A digital radiography (DR) pipe thickness measurement comparison test block
By designing a digital radiography (DR) pipe thickness measurement comparison test block, and utilizing a combination of magnetic blocks, straight rods, stepped test blocks, and round bars, the measurement error problem of traditional test blocks under complex working conditions was solved, achieving efficient and accurate pipe thickness measurement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING NANHUA INSPECTION & TESTING TECH CO LTD
- Filing Date
- 2025-07-30
- Publication Date
- 2026-05-26
AI Technical Summary
In complex working conditions such as multi-material, variable diameter, or corroded pipelines, existing technologies cannot effectively simulate the actual attenuation curve using traditional comparative test blocks, resulting in large errors in thickness inversion algorithms and insufficient data authority.
A digital radiographic (DR) pipe thickness measurement comparison test block is designed, comprising a magnetic block, a straight rod, a stepped test block, and a round bar. The stability of the device is ensured by threaded connections and a level. The arithmetic sequence layout of the stepped test blocks forms a clear visual hierarchy. Data is obtained by combining direct measurement and experimental comparison methods.
This method enables the simultaneous acquisition of data from both direct measurement and experimental comparison methods during a single installation, thereby improving the authority and accuracy of the data and reducing subjective interpretation errors.
Smart Images
Figure CN224285867U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of comparative test blocks, specifically relating to a comparative test block for digital radiography (DR) pipe thickness measurement. Background Technology
[0002] X-ray flaw detection is an inspection method that uses the fact that X-rays can penetrate metal materials and that the different absorption and scattering effects of the materials on the rays result in different light exposure of the film, thus forming images of varying density on the film, and thus judging the internal defects of the material.
[0003] DR inspection (Digital Radiography) is a non-destructive testing method based on digital technology. It uses X-rays to penetrate the object being inspected and a digital detector to directly acquire and analyze the image.
[0004] In the field of industrial pipeline inspection, digital radiography (DR) technology is widely used for wall thickness measurement due to its high efficiency and non-contact nature. However, existing technologies suffer from problems such as difficulty in calibration and the significant impact of material attenuation characteristics on measurement accuracy. Especially in complex conditions such as multi-material, variable-diameter, or corroded pipelines, traditional comparison test blocks are difficult to simulate the actual attenuation curve, leading to a significant increase in the error of the thickness inversion algorithm. Moreover, the changes in the data make the authority of the final data to be verified. Summary of the Invention
[0005] In view of the problems mentioned above in the background technology, the purpose of this utility model is to provide a digital radiography (DR) pipe thickness measurement comparison test block.
[0006] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:
[0007] A digital radiography (DR) pipe thickness measurement comparison test block includes a magnetic block, a straight rod connected to the center of the magnetic block, a stepped test block installed in the middle section of the straight rod, and a round bar fixedly installed at the end of the straight rod.
[0008] Furthermore, the magnetic block is an arc-shaped magnetic block, with its convex surface connected to the straight rod. The arc-shaped structure allows for better adaptation and contact with the outer surface of the pipe, and the increased contact area enhances the contact effect.
[0009] Furthermore, the magnetic block and the straight rod are connected by a threaded connection, which allows for disassembly and replacement.
[0010] Furthermore, the straight rod is equipped with a level. This design ensures that the straight rod is horizontal to the surface on which the workpiece is placed, thereby guaranteeing the measurement effect.
[0011] Furthermore, the thickness of each step in the stepped test block increases or decreases by the same value. This design, with its arithmetic sequence layout, creates a clear visual hierarchy, allowing inspectors to quickly identify and compare steps of different thicknesses, reducing subjective interpretation errors. In the creation of X-ray inspection exposure curves, thickness (d) has a linear relationship with exposure parameters (such as logIt). Uniform thickness intervals facilitate the direct generation of linear exposure curves, efficiently mapping the correspondence between thickness and blackness or grayscale values.
[0012] The beneficial effects of using this utility model are as follows:
[0013] The structural design of this utility model enables the simultaneous acquisition of data from both the direct measurement method using round bars and the comparative test method using stepped test blocks during a single installation. The two sets of data are compared and verified, making the data more authoritative. Attached Figure Description
[0014] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;
[0015] Figure 1 This is a schematic diagram of the structure of a digital radiography (DR) pipe thickness measurement comparison test block according to an embodiment of the present invention;
[0016] Figure 2 This is a schematic cross-sectional view of an embodiment of a digital radiography (DR) pipe thickness measurement comparison test block according to the present invention.
[0017] Figure 3 This is a schematic diagram illustrating the use of a digital radiography (DR) pipe thickness measurement comparison test block according to an embodiment of this utility model.
[0018] The symbols for the main components are explained below:
[0019] Magnetic block 1; straight rod 2; stepped test block 3; round bar 4; level 5. Detailed Implementation
[0020] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments. Example 1:
[0021] like Figure 1 , Figure 2 , Figure 3 As shown, a digital radiography (DR) pipe thickness measurement comparison test block of this utility model includes a magnetic block 1, a straight rod 2 connected to the center of the magnetic block 1, a stepped test block 3 installed in the middle of the straight rod 2, and a round rod 4 fixedly installed at the end of the straight rod 2. The lower horizontal plane of the stepped test block 3 is parallel to the tangent horizontal plane of the round rod 4.
