JP3336751B2 - Inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection apparatus that performs flaw detection in a spiral shape by using an ultrasonic probe that rotates around a tubular or round bar-shaped test body that is transported straight without rotating, and features and features thereof. What is required is that the position of the ultrasonic probe can be set arbitrarily in the positional relationship between the ultrasonic probe and the test piece, and the setting work can be done in a shorter time and easier than with conventional equipment, and the ultrasonic inspection with high accuracy The present invention proposes an apparatus aiming to perform the above.

[0002]

2. Description of the Related Art FIGS. 10, 11 and 12 show a conventional inspection apparatus. FIG. 10 is a cross-sectional view in the test-piece transport direction, FIG. 11 is another cross-sectional view in the test-piece transport direction like FIG. 10, and FIG. 12 is a cross-sectional view in a direction perpendicular to the test-piece transport direction. In the figure, reference numeral 1 denotes a tubular or round bar-shaped specimen,
Reference numeral 2 denotes an ultrasonic probe arranged around the test piece 1, 3 denotes a plate on which the ultrasonic probe 2 is mounted, 4 denotes a plate
The first cylinder 5 supporting the first cylinder 4
, A first flange provided on the upstream side with respect to the transport direction A of the test body 1 of the cylindrical body 5,
7 is a second flange provided on the downstream side of the cylindrical body 5, 8
Is a weir inscribed in the outer periphery of the test body 1 provided on the first flange 6 and the second flange 7, a first cover 9 for fixing the weir 8 to the first flange 6, and a tenth weir 8 The second cover 11 to be fixed to the second flange 7 is the specimen 1
An ultrasonic medium surrounded by the cylindrical body 5 and the weir 8, and an inlet 12 for feeding the ultrasonic medium 11. 1
3 is a second cylinder supporting the first cylinder 4, 14
Is a first groove whose distance from the center of the cylindrical body 5 changes continuously, 15 has a first groove 14, with respect to the transport direction A of the test body 1 that slides and guides the second cylinder 13. A first rotary plate provided on the upstream side, 16 is a second rotary plate provided on the downstream side, 17 is a shaft connecting the first rotary plate 15 and the second rotary plate 16 , and 18 is a first rotary plate. A support ring for slidingly supporting the rotary plate 15 and the second rotary plate 16;
Is a chain attached to the first cover 9, and 20 is a sprocket attached to the first flange 6 and engaged with the chain 19. Reference numeral 21 denotes a pin which is detachably attached to the first cover 9 and is inserted into the first flange 6 formed at predetermined intervals. Reference numeral 22 denotes a pin which is attached to the first cover 9 to prevent the pin 21 from dropping. This is the third cover to do.

Next, the operation will be described. The conventional inspection device is configured as described above, and performs a flaw detection inspection while rotating around the test body 1. The ultrasonic probe 2 arranged around the test body 1 is tested via the ultrasonic medium 11 introduced from the inlet 12 when the test body 1 is transported in the transport direction A and comes into contact with the cough 8. Ultrasonic waves are propagated to the body 1, thereby performing flaw detection inspection. When the outer diameter of the specimen 1 changes, the first cover 9 and the second cover 10 are removed.
Is replaced with one having a predetermined diameter. When a predetermined distance is to be obtained between the specimen 1 and the ultrasonic probe 2 after replacing the weir 8, the pin 21 is pulled out of the first flange 6 and the sprocket 20 is rotated. Through the first cover 9 to the first rotating plate 15, and rotates while being slid and supported by the support ring 18. The first rotary plate 15 and the second rotary plate 16 have a first groove 14 whose distance from the center of the cylindrical body 5 changes continuously.
Since the ultrasonic probe 2 is supported via the first cylinder 4 and the plate 3, the ultrasonic probe 2 moves up and down when the first rotating plate 15 rotates. Further, since the first cylinder 4 is inserted toward the center of the cylindrical body 5, the ultrasonic probe 2 moves only in the direction of the center of the cylindrical body 5. After a predetermined distance is obtained between the test body 1 and the ultrasonic probe 2, the pin 21 is inserted into the first flange 6, and a flaw detection inspection of the test body 1 having a predetermined outer diameter is performed.

