JPS6113150A - Eddy current flaw detector - Google Patents

Abstract

PURPOSE:To enable tracing flaw detection of high precision, by installing free to rotate a flaw detecting sensor and 3 rotating rollers on the top surface of a flaw detection head. CONSTITUTION:A flaw detection sensor 4 is installed free to rotate in a plane in side a flaw detecting head 2. Further, gimbal ring 5 is supported free the swing on an axis (P2-P2) in the direction in which the head 2 intersects with a travelling direction of the specimen 1 through a right angle, and further, a pair of swing levers 6 is installed which is provided with a ring 5 on its end, the ring being free to swing on an axis (P1-P1) in the direction of travel of the specimen 1. And, when the 3 rollers 3 of the head 2 are brought into contact with a surface of the travelling specimen 1 by an action of a cylinder through the lever 6, an reaction caused by contact of the roller 3 against the specimen 1 changes continuously the rotations in the axes of P1-P1 and P2-P2 allows the surface of the specimen 1 to operate a parallel plane tracing. Consequently, the high-precision flaw detection becomes available.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an eddy current flaw detection device, and more particularly to an eddy current flaw detection device that has improved tracking performance for inspected materials running on a general transport line.

(B) Prior Art Conventionally, this type of eddy current flaw detection apparatus has carried out flaw detection by protruding a flaw detection sensor on the upper surface of a flaw detection head and directly or indirectly contacting the flaw detection sensor with the surface of the material to be inspected.

In addition, this flaw detection head has a running force of 1iiJ &
(1) It is supported on a shaft so that it can move freely, and is designed to follow changes in the plane of the material to be inspected. Therefore, during flaw detection, the flaw detection sensor constantly slides over the surface of the material to be inspected. Since the sensor is severely damaged and the flaw detection head swings in the direction of travel of the material to be inspected, it is not possible to reliably follow changes in the plane of the material to be inspected, resulting in high precision flaw detection performance. There was a problem that it was impossible to obtain.

In addition, since the flaw detection sensor was fixed to two sides of the flaw detection head, the flaw detection range was limited and could only detect a narrow width.

(c) The IE-based present invention solves these problems and makes it possible to
) To provide an eddy current flaw detection device that can reliably follow surface changes and obtain high-precision flaw detection performance, can perform tracking flaw detection over a wide range, and can withstand long-term use. The purpose is to

(11) Structure Therefore, the first feature of the present invention is that a flaw detection head that tracks and detects the surface of a material to be inspected includes a flaw detection sensor disposed inside thereof so as to be rotatable in a plane, and It is equipped with three I+-ra rotatably arranged at predetermined positions,
The second feature of the present invention is that the flaw detection head, which tracks and detects the surface of the material to be inspected, is disposed inside so as to be rotatable in a plane. It is equipped with a flaw detection sensor and three rollers rotatably disposed at predetermined positions on the upper surface of the flaw detection head so as to obtain an equal moment I in the running direction of the inspected material and a direction perpendicular thereto. The third feature of the present invention is that the flaw detection head, which tracks and detects the surface of the material to be inspected, is internally arranged so as to be rotatable in a plane. The flaw detection sensor installed in the test head and the old 4
It is equipped with 23 rollers, is pivotally supported by a gimbal ring, and further includes: 1) No. 11 to be inspected +A
A three-dimensional parallel link is provided for causing the flaw detection head to follow the change in plane of the flaw detection head.

(f) Example of a polygonal varnish and stain FIG. 1 is a plan view of a flaw detection head of an eddy current flaw detection apparatus according to the present invention, and FIG. 2 is a side view of the same. In the same figure, 1
1 is a test object 44 running on a general feed line (not shown), 2 is a flaw detection head, and 3 is a 3 + 1 lil cola rotatably disposed at a predetermined position on the upper surface of the flaw detection navel 12. , 1jij is pressed against the lower surface of the inspected material 1 -
A predetermined distance is maintained between the inspection target material 1 and the flaw detection head 2. 4 is inside the flaw detection head 2. 1' plane rotation iF
The flaw detection sensor 5 is the flaw detection sensor installed in the J function.
2 is a gimbal link that is swingably supported (P2-P2) in a direction intersecting the running force direction of the inspected material 1, and 6 is a gimbal link with the gimbal ring 5 at one end that swings in the running direction of the inspected material 1. There is a pair of swinging levers that are freely pivoted (p+-p+),
The other end of the swing bar 6 is pivotally supported on a mounting board 7, and is connected to a cylinder 8 which is mounted on the mounting board 7. 9 is a motor that rotates the flaw detection sensor 4.

