JPH0843369A - Non-destructive inspection device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a nondestructive inspection device with a simple structure, which maintains stable flaw detection sensitivity of a flaw detection sensor and does not cause scratches or scratches on a material to be inspected. In the nondestructive inspection device 10 that detects a defect of the inspection target material 1 by moving the inspection base 12 supporting the inspection sensor 13 relative to the inspection target material 1, the inspection base 12 includes the inspection target material 1 And a rotating ball 15 that keeps a constant distance between the flaw detection sensor 13 and the material to be inspected 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a destructive inspection device such as a leakage magnetic flux flaw detector, an ultrasonic flaw detector and the like.

[0002]

2. Description of the Related Art A nondestructive inspection apparatus detects a defect in a material to be inspected by moving a flaw detection base supporting a flaw detection sensor relative to the material to be inspected. At this time, in the nondestructive inspection device, in order to stabilize the flaw detection sensitivity of the flaw detection sensor,
Distance that the sensor makes to the material to be inspected (lift-off amount)
Must be kept constant.

Therefore, in the prior art, as described in Japanese Patent Laid-Open No. 59-75150, the shoe provided on the flaw detection base is slid on the material to be inspected to keep the above-mentioned lift-off amount constant. There is.

[0004]

However, the prior art has the following problems. The shoe provided on the flaw detection table is likely to wear due to sliding contact with the material to be inspected, and as a result of changing the lift-off amount due to this abrasion, the flaw detection sensitivity becomes unstable. That is, the lift-off amount decreases as the shoe wears, resulting in increased flaw detection sensitivity.
Even non-defective ones are mistakenly detected as defective.

As a result of the shoe sliding on the material to be inspected, scratches are generated on the surface of the material to be inspected. In Japanese Utility Model Laid-Open No. 64-17462, a flaw detection table provided with a rotary roller is described, but in this case also, there are the following problems.

In the rotary nondestructive inspection apparatus in which the flaw detection table rotates with respect to the material to be inspected, the outer diameter of the material to be inspected is changed in order to keep the scanning speed of the flaw detection sensor for defects in the material to be inspected constant. In such a case (for example, large diameter), it is necessary to change (for example, decelerate) the rotational speed of the flaw detection table relative to the material to be inspected. In such a case, the angle θ _P formed by the scanning pitch of the flaw detection sensor with respect to the material to be inspected changes, so the roller angle adjustment work for adjusting the inclination angle θ _R of the rotating roller to the above θ _P Is required. That is, the nondestructive inspection device needs to have a roller angle adjusting function, and inevitably requires complicated adjustment work every time the outer diameter of the inspected material is changed. Incidentally, in FIG. 6, 1 is a material to be inspected,
Reference numeral 2 is a flaw detection table, 3 is a sensor, and 4 is a rotating roller. The edge of the end surface of the rotary roller may cause scratches on the surface of the material to be inspected.

It is an object of the present invention to provide a nondestructive inspection apparatus having a simple structure, which maintains stable flaw detection sensitivity of a flaw detection sensor and does not cause scratches or scratches on a material to be inspected.

[0008]

SUMMARY OF THE INVENTION According to the present invention, in a nondestructive inspection apparatus for detecting a defect in a material to be inspected by moving a flaw detection table supporting a flaw detection sensor relative to the material to be inspected, It is provided with a rotating ball which is brought into contact with the material to be inspected and keeps a constant distance from the material to be inspected by the flaw detection sensor.

[0009]

[Operation] The rotating ball provided on the flaw detection table is in smooth contact with the material to be inspected in all directions and is less likely to be worn. Therefore, the distance (lift-off amount) formed by the flaw detection sensor with respect to the material to be inspected is kept constant for a long period of time, and the flaw detection sensitivity is kept stable.

The rotating ball of the flaw detection table makes point contact with the surface of the material to be inspected. Therefore, in the rotary non-destructive inspection device in which the flaw detection table rotates with respect to the material to be inspected, the outer diameter of the material to be inspected is changed in order to always keep the scanning speed of the flaw detection sensor for defects in the material to be inspected ( In the case of (for example, a large diameter), when the relative rotation speed of the flaw detection table with respect to the inspection material is changed (for example, deceleration), the angle θ _P formed by the scanning pitch of the inspection sensor with respect to the inspection material changes. However, it is not necessary to adjust the mounting state of the rotating ball. Therefore, the device configuration of the nondestructive inspection device is simplified, and the work procedure is also simple. The rotating ball does not generate scratches or scratches on the surface of the material to be inspected.

[0011]

1 is a schematic view showing an embodiment of the present invention, FIG.
Is a schematic diagram showing the overall configuration of the nondestructive inspection device, FIG. 3 is a schematic diagram showing an angle θ _P formed by a scanning pitch of a flaw detection sensor with respect to a material to be inspected, and FIG. 4 is a schematic diagram showing results of the first embodiment. 5 is a schematic diagram showing the results of the second embodiment, and FIG. 6 is a schematic diagram showing the conventional example.

