JP3088646B2 - Probe holding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to flaw detection for a cylindrical member .
More specifically, the present invention relates to a probe holding device that follows a cylindrical surface of a cylindrical member.

[0002]

2. Description of the Related Art An ultrasonic flaw detector is known as a conventional cylindrical member defect detector. Weight 5
In an ultrasonic flaw detection test of a large cylindrical member having a diameter of 0 Ton or more, the cylindrical member is placed on a turning roller with the central axis being horizontal, and the cylindrical roller is rotated around the central axis by the turning roller to perform flaw detection. . The transducer is
The cylindrical member is gradually moved in the central axis direction of the cylindrical member in accordance with the rotation of the cylindrical member. Accordingly, the cylindrical member is spirally flawed by the probe.

[0003] However, in the conventional flaw detection method in which flaw detection is performed while rotating a cylindrical member with a turning roller, the end surface of the cylindrical member is firmly supported by a side roller,
It is necessary to detect flaws while reliably preventing lateral displacement in the direction of the central axis. In addition, in order to improve the flaw detection speed, it is necessary to increase the rotational drive speed of the cylindrical member by the turning roller. For this reason, when a large and heavy cylindrical member is subjected to ultrasonic flaw detection, particularly in a turning roller as an auxiliary device for ultrasonic flaw detection, a supporting mechanism and a rotation driving mechanism of the turning roller become complicated, and great durability is provided. Has been required, and there is a technical problem that costs are required.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional technical problems, and has the following configuration. The configuration according to the first aspect of the present invention includes a first base 10, a second base 15, and a base 11 in this order from the bottom.
And the mounting member 1 supported swingably on the base 11.
A probe holder for detecting flaws on the outer peripheral surface 1a side of the cylindrical member 1 by a probe 20 mounted on a mounting member 12, wherein the first base 10 is connected to a center axis of the cylindrical member 1. Axis feed device 14 for moving the second base 15 in the direction perpendicular to the center axis direction of the cylindrical member 1 with respect to the first base 10.
A probe driving device for raising and lowering the base 11 with respect to the second base 15; and a tilt angle adjusting device 24 for adjusting a tilt angle of the mounting member 12. Device. The probe of claim 2
2. The probe holding device according to claim 1, wherein 0 is elastically supported by the mounting member 12 via an elastic body 70.

[0005]

According to the first aspect of the present invention, first, the cylindrical member 1
Is placed on a turning roller with the central axis horizontal.

Next, the first base 10 is moved in the direction of the center axis of the cylindrical member 1 by driving the center axis direction feeding device 14 and the lifting drive device 18, and the probe holding device 2 is moved to the center axis of the cylindrical member 1. And the base 11
Is moved up and down with respect to the second base 15, so that the probe 20 is set at a predetermined height position and set at a flaw detection start position. Further, by driving the orthogonal direction feeder 16, the second base 15 is moved relative to the first base 10 in a direction orthogonal to the central axis direction of the cylindrical member 1, and the probe 20 is moved to the outer periphery of the cylindrical member 1. Adhere to the surface 1a.

In this state, without rotating the cylindrical member 1, the center axis direction feeder 14 is driven to move the first base 10 continuously in the central axis direction of the cylindrical member 1 while the probe is being moved. 20 is used to detect flaws on the outer peripheral surface 1a side of the cylindrical member 1. After detecting one line in the direction of the central axis of the cylindrical member 1, the probe 20 is moved downward (or upward) by a predetermined width to detect the next line. If a defect is detected, the same line is inspected for flaws and reconfirmed. In this way, when the mounting member 12 on which the probe 20 is mounted is vertically flaw-detected by the lifting drive device 18, that is, the flaw detection of the predetermined width Δ that allows flaw detection without rotating the cylindrical member 1 is completed, The cylindrical member 1 is rotated by a predetermined angle in accordance with a predetermined width Δ.

Thereafter, the mounting member 12 of the probe 20 is caused to follow the amount of rotation of the cylindrical member 1 by the lifting drive device 18 and is raised (or lowered) to the flaw detection end position, that is, a position adjacent to the predetermined width Δ. Then, the probe 20 is brought into close contact with the outer peripheral surface 1a of the cylindrical member 1 to perform the next flaw detection. In this manner, without rotating the cylindrical member 1, the flaw detection of the predetermined width Δ adjacent to the predetermined width Δ at which the flaw detection of the cylindrical member 1 is completed is performed, and the intermittent rotation and the predetermined The flaw detection for the width Δ is performed.

