Ultrasonic detection module and ultrasonic detection device for pipeline welding seam of nuclear power plant

Abstract

The utility model discloses an ultrasonic detection module and an ultrasonic detection device for a pipeline welding seam of a nuclear power plant, and the ultrasonic detection module for the pipeline welding seam of the nuclear power plant comprises an installation assembly which is fixedly installed with an external part, a guide rail assembly, a constant force assembly, a probe frame and an ultrasonic probe, the constant force assembly is connected with the guide rail assembly and the installation assembly and provides constant pressure for the guide rail assembly, the end, away from the constant force assembly, of the guide rail assembly is connected with the probe frame, and the ultrasonic probe is installed on the probe frame. The guide rail assembly comprises at least two parallel guide rails. Constant and sufficient pressure is provided through the constant force assembly, the pressure between the ultrasonic probe and the outer wall face of the pipeline is greatly increased through the at least two guide rails, the ultrasonic probe can be well coupled with the outer wall face of the to-be-detected pipeline, and the situation that ultrasonic detection is affected due to insufficient coupling pressure is avoided; and the ultrasonic acquisition data of the to-be-detected pipeline weld joint is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant pipeline weld detection, in particular to an ultrasonic detection module and an ultrasonic detection device for nuclear power plant pipeline welds. Background Art

[0002] The primary circuit main piping of my country's pressurized water reactor nuclear power plants is a critical component within the nuclear island, connecting the reactor pressure vessel, main pumps, and steam generators. It serves as a veritable "energy highway" within the nuclear island. To meet the operational requirements of nuclear power plants, regular automated ultrasonic inspection of the austenitic stainless steel welds of these main piping is required. The primary circuit main piping is cast from large-diameter, thick-walled austenitic stainless steel, and the accuracy of ultrasonic inspection results for these welds is significantly affected by the coupling between the probe and the pipe wall.

[0003] Existing automated ultrasonic inspection processes often use a probe ring mounted on the outer wall of the main pipe, then independently movable circumferential and axial devices to carry the ultrasonic probe for inspection. The probe is pressed against the outer wall of the main pipe using spring guides on the probe holder. However, with this method, the pressure exerted by the ultrasonic probe on the main pipe varies with its circumferential position, and the coupling conditions also vary accordingly. Furthermore, the coarse grains of austenitic stainless steel severely scatter ultrasonic waves, making it prone to inconsistent coupling pressure that can affect ultrasonic data acquisition. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an ultrasonic detection module and an ultrasonic detection device for nuclear power plant pipeline welds.

[0005] The technical solution adopted by the present invention to solve its technical problem is: an ultrasonic detection module for nuclear power plant pipeline welds, comprising a mounting assembly fixedly mounted on an external component, a guide rail assembly, a constant force assembly, a probe holder, and an ultrasonic probe, wherein the guide rail assembly is slidably connected to the mounting assembly, the constant force assembly is respectively connected to the guide rail assembly and the mounting assembly and provides constant pressure to the guide rail assembly, the end of the guide rail assembly away from the constant force assembly is connected to the probe holder, and the ultrasonic probe is mounted on the probe holder;

[0006] The guide rail assembly includes at least two guide rails parallel to each other.

[0007] In some embodiments, the constant force component includes a constant force elastic body, a first connecting member and a second connecting member, the constant force elastic body is connected to the first connecting member and the second connecting member respectively, one of the first connecting member and the second connecting member is fixedly connected to the mounting component, and the other of the first connecting member and the second connecting member is fixedly connected to the guide rail.

[0008] In some embodiments, the constant force elastic body includes a reel and a metal sheet, the metal sheet is wound on the reel and the metal sheet is provided with an end portion;

[0009] The reel is rotatably connected to one of the first connecting member and the second connecting member, and the end of the metal sheet is fixedly connected to the other of the first connecting member and the second connecting member.

[0010] In some embodiments, the mounting assembly includes a mounting plate and at least two sliders, at least two of the sliders are fixedly connected to the mounting plate respectively, and each of the sliders is provided with a slideway for sliding engagement with the guide rail.

