Pipeline butt weld inner wall exposure device and detection process thereof

Abstract

The invention relates to a pipeline butt weld inner wall exposure device and a detection process thereof, and relates to the technical field of weld detection, the pipeline butt weld inner wall exposure device comprises a gamma-ray flaw detector, an exposure head and a wire connecting the gamma-ray flaw detector and the exposure head, and further comprises an arc-shaped pipe, the outer wall of a second straight pipe is rotationally connected with a plurality of supporting rods, and the supporting rods are evenly distributed in the circumferential direction of the second straight pipe; a torsional spring is arranged between the supporting rod and the second straight pipe, elastic force of the torsional spring drives the supporting rod to rotate away from the second straight pipe, a pull wire is fixed to the inner wall of the supporting rod and penetrates through the arc-shaped pipe, and an embedding groove allowing the supporting rod to enter is formed in the outer wall of the second straight pipe. The arc-shaped tube in the detection device can be inserted into the test tube and taken out reversely, and the exposure head can be positioned on the central axis of the test tube through the support rod and the stay wire, so that a bracket for positioning does not need to be arranged in the test tube; the device and the process can adapt to detection operation after field welding, pipe disassembly is not needed, objects cannot be left in the test pipes, the device and the process can also adapt to test pipes with different diameters, and the applicability is wide.

Description

Technical Field

[0001] The present application relates to the technical field of weld detection, and in particular to a pipeline butt weld inner wall exposure device and a detection process thereof. Background Art

[0002] X-ray detection is an important means of detecting the welding quality of thick-walled pipes. For this type of detection object, gamma rays are superior to X-ray double-wall single-image penetration. The gamma ray source has the advantages of large penetration thickness, strong penetration ability, and low equipment failure rate. Gamma source double-wall single-image detection is now also widely used.

[0003] The existing invention patent application with publication number CN104569007A discloses a device for exposing the center of a thick-walled pipe butt weld, including an arc tube for guiding a source pipe of a gamma-ray flaw detector, wherein the arc tube is composed of a first straight tube, a curved tube, and a second straight tube connected in sequence, wherein the free end of the first straight tube is located at the geometric center of the butt weld of the thick-walled pipe, and the free end of the second straight tube passes through a preset through hole of the thick-walled pipe. Through the arrangement of the arc tube, the gamma source can be effectively transported to the center of the weld for exposure, which can greatly shorten the exposure time and improve the gamma-ray operation efficiency and detection sensitivity; the first straight tube and the second straight tube of the arc tube are both telescopic tubes with a wider range of uses; the preset through hole is an existing instrument hole or a three-way port on the thick-walled pipe, and no additional holes are required.

[0004] Regarding the above-mentioned related technologies, the inventor believes that the positioning plate, the first straight pipe and other structures are difficult to remove from the pipeline, so it is a laboratory scene and cannot be adapted after on-site construction. After on-site welding construction, the pipelines are already installed in place and will not be deliberately removed. Therefore, this solution has problems such as the positioning plate, the first straight pipe and other structures cannot be removed, which is not suitable for on-site operations and needs to be improved. Summary of the invention

[0005] The present application provides a pipeline butt weld inner wall exposure device and a detection process thereof. The detection device can be inserted into the pipeline and taken out in the reverse direction, and can be adapted to on-site post-weld detection operations without dismantling the pipe.

[0006] The present application provides a pipeline butt weld inner wall exposure device, which adopts the following technical solution:

[0007] The inner wall exposure device of a pipeline butt weld includes a gamma-ray flaw detector, an exposure head and a wire connecting the two, and also includes an arc tube, wherein the arc tube includes a first straight tube, a curved tube and a second straight tube connected in sequence, the first straight tube is vertically arranged with the second straight tube, the wire passes through the interior of the arc tube, the exposure head is located outside the end of the second straight tube, the outer wall of the second straight tube is rotatably connected with a plurality of support rods, the plurality of support rods are evenly distributed along the circumference of the second straight tube, a torsion spring is arranged between the support rod and the second straight tube, the elastic force of the torsion spring drives the support rod to rotate away from the second straight tube, a pull wire is fixed to the inner wall of the support rod, the pull wire passes through the interior of the arc tube, and the outer wall of the second straight tube is provided with an embedding groove for the support rod to enter.

