JPH0610316Y2 - Probe support device for ultrasonic flaw detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a probe supporting device in an ultrasonic flaw detector for performing flaw detection on a welded portion of an electric resistance welded steel pipe, that is, a large-diameter straight seam welded steel pipe. The present invention relates to a probe supporting device for holding a pair of left and right probes in a V shape and injecting ultrasonic beams obliquely to each other to a steel pipe to inspect a welded portion.

<Prior art> Generally, when inspecting a welded portion of a large-diameter steel pipe such as an electric resistance welded steel pipe, several probes have been conventionally used, and the probe is installed at symmetrical positions with the welding surface sandwiched, The method of continuously detecting flaws by the method is adopted (for example, Japanese Utility Model Publication No. 54-27997).

<Problems to be Solved by the Invention> However, the conventional probe holding device employs a gimbal mechanism in order to obtain the copying characteristics of the steel pipe and the probe, and travels on the steel pipe surface. In this case, since the gimbal mechanism has a large degree of freedom in the scanning ability in the tube axis direction, the ultrasonic beam emitted from the probe is incident at an angle, so the reproducibility of the reception sensitivity level for detecting defects is poor. There is a problem. Therefore, the reliability of the inspection result is low and the yield of the steel pipe is reduced.

According to the present invention, the holder for holding the probe can be fixed immovably in the tube axial direction, and can be easily adjusted to any position in the tube circumferential direction through the joint so as to reproduce the defect detection. It is an object of the present invention to provide a probe support device in an ultrasonic flaw detection device that can provide excellent properties.

Another object of the present invention is to obtain a fitting property of the probe supporting device for a steel pipe and to obtain a circumferential copying property of the steel pipe so that a stable ultrasonic beam is always incident on the welded portion. An object of the present invention is to provide a probe support device in an ultrasonic flaw detector that can be used.

<Means for Solving the Problem> The present invention provides orthogonal parallel mounting boards at the front and rear positions of the central portion of a vertical support that is mounted on an assembler such as a suspended seam tracking device. Circular guide slots are formed on both the left and right sides, and support bolts projecting from the front and back of a pair of V-shaped probe holders are inserted into and supported by the guide slots. A probe box in which a tip of an adjusting screw shaft screwed into a female screw portion arranged on the outside of the mounting substrate is freely connected to the side portion, and a probe shoe or a bellows flam is attached to the lower ends of both holders. The probe supporting device is provided with.

Further, a center roller that runs on the welding surface is provided at the lower end of the support, and a shock absorber mechanism is provided at the end of the mounting shaft of the center roller, and the height and width can be freely adjusted on the left and right outer sides of the mounting substrate. It has a guide wheel attached.

<Operation> Due to the configuration as described above, the center of the lower end of the probe supporting device suspended by the seam tracking device is arranged directly above the welding bead surface, and at the symmetrical position with the welding surface as the center. , The probe shoe at the end of the probe box at the lower end of the probe holders arranged on both sides of the mounting substrate orthogonal to the support, or the bellows, contacts the inspected material so that it has a predetermined inclination angle. Then, in this state, the seam tracking device follows the seam of the welding surface with the detection means such as a television camera to perform flaw detection work.

Also, if you turn the handle located on the outer end of the mounting board and extend or retract the adjustment screw shaft that is integral with this, the holder connected to the tip will move this support bolt along the arc-shaped guide slot. By moving left and right and moving the holder with a predetermined inclination, it is possible to obtain a simple and reliable inclination angle, and it is possible to perform flaw detection that matches the outer diameter and wall thickness of the steel pipe. Also, by using the bellows flam instead of the shoe for the probe,
It is possible to easily obtain a reliable inclination angle without the need to change the outer diameter of the steel pipe.

<Embodiment> The present invention is described below with reference to the drawings of the embodiments.

