JPH0731162B2 - Ultrasonic flaw detector for ERW pipe - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for ultrasonically detecting a welding defect in a seam portion of an electric resistance welded pipe manufacturing line.

[Conventional technology]

In recent years, a loop car is used for the tail of the coil that is being used for pipe making, instead of the so-called coil pipe making method, in which setup is changed for each coil and plate passing is performed in order to improve the operating rate and yield of pipe making mills. Therefore, a so-called continuous pipe-making method is being adopted in which heads of different coils are sequentially welded to produce a pipe while providing a time margin.

In this case, the widths and wall thicknesses of the coils to be connected are not necessarily the same, so that the diameter and wall thickness of the electric resistance welded pipe to be manufactured also differ.

Therefore, even in ultrasonic flaw detectors for seams, which have been widely used to guarantee the quality of ERW pipes, flaw detection can be continued without any trouble by quick setup change for such different diameter pipes and thick wall pipes. It is hoped that this will be possible.

As a device for this purpose, a device as shown in FIG. 8 has been conventionally proposed.

FIG. 8 is a perspective view showing a conventional flaw detection device (Japanese Utility Model Publication No. 56-25414), 51 is a fixed frame, 52 is a flaw detection device supported by the fixed frame 51, and P is an electric resistance welded pipe. . The electric resistance welded pipe P is arranged so that the seam portion S is located above and is transferred in the arrow direction. Above the transfer area of the electric resistance welded pipe P, the flaw detection device 52 uses the fixing frame 51 and the mounting frame 53. Have been installed. On the front surface of the mounting frame 53, a plurality of guide rolls 54 are used, and an arc-shaped segment 55 having a gear 55a is supported by a motor 69 so as to be movable leftward and rightward along the guide rolls 54. . A support frame 56 is mounted on the front surface of the segment 55, and a parallel link mechanism composed of links 61, 62, 63 is supported via a rotary shaft 57 and an air cylinder 58 provided on the support frame 56.

This parallel link mechanism is constructed such that the base ends of the links 61 and 62 are rotatably connected to both ends of the link 63 via spherical bearings 61a and 62a, respectively.
Each tip has the same spherical bearing 61b.
The holding frame 65 is rotatably mounted at its mounting portion 64 (only one side is shown in the drawing).

A matching mechanism 66 and an arc frame 67 are provided between a pair of left and right holding frames 65 (only one side is shown in the drawing) rotatably supported by the parallel link mechanism. The diameter adjusting mechanism 66 is provided with a pair of copying rollers 66a, 66a which are in rolling contact with the outer surface of the electric resistance welded pipe P, are opened and closed by rotating the handle 66b according to the diameter, and whose mutual opening angles change.

Further, a probe 68 facing the seam portion S side of the electric resistance welded pipe P is movably attached to the arc frame 67 via a sliding frame 67a.

Thus, in such a conventional device, for example, an electric resistance welded pipe P
The parallel link mechanism rotates upwards and downwards about the spherical bearings 61a and 62a as the center of rotation when the parallel translation is performed in the upward and downward directions, and the holding frame 65 moves the spherical bearing 62b.
While moving in a horizontal position with the center of rotation as
The probe 68 is moved following the seam S of the electric resistance welded pipe P.

When the electric resistance welded pipe P is moved in parallel in the horizontal direction, the parallel link mechanism changes from a rectangular shape to a parallelogram shape in the horizontal plane with each spherical bearing 61a, 62a, 62b as a fulcrum.
The holding frame 65 also moves in parallel in the horizontal direction while riding on the surface of the electric resistance welded pipe P, and causes the probe 68 to follow the seam S.

When the seam S of the electric resistance welded pipe P is displaced in the circumferential direction, the motor 55 moves the segment 55 along the guide roll 54 to the left,
The probe 68 is moved rightward, and the probe 68 is moved following the seam S.

