Supporting device for small-diameter tube radiographic inspection

Abstract

The utility model provides a supporting device for small-diameter tube radiographic inspection, and relates to the technical field of pipeline inspection. The supporting device comprises a first supporting assembly, a second supporting assembly and a supporting leg assembly. The supporting leg assembly is provided with focal length scales, the focal length scales comprise an initial scale mark and a plurality of rear scale marks behind the initial scale mark, and the first supporting assembly is fixed to the supporting leg assembly and corresponds to the initial scale mark of the focal length scales. The second supporting assembly can be detachably connected to any position of the supporting leg assembly and corresponds to any rear scale mark. Each rear scale mark indicates the focal length between the ray machine or the film on the first supporting assembly and the film or the ray machine on the second supporting assembly at the rear scale mark. According to the supporting device for small-diameter tube radiographic inspection, the second supporting assembly can be rapidly adjusted in place through combination of the focal length scales and the selected focal length, so that the focal length between a film and a radiographic machine meets the requirement, repeated manual measurement is not needed, and the detection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline detection, in particular to a supporting device for small-diameter pipe ray detection. Background Art

[0002] Small diameter pipe refers to a pipe with an outer diameter not exceeding 100 mm. When inspecting the butt weld of a small diameter pipe, an existing inspection method is to use an X-ray machine to perform oblique transillumination elliptical imaging on the small diameter pipe, and then judge the imaging of the small diameter pipe to detect its butt quality.

[0003] During the X-ray detection process, the X-ray machine, small-diameter tube and film are usually placed on the bracket respectively, with the X-ray machine located above the small-diameter tube and the film attached to the bottom of the small-diameter tube. At the same time, the focus of the X-ray machine source must be deviated from the center plane of the weld by a certain distance so that the X-ray machine can perform oblique penetration of the small-diameter tube.

[0004] However, the existing bracket for supporting the X-ray machine and the small-diameter tube is fixed and is only suitable for the case where the focal length of the penetration is 700mm. When the focal length of 700mm cannot be used for X-ray detection, auxiliary means are needed to change the focal length, such as placing an auxiliary support device under the pipe weld and the film to reduce the focal length, or placing an auxiliary support device under the X-ray machine to increase the focal length.

[0005] The above-mentioned focal length adjustment method is not only complicated to operate, but also requires manual repeated measurement after adjustment to confirm the accuracy of the focal length, resulting in low detection efficiency. Utility Model Content

[0006] The purpose of the utility model is to provide a supporting device for X-ray detection of small-diameter tubes, so as to alleviate the problem in the prior art that when performing X-ray detection on small-diameter tubes, the bracket used to support the X-ray machine and the small-diameter tube is fixed, which is only applicable to the case where the focal length of the transillumination is 700mm. When the focal length needs to be adjusted, an auxiliary supporting device needs to be placed under the pipe weld and the film, or under the X-ray machine. Not only is the operation more cumbersome, but also manual repeated measurements are required after adjustment to confirm the accuracy of the focal length, resulting in a technical problem of low detection efficiency.

[0007] In a first aspect, the utility model provides a support device for small-diameter tube ray detection, comprising a first support assembly, a second support assembly and a leg assembly;

[0008] One of the first supporting assembly and the second supporting assembly is used to support the X-ray machine, and the other is used to support the pipe to be tested and the film;

[0009] The leg assembly is provided with a focal length scale extending along the length direction thereof, the focal length scale includes a starting scale mark and a plurality of rear scale marks located behind the focal length scale, the first support assembly is fixed to the leg assembly and corresponds to the starting scale mark of the focal length scale, and the second support assembly can be detachably connected to any position of the leg assembly and corresponds to any rear scale mark of the focal length scale;

[0010] Each rear scale mark of the focal length scale indicates the focal length between the X-ray machine or film on the first supporting assembly and the film or X-ray machine on the second supporting assembly at the rear scale mark.

[0011] In an optional embodiment, a position of the leg assembly corresponding to each of the rear scale marks is provided with a limiting portion, and the second support assembly can be fixed at any of the rear scale marks through the limiting portion.

[0012] In an optional embodiment, the limiting portion is a slot.

[0013] In an optional embodiment, the second support assembly includes a support frame and a support plate, the support frame can be connected to any rear scale mark of the leg assembly, and the support plate is installed on the support frame to support the pipe and film to be tested.

[0014] In an optional embodiment, the support plate is slidably connected to the support frame along the eccentricity direction between the focus of the radiation source of the radiation machine on the first support assembly and the weld of the pipe to be tested on the support plate.

