JPS61100653A - Method of adjusting angle of probe - Google Patents

Abstract

PURPOSE:To simply perform the angular adjustment of a probe within a short time, by mounting a probe block in a calibrator and adjusting the angle of the probe respectively by the columnar part and planar part of the reflection source arranged in the calibrator. CONSTITUTION:A reflector 3 is vertically provided to the piercing hole 4 of the revolvable block 5 of an angle calibration apparatus A. Next, a cylindrical block 1 is mounted to a main body fixing pat B and a valve 10 is opened to fill a contact medium. Then, a current is supplied to a probe 2 to oscillate an ultrasonic weave. A revolving shaft 14 is revolved so that the center of this beam coincides with the center axis of the columnar part 3a of the reflector 3 to adjust the angle of the probe 2. Next, the reflector 3 is rotated and the surface of the planar part 3b is positioned so as to make a right angle with the beam center of the probe 2. Subsequently, the planar part 3b of the reflector 3 is rotated over a desired angle and the rotary shaft 14 is operated, so that the beam center of the probe makes a right angle with the surface thereof, to adjust the angle of the probe.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an angle of a probe for detecting axial defects in a probe rotation type ultrasonic flaw detection device for detecting flaws in a test material such as a pipe. Regarding the adjustment method.

[Conventional technology]

Generally, as shown in Fig. 4, the swing angle of the axial defect detection probe in the circumferential direction is determined by the distance l (water distance) between the outer probe of the test material and the surface of the test material, and It is known by those skilled in the art that it can be calculated from the incident angle θ of the ultrasonic beam with respect to the surface of the material to be inspected. However, no means has been found to accurately adjust the probe to a desired swing angle.

Therefore, the conventional method for adjusting the angle of a probe for detecting axial defects is to create axial artificial defects (notches) on the inner and outer surfaces of a cylindrical adjustment test piece that is approximately the same size as the actual material being tested. 1. Insert this adjustment test piece into the probe block and rotate the test piece so that the echoes reflected from each notch appear on the monitor CRT screen of the ultrasonic flaw detector. The angle was being adjusted.

[Problem that the invention seeks to solve]

However, in the above conventional method, a test piece for adjustment must be manufactured for each size of the material to be tested, and the probe must be adjusted based on either the notch made on the slope or the inner surface of the test piece. It was not always possible to detect the other notch depending on the angle, and the probe angle had to be adjusted each time by rotating the adjustment test piece so that both notches could be detected.

In a rotating probe type flaw detection device, in order to perform high-speed flaw detection on the entire surface of the pipe material being tested, one probe block usually incorporates ten or more probes for detecting defects in the axial direction. The problem is that it takes a long time to adjust the angles of all these probes. moreover,
The reproducibility of the probe angle adjustment was also low, and the adjustment values varied depending on the operator.

Therefore, the present invention is a method developed in view of the above-mentioned problems, and its purpose is to solve the above-mentioned problems and to adjust the angle of the probe once for detecting axial defects in the test material. The goal is to provide a method that can be used.

[Means and effects for solving the problem] And the present invention provides a structure in which a reflector having a columnar part and a flat part is rotatably erected at the center of a cylindrical block to which a probe is attached so that the angle can be adjusted. Fill the cylindrical block with couplant material, then align the center of the beam emitted from the probe through the couplant with the central axis of the cylindrical part of the reflector, and The angle of the probe is calibrated by rotating the reflector and setting the center of the beam of the probe to be perpendicular to the flat part RrfJ of the reflector, which has a flat part. We tried to solve the problems.

〔Example〕

A probe angle adjustment method according to the present invention will be explained using the illustrated angle calibration device. As shown in Figure 1, (^) is the angle calibration device of the probe, which requires angle IA adjustment.
Cylindrical block (1) with 1-loss probe (2) attached
The probes can be attached and detached, and the angle of each probe can be adjusted sequentially.