The operation of the device constructed as described in Section 1 will be explained below-1.
reactor.

Three flaw detection holes 1ζ2 are placed on the surface of the inspected material 1 as it runs.
1: I-So(shi) comes into contact via the lever 6 due to the operation of the cylinder 8.

Next, the axis P1'-P+ and the axis P2 are
It changes continuously by rotation at P2, and parallel plane tracking is performed on the plane of C fracture inspection + A1.

That is, the reaction force applied to roller 3 is the axis)), Pl and the axis P
2 C follows any inclination due to rotation around P2 and its resultant rotation.

In particular, since the axis P2 P''2 is located at the contact point of the reaction force from the roller 3 and the pressing force from the cylinder 8, if the flaw detection head 2 is made of aluminum, it will easily undergo elastic internal deformation. By using hair rings, you can perform composite rotations smoothly.

3 is a side view of the flaw detection head without showing another embodiment of the eddy current flaw detection apparatus according to the present invention, FIG. 4 is a plan view of the same, and FIG. 5 is an explanation of the arrangement of the rollers. It is a diagram. As shown in FIG. 5, among the rollers 3 that are pivotally supported on the mounting plate 10 of the flaw detection head 2, the two left and right rollers 3.3 located in the force direction i'+i+ are As shown in FIG.

This position is a position where the object to be inspected 1 is located at an equal distance, that is, at an equal moment, in the traveling direction (Y-Y) and the direction <X-X> perpendicular thereto. And I:J-ra3
For example, they are placed at positions A, 13, .

One end of the coil spring 11 is attached to the flaw detection head 2, and the other end of the coil spring 11 is located on the mounting board 7. The flaw detection head 2 is placed on standby at a position having an angle of attack θ due to the biasing force of the flaw 11.

In addition, since the roller 3.3 is at the position i; l, B2 as described above, the roller 3 is handled so that the above-mentioned equal moment is maximized. -X
' has been eccentrically processed. Note that this eccentric state is naturally restricted by the rotation radius of the flaw detection sensor 4 that rotates in a plane around the outer circumference of the take-up plate 10.

Next, to describe its operation, the roller 3 disposed on the two sides of the flaw detection head 2's plate 10' has an angle of attack θ on the surface of the traveling inspected material 1 by the operation of the cylinder 8. The rollers 3.3 at positions B1 and B2 first hit the surface of the material 1 to be inspected. Next, the roller 3 at position A hits the surface of the material 1 to be inspected, and flaw detection is performed by the flaw detection sensor 4 which rotates in the plane while maintaining parallel planes.

Also, due to the unequal distance Q of A-0≠13-0, the rotational moment I around the axis 1), -P of the flaw detection head 2 is the motor 9
It is more important to consider than canceling the weight.

Figure 6 is a plan view of the flaw detection head without showing another embodiment of the eddy current flaw detection device according to the present invention, Figure 7 is a side view of the same, and Figure 8 shows the mounting position of the human cylinder. It is a schematic diagram. In the figure, 12 is a large cylinder that is disposed from the fixed frame 13 to the back surface of the mounting board 7, and 14 is suspended from the fixed frame 13 to the inner surface of the mounting board 7, and corresponds to changes in the plane of the inspected material 1. This is a 4-tree three-dimensional parallel link that allows the throat 2 to follow the flaw detection mentioned above.

Further, 15 is a guide 1-1-ra that contacts and guides the lower surface and +11.11 surface of the inspected material 1, and 16 is a spring that suspends and supports the mounting board 7.

The rest of the configuration is the same as that of the previous embodiment, so the explanation will be omitted.

Next, to explain the operation of this embodiment, the large cylinder 1
2, the mounting board 7 follows the lower surface of the material 1 to be inspected, and the guide roller 15 comes into contact with the lower surface of the material 1 to be inspected.

At this time, the mounting board 7 causes the three-dimensional parallel link 14 to perform a follow-up motion to follow the movement of the inspected material 1 in parallel motion.

