Small diameter pipe butt weld gamma ray detection auxiliary device and method

Abstract

The present invention proposes a gamma-ray detection auxiliary device and method for butt welds of small-diameter pipe systems. It includes a bottom fixing and locking structure and a radiation source focal length and angle adjustment structure; the bottom fixing and locking structure is used to fix the device on the adjacent pipe system, and adjust the distance from the weld front and back, and a focus adjustment support rod is arranged on the top of the bottom fixing and locking structure; the radiation source focal length and angle adjustment structure is used to install the radiation source head, and the radiation source focal length and angle adjustment structure has a focus adjustment sleeve; the radiation source focal length and angle adjustment structure is installed on the focus adjustment support rod of the bottom fixing and locking structure through the focus adjustment sleeve, and the relative position of the radiation source head and the pipeline is maintained by adjusting the position of the focus adjustment sleeve on the focus adjustment support rod. The method adjusts the focus adjustment support rod through the device to fix the radiation source head, adjust the filming process, and efficiently improve the success rate of filming, which is suitable for use as a gamma-ray detection auxiliary device and method for butt welds.

Description

Technical Field

[0001] The invention relates to weld detection in the field of welding, and in particular to a gamma-ray detection auxiliary device and method for butt welds of small-diameter pipes. Background Art

[0002] The quality of pipe butt welds is an important part of the quality system. γ-ray testing of small-diameter pipe welds is the main means of testing product welding quality and is currently the only method to detect internal defects in welds. According to relevant technical standards, the radiographic filming of pipe butt welds with a diameter less than φ100mm should use the elliptical imaging method or the vertical transillumination method. Both transillumination methods have their own requirements for the projection opening and shooting angle of the weld.

[0003] However, the inventors of this application found that the above technology has at least the following technical problems in the process of implementing the technical solution of the invention in the embodiment of this application: During on-site inspections in narrow spaces, due to the lack of mature auxiliary tooling, inspectors can only adjust the radiography arrangement based on experience. During the adjustment, they need to constantly move the position of the radiation source, which causes the relative position of the radiation source and the pipe to deviate, making the final imaging angle of the weld random. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the embodiment of the present application provides an auxiliary device and method for gamma-ray detection of butt welds of small-diameter pipes due to the deviation of the relative position between the radiation source and the pipeline, which leads to the randomness of the gamma-ray filming of butt welds of small-diameter pipes. The method adjusts the focal length adjustment support rod through the auxiliary device to fix the radiation source, improves the high-precision adjustment filming process in a small space, and efficiently improves the success rate of filming, thereby solving the technical problem of gamma-ray filming of butt welds of small-diameter pipes.

[0005] The solution adopted by the embodiment of the present application to solve the technical problem is: Auxiliary device for gamma-ray detection of butt welds of small-diameter pipes, including a bottom fixing and locking structure and a radiation source focal length and angle adjustment structure; The bottom fixing and locking structure is used to fix the device on the adjacent pipe system and adjust the distance from the weld front and back. A focal length adjustment support rod is arranged on the top of the bottom fixing and locking structure; The radiation source focus and angle adjustment structure is used to install the radiation source head, and is provided with a focus adjustment sleeve; the radiation source focus and angle adjustment structure is installed on the focus adjustment support rod of the bottom fixing and locking structure through the focus adjustment sleeve, and the relative position of the radiation source head and the pipeline is maintained by adjusting the position of the focus adjustment sleeve on the focus adjustment support rod.

[0006] In a preferred embodiment, the bottom fixing and locking structure includes a clamping seat, a protective rubber gasket, a support rod, a locking screw, a locking handle, a connecting nut and a focal length adjustment support rod; The clamping seat is a side-mounted V-shaped structure used to clamp the pipeline; The protective rubber gasket is a rectangular sheet, arranged on the inner side of the clamping seat and in contact with the pipeline, playing the role of fastening and protecting the pipeline; The support rod is an inverted U-shaped structure, and a clamping seat is fixedly connected to one end of the two wings of the support rod; The other ends of the two wings of the support rod are fixedly connected with locking nuts, the locking screws are threadedly connected with the locking nuts and penetrate the locking nuts, and another clamping seat is connected to the first end of the locking screw through a limit screw, and the V-shapes of the two clamping seats are symmetrical to each other to clamp the pipeline clamp; A locking handle is provided at the tail end of the locking screw. Rotating the locking handle drives the locking screw to pull the clamping seat on it to move, thereby binding the pipeline between the two clamping seats. A connecting nut is provided at the top of the support rod for connecting the focus adjustment support rod; The upper part of the focus adjustment support rod is assembled with the radiation source focus and angle adjustment structure, and the lower part of the focus adjustment support rod is provided with a connecting bolt for threading with a connecting nut.

