JP2007132726A - Ultrasonic flaw detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic flaw detector of piping capable of shortening the time required for adjusting the track of the ultrasonic flaw detector in parallel to the center of the welding line in the peripheral direction of the piping. <P>SOLUTION: The ultrasonic flaw detector includes the annular tracks 10a and 10b which surround the piping 50, the fixing bolts for installing the tracks 10a and 10b on the piping 50, a peripheral direction scanning mechanism including the support 58 moving along the tracks 10a and 10b, the axial direction scanning mechanism provided to the support 58 to move a probe holder 72 in the longitudinal direction of the piping 50 and the probe 70 mounted on the probe holder 72 and also includes annular guide rings 20a and 20b arranged so as to surround the piping 50 at the position separated in the longitudinal direction of the piping 50 and integrally attached to the tracks and a pipe 30a1, and other fixing bolts for installing the guide rings 20a and 20b on the piping 50. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ultrasonic flaw detector for performing non-destructive inspection by scanning an object to be inspected with an annular appearance by scanning an ultrasonic probe in an annular direction and a direction perpendicular to the direction.

  As the inspection object having an annular appearance, for example, piping of various outer diameters butt-welded as represented by the primary recirculation piping of the boiling water nuclear power plant is assumed. A butt weld of the pipe is assumed.

  As a conventional technique of an ultrasonic flaw detection apparatus for nondestructive inspection of piping, there is one in which a scanning mechanism that scans an ultrasonic probe in a pipe axial direction and a circumferential direction is moved along a trajectory installed in an annular shape around the outer periphery of the pipe. It is known. A rack (a rack corresponding to the rack and pinion mechanism) for moving the circumferential scanning mechanism in the circumferential direction of the pipe is provided on the outermost periphery of the track, and is a motor attached to the circumferential scanning mechanism. The position of the ultrasonic probe in the circumferential direction of the pipe is changed by meshing the rotationally driven gear with the rack (see, for example, Patent Document 1).

Paragraph Nos. 0023-0056 and FIGS. 1 and 2 in the specification of JP-A-11-160295.

  In ultrasonic flaw detection of pipe welds, the ultrasonic probe is scanned in the pipe axis direction while the ultrasonic beam is incident on the pipe at a predetermined angle from the pipe axis direction with respect to the center of the pipe circumferential weld line. The pipes are inspected for defects by ultrasonic waves.

  Such inspection is repeated by scanning the ultrasonic probe in the circumferential direction, and the inspection is performed over the entire circumference of the weld line in the circumferential direction of the pipe weld. In conventional ultrasonic inspection equipment for pipes, the trajectory for scanning the ultrasonic probe scanning mechanism in the circumferential direction of the pipe may be installed parallel to the center of the circumferential weld line, that is, perpendicular to the central axis of the pipe. Not exactly done. In addition, if the gap between the pipe and the track is strictly managed so as to be installed accurately, it takes time to install the track.

  In addition, since the piping to be inspected is a closed loop, it is required that the ends of two semicircular tracks are mechanically connected or a semicircular track that is completely separated. Since this semicircular track is mechanically fastened as a single track at the location to be inspected, and the piping to be inspected has an outer diameter of about 100 mm to 600 mm, it follows the outer circumference of the piping. This increases the weight and size of the installed track and makes it difficult to handle, and it takes time to accurately set the track of the ultrasonic flaw detector on the pipe.

  In this way, when it takes time to accurately install the trajectory of the ultrasonic flaw detector in the pipe, the pipe is made of radioactive material adhering to the pipe inner surface like the primary recirculation pipe of the boiling water nuclear power plant. When the dose rate of the emitted gamma rays is relatively high, it is desired to shorten the time required for installing the ultrasonic flaw detector on the pipe from the viewpoint of reducing radiation exposure.

  Furthermore, when the scanning range of the ultrasonic probe in the pipe axial direction is large, the track fixed part shift occurs due to the rotational moment of the ultrasonic probe axial scanning mechanism during flaw detection at the lowest point position in the pipe circumferential direction. Reduction is another issue.

  An object of the present invention is to achieve accurate mounting of an ultrasonic flaw detector on a long object to be inspected such as a pipe having a circumferential surface.