[0011] In some embodiments, a limiting protrusion is provided on one of the slider and the guide rail, and a limiting groove is provided on the other of the slider and the guide rail. Both the limiting protrusion and the limiting groove extend along the axial direction of the guide rail, and the limiting protrusion is inserted into the limiting groove to achieve limitation.

[0012] In some embodiments, the probe holder includes a base, a clamping assembly, and a probe frame sleeved on the outside of the ultrasound probe, the base is fixedly connected to the two guide rails respectively, the first end of the clamping assembly is connected to the base, and the first end of the clamping assembly is connected to the opposite sides of the probe holder.

[0013] In some embodiments, the base is provided with a mounting hole and at least two limiting grooves, and at least two of the limiting grooves are provided on both sides of the mounting hole;

[0014] The clamping assembly includes an intermediate connecting piece, a head connecting piece, two swing rods and two clamping arms, the first end of the head connecting piece is connected to the middle part of the intermediate connecting piece, the second end of the head connecting piece is inserted into the mounting hole and can be rotatably connected, the two swing rods are arranged on both sides of the head connecting piece and each of the swing rods abuts against the limiting groove to limit the rotation range of the head connecting piece, and the two clamping arms are arranged on the relatively outer sides of the two swing rods and are respectively detachably connected to the intermediate connecting piece.

[0015] In some embodiments, the mounting assembly further includes a plurality of first position-limiting members, wherein the plurality of first position-limiting members are connected to the mounting plate;

[0016] The probe holder further includes at least one second limiting member, wherein the second limiting member is connected to the base;

[0017] The first limiting member and the second limiting member are detachably connected to achieve positioning.

[0018] In some embodiments, one of the first limiting member and the second limiting member is provided with a plurality of limiting holes, and the plurality of limiting holes are arranged in sequence along the axial direction of the guide rail. The other of the first limiting member and the second limiting member is a pin, and the pin is inserted into the limiting hole to achieve positioning.

[0019] The utility model also constructs an ultrasonic detection device for nuclear power plant pipeline welds, comprising a ring frame connected to the pipeline to be detected, a circumferentially movable module, an axially movable module, and several ultrasonic detection modules for nuclear power plant pipeline welds described in any one of the above items, the circumferentially movable module being connected to the ring frame, the axially movable module being connected to the circumferentially movable module; several of the ultrasonic detection modules are arranged at intervals, and each of the ultrasonic detection modules is connected to the axially movable module.

[0020] By implementing the utility model, the following beneficial effects are achieved:

[0021] The ultrasonic detection module for pipeline welds in nuclear power plants of the present invention includes a mounting assembly fixed to an external component, a guide rail assembly, a constant force assembly, a probe holder, and an ultrasonic probe. The guide rail assembly is slidably connected to the mounting assembly, the constant force assembly is respectively connected to the guide rail assembly and the mounting assembly and provides constant pressure to the guide rail assembly, the end of the guide rail assembly away from the constant force assembly is connected to the probe holder, and the ultrasonic probe is mounted on the probe holder; the guide rail assembly includes at least two mutually parallel guide rails. Constant and sufficient pressure is provided by the constant force assembly, and the pressure between the ultrasonic probe and the outer wall of the pipeline to be detected is greatly increased by at least two guide rails. The ultrasonic probe can achieve good coupling with the outer wall of the pipeline to be detected, avoiding the situation where the ultrasonic inspection is affected by insufficient coupling pressure, and ensuring that the ultrasonic acquisition data of the pipeline weld to be detected is not affected.