1 and 2 show a probe support device in which a steel pipe is used at high temperature and a shoe uses a metal shoe, and 1 is a seam tracking device.
A vertical support body suspended by an assembler such as 26 is provided with parallel mounting base plates 2 at the lower front and rear positions of the support base 1, and a pair of arc-shaped guide slots 3 on the left and right sides of the mounting base plate 2, respectively. Three
The support bolts 5 and 5 projecting from both ends of the pair of probe holders 4 and 4 through the guide elongated holes 3 and 3 facing each other, and the nuts 5a and 5a are attached to the support bolts 5 and 5, respectively. Screw and lock. In addition, the female screw portion 8 of the support piece 7 which is extended to the outer end portions of the mounting substrates 2 and 2 in the receiving groove 6 formed on the outer side of each holder 4.
Link ball 10 placed at the tip of the adjusting screw shaft 9 that is screwed into
Is guided and a spindle 11 orthogonal to the link ball 10 is arranged to form a universal joint. Reference numeral 12 is a probe box provided at the end of the shaft portion 4a protruding from the lower end of the holder 4, and a probe shoe 13 which is in sliding contact with the steel pipe A is attached to the lower end of the probe box 12. 14 is an adjustment nut for raising and lowering the probe box 12 arranged on the top of the probe box 15
A spring interposed between the holder 4 and the holder 4, and a bracket 16 inserted in the sleeve 1a provided at the lower end of the central support 1
A center roller attached to the end 17 has a shock absorber mechanism 18 made of a spring at the base, and guide wheels 19 in contact with the steel pipe A on the left and right sides of the mounting substrate 2. The guide wheel 19 is attached to the lower end of a screw shaft 21 that is screwed into brackets 20 projecting from both sides, and can be adjusted up and down by an adjusting screw 22 according to the outer diameter and wall thickness of the steel pipe, and can be moved to the left and right. The width is adjusted by an adjusting screw 24 provided on a horizontally mounted screw shaft 23, and constitutes a probe supporting device 25 as a whole. Reference numeral 29 is a pointer for visually confirming that the supporting device 25 is traveling on the welding surface.

Next, the operation will be described. The support 1 is attached to a known seam tracking device 26 that follows the seam of the welded surface B of the steel pipe A by a detection means such as a television camera, and the center roller 16 located directly below the support 1 is attached. The supporting device 25 is placed on the steel pipe so that the welding device 23 matches the welding surface 23. Further, the four guide wheels 19 on the left, right, front and rear of the mounting substrates 2 and 2 are brought into contact with the surface of the steel pipe A, and the pair of probe holders 4 and 4 sandwiched between the mounting substrates 2 and 2 have probes. Tactile box 12, 12-end probe shoe 13, 13
To the surface A of the steel pipe, and the probe 12 inside the probe box 12, 12
The inclinations of the holders 4 and 4 are set so that the ultrasonic beams emitted from a and 12a have a predetermined incident angle. This inclination angle setting moves the holder 4 back and forth along the arcuate guide elongated hole 3 of the mounting substrate 2. That is, the handle 28 of the adjusting plate 27 at the outer end position of the mounting substrate 2 is turned, the adjusting screw shaft 9 is extended back and forth with the fixed side supporting piece 7 as a base point, and the holder 4 at the tip thereof is moved left and right.

In this state, by moving the seam follower 26 so that the center roller 16 does not shift the position of the welding surface B, an ultrasonic beam is emitted from the pair of probes 12a, 12a arranged in the V shape described above. It is used for flaw detection on the bead surface.

When the outer diameter and wall thickness of the steel pipe to be inspected are different, the inclination angle of the probe holder must be adjusted. In that case, the handle 28 is turned to adjust the adjustment screw shaft 9 of the holder 4. The angle of refraction can be easily adjusted by rotating and moving the holder 4 along the arcuate guide elongated hole 3 by feeding the adjusting screw shaft 9.