[0004]

Since the conventional inspection apparatus is configured as described above, there are the following problems.
First, since the flaw detection inspection is performed while rotating around the test body 1, a centrifugal force is generated in the inspection device, and it is necessary to obtain an inspection device capable of withstanding the centrifugal force. Among the loads due to the centrifugal force generated in the ultrasonic probe 2, the plate 3, the first cylinder 4, and the second cylinder 13, the distance of the first rotary plate 15 from the center of the cylindrical body 5 changes continuously. Since the first groove 14 is provided, the cosine component of the tangent to the first groove 14 and the center line of the cylindrical body 5 is transmitted to the pin 21 via the first rotating body 15 and the first cover 9. . In order to increase the efficiency of the flaw detection inspection, it is necessary to increase the transport speed of the specimen 1 and increase the rotation speed of the inspection apparatus. Since the centrifugal force depends on the rotation speed and the distance from the rotation center, the rotation speed is increased. The centrifugal force also increases, and the load transmitted to the pin 21 also increases. In the above case, the outer diameter of the pin 21 is increased or a material having a higher strength is used, but if the outer diameter of the pin 21 is increased, a hole formed in the first flange 6 is formed. The diameter also needs to be increased. On the other hand, the pitch of the holes drilled in the first flange 6 is determined by a predetermined distance between the test body 1 and the ultrasonic probe 2, and the shorter the predetermined distance, the smaller the pitch of the holes. This is inconsistent with the case where the load transmitted to the pin 21 is increased and the diameter of the hole drilled in the first flange 6 needs to be increased. Here, if the number of holes is reduced by giving priority to the strength surface, the number of distances that can be set between the test body 1 and the ultrasonic probe 2 is reduced, so that the outer diameter of the test body 1 that can be inspected for flaw detection is reduced. The number of types has decreased, which has been a problem in management and operation. Conversely, if the number of pins 21 is increased in order not to reduce the type of outer diameter of the test body 1 that can be used for flaw detection, there has been a problem in terms of cost. The load due to the centrifugal force is first received by the first groove 14. Therefore, as described above, when the rotation speed is increased and the centrifugal force is increased, the load transmitted from the second cylinder 13 to the first groove 14 is also increased,
First groove 14 or second cylinder 1 depending on aging
3 was deformed, and a predetermined distance between the test body 1 and the ultrasonic probe 2 could not be obtained, which was a problem in terms of accuracy. Further, when a predetermined distance is obtained between the test body 1 and the ultrasonic probe 2, since the pin 21 is inserted into the first flange 6 as described above, the outer diameter of the test body 1 to be inspected for flaw detection is obtained. When there are many types, the number of holes to be drilled increases, and since it is necessary to consider the interference of each hole, the type of the outer diameter of the test body 1 that can be inspected for flaw detection is limited. This was also a problem in management and operation. If the type of the outer diameter of the specimen 1 is changed from the originally planned one, a predetermined distance between the specimen 1 and the ultrasonic probe 2 cannot be obtained, and There are problems in cost and management and operation, such as adding holes and increasing the number of pins 21 and, in some cases, remanufacturing the first flange 6.
Although the first rotary plate 15 and the second rotary plate 16 are slidably supported by the support ring 18, the first rotary plate 1 has a large frictional resistance because it is in surface contact over the entire circumference.
5 and the rotation of the second rotating plate 16 were hindered. Further, the metal powder separated from the surface of the test piece 1 entered the contact surface and hindered rotation as in the above. When obtaining a predetermined distance between the test body 1 and the ultrasonic probe 2,
When a large force is required, which affects the force for rotating the sprocket 20, a longer working time is required, which is also a problem in management and operation.

The present invention has been made in order to solve the above-mentioned problems, and a predetermined distance between a test body 1 and an ultrasonic probe 2 can be easily set in a short time, and an arbitrary distance can be set. An object of the present invention is to obtain an inspection device that can be set to a distance.

[0006]

An inspection apparatus according to the present invention comprises a housing having an inner diameter inserted into a cylindrical body and capable of passing a first cylinder and having a threaded portion on an inner surface, and a threaded portion of the housing. And a bolt fixed to the first cylinder, a slit cut on the side surface of the housing and capable of seeing the first cylinder from the side, and a scale provided beside the slit. It is.

According to the present invention, the housing is provided with a first notch, and the bolt is provided with a second notch.

Further, the present invention has a first rotary plate and a second rotary plate provided with a second groove.

