JP4353604B2 - Local water immersion jig for ultrasonic probe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a local water immersion ultrasonic flaw detector, and when automatically scanning the outer surface of a material to be inspected by a local water immersion ultrasonic probe, the bottom surface of the probe and the outside of the material to be inspected. The required amount of contact medium (water) can be smoothly and sufficiently supplied to the gap with the surface, and even in the case of a material to be inspected with many irregularities on the outer surface, or a large probe with a large bottom area The present invention relates to a local water immersion jig for an ultrasonic probe capable of continuously detecting flaws with higher accuracy even when used.
[0002]
[Prior art]
Ultrasonic flaw detection by a local water immersion method is widely used as a method for inspecting the presence or absence of internal defects in steel materials having a thickness of 13 mm or more, and specifically, is specified in detail in JIS G0801-1974, JISZ 2344-1973, etc. .
[0003]
FIG. 3 shows an example of a local water immersion type ultrasonic probe used in the above-mentioned local water immersion type ultrasonic flaw detection. In the figure, 1 is a probe, 2 is a probe housing, and 7 is a probe housing. 8 is a water supply pipe, 9 is a material to be inspected, 12 is a water supply groove, 13 is a water film, 14 is a probe holder, 15 is a lead wire, 16 is an XY scanner, and 17 is a Z scanner. .
[0004]
A water supply groove 12 having a substantially square cross section is formed in a loop shape on the lower end surface 2b of the probe housing 2 for storing the probe, and the contact medium supplied through the water supply pipe 8 and the supply passage 2a. Is supplied to the gap between the outer surface 9a of the material 9 to be inspected and the bottom surface 1a of the probe, whereby the water film 13 having an appropriate thickness is formed.
[0005]
The thickness L of the water film 13 is usually set to a thickness of 3 to 15 mm according to the shape and dimensions of the probe bottom surface 1a, the scanning speed, the state of the outer surface 9a to be inspected, and the like. The supply pressure and supply flow rate of the water W are controlled so that the L water film 13 is formed, and usually 0.5 to 1.0 L / min of water W is supplied.
[0006]
In FIG. 3, the water supply groove 12 is formed in a loop shape on the lower end surface 2b of the probe housing 2 for storing the probe 1, but as shown in FIG. A water supply groove 12 is provided in a loop shape on the lower end surface 3b of the separately formed cylindrical frame 3, and the local water having a configuration in which the frame 3 is fixed to the outer surface of the lower end of the probe housing 2. Immersion ultrasonic probes have also been widely used. This is because it is easier to process the water supply groove 12 when the frame 3 is separate.
[0007]
By the way, in the local water immersion type ultrasonic flaw detection in which flaw detection is performed while water is poured from the water supply groove 12, (1) ultrasonic waves from the probe bottom surface 1a to the outer surface 9a to be inspected during measurement. The propagation range is completely filled with water W as a propagation medium, (2) the distance L between the probe bottom surface 1a and the outer surface 9a to be inspected is constant, and (3) the contact medium The absence of foreign substances such as bubbles in a certain water W or on the outer surface 9a of the material 9 to be inspected is an indispensable requirement for improving flaw detection accuracy. If these requirements are not satisfied, the ultrasonic echo is not transmitted to the material 9 to be inspected, and is returned as a reflected echo on the way, or information on the position to be measured cannot be obtained.
[0008]
Therefore, the flow rate of the water W to be supplied and the gap L between the probe bottom surface 1a and the outer surface 9a to be inspected need to be particularly strictly controlled during the measurement, and the parallelism between the outer surface 9a to be inspected and the XY scanner is parallel. If the smoothness of the outer surface 9a of the material to be inspected can be increased and the gap L can be accurately managed, the local water immersion ultrasonic flaw detection has excellent practical utility.
[0009]
However, many problems to be solved still remain in the local water immersion type ultrasonic flaw detection. In particular, when the large-sized probe 1 is used, a necessary amount of water W (that is, the water film 13). ) Is urgently desired to be solved in the gap between the probe bottom surface 1a and the outer surface 9a to be inspected.
