JPH0534324A - Ultrasonic inspection device of metal bar-shaped material - Google Patents

Abstract

PURPOSE:To obtain an ultrasonic inspection device which can perform inspection by ultrasonic flaw detection of a metal bar-shaped material such as a metal round bar or a metal pipe by automatically scanning a probe head with an ultrasonic probe. CONSTITUTION:A probe head 10 with an ultrasonic probe is provided with four tracing rollers 16a, 16b, 18a, and 18b where center axis lines are mutually parallel and which can be rotated freely and is in contact with an outer- periphery surface of a round bar steel M at an angle to the longitudinal direction of the round bar steel M to be inspected. Further, the probe head 10 is so supported that it can move freely in the longitudinal direction of the round bar steel M by a horizontal arm 7 which is suspended from a wire rope 6 so that it can reciprocate freely and a vertically movable arm 8 which is interlocked to it so that it can move vertically. When the round bar steel M is rotated around the axis center by bar-shaped rotary devices 2 and 3, the probe head 10 travels in the longer direction on an outer-periphery surface of this round bar steel M.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to ultrasonic inspection of metal rod-shaped materials such as round bar steel and steel pipe having a relatively large diameter.
The present invention relates to an ultrasonic inspection device for a metal rod.

[0002]

2. Description of the Related Art Conventionally, inspection of a relatively large-diameter round steel bar having a diameter of about 70 to 250 mm by ultrasonic flaw detection has generally been performed manually. FIG. 5 is a diagram for explaining a conventional ultrasonic inspection of a round bar steel by hand, and FIG. 6 is a diagram showing a scanning state of a probe head by a human in the conventional ultrasonic inspection of a round bar steel.

That is, as shown in FIGS. 5 and 6, the round steel bars M to be ultrasonically inspected are arranged in a horizontal posture on a stand 51 assembled on the floor so as to face each other in a fence shape. Worker W1 is a probe head with an ultrasonic probe
The probe head 52 is pressed against the round steel bar M and is moved in the longitudinal direction while drawing a zigzag locus in the outer peripheral direction of the round steel bar M, so that the probe head 52 scans the entire round steel bar.

In this case, the other worker W2 monitors the echo signal from the ultrasonic probe of the probe head 52 displayed on the cathode ray tube of the ultrasonic flaw detector 53, and when a defect echo signal is generated. , Sends a signal to the worker W1 scanning the probe head 52 and collects the defect echo data. Further, the worker W1 who has received the signal marks the defect occurrence position of the round steel bar M.

A so-called gap method is used as an ultrasonic flaw detection method for the round steel bar M. In the ultrasonic probe (not shown), the ultrasonic head has a probe head 52 and an ultrasonic wave emission surface with respect to the outer peripheral surface of the round steel bar M. Water is installed as a contact medium in the gap between the ultrasonic wave emitting surface and the outer peripheral surface of the round steel bar M, which is installed with a slight gap (shown in the figure). It is designed to be supplied through a water hose (not shown) connected to (not shown).

[0006]

However, in such a conventional manual ultrasonic inspection method, a probe head incorporating an ultrasonic probe is used for the outer circumference of a metal rod-shaped member such as a round bar steel or a steel pipe. It is difficult to scan along the surface,
Moreover, since the scanning distance is long, fatigue is severe and the scanning pitch of the probe head may become rough due to fatigue, so that the probe head is not reliably scanned over the entire metal rod-shaped material and internal defects of the metal rod-shaped material It had the drawback of sometimes overlooking.

Further, since the probe head is manually scanned, the scanning speed of the probe head in the longitudinal direction of the metal rod-shaped material is not constant, so flaw detection data is continuously recorded on a recording paper or the like. However, it is necessary to constantly monitor the cathode ray tube of the ultrasonic flaw detector because the correspondence between the defect occurrence position on the recording paper and the actual defect occurrence position on the metal rod-shaped member cannot be accurately grasped. Therefore, eye fatigue is severe, which may cause oversight of internal defects of the metal rod-shaped material.

