JPH10239285A - Ultrasonic flaw detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute an ultrasonic flaw detection at a plurality of spots simply by mounting a plurality of ultrasonic probes to a band-shaped object that can be wound around the outer periphery of a piping with a gap in the longitudinal and peripheral directions of the piping. SOLUTION: A band-shaped object 6 where a plurality of ultrasonic probes 4 are mounted to a piping 1 with a specific gap in a longitudinal direction 16 and in a periphery direction 18 of the piping 1 is wound to the outer periphery of the piping 1 with the ultrasonic probes 4 inside. In this state, a gas such as air is sent to the internal part of the sealed bag-body like band-shaped object 6 from a gas injection port 12 via a gas tube 14 and a valve 15 by using a gas injection port 13 such as bellows to inflate the band-shaped object 6, thus pressing each ultrasonic probe 4 to the outer periphery of the piping 1. Then, an insertion plug 24 that extends from an ultrasonic measurement device main body 5 is successively inserted into a data integration machine 22, each ultrasonic probe 4 is connected to the ultrasonic measurement device main body 5 successively, each ultrasonic probe 4 executes ultrasonic flaw detection in order, and obtained data are analyzed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic flaw detector, and more particularly, to an ultrasonic flaw detector capable of easily performing ultrasonic flaw detection at a plurality of locations.

[0002]

2. Description of the Related Art For example, a large number of pipes are generally provided in various plants and the like, but it is important to know the degree of deterioration of the pipes due to the necessity of maintenance of the plants. In order to check the degree of deterioration of the pipe over time, a pipe wall thinning survey and the like have been conventionally performed.

As shown in FIG. 4, the above-mentioned thinning investigation is first set by marking a large number of measurement points 3 on a thinning investigation position 2 of a pipe 1. Next, the surface of each of the marked measurement points 3 is polished, and the ultrasonic probe 4 is applied to each of the measurement points 3 whose surface has been polished, so that ultrasonic inspection is performed one by one.

In the figure, reference numeral 5 denotes an ultrasonic measuring instrument main body to which the ultrasonic probe 4 is connected.

[0005]

However, as described above, there is the following problem in the method of ultrasonically testing each measurement point 3 one by one.

In other words, the measurement point 3 is set at several hundred positions with respect to one thinning inspection position 2 of the pipe 1 in some cases. The work of transferring the ultrasonic probe 4 and the like was difficult and took a long time.

[0007] In addition, for the above-mentioned thinning investigation, it is necessary to set a measurement point 3 on the entire circumference of the pipe 1 and perform ultrasonic flaw detection. A relatively large-scale research scaffold must be assembled so that work can be performed in a face-to-face state, but in practice, it is often not possible to secure the space for the large-scale investigation scaffold as described above. There were many places where it was not possible to physically conduct a wall-thinning survey.

The present invention has been made in view of the above circumstances, and has as its object to provide an ultrasonic inspection apparatus capable of easily performing ultrasonic inspection at a plurality of locations.

[0009]

According to the present invention, a plurality of ultrasonic probes are provided on a strip 6 which can be wound around the outer periphery of a pipe 1 at a predetermined interval in a longitudinal direction 16 and a circumferential direction 18 of the pipe 1. 4. An ultrasonic flaw detector according to claim 4, wherein

[0010] In this case, the belt-shaped material 6 may be constituted by a closed bag which can be inflated by gas.

Further, the bonding position of the overlapping portion on both sides of the strip 6 can be adjusted according to the diameter of the pipe 1 so as to be adjusted.
The simple bonding means 7 to 9 may be attached to a plurality of locations.

According to the above means, the following effects can be obtained.

By winding the band 6 around the outer periphery of the pipe 1, the band 6 is placed in the longitudinal direction 16 of the pipe 1.
In addition, a plurality of ultrasonic probes 4 attached at required intervals in the circumferential direction 18 can be simultaneously arranged. This makes it possible to easily perform ultrasonic flaw detection at many locations.

By forming the band 6 in a closed bag and inflating the band 6 with gas, the plurality of ultrasonic probes 4 can be securely brought into close contact with the pipe 1.

Further, at the overlapping portion on both sides of the strip 6 wound around the outer circumference of the pipe 1, by selecting any one of the simple bonding means 7 to 9, the bonding of the strip 6 according to the diameter of the pipe 1 is performed. The position can be adjusted. Thereby, it is possible to cope with the pipes 1 having different pipe diameters with the single band-shaped object 6.

[0016]

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

1 to 3 show an embodiment of the present invention.

In the present invention, a strip 6 that can be wound around the outer circumference of the pipe 1 is provided, and simple bonding means 7 to 9 such as a velcro tape are attached to overlapping portions on both sides of the strip 6.

Simple bonding means 7 to 9 such as magic tape
By attaching one male or female side to one overlapping part, one female or male side to the other overlapping part, and one or several female or male sides near it, To be able to respond to changes in pipe diameter.

The belt-like material 6 is formed by using a hermetically sealed bag formed by laminating two resin sheets 10 and 11 and heat-sealing the outer edges thereof. A gas container 13 such as a strawberry is connected to the formed gas injection port 12 so that a structure such that air or the like is supplied to the inside to expand the structure is provided. Reference numeral 14 denotes a gas tube connecting between the gas inlet 12 and a gas container 13 such as a strawberry, and 15 denotes a valve provided in the gas tube 14.