[Problems to be Solved by the Invention]

By the way, in such a conventional ultrasonic flaw detector, the probe 68 is attached to the seam S depending on the posture of the electric resistance welded pipe P.
Can be made to face each other. However, on the contrary, the slippage of each joint of the parallel link mechanism easily causes a positional deviation, and the diameter adjusting mechanism is used when changing the diameter of the electric resistance welded pipe P.
The copying roller 66a in 66 must be operated by the handle 66b, and the position of each probe 68 must be manually adjusted according to the diameter and wall thickness of the electric resistance welded pipe P. There is a problem that it takes skill to adjust the position of the probe 68 which is required to some extent in a short time, and it is difficult to perform quick setup change.

Further, since the arcuate segment 55 is used, it becomes bulky and there is a problem that the equipment cost is high.

The present invention has been made in view of such circumstances, and an object of the present invention is to detect a seam portion at the time of changeover of wall thickness and pipe diameter change, and automatically and accurately detect a probe on the seam portion. An object of the present invention is to provide an ultrasonic flaw detector for an electric resistance welded pipe, which can be moved quickly and quickly and is inexpensive.

[Means for Solving the Problems]

An ultrasonic flaw detector for an electric resistance welded pipe according to the present invention includes a sensor for detecting a positional displacement of a seam portion of an electric resistance welded pipe that is moved in the axial direction in the circumferential direction of the electric resistance welded pipe, and a probe for flaw detection of the seam portion. In an ultrasonic flaw detector for an electric resistance welded pipe, which holds a child and has means for moving the probe to a position corresponding to the seam portion detected by the sensor, the means for moving the probe is An elevating frame supported so as to be movable up and down with respect to the transfer area of the sewing pipe,
A first moving board that is movably supported in the upper and lower directions orthogonal to the moving direction of the electric resistance welded pipe, and movably supported in left and right directions that are orthogonal to the moving direction of the electric resistance welded pipe. , A second movable platen having a follower roller fixed to the lower part to follow the horizontal and vertical movements of the electric resistance welded pipe, and a third movable platen supported by the second movable platen so as to be movable in the horizontal direction. Moving board,
A fourth movable plate which is movably supported in an upper and lower direction parallel to the first movable plate with respect to the third movable plate; and a probe which is movable in a far and near direction with respect to the surface of the electric resistance welded pipe. , A holding frame which is provided at the lower portion with a copying roller that follows in the pipe circumferential direction, and is supported so as to be rotatable in the left-right direction with respect to the fourth movable plate, and the second movable plate and the third movable plate. Drive means for tilting the holding frame with respect to the position shift direction of the seam portion detected by the sensor by forcibly moving the holding frame in the left-right direction.

[Action]

According to the present invention, when the position of the seam portion in the electric resistance welded pipe changes during flaw detection, the seam sensor detects this and the driving means moves the second and third movable plates to the left and right directions in a strong manner. By moving, the third moving platen and the fourth moving platen move leftward and rightward with respect to the second moving platen which is fixed to the electric resistance welded pipe by the copying roller, so that On the other hand, the holding frame in which the copying roller is in a locked state tilts around the electric resistance welded pipe toward the displaced side of the seam portion, and causes the probe to follow the seam portion.

〔Example〕

Hereinafter, the present invention will be specifically described with reference to the drawings illustrating the embodiments. FIG. 1 is a conceptual view showing an ultrasonic flaw detector for an electric resistance welded pipe according to the present invention (hereinafter referred to as “the present invention device”) in an expanded state in the transfer direction of the electric resistance welded pipe, and FIG. 2 is a side view of the present invention device, and FIG.
The figure is also a front view, in which 1 is an ultrasonic flaw detector, 2
Indicates a fixed frame, and P indicates an electric resistance welded tube which is an object to be inspected.
The electric resistance welded pipe P is adapted to be transferred in the direction of the arrow with the seam S thereof right above, and the ultrasonic flaw detector 1 is fixed to the fixed frame 2 above the transfer region of the electric resistance welded pipe P. It is arranged so as to be able to move up and down via an elevating frame 11.

The elevating frame 11 is arranged so as to be able to ascend and descend along a guide member (not shown), and a threaded rod 4 connected to the motor 3 provided in the fixed frame 2 is threadedly penetrated into the bracket 11b.
The motor 3 can be raised and lowered by the forward and reverse rotations.

