JP6489901B2 - Ultrasonic inspection equipment - Google Patents

Description

  The present invention relates to an ultrasonic inspection apparatus for performing a flaw detection test using ultrasonic waves mainly on equipment having a large number of tubes.

  A large number of tubes arranged in parallel at regular intervals and a tube plate perpendicular to these tubes are welded to heat exchangers and reactors in various plants. In the inspection of welding in such a heat exchanger or reactor, since the number of the above-mentioned tubes is extremely large, it is required to inspect each tube quickly and in an easy posture.

  As an inspection apparatus using ultrasonic welding for many pipes, conventionally, a probe for performing a flaw detection test using ultrasonic waves from the inside of the pipe, and a probe other than the above-mentioned pipes are inserted to fix the probe. The thing provided with the four expansion-contraction rods which have been proposed (for example, refer patent document 1). In the inspection apparatus described in Patent Document 1, when four telescopic rods are inserted into four tubes, the posture for a flaw detection test is maintained by a gripper provided at the tip of each telescopic rod. Then, the probe is inserted into a tube other than the four tubes, and an ultrasonic flaw detection test is performed from the inside of the tube.

JP-A-11-174032

  However, since the inspection apparatus described in Patent Document 1 employs an ultrasonic pulse reflection method, it requires a lot of mechanical scanning such as changing the depth of insertion into the probe tube. For this reason, in the said inspection apparatus, since time is required for a flaw detection test, it cannot test | inspect rapidly.

  In the above inspection apparatus, it is conceivable to employ a phased array method in order to omit most of the mechanical scanning. In the phased array method, electronic scanning such as linear scanning and sector scanning at various angles is possible. For this reason as well, it is necessary to stabilize the posture during the flaw detection test. On the other hand, in the said inspection apparatus, since the attitude | position for a flaw detection test is hold | maintained by the extent to which the expansion-contraction rod provided with the gripper is inserted in a pipe | tube, it cannot be said that the attitude | position is stable. Therefore, the inspection apparatus cannot adopt the phased array method, and thus has a problem that it cannot be inspected promptly.

  Then, an object of this invention is to provide the ultrasonic inspection apparatus which can test | inspect a pipe | tube rapidly.

In order to solve the above-described problem, an ultrasonic inspection apparatus according to claim 1 of the present invention is an ultrasonic inspection apparatus that sequentially performs a flaw detection test of a welded portion with ultrasonic waves on a plurality of tubes arranged in parallel. ,
A phased array probe inserted into the tube, and a jig inserted and fixed into the tube,
The jig, the outer diameter have a scaling unit to increase / smaller than the inner diameter of the tube,
The jig has a plurality of fixing legs each inserted into a pipe,
Fixing legs of the plurality book, Ru der those providing the scaling unit at different depths of the tube to be inserted respectively.
Further, in the ultrasonic inspection apparatus according to claim 2 of the present invention, the jig in the ultrasonic inspection apparatus according to claim 1 has a tightening portion for fixing the fixing leg to the pipe end.

Moreover, the ultrasonic inspection apparatus according to claim 3 of the present invention is an ultrasonic inspection apparatus that sequentially performs a flaw detection test of a welded portion by ultrasonic waves on a plurality of tubes arranged in parallel.
The phased array probe inserted into the tube, the wedge facing the inner surface of the tube into which the phased array probe is inserted, and the distance between the inner surface of the tube into which the phased array probe is inserted and the wedge A medium supply hole for supplying a contact medium filled by capillary action, and a jig that is inserted into and fixed to the pipe,
The jig has an expansion / contraction portion that makes the outer diameter larger / smaller than the inner diameter of the tube .

In addition, an ultrasonic inspection apparatus according to claim 4 of the present invention is an ultrasonic inspection apparatus that sequentially performs a flaw detection test of a welded portion by ultrasonic waves on a plurality of tubes arranged in parallel.
A phased array probe inserted into the tube, a jig inserted and fixed in a tube different from the tube into which the phased array probe is inserted, and the phased array probe A driving machine that rotates around the central axis of the pipe into which the child is inserted,
The jig has an expansion / contraction portion that makes the outer diameter larger / smaller than the inner diameter of the tube .
According to a fifth aspect of the present invention, in the ultrasonic inspection apparatus according to the fourth aspect, the jig in the ultrasonic inspection apparatus according to the fourth aspect is fixed by being inserted into a tube adjacent to the tube into which the phased array probe is inserted. It is what is done.

