JPH08304351A - Centering copying device for ultrasonic flaw detector - Google Patents

Abstract

PURPOSE: To prevent the bias load from being added to a bearing rolled on the copying guide of the copying mechanism of a probe holder or the copying guide. CONSTITUTION: In this ultrasonic flaw detector, while an electric resistance welded tube 16 is longitudinally moved just after welded in a manufacturing line for minor diameter electric resistance welded tube, a flaw detection is performed for an electric resistance welded part by angle beam incidence with the welded part between within a flaw detecting water tank 2. Clamp rollers 17, 17a opened and closed through link mechanisms by a driving mechanism for centering and clamping a material to be inspected are provided in the flaw detecting water tank 2, rotating fixed cores concentric to the material to be inspected are provided on the inlet and outlet sides of the flaw detecting water tank 2, and the U-shaped extended plates 29, 29a of fixing plates 19, 19a for probe holders 18 are fitted to the copying discs 28, 28a of the rotating fixed cores to copy them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a probe holder of an ultrasonic flaw detector for detecting defects such as a welded portion of an electric resistance welded steel pipe that moves straight on a small diameter electric resistance welded steel pipe production line, which is concentric with a test material. The present invention relates to a centering copying device for an ultrasonic flaw detector that accurately copies a circumference.

[0002]

2. Description of the Related Art Generally, in order to inspect defects such as welds of small-diameter ERW steel pipes by ultrasonic flaw detection, online inspection of ERW welds on the production line immediately after welding and There is a method in which the electric resistance welded steel pipe is cut to a predetermined length and straightened after bending, the end chamfering is finished, the surface is inspected, and then the flaw detection of the electric resistance welded portion is performed off-line. The purpose of the online ultrasonic flaw detection immediately after welding is to detect welding defects such as unwelded welds, penetrator and bead cutting defects that occur in the welded portion, and prevent frequent occurrence of defects. In addition, ultrasonic flaw detection after the completion of surface inspection and the like is the final inspection for the purpose of ensuring the quality of small-diameter ERW steel pipes, and the flaw detection method is often straight pipe feed or probe rotation type.

Ultrasonic flaw detection for flaws such as electric resistance welded portions that move straight at a pipe-making speed in a small-diameter electric resistance welded steel pipe production line uses a local water immersion method or a total immersion water immersion method. For example, Japanese Laid-Open Patent Publication No. 56-49955 discloses high-sensitivity detection for each defect such as an inner surface defect and an outer surface defect such as a welded portion, and the incident angle of ultrasonic waves is different. A plurality of different probes are arranged around the small-diameter ERW steel pipe, and a plurality of these different probes are obliquely incident in the circumferential direction of the small-diameter ERW steel pipe to detect defects. A water immersion method is disclosed. In addition, for the ultrasonic flaw detection series (2) edited by the Japan Iron and Steel Institute and the ultrasonic flaw detection method for welded steel pipes,
The submersion method to detect flaws in the welded area and its vicinity, the pipe and the manipulator (copying mechanism section including the probe holder) are arranged concentrically, and the weld bead is detected by an optical sensor such as a TV camera to remove the manipulator. A method of following the welding bead to follow the circumferential direction and a method of pipe spiral feed total immersion are disclosed. However, the pipe spiral feed total immersion method is rarely used recently due to its low processing capacity.

In the conventional ultrasonic flaw detection method in a production line for small-diameter ERW steel pipes, it is premised that the pipe and the manipulator (the copying mechanism portion including the probe holder) are concentric. However, generally, in the online ultrasonic flaw detection on the production line immediately after welding, the ultrasonic flaw detector is generally installed at a position after the water cooling zone after welding or in the sizer roll. When installing an ultrasonic flaw detector inside the sizer roll, the pipe is regulated by the front and rear sizer rolls, so there is no vertical or horizontal deflection of the pipe, and the pipe and manipulator (copying mechanism part including the probe holder) Can always maintain a stable concentricity.

