JP4871404B2 - Method and apparatus for measuring component concentration in test liquid used for wet fluorescent magnetic particle testing - Google Patents

Description

  In the present invention, the surface of the magnetized metal of the object to be inspected is brought into contact with a test liquid obtained by mixing at least the fluorescent magnetic powder and the dispersant, and the fluorescent magnetic powder is collected and adhered to the scratched surface. The present invention relates to a test liquid used in a wet fluorescent magnetic particle flaw detection test for flaw detection, and more particularly to a method and an apparatus for measuring a component concentration in a test liquid.

  The wet fluorescent magnetic particle test is standardized to JIS-Z-2320. In the wet fluorescent magnetic particle test system, steel parts such as automobile shafts and steel objects such as billets are magnetized. In the case where there are scratches such as cracks on the metal surface, the scratch is detected by attaching a test liquid made of magnetic powder or the like to the magnetic pole generated in the scratches. This is a well-known nondestructive inspection method. The test liquid used in this test is, for example, a mixture of each component such as fluorescent magnetic powder, dispersion material, and rust preventive material at a predetermined concentration, taken out from the test liquid tank with a pump, and brought into contact with the object to be inspected. The inspection liquid that has been subjected to the flaw detection test is returned to the inspection liquid tank and then used again for the flaw detection test and recycled. Conventionally, the concentration of the test solution is generally stirred well in the test solution tank, and the turbid test solution is sampled in a settling tube and allowed to stand for 30 minutes. By measuring the volume of the precipitated precipitate, the concentration (content) of the fluorescent magnetic powder was measured.

JP 2009-109424 A JP 2007-303824 A

  However, in the method of measuring the component concentration of the test liquid used in the wet fluorescent magnetic particle flaw detection test as described above, there is a problem that the concentration measurement value varies depending on the sampling situation. Therefore, for example, a method of measuring the brightness of a phosphor adhering to a pseudo defect as a guide (Japanese Patent Laid-Open No. 7-113787) or a method of measuring the brightness by reading the image with a CCD and processing the image (Japanese Patent Laid-Open No. 2009-). 75098) has been proposed, but variations in the measurement results are unavoidable due to the magnetization state of the test piece having the pseudo defect, the spraying state of the test solution, and the like. Further, the sampling operation described above is troublesome and there is a problem that workability is poor.

  Furthermore, only the concentration of the fluorescent magnetic powder can be measured by the method for measuring the component concentration of the test liquid described above. By the way, the concentration of the fluorescent magnetic powder in the test solution affects the visibility of the flaw detection, and the concentration of the dispersant determines the wettability of the test solution to the object to be inspected. As a method for evaluating the dispersant, the standard surface of the surface roughness standard piece and one surface of the transparent plate, which are disclosed in JP-A-8-128993, are fixed in a state where they face each other at a required interval, and the both surfaces are vertical. In a measuring device installed in a posture, the lower end of the sample is immersed in the sample, and the rising value of the sample rising by capillary action is measured, and the wettability of the dispersant in the test liquid is measured by the measured value. However, it does not measure the concentration of the dispersant itself, and a separate measuring device must be provided only for the evaluation of the dispersant, which increases costs and reduces work efficiency. There was also a problem.

  Therefore, an object of the present invention is to improve the measurement accuracy and workability, which can simultaneously measure the concentration of the dispersant and the fluorescent magnetic powder in the test solution by a simple method and can measure the concentration instantaneously and with high accuracy. The present invention provides a method and an apparatus for measuring the component concentration of a test liquid used in a wet fluorescent magnetic particle flaw detection test.

For this reason, in the invention described in claim 1, the surface of the magnetized metal of the object to be inspected is brought into contact with a test solution obtained by mixing at least fluorescent magnetic powder and a dispersing agent, and the fluorescence is applied to the scratch on the surface. A method for measuring the concentration of a component of the test liquid used in a wet fluorescent magnetic particle flaw detection test for flaw detection by collecting and adhering magnetic powder, the component concentration measuring method comprising: Using the transmitted light obtained by irradiating the test solution from one side of the measuring tool with the light of the light source that is introduced into the measuring tool having only one ultraviolet LED lamp and the visible light that is excited and emitted The concentration of the dispersing agent is measured based on the detection value of the ultraviolet detector that detects the transmitted light, and at the same time, based on the detection value of the fluorescence luminance detector that detects the visible light that is excited and emitted. The concentration of fluorescent magnetic powder Characterized in that it constant.

A second aspect of the present invention is the method of measuring a concentration of a test liquid used in the wet fluorescent magnetic particle flaw detection test according to the first aspect, wherein the ultraviolet detector is placed at a position facing the light source with the measuring tool in between. It is characterized by doing.

A third aspect of the present invention is the method of measuring a concentration of a test liquid component used in the wet fluorescent magnetic particle flaw detection test according to the first aspect, wherein the fluorescent luminance detector is around the measuring tool, and the measuring tool It is characterized in that it is installed within a range of 90 degrees positive and negative with respect to the irradiation direction of the irradiation light from the light source from the front center position.

According to a fourth aspect of the present invention, an inspection liquid obtained by mixing at least fluorescent magnetic powder and a dispersing agent is brought into contact with the magnetized metal surface of an object to be inspected, and the fluorescent magnetic powder is applied to a scratch on the metal surface. A component concentration measuring device for the test liquid used in a wet fluorescent magnetic particle flaw detection test for flaw detection by assembling and adhering, the component concentration measuring device comprising: a measuring tool for introducing the test solution; and An ultraviolet LED lamp comprising only one light source for irradiating the inspection liquid in the measuring tool with ultraviolet light, an ultraviolet detector for detecting transmitted light obtained from the inspection liquid by the ultraviolet irradiation, and a fluorescence intensity detector for detecting visible light emitted by exciting obtained from the test solution, based on the respective detected values of the UV detector and the fluorescence intensity detector, at the same time the concentration of each of the dispersing agent Characterized in that it comprises an information processing unit that calculates a concentration of the serial fluorescent magnetic particles.

According to a fifth aspect of the present invention, in the test liquid component concentration measuring apparatus used for the wet fluorescent magnetic particle flaw detection test according to the fourth aspect , the measuring tool is made of a fluororesin.