  According to the ultrasonic inspection apparatus, the phased array method can be adopted, and the adjustment and positioning of the depth to be inserted into the tube are facilitated, so that the inspection can be performed quickly.

1 is a longitudinal perspective view showing an ultrasonic inspection apparatus, a tube and a tube plate according to an embodiment of the present invention. It is a side view of the same ultrasonic inspection apparatus. It is a front view of the same ultrasonic inspection apparatus. It is sectional drawing which shows the state by which the same ultrasonic inspection apparatus was inserted in the pipe | tube. It is sectional drawing which shows the state by which the same ultrasonic inspection apparatus was positioned by the pipe | tube. It is sectional drawing which shows the state by which the same ultrasonic inspection apparatus was fixed to the pipe | tube reliably.

Hereinafter, an ultrasonic inspection apparatus according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, this ultrasonic inspection apparatus is provided for a facility in which a large number of tubes 90 arranged in parallel (parallel) at regular intervals and a tube plate 91 perpendicular to these tubes 90 are welded. This is an inspection device for performing a phased array flaw detection test using ultrasonic waves on a welded portion (hereinafter referred to as a welded portion 92) sequentially (in succession) from the inside of the tube 90. For this reason, the ultrasonic inspection apparatus 1 includes a device main body 2 that is inserted into a tube 90 to be subjected to a flaw detection test and performs a flaw detection test using ultrasonic waves, and a leg shape treatment that maintains the posture of the flaw detection test by the device main body 2. A tool (which is an example of a jig) 3 and an accessory box 4 containing a device necessary for a flaw detection test by the apparatus main body 2 are provided.

[Device body 2]
As shown in FIGS. 1 and 2, the apparatus main body 2 includes a body portion 10 that is inserted into the tube 90, a head portion 21 that is not inserted into the tube 90, and the leg-shaped jig 3 attached to the head portion 21. And a fixing tool 23 for fixing the accessory box 4 to the head 21. The trunk portion 10 has a brush 11 that can brush the inner surface of the tube 90 and a central axis that keeps the central axes of the tube 90 and the trunk portion 10 in order from the front side inserted into the tube 90. It has a holding part 12 and a flaw detection part 13 for performing a flaw detection test of the phased array method.

  The configuration of the body portion 10 will be described in detail with reference to FIG. The brush 11 has an outer diameter slightly larger than an inner diameter of the tube 90, and a hair tip is directed radially from the central axis of the body portion 10. The central axis holding part 12 is composed of a pipe in which a ball plunger is embedded in order to keep the central axes of the pipe 90 and the body part 10 coincident with each other. The flaw detection unit 13 includes a phased array probe 14, a wedge 15 that can face the inner surface of the tube 90, and a medium supply hole 16 that can supply a contact medium necessary for a flaw detection test using ultrasonic waves from the periphery of the wedge 15. It comprises. In addition, the flaw detection unit 13 is sized so that the distance between the inner surface of the tube 90 and the wedge 15 is several μm to several hundred μm, so that the contact medium supplied from the medium supply hole 16 is converted into a capillary phenomenon. Thus, the above interval can be satisfied. Further, the flaw detection unit 13 is configured to be able to perform a flaw detection test on the entire circumference of the tube 90 by being rotatable around the central axis of the tube 90 to be inserted.

  The head 21 incorporates a motor (which is an example of a driving machine) that rotates the flaw detection unit 13 around the central axis of the tube 90. In order to keep the distance between the end of the tube 90 on the head 21 side (hereinafter simply referred to as the tube end) and the phased array probe 14 even when the flaw detection unit 13 rotates, the flange 22 The contact surface with the tube end is smoothed. In order to supply the contact medium from the medium supply hole 16, a medium supply path is formed in the flaw detection unit 13 and the head portion 21, and a medium tube 29 for guiding the contact medium from the outside to the medium supply path is provided. Connected to the head 21.

[Leg shape jig 3]
As shown in FIGS. 1 and 3, the leg-shaped jig 3 is composed of two fixing legs 31 and 32 (which may be plural). These two fixing legs are respectively inserted into two pipes 90 adjacent to the pipe 90 into which the apparatus main body 2 is inserted, and then fixed to these pipes 90. For this reason, the fixing legs 31 and 32 and the central axis of the apparatus main body 2 are parallel to each other. The two fixing legs 31 and 32 include a first fixing leg 31 and a second fixing leg 32.