Specifically, the angle calibration device (A) has a main body fixing part (B
), the reflector rotation mechanism part (C) described later, and other attached parts, the main body fixing part (B) has a cylindrical shape with a bottom,
A cylindrical block (1) is attached to the inner circumference of the main body fixing part (B).
The fixed part side signal transmission unit (1
7a) is attached.

The fixed part side signal transmission part (17a) is a monitor CRT that displays waveform signals such as reflected echoes.

It is connected to a flaw detector (not shown) equipped with a receiver and the like.

In addition, a reflector (3) that reflects the ultrasonic beam emitted from the probe is rotatably installed in the center of the interior of the main body fixing part (B). 3) consists of a cylindrical part (3a) and a flat part (3b). In this embodiment, a cylinder is used as the cylindrical part (38), and the flat part (3b)
) is used as a flat plate, and this cylinder and the flat plate are placed adjacent to each other to form a reflector (3). Of course, the reflector (3) may be formed by integrally molding a semi-cylindrical column and a flat plate to form the columnar part (3a) and the planar part (3b).
h You are free to make various design changes. The above columnar part (3a
The lower part (3a) of the lower part (3a) of
a) is a through-hole (
4) It is inserted into. The through-hole (4) is formed in the same shape as the upper part thereof. Further, the rotating block (5) is rotatably provided via a bearing (7) in a holding part (6) attached to the lower part of the main body fixing part (B). Further, the rotating block (5) is connected by a belt (9) to a gripping rotating section (8) located outside the holding section (6) via an arm (6). And the gripping rotation part (
By rotating 8), the reflector and (3) can be attached to the belt (
9), it can be rotated by a desired angle via a rotation block (5).

(10) is a connecting pipe for supplying a couplant such as water or oil into the cylindrical block (1), and (lO) is a stop valve. The cylindrical block (1) attached to the main body fixing part ([1)] can be filled with couplant.

Furthermore, the aforementioned cylindrical block (1) can be detachably attached to the body fixing part (B) using an auxiliary tool (11). , as mentioned above, multiple fence sonic probes (2)
is attached. That is, the probe is attached to a hole (12) formed at a predetermined position on the inner circumferential side of the cylindrical block (1), as shown in FIGS. 2(a) and 2(b). The probe (2) is connected to a rotation shaft (14) inserted from the liquid hole (12) into a vertical hole (13) bored in the upper surface of the cylindrical block (1). Further, a flange (15) having a hole is formed at the upper part of the rotation shaft (14).

The rotation shaft (14) can be fixed to five sides of the cylindrical block (1) with pins (16).

The angle of the probe (2) is adjusted by rotating this rotating shaft (14) with a special wrench (not shown). After adjustment, the rotating shaft (14) is bolted to the cylindrical block (1). Fix it with (16).

Further, the probe (2) is connected to a block-side signal transmission section (17b) on the outer periphery of the cylindrical block (1).

The block side signal transmission section (17b) is connected to the main body fixing section (B
) is adjacent to the fixed part side signal transmission part (17a) with a small gap, and performs signal transmission for transmission and reception.

(18) is a through bolt for fixing the fixed part side signal transmission part to the main body fixing part (8). (19) is Patsukin,
(20) is a seal. (21) is a push-up shaft for removing the reflector (3) from the main body fixing part (B),
It is inserted into the through hole (4) of the rotation block (5).

The cough pushing shaft (21) has a lower end portion (
21) and the rotating part (5)* (22
) is usually pressed downwards by the explosion. The axis (21
) is in contact with the tip of the lever (23). Further, the lever (23) is supported at one point inside a cover (24) attached to the lower part of the main body fixing part (B). The rear end of the lever (23) projects outward from the cover (24).

By lowering the rear end of the lever (23) downward,
The shaft (21) that comes into contact with the tip of the lever (23) is
, (22) and is pushed upwards.

The reflector (3) installed on the rotating block (S) is
It can be removed from the cough rotation block (5).

The probe (
Attach the cylindrical block (1) with the probe (2) attached and attach the probe (
Perform the angle adjustment in 2).