The invention according to claim 6 is the component concentration measuring apparatus for the test liquid used in the wet fluorescent magnetic particle flaw detection test according to claim 4 , wherein the measuring tool is installed in a dark box, and the ultraviolet LED lamp, The ultraviolet detector and the fluorescence luminance detector are provided in the dark box.

The invention according to claim 7 is a test liquid tank for storing a test liquid formed by mixing at least a fluorescent magnetic powder and a dispersing agent, and taking out the test liquid in the test liquid tank by a circulation means, and the test liquid tank A wet fluorescent magnetic particle flaw detector comprising: a transfer means for refluxing; and a flaw detection section for contacting the surface of the object to be magnetized with the inspection liquid in the transfer means to detect a flaw on the surface. It is a test apparatus, Comprising : The said transfer means is equipped with the component density | concentration measuring apparatus of Claims 4-6 which measures the component density | concentration of the said test liquid, The said transfer means pumps the said test liquid to the said flaw detection part. The test pipe is characterized in that the measuring instrument of the component concentration measuring device is connected to the test pipe.

According to an eighth aspect of the present invention, there is provided a test liquid tank for storing a test liquid formed by mixing at least a fluorescent magnetic powder and a dispersing agent, the test liquid in the test liquid tank being taken out by a circulation means, and the test liquid tank. A wet fluorescent magnetic particle flaw detector comprising: a transfer means for refluxing; and a flaw detection section for contacting the surface of the object to be magnetized with the inspection liquid in the transfer means to detect a flaw on the surface. It is a test apparatus, Comprising : The said transfer means is equipped with the component density | concentration measuring apparatus of Claims 4-6 which measures the component density | concentration of the said test liquid, The said transfer means is the measurement connected to the said test liquid tank A measuring pipe of the component concentration measuring apparatus is connected to the measuring pipe.

According to the first aspect of the present invention, the test liquid formed by mixing at least the fluorescent magnetic powder and the dispersing agent is brought into contact with the magnetized metal surface of the object to be inspected, and the fluorescent magnetic powder is collected at the scratched surface. And a method for measuring the component concentration of a test liquid used in a wet fluorescent magnetic particle flaw detection test for flaw detection by attaching the test solution to the transparent measuring instrument by introducing the test solution into a transparent measuring instrument. Using the transmitted light obtained by irradiating the test solution from one side of the measuring instrument and the visible light excited and emitted , the concentration of the dispersant is determined based on the detection value of the detector that detects the transmitted light. In addition to measuring, the concentration of fluorescent magnetic powder is measured based on the detection value of a detector that detects visible light that is excited and emitted, so it is easy to measure the concentration of a dispersant in a test solution that could not be measured in the past can do.

  Furthermore, the concentration of the dispersant and the fluorescent magnetic powder in the test solution can be simultaneously measured with a simple configuration using an optical method, and the concentrations can be measured instantaneously and with high accuracy. Therefore, it is possible to provide a method for measuring the component concentration of the test liquid used in the wet fluorescent magnetic particle flaw detection test with improved measurement accuracy and workability.

Further , since the light source is an ultraviolet LED lamp, the service life of the light source lamp that absorbs and excites the test solution is prolonged, and the cost can be reduced. Therefore, it is possible to provide a method for measuring the component concentration of the test liquid used in the wet fluorescent magnetic particle flaw detection test with improved productivity.

In addition , the detector that detects transmitted light is an ultraviolet detector, and the detector that detects visible light is a fluorescence luminance detector. Therefore, the transmittance (absorbance) of the ultraviolet detector and the concentration of the fluorescent magnetic powder are determined. Based on the correlation and the correlation between the fluorescence brightness by the fluorescence brightness detector and the concentration of the dispersant, the concentration of the fluorescent magnetic powder and the dispersant in the test liquid can be measured accurately and easily. Therefore, it is possible to provide a method for measuring the component concentration of the test liquid used in the wet fluorescent magnetic particle flaw detection test with improved measurement accuracy and workability.

According to the second aspect of the present invention, since the ultraviolet detector is installed at a position facing the light source across the measuring tool, the ultraviolet light that has entered the test liquid from the ultraviolet LED lamp and has passed through the liquid almost linearly. As for the transmitted light, the absorbance to the test solution can be stably measured. Therefore, it is possible to provide a method for measuring the component concentration of the test liquid used in the wet fluorescent magnetic particle flaw detection test with a simple configuration and improved measurement accuracy.

According to the third aspect of the present invention, the fluorescence luminance detector is around the measuring tool and within a range of 90 degrees from the front center position of the measuring tool to the irradiation direction of the irradiation light from the light source. Since the value of the fluorescence brightness also rises and falls according to the concentration of the fluorescent magnetic powder in the test solution, the fluorescence brightness detector is placed at the most suitable position for measurement or at any fluorescent magnetic powder concentration, regardless of the fluorescent magnetic powder concentration. Also, it can be installed at a position where the fluorescence luminance can be measured accurately. Therefore, it is possible to provide a method for measuring the component concentration of the test liquid used in the wet fluorescent magnetic particle flaw detection test with improved measurement accuracy.

According to the fourth aspect of the present invention, the test liquid obtained by mixing at least the fluorescent magnetic powder and the dispersant is brought into contact with the magnetized metal surface of the object to be inspected, and the fluorescent magnetic powder is applied to the scratch on the metal surface. A component concentration measuring device for a test liquid used in a wet fluorescent magnetic particle flaw detection test for flaw detection by collecting and adhering to a wound part, the component concentration measuring device comprising: a measuring tool for introducing a test liquid; An ultraviolet LED lamp consisting of only one light source for irradiating the test liquid with ultraviolet light, an ultraviolet detector for detecting transmitted light obtained from the test liquid by ultraviolet irradiation, and an excitation obtained from the test liquid by ultraviolet irradiation. a fluorescence intensity detector for detecting visible light emitted Te, based on the respective detected values of the UV detector and the fluorescence intensity detector, and a processing unit for calculating the concentration at the same time as the concentration of the fluorescent magnetic particle dispersant, respectively Since the concentration of the dispersant in the traditional inspection solution which could not be measured, it can be readily determined by constituent concentration measuring apparatus.