[0007] In a preferred embodiment, the radiation source focus and angle adjustment structure includes a focus adjustment sleeve, an adjustment nut, a fixing screw, an adjustment handle and a radiation source fixing wire; The focus adjustment sleeve is a hollow structure and is sleeved on the upper part of the focus adjustment support rod; an adjustment nut is arranged on the side of the focus adjustment sleeve, and the head end of the fixing screw is threadedly connected with the adjustment nut and extends through and into the inner wall of the focus adjustment sleeve, thereby locking the focus adjustment sleeve on the focus adjustment support rod; an adjustment handle is arranged at the tail end of the fixing screw for driving the fixing screw to rotate; a radiation source fixing wire is also arranged on the side of the focus adjustment sleeve for bundling radiation sources of different specifications.

[0008] In order to further solve the technical problem to be solved by the embodiment of the present application, the gamma-ray detection method of small-diameter pipe butt weld provided by the embodiment of the present application includes the following steps: Step 1: Determine the radiographic inspection process conditions such as focal length, focus and weld angle according to the requirements and acceptance standards for radiographic inspection of small-diameter pipes with different diameters; Step 2: Fix the device on the pipe system near the weld of the small-diameter pipe to be inspected, and ensure that the pipe system body used to fix the device is not damaged; Step 3: By adjusting the position of the focus adjustment sleeve on the focus adjustment support rod, adjust the distance scale of the radiation source fixing wire on the focus adjustment support rod and lock it, so that the focal length meets the process standard requirements; Step 4: Fix the radiation source on the radiation source fixing wire to realize the γ-ray flaw detection and film exposure of the weld.

[0009] Positive effects: The technical solution provided in the embodiments of the present application has at least the following technical effects or advantages: 1. Since the embodiment of the present application adopts a technical means in which a clamping seat is provided at one end of the two wings of the support rod, the other end of the two wings of the support rod is connected to the locking nut, the locking screw passes through the locking nut, and is connected to another clamping seat by a limit screw, the relative position between the two clamping seats can be adjusted by rotating the locking handle, which effectively solves the technical problem in the prior art that the relative position of the radiation source and the pipeline deviates, resulting in randomness in the gamma-ray filming of the butt weld of the small-diameter pipe system, and adjusts the distance between the radiation source and the weld front and back, thereby achieving the required technical effect of clamping and fixing the device on the pipe system near the weld of the small-diameter pipe to be inspected.

[0010] 2. Since the embodiment of the present application adopts a technical means of installing a focus adjustment sleeve on the focus adjustment support rod, and the focus adjustment sleeve is provided with a radiation source fixing wire to bind the radiation source, by adjusting the position of the focus adjustment sleeve on the focus adjustment support rod and locking it with a fixing screw, the technical problem of the relative position deviation between the radiation source and the pipeline in the prior art, which leads to the randomness of gamma-ray radiography of the butt weld of small-diameter pipe system, is effectively solved, and the distance between the radiation source and the weld is adjusted up and down, thereby achieving the technical effect of the radiographic focal length required by the radiographic inspection standards for welds of different specifications and diameters.

[0011] The invention is suitable for use as an auxiliary device and method for gamma-ray detection of butt welds of small-diameter pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0013] Figure 1 This is the front view of the present embodiment; Figure 2 This is the AA cross-sectional view of this embodiment; Figure 3 Schematic diagram of the working state of this embodiment.

[0014] In the figure: 1. Bottom fixing and locking structure, 11. Clamping seat, 12. Protective rubber gasket, 13. Support rod, 131. Lock nut, 14. Locking screw, 141. Limit screw, 15. Lock the handle. 16. Coupling nut, 17. Focus adjustment rod, 171. Connecting bolts; 2. Radiation source focal length and angle adjustment structure, 21.Focus adjustment sleeve, 22. Adjust the nut, 23. Fixing screws, 24. Adjust the handle, 25. Steel wire for fixing the radiation source. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Although the embodiments of the present invention have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention.

