JPH09145687A - Pipe insertion ultrasonic flaw inspection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a simple apparatus for performing ultrasonic flaw detection on the inner surface of a boiler tube without cutting the boiler tube. SOLUTION: The inventive inspection apparatus comprises a guide unit 5 for feeding a coupling type guide rod 6 provided, at the forward end thereof, with an insertion unit 4 into a header 1, a unit 7 for feeding a coil spring 10 coupled with the end of guide rod 6 fed into the pipe nest 1 and provided, at the forward end thereof, with a probe head being immersed locally into water into the guide rod 6, an ultrasonic flaw detector 13 connected, respectively, with the end of an ultrasonic flaw detection cable 11 arranged in the coil spring 10 and the end of a water hose 1, and a water pump 14. Since ultrasonic flaw detection can be performed on the inner surface of a boiler tube 2 without cutting the boiler tube and without requiring a large scale machine or enormous volume of water, inspection cost can be reduced significantly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe insertion type ultrasonic flaw detection device (hereinafter referred to as a pipe insertion type UT inspection device) applied to a deterioration inspection (thinning, cracking, etc.) of a boiler pipe.

[0002]

2. Description of the Related Art An example of a conventional ultrasonic flaw detection test for detecting wall thinning or cracks of a boiler tube will be described with reference to FIG.

In an example of the conventional ultrasonic flaw detection shown in FIG. 6, first, the boiler pipes 102a and 102b of the inlet side header 101a and the outlet side header 101b are cut, and sockets 103a and 103b are attached to them. .

One ends of hoses 104a and 104b are directly connected to the sockets 103a and 103b, the other end of the hose 104a is connected to a cable winding device 105, and the other end of the hose 104b is wound into a cable via a pressure pump 106. It is connected to the device 105.

A tip end of a cable 108 having an ultrasonic flaw detector 109 connected to the end thereof is inserted into the hose 104a via a cable winding device 105. An ultrasonic probe 107 is provided at the tip of the cable 108.

When the cable 108 provided with the ultrasonic probe 107 is inserted into the hose 104a, the pressure pump 106 is driven to cause the pressure water to flow into the boiler tube 102a, and at the same time, the cable winding device 105. Is rotated to feed the cable 108 having the ultrasonic probe 107 attached at its tip into the boiler tube 102a.

When the cable 108 is inserted to the predetermined position, the cable 108 is rewound while flowing the pressure water from the opposite direction. At this time, the ultrasonic probe 107 attached to the tip of the cable 108 rotates to detect a flaw in the boiler tube.

Next, another example of the conventional ultrasonic flaw detection test will be described with reference to FIG. The above-mentioned conventional example is applied when performing a precise inspection on all boiler tubes, but another conventional example is a case where a small number of boiler tubes are simply inspected in a short time by sampling. Applied to.

In another example of the conventional ultrasonic flaw detection shown in FIG. 10, a plurality of (for example, 16) ultrasonic probes 111 provided on the probe head 110 are connected to one end of a cable 113. The pusher 114 composed of a pressure driving roller was inserted into the boiler tube 102, and the UT inspection control device 115 connected to the other end of the cable 113 was used to measure the wall thickness of the boiler tube 102 or inspect the crack.

The probe head 110 shown in FIG.
As shown in 0 (b), a stabilizer 112 and a plurality of ultrasonic probes 111 arranged at equal intervals on the outer circumference of the stabilizer 112 and oriented in the pipe radial direction of the boiler pipe 102.
The stabilizer 52 is formed by aligning the front and rear of the ultrasonic probe 111 with the center of the inside of the boiler tube 102.

[0011]

In one example of the conventional ultrasonic flaw detection test for deterioration inspection (thinning, cracking, etc.) of the boiler tube, as described above, the tube for inserting the ultrasonic probe is used. It is necessary to disconnect the
It was expensive. In addition, it requires a large-scale device such as a pressure pump for injecting pressure water and a cable winder,
It required a large number of workers.

