JPH09229919A - Instrument for measurement of scanning distance in 2-directional flaw detection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device wherein 2-directional scan distance of an ultrasonic sensor is measured accurately and smoothly in ultrasonic flaw detecting. SOLUTION: In the entire periphery at both side part of scanning direction detection tires 1 and 1', guide balls 2 and 2' for sliding are inserted, and, holding frames 5 and 5' which rotatively support the tires 1 and 1' and pipe curved surface tracking frames 8 and (8') which support them while oscillation is allowed are engaged each other with four sets of springs 9 and 9' while restoration is possible, and, the tracking frames 8 and (8') are supported with supporting frames 111 and 111' while pressing is allowed with four sets of springs 101 and 101', thus, a flaw detection scanning distance detecting mechanism part in the pipe axis direction and pipe circumference direction is constituted. Then, the flaw detection scanning distance detecting mechanism part is orthogonally arranged at the central part of an ultrasonic sensor 17 so that a flaw detection scanning distance meter of 2-directional is formed. Thus, accurate measurement of scanning distance of the ultrasonic sensor 17 at a bend pipe part, which was impossible with a conventional device, becomes possible, and wear of the tires 1 and 1' orthogonal to the scan direction is prevented and sliding resistance is reduced, for smooth measurement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-way flaw detection scanning rangefinder applied to an ultrasonic flaw detection device.

[0002]

2. Description of the Related Art Detection of defects in a welded portion of a pipe is performed by using FIG.
As shown in (1), the wall surface of the pipe 01 is scanned by the ultrasonic sensor 02, and the ultrasonic wave 03 transmitted to the inside of the pipe is received by the reflected wave from the welded portion 04, and its size and position are detected.

The scanning of the ultrasonic sensor 02 is shown in FIG.
As shown in (b) and (c), it may be performed in the pipe axis direction (Y direction) of the pipe 01 or in the pipe circumferential direction (X direction). Sound wave sensor 0
A distance meter for measuring the moving distances of the X and Y directions of 2, that is, the two-way flaw detection scanning distance is attached.

A conventional range finder for measuring a moving distance of an ultrasonic sensor in XY directions is a trackball type range finder (similar to a mouse used for operating a personal computer),
This was attached to the position of the ultrasonic sensor 02 in the X direction or the Y direction.

[0005]

In the conventional rangefinder, as described above, the X-axis of the ultrasonic sensor is provided with a certain interval provided therebetween.
It is mounted in the Y direction or the Y direction, and the moving distance of the ultrasonic sensor was obtained from the moving distance measured by the range finder.
I could not measure the distance accurately.

For example, when the distance meter 05 is arranged in the tube axis direction of the ultrasonic sensor 02 as shown in FIG. 7A, an error occurs because the distance meter 05 draws an elliptical orbit during circumferential flaw scanning. It was happening.

Further, as shown in FIG. 7B, when the distance meter 05 is arranged in the circumferential direction of the ultrasonic sensor 02, the ultrasonic sensor 02 and the distance meter 05 are different from each other during flaw detection in the pipe axial direction. There was an error because the orbit moved. The present invention seeks to solve the above problems.

[0008]

In the two-direction flaw detection scanning rangefinder according to the invention described in claim 1, the extension lines of the respective center lines are arranged in the ultrasonic sensors so that they extend at right angles to each other. Formed by flaw detection scanning distance detection mechanism parts for pipe axis direction and pipe circumference direction, each flaw detection scanning distance detection mechanism part has a guide ball inserted so that it can roll around the entire circumference of both sides A tire, a holding frame that rotatably supports the tire, a tracking frame that rotatably supports the holding frame and four sets of tension coil springs are reversibly engaged with the holding frame, and the following motion The frame is characterized in that it is provided with a support frame that is supported by four compression coil springs so as to be capable of being pressed and that is joined to the ultrasonic sensor.

When ultrasonic flaw detection of a pipe is performed using an ultrasonic sensor provided with a two-way flaw detection scanning distance meter according to the present invention, when the ultrasonic sensor is set on the wall surface of the pipe, each flaw detection scanning distance detection mechanism unit is installed. The following frame is pressed by four sets of compression coil springs, and the respective tires come into contact with the pipe wall surface.

When the scanning of the ultrasonic sensor is started in this state, the tire of the flaw detection scanning distance detection mechanism portion facing the scanning direction rotates, but the tire of the flaw detection scanning distance detection mechanism portion positioned in the direction orthogonal to the scanning direction. Is inclined due to sliding resistance with the pipe wall surface, the guide ball on the scanning direction side comes into contact with the pipe wall surface to roll (or slide), and when the scanning is stopped, the tension coil spring restores the tire inclination. .