  The basic requirements for achieving the above object are: an annular track surrounding the object to be inspected, a fixing means mounted on the track to install the track on the object to be inspected, and moving along the track. A circumferential scanning mechanism, an axial scanning mechanism that moves the probe holder from the circumferential scanning mechanism in a scanning direction perpendicular to the trajectory and along the object to be inspected, and the probe holder. In the ultrasonic flaw detector provided with the probe, an annular guide ring that is disposed so as to surround the object to be inspected at positions separated in the scanning direction and is integrally attached to the track, and the guide It is equipped with a ring and another fixing means for installing the guide ring on the object to be inspected.

  According to the present invention, the trajectory of the ultrasonic flaw detector can be accurately set with as little inclination as possible around the outer periphery of the object to be inspected.

  An annular track having a rack 16 on its outer peripheral surface is constituted by a semicircular arc upper track 10a and a semicircular lower track 10b, and ends of the upper and lower tracks 10a, 10b are connected to each other. It is possible to freely connect and disconnect by means.

  An annular guide ring is provided parallel to the tracks 10a and 10b and concentrically with the ring of the track. The guide ring is divided into upper and lower parts like the track, and is composed of an upper guide ring 20a and a lower guide ring 20b. The ends of the upper and lower guide rings 20a and 20b are the same as the connecting means of the track. The connection means can be freely connected and disconnected.

  The track 10a and the guide ring 20a are formed by connecting the hollow pipes 30a1 to 30a4, which are connecting members, to the track 10a and the guide ring 20a so that relative movement between the track and the guide ring does not occur. Is integrated. The pipes 30a1 to 30a4 are arranged at intervals in the annular direction along the ring of the track.

  The track 10b and the guide ring 20b are formed by connecting the hollow pipes 30b1 to 30b4, which are connecting members, to the track 10b and the guide ring 20b so that relative movement between the track and the guide ring does not occur. Is integrated. The pipes 30b1 to 30b4 are arranged at intervals in the annular direction along the ring of the track.

The connecting means for connecting the ends of the tracks 10a and 10b and the guide rings 20a and 20b includes the rotating rod 41a1, the rotating rod operating lever 40a1 fixedly connected to one end of the rotating rod 41a1, and the connecting end. Each of the tracks 10a and 10b and each guide is formed by rotating the rotary rod operating lever 40a1. The handle 13 is fixed to one of them and the hole 13 is formed at the other end and into which the handle 12 can be inserted. The ends of the rings 20a and 20b can be connected or disconnected simultaneously in a short time.

  Each track 10a, 10b has a fixing means for installing the connected tracks 10a, 10b on a pipe 50 which is an object to be inspected. The fixing means includes a hole 22 penetrating each track 10a, 10b from the inner surface to the outer surface, a female screw formed on the inner surface of the hole 22, and a fixing bolt that is screwed into the female screw and protrudes toward the pipe 50 side. 19a1 to 19b1. Each of the connected guide rings 20a and 20b also has other fixing means for being installed in the pipe 50 that is an object to be inspected. The fixing means includes a hole 22 that penetrates each guide ring 20a, 20b from the inner surface to the outer surface, a female screw formed on the inner surface of the hole 22, and a fixing screw that is screwed into the female screw and protrudes toward the pipe 50 side. It comprises bolts 18a1 to 18b1.

  In any fixing means, the fixing bolts 19a1 to 19b1 and 18a1 to 18b1 are rotated to adjust the protruding amount of the fixing bolt so that the raceway and the guide ring connected to the pipe 50 as much as possible are concentric. By arranging the fixing bolts 19a1 to 19b1 and 18a1 to 18b1 against the outer surface of the pipe 50 from three equiangular intervals, the tracks 10a and 10b and the guide rings 20a and 20b to the pipe 50 are arranged. Fixed installation can be achieved.

  The annular tracks 10a and 10b are equipped with a circumferential scanning mechanism. The circumferential scanning mechanism is supported by a support 58 that is movably installed on the tracks 10 a and 10 b without being dropped by the ball plungers 65 a and 65 b, a motor 60 fixed to the support 58, and rotationally driven by the motor 60. The gear 61 is engaged with the rack 16.

The support 58 is equipped with an axial scanning mechanism. The axial scanning mechanism includes a motor 62 fixed to a support body 58, a gear 63 that is rotationally driven by the motor 62 via a gear train, a rotation center of the gear 63 that is aligned with the rotation center, and a piping. And a ball screw 67 protruding in the length direction of the support body 58 and rotatably mounted on the support body 58, and the ball screw 67 being combined with the ball screw 67 so as to be capable of screw feeding in the length direction of the pipe 50, that is, in the direction perpendicular to the weld line of the pipe. The probe holder 72 and a guide rod 68 that is passed through the probe holder 72 and fixed to the support body 58 so that the probe holder 72 does not rotate together with the rotation of the ball screw 67. Has been. The guide rod 68 is engaged with the probe holder 72 so that the probe holder 72 can slide in the longitudinal direction of the guide rod 68.