However, in recent years, ultrasonic flaw detection of a welded portion of a small-diameter electric resistance welded steel pipe has a high detection sensitivity for each defect such as an inner surface defect and an outer surface defect of the welded portion. In addition, a plurality of probes having different incident angles of ultrasonic waves are used to form multiple channels, and the manipulator becomes long in the longitudinal direction of the line, making it difficult to dispose the manipulator in the sizer roll. Most of the ultrasonic flaw detectors installed so far are installed before the sizer roll, and pinch rolls are placed on the inlet and outlet sides of the flaw detection water tank in order to regulate the runout of the pipe. In reality, it is often not perfect.

When performing ultrasonic flaw detection online in a production line for small diameter electric resistance welded steel pipes, the ultrasonic flaw detector is generally placed after the water cooling zone, and is moved straight by a pinch roll provided on the inlet / outlet side of the flaw detection water tank. Although the deflection of the small diameter electric resistance welded steel pipe is regulated, as described above, recently, the number of channels of the probe has been increased in order to increase the detection sensitivity, and the distance between the pinch rolls on the inlet and outlet sides has become considerably long. On the production line,
Although the welding speed of the welder and the straightening speed of the sizer are synchronized, the welding speed and the straightening speed are not synchronized due to slight wear of the sizer rolls, and the pipe may vibrate vertically and horizontally between the pinch rolls. The manipulator of the ultrasonic flaw detector cannot be overhanged in the case of a small diameter electric resistance welded steel pipe, so it is mechanically set in advance so as to be concentric with the pipe to be inspected. Therefore, when the tube shake occurs, the incident angle of refraction of the oblique probe deviates from the specified angle, deviates from the proper flaw detection sensitivity, and overdetection or oversight occurs.

As shown in FIG. 7, the copying mechanism of the probe holder of the ultrasonic flaw detector on-line for the small diameter electric resistance welded steel pipe does not mean that the probe holder comes into contact with the small diameter electric resistance welded steel pipe 61 for tracing. Instead, the bearing 65 mounted on the fixed plate 64 of the probe holder rolls on the copying guide 63 installed on the reference plate 62 installed concentrically with the small diameter electric resistance welded steel pipe 61. In the figure, 66 is an optical sensor for detecting the welding bead 67 of the small diameter electric resistance welded steel pipe 61, 68 is a clamp roller for the small diameter electric resistance welded steel pipe 61, 69 is a servo motor, 70 is a chain, and 71 is counter balance.

[0008]

As shown in FIG. 8, the tracing mechanism of the probe holder of the ultrasonic flaw detector has a center of gravity G of the probe holder 72 and a pulling force P of the counter balance 71.
The bending moment M acts on the copying guide 63 because the positions of are different. Further, as shown in FIG. 9, in the ultrasonic flaw detector, the copying guide 63 is tilted to one side due to the limitation of the installation space, but the probe holder 72 is basically left-right copying around the vertical line. For this reason, the position of the bearing 65 of the fixed plate is moved by L from the center of the probe holder 72. Therefore, the center of gravity G of the probe holder 72 is
And the position of the bearing 65 of the fixed plate of the probe holder 72 do not coincide with each other, and G × L twist occurs, and the bearing 6
Unbalanced load was applied to No. 5, resulting in looseness and damage to the bearing 65, and a large amount of maintenance man-hours and repair costs were spent.

An object of the present invention is to prevent an eccentric load on a bearing or a profile guide rolling on the profile guide of the profile mechanism of the probe holder, and to fix the center of rotation of the profile to an ultrasonic flaw detector. To provide a centering copying device.

[0010]

[Means for Solving the Problems] The inventors of the present invention have conducted earnest research to achieve the above object. As a result, a clamp roller for centering and clamping the material to be inspected is provided in the flaw detection water tank, and a rotatable fixed core having the same axis as the material to be inspected is provided on the inlet and outlet sides of the flaw detection water tank. By fitting the U-shaped extension plate of the fixed plate to the copying disk of the rotary fixed core and copying the same, a U-shaped extension plate for a bearing or a copying guide rolling on the copying guide of the copying mechanism of the probe holder can be formed. The inventors have reached the present invention by investigating that an unbalanced load can be prevented.