That is, when the size of the probe bottom surface 1a is up to about 60 mm × 60 mm, the thickness L of the water film 13 is relatively easily uniform over the entire surface of the probe bottom surface 1a. Can be held in.
[0010]
However, when the size of the probe bottom surface 1a is larger than about 100 mm × 100 mm, the water W does not sufficiently spread over the entire surface of the probe bottom surface 1a, and the thickness L of the water film 13 is reduced. In addition to non-uniformity, even a portion without the water film 13 is generated, and high-precision flaw detection becomes difficult.
In addition, the amount of water leaked to the outside from the gap between the probe housing lower end surface 2a and the frame lower end surface 3b increases, requiring a large amount of water W, and the thickness of the water film 13 by adjusting the water supply pressure or the water supply amount. It becomes difficult to control.
[0011]
[Problems to be solved by the invention]
The present invention has the above-mentioned problems in the conventional local water immersion type ultrasonic flaw detection, that is, (1) when the large probe 1 is used, the water W does not sufficiently spread to the bottom surface 1a of the probe. When the material outer surface 9a has many irregularities, highly accurate flaw detection is possible, and (2) the amount of water leaking from the gap between the housing lower end surface 2a increases, the amount of water consumption increases and the thickness of the water film 13 increases. It is intended to solve problems such as difficulty in control. Even when the large probe 1 is used, or in the case of the inspected material 9 having many irregularities on the outer surface 9a, the probe bottom surface 1a is provided. It is possible to provide a local water immersion jig for an ultrasonic probe which can secure a sufficient amount of water W and can always perform highly accurate and stable flaw detection.
[0012]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a local water immersion jig for an ultrasonic probe for inspecting flaws while injecting water as a contact medium into a gap with a material to be inspected. A frame body that is fixed to the outer surface and provided with a water supply passage for supplying water to the gap, and is provided with a space below the lower surface of the frame body, with its outer edge fixed to the frame body and the inner side A skirt material made of an elastic material whose edge is a free end that contacts the material to be inspected, and is positioned between the frame body and the skirt material and is hermetically fixed to the lower surface of the frame body. The basic structure of the present invention is that it is formed from a flat cylindrical elastic body having water passage holes for supplying water to the space .
[0013]
According to a second aspect of the present invention, in the first aspect of the invention, the outer edge of the flat cylindrical elastic body is fixed to the outer surface of the frame .
[0014]
According to a third aspect of the present invention, in the first aspect of the invention, the outer edge of the skirt material is fixed to the outer surface of the frame.
[0015]
The invention of claim 4 is the invention according to claim 1, wherein the skirt material is formed as a square hook-shaped integrally formed product, and the thickness thereof is gradually reduced inward.
[0016]
When the weight of the probe 1 or the like is applied, the back side 5a of the skirt material 5 covering the outer circumference of the probe housing 2 is pressed against the outer surface 9a of the material 9 to be inspected in an airtight manner by the elasticity of the skirt material itself. It is done.
Water W as a contact medium is injected into the space 5c above the skirt material 5 with a predetermined pressure, and the injected water W enters the gap between the probe bottom surface 1a and the outer surface 9a to be inspected.
Since the back side 5a of the skirt material is in close contact with the outer surface 9a to be inspected with a predetermined elastic force, there is relatively little water W leaking from the gap on the back side 5a of the skirt material. As a result, by appropriately adjusting the water injection pressure and the water injection flow rate, the probe 1 is lifted by a predetermined distance L like a hovercraft by the pressure of the injected water.
[0017]
When the probe 1 is attached to an XY scanner or the like for flaw detection, the distance L is set to a predetermined value in advance on the scanner side. Further, when the probe 1 is moved manually or by another drive source without using an XY scanner or the like, the probe 1 is moved at a predetermined speed along the outer surface 9a to be inspected.
