JPH07280783A - Piping inspecting apparatus - Google Patents

Abstract

PURPOSE:To provide a piping inspecting apparatus to automatically inspect welded joints in any direction. CONSTITUTION:A plurality of first gear-type rails 8 put along a piping 15 to be inspected at a prescribed gap from the surface of the piping 15 to be inspected are installed, second gear-type rails 2 are installed in the insides of the gear-type rails 8 along the circumferentail direction of the pipeline to be inspected, and an axial direction sending system 9 which runs on the gear- type rails 8 attached to said gear-type rails and a circumferential direction sending system 3 which has a probe for inspection and runs on the gear-type rails 2 are also installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe inspection device used for in-service inspection (ISI) of primary system pipes of a nuclear power plant.

[0002]

2. Description of the Related Art In the conventional primary system piping of a nuclear power plant, since it was not necessary to use a longitudinal joint for the piping, an automatic flaw detection for the peripheral joint was exclusively performed for in-service inspection (ISI) of the piping. The reality is that the device has been developed.

As shown in FIG. 4, the automatic flaw detector has a fixed position of the circumferential guide rail 1 so that the probe 11 on the circumferential weld line 13 of the pipe 15 to be inspected can take an appropriate position. And fix it. After the circumferential gear type rail is set on it, the circumferential feed mechanism 3 is mounted on it. A probe 11 is attached to the circumferential feed mechanism 3 via a holding mechanism 12. Circumferential feeding mechanism 3
The DC motor 5 located in the forward direction rotates forward and backward, the circumferential feed mechanism 3 moves on the gear type rail, and the probe 11 causes the welding line 1 to move.
Three parts are inspected.

[0004]

The primary system equipment of a nuclear power plant is obliged to carry out a non-destructive inspection of welds on a regular basis. Further, since it is difficult for an inspector to approach the equipment or the like for a long time due to radiation peculiar to a nuclear power plant, automation of inspection is being promoted.

Under these circumstances, regular inspection and in-service inspection (ISI) must also be performed on the primary system piping. There was no product, and I relied on using existing seamless tubes. However, in the case of the primary system piping of the high temperature gas furnace, there is a piping manufactured by bending the plate material due to its structure, so that a longitudinal joint is inevitably generated. Therefore, it is necessary to develop a pipe inspection device that can automatically detect flaws not only for circumferential joints but also for longitudinal joints. It is legally possible to improve the workability of inspectors and reduce the radiation exposure dose. There was also the humanitarian aspect of reducing it.

[0006]

The present invention takes the following means in order to solve the above problems.

That is, as a pipe inspection device, a plurality of first gear type rail means arranged along the pipe to be inspected at a predetermined distance from the surface thereof, and along the circumferential direction of the pipe to be inspected and the gears. Second gear-type rail means disposed inside the mold-rail means, axial feed means mounted on the second gear-type rail means and traveling on the first gear-type rail means, and for inspection The second with the probe
And a circumferential feed means for traveling on the gear type rail means.

[0008]

In the above means, for example, the case of inspecting the welded portion of the pipe to be inspected having the weld line along the pipe direction and the weld line along the circumferential direction of the pipe will be described.

The above-described pipe inspection device is set at the weld line portion of the pipe to be inspected. Then, when inspecting the weld line portion in the piping direction (axial direction), the circumferential feed means operates, moves on the second gear type rail means, and the probe for inspection comes on the weld line. The axial feed means is then actuated to move on the first gear type rail means. Then, the second gear type rail means and the probe move in the axial direction. During this process, the probe inspects the weld line in the axial direction.

When inspecting the weld line portion in the circumferential direction, the axial feed means is operated, the second gear type rail means moves on the first gear type rail means, and the inspection probe is operated. Come on the welding line. Next, the circumferential feed means is activated to move on the second gear type rail means. In this process, the probe inspects the weld line portion in the circumferential direction.

In this way, various weld line portions of the pipe to be inspected are automatically inspected.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention described above will be described with reference to FIGS. It should be noted that the parts described in the conventional example are denoted by the same reference numerals and the description thereof is omitted, and the parts relating to the present invention will be mainly described.