  In addition, the concentration of the dispersant and the fluorescent magnetic powder in the test liquid can be measured simultaneously, instantaneously and with high accuracy by this component concentration measuring apparatus. Furthermore, this component concentration measuring device is not limited to the installation location, but can be incorporated into a flaw detection test device, or the component concentration measuring device can be carried as a measurement unit, and the component concentration of a sampled test solution can be measured at an arbitrary location. be able to. Therefore, it is possible to provide an apparatus for measuring the component concentration of the test liquid used in the wet fluorescent magnetic particle flaw detection test with improved measurement accuracy and workability.

According to the invention described in claim 5 , since the measuring tool is made of fluororesin, the frequency of maintenance such as cleaning work in the measuring tool is reduced by reducing the adhesion of fluorescent magnetic powder in the test liquid to the inner surface of the measuring tool having a small friction coefficient. In addition, the measurement can be performed stably for a long time. Therefore, it is possible to provide an apparatus for measuring the component concentration of the test liquid used in the wet fluorescent magnetic particle flaw detection test with improved measurement accuracy and workability.

According to the sixth aspect of the present invention, the measuring tool is installed in the dark box, and the ultraviolet LED lamp, the ultraviolet detector, and the fluorescence luminance detector are provided in the dark box. It is possible to accurately measure the transmitted light of ultraviolet rays and the fluorescence brightness. Therefore, it is possible to provide an apparatus for measuring the component concentration of the test liquid used in the wet fluorescent magnetic particle flaw detection test with improved measurement accuracy.

According to the seventh aspect of the present invention, a test liquid tank for storing a test liquid formed by mixing at least the fluorescent magnetic powder and the dispersant, and taking out the test liquid in the test liquid tank by the circulation means, and the test liquid tank Wet fluorescent magnetic particle flaw detection tester comprising a transfer means for refluxing and a flaw detection section for contacting the surface of the magnetized metal of the object to be inspected with the inspection liquid in the transfer means to detect flaws on the surface The transfer means includes the component concentration measuring device according to claim 4 for measuring the component concentration of the test liquid, and the transfer means is a test pipe for pumping the test liquid to the flaw detection unit. Since the measuring instrument of the component concentration measuring device is connected to this test pipe, the component concentration measuring device is configured integrally with the wet fluorescent magnetic particle flaw detection testing device, and the testing liquid is sampled by sampling the inspection liquid as in the conventional case. Is concentrated in another place It is not necessary to perform the measurement.

  That is, the component concentration of the test liquid being transferred from the test liquid tank to the flaw detection unit can be instantaneously measured online as part of the flaw detection test immediately before spraying with the spraying device. Accordingly, it is possible to provide a wet fluorescent magnetic particle flaw detection test apparatus with improved workability.

According to the eighth aspect of the present invention, a test liquid tank for storing a test liquid formed by mixing at least the fluorescent magnetic powder and the dispersant, the test liquid in the test liquid tank is taken out by the circulation means, and the test liquid tank Wet fluorescent magnetic particle flaw detection tester comprising a transfer means for refluxing and a flaw detection section for contacting the surface of the magnetized metal of the object to be inspected with the inspection liquid in the transfer means to detect flaws on the surface The transfer means comprises the component concentration measuring device according to claim 4 to measure the component concentration of the test liquid, and the transfer means is a measurement pipe connected to the test liquid tank, Since the measuring instrument of the component concentration measuring device is connected to this measurement pipe, the component concentration measuring device is configured integrally with the wet fluorescent magnetic particle flaw detection test device, and the flaw detection test device is sampled by sampling the inspection liquid as in the past. Concentration of ingredients in another place It is not necessary to perform the measurement.

  In other words, the component concentration of the test liquid that is circulating from the test liquid tank to the test liquid tank via the measurement pipe can be instantaneously measured online as part of the flaw detection test. Accordingly, it is possible to provide a wet fluorescent magnetic particle flaw detection test apparatus with improved workability.

It is a perspective view which shows the component density | concentration measuring apparatus of the test liquid used for a wet fluorescent magnetic particle flaw detection test which shows an example of this invention. It is a top view of a component concentration measuring apparatus. It is a front view of a component concentration measuring apparatus. It is a perspective view which shows an example of a measuring tool. It is a front schematic diagram of the measurement tool periphery which shows the installation position of the light source and detector with respect to a measurement tool. It is a block control diagram of a component concentration measuring device. It is the top view which showed an example of the component density | concentration measuring apparatus provided with the stirring means of a test solution. It is the whole schematic diagram which showed an example of the wet fluorescent magnetic particle flaw detection test apparatus. It is an expansion schematic diagram of a flaw detection part. It is the perspective view which showed an example of the component density | concentration measuring apparatus with which a wet fluorescent magnetic particle test apparatus is equipped. It is the whole schematic diagram of the wet fluorescent magnetic particle flaw detection test apparatus which shows the example which attached the component density | concentration measuring apparatus to the piping for a measurement.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a component concentration measuring device for a test liquid used in a wet fluorescent magnetic particle flaw detection test, showing an example of the present invention, FIG. 2 is a plan view of the component concentration measuring device, and FIG. 3 is a front view of the component concentration measuring device. FIG.

First, as is well known, the inspection liquid used in the wet fluorescent magnetic particle flaw detection test is a mixture of fluorescent magnetic powder, a dispersant, and, if necessary, a rust inhibitor. Details of these components are described in, for example, the above-mentioned Japanese Patent Application Laid-Open No. 2009-109424 and Japanese Patent Application Laid-Open No. 2009-109424. Lumogen Yellow 50790 using a synthetic resin binder such as cellulose acetate-based synthetic resin or vinyl butyral-based synthetic resin for magnetically conductive particles such as iron oxide particles and pure iron particles: Brand name: BASF Co., Ltd. It is possible to use a median diameter of 3 to 70 μm to which fluorescent pigments such as those manufactured by Swada Co., Ltd. are attached, a volume reference distribution display—hereinafter, the same—with a true specific gravity of 2-5 g / cm ³ ; hereinafter referred to as “fluorescent magnetic powder”) it can.

  Moreover, a polyoxyalkylene allyl phenyl ether type nonionic surfactant and an anionic surfactant can be used for a dispersing agent, for example. In addition, as a rust preventive agent, sodium nitrite etc. can be used, for example. In addition, fluorescent magnetic powder, a dispersing agent, and a rust preventive agent are not limited to the component mentioned above.