Then, as shown in FIG. 3, an attachment member 17 extending in the longitudinal direction 16 of the pipe 1 is attached to the strip 6.
A plurality of ultrasonic probes 4 are provided at predetermined intervals in the longitudinal direction 16 of the pipe 1 on each of the mounting members 17 at predetermined intervals in the circumferential direction 18 of the pipe 1.

The attachment member 17 may be attached so as to be attached to the outer surface of the resin sheet 10 which becomes the inside when the strip 6 is wound around the pipe 1, but as shown in FIG. It is preferable to be accommodated inside in terms of handling.

When the mounting member 17 is housed inside the band 6, the portion around the mounting member 17 in the band 6 is heat-sealed so that the mounting member 17 does not move with respect to the band 6. The position of the mounting member 17 is fixed by bonding with a (heat sealing portion 19) or the like. Then, the communication path 20 and the like are appropriately formed by heat sealing or the like so that the heat-sealed portion does not become a closed section.
Alternatively, the gas can be distributed to the portion surrounding the mounting member 17 by at least a heat seal. Further, the contact surface of the ultrasonic probe 4 is made to come out of the belt-like material 6 to the outside.

Then, the signal line 21 extending from each ultrasonic probe 4 is taken out from the strip 6 and connected to the data accumulator 22, and connected to each ultrasonic probe 4 provided on the data accumulator 22. An insertion plug 24 extending from the ultrasonic measuring device main body 5 can be inserted into the corresponding insertion port 23.

Next, the operation will be described.

In the present invention, when a thinning investigation is performed on the pipe 1, first, a required area of the thinning investigation position 2 to be investigated is first entirely polished with a grinder or the like. Spray grease evenly on the surface polished part.

A plurality of ultrasonic probes 4 are attached at predetermined intervals in the longitudinal direction 16 and the circumferential direction 18 of the pipe 1, and the strip 6 is sprayed with the ultrasonic probes 4 inside. Is wound around the outer circumference of the pipe 1 on which the belt 6 is sprayed, and is fastened by using a simple adhesive means 7 to 9 such as a magic tape attached to an overlapping portion on both sides of the strip 6.

At this time, the simple bonding means 7 to 9 such as a magic tape are provided at one location on the male side or the female side at one overlapping portion, and at one location at the female or male side at the other overlapping portion and in the vicinity thereof. The female side or the male side is attached to one or several places, so that the simple bonding means 7 and 8 to be attached, or
By selecting 7 and 9, one strip 6 can respond to a change in the pipe diameter.

In this state, a gas such as air is fed from the gas inlet 12 through the gas tube 14 and the valve 15 to the inside of the closed bag-shaped band 6 by using the gas container 13 such as strawberry. Then, the strip 6 is expanded.

Then, each ultrasonic probe 4 is pressed against the outer periphery of the pipe 1 due to the expansion of the band-like material 6, and the ultrasonic probe 4 is pressed against the pipe 1 by spray grease or the like sprayed on the pipe 1. You.

Finally, provided in the data integrator 22
By inserting insertion plugs 24 extending from the ultrasonic measuring device main body 5 in sequence into the insertion ports 23 corresponding to the respective ultrasonic probes 4, each ultrasonic probe 4 and the ultrasonic measuring device main body 5 are inserted.
Are sequentially connected, and the ultrasonic probes 4 are sequentially subjected to ultrasonic flaw detection.

The data obtained in this way is analyzed to obtain the result of the investigation of the thinning of the pipe 1.

According to the present invention, a plurality of ultrasonic probes 4 are attached at predetermined intervals in the longitudinal direction 16 and the circumferential direction 18 of the pipe 1 so that the ultrasonic probe 4 is positioned inside. Thus, since it is wound around the outer circumference of the pipe 1, it is possible to set the apparatus in a short time and easily perform ultrasonic inspection at a large number of locations.

Further, if the scaffolding is sufficient to allow the inspector to reach out and wind the belt-like material 6, it is possible to carry out the thinning survey. Therefore, the scaffold cannot be assembled and the survey cannot be performed. The number of locations can be greatly reduced.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the spirit of the present invention.

[0036]

As described above, according to the ultrasonic inspection apparatus of the present invention, an excellent effect that ultrasonic inspection at a large number of locations can be easily performed can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an example of an embodiment of the present invention.

FIG. 2 is a partially enlarged perspective view of FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is a schematic side view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piping 4 Ultrasonic probe 6 Belt 7-9 Simple bonding means 16 Longitudinal direction 18 Circumferential direction

Claims (3)

[Claims] A plurality of ultrasonic probes are provided on a strip (6) that can be wound around the outer periphery of a pipe (1) at predetermined intervals in a longitudinal direction (16) and a circumferential direction (18) of the pipe (1). An ultrasonic flaw detector comprising a contactor (4). 2. The ultrasonic flaw detector according to claim 1, wherein the band-like material (6) is constituted by a sealed bag which can be inflated by gas. 3. Simple bonding means (7) to (9) are provided at a plurality of positions so that the bonding position can be adjusted in accordance with the diameter of the pipe (1) with respect to the overlapping portions on both sides of the strip (6). The ultrasonic flaw detector according to claim 1 or 2, wherein the ultrasonic flaw detector is attached.