Further, the present invention includes a rolling element provided on the first rotating plate and the second rotating plate and inscribed in the inner periphery of the support ring.

[0010]

The inspection apparatus according to the present invention has a housing having an inner diameter which is inserted into a cylindrical body and through which a first cylinder can pass, and which has a threaded portion on an inner surface thereof, and which is fitted to the threaded portion of the housing to form a first inspection device. By providing a bolt for fixing the cylinder, a slit cut on the side surface of this housing and allowing the first cylinder to be viewed from the side surface, and a scale provided beside the slit, the first flange is provided. There is no need to drill holes, and when a predetermined distance is obtained between the test body 1 and the ultrasonic probe 2, the distance can be set to an arbitrary distance.

In the inspection apparatus according to the present invention, the outer diameter of the test piece 1 is changed by providing the first notch in the housing and the second notch in the bolt, thereby changing the outer diameter of the test piece 1. When the distance between the probe and the ultrasonic probe 2 is reset, the distance can be easily set in a short time.

In the inspection apparatus according to the present invention, the first rotary plate and the second rotary plate are provided with the second groove, so that the first rotary plate 15 and the second rotary plate 16 and the support ring 18 are provided. Since the length of the contact portion becomes short, the frictional resistance becomes small, and the portion where the metal powder dispersed from the surface of the specimen 1 enters is reduced, so that the distance between the specimen 1 and the ultrasonic probe 2 is reduced. When a predetermined distance is obtained, the force for rotating the sprocket 20 can be reduced.

The inspection apparatus according to the present invention is provided with a rolling element provided on the first rotating plate and the second rotating plate and inscribed on the inner periphery of the support ring. The sliding portion of the rotating plate and the support ring is changed from sliding friction to rolling friction, so that the frictional resistance can be reduced. Further, there is almost no portion into which the metal powder separated from the surface of the test piece 1 enters. When a predetermined distance is obtained between the sprocket 20 and the ultrasonic probe 2, the force for rotating the sprocket 20 can be reduced.

[0014]

【Example】

Embodiment 1 FIG. 1 and 2 are views showing an embodiment of the present invention. FIG. 1 is a cross-sectional view in the specimen transport direction shown in A, and FIG. 2 is a cross-sectional view in a direction perpendicular to the specimen transport direction. In the drawing, reference numerals 1 to 20 denote the same or corresponding parts as those of the conventional apparatus. Reference numeral 23 denotes a housing which is inserted into the cylindrical body 5 and has an inner diameter through which the first cylinder 4 can pass and which has a threaded portion on the inner surface. A fixing bolt 25 is provided on a side surface of the housing 23 so that the first cylinder 4 can be seen. A scale 26 is provided beside the slit 24.

In the inspection apparatus configured as described above, when the outer diameter of the test body 1 changes and the setting of the predetermined distance between the test body 1 and the ultrasonic probe 2 is changed, the bolt 24 is loosened. The movement of one cylinder 4 is made free. By rotating the sprocket 20, the force is applied to the chain 1
9, the first cover 9, the first rotary plate 15 and the second rotary plate 16, and the first cylinder 4 via the second cylinder 13.
The ultrasonic probe 2 moves toward the center of the cylindrical body 5. Further, a slit 2 formed in the side surface of the housing 23
5, the first cylinder 4 is positioned at a predetermined distance between the specimen 1 and the ultrasonic probe 2 by aligning the position of the first cylinder 4 with the scale 26 provided next to the slit 25. Get. Therefore, the distance between the test body 1 and the ultrasonic probe 2 can be set to an arbitrary distance. In addition, even if the type of the outer diameter of the specimen 1 is changed from the originally planned one, the correspondence table between the scale and the outer diameter of the specimen 1 is separately prepared, so that additional processing and remanufacturing are not required. Can be used. Next, the load due to the centrifugal force generated in the ultrasonic probe 2, the plate 3, the first cylinder 4, and the second cylinder 13 due to the rotation at the time of the flaw detection inspection, the bolt 2
4 and the housing 23, the load is not transmitted from the second cylinder 13 to the first groove 14, and the first groove 14 or the second cylinder 13
Can be prevented from being deformed.

