JPH09243613A - Inspection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably detect the different diameter of a round rod by providing a roller at a position eccentric from the shafts of a pair of the gears provided before and behind a housing to bring the same into contact with the round rod and providing scales and a fixed gear for aligning and locking the roller. SOLUTION: A pair of gears 8 are provided before and behind a housing 3 and the front and rear gears 8 are connected by a shaft 9 being a rotary shaft and a rollers 10 (10a, 10b are attached at a position eccentric from the shaft 9. Fixed gears 13 having square shafts are provided before and behind the housing 3 to be meshed with the gears 8. Graduations matching the position of the rollers 10 corresponding to the outer shape of a round rod 1 to be inspected are provided to a scale plate 16. A weir 17 is formed of an elastomer to come into contact with the round rod 1 to hold an ultrasonic medium. The whole of the apparatus is pressed to the round rod 1 by an actuator and the rollers 10 before and behind the housing 3 necessarily come into contact with the round rod 1 at four points. Therefore, an ultrasonic probe 2 can follow the core shift and vibration of the round rod 1 so as to hold a predetermined interval L.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection device for performing flaw detection inspection using an ultrasonic probe around a tubular or round bar-shaped test material.

[0002]

2. Description of the Related Art A case where a material to be tested is a round bar will be described below. 7 and 8 are views showing a conventional flaw detector, FIG. 7 is a cross-sectional view taken along a plane perpendicular to the axial direction of the round rod 1, and FIG. 8 is taken along a plane parallel to the axial direction of the round rod 1. 3 is a cross-sectional view of each of FIGS. 1A and 1B, showing a state in which the round bar 1 is in contact with a material and a flaw inspection is performed.
7 and 8, 2 is an ultrasonic probe, 3 is a housing into which the ultrasonic probe 2 is inserted, 4 is the housing 3
Attached to the round bar 1, which has the same arc shape as the round bar 1 and abuts on the round bar 1, 5 is a bolt for fixing the above-mentioned shoe 4 to the housing 3, 6 is an ultrasonic probe 2 and the round bar 1 Which is an ultrasonic medium for mechanical contact, and 7 is an inlet for supplying water 6.

The conventional inspection apparatus is constructed as described above,
When the round bar 1 is not present, the inspection device is moved upward and downward by an actuator (not shown in the figure) that raises and lowers the inspection device, and the round bar 1 is conveyed in the axial direction while rotating in the circumferential direction. Then, the flaw detection device is lowered and the flaw detection inspection is started in the state shown in FIG. Since the shoe 4 is pressed by the above-mentioned actuator with a certain force, it is brought into close contact with the round bar 1 and the predetermined gap L is maintained between the ultrasonic probe 2 and the round bar 1 inside the housing 3. Water 6 introduced from the inlet 7
Is full. The ultrasonic wave emitted from the ultrasonic probe 2 in such a state propagates to the round bar 1 through the water 6 to carry out a flaw inspection. Further, it is possible to follow the misalignment and vibration that occur when the round bar 1 is conveyed to some extent.

[0004]

In the conventional device as described above, the gap L required for flaw detection inspection performance is kept constant even if the outer diameter of the rod 1 changes, and the rod 1 and the ultrasonic probe are kept. In order to keep the sound water 6 between the two, and to make the ultrasonic probe follow the misalignment and vibration of the round bar 1, the shoe 4 which was on the outer diameter of the round bar 1 was used. In addition, it is necessary to use a material having abrasion resistance for the shoe. For this reason, since it is necessary to prepare the shoes 4 only for the type of the outer diameter of the round bar 1, running cost will be increased.
Each time the outer diameter of the round bar 1 changes, the mounting bolt 5 must be removed and the shoe 4 must be replaced, which is time-consuming and takes a long time. However, there was a problem that the efficiency of production decreased, which in turn reduced the production efficiency.

Further, since the shoe 4 is in close contact with the round bar 1 and thus has a large friction, it is necessary to increase the pressing force against the round bar 1, and it is necessary to increase the capability of an actuator not shown in the figure. On the contrary, there was a problem that the wear of the shoe 4 was accelerated.

Further, since the outer diameter of the round bar 1 varies within the specified tolerance with respect to the nominal reference outer diameter, even if the shoe 4 having the same diameter as the round bar 1 is used, the round bar 1 is completely adhered. In the case of a round bar 1b larger than the nominal reference outer diameter 1a shown by the imaginary line as shown in FIG. 9, since the shoe 4 is in contact with the round bar 1b at two points on the outer side, the gap L However, in the case of the round bar 1c having a small diameter as shown in FIG. 10, the Shu 4 comes into contact with the round bar 1c at only one point in the central portion, so that the core of the round bar There is a problem in that the ability to follow deviations and vibrations becomes unstable, and the flaw detection performance becomes unstable.