  The probe holder 72 is equipped with a probe 70 that transmits and propagates ultrasonic waves into the pipe 50 and receives the reflected waves of the ultrasonic waves. The probe 70 is piped by a spring suspension or the like. The probe 70 is in contact with the pipe 50 at an appropriate surface pressure.

By rotating the gear 61 with the motor 60, the circumferential scanning mechanism can move in the circumferential direction of the pipe 50 along the trajectory, and can achieve circumferential scanning in which the probe 70 is moved in the circumferential direction of the pipe 50. . Further, when the gear 62 is rotated by the motor 62 and the ball screw 67 is driven to rotate, the ball screw 67 moves the probe holder 72 toward or away from the tracks 10a and 10b based on the direction of rotation of the motor 62. An axial scan of moving can be achieved.

  An ultrasonic flaw detector that receives a received signal obtained by transmitting an ultrasonic wave from the probe 70 or receiving an ultrasonic reflected wave and processes the received signal is connected to the probe 70 and used for inspection. It is done. A motor controller is also connected to each of the motors 60 and 62 so that each scanning is possible, and the position of the probe can be specified from the scanning amount.

  In the following, more specific examples of the present invention will be described.

  FIG. 1 is an overall configuration diagram of an ultrasonic flaw detector according to the present invention, FIG. 2 is a side view of only a track and a guide ring as viewed from the guide ring side, and FIG. 3 is a diagram of the ultrasonic probe scanning mechanism shown in FIG. 4 is an enlarged view of the front and side surfaces, FIG. 4 is a cross-sectional view of the pipe ultrasonic flaw detector shown in the embodiment of FIG. 2, viewed from the direction of arrows AA, and FIG. 5 is a semicircular orbit in the embodiment of FIG. FIG. 6 is a diagram showing a guide ring coupling mechanism, FIG. 6 is a diagram showing the relationship between the gripper tool and the rotating rod in FIG. 4, and FIG. 7 is another embodiment of the pipe ultrasonic flaw detector according to the present application.

  The embodiment according to the present application in FIG. 1 shows an installation state of a pipe ultrasonic flaw detector for ultrasonic flaw detection of a weld line 52 of a pipe 50 to be inspected, which is an inspection object. A scanning mechanism in the pipe circumferential direction and the axial direction is mounted, and the probe can be moved in the circumferential direction and the axial direction (longitudinal direction of the pipe) of the pipe 50 by each scanning mechanism.

  An annular orbit required for the movement includes a plurality of pipes 30a1 to 30a4, 30b1 to 30b4, a rotating rod 41a1 and two semicircular orbits 10a and 10b and guide rings 20a and 20b. The rotating rod operating lever 40a1 is fixed to the rotating rod 41a1.

The semicircular track 10a and the guide ring 20a are arranged concentrically, and a plurality of pipes 30a1 to 30a4, and the track 10b and the guide ring 20b are arranged concentrically, and a plurality of pipes 30b1 to 30b1 are arranged. Each of them is mechanically connected and fixed at 30b4. A rack 16 is fixedly attached to the outer peripheral surfaces of the tracks 10a and 10b, and is configured so that a pipe circumferential movement gear 61 provided in the circumferential scanning mechanism meshes to move the circumferential scanning mechanism. ing.

  The rotating rod 41a1 and the rotating rod operation lever 40a1 are formed by connecting the ends of the semicircular track 10a and the track 10b and the guide ring 20a and the guide ring 20b, which are divided into two vertically, with one touch. The guide ring 20a and the guide ring 20b are connected in series in a ring. The tracks 10a and 10b and the guide rings 20a and 20b that are mechanically integrated are fixed to the pipe by inserting an operation jig into a fixing bolt operating hole 22 provided in each of the track and the guide ring. . Details will be described in the description of FIG.

  The probe scanning mechanism includes a motor 60 that scans the probe in the pipe circumferential direction, a motor 62 that scans the probe in the pipe axial direction, an encoder 64 that detects the probe position in the pipe circumferential direction, and a probe. 70, the probe holder 72, and the probe 70 are constituted by a ball screw 67 and a guide rod 68 that scan the pipe 70 in the pipe axis direction.