Embodiment 2 FIG. Specimen 1 in Example 1 above
When changing the setting of the predetermined distance between the ultrasonic probe 2 and
First, it was stated that the bolt 24 was loosened. The length of the threaded portion of the housing 23 needs to be equal to the radius of the specimen 1 to be inspected for flaws plus the height of the bolt 24. In the case where the range of the outer diameter of the specimen 1 to be subjected to the flaw detection is large, when changing the specimen 1 having the smallest outer diameter to the specimen 1 having the largest outer diameter, it is necessary to loosen the difference bolt 24 of the radius, The work time required for changing the outer diameter of the test body 1 increases, and there is a problem in terms of inspection efficiency.

3 and 4 show the housing 23 and the bolt 24.
FIG. 3 is a plan view showing a first notch 27 and a second notch 28, respectively. 5 and 6 are plan views showing the embodiment. FIG. 5 shows a state where the bolt 24 is loosened from the housing 23, and FIG. 6 shows a state where the bolt 24 is tightened. By providing the first notch 27 and the second notch 28, the maximum rotation angle of the bolt 24 when the bolt 24 is loosened can be obtained by Expression (1). Maximum rotation angle = 360 ° / number of cutouts (1)

Although the number of notches is provided at four positions in this embodiment, the number is determined by the thread pitch of the bolt 24. When the screw pitch is small, it is necessary to rotate the bolt 24 more times than when the screw pitch is large, so that the number of notches is reduced. However, when the screw pitch is small, it is easier to fit the bolt 24 into the housing 23 than in the case where the screw pitch is large. In any case, as can be seen from equation (1), the bolt 24
Does not need to be turned more than once, the work time involved in changing the outer diameter of the test specimen 1 is greatly reduced, and the inspection efficiency is improved.

Embodiment 3 FIG. In the first embodiment, the first rotary plate 15 and the second rotary plate 16 are slidably supported by the support ring 18 as in the conventional device. The rotation of the first rotating plate 15 and the second rotating plate 16 is hindered. Further, the metal powder separated from the surface of the test piece 1 enters the contact surface and hinders the rotation as in the above. These are Specimen 1
When a predetermined distance is obtained between the probe and the ultrasonic probe 2, this affects the force for rotating the sprocket 20, and when a large force is required, the work time for setting the predetermined distance increases. FIG. 7 is a cross-sectional view in a direction orthogonal to the test object transport direction. Reference numeral 29 denotes a second groove provided in the first rotary plate 15 and the second rotary plate 16. By providing the second groove 29, the length of the contact portion between the first rotary plate 15 and the second rotary plate 16 and the support ring 18 is reduced, and the first rotary plate 15 and the second rotary plate 1
The frictional resistance generated when 6 rotates is reduced. Furthermore, the portion where the metal powder separated from the surface of the test body 1 enters is reduced, and the rate of increase in frictional resistance is also reduced. Thereby, the force for rotating the sprocket 20 can be reduced, and the working time can be shortened.

Embodiment 4 FIG. By providing the second groove 29 in the first rotating plate 15 and the second rotating plate 16 in the third embodiment, the friction generated when the first rotating plate 15 and the second rotating plate 16 rotate. The example in which the influence of the resistance and the metal powder separated from the surface of the test piece 1 is reduced has been described. In the present embodiment, an example in which the influence is further reduced will be described. FIG. 8 is a cross-sectional view in a direction orthogonal to the test object transport direction, and 30 is the first rotating plate 15.
And rolling elements provided on the second rotating plate 16. Since the contact portions between the first rotating plate 15 and the second rotating plate 16 and the support ring 18 are changed from sliding friction due to surface contact to rolling friction due to the rolling elements 30, the first rotating plate 15 and the second rotating plate The frictional resistance generated when the wheel 16 rotates further decreases, and the effect of the metal powder is almost eliminated. Thereby, the force for rotating the sprocket 20 can be further reduced, and the working time can be further reduced.

Embodiment 5 FIG. FIG. 9 is a cross-sectional view in the test object transport direction. In the first embodiment, the slits 24 are provided in the housing 23, and the scales 26 are arranged beside the slits 24.
When the first cutout 27 is provided in the housing 23 as shown in the second embodiment, the scale 26 may be arranged in the first cutout 27 of the housing 23. In this case, the slit 24 may or may not be provided.

In the above description, the case where the present invention is applied to an ultrasonic flaw detection apparatus has been described. However, another flaw detection is performed spirally around a tubular or round bar-shaped test piece which is transported straight without rotating. Needless to say, it can be used for an inspection device.