The present invention has been made to solve the above-mentioned drawbacks, and enables automatic scanning of a probe head having an ultrasonic probe incorporated therein, whereby a metal round bar or metal tube is provided. It is an object of the present invention to provide an ultrasonic inspection apparatus for a metal rod-shaped material, which can surely and accurately inspect the metal rod-shaped material by ultrasonic flaw detection without overlooking defects.

[0009]

In order to achieve the above object, an ultrasonic inspection apparatus for a metal rod-shaped material according to the present invention comprises:
A rod-shaped member rotating device for supporting a metal rod-shaped member such as a metal round bar or a metal tube to be ultrasonically inspected in a horizontal posture and rotating it around an axis, and a longitudinal direction of the rod-shaped member to be inspected above the rod-shaped member rotating device. A horizontal arm suspended reciprocally on a wire rope stretched substantially horizontally in line with the direction, and a vertical arm vertically movably connected to the horizontal arm and biased downward by a biasing member. An arm and a probe head attached to the upper and lower arms and arranged on the outer peripheral surface of the rod-shaped member to be inspected are provided. The probe head is an ultrasonic probe, and the ultrasonic probe. A probe mounting frame in which a contact medium supply port for supplying a contact medium is provided in a gap between the child and the outer peripheral surface of the rod-shaped member to be inspected, and a probe mounting frame body disposed on the outer peripheral surface of the rod-shaped member to be inspected. When contacted with the rod to be inspected, A plurality of freely rotatable copying rollers that support the child attachment frame, the copying rollers having central axes parallel to each other and an inclination angle with respect to the longitudinal direction of the rod-shaped member to be inspected. It is characterized by being arranged.

[0010]

When the rod-shaped member to be inspected is horizontally rotated about its axis by the rod-shaped member rotating device, the probe head is
A horizontal arm is provided which has center rollers parallel to each other and has an inclination angle with respect to the longitudinal direction of the rod to be inspected. Since it is supported by the arm so as to be freely movable in the longitudinal direction of the rod-shaped material to be inspected, the outer circumference of the rod-shaped material to be inspected is determined according to the inclination angle given to the copying roller and the rotation speed of the material to be inspected. It runs on the surface at a constant speed along its length. Further, since the vertically movable arm is urged downward by the urging member, even if the rod-shaped member to be inspected is bent, the probe head of the probe head has an axial center. Following the bending of the rod to be inspected that is rotating around, it is abutted on the outer peripheral surface of the rod to be inspected without floating, and the outer peripheral surface of the rod to be inspected is stably scanned along the longitudinal direction. To be done.

[0011]

EXAMPLES The present invention will be described below based on examples. FIG. 1 is a diagram showing the overall configuration of an ultrasonic inspection apparatus for metal rod-shaped materials according to an embodiment of the present invention, and FIG. 2 is a main part A of FIG.
It is explanatory drawing seen from the arrow direction.

In FIG. 1 and FIG. 2, reference numeral 1 denotes a rack mounted on the floor so as to face each other in a fence shape, and two rod-shaped member rotating devices 2 and 3 face each other with the rack 1 interposed therebetween. Are arranged. The rod-shaped material rotating devices 2 and 3 include a pair of rotating rollers 2a and 3a which are moved up and down by hydraulic pressure and rotated by an air motor.
In order to support the round steel bars M to be inspected, which are to be ultrasonically inspected, which are horizontally arranged on the pedestal 1 at the portions near both ends thereof and lifted up from the gantry 1 to rotate about the axis. belongs to.

Further, two supporting columns 4 and 5 facing each other with the rod-shaped material rotating devices 2 and 3 interposed therebetween are erected.
In the meantime, the wire rope 6 is stretched substantially horizontally so that the inspected round steel bar M is aligned with the longitudinal direction of the inspected round steel bar M when it is set on the rod-shaped member rotating devices 2 and 3. .. A horizontal arm 7 is suspended from the wire rope 6 so as to be capable of reciprocating along the wire rope 6.

The horizontal arm 7 is reciprocally supported by the wire rope 6 and, as shown in the figure, a rotary roller 7b for lightly sandwiching the wire rope 6 from above and below the horizontal plate 7a. A plurality of roller support plates 7c that rotatably support the roller and two vertically extending guide pipes 7d that extend downward with a stopper removably attached to the tip are fixed to each other.

