JPS60228957A - Apparatus for holding ultrasonic flaw detector for piping - Google Patents

Abstract

PURPOSE:To perform accurate ultrasonic flaw detection with high reproducibility, by making it possible to revolve a bracket and a body to a lever so that the rotary center of a guide plate becomes vertical to the outer peripheral surface of piping to be inspected. CONSTITUTION:Even when the leading end side of a lever 21 is positioned at the bent pipe part 28 of piping 11 to be inspected, the guide plate 37 pressed to the bent pipe part 38 by the spring force of a compression coil spring 20 revolves a bracket 26 and a body 28 so that the contact state to the bent pipe part 38 is made most stable and revolves itself to be closely contacted with the bent pipe part 38. As a result, the posture of the probe 31 to the bent pipe part 38 is constantly held in the same way as that to a straight pipe part 39 and, therefore, the flaw inspection of a welded connection part 40 can be accurately performed with high reproducibility.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a holding device for an ultrasonic flaw detector for piping, which is capable of always holding the flaw detector in a constant position and making it possible to detect deep ultrasonic flaws with high precision.

There are pipes for various plants that flow high-pressure fluids or harmful fluids, and ultrasonic flaw detection is known as one method of defect inspection for welded joints of such highly dangerous pipes. As shown in FIG. 1, which shows the appearance of a conventional ultrasonic flaw detection device for piping, a band rail 102 with a two-sided structure that is detachably fixed to the piping 101 to be inspected so as to surround the piping 101 to be inspected has a , a traveling carriage 103 sliding along the band rail 102 is engaged, and driven rotation of a pinion (not shown) that meshes with a gear 104 formed on the band rail 102 moves the traveling carriage 103 to the inspection target 1.
It is designed to revolve around 01. Traveling trolley 10
3 is provided with an arm rail 105 that extends in a direction perpendicular to the band rail 102, and a slider 106 that reciprocates along this arm rail 105 by a feed drive mechanism (not shown) has a slider 106 that extends in the radial direction of the pipe 101 to be inspected. A proximal end of a lever 107 that can be displaced is pivotally mounted. A gimbal joint 109 is attached to the tip of the lever 107, which is always pressed toward the inspection object 101 via the torsion coil spring 108.
A holder 110 is rotatably held through the holder 110, and a flaw detector (not shown) is fixed to the holder 110 for detecting welding defects and the like in the pipe 101 to be inspected.

Piping 1 to be inspected in such a conventional ultrasonic flaw detection device
Figure 2 (al) showing the flaw detection state of the welded joint in the bent pipe section of No. 01 and Figure 2 (
As shown in bl, the holder 110 is attached to the bent pipe section 111.
The bent pipe portion 111 is bent by the spring force of the coiled spring 108.
Even if the gimbal joint 109 functions so as to be in close contact with the outer circumferential surface of the It becomes impossible to keep the attitude of the flaw detector 112 constant as in the case of the straight pipe section 114. As a result, the accuracy of ultrasonic flaw detection in the curved pipe portion 111 deteriorates, resulting in a drawback that accurate inspection cannot be performed.

In view of the above-mentioned problems with the flaw detector holding mechanism of the conventional ultrasonic flaw detection equipment for piping, the present invention enables accurate inspection of curved pipes by holding the flaw detector in a constant posture in the same way as for straight pipes. The purpose of the present invention is to provide a flaw detector holding device that can perform

The structure of the ultrasonic flaw detector holding device for piping according to the present invention that achieves this object includes a bracket that is rotatably attached to the tip of a lever that can move along the piping to be inspected and is pressed against the piping to be inspected. Then, the bracket moves around an axis perpendicular to the center of rotation of this bracket!・A body rotatably held by the body, a holder which is integrally attached to the body of the second body and to which a flaw detector for ultrasonic flaw detection of the pipe to be inspected is mounted, and a curvature corresponding to the outer periphery of the pipe to be inspected. The guide plate has a circular arc shape and is rotatably held by the body around an axis perpendicular to the center of rotation of the body so as to be in close contact with the outer peripheral surface of the piping to be inspected.

Therefore, according to the present invention, the bracket and the body can be rotated relative to the lever so that the center of rotation of the guide plate is perpendicular to the outer circumferential surface of the pipe to be inspected, and the guide plate is tightly attached to the outer circumferential surface of the pipe to be inspected. Because it can rotate with respect to the body, the flaw detector always maintains a constant posture even if it is pressed against a curved part of the pipe to be inspected, just like a straight pipe, due to the action of the guide plate that is in close contact with the pipe to be inspected. It is possible to perform accurate ultrasonic flaw detection with high reproducibility.

Hereinafter, an embodiment of the ultrasonic flaw detector holding device for piping according to the present invention will be described in detail with reference to FIGS. 3 to 7.

