JPH063333A - Continuous ultrasonic measuring instrument - Google Patents

Abstract

PURPOSE:To prevent a running band-shaped plate from being scratched and, at the same time, to eliminate the influence of disturbance caused by the vibration of the plate by providing caster pairs very closely to the sides of non- contact sensors which scan the plate while the sensors move on the plate forward and backward along the width direction of the plate. CONSTITUTION:Caster pairs 12a-12e and 12a'-12e' are respectively arranged so that they can surround liquid-column ultrasonic sensors 10a-10d and 10a'-10d' and hold a silicon steel plate 14 in between. Therefore, the vibration of the steel plate 14 is suppressed near the sensors and the plate 14 can be stably maintained at a fixed level. Ultrasonic waves 20 transmitted from an ultrasonic wave generator 16a are passed through the steel plate 14 and the damped waves are finally received by an ultrasonic wave receiver 18a which converts the waves into electric signals. Since the electric signals, namely, the output signal of the receiver 18a is made to correspond to the crystal orientation of the steel plate 14, the crystal orientation of the steel plate 14 can be found when the electric signals are processed at a signal processing section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring and inspecting a strip-shaped plate by arranging liquid column-shaped ultrasonic sensors on both sides of the strip-shaped plate to face each other. The present invention relates to a continuous ultrasonic measuring device capable of measuring and detecting flaws on a strip without causing characteristic deterioration and surface defects, and without being affected by disturbance caused by vibration of the strip.

[0002]

2. Description of the Related Art As is well known, ultrasonic sensors are widely used for quality evaluation of metallic materials, etc., but maintaining stable acoustic coupling between the ultrasonic sensor and the material to be inspected is always a major issue. Has become.

Particularly in continuous measurement of a strip running at a high speed, the supply of acoustic coupling fluid, the inclination of the surface of the material to be inspected,
Variations in the distance to the ultrasonic sensor directly affect the measurement result. Such an effect is particularly remarkable when a strip plate traveling at high speed is measured by utilizing resonance or interference of ultrasonic waves.

For example, as disclosed in Japanese Patent Application Laid-Open No. 1-229962, it has been conventionally practiced to measure the crystal orientation of a silicon steel sheet by using the multiple reflection interference intensity of ultrasonic waves.

However, when the crystal orientation of a silicon steel sheet is measured by using the multiple reflection interference intensity of ultrasonic waves, the silicon steel sheet as the object to be measured vibrates or causes a defective shape, so that the measurement position fluctuates. There is a problem that a tilt of the measurement surface occurs and ultimately causes a large detection error.

For this reason, it has been common practice to install pinch rollers in front of and behind the measuring device to suppress the vibration of the silicon steel sheet to prevent the measurement position from fluctuating.
Further, for example, as disclosed in Japanese Patent Laid-Open No. 51-29187, the tension of the silicon steel plate is increased to suppress the vibration of the silicon steel plate.

[0007]

However, in the above-mentioned conventional example, although the vibration of the strip plate can be suppressed just below the pinch roller, there is a distance from the pinch roller to the measurement position. There was a problem that vibration was generated again.

Further, in the pinch roller, the bearing and the supporting structure take up space, and if the radius of curvature of the pinch roller is made small, the restraint of the strip plate becomes unstable. Therefore, the strip plate is restrained near the ultrasonic sensor. However, it was difficult to prevent fluctuations in the measurement position of the strip plate.

In particular, it is not possible to prevent fluctuations in the measurement position of the strip-shaped plate that is the object to be measured, and if the strip-shaped plate is in a partially stretched state, the pinch rollers installed before and after the ultrasonic sensor cannot handle it. There was also a problem.

Further, in the case of a silicon steel plate, there is a restriction that if the tension of the silicon steel plate is increased to suppress the vibration of the plate, the magnetic property is significantly deteriorated.

In view of the above situation, the present invention has been made to solve the above-mentioned problems of the conventional example, and does not cause characteristic deterioration or surface flaws on the running strip plate, and the strip form is not caused. An object of the present invention is to provide a continuous ultrasonic measuring device capable of measuring and detecting flaws on a strip plate without being affected by a disturbance caused by vibration of the plate.

[0012]

According to the present invention, liquid column-shaped ultrasonic sensors are arranged to face each other on both front and back surfaces of a running strip.
In a continuous ultrasonic measuring device for measuring and detecting flaws on the strip, a non-contact sensor that reciprocally scans in the width direction of the strip and a plurality of caster pairs arranged laterally near the non-contact sensor are provided. The above problem is solved by sandwiching the strip-shaped plate between these caster pairs.