[0015] In an optional embodiment, an indicator mark is provided at a position of the support plate corresponding to the focus of the radiation source of the radiation machine on the first support assembly, and the indicator mark is used to coincide with the projection of the weld of the pipe to be tested on the support plate when the pipe to be tested is supported on the support plate.

[0016] In an optional embodiment, the support frame is provided with an eccentricity scale extending along the sliding direction of the support plate, and the indicator mark on the support plate is used to correspond to any scale mark in the eccentricity scale after the support plate slides;

[0017] Each scale mark in the eccentricity scale indicates the eccentricity between the focus of the radiation source of the radiation machine on the first supporting assembly and the scale mark.

[0018] In an optional embodiment, a slide groove is provided on the support frame, and the support plate is slidably connected in the slide groove.

[0019] In an optional embodiment, the first support assembly is an annular support frame, and the support frame is used to accommodate the X-ray machine.

[0020] In an optional embodiment, the leg assembly includes a plurality of legs, and the plurality of legs are spaced apart circumferentially along the first support assembly, each of the legs is provided with the focal length scale, and the same scale marks in the focal length scales of the plurality of legs are located on the same horizontal plane.

[0021] The utility model provides a supporting device for X-ray detection of small-diameter tubes, comprising a first supporting assembly, a second supporting assembly and a leg assembly; one of the first supporting assembly and the second supporting assembly is used to support a X-ray machine, and the other is used to support a pipe to be tested and a film; the leg assembly is provided with a focal length scale extending along its length direction, the focal length scale comprising a starting scale mark and a plurality of rear scale marks located behind it, the first supporting assembly is fixed to the leg assembly and corresponds to the starting scale mark of the focal length scale, the second supporting assembly can be detachably connected to any position of the leg assembly and corresponds to any rear scale mark of the focal length scale; each rear scale mark of the focal length scale indicates the focal length between the X-ray machine or film on the first supporting assembly and the film or X-ray machine on the second supporting assembly at the rear scale mark. During use, the first support assembly can be first fixed to the leg assembly, and the position of the first support assembly on the leg assembly can be made to correspond to the starting scale mark of the focal length scale. Then, the focal length can be selected according to the specifications of the pipe to be tested. Based on the focal length, the second support assembly can be fixed to the leg assembly, and the position of the second support assembly on the leg assembly can be made to correspond to the rear scale mark corresponding to the focal length. When a radiograph (such as an X-ray machine) for detecting the quality of the pipe weld is placed on the first support assembly or the second support assembly, and the film and the pipe to be tested are placed on the second support assembly or the first support assembly, the focal length between the radiograph and the film meets the above-selected focal length. At this time, there is no need to place an auxiliary support device under the pipe to be tested and the film to reduce the focal length, nor is there a need to place an auxiliary support device under the radiograph to increase the focal length, and there is no need to perform repeated manual measurements to confirm the accuracy of the focal length, thereby effectively improving the efficiency of the detection work and effectively avoiding errors caused by manual measurement.

[0022] Compared with the prior art, the supporting device for small-diameter tube X-ray detection provided by the utility model can quickly adjust the second supporting component into position through the focal length scale combined with the selected focal length, so that after the film and the X-ray machine are placed on the first supporting component and the second supporting component respectively, the focal length between the film and the X-ray machine is equal to the above-mentioned selected focal length. Compared with the method of placing an auxiliary supporting device under the film or the X-ray machine to adjust the focal length, the supporting device for small-diameter tube X-ray detection can effectively simplify the operation of the focal length adjustment process, and there is no need to manually repeatedly measure the distance between the film and the X-ray machine to confirm the accuracy of the focal length, which can effectively improve the detection work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic structural diagram of a supporting device for small-diameter tube ray detection provided in an embodiment of the utility model.

[0025] Icon: 1-first support assembly; 2-second support assembly; 20-support frame; 200-slide slot; 201-long support rod; 202-short support rod; 21-support plate; 3-leg assembly; 30-slot; 31-leg; 4-base. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0029] Example:

[0030] like Figure 1As shown, the supporting device for X-ray detection of small-diameter tubes provided in this embodiment includes a first supporting assembly 1, a second supporting assembly 2 and a leg assembly 3; one of the first supporting assembly 1 and the second supporting assembly 2 is used to support the X-ray machine, and the other is used to support the pipe and film to be tested; the leg assembly 3 is provided with a focal length scale extending along its length direction, and the focal length scale includes a starting scale mark and a plurality of rear scale marks located behind it, the first supporting assembly 1 is fixed to the leg assembly 3 and corresponds to the starting scale mark of the focal length scale, and the second supporting assembly 2 can be detachably connected to any position of the leg assembly 3 and corresponds to any rear scale mark of the focal length scale; each rear scale mark of the focal length scale indicates the focal length between the X-ray machine or film on the first supporting assembly 1 and the film or X-ray machine on the second supporting assembly 2 at the rear scale mark.

