JPS5826258A - Scanning machine for flaw detection - Google Patents

Abstract

PURPOSE:To perform easy and accurate flaw detection regarding bodies to be inspected which differ in thickness, internal diameter, etc., by allowing a wheel to contact and leave the circumferential surface in a flange body, and bringing a probe into elastically contact with a weld zone through a supporting part in such a way that regulation by movement is possible. CONSTITUTION:While the rolling body 25a of a clamping and running drive part D abuts on the end surface of a flange part FL, a handle 13 is rotated to move a moving block 12 away, and a driving wheel 15 is pressed against the internal circumferential surface of the flange part FL. Then, positions of slide levers 44, 41, and 46 are regulated to allow a probe PB to contact the external circumferential surface of a steel pipe SP, which is at necessary distance from the weld zone W, under an adequate pressure. In this state, when a power source is put to work, the power of a motor 17 is transmitted through gears 18, 19, and 16 to the driving wheel 15, which rolls on the internal surface of the flange body, and the probe PB also slides and moves in contact with the external circumference of the steel pipe SP. An ultrasonic wave emitted from the probe PB strikes the surface of the steel pipe SP at a large angle of incidence and is transmitted toward the weld zone W, performing flaw detection.

Description

Detailed Description of the Invention The present invention provides flaw detection of a welded part between a metal tube and a 7-lunge
It mainly relates to a scanner for performing ultrasonic flaw detection.

In the past, transmission line towers were generally manufactured using bent steel, but as transmission voltages have become higher and towers have become larger, steel pipes, which are superior in terms of strength, aesthetics, and wind resistance, are being used. Recently, there has been a trend toward using extremely large-diameter steel pipes.

By the way, 7 langes are often used to connect steel pipes in steel towers, and the 7 langes are bolted together. Conventionally, this flange is a 7 lange made by cutting a steel plate into an annular shape, as shown in Figure 5. The section FL' is externally fitted onto the end of the copper pipe Sr, and a large number of ribs RB, which are similarly cut out from a steel plate in the shape of a triangular plate, are butt-welded in such a way that the ridges thereof span the outer circumferential surface of the steel pipe SP and the back surface of the flange section. It was common to have a so-called plate with lip 7-lunge structure, but recently, as shown in FIG. A method has begun to be widely used in which the flange body FB, a so-called forged steel integral seven lange, is used and the other end of the back portion PP is butt-welded to the steel pipe SP. This means that q) high stress concentration areas are not formed;

■ The fixing bolt has a single row gauge and the load is equal.

■ Since only circumferential welding is required, the welding length is short and reliability is high, making automation of welding easy.

4. Due to the simple welded structure, quality control is easy.

This is because the latter has extremely superior features compared to the former. By the way, f''i X-ray transmission inspection and ultrasonic flaw detection are carried out to inspect the welded part between the forged steel integral 7 langes and the steel pipe SP. In particular, ultrasonic flaw detection is carried out manually by an inspection engineer. There are problems such as poor reliability, poor recordability, and poor workability, and the actual situation is that the above-mentioned feature of item 0 of this flange body FB is not fully utilized.

The present invention has been made in consideration of such actual situation, and 7
The outer diameter and wall thickness of the 7-launch part of the rung body, the inner and outer diameter of the tube part,
Wall thickness, so also the inner and outer diameter of the steel pipe, wall thickness, and 7
The purpose of this invention is to provide a new flaw detection scanner capable of performing smooth and accurate flaw detection regardless of the presence or absence of obstacles such as steps attached to the outer peripheral surface of the run 2 part and its vicinity. The invention will be described in detail based on drawings showing embodiments thereof. Fig. 2 is a partially fragmented schematic side view showing the flaw detection scanner according to the present invention (hereinafter referred to as the inventive machine) in use, and Fig. 3 is a schematic front view of the flaw detection scanner in the figure. is steel pipe, FB
H flange body is shown, and the flange body FB consists of a pipe part PP and a flange part FL integrally formed on one end of the pipe part PP, and the other end of the pipe fR<PP is butt-welded to the end of the steel pipe SP at the welding part W. has been done. Then, a probe (usually an ultrasonic angle probe) that detects flaws in the welded portion W is used, and a traveling drive unit D1 that performs a clamping function is fixed by using the inner circumferential surface of the pHLT flange body FB. It is held in sliding contact with the outer circumferential surface of the steel pipe SP in the vicinity of the welded portion W. The operation section of the clamp/traveling drive section includes a frame 11Vc, a pair of moving blocks 12, 12, and these surface moving blocks 12.
．． 12 is provided with a handle 13 that is operated to move the seven-rung body FB in the radial direction. The frame 11Vi is formed into a rectangular shape slightly shorter than the diameter of the 7th rung part FLn by using a channel material having a rectangular cross section, and the channel material 11a on the long side is provided in the center of the frame 11Vi.

