JPH03225274A - Manual ultrasonic flaw detector - Google Patents

Abstract

PURPOSE:To manually move a flaw detector body to detect a flaw by providing the body with a rotor, a position detector and an ultrasonic probe. CONSTITUTION:A ball 23 is arranged in the flaw detector body 22 through a bearing 23A so as to be projected from the aperture part 22A of the body 22 by a prescribed length. An X-axis position detector 24 is arranged in the vicinity of the ball 23, a roller 24C is rotated so as to follow the X-direction rotation of the ball 23 to detect the X-direction moving distance of the body 22 and a Y-axis position detector 25 similarly detects the Y-axis direction moving distance of the body 22. The ultrasonic probe 2 is inserted into a guide hole 22B and the tip of the probe 26 is projected from the lower face of the body 22 and pressed to a body s to be detected with a prescribed pressure. Since the ball 23 comes into contact with the body S in the grasped state of the body 22, the body 22 is manually scanned and the moving positions of the body 22 and the probe 26 are detected by the detectors 24, 25, the position of an internal defect of the body S to be detected is specified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a manual ultrasonic flaw detector suitable for use in ultrasonic detection of internal defects in welded structures, for example.

[Conventional technology]

Generally, internal defects in welded structures and the like are detected from the outside using an ultrasonic flaw detector.

Therefore, FIGS. 4 and 5 show this type of conventional ultrasonic flaw detection apparatus.

In the figure, reference numeral 1 indicates an ultrasonic flaw detection device that is orthogonal to the X and Y axes.
(See Figure 5) A fixed stand 2 for magnets etc. installed on the
2, an X-axis moving section 4 movably provided on the X-axis guide 3 and having a built-in X-axis position detector (not shown), and the X-axis moving section 4, one end is fixed to the Y-axis guide 5 and the other end is free, and the Y-axis guide 5 is movably provided and has a built-in Y-axis position detector (not shown). 6, and an X-axis moving section 4. The Y-axis moving section 6 is connected to the X-axis guide 3. Y
It is movable along the axis guide 5 in the X and Y directions.

In addition, the X-axis moving section 4. The position detector of the Y-axis moving unit 6 has a harness 7.7. ... are connected to output detection signals and the like to an external controller (not shown).

Reference numeral 8 indicates an ultrasonic probe attached to the lower surface side of the moving unit 6 via an attachment part 8A, and the probe 8 is composed of an ultrasonic transmitter, a receiver (none of which are shown), etc. It is connected via 9. The probe 8 is designed to detect internal defects in the object S by transmitting ultrasonic waves from a transmitter toward the object S and receiving the reflected waves with a receiver.

The conventional ultrasonic flaw detection device has the above-mentioned configuration, and its operation will be explained next as shown in FIG. , a Y-axis orthogonal type ultrasonic flaw detection device 1 is installed on the object S to be detected, and an operator operates the ultrasonic flaw detection device l via a controller.That is, the ultrasonic flaw detection device 1 is an ultrasonic probe. 8 in contact with the surface of the object S to be detected, move the X-axis guide 3.X-axis moving unit 4.Y-axis guide 5.
The X-axis guide 3 and the Y-axis guide 5 are
The ultrasonic probe 8 is sequentially moved in the X and Y directions within a certain range limited by the length of. The ultrasonic waves emitted from the ultrasonic probe 8 toward the inside of the object S are reflected by internal defects of the object S, and are received by the receiver of the ultrasonic probe 8 for flaw detection. A signal is output to the controller via the harness 9 to detect internal defects in the object S to be detected. Further, the moving position of the ultrasonic probe 8 is detected by each position detector in the moving section 4.5 and outputted to the controller. Thus, if the detected object S has an internal defect such as a welding defect,
The operator can know the position, size, etc. of the internal defect in the object S through a display connected to the output side of the controller.

Furthermore, as other conventional techniques, ultrasonic flaw detection apparatuses shown in FIGS. 6 and 7 are also known.