During the flaw detection, the water W is continuously supplied with a predetermined pressure, thereby replenishing the amount of leaked water.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a local water immersion jig for an ultrasonic probe according to the present invention, and FIG. 2 is a cross-sectional view taken along the line E in FIG. In FIG. 1 and FIG. 2, the same reference numerals are assigned to members common to those in FIG. 3 and FIG.
[0019]
1 and 2, A is a local water immersion type ultrasonic flaw detector, B is a local water immersion jig for an ultrasonic probe, W is a contact medium (water), 1 is a probe, Probe housing, 3 is a cylindrical frame, 4 is a flat elastic body, 5 is a skirt material, 6 is a fixture, 7 is a joint, 8 is a water supply pipe, 9 is a material to be inspected, 10 is a mounting screw A hole 11 is a support piece, and the local water immersion jig B for an ultrasonic probe according to the present invention is formed by a frame 3, a flat elastic body 4, a skirt material 5, a fixture 6, a joint 7, and the like. ing.
[0020]
The cylindrical frame 3 is formed in a quadrangular shape with a steel material having a substantially square cross section. The probe housing 2 in which the probe 1 is housed is inserted into the frame 3 and a fixing screw (not shown) screwed into the mounting screw hole 10 is tightened, whereby the probe 1 is framed. 3 is inserted and fixed.
Further, as shown in FIG. 2, the frame 3 is provided with a water supply passage 3a, and a joint 8 of the water supply pipe 7 is fixed to the upper surface side thereof.
[0021]
The flat elastic body 4 is a flat hose body formed in a loop shape with a so-called elastic material, and is disposed on the lower surface 3 b side of the frame 3. The upper surface side 4c of the elastic body 4 is airtightly fixed to the frame lower surface 3b.
Further, the flat elastic body 4 is provided with water passage holes 4a and 4a 'at a portion facing the water supply passage 3a, and the water W passes through the water passage holes 4a and 4a'. 4 and the upper space 5c of the skirt material upper surface 5b.
Further, the outer edge of the flat elastic body 4 is supported and fixed to the outer surface of the frame body 3 via the fixing bracket 6 together with the outer edge of the skirt material 5 described later.
[0022]
In the embodiment shown in FIGS. 1 and 2, a flat hose having elasticity that is bent into a square loop shape is used as the elastic body 4. However, the shape of the elastic body 4 is not limited. Any shape may be used as long as it exhibits a cushioning action.
Moreover, although the flat elastic body 4 is used in the Example of FIG.1 and FIG.2, the said elastic body 4 can also be abbreviate | omitted.
[0023]
The skirt material 5 is integrally formed in a rectangular bowl shape by a thin synthetic resin plate having elasticity or a laminated board of a synthetic resin and a woven fabric, and the cross-sectional shape is formed in a so-called bowl shape. .
Further, the skirt material 5 is disposed so as to form a space 5 c having a predetermined size on the skirt material upper surface 5 b side, and the outer edge thereof is supported and fixed to the outer surface of the frame body 3 via the fixing metal 6. Has been. Furthermore, the front end side (inner front end) of the skirt material 5 is a free end, and is in contact with the outer surface 9a of the inspection material 9 with a predetermined pressure.
[0024]
In the present embodiment, the skirt material 5 is manufactured as an integrally formed product by molding or punching into a square bowl shape, but a plurality of skirt pieces are combined to form a square bowl shape. You may do it.
Further, the cross-sectional shape of the skirt material 5 is formed so that the thickness thereof becomes thinner toward the inner tip edge (the probe bottom surface 1a side).
[0025]
As described above, when the weight of the probe 1 or the like is applied, the back side 5a of the skirt material 5 that covers the outer circumference of the probe housing 2 is pressed in an airtight manner against the outer surface 9a of the material to be inspected due to its elasticity. . The supplied water W, which is the contact medium, is injected into the upper space 5c of the skirt material 5 with a predetermined pressure, and the injected water W enters the gap between the probe bottom surface 1a and the outer surface 9a to be inspected. Get in.