The horizontal arm 7 is connected to a vertically extending vertical arm 8 which is vertically movable by freely penetrating the two vertical guide pipes 7d into its through holes. The upper and lower arms 8 are coil springs 9 as biasing members provided along the two upper and lower guide pipes 7d of the horizontal arm 7, respectively.
The probe head 10 arranged on the outer peripheral surface of the round bar steel M to be inspected is attached to the tip end of the upper and lower arms 8 by means of the above.

Next, the structure of the probe head 10 will be described below. FIG. 3 is a perspective view of the probe head according to the present invention, and FIG.
FIG. 6 is a diagram for explaining the operation of the probe head according to the present invention. In FIG. 3, 11 is a box-shaped acrylic resin probe mounting frame having no bottom surface, 12 is an ultrasonic probe for vertical flaw detection, and 13a and 13b are three sets of oblique angles. It is an ultrasonic probe for flaw detection.

The vertical ultrasonic probe 12 and the oblique-angle ultrasonic probes 13a and 13b are provided on the upper surface of the probe mounting frame 11 and their ultrasonic emission surfaces are the outer circumference of the round bar M to be inspected. The vertical ultrasonic probe 12 is disposed along the longitudinal direction of the round steel bar M to be inspected so as to have a gap with respect to the surface. Reference numeral 14 is a water supply port for supplying water as a contact medium into the gap between the ultrasonic wave emitting surfaces of these ultrasonic probes 12, 13a, 13b and the outer peripheral surface of the round steel bar M to be inspected. In addition, concave curved surface portions corresponding to the outer peripheral convex curved surface shape of the round bar steel M to be inspected are formed in portions of both end surfaces of the probe mounting frame 11 facing the round bar steel M to be inspected. A water hose (not shown) is connected to the water supply port 14.

Reference numeral 15 is a copying roller support plate in which a concave curved surface portion corresponding to the outer peripheral convex curved surface shape of the round bar steel M to be inspected is formed in a portion facing the round bar steel M to be inspected. The copying roller support plate 15 is provided with a pair of copying rollers 16a provided so as to abut on the outer peripheral surface of the round bar steel M to be inspected at intervals of a size shorter than the diameter of the round bar steel M to be inspected. 16b is rotatably supported. Similarly, the other copy roller support plate
A pair of two copying rollers 18a and 18b are also rotatably supported on the 17 as well.

One copy roller support plate 15 having the pair of copy rollers 16a and 16b is provided on one end face of the probe mounting frame 11 with a surface in a direction orthogonal to the longitudinal direction of the round steel M to be inspected. Pitch adjusting member to make an inclination angle θ with respect to
It is fixed across 19 (see Fig. 4).

On the other end surface of the probe mounting frame 11, another copy roller support plate 17 having a pair of copy rollers 18a and 18b is parallel to the copy roller support plate 15 and It is fixed by sandwiching the pitch adjusting member 20 so as to form an inclination angle θ with respect to the surface of the round steel M to be inspected in the direction orthogonal to the longitudinal direction (see FIG. 4). That is, the four copying rollers 16a, 16b, 18a, 18b that are in contact with the round bar M to be inspected and support the probe mounting frame 11 when arranged on the outer peripheral surface of the round bar M to be inspected are The respective central axes are arranged in parallel with each other and at an inclination angle θ with respect to the longitudinal direction of the round steel bar M to be inspected.

Then, an ultrasonic sound absorbing sheet 21 having a predetermined width made of, for example, a sheet-shaped urethane rubber or the like is attached to both sides of the probe mounting frame 11 so as to extend along the longitudinal direction of the round bar M to be inspected. Has been. When performing bevel flaw detection with the bevel ultrasonic probe 13a, 13b, a water supply port
The flow of water as a contact medium which is supplied from 14 and flows along the outer peripheral surface of the round bar M to be inspected is disturbed, so that an ultrasonic echo is easily generated due to the disturbance of the water flow, and the surface layer of the round bar M to be inspected It may not be possible to discriminate between the defect echo and the echo due to the disturbance of the water flow. The ultrasonic sound absorbing sheet 21 is for adjusting the flow of water and preventing the generation of echoes due to the disturbance of the water flow.