Here, the reason why the cylindrical member 1 is intermittently rotated by a predetermined angle (a predetermined width Δ in the circumferential direction) will be described. When the heavy cylindrical member 1 is rotated by the turning roller 6, the feed amount in one circumferential direction is reduced to the width between lines (about ３ of the width of the probe) and a small amount. Control is difficult because of inertia. Therefore, a relatively large movement of a predetermined angle (a predetermined width Δ in the circumferential direction) is given to the cylindrical member 1, and the attachment member 12 of the probe 20 is moved in accordance with the movement amount. Thus, the cylindrical member 1 is 1
If it rotates and flaw detection is performed on the entire circumference of the cylindrical member 1,
End the inspection work.

According to the second aspect, the probe 20 securely adheres to the outer peripheral surface 1 a of the cylindrical member 1 while the elastic body 70 is elastically deformed. When the probe 20 moves by one line, when the line is changed,
And the cylindrical member 1 is intermittently rotated in accordance with the predetermined width Δ and the probe 20 is moved in accordance with the previous flaw detection end position. .

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 show one embodiment of the present invention.
1 shows a probe holding device according to an embodiment. In FIG. 1, reference numeral 1 denotes a cylindrical member which is an object to be inspected.
Is mounted on a plurality of turning rollers 6 arranged at the front, rear, left and right of the center axis with the center axis being horizontal. Each of the turning rollers 6 is driven to rotate by a motor 7 which is a rotary drive source provided on the foundation 3 via a speed reduction device 8 so that the cylindrical member 1 can be rotated around a central axis.

The probe holding device 2 is arranged on a support 4 fixed to a foundation 3 and faces the outer peripheral surface 1 a of the cylindrical member 1. The probe holding device 2 includes a first base 10 disposed above the support base 4, a second base 15 disposed above the first base 10, and a second base 15 disposed above the second base 15. A probe 20 having a base 11 disposed thereon and a mounting member 12 supported at one end of the base 11 so as to be swingable, and mounted on the mounting member 12.
The flaw detection on the outer peripheral surface 1a side of the cylindrical member 1 is performed.

The first base 10 is provided with a central axis direction feeding device 1.
4 is attached, and the second base 15 is an axis orthogonal direction feeder 1.
6 is attached. The central axis direction feeding device 14 feeds the first base 10 in the forward and reverse directions in the central axis direction of the cylindrical member 1. The axis orthogonal direction feeding device 16 feeds the second base 15 in the direction orthogonal to the central axis direction of the cylindrical member 1 in the forward and reverse directions. The base 11 is the second
The base 11 is arranged on the base 15 via an elevating drive device 18 so that the base 11 can be driven up and down to a predetermined height position by the elevating drive device 18. The mounting member 12 includes a pin 22
The tilt angle is controlled by the tilt angle adjusting device 24.

The center axis direction feeder 14 is shown in FIGS.
The wheel 26 is rotatably supported by the first base 10 and rolls on the support 4 in the direction of the central axis of the cylindrical member 1 as shown in FIG.
And a rack 3 mounted on a support base 4 via a support 28.
0, the first base 10 rotatably supported by the
A pinion 32 that meshes with the first base 10.
And a motor 34 for driving the pinion 32 to rotate in the forward and reverse directions. By rotating the pinion 32 in the normal and reverse directions by the motor 34, the first base 10 moves along the rack 30 while the wheels 26 roll on the support base 4 so that the center axis of the cylindrical member 1 extends. Reciprocate in the direction.

As shown in detail in FIG. 5, the axis orthogonal direction feeder 16 is mounted on the first base 10 and a rack 38 mounted on the first base 10, and the second base 15 is connected to the axis orthogonal. A linear motion rail (not shown) for guiding in the direction, a pinion 40 rotatably supported by the second base 15 and engaged with the rack 38, and fixed to the second base 15 to rotate the pinion 40 in the normal and reverse directions. And a driving motor 42. actually,
If the motor 42 is driven to rotate in the forward and reverse directions, the worm 80 rotates and the worm wheel 82 meshing with the worm 80 rotates, so that the pinion 40 coaxial with the worm wheel 82 rotates. As a result, the second base 15 is
8 and moves back and forth in the direction orthogonal to the axis. An encoder 84 detects the number of rotations of the worm wheel 82 and detects the amount of movement of the second base 15.

