A method and tool for controlling imaging of small-diameter tubes

Abstract

The present application relates to a method for controlled imaging of small-diameter pipes, belonging to the field of radiographic nondestructive testing, and includes the following steps: according to the formula g / D0=Tanβ / 2, marking the angular positions corresponding to different values ​​of g / D0 on a right-angled fan-shaped plate, where g is the weld width, D0 is the pipe diameter, and β is the incident angle of the radiograph; placing the pipe to be tested on a film; measuring the weld width of the pipe to be tested and determining the pipe diameter, and finding the corresponding angular position on the right-angled fan-shaped plate; aligning the right-angled side of the right-angled fan-shaped plate with one side of the weld, horizontally moving the radiograph and rotating the radiograph so that the center line of the radiograph's beam is directed to the corresponding angular position on the right-angled fan-shaped plate, pulling the radiograph along the incident direction of the radiograph's beam, and using a measuring tool to determine the radiograph's focal length, elliptical radiography can be performed. The present application has the effect of quickly and accurately adjusting the working position of the radiograph, achieving clear imaging, and reducing the waste rate of filming.

Description

Technical Field

[0001] The present application relates to the technical field of radiographic nondestructive testing, and in particular to a method and tool for controlled imaging of small-diameter tubes. Background Art

[0002] Elliptical radiography is a nondestructive testing technique commonly used to inspect weld quality or detect defects in small-diameter pipes (those with a diameter less than 100 mm). During elliptical radiography, radiation passes through the pipe wall and is projected onto a detector or film. This method is effective for detecting defects such as cracks, porosity, and slag inclusions in pipe welds.

[0003] In elliptical radiography, imaging is generally achieved by using the oblique radiography method in combination with the double-wall single shadow method or the double-wall double shadow method. The key to clear imaging lies in controlling the size of the elliptical imaging opening (the length of the a-axis in the elliptical imaging). The elliptical imaging opening size is usually required to be twice the weld width. The elliptical imaging opening size is related to the offset L0 of the radiography machine (the horizontal distance from the center of the weld line to the center line of the radiation beam) and the incident angle β (the inclination angle of the center line of the radiation beam relative to the longitudinal section of the weld).

[0004] LO can be calculated by the formula: L0=(g+q)[F-(D0+Δh)] / (D0+Δh), where g is the weld width, q is the opening size, F is the focal length, D0 is the pipe diameter, and Δh is the weld reinforcement height;

[0005] β can be calculated by the formula: tanβ=L0 / L, where L is the horizontal distance between the ray source and the center of the weld;

[0006] It can be seen that a large amount of data is difficult to measure and the calculation is complicated. This formula is rarely used in on-site inspections, which leads to the inability to effectively control the opening. On-site inspections only involve horizontal movement and rotation of the X-ray machine based on experience, and the offset and incident angle cannot be accurately controlled. This results in unclear inspection images and a high film rejection rate. Summary of the Invention

[0007] In order to quickly and accurately adjust the working position of the X-ray machine, achieve clear imaging, and reduce the waste rate of film shooting, the present application provides a method and tool for controlling imaging with a small-diameter tube.

[0008] The present application provides a method for controlled imaging of a small-diameter tube using the following technical solutions:

[0009] A method for controlling imaging using a small-diameter tube comprises the following steps:

[0010] According to the formula g / D0=Tanβ / 2, mark the angle positions corresponding to different values ​​of g / D0 on a right-angled sector plate, where g is the weld width, D0 is the pipe diameter, and β is the incident angle of the X-ray machine;

[0011] Place the pipe to be tested on the film;

[0012] Measure the weld width of the pipe to be tested and determine the pipe diameter, and find the corresponding angle position on the right-angle sector plate;

[0013] Align the right-angle side of the right-angle sector plate with one side of the weld, move the X-ray machine horizontally and rotate the X-ray machine so that the center line of the X-ray machine's beam is directed to the corresponding angle position on the right-angle sector plate, pull the X-ray machine along the incident direction of the X-ray machine's beam, and use the measuring tool to determine the focal length of the X-ray machine, then you can perform elliptical radiography.

[0014] By adopting the above technical solution, on-site inspection personnel only need to measure the width of the weld. The pipe diameter is generally determined. Then, the right-angle side of the right-angle sector plate is aligned with the edge of the weld. The X-ray machine is aligned with the corresponding angle position and the focus of the X-ray machine is adjusted to perform radiography.

