JPH08201360A - Portable ultrasonic flaw detecting device for round steel - Google Patents

Abstract

PURPOSE: To provide a portable ultrasonic flaw detecting device used for the internal flaw detection of a round steel such as a round steel bar or a round steel pipe. CONSTITUTION: A flexible guide member 1 having a slit-like groove section la in the longitudinal direction is wound on the outer periphery of a specimen, a probe 7 held in the groove section 1a of the guide member 1 is movably scanned by a scanner 6 wound between pulleys 3, 5, and the guide member 1 is made movable in the axial direction of the specimen at the prescribed pitch. The flaw detection signal is recorded by anultrasonic flaw detector 10, and the reliability of the scanning and recording of the internal flaw detection of a round steel can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable ultrasonic flaw detector for round steel.

[0002]

2. Description of the Related Art In the conventional ultrasonic flaw detection method, which has been widely used for nondestructive inspection of the quality of round steel, the material to be inspected is carried to the position of a fixed ultrasonic flaw detector. There are two methods: an automatic flaw detection method and a manual flaw detection method in which a material to be inspected is fixed and a portable ultrasonic flaw detector is carried there and manually inspected.

While the former automatic flaw detection method is suitable for continuous large-scale processing online, the latter manual flaw detection method requires manual scanning of the probe and recording of detected defect positions. Although there is a handicap that depends on
Since it is easy to carry and there are no restrictions on the target varieties and sizes, it is mainly used for a large number of small-quantity products.

[0004]

By the way, in the case of the above-mentioned conventional manual flaw detection method, a round bar such as a thick round bar or a large diameter round bar is used as a test material, and the entire circumference or a designated circumference is a portable type. When using an ultrasonic flaw detector to perform internal flaw detection, divide the test piece into multiple pieces in the circumferential direction and then either rotate the round bar for inspection, or the inspector digs under the round bar to inspect it. It was one of the so-called 3K work that forced heavy labor and an unreasonable work posture.

The present invention has been made to solve the problems of the conventional portable ultrasonic flaw detectors as described above. The portable ultrasonic flaw detectors are used to provide the entire circumference or a designated circumference of round steel. It is an object of the present invention to provide a portable ultrasonic flaw detector for round steel capable of automatically scanning.

[0006]

DISCLOSURE OF THE INVENTION The present invention is a portable ultrasonic flaw detector used for internal flaw detection of a round bar steel or a round steel pipe such as a round steel pipe to be inspected, which has a slit shape in the longitudinal direction. A flexible guide member having a groove portion and wound around the outer periphery of the test material, a scanning means for movably scanning the probe held in the groove portion of the guide member, and the guide member at a predetermined pitch. A portable ultrasonic flaw detector for round steel, comprising: a pitch feed device that is movable in the axial direction of a material to be inspected; and an ultrasonic flaw detector that transmits and receives to and from the probe through a flaw detection cable. Is.

The guide member is preferably configured to be longer than the circumference of the material to be tested and wound in a spiral shape in the circumferential direction of the material to be tested, and the scanning means scans the probe. The range to be applied can be designated as the entire circumference of the test material or an arbitrary circumference.

[0008]

[Operation] According to the present invention, a flexible guide member in which the probe is held in the groove is wound around the outer periphery of the material to be tested, and the probe is movably scanned by the scanning means.
Since the pitch feed device is arranged to move in the axial direction by a predetermined pitch, the internal flaw detection of the round steel can be automatically performed.

By winding the guide member spirally in the circumferential direction of the test material, it is possible to eliminate the mechanical flaw detection dead zone that occurs when the conventional test material is wound at right angles to the axial direction of the test material. Become. Further, the scanning range of the scanning means can be changed to the entire circumference or an arbitrary circumference length as required.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an outline of a portable ultrasonic flaw detector probe scanning apparatus of the present invention, and FIG. 2 is a side view thereof. In the figure, reference numeral 1 denotes a flexible guide member such as a belt, and a groove portion 1a having a predetermined width is slit in the surface thereof along the longitudinal direction. Two
Is a scanning motor attached to one end of the guide member 1, 3 is a pulley attached to the motor shaft 2a, 4 is a bearing attached to the other end of the guide member 1,
Reference numeral 5 is a pulley attached to a rotating shaft 4a that is supported by the bearing 4.