118G'llll: The gearbox llc is fixed in this state. This gearbox llc and frame 11
A pair of outer rods 11b and 11b are attached to both channel members 11b and 11b on the short side, with both ends thereof being pivotally supported.
d and lid are arranged between the channel material 11a and the lid on the long side so as to be located in a straight line in a direction parallel to these, and the gear box LLC has both the outer rod lid,
An operating lever is pivotally supported on the same gate that is perpendicular to the lid. Outer rod 11d, lid located inside gear box llc
Bevel gears llf are placed facing each other at the terminals of
Both bevel gears llf, llf were also injured at one end of the operating lever located in the gearbox llc.
A bevel gear 11g that meshes with f is provided. Each of the screw rods 11d, 11d is provided with a moving block 12.12 in the middle thereof, and a handle 13 is provided at the other end of the operating rod.By forward and reverse rotation of the handle 13, both the outer rods 11d are moved. , lid are rotated forward and backward, and the moving blocks 12 and 12 are moved in the radial direction of the seven-rung body FB. Each moving block 12°121
1t, each of the outer rods, the lid, a nut portion screwed through the lid, and a channel material 11a of the frame 11;

The front surface and the opposing surface of the flange body 11a are provided with grooves (neither of which are shown) that come into sliding contact with each other, so that they can be moved in the radial direction of the flange body FB.

In addition, both channel materials 11a, lla are provided on the 7-rung body FB side surface near both ends of the long side channel materials 11a, lla.
A block 25゜25 is attached in a state where it is left in the dark, and the spherical rolling elements 25a, 25a move a part of this block 25, 25VCe'' into a 7-rung body FB.
It is embedded so as to protrude to the side and to be rotatable, so that the rolling elements 25a, 25a are in rolling contact with the end face of the seventh rung portion FL.

The drive section of the clamp/traveling drive section includes drive wheels 15.15, which move integrally with the moving block 12.12.
・, motor 17, 17. ...etc.

A pair of support shafts 14 are provided on the side of the Gilange body F B of each moving block 12.12, parallel to the axial direction of the steel pipe SP.
14. ... extends, and drive wheels 15, 15, ..., which are in rotational contact with the inner circumferential surface of the seven launch bodies FB, are connected to the respective support shafts '14, 14, ...K shafts on the tip side thereof. has been done. Each drive wheel 15, 15. On the steel pipe SP side, the axles 15a, 15a, . . .
It extends parallel to the axis of P, and a gear 16,
16. ... are installed respectively. Each gear 16, 16
．． ... are motors 17, 17. The output shaft 17a of...
The gears 18, 18. attached to the gears 17a, . ..., the respective gears 16, 16. ..., 18, 18. The motors 17, 17 . . . The rotation of ... is gear 18°1
8,...,19,19. ..., 16, 16. ...
are transmitted to the axles 15a, 15a, . . . through the drive wheels 15, 15, . ... is driven to rotate.

Motor 17, 17. ... is steel pipe 5P17) 4II11
A pair of upper and lower mounting plates 21 and 21 extending in the direction are fixed to opposite inner circumferential surfaces of the seven launch bodies FB. Mounting plate 2
1.21ij, a pair of upper and lower support plates 22 fixed to the center side end surface of the flange body FB of the movable Glock 12.12;
．． 2'2, are attached to the connecting plates 23 and 231 through the intervening L7.

Clamp and travel configured like this! In the @-# section, when the outer rods 11d and 11d are rotated forward and backward by operating the handle 13, both movement blocks 12.12 move in the radial direction of the flange FL, and the blocks '12, 12
Kakeru W no wheel 15, 15. ... and motors 17, 17 . ... Approaching the inner peripheral surface of the flange part FL,
*Separate. As a result, the drive wheels 15, 15, . It is designed so that it can be removed from the 7-lunch body FB.

And drive wheels 15, 15. The motors 17, 17.... are pressed against the inner peripheral surface of the flange body FB. ...
When rotationally driven, the driving wheels 15, 15 . ... moves in rotation on the inner circumferential surface of the flange body FB.

The axle 15a of one drive wheel 15 is provided with a local rotation wJ amount detector 24, which is constituted by a potentiometer or the like, and is connected to the axle 15a. Body FB) The distance traveled by rotation on the inner circumferential surface is detected.

A support block 39 for inserting and holding slide FIFs 41, 41 of the support portion S1, which will be described later, is provided at a position near the tip of the No. 7 frame 11 on the nozzle 13 side.