  In the wet fluorescent magnetic particle flaw detection test, the inspection liquid prepared with the above components is brought into contact with a steel part such as a shaft of an automobile or an inspection object that is a steel material such as a billet. This is a well-known technique for flaw detection of a surface flaw by a magnetic powder pattern formed by collecting the magnetic powder dispersed in the inspection liquid on a flaw (a fine crack or pinhole existing on or near the surface of the inspection object). is there.

  The component concentration of the test liquid affects the accuracy of the flaw detection test. As described above, the concentration of the fluorescent magnetic powder in the test liquid affects the visibility of the flaw detection and the concentration of the dispersant. Affects the wettability of the test liquid to the test object, and each test liquid has a preferable component concentration depending on the test object.

  In a wet fluorescent magnetic particle flaw detection test apparatus, which will be described later, performed using such a test liquid, the test liquid taken out from the test liquid tank with a pump and brought into contact with the object to be inspected and subjected to the flaw detection test is returned to the test liquid tank. After that, the component concentration of the inspection liquid fluctuates every moment because it is used again for the flaw detection test, so that the component concentration of the inspection liquid can be used to conduct a flaw detection test on the inspection object with high accuracy. There is a need to constantly check.

  Therefore, the inventor of the present application pays attention to the fact that each component concentration in the test solution is related to the absorbance and illuminance by the irradiation light, and can simultaneously measure the concentration of the dispersant and the fluorescent magnetic powder in the test solution by a simple method, In addition, we have developed a method and apparatus for measuring the component concentration of the test liquid used in the wet fluorescent magnetic particle flaw detection test with improved measurement accuracy and workability, which makes it possible to measure these concentrations instantaneously and with high accuracy.

  First, when the fluorescent magnetic powder is irradiated with ultraviolet rays, a fluorescent substance such as a fluorescent pigment is excited to emit light, and thus the visible light thus emitted is used as a fluorescent luminance (illuminance). The presence of fluorescent magnetic powder can be confirmed by detecting with a detector. Therefore, when each test solution prepared by changing the concentration of fluorescent magnetic powder (prepared by mixing fluorescent magnetic powder and dispersant in water) is irradiated with ultraviolet light from a light source and the fluorescence luminance is detected by a fluorescence luminance detector, The relationship shown in the table (Table 1) was obtained.

測定条件
蛍光磁粉：ＬＹ−２０（マークテック株式会社製）
蛍光磁粉濃度（ｇ/Ｌ）：０、０．２、０．３、０．５、０．７５、１．０、１．２５
１．５、２．０
分散剤：ＥＣ−４（マークテック株式会社製）
分散剤濃度：０．５％
測定具：フッ素加工チューブ（直径６ｍｍ）
光源：汎用の紫外線ＬＥＤランプを使用
蛍光輝度検出器：汎用の検出器を使用 測定具の正面中心位置から、光源による照射光 の照射方向に対して４５度に位置に設置

Measurement conditions Fluorescent magnetic powder: LY-20 (manufactured by Marktec Corporation)
Fluorescent magnetic powder concentration (g / L): 0, 0.2, 0.3, 0.5, 0.75, 1.0, 1.25
1.5, 2.0
Dispersant: EC-4 (manufactured by Marktec Corporation)
Dispersant concentration: 0.5%
Measuring tool: Fluorine processing tube (diameter 6mm)
Light source: Uses a general-purpose UV LED lamp Fluorescence luminance detector: Uses a general-purpose detector Installed at 45 degrees from the front center position of the measuring tool to the irradiation direction of the light emitted from the light source

  As shown in Table 1, it was found that there is a correlation between the fluorescent magnetic powder concentration in the test solution and the fluorescent luminance, and the fluorescent luminance is increased as the fluorescent magnetic powder concentration is increased. Therefore, a calibration curve obtained from the above table is obtained by irradiating the test solution with ultraviolet light and detecting the visible light (visible light emitted by excitation) from the test solution as the fluorescence brightness by the fluorescence brightness detector. Based on the above, the concentration of the fluorescent magnetic powder in the test solution can be calculated.

Next, when the test liquid is irradiated with ultraviolet light, the ultraviolet light incident on the test liquid passes through the test liquid, and is transmitted from the direction opposite to the incident direction and emitted outside the liquid. At this time, the energy of light is transmitted by transmission or reflection, and the transmission of light is usually expressed as an absorbance concentration as in the following equation 1.
Absorbance density = -LOG ₁₀ (Radiation flux / incident flux) ... Equation 1
Therefore, each test solution prepared by changing the concentration of the dispersant (prepared by mixing fluorescent magnetic powder and dispersant in water) is irradiated with ultraviolet rays from a light source, and the transmitted UV light emitted from these test solutions is When detected by a known ultraviolet detector, the relationship shown in the following table (Table 2) was obtained.

測定条件
蛍光磁粉：ＬＹ−２０（マークテック株式会社製）
蛍光磁粉濃度（ｇ/Ｌ）：０．５
分散剤：ＥＣ−４（マークテック株式会社製）
分散剤濃度（％）：０．５、１．０、１．５、２．０、３．０、４．０
測定具：フッ素加工チューブ（直径６ｍｍ）
光源：汎用の紫外線ＬＥＤランプを使用
紫外線検出器：汎用の検出器を使用 測定具を挟んで光源と対向位置に設置

Measurement conditions Fluorescent magnetic powder: LY-20 (manufactured by Marktec Corporation)
Fluorescent magnetic powder concentration (g / L): 0.5
Dispersant: EC-4 (manufactured by Marktec Corporation)
Dispersant concentration (%): 0.5, 1.0, 1.5, 2.0, 3.0, 4.0
Measuring tool: Fluorine processing tube (diameter 6mm)
Light source: A general-purpose UV LED lamp is used. UV detector: A general-purpose detector is used.

  As shown in Table 2, it was found that there is a correlation between the dispersant concentration in the test solution and the ultraviolet light absorption concentration, and the ultraviolet light absorption concentration increases as the dispersant concentration increases. Accordingly, by irradiating the test solution with ultraviolet light, and detecting the transmitted light of the ultraviolet ray obtained from the test solution as the ultraviolet transmittance by the ultraviolet detector, the test solution contains the test solution based on the calibration curve obtained from Table 2 and the like. The concentration of the dispersant can be calculated.

