Ultrasonic detection device for defects of pipe fitting

Abstract

The invention discloses a pipe fitting defect ultrasonic detection device, which comprises two end part fixing assemblies fixedly connected to openings at two ends of a detected pipe fitting respectively and locked and fixed through an axial connecting assembly; the two rotating pieces are rotationally connected to the corresponding end fixing assemblies respectively, and a circumferential graduated scale is arranged between at least one rotating piece and the corresponding end fixing assembly; the axial rod piece is movably arranged on the two rotating pieces in a penetrating mode and is configured to axially move relative to the rotating pieces and the end fixing assembly and can also drive the rotating pieces to rotate in the circumferential direction relative to the end fixing assembly; an axial graduated scale is arranged on the axial rod piece; the ultrasonic detection assembly is arranged on the axial rod piece and synchronously moves along with the axial rod piece, and the detection end of the ultrasonic detection assembly movably abuts against the inner cavity wall of the detected pipe fitting. According to the invention, accurate control and accurate positioning in a circumferential direction and an axial direction in a detection process are ensured, and the accuracy and effectiveness of a detection result are improved.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic detection, and in particular to an ultrasonic detection device for pipe defects. Background Art

[0002] The introduction and application of direct pressure vessel injection (DVI) technology in nuclear power plants has brought about additional large stresses, and more stringent requirements have been put forward for the structural integrity of the parent material area under the cladding layer on the inner wall of the DVI nozzle of the reactor pressure vessel (RPV) (beyond the requirements of the standard specification RCC-M or ASME). It is necessary to implement quality inspection and quantitative acceptance of this area through highly reliable non-destructive testing to ensure the safety and reliability of the newly added DVI nozzle components. The DVI nozzle has a small diameter, many inner wall diameter changes, and a long axial length. The conventional inspection method is that the inspector uses a handheld ultrasonic probe of different angles or frequencies to scan the inner wall of the nozzle in the circumferential and axial positive and negative directions (a total of four directions) to find possible crack defects under the cladding layer (there is randomness in the direction of crack growth), thereby realizing the quality inspection and acceptance of the parent material under the cladding layer on the inner wall of the nozzle.

[0003] However, the handheld inspection process is seriously affected by human factors, and it cannot ensure that the ultrasonic probe always strictly scans in the circumferential and axial directions. It is very easy to miss detections and misjudge due to human errors, which affects the accuracy of the inspection results. In addition, due to the small inner diameter of the pipe, it is not conducive to the insertion of auxiliary positioning devices and dimension measuring devices. During the handheld inspection operation, it is difficult to accurately measure the position and size of the defect display. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides an ultrasonic detection device for pipe defects, which solves the technical problems of inaccurate detection results of handheld detection operations, and the difficulty in accurately measuring the position and size of defect displays. The present application ensures accurate control and precise positioning in a single direction of circumferential and axial directions during the detection process, and improves the accuracy and effectiveness of the detection results.

[0005] The present application provides an ultrasonic detection device for defects in pipe fittings, the detection device comprising: two end fixing assemblies, which are respectively fixedly connected to the openings at both ends of the pipe fitting to be tested and locked and fixed by an axial connection assembly; two rotating members, which are respectively rotatably connected to the corresponding end fixing assemblies, and a circumferential scale is provided between at least one of the rotating members and the corresponding end fixing assembly; an axial rod, which is movably passed through the two rotating members, and the axial rod is configured to be axially movable along the central axis of the pipe fitting to be tested relative to the rotating member and the end fixing assembly, and can also drive the rotating member to rotate circumferentially around the central axis relative to the end fixing assembly; an axial scale is provided on the axial rod; an ultrasonic detection assembly is arranged on the axial rod and moves synchronously with it, and the detection end of the ultrasonic detection assembly is movably abutted against the inner cavity wall of the pipe fitting to be tested.

[0006] In some embodiments, the end fixing assembly is provided with a hollow area corresponding to the inner cavity of the measured pipe fitting, and the rotating member at least partially closes the corresponding hollow area; the circumferential scale includes: an inner circumferential scale, which is arranged around the inner circumference of the hollow area and on the outer end surface of the rotating member exposed in the hollow area; and an outer circumferential scale, which is arranged around the outer circumference of the hollow area on the outer end surface of the end fixing assembly.

[0007] In some embodiments, both ends of the axial rod are movably extended out of the corresponding hollow area, and the scale size of the axial scale exposed in the hollow area is consistent with the axial movement length of the axial rod relative to the rotating member.

[0008] In some embodiments, the detection device further includes: an observation port, which is opened at a position where the rotating member is exposed in the hollow area, and is used to observe the ultrasonic detection component from the outside.

[0009] In some embodiments, at least two observation ports are provided on each of the rotating members, and all of the observation ports are evenly distributed circumferentially around the central axis.

[0010] In some embodiments, each of the end fixing components includes: an end cap, which is detachably sleeved on an axial opening at one end of the measured pipe fitting, and an axially concave receiving groove is provided on the outer end surface of the end cap facing away from the opening of the measured pipe fitting; the hollow area includes a bottom surface passing through the receiving groove and a hollow area A provided on the end cap; an end cover, which is detachably connected to the outer end surface of the end cap and at least partially closes the receiving groove; the hollow area includes a hollow area B provided through the end cover, and the hollow area B is provided corresponding to the hollow area A; the rotating member is accommodated in the receiving groove, and is at least partially axially stopped by the end cover and at least partially axially stopped by the end cap.

[0011] In some embodiments, the receiving groove is a circular groove coaxial with the measured pipe fitting, and the slot size of the receiving groove is not smaller than the inner diameter size of the opening at the corresponding end of the measured pipe fitting; the hollow area A is a circular hollow area coaxial with the receiving groove, and the opening size of the hollow area A is larger than the inner diameter size of the opening at the corresponding end of the measured pipe fitting and smaller than the slot size of the receiving groove, so as to form an annular stop portion at the outer end of the end cap that can axially stop the measured pipe fitting; the hollow area B is arranged coaxially with the hollow area A.

[0012] In some embodiments, the rotating member is configured as a circular structure that matches the inner cavity of the accommodating groove; or the rotating member is configured as a regular polygonal structure inscribed in the inner cavity wall of the accommodating groove, and the thickness of the rotating member of the regular polygonal structure is consistent with the axial concave depth of the accommodating groove.

[0013] In some embodiments, each of the rotating parts is provided with a through-interface, which is a polygonal opening, axially passing through the center position of the rotating part, and the through-interface is arranged coaxially with the pipe to be measured; the axial rod is a polygonal column structure, the shape of the vertical cross-section of the axial rod is consistent with the through-interface, and the axial rod is axially movably inserted into the rotating part through the through-interface.

[0014] In some embodiments, the detection device also includes: a first locking member, threadedly connected to at least one of the end fixing components and at least partially stopped by the corresponding rotating member, the first locking member being configured to lock and fix the rotating member relative to the end fixing component so that the rotating member has a preset circumferential rotation angle relative to the end fixing component.

