JP2001083277A - Apparatus and method for inspection of tubing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the replacement operation of a film and to shorten the time of an inspection operation when tubing is inspected by a method wherein a rotatable imaging plate support and a carriage for measurement are operated. SOLUTION: An imaging device 20 is installed on the surface of a rail 25, for running, a radiation source assembly 21 is installed at an end part on the rear surface, and a feeder tube 24 as an object to be inspected is photographed. After its photographing operation is finished, a small motor is driven, an imaging plate 7 is returned to the side of a carriage 6A for movement, an imaging plate support 1 is turned to the opposite side of the feeder tube 24 by driving a motor for rotation, and a holder 5 is taken out. The holder 5 which is replaced by a new imaging plate 7 is attached to the imaging plate support 1 so as to be turned, and the imaging plate 7 is directed to the side of the feeder tube 24. The small motor is driven, the imaging plate 7 is moved to the side of a feeder pipe 24 which is to be inspected next, the carriage 6A for movement is moved, and the imaging device and the radiation source assembly 21 are moved up to the position of the feeder tube 24. This operation is repeated, and different feeder tube 24 are photographed one after another.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping inspection device and a piping inspection method, and more particularly to a piping inspection device and a piping inspection suitable for nondestructively inspecting piping installed in a nuclear power plant or a thermal power plant. About the method.

[0002]

2. Description of the Related Art At a nuclear power plant, a radiation transmission type test (Ra
diographic testing (hereinafter, referred to as RT). The principle of RT is as follows. Radiation emitted from the radiation source hits the inspection object. Some of the radiation is reflected, while the rest is transmitted and reaches the opposite film. Radiation has a property that the reflectance and the transmittance are different depending on the material of the object, so that a transmission image of the object is projected on the film. This makes it possible to check the thickness of the pipe or the inclusions inside.

[0003] Japanese Patent Application Laid-Open No. 11-2688 describes that the inside of a drain nozzle connected to the lower part of a reactor pressure vessel is inspected using RT. This RT examines the soundness of the weld between the elbow and the straight pipe. The procedure is to move the source positioning device in advance along the horizontal part of the drain nozzle to align the front, lower, and side transmission pipes with the position to be inspected, and place a film pressing cart with a film on the opposite side across the drain nozzle. Thereafter, a line source is inserted into each of the transmission tubes to perform an inspection. The source positioning device and the film pressing device are first installed near the wall of a cylindrical building, and run on a beam parallel to the horizontal portion of the drain nozzle to move to an object.

[0004]

According to the above-mentioned prior art, in the case where the photographing is performed several times, it is necessary to return the film pressing device to the place where the film pressing device is first installed (by the wall of the cylindrical building) every time one photographing is completed. And workability is poor.

It is an object of the present invention to provide a piping inspection device and a piping inspection method in which film exchange can be performed in a short time.

[0006]

SUMMARY OF THE INVENTION A feature of the present invention to achieve the above-mentioned object is to provide an imaging plate support capable of rotating or moving the imaging plate horizontally.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A piping inspection apparatus according to a preferred embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, 4, 5, 6, and 7. FIG. The piping inspection device includes an imaging device (hereinafter, referred to as an imaging device) having the imaging plate 7 and a radiation source device (hereinafter, referred to as a radiation source device) 21 to which a radiation source is attached. 1 and 2 are schematic diagrams of the photographing device 20. FIG. The imaging device 20 includes a moving carriage 6, an imaging plate 7, an imaging plate support 1, a holder 5, a cable 2, a rotation motor 8, a small motor 3, a pinion 4, a CCD camera 9, and a monitor 1.
0, a control device 11, and a motor 16 for driving the moving carriage 6. The cable 2 is connected to a control device 11, and an operator can remotely control the photographing device 20 using the control device 11. The cable 2 is also connected to the monitor 10, and the monitor 1
At 0, it is possible to see the vicinity of the inspection target. as a result,
Even if the worker does not go to the vicinity of the inspection target, the inspection device can be installed at an accurate position. The imaging plate support 1 is connected to a moving cart 6 and a rotation motor 8. The rotation motor 8 rotates the imaging plate support 1 by remote control through the cable 2.
The holder 5 is provided on the upper surface of the imaging plate 7, and the holder 5 is prevented from falling off by the pressers 22 on both sides of the upper surface of the imaging plate support 1. Holder 5
A pinion 4 and a rack 15 are provided on the lower surface of the. The pinion 4 and the rack 15 are engaged. The pinion 4 provided on the imaging plate support 1 is attached to the shaft of the small motor 3. By rotating the small motor 3, the pinion 4 rotates, and the imaging plate support 1 is moved with respect to the moving direction of the moving carriage 6. Can be moved at right angles. Holder 5 is a rectangular frame,
It is possible to insert the imaging plate 7 into the frame. An opening / closing section 23 provided at one end of the holder 5
Is openably and closably attached to the holder 5 (FIG. 1).
2). By opening the opening / closing section 23, the imaging plate 7 can be easily replaced. An image is displayed on a monitor 10 through the cable 2 by a CCD camera 9 attached to the side of the moving carriage 6.