  As shown in Table 2, each test solution prepared by changing the concentration of the dispersant was irradiated with ultraviolet rays from a light source in the same manner as in Table 1, and the fluorescence brightness was measured with a fluorescence brightness detector. Since no change in the fluorescence brightness was observed at any dispersant concentration, it was found that a fluorescence brightness detector could not be used to measure the dispersant concentration. Therefore, as described above, a fluorescence luminance detector is used for the concentration of the fluorescent magnetic powder in the test solution, and an ultraviolet detector is used for the concentration of the dispersant.

  Next, an apparatus for measuring the concentration of the fluorescent magnetic powder and the dispersant in these test solutions will be described. FIG. 1 is a perspective view showing a component concentration measuring device for a test liquid used in a wet fluorescent magnetic particle flaw detection test, showing an example of the present invention, FIG. 2 is a plan view of the component concentration measuring device, and FIG. 3 is a front view of the component concentration measuring device. 4 is a perspective view showing an example of the measuring tool, FIG. 5 is a schematic front view of the periphery of the measuring tool showing the installation positions of the light source and the detector with respect to the measuring tool, and FIG. 6 is a block control diagram of the component concentration measuring apparatus.

  First, as the component concentration measuring apparatus 1 for the test liquid, for example, as shown in FIGS. 1 to 3, the dark box 2, the measuring tool 3 installed in the dark box 2, and the dark box 2 are attached. And a light source 4 and detectors 5 and 6. In the following description, the component concentration measuring apparatus 1 will be described as a measuring apparatus unit that can measure the component concentration of the test liquid sampled from the test liquid tank 22 to be described later, with the installation location being free.

  First, the dark box 2 has, for example, a substantially trapezoidal shape (not limited) when viewed from the front, and the material is not particularly limited. The box 2 is made of a synthetic resin such as plastic or a metal such as aluminum, and has a dark room inside. It is. Further, a circular hole portion 7 (not limited to a shape corresponding to the outer shape of the measuring tool 3 described later) is provided on a straight line connecting the vicinity of the center of the front surface and the back surface of the dark box body 2. Further, the left and right shoulders of the top surface of the dark box body 2 are formed with inclined portions 8 in which the outer end portions of one or both of the left and right sides (both in the illustrated example) are inclined downward. The dark box body 2 may be provided with a gripping portion 16 as shown in FIG.

  Next, as shown in FIG. 4, the measuring tool 3 can be penetrated into the hole 7 of the dark box body 2 described above, and has a length substantially equal to the front-rear direction of the dark box body 2 and has a transparent side portion. It has a shape (not limited), and the material thereof is made of a fluororesin that can reduce the friction coefficient of the inner surface of the measuring tool 3. In addition, the diameter of a cylindrical part shall be about 6 mm (it is not limited), for example. The material of the measuring tool 3 is preferably the above-described fluororesin, but any material that can reduce the friction coefficient of the inner surface of the measuring tool 3 can be used as appropriate.

  In addition, the measuring tool 3 has, for example, a lid 10 provided with a flange 9 that is detachable from the main body through a spiral groove (not shown) at the base end (front side in FIG. 4). When the measuring tool 3 is installed in the hole 7 of the dark box body 2 by attaching or coloring a light shielding plate to the tip part 10 (the back side in FIG. 4) of the measuring tool 3 and the dark box body, 2 is shielded from light from the surroundings.

  Next, an ultraviolet LED (Light Emitting Diode) lamp 12 serving as a light source 4 is provided in the vicinity of the center of the left and right side surfaces of the dark box body 2 (the left side face shown in FIG. 1). Is attached as the irradiation direction.

  Further, the UV LED lamp 12 is mounted in the vicinity of the center of the other inner side surface (the right side surface shown in the back in FIG. 1) of the dark box body 2 and sandwiching the measuring tool 3 attached to the dark box body 2. An ultraviolet detector 5 is installed at a position opposite to the position. In the ultraviolet detector 5, the transmittance of the ultraviolet rays irradiated from the ultraviolet LED lamp 12 and obtained by passing through the test solution in the measuring tool 3 is detected. Since the ultraviolet detector 5 is a well-known technique, a detailed description thereof is omitted.

  Further, for example, a fluorescent luminance detector 6 is attached to the inner surface in the vicinity of the center of the inclined portion 8 on the side where the ultraviolet LED lamp 12 of the dark box 2 is installed (the upper left inclined surface shown in FIG. 1). It is done. In this fluorescence luminance detector 6, ultraviolet rays are irradiated onto the test solution in the measuring tool 3, and the fluorescence luminance of visible light (visible light that has been excited and emitted) obtained from the test solution is detected. Since the fluorescence luminance detector 6 is also a well-known technique, detailed description thereof is omitted.

  As shown in FIG. 5, the installation positions of the detectors 5 and 6 with respect to the light source 4 and the measuring tool 3 are as follows. First, the ultraviolet detector 5 is positioned opposite to the ultraviolet LED lamp 12 via the measuring tool 3 as described above. However, it is within an appropriate angle range from the extended line of the ultraviolet LED lamp 12 in the ultraviolet irradiation direction (incident direction into the test solution in the measuring instrument 3), and preferably in the dark box body 2 on the extended line. Install on the inner side of the.

  Further, the fluorescence luminance detector 6 is around the measuring tool 3 on the ultraviolet LED lamp 12 side, and from the front center position c of the measuring tool 3, the positive and negative 90 relative to the irradiation direction of the irradiation light by the ultraviolet LED lamp 12. It is within a range of degrees, for example, 40 degrees to 50 degrees, preferably 45 degrees, and is installed on the inner surface of the inclined portion 8 in the dark box 2. Note that the fluorescence luminance detector 6 is one of the appropriate angles based on experimental data as a position where the fluorescence luminance values of a wide range of concentrations of fluorescent magnetic powder can be accurately measured.

