Pipeline stress detection and calibration device and method based on ACSM

Abstract

The invention discloses a pipeline stress detection calibration device and method based on ACSM, and relates to the technical field of pipeline stress detection. The device comprises a workbench, a first tension device and a second tension device, the first tension device is connected with the workbench, the first tension device comprises a first connecting part and a second connecting part, and the first connecting part and the second connecting part are connected with the two ends of a first sample plate respectively. The second tension device is connected with the workbench and comprises a third connecting part and a fourth connecting part, the third connecting part is connected with the second sample plate, and the fourth connecting part is connected with the third sample plate. According to the pipeline stress detection calibration device based on the ACSM, the corresponding relation between the detection signal and the pipeline bidirectional coupling stress can be established, and the deviation between the corresponding relation between the detection signal of the ACSM and the pipeline stress and the actual corresponding relation is reduced.

Description

Technical Field

[0001] This application relates to the field of pipeline stress testing technology, and in particular to a pipeline stress testing calibration device and method based on ACSM. Background Technology

[0002] During operation, long-distance oil and gas pipelines in service are subjected to the internal pressure of the medium, resulting in a complex stress state of bidirectional tension in both the circumferential and axial directions. Alternating Current Stress Measurement (ACSM) is a commonly used detection method to identify pipeline stress states, additional loads, and other pipeline failure risks.

[0003] In related technologies, the correspondence between ACSM detection signals and pipeline stress is usually established based on uniaxial tensile conditions. However, actual pipelines are under biaxial coupled stress in both the circumferential and axial directions, and existing detection methods cannot accurately reflect the actual stress state of the pipeline, resulting in a discrepancy between the correspondence between ACSM detection signals and pipeline stress and the actual correspondence. Summary of the Invention

[0004] The purpose of this application is to provide a pipeline stress detection and calibration device and method based on ACSM, which aims to solve the technical problem that the current correspondence between ACSM detection signals and pipeline stress under uniaxial tensile conditions deviates from the actual correspondence.

[0005] In a first aspect, this application provides an ACSM-based pipeline stress testing and calibration device adapted to a cross-shaped template for simulating a pipeline. The cross-shaped template includes a first template, a second template, and a third template. The second template and the third template are disposed opposite each other on both sides of the first template, and the distance between the end of the second template and the end of the third template is less than the length of the first template. The device includes a worktable, a first tension device, a second tension device, and an ACSM detection probe.

[0006] The first tensioning device is connected to the worktable and includes a first connecting part and a second connecting part. The first connecting part and the second connecting part are respectively connected to both ends of the first template, so that the first template is subjected to tension at both ends by the first tensioning device, causing the first template to reach a first preset stress value. The second tensioning device is connected to the worktable and includes a third connecting part and a fourth connecting part. The third connecting part is adapted to connect to the second template, and the fourth connecting part is adapted to connect to the third template, so that the second tensioning device is subjected to tension on the second template and the third template respectively, causing the first template to reach a second preset stress value, and the second preset stress value is not greater than the first preset stress value.

[0007] In the above scheme, the ACSM-based pipeline stress detection and calibration device provided in this application is adapted to a cross-shaped template for simulating a pipeline. It is connected to both ends of the first template through the first and second connecting parts of the first tension device, and connected to the second and third templates through the third and fourth connecting parts of the second tension device. The first and second tension devices apply tension to the first template, the second template, and the third template, respectively, so that the X-axis and Y-axis directions of the cross-shaped template reach the first and second preset stress values, respectively, to simulate the pipeline under bidirectional coupled stress in both circumferential and axial directions. Then, the ACSM detection probe collects the magnetic field disturbance signal caused by the stress change of the first template and outputs the voltage value, thereby establishing the correspondence between the ACSM detection signal and the bidirectional coupled stress of the pipeline, reducing the deviation between the correspondence between the ACSM detection signal and the pipeline stress and the actual correspondence.

[0008] Optionally, the device further includes a first driving device, which is connected to the worktable. The driving end of the first driving device is used to connect to the detection probe of the ACSM, and the first driving device is used to drive the detection probe to move along the length direction of the first template.

[0009] In the above scheme, by setting a first driving device to drive the detection probe to move along the length direction of the first sample plate, continuous detection of the first sample plate along the length direction can be achieved, improving detection efficiency, increasing the consistency of the detection path, and ensuring the continuity and accuracy of the detection data.

[0010] Optionally, the first driving device includes a support frame, a first slide rail, and a first driving component; Both the first slide rail and the first drive member are connected to the worktable via the support frame. The first slide rail is parallel to the first template. The detection probe is slidably engaged with the first slide rail. The first drive member is connected to the detection probe. The first drive member is used to drive the detection probe to move along the extension direction of the first slide rail.

[0011] In the above scheme, the first slide rail and the first driving component are stably installed by the support frame, ensuring that the first slide rail and the first sample plate are arranged in parallel. The parallelism between the first slide rail and the first sample plate allows the detection probe to move along the length of the first sample plate, avoiding detection path deviation and improving detection position accuracy. Furthermore, setting the first slide rail helps to improve the stability of the detection process.

[0012] Optionally, the first driving component includes a first motor, a first screw, and a first slider. The first motor is connected to the support frame, the first screw is parallel to the first slide rail and rotatably connected to the slide rail, the first slider is slidably engaged with the first slide rail, the first screw passes through the first slider and is threadedly connected to the first slider, and the first motor is used to drive the first screw to rotate.