[0031] During use, the first support assembly 1 can be first fixed to the leg assembly 3, and the position of the first support assembly 1 on the leg assembly 3 corresponds to the starting scale mark of the focal length scale, and then the focal length is selected according to the specifications of the pipe to be tested. Based on the focal length, the second support assembly 2 is fixed to the leg assembly 3, and the position of the second support assembly 2 on the leg assembly 3 corresponds to the rear scale mark corresponding to the focal length. When a radiograph (such as an X-ray machine) for detecting the quality of the pipe weld is placed on the first support assembly 1 or the second support assembly 2, and a film and the pipe to be tested are placed on the second support assembly 2 or the first support assembly 1, the focal length between the radiograph and the film meets the above-selected focal length. At this time, there is no need to place an auxiliary support device under the pipe to be tested and the film to reduce the focal length, nor is there a need to place an auxiliary support device under the radiograph to increase the focal length, and there is no need to manually repeat the measurement to confirm the accuracy of the focal length, thereby effectively improving the efficiency of the detection work and effectively avoiding errors caused by manual measurement.

[0032] Compared with the prior art, the supporting device for small-diameter tube X-ray detection provided in this embodiment can quickly adjust the second supporting component 2 into position through the focal length scale combined with the selected focal length, so that after the film and the X-ray machine are placed on the first supporting component 1 and the second supporting component 2 respectively, the focal length between the film and the X-ray machine is equal to the above-mentioned selected focal length. Compared with the method of placing an auxiliary supporting device under the film or the X-ray machine to adjust the focal length, the supporting device for small-diameter tube X-ray detection can effectively simplify the operation of the focal length adjustment process, and there is no need to manually repeatedly measure the distance between the film and the X-ray machine to confirm the accuracy of the focal length, which can effectively improve the detection work efficiency.

[0033] The first support assembly 1 and the second support assembly 2 may be arranged one above the other on the leg assembly 3 . In this embodiment, the first support assembly 1 is preferably located above the second support assembly 2 .

[0034] If the first support assembly 1 located at the top is used to support the pipe to be tested and the film, then in order to enable the X-ray machine on the second support assembly 2 to irradiate the pipe to be tested, an auxiliary device must be provided on the first support assembly 1 to fix the pipe to be tested. Therefore, in order to improve the ease of use of the support device for X-ray detection of small-diameter tubes, this embodiment preferably uses the first support assembly 1 to support the X-ray machine, and a through hole is provided on the first support assembly 1 to expose the X-ray window of the X-ray machine, and the second support assembly 2 is used to support the pipe to be tested and the film.

[0035] In this embodiment, if Figure 1 As shown, a position of the leg assembly 3 corresponding to each rear scale mark is provided with a limiting portion, and the second support assembly 2 can be fixed at any rear scale mark through the limiting portion.

[0036] After the focal length is selected and the second support assembly 2 is adjusted to the rear scale mark corresponding to the selected focal length, the position of the second support assembly 2 on the leg assembly 3 can be fixed by the limit portion, so that the focal length between the X-ray machine and the film is stably maintained at the selected focal length.

[0037] It can be seen that the second limiting portion can effectively fix the position of the second supporting assembly 2 after adjusting the position of the second supporting assembly 2, thereby ensuring that the subsequent detection process can be carried out stably.

[0038] The limiting portion may be an outwardly extending support platform, or may be a clamping structure that can be clamped with the second support assembly 2 .

[0039] In order to improve the stability of the second support component 2 on the leg component 3, the limiting portion of this embodiment is preferably a slot 30. At this time, the second support component 2 can adopt a plate-like structure, and the stability between the second support component 2 and the slot 30 can be ensured by snapping the edge of the second support component 2 into the slot 30.

[0040] like Figure 1 As shown, when the limiting portion is a slot 30, the slots 30 corresponding to each rear scale mark on the leg assembly 3 can be distributed in sequence and form a structure similar to a rectangular wave. At this time, the spacing between each group of two adjacent slots 30 is equal.

