Portable fluorescent penetrant detection defect size measuring device, measuring method and application

Abstract

The invention provides a portable fluorescent penetrant detection defect size measuring device, a measuring method and application, and belongs to the technical field of nondestructive testing. According to the invention, automatic focusing and calibration of the measurement unit are realized through the calibration unit, accurate positioning is realized to reduce personal errors, measurement conditions are provided through the measurement condition supply unit to control the detection environment, the measurement unit automatically completes defect size measurement, data storage and photographing recording, and automation and precision of the detection process are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of non-destructive testing, in particular to a portable fluorescent penetrant testing defect size measuring device, a measuring method of the measuring device and application in the field of non-destructive penetrant testing. BACKGROUND

[0002] In the field of non-destructive testing, penetrant testing is one of the five conventional non-destructive testing methods, which is based on the principle of capillary action and is used for detecting open defects on the surface of non-porous metal and non-metal test pieces. A penetrant solution containing fluorescent dye is applied to the surface of the test piece, and based on the capillary phenomenon, the penetrant solution penetrates into various small open defects on the surface, the excess penetrant solution on the surface of the test piece is removed, and after drying, a developer is applied. The penetrant solution in the defects penetrates back to the surface of the workpiece under the action of capillary phenomenon, forming an enlarged defect display. Under black light irradiation, the defects show yellow-green fluorescent display, and the defect morphology and distribution state can be identified by visual inspection.

[0003] The test block refers to a test piece with artificial or natural defects, and the defect size parameter is one of the key factors affecting the sensitivity of penetrant testing and is also a core element determining the performance of the detection system. In order to accurately quantify the penetrant testing sensitivity and the detection results, it is necessary to first verify the penetrant testing sensitivity, and to accurately measure the defect display of the confirmed defects in the workpiece, and to record the shape and distribution state of the defect display for positioning, quantification and qualitative evaluation. Then, according to the reference standard or technical document, the quality grade is evaluated to determine whether it is qualified or not. After defect evaluation, it needs to be recorded and photographed under black light to obtain the defect fluorescent display image in the background of the workpiece, so as to ensure the authenticity of the defect record. SUMMARY

[0004] Therefore, in order to accurately quantify the penetrant testing sensitivity and the detection results, the present application provides a portable fluorescent penetrant testing defect size measuring device, a measuring method and application, which realizes automatic focusing and calibration of the measuring unit through the calibration unit, realizes accurate positioning to reduce human error, provides measurement conditions to control the detection environment through the measurement condition supply unit, and the measuring unit automatically completes defect size measurement, data storage and photographic recording, realizing automation and precision of the detection process.

[0005] In order to achieve the above purpose, the present application provides the following technical scheme:

[0006] In a first aspect, the present application provides a portable fluorescent penetrant testing defect size measuring device, comprising:

[0007] A measurement condition supply unit for providing a fluorescent excitation light source, a low light condition and a bearing base of the workpiece to be detected;

[0008] The measuring unit is used to calibrate, measure and store the defect size of the inspected workpiece after imaging;

[0009] The calibration unit is used to position, focus and calibrate the measuring unit to complete the calibration work.

[0010] Preferably, the measurement condition supply unit includes:

[0011] a base having a dark chamber disposed thereon for providing low-light conditions;

[0012] A black light lamp is arranged in the dark room to provide a fluorescent excitation light source;

[0013] The measuring platform is arranged in the darkroom and is used to provide a bearing foundation for the inspected workpiece.

[0014] Preferably, the visible light illuminance of the darkroom is not greater than 20 lx, and the irradiance of the black light on the workpiece surface is not less than 1000 μW / cm 2 .

[0015] Preferably, the calibration unit includes a lifting control mechanism and a calibration platform;

[0016] The calibration platform and / or the measuring unit are slidably connected to the lifting control mechanism.

[0017] Preferably, the lifting control mechanism includes a guide rail and a slider slidably connected to the guide rail;

[0018] The calibration platform and / or the measuring unit are connected to the slider.

[0019] Preferably, the calibration platform is at the same height as the measuring platform of the measuring unit, so as to ensure the consistency of the focusing parameters of the measuring unit.

[0020] Preferably, the measuring unit comprises:

[0021] A microscope, used for capturing a fluorescent image of defects of the inspected workpiece;

[0022] The measuring system is used to measure the inspected workpiece after imaging and to take photos of the measurement results for storage.

[0023] In a second aspect, the present invention provides a measurement method for the portable fluorescent penetrant inspection defect size measurement device, comprising the following steps:

[0024] Step (1), calibrating the measuring unit using the calibration unit;

[0025] Step (2), placing the inspected workpiece after imaging on a supporting base, and turning on the fluorescent excitation light source and low light conditions;

[0026] Step (3), the measurement unit calibrates, measures and stores the defect size of the developed workpiece.