  As shown in FIG. 3, the first fixing leg 31 is provided on a leg 33 inserted into the tube 90 and one end of the leg 33 (the front side inserted into the tube 90). An expansion / contraction part 34 (an example of the expansion / contraction part) that expands / contracts by air supplied / discharged from the part 33, and a clamp that is provided at the other end of the leg part 33 and fixes the leg part 33 to the pipe end Part 35. The leg portion 33 is fixed to the head portion 21 of the apparatus main body 2 by the flange 22. The expansion / contraction part 34 is made of hard rubber and has a hollow inside. When the air is not supplied, the outer diameter is smaller than the inner diameter of the tube 90. When the air is supplied, the outer diameter is small. It is configured to be larger than the inner diameter of the tube 90 (that is, to sufficiently press the inner surface of the tube 90). The tightening portion 35 includes, for example, a screw portion concentric with the central axis of the tube 90 and a plug portion screwed into the screw portion and tightened from the tube end. In order to supply / discharge air to / from the expansion / contraction part 34, an air supply path is formed in the leg part 33, and an air tube 39 that guides air from the outside to the air supply path is provided in the leg part 33. Is connected to one end side.

  Similar to the first fixing leg 31, the second fixing leg 32 has a leg portion 37, an expansion / contraction portion 34, and a tightening portion 35. However, the leg portion 37 of the second fixing leg 32 is shorter than the leg portion 33 of the first fixing leg 31, and the expansion / contraction part 34 and the tightening part 35 of the second fixing leg 32 are the first part. It is the same as the expansion / contraction part 34 and the tightening part 35 of the fixing leg 31. In other words, the first fixing leg 31 and the second fixing leg 32 are different in depth of the expansion / contraction part 34 inserted into the tube 90, that is, fixed on the front side inserted into the tube 90. The depth is different and the other configurations are the same. In addition, since the apparatus main body 2 makes all the pipes 90 subject to the flaw detection test, the first fixing leg 31 and the second fixing leg 32 fixed by the flange 22 are adjacent to each other. It is preferable that it exists in the position inserted in.

[Attachment box 4]
The accessory box 4 is a casing that contains a battery that supplies power to the motor and an encoder that detects an angle at which the flaw detector 13 is rotated. In order to make the ultrasonic inspection apparatus 1 compact, the incidental box 4 fixed to the head 21 by the fixing tool 23 is a side part of the head 21 and air of the leg-shaped jig 3. Located on the tube 39 side.

Hereinafter, a method of using the ultrasonic inspection apparatus 1 will be described.
First, as shown in FIG. 4, the apparatus main body 2 is inserted into a tube 90 to be subjected to a flaw detection test among the numerous tubes 90, and the first fixing legs are inserted into two tubes 90 adjacent to the tube 90. 31 and the second fixing leg 32 are inserted. Then, the insertion depth is set so that the phased array probe 14 is closest to the portion to be subjected to the flaw detection test, that is, the back side of the welded portion 92 between the tube 90 and the tube plate 91 (the inner surface side of the tube 90). Adjust. When the first fixing leg 31 and the second fixing leg 32 are inserted into the pipe 90, since the outer diameter of the expansion / contraction part 34 is smaller than the inner diameter of the pipe 90, the insertion depth can be easily adjusted. .

  When this adjustment is completed, as shown in FIG. 5, the ultrasonic inspection apparatus 1 is positioned by supplying air to the expansion / contraction part 34. Once the depth adjustment is completed, it is sufficient to supply air to the expansion / contraction part 34, so that positioning is easy.

  Next, as shown in FIG. 6, in order to securely fix the ultrasonic inspection apparatus 1 to the tube 90, the first fixing leg 31 and the second fixing leg 32 are respectively connected to the tightening portions 35. To fix the end of the inserted tube 90 to the tube end. Thereby, the ultrasonic inspection apparatus 1 is fixed by the tightening portion 35 at the tube end and the two expansion / contraction portions 34 having different insertion depths.

  Thereafter, a flaw detection test is performed on the entire circumference of the tube 90 by rotating the flaw detection portion 13 with a motor. Here, the apparatus main body 2 receives vibration from the motor, but since the ultrasonic inspection apparatus 1 is securely fixed to the tube 90, the posture during the flaw detection test is stabilized, and the phased array method is used. There is no problem even if it is adopted.

  As described above, according to the ultrasonic inspection apparatus 1, the adjustment and positioning of the depth to be inserted into the tube 90 are facilitated, so that the inspection can be quickly performed. Further, since the posture when performing the flaw detection test by the ultrasonic inspection apparatus 1 is stable, the phased array method can be adopted even if a motor is used, and as a result, the inspection can be performed promptly.