As shown in FIG. 3 showing the external appearance of this embodiment, a two-sided annular band rail 12 is removably attached to the pipe 11 to be inspected, and a traveling trolley 13 is attached to the band rail 12. An arc-shaped connecting link 1 is connected to the traveling trolley 13.
A support 15 integrally connected via 4 is slidably engaged with the support 15 . A band rail 12 is attached to the traveling trolley 13.
A pinion (not shown) that meshes with a gear 16 formed in the figure is rotatably mounted, and the driving rotation of the pinion causes the traveling carriage 13 and the support 15 to revolve around the pipe 11 to be inspected along the band rail 12. A support block 18 is swingably supported on the support 15 via a pin 17 perpendicular to the longitudinal direction of the pipe 11 to be inspected.
The support block 1
A compression coil spring 20 is interposed to keep the front end of the pipe 8 close to the surface side of the pipe 11 to be inspected. Support block 18
A pair of mutually parallel rods 22 having levers 21 protruding from their tips are fitted to be slidable in a direction perpendicular to the pin 17, and are rotatable to the support block 18 parallel to these rods 22. A rod-shaped feed nut 24, which is integral with the rod 22, is screwed onto the feed screw shaft 23 mounted on the rod 22. Therefore, by operating the lever adjustment moke 25 attached to the support block 18, the feed screw shaft 23 is driven to rotate, and the lever 21, together with the rod 22, is moved relative to the support block 18 in a direction parallel to the feed screw shaft 23. Move back and forth. In addition to this embodiment, the mechanism for moving the lever 21 relative to the pipe 11 to be inspected and the mechanism for bringing the lever 21 close to the surface of the pipe 11 to be inspected using a spring force may be appropriately selected from those shown in FIG. 1, for example.

FIG. 4(a) showing the planar shape of the tip of the lever 21, and FIG.
As shown in FIG. 5, which is an enlarged view of the arrow, a two-pronged fork-shaped bracket 26 is attached to the tip of the lever 21, and the bearing 2 is attached to the tip of the lever 21.
An annular body 28 is rotatably supported on the bracket 26 by a bearing 30 via a pair of pins 29 perpendicular to the lever 21 . As shown in FIG. 4 (FIG. 6, which shows the cross-sectional structure in the direction of the Vl-VI arrow in BL), a holder 32 that holds the flaw detector 31 in an inclined state is removably fitted into the body 28, and is compressed. A knock pin 34, which is reciprocatably attached to the body 28 via a coil spring 33, engages with the holder 32, and prevents the holder 32 from being removed from the body 28. Therefore, the knob provided on the knock pin 34 35
By pulling the dowel pin 34 against the holder 32 to the right side in FIG. 6 against the spring force of the compression coil spring 33,
The flaw detector 31 is removed from the body 2 together with the holder 32.
8, allowing flaw detectors with different inclination angles to be quickly replaced. Note that the holder 32
Of course, it is also possible to arrange a plurality of flaw detectors 31 having different inclination angles and use only one arbitrary one of them. A guide plate 37 rotatably supported by the body 28 via a bearing 36 is connected to the pin 2
It rotates around an axis perpendicular to the pipe 9, but has an arc shape with a curvature corresponding to the outer diameter of the pipe 11 to be inspected, so that it can be brought into close contact with the pipe 11 to be inspected.

Therefore, as shown in FIG. 7 showing the working state of this embodiment, the tip side of the lever 21 is connected to the curved pipe portion 3 of the pipe 11 to be inspected.
8, the guide plate 3 is pressed against the curved pipe portion 37 by the spring force of the compression coil spring 20.
7 rotates the bracket 26 and the body 28 so that the contact state with respect to the bent pipe part 38 is most stable, and also rotates itself to come into close contact with the bent pipe part 38.

As a result, the attitude of the flaw detector 31 with respect to the surface of the curved pipe section 38 is maintained constant as in the case of the straight pipe section 39.
Defect inspection of the welded joint 40 can be performed accurately and with high reproducibility.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the external appearance of a conventional ultrasonic flaw detection device for piping, Fig. 2 (a) is a conceptual diagram of the operation showing the state when the flaw detector is positioned in a curved pipe section, and Fig. 2 ( bl is that B-B
3 is a perspective view showing the external appearance of an embodiment in which the ultrasonic flaw detector holding device for piping according to the present invention is applied to an ultrasonic flaw detection device for piping, and FIG. A plan view showing the structure, Fig. 4 (bl is a sectional view taken along the line B-B, Fig. 5 is an enlarged view of the part shown in the The cross-sectional view and Fig. 7 are conceptual diagrams of the work, and in the figures, 11 is the pipe to be inspected, 12 is the band rail, 13 is the running trolley, 15 is the support, 1?, 29 is the pin, and 18 is the support block. , 20 is a compression coil spring, 21 is a lever, 22 is a rod, 25 is a lever drive motor, 26 is a bracket, 27. 30, 36 are bearings, 28 is a body, 31 is a flaw detector, 32 is a holder, 37 is a guide plate Figure 1 (a) Figure 3 Figure 4 (.)

Claims (1)

[Claims] A bracket rotatably attached to the tip of a lever that can move along the piping to be inspected and is pressed against the piping to be inspected; a holder that is integrally attached to the held body and has a flaw detector for ultrasonic flaw detection of the piping to be inspected; An ultrasonic flaw detector holding device for piping, which is equipped with a guide plate rotatably held on the body around an axis perpendicular to the rotation center of the body so as to be in close contact with the outer peripheral surface of the piping to be inspected. .