The probe head 10 thus constructed is attached to the tip of the upper and lower arms 8 and placed on the outer peripheral surface of the round bar M to be inspected. The signal cable 22 of the ultrasonic probes 12, 13a, 13b of the probe head 10
1, is connected to the ultrasonic flaw detector 23 via a pulley hung on the wire rope 6 so as to reciprocate. The flaw detection data obtained by the ultrasonic flaw detector 23 is recorded by the recorder 24.

Next, the operation of this embodiment will be described with reference to FIGS. First, one round bar steel M to be inspected arranged horizontally on the pedestal 1 is supported in a horizontal position by the rotating rollers 2a and 3a of the rod-shaped material rotating devices 2 and 3 and lifted from the pedestal 1, The probe head 10 is arranged and set on one end of the round steel bar M, for example, on the left end in FIG.

Rotating rollers 2a of the rod-shaped material rotating devices 2 and 3,
When the round bar M to be inspected is rotated clockwise as viewed from the direction of arrow A by driving 3a, the probe head 10 has, as shown in FIG. Copying roller 16 forming an inclination angle θ with respect to the longitudinal direction of the inspection round steel bar M
a, 16b, 18a, 18b, and a horizontal arm 7 suspended reciprocally on the wire rope 6 and an upper and lower arm 8 connected to the horizontal arm 7 for freely moving in the longitudinal direction of the round steel bar M to be inspected. Since it is supported so as to obtain, according to the inclination angle θ given to the copying rollers 16a, 16b, 18a, 18b and the rotation speed of the round bar M to be inspected, the outer peripheral surface of the round bar M to be inspected is shown in FIG. And, the vehicle runs to the right in FIG. 4 at a constant speed. When the round steel bar M to be inspected is rotated counterclockwise when viewed from the direction of the arrow A, the probe head 10 reversely moves as shown in FIG.
And, it will be self-propelled to the left in FIG.

In this case, since the vertically movable arm 8 is urged downward by the coil spring 9, even if the round bar M to be inspected is bent, the probe head 10 is , The copying rollers 16a, 16b, 18a, 18b follow the bending of the inspected round steel bar M rotating around the axis and are brought into contact with the outer peripheral surface of the inspected round steel bar M without floating. The outer peripheral surface of the round steel bar M to be inspected is stably scanned along the longitudinal direction.

The ultrasonic probes 12, 13a, 13 of the probe head 10 which is self-propelled on the outer peripheral surface of the rotating round steel bar M to be inspected.
The echo signal from b is displayed on the cathode ray tube of the ultrasonic flaw detector 23 and recorded in the recorder 24 as flaw detection data. In this case, unlike the case where the probe head 10 is manually scanned, the probe head 10 scans the outer peripheral surface of the inspected round steel bar M at a constant speed. However, it is possible to accurately know the correspondence relationship between the defect occurrence position on the recording paper and the actual defect occurrence position on the inspected round steel bar M.

The probe head 10 is a round steel bar M to be inspected.
When reaching the left end of the, the rotation of the inspected round steel bar M by the rod-shaped material rotating devices 2 and 3 is stopped. After the rotation is stopped, the round bar steel M to be inspected whose ultrasonic flaw detection is finished is
The rotating rollers 2a, 3a of 3 are lowered so that the pedestal 1
It is put down and its end is aligned by the material end aligning roller 25. The above procedure is repeated to sequentially inspect each round steel bar to be inspected by ultrasonic flaw detection.

As described above, the ultrasonic probes 12, 13a, 13
The probe head 10 provided with b can be stably and automatically scanned along the longitudinal direction on the outer peripheral surface of the round steel bar M to be inspected which is rotated around the axis. As a result, the defect of the inspected round steel bar M caused by fatigue caused by manually scanning the probe head is eliminated, and the inspection of the inspected round steel bar M by ultrasonic flaw detection is surely and accurately performed without overlooking the defect. Can be done.

In the above embodiment, the object to be inspected is round bar steel, but it can also be applied to steel pipes, for example. When the inspection target is a metal pipe such as a steel pipe, the ultrasonic probe for vertical flaw detection may not be used.