The rotation angle of the tire of the flaw detection scanning distance detecting mechanism portion facing the scanning direction is detected, the rotation angle is converted into the distance, and the scanning distance at the time of scanning by the ultrasonic sensor is measured.

In the present invention, the scanning distances in the tube axis direction and the tube circumferential direction are flaw detection scanning distance detecting mechanisms for the tube axis direction and the tube circumferential direction in which the extension lines of the center lines of the ultrasonic sensors are orthogonal to each other. Since the measurement is performed by each unit, it is possible to prevent the measurement error in the curved pipe unit that occurs in the conventional device.

Further, since the tire orthogonal to the scanning direction of the ultrasonic sensor is inclined and the guide ball is brought into contact with the wall surface of the pipe, it is possible to prevent wear of the tire and reduce sliding resistance, and smooth measurement is possible. .

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A two-direction flaw detection scanning rangefinder according to an embodiment of the present invention will be described with reference to FIGS. Note that FIG. 1 is an arrow view of a state in which the rangefinder according to the present embodiment is inverted.

The rangefinder according to the present embodiment shown in FIGS. 1 to 5 is composed of a flaw detection scanning distance detection mechanism portion for the pipe axis direction and a flaw detection scanning distance detection mechanism portion for the pipe circumferential direction, both of which are provided. The extension lines of the respective center lines are connected to the ultrasonic sensor unit so that the extension lines are orthogonal to each other at the center of the ultrasonic sensor unit.

As shown in FIGS. 1 to 4, the flaw detection scanning distance detecting mechanism portions for the pipe axis direction and the pipe circumferential direction are provided with rubber tires 1 and 1'for detecting the scanning distance, a guide ball 2, respectively.
2 ', rotating rim frames 3, 3', shaft members 4, 4 ', holding frames 5, 5', hinges 51, 51 ', gearbox 6,
6 ', rotation angle detector 7, 7', chasing frame 8,
8 ', collar 81, 81', tension coil spring 9, 9 ',
Pressing guide rods 10 and 10 ', and compression coil spring 1
It is formed by 01, 101 '.

As shown in FIGS. 1 and 3 to 5, the ultrasonic sensor section includes a sensor holding frame 11, a pipe axis direction support frame 111, and a pipe circumferential direction support frame 11.
1 ', guide ball 12, cymbal mechanism frame 13,
The sensor holding member 14, the sensor pressing rod 15, the compression coil spring 16, the ultrasonic sensor 17, and the gas cylinder rod 18 are formed.

The details of the flaw detection scanning distance detecting mechanism portion for the pipe axis direction and the flaw detection scanning distance detecting mechanism portion for the pipe circumferential direction formed by the above members will be described below with reference to FIGS. 1 to 4.

The rubber tires 1, 1'for detecting the scanning distance are rolling (sliding) guide balls for the purpose of preventing wear and reducing sliding resistance of the tires 1, 1'at the time of scanning in the orthogonal direction over the entire circumference of both sides. A plurality of 2, 2'are freely inserted and fixed by a rotating rim frame 3, 3'and rotatably supported by shaft members 4, 4'and holding frames 5, 5'via bearings or the like. There is.

In the shaft members 4 and 4 ', gearboxes 6 and 6'in which shaft cores are connected to the rotary rim frames 3 and 3', respectively.
And rotation angle detectors 7 and 7'are inserted, and shaft members 4 and 4 '
Are inserted and fixed to the holding frames 5 and 5 '.

The holding frames 5 and 5'are supported by the chasing frames 8 and 8'to be slidable (rotatably) eccentrically to the pipe wall surface so that a restoring force works when pressed to the pipe wall surface. 4 sets of hinges 5 protruding to both sides of the holding frames 5 and 5 '
1,51 'and the collar 81,8 of the chasing frame 8,8'
Four sets of tension coil springs 9 and 9'are engaged between 1'to allow restoration.

The following frames 8 and 8'are color 8
Pressing against the support frames 111, 111 'of the sensor holding frame 11 of the ultrasonic sensor unit via the four sets of pressing guide rods 10, 10' inserted and fixed in the 1, 81 'part and the compression coil springs 101, 101', It is supported so that it can be driven.

The details of the ultrasonic sensor portion formed of the above members and coupled to each flaw detection scanning distance detecting mechanism portion will be described below with reference to FIGS. 1 and 3 to 5.
The ultrasonic sensor 17 has four sets of guide balls 12 arranged in a square and is arranged at the central portion of the sensor holding frame 11 which can be aligned in the pipe normal direction.
Cymbal mechanism frame 13 slidable in the pipe circumferential direction
The sensor holding member 14 that can be swung orthogonally to is attached to the pipe wall surface side through four sets of sensor pressing rods 15 and compression coil springs 16.

The sensor holding frame 11 is attached to the tips of two sets of gas cylinder rods 18 partially shown in FIGS. 1 to 3, and the gas cylinder rods 18 press and scan the wall surface of the pipe.