The radiation source device 21 includes a moving carriage 6, a source transmission tube 12, a source cable 13, a CCD camera 9, a monitor 10, a control device 11, a cable 2, a motor 16 for driving the moving carriage 6A, a wire, and the like. It comprises a motor 17 for moving the source transmission tube 12. Cable 2 is control device 1
1, the worker can remotely control the mobile trolley 6 by operating the motor 16 for driving the mobile trolley with the control device 11. The source transmission tube 12 expands and contracts when the control device 11 operates the motor 17 for moving the source transmission tube 12. The source transmission tube 12 is attached to the lower surface of the moving carriage 6,
The radiation source can be sent to an appropriate position by the transmission of the source cable 13 in the source transmission tube 12. In addition, the source transmission tube 1
By using 2, the source cable 13 attached to the radiation source can be sent to the measurement position without bending.

The method of installing the photographing device 20 and the radiation source device 21 is as follows. For example, consider a case in which an elbow of a feeder tube of a CANDU furnace is inspected. FIG. 7 shows CAND
A state where the feeder tube 24 of the U furnace is inspected using the piping inspection device of the present embodiment is shown. 8 and 9 show a procedure for installing the piping inspection device. First, the photographing device 20 is installed on the upper surface of the traveling rail 25 (FIG. 8A). The holder 5 is in a folded state (a state in which it is brought close to the rotation motor 8).
The imaging plate support 1 is rotated so that the imaging plate 7 is on the opposite side to the feeder tube 24 (FIG. 8A). In such a state, even if an obstacle exists in the lateral direction of the inspection target, the imaging device 20 can be moved to the inspection location without any problem. While monitoring the image from the CCD camera 9 on the monitor 10,
Is moved along the travel rail 25 by remote control by the control device 11. After moving to the predetermined position,
The moving carriage 6 is stopped. The rotation motor 8 is operated to rotate the imaging plate 7 to the inspection object side (FIG. 8).
(b)). By moving the small motor 3 and rotating the pinion 4, the imaging plate 7 is moved to the upper part of the inspection object (FIG. 8C).

Next, an operation method of the radiation source device 21 will be described. The radiation source device 21 is installed at the lower surface end of the traveling rail 25 (FIG. 8A). A CCD camera 9 is installed on the moving trolley 6A, and while monitoring the image on the monitor 10, the radiation source device 2 is moved to an appropriate position along the traveling rail 25.
The first moving cart 6A is moved. After the movement, the motor 17 for moving the source transmission tube 12 is operated to extend the source transmission tube 12 and move it to the position of the feeder tube 24 of the inspection target (FIG. 9A). After the source transmission tube 12 reaches a predetermined position, the movement of the source transmission tube 12 is stopped, and the source cable 13 is moved to position the radiation source 26 below the feeder tube 24 to be inspected. Let it.
The radiation emitted from the radiation source is applied to the feeder tube 24. For example, when inspecting the feeder tube 24 of the CANDU furnace, the radiation emitted from the radiation source 26 below the feeder tube 24 passes through the feeder tube 24 and reaches the imaging plate 7 located above the feeder tube 24. . Since the transmittance of radiation varies depending on the material, a transmission image of the feeder tube 24 is displayed on the imaging plate 7. Since the radiation source 26 and the imaging plate 7 are sufficiently separated, a good transmission image can be obtained.

The feeder tubes 24 of the CANDU furnace are lined up in the direction of the horizontal axis of the diameter, and it is necessary to carry out photographing many times. In addition, it is necessary to replace the imaging plate 7 each time (FIG. 9B). Imaging plate 7
Will be described with reference to FIGS. 10, 11 and 12. FIG. After the end of imaging using the radiation source for one inspection object shown in FIG. 9A, the small motor 3 is moved to return the imaging plate 7 to the moving carriage 6 (FIG. 10).
(a)). Then, by driving the rotation motor 8, the imaging plate support 1 is rotated to face the side opposite to the inspection object (FIG. 10B). The imaging plate support 1 is further taken out while sliding the holder 5. Thereafter, the opening / closing section 23 of the holder 5 is opened (FIG. 12).
(a)). In this state, the imaging plate 7 is taken out of the holder 5 (FIG. 12B). Next, a new imaging plate 7 is mounted in the holder 5 (FIG. 1).
1 (a)). Details of this operation will be described with reference to FIGS. 12 (c) and 12 (d). With the opening / closing part 23 opened, a new imaging plate 7 is inserted into the holder 5 (FIG. 12C). After the new imaging plate 7 is inserted, the opening / closing section 23 is closed (FIG. 12D). The new imaging plate 7 is
, So that it does not come off the holder 5. The holder 5 on which the new imaging plate 7 is mounted is moved to the imaging plate support 1 side while sliding by the reverse operation of FIG. next,
As shown in FIG. 11B, by driving the rotation motor 8, the imaging plate support 1 is rotated toward the inspection object, and the imaging plate 7 is oriented toward the inspection object. Then, the small motor 3 is moved to move the imaging plate 7 to the inspection object side. In this state, as shown in FIG. 8, the carriages 6 and 6A are moved to move the imaging device 20 and the radiation source device 21 to the position of the feeder tube 24 to be inspected next.
Hereinafter, the operations of FIGS. 8, 9, 10 and 11 are repeated to photograph different feeder tubes 24 one after another.