[0041] Furthermore, the height of the leg assembly 3 can be 1200mm, and the size of the radial section can be 700×300mm; the spacing between each group of two adjacent slots 30 can be 100mm, and the depth of each slot 30 can be 50mm and the width can be 20mm; at this time, the adjustable focal length range of the support device for small-diameter tube radiographic detection can be 100-1200mm. Among them, the adjustable focal length range of 100-1200mm covers the transillumination focal length of various specifications of small-diameter tubes, and can meet the detection requirements of various specifications of small-diameter tubes.

[0042] In this embodiment, if Figure 1 As shown, the leg assembly 3 may include a plurality of legs 31, and the plurality of legs 31 are spaced apart along the circumference of the first support assembly 1, each leg 31 is provided with a focal length scale, and the same scale marks in the focal length scales of the plurality of legs 31 are located on the same horizontal plane.

[0043] The multiple legs 31 can effectively ensure the support stability of the leg assembly 3 for the first support assembly 1 and the second support assembly 2. At this time, in order to further improve the stability of the second support assembly 2 on the leg assembly 3, a limiting portion can be provided at each scale mark in the focal length scale of each leg 31. When the second support assembly 2 is adjusted to the rear scale mark of each leg 31 corresponding to the selected focal length according to the selected focal length, the limiting portions on each leg 31 located on the peripheral side of the second support assembly 2 are mutually engaged with the second support assembly 2.

[0044] like Figure 1 As shown, the second support assembly 2 includes a support frame 20 and a support plate 21. The support frame 20 can be connected to any rear scale mark of the leg assembly 3. The support plate 21 is installed on the support frame 20 to support the pipe and film to be tested.

[0045] The support frame 20 is used to support the support plate 21, and the support plate 21 is used to support the film and the pipe to be tested. In addition, the support frame 20 can also reduce the overall weight of the second support assembly 2, and facilitate the connection between the second support assembly 2 and the leg assembly 3; the support plate 21 can effectively increase the support area of ​​the second support assembly 2 for the film and the pipe to be tested, thereby effectively improving the stability of the film and the pipe to be tested during the detection process.

[0046] Furthermore, the support plate 21 is slidably connected to the support frame 20 along the eccentricity direction between the focus of the radiation source of the radiation machine on the first support assembly 1 and the weld of the pipe to be tested on the support plate 21 .

[0047] Among them, eccentricity refers to the distance that the focus of the radiation source deviates from the center plane of the weld.

[0048] In the process of using a X-ray machine to perform oblique transillumination elliptical imaging on the pipe to be tested, it is necessary not only to adjust the vertical distance between the X-ray machine and the film according to the selected focal length, but also to adjust the horizontal distance between the focus of the X-ray source of the X-ray machine and the weld of the pipe to be tested according to the selected eccentricity.

[0049] The support plate 21 in this embodiment is slidably connected to the support frame 20 along the eccentricity direction. Based on this, the support plate 21 can drive the pipe to be tested and the film thereon to slide on the support frame 20 along the eccentricity direction at the same time, thereby adjusting the position of the weld of the pipe to be tested until the horizontal distance between the weld of the pipe to be tested and the focus of the radiation source of the X-ray machine meets the selected eccentricity.

[0050] Furthermore, an indicator mark is provided at a position of the support plate 21 corresponding to the focus of the radiation source of the X-ray machine on the first support assembly 1, and the indicator mark is used to coincide with the projection of the weld of the pipe to be tested on the support plate 21 when the pipe to be tested is supported on the support plate 21.

[0051] When the support plate 21 is in the original position on the support frame 20, the projection of the focus of the radiation source of the X-ray machine on the first support assembly 1 on the support plate 21 coincides with the indicator mark. Based on this, the pipe to be tested is placed on the support plate 21 and the projection of the weld of the pipe to be tested on the support plate 21 coincides with the indicator mark, so that the weld of the pipe to be tested and the focus of the radiation source of the X-ray machine are on the same vertical line. At this time, sliding the support plate 21 on the support frame 20 along the eccentricity direction can drive the weld of the pipe to be tested to move along the eccentricity direction, thereby realizing the eccentricity adjustment process between the weld and the focus of the radiation source.

[0052] It can be seen that an indicator mark is provided on the support plate 21 to facilitate calibration of the position of the focus of the radiation source of the X-ray machine, thereby facilitating subsequent eccentricity adjustment, which can further effectively improve the ease of use of the support device for small-diameter tube X-ray detection.