[0008] By adopting the above technical solution, after tightening the pull wire outside the first straight tube, the support rod can be stored in the embedded groove, so that the arc tube can be inserted into the test tube. When the pull wire is released, the support rod expands and rotates outward under the elastic force of the torsion spring, and the end of the support rod abuts the inner wall of the test tube. All the pull wires are straightened by hand, and the tension is controlled not to drive the support rod to rotate. The position of the arc tube is adjusted to make the length of all the pull wires exposed outside the first straight tube consistent. At this time, it means that the distance between the outer end of all the support rods and the center line of the second straight tube is the same, that is, the center axis of the second straight tube coincides with the center axis of the test tube, and the exposure head is located at the center of the test tube, realizing the centering operation of the exposure head and the test tube.

[0009] Optionally, a support ring is fixed inside the second straight tube, and all the pull wires pass through the support ring.

[0010] By adopting the above technical solution, the support ring contacts the pull wire through the arc-shaped inner wall, and the support ring provides guiding and reversing functions for the pull wire.

[0011] Optionally, an end plate is fixed to the end of the first straight tube, and a plurality of inner through holes are provided on the end plate for the pull wire to pass through. The end of the first straight tube is rotatably connected to a twist block, and a plurality of outer through holes are provided in the twist block for the pull wire to pass through. The outer through holes are arranged close to the inner through holes, and the pull wire can be clamped between the end plate and the twist block.

[0012] By adopting the above technical solution, when the outer through hole is opposite to the inner through hole, the pull wire can freely enter and exit the first straight tube. When the twist block is rotated, the outer through hole and the inner through hole are staggered, and the pull wire between the twist block and the end plate is bent and deformed. The end plate and the twist block clamp and fix the pull wire to prevent the pull wire from moving spontaneously, thereby facilitating operation.

[0013] Optionally, a marking line is provided on the pull wire along its length direction.

[0014] By adopting the above technical solution, the marking line is a length marking line, which makes it easy for personnel to observe the length of the pull wire exposed outside the first straight tube.

[0015] Optionally, the first straight tube outer sliding sleeve is provided with a support frame, and two magnet plates are symmetrically fixed to the support frame. The surfaces of the two magnet plates away from the support frame are adsorption surfaces, and the adsorption surfaces are planes, and the two adsorption surfaces are arranged at an angle.

[0016] By adopting the above technical solution, by simultaneously attaching the adsorption surfaces of the two magnet plates to the surface of the iron pipe, since the two adsorption surfaces are tangent to the outer surface of the iron pipe at the same time, it is ensured that the first straight pipe is perpendicular to the surface of the iron pipe, and the extension line of the first straight pipe passes through the central axis of the iron pipe, thereby achieving positioning and centering.

[0017] Optionally, a damping shaft is fixed to the exposure head, the damping shaft is connected to the second straight tube in a damping rotation manner, and a coil spring is installed between the damping shaft and the second straight tube.

[0018] By adopting the above technical solution, the coil spring stores energy for the rotation of the rotating shaft, and the exposure head is rotated to tighten the coil spring. After the exposure head is loosened, the exposure head can continue to rotate slowly for several circles. Since the exposure head rotates slowly and takes a long time, it can rotate several circles during the exposure process during detection, thereby improving the uniformity of exposure, reducing the uneven distribution of radiation in the circumferential direction, and improving the accuracy of detection.

[0019] In a second aspect, the present application provides a detection process for the exposure of the inner wall of a pipeline butt weld, which adopts the following technical solution:

[0020] The detection process for exposing the inner wall of the pipeline butt weld uses the above-mentioned pipeline butt weld inner wall exposure device, and includes the following steps:

[0021] Step S1: opening a process hole on the test tube;

[0022] Step S2: inserting the arc tube into the process hole;

[0023] Step S3: Release the pull wire, and the support rod rotates outward under the elastic force of the torsion spring, and the end of the support rod abuts against the inner wall of the test tube;

[0024] Step S4: straighten all the pull wires by hand, control the pulling force so as not to drive the support rod to rotate, and adjust the position of the arc tube so that the length of all the pull wires exposed outside the first straight tube is the same;

[0025] Step S5: starting the gamma-ray flaw detector, exposing the weld on the inner wall of the test tube with an exposure head, and then performing detection;

[0026] Step S6: After the inspection is completed, all the pull wires are pulled to rotate all the support rods into the corresponding embedded grooves, and the arc tube is pulled out of the process hole.