On the front side of the elevating frame 11 (the transfer direction of the electric resistance welded pipe P), four movable plates 13, 14, 15, 16 which are relatively movable in the vertical direction and / or the horizontal direction are arranged in the front side in this order. They are arranged in parallel in a sequentially stacked state.

A holding frame 20 is provided at a lower portion of the front surface of the movable platen 16 located at the forefront, and substantially at the center in the left and right directions.
It is pivotally supported using d, and the fourth moving plate 16 is supported by a spring 16e.
The holding frame 20 is restrained from freely rotating with respect to and is returned and held in the neutral position shown in FIG.

The holding frame 20 has a rectangular frame shape in the first half portion,
The second part boom portion 20a to the beam shape to Tsushide the probe B ₁ .about.B ₆ is formed.

A sensor 19 for the seam portion S is attached to the front end of the holding frame 20 by a stand 20c, and a pair of copying rollers 20e arranged in a V shape are integrally fixed to the lower center of the front and rear directions. Further, at the rear end, a support stand having a roller 29 rollingly contacting the surface of the electric resistance welded pipe P is provided at the lower end.

The seam portion sensor 19 is equipped with a camera (not shown) that captures the seam portion S of the electric resistance welded pipe P, and detects the positional deviation of the reference point from the seam portion S and corrects it by the servo motor.
A control signal is output to 14g, and the holding frame 20 is rotated in the circumferential direction along the outer circumference of the electric resistance welded pipe P so that the center of the camera faces the seam S by the cooperation of the servo motor 14g and the copying roller 20e. It is like this.

The first movable platen 13 is provided on the front surface of the elevating frame 11 with a pair of guide rails 11a, 11a composed of ball screws or the like arranged in parallel in the vertical direction at required intervals in the left and right directions, and a guide bearing 13c. , 13c are arranged so as to be movable in the upper and lower directions, and the long hole 13d of the support piece 13b provided at the upper end is provided with a lifting frame.
Hook 12 of rod in air ring 12 provided in 11
It is engaged with a.

As a result, the first movable platen 13 can be moved upward and downward relative to the elevating frame 11 by driving the air cylinder 12. The second movable platen 14 uses guide bearings 14c and 14c on a pair of guide rails 13a and 13a that form a ball screw arranged on the rear surface side of the movable platen 13 in an upward and downward direction with a required space in between and in parallel. Are arranged so as to be relatively movable in the left and right directions with respect to the first movable platen 13.

The third movable platen 15 has a pair of guide rails 14a, 14a, which form a ball screw arranged in parallel in the upper and lower sides of the movable platen 14 at a predetermined interval in a downward direction, with guide bearings 15c, 1
It is arranged so as to be relatively movable in the left and right directions with respect to the second movable platen 14 using 5c.

The fourth movable platen 16 comprises a pair of vertically oriented guide rails 15a, 15a, which are ball screws arranged on the front surface of the third movable platen 15 with left and right directions at predetermined intervals, and Dide bearings 16c, 16c.
Is arranged so as to be relatively movable upward and downward with respect to the movable platen 15.

The second movable platen 14 has a downward Y fixed to the center of its lower end.
A pair of copying rollers 14e are fixed in a V shape in a front view in a manner of straddling over the electric resistance welded pipe P via a V-shaped holder 14d, and a mounting plate 14f projecting to the rear surface side at the upper end front surface thereof. Servo motor 14g is attached to. A guide rail 14h forming a ball screw is arranged parallel to the guide rail 14a on the upper part of the second movable platen 14, and the guide rail 14h
Is connected to the servomotor 14g. Further, the guide rail 14h is screwed into a guide bearing 15d fixed to the third moving platen 15, and the second moving platen 14 and the third moving platen can be rotated by rotating the servomotor 14g forward and backward.
15 and 15 are forcibly moved relative to the left and right.

However, in this case, if the second moving platen 14 is moved to the left side in FIG.
Is fixed and is in a state of straddling the electric resistance welded pipe P and being locked to the electric resistance welded pipe P, the second movable platen 14 does not substantially move to the right.