Next, regarding the measurement of the flaw detection scanning distance of the ultrasonic sensor 17 using the two-direction flaw detection scanning distance meter according to this embodiment, the case of the tube axis direction scanning and the case of the tube circumferential direction scanning will be described below. To do.

When scanning the ultrasonic sensor 17 in the tube axis direction (Y direction), the tire 1 arranged in the tube axis direction is grounded at a right angle to the wall surface of the pipe and pressed in the tube axis direction while pressing it. When it is dynamically rotated (arrow a in FIGS. 1 to 3), the rotation is transmitted to the speed increasing gear 6 through the rotating rim frame 3, the rotation angle is measured by the rotation angle detector 7, and converted into a distance. It

At this time, since the tire 1'disposed in the pipe circumferential direction is pressed against the pipe wall surface in a state orthogonal to the scanning direction, the tire 1'is moved to the side opposite to the scanning direction due to the sliding resistance with the pipe wall surface. Swinging and tilting (arrow b in FIGS. 1 to 3) and tilting, and only the guide ball 2 ′ on the scanning direction side rolls (or slides) by contacting the pipe wall surface and sliding resistance of the tire 1 ′. Is reduced. When the scanning movement in the pipe axis direction is stopped, the inclination of the tire 1'is restored by the tension coil spring 9'on the scanning direction side, and the tire 1'is grounded and pressed at right angles to the pipe wall surface.

When the ultrasonic sensor 17 scans in the tube circumferential direction (X direction), the tire 1 arranged in the tube axial direction and the tire 1'arranged in the tube circumferential direction have the opposite actions to the above case. Then, the flaw detection scanning distance in the pipe circumferential direction is measured.

In the present embodiment, as described above, the extension line of the center line is formed by the flaw detection scanning distance detecting mechanism portions for the pipe axis direction and the pipe circumferential direction which are orthogonal to each other at the center of the ultrasonic sensor 17. It has become possible to accurately measure the flaw detection scanning distance in each direction.

[0030]

In the two-way flaw detection scanning rangefinder of the present invention, rolling (sliding) guide balls are inserted around the entire circumference of both sides of the tire for detecting the scanning distance, and used as a holding frame for the rotation bearing of the tire part. It is reproducibly engaged with the tube curved surface follower frame which is swingably supported by four sets of springs, and the follower frame is supported by the support frame so that it can be pressed by four sets of springs. The conventional device is provided with the formed flaw detection scanning distance detection mechanism portions for the pipe axis direction and the pipe circumferential direction, which are arranged orthogonally to the central portion of the ultrasonic sensor to form a two-direction flaw detection scanning distance meter. In this case, it is possible to accurately measure the scanning distance of the ultrasonic sensor in the curved pipe section, which can prevent wear of the tire orthogonal to the scanning direction and reduce sliding resistance. It becomes possible to measure

[Brief description of drawings]

FIG. 1 is a perspective view of a two-way flaw detection scanning rangefinder in an inverted state according to an embodiment of the present invention.

FIG. 2 is a plan sectional view of a flaw detection scanning distance detection mechanism section according to the embodiment.

FIG. 3 is a side sectional view of the rangefinder according to the embodiment.

FIG. 4 is a front view of the distance meter according to the embodiment.

FIG. 5 is a plan view of the distance meter according to the embodiment.

FIG. 6 is an explanatory diagram of scanning by the ultrasonic sensor.

FIG. 7 is an explanatory diagram of measuring a flaw detection scanning distance of a pipe by a conventional device.

[Explanation of Codes] 1,1 'Tire 2,2' Guide Ball 3,3 'Rotating Rim Frame 4,4' Shaft Member 5,5 'Holding Frame 51,51' Hinge 6,6 'Gearbox 7,7 'Rotation angle detector 8,8' Chasing frame 81,81 'Collar 9,9' Tension coil spring 10,10 'Pressing guide rod 101,101' Compression coil spring 11 Sensor holding frame 111,111 'Support frame

Claims (1)

[Claims] 1. A flaw detection scanning distance detection mechanism portion for pipe axis direction and pipe circumferential direction, which is arranged in an ultrasonic sensor such that extension lines of respective center lines are orthogonal to each other at their centers, respectively. The flaw detection scanning distance detection mechanism makes it possible to roll the scanning distance detection tire with guide balls inserted around the entire circumference of both sides, the holding frame that rotatably supports the tire, and the holding frame that can swing. A chasing frame in which four sets of tension coil springs are supported between the supporting frame and the holding frame in a recoverable manner, and the chasing frame is supported in a pressable manner via four sets of compression coil springs and joined to the ultrasonic sensor. Two-way flaw detection scanning rangefinder, which is provided with a supported frame.