[0027] By adopting the above technical scheme, through the pipeline butt weld inner wall exposure device and its detection process, the arc tube in the detection device can be inserted into the test tube and taken out in the reverse direction, and the exposure head can be ensured to be located on the central axis of the test tube through the support rod and the pull wire, so there is no need to set a positioning bracket in the test tube.

[0028] Optionally, in step S2, two magnet plates of the support frame contact the outer walls of the test tube on both sides of the process hole.

[0029] By adopting the above technical solution, the two magnet plates of the support frame contact the outer walls of the test tube on both sides of the process hole, so as to correct the deviation of the first straight tube, ensure that the first straight tube is perpendicular to the surface of the test tube, and the extension line of the first straight tube passes through the central axis of the test tube. At this time, it can be ensured that the second straight tube is parallel to the central axis of the test tube.

[0030] Optionally, in step S2, before inserting the arc tube into the process hole, the exposure head is rotated to tighten the coil spring, so that the exposure head rotates under the action of the coil spring and the damping shaft.

[0031] By adopting the above technical solution, after rotating the exposure head to tighten the winding spring, the exposure head can rotate several times during the exposure process during detection, thereby improving the uniformity of exposure, reducing the uneven circumferential distribution of rays, and improving the accuracy of detection.

[0032] Optionally, the method further includes step S7: installing a plug or a valve on the process hole.

[0033] By adopting the above technical solution, the process hole is used as a subsequent vent hole, water drain hole or detection hole, so that the process hole can play a role in the subsequent time and avoid the structure being useless.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. The arc tube in the detection device can be inserted into the test tube and taken out in the reverse direction. The exposure head can be ensured to be located on the central axis of the test tube through the support rod and the pull wire, so there is no need to set a positioning bracket in the test tube;

[0036] 2. This device and process can be adapted to the inspection work after on-site welding, without dismantling the pipe, and no objects will be left in the test pipe. It can also be adapted to test pipes of different diameters, and has wide applicability;

[0037] 3. By setting up a support frame, it is convenient to align the first straight tube with the test tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a stereoscopic diagram of a pipeline butt weld inner wall exposure device according to an embodiment;

[0039] Figure 2is a three-dimensional diagram of the support rod of the embodiment in an unfolded state;

[0040] Figure 3 yes Figure 2 A magnified image of point A;

[0041] Figure 4 is a cross-sectional view of a twist block and an end plate of an embodiment;

[0042] Figure 5 is a three-dimensional diagram of a damping shaft and a coil spring of an embodiment;

[0043] Figure 6 is a stereoscopic diagram of the exposure device and the test tube in the embodiment;

[0044] Figure 7 It is a cross-sectional view of the exposure device of the embodiment in cooperation with the test tube.

[0045] Explanation of the reference numerals: 1. gamma-ray flaw detector; 11. wire; 12. exposure head; 2. arc tube; 21. first straight tube; 22. bent tube; 23. second straight tube; 3. support rod; 31. torsion spring; 32. embedded groove; 33. pull wire; 34. support ring; 24. end plate; 25. inner through hole; 4. screw block; 41. outer through hole; 35. marking line; 5. support frame; 51. magnet plate; 52. adsorption surface; 13. damping shaft; 14. coil spring; 6. test tube; 61. process hole. DETAILED DESCRIPTION

[0046] The present application is further described in detail below in conjunction with the accompanying drawings.

[0047] Embodiment 1:

[0048] Reference Figure 1 The present embodiment discloses a pipeline butt weld inner wall exposure device, including a gamma-ray flaw detector 1, an exposure head 12 and a wire 11 connecting the two, and also includes an arc tube 2, the arc tube 2 includes a first straight tube 21, a curved tube 22 and a second straight tube 23 connected in sequence, the first straight tube 21 and the second straight tube 23 are perpendicular to each other, the wire 11 passes through the interior of the arc tube 2, and the exposure head 12 is located outside the end of the second straight tube 23.