[0015] This method of controlling imaging reduces computational complexity by simplifying formulas and setting reasonable parameters, thus avoiding errors caused by difficult-to-measure data. This makes on-site operations more reliable and controllable.

[0016] At the same time, after quickly determining the incident angle, this method means that when the X-ray machine is moved horizontally to the corresponding position on the right-angle sector plate, the X-ray machine has actually reached the position where it needs to be laterally offset. The inspection personnel do not need to specifically calculate the offset amount, nor do they need to specifically move the X-ray machine horizontally. They only need to align the X-ray machine with the angle position on the right-angle sector plate. This allows for quick adjustment of the X-ray machine's working position, thereby improving inspection efficiency.

[0017] This control method makes the working position of the X-ray machine more accurate, which can significantly reduce the distortion and error in imaging, ensure that the imaging opening size meets the requirements, effectively reduce the waste rate of film shooting, and improve the detection accuracy of weld defects;

[0018] This control method can adapt to different pipe diameters and weld widths, has strong versatility and flexibility, and is suitable for non-destructive testing scenarios of various small-diameter pipes.

[0019] Optionally, the formula g / D0=Tanβ / 2 is obtained by the formula g / D0=L0 / 2*(F-D0)=Tanβ / 2, where LO is the offset of the X-ray machine and F is the focal length of the X-ray machine.

[0020] Optionally, g / D0=L0 / 2*(F-D0) can be simplified by the formula L0=(g+q)[F-(D0+Δh)] / (D0+Δh), where q is the size of the elliptical imaging opening and Δh is the weld reinforcement.

[0021] The elliptical imaging opening size q is set to twice the weld width g. The weld excess height Δh is small relative to the pipe diameter, so Δh is estimated to be negligible, and the formula is: L0=2g(F-D0) / D0. After changes, we can get g / D0=L0 / 2*(F-D0).

[0022] Optionally, when adjusting the X-ray machine, place the infrared beam lamp at the angle position corresponding to the right-angle sector plate, and then move and rotate the X-ray machine horizontally until the infrared beam lamp is directed to the center of the X-ray machine's radiation source, which means that the X-ray machine has been adjusted.

[0023] By adopting the above technical solution, the infrared beam lamp can assist in making the X-ray machine more quickly align with the corresponding angle position on the right-angle sector plate, making it more convenient for the inspector to accurately adjust the position of the X-ray machine.

[0024] Optionally, after the right-angled side of the right-angled sector plate abuts against one side of the weld, the right-angled sector plate is moved transversely so that the bottom edge of the right-angled sector plate is directly above the central axis of the projection of the pipe to be tested.

[0025] By adopting the above technical solution, with the help of adjusting the bottom edge position of the right-angled sector plate, when the center line of the ray beam of the X-ray machine is directed to the angular position corresponding to the right-angled sector plate, the center line of the ray beam can be made to accurately pass through the center of the weld cross section, and the rays can be evenly distributed over the entire thickness of the weld, ensuring consistent imaging clarity across the entire weld area, reducing image distortion, and optimizing the elliptical radiography effect, thereby more accurately reflecting the internal conditions of the weld.

[0026] This application also provides a method for controlled imaging of a small-diameter tube using the following technical solution:

[0027] A tool for controlled imaging of small-diameter pipes, used to implement the above-mentioned method for controlled imaging of small-diameter pipes, comprising a measuring ruler, the measuring ruler being provided with an arc plate, the arc plate being provided with a first scale of angles corresponding to different g / D0 values, the arc plate being slidably provided with a clamping frame, the clamping frame being provided with a pointer and an infrared beam lamp, the infrared beam lamp radiating in the same direction as the pointer, the measuring ruler being capable of abutting against a side edge of a weld, and at this time, the vertical right-angled side of the arc plate being aligned with the side edge of the weld.

[0028] By adopting the above technical solution, the measured weld width is compared vertically with the pipe diameter value to find the corresponding first scale value on the arc plate, and then the clamping frame is slid so that the pointer points to the corresponding first scale, the infrared beam lamp is turned on, the measuring ruler is abutted against the side of the weld, and the position of the measuring ruler is adjusted horizontally so that the central axis of the infrared beam lamp projection coincides with the central axis of the projection of the workpiece to be measured, and then the center of the radiation source of the X-ray machine is aligned and facing the infrared beam to complete the position adjustment of the X-ray machine. The opening size of the elliptical radiography can be accurately controlled to make the elliptical radiography clear and imaged, making the on-site detection process simpler and more accurate.