[0027] In a third aspect, the application provides the application of the above-mentioned portable fluorescent penetrant testing defect size measuring device or the above-mentioned measuring method of the portable fluorescent penetrant testing defect size measuring device in non-destructive penetration testing.

[0028] Compared with the prior art, the application has the following beneficial effects:

[0029] (1) Improved measurement accuracy and reliability

[0030] Precise positioning of mechanical structure: the use of lifting control mechanism, calibration platform and measurement platform design realizes the consistency and precise positioning of the test piece height, replaces manual operation and greatly reduces human error.

[0031] Standardized detection environment: integrated black light and darkroom, ensuring that the surface irradiance of the workpiece during detection is ≥1000 μW / cm 2 , the visible light illuminance of the darkroom is ≤20lx, which meets the strict environmental requirements of fluorescent penetrant testing and avoids missed detection or misjudgment caused by external light interference.

[0032] (2) Automatic and intelligent detection process

[0033] Automatic focusing and calibration: through the linkage of microscope, calibration platform, measurement system and lifting control mechanism, automatic focusing and system calibration are completed, the tedious steps of manual focusing are saved, and the detection efficiency is improved.

[0034] Automatic data recording and tracing: the measurement system saves the defect size, position, distribution data and fluorescent image in real time, forms traceable detection records, facilitates subsequent analysis and quality evaluation, and solves the problems of easy omission and difficult tracing of traditional manual recording.

[0035] (3) Enhanced portability and scene adaptability

[0036] Integrated design: the core modules such as measurement condition supply unit, measurement unit and calibration unit are integrated in the portable mechanical structure, supporting laboratory and on-site detection scene switching, meeting the rapid detection needs in different environments.

[0037] Flexible operation and real-time adjustment: the position of the test piece can be adjusted during the detection process, the technician can observe and judge abnormal conditions in real time, optimize the detection parameters in time, and improve the on-site problem handling capability.

[0038] In summary, the application effectively solves the problems of low precision, poor efficiency and difficult tracing in traditional penetration testing, and provides an efficient and reliable portable solution for the field of non-destructive testing. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A structural schematic diagram of the present application is shown in the figure;

[0040] In the figure, 1, base; 2, microscope; 3, measurement system; 4, lifting control mechanism; 5, black light lamp; 6, darkroom; 7, calibration platform; 8, measurement platform; 9, rotating arm. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0042] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0043] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be understood broadly, for example, "connected" can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] As Figure 1 shown, the present application provides a portable fluorescent penetration detection defect size measuring device, comprising:

[0045] A measurement condition supply unit for providing a fluorescent excitation light source, a low light condition and a bearing base for the workpiece under test. Wherein, the measurement condition supply unit preferably comprises a base 1, on which a darkroom 6 for providing a low light condition is arranged; a black light lamp 5 arranged in the darkroom 6 for providing a fluorescent excitation light source; a measurement platform 8 arranged in the darkroom 6 for providing a bearing base for the workpiece under test.

[0046] A measuring unit is configured to calibrate, measure and store the size of the defects of the inspected workpiece after development. The measuring unit preferably comprises a microscope 2 configured to capture a fluorescence image of the defects of the inspected workpiece, and a measuring system 3 configured to measure the inspected workpiece after development and save the measurement results.

[0047] A calibration unit is configured to position, focus and calibrate the measuring unit to complete calibration. The calibration unit preferably comprises a lifting control mechanism 4 and a calibration platform 7. The calibration platform 7 and / or the measuring unit are slidingly connected to the lifting control mechanism 4.

[0048] In the present application, the base 1 is located at the bottom of the device and provides a basic support for the overall mechanical structure. The darkroom 6 and the lifting control mechanism 4 are fixed to the base 1, the black light 5, the calibration platform 7, the measuring platform 8 and the rotating arm 9 are located in the darkroom 6, and the base 1 constitutes the bearing frame of the device. The base 1 is used to integrate all the core components to ensure the stability of the device structure and avoid measurement deviation caused by vibration during detection. The modular integrated design provides a basis for portability while ensuring the relative position of each component is fixed to maintain detection accuracy.

[0049] The microscope 2 is installed on the sliding block of the lifting control mechanism 4, located directly above the calibration platform 7 and the measuring platform 8, connected to the measuring system 3, and the height is adjusted by the lifting control mechanism 4. The measuring system 3 captures the fluorescence image of the surface defects of the inspected workpiece to provide the basis for optical magnification of size measurement. With the automatic focusing function, it can quickly and clearly image, replacing manual focusing and improving detection efficiency.