[0053] The indicator mark can be provided on the support plate 21 by pasting, painting or engraving. To ensure the durability and stability of the indicator mark, the indicator mark in this embodiment is preferably a scratch engraved on the support plate 21 .

[0054] In this embodiment, the support frame 20 can be provided with an eccentricity scale extending along the sliding direction of the support plate 21, and the indicator mark on the support plate 21 is used to correspond to any scale mark in the eccentricity scale after the support plate 21 slides; each scale mark in the eccentricity scale indicates the eccentricity between the focus of the radiation source of the radiation machine on the first support assembly 1 and the scale mark.

[0055] It should be noted that in the existing X-ray detection process, the distance between the focus of the X-ray source and the weld is usually measured manually, and then the weld position is repeatedly adjusted to make the above distance meet the selected eccentricity. However, manual measurement is prone to deviations. When the actual eccentricity deviates, the width of the elliptical opening after imaging the pipe to be tested will be too large or too small. At this time, the film quality is poor, which will lead to a large deviation in the final detection result.

[0056] The support frame 20 in the second support assembly 2 in this embodiment is provided with an eccentricity scale. When the actual eccentricity between the weld and the focus of the radiation source needs to be adjusted, the eccentricity can be first calculated and selected according to the pipe specifications, and then the weld of the pipe to be tested on the support plate 21 is projected on the support plate 21 to coincide with the indicator mark on the support plate 21. At this time, the weld of the pipe to be tested, the indicator mark on the support plate 21 and the focus of the radiation source of the radiation machine on the first support assembly 1 are located on the same vertical line. Then, the support plate 21 can be slid on the support frame 20 according to the selected eccentricity until the indicator mark on the support plate 21 reaches the scale mark corresponding to the selected eccentricity in the eccentricity scale. At this time, the support plate 21 will drive the weld of the pipe to be tested thereon to reach the scale mark at the same time. The actual eccentricity between the weld of the pipe to be tested and the focus of the radiation source of the radiation machine on the first support assembly 1 meets the selected eccentricity, and the eccentricity adjustment process can be realized.

[0057] It can be seen that this embodiment can effectively simplify the eccentricity adjustment process by setting an eccentricity scale on the support frame 20 in the second support assembly 2, eliminating the need for manual repeated measurement and adjustment of the position of the weld of the pipe to be tested, thereby effectively improving the detection efficiency and reducing manual measurement errors, thereby ensuring the detection quality.

[0058] It should also be noted that, by setting a focal length scale on the leg assembly 3 and an eccentricity scale on the support frame 20 in the second support assembly 2, this embodiment can effectively save the measurement time of the focal length and eccentricity in the existing inclined transillumination elliptical imaging process, and can significantly improve the detection efficiency when a large number of small-diameter tubes need to be subjected to X-ray detection.

[0059] In this embodiment, a slide groove 200 is provided on the support frame 20 , and the support plate 21 is slidably connected in the slide groove 200 .

[0060] The slide groove 200 can accommodate the support plate 21 and limit the support plate 21, thereby effectively ensuring the stability of the support plate 21 during the sliding process.

[0061] like Figure 1 As shown, the support frame 20 may include a long support rod 201 and a short support rod 202 , the long support rod 201 is used to be connected to any rear scale mark of the leg assembly 3 , and the short support rod 202 is fixed on the long support rod 201 ; the support plate 21 is installed on the short support rod 202 .

[0062] The long support rod 201 and the short support rod 202 can be fixedly connected by welding, screw connection, etc. The long support rod 201 is used to be snapped into the aforementioned slot 30, and the short support rod 202 can be provided with the aforementioned eccentricity scale.

[0063] Furthermore, two long support rods 201 and two short support rods 202 can be used, the two long support rods 201 are arranged in parallel, the two short support rods 202 are arranged in parallel and the two short support rods 202 are respectively vertically fixed on the two long support rods 201. At this time, the side surfaces facing each other of the two short support rods 202 can be provided with grooves, and the grooves can cooperate with each other to form the aforementioned slide groove 200 for accommodating the support plate 21.

[0064] Among them, there is no restriction on the sizes of the short support rod 202 and the long support rod 201. In this embodiment, the length of the short support rod 202 can be 200 mm, and the size of the radial cross-section can be 40×2 mm; the length of the long support rod 201 can be 350 mm, and the size of the radial cross-section can be 40×2 mm.

