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DESCRIPTION JP2005300286

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DESCRIPTION JP2005300286
An object of the present invention is to accurately measure the thickness of an object such as a
steel plate having an uneven surface formed by adhesion of rust, a coating film or the like on the
surface. SOLUTION: A holder 9 in which a transmitting / receiving element 8 is mounted and a
liquid having a high ultrasonic conductivity is sealed in a space between the transmitting /
receiving element 8 and a tip end, and the holder 9 is fixed. A slider 3 having a swing jig 5 from
which 4 protrudes and an arm portion 3a on which the swing fixed shaft 4 is rotatably mounted,
the slider 3 supporting the swing jig 5 in a tiltable manner, and A vertical fixing jig 1 for
supporting the slider 3 vertically movably and downward by means of the vertical slide
mechanism 2, and interposed between the swing jig 5 and the arm portion 3a. The ultrasonic
probe 20 including the elastic body 7 for returning the holder 9 to the neutral position and the
ultrasonic flaw detector 30 are electrically connected via a cable, and the intensity of the
ultrasonic wave received by the transmitting / receiving element and Ultra sound with display
function to display a graph showing the relationship with time In the measuring device,
characterized in that the switch 6 for fixing the graph displayed by the display function provided
in the ultrasound probe 20. [Selected figure] Figure 1
Ultrasonic probe and ultrasonic measuring instrument
[0001]
The present invention relates to an ultrasonic probe and an ultrasonic measuring instrument, and
in particular, to accurately measure the thickness of an object such as a steel plate having an
uneven surface formed by adhesion of rust, a coating film or the like on the surface. It is an
improvement so that it can be measured.
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[0002]
A steel plate is surface-coated and used.
The surface coating layer is corroded to corrode the steel plate portion. The degree of such
corrosion can be known by measuring the overall thickness. The measuring device which
measures thickness in that way is shown in FIG. 5 (patent document 1). As shown in FIG. 5, the
lower end of the ultrasonic probe 110 is in contact with the surface of the steel plate 121.
[0003]
The ultrasonic probe 110 has a cylindrical transmitting and receiving element 105 fitted to the
upper end of the cylindrical holder 102, and a liquid (water) 106 having high ultrasonic
conductivity in the conical space of the cylindrical holder 102. Is sealed and the lower end
portion is sealed with a sealing film 113. The steel plate 121 includes a steel plate main body
122 and coating films 123 and 123 applied to both upper and lower surfaces of the steel plate
main body 122. In the steel plate 121, the upper surface side coating film is corroded, and the
upper surface side of the steel plate main body 122 is partially corroded in a concave shape,
rusting occurs in the corroded portion, and a rust layer 124 is formed.
[0004]
The ultrasonic pulses emitted from the transmitting and receiving element 105 are concentrated
in a point-like region near the surface of the steel plate 121. The ultrasonic waves concentrated
in the vicinity of the surface of the steel plate 121 pass through the rust layer 124 and are
reflected on the bottom surface of the interface steel plate body between the steel plate body
122 and the lower paint film 123 as shown by the solid line in FIG. , Propagates through the steel
plate main body 122, and further passes through the rust layer 124 and bounces back as an
echo B1 incident on the receiving surface.
[0005]
Further, it passes through the rust layer 124, is reflected at the interface between the steel plate
body 122 and the lower coating film 123, propagates through the steel plate body 122, and is
further reflected by the bottom surface of the rust layer 124. As shown by the broken line 5, it
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propagates through the steel plate body 122 three times, reflects again on the bottom surface of
the steel plate body 122, propagates through the steel plate body 122 four times, and transmits
through the rust layer 124 It bounces back as an echo B2 incident on the surface.
[0006]
If the time for echo B1 to pass through the steel plate body is represented by t, the time for echo
B2 to pass through the steel plate body is 2t with good accuracy.
