Magnetic flux leakage test reference block

Abstract

The utility model relates to the technical field of magnetic flux leakage detection technology, in particular to a magnetic flux leakage detection reference block which comprises a test block body used for comparing with a detected pipe fitting in the magnetic flux leakage detection process, and the top and the bottom of the test block body are a first machining face and a second machining face respectively. The first machining face is provided with a first machining notch groove set, the first machining notch groove set comprises a plurality of first artificial defects, the second machining face is provided with a second machining notch groove set, and the second machining notch groove set comprises a plurality of second artificial defects. And the first artificial defect and the second artificial defect coincide in the direction perpendicular to the plane where the first machining surface is located according to a certain proportion. According to the utility model, the first artificial defect and the second artificial defect coincide in the direction perpendicular to the plane where the first processing surface is located, so that the condition of coexistence of defects on the inner side and the outer side of the detected pipe fitting is successfully simulated. Therefore, the reference block is closer to an actual detection environment, and the evaluation accuracy is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of magnetic flux leakage detection technology, and specifically relates to a magnetic flux leakage detection comparison test block. BACKGROUND

[0002] As one of nondestructive testing methods, magnetic flux leakage detection has many advantages, such as easy automation, high detection efficiency, on-line detection without production stoppage, no environmental pollution, etc. It is widely used in the detection of surface and near-surface defects such as corrosion and cracks of various ferromagnetic materials such as oil and gas pipelines, oil tank bottom plates, steel wire ropes, steel plates and steel pipes in the petroleum, chemical and steel industries.

[0003] Generally, in actual detection, the comparison test piece is mainly used for signal equivalent or quantitative evaluation and acceptance level determination of defects. The current standard specifies the requirements for the preparation of comparison test pieces for steel plates and pipe fittings, but there is no clear requirement for comparison test pieces under the condition of coexistence of internal and external defects. UTILITY MODEL CONTENT

[0004] In view of the above problems, the utility model aims to overcome the shortcomings of the prior art and designs a magnetic flux leakage detection comparison test block.

[0005] To achieve the above object, the utility model provides the following technical scheme: a magnetic flux leakage detection comparison test block, comprising a test block body used for comparison with a detected pipe fitting in a magnetic flux leakage detection process, the test block body is a cuboid structure, the top and bottom of the test block body are respectively a first machining surface and a second machining surface, a first machining groove group is arranged on the first machining surface, the first machining groove group comprises a plurality of first artificial defects, a second machining groove group is arranged on the second machining surface, the second machining groove group comprises a plurality of second artificial defects, and the first artificial defects and the second artificial defects coincide in the direction perpendicular to the plane where the first machining surface is located.

[0006] As a preferred embodiment of the utility model, the first artificial defect comprises a first defect, a second defect and a third defect, the second artificial defect comprises a fourth defect, a fifth defect and a sixth defect, and the center axes of the first defect, the second defect, the third defect, the fourth defect, the fifth defect and the sixth defect are parallel to each other.

[0007] As a preferred embodiment of the utility model, in the direction perpendicular to the first machining surface, the overlapping area of the first defect and the fourth defect accounts for 70% of the total area of each defect.

[0008] As a preferred embodiment of the utility model, in the direction perpendicular to the first machining surface, the overlapping area of the second defect and the fifth defect accounts for 50% of the total area of each defect.

[0009] As the preferred embodiment of the utility model, in the direction perpendicular to the first processing surface, the coincidence area of the third defect and the sixth defect accounts for 30% of the total area of each.

[0010] As the preferred embodiment of the utility model, the test block body is made of magnetic material.

[0011] As the preferred embodiment of the utility model, the test block body is made of magnetic material.

[0012] As the preferred embodiment of the utility model, the detection groove is a U-shaped groove, the groove bottom of the detection groove is a curved surface that can cooperate with the outer surface of the detected pipe, and the opening width of the detection groove is greater than or equal to the outer diameter of the detected pipe.

[0013] The utility model has the beneficial effects compared with prior art:

[0014] The utility model discloses a first artificial defect and a second artificial defect are overlapped in the direction perpendicular to the first processing surface by a certain proportion, and the inside and outside defects coexist of the detected pipe are successfully simulated.This makes the comparative test block more close to the actual detection environment, and the evaluation accuracy is improved.At the same time, the first artificial defect and the second artificial defect are overlapped in the direction perpendicular to the first processing surface by different proportions, and the inside and outside defects coexist detection requirements of different test block thicknesses, different defect widths and different defect depths can be satisfied.

[0015] The additional aspects and advantages of the utility model will be partly given in the following description, and some will become obvious from the following description or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the utility model will become apparent and more readily understood from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0017] Figure 1 It is a kind of magnetic flux leakage detection comparative test block's three-dimensional structure schematic Figure 1 .

[0018] Figure 2 It is a kind of magnetic flux leakage detection comparative test block's three-dimensional structure schematic Figure 2 .

