JPS6253771B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic probe used for flaw detection of pipe welds and the like.

Conventionally, an ultrasonic probe using an ultrasonic transducer has been used to detect defects in pipe welds. This conventional ultrasonic probe had one transducer and could only transmit ultrasonic waves at a predetermined angle.

This is because conventionally, most ultrasonic probes for manual flaw detection have been of the single-probe type, and ultrasonic flaw detectors have also been of the single-channel type, so there was no particular need for multiple probes.

On the other hand, the multi-probe method was adopted early on for automatic flaw detection of steel plates, rails, etc., but this method involved lining up many probes and flaw detectors.

Therefore, flaw detection for the primary cooling system piping of existing nuclear power plants is carried out at three angles: vertical (0 degrees), 45 degrees, and 60 degrees.
It is done manually using separate, separate contacts. In recent years, semi-automation of inspections has been promoted in order to reduce the radiation exposure of inspectors, but scanning each probe one by one with separate probes results in a large amount of radiation exposure, and it is difficult to further reduce radiation exposure. is desired.

Furthermore, in inspections using ultrasonic probes in other technical fields, there is a desire to develop an ultrasonic probe that can quickly perform inspections at different refraction angles in order to improve work efficiency.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ultrasonic probe that can quickly perform ultrasonic inspections at different refraction angles and reduce radiation exposure of inspectors, for example, in nuclear power related inspections.

In the present invention, a plurality of transducers attached to a shoe are arranged in pairs with a sound insulating material in between, and are arranged along the sound insulating material so that the radiation angles of the respective ultrasonic beams are different. This aims to achieve the above object by making it possible to perform flaw detection using a plurality of beams at different angles.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

A sound insulating material 2 is provided on the inner wall of a cubic box-shaped case 1 with an open bottom surface, and two shoes 4 and 5 separated by a sound insulating material 3 are installed inside the case 1 with their tops opened on the bottom open side. It is installed in the inserted state. On top of these shoes 4 and 5, 0-degree vibrators 6 and 7, 45-degree vibrators 8 and 9, and 60-degree vibrators 10 and 11 are installed, respectively. , 7, 45-degree transducers 8, 9 and 60-degree transducers 10, 11, as shown in FIG. 13 and an ultrasonic beam 14 with a refraction angle of 60 degrees can be transmitted or received. At this time, if the transducers 6, 8, and 10 attached to one shoe 4 are used as wave transmitters, the transducers 7, 9, and 11 attached to the other shoe 5 are used as wave receivers.

An opening 15 is formed in the upper surface of the case 1, and a lid 16 for closing the opening 15 is attached. In addition, cable 17 is included in case 1.
One end of this has been introduced. Further, on the lower surfaces of the two shoes 4 and 5, there are ring adapter shoes 19 and 20 which are partitioned at the center corresponding to the sound insulation material 3 by a sound insulation material 18 and which are combined with each other to have a substantially rectangular plane. 21 and can be attached and detached, or are fixed by adhesive or the like as required. These adapter shoes 19 and 20 are processed according to the shape of the subject to maintain good contact, and when it is necessary to reduce the contact area, the minimum area necessary for contact is , and remove the others by grinding. Alternatively, the shoes 4 and 5 may be brought into direct contact with the subject without using the adapter shoes 19 and 20.

Incidentally, the incident point of each of the ultrasonic beams 12, 13, 14 is set near 0 degrees, and these three ultrasonic beams 12, 13, 14 are
The oscillators 6 to 11 are attached to the shoes 4 and 5 so as to be inserted into the same quadrant in the two-dimensional plane of the -Y coordinate.

In such a configuration, in order to perform flaw detection on the object, sufficient time intervals are taken, first flaw detection is performed at 0 degrees, then flaw detection is performed at 45 degrees, and finally flaw detection is performed at 60 degrees. In the next cycle, flaw detection is performed sequentially at 0 degrees, 45 degrees, and 60 degrees, and this is repeated to continue the inspection.

According to this embodiment as described above, three ultrasonic beams 12 to 14 having different refraction angles can be transmitted by one ultrasonic probe, and three ultrasonic beams 12 to 14 having different refraction angles can be transmitted. The ultrasonic beams 12 to 14 are
Because they are made to exist within the same cross section,
An image can be displayed by directly superimposing the signals of each beam 12 to 14, and a cross-sectional image can be formed in real time. In particular, the 0 degree beam 12 is effective for displaying the shape of the bottom surface and the outline of the subject. Also,
Since inspection time can be shortened compared to conventional methods, work efficiency is improved, and when used for nuclear power related work,
The amount of radiation exposure for inspectors can be reduced.

In the above example, the incident points of the three ultrasonic beams were set near the 0 degree beam, but in order to minimize the contact area of the probe, the incident points of the three beams were set at the same point. It is better to keep it at one point. However, in practice, it is not always necessary to make all points the same, and 0
The contact area can also be reduced by making the angle and 45 degrees the same point, or by making the angle 45 and 60 degrees the same point, and these are also included in the present invention.
Further, in the above embodiment, the refraction angle is 0 degree, 45
Although the angle is set at 60 degrees, it is not necessarily limited to this, and the angle may be changed and set as necessary. may be set. In short, the shoe of the present invention only needs to have a plurality of transducers and be configured to be able to send out ultrasound beams with different refraction angles.

As described above, the present invention has the effect of providing an ultrasonic probe that can efficiently test a subject.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view showing an embodiment of an ultrasonic probe according to the present invention, FIG. 2 is a cross-sectional view taken along the - line in FIG. 1, and FIG. 4 is a plan view of the adapter shoe used in the embodiment shown in FIG. 1, and FIG. 5 is a side view taken along the line - in FIG. 4. 1...Case, 4, 5...Show, 6-11...
...Vibrator, 12-14...Ultrasonic beam.

Claims (1)

[Scope of Claims] 1. An ultrasonic probe in which a transducer is attached to a shoe and the ultrasonic beam from the transducer detects flaws in a measured object, wherein the plurality of transducers attached to the shoe are covered with sound insulating material. An ultrasonic probe characterized in that the ultrasonic probes are arranged in pairs separated from each other and arranged along the sound insulating material so that the radiation angles of the respective ultrasonic beams are different. 2. In accordance with the first claim, a plurality of shoes are provided with a sound insulating material in between, and a plurality of vibrators are arranged in each shoe along the sound insulating material at different angles. An ultrasonic probe characterized by: 3 In claim 1 or 2, the installation angle of the vibrator is such that the refraction angle is 0 degrees, 45 degrees, or 60 degrees.
An ultrasonic probe characterized by an angular stop. 4. In claim 3, the ultrasonic wave is characterized in that each vibrator is arranged in the following order from the top: a vibrator with a refraction angle of 0 degrees, a vibrator with a refraction angle of 45 degrees, and a vibrator with a refraction angle of 60 degrees. probe.