JPH03189543A - Inspection device for internal surface of small-diameter tube - Google Patents

Abstract

PURPOSE:To inspect the internal surface of the small-diameter tube remotely and automatically by a visual test and an eddy current flaw detection test by fitting a small-sized television camera and an eddy current flaw detection coil to the same flaw detection head and thus constituting an integrated flaw detection head, and arranging the eddy current flaw detection coil in the visual field of the camera. CONSTITUTION:The small-sized television camera 6 and eddy current flaw detection coil 7 are fitted to the same flaw detection head 8. The flaw detection head 8 inspects the internal surface of a neutron flux detector housing 3 by the visual test and eddy current flaw detection test at the same time. Further, the flaw detection head 8 is coupled with a driving device 10 through a rod 9 and the driving device 10 is controlled by a controller 12 to inspect the internal surface of the neutron flux detector housing 8 remotely and automatically. Further, a position signal is inputted from the controller 12 to an eddy current flaw detection recording device 15 connected to an eddy current flaw detector 14 to generate eddy current flaw detection records including inspection position information.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device that remotely and automatically inspects and records the inner surface of a small diameter pipe, and in particular, a device that simultaneously performs a visual test and an eddy current flaw detection test. The present invention relates to a small diameter pipe inner surface inspection device suitable for recording.

[Conventional technology]

Conventional equipment is designed to perform an eddy current flaw detection test on the inner surface of a steel pipe, as described in Japanese Unexamined Patent Publication No. 60-190851.

However, no consideration was given to conducting visual tests and eddy current testing at the same time.

[Problem to be solved by the invention]

The above-mentioned prior art does not take into consideration the fact that the inner surface of a small diameter pipe is inspected simultaneously by a target test and an eddy current flaw detection test.

Target testing alone makes it easy to detect defects with large openings on the inner surface and abnormalities such as discolored areas, but it has the disadvantage that it is difficult to detect defects with small openings on the inner surface, and defects on the surface cannot be detected. In addition, in eddy current testing alone,
Defects in the surface layer that do not have openings on the inner surface can be detected, but defects that are small in depth are difficult to detect even if there are large openings on the inner surface, and abnormalities such as discolored areas cannot be detected.

The purpose of the present invention is to simultaneously inspect the inner surface of a small-diameter pipe using a visual test and an eddy current flaw detection test, and to simultaneously detect defects such as defects in the inner surface, defects in the surface layer, and discolored areas, and to simultaneously inspect the inner surface of a small diameter pipe using a visual test and an eddy current flaw detection test. The aim is to make it easier to respond.

[Means to solve the problem]

The above object is achieved by attaching a small television camera and an eddy current flaw detection coil to the same flaw detection head, forming an integrated flaw detection head, and arranging the eddy current flaw detection coil within the field of view of the camera.

[Effect]

A small television camera and an eddy current flaw detection coil are attached to the same flaw detection head and connected to a drive device via a rod. The flaw detection head and rod are inserted into a small diameter pipe and driven by a drive device. As a result, the inner surface of the small-diameter pipe can be inspected remotely and automatically by visual testing and eddy current testing at the same time, and the eddy current testing part and the visual testing part can be easily matched.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

There is a build-up weld 2 on the inner surface of the reactor pressure vessel lower mirror 1, and a weld 4 for attaching the neutron flux detector housing 3 to the reactor pressure vessel lower mirror 1 via the build-up weld 2.

There is a housing flange 5 at the lower end of the neutron flux detector housing 3, and this is the product to be inspected.

/, a b-type television camera 6 and an eddy current flaw detection coil 7 are attached to the same flaw detection head 8, and are connected to the drive device 1 via a rod 9.
Connected to 0. The flange 11 is for fixing the drive device 10 to the housing flange 5.

A control device 12 for controlling the drive device 10 is connected by a drive cable 13 , and an eddy current flaw detection recording device 15 connected to an eddy current flaw detector 14 receives signals from the eddy current flaw detection coil 7 transmitted via an eddy current flaw detection cable 16 . Record the signal. The video recording device 17 records the video of the small television camera 6 transmitted via the camera cable 18. Further, a position signal is transmitted from the control device 12 to the eddy current flaw detection and recording device 15 via a position signal cable 19.

According to this embodiment, the inner surface of the neutron flux detector housing 3 can be simultaneously inspected by a visual test and an eddy current test using the flaw detection head 8 to which the small television camera 6 and the eddy current flaw detection coil 7 are attached.

Furthermore, by connecting the flaw detection head 8 to the drive device 10 via the rod 9 and controlling the drive device 10 by the control device 12, the inner surface of the neutron flux detector housing 3 can be inspected remotely and automatically. .

Furthermore, by inputting a position signal from the control device 12 to the eddy current flaw detection recorder 15 connected to the eddy current flaw detector 14, an eddy current flaw detection record incorporating one-inspection position information can be created.

〔Effect of the invention〕

According to the present invention, the inner surface of a small diameter pipe can be inspected remotely and automatically using a visual test and an eddy current flaw detection test at the same time, so defects that are difficult to detect or cannot be detected when each test method is performed independently can be detected. There is an effect that defects can be compensated for and detected by any of the tests, and abnormalities such as defects and discolored parts in the surface layer of the defect 2 opened on the inner surface can be detected. Furthermore, eddy current testing alone can detect irregularities on the inner surface of small diameter pipes.
Alternatively, there is a risk that a signal generated by metal deposits may be interpreted as a defect signal, and it is necessary to re-evaluate whether it is a significant defect or a spurious signal by a visual test after the inspection is completed. Therefore, according to the invention:
These can be evaluated simultaneously, which has the effect of shortening inspection time and preventing erroneous judgments.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

Claims (1)

[Scope of Claims] 1. A device for remotely and automatically inspecting the inner surface of a small-diameter pipe consisting of a flaw detection head, a rod, and a drive device, wherein a small television camera and an eddy current flaw detection coil are incorporated into the flaw detection head to provide an integrated flaw detection system. A small-diameter pipe inner surface inspection device featuring a head.