As shown in FIG. 3, the lifting / lowering drive unit 18 includes a parallel link mechanism 44 disposed between the second base 15 and the base 11, and a vertically movable link mechanism 44 for extending and lowering the base 11. And a drive mechanism 45 for providing movement. In the parallel link mechanism 44, the lower end of one link 44a at the lower end is swingably supported by the second base 15 by a pin 46, and the lower end of the other link 44b at the lower end is a pin 48.
, So that it is swingably supported by the lower bracket member 50,
The upper end of one link 44c at the upper end is swingably supported on the base 11 by a pin 52, and the other link 4c at the upper end.
The upper end of the upper bracket member 56 is formed by the pin 54 at the upper end thereof.
It is supported swingably. Lower bracket member 50
Is slidably guided on a linear motion rail 36 on the upper surface of the second base 15 so as to be movable in the direction orthogonal to the axis as shown in FIGS. 5 and 6, and the upper bracket member 56 is connected to the base 11 as shown in FIG. Is slidably guided by a linear motion rail 51 on the lower surface of the lens so as to be movable in the direction orthogonal to the axis.

The drive mechanism 45 includes a ball nut 58 fixed to the lower surface of the lower bracket member 50 as shown in FIG.
a, a screw 58 b rotatably supported on the upper surface of the second base 15, a ball screw mechanism 58, a pair of bevel gears 59, and a motor 60. By driving the pair of bevel gears 59 and the screw 58b in the forward and reverse directions by the motor 60, the ball nut 58a and the lower bracket member 50 move forward and reverse in the direction orthogonal to the axis, so that the pair of lower end links 44a, The space at the lower end of 44b is reduced or expanded. As a result, the translation link mechanism 44 expands and contracts, so that the base 11 can be driven up and down. The parallel link mechanism 44 is symmetrically disposed on both sides in the direction of the central axis, so that the base 11 can be driven up and down stably.

The tilt angle adjusting device 24 includes a driven sprocket 62 fixed to the mounting member 12 coaxially with the pin 22 and a motor 64 mounted on the base 11, as shown in detail in FIG.
And a driving sprocket 66 rotatably supported on the base 11 and driven to rotate forward and reverse by a motor 64. A chain 68 is wound between the driven sprocket 62 and the driving sprocket 66. . Then, the motor 6
4, the driving sprocket 66 via the gear mechanism 67
Is driven forward and reverse, the driven sprocket 62 is driven forward and reverse via the chain 68,
The attachment member 12 integrated with the driven sprocket 62 and the pin 22 swings about the pin 22, and the inclination angle of the attachment member 12 is adjusted. Reference numeral 63 denotes an encoder that detects the rotation speed of the driving sprocket 66 and detects the inclination angle of the mounting member 12.

On the inclined upper surface side of the plate-shaped mounting member 12, a plurality of probes 20 are mounted at predetermined intervals in the vertical direction. Each probe 20 is attached to the tip of a holding member 20a as shown in FIG.
Are slidably penetrated through the hole 12a of the mounting member 12. Each probe 20 is externally mounted on each holding member 20a, and is elastically supported by an elastic body 70 composed of a coil spring interposed between the tip of each holding member 20a and the mounting member 12. ing.

When each probe 20 comes into close contact with the outer peripheral surface 1a of the cylindrical member 1, each elastic body 70 is appropriately elastically deformed. In FIG. 2, four probes 20 are shown attached to the mounting member 12 at predetermined intervals in the vertical direction, but the diameter of the cylindrical member 1 is determined by one vertical probe 20. In this case, the flaws may be detected in two directions, and the flaws may be detected by crossing the circumferential direction of the cylindrical member 1 with the two angled probes 20. It is sufficient if they are arranged so as to contact in the circumferential direction. In FIG. 2, the uppermost probe and the second probe 20 from the bottom are the vertical probe 20.
And the second probe 20 from the lower end and the top is the oblique probe 20. Of course, it is also possible to mount only one vertical probe 20 and detect the flaw only in the radial direction of the cylindrical member 1. Reference numeral 72 denotes a wiper mechanism for draining oil, which has a function of wiping a couplant for the probe 20.