That is, according to the present invention, in a small-diameter electric resistance welded steel pipe production line, the electric resistance welded steel pipe is moved in the longitudinal direction immediately after welding while the welded portion is sandwiched in the flaw detection water tank, and the oblique angle incidence is performed to detect the electric resistance welded welded portion. In an ultrasonic flaw detector that performs the above, a clamp roller that opens and closes via a link mechanism by a drive mechanism that centers and clamps the material to be inspected in the water tank for flaw detection is provided Is provided, and the U-shaped extension plate of the fixing plate of the probe holder is fitted to the copying disk of the rotating fixed core to make it follow the centering copying of the ultrasonic flaw detector. It is a device.

[0012]

According to the present invention, by providing the clamp roller which opens and closes via the link mechanism by the drive mechanism for centering and clamping the test material in the flaw detection water tank, the drive mechanism is operated to clamp through the link mechanism. If the test material is clamped by opening and closing the roller, the test material matches the mill core in the flaw detection water tank. Further, in the present invention, a rotary fixed core coaxial with the material to be tested is provided on the inlet / outlet side of the flaw detection water tank, and a U-shaped extension plate connected to the fixed plate of the probe holder is used as a contour circle of the rotary fixed core. By fitting the probe holder, the probe holder becomes concentric with the test material. Therefore, if an optical sensor such as a TV camera detects the weld bead of the material to be inspected and the fixing plate of the probe holder is moved in the circumferential direction with reference to the rotating fixed core, it will be used as a copying guide or bearing. The probe holder can be made to follow the weld bead of the material to be tested without imposing an eccentric load, maintaining proper flaw detection sensitivity and suppressing yield deterioration due to over-detection. The reliability of the flaw detection test can be improved by eliminating it.

The opening / closing mechanism of the clamp roller for clamping the material to be inspected is not particularly limited as long as the material to be inspected can be clamped concentrically with the mill core in the flaw detection water tank, but is not particularly limited. It is common to open and close the clamp roller via a link mechanism by a drive mechanism. Further, the rotary fixed core provided on the inlet / outlet side of the flaw detection water tank is not particularly limited as long as it can be fitted with the extension plate of the fixed plate of the probe holder, but by providing a donut type copying disk, the probe holder can be provided. Even if the angle of the fixed plate changes, it is possible to easily fit the U-shaped extension plate of the fixed plate to the donut-shaped copying disk of the rotary fixed core.

[0014]

【Example】

Embodiment 1 Hereinafter, details of the present invention will be described with reference to FIGS. 1 to 6 showing an embodiment. 1 is a plan view of a clamp mechanism provided in a flaw detection water tank of the present invention, FIG. 2 is a side view of the same clamp mechanism, and FIG. 3 is a schematic side view of a centering copying device of an ultrasonic flaw detector of the present invention. 5 is a front view showing a state where the probe holder of the centering copying device of the ultrasonic flaw detector is raised, FIG.
FIG. 6 is an enlarged side view of the rotary fixed core on the entry / exit side of the flaw detection water tank with a part thereof cut away, and FIG. 6 is a front view of a state in which the probe holder of the centering copying device of the ultrasonic flaw detector of the present invention is centered. .