[0016] The embodiment of the present application solves the problem of relative position deviation between the radiation source and the pipe that is easy to occur in the prior art by providing a gamma-ray detection auxiliary device for butt welds of small-diameter pipes, and uses an adjustable fixture and adjusts the focal length of the radiation source in the radiographic flaw detection film to improve the accuracy of the detection process and significantly improve the efficiency and success rate of filming. It has the characteristics of high efficiency, high precision, labor saving, convenience and flexibility, and stable and reliable effect, and can be applied to the radiographic detection of gamma welds of butt welds of small-diameter pipes of various specifications and small-diameter pipes in various complex spaces.

[0017] As shown in the figure, the gamma-ray detection auxiliary device for butt welds of small-diameter pipes includes a bottom fixing and locking structure 1 and a radiation source focal length and angle adjustment structure 2; The bottom fixing and locking structure 1 is used to fix the device on the adjacent pipe system and adjust the distance from the weld seam forward and backward. A focal length adjustment support rod 17 is provided on the top of the bottom fixing and locking structure 1; The radiation source focal length and angle adjustment structure 2 is used to install the radiation source head, and the radiation source focal length and angle adjustment structure 2 is provided with a focal length adjustment sleeve 21; the radiation source focal length and angle adjustment structure 2 is installed on the focal length adjustment support rod 17 of the bottom fixing and locking structure 1 through the focal length adjustment sleeve 21, and by adjusting the position of the focal length adjustment sleeve 21 on the focal length adjustment support rod 17, the distance between the radiation source head and the weld is adjusted up and down to meet the requirements of radiation detection, maintain the relative position of the radiation source head and the pipeline, and avoid the randomness of the final imaging angle of the weld.

[0018] In order to ensure the stability of the structure of this embodiment, the bottom fixing and locking structure 1 includes a clamping seat 11, a protective rubber gasket 12, a support rod 13, a locking screw 14, a locking handle 15, a connecting nut 16 and a focal length adjustment support rod 17; The clamping seat 11 is a side-mounted V-shaped structure used for clamping the pipeline; The protective rubber gasket 12 is a rectangular sheet, arranged on the inner side of the clamping seat 11 and in contact with the pipeline, playing the role of fastening and protecting the pipeline; The support rod 13 is an inverted U-shaped structure, and a clamping seat 11 is fixedly connected to one end of the two wings of the support rod 13; The other ends of the two wings of the support rod 13 are fixedly connected with a locking nut 131, and the locking screw 14 is threadedly connected with the locking nut 131 and penetrates the locking nut 131. Another clamping seat 11 is connected to the head end of the locking screw 14 through a limit screw 141. The V-shapes of the two clamping seats 11 are symmetrical to each other to clamp the pipeline. A locking handle 15 is provided at the tail end of the locking screw 14. The locking handle 15 is rotated to drive the locking screw 14 to pull the clamping seat 11 thereon to move, thereby binding the pipeline between the two clamping seats 11. A connecting nut 16 is provided at the top of the support rod 13 for connecting the focus adjustment support rod 17; The upper portion of the focus adjustment support rod 17 is assembled with the radiation source focus and angle adjustment structure 2 , and the lower portion of the focus adjustment support rod 17 is provided with a connecting bolt 171 for threaded connection with the connecting nut 16 .

[0019] Specifically, the clamping seat 11 is an angle steel L40X40X5 made of Q235A material, the support rod 13 is a φ14X2 seamless steel pipe made of 022Cr17Ni12Mo2 material, and the focal length adjustment support rod 17 is a φ10X2 seamless steel pipe made of 06Cr18Ni11Ti material. One end of the two wings of the support rod 13 is fixedly connected to a clamping seat 11 by welding, and the other end of the two wings of the support rod 13 is welded to the locking nut 131, and the connecting nut 16 is welded to the top of the support rod 13; the locking screw 14 passes through the locking nut 131 and is connected to the other clamping seat 11 through the limit screw 141; the locking handle 15 is rotated to adjust the relative position between the two clamping seats 11 to achieve the requirement of clamping and fixing the device on the pipe system near the weld of the small-diameter pipe to be inspected.