[0023]

Since the present invention is configured as described above, it has the following effects.

Since the housing is inserted into the cylindrical body, the screw portion is provided on the inner surface of the housing, and the slit and the scale are provided, the distance between the test body 1 and the ultrasonic probe 2 can be arbitrarily set. It is effective in terms of manufacturing and management and operation. Furthermore, since the slide supporting portion does not receive the load due to the centrifugal force generated at the time of the flaw detection, deformation due to aging can be prevented, and the flaw detection with high accuracy can be maintained.

By providing the first notch and the second notch in the housing and the bolt inserted in the cylindrical body,
When the outer diameter of the specimen 1 changes and the distance between the specimen 1 and the ultrasonic probe 2 is reset, the amount of loosening the bolt from the housing can be reduced, and work can be easily performed in a short time. Inspection efficiency can be improved.

By providing the second groove in the first rotating plate and the second rotating plate, the frictional resistance when rotating the sprocket is reduced, and the rotating force is reduced. Efficiency can be improved.

By providing rolling elements on the first rotating plate and the second rotating plate, the sliding portion causes rolling friction, so that the frictional resistance when rotating the sprocket is reduced and the rotating force is reduced. In addition, workability is improved, and inspection efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a test sample conveying direction according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the first embodiment of the present invention, taken in a direction perpendicular to a test object transport direction.

FIG. 3 is a plan view of a housing according to a second embodiment of the present invention.

FIG. 4 is a plan view of a bolt according to Embodiment 2 of the present invention.

FIG. 5 is a plan view showing a second embodiment of the present invention in an open state of a housing and a bolt.

FIG. 6 is a plan view showing a state in which a housing and a bolt are fitted together according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a third embodiment of the present invention, taken in a direction perpendicular to the test object transport direction.

FIG. 8 is a cross-sectional view showing a fourth embodiment of the present invention, taken in a direction perpendicular to the test object transport direction.

FIG. 9 is a cross-sectional view of a fifth embodiment of the present invention in a test object transport direction.

FIG. 10 is a cross-sectional view of a conventional apparatus in a test object transport direction.

FIG. 11 is a cross-sectional view of a conventional apparatus in a test object transport direction.

FIG. 12 is a cross-sectional view showing a conventional apparatus in a direction perpendicular to a test object transport direction.

[Explanation of symbols]

Reference Signs List 1 test specimen, 2 ultrasonic probe, 3 plate, 4 first cylinder, 5 cylinder, 6 first cylinder, 7
Second cylinder, 8 cough, 13 Second cylinder, 1
4 first groove, 15 first rotating plate, 16 second rotating plate, 17 shaft, 18 support ring, 23 housing, 24 bolt, 25 slit, 26 scale, 27 first notch, 28 second Notch, 2
9 Second groove, 30 rolling elements.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-198753 (JP, A) JP-A-63-96550 (JP, A) JP-A-1-260359 (JP, A) JP-A 60-1987 233545 (JP, A) Japanese Utility Model 63-63,957 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01N 29/00-29/28 G01N 27/72-27/90

Claims (4)

(57) [Claims] An inspection apparatus for detecting a defect in a tubular or round bar-shaped test object, an ultrasonic probe rotating around the test object, and the ultrasonic probe being interposed via a plate. A supporting cylinder, a housing having an inner diameter through which the first cylinder can pass, and having a threaded portion on an inner surface;
A cylindrical body into which the housing is inserted, a bolt to be fitted into the housing, a slit formed in the housing, a scale provided beside the slit, and first and second attached to the front and rear of the cylindrical body. A first flange and a second flange, a weir attached to the first flange and the second flange, a second cylinder supporting the first cylinder, and a movement of the second cylinder. A first rotary plate and a second rotary plate provided with a first groove whose distance from the center of the cylindrical body changes continuously; and sliding the first rotary plate and the second rotary plate. An inspection apparatus comprising: a support ring for supporting; and a shaft connecting the first rotary plate and the second rotary plate. 2. The inspection device according to claim 1, wherein a first notch provided in the housing and a second notch in the bolt are provided. 3. The inspection apparatus according to claim 1, wherein the first rotary plate and the second rotary plate have a second groove. 4. The inspection apparatus according to claim 1, further comprising a rolling element provided on the first rotating plate and the second rotating plate and inscribed in an inner periphery of the support ring. .