[0015] In some embodiments, the detection device also includes: a second locking member, threadedly connected to at least one of the rotating members and at least partially stopped by the axial rod, the second locking member being configured to lock and fix the axial rod relative to the rotating member so that the axial rod has a preset axial movement length relative to the rotating member.

[0016] In some embodiments, the detection device also includes: a crank connected to one end of the axial rod extending outside the rotating member and the end fixing assembly, and the crank is configured to drive the axial rod to move axially along the central axis and drive the axial rod to rotate circumferentially around the central axis.

[0017] In some embodiments, the axial connection assembly includes: at least two axial connecting rods, evenly distributed on the outside of the pipe wall of the pipe to be measured, and with both ends axially passing through the corresponding end fixing assemblies; fasteners, respectively connected to the corresponding axial connecting rods to fix and clamp the two end fixing assemblies on the pipe to be measured.

[0018] In some embodiments, the ultrasonic detection assembly includes: a fixed tube, detachably connected to the axial rod; a movable rod, movably connected to the fixed tube, and telescopically movable relative to the fixed tube along the radial direction of the measured pipe; an elastic connecting member, elastically connected between the fixed tube and the movable rod, and configured to elastically drive the movable rod to move toward the inner cavity wall of the measured pipe; an ultrasonic probe, detachably connected to one end of the movable rod facing the inner cavity wall of the measured pipe, and the detection end of the ultrasonic probe adaptively abuts against the inner cavity wall of the measured pipe.

[0019] In some embodiments, the ultrasonic detection assembly further includes: a clamp fixedly connected to the outer end of the movable rod extending out of the fixed tube, and the ultrasonic probe is detachably connected to the movable rod through the clamp.

[0020] The detection device provided in the present application realizes ultrasonic defect detection of pipe fittings with small diameter, multiple inner wall diameter changes and long axial length (such as DVI pipe fittings), ensures accurate control and precise positioning in a single circumferential and axial direction during the detection process, realizes precise positioning and quantification of the circumferential and axial positions of the defective areas found during the detection, avoids problems such as missed detection, false detection and misjudgment caused by manual handheld detection, significantly improves the accuracy and effectiveness of the detection results, and realizes reliable non-destructive detection of the parent material under the weld overlay on the inner wall of the DVI pipe fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 creative work. In the drawings:

[0022] Figure 1 It is a schematic diagram of the overall structure of one embodiment of the detection device of the present application;

[0023] Figure 2 It is a schematic cross-sectional structure diagram of one embodiment of the detection device of the present application;

[0024] Figure 3 yes Figure 2 A magnified schematic diagram of the local structure at S1 in the middle;

[0025] Figure 4 yes Figure 2 A magnified schematic diagram of the local structure at S2 in the figure.

[0026] The reference numerals are as follows:

[0027] 100-tested pipe fitting, 101-central axis, 200-fixed tooling, 10-hollow area, 1-end fixing assembly, 11-end cap, 111-accommodating groove, 112-hollow area A, 113-annular stopper, 114-fixed support arm, 1141-through hole, 12-end cover, 121-hollow area B, 122-first threaded hole, 13-threaded fastener, 2-rotating part, 21-observation port, 22-through port, 23-fixed part, 231-second threaded hole, 3-axial rod, 31-axial scale, 4-ultrasonic detection assembly, 41- Fixed cylinder, 411-first opening, 412-through hole, 42-movable rod, 421-connecting part, 422-rod, 43-elastic connecting member, 44-ultrasonic probe, 45-pressure cover, 46-clamp, 461-clamping claw, 4611-third threaded hole, 462-third locking member, 5-axial connecting assembly, 51-axial connecting rod, 52-fastener, 6-circumferential scale, 61-inner scale, 62-outer scale, 7-first locking member, 71-first butterfly locking screw, 8-second locking member, 81-second butterfly locking screw, 9-crank. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0029] See also Figure 1 The present application provides an ultrasonic detection device for pipe defects, which includes two end fixing components 1, two rotating components 2, an axial rod 3, and an ultrasonic detection component 4. The two end fixing components 1 are respectively fixedly connected to the pipe 100 to be tested (such as Figure 2 The two end openings of the axial connection assembly 5 are locked and fixed.

[0030] The two rotating parts 2 are respectively rotatably connected to the corresponding end fixing components 1. A circumferential scale 6 is provided between the outer end surface of at least one rotating part 2 and the outer end surface of the corresponding end fixing component 1. The circumferential scale 6 is configured to measure the circumferential rotation angle of the rotating part 2 relative to the end fixing component 1.

[0031] The axial rod 3 is movably disposed through the two rotating members 2, and the axial rod 3 is configured to be able to axially move relative to the rotating member 2 and the end fixing assembly 1 along the central axis 101 of the measured pipe 100, and can also drive the rotating member 2 to rotate circumferentially around the central axis 101 relative to the end fixing assembly 1. An axial scale 31 is provided on the axial rod 3, and the axial scale 31 is configured to measure the length of the axial movement of the axial rod 3 relative to the rotating member 2.

[0032] During the axial movement of the axial rod 3 relative to the rotating member 2 and the end fixing assembly 1 along the central axis 101, the rotating member 2, the end fixing assembly 1 and the measured pipe fitting 100 are relatively stationary, and no circumferential and axial relative displacement will occur; during the axial rod 3 driving the rotating member 2 to rotate circumferentially around the central axis 101 relative to the end fixing assembly 1, the axial rod 3, the rotating member 2, the end fixing assembly 1 and the measured pipe fitting 100 are relatively stationary in the axial direction, and no axial relative displacement will occur.

[0033] The ultrasonic detection assembly 4 is disposed on the axial rod 3 and moves synchronously with the axial rod 3 . The detection end of the ultrasonic detection assembly 4 movably abuts against the inner cavity wall of the pipe 100 to be detected.

[0034] The detection device provided in the present application can fix the two end fixing components 1 to the openings at both ends of the pipe 100 to be tested (such as a DVI tube with a small diameter, multiple inner wall diameter changes, and a long axial length) through an axial connecting component 5 to adapt to DVI tubes of different specifications and lengths, and lock and fix the end fixing components 1 and the DVI tube to ensure that the three can remain relatively still during the entire detection process, providing a more stable and reliable environment for the circumferential scanning and axial scanning of the ultrasonic detection component 4.

[0035] Moreover, the rotating member 2 is rotatably connected to the corresponding end fixing assembly 1, so that the axial rod 3 can drive the ultrasonic detection assembly 4 and the two rotating members 2 to rotate circumferentially relative to the end fixing assembly 1 and the DVI tube around the central axis 101, thereby realizing a single-direction scan of the entire circumference of a certain axial position of the DVI tube, thereby avoiding the ultrasonic detection assembly 4 from moving in both the circumferential and axial directions during the scanning process, thereby ensuring the stability and reliability of the circumferential scanning. Moreover, the axial rod 3 can move axially along the central axis 101 of the measured pipe 100 relative to the rotating member 2 and the end fixing assembly 1, thereby realizing a single-direction scan of the entire axial length of the DVI tube at a certain circumferential angle position, thereby avoiding the ultrasonic detection assembly 4 from moving in both the axial and circumferential directions during the scanning process, thereby ensuring the stability and reliability of the axial scanning. Combined with the circumferential and axial movements of the axial rod 3, a comprehensive scan of the entire inner cavity wall of the DVI tube can be achieved, and the consistency of each scanning direction, the stability of multi-dimensional scanning and the reliability of scanning are guaranteed, avoiding the problems of missed detection and false detection during manual handheld detection, and ensuring the accuracy of the detection results.