In another example of the conventional ultrasonic flaw detection, as described above, the insertion of the ultrasonic probe into the boiler tube depends on the frictional force of the pusher composed of the pressure driving roller. If there is a small bend in the pipe, the frictional resistance of the stabilizer and the cable inside the pipe increases, buckling of the cable occurs, and it is impossible to insert it after that, making inspection impossible.

Therefore, the other conventional example is applied only to the inspection of the straight portion of the boiler tube, and FIG.
In the economizer shown in (a) and the like, the deterioration of the central part is estimated by analogy with the inspection data of the upper and lower stages, and the inspection result was poor in reliability.

In order to solve the above problems, the present invention can insert the ultrasonic probe into the boiler tube without cutting the boiler tube, does not require large equipment, and can be operated easily.
The purpose of the present invention is to provide an inspection device that can perform measurement and can significantly reduce costs.

Further, an inspection device which realizes a simple mechanism capable of greatly improving the performance of inserting a probe head and a cable into the boiler tube and can perform a highly reliable deterioration diagnosis of the boiler tube by expanding the inspection range. Is to provide.

[0016]

[Means for Solving the Problems]

(1) An in-pipe insertion type UT inspection device according to a first aspect of the present invention is an insertion device inserted into a boiler pipe header through its inspection hole, and the insertion device disposed outside the header. , A guide device for feeding a hollow guide rod provided at the tip into the pipe head, a probe head for local water immersion inserted in the guide rod at the tip and provided with an ultrasonic flaw detection cable (hereinafter referred to as UT cable) ) And a coil hose provided with a water hose, the end of the guide rod is coupled, and the coil spring is fed into the guide rod to feed the local water immersion probe head to a predetermined position of the boiler pipe, and the UT. An ultrasonic flaw detector connected to the end of the cable and a water pump connected to the end of the water hose are featured.

In the above, when ultrasonic flaw detection of the boiler tube is performed, the guide device sends the guide rod into the tube guide,
The insertion device provided at the tip of the guide rod is made to reach a predetermined position within the tube header, and the insertion device is positioned at that position.

Next, the feeding device is provided with a local water immersion probe head at the tip thereof, and a coil spring having a UT cable and a water hose disposed therein is fed into the guide rod to guide the local water immersion probe head. It passes through the rod and the insertion device and reaches a predetermined position in the boiler tube.

When the local water immersion probe head reaches a predetermined position, the local water immersion probe head is supplied with water from a water pump via a water hose, receives an ultrasonic signal from an ultrasonic flaw detection device, and performs ultrasonic flaw detection. I do.

As described above, since the local water immersion probe head passes through the guide rod and the insertion device provided in the pipe header to reach a predetermined position in the boiler pipe, ultrasonic probe is used. No need to cut the boiler tube.

(2) The invention according to claim 2 is the UT inspection device according to the invention (1), wherein the insertion device is provided at the centering mechanism provided at the front end and at the rear end. And a guide support mechanism, and an insertion head provided between the centering mechanism and the guide support mechanism.

In the above description, since the centering mechanism and the guide support mechanism expand after the insertion device reaches a predetermined position in the tube shifter by the guide device, the insertion device is surely piped in the centered state. It is fixed on the inner surface of the stack.

(3) The invention according to claim 3 is the UT inspection device according to the invention (2), wherein the insertion head is made of polytetrafluoroethylene (hereinafter referred to as PTFE).
The attachment is provided with a tube, an air cylinder for swinging the attachment, an air cylinder for pressing against the nozzle hole portion, and a surveillance camera.

In the above, after the insertion device is fixed in the header, the attachment of the insertion head of the insertion device has a nozzle head hole for the header which communicates with the boiler pipe by the swinging air cylinder and the pressing air cylinder. Fixed to the section.

Therefore, the probe head for local water immersion at the tip of the coil spring inserted into the guide rod can easily reach a predetermined position in the boiler pipe by passing through the PTFE tube and the attachment. Since the work can be performed while being monitored by the surveillance camera, it is possible to perform the appropriate work.

(4) The invention according to claim 4 is the feed mechanism in which the guide device in the pipe inserting UT inspection device according to the invention (1) moves the coupling type guide rod back and forth with a rubber roller interposed therebetween. And a rotation mechanism for rotating the guide rod.