Further, as shown in FIG. 2, a pair of position sensors a,
b, c, and d are arranged. The position sensors a and b arranged on the holding member 20a at the upper end are turned off together when the probe 20 at the upper end is in a free state, and the probe 20 is
When the elastic body 70 is appropriately deformed by being pressed by the outer peripheral surface 1a, only the upper position sensor a is turned ON, and when the elastic body 70 is excessively deformed by being pressed by the outer peripheral surface 1a of the cylindrical member 1. Both operate ON. Also, the holding member 20a at the lower end
The position sensors c and d arranged at the lower end of the probe 20
Are both OFF in the free state, and the outer peripheral surface 1 of the cylindrical member 1 is
a, only the upper position sensor c is turned on when the elastic body 70 is appropriately deformed by being pressed by a, and both are turned on when the elastic body 70 is excessively deformed by being pressed by the outer peripheral surface 1a of the cylindrical member 1. I do.

Next, the operation will be described. First, the cylindrical member 1 is placed on the turning roller 6 with the center axis horizontal. Next, the central axis direction feeding device 14 is driven to move the first base 10 in the central axis direction of the cylindrical member 1, and the probe holding device 2 is positioned at an end of the cylindrical member 1 in the central axis direction. In addition, the vertical drive device 18 is driven to raise and lower the base 11 with respect to the second base 15, so that the probe 20 is set at the flaw detection start position A as a predetermined height position. Further, the axis orthogonal direction feeder 16 is driven to move the second base 15 with respect to the first base 10 in a direction orthogonal to the central axis direction of the cylindrical member 1, and each probe 20 is moved to the cylindrical member 1. It is brought into close contact with the outer peripheral surface 1a. At this time, the elastic bodies 70 supporting the probes 20 are elastically deformed.

In this state, the position sensors a, b, c, d
Is confirmed, and each probe 20 is connected to the outer peripheral surface 1 of the cylindrical member 1.
It is checked whether or not a proper pressure is applied to a in a good contact state. First, it is checked whether the signals of the position sensors a, b, c, and d are ON or OFF, and as shown in Table 1 below, the axis orthogonal direction feeding device 16 or the inclination angle adjusting device 24 is set to the treatment column. Is appropriately driven in accordance with the description in the above.
That is, the second base 15 or the mounting member 12 is appropriately driven based on the results of Table 1, and the state of No. 1, that is, the position sensors a and c are ON and the position sensors b and d are OFF, Appropriate pressing force is applied to each probe 20 against the outer peripheral surface 1a of the cylindrical member 1. When only the position sensor b, only the position sensor d, or only the position sensors b and d are ON, it indicates an abnormality.

The flaw detection operation is started from the state of No. 1 in Table 1. That is, without rotating the cylindrical member 1, the central base direction feeder 14 is driven, and the first base 10 is continuously moved in the central axis direction of the cylindrical member 1 by the respective probes 20. The outer peripheral surface 1a side of the cylindrical member 1 is inspected for flaws. This state is shown in FIG.

[0025]

[Table 1]

After detecting one line in the direction of the central axis of the cylindrical member 1, the probe 20 is moved downward (or upward) by a predetermined width δ (specifically, 3/4 of the width of one probe 20). Move to) and perform flaw detection for the next line. If a defect is detected, the same line is inspected for flaws and reconfirmed. The flaw detection of the same line can be easily performed by driving the center axis direction feeder 14 without moving the probe 20 by a predetermined width δ and moving the first base 10 in the center axis direction of the cylindrical member 1. It can be carried out. A predetermined width Δ (200 to 200) that the mounting member 12 on which the probe 20 is mounted can be moved up and down by the lifting drive device 18.
When the flaw detection of a predetermined width Δ that can be detected without rotating the cylindrical member 1 is completed, the cylindrical member 1 is intermittently rotated by a predetermined angle in accordance with the predetermined width Δ. At that time, the motor 7 is driven, and the cylindrical member 1 is rotated by each turning roller 6. The rotation of the cylindrical member 1 by a predetermined angle can be detected by an encoder (not shown).