[0029] Optionally, the measuring ruler includes a transverse support portion, a measuring groove is provided at the bottom of one end of the transverse support portion, and a second scale for measuring the weld width is provided on the transverse support portion along the length direction of the measuring groove, and the 0 scale line of the second scale is aligned with the vertical right-angle side of the arc plate.

[0030] By adopting the above technical solution, after aligning the 0 scale line of the second scale with the side of the weld, the weld width value can be quickly read out, and at the same time, the vertical right-angled side of the arc plate is also aligned with one side of the weld. No other tools are needed for assistance. The arc plate is also pre-positioned during measurement. It only needs to abut one side of the weld and make fine-tuning lateral movements to quickly complete the positioning of the infrared beam lamp. It integrates measurement and adjustment functions. The inspector only needs one tool to complete multiple tasks, which greatly improves work efficiency.

[0031] Optionally, the measuring ruler further includes a connecting portion, which is connected to the transverse supporting portion; a connecting section is integrally formed at one end of the vertical right-angled side of the arc plate, and the connecting section is connected to the connecting portion.

[0032] Optionally, the central axis of the infrared beam lamp projection coincides with the central axis of the measuring ruler projection.

[0033] By adopting the above technical solution, when the central axis of the measuring ruler is above the projected central axis of the pipe to be measured, the infrared beam lamp is in a centered state, so that the center line of the beam can pass through the center of the weld cross section. Compared with directly observing and adjusting the center position of the infrared beam lamp, this design can more conveniently and accurately determine the center position of the infrared beam lamp by observing and adjusting the measuring ruler.

[0034] Optionally, adjustment frames are provided on both sides of the measuring ruler, the adjustment frames are rotatably connected to adjustment sleeves, the adjustment sleeves are threadedly connected to a measuring rod, the measuring rod is slidingly connected to the adjustment frames, and one end of the measuring rod passes through the adjustment frames, and the measuring rod is provided with a third scale along its length direction.

[0035] By adopting the above technical solution, after the measuring ruler is abutted against the weld, the adjusting sleeves on both sides of the adjusting frame are rotated, the measuring rods are moved and abutted against the pipe to be measured, and are adjusted until the third scale on the measuring rods at both ends is the same as the value relative to one end of the adjusting sleeve, and when the two measuring rods abut against the pipe to be measured at the same time, it means that the measuring ruler is in the center state at this time. Not only can the infrared beam lamp be adjusted to the center position accurately and quickly, but when the infrared beam lamp is adjusted, the two measuring rods cooperate to stably fix the measuring ruler on the pipe to be measured, which is convenient for the inspector to perform subsequent operations, and only one inspector is needed to independently complete the elliptical radiography work of the pipe to be measured.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. This method of controlling imaging reduces computational complexity by simplifying formulas and setting reasonable parameters, thus avoiding errors caused by difficult-to-measure data. This makes on-site operations more reliable and controllable.

[0038] 2. This method quickly determines the incident angle. When the X-ray machine is moved horizontally to the corresponding position on the right-angle sector plate, the X-ray machine has actually reached the position where it needs to be laterally offset. The inspector does not need to specifically calculate the offset amount or precisely move the X-ray machine horizontally. The X-ray machine only needs to be aligned with the angle position on the right-angle sector plate. The working position of the X-ray machine can be quickly adjusted, thereby improving inspection efficiency.

[0039] 3. This control method makes the working position of the X-ray machine more accurate, which can significantly reduce the distortion and error in imaging, ensure that the imaging opening size meets the requirements, effectively reduce the waste rate of film shooting, and improve the detection accuracy of weld defects;

[0040] 4. This control method can adapt to different pipe diameters and weld widths, has strong versatility and flexibility, and is suitable for non-destructive testing scenarios of various small-diameter pipes;