1 to 6, reference numeral 1 denotes a base on which the flaw detection water tank 2 is placed, and although not shown, it can be adjusted vertically and horizontally. 3, 3a is base 1
Cylinders mounted on the cylinder holders 4 and 4a fixed to the lower part of the
Is connected to pin blocks 8 and 8a fixed to linear guides 7 and 7a which are movable along rails 6 and 6a fixed to the lower part of the base 1 in parallel with the mill line. A stay 9 is fixed to the lower center of the base 1, and a housing 10 is fixed to the stay 9. 11, 11a are bearings 12, 12a and 1 of the base 1 and the housing 10.
Two rotary shafts are supported by the shafts 3 and 13a, and the lower portions of the two rotary shafts 11 and 11a are connected to the pin blocks 8 and 8a via the bending link plates 14 and 14a. Also,
One end of each of the two clamps 15 and 15a is fixed to the upper end of each of the two rotary shafts 11 and 11a. At the other end of each of the two clamps 15 and 15a, a pair of clamp rollers 17 having the same horizontal direction as the mill core of the small diameter electric resistance welded steel pipe 16,
17a is erected rotatably.

By operating the cylinders 3 and 3a to move the piston rods 5 and 5a forward, the pin blocks 8 and 8a are stayed by the linear guides 7 and 7a and the rails 6 and 6a.
2 in each direction via the refraction link plates 14 and 14a.
The rotary shafts 11 and 11a of the book rotate and the clamps 15 and 15
The clamp rollers 17 and 17a provided upright on a are released.
On the contrary, when the cylinders 3 and 3a are operated to retract the piston rods 5 and 5a, the pin blocks 8 and 8a are moved in the direction opposite to the stay 9 by the linear guides 7 and 7a and the rails 6 and 6a, and are bent. The two rotary shafts 11 and 11a rotate via the link plates 14 and 14a, respectively, and the clamp 15 and
Clamp rollers 17, 17a provided upright on 15a clamp the small-diameter electric resistance welded steel pipe 16 so that the small diameter electric resistance welded steel pipe 16 matches the mill core in the flaw detection water tank 2.

Reference numeral 18 is a probe holder, which is held by fixed plates 19 and 19a and a fixed pipe 20, and 21, 2
1a is a bearing provided on the fixed plates 19 and 19a,
Reference numerals 22 and 22a denote copying guides installed on the reference plates 23 and 23a, and the probe holder 18 has bearings 21 and 21a.
Copy guide 2 of the reference plates 23, 23a via a
It is held by 2, 22a. Numerals 24 and 24a are holding frames fixed to the base 1 on the entry / exit side of the flaw detection water tank 2 by bolts, and 25 and 25a are holding plates supported by the holding frames 24 and 24a, which are cylindrical pipes 27 through bearings 26 and 26a. 27a is rotatably held. 28, 2
Reference numeral 8a is a donut-shaped copying disk fixed to the ends of the cylindrical pipes 27, 27a on the side of the flaw detection water tank 2.

29 and 29a are fixed plates 19 and 19a.
Is a U-shaped extension plate connected to the lower part of the U-shaped extension plate, the lower circular arc portion of the U-shaped extension plate 29, 29a is a copy disk 28, 28.
When fitted in a, the probe holder 18 is concentric with the small diameter electric resistance welded steel pipe 16. Further, the lower circular arc portion of the U-shaped extension plates 29, 29a is a copy disk 28,
In the state fitted in 28a, the bearings 21 and 21a and the copying guides 22 and 22a are free, and the copying of the fixed plates 19 and 19a is based on the core of the copying disks 28 and 28a. Further, as shown in FIGS. 4 and 5, the fixing plates 19 and 19a and the U-shaped extension plate 2 are provided.
When 9, 29a is raised, the fixing plate 19,
Reference numeral 19a designates bearings 21, 21a and copying guides 22, 2
Bearings 21 and 21a so as to be supported by 2a
There is a degree of freedom in mounting.

Reference numerals 30 and 30a denote holding plates 25 and 25a.
Vertical adjustment bolts 31, 31a are also horizontal adjustment bolts for the holding plates 25, 25a.
The centering of 7a is performed by the clamp roller 1 in the water tank 2 for flaw detection.
7 and 17a are clamped with a polishing round bar instead of the small diameter electric resistance welded steel pipe 16, and the core of the polishing round bar is measured by using a core measuring jig (not shown) to adjust the vertical adjustment bolts 30 and 30a and the left and right adjustment bolts 31 and 31a. Adjust the cylindrical pipe 27, 27a
The copying discs 28 and 28a of FIG. Reference numeral 32 denotes an optical sensor such as a television camera for detecting the welding bead of the small diameter electric resistance welded steel pipe 16 protruding from the fixed plate 19 to the entry side of the small diameter electric resistance welded steel pipe 16.