FIG. 2 is a view of the tracks 10a and 10b and the guide rings 20a and 20b excluding the probe scanning mechanism in FIG. 1 as viewed from the guide ring side. In this embodiment, the semicircular track 10a and the guide ring 20a, and the track 10b and the guide ring 20b are pipes 30a1, 30a2, 30a3, 30a4 and pipes 30b1, 30b2, 30b3, respectively.
The pipes 30a1, 30a2, 30a3, 30a4, 30b1, 30b2, 30b3, and 30b4 are within the range where the mechanical rigidity is maintained. good.

  Also, the raceways 10a and 10b and the guide rings 20a and 20b divided into a semicircular shape are divided into rotary rods 41a1 and 41a2 and rotary rod operation levers 40a1 and 40a2 that are rotatably attached to both ends of the raceway 10a and the guide ring 20a. Are configured to be operated and fixed simultaneously. Further, the guide rings 20a, 20b are fixed to the inspection pipe using fixing bolts 18a1, 18a2, 18a3.

  FIG. 3 is an enlarged view of the probe scanning mechanism of the pipe ultrasonic flaw detector shown in FIG. 1, wherein (a) shows a side view and (b) shows a front view. 3A and 3B, the probe scanning mechanism includes a gear 61 that scans the probe in the circumferential direction and a ball plunger meshed with a triangular groove 11 formed on the side surfaces of the tracks 10a and 10b. It is attached to the track in a form supported by three points 65a and 65b. Here, the gear 61 is meshed with a rack 16 provided on the tracks 10a and 10b, and is driven by a motor 60 connected to the gear.

Further, the ball plunger 65b shown in FIG. 3B is configured such that the interval with the ball plunger 65a can be changed by the interval adjusting screw 66, and when removing the circumferential scanning mechanism from the tracks 10a and 10b, The interval adjustment screw 66 may be rotated to increase the interval between the ball plungers 65a and 65b.

  The scanning of the probe 70 in the direction of the pipe axis is realized by a ball screw 67 attached to the support 58, a gear 63 attached to the rotation shaft of the ball screw 67, and a motor 62 connected to the gear 63. The The guide rod 68 is for smoothly moving the probe holder 72 in the pipe axis direction.

FIG. 4 is a cross-sectional view taken along the line AA in FIG. Triangular grooves 11 shown on the tracks 10a and 10b are guide grooves on which the ball plungers 65a and 65b shown in FIG. 3 travel. The fixing bolts 18a1 and 19a1 for fixing the raceways 10a and 10b and the guide rings 20a and 20b to the pipe 50 are threaded, and a bolt rotation slit (not shown) is machined at the upper end thereof. On the other hand, the fixing bolt rotating hole 22 is cut with a female screw suitable for the fixing bolt, and a jig such as a flathead screwdriver is inserted into the hole 22 and rotated so that the position of the fixing bolt can be adjusted. ing.

  FIG. 5 shows a specific embodiment of a mechanism in which two upper and lower semicircular tracks 10a and 10b and guide rings 20a and 20b are integrally connected in an annular shape. Convex alloy members 12 are fixed to the ends of the lower semicircular track 10b and the guide ring 20b by fasteners 14. On the other hand, a cylindrical hole 13 is provided at the end of the upper semicircular track 10a and the guide ring 20a, and a rotating rod 14a1 is attached so as to penetrate the hole 13.

  An operation lever 40a1 is fixed to the end of the rotating rod 14a1 on the guide ring side, and the upper and lower tracks and the guide ring are moved by the rotation of the rotating rod 41a1 interlocked with the rotation of the operating lever 40a1. Connected. FIG. 6 shows the relationship between the metal alloy tool 12 and the rotating rod 41a1 described here.

6, (a-1), (a-2), (a-3) are the states before the upper and lower semicircular tracks and the guide ring are connected, (b-1), (b-2) , (B-3) shows the state after connection. (A-1) and (b-1) are side views, (a-2) and (b-2) are front views,
(A-3) and (b-3) are plan views. The metal alloy tool 41 is a side view (a-1),
As shown in (b-1), the upper right half is cut off, and the part of the rotating rod 41 that can be confirmed in the plan views of (a-3) and (b-3) is mechanically removed. Considered not to interfere. With such a structure, the semicircular vertical track and the guide ring can be firmly connected by simply rotating the operation lever 40.