[0049] Reference Figure 2 and Figure 3The outer wall of the second straight tube 23 is rotatably connected with a plurality of support rods 3, which are evenly distributed along the circumference of the second straight tube 23, and all the support rods 3 have the same length. A torsion spring 31 is arranged between the support rod 3 and the second straight tube 23, and the two ends of the torsion spring 31 are respectively fixed to the support rod 3 and the second straight tube 23. The elastic force of the torsion spring 31 drives the support rod 3 to rotate away from the second straight tube 23, and the outer wall of the second straight tube 23 is provided with an embedding groove 32 for the support rod 3 to enter. A pull wire 33 is fixed to the inner wall of the support rod 3, and the number of the pull wire 33 corresponds to the support rod 3. The pull wire 33 passes through the interior of the arc tube 2 and passes out from the end of the first straight tube 21.

[0050] A support ring 34 is fixed inside the second straight tube 23 , and all the pull wires 33 pass through the support ring 34 . The support ring 34 contacts the pull wires 33 through the arc-shaped inner wall, and the support ring 34 provides guiding and reversing functions for the pull wires 33 .

[0051] Reference Figure 2 and Figure 4 The end of the first straight tube 21 is fixed with an end plate 24, and a plurality of inner through holes 25 are provided on the end plate 24 for the pull wire 33 to pass through, and each inner through hole 25 has a pull wire 33. The end of the first straight tube 21 is rotatably connected with a screw block 4, and a plurality of outer through holes 41 are provided in the screw block 4 for the pull wire 33 to pass through, and each outer through hole 41 has a pull wire 33. The outer through holes 41 are arranged close to the inner through holes 25, and the pull wire 33 can be clamped between the end plate 24 and the screw block 4. When the outer through hole 41 is directly opposite to the inner through hole 25, the pull wire 33 can freely enter and exit the first straight tube 21. When the screw block 4 is rotated, the outer through hole 41 is staggered with the inner through hole 25, and the pull wire 33 between the screw block 4 and the end plate 24 is bent and deformed. The end plate 24 and the screw block 4 clamp and fix the pull wire 33 to prevent the pull wire 33 from moving spontaneously.

[0052] A marking line 35 is provided on the pull wire 33 along its length direction. The marking line 35 is a length marking line. The marking line 35 is located at a section of the pull wire 33 close to the first straight tube 21. The marking line 35 is convenient for personnel to observe the length of the pull wire 33 exposed outside the first straight tube 21.

[0053] Reference Figure 2 The first straight tube 21 is slidably sleeved with a support frame 5, which includes a sleeve slidably sleeved with the first straight tube 21 and two symmetrically arranged inclined plates. The sleeve and the inclined plates are fixed by welding. The support frame 5 is symmetrically fixed with two magnet plates 51, which are respectively fixed at the bottom surfaces of the two inclined plates. The surfaces of the two magnet plates 51 away from the support frame 5 are adsorption surfaces 52, which are planes, and are arranged at an angle between the two adsorption surfaces 52. By simultaneously attaching the adsorption surfaces 52 of the two magnet plates 51 to the surface of the iron tube, since the two adsorption surfaces 52 are tangent to the outer surface of the iron tube at the same time, it is ensured that the first straight tube 21 is perpendicular to the surface of the iron tube, and the extension line of the first straight tube 21 passes through the central axis of the iron tube.

[0054] Reference Figure 5 The exposure head 12 is fixed with a damping shaft 13, which is connected to the second straight tube 23 in a damping rotational manner, and a coil spring 14 is installed between the damping shaft 13 and the second straight tube 23, the inner end of the coil spring 14 is fixed to the shaft, and the outer end of the coil spring 14 is fixed to the inner wall of the second straight tube 23. The damping shaft 13 is a prior art shaft having resistance when rotating, and the coil spring 14 stores energy for the rotation of the shaft; rotating the exposure head 12 tightens the coil spring 14, and after loosening the exposure head 12, the exposure head 12 can continue to rotate slowly for several weeks.