[0041] 5. After aligning the 0 scale line of the second scale with the side of the weld, the weld width value can be quickly read, and at the same time, the vertical right-angled side of the arc plate is also aligned with one side of the weld. No other tools are needed for assistance. The arc plate is also pre-positioned during measurement. It is only necessary to adjust until the third scale on the measuring rods at both ends is the same as the value relative to one end of the adjusting sleeve, and when the two measuring rods are in contact with the pipe to be measured at the same time, it means that the measuring ruler is in the center. Not only can the infrared beam lamp be adjusted to the center position accurately and quickly, but also when the infrared beam lamp is adjusted When testing, the two measuring rods cooperate to fix the measuring ruler stably on the pipe to be tested, and then use the measured weld width to compare it vertically with the pipe diameter value to find the corresponding first scale value on the arc plate, and then slide the clamping frame to make the pointer point to the corresponding first scale, turn on the infrared beam lamp, align the center of the radiation source of the X-ray machine towards the infrared beam, and the position adjustment of the X-ray machine can be completed, which is convenient for the inspection personnel to operate. In addition, only one inspection personnel is needed to independently complete the elliptical radiography work of the pipe to be tested. It integrates measurement and adjustment functions, which greatly improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a state reference diagram used in the oblique penetration method.

[0043] Figure 2 is a diagram showing the angle of incidence.

[0044] Figure 3 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0045] Figure 4 It is a schematic structural diagram of a measuring ruler used in an embodiment of the present application.

[0046] Figure 5 yes Figure 4 Enlarged schematic diagram of part A.

[0047] Figure 6 It is a schematic diagram of the overall structure of Example 2 of the present application.

[0048] Explanation of the accompanying symbols: 1. Measuring ruler; 11. Horizontal supporting part; 111. Measuring groove; 112. Second scale; 12. Connecting part; 2. Arc plate; 21. Connecting section; 22. First scale; 3. Clamping frame; 31. Visual window; 32. Pointer; 4. Infrared beam lamp; 5. Adjusting frame; 51. Adjusting sleeve; 52. Measuring rod; 521. Third scale; 6. X-ray machine. DETAILED DESCRIPTION

[0049] The following is combined with Figure 1-6 This application is described in further detail.

[0050] Example 1

[0051] Example 1 of the present application discloses a method for controlling imaging through a small-diameter tube.

[0052] A method for controlled imaging of a small-diameter tube comprises the following steps:

[0053] S1. According to the formula g / D0=Tanβ / 2, mark the angular positions corresponding to different values ​​of g / D0 on a right-angled sector plate. Use a protractor or sector angle measuring ruler to mark the angular positions corresponding to different values ​​of g / D0 on a right-angled sector plate as follows:

[0054] When g / D0=0.06, the β angle is about 6.87°, and the value of 0.06 is marked on the 6.87° position of the right-angle sector plate;

[0055] When g / D0=0.1, the β angle is about 11.42°, and the value of 0.1 is marked on the 11.42° position of the right-angle sector plate;

[0056] When g / D0=0.15, the β angle is about 17.06°, and the value of 0.15 is marked on the 17.06° position of the right-angle sector plate;

[0057] When g / D0=0.2, the β angle is about 22.62°, and the value of 0.2 is marked on the 22.62° position of the right-angle sector plate;

[0058] When g / D0 = 0.25, the β angle is about 28.07°. The value of 0.25 is marked on the 28.07° position of the right-angle sector plate.

[0059] When g / D0=0.3, the β angle is about 33.40°, and the value of 0.3 is marked on the 33.40° position of the right-angle sector plate;

[0060] When g / D0=0.35, the β angle is about 38.58°, and the value of 0.35 is marked on the 38.58° position of the right-angle sector plate;

[0061] When g / D0 = 0.4, the β angle is about 43.60°, and the value of 0.4 is marked at the 43.60° position on the right-angle sector plate;

[0062] S2. Measure the weld width of the pipe to be tested and determine the pipe diameter, and find the corresponding angle position on the right-angle sector plate;

[0063] S3. Place the pipe to be tested on the film and align the vertical right-angle side of the right-angle sector plate with one side of the weld;

[0064] S4. Move the right-angled set square horizontally so that the central axis of the orthographic projection of the right-angled set square coincides with the central axis of the orthographic projection of the pipe to be measured;

[0065] S5. Place the infrared beam lamp at the angle corresponding to the right-angle sector, and then move and rotate the ray machine 6 horizontally until the infrared beam lamp is directed toward the center of the radiation source of the ray machine 6;

[0066] S6. Use the measuring ruler 1 to determine the focal length of the X-ray machine 6, that is, complete the position adjustment of the X-ray machine 6. At this time, the offset position and incident angle direction of the X-ray machine 6 are adjusted. At the same time, the center line of the X-ray beam of the X-ray machine 6 just passes through the center of the weld cross section, and then elliptical radiography can be started.