On the other hand, the fourth moving platen 16 is connected to the third moving platen 15, and the copying roller 20e is also located at the lower end of the fourth moving platen 16. The copying roller 20e is connected to the holding frame 20. It is integral and is pivotally supported on the fourth moving platen 16 by a horizontal shaft 16d.

Therefore, when the fourth movable platen 16 moves to the left, the copying roller 20e and the holding frame 20 are moved by the copying roller 20e.
As a result of the engagement with the, a rotational movement to the left about the horizontal axis 16d occurs as a whole. In other words, the copying roller 20e and the holding frame 20 rotate counterclockwise around the axial center line of the electric resistance welded pipe P.

Further, when the copying rollers 14e, 14e are lowered by the air cylinder 12 as a whole onto the moving range of the electric resistance welded pipe P, the copying rollers 14e and 14e roll and contact the upper surface of the electric resistance welded pipe P, resulting in the movement of the electric resistance welded pipe. When the area is shifted to the left or right, the copy roller 14e,
One of 14e rolls onto the electric resistance welded pipe P, and the copying roller 14e
The second movable platen 14 is moved along the guide rail 13a of the first movable platen 13 through the second movable platen 14 via the action force for moving the second movable platen 14 toward the position shift side of the electric resistance welded pipe P. Is moved to either the left side or the right side, and both copying rollers 14e, 14e also have a function of moving to a position where they cross over the outer peripheral surface of the electric resistance welded pipe P with an equal load and automatically positioning there. ing.

Further, the driving means composed of the servo motor 14g, the guide rails 14h, and the guide bearings 15d restrains the third movable platen 15 with respect to the second movable platen 14, and thus the fourth movable platen 16, the free movement in the left and right directions. It also has a function to do.

FIG. 4 is a partially enlarged front view taken along the line IV-IV in FIG.
The figure is an enlarged front view of the holder, and Fig. 6 is its side view.
The suspension arm 21 of each probe B (B _{1 to} B ₆ ) is a holding frame 20.
A mounting frame 20d that is fixed to the boom portion 20a projecting forward in the left and right alternately at predetermined intervals in the longitudinal direction of the boom portion 20a.
Is attached to.

In FIG. 4, 23 is an upper arm and is a pair of links 23.
The upper end of the lower arm 24 is pivotally supported on the mounting frame 20d by the shaft 23b, and the lower end is pivotally connected to the upper end of the link constituting the lower arm 24 by the shaft 23c. The holders 25 of the probes B ₃ and B ₄ are rotatably supported by a horizontally oriented shaft 24e, and each has a letter shape in a front view as a whole, and is connected to the suspension arm 21 on the right side of the boom portion 20a. The holder 25 supported by the suspension arm 21 on the right side intersects with the suspension arm 21 on the left side at the lower end portion of the lower arm 24 thereof. The holders 25 supported by the suspension arms 21 are arranged so as to face the upper right side of the seam portion S of the electric resistance welded pipe P, respectively.

Reference numeral 26 denotes a fixing mechanism for allowing and restricting relative movement between the upper arm 23 and the lower arm 24.
Insert the connecting piece 26b into the air brake 26a supported by the bracket 24a provided at the upper end of the connecting piece 24, and connect the connecting piece 26b.
One end of 26b has one link 23a that constitutes the upper arm 23.
Of the air brake 26a, the brake shoe (not shown) in the air brake 26a is pneumatically pressed against the connecting piece 26b to fix the connecting piece 26b. The relative movement between the lower arms 23 and 24 is restrained, while the fixing to the connecting piece 26b is released, so that the relative movement between the upper and lower arms 23 and 24 can be allowed.

27 is a probe B (B ₁ , B ₆ ) for the seam S of the electric resistance welded pipe P
The position adjustment mechanism of the pulse motor 27a
And the upper arm parallel to the output shaft
A screw rod 27b threaded through a nut member 23d provided on the link 23a of the shaft 23 is pivotally supported, and timings are provided to pulleys provided respectively between the output shaft of the pulse motor 27a and the guide rail 27b forming the ball screw. The belt 27c is stretched and connected, and the upper arm 23 is rotated upward and downward about the upper end side shaft fulcrum by the forward and reverse driving of the pulse motor 27a, and the seam portion S of the electric resistance welded pipe P is rotated. The distance l between the probe and the surface of the electric resistance welded pipe P facing the probe B is within the range of l '.
It can be adjusted appropriately according to the diameter, wall thickness, etc.