  FIG. 7 illustrates that the pipe ultrasonic flaw detector according to the present application can be easily adjusted to install the trajectory parallel to the weld line center 53, as compared with a conventional apparatus using a single trajectory. is there. FIG. 7A is a diagram for explaining the relationship between the diameter D of the pipe, the diameter d of the fixing bolt 19, the gap δ between the fixing bolt tip and the pipe surface, and the maximum inclination angle θ of the track in the conventional technique. FIG. 7B shows the diameter D of the pipe, the diameter d of the fixing bolt 19 (corresponding to the fixing bolt 19a1), the distance W between the center of the track and the center of the guide ring, and the tip of the fixing bolt in the embodiment of the present application. It is a figure explaining the relationship between each condition of gap (delta) with the piping surface, and the maximum inclination angle (theta) of a track | orbit. 1 to 4 show an example in which the fixing bolts to the raceway and the guide ring pipe are arranged at intervals of 120 degrees in the circumferential direction, but here, in order to make the explanation easy to understand, 90 bolts in the circumferential direction are used. An example of arrangement at intervals of degrees will be described.

  In FIG. 7A, a part of the fixing bolt 19 is in contact with the pipe 50 at the position A of the right end portion of the upper fixing bolt 19 and the position E of the left end portion of the lower fixing bolt 19. F is the position where the perpendicular from A intersects the bottom surface of the pipe 50, C is the position where the line connecting the position A and the right side surface of the lower fixing bolt 19 intersects the bottom surface of the pipe 50, and the right end position of the lower fixing bolt Is E, and the inclination of the trajectory with respect to the vertical direction is θ. When the track is installed in the pipe 50, ideally, it is ideal to set the inclination θ of the track to zero, but in practice it is impossible to make it zero. The distance Δ between B and C is adjusted to be about 1 mm or less. Under the above conditions, equations (1) and (2) are derived from the geometric relationship.

D × tanθ = Δ (1)
{(D + δ) −tan θ × d} × cos θ = D (2)
Here, for example, when D = 300 mm, d = 8 mm, and Δ = 1 mm, θ = 0.19 ° is calculated from Equation (1). Further, in order to set the inclination θ of the track to 0.19 ° or less, the gap δ between the tip of the fixing bolt 19 and the surface of the pipe 50 needs to be about 28 μm or less, and generation of a minute gap is not allowed. In other words, it can be imagined that it is very difficult to adjust the track parallel to the center of the weld line in the prior art.

  On the other hand, according to the pipe ultrasonic flaw detector according to the embodiment of the present invention, the geometrical conditions shown in FIG. 7B are satisfied, so that the expression (3) is derived as a conditional expression corresponding to the expression (2). It is burned.

{(D + δ) −tan θ × (W + 2 × d)} × cos θ = D (3)
As an example, in Formula (3), when W = 70 mm, the gap δ between the tip of the fixing bolt 19 and the surface of the pipe 50 is set to reduce the distance Δ between BCs to about 1 mm or less. This means that the parallelism between the center of the track and the weld line center can be easily adjusted without strictly managing the gap δ between the tip of the fixing bolt 19 and the surface of the pipe 50. ing. Further, if the relational expression of the expression (3) is used, if a gap δ between the fixing bolt and the pipe surface is given, the center of the fixing bolt 19 of the tracks 10a and 10b for making the distance Δ be about 1 mm or less. The distance W between the centers of the fixing bolts 18 of the guide rings 20a and 20b can be determined.

FIG. 8 shows another embodiment of the pipe ultrasonic flaw detector according to the present invention. In this embodiment, a roller 80 is attached to the support 58 in the embodiment shown in FIG. 1 so as to rotate in contact with the outer peripheral surface of the guide ring 20a. Other configurations are as described above. With this configuration, when the scanning mechanism moves in the circumferential direction and the support 58 moves to the lowermost part of the pipe 50, the probe 70, the probe holder 72, and the probe are moved in the pipe axial direction. Rotation moment due to the weight of the ball screw 67 and the guide rod 68 for scanning is generated and the contact surface pressure between the probe 70 and the pipe 50 tends to decrease or disappear. The guide ring 20b can be brought into strong contact with the outer peripheral surface of the guide ring 20b to support the rotation caused by the aforementioned rotational moment and receive the reaction force.

  Therefore, the probe 70 does not move in a direction away from the pipe. In addition, there is no force to shift the track and guide ring in the pipe axis direction, so there is no need to increase the tightening force of the fixing bolt that fixes the track and guide ring to the pipe, reducing the weight of the track and guide ring. be able to.

  According to each embodiment of the present invention, since both the track and the guide ring arranged at positions separated from each other in the pipe axis direction are fixed to the pipe surface with the fixing bolt, the weld line center and the track center in the conventional apparatus are Since the occurrence of the vertical or horizontal inclination of the trajectory, which has taken time to adjust the parallelism, is suppressed, it takes time to adjust the parallelism between the weld line center and the trajectory center.