[0030]

As described above, in the ultrasonic inspection apparatus for a metal rod-shaped material according to the present invention, a probe head having an ultrasonic probe has central axes parallel to each other and a metal rod or It is equipped with a plurality of freely rotatable copying rollers that make contact with the outer peripheral surface of the metal rod-shaped material at an inclination angle with respect to the longitudinal direction of the metal rod-shaped material such as metal pipes to be ultrasonically inspected, and reciprocate on the wire rope. A horizontal arm movably suspended and an upper and lower arms vertically movably connected to the horizontal arm are supported so as to be freely movable in the longitudinal direction of the metal rod-shaped member. Therefore, according to the ultrasonic inspection apparatus for a metal rod-shaped material according to the present invention, the probe head is stabilized along the longitudinal direction on the outer peripheral surface of the metal rod-shaped material which is rotated around the axis by the rod-shaped material rotating device. It is possible to automatically scan, and the defect of the metal rod-shaped material due to fatigue caused by manually scanning the probe head is not overlooked, and the inspection by ultrasonic flaw detection of the metal rod-shaped material is ensured without overlooking the defect. And it can be done accurately.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of an ultrasonic inspection apparatus for a metal rod-shaped material according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a main part of FIG. 1 viewed from a direction of an arrow A.

FIG. 3 is a perspective view of a probe head according to the present invention.

FIG. 4 is a diagram for explaining the operation of the probe head according to the present invention.

FIG. 5 is a diagram for explaining a state of a conventional ultrasonic inspection of a round bar steel by hand.

FIG. 6 is a diagram showing how a probe head is scanned manually by a conventional ultrasonic inspection of round bar steel.

[Explanation of reference signs] 1 ... Stand 2, 3 ... Rod-shaped material rotating device 2a, 3a ... Rotating roller 4, 5 ... Strut 6 ... Wire rope 7 ... Horizontal arm
7a ... Horizontal plate 7b ... Rotating roller 7c ... Roller support plate 7d
… Vertical guide pipe 8… Vertical arm 9… Coil spring
10 ... Probe head 11 ... Probe mounting frame 12 ... Vertical ultrasonic probes 13a, 13b ... Oblique angle ultrasonic probe 14 ... Water supply port 15, 17 ... Copy roller support plate 16
a, 16b, 18a, 18b ... Copying rollers 19, 20 ... Pitch adjusting member 21 ... Ultrasonic sound absorbing sheet 22 ... Signal cable 23
… Ultrasonic flaw detector 24… Recorder M… Inspected round steel bar θ…
Tilt angle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazufusa Miyagaki 2-3-10-301 Konan-cho, Higashinada-ku, Kobe (72) Inventor Tatsuo Eida 1-4-10, Honcho, Hyogo-ku, Kobe (72) Inventor Naoki Inoue 1-20-14 Hiyodoridai, Kita-ku, Kobe

Claims (1)

Claim: What is claimed is: 1. A rod-shaped member rotating device for supporting a metal rod-shaped member to be ultrasonically inspected, such as a metal round bar or a metal tube, in a horizontal posture and rotating the rod-shaped member around the axis, and rotating the rod-shaped member. A horizontal arm that is movably reciprocally hung on a wire rope that is stretched substantially horizontally in the upper direction of the device in conformity with the longitudinal direction of the rod to be inspected, and is connected to the horizontal arm so as to be vertically movable. The probe head includes an upper and lower arm that is urged downward by an urging member, and a probe head that is attached to the upper and lower arm and is arranged on the outer peripheral surface of the rod-shaped member to be inspected. An ultrasonic probe, and a probe mounting frame body provided with a contact medium supply port for supplying a contact medium to a gap between the ultrasonic probe and the outer peripheral surface of the rod-shaped member to be inspected, When placed on the outer peripheral surface of the rod to be inspected And a plurality of rotatable copying rollers that are in contact with the rod-shaped member to be inspected and that support the probe mounting frame, wherein the copying rollers have central axes parallel to each other and An ultrasonic inspection apparatus for a metal rod-shaped material, which is arranged at an inclination angle with respect to the longitudinal direction of the rod-shaped material to be inspected.