  Further, the range of the positive and negative 90 degrees is that the irradiation angles to the upper end and the lower end of the measuring tool 3 in FIG. 5 with respect to the irradiation center line of the ultraviolet rays emitted from the ultraviolet LED lamp 12 are equal, and either the positive or negative angle. This is because substantially the same detection value can be obtained from the fluorescence luminance detector 6 even if it is installed at the position, and in this embodiment, it is installed at +45 degrees above the irradiation center line in FIG.

  Further, as shown in FIG. 6, these detectors 5 and 6 are connected to an information processing unit 14 in the controller 13 installed in the dark box body 2. Calibration curve data of the fluorescent magnetic powder concentration with respect to the fluorescence luminance and the dispersant concentration with respect to the ultraviolet absorption concentration as shown in Tables 1 and 2 are input in advance.

  And this controller 13 is connected to the display part 15 as a display panel, such as a liquid crystal display, which is provided on the inclined part 8 surface of the dark box 2 and displays the fluorescent magnetic powder concentration and the dispersant concentration (for example, digital display). Let In addition to the dark box 2, the display unit 15 may be installed in a display device separate from the dark box 2 or in a wet fluorescent magnetic particle testing apparatus 21 described later.

  Further, the component concentration measuring apparatus 1 can be provided with a test solution stirring means. FIG. 7 is a plan view showing an example of a component concentration measuring apparatus having a test solution stirring means. As shown in FIG. 7, for example, a drive motor 16 is installed on the outer side of the back side of the dark box body 2 (the tip side of the mounted measuring tool 3). In this case, a recess 18 that can be fitted to the motor shaft 17 is attached to the tip of the measuring tool 3. When the measuring tool 3 is mounted on the dark box body 2, the recess 18 is fitted to the motor shaft 17. The measuring tool 3 is rotated about the front-rear direction of the dark box body 2 through the motor shaft 17 by the rotational drive of the drive motor 16.

  With such a configuration, the test solution loaded in the dark box body 2 is rotated by the drive motor 16 and the test solution in the measurement device 3 is stirred to load the test solution in the test solution 3. The components can be mixed more homogeneously in the test solution and their concentrations can be measured more accurately. The stirring means is not limited to the above, and a well-known technique may be used as appropriate.

  Here, for example, when it is desired to measure the component concentration of the test liquid in the test liquid tank 22 described later in the wet fluorescent magnetic particle flaw detection test apparatus 21 described later, first, the sample is sampled in the measuring tool 3 with the lid 10 removed. The measuring tool 3 loaded with the test solution and again attached with the lid 10 is inserted through the hole 7 of the dark box 2 in a rotatable manner. At this time, the distal end of the measuring tool 3 is stably supported by fitting the recess 18 into the hole 7 and the motor shaft 17 on the back surface of the dark box body 2, and the base end of the measuring tool 3 is The flange portion 9 of the lid body 10 serves as a stopper for the front plate of the dark box 2, and the measuring tool 3 can be stably mounted on the dark box body 2 without shifting.

  Then, by rotating the measuring tool 3 through the motor shaft 17 and the recess 18 by the power of the drive motor 16, the UV LED lamp 12 is turned on to the test solution stirred in the measuring tool 3 to emit ultraviolet light. Irradiate.

Next, first, ultraviolet light, which is transmitted light that has passed through the test solution, is detected by the UV detector 5 as the UV light absorption concentration, and the detection result is transmitted to the information processing unit 14 and is excited from the test solution. The visible light emitted in this manner is detected as fluorescence luminance by the fluorescence luminance detector 6, and the detection result is transmitted to the information processing unit 14.

  Then, the information processing unit 14 calculates the fluorescent magnetic powder concentration from the value of the ultraviolet light absorption concentration and the value of the dispersant concentration and the fluorescence luminance, based on the calibration curve data input in advance. Then, the controller 13 causes the display unit 15 to display the dispersant concentration and the fluorescent magnetic powder concentration.

  Therefore, the component concentration of the test solution can be measured in a short time of less than 1 second from the irradiation of the ultraviolet LED lamp 12 to the display of the dispersant concentration and the fluorescent magnetic powder concentration on the display unit 15. Since the component concentration can be measured while the test solution is stirred, an accurate measurement value can be obtained quickly.

With the configuration described above, the transmitted light obtained by introducing the test liquid into the transparent measuring tool 3 and irradiating the test liquid with the light from the ultraviolet LED lamp 12 as the light source 4 from one side of the measuring tool 3. The concentration of the dispersant is measured based on the detection value of the ultraviolet detector 5 that detects the transmitted light using the visible light excited and emitted, and the detection value of the fluorescence luminance detector 6 that detects the visible light is used. Based on this, the concentration of the fluorescent magnetic powder is measured, so the concentration of the dispersant in the test solution that could not be measured in the past can be measured simultaneously with a simple configuration using an optical method, and these concentrations can be measured instantaneously and with high accuracy. It can be measured easily.

  Further, since the light source 4 is the ultraviolet LED lamp 12, the service life of the light source lamp that absorbs and excites the test solution is increased, and the cost can be reduced.

The detector that detects the transmitted light is the ultraviolet ray detector 5 and the detector that detects the visible light is the fluorescence luminance detector 6. Therefore, the transmittance (absorbance) and the dispersing agent by the ultraviolet ray detector 5 are determined. Based on the correlation with the concentration and the correlation between the fluorescence brightness and the fluorescence magnetic powder concentration by the fluorescence brightness detector 6, the concentrations of the dispersant and the fluorescence magnetic powder in the test liquid can be measured accurately and easily.

  Further, since the ultraviolet detector 5 is installed at a position opposite to the light source 4 with the measuring tool 3 in between, the ultraviolet transmitted light that has entered the test solution from the ultraviolet LED lamp 12 and has passed through the solution almost straightly, The absorbance to the test solution can be stably measured.

  Further, the fluorescence luminance detector 6 is installed around the measuring tool 3 within a range of 90 degrees between the front center position c of the measuring tool 3 and the irradiation direction of the irradiation light from the light source 4. Since the value of the fluorescence brightness also rises and falls according to the fluorescence magnetic powder concentration of the test solution, the fluorescence brightness detector can accurately fluoresce at the most suitable position for measurement or at any fluorescent magnetic powder concentration, regardless of the fluorescence magnetic powder concentration. It can be installed at a position where luminance can be measured.