[0036] In addition, the detection device provided in the present application can accurately measure the circumferential rotation angle of the rotating part 2 relative to the end fixing component 1 and the DVI tube through the circumferential scale 6, thereby determining the specific circumferential positions of the axial rod 3 and the ultrasonic detection component 4 relative to the inner cavity wall of the DVI tube, and can accurately measure the axial movement length of the axial rod 3 relative to the rotating part 2 and the DVI tube through the axial scale 31, thereby determining the specific axial position of the ultrasonic detection component 4 relative to the inner cavity wall of the DVI tube, thereby achieving precise positioning of the detected defective area, and can further determine the size of the defective area in combination with the degrees of the circumferential scale 6 and the axial scale 31, thereby achieving quantitative detection of the defective area.

[0037] The detection device provided in the present application realizes ultrasonic defect detection of pipe fittings with small diameter, multiple inner wall diameter changes and long axial length (such as DVI pipe fittings), ensures accurate control and precise positioning in a single circumferential and axial direction during the detection process, realizes precise positioning and quantification of the circumferential and axial positions of the defective areas found during the detection, avoids problems such as missed detection, false detection and misjudgment caused by manual handheld detection, significantly improves the accuracy and effectiveness of the detection results, and realizes reliable non-destructive detection of the parent material under the weld overlay on the inner wall of the DVI pipe fitting.

[0038] In the following embodiments, the tested pipe fitting 100 is illustrated by taking the DVI nozzle of the reactor pressure vessel (RPV) as an example. The DVI nozzle has a small diameter, many inner wall diameter changes, and a long axial length. The detection device provided in the present application can be used to perform ultrasonic detection on the structural integrity of the parent material area under the weld overlay layer on the inner wall of the DVI nozzle to detect possible crack defects under the weld overlay, thereby achieving quality inspection and acceptance of the parent material under the weld overlay layer on the inner wall of the DVI nozzle.

[0039] Since the inner wall of the DVI tube has many diameter changes, the outer wall sizes of the two axial ends thereof are greatly different, presenting a shape in which the first end is relatively thinner (the corresponding inner diameter is relatively smaller) and the second end is relatively thicker (the corresponding inner diameter is relatively larger). The two end fixing components 1 are arranged relatively to each other and are structurally consistent. They can be set to have different sizes to adapt to the different sizes of the outer walls of the two ends of the DVI tube.

[0040] The circumferential scale ruler 6 can be set only between one of the rotating parts 2 and the corresponding end fixing assembly 1, or it can be set between each rotating part 2 and the corresponding end fixing assembly 1. The present application does not limit this. The circumferential scale ruler 6 can be used to accurately measure the circumferential rotation angle of the rotating part 2 relative to the end fixing assembly 1.

[0041] Similarly, the axial scale ruler 31 can be set only at one end of the axial rod 3 that is movably inserted into the rotating member 2, or it can be set at both ends of the axial rod 3 that are movably inserted into the rotating member 2. The present application does not limit this. The axial scale ruler 31 can be used to accurately measure the axial movement length of the axial rod 3 relative to the rotating member 2.

[0042] See also Figure 2 In actual testing, the DVI pipe can be fixedly connected to a fixed fixture 200 (such as an I-beam) with a horizontal surface, and the central axis 101 of the DVI pipe extends along the X-axis of the horizontal surface to ensure that the DVI pipe and the end fixing assembly 1 will not be displaced during the entire testing process. In the circumferential initial state, that is, when the circumferential rotation angle of the rotating member 2 relative to the end fixing assembly 1 is 0°, the ultrasonic detection assembly 4 preferably extends along the Z-axis, and the Z-axis direction is consistent with the gravity direction, so that the detection end of the ultrasonic detection assembly 4 in the circumferential initial state abuts against the inner cavity wall of the DVI pipe along the set radial direction.

[0043] See also Figure 1In some embodiments, the end fixing assembly 1 is provided with a hollow area 10 at the inner cavity corresponding to the measured pipe 100 (such as a DVI pipe), and the rotating member 2 at least partially closes the corresponding hollow area 10. The circumferential scale 6 includes an inner scale 61 and an outer scale 62. The inner scale 61 is arranged around the inner circumference of the hollow area 10 on the outer end surface of the rotating member 2 exposed in the hollow area 10. The outer scale 62 is arranged around the outer circumference of the hollow area 10 on the outer end surface of the end fixing assembly 1. The minimum range of the inner scale 61 and the outer scale 62 can be set to 1° to ensure accurate measurement of the circumferential rotation angle.

[0044] The hollow area 10 is arranged to correspond to the inner cavity of the pipe 100 to be tested, and the rotating part 2 at least partially closes the corresponding hollow area 10, so that the structure of the detection device of the present application at both axial ends of the pipe 100 to be tested is more compact, and the setting of the hollow area 10 also facilitates the observation of the relative movement between the rotating part 2 and the end fixing assembly 1 in the circumferential direction, facilitates the disassembly and assembly of the detection device on the pipe 100 to be tested, and improves the convenience of detection.

[0045] The inner scale 61 and the outer scale 62 of the circumferential scale ruler 6 are respectively provided on the rotating member 2 and the end fixing assembly 1, and are arranged correspondingly around the inner and outer circumferences of the hollow area 10. During the actual inspection operation, the inspector can observe the circumferential scale ruler 6 from the outside of the first end or the second end of the DVI tube through the corresponding hollow area 10, and then intuitively confirm the circumferential rotation angle of the rotating member 2 relative to the end fixing assembly 1 through the difference between the inner scale 61 and the outer scale 62, thereby improving the circumferential positioning accuracy and also improving the accuracy of positioning and quantification of defective areas found during the scanning process.

[0046] See also Figure 1 In some embodiments, both ends of the axial rod 3 are movably extended out of the corresponding hollow area 10, and the scale size of the axial scale 31 exposed in the hollow area 10 is consistent with the axial movement length of the axial rod 3 relative to the rotating member 2.

[0047] The total length of the axial rod 3 needs to ensure that during the reciprocating movement along the central axis 101, it can drive the ultrasonic detection component 4 to complete the entire axial scanning and inspection of the inner cavity wall of the DVI tube. During the actual axial scanning and inspection, the axial rod 3 can drive the ultrasonic detection component 4 to perform continuous axial scanning from one end of the inner cavity wall of the DVI tube to the other end, or the axial rod 3 can drive the ultrasonic detection component 4 to scan independently from the middle of the inner cavity wall of the DVI tube to both ends. The present application does not limit this, and it is sufficient to complete the entire axial scanning and inspection of the tested pipe 100 through at least one axial movement of the axial rod 3.