By virtue of the above configuration, the cylinders 3, 3a are provided prior to ultrasonic flaw detection of the small diameter electric resistance welded steel pipe 16.
Is operated to retract the piston rods 5 and 5a, and the pin blocks 8 and 8a are moved to the linear guides 7 and 7a and the rails 6 and 6.
The clamp roller 17 which is moved in the direction opposite to the stay 9 by a and rotates the two rotating shafts 11 and 11a via the refraction link plates 14 and 14a, and is erected on the clamps 15 and 15a in the flaw detection water tank 2. , 17a in place of the small diameter electric resistance welded steel pipe 16 and clamp a polishing round bar. Then, while measuring the core of the polishing round bar using a core measuring jig (not shown), the vertical adjustment bolts 30 and 30a and the left and right adjustment bolts 31 and 31a are adjusted to copy the circular disks 28 and 28 of the cylindrical pipes 27 and 27a.
Adjust a to be concentric with the polishing rod. Cylindrical pipe 27, 27
When the adjustment of the copying disks 28, 28a of "a" is completed, the cylinders 3, 3a are operated to move the piston rods 5, 5a forward, and the pin blocks 8, 8a are stayed by the linear guides 7, 7a and the rails 6, 6a. Direction, and two rotary shafts 11 and 11a are respectively provided through the refraction link plates 14 and 14a.
By rotating the pair of clamps 15 in the flaw detection water tank 2,
The clamp of the polishing round bar by the clamp rollers 17 and 17a provided upright on 15a is released, and the polishing round bar is removed.

After that, the U-shaped extension plate 2 connected to the lower portions of the fixing plates 19 and 19a of the ultrasonic flaw detector.
By fitting the lower circular arc portions of 9, 29a to the circular plates 28, 28a, the fixing plates 19, 1, for the small-diameter ERW steel pipe 16 can be fitted.
The probe holder 18 held by 9a and the fixed pipe 20 becomes concentric, and preparation for ultrasonic flaw detection is completed. When the production of the small diameter electric resistance welded steel pipe 16 is started, the cylinders 3 and 3 are
a is operated to retract the piston rods 5 and 5a, and the pin blocks 8 and 8a are connected to the linear guides 7 and 7a and the rail 6,
6a moves in the direction opposite to the stay 9 and rotates the two rotary shafts 11 and 11a via the refraction link plates 14 and 14a, respectively, and the pair of clamps 15 and 1 in the flaw detection water tank 2 are rotated.
The small-diameter electric resistance welded steel pipe 16 which is linearly moved concentrically with the mill core is clamped by the clamp rollers 17 and 17a provided upright on 5a.

Then, the optical sensor 32 detects the welding bead of the small diameter electric resistance welded steel pipe 16, and the fixing plates 19 and 19a.
And the probe holder 1 held by the fixed pipe 20.
8 is moved in the circumferential direction with the cores of the disks 28, 28a as the reference, the probe holder 18 becomes the small-diameter electric resistance welded steel pipe 1
Since the scanning operation is performed along the core of 6, the flaw detection sensitivity can be maintained appropriately, overdetection can be prevented, yield deterioration can be suppressed, and overlooking can be prevented, and the reliability of the flaw detection test can be improved. Further, in a state where the lower arc portions of the U-shaped extension plates 29, 29a of the ultrasonic flaw detector are fitted in the copying disks 28, 28a, the bearings 21, 21a and the copying guides 22, 22a are fixed in a free state. Plates 19, 1
In the copying of 9a, since the cores of the copying disks 28, 28a are used as a reference, the copying guide 2 accompanying an eccentric load of the probe holder 18 or the like.
2, 22a and the bearings 21 and 21a are not damaged, and the copying guides 21 and 22a and the bearing 2 are not damaged.
It is possible to significantly reduce the repair man-hours and repair costs of 0 and 20a.