First, the reflector (3) is erected in the center of the angle calibration device (A), that is, in the through hole (4) of the rotation block (5). Next, hold the auxiliary tool (11) and insert the cylindrical block (1) into the bottomed cylindrical body fixing part (II).
1) Attach it to the specified position. Next, stop valve (10
) and fill the couplant into the cylinder.

Then, the probe (2) attached to the cylindrical protrusion (1) is energized via the fixed part side signal transmission part (17a) and the block side signal transmission part (17b), and from the probe (2). Emits ultrasonic waves. While displaying the reflected echo of this oscillated ultrasonic wave on the monitor CRT of the flaw detector connected to the signal transmission section (17a) on the fixed part side, perform the following operations to obtain the maximum value of the waveform displayed on the screen. Adjust the angular position of the probe (2). That is, as shown in Figures 1 and 3 (a), hold the reflector (3) so that its cylindrical shape (3a) faces toward the desired probe (2) attached to the cylindrical block (1). Operate the rotating part (8). Then, as shown in FIG. 3(B), the probe (2) is attached to the central axis of the cylindrical portion (3a).
) Remove the pole 1-(16) from the cylindrical block (1) so that the beam centers of Adjust the angle of the probe (2) to the maximum value of shaped part (3b
) and the beam center of the probe are at right angles, that is, the plane part (3b) of the reflector (3) is located at the position where the waveform on the screen is maximum. ), the planar portion (3b) of the reflector (3) is rotated by a desired angle, and then the planar portion (3b) is rotated as shown in FIG. 3(e).
The rotation axis (14) is operated so that the beam center of the probe is perpendicular to the surface of the probe, and the angle of the probe is adjusted by 1 lil, thereby completing the angle adjustment of the probe.

The angles of other probes attached to the cylindrical block (1) are sequentially adjusted like a ridge.

[Effects of the present invention]

In this way, the present invention allows a probe block to be installed in a calibrator and a cylindrical part and a planar part, which are reflection sources, arranged in the center of the calibrator, before performing flaw detection on a test material. Since this method allows the angles of the desired probes installed on the block to be adjusted individually, the angles of each probe can be easily adjusted, and the angle adjustment of the probes can be done in a short time. It can be done in time.

In addition, there is no need to manufacture adjustment test pieces for each material size as in the past, and according to the method of the present invention, the accuracy of angle adjustment of each probe can be improved more than ever. can. Furthermore, the method of the present invention has great effects, such as being able to solve the problem of conventional adjustment methods, such as variations in adjustment values depending on the operator.

[Brief explanation of drawings]

Fig. 1 is an explanatory cross-sectional view of the main parts of an angle calibration device according to an embodiment for carrying out the method of the present invention, and Fig. 2 (a) shows the main parts of a probe (2) attached to a cylindrical block (1). Figure 2 (b) is a cross-sectional plan view of the probe (2) attached to the cylindrical block (1).
), FIG. 3 is an explanatory diagram of the angle adjustment procedure, and FIG. 4 is an arrangement diagram of the probe and the test material in axial defect detection. (1)...Cylindrical block, (2)...Probe, (
3)...Reflector, (3a)...Cylindrical part, (3b)
...Planar part. Applicant Nippon Taraud Kramer Co., Ltd. Figure 3

Claims (1)

[Claims] 1. A reflector having a cylindrical part and a flat part is rotatably installed in the center of a cylindrical block to which a probe is attached so that the angle can be adjusted, and the cylindrical block is filled with couplant, and then The center of the beam emitted from the probe via the couplant is made to coincide with the central axis of the cylindrical part of the reflector, and then the reflector is rotated so that the surface of the planar part and the probe are aligned. The center of the beam of the probe is set to be at a right angle, and the reflector is further rotated by a desired angle, and the center of the beam of the probe is set to be at a right angle to the surface of the flat plate portion of the rotated reflector. A method for adjusting the angle of a probe, characterized in that the angle of the probe is calibrated.