[0022] The present invention provides an ultrasonic detection device for nuclear power plant pipeline welds, comprising a ring frame connected to the pipeline to be inspected, a circumferentially movable module, an axially movable module, and a plurality of ultrasonic detection modules for nuclear power plant pipeline welds. The circumferentially movable module is connected to the ring frame, and the axially movable module is connected to the circumferentially movable module. The plurality of ultrasonic detection modules are spaced apart, and each ultrasonic detection module is connected to the axially movable module. The circumferentially movable module drives the axially movable module to move circumferentially, and the axially movable module drives the ultrasonic detection module to move axially, ultimately driving the ultrasonic detection module to move circumferentially and axially, thereby reaching weld positions at different heights of the pipeline to be inspected, as well as any position of the circumferential weld of the pipeline to be inspected. The ultrasonic detection module performs ultrasonic detection on any position of the circumferential weld of the pipeline to be inspected. The ultrasonic detection module can achieve good coupling with the outer wall of the pipeline to be inspected, avoiding the situation where insufficient coupling pressure affects the ultrasonic inspection, and ensuring that the ultrasonic acquisition data of the pipeline weld to be inspected is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0024] Figure 1 This is a schematic structural diagram of an ultrasonic detection module for nuclear power plant pipeline welds according to an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A structural diagram of the ultrasonic detection module from another perspective;

[0026] Figure 3 yes Figure 1 Schematic diagram of the structure of the constant force component;

[0027] Figure 4 yes Figure 1 Structural diagram of the guide rail and slider in FIG;

[0028] Figure 5 yes Figure 1 Schematic diagram of the probe holder in FIG. DETAILED DESCRIPTION

[0029] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings.

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0031] In the description of the utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, "multiple" means two or more.

[0032] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or chemical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0033] One embodiment of the present invention discloses an ultrasonic inspection device for nuclear power plant pipeline welds, comprising a ring frame connected to the pipeline to be inspected, a circumferentially movable module, an axially movable module, and several ultrasonic inspection modules for nuclear power plant pipeline welds. The circumferentially movable module is connected to the ring frame, and the axially movable module is connected to the circumferentially movable module. Several ultrasonic inspection modules are arranged at intervals, and each ultrasonic inspection module is connected to the axially movable module. The number of ultrasonic inspection modules can be one, two, three, five, eight, etc., depending on actual needs. The circumferentially movable module can move on the ring frame, driving the axially movable module to move circumferentially, and ultimately driving the ultrasonic inspection module to move circumferentially, thereby reaching any position on the circumferential weld. The axially movable module can drive the ultrasonic inspection module to move axially, allowing the ultrasonic inspection module to reach weld locations at different heights. It is understood that the ring frame, the circumferentially movable module, and the axially movable module are all prior art and are not the focus of the present invention, and are not described in detail here.

[0034] See also Figure 1 and Figure 2The ultrasonic detection module for pipeline welds in nuclear power plants includes a mounting assembly 1 fixed to an external component, a guide rail assembly 2, a constant force assembly 3, a probe holder 4, and an ultrasonic probe 5. The guide rail assembly 2 is slidably connected to the mounting assembly 1. The constant force assembly 3 is respectively connected to the guide rail assembly 2 and the mounting assembly 1 and provides constant pressure to the guide rail assembly 2. One end of the guide rail assembly 2 away from the constant force assembly 3 is connected to the probe holder 4, and the ultrasonic probe 5 is mounted on the probe holder 4. The guide rail assembly 2 includes at least two mutually parallel guide rails 21, such as two, three, four, etc., which are specifically set according to actual needs.

[0035] Take the guide rail assembly 2 as an example, which includes two parallel guide rails 21. The constant force assembly 3 provides constant and sufficient pressure to the two guide rails 21, and the two guide rails 21 transmit constant and sufficient pressure to the ultrasonic probe 5, so that the ultrasonic probe 5 can fit tightly on the outer wall of the pipe to be detected. When a coupling agent is applied, the ultrasonic probe 5 can achieve good coupling with the outer wall of the pipe to be detected. The mounting assembly 1 is installed and fixed on the axial moving module, that is, the external component refers to the axial moving module. In other embodiments, the external component may also refer to other connecting structures, and the mounting assembly 1 is connected to the axial moving module through the connecting structure. Among them, the ultrasonic probe 5 is a prior art and will not be described here.

[0036] In some embodiments, see also Figure 3 The constant force assembly 3 includes a constant force elastic body 31, a first connecting member 32, and a second connecting member 33. The constant force elastic body 31 is connected to the first connecting member 32 and the second connecting member 33 respectively. One of the first connecting member 32 and the second connecting member 33 is fixedly connected to the mounting assembly 1, and the other of the first connecting member 32 and the second connecting member 33 is fixedly connected to the guide rail 21. For example, if the first connecting member 32 is fixedly connected to the mounting assembly 1, then the second connecting member 33 is fixedly connected to the guide rail 21.