After the inspection is completed, the radiation source device 21 takes out the radiation source cable 13 from the radiation source transmission pipe 12, moves it to the place where it was originally located, and collects it. Further, the photographing device 20 operates the small motor 3 to return the imaging plate 7 to the rotation motor 8 side, and moves the rotation motor 8 to rotate the imaging plate support 1 to the side opposite to the inspection object. Move to location and collect.

[0013]

According to the present invention, it is possible to simplify the work of exchanging the film in the inspection of the piping and to shorten the time required for the inspection.

[Brief description of the drawings]

FIG. 1 is a side view of a photographing device of a piping inspection device according to a preferred embodiment of the present invention.

FIG. 2 is a plan view of the photographing apparatus.

FIG. 3 is a plan view of an imaging plate in the imaging device of FIG. 1;

FIG. 4 is a side view of the imaging plate.

FIG. 5 is a side view of the radiation source device of the piping inspection device of FIG. 1;

FIG. 6 is a plan view of the radiation source device.

FIG. 7 shows a pipe inspection device shown in FIGS.
It is explanatory drawing at the time of installing in a furnace.

FIGS. 8A and 8B are explanatory diagrams of a procedure for installing the pipe inspection device near an inspection target, wherein FIG. 8A is a diagram illustrating a moving state of the pipe inspection device, and FIG. 8B is an explanatory diagram illustrating a rotation operation of the imaging plate support; (C) is an explanatory view showing an operation of extending the imaging plate to the inspection object side.

FIGS. 9A and 9B are explanatory diagrams illustrating photographing of the inspection object by the pipe inspection device, wherein FIG. 9A is an explanatory diagram illustrating a photographing state of the inspection object, and FIG. 9B is an explanatory diagram illustrating extraction of the imaging plate.

FIGS. 10A and 10B are explanatory diagrams showing a part of the procedure for replacing the imaging plate, wherein FIG. 10A is a diagram showing a moving state of the imaging plate after photographing, FIG. 10B is an explanatory diagram showing a rotating operation of the imaging plate, (c) is an explanatory view showing a state in which the imaging plate is removed.

FIGS. 11A and 11B are explanatory diagrams showing the rest of the procedure for replacing the imaging plate, and FIG. 11A is an explanatory diagram showing a state of movement of the imaging plate after the replacement of the imaging plate;
(b) is an explanatory view showing a state in which the imaging plate is moved to the inspection object side.

FIGS. 12A and 12B are explanatory diagrams showing each procedure of removing an imaging plate from a holder and attaching the same to the holder, wherein FIG. 12A is a diagram showing an open state of an opening / closing unit, and FIG. FIG. 9C is an explanatory view showing a state of replacing the imaging plate, and FIG. 9D is an explanatory view showing a state at the end of the replacement of the imaging plate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Imaging plate support, 2 ... Cable, 3 ... Small motor, 4 ... Pinion, 5 ... Holder, 6,6A ... Transfer cart, 7 ... Imaging plate, 8 ... Rotating motor, 9 ... CCD camera, 10 ... Monitor , 11: control device, 12: source transmission tube, 13: source cable, 14, 1
4A: wheels, 15: rack, 16, 17: motor, 20
... Photographing device, 21 ... Source device, 24 ... Feeder tube, 2
5. Running rail.

Claims (2)

[Claims] An imaging plate support that can be rotated, an imaging plate support, a mobile trolley having a source transmission tube, wheels, and a camera, and a control device that operates the mobile trolley and the imaging plate support When,
A pipe inspection device equipped with a monitor that displays images sent from the camera. 2. An imaging plate support is rotated after imaging of an inspection object using radiation, and an imaging plate attached to the imaging plate support is rotated.
A piping inspection method that removes from the imaging plate support, replaces it with a new imaging plate, and uses this new imaging plate to perform radiation imaging of other inspection objects.