Support parts S include support parts St and Ss that move and adjust the probe PB in the radial direction of the steel pipe SPσ, support parts S2 that move and adjust the probe FB in the axial direction of the steel pipe SP, and a support part S2 that moves and adjusts the probe PB in the axial direction of the steel pipe SP. It consists of a support part S4 that follows the surface of SP so as to come into sliding contact with it. The support part S1 is provided with a support table 42 at the tip of a pair of slide rods 41 and 41 which are inserted into the customer waiting Glock 39 and held in the radial direction of the seven launch body FB. A pair of support blocks 43a, 43a are separated by a required dimension in a direction parallel to the direction,
Also, a fixture 43b is arranged between both support blocks 43a, 43a, and both slide rods 41, 41 are moved relative to the support block 39.
It is designed so that it can be fixed at any position at a. Further, the motor 17,
17. . . , and other signal lines for transmitting and receiving signals to the movement amount detector 24 and the probe PB.

The support portion S is the support block 43 of the support table 42.
A pair of slide rods 44.a, 43a and fixture 43b inserted and held in a direction parallel to the axial direction of the steel pipe sp.
A support block 45 is fixed to the tip of the support block 44, and the slide rods 44 and 44 are moved back and forth from the support eagle 42 so that the probe PB slides into contact with the weld W and the surface of the steel pipe SP. The position can be adjusted and fixed at any position by operating the fixing knob 43c.

The support part 5sFi is constructed by fixing a guide block 47 to the tip of a pair of slide rods 46, 46 which are inserted and held in the radial direction (the thin tube SP) in the support block 45,
The slide rods 46 , , 46 are moved in the radial direction of the steel pipe SP with respect to the support block 45 to set the advancement adjustment range of the probe PB relative to the surface of the steel pipe SP, and can be set to any position by operating the fixed handle 45a. That's how it is. Then, a U-shaped fitting 49 as shown in FIG. The arm part is fixed in a state facing the surface side of the steel pipe 51, and the support ring 50 is rotatably supported around the pin 49a by using pins 49a to 49f at the tip of the arm part, and 1. An holder H with a probe FB fixed to this support ring 50 is pivotally supported at two locations in the diametrical direction using pins 50a, and the holder H is attached to a pin 49a.
, 50a so as to be tiltable in two mutually orthogonal directions. A coil spring 51 is fitted into the guide rod 48 between the guide block 47 and the mounting J449, and this biases the probe PB toward the surface side of the steel pipe SP. In addition, probe P
Although the case in which an ultrasonic angle probe is used has been described in B, it goes without saying that an eddy current probe or the like may also be used.

In addition, the slide rod 44 in the support part S is provided with a distance between the weld W1 and the surface of the steel pipe sp where the probe PB is to be brought into sliding contact, according to the dimensional specifications of the wall thickness of the weld W1 steel pipe sp to be inspected. If the dimensions are pre-scaled and the dimensional specifications are different or if the skip distance is to be adjusted, slide the slide rod 44 from the support block 43a according to each scale.
By adjusting the protruding length of the probe PB, the probe PB can be positioned opposite to the surface of the steel pipe SP separated from the weld W by a required distance. 60 is a step provided on the outer peripheral surface of the clamp portion PL.

In the machine of the present invention configured in this manner, the main handle 13 is initially rotated manually in the clamp/traveling drive section to connect the outer rod lid, l via the bevel gears lug, llf, llf'.
id is rotated to bring the moving block 12.12 closer to a dimension smaller than the inner diameter of the clamp body FB,
In this state, lift the whole thing with a crane or the like and attach both moving plates 12, 12 of the clamp/traveling drive part to the clamp body FB.
The rolling elements 24a and 24m of the cylinders 24 and 24, which are positioned inside the frame 11 and fixed to the frame 11, are connected to the flange portion Fl.
Rotate the handle 13 in the correct direction while hitting the end face of the
Both moving blocks 12.12 are moved apart, and each driving wheel 15, 15. ... is brought into pressure contact with the inner circumferential surface of the flange portion FL.