[0013] In the above scheme, the transmission structure of the first screw and the first slider has high precision, smooth movement and accurate positioning, which can realize the feeding and precise positioning of the detection probe, which is beneficial for high-precision point detection of the first sample plate; the threaded transmission has self-locking performance, which can keep the probe position stable during the detection process and improve the reliability of detection.

[0014] Optionally, the first driving component further includes a support arm and a spring. The detection probe is connected to the first slider via the support arm. One end of the spring is connected to the support arm, and the other end of the spring is connected to the detection probe. The spring is used to press the detection probe against the first template.

[0015] In the above scheme, the detection probe is elastically pressed against the surface of the first sample plate by a spring, which can ensure that the detection probe and the first sample plate always maintain a stable detection distance and avoid detection signal fluctuations caused by gap changes; the elastic pressing structure can adapt to the slight undulations of the sample plate surface, improving the stability of the detection signal and the repeatability of the detection results.

[0016] Optionally, the device further includes a first pull rod and a second pull rod. The first pulling device includes a first actuator and a second actuator. The first connecting part and the second connecting part are respectively connected to the first actuator and the second actuator. The first actuator and the second actuator are connected through the first pull rod. The first pull rod is parallel to the first template. The second tensioning device includes a third actuator and a fourth actuator. The third connecting part and the fourth connecting part are respectively connected to the third actuator and the fourth actuator. The third actuator and the fourth actuator are connected by the second pull rod, which is perpendicular to the first template.

[0017] In the above scheme, by setting the first tie rod, a reverse force can be provided to the first and second actuators to play a reverse constraint role. By setting the second tie rod, a reverse force can be provided to the third and fourth actuators to play a reverse constraint role. This ensures that the first, second, third, and fourth actuators can provide stable tension, ensures the accuracy of tension application, and thus increases the accuracy of measurement results.

[0018] Optionally, the device further includes a mounting base connected to the worktable; The first pull rod includes a first rod segment and a second rod segment. One end of the first rod segment is connected to the first actuator, and the other end of the first rod segment is connected to the fixed base. One end of the second rod segment is connected to the second actuator, and the other end of the second rod segment is connected to the fixed base. The second pull rod includes a third rod segment and a fourth rod segment. One end of the third rod segment is connected to the third actuator, and the other end of the third rod segment is connected to the fixed base. One end of the fourth rod segment is connected to the fourth actuator, and the other end of the fourth rod segment is connected to the fixed base.

[0019] In the above scheme, the fixed base provides stable support for each rod segment, making the tension transmission path more reliable and the force more balanced; the multi-segment tie rod structure is easy to assemble and debug, which can reduce the difficulty of processing and installation, while ensuring the accuracy of the tension direction and the stability of the load transmission, avoiding uneven loading or swaying during the loading process.

[0020] Optionally, the first tensioning device includes a first guide and a second guide; the first connecting portion is connected to the worktable via the first guide; the second connecting portion is connected to the worktable via the second guide. The second tensioning device includes a third guide and a fourth guide. The third connecting part is connected to the worktable via the third guide; the fourth connecting part is connected to the worktable via the fourth guide.

[0021] In the above scheme, the motion constraint and guidance of each connection part are achieved by the guide component, which ensures that the tensile force is applied in the predetermined direction, avoids the connection part from deviating, jamming or swinging during the loading process, improves the accuracy and stability of tensile loading, and thus ensures the stability of the sample's stress state during the testing process.

[0022] Optionally, the first connecting part includes a first base plate and a first top plate, and a first clamping space is formed between the first base plate and the first top plate to clamp one end of the first template. The first top plate, the first template and the first base plate are bolted together.

[0023] In the above scheme, the clamping structure of the first base plate and the first top plate is adopted, which is firm and reliable and easy to assemble and disassemble; the bolt connection can provide a stable clamping force, avoid the template from loosening during the tensile loading process, ensure that the tensile force is effectively transferred to the template, and improve the loading reliability.

[0024] Optionally, the second connecting part includes a second bottom plate and a second top plate, and a second clamping space is formed between the second bottom plate and the second top plate to clamp the other end of the first template. The second top plate, the first template and the second bottom plate are bolted together.

[0025] In the above scheme, the clamping structure of the second bottom plate and the second top plate is adopted, which is firm and reliable and easy to assemble and disassemble; the bolt connection can provide a stable clamping force, avoid the template from loosening during the tensile loading process, ensure that the tensile force is effectively transferred to the template, and improve the loading reliability.

[0026] Optionally, the third connecting part includes a third bottom plate and a third top plate, and a third clamping space is formed between the third bottom plate and the third top plate to clamp one end of the second template. The third top plate, the second template and the third bottom plate are bolted together.

[0027] In the above scheme, a clamping structure with a third bottom plate and a third top plate is adopted, which is firm and reliable, and easy to assemble and disassemble; the bolt connection can provide a stable clamping force, prevent the template from loosening during tensile loading, ensure that the tensile force is effectively transferred to the template, and improve the loading reliability.

[0028] Optionally, the fourth connecting part includes a fourth bottom plate and a fourth top plate, and a fourth clamping space is formed between the fourth bottom plate and the fourth top plate to clamp one end of the third template. The fourth top plate, the third template and the fourth bottom plate are bolted together.