[0022] In this implementation case, the test block is installed on the circular pipe to be tested by magnetic block 1, and the lower horizontal plane of the stepped test block 3 is parallel to the horizontal plane of the circular pipe to be tested. The round rod 4 connected to the end by the straight rod 2 is also parallel to the horizontal plane. Under the effect of magnetic force, the straight rod 2, the stepped test block 3 and the round rod 4 are all suspended. The X-ray source and the detector are located on both sides of the pipe. The X-ray source is perpendicular to the detector. The center line of the pipe to be tested is located on the vertical line between the X-ray source and the detector. The X-ray source emits X-rays, which irradiate the pipe to be tested, the stepped test block 3 and the round rod 4. At this time, two sets of data can be obtained.
[0023] A set of data is obtained through direct measurement, which is obtained through a circular rod 4. Based on the size calibration method, the distance from the center of the circular rod 4 to the detector is the same as that from the center of the measured cross section. The rod is imaged simultaneously with the pipe. By acquiring the imaging data, the thickness of the measured pipe can be calculated. The algorithm for this data is not difficult for technicians in related fields.
[0024] Another set of data can be obtained by comparing the comparison test block with the pipe thickness. The curve of the average gray value corresponding to different thicknesses can be obtained through the stepped test block 3. By measuring the gray value at the minimum pipe thickness, the corresponding thickness value can be found in the curve of the stepped test block 3, which is the thickness to be obtained. This test comparison method can also be understood by technical personnel in related fields.
[0025] Based on the above, by obtaining two sets of data through a single device and comparing the two sets of data, more accurate data can be obtained compared to a single comparison. Example 2:
[0026] like Figure 1 As shown, the magnetic block 1 is an arc-shaped magnetic block. The convex surface of the arc-shaped magnetic block is connected to the straight rod 2. The arc-shaped structure can better fit and contact the outer surface of the pipe, and the enlarged contact surface can enhance the contact effect.
[0027] In this implementation case, the curvature of the magnetic block 1 can be specifically determined according to the diameter range of the pipe being tested in actual use. Furthermore, friction textures are set on the contact surface of the magnetic block to enhance the anti-slip effect after adsorption. It should be noted that the magnitude of the suction force must be sufficient to support the weight of the entire device. Example 3:
[0028] like Figure 2 As shown, the magnetic block 1 and the straight rod 2 are connected by a threaded connection. This design allows for disassembly and replacement.
[0029] In this implementation case, the threaded connection method can realize the disassembly between the magnetic block 1 and the straight rod 2, thereby allowing the replacement of magnetic blocks 1 of more specifications to adapt to the usage requirements of different occasions, or to replace the magnetic blocks 1 that have lost their attraction. It should be noted that after the connection, it is necessary to ensure that the horizontal plane of the lowest horizontal line of the magnetic block is parallel to the horizontal plane of the ground of the stepped test block 3. Example 4:
[0030] like Figure 1 As shown, a level 5 is installed on the straight rod 2. This design ensures that the straight rod 2 is horizontal to the surface on which the workpiece is placed, thereby ensuring the measurement effect.
[0031] In this implementation case, the choice of level 5 is not limited, including but not limited to mercury and digital, and the installation method is also unaffected, including but not limited to screw connection, adhesive and welding. Example 5:
[0032] like Figure 1 As shown, the thickness of each step in the stepped test block 3 increases or decreases by the same value. This design, with its arithmetic sequence layout, creates a clear visual hierarchy, enabling inspectors to quickly identify and compare steps of different thicknesses, reducing subjective interpretation errors. In the creation of X-ray inspection exposure curves, the thickness (d) has a linear relationship with the exposure parameters (such as logIt). Uniform thickness intervals facilitate the direct generation of linear exposure curves, efficiently mapping the correspondence between thickness and blackness or grayscale values.
[0033] In this implementation case, the specific numbers and number of steps in the arithmetic progression depend on the requirements, and the overall specifications are not limited.
[0034] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.
Claims
1. A comparative test block for digital radiography (DR) pipe thickness measurement, characterized in that: It includes a magnetic block (1), a straight rod (2) connected to the center of the magnetic block (1), a stepped test block (3) installed in the middle section of the straight rod (2), and a round rod (4) fixedly installed at the end of the straight rod (2).
2. The digital radiography (DR) pipe thickness measurement comparison test block according to claim 1, characterized in that: The magnetic block (1) is an arc-shaped magnetic block, and the convex surface of the arc-shaped magnetic block is connected to the straight rod (2).
3. The digital radiography (DR) pipe thickness measurement comparison test block according to claim 2, characterized in that: The magnetic block (1) and the straight rod (2) are connected by a threaded connection.
4. The digital radiography (DR) pipe thickness measurement comparison test block according to claim 3, characterized in that: The straight rod (2) is equipped with a level (5).
5. The digital radiography (DR) pipe thickness measurement comparison test block according to claim 4, characterized in that: The thickness of each step in the stepped test block (3) is increased or decreased by the same value.