[0055] Embodiment 2:

[0056] Reference Figure 6 and Figure 7 A detection process for exposure of the inner wall of a pipeline butt weld is provided, using the pipeline butt weld inner wall exposure device of the first embodiment, comprising the following steps:

[0057] Step S1: a process hole 61 is opened on the test tube 6, and the process hole 61 is opened at a certain distance from the weld. It should be noted that the size of the process hole 61 is larger than the outer diameter of the arc tube 2. The support rod 3 on the first straight tube 21 is in a retracted state by default, that is, the support rod 3 is in the embedded groove 32. At this time, the length of the pull wire 33 outside the first straight tube 21 is longer, and all the pull wires 33 are locked and fixed by the cooperation of the screw block 4 and the end plate 24.

[0058] Step S2: insert the arc tube 2 into the process hole 61. First insert the first straight tube 21, then twist the angle of the arc tube 2 accordingly during the process of inserting the curved tube 22, and when the curved tube 22 completely enters the test tube 6, insert part of the length of the second straight tube 23 so that the first straight tube 21 is located near the central axis of the test tube 6.

[0059] The two magnet plates 51 of the support frame 5 contact the outer walls of the test tube 6 on both sides of the process hole 61, so as to correct the first straight tube 21 and ensure that the first straight tube 21 is perpendicular to the surface of the test tube 6. The extension line of the first straight tube 21 passes through the central axis of the test tube 6. At this time, it can be ensured that the second straight tube 23 is parallel to the central axis of the test tube 6.

[0060] Step S3: The pull wire 33 is loosened by rotating the screw block 4, and the support rod 3 rotates outward under the elastic force of the torsion spring 31, and the end of the support rod 3 abuts against the inner wall of the test tube 6. The end of the support rod 3 pulls the pull wire 33, shortening the length of the pull wire 33 outside the first straight tube 21.

[0061] Step S4: Straighten all the pull wires 33 by hand, control the pulling force so as not to drive the support rods 3 to rotate, and adjust the position of the arc tube 2 so that the lengths of all the pull wires 33 exposed outside the first straight tube 21 are consistent. At this time, it means that the distances between the outer ends of all the support rods 3 and the center line of the second straight tube 23 are the same, that is, the central axis of the second straight tube 23 coincides with the central axis of the test tube 6, and the exposure head 12 is located at the center of the test tube 6.

[0062] Step S5: Start the gamma-ray flaw detector 1, and the exposure head 12 exposes the weld on the inner wall of the test tube 6, and then performs detection.

[0063] Step S6: After the detection is completed, all the pull wires 33 are pulled to rotate all the support rods 3 into the corresponding embedding grooves 32 , and the arc tube 2 is pulled out of the process hole 61 .

[0064] Step S7: Install a plug or a valve on the process hole 61 to use it as a subsequent vent hole, water drain hole or detection hole, so that the process hole 61 can function in the subsequent time and avoid the structure being useless.

[0065] In step S2, before inserting the arc tube 2 into the process hole 61, the exposure head 12 can be rotated to tighten the coil spring 14, so that the exposure head 12 rotates under the action of the coil spring 14 and the damping shaft 13. Since the exposure head 12 rotates slowly and takes a long time, it can rotate several times during the exposure process during detection, thereby improving the uniformity of exposure, reducing the uneven distribution of radiation in the circumferential direction, and improving the accuracy of detection.

[0066] In summary, through the pipeline butt weld inner wall exposure device and its detection process, the arc tube 2 in the detection device can be inserted into the test tube 6 and taken out in the reverse direction, and the exposure head 12 can be ensured to be located on the central axis of the test tube 6 through the support rod 3 and the pull wire 33, so there is no need to set a positioning bracket in the test tube 6. The device and process can be adapted to the detection work after on-site welding, without disassembling the pipe, and no objects will be left in the test tube 6. It can also be adapted to test tubes 6 of different diameters, and has wide applicability.