[0029] In the above scheme, the clamping structure of the fourth bottom plate and the fourth top plate is adopted, which is firm and reliable and easy to assemble and disassemble; the bolt connection can provide a stable clamping force, avoid the template from loosening during the tensile loading process, ensure that the tensile force is effectively transferred to the template, and improve the loading reliability.

[0030] A second aspect of this application provides a pipeline stress detection and calibration method based on ACSM, used in the aforementioned ACSM-based pipeline stress detection and calibration device, comprising the following steps: The first tensioning device applies tension to both ends of the first cross-shaped template, causing the first template to reach a first preset stress value σ in the X-axis direction.x The second tensioning device applies tension to the second and third templates of the cross pattern, causing the first template to reach a second preset stress value σ in the Y-axis direction. y ; The ACSM detection probe acquires the magnetic field disturbance signal caused by the stress change of the first sample and outputs a voltage U, where σ x With σ y The unit is MPa, and the unit of voltage U is mV; the voltage U and the stress value σ x and σ y The relationship is: U = 10000 + σ x +0.5σ y In the formula, the values ​​on both sides of the equal sign are the corresponding physical quantities.

[0031] It should be noted that the technical effects brought about by the second aspect of this application can be referred to the technical effects brought about by the corresponding implementation of the first aspect, and will not be repeated here. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of a pipeline stress detection and calibration device based on ACSM provided in an embodiment of this application.

[0034] Explanation of reference numerals in the attached figures: 1. Cross template; 11. First template; 12. Second template; 13. Third template; 2. Workbench; 21. Fixed base; 3. First tension device; 31. First connecting part; 32. Second connecting part; 33. First actuator; 34. Second actuator; 35. First guide; 36. Second guide; 4. Second tension device; 41. Third connecting part; 42. Fourth connecting part; 43. Third actuator; 44. Fourth actuator; 45. Third guide; 46. Fourth guide; 5. Detection probe; 6. First drive device; 61. Support frame; 62. First slide rail; 7. Support arm; 8. First pull rod; 81. First rod segment; 82. Second rod segment; 9. Second pull rod; 91. Third rod segment; 92. Fourth rod segment. Detailed Implementation

[0035] In the embodiments of this application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of that feature.

[0036] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0037] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0038] In the embodiments of this application, "parallel," "perpendicular," and "equal" include the described situation and situations similar to the described situation, where the range of similarity is within an acceptable deviation range, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, where the acceptable deviation range for approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, where the acceptable deviation range for approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, where the acceptable deviation range for approximate equality can be, for example, a difference between the two equals being less than or equal to 5% of either one.

[0039] like Figure 1As shown, this application provides an ACSM-based pipeline stress detection and calibration device. This ACSM-based pipeline stress detection and calibration device is adapted to a cross-shaped template 1 used to simulate a pipeline. The cross-shaped template 1 includes a first template 11, a second template 12, and a third template 13. The length direction of the first template 11 is the X-axis direction, and the width direction is the Y-axis direction. The second template 12 and the third template 13 are arranged opposite each other on both sides of the first template 11, and the width of the second template 12 and the third template 13 is the same as the width of the first template 11, making the force application width on the X-axis and Y-axis of the cross-shaped template 1 the same. A square bidirectional tensile region is formed in the middle of the cross-shaped template 1, and the distance between the ends of the second template 12 and the third template 13 is less than the length of the first template 11, making the total X-axis length of the cross-shaped template 1 greater than the total Y-axis length.

[0040] The device includes a worktable 2, a first tension device 3, and a second tension device 4. The first tension device 3 is connected to the worktable 2 and includes a first connecting part 31 and a second connecting part 32. The first connecting part 31 and the second connecting part 32 are respectively connected to both ends of a first sample plate 11 so that the first tension device 3 applies tension to both ends of the first sample plate 11, so that the stress of the first sample plate 11 along the X-axis reaches a first preset stress value. The first preset stress value corresponds to the tension applied by the first tension device 3 to both ends of the first sample plate 11. The first preset stress value is equal to the ratio of the tension of the first tension device 3 to the cross-sectional area of ​​the first sample plate 11 along the tension direction, and the first preset stress value refers to the overall uniform stress value of the first sample plate 11 within the effective test area. The second tension device 4 is connected to the workbench 2. The second tension device 4 includes a third connecting part 41 and a fourth connecting part 42. The third connecting part 41 is adapted to connect to the end of the second template 12 opposite to the third template 13, and the fourth connecting part 42 is adapted to connect to the end of the third template 13 opposite to the second template 12. The second tension device 4 applies tension to the second template 12 and the third template 13 respectively, thereby pulling the square bidirectional tensile area of ​​the first template 11 through the second template 12 and the third template 13, causing the stress of the first template 11 along the Y-axis to reach a second preset stress value. The second preset stress value corresponds to the tension applied by the second tension device 4 to the second template 12 and the third template 13. The second preset stress value is equal to the ratio of the tension applied by the second tension device 4 to the cross-sectional area of ​​the first template 11 along the tension direction, and refers to the overall uniform stress value of the first template 11 within the effective test area. The second preset stress value is not greater than the first preset stress value. The ACSM detection probe 5 acquires the magnetic field disturbance signal caused by the stress change of the first sample plate 11 and outputs a voltage value. That is, the ACSM detection probe 5 acquires the magnetic field disturbance signal, converts the acquired magnetic field disturbance signal into a corresponding electrical signal, processes it, and outputs a voltage value; the voltage value can reflect the internal stress change of the first sample plate 11, thereby realizing the detection of the stress state of the first sample plate 11.