[0048] The minimum measuring range of the axial scale 31 can be set to 1mm to ensure accurate measurement of the axial movement length. The scale size of the axial scale 31 exposed in the hollow area 10 is consistent with the axial movement length of the axial rod 3 relative to the rotating member 2, so that the inspection personnel can visually confirm the axial movement length of the axial rod 3 from the outside, which is convenient for accurate axial positioning of the defects found and detailed scanning.

[0049] See also Figure 1 and Figure 2 In some embodiments, the detection device further includes an observation port 21 , which is opened at a position where the rotating member 2 is exposed in the hollow area 10 , and is used to observe the ultrasonic detection component 4 from the outside.

[0050] The observation port 21 may be provided on only one of the rotating members 2, or may be provided on both rotating members 2 at the same time; each rotating member 2 may be provided with only one observation port 21, or may be provided with two or more observation ports 21 at the same time, and the plurality of observation ports 21 may be evenly distributed on the rotating member 2 around the central axis 101. In this embodiment, four observation ports 21 are provided on each rotating member 2, and the four observation ports 21 are evenly distributed around the central axis 101.

[0051] Preferably, at least two observation ports 21 are provided on each rotating member 2, and all the observation ports 21 are evenly distributed circumferentially around the central axis 101 of the pipe 100 to be tested, to ensure that during the testing process, the tester can observe the circumferential and axial movement of the ultrasonic detection component 4 inside the pipe, as well as the contact between the detection end of the ultrasonic detection component 4 and the inner cavity wall of the DVI tube from the outside of any rotating member 2 through the corresponding observation ports 21 provided at appropriate positions, so as to facilitate timely correction when the movement of the ultrasonic detection component 4 is abnormal or the coupling contact between the detection end and the inner cavity wall is poor, so as to ensure the reliability and effectiveness of the ultrasonic testing.

[0052] See also Figures 1 to 3 In some embodiments, each end fixing assembly 1 includes an end cap 11 and an end cover 12. The end cap 11 is detachably sleeved on an axial opening of a pipe 100 (such as a DVI pipe) to be tested. An axially concave receiving groove 111 is provided on the outer end surface of the opening of the pipe 100 to be tested. The hollow area 10 includes a bottom surface that passes through the receiving groove 111 and a hollow area A112 (such as a hollow area 112) provided on the end cap 11. Figure 3 ).

[0053] The end cover 12 can be detachably connected to the outer end surface of the end cap 11 by means of a threaded fastener 13 (such as a screw), and the end cover 12 at least partially closes the receiving groove 111. The hollow area 10 includes a hollow area B121 (such as Figure 3As shown in ), the hollow area B121 is set corresponding to the hollow area A112.

[0054] The rotating member 2 is received in the corresponding receiving groove 111 of the end fixing assembly 1 , and the rotating member 2 is at least partially axially stopped by the end cover 12 and at least partially axially stopped by the end cap 11 .

[0055] The receiving groove 111 is preferably a circular groove coaxial with the tested pipe 100, and the slot size of the receiving groove 111 is preferably not less than the inner diameter size of the opening at the corresponding end of the tested pipe 100. The hollow area A112 is preferably a circular hollow area coaxial with the receiving groove 111, and the opening size of the hollow area A112 is larger than the inner diameter size of the opening at the corresponding end of the tested pipe 100 and smaller than the slot size of the receiving groove 111, so as to form an annular stopper 113 (such as Figure 1 ), the annular stopper 113 isolates the rotating member 2 from the tested pipe 100, ensuring that the end cap 11 can be axially sleeved at the end opening of the tested pipe 100 and locked and fixed by the axial connection assembly 5, while avoiding contact between the rotating member 2 and the tested pipe 100, ensuring that the rotating member 2 can freely rotate around the central axis 101 relative to the end fixing assembly 1 and the tested pipe 100. The hollow area B121 is preferably a circular hollow area with the same opening size as the hollow area A112, and the hollow area B121 is coaxially arranged with the hollow area A112.

[0056] The rotating member 2 is preferably configured as a circular structure that matches the inner cavity of the accommodating groove 111, that is, the outer diameter of the rotating member 2 is consistent with the slot size of the accommodating groove 111, and the thickness of the rotating member 2 is consistent with the axial recess depth of the accommodating groove 111, so as to ensure that the rotating member 2 will not have radial and axial movement during the rotation relative to the end fixing component 1, thereby ensuring the stability and reliability of the circumferential rotation of the ultrasonic detection component 4 relative to the inner cavity wall of the pipe 100 under test during the circumferential scanning inspection.

[0057] It can be understood that in some other embodiments, the rotating member 2 can also be configured as a regular polygonal structure (such as a regular triangle structure, a square structure, a regular hexagonal structure, etc.) that is inscribed in the inner cavity wall of the accommodating groove 111, and the thickness of the rotating member 2 with the regular polygonal structure is consistent with the axial concave depth of the accommodating groove 111, so that the rotating member 2 can rotate stably circumferentially around the central axis 101 relative to the end fixing assembly 1 and the measured pipe fitting 100.

[0058] See also Figure 3In some embodiments, each rotating member 2 is provided with a through-hole 22, which is preferably a polygonal opening, axially passing through the center of the rotating member 2, and the through-hole 22 is arranged coaxially with the pipe 100 to be tested. The axial rod 3 is preferably a multi-prism structure, and the shape of the vertical cross-section of the axial rod 3 is consistent with the through-hole 22, so that the axial rod 3 can be axially movably penetrated in the rotating member 2 through the through-hole 22. In this way, when the axial rod 3 rotates circumferentially around the central axis 101 of the pipe 100 to be tested, the rotating member 2 can be driven to rotate synchronously relative to the end fixing assembly 1 through the through-hole 22. In addition, when the axial rod 3 moves axially back and forth along the central axis 101 of the pipe 100 to be tested, the rotating member 2 is stopped by the end cover 12 and the end cap 11 of the corresponding end fixing assembly 1, and will not move axially with the axial rod 3, thereby ensuring the axial static state between the rotating member 2 and the end fixing assembly 1 during the axial scanning and detection process.

[0059] In this embodiment, the opening shape of the through hole 22 is a square, and accordingly, the vertical cross section of the axial rod 3 is set to be a square that matches the through hole 22, that is, the axial rod 3 is a quadrangular prism structure with a square vertical cross section. In order to reduce the overall weight of the axial rod 3, it can be set to a hollow square tube structure.

[0060] The axial rod 3 of the square tube structure has four side wall surfaces, and the axial scale 31 can be set on any one or more of the side wall surfaces, so that the inspection personnel can directly observe the axial scale 31 from an appropriate direction.

[0061] See also Figure 1 In some embodiments, the detection device also includes a first locking member 7, which is threadedly connected to at least one end fixing component 1 and at least partially stopped by the corresponding rotating member 2. The first locking member 7 is configured to lock and fix the rotating member 2 relative to the end fixing component 1 so that the rotating member 2 has a preset circumferential rotation angle relative to the end fixing component 1.