Since the back side 5a of the skirt material 5 is in close contact with the outer surface 9a to be inspected with a predetermined pressure, there is relatively no water leaking from the gap between the skirt material rear surface 5a and the outer surface 9a to be inspected. As a result, by appropriately adjusting the water injection pressure and the water injection flow rate, the probe 1 is lifted by a predetermined distance L like a hovercraft by the pressure of the injected water W, and in this state in a predetermined direction. Will be moved.
[0026]
【The invention's effect】
In the present invention, an elastic skirt material 5 is disposed with a space 5c below the lower surface 3b of the cylindrical frame 3 fixed to the outer periphery of the lower end of the probe housing 2, The inner edge of the skirt material 5 is a free end, and the outer edge is fixed to the frame 3. Water W supplied through the supply passage 3a provided in the frame 3 is supplied from the space 5c to the probe bottom surface 1a. It is configured to inject downward.
As a result, the water W supplied to the upper space 5c of the skirt material 5 is almost smoothly pressed into the gap between the probe 1 and the material to be inspected 9 without leaking outside. Even in the case of the large-sized probe 1 or when there are a large number of irregularities on the outer surface 9a to be inspected, water as a contact medium can be sufficiently secured in the gap, High-accuracy ultrasonic flaw detection is possible.
In addition, since the amount of water leaking to the outside through the gap is reduced, it becomes easy to control the gap size (that is, the thickness L of the water film 13) by adjusting the feed water pressure and the feed water flow rate, and the flaw detection is performed manually or with a simple scanner. This is particularly convenient.
As described above, the present invention has excellent practical utility regardless of a simple configuration.
[Brief description of the drawings]
FIG. 1 is a perspective view of a local water immersion jig for an ultrasonic probe according to the present invention.
FIG. 2 is a schematic cross-sectional view taken along the line II in FIG. 1;
FIG. 3 shows an example of a conventional local water immersion type ultrasonic probe.
FIG. 4 shows an example of a conventional local water immersion jig for an ultrasonic probe.
[Explanation of symbols]
A is a local water immersion type ultrasonic flaw detector, B is a local water immersion jig for an ultrasonic probe, W is a contact medium (water), L is a gap size, 1 is a probe, and 2 is a probe housing. 3 is a cylindrical frame, 3a is a water supply passage, 3b is a lower surface, 4 is a flat cylindrical elastic body, 4a and 4a 'are water holes, 4b is a lower surface side, 4c is an upper surface side, and 5 is a skirt material. 5a is the back surface of the skirt, 5b is the top surface of the skirt, 5c is the space, 6 is the fixing bracket, 7 is the joint, 8 is the water supply pipe, 9 is the material to be inspected, 9a is the outer surface of the material to be inspected, 10 Screw holes for mounting tools, 11 is a support piece for a local water immersion jig, 12 is a water supply groove, 13 is a water film, 14 is a probe holder, 15 is a lead wire, 16 is an XY scanner, and 17 is a Z scanner. .

Claims (4)

In a local water immersion jig of an ultrasonic probe that inspects flaws while injecting water as a contact medium into the gap with the material to be inspected, the probe is inserted and fixed to the outer surface of the lower end, A frame provided with a supply passage for water to be supplied to the gap, and a space provided below the lower surface of the frame. The outer edge of the frame is fixed to the frame, and the inner edge is used as a material to be inspected. A skirt material made of an elastic material as a free end to be contacted, and a water passage hole which is positioned between the frame body and the skirt material and is airtightly fixed to the lower surface of the frame body to supply water to the upper space of the skirt material A local water immersion jig for an ultrasonic probe, characterized in that it is formed from a flat cylindrical elastic body . The local water immersion jig for an ultrasonic probe according to claim 1, wherein the outer edge of the flat cylindrical elastic body is fixed to the outer surface of the frame .   The local water immersion jig for ultrasonic probes according to claim 1, wherein the outer edge of the skirt material is fixed to the outer surface of the frame.   The local water immersion jig for an ultrasonic probe according to claim 1, wherein the skirt material is an integrally formed product having a square bowl shape, and the thickness thereof is gradually reduced inward.

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