[0041] The ACSM-based pipeline stress detection and calibration device provided in this application is adapted to a cross-shaped template 1 used to simulate a pipeline. It is connected to both ends of the first template 11 via the first connecting part 31 and the second connecting part 32 of the first tension device 3, and connected to the second template 12 and the third template 13 via the third connecting part 41 and the fourth connecting part 42 of the second tension device 4. The first tension device 3 and the second tension device 4 apply tension to the first template 11, the second template 12, and the third template 13, respectively, so that the X-axis and Y-axis directions of the cross-shaped template 1 reach the first preset stress value and the second preset stress value, respectively, to simulate the pipeline under bidirectional coupled stress in the circumferential and axial directions. Then, the ACSM detection probe 5 collects the magnetic field disturbance signal caused by the stress change of the first template 11 and outputs the voltage value, thereby establishing the correspondence between the ACSM detection signal and the bidirectional coupled stress of the pipeline, reducing the deviation between the correspondence between the ACSM detection signal and the pipeline stress and the actual correspondence.

[0042] In some implementations, such as Figure 1 As shown, the ACSM-based pipeline stress detection and calibration device also includes a first drive device 6. The first drive device 6 is connected to the worktable 2. The drive end of the first drive device 6 is used to connect to the ACSM detection probe 5. The first drive device 6 is used to drive the detection probe 5 to move along the length direction of the first sample plate 11, so that the detection probe 5 can continuously detect different positions of the first sample plate 11 along the length direction to obtain the signal amplitude as the target value.

[0043] In this design, by setting the first driving device 6 to drive the detection probe 5 to move along the length direction of the first sample plate 11, continuous detection of the first sample plate 11 along the length direction can be achieved, improving detection efficiency, increasing the consistency of the detection path, and ensuring the continuity and accuracy of the detection data.

[0044] In some implementations, such as Figure 1 As shown, the first driving device 6 includes a support frame 61, a first slide rail 62, and a first driving member; both the first slide rail 62 and the first driving member are connected to the worktable 2 through the support frame 61, and the extension direction of the first slide rail 62 is parallel to the length direction of the first sample plate 11; the detection probe 5 is slidably engaged with the first slide rail 62, and the power output end of the first driving member is connected to the detection probe 5, and the first driving member is used to drive the detection probe 5 to move along the extension direction of the first slide rail 62.

[0045] In this design, the support frame 61 enables the stable installation of the first slide rail 62 and the first driving component, ensuring that the first slide rail 62 and the first sample plate 11 are arranged in parallel. The parallelism between the first slide rail 62 and the first sample plate 11 allows the detection probe 5 to move along the length of the first sample plate 11, avoiding detection path deviation and improving detection position accuracy. Furthermore, the setting of the first slide rail 62 helps to improve the stability of the detection process.

[0046] In some embodiments, the first driving component includes a first motor, a first screw, and a first slider. The first motor is connected to the support frame 61. The first screw is parallel to the first slide rail 62 and rotatably connected to the slide rail. The first slider is slidably engaged with the first slide rail 62. The first screw passes through the first slider and is threadedly connected to the first slider. The first motor is used to drive the first screw to rotate, thereby driving the first slider and the detection probe 5 to move along the first slide rail 62 through threaded transmission.

[0047] Under this design, the transmission structure of the first screw and the first slider has high precision, smooth movement, and accurate positioning, which can realize the feeding and precise positioning of the detection probe 5, which is beneficial for high-precision point detection of the first sample plate 11; the threaded transmission has self-locking performance, which can keep the probe position stable during the detection process and improve the reliability of the detection.

[0048] In some implementations, such as Figure 1 As shown, the first driving component also includes a support arm 7 and a spring. The detection probe 5 is connected to the first slider through the support arm 7. One end of the spring is connected to the support arm 7, and the other end of the spring is connected to the detection probe 5. The spring is in a pre-compressed state and is used to press the detection probe 5 against the first sample plate 11.

[0049] In this design, the detection probe 5 is elastically pressed against the surface of the first sample plate 11 by a spring, which can ensure that the detection probe 5 and the first sample plate 11 always maintain a stable detection distance and avoid fluctuations in the detection signal due to changes in the gap; the elastic pressing structure can adapt to the slight undulations of the sample plate surface, improving the stability of the detection signal and the repeatability of the detection results.

[0050] In some implementations, such as Figure 1As shown, the device also includes a first pull rod 8 and a second pull rod 9. The first pulling device 3 includes a first actuator 33 and a second actuator 34. A first connecting part 31 and a second connecting part 32 are respectively connected to the first actuator 33 and the second actuator 34, so as to apply a pulling force to the first connecting part 31 and the second connecting part 32 through the first actuator 33 and the second actuator 34, and then apply a pulling force to both ends of the first sample plate 11 through the first connecting part 31 and the second connecting part 32. The first actuator 33 and the second actuator 34 are connected by the first pull rod 8. The first pull rod 8 is parallel to the first sample plate 11, that is, the housings of the first actuator 33 and the second actuator 34 are connected by the first pull rod 8.

[0051] The second pulling device 4 includes a third actuator 43 and a fourth actuator 44. A third connecting portion 41 and a fourth connecting portion 42 are respectively connected to the third actuator 43 and the fourth actuator 44, so that the third actuator 43 and the fourth actuator 44 respectively apply pulling force to the third connecting portion 41 and the fourth connecting portion 42, thereby applying pulling force to the second template 12 and the third template 13 through the third connecting portion 41 and the fourth connecting portion 42. The third actuator 43 and the fourth actuator 44 are connected by a second pull rod 9, which is perpendicular to the first template 11. That is, the housings of the third actuator 43 and the fourth actuator 44 are connected by a first pull rod 8.