The difference between the time for the echo B1 to propagate in the steel sheet body and the
time for the echo B2 to propagate in the steel sheet body is t. If t is known and the propagation
velocity of the ultrasonic wave in the steel plate main body is v, the thickness of the steel plate
main body 122 of the corroded portion is vt. The measurement results of the echoes B1 and B2
are shown in FIG. In the spectrum shown in FIG. 6, the horizontal axis represents the propagation
time of the ultrasonic pulse (or the converted distance converted to the distance), and the vertical
axis represents the intensity of the received ultrasonic wave. The intensity is linear or
logarithmic. Patent document 1: JP-A-2001-309475
[0007]
If the ultrasonic probe 110 can be brought into vertical contact with the surface of the steel plate
121, the surface reflection pulse that reciprocates between the transmitting and receiving
element 105 and the uneven surface of the object to be measured becomes constant, enabling
high precision measurement. It becomes. However, when measuring the uneven portion on the
surface of the steel plate 121, there is a problem that the ultrasonic probe 110 does not stabilize
vertically to the uneven portion, so that the measured waveform becomes unstable and it takes
time for measurement. The That is, when the ultrasonic probe 110 is inclined with respect to the
surface of the steel plate 121, it causes an error.
[0008]
An ultrasonic probe according to a first aspect of the present invention for achieving such an
object is characterized in that a holder on which a transmitting and receiving element is mounted
is supported so as to be tiltable.
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[0009]
An ultrasonic probe according to claim 2 of the present invention for achieving the above object
is characterized in that, in claim 1, it has a function of automatically returning the holder to a
neutral position.
[0010]
An ultrasonic probe according to a third aspect of the present invention for achieving the above
object is characterized in that in the first or second aspect, the holder is tiltably supported in at
least two directions.
[0011]
An ultrasonic probe according to a fourth aspect of the present invention for achieving the above
object is characterized in that in the first, second or third aspect, the holder is supported so as to
be vertically movable and biased downward. .
[0012]
An ultrasonic probe according to a fifth aspect of the present invention for achieving the above
object comprises: a holder in which a transmitting and receiving element is mounted and a liquid
having a high ultrasonic conductivity is sealed in a space between the transmitting and receiving
element and the tip It has a swing jig with a holder fixed and a swing fixed shaft projected on
both sides, and an arm part to which the swing fixed shaft is rotatably mounted, and supports the
swing jig so that it can tilt. And a vertical fixing jig for supporting the slider vertically and
movably downward via an up and down slide mechanism, and interposed between the swing jig
and the arm portion, And an elastic body for returning the holder to a neutral position.
[0013]
An ultrasonic measuring instrument according to claim 6 of the present invention for achieving
the above object is an ultrasonic measuring instrument using an ultrasonic probe according to
claim 1, 2, 3, 4 or 5, In an ultrasonic measuring instrument having a display function for
displaying a graph showing the relationship between the intensity of ultrasonic waves received
by the element and time, the ultrasonic probe is a switch for fixing a graph displayed by the
display function. It is characterized by being provided to a child.
[0014]
In the ultrasonic probe according to claim 1 of the present invention, since the holder on which
the transmission / reception element is mounted is tiltably supported, if the holder is brought
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into contact with an uneven measuring object such as a steel plate having corrosion, the holder
Since the fine movement is always made perpendicular to the unevenness, the thickness of the
object to be measured can be measured with high reliability.
[0015]
The ultrasonic probe according to claim 2 of the present invention has a function of
automatically returning the holder to the neutral position, so when the holder is released from
the object to be measured, the holder is automatically moved from the tilted position to the
neutral position You can return to
[0016]
In the ultrasonic probe according to claim 3 of the present invention, since the holder on which
the transmitting / receiving element is mounted can be tilted in at least two directions, it can be
tilted in any direction, and any unevenness can be obtained. Since the holder finely moves so as
to be always vertical, the thickness of the object to be measured can be measured with high
reliability.
[0017]
In the ultrasonic probe according to the fourth aspect of the present invention, the holder on
which the transmitting and receiving element is mounted is moved up and down to be biased by
the measurement object having the unevenness, so that stable contact can be maintained.
[0018]
In the ultrasonic probe according to claim 5 of the present invention, the slider is urged against
the vertical fixing jig when the holder on which the transmission / reception element is mounted
is brought into contact with the measurement object having the unevenness. The holder is moved
up and down to maintain stable contact, and the swing jig fixing this holder is tilted with respect
to the slider to finely move the holder so that it is always perpendicular to the asperities, and
then When the holder is separated from the object to be measured, it is always restored to the
neutral position by the elastic body interposed between the swing jig and the arm portion of the
slider.