[0062] Since the rotating member 2 can rotate freely around the central axis 101 of the pipe 100 to be tested relative to the end fixing assembly 1, in order to ensure the stability and reliability of the axial scanning, when scanning the entire axial length at a certain circumferential angle position of the DVI tube, the rotating member 2 can be locked and fixed relative to the end fixing assembly 1 by the first locking member 7 to prevent the circumferential relative movement between the two. Before locking and fixing, the ultrasonic detection assembly 4 can be accurately adjusted to a preset circumferential rotation angle relative to the inner cavity wall of the DVI tube by measuring the circumferential scale 6 to complete the single-direction scanning of the entire axial length at a certain circumferential angle position of the inner cavity wall of the DVI tube, avoiding the circumferential movement problem during the axial scanning detection process, and ensuring the stability and reliability of the axial scanning.

[0063] The first locking member 7 can be arranged only between one of the end fixing components 1 and the corresponding rotating member 2, or between each end fixing component 1 and the corresponding rotating member 2; only one first locking member 7 can be arranged between the end fixing component 1 and the corresponding rotating member 2, or multiple first locking members 7 can be arranged at the same time. The present application does not limit this. The first locking member 7 can be used to lock and fix the rotating member 2 relative to the end fixing component 1 so that the rotating member 2 can have a preset circumferential rotation angle relative to the end fixing component 1.

[0064] See also Figures 2 to 3 In some embodiments, the first locking member 7 includes a first butterfly locking screw 71 that is convenient for manual screwing operation, and the end cover 12 of the end fixing assembly 1 is provided with at least one first threaded hole 122 (such as Figure 1 As shown in , the first threaded hole 122 is provided axially through the end cover 12, and the first butterfly locking screw 71 is threadedly connected to the corresponding first threaded hole 122, so that the end of the first butterfly locking screw 71 can abut against the corresponding outer end surface of the rotating member 2 through the first threaded hole 122. When scanning the entire axial length of the DVI tube at a certain circumferential angle position, the inspector can adjust the circumferential rotation angle of the rotating member 2 relative to the end fixing assembly 1, and then manually tighten the first butterfly locking screw 71 to lock and fix the rotating member 2 relative to the end fixing assembly 1. After completing the scan, the operator can manually loosen the first butterfly locking screw 71 to release the restriction of the first locking member 7 on the rotating member 2, so that the rotating member 2 can rotate circumferentially around the central axis 101 of the DVI tube relative to the end fixing assembly 1. The structure is simple, the operation is convenient, and the detection efficiency is improved.

[0065] Preferably, at least one first threaded hole 122 is provided on the end cap 12 of each end fixing assembly 1, and a first butterfly locking screw 71 is threadedly connected to each first threaded hole 122. In this way, the two rotating members 2 can be locked and fixed at the same time by the first locking member 7, further improving the effect of circumferential locking of the rotating member 2.

[0066] The present application configures the first locking member 7 as a first butterfly locking screw 71 axially threadedly connected to the end cover 12. On the one hand, it is convenient for the inspector to manually operate and improves the operational convenience. On the other hand, the end of the first butterfly locking screw 71 can be locked and fixed at any position on the corresponding circumferential direction of the outer end surface of the rotating member 2, so that any adjustment of the circumferential rotation angle of the rotating member 2 relative to the end fixing assembly 1 can be realized.

[0067] See also Figure 1In some embodiments, the detection device also includes a second locking member 8, which is threadedly connected to at least one rotating member 2 and at least partially stopped by the axial rod 3. The second locking member 8 is configured to lock and fix the axial rod 3 relative to the rotating member 2 so that the axial rod 3 has a preset axial movement length relative to the rotating member 2.

[0068] Since the axial rod 3 can move freely along the central axis 101 of the pipe 100 to be tested relative to the rotating member 2, in order to ensure the stability and reliability of the circumferential scanning, when scanning the entire circumference at a certain axial position of the DVI tube, the axial rod 3 can be locked and fixed relative to the rotating member 2 by the second locking member 8 to prevent the axial relative movement between the two. Before locking and fixing, the ultrasonic detection component 4 can be accurately adjusted to a preset axial movement length relative to the inner cavity wall of the DVI tube by measuring the axial scale 31 to complete the single-direction scanning of the entire circumference at a certain axial position of the inner cavity wall of the DVI tube, avoiding the axial movement problem in the circumferential scanning detection process, and ensuring the stability and reliability of the circumferential scanning.

[0069] The second locking member 8 can be arranged only between one of the rotating members 2 and the axial rod 3, or between each rotating member 2 and the axial rod 3; only one second locking member 8 can be arranged between a single rotating member 2 and the axial rod 3, or multiple second locking members 8 can be arranged at the same time. The present application does not make any limitation on this. The second locking member 8 can be used to lock and fix the axial rod 3 relative to the rotating member 2 so that the axial rod 3 can move a preset axial length relative to the rotating member 2.

[0070] See also Figures 2 to 3 In some embodiments, the second locking member 8 includes a second butterfly locking screw 81 that is convenient for manual screwing operation. The outer end surface of the rotating member 2 exposed in the hollow area B121 is provided with at least one axially extending fixing portion 23. The fixing portion 23 can be set as a strip-shaped structure, which is arranged near the through-hole 22, and the fixing portion 23 is arranged parallel to one side wall of the axial rod 3. The fixing portion 23 is provided with at least one second threaded hole 231 that cooperates with the second butterfly locking screw 81. The second threaded hole 231 is arranged through the fixing portion 23, and the second threaded hole 231 is perpendicular to the corresponding side wall of the axial rod 3. The second butterfly locking screw 81 is threadedly connected to the corresponding second threaded hole 231, so that the end of the second butterfly locking screw 81 can abut against the corresponding side wall of the axial rod 3 through the second threaded hole 231.

[0071] When scanning the entire circumference of a certain axial position of the DVI tube, after the inspection personnel have adjusted the axial movement length of the axial rod 3 relative to the rotating member 2, they can manually tighten the second butterfly locking screw 81 to lock and fix the axial rod 3 relative to the rotating member 2. After completing the scanning, the operator can manually loosen the second butterfly locking screw 81 to release the restriction of the second locking member 8 on the axial rod 3, so that the axial rod 3 can rotate axially relative to the rotating member 2 along the central axis 101 of the DVI tube. The structure is simple, the operation is convenient, and the inspection efficiency is improved.

[0072] Preferably, at least one fixing portion 23 is disposed on the outer end surface of each rotating member 2 exposed in the hollow area B121, and at least one second threaded hole 231 is disposed on each fixing portion 23, and a second butterfly locking screw 81 is threadedly connected to each second threaded hole 231. In this way, the axial rod 3 and the two rotating members 2 can be locked and fixed at the same time by the second locking member 8, further improving the axial locking effect of the axial rod 3.

[0073] The present application configures the second locking member 8 as a second butterfly locking screw 81 which is radially threadedly connected to the rotating member 2. On the one hand, it is convenient for the inspector to operate manually, thereby improving the operational convenience. On the other hand, the end of the second butterfly locking screw 81 can be locked and fixed at any axial position on the corresponding side wall surface of the axial rod 3, thereby realizing any adjustment of the axial movement length of the axial rod 3 relative to the rotating member 2.