[0052] In this design, the first pull rod 8 provides a reverse force to the first actuator 33 and the second actuator 34 to achieve a reverse constraint, and the second pull rod 9 provides a reverse force to the third actuator 43 and the fourth actuator 44 to achieve a reverse constraint. This ensures that the first actuator 33, the second actuator 34, the third actuator 43, and the fourth actuator 44 can provide stable tension, ensuring the accuracy of tension application and thus increasing the accuracy of the measurement results.

[0053] In some implementations, reference continues. Figure 1 The device also includes a fixed base 21, which is connected to the worktable 2. The first pull rod 8 includes a first segment 81 and a second segment 82. One end of the first segment 81 is connected to the first actuator 33, and the other end is connected to the fixed base 21. One end of the second segment 82 is connected to the second actuator 34, and the other end is connected to the fixed base 21. The second pull rod 9 includes a third segment 91 and a fourth segment 92. One end of the third segment 91 is connected to the third actuator 43, and the other end is connected to the fixed base 21. One end of the fourth segment 92 is connected to the fourth actuator 44, and the other end is connected to the fixed base 21.

[0054] In this design, the fixed seat 21 provides stable support for each rod segment, making the tension transmission path more reliable and the force more balanced; the multi-segment tie rod structure is easy to assemble and debug, which can reduce the difficulty of processing and installation, while ensuring the accuracy of the tension direction and the stability of the load transmission, avoiding uneven loading or swaying during the loading process.

[0055] In some examples, the first actuator 33, the second actuator 34, the third actuator 43, and the fourth actuator 44 are all electrically operated loading actuators. Their structure includes a cylinder, a drive motor, a lead screw, a loading push rod, and a displacement sensor. The cylinder is fixedly mounted on the worktable 2. The drive motor is located at one end of the cylinder. The lead screw is located inside the cylinder and connected to the output end of the drive motor. The loading push rod is threaded onto the lead screw and can move axially relative to the cylinder, while being circumferentially limited by the cylinder. The protruding end of the loading push rod is connected to a corresponding connecting part. The displacement sensor is located inside the cylinder and is used to detect the displacement information of the loading push rod to achieve precise control of the tensile loading stroke.

[0056] During operation, after receiving the tension loading command from the controller, the actuator starts the drive motor, which then outputs torque, causing the transmission screw connected to its output end inside the cylinder to rotate around its own axis. At this time, the loading push rod, due to its threaded engagement with the transmission screw and its circumferential limitation by the cylinder, cannot rotate synchronously with the transmission screw, thus converting the rotational motion of the transmission screw into its own axial linear motion.

[0057] It is understandable that the first actuator 33, the second actuator 34, the third actuator 43 and the fourth actuator 44 may also be hydraulic actuators or pneumatic actuators, without restriction.

[0058] In some embodiments, the first tension device 3 includes a first guide 35 and a second guide 36; the first connecting part 31 is connected to the worktable 2 through the first guide 35; the second connecting part 32 is connected to the worktable 2 through the second guide 36; the second tension device 4 includes a third guide 45 and a fourth guide 46, the third connecting part 41 is connected to the worktable 2 through the third guide 45; and the fourth connecting part 42 is connected to the worktable 2 through the fourth guide 46.

[0059] In this design, the motion of each connection is constrained and guided by the guide component, ensuring that the tensile force is applied in the predetermined direction. This prevents the connection from shifting, jamming, or swaying during loading, improving the accuracy and stability of tensile loading, and thus ensuring the stability of the sample's stress state during the testing process.

[0060] In some examples, the first guide member 35 includes a first guide rail, which is connected to the worktable 2 and is parallel to the length direction of the first sample plate 11. The bottom of the first connecting part 31 is provided with a first sliding seat, which is slidably engaged with the first guide rail.

[0061] In some examples, the second guide member 36 includes a second guide rail connected to the worktable 2 and parallel to the length direction of the first sample plate 11. The bottom of the second connecting part 32 is provided with a second sliding seat, which slides in cooperation with the second guide rail.

[0062] In some examples, the third guide 45 includes a third guide rail connected to the worktable 2 and perpendicular to the length direction of the third template 13. The bottom of the third connecting part 41 is provided with a third sliding seat, which slides in cooperation with the third guide rail.

[0063] In some examples, the fourth guide member 46 includes a fourth guide rail connected to the worktable 2 and perpendicular to the length direction of the fourth template. The bottom of the fourth connecting part 42 is provided with a fourth sliding seat, which slides in cooperation with the fourth guide rail.

[0064] In some embodiments, the first connecting portion 31 includes a first base plate and a first top plate, forming a first clamping space between the first base plate and the first top plate suitable for clamping one end of the first sample plate 11. The first top plate, the first sample plate 11, and the first base plate are bolted together. The first base plate is connected to the drive end of the first actuator 33, and the first top plate is movably connected to the first base plate. When the first top plate and the first base plate are engaged, they form the first clamping space for inserting the end of the first sample plate 11. The first top plate has a through hole, and the first sample plate 11 has a corresponding through hole. The first base plate has a threaded hole. Bolts pass sequentially through the through holes on the first top plate and the first sample plate 11 and are screwed into the threaded holes on the first base plate, thus achieving the bolted connection of the first top plate, the first sample plate 11, and the first base plate.