[0023]

As described above, according to the present invention,
The centering of the ultrasonic flaw detector for online ultrasonic flaw detection of small diameter ERW steel pipes can be maintained stably, and the damage of the guide guide and bearing due to the twist of the welding bead is eliminated, and the man-hours and repair cost of the guide guide and bearing are reduced. It can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a clamp mechanism provided in a flaw detection water tank of the present invention.

FIG. 2 is a side view of the clamp mechanism provided in the flaw detection water tank of the present invention.

FIG. 3 is a schematic side view of a centering copying device of the ultrasonic flaw detector of the present invention.

FIG. 4 is a front view showing a state where a probe holder of the centering copying device of the ultrasonic flaw detector is raised.

FIG. 5 is a partially cutaway enlarged side view of the rotary fixed core on the entry / exit side of the flaw detection water tank.

FIG. 6 is a front view showing a state where the probe holder of the centering copying device of the ultrasonic flaw detector of the present invention is centered.

FIG. 7 is a schematic explanatory view of a copying mechanism of a conventional ultrasonic flaw detector.

FIG. 8 is an explanatory diagram of a bending moment and its occurrence in a conventional copying mechanism.

FIG. 9 is an explanatory diagram of generation of an unbalanced load on a bearing of a conventional copying mechanism.

[Explanation of reference numerals] 1 base 2 water tank for flaw detection 3, 3a cylinder 4, 4a cylinder holder 5, 5a piston rod 6, 6a rail 7, 7a linear guide 8, 8a pin block 9 stay 10 housing 11, 11a rotating shaft 12, 12a, 13, 13a Bearing 14, 14a Refractive link plate 15, 15a Clamp 16, 61 Small-diameter ERW steel pipe 17, 17a, 68 Clamp roller 18, 72 Probe holder 19, 19a, 64 Fixed plate 20 Fixed pipe 21, 21a , 26, 26a, 65 Bearing 22, 22a, 63 Copying guide 23, 23a, 62 Reference plate 24, 24a Holding frame 25, 25a Holding plate 27, 27a Cylindrical pipe 28, 28a Copying disk 29, 29a U-shaped extension plate 30, 30a Vertical adjustment bolt 31, 1a lateral adjusting bolt 32,66 optical sensor 67 weld bead 69 servo motor 70 chain 71 counter balance

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masashi Kita 1850 Minato, Wakayama, Wakayama Sumitomo Metal Industries, Ltd. Wakayama Works (72) Inventor Shinji Toyokawa 1850, Minato, Wakayama Sumitomo Metal Industries, Ltd. Inside the Wakayama Works (72) Inventor Takayuki Tanisho 1850 Minato, Wakayama, Wakayama Sumitomo Metal Industries, Ltd. Inside the Wakayama Works (72) Toshio Tanahashi 2-2-119, Isoji, Minato-ku, Osaka, Osaka In the company

Claims (1)

[Claims] 1. In a small-diameter electric resistance welded steel pipe production line, the electric resistance welded steel pipe is moved in the longitudinal direction immediately after welding, and the welded portion is sandwiched in a flaw detection water tank to obliquely enter to perform flaw detection on the electric resistance welded portion. In the ultrasonic flaw detector, a clamp roller that opens and closes via a link mechanism by a drive mechanism that centers and clamps the material to be inspected in the water tank for flaw inspection is provided, and the same axis as the material to be inspected is rotationally fixed on the inlet and outlet sides of the water tank for flaw inspection. A centering and copying device for an ultrasonic flaw detector, wherein a core is provided, and a U-shaped extension plate of a fixed plate of the probe holder is fitted to the copying disk of the rotary fixed core to make the copy.