In the figure, reference numeral 11 indicates an arm-type ultrasonic flaw detection device, and the arm-type ultrasonic flaw detection device 11 is fixed on the object S to be detected by a fixing stand 12, and a base 13 has a built-in position detector (not shown). a rotating part 14 which is rotatably provided above the base 13 and has a built-in position detector (not shown); a first arm 15 with a built-in first arm 1;
A second arm 16 is provided at the tip of the second arm 16 so as to be movable up and down and has a built-in position detector, etc., and a third arm 1 is rotatably provided at the tip of the second arm 16 and has a built-in position detector etc.
It is roughly composed of 7. In addition, the turning section 14. 1st
Arm 15. Second arm 16. The position detector of the third arm 17 includes harnesses 18, 18. ... are connected to output detection signals and the like to an external controller (not shown). Reference numeral 19 indicates an ultrasonic probe attached to the lower end side of the third arm 17 via the attachment part 19A. Connected to the controller through.

The arm-type ultrasonic flaw detection device 11 configured in this manner is also limited to the length and rotation angle of each arm 15, 16, and 17, similar to the above-mentioned X- and Y-axis orthogonal type ultrasonic flaw detection device 1. Since internal defects can be detected while bringing the ultrasonic probe 19 into contact with the object S to be detected such as a welded structure within a certain range, the operator can detect the location of the internal defect in the object S to be detected, You can find out the size etc.

[Problem to be solved by the invention] By the way, in the above-mentioned prior art, as shown in FIG.
, when performing flaw detection on the object S to be detected with the Y-axis orthogonal type ultrasonic flaw detector 1, if the object S to be detected has a protrusion S3 etc., flaws can be detected in the flat area B, but the X-axis guide 3 In range A, which is narrower than the range A and has the protrusion S1, the ultrasonic flaw detection device 1 cannot be installed so that the ultrasonic probe 8 comes into contact with the object to be detected S, and the part in range A cannot be flaw-detected. There's a problem.

On the other hand, in another conventional technique shown in FIG. Since the rotation range of one arm 15 is limited, the ultrasonic probe 19
There is a problem in that the flaw detection range is limited and flaw detection cannot be scanned in range A in FIG.

And, X and Y axis orthogonal type, arm type ultrasonic flaw detection equipment l,
11, the flaw detection range is different from each guide 3.
5 and the length of each arm 15°16.17 and the rotation angle of each arm 15°16.17. Therefore, when detecting defects over a wide range of the object S, each ultrasonic flaw detector 1° 11 on the object S to be detected, which results in an increase in flaw detection time and flaw detection cost.

In addition, X and Y axis orthogonal type, arm type ultrasonic flaw detection equipment 1, 1
In either case, in order to obtain a wide flaw detection range, the ultrasonic flaw detection equipment itself has to be made larger, which not only makes it inconvenient to carry and install, but also increases the cost required for flaw detection. There's a problem.

The present invention has been made in view of the above-mentioned problems of the prior art.The present invention can be made compact as a whole, can easily perform flaw detection on an object to be detected by manual operation, and can widen the flaw detection range. The present invention provides a manual ultrasonic flaw detector as described above.

[Means for Solving the Problems] The configuration adopted by the present invention in order to solve the above-mentioned problems includes a flaw detector main body that can be manually operated, and a flaw detector that is provided in the flaw detector main body and that comes into contact with the surface of the object to be detected. a rotating body that rotates with the rotation body; a position detection means that is located near the rotating body and is provided on the flaw detector body and detects the rotation of the rotating body as a moving position of the flaw detector body; and an ultrasonic probe that is supported by the flaw detector main body so as to be close to or in contact with the surface of the object, and detects flaws in the object by emitting ultrasonic waves toward the object.

[Effect]

With the above configuration, the flaw detector body can be manually scanned while the rotating body is in contact with the object to be detected while the flaw detector body is being held, and the moving position of the flaw detector body and the ultrasonic probe can be determined using the position detector. By detecting it, it becomes possible to specify the position of the internal defect in the object to be detected.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. 1 and 2 show a first embodiment of the invention.

In the figure, 21 is a manual ultrasonic flaw detector according to this embodiment, and 22
indicates the main body of the ultrasonic flaw detector 21, which is held and operated by the operator. Inside the main body 22 of the flaw detector is a rotating body that rotates in contact with the surface of the object S to be detected. A spherical ball 23 is provided via a bearing 23A. The ball 23 protrudes by a predetermined distance from an opening 22A located on the lower surface side of the flaw detector main body 22, so that the flaw detector main body 22 can be smoothly moved over the object S to be detected.