[0065] In this design, a clamping structure using a first base plate and a first top plate is adopted, which ensures firm and reliable clamping and convenient assembly and disassembly; the bolt connection provides stable clamping force, prevents the template from loosening during tensile loading, ensures that the tensile force is effectively transferred to the template, and improves loading reliability.

[0066] In some embodiments, the second connecting portion 32 includes a second base plate and a second top plate, forming a second clamping space between the second base plate and the second top plate suitable for clamping the other end of the first template 11. The second top plate, the first template 11, and the second base plate are bolted together. The second base plate is connected to the drive end of the second actuator 34, and the second top plate is movably connected to the second base plate. When the second top plate and the second base plate are engaged, they form a second clamping space for inserting the end of the first template 11. The second top plate has a through hole, and the second template 12 has a corresponding through hole. The second base plate has a threaded hole. Bolts pass sequentially through the through holes on the second top plate and the second template 12, and are screwed into the threaded holes on the second base plate, thus achieving a bolted connection between the second top plate, the second template 12, and the second base plate.

[0067] This design employs a clamping structure with a second base plate and a second top plate, ensuring secure and reliable clamping while facilitating easy assembly and disassembly. Bolted connections provide stable clamping force, preventing the template from loosening during tensile loading and ensuring that the tensile force is effectively transferred to the template, thus improving loading reliability.

[0068] In some embodiments, the third connecting part 41 includes a third base plate and a third top plate, forming a third clamping space between the third base plate and the third top plate suitable for clamping one end of the second template 12. The third top plate, the second template 12, and the third base plate are bolted together. The third base plate is connected to the drive end of the third actuator 43, and the third top plate is movably connected to the third base plate. When the third top plate and the third base plate are engaged, they form a third clamping space for inserting the end of the second template 12. The third top plate has a through hole, and the third template 13 has a corresponding through hole. The third base plate has a threaded hole. Bolts pass sequentially through the through holes on the third top plate and the third template 13, and are screwed into the threaded holes on the third base plate, thus achieving a bolted connection between the third top plate, the third template 13, and the third base plate.

[0069] This design employs a clamping structure with a third base plate and a third top plate, ensuring secure and reliable clamping while facilitating easy assembly and disassembly. Bolted connections provide stable clamping force, preventing the template from loosening during tensile loading and ensuring effective transfer of tensile force to the template, thus improving loading reliability.

[0070] In some embodiments, the fourth connecting part 42 includes a fourth base plate and a fourth top plate, forming a fourth clamping space between the fourth base plate and the fourth top plate suitable for clamping one end of the third template 13. The fourth top plate, the third template 13, and the fourth base plate are bolted together. The fourth base plate is connected to the drive end of the fourth actuator 44, and the fourth top plate is movably connected to the fourth base plate. When the fourth top plate and the fourth base plate are engaged, they form a fourth clamping space for inserting the end of the third template 13. The fourth top plate has a through hole, and the fourth template has a corresponding through hole. The fourth base plate has a threaded hole. Bolts pass sequentially through the through holes in the fourth top plate and the fourth template and are screwed into the threaded holes in the fourth base plate, thus achieving a bolted connection between the fourth top plate, the fourth template, and the fourth base plate.

[0071] This design employs a clamping structure with a fourth base plate and a fourth top plate, ensuring secure and reliable clamping while facilitating easy assembly and disassembly. Bolted connections provide stable clamping force, preventing the template from loosening during tensile loading and ensuring effective transfer of tensile force to the template, thus improving loading reliability.

[0072] In some embodiments, the ACSM-based pipeline stress testing and calibration device further includes a display module and a controller. The controller is electrically connected to the testing probe 5 and the display module, respectively. The controller is used to receive the voltage value output by the testing probe 5, process the signal, and output it to the display module for real-time display. The display module may be a display screen or the like.

[0073] In some examples, the ACSM-based pipe stress testing and calibration device also includes a data acquisition module, which is electrically connected to the controller and the test probe 5, and can be used to acquire and store data.

[0074] In this design, the controller realizes the acquisition, processing and output of detection signals, and the display module can intuitively display the voltage value, which is convenient for operators to observe and record in real time, improves the visualization and ease of use of the device, and is conducive to the real-time monitoring and analysis of detection data.

[0075] This application also provides a pipeline stress detection calibration method based on ACSM, which is used in the aforementioned ACSM-based pipeline stress detection calibration device. The ACSM-based pipeline stress detection calibration method includes the following steps: The cross-shaped specimen is placed on the workbench 2, its position is adjusted, and it is connected to the first connecting part 31, the second connecting part 32, the third connecting part 41, and the fourth connecting part 42 using bolts. The loading force values ​​of the first actuator 33, the second actuator 34, the third actuator 43, and the fourth actuator 44 are set to zero. The maximum test force of the first actuator 33, the second actuator 34, the third actuator 43, and the fourth actuator 44 is 600 kN, with a test force error of ±0.5%. The stroke of the first connecting part 31, the second connecting part 32, the third connecting part 41, and the fourth connecting part 42 is 400 mm, with a displacement resolution of 0.3 μm. In some examples, the nominal yield strength of the cross-shaped specimen 1 is 250 MPa, and the length of the first specimen 11 of the cross-shaped specimen 1 is 200 cm, the width is 40 cm, and the thickness is 5 mm.