FIG. 5 is an enlarged front view of the holder 25, and FIG. 6 is a side view of the same. The holder 25 is a hollow water chamber, in which the water supply pipe 25a and the injection nozzle 25b are connected. The probe B is disposed inside, and the electric resistance welded pipe P is provided at the bottom.
Copying rollers 25c, 25c for the surface of the are provided.

When the probe B faces the right side of the seam portion S of the electric resistance welded pipe P, for example, the probe B faces a substantial center between the copying rollers 25c, 25c and is located at a predetermined angle right above the center line thereof. It is installed in a tilted state, and the jet nozzle 25b is provided on the extension of the lower end of the jet nozzle 25b so as to project to the lower portion of the holder 25 with its center line aligned with the center line of the probe B. The lower end portion is close to the surface of the electric resistance welded pipe P and faces the surface of the electric resistance welded pipe P when the copying rollers 25c, 25c are in rolling contact with the surface of the electric resistance welded pipe P.

The copying rollers 25c, 25c are pivotally supported at the lower ends of both ends of a gate-shaped frame 25d. In the frame 25d, support pieces 25e provided on both sides of the frame 25d are pivotally supported on the side wall of the holder 25 by a shaft 25f, and are biased in the arrow direction by a spring (not shown). A locking piece 25g is pivotally supported on the front surface side of the frame 25d, and by selectively locking the locking piece 25a to locking step portions 25h and 25j formed on the front surface of the holder 25, the copying roller The 25c and 25c can be selectively positioned at the copying position shown by the solid line in FIG. 6 and the retracted position shown by the broken line.

Reference numeral 25k denotes an air brake which fixes and releases the shaft 24e which pivotally supports the holder 25 to the lower arm 24 with respect to the lower arm 24, in other words, the holder 25 with respect to the lower arm 24.
Is fixed and rotatable.

In FIG. 5, reference numeral 25l denotes an elastic seal material made of rubber or the like, which is vertically installed under the holder 25, and its lower end is located at a slight distance from the electric resistance welded pipe P during flaw detection. P
The air jet nozzle 25m for air purging the water flowing in to the opposite side through the gap between the surface of the electric discharge pipe 25 and the surface of the electric resistance welded pipe P is provided along the seam portion. The flow is prevented from flowing to the S side.

Others In FIG. 1, 29 is the supporting roller of the holding frame 20.

In such an apparatus of the present invention, the motor 3 is driven to lower the elevating frame 11 by a predetermined dimension according to the diameter of the electric resistance welded pipe P in FIG. 1, and then the air cylinder 12 is driven. Then, the first to fourth moving plates 13 to 16 and the holding frame 20 are further lowered, and the copying rollers 14e and 14e of the second moving plate 14 and the copying rollers 20e and 20e of the holding frame 20 are connected to the electric resistance welding pipe P. Show on the moving area.

Since the fourth movable platen 16 is lowered to the lower limit of the third movable platen 15 by the load and stopped, the copying rollers 20e, 20e of the holding frame 20 are the copying rollers of the second movable platen 14. Located below 14e, 14e, the air cylinder 1
When the first to fourth moving plates 13 to 16 and the holding frame 20 are lowered toward the moving area of the electric resistance welded pipe P at 2, first, the copying rollers 20e, 20e and the rear supporting roller 29 of the holding frame 20 are moved.
Rolls on the outer peripheral surface of the electric resistance welded pipe P, and then the copying rollers 14e, 14
e also rolls on the outer peripheral surface of the electric resistance welded pipe P.