  In the above embodiment, the first fixing leg 31 and the second fixing leg 32 are described as being in positions where they are inserted into adjacent pipes 90. However, they are inserted into pipes 90 that are not adjacent to each other. May be in position. In this case, the posture when performing the flaw detection test by the ultrasonic inspection apparatus 1 becomes more stable.

In the above-described embodiment, the leg-shaped jig 3 is described as including two fixing legs 31 and 32. However, the number of the leg-shaped jig 3 is not limited to two, and one or three or more may be used. Good.
Furthermore, although the apparatus main body 2 and the leg-shaped jig 3 have been described as separate objects in the above embodiment, the apparatus main body 2 and the leg-shaped jig 3 may be integrated. In this case, the body portion 10 of the apparatus main body 2 also serves as the leg portions 33 and 37 of the leg-shaped jig 3. The body portion 10 is provided with the expansion / contraction portion 34 and the head portion 21 is provided with the tightening portion 35. .

  In addition, although the contact medium has not been described in detail in the above embodiment, water or an aqueous glycerin solution is used. When water is used as the contact medium, the supply of the contact medium to the ultrasonic inspection apparatus 1 is facilitated, and processing after the flaw detection test is not required, so that inspection can be performed more quickly.

  Moreover, in the said embodiment, although demonstrated that the one expansion / contraction part 34 was provided in one leg part 33 and 37, two or more may be provided. Moreover, when the apparatus main body 2 and the leg-shaped jig | tool 3 are integrated, the expansion / contraction part 34 provided in this may be one, and may be two or more.

  Furthermore, in the said embodiment, although the expansion / contraction part 34 was demonstrated as an example of an expansion / contraction part, what is necessary is just to make an outer diameter larger / smaller than the internal diameter of the said pipe | tube. Examples of the expansion / contraction part include one that opens and closes a mechanical clamp or the like.

  In addition, in the above-described embodiment, the central shaft holding portion 12 is described as a pipe embedded with a ball plunger. However, the resin plate is restrained by a spring drive or the like. Any mechanism can be used. Further, the brush 11 may have a function of holding the central axis.

DESCRIPTION OF SYMBOLS 1 Ultrasonic inspection apparatus 2 Apparatus main body 3 Leg jig | tool 4 Attached box 10 Body part 11 Brush 12 Center axis holding part 13 Flaw detection part 14 Phased array probe 15 Wedge 16 Medium supply hole 21 Head part 22 Flange 23 Fixing tool 29 Tube for medium 31 First fixing leg 32 Second fixing leg 33 Leg (first fixing leg)
34 Expansion / contraction part 35 Fastening part 37 Leg part (second fixing leg)
39 Air tube

Claims (5)

An ultrasonic inspection apparatus that sequentially performs a flaw detection test of a welded portion by ultrasonic waves on a plurality of tubes arranged in parallel,
A phased array probe inserted into the tube, and a jig inserted and fixed into the tube,
The jig, the outer diameter have a scaling unit to increase / smaller than the inner diameter of the tube,
The jig has a plurality of fixing legs each inserted into a pipe,
The plurality of fixing legs of ultrasonic inspection device according to claim der Rukoto those providing the scaling unit at different depths of the tube to be inserted respectively. The ultrasonic inspection apparatus according to claim 1 , wherein the jig has a tightening portion for fixing the fixing leg to the pipe end. An ultrasonic inspection apparatus that sequentially performs a flaw detection test of a welded portion by ultrasonic waves on a plurality of tubes arranged in parallel,
The phased array probe inserted into the tube, the wedge facing the inner surface of the tube into which the phased array probe is inserted, and the distance between the inner surface of the tube into which the phased array probe is inserted and the wedge A medium supply hole for supplying a contact medium filled by capillary action, and a jig that is inserted into and fixed to the pipe,
The ultrasonic inspection apparatus, wherein the jig includes an expansion / contraction portion that makes the outer diameter larger / smaller than the inner diameter of the tube. An ultrasonic inspection apparatus that sequentially performs a flaw detection test of a welded portion by ultrasonic waves on a plurality of tubes arranged in parallel,
A phased array probe inserted into the tube, a jig inserted and fixed in a tube different from the tube into which the phased array probe is inserted, and the phased array probe A driving machine that rotates around the central axis of the pipe into which the child is inserted ,
The ultrasonic inspection apparatus, wherein the jig includes an expansion / contraction portion that makes the outer diameter larger / smaller than the inner diameter of the tube.   The ultrasonic inspection apparatus according to claim 4, wherein the jig is inserted into and fixed to a tube adjacent to a tube into which the phased array probe is inserted.

Images