[0074] In some other embodiments, a plurality of fixing portions 23 may be provided on the outer end surface of the rotating member 2 exposed in the hollow area B121. The number of the fixing portions 23 is preferably consistent with the number of the side wall surfaces of the axial rod 3. The plurality of fixing portions 23 are connected to each other in the circumferential direction of the rotating member 2 to form a polygonal tubular structure sleeved on the axial rod 3. The polygonal tubular structure can limit the axial movement of the axial rod 3 along the central axis 101 of the measured pipe 100, thereby improving the stability and reliability of the active connection between the axial rod 3 and the rotating member 2 through the polygonal tubular structure.

[0075] See also Figure 1 to Figure 2 In some embodiments, the detection device also includes a crank 9, which is connected to one end of the axial rod 3 extending outside the rotating member 2 and the end fixing assembly 1, and the crank 9 is configured to drive the axial rod 3 to move axially along the central axis 101 and drive the axial rod 3 to rotate circumferentially around the central axis 101.

[0076] During actual detection operations, the detection personnel can manually control the axial rod 3 through the crank 9 to drive the ultrasonic detection component 4 and the rotating member 2 to rotate circumferentially around the central axis 101 relative to the end fixing component 1 and the tested pipe 100, or can manually control the axial rod 3 through the crank 9 to drive the ultrasonic detection component 4 to move axially along the central axis 101 relative to the rotating member 2, the end fixing component 1, and the tested pipe 100, thereby improving the convenience of the detection operation.

[0077] See also Figure 1 In some embodiments, the crank 9 can be set to a crank-type structure similar to a "Z" shape, one end of the crank 9 is axially fixedly connected to one end of the axial rod 3 extending outside the rotating member 2 and the end fixing assembly 1, and the inspector operates the crank 9 from the corresponding end of the tested pipe 100 during operation. In order to facilitate the inspector to accurately adjust the specific position of the ultrasonic detection assembly 4 relative to the tested pipe 100 from the end where the crank 9 is provided, the circumferential scale 6, the axial scale 31, the first locking member 7, and the second locking member 8 are preferably provided at the same end as the crank 9, so that the scale can be directly observed and the locking member can be manually operated.

[0078] See also Figure 1 and Figure 2 In some embodiments, the crank 9 can be fixedly connected to the left end of the axial rod 3 extending along the X-axis direction to the outside of the rotating member 2 and the end fixing assembly 1. The circumferential scale 6 is preferably arranged between the outer end surface of the corresponding rotating member 2 at the first end (left end) of the DVI tube and the outer end surface of the corresponding end fixing assembly 1, and the axial scale 31 is preferably arranged on the side wall surface of the left end of the axial rod 3.

[0079] During the circumferential scanning inspection, the axial rod 3 is locked and fixed relative to the rotating member 2 by the second locking member 8, and the axial rod 3 is made to move a preset axial length relative to the rotating member 2, and then the ultrasonic detection component 4 is adjusted to the preset axial position of the inner cavity wall of the DVI tube. In the circumferential initial state, that is, when the circumferential rotation angle of the rotating member 2 relative to the end fixing component 1 is 0°, the 0° scale line of the inner circumference scale 61 can be set to be aligned with the 0° scale line of the outer circumference scale 62, and the ultrasonic detection component 4 radially extends to the circumferential starting position of the inner cavity wall of the DVI tube. During the circumferential scanning process, the inspector drives the axial rod 3 to drive the ultrasonic detection component 4 to rotate around the central axis 101 from the circumferential starting position of the inner cavity wall of the DVI tube by shaking the crank 9. The entire circumferential scanning inspection of a certain axial position of the inner cavity wall of the tested pipe 100 can be completed by rotating 360°. When a defect is found somewhere in the base material area under the weld overlay layer on the inner wall of the DVI pipe during the circumferential scanning inspection, the position of the defect on the circumferential direction of the inner wall of the pipe 100 under test can be determined by measuring the defect area with the circumferential scale within the angle range, and then further axial scanning inspection is performed on the defect area, and the axial length of the defect area is measured with the axial scale. Then, the precise position of the defect area on the inner wall of the pipe 100 under test is obtained by combining the measurement results of the circumferential scale and the axial scale, and the size of the defect area is confirmed, so as to achieve accurate positioning and quantification of the defect.

[0080] During the axial scanning inspection, the rotating member 2 is locked and fixed relative to the end fixing assembly 1 by the first locking member 7, and the rotating member 2 is made to rotate at a preset circumferential angle relative to the end fixing assembly 1, and the ultrasonic detection assembly 4 is adjusted to the preset circumferential angle position of the inner cavity wall of the DVI tube, wherein the preset circumferential rotation angle can be the corresponding circumferential angle of the defective area found in the previous circumferential scanning inspection process relative to the inner cavity wall of the tested pipe 100. In the axial initial state, that is, when the axial movement length of the axial rod 3 relative to the rotating member 2 is 0mm, the ultrasonic detection assembly 4 can be set to be at the second end (right end) of the inner cavity wall of the DVI tube, the axial scale ruler 31 is generally in the inner cavity of the DVI tube, and the 0mm scale line of the axial scale ruler 31 is aligned with the outer end face of the corresponding rotating member 2 at the first end of the DVI tube. During the axial scanning process, the inspector drives the axial rod 3 to drive the ultrasonic detection component 4 to move from the second end of the inner cavity wall of the DVI tube to the first end of the inner cavity wall of the DVI tube by pulling the crank 9. The scale lines of the axial scale ruler 31 gradually extend out and are exposed in the hollow area 10, and the scale size of the axial scale ruler 31 exposed in the hollow area 10 is consistent with the length of the axial movement of the axial rod 3 relative to the rotating part 2, which is convenient for the inspector to accurately measure the axial movement distance of the ultrasonic detection component 4.

[0081] See also Figure 1 to Figure 2In some embodiments, the axial connection assembly 5 includes at least two axial connection rods 51 and fasteners 52. In this embodiment, three axial connection rods 51 are used as an example for description, and the pipe 100 to be tested is used as an example for description. The three axial connection rods 51 are symmetrical about the central axis 101 and are evenly distributed on the outside of the pipe wall of the DVI pipe, and the two ends of the axial connection rods 51 axially pass through the corresponding end fixing assemblies 1 and extend outward. The fasteners 52 are detachably connected to the corresponding axial connection rods 51 to fix and clamp the two end fixing assemblies 1 on the DVI pipe.

[0082] The fastener 52 cooperates with the axial connecting rod 51 to lock and fix the two end fixing assemblies 1, and the structure is simple. The fastener 52 and the axial connecting rod 51 can be set as a quick-release fastening structure like a cam handle quick-press bolt to achieve rapid disassembly and assembly of the detection device on the tested pipe 100.

[0083] See also Figure 1 to Figure 2 In some embodiments, the axial connecting rod 51 can be configured as a stud, both ends of the stud are provided with threads, and the fastener 52 is configured as a fastening nut that cooperates with the stud.