[0037] The second connecting member 33 is fixedly connected to the mounting assembly 1, and the first connecting member 32 is fixedly connected to the guide rail 21. When there are two guide rails 21, the other of the first connecting member 32 and the second connecting member 33 can be fixedly connected to both guide rails at the same time; when there are three guide rails 21, the other of the first connecting member 32 and the second connecting member 33 can be fixedly connected to all three guide rails at the same time, and so on. It is understandable that the constant-force elastic body 31 can be a constant-force spring, a gas spring, a hydraulic spring, or a combination of elastic elements. For example, a gas spring can output a constant force by maintaining stable air pressure, and a hydraulic spring can output a constant force by maintaining stable hydraulic pressure.

[0038] In some embodiments, the constant-force elastic body 31 includes a drum 311 and a metal sheet 312. The metal sheet 312 is wound around the drum 311 and has an end. The drum 311 is rotatably connected to one of the first connecting member 32 and the second connecting member 33, and the end of the metal sheet 312 is fixedly connected to the other of the first connecting member 32 and the second connecting member 33. That is, in this embodiment, the constant-force elastic body 31 is a coil spring. Preferably, there are two metal sheets 312, and the central axis of each metal sheet 312 coincides with the central axis of one guide rail 21, so that the force on the two guide rails 21 is uniform.

[0039] In some embodiments, the mounting assembly 1 includes a mounting plate 11 and at least two sliders 12, at least two sliders 12 are respectively fixedly connected to the mounting plate 11, and each slider 12 is provided with a slideway that slides with the guide rail 21. The mounting plate 11 is mounted and fixed on an external component, such as an axially movable module or other connecting structure, and the mounting plate 11 is connected to the axially movable module through the connecting structure. The number of sliders 12 remains the same as the number of guide rails, and can be two, three, four, etc., according to actual needs. It can be understood that in some other embodiments, a slider 12 can be provided with multiple slideways, and the number of slideways can remain the same as the number of guide rails 21.

[0040] In some embodiments, see also Figure 4 In order to prevent derailment, a limiting protrusion 13 is provided on one of the slider 12 and the guide rail 21, and a limiting groove 22 is provided on the other of the slider 12 and the guide rail 21. Both the limiting protrusion 13 and the limiting groove 22 extend along the axial direction of the guide rail 21, and the limiting protrusion 13 is inserted into the limiting groove 22 to achieve positioning. For example, the slider 12 is provided with a limiting protrusion 13, and optionally there are two limiting protrusions 13, which are respectively located on the two side walls of the slide. Similarly, there are two limiting grooves 22, which are respectively formed by the two side walls of the guide rail 21 being recessed inward. Or the guide rail 21 is provided with a limiting protrusion 13, and optionally there are two limiting protrusions 13, which are respectively located on the two side walls of the guide rail 21. Similarly, there are two limiting grooves 22, which are respectively formed by the two side walls of the slide being recessed outward, and the slide is connected to the limiting groove 22. It can be understood that the structures of the two sliders 12 can be consistent or inconsistent. Similarly, the structures of the two guide rails 21 may be consistent or inconsistent, as long as the slider 12 cooperates with the corresponding guide rail 21 to achieve stable sliding.

[0041] In some embodiments, see also Figure 5The probe holder 4 includes a base 41, a clamping assembly 42, and a probe frame 43 that is sleeved onto the outside of the ultrasonic probe 5. The base 41 is fixedly connected to the two guide rails 21. The first end of the clamping assembly 42 is connected to the base 41, and the second end of the clamping assembly 42 is connected to opposite sides of the probe holder 4. Preferably, the probe frame 43 is removably sleeved onto the outside of the ultrasonic probe 5 to facilitate replacement of the ultrasonic probe 5.