Reference numeral 24 indicates an X-axis position detector as a position detection means located in the vicinity of the ball 23 and provided in the flaw detector main body 22. It is roughly composed of a detector body 24A and a roller 24C that is attached to the rotation shaft 24B of the detector body 24A and rotates in contact with the ball 23, and the rotation of the roller 24C is transmitted to the detector body 24A via the rotation shaft 24B. The data is transmitted to the internal encoder. And said X
In the shaft position detector 24, a roller 24C is constantly pressed toward the ball 23 by a spring 24D disposed between the detector main body 24A and the flaw detector main body 22, and the roller 24C follows the rotation of the ball 23 in the X-axis direction. By rotating, the flaw detector body 2
2 in the X-axis direction can be detected by the detector main body 24A.

Further, 25 is located near the ball 23 and the flaw detector main body 2
The Y-axis position detector 25 is shown as another position detecting means provided in the X-axis position detector 24, and similarly to the X-axis position detector 24, the Y-axis position detector 25 has a detector main body 25A and a rotating shaft 25B. , a roller 25C, and a spring 25D, the roller 25C rotates following the rotation of the ball 23 in the Y-axis direction, so that the amount of movement of the flaw detector body 22 in the Y-axis direction can be measured by the amount of movement of the flaw detector body 22 in the Y-axis direction. It can be detected at 25A.

Reference numeral 26 indicates an ultrasonic probe that is slidably inserted into a guide hole 22B formed in the vertical direction of the flaw detector main body 22, and the probe 26 is similar to the ultrasonic probe 8 described in the prior art.
The flaw detector main body 22 has a similar structure, and its tip side protrudes from the lower surface of the flaw detector main body 22. Further, a guide cylinder 26A is fitted and fixed on the outer periphery of the proximal end of the ultrasonic probe 26, and a spring 28 that constantly biases the ultrasonic probe 26 downward is provided between the guide cylinder 26A and the spring receiver 27. It is arranged. The flaw detector main body 22 is provided with an adjustment screw 29 located above the spring holder 27 for adjusting the spring force of the spring 28.
The tip of 6 is pressed against the surface of the object S to be detected with a predetermined pressure.

Furthermore, 30 indicates a connector attached to the connection port 22C of the flaw detector main body 22, and the connector 30 connects each position detector 24, 25 and the ultrasonic probe 26 to a controller (not shown) via a harness 30A. These signals are input and output to the controller.

The ultrasonic flaw detector 21 according to this embodiment has the above-described configuration, and when an operator manually moves the flaw detector main body 22 along the surface of the object S to be detected, the ball 23
Since it contacts the surface of the object S to be detected and rotates, the flaw detector main body 22 can be smoothly moved along the surface of the object S to be detected.

The rotation of the ball 23 is detected by the position detectors 24 and 25 as the moving position of the flaw detector main body 22 in the X and Y directions, respectively, and the detected X.

The position signal in the Y direction is output to the controller via the connector 30, etc., and the ultrasonic waves emitted by the ultrasonic probe 26 toward the object S are reflected by internal defects in the object S, and By receiving the flaw detection signal with the receiver of the ultrasonic probe 26, the flaw detection signal is outputted to the controller via the connector 30 and the like, and internal defects in the object S to be detected are detected. In this way, if the detected object S has an internal defect such as a welding defect, the operator can check the position, size, etc. of the internal defect in the detected object S via the display connected to the output side of the controller. You can know.

Furthermore, even if the surface of the object S to be detected is uneven, the ultrasonic probe 26 is slidably provided in the flaw detector main body 22 via the guide tube 26A, the spring receiver 27, etc., so that the ultrasonic probe 26 can The probe 26 can be made to follow the irregularities on the surface of the object to be detected S, and stable flaw detection can be performed.

Therefore, in this embodiment, the entire ultrasonic flaw detector 21 can be formed compactly, and flaws can be freely detected over a wide range on the object S by manual operation.
In addition to being able to reliably detect internal defects without being limited by the shape of the device, it is also easy to carry and install, reducing the cost of flaw detection.

Further, FIG. 3 shows a second embodiment of the present invention, and the feature of this embodiment is that the rotating body is composed of a disc-shaped roller, and the roller is pressed against the surface of the detected object S by a spring. This is because I decided to add it.