[0020] In order to optimize the structure of this embodiment, the radiation source focus and angle adjustment structure 2 includes a focus adjustment sleeve 21, an adjustment nut 22, a fixing screw 23, an adjustment handle 24 and a radiation source fixing wire 25; The focus adjustment sleeve 21 is a hollow structure and is sleeved on the upper part of the focus adjustment support rod 17; an adjusting nut 22 is arranged on the side of the focus adjustment sleeve 21, and the head end of the fixing screw 23 is screwed with the adjusting nut 22 and extends through the inner wall of the focus adjustment sleeve 21, thereby locking the focus adjustment sleeve 21 on the focus adjustment support rod 17 and fixing it; an adjusting handle 24 is arranged at the tail end of the fixing screw 23, which is used to drive the fixing screw 23 to rotate and adjust the height of the focus adjustment sleeve 21 on the focus adjustment support rod 17; a radiation source fixing wire 25 is also arranged on the side of the focus adjustment sleeve 21, which is used to bundle radiation sources of different specifications. When performing gamma ray detection, the radiation source is fixed on the radiation source fixing wire 25, and the fixing screw 23 is locked and fixed to the corresponding position on the focus adjustment support rod 17 by adjusting the focus adjustment support rod 17, thereby realizing the adjustment function of the focus of the radiation source.

[0021] Specifically, the focus adjustment sleeve 21 is a φ14X1.5 seamless steel tube made of 06Cr18Ni11Ti. The focus adjustment sleeve 21 is sleeved on the focus adjustment support rod 17. By adjusting the position of the focus adjustment sleeve 21 on the focus adjustment support rod 17 and locking it with a fixing screw 23, the radiation source is fixed to the radiation source fixing wire 25 to meet the requirements of the filming focal length process conditions required by the radiographic inspection standards for welds of different specifications and diameters.

[0022] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages: Since a clamping seat 11 is provided at one end of the two wings of the support rod 13, the other end of the two wings of the support rod 13 is connected to the locking nut 131, the locking screw 14 passes through the locking nut 131, and is connected to another clamping seat 11 through the limit screw 141; therefore, by rotating the locking handle 15, the relative position between the two clamping seats 11 can be adjusted to achieve the requirement of clamping and fixing the device on the pipe system near the small-diameter pipe weld that needs to be inspected.

[0023] Since the focus adjustment sleeve 21 is mounted on the focus adjustment support rod 17 and the focus adjustment sleeve 21 is provided with a radiation source fixing wire 25 to bind the radiation source, the focal length required by the radiographic inspection standards for welds of different pipe diameters can be met by adjusting the position of the focus adjustment sleeve 21 on the focus adjustment support rod 17 and locking it with the fixing screw 23.

[0024] The gamma ray detection method for butt welds of small diameter pipes includes the following steps: Step 1: Determine the radiographic inspection process conditions such as focal length, focus and weld angle according to the requirements and acceptance standards for radiographic inspection of small-diameter pipes with different diameters; Step 2: Fix the device on the pipe system near the weld of the small-diameter pipe to be inspected, and ensure that the pipe system body used to fix the device is not damaged; Step 3: By adjusting the position of the focus adjustment sleeve 21 on the focus adjustment support rod 17, the distance scale of the radiation source fixing wire 25 on the focus adjustment support rod 17 is adjusted and locked, so that the focal length meets the process standard requirements; Step 4: Fix the radiation source head on the radiation source fixing wire 25 to realize the weld gamma-ray flaw detection film exposure.

[0025] The working process of this embodiment: Taking the radiographic inspection of pipe butt welds with adjacent distances of 50 cm and diameters of φ50mm×4.5 and φ30mm×3 in a narrow space as an example, the forming steps and process are explained in detail.

[0026] Step 1: After determining the location where X-ray flaw detection is required, according to the standard requirements, the focal lengths of the X-ray detection process for two specifications of pipe systems should be 407mm and 209mm respectively.

[0027] Step 2: The relative position of the bottom clamping seat 11 of the device is adjusted by the locking handle 15 so that the device is fixed on the adjacent pipe system.

[0028] Step 3: Move and adjust the radiation source fixing wire 25 to the 407mm or 209mm scale position by adjusting the focal length adjustment sleeve 21 to meet the X-ray flaw detection filming process requirements.

[0029] Step 4: Fix the radiation source head on the radiation source fixing wire 25 to realize the exposure of the radiographic flaw detection film and complete the filming.