[0065] In addition, there is no limitation on the size of the support plate 21. In the present embodiment, the support plate 21 may be 300 mm in length, 250 mm in width, and 8 mm in thickness.

[0066] like Figure 1 As shown, the first support assembly 1 is an annular support frame, and the support frame is used to accommodate the X-ray machine.

[0067] The annular support frame can not only accommodate the X-ray machine, but also expose the X-ray window of the X-ray machine, so that the X-ray window of the X-ray machine can face the pipe and film to be tested on the second support assembly 2.

[0068] Furthermore, the first support assembly 1 can be fixed to the top of the support leg assembly. In this case, the first support assembly 1 can provide a wider installation space for the X-ray machine, making it easier to install the X-ray machine on the first support assembly 1.

[0069] In addition, if Figure 1 As shown, a base 4 may be provided at the bottom of the leg assembly 3. The base 4 may increase the contact area between the leg assembly 3 and the ground, thereby effectively improving the use stability of the support device for small-diameter tube ray detection.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A supporting device for small-diameter tube ray detection, characterized in that: It comprises a first support assembly (1), a second support assembly (2) and a leg assembly (3); One of the first supporting assembly (1) and the second supporting assembly (2) is used to support the X-ray machine, and the other is used to support the pipe to be tested and the film; The leg assembly (3) is provided with a focal length scale extending along its length direction, the focal length scale comprising a starting scale mark and a plurality of rear scale marks located behind the starting scale mark, the first support assembly (1) is fixed to the leg assembly (3) and corresponds to the starting scale mark of the focal length scale, and the second support assembly (2) can be detachably connected to any position of the leg assembly (3) and corresponds to any rear scale mark of the focal length scale; Each rear scale mark of the focal length scale indicates the focal length between the X-ray machine or film on the first supporting assembly (1) and the film or X-ray machine on the second supporting assembly (2) at the rear scale mark.

2. The supporting device for small-diameter tube radiation detection according to claim 1, characterized in that: The leg assembly (3) is provided with a limiting portion at a position corresponding to each of the rear scale marks, and the second support assembly (2) can be fixed at any of the rear scale marks via the limiting portion.

3. The supporting device for small-diameter tube radiation detection according to claim 2, characterized in that: The limiting portion is a clamping groove (30).

4. The supporting device for small-diameter tube radiation detection according to any one of claims 1 to 3, characterized in that: The second support assembly (2) comprises a support frame (20) and a support plate (21); the support frame (20) can be connected to any rear scale mark of the leg assembly (3); the support plate (21) is mounted on the support frame (20) and is used to support the pipe to be tested and the film.

5. The supporting device for small-diameter tube radiation detection according to claim 4, characterized in that: The support plate (21) is slidably connected to the support frame (20) along the eccentricity direction between the radiation source focus of the radiation machine on the first support assembly (1) and the weld of the pipe to be tested on the support plate (21).

6. The supporting device for small-diameter tube radiation detection according to claim 5, characterized in that: An indication mark is provided at a position of the support plate (21) corresponding to the focus of the radiation source of the radiation machine on the first support assembly (1), and the indication mark is used to coincide with the projection of the weld of the pipe to be tested on the support plate (21) when the pipe to be tested is supported on the support plate (21).

7. The supporting device for small-diameter tube radiation detection according to claim 6, characterized in that: The support frame (20) is provided with an eccentricity scale extending along the sliding direction of the support plate (21), and the indicator mark on the support plate (21) is used to correspond to any scale mark on the eccentricity scale after the support plate (21) slides; Each scale mark in the eccentricity scale indicates the eccentricity between the focus of the radiation source of the radiation machine on the first support component (1) and the scale mark.

8. The supporting device for small-diameter tube radiation detection according to claim 5, characterized in that: The support frame (20) is provided with a slide groove (200), and the support plate (21) is slidably connected in the slide groove (200).

9. The supporting device for small-diameter tube radiation detection according to any one of claims 1 to 3, characterized in that: The first support assembly (1) is an annular support frame, and the support frame is used to accommodate the X-ray machine.

10. The supporting device for small-diameter tube radiation detection according to any one of claims 1 to 3, characterized in that: The leg assembly (3) comprises a plurality of legs (31), the plurality of legs (31) being distributed at intervals along the circumference of the first support assembly (1), each of the legs (31) being provided with the focal length scale, and the same scale marks in the focal length scales of the plurality of legs (31) being located on the same horizontal plane.

Images