[0067] Combine Figure 1 and Figure 2 , g / D0=Tanβ / 2 is derived as follows:

[0068] The X-ray machine 6 offset calculation formula is: L0=(g+q)

F-(D0+Δh)

[0069] L0: offset (horizontal distance from the center of the weld line to the center line of the beam);

[0070] g: weld width;

[0071] q: the size of the elliptical imaging opening (the size of the a-axis of the elliptical imaging);

[0072] F: focal length of the X-ray machine 6;

[0073] D0: diameter of the pipe to be tested;

[0074] Δh: weld reinforcement.

[0075] Simplify the above formula. Since the elliptical imaging opening size is twice the weld width, the imaging is excellent. So let q = g.

[0076] The weld reinforcement Δh is small relative to the pipe diameter, so it is estimated that Δh can be ignored;

[0077] The simplified formula is:

[0078] L0=2g(F-D0) / D0, by changing the equation, we can get g / D0=L0 / 2*(F-D0);

[0079] Combine Figure 2 , we know that L0 / 2*(F-D0)=Tanβ / 2, so we can get g / D0=Tanβ / 2;

[0080] β: angle of incidence (the inclination angle of the center line of the ray beam relative to the longitudinal section of the weld).

[0081] On-site inspection personnel only need to measure the width of the weld. The pipe diameter is generally determined. Then, the right-angle side of the right-angle sector plate is aligned with the edge of the weld. The X-ray machine 6 is aligned with the corresponding angle position. The focal length of the X-ray machine 6 is adjusted to perform transillumination.

[0082] This method of controlling imaging reduces computational complexity by simplifying formulas and setting reasonable parameters, thus avoiding errors caused by difficult-to-measure data. This makes on-site operations more reliable and controllable.

[0083] At the same time, after quickly determining the incident angle, this method means that when the X-ray machine 6 is moved horizontally to align with the corresponding position on the right-angled sector plate, the X-ray machine 6 has actually already reached the position where it needs to be laterally offset. The inspector does not need to specifically calculate the offset amount or precisely move the X-ray machine 6 horizontally. Instead, the inspector only needs to align the X-ray machine 6 with the angular position on the right-angled sector plate. This allows for quick adjustment of the X-ray machine 6's working position, thereby improving inspection efficiency.

[0084] This control method makes the working position of the X-ray machine 6 more accurate, thereby significantly reducing the distortion and error in imaging, ensuring that the imaging opening size meets the requirements, effectively reducing the waste rate of film shooting, and improving the detection accuracy of weld defects;

[0085] This control method can adapt to different pipe diameters and weld widths, has strong versatility and flexibility, and is suitable for non-destructive testing scenarios of various small-diameter pipes.

[0086] Embodiment 1 of the present application further provides a tool for controlled imaging of small-diameter tubes, for implementing the method for controlled imaging of small-diameter tubes in Embodiment 1 of the present application;

[0087] like Figure 3 、 Figure 4 and Figure 5 , a tool for controlling imaging of a small-diameter tube, comprising a measuring ruler 1 and an arc plate 2;

[0088] The measuring ruler 1 includes a transverse support portion 11 and a connecting portion 12. The connecting portion 12 is vertically arranged and is located at one end of the transverse support portion 11. The connecting portion 12 and the transverse support portion 11 are perpendicular to each other and are integrally formed to form an L-shaped ruler. A measuring groove 111 is provided at the bottom of the transverse support portion 11 near one end of the connecting portion 12. The measuring groove 111 is provided along the length direction of the transverse support portion 11. The transverse support portion 11 is engraved with a second scale 112 for measuring the weld width along the length direction of the measuring groove 111, and the word g is engraved on the transverse support portion 11.

[0089] A connecting section 21 is integrally formed at one end of the vertical right-angled side of the arc plate 2. The connecting section 21 is arranged horizontally and fixed to the connecting portion 12. One end of the horizontal right-angled side of the arc plate 2 is fixed to the horizontal support portion 11, and the 0 scale line of the second scale 112 and the vertical right-angled side of the arc plate 2 are located on the same vertical plane.