[0030] It is worth noting that the contents not described in detail in the specification belong to the prior art known to those skilled in the art, and the model parameters of the locking nut 131, the locking screw 14, the limit screw 141, the connecting nut 16, the connecting bolt 171, the adjusting nut 22, the fixing screw 23, the radiation source fixing wire 25 and the radiation source head are not specifically limited and can be determined using conventional equipment. In this technical solution, the electrical control components not mentioned are not shown in the figure because they belong to the prior art and are not described here.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gamma ray detection auxiliary device for butt welds of small diameter pipes, characterized by: It includes a bottom fixing and locking structure (1) and a radiation source focal length and angle adjustment structure (2); The bottom fixing and locking structure (1) is used to fix the device on the adjacent pipe system and adjust the distance from the weld seam forward and backward. A focal length adjustment support rod (17) is arranged on the top of the bottom fixing and locking structure (1); The radiation source focus and angle adjustment structure (2) is used to install the radiation source head, and the radiation source focus and angle adjustment structure (2) is provided with a focus adjustment sleeve (21); the radiation source focus and angle adjustment structure (2) is installed on the focus adjustment support rod (17) of the bottom fixing and locking structure (1) through the focus adjustment sleeve (21), and the relative position of the radiation source head and the pipeline is maintained by adjusting the position of the focus adjustment sleeve (21) on the focus adjustment support rod (17).

2. The gamma-ray detection auxiliary device for butt welds of small-diameter pipes according to claim 1 is characterized in that: The bottom fixing and locking structure (1) comprises a clamping seat (11), a protective rubber gasket (12), a support rod (13), a locking screw (14), a locking handle (15), a connecting nut (16) and a focal length adjustment support rod (17); The clamping seat (11) is a side-mounted V-shaped structure used for clamping the pipeline; The protective rubber gasket (12) is in the shape of a rectangular sheet and is arranged on the inner side of the clamping seat (11) and is in contact with the pipeline, thereby playing the role of fastening and protecting the pipeline; The support rod (13) is an inverted U-shaped structure, and a clamping seat (11) is fixedly connected to one end of the two wings of the support rod (13); The other ends of the two wings of the support rod (13) are fixedly connected with locking nuts (131), the locking screws (14) are threadedly connected with the locking nuts (131) and penetrate the locking nuts (131), and another clamping seat (11) is connected to the head end of the locking screw (14) via a limit screw (141), and the V-shapes of the two clamping seats (11) are symmetrical to each other to clamp the pipeline; A locking handle (15) is provided at the rear end of the locking screw (14). The locking handle (15) is rotated to drive the locking screw (14) to pull the clamping seat (11) thereon to move, thereby binding the pipeline between the two clamping seats (11); A connecting nut (16) is provided at the top of the support rod (13) for connecting to the focus adjustment support rod (17); The upper portion of the focus adjustment support rod (17) is assembled with the radiation source focus and angle adjustment structure (2), and the lower portion of the focus adjustment support rod (17) is provided with a connecting bolt (171) for being threadedly connected with the connecting nut (16).

3. The gamma-ray detection auxiliary device for butt welds of small-diameter pipes according to claim 2 is characterized in that: The radiation source focal length and angle adjustment structure (2) comprises a focal length adjustment sleeve (21), an adjustment nut (22), a fixing screw (23), an adjustment handle (24) and a radiation source fixing wire (25); The focus adjustment sleeve (21) is of a hollow structure and is sleeved on the upper part of the focus adjustment support rod (17); an adjustment nut (22) is arranged on the side of the focus adjustment sleeve (21); the head end of the fixing screw (23) is threadedly connected to the adjustment nut (22) and extends through the inner wall of the focus adjustment sleeve (21), thereby locking the focus adjustment sleeve (21) on the focus adjustment support rod (17); an adjustment handle (24) is arranged at the tail end of the fixing screw (23) for driving the fixing screw (23) to rotate; and a radiation source fixing wire (25) is also arranged on the side of the focus adjustment sleeve (21) for bundling radiation sources of different specifications.

4. A gamma ray detection method for butt welds of small diameter pipes, characterized by: The device according to any one of claim 3 comprises the following steps: Step 1: Determine the radiographic inspection process conditions such as focal length, focus and weld angle according to the requirements and acceptance standards for radiographic inspection of small-diameter pipes with different diameters; Step 2: Fix the device on the pipe system near the weld of the small-diameter pipe to be inspected, and ensure that the pipe system body used to fix the device is not damaged; Step 3: by adjusting the position of the focus adjustment sleeve (21) on the focus adjustment support rod (17), adjusting the distance scale of the radiation source fixing wire (25) on the focus adjustment support rod (17) and locking it, the focal length meets the process standard requirements; Step 4: Fix the radiation source head on the radiation source fixing wire (25) to realize the weld gamma-ray flaw detection film exposure.

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