At the same time, release the air brake 26a shown in FIG.
6b is released, relative movement between the upper arm 23 and the lower arm 24 is allowed, and the air brake 25k shown in FIG. 6 is released to allow the holder 25 to rotate with respect to the lower arm 24.
In this state, the copying roller 25c of the holder 25 is brought into rolling contact with the surface of the electric resistance welded pipe P. The pulse motor 27a shown in FIG. 4 is driven to rotate the upper arm 23 around its upper end portion, and the holder 25
Is moved in the circumferential direction along the surface of the electric seam P, and the probe
The holders 25 of B ₁ , B ₃ , B ₅ are on the left side of the seam S, and the holders 25 of the probes B ₂ , B ₄ , B ₆ are on the right side of the seam S, respectively. Alternately facing each other, seam part S
The distance l or l'from the position where the probe B opposes is properly set, and when the setting is completed, the air brakes 26a and 25k are operated to brake the connecting piece 26b, and the holder 25 is attached to the lower arm 24. Fix it against. Water is jetted from the jet nozzle 25b, ultrasonic waves are oscillated from one of the probes B (B ₁ , B ₃ , B ₅ ) toward one side of the seam portion S of the electric resistance welded pipe P to detect clockwise flaw detection. , And counter-clockwise ultrasonic flaw detection is started by the other probe B (B ₂ , B ₄ , B ₆ ).

<When the path line of the electric resistance welded pipe P is displaced upward or downward> During the flaw detection, the ultrasonic flaw detector 1 includes the support roller 29, the pair of copy rollers 20e and 14e, and the copy roller 2 of each holder 25.
At 5c, the full load is supported by the electric resistance welded pipe P,
Moreover, as a whole, the upward and downward movements are allowed within the range of the elongated hole 13c provided in the support piece 13b of the first moving platen 13, so that the electric resistance welded pipe P can be moved upward and downward within this range. It is possible to follow the deviation due to its own weight without any hindrance.

<When the pass line of the electric resistance welded pipe P is displaced to the left or right> When the movement range is displaced to the left or right while the seam portion S of the electric resistance welded pipe P is directed upward, the electric resistance welded pipe P straddles the electric resistance welded pipe P. The electric resistance welded pipe P is passed through the pair of copying rollers 14e and 20e which are in rolling contact with each other.
The copying rollers 14e, 20e rollingly contacting on the side of the position shift are subjected to a lateral action force larger than those of the copying rollers 14e, 20e located on the opposite side, and the second to fourth movement is performed in cooperation with the load. Boards 14, 15, 16 and holding frame 20 are the first moving board
It is moved toward the position deviation side of the electric resistance welded pipe P with respect to 13, and stopped at a position where the rolling pressures of the copying rollers 14e, 14e, 20e, 20e with respect to the electric resistance welded pipe P become equal, Therefore, each probe B can be moved in accordance with the positional deviation.

<When the seam portion of the electric resistance welded pipe P is displaced in the circumferential direction> Fig. 7 shows the probe B for the displacement of the seam portion S in the circumferential direction.
FIG. 7 is an explanatory view showing a follow-up mode of FIG. 7, in which the seam portion S of the electric resistance welded pipe P is moved from the normal position shown in FIG. 7 (a) to either the circumferential direction as shown in FIG. 7 (b) or (c). If it shifts, the seam sensor 19 detects it and outputs a control signal according to the direction and the amount of displacement to the servomotor 14g, and the third and fourth movements with respect to the second moving platen 14 are performed. The boards 15 and 16 and the holding frame 20 are forcibly moved to the left or right.

However, the copy rollers 20e, 20e of the holding frame 20 are
Since it is in a state of straddling over, it cannot move horizontally in the left and right directions. As a result, the upper part of the holding frame 20 can be moved leftward or rightward while the lower part thereof is restrained by the electric resistance welded pipe P. The holding frame 20 has an electric resistance welded pipe P centered on the horizontal axis 16d.
When it is detected that the seam sensor 19 is tilted to a position facing the seam portion S and the positional deviation is eliminated, it stops at that position. Each probe B (B ₁ ~B ₆₎ also caused to follow the seam S with the rotation of the holding frame 20, it is possible to continue the flaw as it is.

<Changeover for changing wall thickness and tube diameter> To change the tube diameter, move the probe B to the retracted position in advance, adjust the motor 3 up and down, and copy the rollers 14e, 20e.
To the surface of the next electric resistance welded pipe P and then the air brake
26a and 25k are released, and at the same time, the pulse motor 27a is driven to slide each holder 25 sideways from the seam portion S to a predetermined position to set the gap between the seam portion S and the seam portion S to an appropriate distance l, and the air brake 26a , 25k may be operated to fix the holder 25 and the upper arm 23.