FIG. 3 shows another embodiment of the probe supporting device used when the steel pipe A is a cold pipe. In this case, the probe shoe 13 attached to the lower end of the probe box 12 has the structure of a rubber bellows flam 13 '. The holder 4 is supported by guiding the support bolt 5 through the arcuate guide elongated hole 3 formed in the mounting substrate 2 and moving the holder 4 by feeding out the adjusting screw shaft 9 connected to the side portion to obtain a predetermined refraction angle. This is the same as the above-mentioned embodiment, but in this embodiment, the seam tracking device 26 is mounted on a rail (not shown) laid parallel to the steel pipe A and moves.

<Effects of the Invention> As described above, the probe supporting device in the ultrasonic flaw detector of the present invention is provided with parallel mounting substrates at the front and rear positions of the central portion of the vertical supporting body, and V is provided on both left and right sides of the mounting substrate. A holder equipped with a pair of probes arranged in the shape of a letter is respectively supported in arcuate guide elongated holes of a mounting substrate orthogonal to the support body, and an adjustment screw shaft that can be freely extended from the side is attached to the holder. Since they are connected, the inclination of the probe in the tube axis direction is forcibly controlled, preventing the ultrasonic beam from being incident at an angle as in the conventional case, and freeing the tracking property in the tube circumferential direction. The reproducibility of the defect detection can be obtained in combination with the high degree of accuracy.

Also, even if the outer shape and wall thickness of the steel pipe are changed, it is not necessary to remove the entire holder to correct the probe position as in the conventional case, and simply adjust the adjustment screw shaft extending laterally of the mounting board. Just by paying out each by rotating the handle,
Since the holder itself moves and inclines, not only can the adjustment according to the material to be inspected be performed easily, but also the desired setting work becomes easy.

In addition, a shock absorber mechanism is provided at the base end of the mounting shaft of the center roller provided on the lower surface of the support, and guide wheels with adjustable height and width are attached to the left and right sides, so that it is easy to fit steel pipes. In addition to the above, it is possible to obtain the profiling property in the circumferential direction of the steel pipe, and it is possible to always obtain stable incidence of the ultrasonic beam.

Furthermore, by attaching the bellows to the probe box instead of the probe shoe, it is not necessary to reassemble the shoe by changing the outer shape of the steel pipe, and workability is improved.

Further, since the present invention has a simple structure in which the probe holder is interposed between the guide elongated holes of the sandwiching type mounting substrate, the structure of the supporting device itself is not complicated, and vibrations during traveling are not affected. Even if it does not change, accurate flaw detection work can be performed.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a partially cutaway front view, FIG. 2 is a side view, and FIG. 3 is a partially cutaway front view of another embodiment. 1 ... Support, 2 ... Mounting substrate 3 ... Arc-shaped guide slot 4 ... Probe holder 5 ... Support bolt, 9 ... Adjusting screw 10 ... Link ball, 12 ... Probe Box 13, 13 '…… Probe shoe 26 …… Seam tracking device, A …… Steel pipe B …… Welding surface

Claims (3)

[Scope of utility model registration request] 1. A parallel mounting board is provided at a front and rear position of a central portion of a vertical support mounted on an assembler such as a seam follower, and circular guide slots are formed on both left and right sides of the mounting board, respectively. Adjusting screw shafts are inserted into both guide slots and projecting support bolts at the front and rear of a pair of probe holders, and at the side portions of the holders, female screw portions arranged on the outer end of the mounting substrate. A probe supporting device in an ultrasonic flaw detector, which includes a probe box in which probe tips are freely connected and probe shoes are attached to the lower ends of both holders. 2. A center roller that runs on the welded surface of the material to be inspected is provided at the lower end of the support, and a shock absorber mechanism is provided at the base end of the mounting shaft of the center roller, and the shock absorber mechanism is provided on each of the left and right outer sides of the mounting substrate. The probe supporting device in the ultrasonic flaw detector according to claim 1, wherein a guide wheel whose height and width are adjustable is attached. 3. A probe supporting device in an ultrasonic flaw detector according to claim 1, wherein a probe box equipped with a bellows is attached to a lower end of the probe holder.