In the figure, reference numeral 31 indicates a single-axis scanning type manual ultrasonic flaw detector according to the present embodiment, and reference numeral 32 indicates a flaw detector main body constituting the main body of the manual ultrasonic flaw detector 31. is provided with an upper lid 33, which allows the flaw detector main body 32 to be
34 is an opening 32 located on the lower side of the flaw detector main body 32.
The flaw detector main body 32 is placed in contact with the object S through A.
The rotation of the roller 34 is transmitted via a rotating shaft 34A to a position detector 35 as a position detecting means such as an encoder. detects the rotation of the roller 34 as the moving position of the flaw detector main body 32, and outputs the detection signal to a controller (not shown) via a harness 35B or the like. Here, the position detector 35 is attached to the side surface of the flaw detector main body 32 so as to be movable up and down.

Further, 36 indicates an abbreviated support plate that supports the roller 34 vertically movably via the rotation shaft 34A, and the support plate 36 is slidably provided in the flaw detector main body 32, and
Together with the roller 34, the roller 34 is constantly urged downward by a spring 37 disposed between the roller 34 and the roller 34. Then, the roller 3
4 can move up and down along with the position detector 35 to follow the unevenness of the surface of the object S to be detected.

Reference numeral 38 indicates an ultrasonic probe slidably inserted into the guide hole 32B of the flaw detector main body 32. It protrudes from the lower surface of the flaw detector main body 32. Further, a stepped cylindrical guide tube 38A is fixed to the outer periphery of the probe 38, and the guide tube 38A is always urged downward together with the ultrasonic probe 38 by a spring 39 disposed between the guide tube 38A and the upper lid 33. This allows the ultrasonic probe 38 to follow the irregularities of the object S to be detected together with the roller 34.

Thus, although the present embodiment configured in this way can also obtain almost the same effects as the first embodiment, in particular, in this embodiment, the roller 34 is made vertically movable via the spring 37. Since it is provided, the roller 34 can be rotated to follow the irregularities of the object S to be detected, and the flaw detector 31 can be moved more smoothly on the object S to be detected during manual operation.

In the second embodiment, the roller 34 and the position detector 35 are provided on the flaw detector body 32 so as to be movable up and down, but instead of this, the position detector 35 may be fixed to the flaw detector body 32. The roller 34 may also be configured to be mounted and rotated on the detected object S.

Furthermore, in each of the above embodiments, the ultrasonic probe 26 (38)
Although the tip of the ultrasonic probe 26 (38
) may be immersed in water or oil so that the tip thereof is brought close to the surface of the object S to be detected.

[Effects of the Invention] As detailed above, according to the present invention, since the rotating body, the position detection means, and the ultrasonic probe are provided in the main body of the flaw detector,
The entire structure can be made compact, and the flaw detector body can be moved manually to perform flaw detection on the object to be detected.
Not only can internal defects be detected without being limited by the shape of the object to be detected, but it also has the advantage of being easy to carry and install.

[Brief explanation of drawings]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a longitudinal sectional view of a manual ultrasonic flaw detector, and FIG. 2 is a sectional view in the direction of arrow RL-II in FIG. 1. 3 is a vertical sectional view of a manual ultrasonic flaw detector showing a second embodiment of the present invention, and FIG.
5 and 5 show the prior art, FIG. 4 is a perspective view of an ultrasonic flaw detection device orthogonal to the X and Y axes, and FIG. 5 is an explanatory diagram showing how the ultrasonic flaw detection device is orthogonal to the X and Y axes. , FIG. 6 and FIG. 7 show other conventional techniques, with FIG. 6 being a perspective view of an arm-type ultrasonic flaw detection device, and FIG. 7 being an explanatory view showing how the arm-type ultrasonic flaw detection device is used. 21.31...Manual ultrasonic flaw detector, 22.32...
・Flaw detector body, 23...Ball (rotating body), 24゜2
5.35...Position detector (position detection means) 26.38
...Ultrasonic probe, 34...Roller (rotating body).

Claims (1)

[Claims] a manually operable flaw detector body; a rotating body provided on the flaw detector body and rotating in contact with the surface of the object to be detected; and a rotating body provided on the flaw detector body located near the rotating body, a position detection means for detecting the rotation of a rotating body as a moving position of the flaw detector body; A manual ultrasonic flaw detector consisting of an ultrasonic probe that detects flaws in a target object by emitting signals.