[0084] The outer side wall of the end cap 11 of each end fixing assembly 1 is provided with three fixing arms 114 evenly distributed around the central axis 101, and the fixing arms 114 extend along the radial direction of the DVI tube. A through hole 1141 is penetrated through each fixing arm 114, and the axis of the through hole 1141 is parallel to the central axis 101 of the DVI tube, and the aperture of the through hole 1141 matches the outer diameter of the stud.

[0085] During actual assembly, the two ends of the stud bolt respectively extend outward through the corresponding through-holes 1141 on the fixed support arm 114, and the fastening nuts are respectively threadedly connected to the ends of the corresponding stud bolts extending through the through-holes 1141, thereby fixing the two end fixing components 1 on the DVI connecting pipe. The structure is simple, and the disassembly and assembly are convenient, and the fixing effect of the end fixing components 1 on the pipe 100 under test is good.

[0086] See also Figure 1 to Figure 2 In some embodiments, the ultrasonic detection assembly 4 includes a fixed tube 41, a movable rod 42, and an elastic connecting member 43 (such as Figure 2 As shown in ), the ultrasonic probe 44 and the fixing tube 41 are detachably connected to the axial rod 3 to realize the detachable connection between the ultrasonic detection assembly 4 and the axial rod 3.

[0087] The movable rod 42 is movably connected to the fixed tube 41 , and telescopically moves relative to the fixed tube 41 along the radial direction of the measured pipe 100 .

[0088] The elastic connecting member 43 is elastically connected between the fixed tube 41 and the movable rod 42 , and is configured to elastically drive the movable rod 42 to move toward the inner cavity wall of the pipe 100 to be tested.

[0089] The ultrasonic probe 44 is detachably connected to one end of the movable rod 42 facing the inner wall of the pipe 100 to be tested, and the detection end of the ultrasonic probe 44 adaptively abuts against the inner wall of the pipe 100 to be tested.

[0090] The elastic connecting piece 43 utilizes its own elastic force to drive the movable rod 42 to move toward the inner wall of the measured pipe 100, and then elastically drives the detection end of the ultrasonic probe 44 to adaptively abut against the inner wall of the measured pipe 100, so that the detection end of the ultrasonic probe 44 can always maintain automatic adhesion with the inner wall of the measured pipe 100 during the entire circumferential and axial scanning and detection process, effectively avoiding the problem of poor contact between the ultrasonic probe 44 and the inner wall of the measured pipe 100 due to human factors during the manual handheld detection operation, thereby ensuring the accuracy of the detection result. In addition, the movable rod 42 is telescopically moved relative to the fixed tube 41 under the drive of the elastic force of the elastic connecting member 43, thereby realizing the telescopic change of the overall length of the ultrasonic detection assembly 4 in the radial direction of the measured pipe 100, and can adapt to the changes in the inner diameter of different inner cavity sections in the axial direction of the measured pipe 100, and maintain the automatic fit between the detection end of the ultrasonic probe 44 and the inner cavity wall of the corresponding inner cavity section, thereby ensuring a comprehensive scanning and detection of the inner cavity wall of the measured pipe diameter, and improving the accuracy and reliability of the detection results.

[0091] See also Figure 4 In some embodiments, the fixed cylinder 41 is arranged along the radial direction of the pipe 100 to be tested, and one end of the fixed cylinder 41 is provided with a first opening 411 connecting its inner cavity with the external space, and the diameter of the first opening 411 matches the inner diameter of the fixed cylinder 41, and is used to pass through the movable rod 42, the elastic connector 43 and other components. A gland 45 is detachably connected to one end of the fixed cylinder 41, and the gland 45 is used to close the first opening 411. A through hole 412 is provided at the other end of the fixed cylinder 41, and the aperture of the through hole 412 is smaller than the inner cavity diameter of the fixed cylinder 41, so as to form a stop structure at the other end of the fixed cylinder 41 to prevent the movable rod 42 from axially detaching from the fixed cylinder 41. The through hole 412 is arranged toward the inner cavity wall of the pipe 100 to be tested.

[0092] The movable rod 42 includes a connecting portion 421 and a rod portion 422 connected coaxially, wherein the connecting portion 421 is received in the inner cavity of the fixed cylinder 41, and the outer diameter of the connecting portion 421 matches the inner cavity diameter of the fixed cylinder 41. The outer diameter of the rod portion 422 matches the aperture of the through hole 412, and at least a portion of the rod portion 422 movably extends out of the fixed cylinder 41 through the through hole 412.

[0093] The ultrasonic detection assembly 4 also includes a clamp 46, which is fixedly connected to the outer end of the movable rod 42 extending out of the fixed tube 41 (that is, the rod portion 422 is away from the connecting portion 421 and extends out of the outer end of the fixed tube 41), and the ultrasonic probe 44 is detachably connected to the movable rod 42 through the clamp 46.

[0094] The elastic connector 43 may be a compression spring, which has a simple structure, low cost, and high reliability. The compression spring is accommodated in the inner cavity of the fixed tube 41, and the two ends of the compression spring are elastically abutted against the gland 45 and the connecting portion 421, respectively. Under normal conditions, the compression spring can elastically abut the connecting portion 421 to abut against the stop structure at the other end of the fixed tube 41, so that the rod portion 422 of the movable rod 42 can be pushed out of the through hole 412 at the maximum length, ensuring that the detection end of the ultrasonic probe 44 can elastically abut against the inner cavity wall of the pipe 100 to be tested.

[0095] The clamp 46 can be a universal clamp to adapt to clamping and fixing ultrasonic probes 44 of different sizes and structures; the clamp 46 can also be a special clamp designed for an ultrasonic probe 44 of a certain size and structure. The present application does not limit this. The ultrasonic probe 44 can be clamped and fixed on the movable rod 42 by the clamp 46, and the detection end of the ultrasonic probe 44 can be stably abutted against the inner cavity wall of the measured pipe 100.

[0096] See also Figure 4 In some embodiments, the clamp 46 includes at least three clamping jaws 461 in an open state, and at least three third locking members 462, each of which is provided with at least one third threaded hole 4611, and the third threaded hole 4611 is preferably provided along the radial direction of the movable rod 42. The third locking member 462 can be provided as a screw or a screw, which is respectively threadedly connected to the corresponding third threaded hole 4611 and at least partially stops the ultrasonic probe 44, so that the ultrasonic probes 44 of different sizes and structures are fixed on the clamp 46 through the third locking member 462 and the clamping jaws 461.

[0097] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An ultrasonic detection device for pipe defects, characterized in that: The detection device comprises: Two end fixing assemblies (1) are respectively fixedly connected to the openings at both ends of the pipe (100) to be tested, and are locked and fixed by an axial connection assembly (5); Two rotating members (2) are respectively rotatably connected to the corresponding end fixing components (1), and a circumferential scale (6) is provided between at least one of the rotating members (2) and the corresponding end fixing component (1); An axial rod (3) is movably arranged on the two rotating members (2), and the axial rod (3) is configured to be able to move axially along the central axis (101) of the measured pipe member (100) relative to the rotating member (2) and the end fixing assembly (1), and can also drive the rotating member (2) to rotate circumferentially around the central axis (101) relative to the end fixing assembly (1); an axial scale (31) is provided on the axial rod (3); The ultrasonic detection component (4) is arranged on the axial rod (3) and moves synchronously therewith, and the detection end of the ultrasonic detection component (4) is movably abutted against the inner cavity wall of the pipe (100) to be detected.