[0090] The arc plate 2 is engraved with a first scale 22 of angles corresponding to different values ​​of g / D0. The words g / D0 are engraved on the arc plate 2, and the vertical right-angled side of the arc plate 2 is defined as 0°.

[0091] Mark the value 0.06 at the 6.87° position on arc plate 2;

[0092] Mark the value 0.1 at the position of 11.42° on arc plate 2;

[0093] Mark the value 0.15 at the position of 17.06° on arc plate 2;

[0094] Mark the value 0.2 at the position of 22.62° on arc plate 2;

[0095] Mark the value 0.25 at the position of 28.07° on arc plate 2;

[0096] Mark the value 0.3 at the 33.40° position on arc plate 2;

[0097] Mark the value 0.35 at the 38.58° position on arc plate 2;

[0098] The value 0.4 is engraved on the 43.60° position of arc plate 2.

[0099] A clamping frame 3 is sleeved on the arc plate 2. The clamping frame 3 and the arc plate 2 are in sliding cooperation. There is a certain friction between the clamping frame 3 and the arc plate 2, so that the clamping frame 3 can slide along the contour direction of the arc plate 2 and can be positioned at any position on the arc plate 2. The clamping frame 3 is provided with a viewing window 31 for convenient observation of the reading of the first scale 22, and a pointer 32 is formed on the clamping frame 3.

[0100] An infrared beam lamp 4 is fixed to the side of the clamping frame 3 away from its visual window 31 . The direction of the infrared beam lamp 4 is the same as that of the pointer 32 , and the central axis of the orthographic projection of the infrared beam lamp 4 coincides with the central axis of the orthographic projection of the transverse support portion 11 .

[0101] After aligning the 0 scale line of the second scale 112 with the side of the weld, the weld width value g can be quickly read out, and the measured weld width value g is compared with the pipe diameter value D0 of the pipe to be tested, and then the corresponding first scale 22 value on the arc plate 2 is found, and then the clamping frame 3 is slid so that the pointer 32 points to the corresponding first scale 22, and the horizontal support part 11 is fine-tuned and moved horizontally so that the horizontal support part 11 is centered on the top of the pipe to be tested, and the infrared beam lamp 4 is turned on. Then, the center of the source of the X-ray machine 6 is aligned and directed towards the infrared beam to complete the position adjustment of the X-ray machine 6. The opening size of the elliptical radiography can be accurately controlled to make the elliptical radiography clear and imaged, making the on-site detection process simpler and more accurate, integrating measurement and adjustment functions. The inspector only needs one tool to complete multiple tasks, which greatly improves work efficiency.

[0102] Example 2

[0103] Reference Figure 6 , Example 2 of the present application discloses a tool for controlled imaging of a small-diameter tube. This embodiment differs from Example 1 in that an adjustment frame 5 is provided on both sides of the transverse support portion 11. The adjustment frame 5 is rotatably connected to an adjustment sleeve 51. The adjustment sleeve 51 is threadedly connected to a measuring rod 52. The measuring rod 52 is slidably connected to the adjustment frame 5, and one end of the measuring rod 52 passes through the adjustment frame 5. The measuring rod 52 is provided with a third scale 521 along its length.

[0104] The measuring rod 52 is controlled to move laterally by rotating the adjusting sleeve 51. When the third scale 521 on the measuring rods 52 at both ends is adjusted to the same value as the value opposite to one end of the adjusting sleeve 51, and the two measuring rods 52 are simultaneously in contact with the pipe to be tested, it indicates that the transverse support portion 11 is now in a centered state. Not only can the infrared beam lamp 4 be accurately and quickly adjusted to the centered position, but when the infrared beam lamp 4 is adjusted, the two measuring rods 52 cooperate to stably fix the measuring ruler and the arc plate 2 on the pipe to be tested. The measured weld width is then compared vertically with the pipe diameter value to find the corresponding first scale 22 on the arc plate 2. The clamping frame 3 is then slid so that the pointer 32 points to the corresponding first scale 22. The infrared beam lamp 4 is turned on, and the center of the radiation source of the X-ray machine 6 is aligned and facing the infrared beam. The position adjustment of the X-ray machine 6 is completed, which is convenient for the inspector to operate. The X-ray machine 6 integrates the measurement, adjustment and fixing functions in one, and only one inspector is required to independently complete the elliptical radiography of the pipe to be tested.