[0076] Connect the detection probe 5 to the support arm 7, and then connect the support arm 7 to the first slider. Adjust the fixed position and angle of the support arm 7 to ensure that the forward direction of the detection probe 5 is parallel to the length direction of the first sample plate 11, and that the clamping force is consistent with the detection conditions inside the pipeline. Set the stroke and running speed of the first slider through the controller, thereby configuring the stroke and running speed of the detection probe 5. Connect the detection probe 5 to the data acquisition module, and connect the data acquisition module to the display. Test run the device; the display shows the voltage value output by the detection probe 5. Adjust the first slide rail 62 and the support arm 7 until the real-time signal data output by the detection probe 5 is normal. Adjust the first slide rail 62 to the starting position of the operation, preparing for the dynamic test of the ACSM detection probe 5. In some examples, the first slide rail 62 is 2000mm long, the running speed is set to 0.1m / s, and the signal acquisition frequency is 100Hz.

[0077] The first tensioning device 3 applies tension to both ends of the first template 11 of the cross template 1, causing the first template 11 to reach a first preset stress value σ in the X-axis direction. x The second tension device 4 applies tension to the second template 12 and the third template 13 of the cross template 1, causing the first template 11 to reach the second preset stress value σ in the Y-axis direction. y .

[0078] In some examples, the first actuator 33 and the second actuator 34 in the first tension device 3 are linked, and a tensile stress in the X-axis direction is applied to a preset first preset stress value σ. x After the loading in the X-axis direction is stable, the third actuator 43 and the fourth actuator 44 of the second tension device 4 are linked together to apply tensile stress in the Y direction to the preset second preset stress value σ. y Among them, σ x With σ yThe unit is MPa. The stress levels in the X-axis direction are set to 20%, 40%, 60% and 80% of the nominal yield strength of the template material, respectively. The stress levels in the Y-axis direction, without exceeding the stress levels in the X-axis direction, are increased sequentially according to 20%, 40%, 60% and 80% of the nominal yield strength of the material.

[0079] In some examples, after each stress loading in the X and Y directions has stabilized, the first motor is started, and the first slider drives the detection probe 5 to scan along the X-axis, collecting and storing the scan data of the detection probe 5. The detection probe 5 returns to the starting point, and this process is repeated until all predetermined stress load conditions in the X and Y directions are completed.

[0080] After scanning each stress load condition in the X-axis and Y-axis directions, record the signal amplitude and range of change of the detection probe 5 before and after passing through the bidirectional stress region, and establish a correspondence between the signal amplitude and range of change of the probe and the stress levels in the X-axis and Y-axis directions. Repeat this step until the correspondence between the ACSM signal amplitude and range of change of all predetermined stress load conditions in the X-axis and Y-axis directions is established, thus completing the calibration of the bidirectional stress level of the ACSM.

[0081] In some specific examples, the stress level load steps in the X-axis direction are set to 50 MPa, 100 MPa, 150 MPa, and 200 MPa, and the stress level load steps in the Y-axis direction are also set to 50 MPa, 100 MPa, 150 MPa, and 200 MPa. In each load step, the stress in the Y-axis direction does not exceed the stress in the X-axis direction. Under various bidirectional stress levels, the changes in signal values ​​acquired by the detection probe 5 are recorded. The amplitude of the signal value in each recording area is detailed in Table 1. Table 1 shows the changes in signal values ​​collected by probe 5 under bidirectional stress conditions. The signals are voltage signals, and the unit is mV.

[0082]

[0083] Table 1 Table 1 shows that the ACSM detection probe 5 acquires the magnetic field disturbance signal caused by the stress change of the first sample plate 11 and outputs a voltage U, the unit of which is mV; the voltage U is related to the stress value σ. x and σ y The relationship is: U = 10000 + σ x +0.5σ y In the formula, the values ​​on both sides of the equal sign are the values ​​of the corresponding physical quantities, that is: the value of voltage U = 10000 + the value of σx + 0.5 × σy.

[0084] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0085] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A pipeline stress detection calibration device based on ACSM, adapted to a cross template (1) for simulating pipelines, the cross template (1) comprising a first template (11), a second template (12) and a third template (13), the second template (12) and the third template (13) being disposed opposite to each other on both sides of the first template (11), and the distance between the end of the second template (12) and the end of the third template (13) being less than the length of the first template (11), characterized in that, The device includes: Workbench (2); The first tension device (3) is connected to the workbench (2). The first tension device (3) includes a first connecting part (31) and a second connecting part (32). The first connecting part (31) and the second connecting part (32) are respectively connected to the two ends of the first template (11) so that the first tension device (3) applies tension to the two ends of the first template (11) so that the first template (11) reaches the first preset stress value. The second tension device (4) is connected to the workbench (2). The second tension device (4) includes a third connecting part (41) and a fourth connecting part (42). The third connecting part (41) is adapted to be connected to the second template (12), and the fourth connecting part (42) is adapted to be connected to the third template (13). The second tension device (4) applies tension to the second template (12) and the third template (13) respectively, so that the first template (11) reaches a second preset stress value, and the second preset stress value is not greater than the first preset stress value.

2. The pipeline stress detection and calibration device based on ACSM according to claim 1, characterized in that, The device further includes a first driving device (6), which is connected to the worktable (2). The driving end of the first driving device (6) is used to connect to the detection probe (5) of the ACSM. The first driving device (6) is used to drive the detection probe (5) to move along the length direction of the first template (11).

