JPS5851221B2 - The best way to get started - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scanning device that scans the surface of a material to be inspected using ultrasonic flaw detection (hereinafter simply referred to as flaw detection).

Conventionally, flaw detection has been performed by recording the flaw detection results in a synchronous recording device (hereinafter simply referred to as the recording device) in synchronization with the manual scanning of the probe. This device moves manually or automatically on a metal rail that is placed parallel to the welded part of the material to be inspected, and the weight of the rail is heavy, making it difficult to handle, and it is also difficult to detect curved parts. When attempting to do so, it was difficult to perform flaw detection because the rail could not be bent to match the shape of the material to be inspected.

The present invention proposes a scanning device for flaw detection that is effective even for specimens having curved parts.

FIG. 1 schematically shows the relationship between the scanning device of the present invention and the inspection material recording device. This is the material to be tested.

Among them, the welded portion 3 extends in a direction perpendicular to the plane of the paper.

4 is a scanning device of the present invention, which includes an ultrasonic probe 6 (which can be positioned by moving along a guide bar 5 in the direction of the arrow);
A synchronization signal generator 8 generates a synchronization signal in accordance with the movement of the probe (hereinafter simply referred to as a probe) and the scanning device, and supplies this to the recording device 7, and a microcontroller generates a marker signal by pressing down an operating knob 9. It is composed of a switch 10.

Reference numeral 11 denotes an ultrasonic flaw detector main body (hereinafter referred to as flaw detector), which is connected to a probe 6'3;=- and a recording device 7.

A cathode ray tube 12 of the flaw detector 11 displays a flaw detection waveform.

Among them, the recording device 7 is for recording an analog signal, and receives an analog signal 13 generated from the flaw detector 11 and records it.

14a is the ultrasonic floor covering path when the probe 6 is at the position shown by the solid line in the figure, and 14b is the ultrasonic floor covering path when the probe 6 is at the position shown by the dashed-dotted line.

When performing flaw detection with such a configuration, move the scanner 4 in a direction perpendicular to the plane of the paper so that the probe 6 moves in parallel to the welded part 3 while pressing down the knob 9 of the scanning device 4 by hand. This can be done by

That is, when performing flaw detection, the microswitch 10
A marker signal is automatically applied to the recording device 7 from the scanning device 4, and a synchronizing signal generated from the synchronizing signal generator 8 of the scanning device 4 causes paper feeding of the recording device, and the flaw detection waveform is recorded on the recording paper.

FIG. 2 shows a specific example of the scanning device 4 shown in FIG. 1, and will be explained below.

In FIG. 2, 4 is a scanning device, 5a and sb are guide bars, and 5a has a scale 15 marked thereon.

Reference numeral 6 denotes a probe, which is located on the center line that crosses the main body of the scanning device.

Reference numeral 8 designates a synchronization signal generator to be described later, reference numeral 9 designates an operation knob, and reference numeral 10 designates a microswitch, which generates a contact signal as a marker signal when the knob 9 is pressed down, that is, when the scanning device 4 is moved.

16 is a guide bar 5a for guiding the probe 6; It is a metal fitting for fixing to a predetermined position on 5b, and can be slid in the directions of arrows A and B by loosening the knob 17.

Reference numerals 18 and 19 denote rollers that rotate in contact with one side of a flexible magnetic rubber plate 20 mounted on the material to be inspected, and a belt 21 having a rack is stretched between the rollers.

Reference numeral 22 denotes a rotating body that responds to the movement of the belt 21, and the movement of this rotating body 22 is transmitted to the synchronizing pulse generating disk 24 through teeth 23 provided on its outer periphery.

Reference numeral 25 denotes holes provided at equal intervals on the outer periphery of the disk 24. Light from the light emitting element passes through the holes 25, and the light passes through the light receiving element facing the light emitting element with the disk in between. It receives light and generates a pulse output.

26 is a light emitting and photoelectric conversion section configured as described above.

27 a t 27 b > and 27 c t 27 d are magnets with weak holding power attached to the side plates 28 a and 28 b, respectively, and a wheel 29 is attached to the lower part of each magnet.

Reference numeral 30 denotes a notch provided at the bottom of the main body of the scanning device to prevent the main body from coming off the rubber plate 20 during scanning.

Since the scanning device of the present invention is constructed as described above, when the knob 9 is pushed down and the scanning device is moved on the rubber plate 20, the probe 6 is moved in parallel along the rubber plate 20, and the probe 6 is moved in parallel to the specimen material. Inject a sonic pulse.

Therefore, the welded portion 3 can be inspected for flaws as shown in FIG.

That is, by attaching a rubber plate on the material to be inspected parallel to the weld 3 and moving the scanning device over the rubber plate, the weld can be detected for flaws.

On the other hand, when the scanning device is moved, the microswitch 10
A marker signal is generated from the rollers 18 and 19, and a synchronizing pulse signal is generated from the light emitting and photoelectric conversion section in response to the rollers 18 and 19.

Among them, the number of synchronizing pulses is about 10 per scanning distance, but this depends on the relationship with the recording device, and can be changed in various ways by changing the disk.

By the way, the scanning device of the present invention includes magnets 27a to 27a.
27d is attached, so even if you take your hand off the knob during scanning, the scanning device will not move and will remain in the position where you took your hand off.

Therefore, it is convenient for flaw detection on a sloped portion, and the scanning device does not move even if the hand is removed from the scanning device at the sloped portion, which is convenient for flaw detection continuously.

Furthermore, since the scanning device of the present invention moves on a rubber magnet plate, if the rubber magnet plate is attracted to the curved portion, the probe is located on the center line of the scanning device, so that the probe can be moved on the curved portion. Can detect flaws.

Therefore, it is possible to detect not only flat plates but also test materials having curved surfaces.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the relationship between the scanning device of the present invention, the inspected material button, and the recording device, and Fig. 2 is a structural diagram showing details of the scanning device, where 1 is the inspected material, and 3 is the welded part. , 4 is a scanning device, 6
is an ultrasonic probe, 7 is a recording device, 8 is a synchronization signal generator,
9 is a knob, 10 is a microswitch, 11 is an ultrasonic flaw detector body, 18° 19 is a roller, 20 is a rubber magnet plate, 21
is a belt, and 27 is a magnet. In the figures, the same or corresponding parts are designated by the same reference numerals.

Claims (1)

[Claims] 1 Equipped with a means for generating a marker signal during scanning, a means for generating a synchronized pulse signal at every predetermined scanning distance, an ultrasonic probe that scans the surface of the specimen, and a magnet that attracts the specimen. , the probe is moved parallel to the flaw detection area by moving it over a plate-shaped rubber magnet placed parallel to the flaw detection area of the material to be tested, and the flaw detection results are transmitted via the main body of the ultrasonic flaw detection device. A scanning device for ultrasonic flaw detection, wherein the marker signal and the synchronization pulse signal are applied to the recording device, and the flaw detection results can be recorded by the recording device in association with the scanning distance.