[0042] It is understandable that the base 41 includes a connecting plate 411 connected to the two guide rails 21 and a steering portion 412 connected to the clamping assembly 42. The steering portion 412 and the connecting plate 411 are perpendicular to each other to prevent all components from being concentrated on the same axis and taking up too much space, and to facilitate the installation of the clamping assembly 42. The connecting plate 411 can be detachably connected to the two guide rails 21 by a pair of bolts. The connecting plate 411 and the guide rails 21 are respectively provided with a plurality of bolt holes for installation and fixation. Optionally, the ends of the two guide rails 21 can abut against the steering portion 412 to improve the installation stability of the base 41 and the two guide rails 21 and prevent the base 41 and the two guide rails 21 from rotating relative to each other.

[0043] In some embodiments, the base 41 is provided with a mounting hole 413 and at least two limiting slots 414, with the at least two limiting slots 414 being located on either side of the mounting hole 413. The number of limiting slots 414 can be, for example, two, three, or four. At least one limiting slot 414 is located on either side of the mounting hole 413, and the number of limiting slots 414 on either side of the mounting hole 413 can be the same or different. The mounting hole 413 is a circular hole, and the limiting slots are arc-shaped. It is understood that both the mounting hole 413 and the limiting slots 414 are located on the turning portion 412.

[0044] The clamping assembly 42 includes an intermediate connector 421, a head connector 422, two swing rods 423 and two clamping arms 424. The first end of the head connector 422 is connected to the middle of the intermediate connector 421, and the second end of the head connector 422 is inserted into the mounting hole 413 and is rotatably connected. The two swing rods 423 are arranged on both sides of the head connector 422 and each swing rod 423 abuts against the limiting groove to limit the rotation range of the head connector 422. The two clamping arms 424 are arranged on the relative outer sides of the two swing rods 423 and are respectively detachably connected to the intermediate connector 421. The end of each clamping arm 424 away from the intermediate connector 421 is rotatably connected to the probe frame 43. Among them, the pressure of the two guide rails 21 is transmitted to the head connector 422 through the turning part 412. The head connector 422 is located in the middle of the intermediate connector 421, so that the two ends of the intermediate connector 421 are evenly stressed, and uniform pressure can be transmitted to the two clamping arms 424, and then transmitted to the ultrasonic probe 5 through the probe frame 43, and finally the ultrasonic probe 5 can be compacted on the outer wall of the pipe to be tested.

[0045] In some embodiments, since the constant force assembly 3 always provides constant force for the guide rail assembly 2, it is difficult to maintain the guide rail assembly 2 in a certain position by manpower. In order to facilitate the replacement of parts, the installation assembly 1 also includes a plurality of first limit members 14, and the plurality of first limit members 14 are connected to the mounting plate 11. The probe holder 4 also includes at least one second limit member 44, and the second limit member 44 is connected to the base 41. The first limit member 14 and the second limit member 44 are detachably connected and positioned. When it is necessary to replace parts, for example, when replacing the ultrasonic probe 5, the ultrasonic probe 5 is taken away from the outer wall of the pipe to be detected by the two guide rails 21, and is connected to the second limit member 44 by the first limit member 14 to achieve positioning, and the ultrasonic probe 5 can be replaced. The replacement of other parts is similar and will not be described here.

[0046] In some embodiments, one of the first limiting member 14 and the second limiting member 44 is provided with a plurality of limiting holes, and the plurality of limiting holes are arranged in sequence along the axial direction of the guide rail 21, and the other of the first limiting member 14 and the second limiting member 44 is a latch, and the latch is inserted into the limiting hole to achieve positioning. Inserting the latch into the limiting holes at different positions can position the guide rail 21 at different positions. For example, the first limiting member 14 is a limiting hole opened on the mounting plate 11, and the number of limiting holes can be one, two, or three, etc., and the second limiting member 44 is a latch connected to the base 41, especially a latch connected to the connecting plate 411. For another example, the first limiting member 14 is a latch connected to the mounting plate 11, and the second limiting member 44 is a plurality of limiting holes opened on the base 41, especially a plurality of limiting holes opened on the connecting plate 411, and the number of limiting holes can be one, two, or three, etc.