[0013]

In general, it is noted that the vibration suppression of the strip plate can be achieved by sandwiching the strip plate from both sides. Uses multiple pairs of casters to reduce plate vibration.

That is, a plurality of liquid column type ultrasonic sensors as non-contact type sensors, which are arranged opposite to each other on the front and back sides of the running strip, are brought close to each other within a range that does not adversely affect acoustic coupling of the sensors. A plurality of caster pairs are arranged, and the strip-shaped plate is sandwiched from both front and back sides and held at a predetermined position to suppress the vibration of the strip-shaped plate.

In the case of the conventional pinch roller, the area of the non-touched portion of the pinch roller is large, and vibration is generated in this portion, whereas in the present invention in which a plurality of caster pairs are arranged, With these caster pairs, vibration can be suppressed on almost the entire surface of the strip plate.

Therefore, the liquid column as a non-contact type sensor does not cause characteristic deterioration or surface flaws on the running strip plate, and is not affected by the disturbance due to the vibration of the strip plate as the object to be measured. With the ultrasonic ultrasonic sensor, the measurement and flaw detection of the strip plate can be performed accurately and highly accurately.

In particular, the pair of casters sandwiches the strip-shaped plate from both front and back sides, and each pair of casters can be swiveled around a swivel axis perpendicular to the plate surface of the strip-shaped plate. When the sensor is fixed and reciprocally scanned integrally with the non-contact sensor, more stable measurement can be performed.

[0018]

EXAMPLES Examples of the present invention will be described in detail below with reference to the drawings while exemplifying a case of measuring the crystal orientation of a silicon steel sheet by using multiple reflection of ultrasonic waves.

FIG. 1 is a plan view schematically showing the layout of this embodiment, and FIG. 2 is a sectional view taken along the line II--II of FIG.

In these figures, 10a to 10d, 1
0a to 10d 'are liquid column type ultrasonic sensors as non-contact type sensors, 12a to 12e, 12a' to 12e 'are caster pairs, and 14 is an object to be measured running in the direction of the thick arrow in FIG. The silicon steel plates 16a and 18a constitute a part of the liquid column type ultrasonic sensors 10a and 10b, respectively, and are ultrasonically coupled to each other by an ultrasonic transmitter and an ultrasonic receiver, 20a.
Is an ultrasonic wave transmitted from the ultrasonic transmitter 16a, transmitted through the silicon steel plate 14, and finally received by the ultrasonic receiver 18a.

The ultrasonic sensors 10b to 10d shown in FIG.
As for the ultrasonic sensors 10a and 10a ', 10b' to 10d 'also have ultrasonic transmitters (18b to 18d) and ultrasonic receivers (18b) which are acoustically coupled to each other.
b'-18d ').

In the present embodiment having the structure as shown in FIGS. 1 and 2, the caster pairs 12a-12e, 12a'-1.
2e 'are ultrasonic sensors 10a to 10d, 10 respectively.
A large number of a'to 10d 'are arranged to sandwich the silicon steel plate 14 between these caster pairs. Therefore, the ultrasonic sensors 10a-10d, 10a'-10
Vibration of the silicon steel plate 14 is suppressed in the vicinity of d ', and the silicon steel plate 14 can maintain a stable and constant level.

Further, in FIG. 2, the ultrasonic transmitter 16a
The ultrasonic wave 20a transmitted from the ultrasonic wave 20a is transmitted through the silicon steel plate 14 and attenuated, and finally received by the ultrasonic wave receiver 18a and converted into an electric signal. This electric signal, that is, the output signal of the ultrasonic receiver 18a corresponds to the crystal orientation of the silicon steel plate 14, and the crystal orientation of the silicon steel plate 14 is obtained by processing the electric signal by a signal processing unit (not shown). Is required.

In this case, the ultrasonic sensors 10a to 10d,
In the vicinity of 10a 'to 10d', as described above, the silicon steel plate 1
Since the vibration of No. 4 is suppressed, the measurement position fluctuation of the silicon steel plate 14 is avoided, the characteristic deterioration and the surface flaw are not generated in the silicon steel plate 14, and the influence of the disturbance due to the vibration of the silicon steel plate 14 is not generated. The crystal orientation of the silicon steel plate 14 can be obtained.