As a result, the clamp-cum-traveling drive section D1 and, therefore, the support section S, which is integrally fixed to the clamp-cum-travel drive section, are also integrally fixed to the clamp body FB. Next, the fixed handle 43c on the support table 42 is loosened, and the position of the slide rod 44 relative to the support table 42 is adjusted so that the steel pipe S
Adjustment is made according to the wall thickness of P, etc., and, for example, it is determined that flaw detection is first performed in 0.5 skips on the welded part W, and the fixed handle 43c is tightened to fix the slide rod 44. At this time, the scale on the slide rod 44 is used. Next, loosen the fixed handle 39a and/or h45a to adjust the position of the slide rod 41 with respect to the support block 39 and/or the position of the slide rod 46 with respect to the support block 45, so that the probe FB is moved from the welding sw to the required position. Dimensionally spaced steel pipe S
(P), and then tighten the fixed handles 39a and 45a to fix each slide rod 41 and 46. In this state, probe FB
is elastically held on the surface of the steel pipe SP by the expansion force of the coil spring 51, and even if there are irregularities on the surface of the steel pipes S and P, the support ring 50 can move around the pin 49a,
The separated holders H rotate around the bins 50a and the probes P
Hold B in proper contact with the surface of the steel pipe SP. probe FB,
(1 quantity detector 24 and motor L7, 17...
When the power switch is turned on, the motors 17, 17.
...(1) Force is gear 18.18. ..., 19, 19
．． ..., 16, 16. Drive wheels 15,1 through...
5. ..., the driving wheels 15, 15°... are caused to contact the inner peripheral surface of the flange body FB two rotations, and accordingly, the probe PB is also moved to slide into contact with the outer peripheral surface of the steel pipe SP. I'm getting beaten up. The ultrasonic waves emitted from the probe PB are incident on the surface of the steel pipe SP at a large incident angle and propagated toward the weld W side. If there is a flaw, the flaw echo reflected from the flaw is captured and sent to a distance signal corresponding to the distance traveled from the flaw detection starting position toward the station, which is output from the moving pre-detector 24 attached to the traveling drive unit. This information is also input to the main body of the flaw detection apparatus (not shown) so that the position of the flawed part in the local direction is used as a stopper.

Drive wheels 15, 15. ... has rotated along the inner peripheral surface of the flange body FB, and when the probe PB has finished rotating along the outer viewing surface of the steel pipe SP, the probe position relative to the weld WK is For example, after changing the position where flaw detection is performed with 0.75 skips (<y change the motor l 7 , 17...
is rotated in the opposite direction, and then ultrasonic angle flaw detection is performed. This is repeated several times to detect flaws in the weld W over the entire V in the local direction and thickness direction.

In the machine of the present invention, even if obstacles such as the step 60 are placed on the outer peripheral surface of the clamp part FL, flaw detection can be performed without any problem, and the movable block 12 in the clamp/traveling drive part 12 is moved in the radial direction to move toward and away from the inner circumferential direction of the clamp cup FB, so it can be applied regardless of the inner diameter of the clamp part FL, and the width dimension of the clamp part FL etc. Each support part 81 to S
It can be easily applied by adjusting the slide rods 41, 44, 46 at 4, and the range of application is extremely wide. ... is flange body FB
Since the probe moves around the center of rotation, the probe P
The flaw detection trajectory drawn by B is also accurate and there is little variation in flaw detection accuracy.

As described above, the device of the present invention has an extremely wide range of applicability to objects having various dimensions such as wall thickness and inner diameter, and the present invention is superior in that it can significantly improve flaw detection accuracy, workability, and work efficiency. It has the following effects.

[Brief explanation of drawings]

Fig. 1 is an external view of a seven-piece forged steel flange to which the machine of the present invention is applied, Fig. 2 is a partially fragmented schematic side view showing the machine of the present invention installed, and Fig. 3 is a schematic front view. , Figure 4 t/'
Figure 5 is a partial perspective view showing the support part of the i-probe, and an external view of the plate flange with a harp. D... Clamp and travel drive unit PB... Probe s,
s,,s,,s,,,s,...Support part 11...Frame 12...Movement block 13...) Endle 14...Support shaft 15...Drive wheel 16, 18 ．．
19...Gear 17...Motor 24...Circumferential movement amount detector 25...Block 25a...Rolling element 3
8... Connector 39... Support block 41, 44
．． 46...Slide rod 45...Support rod, rotor 4
7...Guide block 49...Mounting tool 50...
Supporting Ring Patent Applicant Sumitomo Kinpu Industries Co., Ltd. Agent Patent Attorney Noboru Kono Inudayu p
l Figure 4 80'$ 5 Figure

Claims (1)

[Claims] 1. A flaw detection scanner for the welded part between a tube body and a tube part of a 7-lunge body welded thereto, which is brought into contact with different positions in the circumferential direction of the inner circumferential surface of the 7-lunge body, and the 7-lunge body It has a plurality of wheels that perform a clamping function by moving toward and away from the inside of the body, at least one of which includes a traveling drive unit that is rotationally driven by a drive means, and a traveling drive unit that is attached to the traveling drive unit and that welds the probe. and a support part that can be adjusted to move the probe in the axial direction and radial direction of the tube body and/or the tube part so as to bring the probe into contact with the welded part or its vicinity. Scanning machine for flaw detection.