[0067] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pipeline butt weld inner wall exposure device, comprising a gamma-ray flaw detector (1), an exposure head (12) and a wire (11) connecting the two, characterized in that: The invention also comprises an arc tube (2), wherein the arc tube (2) comprises a first straight tube (21), a curved tube (22) and a second straight tube (23) which are connected in sequence, wherein the first straight tube (21) and the second straight tube (23) are arranged vertically, the conductive wire (11) passes through the interior of the arc tube (2), the exposure head (12) is located outside the end of the second straight tube (23), the outer wall of the second straight tube (23) is rotatably connected with a plurality of support rods (3), the plurality of support rods (3) are evenly distributed along the circumference of the second straight tube (23), a torsion spring (31) is arranged between the support rod (3) and the second straight tube (23), the elastic force of the torsion spring (31) drives the support rod (3) to rotate away from the second straight tube (23), a pull wire (33) is fixed to the inner wall of the support rod (3), the pull wire (33) passes through the interior of the arc tube (2), and the outer wall of the second straight tube (23) is provided with an embedding groove (32) for the support rod (3) to enter.

2. The pipeline butt weld inner wall exposure device according to claim 1, characterized in that: A support ring (34) is fixed inside the second straight tube (23), and all the pull wires (33) pass through the support ring (34).

3. The pipeline butt weld inner wall exposure device according to claim 1, characterized in that: An end plate (24) is fixed to the end of the first straight tube (21), and a plurality of inner through holes (25) are provided on the end plate (24) for the pull wire (33) to pass through. The end of the first straight tube (21) is rotatably connected to a screw block (4), and a plurality of outer through holes (41) are provided in the screw block (4) for the pull wire (33) to pass through. The outer through holes (41) are arranged close to the inner through holes (25), and the pull wire (33) can be clamped between the end plate (24) and the screw block (4).

4. The pipeline butt weld inner wall exposure device according to claim 1, characterized in that: The pull wire (33) is provided with a marking line (35) along its length direction.

5. The pipeline butt weld inner wall exposure device according to claim 1, characterized in that: The first straight tube (21) is provided with a support frame (5) on the outer sliding sleeve. The support frame (5) is symmetrically fixed with two magnet plates (51). The surfaces of the two magnet plates (51) away from the support frame (5) are adsorption surfaces (52). The adsorption surfaces (52) are planes, and the two adsorption surfaces (52) are arranged at an angle.

6. The pipeline butt weld inner wall exposure device according to claim 1, characterized in that: The exposure head (12) is fixed with a damping shaft (13), the damping shaft (13) and the second straight tube (23) are connected in a damping rotation manner, and a coil spring (14) is installed between the damping shaft (13) and the second straight tube (23).

7. The detection process for the exposure of the inner wall of the pipeline butt weld is characterized by: The pipeline butt weld inner wall exposure device according to any one of claims 1 to 6 is used, comprising the following steps: Step S1: opening a process hole (61) on a test tube (6); Step S2: inserting the arc tube (2) into the process hole (61); Step S3: loosen the pull wire (33), and the support rod (3) rotates outward under the elastic force of the torsion spring (31), and the end of the support rod (3) abuts against the inner wall of the test tube (6); Step S4: straighten all the pull wires (33) by hand, control the pulling force so as not to drive the support rod (3) to rotate, and adjust the position of the arc tube (2) so that the length of all the pull wires (33) exposed outside the first straight tube (21) is the same; Step S5: starting the gamma-ray flaw detector (1), exposing the weld on the inner wall of the test tube (6) with the exposure head (12), and then performing inspection; Step S6: After the inspection is completed, all the pull wires (33) are pulled to rotate all the support rods (3) into the corresponding embedding grooves (32), and the arc tube (2) is pulled out of the process hole (61).

8. The detection process for exposure of the inner wall of the pipeline butt weld according to claim 7 is characterized by: In step S2, the two magnet plates (51) of the support frame (5) contact the outer walls of the test tube (6) on both sides of the process hole (61).

9. The detection process for exposure of inner wall of pipeline butt weld according to claim 7, characterized in that: In step S2, before inserting the arc tube (2) into the process hole (61), the exposure head (12) is rotated to tighten the coil spring (14), so that the exposure head (12) rotates under the action of the coil spring (14) and the damping shaft (13).

10. The detection process for exposure of inner wall of pipeline butt weld according to claim 7, characterized in that: The method further comprises step S7: installing a plug or a valve on the process hole (61).

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