Next, the flaw detector/soto-2, which is swingably attached to the mounting board 7, is pushed upward by the cylinder 8 via the swing lever 6, and is rotatably disposed on the probe and head 2. The roller 3 hit the bottom surface of the inspected material 1
1 Place the flaw detection head 2 while maintaining a predetermined distance from the material to be inspected 1.
follows the lower surface of the material 1 to be inspected. At this time, the following force relationship is large cylinder 12> cylinder 8, and the operating timing is that large cylinder 12 is first, cylinder 8 is slightly delayed, and f
'1 move.

Note that the following flaw detection is completed at the same time as cylinder 1 (cylinder 1) 2 and cylinder 8.

Therefore, when the material to be inspected approaches the flaw detection device, the mounting board 7 and the flaw detection head 2'' are retracted.
After the tip and end of A1 has passed, the large cylinder 12 is actuated and the mounting board 7 follows, and then the cylinder 8 is actuated and the flaw detection head 2 rises and follows. Gens control is performed to prevent this order from being reversed.

゛(f) Effect: The present invention has effectively achieved the desired L'' objective with the configuration described above. In particular, in the first invention, since the sensor is rotatably arranged, it is possible to carry out planar flaw detection over a wide range of the lower surface of the material to be inspected, and also in two axial directions using the gimbal ring. Since the flaw detection head is pivoted so that it can move freely, it can smoothly respond to changes in the plane of the object to be inspected.
High-precision follow-up flaw detection becomes possible.

Further, according to the second invention, equal rotation −1 in two axial directions
Flaw detection so that Niemen 1- can be tested.
Flaw detection from three 11-re saws arranged on two sides.
Is the tracking performance of the throat improved by ξ7, and its testis fb 3+? It is possible to improve the reliability of flaw detection by improving the detectability of flaws of 11 degrees, and it is also possible to push the roller evenly against the underside of the material to be inspected, making it possible to conduct flaw detection without straining the throat. The eddy current flaw detection device can withstand long-term use due to the force exerted on it.

Furthermore, according to the third invention, the flatness of the inspection target surface (
A three-dimensional object that follows the flaw detection head at the same time.
111-Since the link has been established, this three-dimensional parallel '
Due to the two-stage tracking of the head and the gimbal ring, there is no risk of the test subject colliding with the flaw detection device, the flaw detection device is protected, and it is possible to track the flaw detection head with good performance. , it is possible to use an eddy current flaw detection device with improved flaw detection accuracy.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a wing surface view of a flaw detection head of an eddy current flaw detection device according to the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a side view of a flaw detection head showing another embodiment. Fig. 4 is a plan view of the same, Fig. 5 is an explanatory diagram of the arrangement state of 11-ra, Fig. 6 is a plan view of another embodiment of the flaw detection navel F', Fig. 71x1 is a side view of the same, Fig. 8 is a schematic diagram of the large cylinder, without showing the parts. ■... Material to be inspected, 2... Flaw detection head, 3... Roller, 4... Flaw detection sensor. , 5... gimbal ring,
I4...3D planar link. Patent application - Person Nippon Steel Corporation
Shimadzu Meisakusho Co., Ltd. Agent Patent Attorney Takaharu Ohnishi Figure 1 Figure 2 Figure 3 Figure 44 Figure 5 Figure 6 Figure 1 Figure 7 Figure 8

Claims (3)

[Claims] (1) The flaw detection head that follows and detects the surface of the material to be inspected includes a flaw detection sensor disposed internally so as to be rotatable in a plane, and three rollers rotatably disposed at predetermined positions on the upper surface of the flaw detection head. What is claimed is: 1. An eddy current flaw detection device characterized in that the eddy current flaw detection device is provided with: and is pivotably supported by a gimbal ring. (2) The flaw detection head that follows and detects the surface of the material to be inspected has a flaw detection sensor that is arranged inside so as to be rotatable in a plane, and the flaw detection head is designed so that an equal moment can be obtained in the traveling direction of the material to be inspected and in the direction orthogonal thereto. An eddy current flaw detection device comprising three rollers rotatably disposed at predetermined positions on the upper surface of the flaw detection head, and swingably supported by a gimbal ring. (3) The flaw detection head that follows and detects the surface of the material to be inspected includes a flaw detection sensor disposed internally so as to be rotatable in a plane, and three rollers rotatably disposed at predetermined positions on the upper surface of the flaw detection head. An eddy current flaw detection device comprising: a gimbal ring to swingably support the flaw detection head; .