  Moreover, since the measuring tool 3 is made of a fluororesin, the adhesion of the fluorescent magnetic powder in the test liquid to the inner surface of the measuring tool having a small friction coefficient is reduced, the frequency of maintenance such as cleaning work in the measuring tool 3 is reduced, and a long period of time. Stable measurement can be performed.

  Further, the measuring tool 3 is installed in the dark box body 2, and the ultraviolet LED lamp 12, the ultraviolet detector 5, and the fluorescence luminance detector 6 are provided in the dark box body 2. It is possible to accurately measure the transmitted light and fluorescence brightness of ultraviolet rays.

  And this component concentration measuring apparatus 1 does not limit an installation place, but can make the component concentration measuring apparatus 1 portable as a measurement unit, and can measure the component density | concentration of the sampled test solution in arbitrary places. In addition, the component concentration measuring apparatus 1 is not limited to the shape as described above.

  Although the said component concentration measuring apparatus 1 demonstrated as a measuring device unit which can measure the component density | concentration of the test liquid sampled from the inside of a test liquid tank like the example mentioned above, this component concentration measuring apparatus is a wet fluorescent magnetic particle flaw detection test apparatus. The concentration of the test solution can be measured by incorporating it in the inside.

  FIG. 8 is an overall schematic view showing an example of a wet fluorescent magnetic particle flaw detection test apparatus, FIG. 9 is an enlarged schematic view of a flaw detection part, and FIG. 10 shows an example of a component concentration measuring apparatus provided in the wet fluorescent magnetic particle flaw detection test apparatus. FIG. 11 is an overall schematic view of a wet fluorescent magnetic particle flaw detection test apparatus in which a component concentration measurement device is attached to a measurement pipe.

  As shown in FIG. 8, the wet fluorescent magnetic particle flaw detector 21 (for example, trade name: Super Magna, manufactured by Mark Tech Co., Ltd.) includes a test liquid tank 22 for storing a test liquid, and a test liquid tank 22 in the test liquid tank 22. The inspection liquid is taken out by the circulation means 23 such as a pump, and the transfer means 24 such as a pipe for returning to the inspection liquid tank 21 and the inspection liquid in the transfer means 24 are applied to the magnetized metal surface of the object to be inspected. It is comprised from the flaw detection part 25 which is made to contact and flaw-detects the surface flaw part.

  As shown in FIG. 9, the flaw detection unit 25 includes a conveyance roller 26a, and conveys the inspection liquid on the belt conveyor 26b and the inspection liquid taken out from the inspection liquid tank 21 onto the inspection object. A spraying device 27 (not shown, including a circulating device for collecting the sprayed test solution and returning it to the test solution tank), a through coil 28a and a yoke coil 28b, etc. A magnetizing device 28 that magnetizes the body and a flaw detection device 29 that performs flaw detection by irradiating the inspection object with an ultraviolet flaw detection lamp 29a (black light) (not shown, but includes an image processing device such as a CCD camera that detects a flaw) It consists of.

  In addition, since the wet fluorescent magnetic particle flaw detection test apparatus 21 described above is a known technique as described above, detailed description thereof will be omitted.

  The test liquid component concentration measuring apparatus 1 ′ of the present invention is installed in the middle of the transfer means 24 between the test liquid tank 21 and the flaw detection part 25 in the wet fluorescent magnetic particle flaw detection test apparatus 21.

  In this case, the component concentration measuring apparatus 1 ′ is basically the same as the component concentration measuring apparatus 1, but as shown in FIG. 10, the measuring tool 3 ′ having a length that penetrates the hole 7 of the dark box body 2 is used. And both ends of the measuring tool 3 ′ are connected to the transfer means 24. At this time, both end portions of the measuring tool 3 ′ are detachably connected and fixed to the transfer means 24 with fasteners such as bolts and screws (not shown).

  The component concentration measuring device 1 ′ is provided with the light shielding means as described above in the vicinity of the hole 7 for inserting the measuring tool 3 ′, and the agitation means in the dark box 2 described in the component concentration measuring device 1 is installed. Is considered unnecessary.

  When the wet fluorescent magnetic particle flaw detection test apparatus 21 performs a flaw detection test on the object to be inspected, the inspection liquid stored in the inspection liquid tank 21 is taken out into the transfer means 24 by the circulation means 23 and is pumped to the flaw detection section 25. However, during this transfer, the inspection liquid in the transfer means 24 passes through the measuring tool 3 ′ of the component concentration measuring device 1 ′ and reaches the flaw detection part 25 from the transfer means 24 again.

In this component concentration measuring apparatus 1 ′, the test liquid passing through the measuring tool 3 ′ is irradiated by irradiating the test liquid in the measuring tool 3 ′ with the ultraviolet light of the ultraviolet LED lamp 12 from the light source 4 as described above. The concentration of the dispersing agent is measured from the ultraviolet light absorption density by detecting the ultraviolet light detector 5 with the ultraviolet light detector 5, and the fluorescent magnetic powder concentration is calculated from the fluorescence luminance by detecting the fluorescent light detector 6 by exciting the emitted light. Can be measured.

  By adopting such a configuration, the component concentration measuring apparatus 1 'is configured integrally with the wet fluorescent magnetic particle flaw detection test apparatus 21, and the component concentration is sampled at a place different from the flaw detection test apparatus by sampling the inspection liquid as in the past. It is not necessary to perform the measurement, and the component concentration of the test liquid being transferred from the test liquid tank 22 to the flaw detection unit 25 can be instantaneously measured online as part of the flaw detection test immediately before spraying with the spraying device 27.

  Further, as shown in FIG. 11, the component concentration measuring apparatus 1 ′ includes a circulating means 23 ′ such as a pump provided separately in the test liquid tank 22, and a transfer means 24 ′ that is a dedicated pipe for measuring the test liquid concentration. It can also be set as the wet fluorescent magnetic particle flaw detection test apparatus 21 'installed in the part.

  With such a configuration, the component concentration of the circulating test liquid returned from the test liquid tank 22 to the test liquid tank 22 via the transfer means 24 'such as a measurement pipe is online as part of the flaw detection test. It can be measured instantaneously. In this case, since a dedicated path for measuring the test liquid is provided separately from the path for spraying the test liquid, the concentration of the test liquid always remains in the dedicated path for measurement even if spraying stops due to inconvenience, for example. Can be measured.