[0105] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for controlling imaging using a small-diameter tube, characterized in that: The following steps are involved: According to the formula g / D0=Tanβ / 2, mark the angle positions corresponding to different values ​​of g / D0 on a right-angled fan plate, where g is the weld width, D0 is the pipe diameter, and β is the incident angle of the X-ray machine (6); Place the pipe to be tested on the film; Measure the weld width of the pipe to be tested and determine the pipe diameter, and find the corresponding angle position on the right-angle sector plate; Align the right-angle side of the right-angled sector plate with one side of the weld, move the ray machine (6) horizontally and rotate the ray machine (6) so that the center line of the ray beam of the ray machine (6) is directed to the corresponding angle position on the right-angled sector plate, pull the ray machine (6) along the incident direction of the ray beam of the ray machine (6), and determine the focal length of the ray machine (6) with the help of a measuring tool, and then perform elliptical radiography; After the right-angled side of the right-angled sector plate is against one side of the weld, move the right-angled triangle plate horizontally so that the bottom edge of the right-angled triangle plate is directly above the central axis of the projection of the pipe to be tested; The formula g / D0=Tanβ / 2 is obtained by the formula g / D0=L0 / 2*(F-D0)=Tanβ / 2, where L0 is the offset of the ray machine (6) and F is the focal length of the ray machine (6); g / D0=L0 / 2*(F-D0) is simplified by the formula L0=(g+q)[F-(D0+Δh)] / (D0+Δh), where q is the size of the elliptical imaging opening and Δh is the weld reinforcement height; The elliptical imaging opening size q is set to one times the weld width g. The weld reinforcement Δh is relatively small relative to the pipe diameter, so Δh is estimated to be negligible. The formula is: L0=2g(F-D0) / D0. After changing, we can get g / D0=L0 / 2*(F-D0). When adjusting the ray machine (6), place the infrared beam lamp at the angle position corresponding to the right-angle fan, then move and rotate the ray machine (6) until the infrared beam lamp is directed to the center of the radiation source of the ray machine (6), which means that the ray machine (6) has completed the adjustment.

2. A tool for controlled imaging of small-diameter tubes, characterized by: A method for realizing controlled imaging of a small-diameter pipe according to claim 1, comprising a measuring ruler (1), wherein the measuring ruler (1) is provided with an arc plate (2), the arc plate (2) is provided with a first scale (22) of angles corresponding to different values ​​of g / D0, a clamping frame (3) is slidably provided on the arc plate (2), the clamping frame (3) is provided with a pointer (32) and an infrared beam lamp (4), the ray direction of the infrared beam lamp (4) is the same as the direction of the pointer (32), the measuring ruler (1) can abut against the side of the weld, and at this time, the vertical right-angled side of the arc plate (2) is aligned with the side of the weld.

3. The small-diameter tube controlled imaging tool according to claim 2, characterized in that: The measuring ruler (1) comprises a transverse support portion (11), a measuring groove (111) is provided at the bottom of one end of the transverse support portion (11), and a second scale (112) for measuring the width of the weld is provided along the length direction of the measuring groove (111), wherein the zero scale line of the second scale (112) is aligned with the vertical right-angled side of the circular arc plate (2).

4. The small-diameter tube controlled imaging tool according to claim 3, characterized in that: The measuring ruler (1) further comprises a connecting portion (12), wherein the connecting portion (12) is connected to the transverse supporting portion (11); a connecting section (21) is integrally formed at one end of the vertical right-angled side of the arc plate (2), and the connecting section (21) is connected to the connecting portion (12).

5. The small-diameter tube controlled imaging tool according to claim 2, characterized in that: The central axis of the projection of the infrared beam lamp (4) coincides with the central axis of the projection of the measuring ruler (1).

6. The small-diameter tube controlled imaging tool according to claim 5, characterized in that: An adjustment frame (5) is provided on both sides of the measuring ruler (1); the adjustment frame (5) is rotatably connected to an adjustment sleeve (51); the adjustment sleeve (51) is threadedly connected to a measuring rod (52); the measuring rod (52) is slidably connected to the adjustment frame (5), and one end of the measuring rod (52) passes through the adjustment frame (5); and the measuring rod (52) is provided with a third scale (521) along its length direction.

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