  In addition, in order to set the distance between the center of the track and the guide ring in consideration of the gap between the pipe surface on both the track and the guide ring and the fixing bolt of the track and the guide ring, the parallelism with the circumferential weld line center is adjusted. The predetermined parallelism can be maintained without performing the operation.

  In addition, since the two pairs of semicircular tracks and the guide ring are mechanically connected by a plurality of lightweight connection fittings such as pipes arranged at intervals in the circumferential direction, the mass of the mechanism including the track and the guide ring And obstructions such as gamma plugs provided in the piping to be inspected can be avoided.

  Further, according to another embodiment of the present invention, the outermost periphery of the guide ring can be used as a rotational moment reaction force receiver of the probe axial scanning mechanism, so that the pipe circumferential direction of the probe scanning mechanism can be used. It is possible to simplify the suspension mechanism that corrects the positional change of the probe in the radial direction of the pipe accompanying the movement. The outer surface of the guide ring is positioned concentrically with the annular center of the track so that the probe is not pressed too strongly against the pipe when receiving the rotational moment.

  The present invention has application to a pipe ultrasonic flaw detector that inspects welds and the like of various pipes in a nuclear power plant using ultrasonic waves.

1 is an overall view of a pipe ultrasonic flaw detector according to an embodiment of the present invention. It is the figure which showed the relationship of the concentric arrangement | positioning of the track | orbit and guide ring, and piping which were seen from the right side surface of FIG. FIG. 1 is an enlarged view of the support portion of FIG. 1, (a) is a side view of the support, and (b) is a left side view of (a). It is AA arrow sectional drawing of FIG. It is a figure which shows the connection mechanism of the semicircle track | orbit and guide ring by the Example of this invention. It is a mechanism state figure in the state of connection of a connection mechanism of Drawing 5, and a connection release. It is a figure explaining the relationship between the parallelism of the center of a track | orbit and the center of a weld line in shapes, such as a track | orbit, by a prior art and the Example of this invention, (a) A figure shows the case of a prior art example, (b) FIG. These are figures which show the case of the Example of this invention. It is a general view of a pipe ultrasonic flaw detector according to another embodiment of the present invention.

Explanation of symbols

10a, 10b ... raceway, 12 ... ingot alloy tool, 16 ... rack, 18a1, 18a2, 18a3, 19a1, 19a2, 19a3 ... fixing bolt, 20a, 20b ... guide ring, 22 ... hole, 30a1, 30a2, 30a3, 30a4, 30b1 , 30b2, 30b3, 30b4 ... pipe, 40a1, 40a2 ... rotating rod operation lever, 41a1, 41a2 ... rotating rod, 50 ... piping, 52 ... welding wire, 58 ... support, 60, 62 ... motor, 65a, 65b ... ball Plunger, 66 ... spacing adjustment screw, 67 ... ball screw, 68 ... guide rod, 70 ... probe, 72 ... probe holder, 80 ... roller.

Claims (4)

An annular orbit surrounding the object,
A fixing means mounted on the track and installing the track on the object to be inspected;
A circumferential scanning mechanism that moves along the trajectory;
An axial scanning mechanism that moves the probe holder from the circumferential scanning mechanism in a scanning direction perpendicular to the trajectory and along the inspection object;
In an ultrasonic flaw detector provided with a probe equipped in the probe holder,
An annular guide ring that is disposed so as to surround the object to be inspected at positions separated in the scanning direction and is integrally attached to the track;
Other fixing means mounted on the guide ring and installing the guide ring on the object to be inspected;
Ultrasonic flaw detector equipped with.   2. The track and the guide ring according to claim 1, wherein the track and the guide ring are concentrically arranged, and the track and the guide ring are connected and integrated by a plurality of connecting members arranged at intervals along the annular direction. Ultrasonic flaw detector.   3. The track and the guide ring according to claim 1 or 2, wherein each of the track and the guide ring is divided into at least two parts in an annular direction, and a split end portion can be connected and split between the track and the split end portion of the guide ring. Ultrasonic flaw detector equipped with a connecting means. 4. The circumferential scanning mechanism according to claim 1, wherein an outermost circumferential surface of the guide ring is concentric with the track, and a guide wheel is rotated in contact with the outermost circumferential surface of the guide ring. Equipped with ultrasonic flaw detector.

Images