Reference numeral 6 is a scanner such as a belt or a chain wound between pulleys 3 and 5. Reference numeral 7 denotes a probe that is movable in the groove portion 1a of the guide member 1, and is attached to a part of the scanner 6 via a fixed arm 8.
Reference numeral 9 is a rotation guide such as a rotating roller that assists the scanner 6 to smoothly orbit. Reference numeral 10 is an ultrasonic flaw detector that transmits and receives a signal to and from the probe 7 via the flaw detection cable 11.

Here, the mounting structure of the probe 7 will be described in detail. As shown in FIG. 3, the probe 7 is inserted into a holding flange 12 for fixing the fixed arm 8, and the left and right side surfaces are vertically moved. Springs interposed between the four brackets 13 mounted on the section and the holding flange 12.
It is held in balance by 14a to 14d. As a result, it is possible to make a stable contact with the surface of the test material S. The biasing forces of the lower springs 14c and 14d are slightly weakened with respect to the biasing forces of the upper springs 14a and 14b, so that the probe 7 is firmly brought into close contact with the material S to be tested on the ground side when the probe 7 rotates upside down. .

A nozzle 15 is attached in the circumferential direction of the holding flange 12, and a contact medium such as water or oil is supplied through a contact medium supply pipe 16. A valve 16a is attached to the couplant supply pipe 16, and the couplant supply amount can be adjusted by the valve 16a so that stable contact can be achieved even when the probe 7 is turned upside down. The ultrasonic flaw detector 10 is mainly composed of a driving power source 17, a flaw detector body 18, a recorder 19, a contact medium tank, as shown in FIG.
It is composed of 20 and is mounted on, for example, a pitch feed device 21 as shown in FIG. 5, and exchanges signals with the probe 7 and supplies a contact medium. This pitch feeder 21 has 8 frames
It is assembled by 22a to 22h and can be adjusted according to the size of the material S to be inspected.

Drive wheels 23 are attached to the two horizontal frames 22a and 22b, and one vertical guide wheel 24 is attached to each of the four vertical frames 22b, 22c, 22f and 22g. Is attached. And
By rotating the drive wheel 23 with the pitch traveling motor 25, the ultrasonic flaw detector 10 can be moved in the axial direction of the test material S by a predetermined distance. The frame 22b,
An L-shaped holding arm 26 that holds the side surface of the guide member 1 is attached to each of 22f, 22c, and 22g.

Therefore, the case of inspecting the round steel as the material S to be inspected by using the portable ultrasonic flaw detector constructed as described above will be described with reference to FIG. First, as shown in FIG. 6 (a), the guide member 1 having the probe 7 attached thereto is spirally formed at the measurement location on the outer peripheral surface of the test material S placed on the stand 27 such as a skid. Wrap around. The condition that the length of the guide member 1 used at this time is longer than the outer peripheral length of the test material S is required. Next, as shown in FIG. 6B, the pitch feeding device 21 is set on the material S to be tested so as to surround the guide member 1, and the holding arm 26 holds the guide member 1 respectively. Further, as shown in FIG. 6 (c), the ultrasonic flaw detector 10 is placed on the pedestal of the pitch feed device 21, and the flaw detection cable 11 and the contact medium supply pipe between the probe 7 and the ultrasonic flaw detector 10 are provided. 16 is connected, and the scanning motor 2, the pitch travel motor 25, and the driving power supply 17 are connected by a power supply line (not shown). This completes the measurement preparation. Therefore, while supplying the contact medium from the contact medium supply pipe 16 to the probe 7, the scanning motor 2 is operated to rotate the scanner 6 to scan the probe 7 in the circumferential direction at a predetermined speed. The material S to be inspected is inspected. This flaw detection signal is sent to the ultrasonic flaw detector main body 18 via the flaw detection cable 11 and recorded in the recorder 19. If the scanning range at this time is set to an angle of 360 °, the entire circumference of the material S to be inspected can be detected only once without a dead zone. Next, the pitch traveling motor 25 is driven to move the pitch feed device 21 in the axial direction by a predetermined pitch to move the guide member 1, and the scanning motor 2 is reversely rotated at that position, and the probe 7 is moved. The flaw is similarly detected by scanning in the direction opposite to the step of. After the flaw detection of the entire length of the material S to be inspected is completed, the flaw detection cable 11 and the contact medium supply pipe 16 are disconnected, the ultrasonic flaw detector 10 is removed from the pitch feed device 21, and then the pitch feed device 21 is attached. Removal, and guide member 1
Remove. Then, for the next test material S, the steps from
The guide member 1, the pitch feed device 21, and the ultrasonic flaw detector 10 are attached by the procedure described above, and flaw detection is performed by the procedure described above.