In the rotary nondestructive inspection apparatus 10, as shown in FIG. 2, a rotary flaw detection table 12 is installed around a through-passage of a material to be inspected (steel pipe) 1 conveyed by a V roller 11. As shown in FIG. 1, the flaw detection table 12 has a flaw detection sensor 13
The inspection device 1 is supported by the rotating device 14 while supporting the
Is rotated around to detect a defect in the material 1 to be inspected along a spiral scanning path for the material 1 to be inspected. Θ in FIG.
_P is an angle formed by the scanning pitch of the sensor 13 with respect to the inspected material 1.

At this time, the flaw detection table 12 is provided with a rotating ball 15 which is in contact with the inspection object 1 and keeps a constant distance (lift-off amount) formed by the inspection sensor 13 with respect to the inspection object 1.

The nondestructive inspection apparatus 10 includes a flaw detection sensor 13
The rotating balls 15 are provided at two positions (180 degrees apart) in the circumferential direction of the flaw detection table 12. However, the flaw detection sensor 13 and the rotating ball 15
May be provided at three or more positions in the circumferential direction of the flaw detection table 12.

The operation of this embodiment will be described below. The rotating ball 15 provided on the flaw detection table 12 smoothly rolls on the inspected material 1 in all directions and is less likely to be worn. For this reason,
The distance (lift-off amount) formed by the flaw detection sensor 13 with respect to the material to be inspected 1 is kept constant for a long time, and the flaw detection sensitivity is kept stable.

The rotating ball 15 of the flaw detection table 12 makes point contact with the surface of the material 1 to be inspected. Therefore, in the rotary nondestructive inspection device 10 in which the flaw detection table 12 rotates with respect to the inspection target material 1, the scanning speed of the flaw detection sensor 13 for defects of the inspection target material 1 is always kept constant. When the outer diameter is changed (for example, the diameter is large), when the relative rotation speed of the flaw detection base 12 with respect to the inspection material 1 is changed (for example, deceleration), the scanning pitch of the flaw detection sensor 13 with respect to the inspection material 1 is changed. Even if the formed angle θ _P changes, it is not necessary to adjust the mounting state of the rotating ball 15. Therefore, the device configuration of the nondestructive inspection device 10 is simplified, and the work procedure is also simple. The rotating ball 15 does not generate scratches or scratches on the surface of the inspection object 1.

(First Embodiment) (FIG. 4) The present invention was applied to a rotary leakage magnetic flux flaw detector. The example of the present invention uses a rotating ball made of super hard steel, and the conventional example uses a ceramic type shoe.

In the example of the present invention, the amount of wear of the rotating ball is shown in FIG.
As shown in (A), it is extremely small, and the flaw detection sensitivity is shown in FIG. 4 (B).
It became semi-permanently constant as shown in. In addition, no flaw was found on the material to be inspected.

(Second Embodiment) (FIG. 5) The present invention was applied to a rotary ultrasonic flaw detector. The example of the present invention uses a rotating ball made of cemented steel, and the conventional example uses a metal shoe made of a Cr-based sprayed metal.

In the example of the present invention, the amount of wear of the rotating ball is as shown in FIG.
As shown in (A), it is extremely small, and the flaw detection sensitivity is shown in FIG. 5 (B).
It became semi-permanently constant as shown in. In addition, no flaw was found on the material to be inspected.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and changes in design within the scope not departing from the gist of the present invention can be made. Even if it exists, it is included in the present invention. For example, the nondestructive inspection device of the present invention can also be applied to a straight-ahead nondestructive inspection device.

[0022]

As described above, according to the present invention, it is possible to obtain a non-destructive inspection device having a simple structure, in which the flaw detection sensitivity of the flaw detection sensor is kept stable and which does not cause scratches or scratches on the material to be inspected. be able to.

[Brief description of drawings]

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

FIG. 2 is a schematic diagram showing an overall configuration of a nondestructive inspection device.

FIG. 3 is a schematic diagram showing an angle θ _P formed by a scanning pitch of a flaw detection sensor with respect to a material to be inspected.

FIG. 4 is a schematic diagram showing the results of the first embodiment.

FIG. 5 is a schematic diagram showing the results of the second embodiment.

FIG. 6 is a schematic view showing a conventional example.

[Explanation of symbols]

 2 Inspected material 10 Nondestructive inspection device 12 Flaw detection table 13 Flaw detection sensor 15 Rotating ball

Claims (1)

[Claims] 1. A nondestructive inspection apparatus for detecting a defect in a material to be inspected by moving a flaw detection table supporting a flaw detection sensor relative to the material to be inspected, and the flaw detection table being in contact with the material to be inspected for flaw detection. A non-destructive inspection device comprising a rotating sphere that keeps a constant distance between the inspection sensor and the material to be inspected.