FIG. 3 is an enlarged plan view showing a peripheral portion of the caster pair 12b of FIG. 1, and FIG. 4 is a sectional view taken along line IV-IV of FIG. In FIGS. 3 and 4, the same symbols as those in FIGS. 1 and 2 are used with the same meanings, and duplicate explanations are omitted here. Further, 22b and 22b 'are caster pairs 1 provided so as to be perpendicular to the silicon steel plate 14, respectively.
It is a pivot for 2b and 12b '.

In FIGS. 3 and 4, the caster pair 12
b is rotatable about a swivel axis 22b, and the swivel axis is fixed to a mount (not shown) of the liquid column type ultrasonic sensor 10b which is a non-contact sensor so as to be integrated with the sensor 10b. Scan back and forth. Similarly, the pair of casters 12b 'can be swiveled around a swivel axis 22b', which is fixed to a mount (not shown) of the liquid column type ultrasonic sensor 10b 'which is a non-contact sensor. Reciprocal scanning is performed integrally with the sensor 10b '. Further, the caster pairs 12b and 12b 'can rotate 360 ° about the swivel shafts 22b and 22b', respectively, so that the vibration of the running silicon steel plate 14 can be effectively suppressed.

This is because the other caster pairs 12a, 12c-12e, 12a ', 12c'-12e in FIG.
The same applies to ′, and these caster pairs 12a
To 12e, 12a 'to 12e' sandwich the silicon steel plate 14 to suppress the vibration of the silicon steel plate 14 and stabilize the pass line, and the liquid column type ultrasonic sensor 1 which is a non-contact sensor.
The fluctuation of the water distance of 0a to 10d, 10a 'to 10d' is suppressed to secure the detection sensitivity of the sensor.

The present invention is not limited to the above-described embodiment, but various modifications can be made. For example, the caster pair 1
Instead of 2a to 12e and 12a 'to 12e', roller-shaped rollers or the like may be used. Further, instead of the silicon steel plate 14, it may be used for measuring other steel plates or general strip-shaped plates.

[0029]

As described in detail above, according to the present invention, a plurality of casters are arranged in the immediate vicinity of the non-contact sensors which are arranged opposite to each other on the front and back surfaces of the traveling strip plate, and the caster pair is used. By sandwiching the strip plate, vibration of the strip plate is suppressed and the pass line is stabilized. Therefore, it is possible to secure the detection sensitivity of the liquid column type ultrasonic sensor, which is a non-contact sensor, by suppressing the fluctuation of the water distance even in the case of a low tension passing plate or a strip plate having poor flatness. it can.

In particular, even when the running strip to be measured is partially stretched in the width of the strip, that is, even if the strip to be measured is not flat, Since the strips are sandwiched by the casters that are placed in the immediate vicinity of the non-contact sensor, the strips are temporarily flattened and constrained just below the non-contact sensor. It is possible to perform accurate and high-precision measurement and flaw detection of the strip plate without being affected by.

Further, the caster pair is 3 centered around the turning axis.
Since it can rotate by 60 °, it is possible to effectively suppress the vibration of the traveling strip, and as a result, the traveling strip, which is the object to be measured, does not suffer from characteristic deterioration or surface flaws, and the strip does not become damaged. It is possible to perform accurate and high-precision measurement and flaw detection of the strip plate without being affected by the disturbance due to the vibration.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing the layout of this embodiment.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an enlarged plan view showing the caster pair peripheral portion of FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV in FIG.

[Explanation of symbols]

 10a to 10d, 10a 'to 10d' ... Ultrasonic sensors 12a to 12e, 12a 'to 12e' ... Castor pair 14 ... Steel plate 16a ... Ultrasonic transmitter 18a ... Ultrasonic receiver 20a ... Ultrasonic waves 22b, 22b '... Turning axis

Claims (2)

[Claims] 1. An apparatus for measuring and detecting flaws on a strip-shaped plate by disposing liquid column-shaped ultrasonic sensors on both sides of a strip-shaped plate which is running, and a non-contact sensor that reciprocally scans in the width direction of the strip-shaped plate. A continuous ultrasonic measuring device comprising: a plurality of caster pairs arranged in the immediate vicinity of the non-contact sensor, and sandwiching the strip plate with the caster pairs. 2. The caster pair according to claim 1, wherein the pair of casters holds the strip plate from both front and back surfaces and is rotatable about a swivel axis perpendicular to a plate surface of the strip plate, the swivel axis being non-rotating. A continuous ultrasonic measuring device, characterized in that it is fixed to a pedestal of a contact sensor and configured to reciprocally scan integrally with the non-contact sensor.