[0019]
In the ultrasonic measuring instrument according to claim 6 of the present invention, while the
operator operates the ultrasonic probe with one hand, the transmitting and receiving element is
easily received by operating the switch provided on the ultrasonic probe. It is possible to fix a
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graph showing the relationship between the intensity of ultrasonic waves and time, and it is
possible to supplement a good waveform.
[0020]
The best mode for carrying out the present invention is Example 1 and Example 2 shown below.
[0021]
An ultrasonic probe according to a first embodiment of the present invention is shown in FIGS.
FIGS. 1A, 1B, and 1C are a plan view, a front view, and a side view of an ultrasonic probe
according to a first embodiment of the present invention.
2 (a) (b) (c) are cross-sectional views taken along line A-A, B-B and C-C in FIG. 1 (a).
FIGS. 3 (a) and 3 (b) are cross-sectional views taken along the lines D-D and E-E in FIG. 2 (a).
[0022]
As shown in FIGS. 1 to 3, the slider 3 is supported by the sensor vertical fixing jig 1 so as to be
vertically movable via the vertical slide mechanism 2, and the slider 3 is biased downward by the
vertical slide mechanism 2. Has built-in structure.
The sensor vertical fixing jig 1 is a portion gripped by an operator with one hand, and for
example, a hand switch 6 may be provided as in the second embodiment shown in FIG.
The sensor vertical fixing jig 1 and the slider 3 are provided with slide stop structures 1a and 3c,
respectively, and are engaged with each other to limit the vertical movement of the vertical slide
mechanism 2.
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[0023]
Two arms 3a are provided horizontally on the slider 3, and the swing fixing jig 5 is supported by
these arms 3a via a swing fixing shaft 4 so as to be able to tilt back and forth (about ± 5
degrees) .
That is, swinging fixed shafts 4 project to the left and right both sides of the swinging fixing jig 5,
and these swinging fixed shafts 4 are tiltably supported by penetrating the arm portion 3 a, and
both sides of the swinging fixed shaft 4 are Spring fixing portions 3b are respectively provided
on the arm portions 3a in the above, and two spring fixing portions 5a are respectively provided
on the left and right sides of the swing fixing jig 5 Four springs 7 (elastic bodies) are interposed.
These springs 7 have the same degree of elasticity, and mutually press the swing fixing jig 5
downward in the vertical direction (neutral position).
[0024]
Therefore, although the swinging and fixing jig 5 can be tilted back and forth centering on the
swinging and fixing shaft 4, the function of returning vertically downward is exhibited even if it
is tilted in any direction.
A holder 9 to which the transmitting and receiving element 8 is attached is vertically penetrated
and held by the swinging and fixing jig 5 and fixed by a holder fixing screw 11.
The holder 9 has a cylindrical shape, and a columnar transmitting / receiving element 8 is
watertightly fitted to the upper end thereof via an O-ring 10 and fixed by a fixing screw 12.
[0025]
The lower portion of the holder 9 is a conical chamber filled with a liquid (water) having high
ultrasonic conductivity, and is sealed by a water injection port closing screw 9a and a seal film
13 at the tip.
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Therefore, the ultrasonic wave transmitted from the transmitting and receiving element 8 passes
through the inside of the chamber and is reflected by the object to be measured, and the
returned ultrasonic wave passes through the inside of the chamber and is received by the
transmitting and receiving element 8 .
[0026]
According to the ultrasonic probe of the present embodiment having the above configuration,
when the holder 9 is pressed against the surface of the object to be measured, the transmitting /
receiving element 8, the holder 9, the swing jig 5 and the slider 3 are While being vertically
moved against the vertical fixing jig 1 while being urged downward by the upper and lower slide
mechanism 2, the transmitting / receiving element 8, the holder 9 and the swinging jig 5
centering on the swing fixed shaft 4. By tilting back and forth, it is finely moved so as to always
be perpendicular to the surface asperities.
Therefore, the surface reflection pulse that reciprocates between the transmitting and receiving
element 8 and the uneven surface of the object to be measured becomes constant, and highaccuracy measurement becomes possible.
In addition, since the measured waveform becomes stable, there is no error factor, and it is
possible to perform measurement in a short time.
