JP2006153796A - Eddy current flaw detector for flaw detection of steel pipe end - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an eddy current flaw detector for flaw detection of a steel pipe end, capable of simultaneously detecting flaws in the steel pipe end and an end surface. <P>SOLUTION: In the eddy current flaw detector for flaw detection of the steel pipe end, a sensor for the end and a sensor for the end surface inside an L-shaped flaw detector, and a copy roller for keeping constant the clearance between the sensor for the end disposed in the flaw detector, and the detected material is arranged. In the eddy current flaw detector, the sensor for the end can simultaneously detect flaws on the end and the end surface, by making the detected material rotate in a pressed state to the detected material by a spring. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a eddy current flaw detector for flaw detection on a steel pipe end face and end.

  Conventionally, when automatic flaw detection is performed on a steel pipe, the end portion and the end surface are undetected areas. To guarantee the defect of the undetected area, for example, it is disclosed in Japanese Patent Application Laid-Open No. 2001-330592 (Patent Document 1). As shown in the figure, after the specimen or sensor has made one rotation, the specimen or sensor is moved in the axial direction of the specimen by the width that can be detected by the sensor, and then rotated once again to guarantee the total length. There has been proposed a device for flaw detection of an end portion by an end flaw detector such as a steel material flaw end automatic flaw detection device that makes it possible.

  Further, as disclosed in Japanese Patent Application Laid-Open No. 2003-28838 (Patent Document 2), the rotation of the roller provided in the end face flaw detector is rotated in accordance with the outer diameter of the test material. In general, the end face flaw is guaranteed with an end face flaw detector such as an end face flaw detector detection leakage prevention method that sets and grasps the rotation state of the test object according to the set time. As described above, any flaw detection apparatus detects flaws at one end or flaws at the end face, and does not flaw the end and end faces at the same time.

JP 2001-330592 A JP 2003-28838 A

  As described above, Patent Document 1 and Patent Document 2 both detect flaws at the end of a steel pipe or flaw detect an end face, and detect flaws at the end and end face at the same time. However, since the test material is held by the copying roller, there is a problem that the test material is inclined in the left-right direction or in the up-down direction.

  In order to solve the above-mentioned problems, the inventors have made extensive developments. As a result, two or three end sensors are arranged on the end side of the flaw detector, and the position can be adjusted on the end face side. Provided is an eddy current flaw detection apparatus for flaw detection of a steel pipe end that can perform flaw detection of an end and an end surface simultaneously by providing a possible end sensor, pressing a flaw detector against the test material, and rotating the test material once. Is.

The gist of the invention is that
(1) A copying roller for arranging an end sensor and an end surface sensor inside an L-shaped flaw detector and maintaining a constant clearance between the end sensor provided in the flaw detector and the test material. An eddy current flaw detection apparatus for flaw detection of a steel pipe end portion.
(2) In the eddy current flaw detection apparatus according to (1), the end sensor can detect the end and the end face simultaneously by rotating the test material while being pressed against the test material by the spring. An eddy current flaw detector for steel pipe end flaw detection.

(3) In the eddy current flaw detection apparatus according to (1), two to three pairs of copying rollers are disposed, and the eddy current flaw detection apparatus for flaw detection for a steel pipe end part is provided.
(4) The eddy current flaw detection apparatus according to any one of (1) to (3), wherein the eddy current flaw detection apparatus for end flaw detection for a steel pipe has an end surface eddy current sensor having a position adjusting mechanism.

  As described above, it is possible to simultaneously detect the end portion and the end surface by incorporating the end flaw detection sensor and the end surface flaw detection sensor into one flaw detection apparatus and rotating the test material once, so that the undetected area The fact that the flaw detection of the end portion and the end face can be performed at the same time and the quality assurance accuracy is greatly improved provides an industrially extremely advantageous apparatus.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is an overall schematic cross-sectional view of a eddy current flaw detector for steel pipe end flaw detection according to the present invention. FIG. 1A is an overall cross-sectional view, and FIG. 1B is a cross-sectional view. As shown in this figure, two or three pairs of scanning rollers 4 each having a bearing attached to an L-shaped flaw detection device 7 are provided for rotating the test material 3 and brought into contact with the test material 3. When the test material 3 is rotated, the copying roller 4 is rotated, so that the outer diameter of the test material 3 is known by the rotation. In addition, two or three end sensors 1 were provided inside the L-shaped flaw detection device 7, and an end face sensor 2 capable of position adjustment was provided on the end face side of the test material 3. Reference numeral 8 denotes a position adjusting mechanism.

  FIG. 2 is a schematic cross-sectional view showing an eddy current flaw detector for steel pipe end flaw detection according to the present invention. FIG. 3 is a schematic cross-sectional view showing a eddy current flaw detector for steel pipe end flaw detection according to the present invention. 2 or 3, as shown in FIG. 1, the flaw detection apparatus 7 is composed of an L-shaped flaw detection apparatus, and two or three end sensors are provided inside the L-shaped flaw detection apparatus. 1 is arranged, and this flaw detection device 7 is configured to be pressed against a corner portion of a steel pipe end portion which is a test material 3.

  On the other hand, an end face sensor 2 whose position can be adjusted is provided on the end face side of the steel pipe, and the flaw detection device 7 is pressed against the test material 3 to rotate the test material 3 once, thereby performing the flaw detection on the end and the end surface simultaneously. Is. At this time, in order to keep the clearance between the end sensor 1 and the test material 3 constant, the copying rollers 4 are held in two or three pairs, so that they are inclined in the left-right direction, Accurate positioning is prevented while preventing problems such as slanting in the vertical direction.

  Further, the end sensor 1 is pressed against the test material 3 side by the spring 6, and the end sensor 1 is pushed up and down by the spring 6 to press the non-magnetic carbide shoe 5 against the test material 3. In this state, the specimen 3 can be rotated, and the non-magnetic carbide shoe 5 and the specimen 3 are always in contact with each other, regardless of changes in the diameter of the specimen 3. Accurate flaw detection can be performed in a state where the clearance between the specimen 3 and the end sensor 1 is kept constant.

1 is an overall schematic sectional view of an eddy current flaw detector for steel pipe end flaw detection according to the present invention. It is a section schematic diagram showing the eddy current flaw detector for steel pipe end flaw detection concerning the present invention. It is a cross-sectional schematic diagram which shows the eddy current flaw detector for a steel pipe end part flaw based on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 End sensor 2 End sensor 3 Test material 4 Copying roller 5 Carbide shoe 6 Spring 7 Flaw detector 8 Position adjustment mechanism


Patent Applicant Sanyo Special Steel Co., Ltd.
Attorney: Attorney Shiina

Claims (4)

An end sensor and an end surface sensor are arranged inside the L-shaped flaw detector, and a copying roller is provided to keep the clearance between the end sensor provided in the flaw detector and the test material constant. An eddy current flaw detector for flaw detection of steel pipe ends. The eddy current flaw detection apparatus according to claim 1, wherein the end sensor is capable of flaw detection at the end and the end surface by rotating the test material in a state of being pressed against the test material by a spring. An eddy current flaw detector for flaw detection of steel pipe ends. 2. The eddy current flaw detector according to claim 1, wherein two or three pairs of scanning rollers are arranged. 4. The eddy current flaw detector according to claim 1, further comprising an end surface eddy current sensor having a position adjusting mechanism.

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