[0050] The measuring system 3 is integrated into the device control system and is linked with the microscope 2 and the lifting control mechanism 4. The measuring system 3 receives the image signal transmitted by the microscope 2, controls the lifting mechanism to complete focusing and calibration, and synchronously stores the measurement data. The measuring system 3 is used to complete system calibration (calibration of measurement accuracy), measurement of defect size, position and distribution, and automatic saving of defect image and data record. The measuring system 3 realizes the automation of the detection process, replaces the traditional human eye (or human eye assisted by magnifying glass) observation and manual recording of defect display, avoids manual recording errors, and provides traceable digital detection archives. With the automatic focusing function of the calibration unit, it can quickly and clearly image, replacing manual focusing and improving detection efficiency.

[0051] The lifting control mechanism 4 is fixed to one side of the base 1 and is composed of a guide rail and a slidingly connected sliding block. The sliding block is connected to the microscope 2 of the measuring unit and / or the calibration platform 7 of the calibration unit, so that it can move up and down along the guide rail to adjust the distance between the microscope 2 and the test piece (calibration test piece or inspected workpiece), realize automatic focusing and height calibration. Through mechanical precise control, manual focusing is replaced to ensure focusing accuracy and shorten calibration time.

[0052] The black light 5 is installed inside the darkroom 6 and faces the measuring platform 8. The black light 5 is linked with the darkroom 6 and provides a fluorescence excitation light source when turned on. The black light 5 emits ultraviolet light of a specific wavelength, causing the yellow-green fluorescence of the fluorescent penetrant in the defects, facilitating observation by the microscope 2. In the present application, the black light 5 is used to ensure that the surface irradiance of the workpiece is greater than or equal to 1000 muW / cm2, meeting the light source intensity standard for fluorescence detection and improving the clarity of defect display.

[0053] The darkroom 6 covers the measuring platform 8 and is fixed to the base 1, with the black light 5 integrated inside, forming a closed detection space with the measuring platform 8. The darkroom 6 is used to isolate external light, controlling the visible light illuminance of the darkroom 6 to be less than or equal to 20 lx, avoiding environmental light interference with the fluorescence display. The darkroom 6 is used to build a standardized detection environment, eliminating missed detection or misjudgment caused by external light interference, and ensuring detection sensitivity.

[0054] The calibration platform 7 is located on one side of the base 1, preferably at the same height as the measuring platform 8. The calibration platform 7 is connected to the lifting control mechanism 4 through a sliding block and can adjust the height with the lifting mechanism. The calibration platform 7 is used to place calibration test pieces, ensuring that they are at the same height as the measuring platform 8, facilitating accurate focusing of the microscope 2. By adjusting the lifting control mechanism 4, the calibration test pieces and the workpiece under test are at the same height, ensuring measurement accuracy.

[0055] The measuring platform 8 is located inside the darkroom 6 and is at the same height as the calibration platform 7. It is used to carry the workpiece under test, ensuring that its surface is perpendicular to the optical axis of the microscope 2. The measuring platform 8 provides a stable foundation for placing the workpiece, forming a standardized detection environment with the darkroom 6 and the black light 5. Its height is consistent with that of the calibration platform 7, avoiding measurement errors caused by height deviations of the workpiece and improving detection consistency.

[0056] The portable fluorescence penetrant detection defect size measurement device provided by the present application has the following advantages:

[0057] Precision assurance: double-platform equal-height design, mechanical precise positioning, and standardized lighting environment greatly reduce human and environmental errors;

[0058] Efficiency improvement: automatic focusing and data storage functions simplify the operation process and shorten the detection time;

[0059] Scene adaptation: integrated portable structure supports laboratory and on-site detection, meeting the diverse needs of industrial non-destructive testing.

[0060] Compared with the traditional manual measurement and recording method, the present application not only provides more accurate results, but also facilitates the detection personnel to find abnormal conditions during penetration testing and make timely judgments and adjustments. Moreover, it can record the situation at the time of penetration testing, facilitating subsequent analysis and tracing.

[0061] In a second aspect, the present application provides a measurement method of the portable fluorescent penetrant inspection defect size measurement device, comprising the following steps:

[0062] Step (1), calibrating the measurement unit by using the calibration unit;

[0063] Step (2), placing the detected workpiece after development on the bearing base, and turning on the fluorescent excitation light source and low light conditions;

[0064] Step (3), calibrating, measuring and storing the defect size of the detected workpiece after development by the measurement unit.