[0027]
In the above embodiment, the swinging jig 5 tilts in one direction, but the invention is not limited
to this, and tilting in two or more directions makes it possible to tilt in any direction. Since the
swing jig 5 finely moves so as to always be perpendicular to such irregularities, it is possible to
reliably measure the thickness of the object to be measured.
Further, the range of tilting of the swinging jig 5 is not limited to ± 5 degrees, and may be
further largely tilted according to the size of the unevenness.
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[0028]
An ultrasonic measurement instrument according to a second embodiment of the present
invention is shown in FIG. FIG. 4 is a schematic view of an ultrasonic measurement device
according to a second embodiment of the present invention. In the present embodiment, the
ultrasonic probe 20 and the ultrasonic flaw detector 30 according to the first embodiment
described above are electrically connected by a cable.
[0029]
In the ultrasonic flaw detector 30, the horizontal axis represents the propagation time of the
ultrasonic pulse (or the converted distance converted to the distance), and the vertical axis
represents the received ultrasonic wave. And a display function to display a graph as an intensity
(linear or logarithmic value) of As described in the prior art, this display function displays, for
example, the spectrum shown in FIG. 6 when displaying the echoes B1 and B2 transmitted
through and reflected by the steel plate. Includes features to set.
[0030]
The B1 and B2 gates mean a gate having a fixed time width on the horizontal axis, and the peaks
included in the time width of this gate are detected as echoes B1 and B2. The peaks need not
exceed the B1 and B2 gates, and the heights of the B1 and B2 gates have no meaning. Here, since
the positions of the horizontal axes to be detected as echoes B1 and B2 change according to the
thickness of the steel plate, the B1 and B2 gates are moved along the horizontal axes, and the
time widths of the B1 and B2 gates are also It can be changed.
[0031]
Furthermore, as shown in FIG. 6, although the measurement result flows in real time (shown by a
broken line), it also has a function of fixing the waveform. The term "fixed" as used herein means
that the measurement result is left so as not to disappear on the screen. Then, when the fixed
waveform is the maximum of the peak value among the measurement results flowing in real time
(indicated by the solid line), it is most suitable as the echoes B1 and B2 and captures a good
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waveform with few errors. It will be.
[0032]
However, as described above, when the ultrasonic flaw detector 30 is provided with a switch for
fixing the waveform, the ultrasonic flaw detector 30 looks at the flaw detection waveform while
operating the ultrasonic probe 20 with one hand. The switch for fixing the waveform had to be
operated, and in one-person operation, it was easy to cause hand movement during measurement
or to make measurement error.
[0033]
Therefore, in the present embodiment, the ultrasonic probe 20 is provided with the switch 6 for
fixing the waveform in the display function.
As a result, in the present embodiment, the switch 6 can be easily operated while operating the
ultrasonic probe 20 with one hand, so that camera shake does not occur even in the
measurement of one person's work, and accurate measurement can be performed. There is an
advantage that is possible.
[0034]
The present invention relates to an ultrasonic probe and an ultrasonic measuring instrument, and
in particular, to accurately measure the thickness of an object such as a steel plate having an
uneven surface formed by adhesion of rust, a coating film or the like on the surface. It can be
widely used in the field of measurement.
[0035]
FIGS. 1A, 1B, and 1C are a plan view, a front view, and a side view of an ultrasonic probe
according to a first embodiment of the present invention.
2 (a) (b) (c) are cross-sectional views taken along line A-A, B-B and C-C in FIG. 1 (a). FIGS. 3 (a)
and 3 (b) are cross-sectional views taken along the lines D-D and E-E in FIG. 2 (a). FIG. 4 is a
schematic view of an ultrasonic measurement device according to a second embodiment of the
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present invention. It is the schematic of the measuring device which measures the thickness
which concerns on a prior art. It is a graph which shows the measurement result of echo B1, B2.
Explanation of sign
[0036]
Reference Signs List 1 sensor vertical fixing jig 2 vertical slide mechanism 3 slider 4 swinging
fixed shaft 5 swinging fixing jig 6 hand switch 7 spring 8 transmitting / receiving element 9
holder 10 O ring 11 holder fixing screw 20 ultrasonic probe 30 ultrasonic flaw detector vessel
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