In the above description, since the guide rod is sandwiched by the rubber roller of the feeding mechanism and fed into the tube header, the insertion device provided at the tip of the guide rod can be reliably fed to a predetermined position in the tube header. Moreover, since the guide roller can be rotated by the rotating mechanism, the guide roller of the insertion device can be positioned in a predetermined direction of the inner circumferential direction.

(5) According to a fifth aspect of the present invention, in the in-pipe insertion type UT inspection device according to the first aspect of the present invention, the feeding device includes a guide roller for feeding the coil spring into the guide rod, and a guide roller. It is characterized by including a rotary inlet guide for connecting the rods and a feed amount detection mechanism for detecting the feed amount of the coil spring.

In the above, since the end of the guide rod fed into the header by the guiding device is connected to the feeding device by the rotary inlet guide, the connection can be performed accurately.

Further, since the coil spring having the probe head for local water immersion provided at the tip thereof is fed into the guide rod by the guide roller, reliable feeding is possible, and this feeding is performed by the feeding amount detecting mechanism while detecting the feeding amount. As a result, it is possible to correctly feed the probe head for local water immersion to a predetermined position of the boiler tube.

(6) The invention according to claim 6 is the UT inspection device according to the invention (1), wherein the probe head for local water immersion has a stabilizer for alignment and a rubber circle for sealing. It is characterized by having a board.

In the above, since the local water immersion probe head sent to a predetermined position in the boiler tube is aligned by the stabilizer, the distance between the ultrasonic probe and the inner surface of the boiler tube becomes a predetermined length. Therefore, ultrasonic flaw detection with high accuracy is possible.

Further, the portion of the inner surface of the boiler tube where ultrasonic flaw detection is performed is sealed by the rubber disc for sealing, and water is supplied only to this portion, so that economical water can be used.

(7) In the invention described in claim 7, an ultrasonic flaw detection inspection control device (hereinafter referred to as a UT inspection control device) is provided at the other end.
Is connected to the cable, the probe head is provided with an ultrasonic probe connected to one end of the cable, and the drive roller and the pressure roller are provided to push the probe head from one end of the boiler tube In the formed pipe insertion type UT inspection device, a disc-shaped pressure feed float provided on the probe head, an abacus ball-shaped cable float provided on the cable in a bead shape, and between the pusher and one end of the boiler pipe. The compressed air introduction pipe is connected to the side and the rear part is provided with a seal pipe with an inner diameter of the clearance fit larger than the outer diameter of the cable float and longer than the mounting pitch of the cable float, and a pump through which the cable passes. It is characterized by having.

In the above, when inspecting the boiler tube, first, the probe head to which the cable is connected is sent to a predetermined position in the boiler tube, the inside of the boiler tube is filled with water, and the ultrasonic probe is pulled back while pulling the cable back. The probe head is fed to a predetermined position in the boiler tube by supplying compressed air from the compressed air introducing tube of the pressure feeder and driving the drive roller of the pusher.

When compressed air is fed from the compressed air introducing pipe, a large pulling thrust is generated in the disc-shaped pressure feeding float provided in the probe head due to the pressure, and therefore even in the bend portion of the boiler pipe having a small bend. , The cable is inserted into the boiler pipe without buckling.

At the time of supplying the compressed air, the pusher is also driven, and the pressure roller and the drive roller sandwich the cable with the abacus ball-shaped cable float attached to feed it, so that the cable is fed while being braked. And is inserted at a constant speed.

When the cable passes through the seal tube of the pneumatic pump, an abacus ball-shaped cable float having an outer diameter matched with the inner diameter of the seal tube by a slight clearance fit is 1
Since at least one piece is always contained in the seal pipe, it is possible to prevent the backflow of compressed air and efficiently flow compressed air. Further, since the cable float makes point contact with the boiler pipe in the bent portion with a bend, the frictional resistance is significantly reduced, and good insertion performance can be obtained.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION A pipe insertion type UT inspection apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. The UT inspection device according to the present embodiment is applied when performing a precise inspection on all boiler tubes.