[0019] Figure 3 It is a kind of magnetic flux leakage detection comparative test block in the structure of first processing surface's plan view.

[0020] Figure 4 It is a kind of magnetic flux leakage detection comparative test block in the structure of second processing surface's plan view.

[0021] Figure 5 is a structural side view of a test block body in a magnetic flux leakage detection comparison test block.

[0022] Reference signs include:

[0023] 1, test block body; 2, first processing surface; 21, first defect; 22, second defect; 23, third defect 3, second processing surface; 31, fourth defect; 32, fifth defect; 33, sixth defect; 4, detection groove. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0025] As Figures 1 to 5 shown, the magnetic flux leakage detection comparison test block of the present application comprises a test block body 1 used for comparison with a detected pipe during the magnetic flux leakage detection process, the test block body 1 is a cuboid structure, the top and bottom of the test block body 1 are respectively a first processing surface 2 and a second processing surface 3, a first processing groove group is arranged on the first processing surface 2, the first processing groove group comprises a plurality of first artificial defects, a second processing groove group is arranged on the second processing surface 3, the second processing groove group comprises a plurality of second artificial defects, and the first artificial defects and the second artificial defects coincide in the direction perpendicular to the plane where the first processing surface 2 is located.

[0026] The present application successfully simulates the coexistence of internal and external defects of the detected pipe by arranging the first processing groove group and the second processing groove group on the top and bottom of the test block body 1 respectively, and making the first artificial defects and the second artificial defects coincide in a certain ratio in the direction perpendicular to the plane where the first processing surface 2 is located. This makes the comparison test block closer to the actual detection environment, and improves the accuracy of evaluation. At the same time, by making the first artificial defects and the second artificial defects coincide in different ratios in the direction perpendicular to the plane where the first processing surface 2 is located, the coexistence detection requirements of internal and external defects of different test block thicknesses, different defect widths and different defect depths can be met.

[0027] Further, reference is made to Figure 3 , Figure 4 and Figure 5As shown, the first artificial defects include a first defect 21, a second defect 22 and a third defect 23, and the second artificial defects include a fourth defect 31, a fifth defect 32 and a sixth defect 33, and the center axes of the first defect 21, the second defect 22, the third defect 23, the fourth defect 31, the fifth defect 32 and the sixth defect 33 are parallel to each other.

[0028] By arranging a plurality of defects, including the first defect 21, the second defect 22, the third defect 23, the fourth defect 31, the fifth defect 32 and the sixth defect 33, on the test block body 1, different shapes and sizes of defects can be simulated, so that the defect conditions of the detected pipe can be more comprehensively evaluated. Such simulation of diversity helps to improve the comprehensiveness and accuracy of evaluation. At the same time, the center axes of the first defect 21, the second defect 22, the third defect 23, the fourth defect 31, the fifth defect 32 and the sixth defect 33 are parallel to each other, which helps to simplify the detection process and reduce the detection difficulty. Because the defects with parallel axes produce more regular and easily identifiable signals during detection, the detection personnel can more accurately determine the position and size of the defects.

[0029] Further, as shown in Figure 3 , Figure 4 and Figure 5 , the length of the test block body 1 is 240 mm, the width is 100 mm, and the thickness is 4 mm. The left end of the first defect 21 is 37.5 mm away from the left end of the contrast test block, the width is 5 mm, and the depth is 1.2 mm. The left side of the second defect 22 is 75 mm away from the right side of the first defect 21, the right side of the second defect 22 is 75 mm away from the left side of the third defect 23, the width is 5 mm, and the depth is 1.2 mm. The right side of the third defect 23 is 37.5 mm away from the right end of the contrast test block, the width is 5 mm, and the depth is 1.2 mm. The second machining surface 3 is determined by flipping the first machining surface 2 upside down from the contrast test block. The left end of the fourth defect 31 is 39 mm away from the left end of the contrast test block, the width is 5 mm, and the depth is 1.2 mm. The left side of the fifth defect 32 is 76 mm away from the right side of the fourth defect 31, the right side of the fifth defect 32 is 76 mm away from the left side of the sixth defect 33, the width is 5 mm, and the depth is 1.2 mm. The right side of the sixth defect 33 is 34 mm away from the right end of the contrast test block 1, the width is 5 mm, and the depth is 1.2 mm. Thus, in the direction perpendicular to the first machining surface 2, the overlapping area of the first defect 21 and the fourth defect 31 accounts for 70% of the total area of each; the overlapping area of the second defect 22 and the fifth defect 32 accounts for 50% of the total area of each; and the overlapping area of the third defect 23 and the sixth defect 33 accounts for 30% of the total area of each.

