known from outside the pipe Can be adjusted.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a front view showing an example of a case where a radiation transmission test is performed using a film by the apparatus of the present invention.

FIG. 4 is a front view when the device of the present invention is provided with a line sensor.

FIG. 5 is an explanatory diagram illustrating an example of a line sensor.

FIG. 6 is a front view illustrating an example of a case where a radiation transmission test is performed using a line sensor.

FIG. 7 is a front view showing a state in which a radiation transmission test of a pipe is performed using a radiation irradiation tube provided with a conventional full-radiation radiation generator.

FIG. 8 is a schematic side view illustrating an example of a full-radiation radiation generator.

FIG. 9 is a front view showing a problem of a radiation transmission test using a radiation irradiation tube provided with a full-radiation radiation generator.

FIG. 10 is a schematic side view showing an example of a single radiation type radiation generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piping 9 Radiation 10 Single radiation type radiation generator 11 Radiation irradiation tube 13 Rotation support 14 Running wheel 15 Support leg 16 Irradiation tube support device 18 Irradiation port 21 Rotation drive device 23 Control device 24 Weight for origin positioning

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Akitaka Fujita 1-7-7 Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Within Tokyo Gas Co., Ltd. (56) References JP-A-5-2966753 (JP, A) JP-A-6-130001 (JP, A) JP-A-6-82429 (JP, A) JP-A-55-14820 (JP, U) JP-B-47-18186 (JP, B1) (58) Int.Cl. ⁶ , DB name) G01N 23/04 G01N 23/18 G03B 42/02 G21K 5/02 G01N 29/00-29/28

Claims (2)

(57) [Claims] 1. An irradiation tube support device comprising a plurality of support legs which are extendable and contractible on the outer periphery of a rotating support and have a running wheel at a tip, and which can support the rotating support concentrically in a pipe,
A radiation irradiation tube having a built-in single-emission type radiation generator that has an irradiation port at one location on the outer periphery and is rotatably supported by a rotary support of the irradiation tube support device and emits radiation toward the irradiation port; A radiation inspection apparatus for pipe inspection, comprising: a rotation driving device provided in the irradiation tube support device for driving the radiation irradiation tube to rotate; and a control device for controlling rotation of the rotation driving device. 2. The radiation inspection apparatus for pipe inspection according to claim 1, wherein the radiation irradiation pipe has a weight for positioning the origin.