As described above in detail, the test liquid formed by mixing at least the fluorescent magnetic powder and the dispersant is brought into contact with the magnetized metal surface of the object to be inspected, and the fluorescent magnetic powder is collected and adhered to the scratched surface. In the method and apparatus for measuring the component concentration of the test liquid used in the wet fluorescent magnetic particle flaw detection test for flaw detection, the test liquid is introduced into the transparent measuring tool 3, and the light from the light source 4 is supplied to the measuring tool 3. Using the transmitted light obtained by irradiating the test solution from the side and the visible light excited and emitted, and measuring the concentration of the dispersant based on the detection value of the ultraviolet detector 5 that detects the transmitted light, The concentration of the fluorescent magnetic powder is measured based on the detection value of the fluorescence luminance detector 6 that detects visible light excited and emitted.

  In the present invention, the surface of the magnetized metal of the object to be inspected is brought into contact with a test liquid formed by mixing at least fluorescent magnetic powder and a dispersing agent, and the fluorescent magnetic powder is collected and adhered to the scratched surface. The present invention can be applied to the concentration measurement of a test solution used in a wet fluorescent magnetic particle flaw detection test for flaw detection.

DESCRIPTION OF SYMBOLS 1,1 'Component density | concentration measuring apparatus 2 Dark box 3, 3' Measuring tool 4 Light source 5 Ultraviolet detector 6 Fluorescence luminance detector 7 Hole part 8 Inclination part 12 Ultraviolet LED lamp 13 Controller 14 Information processing part 21 Wet fluorescent magnetic particle flaw detection test Device 22 Test solution tank 23, 23 'Circulating means 24, 24' Transfer means c Front center position

Claims (8)

The surface of the magnetized metal of the object to be inspected is brought into contact with an inspection liquid obtained by mixing at least fluorescent magnetic powder and a dispersing agent, and the fluorescent magnetic powder is collected and adhered to the surface of the surface of the inspected portion. A component concentration measurement method for the test liquid used in a wet fluorescent magnetic particle flaw detection test for detecting a test sample, wherein the component concentration measurement method introduces the test solution into a measuring tool that is transparent and has stirring means, and includes one ultraviolet LED lamp. the light of the light source composed of only the use of a measuring instrument visible light from one side and emits light by excitation obtained through light and then irradiating the test solution, the detection of the ultraviolet detector for detecting the transmitted light The concentration of the fluorescent magnetic powder is measured based on a detection value of a fluorescence luminance detector that detects visible light that is excited and emitted at the same time as measuring the concentration of the dispersant based on the value. Wet fluorescent magnetism Component concentration measuring method of the test solution used in the flaw detection test.   The method of measuring a component concentration of a test liquid used in a wet fluorescent magnetic particle flaw detection test according to claim 1, wherein the ultraviolet detector is installed at a position facing the light source with the measuring tool interposed therebetween.   The fluorescence luminance detector is disposed around the measuring tool and within a range of 90 degrees between the front center position of the measuring tool and the irradiation direction of the irradiation light from the light source. The component concentration measuring method of the test liquid used for the wet fluorescent magnetic particle flaw detection test according to claim 1. The surface of the magnetized metal of the object to be inspected is brought into contact with an inspection liquid formed by mixing at least fluorescent magnetic powder and a dispersant, and the fluorescent magnetic powder is collected and adhered to the scratched portion of the metal surface. A component concentration measuring apparatus for the test liquid used in a wet fluorescent magnetic particle flaw detection test for flaw detection, wherein the component concentration measuring apparatus includes a measuring tool for introducing the test liquid, and an ultraviolet ray on the test liquid in the measuring tool. An ultraviolet LED lamp comprising only one light source for irradiating the light, an ultraviolet detector for detecting the transmitted light obtained from the test liquid by the ultraviolet irradiation, and an excitation obtained from the test liquid by the ultraviolet irradiation. calculating a fluorescence intensity detector for detecting the emitted visible light, based on each detection value of the UV detector and the fluorescence intensity detector, the concentration at the same time as the concentration of the fluorescent magnetic particles of each of the dispersing agent Test solution of analyte concentration measurement apparatus used in the wet fluorescent magnetic particle inspection, characterized in that it comprises an information processing unit that.   The said measuring tool consists of fluororesins, The component density | concentration measuring apparatus of the test liquid used for the wet fluorescent magnetic particle flaw detection test of Claim 4 characterized by the above-mentioned.   5. The wet method according to claim 4, wherein the measuring tool is installed in a dark box, and the ultraviolet LED lamp, the ultraviolet detector, and the fluorescence luminance detector are provided in the dark box. Equipment for measuring component concentration of test liquid used in fluorescent magnetic particle testing.   A test liquid tank for storing a test liquid formed by mixing at least a fluorescent magnetic powder and a dispersing agent, a transfer means for taking out the test liquid in the test liquid tank by a circulation means and refluxing the test liquid in the test liquid tank; A wet fluorescent magnetic particle testing apparatus comprising a flaw detection unit for contacting the surface of a magnetized metal of an object to be inspected with the inspection liquid in the transfer unit to perform a flaw detection on the surface flaw. Comprising the component concentration measuring device according to claim 4 for measuring the component concentration of the test solution, wherein the transfer means is a test pipe for pumping the test solution to the flaw detection unit, A wet fluorescent magnetic particle flaw detection test apparatus, wherein the measurement tool of the component concentration measurement apparatus is connected to a test pipe.   A test liquid tank for storing a test liquid formed by mixing at least a fluorescent magnetic powder and a dispersing agent, a transfer means for taking out the test liquid in the test liquid tank by a circulation means and refluxing the test liquid in the test liquid tank; A wet fluorescent magnetic particle testing apparatus comprising a flaw detection unit for contacting the surface of a magnetized metal of an object to be inspected with the inspection liquid in the transfer unit to perform a flaw detection on the surface flaw. Comprising the component concentration measuring device according to claim 4 for measuring the component concentration of the test solution, wherein the transfer means is a measurement pipe connected to the test solution tank, A wet fluorescent magnetic particle testing apparatus characterized in that the measuring instrument of the component concentration measuring apparatus is connected to a pipe.

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