The present invention has been made in order to solve the above problems, and an object thereof is to provide an inspection apparatus in which the size change can be easily set in a short time even when the outer diameter of the round bar 1 changes. Further, it is intended to obtain stable flaw detection performance even if the nominal outer diameter of the round bar 1 varies.

[0008]

In the inspection apparatus according to the present invention, a pair of gears are provided in front of and behind the housing, and a roller is attached at a position eccentric with respect to the shaft of the gear so as to abut the round bar. A scale for locking and aligning the rollers, a fixed gear, and a weir for holding an ultrasonic medium are provided.

Further, in the inspection apparatus according to the present invention, in order to set a constant gap between the ultrasonic probe and the round bar, guide pins are provided at the front and rear of the housing and a tension spring is provided between the pair of gears. is there.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. 1 to 4 are views showing Embodiment 1 of the present invention, FIG. 1 is a view seen from a direction perpendicular to the axial direction of the round bar 1, and FIG. 2 is parallel to the axial direction of the round bar 1. 3 is a view as seen from above in FIG. 3, FIG. 3 is a view as seen from below in the same direction as FIG. 2, and FIG. 4 is a sectional view as seen in the same direction as in FIG. Figure 1
In FIG. 4, reference numerals 1 to 7 represent the same or corresponding parts as those of the conventional device. Reference numeral 8 is a pair of gears attached to the front and rear of the housing 2, 9 is a shaft that connects the front and rear gears 8 and serves as a rotation shaft of the gear 8, and 10 is a shaft 11 at a position eccentric to the rotation shaft of the gear 8. Attached rollers, 12 is a bearing, 13 is a fixed gear having a square shaft attached to the front and rear of the housing and meshing with the gear 8, 14 is a holder having a square hole into which the shaft portion of the fixed gear 13 is inserted, Reference numeral 15 is a compression spring, 16 is a scale plate in which a scale for aligning the position of the roller 10 is engraved according to the outer diameter of the round bar 1 to be inspected, and 17 is for contacting the round bar 1 and holding an ultrasonic medium. It is a cough made of elastic material.

In the inspection apparatus configured as described above, the inspection apparatus is mounted on the front and rear of the housing 2 by being pressed against the round bar 1 by an actuator (not shown) for raising and lowering the inspection apparatus. Since the roller 10 always contacts the round bar 1 at four points, the ultrasonic probe 2 can follow the misalignment and vibration of the round bar 1 when it is conveyed, while keeping the predetermined gap L. it can.

As shown in FIG. 1, a round bar 1d having a small outer diameter.
In the case of, the position of the roller 10 is 10a. However, in the case of the round bar 1e having a large outer diameter as shown by the imaginary line, the roller 10 is kept at a predetermined gap L necessary for flaw detection inspection performance. It is necessary to change the position from 10a to 10b. In the inspection device configured as described above, the shaft portion of the fixed gear 13 that locks the rotation of the gear 8 is pushed in the direction of arrow A to release the meshing with the gear 8, and the gear 8 is rotated in that state. As a result, the roller 10 attached at a position eccentric to the rotation axis of the gear 8 is
And symmetrically in the C direction. Further, since the front and rear gears 8 are connected by the shaft 9 and rotate in synchronization, the four front and rear rollers 10 all fluctuate in the same manner.

Further, the housing 3 is provided with a scale plate 16 having a scale and a size beforehand so that the position of the roller 10 corresponding to the type of the outer diameter of the round bar 1 can be obtained. Therefore, the setting of the position of the roller 10 that matches the outer diameter of the flaw detection inspection is performed by rotating the gear 8 so that the pointer of the gear 8 is aligned with the scale of the outer diameter of the scale plate 16 to be inspected. When the adjustment is complete, fix the fixed gear 13 to the gear 8 again.
The rotation of the gear 8 is locked by meshing with, and the position of the roller 10 attached thereto is also fixed. Thus, the position setting (size matching) of the roller 10 that matches the outer diameter of the round bar 1 to be inspected can be easily performed in a short time.

Further, since the roller 10 always contacts the round bar 1 at four points, even if the diameter varies within the tolerance range of the nominal reference outer diameter, the round bar 1 does not become unstable like the conventional device and does not become unstable.
Can follow the movement of. Although the gap L fluctuates to some extent, it does not hinder the flaw detection inspection as long as the flaw detection performance is within a permissible range. Further, since the roller 10 is in contact with the round bar 1 and the roller 10 is rotated along with the rotation of the round bar 1 in the circumferential direction, much more friction is generated as compared with the conventional device in which the shoe 4 and the round bar 1 are in full contact. It is small and the cost of the device can be reduced because the ability of the actuator to press the inspection device against the round bar 1 can be reduced, and the production of the shoe 4 that matches the diameter of the round bar 1 which was required in the past is no longer necessary, resulting in a significant running cost. Go down to.