[0065] Specifically as follows:

[0066] Before detection, the focusing and calibration are first completed by using the calibration platform 7, the microscope 2 and the calibration measurement software. Then, the penetration detection test block or the detected workpiece strictly follows the penetration detection process: preparation, penetration, cleaning, drying, development, detection and post-processing. The developed penetration test block or the detected workpiece is fixed on the measurement platform 8, which is slidingly connected between the measurement platform 8 and the lifting control mechanism 4. The measurement platform 8 is rotated to the front of the microscope 2 by the rotating arm 9. At this time, it is necessary to ensure that the height from the microscope 2 to the calibration sheet and to the surface of the developed test block or workpiece is consistent. The black light lamp 5 is turned on, the light source of the darkroom 6 is turned off, and the surface irradiance of the test block or workpiece is ensured to be not less than 1000 μW / cm 2 , and the ambient visible light intensity of the darkroom 6 should be controlled within 20 lx. Then, the calibration measurement system 3 is used to accurately measure the defect size of the developed test block or workpiece. After measurement, the developed penetration test block or detected workpiece should be post-processed.

[0067] After the measurement is completed, the measurement data will be automatically recorded and stored by the system; the stored record can clearly present the specific position, size and distribution characteristics of the defects of the developed test block or workpiece. By adjusting the mechanical structure configuration, the measurement needs of the laboratory and the scene for the defect size of the developed penetration test block or detected workpiece can be met.

[0068] The portable fluorescent penetrant inspection defect size measurement device or the measurement method of the portable fluorescent penetrant inspection defect size measurement device provided by the present application not only applies to non-destructive penetration detection, but also can be applied to other scenes. In the precise identification and evaluation of material surface defects, such as the fields of aerospace and automobile manufacturing, the product quality and safety performance are effectively improved. In addition, the multi-scene application of the device not only expands its use range, but also provides reliable technical support for various industries through efficient data management and accurate measurement results, further promoting the progress and development of non-destructive testing technology.

[0069] The above merely describes preferred specific embodiments of the present application. The protection scope of the present application is not limited to this; any person skilled in the art should be covered in the protection scope of the present application according to the technical solution and the improvement concept of the present application, equivalent replacement or change of the present application within the technical range disclosed by the present application.

Claims

1. A portable fluorescent penetrant inspection defect size measuring device, characterized in that: include: A measurement condition supply unit, used to provide a fluorescent excitation light source, low-light conditions, and a supporting base for the workpiece to be inspected; The measuring unit is used to calibrate, measure and store the defect size of the inspected workpiece after imaging; The calibration unit is used to position, focus and calibrate the measuring unit to complete the calibration work.

2. A portable fluorescent penetrant inspection defect size measuring device according to claim 1, characterized in that: The measurement condition supply unit includes: a base having a dark chamber disposed thereon for providing low-light conditions; A black light lamp is arranged in the dark room to provide a fluorescent excitation light source; The measuring platform is arranged in the darkroom and is used to provide a bearing foundation for the inspected workpiece.

3. A portable fluorescent penetrant inspection defect size measuring device according to claim 2, characterized in that: The visible light illuminance of the darkroom is not greater than 20 lx, and the irradiance of the black light on the workpiece surface is not less than 1000 μW / cm 2 .

4. The portable fluorescent penetrant inspection defect size measuring device according to claim 1 is characterized in that: The calibration unit includes a lifting control mechanism and a calibration platform; The calibration platform and / or the measuring unit are slidably connected to the lifting control mechanism.

5. The portable fluorescent penetrant inspection defect size measuring device according to claim 4 is characterized in that: The lifting control mechanism includes a guide rail and a slider slidably connected to the guide rail; The calibration platform and / or the measuring unit are connected to the slider.

6. The portable fluorescent penetrant inspection defect size measuring device according to claim 4, characterized in that: The calibration platform is at the same height as the measuring platform of the measuring unit, so as to ensure the consistency of the focusing parameters of the measuring unit.

7. A portable fluorescent penetrant inspection defect size measuring device according to any one of claims 1 to 6, characterized in that: The measuring unit comprises: A microscope, used for capturing a fluorescent image of defects of the inspected workpiece; The measuring system is used to measure the inspected workpiece after imaging and to take photos of the measurement results for storage.

8. A measuring method for a portable fluorescent penetrant defect size measuring device according to any one of claims 1 to 7, characterized in that: The steps include: Step (1), calibrating the measuring unit using the calibration unit; Step (2), placing the inspected workpiece after imaging on a supporting base, and turning on the fluorescent excitation light source and low light conditions; Step (3): The measuring unit calibrates, measures and stores the defect size of the inspected workpiece after imaging.

9. Application of the portable fluorescent penetrant inspection defect size measuring device according to any one of claims 1 to 7 or the measuring method of the portable fluorescent penetrant inspection defect size measuring device according to claim 8 in non-destructive penetrant inspection.

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