The scanning range of the probe 7 described above is not limited to the entire circumference. For example, by limiting the rotation range of the scanning motor 2 to a desired desired range, for example, a half circumference (180 °). It is possible to detect flaws even within the range of 1/4 turn (90 °). Further, although the ultrasonic flaw detector 10 is mounted on the pitch feed device 21, the present invention is not limited to this, and the ultrasonic flaw detector 10 may be installed on a pedestal movably provided on the side portion of the test material S. May be.

The probe 7 used in the present invention may be either a vertical probe or an oblique angle probe.

[0018]

As described above, according to the present invention,
A flexible guide member, in which the probe is held in the groove, is wrapped around the outer circumference of the material to be tested, and the probe is movably scanned by the scanning device and moved in the axial direction by a predetermined pitch by the pitch feeding device. By doing so, the internal flaw detection of the round steel bar or the round steel pipe or the like is automatically performed, so that the reliability of scanning and recording, which was the weak point of the conventional manual flaw detection method, can be improved. It can greatly contribute to the improvement of product quality control.

[Brief description of drawings]

FIG. 1 is a plan view showing an outline of an ultrasonic flaw detection probe scanning device of the present invention.

FIG. 2 is a side view of FIG.

3 (a) is a side view and FIG. 3 (b) is a plan view showing an outline of a probe used in the present invention.

FIG. 4 is a front view showing an outline of an ultrasonic flaw detector used in the present invention.

5 (a) is a front view and FIG. 5 (b) is a side view showing an outline of a pitch feeding device used in the present invention.

6 (a) to 6 (c) are perspective views showing an assembling procedure of the portable ultrasonic flaw detector of the present invention.

[Explanation of symbols]

 1 Guide Member 1a Groove 2 Scanning Motor (Scanning Means) 3,5 Pulley (Scanning Means) 4 Bearing (Scanning Means) 6 Scanner (Scanning Means) 7 Probe 8 Fixed Arm 9 Rotation Guide 10 Ultrasonic Flaw Detector 11 Cable 12 Holding flange 14a to 14d Spring 15 Nozzle 16 Contact medium supply pipe 17 Drive power supply 18 Ultrasonic flaw detector main body 19 Recorder 20 Contact medium tank 21 Pitch feeder 22a to 22h Frame 23 Drive wheel 24 Guide wheel 25 pitch Traveling motor 26 Holding arm 27 Stand S Material to be tested

Claims (3)

[Claims] 1. A portable ultrasonic flaw detector for use in internal flaw detection of a round steel bar or a round steel pipe as a test material, which has a slit-shaped groove portion in the longitudinal direction. A flexible guide member wound around the outer periphery of the material, a scanning means for movably scanning the probe held in the groove of the guide member, and the guide member moved in the axial direction of the material to be tested at a predetermined pitch. A portable ultrasonic flaw detector for round steel, comprising: a freely movable pitch feed device; and an ultrasonic flaw detector that transmits and receives to and from the probe through a flaw detection cable. 2. The portable type for round steel according to claim 1, wherein the guide member is longer than the circumference of the test material and is wound in a spiral shape in the circumferential direction of the test material. Ultrasonic flaw detector. 3. The portable ultrasonic wave for round steel according to claim 1, wherein the range in which the probe is scanned by the scanning means is designated as the entire circumference or an arbitrary circumference of the test material. Flaw detector.