The UT according to the present embodiment shown in FIGS.
The inspection device is disposed outside the header 1 and the insertion device 4 inserted into the header 1 of the boiler tube 2 through the inspection hole 3, the guide rod 6 to which the insertion device 4 is connected at its tip. A coil spring in which a guide device 5 for feeding the tip end of the guide rod 6 into the header 1 and a rotary inlet guide 8 to which the rear end of the guide rod 6 is connected are provided and a local water immersion probe head 29 is attached to the tip. A feeding device 7 for feeding 10 into the guide rod 6, an ultrasonic flaw detector 13 and a water pump 14 respectively connected to the ends of the UT cable 11 and the water hose 12 arranged in the coil spring 10, and the guide. It comprises a support frame 9 on which the device 5 and the feeding device 7 are mounted.

In the above, when performing ultrasonic flaw detection on the boiler tube 2, first, the guide device 5 feeds the guide rod 6 into the header 1 so that the insertion device 4 provided at the tip of the guide rod 6 can be installed. It is fed to a predetermined position in the shift 1 and positioned.

Next, the probe head 2 for local water immersion is attached to the tip.
The coil spring 10 in which the UT cable 11 and the water hose 12 are provided inside is fed into the guide rod 6 by the feeding device 7, and the local water immersion probe head 29 passes through the insertion device 4. The boiler tube 2 is inserted to a predetermined position.

When the local water immersion probe head 29 reaches a predetermined position in the boiler pipe 2, the head 29 is supplied with water by the water pump 14 via the water hose 12, and an ultrasonic signal is transmitted from the ultrasonic flaw detector 13 to the head 29. Receive and perform ultrasonic flaw detection.

As shown in FIG. 2, the guiding device 5 is provided with a feeding mechanism 15 having a rubber roller 16 and a rotating mechanism 19, and when the guiding rod 6 is fed into the header 1 from the inspection hole 3, the guiding rod 6 is provided. The guide rod 6 and the insertion device 4 connected to the tip of the guide rod 6 are fed to a predetermined position in the header 1 by a rubber roller 16 provided in the feed mechanism 15 of the guide device 5 while sequentially adding short rods to the rear end. The rotation mechanism 19 rotates the guide rod 6 in the inner peripheral direction of the header 1 to position the insertion device 4 in a predetermined direction.

As shown in FIG. 3A, the insertion device 4 is provided with a guide support mechanism 17, a tip centering mechanism 18 and an insertion head 20, and as described above, the insertion device 4 in the header 1. After the positioning is completed, the guide support mechanism 17 and the tip centering mechanism 18 are expanded until they come into contact with the inner surface of the header 1, and the insertion device 4 itself is centered and fixed.

Insertion head 2 provided in the insertion device 4
0, an attachment 21 to which a PTFE tube 22 is connected as shown in FIG. 4, air cylinders 23 and 24,
A small camera 25 and a lighting device 26 are provided, and the attachment 21 is swung by an air cylinder 23, and is pressed into a nozzle hole by an air cylinder 24.

The operation of the attachment 21 is specifically carried out as shown in FIG. That is, the insertion head 20
When the air cylinder 23 provided on the slide base 32 is operated, the slide block 33 moves forward, and the attachment 21 together with the air cylinder 24 swings downward by 90 ° via the link 34 connected to the slide block 33. I do. Next, when the air cylinder 24 is operated, the attachment 21 descends and is pressed against the nozzle hole on the inner surface of the pipe header 1.

A small camera 25 provided on the rear part of the insertion head 20 and illumination tools 26 provided on both sides of the small camera 25 monitor the situation such as positioning in the nozzle hole, swinging of the attachment 21 and pressing, etc. from the outside. It is provided so that it can be.

Inside the PTFE tube 22 which is connected to and fixed to the attachment 21, a coil spring 10 having a local water immersion probe head 29 attached to the tip thereof is inserted, which is a rotary inlet guide 8 and It is sent by the feeding device 7 via the guide rod 6, and is inserted into the boiler pipe 2 by this device 7.
Can be pulled back.