In FIG. 1, the pipe to be inspected (curved pipe) 15 has a circumferential joint (welding line in the circumferential direction) 13 and a longitudinal joint (welding line in the piping direction) 14. To some extent of these,
Two first gear type rails 8 are arranged along the pipe 15 and at a predetermined distance from the surface of the pipe 15. As shown in FIGS. 2 and 3, the gear type rail 8 has a gear a along the center of the pipe 15 side (lower side), and has a cross section of a c type b having an upper brim. Both ends of these gear type rails 8 are fixed on the pipe 15 by a mounting device 7 having a suction mechanism by an air ejector.

The second gear type rail 2 is arranged along the circumferential direction of the pipe 15 and inside the first gear type rail 8. The gear type rail 8 has a gear c along the center of the pipe 15 side (lower side), and has grooves d on both upper sides. The second gear type rail 2 is mounted on the first gear type rail 8 via an axial feed mechanism 9. The casing of the axial feed mechanism 9 is a box type whose surface on the first gear type rail 8 side is open, and the inner surface cross section on the open side is a claw b, and the claw b surface of the gear type rail 8 is It can mate with and can slide. Further, a gear 20 that meshes with the gear a is arranged in the casing of the feed mechanism 9, and the gear 20 is connected by a DC motor 25 via another gear.

A circumferential feed mechanism 3 having a probe 11 is arranged on the second gear type rail 2. The casing of the feed mechanism 3 is a stepped box type, and the first gear type rail 8 side is open to form an angle type. The angle portion is formed with a protrusion along the rail 2 that can be fitted into the groove d of the second gear type rail 2 and can slide. Further, a gear 4 that meshes with the gear c is arranged in the casing of the feed mechanism 3, and the gear 4 is connected by a DC motor 5 via another gear.

In the above, when inspecting the welding line 14 in the axial direction, the DC motor 5 of the circumferential feed mechanism 3 operates. Then, the gear 4 rotates, the circumferential feed mechanism 3 moves on the second gear type rail 2, and stops when the probe 11 comes on the welding line 14.

Next, the DC motor 25 of the axial feed mechanism 9 operates. Then, the gear 20 rotates and the axial feed mechanism 9 moves on the first gear type rail 8. Then, the second gear type rail 2 and the probe 11 move in the axial direction. In this process, the probe 11 inspects the axial weld line 14 for flaw detection.

When inspecting the weld line 13 in the circumferential direction, the axial feed mechanism 9 is operated and the second gear type rail 2 is moved to the first position.
The probe 11 for inspection comes on the welding line 13 by moving on the gear type rail 8 of. Next, the circumferential feed mechanism 3 operates to move on the second gear type rail 2. In this process, the probe 11 inspects the circumferential weld line 13 for flaw detection.

In this way, the various welding lines 13 and 14 of the pipe 15 to be inspected are automatically inspected by remote control. Therefore, it is possible to reduce the radiation exposure amount and improve workability.

Although only the inspection of the welding line in the circumferential direction and the welding line in the axial direction has been described above, the inspection of the welding line in the oblique direction is possible by combining both operations.

[0021]

As described above, according to the present invention, not only the inspection of the joints in the circumferential direction and the axial direction of the pipe to be inspected, but also the inspection of the joints in other directions can be performed automatically and easily. Be seen.

[Brief description of drawings]

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

FIG. 2 is a sectional view of an axial and circumferential feed mechanism portion of the same embodiment.

FIG. 3 is a view taken along the line AA of FIG. 2 of the same embodiment.

FIG. 4 is a perspective view of the entire configuration of a conventional example.

[Explanation of symbols]

 2 circumferential gear type rail 3 circumferential feeding mechanism 4, 20 gear 5, 25 DC motor 7 mounting device 8 axial gear type rail 9 axial feeding mechanism 11 probe 12 probe holding mechanism 13 circumferential welding line 14 Longitudinal welding line 15 Pipe to be inspected

Claims (1)

[Claims] 1. A plurality of first gear type rail means arranged along the pipe to be inspected at a predetermined distance from the surface thereof, and along the circumferential direction of the pipe to be inspected and inside the gear type rail means. The second gear type rail means, the axial feed means mounted on the second gear type rail means and traveling on the first gear type rail means, and the inspection probe. A pipe inspection device, comprising: a circumferential feed means that travels on the second gear-type rail means.