Embodiment 2 5 and 6 are views showing Embodiment 2 of the present invention, FIG. 5 is a view seen from a direction perpendicular to the axial direction of the round bar 1, and FIG. 6 is parallel to the axial direction of the round bar 1. It is the figure seen from the lower part of the normal direction. 5 and 6,
Reference numeral 18 denotes a guide pin that is driven into the front-rear center of the housing 2. By contacting the spherical tip with the round bar 1, a predetermined gap is formed between the round bar 1 and the ultrasonic probe 2. L is provided. Reference numeral 19 is a tension spring stretched between a pair of gears 8, 20 is a stopper pin for limiting the rotation range of the gear 8 fixed to the housing 2,
Reference numeral 21 is a groove provided in the gear 8. Other configurations are the same as those in FIGS.

In the second embodiment shown in FIGS. 5 and 6,
When the inspection device is in the standby state above the round bar 1, the roller 10 is moved to the innermost position 1 by the force of the tension spring 19.
0c. When the flaw detection inspection is started and the inspection apparatus is lowered onto the round bar 1 by an actuator (which has a force stronger than the reaction force of the tension spring 19) not shown in the figure, the left and right rollers 10 move to the round bar 1. The tension spring 19 is in a stretched state as it is pushed up to the left and right and is symmetrically changed. When the tip of the guide pin 18 comes into contact with the round bar 1 in due time, the roller 10 comes into contact with the round bar 1 by the pressing force against the round bar 1 generated by the force of the tension spring 19.
Stop at d.

In the inspection apparatus configured as described above, since the guide pin 18 directly contacts the round bar 1, a constant gap is always maintained between the ultrasonic probe 2 and the round bar 1. Therefore, the fluctuation of the gap caused by the variation of the nominal reference outer diameter within the tolerance range in the conventional device is eliminated, and stable and high-performance flaw detection performance can be obtained. Moreover, since the four rollers 10 in total are pressed against the round bar 1, it is possible to follow the deviation and vibration during the transportation of the round bar 1.

As described above, for any outer diameter of the round bar 1, a predetermined gap and follow-up performance can be obtained only by the raising / lowering movement of the inspection device by the actuator, and the conventionally required size adjustment is not required, and the time is greatly reduced. Can be achieved.

[0019]

According to the present invention, since the position of the roller attached to the gear changes symmetrically when the gear is turned in accordance with the scale, size adjustment with respect to the outer diameter of the material to be inspected can be easily performed in a short time. You can Further, since the contact with the material to be inspected is four-point contact with the rollers, the follow-up performance is improved, and since the friction is small, the ability of the actuator to press it against the inspection device can be reduced, so that the device can be made inexpensive and at the same time required conventionally. Since it is not necessary to manufacture a shoe that matches the diameter of the material to be tested, there is an effect that running costs can be significantly reduced.

According to the present invention, when the flaw detection performance is required to be high, the gap between the ultrasonic probe and the test material is kept constant by the guide pin at the center contacting the test material. Therefore, even if the nominal reference outer diameter of the test material varies, stable and high-performance flaw detection performance can be obtained. Also, the roller is opened symmetrically by lowering the inspection device with the actuator, and the position of the roller is set when the guide pin driven into the center of the housing comes into contact with the material to be inspected. Since it is pressed against, it is possible to follow the movement of the material to be inspected, and there is an effect that the size adjustment which is conventionally required every time the diameter of the material to be inspected is not necessary and the time can be greatly shortened.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of an inspection device according to the present invention.

FIG. 2 is a diagram showing Embodiment 1 of the inspection apparatus according to the present invention.

FIG. 3 is a diagram showing Embodiment 1 of the inspection device according to the present invention.

FIG. 4 is a diagram showing Embodiment 1 of the inspection apparatus according to the present invention.

FIG. 5 is a diagram showing a second embodiment of the inspection device according to the present invention.

FIG. 6 is a diagram showing a second embodiment of the inspection device according to the present invention.

FIG. 7 is a diagram showing a conventional inspection device.

FIG. 8 is a diagram showing a conventional inspection device.

FIG. 9 is a diagram showing a conventional inspection device.

FIG. 10 is a diagram showing a conventional inspection device.

[Explanation of symbols]

1 test material, 2 ultrasonic probe, 3 housing, 8
Gears, 9 shafts, 10 rollers, 13 fixed gears, 17 weirs, 18 guide pins, 19 tension springs.

Claims (2)

[Claims] 1. An inspection apparatus for inspecting a tubular or round bar-shaped material to be inspected, a housing in which an ultrasonic probe is mounted, and a pair provided in front of and behind the housing so as to move in synchronism with each other via a shaft. , A roller that is mounted on this gear at a position eccentric to the gear shaft, moves symmetrically according to the change in the outer diameter of the material to be tested, and contacts the material to be tested; Fixed gears,
An inspection apparatus, comprising: a scale plate attached to the housing and having a scale indicating the position of the roller according to the outer diameter of the material to be tested. 2. A pulling spring stretched between a pair of gears, and guide pins driven in front and rear of the housing for holding a gap between the test material and the ultrasonic probe. The inspection device described.