As shown in FIG. 2, the feeding device 7 is provided with a rubber roller 27 for feeding the coil spring 10 and a feed amount detecting mechanism 28.
The feed amount is counted by the feed amount detection mechanism 28.

The local water immersion probe head 29 attached to the tip of the coil spring 10 is provided with rubber seal plates 29a and 29b, an ultrasonic probe 30 and a stabilizer 31, as shown in FIG. 3 (b). After being fed to a predetermined position by the feeding device 7, water is fed by the water pump 14 provided outside through the water hose 12 in the coil spring 10.

The sent water is sealed by rubber seal plates 29a and 29b provided in front of and behind the probe head 29, filled between them, and an ultrasonic probe 30 provided in the probe head 29 causes the inner surface of the boiler tube 2 to be sealed. Flaw detection of the
The data is transmitted via the UT cable 11 to the ultrasonic flaw detector 1
3 is displayed.

The local water immersion probe head 29 is used.
Can be kept at a predetermined distance from the inner surface of the boiler tube 2 by the aligning stabilizers 31 attached to the front and rear.

As described above, when the deterioration inspection of the boiler pipe is performed using the pipe insertion type UT inspection device according to the present embodiment, the local water immersion probe head is inserted into the boiler pipe through the pipe draw. Therefore, it is possible to detect flaws on the inner surface of the boiler pipe without cutting the boiler pipe.

Next, a pipe insertion type UT inspection apparatus according to another embodiment of the present invention will be described with reference to FIGS. 6 to 8. Note that, in the present embodiment, similarly to other conventional devices, a plurality of ultrasonic probes 41 are arranged on the stabilizer 42 to form the probe head 40, and one end of the probe head 40 is connected to the probe head 40. To the other end of the cable 43
The inspection control device 45 is connected to the probe head 40.
The present invention relates to a UT inspection device applied when a pusher 44 composed of a pressure roller is fed into the boiler tube 2 and inspecting only a small number of boiler tubes 2 in a short time by extracting.

The in-tube insertion type UT inspection apparatus according to the present embodiment shown in FIGS. 6 to 8 is a pumping float 47 connected to the front of the probe head 40 via a spring 46.
a, the cable 43 behind the probe head 40
, A plurality of cable floats 48 arranged behind the position of the pressure feed float 47b of the cable 43, a pressure feeder 50 provided in the front portion of the pusher 44, and An auxiliary tube 49 is provided between the pump 50 and one end of the boiler tube 2.

The pressure-feeding floats 47a and 47b are soft disc-shaped ones made of rubber or the like having an outer diameter slightly smaller than the inner diameter of the boiler tube 2 and having a thickness, and the cable float 48 is an abacus bead-shaped Teflon or the like. It is made of synthetic resin and is arranged in a beaded manner over the entire length of the cable 43.

A compressed air introducing pipe 51 is connected to a side portion of the pump 50, and the float 48 is provided at an inner rear portion thereof.
Is provided with a seal tube 52 having an inner diameter that is a slightly smaller fit with respect to the outer diameter.

The pusher 44 is provided with three drive rollers 53 for transmitting the rotation of the electric motor via gears at the lower portion thereof, and the pressure bolt 5 set on the casing body at the upper portion thereof.
4, there are provided three pressure rollers 56 connected to a bearing 55 which is vertically movable by corresponding to the drive roller 53. The pressure rollers 56 are driven by the drive roller 53 with the cable 43 interposed therebetween. Rotate. The UT inspection control device 45 incorporates a drive control unit of the pusher 44 and an ultrasonic flaw detector.

In the above, when performing ultrasonic flaw detection on the boiler tube 2, it is necessary to first send the probe head 40 into the boiler tube 2.
The procedure for feeding 0 into the boiler tube 2 will be described below.

Compressed air is fed from the compressed air introduction pipe 51 of the pressure feeder 50 in front of the pusher 44, and the pressure causes a large pulling thrust force to the disc-shaped pressure feeding floats 47a, 47b mounted in front of and behind the probe head 40. And the probe head 40 is inserted into the boiler tube 2. Therefore, the cable 43 is inserted without buckling even in a bend portion having a small bend.