〔effect〕

As described above, in the device of the present invention, the upper, lower,
For left and right movements, the first to fourth moving boards move up and down with respect to the lifting frame, and the second to fourth moving boards move left and right with respect to the first moving board. It is possible to follow automatically, and the second moving platen and the third moving platen are forcibly driven by the drive means to the displacement of the seam portion in the circumferential direction of the electric resistance welded pipe. By moving the holding frame in the circumferential direction of the electric resistance welded pipe by following the relative movement in this direction, it is possible to follow the seam portion. To
In addition, the present invention provides an excellent effect for online flaw detection, in which the probe can be swiftly and accurately followed and positioned to perform flaw detection, requiring almost no manpower.

[Brief description of drawings]

FIG. 1 is a conceptual view showing the device of the present invention in a state where it is stretched only to the left and right, FIG. 2 is a side view of the device of the present invention, FIG. 3 is a front view of the same, and FIG. 4 is IV of FIG. Fig. 5 is a partially enlarged view taken along line -IV, Fig. 5 is an enlarged front view of the holder, Fig. 6 is a side view of the same, Fig. 7 is an operation explanatory view, and Fig. 8 is a perspective view of a conventional device. 1 ... Ultrasonic flaw detector, 3 ... Motor, 11 ... Elevating frame, 12 ... Air cylinder 13,14,15,16 ... Movable plate, 20 ... Holding frame, 21 ... Suspending arm, 23 ... Upper arm 24 ... Lower arm , 25 ... Holder, 26a ... Air brake, 26b
... connecting piece 27a ... pulse motor, 27b ... _{Nishijo杆, B (B 1, B 2} ~B 6) ...
Probe

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Ota 1850 Minato, Wakayama, Wakayama Sumitomo Metal Industries Co., Ltd.Wakayama Works (72) Inventor Kengo Mishiro 1850, Minato, Wakayama, Wakayama Sumitomo Metal Industries Co., Ltd. Company Wakayama Works (72) Inventor Mineo Onishi 2-21-19 Isoji, Minato-ku, Osaka City, Osaka (56) References JP-A-61-134660 (JP, A) Jitsuko Sho-56- 25414 (JP, Y2)

Claims (1)

[Claims] 1. A sensor for detecting a positional deviation in the circumferential direction of a seam portion of an electric resistance welded pipe which is moved in the axial direction, and a probe for flaw detection of the seam portion, which are detected by the sensor. In the ultrasonic flaw detector of the electric resistance welded pipe, which is provided with a seam portion and a means for moving the probe to a position corresponding to the seam portion, the means for moving the probe moves up and down with respect to the transfer area of the electric resistance welded pipe. A vertically movable frame (11) movably supported, a first movable plate (13) movably supported by the vertically movable frame in an upper and lower direction orthogonal to the moving direction of the electric resistance welded pipe, and an electric resistance welded pipe. Second movable platen (14e), which is movably supported in the left and right directions orthogonal to the moving direction, and has a copying roller (14e) fixed to the lower part that follows the horizontal and vertical movements of the electric resistance welded pipe. ), A third movable platen (15) supported by the second movable platen (14) so as to be movable in the left-right direction, and the third movable platen (15). A fourth movable plate (16), which is movably supported in the upper and lower directions parallel to the first movable plate (13) with respect to the movable plate (15), and can be moved to and from the surface of the electric resistance welded pipe. A holding frame (20) provided with a probe, a copy roller (20e) provided in the lower part to follow the pipe circumferential direction, and a support frame (20) rotatably supported in the left-right direction with respect to the fourth moving platen (16), By forcibly moving the second movable platen (14) and the third movable platen (15) relative to each other in the left-right direction, the holding frame (20) is displaced in the seam position detected by the sensor. An ultrasonic flaw detector for an electric resistance welded pipe, which is provided with a driving means (14h, 15d, 14g) for tilting with respect to.