[0030] Specifically, the positions, widths and depths of the first defect 21, the second defect 22 and the third defect 23 on the first processing surface 2 are precisely designed to ensure that different types of defects can be accurately simulated and evaluated during the detection process. This helps to improve the accuracy and reliability of the detection. At the same time, the positions and sizes of the fourth defect 31, the fifth defect 32 and the sixth defect 33 on the second processing surface 3 are also precisely designed, so that these defects have a certain degree of coincidence with the defects on the first processing surface 2 in a certain direction, further simulating the coexistence of internal and external defects in actual pipe fittings. By controlling the coincidence degree of the first defect 21 and the fourth defect 31, the second defect 22 and the fifth defect 32, and the third defect 23 and the sixth defect 33 in the direction perpendicular to the first processing surface 2, respectively 70%, 50% and 30%, the simulation of defects with different coincidence degrees is realized. This helps detection personnel to better understand the impact of different coincidence degrees on the detection results, thereby improving the accuracy and reliability of the detection results.

[0031] Further, the test block body 1 is made of magnetic material. Magnetic material has high sensitivity to changes in magnetic field, so the test block body 1 made of magnetic material can more accurately simulate the magnetic field changes of the detected pipe fittings during the magnetic flux leakage detection process. This helps detection personnel to more accurately identify and evaluate defect signals, improving the accuracy and reliability of the detection.

[0032] Further, referring to Figure 2 It is shown that the test block body 1 is provided with a detection groove 4 penetrating through the first processing surface 2 and the second processing surface 3, and the detection groove 4 is used to reduce the gap between the test block body 1 and the detected pipe fitting. By the detection groove 4, the test block body 1 can be more closely fitted to the surface of the pipe fitting when placed on the pipe fitting, thereby reducing the gap between the test block body 1 and the detected pipe fitting. The reduction of the gap helps to reduce signal loss and interference during the magnetic flux leakage detection process, making the detection result more accurate and reliable.

[0033] Further, referring to Figure 2 It is shown that the detection groove 4 is a U-shaped groove, the groove bottom of the detection groove 4 is a curved surface that can cooperate with the outer surface of the detected pipe fitting, and the opening width of the detection groove 4 is greater than or equal to the outer diameter of the detected pipe fitting. The structure of the U-shaped groove makes the test block body 1 more closely fit the outer surface of the pipe fitting when placed on the pipe fitting. In particular, the curved groove bottom can form a good fit with the outer surface of the detected pipe fitting, reducing the gap between the test block and the detected pipe fitting, thereby improving the stability and accuracy of the detection. At the same time, since the opening width of the detection groove 4 is greater than or equal to the outer diameter of the detected pipe fitting, the comparative test block can adapt to different sizes of pipe fittings. Whether it is a larger or smaller pipe fitting, it can be conveniently placed in the detection groove 4 for detection, enhancing the versatility and flexibility of the comparative test block.

[0034] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the application can be implemented in other particular forms without departing from the spirit or essential characteristics of the application. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No feature of the application is considered critical unless it is expressly stated in the claims.

Claims

1. A magnetic flux leakage detection comparison test block comprising a test block body (1) for comparison with a pipe under test during magnetic flux leakage detection, characterised in that, The test block body (1) is a cuboid structure, the top and bottom of the test block body (1) are respectively a first processing surface (2) and a second processing surface (3), the first processing surface (2) is provided with a first processing groove group, the first processing groove group includes a plurality of first artificial defects, the second processing surface (3) is provided with a second processing groove group, the second processing groove group includes a plurality of second artificial defects, the first artificial defects and the second artificial defects coincide in the direction perpendicular to the plane where the first processing surface (2) is located.

2. The magnetic flux leakage detection contrast test block of claim 1, wherein, The first artificial defects include a first defect (21), a second defect (22) and a third defect (23), the second artificial defects include a fourth defect (31), a fifth defect (32) and a sixth defect (33), the center axes of the first defect (21), the second defect (22), the third defect (23), the fourth defect (31), the fifth defect (32) and the sixth defect (33) are parallel to each other.

3. The magnetic flux leakage detection contrast test block of claim 2, wherein, In the direction perpendicular to the first processing surface (2), the overlapping area of the first defect (21) and the fourth defect (31) accounts for 70% of the total area of each.

4. The magnetic flux leakage detection contrast test block of claim 2, wherein, In the direction perpendicular to the first processing surface (2), the overlapping area of the second defect (22) and the fifth defect (32) accounts for 50% of the total area of each.

5. The magnetic flux leakage detection contrast test block of claim 2, wherein, In the direction perpendicular to the first processing surface (2), the overlapping area of the third defect (23) and the sixth defect (33) accounts for 30% of the total area of each.

6. The magnetic flux leakage detection contrast test block of claim 1, wherein, The test block body (1) is made of a magnetic material.

7. The magnetic flux leakage detection contrast test block of claim 1, wherein, The test block body (1) is provided with a detection groove (4) penetrating through the first processing surface (2) and the second processing surface (3).

8. The magnetic flux leakage detection contrast test block of claim 7, wherein, The detection groove (4) is a U-shaped groove, the groove bottom of the detection groove (4) is a curved surface that can cooperate with the outer surface of the detected pipe, and the opening width of the groove mouth of the detection groove (4) is greater than or equal to the outer diameter of the detected pipe.

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