The pusher 44 is provided with the pressure roller 5
6 and drive roller 53 are abacus ball-shaped cable floats 48
The cable 43 attached with is clamped and is fed. Therefore, the cable 43 is fed while being braked by the pusher 44, and is inserted at a constant speed.

When the cable 43 passes through the seal tube 52 of the pump 50, one or more abacus ball-shaped cable floats 48 having an outer diameter matched with the inner diameter of the seal tube 52 by a slight clearance fit are always provided. Since the compressed air is contained in the seal pipe 52, the reverse flow of the compressed air is blocked, and the compressed air can efficiently flow in the front boiler pipe 2.

Further, since the cable float 48 comes into point contact with the boiler tube 2 in the bent portion of the bend, the frictional resistance is greatly reduced, and good insertion performance can be obtained.

After the probe head 40 has been sent to a predetermined position in the boiler pipe 2 as described above, the air hose connected to the compressed air introduction pipe 51 is connected to the water hose to fill the boiler pipe 2 with water. While the pusher 44 is reversed and the cable 43 is pulled out to the hand, the ultrasonic probe 41 measures the wall thickness of the boiler tube 2 or inspects for cracks.

In the present embodiment, two pressure-feeding floats 47a are provided in front of and behind the probe head 40, respectively.
Although 47b is attached, if it is necessary to increase the thrust by the compressed air, the thrust can be increased by further increasing the number. Further, the pressure-feeding floats 47a and 47b can be provided only in front of or behind the probe head 40, or can also be used as a stabilizer.

[0067]

In the pipe insertion type UT inspection device of the present invention, the guide device for feeding the connection type guide rod having the insertion device at the tip into the pipe header and the end of the guide rod fed into the pipe header. A feeding device that feeds a coil spring, which is coupled and has a probe head for local water immersion at its tip, into a guide rod, and an ultrasonic flaw detector connected to the end of the UT cable and the water hose arranged in the coil spring, respectively. With a water pump, ultrasonic inspection of the inner surface of the boiler pipe is possible without cutting the boiler pipe, and without using large equipment or large amount of water, and the inspection cost can be greatly reduced. Becomes

Further, a probe head is provided with a pressure float, a cable is provided with a cable float, and a pump having a compressed air introduction tube is connected between the pusher and one end of the boiler tube to connect it to a boiler tube having a small bend. The probe head can be inserted, and the reliability of the inspection result can be greatly improved.

[Brief description of the drawings]

FIG. 1 is an overall explanatory diagram of a pipe insertion type UT inspection device according to an embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

3A and 3B are partial detailed views of FIG. 1, in which FIG. 3A is a detailed view of a portion B in FIG. 1, and FIG. 3B is a detailed view of a portion C in FIG.

FIG. 4 is a detailed view of the insertion head according to the above embodiment,
(A) is sectional drawing, (b) is the DD arrow line view of (a).

5A and 5B are operation explanatory views of the attachment of the insertion head according to the embodiment, FIG. 5A is a normal state, FIG. 5B is a swinging state, and FIG. 5C is a state of being pressed against a nozzle hole portion. It is a figure.

FIG. 6 is a pipe insertion type UT according to another embodiment of the present invention.
It is the whole explanatory view of the inspection device.

FIG. 7 is an explanatory diagram of a pressure feeder according to another embodiment.

FIG. 8 is an explanatory diagram of a pressure feeding float and a cable float according to the other embodiment.

FIG. 9 is an explanatory diagram of an example of a conventional ultrasonic flaw detection test,
(A) is a general explanatory drawing, (b) is an enlarged view of the E section of (a).

FIG. 10 is an explanatory view of another example of the conventional ultrasonic flaw detection,
(A) is a general explanatory view, (b) is an explanatory view of a probe head.