Thereafter, the mounting member 12 of the probe 20 is caused to follow the intermittent rotation amount of the cylindrical member 1 by the lifting / lowering drive device 18, and the position corresponding to the flaw detection end position, that is, the position adjacent to the predetermined width Δ. To the next flaw detection. When the cylindrical member 1 is intermittently rotated by a predetermined angle to drive the lifting / lowering drive device 18, the signals of the position sensors a, b, c, and d are checked again based on Table 1 above. The probe 20 is brought into close contact with the outer peripheral surface 1a of the cylindrical member 1 and the front and rear positions and inclinations of the attachment member 12 of the probe 20 with respect to the cylindrical member 1 are controlled so that flaw detection is always performed in a constant state. In this manner, without rotating the cylindrical member 1 as shown in FIG. 9, the flaw detection for the predetermined width Δ adjacent to the predetermined width Δ where the flaw detection of the cylindrical member 1 is completed is performed, and the flaw detection for the predetermined width Δ is successively performed. Perform flaw detection. The signals from the position sensors a, b, c, and d are checked when the probe 20 is scanned along the line in the central axis direction.
It can also be performed when the line to be flawed is changed to the next line.

Here, the cylindrical member 1 is set at a predetermined angle (200 to
The reason for intermittently rotating by a predetermined width Δ) in the circumferential direction of about 300 mm will be described. Cylindrical member 1 that is heavy
Is rotated by the turning roller 6, the amount of one feed in the circumferential direction is set to a small amount such as 3/4 (specifically, about 15 ± 2 mm) of the line interval, that is, the width of the probe. Is difficult to control due to inertia. Therefore,
A relatively large movement is given to the cylindrical member 1 by a predetermined angle (a predetermined width Δ in the circumferential direction of about 200 to 300 mm), and the attachment member 12 of the probe 20 is moved following the movement amount.

In this way, when the cylindrical member 1 makes one rotation and the flaw detection is performed on the entire circumference of the cylindrical member 1, the flaw detection operation is completed. Reference numeral 74 shown in FIG. 8 denotes an optical sensor for detecting the circumferential origin, which detects that the cylindrical member 1 has made one rotation. The results of the flaw detection are graphically displayed as a defect distribution diagram and a defect cross-sectional view, so that the defect status can be objectively confirmed.

[0030]

As will be understood from the above description,
ADVANTAGE OF THE INVENTION According to the probe holding | maintenance apparatus which concerns on this invention, the whole surface flaw detection is attained by one rotation of a cylindrical member, without rotating a cylindrical member at high speed at the time of a flaw detection of a cylindrical member. As a result, the structures of the support mechanism and the rotation drive mechanism for the heavy cylindrical member are remarkably simplified, and the durability thereof is sufficiently ensured. In addition, when a defect is detected during a flaw detection operation, the same line can be flaw-detected again to easily check for a defect.

[Brief description of the drawings]

FIG. 1 is a diagram showing an arrangement of components of a probe holding device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a probe and a mounting member.

FIG. 3 is a side view showing the probe holding device.

FIG. 4 is a perspective view showing the same central axis direction feeder.

FIG. 5 is a perspective view showing the same axis orthogonal direction feeder.

FIG. 6 is a perspective view showing a drive mechanism of the lifting drive device.

FIG. 7 is a perspective view showing the tilt angle adjusting device.

FIG. 8 is an explanatory diagram of the same operation.

FIG. 9 is an explanatory view of the operation.

[Explanation of symbols]

1: cylindrical member, 1a: outer peripheral surface, 6: turning roller,
10: first base, 11: base, 12: mounting member, 14:
Central axis direction feeder, 15: second base, 16: axis orthogonal direction feeder, 18: lifting drive, 20: probe,
24: tilt angle adjusting device, 70: elastic body.

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01N 29/00-29/28

Claims (2)

(57) [Claims] 1. A first base (10) and a second base (15).
And a base (11) in order from the bottom , a mounting member (12) swingably supported by the base (11), and a probe (20) mounted on the mounting member (12). A probe holding device for flaw detection on the outer peripheral surface (1a) side of the cylindrical member (1), wherein the first base (10) is moved in the central axis direction to move the first base (10) in the central axis direction of the cylindrical member (1). The device (14) and the second base (15) are connected to a cylindrical member (1).
An axis orthogonal direction feeder (16) for moving the base (11) with respect to the second base (15) in a direction orthogonal to the center axis direction of the first base (10); A probe holding device comprising: a driving device (18); and a tilt angle adjusting device (24) for adjusting a tilt angle of the mounting member (12). 2. The probe holding device according to claim 1 , wherein the probe (20) is elastically supported by the mounting member (12) via an elastic body (70).