3. The pipeline stress detection and calibration device based on ACSM according to claim 2, characterized in that, The first driving device (6) includes a support frame (61), a first slide rail (62), and a first driving component; The first slide rail (62) and the first drive member are both connected to the worktable (2) through the support frame (61). The first slide rail (62) is parallel to the first template (11). The detection probe (5) is slidably engaged with the first slide rail (62). The first drive member is connected to the detection probe (5). The first drive member is used to drive the detection probe (5) to move along the extension direction of the first slide rail (62).

4. The pipeline stress detection and calibration device based on ACSM according to claim 3, characterized in that, The first driving component includes a first motor, a first screw and a first slider. The first motor is connected to the support frame (61). The first screw is parallel to the first slide rail (62) and rotatably connected to the slide rail. The first slider is slidably engaged with the first slide rail (62). The first screw passes through the first slider and is threadedly connected to the first slider. The first motor is used to drive the first screw to rotate.

5. The pipeline stress detection and calibration device based on ACSM according to claim 4, characterized in that, The first driving component also includes a support arm (7) and a spring. The detection probe (5) is connected to the first slider through the support arm (7). One end of the spring is connected to the support arm (7), and the other end of the spring is connected to the detection probe (5). The spring is used to press the detection probe (5) against the first template (11).

6. The pipeline stress detection and calibration device based on ACSM according to any one of claims 1-5, characterized in that, The device further includes a first pull rod (8) and a second pull rod (9). The first pulling device (3) includes a first actuator (33) and a second actuator (34). The first connecting part (31) and the second connecting part (32) are respectively connected to the first actuator (33) and the second actuator (34). The first actuator (33) and the second actuator (34) are connected by the first pull rod (8). The first pull rod (8) is parallel to the first template (11). The second pulling device (4) includes a third actuator (43) and a fourth actuator (44). The third connecting part (41) and the fourth connecting part (42) are respectively connected to the third actuator (43) and the fourth actuator (44). The third actuator (43) and the fourth actuator (44) are connected by the second pull rod (9). The second pull rod (9) is perpendicular to the first template (11).

7. The pipeline stress detection and calibration device based on ACSM according to claim 6, characterized in that, The device also includes a fixed base (21) which is connected to the worktable (2); The first pull rod (8) includes a first rod segment (81) and a second rod segment (82). One end of the first rod segment (81) is connected to the first actuator (33), and the other end of the first rod segment (81) is connected to the fixed seat (21). One end of the second rod segment (82) is connected to the second actuator (34), and the other end of the second rod segment (82) is connected to the fixed seat (21). The second pull rod (9) includes a third rod segment (91) and a fourth rod segment (92). One end of the third rod segment (91) is connected to the third actuator (43), and the other end of the third rod segment (91) is connected to the fixed seat (21). One end of the fourth rod segment (92) is connected to the fourth actuator (44), and the other end of the fourth rod segment (92) is connected to the fixed seat (21).

8. The pipeline stress detection and calibration device based on ACSM according to any one of claims 1-5, characterized in that, The first tension device (3) includes a first guide (35) and a second guide (36); the first connecting part (31) is connected to the worktable (2) through the first guide (35); the second connecting part (32) is connected to the worktable (2) through the second guide (36); The second tension device (4) includes a third guide (45) and a fourth guide (46). The third connecting part (41) is connected to the worktable (2) through the third guide (45); the fourth connecting part (42) is connected to the worktable (2) through the fourth guide (46).

9. The pipeline stress detection and calibration device based on ACSM according to any one of claims 1-5, characterized in that, The first connecting part (31) includes a first bottom plate and a first top plate. A first clamping space is formed between the first bottom plate and the first top plate to clamp one end of the first template (11). The first top plate, the first template (11) and the first bottom plate are bolted together. And / or, the second connecting part (32) includes a second bottom plate and a second top plate, a second clamping space is formed between the second bottom plate and the second top plate to clamp the other end of the first template (11), and the second top plate, the first template (11) and the second bottom plate are bolted together; And / or, the third connecting part (41) includes a third bottom plate and a third top plate, a third clamping space is formed between the third bottom plate and the third top plate to clamp one end of the second template (12), and the third top plate, the second template (12) and the third bottom plate are bolted together; And / or, the fourth connecting part (42) includes a fourth bottom plate and a fourth top plate, and a fourth clamping space is formed between the fourth bottom plate and the fourth top plate to clamp one end of the third template (13), and the fourth top plate, the third template (13) and the fourth bottom plate are bolted together.

10. A pipeline stress detection and calibration method based on ACSM, used in the pipeline stress detection and calibration device based on ACSM as described in any one of claims 1-9, characterized in that, Includes the following steps: The first tensioning device (3) applies tension to both ends of the first template (11) of the cross template (1), causing the first template (11) to reach the first preset stress value σ in the X-axis direction. x The second tensioning device (4) applies tension to the second template (12) and the third template (13) of the cross template (1), causing the first template (11) to reach the second preset stress value σ in the Y-axis direction. y ; The ACSM detection probe (5) acquires the magnetic field disturbance signal caused by the stress change of the first sample (11) and outputs a voltage U, where σ x With σ y The unit is MPa, and the unit of voltage U is mV; the voltage U is related to the stress value σ. x and σ y The relationship is: U = 10000 + σ x +0.5σ y In the formula, the values ​​on both sides of the equal sign are the corresponding physical quantities.

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