[Explanation of symbols]

 1 Pipe Alignment 2 Boiler Pipe 3 Inspection Hole 4 Inserting Device 5 Guide Device 6 Guide Rod 7 Feeding Device 8 Rotating Inlet Guide 9 Supporting Stand 10 Coil Spring 11 UT Cable 12 Water Hose 13 Ultrasonic Flaw Detector 14 Water Pump 15 Feeding Mechanism 16 Rubber roller 17 Guide support mechanism 18 Tip centering mechanism 19 Rotation mechanism 20 Insertion head 21 Attachment 22 PTFE tube 23 Swing air cylinder 24 Pushing air cylinder 25 Small camera 26 Illuminator 27 Rubber roller 28 Feed amount detection mechanism 29 Local water immersion Probe head 29a, 29b Rubber seal plate 30 Ultrasonic probe 31 Stabilizer 32 Slide base 33 Slide block 34 Link 40 Probe head 41 Ultrasonic probe 42 Stabilizer 43 Cable 44 Pusher 4 UT inspection control device 46 springs 47a, 47b pumping the float 48 cable float 49 auxiliary tube 50 pumping unit 51 the compressed air inlet pipe 52 sealed tube 53 drive roller 56 a pressure roller

Claims (7)

[Claims] 1. An insertion device to be inserted into a header of a boiler pipe through its inspection hole, and a hollow guide rod which is disposed outside the header and has the insertion device provided at its tip in the header. A guide device for feeding, a coil spring in which a probe head for local water immersion is provided at the tip and inserted in the guide rod, and a cable for ultrasonic flaw detection and a water hose are provided inside, and the end of the guide rod is connected to the guide rod. A feeding device that feeds the coil spring into the probe head for local water immersion to reach a predetermined position of the boiler tube, an ultrasonic flaw detection device to which the end of the ultrasonic flaw detection cable is connected, and the end of the water hose A pipe-insertion type ultrasonic flaw detector, which is equipped with a connected water pump. 2. The in-tube insertion type ultrasonic flaw detector according to claim 1, wherein the insertion device has a centering mechanism provided at a front end, a guide support mechanism provided at a rear end, and the same centering mechanism. And an insertion head provided between the guide support mechanism and a pipe insertion type ultrasonic flaw detector. 3. The ultrasonic inspection device for inserting a pipe in a pipe according to claim 2, wherein the insertion head has an attachment with a polytetrafluoroethylene tube, an air cylinder for swinging the attachment and a nozzle hole portion. An in-pipe insertion type ultrasonic flaw detector, comprising a pressing air cylinder and a monitoring camera. 4. The in-pipe insertion type ultrasonic flaw detector according to claim 1, wherein the guide device has a feed mechanism for moving the guide rod of the connection type back and forth with a rubber roller interposed therebetween, and a rotation mechanism for rotating the guide rod. An ultrasonic flaw detector with a tube insertion type, characterized by comprising: 5. The in-pipe insertion type ultrasonic flaw detector according to claim 1, wherein the feeding device feeds the guide roller into the guide rod with the coil spring interposed therebetween, and the rotary inlet guide that connects the guide rod. A pipe insertion type ultrasonic flaw detector, which is provided with a feed amount detection mechanism for detecting the feed amount of a coil spring. 6. The in-pipe ultrasonic flaw detector according to claim 1, wherein the local water immersion probe head includes a stabilizer for alignment and a rubber disc for sealing. Ultrasonic flaw detector for pipe insertion. 7. A cable having an ultrasonic flaw inspection control device connected to the other end, a probe head having an ultrasonic probe connected to one end of the cable, and a driving roller and a pressure roller. In a pipe insertion type ultrasonic flaw detector formed by a pusher that feeds the probe head from one end to the inside of the boiler pipe, a disc-shaped pressure feed float provided on the probe head, and an abacus provided on the cable in a beaded shape. A ball-shaped cable float, and the compressed air introduction pipe connected between the pusher and one end of the boiler pipe is connected to the side, and the cable float is attached to the rear with an inner diameter of a clearance fit larger than the outer diameter of the cable float. In-tube insertion type ultrasonic flaw detection, characterized in that a seal tube longer than the pitch is provided and a pressure feeder through which the cable passes is provided. apparatus.