2. The ultrasonic detection device for pipe defects according to claim 1 is characterized in that: The end fixing assembly (1) is provided with a hollow area (10) at the inner cavity corresponding to the measured pipe (100), and the rotating member (2) at least partially closes the corresponding hollow area (10); the circumferential scale (6) comprises: An inner circumferential scale (61) is arranged around the inner circumference of the hollow area (10) and on the outer end surface of the rotating member (2) exposed outside the hollow area (10); A peripheral scale (62) is arranged on the outer end surface of the end fixing assembly (1) around the periphery of the hollow area (10).

3. The ultrasonic detection device for pipe defects according to claim 2 is characterized in that: The two ends of the axial rod (3) are movably extended out of the corresponding hollow area (10), and the scale size of the axial scale (31) exposed outside the hollow area (10) is consistent with the axial movement length of the axial rod (3) relative to the rotating member (2).

4. The ultrasonic detection device for pipe defects according to claim 3 is characterized in that: The detection device also includes: An observation port (21) is provided at a position where the rotating member (2) is exposed outside the hollow area (10) and is used for observing the ultrasonic detection assembly (4) from the outside.

5. The ultrasonic detection device for pipe defects according to claim 4 is characterized in that: At least two observation ports (21) are provided on each rotating member (2), and all the observation ports (21) are evenly distributed in the circumferential direction around the central axis (101).

6. The ultrasonic detection device for pipe defects according to claim 2, characterized in that: Each of the end fixing assemblies (1) comprises: An end cap (11) is detachably sleeved on an axial opening of the pipe (100) to be tested, and an axially concave receiving groove (111) is provided on the outer end surface of the opening of the end cap (11) facing away from the pipe (100) to be tested; the hollow area (10) includes a bottom surface penetrating the receiving groove (111) and a hollow area A (112) provided on the end cap (11); an end cover (12) detachably connected to the outer end surface of the end cap (11) and at least partially closing the accommodating groove (111); the hollow area (10) comprises a hollow area B (121) arranged through the end cover (12), and the hollow area B (121) is arranged corresponding to the hollow area A (112); The rotating member (2) is accommodated in the accommodating groove (111), and is at least partially axially stopped by the end cover (12) and at least partially axially stopped by the end cap (11).

7. The ultrasonic detection device for pipe defects according to claim 6, characterized in that: The containing groove (111) is a circular groove coaxial with the pipe (100) to be tested, and the slot size of the containing groove (111) is not less than the inner diameter size of the opening at the corresponding end of the pipe (100) to be tested; The hollow area A (112) is a circular hollow area coaxial with the containing groove (111), and the opening size of the hollow area A (112) is larger than the inner diameter size of the opening at the corresponding end of the measured pipe (100) and smaller than the slot size of the containing groove (111), so as to form an annular stopper (113) at the outer end of the end cap (11) that can axially stop the measured pipe (100); The hollow area B (121) is arranged coaxially with the hollow area A (112).

8. The ultrasonic detection device for pipe defects according to claim 7, characterized in that: The rotating member (2) is configured as a circular structure that matches the inner cavity of the accommodating groove (111); or the rotating member (2) is configured as a regular polygonal structure that is inscribed in the inner cavity wall of the accommodating groove (111), and the thickness of the rotating member (2) of the regular polygonal structure is consistent with the depth of the axial indentation of the accommodating groove (111).

9. The ultrasonic detection device for pipe defects according to claim 2, characterized in that: Each of the rotating parts (2) is provided with a penetration port (22), the penetration port (22) being a polygonal opening, axially penetrating the center position of the rotating part (2), and the penetration port (22) is coaxially arranged with the pipe (100) to be tested; The axial rod (3) is a multi-prism structure, the shape of the vertical cross section of the axial rod (3) matches the through-hole (22), and the axial rod (3) is axially movable and inserted into the rotating member (2) through the through-hole (22).

10. The ultrasonic detection device for pipe defects according to any one of claims 1 to 9, characterized in that: The detection device also includes: A first locking member (7) is threadedly connected to at least one of the end fixing components (1) and at least partially stops the corresponding rotating member (2). The first locking member (7) is configured to lock and fix the rotating member (2) relative to the end fixing component (1) so that the rotating member (2) has a preset circumferential rotation angle relative to the end fixing component (1).

11. The ultrasonic detection device for pipe defects according to any one of claims 1 to 9, characterized in that: The detection device also includes: A second locking member (8) is threadedly connected to at least one of the rotating members (2) and at least partially stops the axial rod member (3). The second locking member (8) is configured to lock and fix the axial rod member (3) relative to the rotating member (2) so that the axial rod member (3) has a preset axial movement length relative to the rotating member (2).

12. The ultrasonic detection device for pipe defects according to any one of claims 1 to 9, characterized in that: The detection device also includes: A crank (9) is connected to one end of the axial rod (3) extending outside the rotating member (2) and the end fixing assembly (1), and the crank (9) is configured to drive the axial rod (3) to move axially along the central axis (101) and to drive the axial rod (3) to rotate circumferentially around the central axis (101).

13. The ultrasonic detection device for pipe defects according to any one of claims 1 to 9, characterized in that: The axial connection assembly (5) comprises: At least two axial connecting rods (51) are evenly distributed on the outside of the pipe wall of the pipe (100) to be tested, and both ends of the rods axially penetrate the corresponding end fixing components (1); The fasteners (52) are respectively connected to the corresponding axial connecting rods (51) to fix and clamp the two end fixing assemblies (1) on the measured pipe (100).

14. The ultrasonic detection device for pipe defects according to any one of claims 1 to 9, characterized in that: The ultrasonic detection assembly (4) comprises: A fixing cylinder (41) detachably connected to the axial rod (3); A movable rod (42) is movably connected to the fixed tube (41) and is telescopically movable relative to the fixed tube (41) along the radial direction of the measured pipe (100); an elastic connecting member (43), elastically connected between the fixed tube (41) and the movable rod (42), and configured to elastically drive the movable rod (42) to move toward the inner cavity wall of the tested pipe (100); The ultrasonic probe (44) is detachably connected to one end of the movable rod (42) facing the inner cavity wall of the measured pipe (100), and the detection end of the ultrasonic probe (44) adaptively abuts against the inner cavity wall of the measured pipe (100).

15. The ultrasonic detection device for pipe defects according to claim 14, characterized in that: The ultrasonic detection assembly (4) further comprises: The clamp (46) is fixedly connected to the outer end of the movable rod (42) extending out of the fixed tube (41), and the ultrasonic probe (44) is detachably connected to the movable rod (42) through the clamp (46).

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