[0047] By implementing the utility model, the following beneficial effects are achieved:

[0048] The ultrasonic detection module for pipeline welds in nuclear power plants of the present invention provides constant and sufficient pressure through the constant force component 3, and greatly increases the pressure between the ultrasonic probe 5 and the outer wall of the pipeline through at least two guide rails 21. The ultrasonic probe 5 can achieve good coupling with the outer wall of the pipeline to be inspected, avoiding the situation where ultrasonic inspection is affected by insufficient coupling pressure, and ensuring that the ultrasonic collection data of the pipeline weld to be inspected is not affected.

[0049] The present invention is an ultrasonic inspection device for nuclear power plant pipeline welds. A circumferentially movable module drives an axially movable module to move circumferentially. The axially movable module drives the ultrasonic inspection module to move axially, ultimately driving the ultrasonic inspection module to move circumferentially and axially, thereby reaching weld locations at different heights of the pipeline to be inspected, as well as any location within the girth weld of the pipeline to be inspected. The ultrasonic inspection module performs ultrasonic inspection at any location within the girth weld of the pipeline to be inspected. The ultrasonic inspection module achieves good coupling with the outer wall of the pipeline to be inspected, preventing the ultrasonic inspection from being affected by insufficient coupling pressure, and ensuring that the ultrasonic data collected from the pipeline weld is not affected.

[0050] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above embodiments or technical features can be freely combined, and several deformations and improvements can be made, which all fall within the scope of protection of the present invention, that is, the embodiments described in "some embodiments" can be freely combined with any of the above and below embodiments. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. An ultrasonic detection module for nuclear power plant pipeline welds, characterized in that: The invention comprises a mounting assembly (1) fixedly mounted on an external component, a guide rail assembly (2), a constant force assembly (3), a probe frame (4) and an ultrasonic probe (5), wherein the guide rail assembly (2) is slidably connected to the mounting assembly (1), the constant force assembly (3) is respectively connected to the guide rail assembly (2) and the mounting assembly (1) and provides a constant pressure to the guide rail assembly (2), an end of the guide rail assembly (2) away from the constant force assembly (3) is connected to the probe frame (4), and the ultrasonic probe (5) is mounted on the probe frame (4); The guide rail assembly (2) comprises at least two guide rails (21) parallel to each other.

2. The ultrasonic detection module for nuclear power plant pipeline welds according to claim 1, characterized in that: The constant force assembly (3) comprises a constant force elastic body (31), a first connecting member (32) and a second connecting member (33); the constant force elastic body (31) is connected to the first connecting member (32) and the second connecting member (33) respectively; one of the first connecting member (32) and the second connecting member (33) is fixedly connected to the mounting assembly (1); and the other of the first connecting member (32) and the second connecting member (33) is fixedly connected to the guide rail (21).

3. The ultrasonic detection module for nuclear power plant pipeline welds according to claim 2, characterized in that: The constant force elastic body (31) comprises a reel (311) and a metal sheet (312), wherein the metal sheet (312) is wound on the reel (311) and is provided with an end portion; The reel (311) is rotatably connected to one of the first connecting member (32) and the second connecting member (33), and the end of the metal sheet (312) is fixedly connected to the other of the first connecting member (32) and the second connecting member (33).

4. The ultrasonic detection module for nuclear power plant pipeline welds according to claim 1, characterized in that: The mounting assembly (1) comprises a mounting plate (11) and at least two sliders (12), wherein the at least two sliders (12) are respectively fixedly connected to the mounting plate (11), and each slider (12) is provided with a slideway for slidingly engaging with the guide rail (21).

5. The ultrasonic detection module for nuclear power plant pipeline welds according to claim 4, characterized in that: A limiting protrusion (13) is provided on one of the slider (12) and the guide rail (21), and a limiting groove (22) is provided on the other of the slider (12) and the guide rail (21). Both the limiting protrusion (13) and the limiting groove (22) extend along the axial direction of the guide rail (21), and the limiting protrusion (13) is inserted into the limiting groove (22) to achieve limiting.

6. The ultrasonic detection module for nuclear power plant pipeline welds according to claim 4, characterized in that: The probe frame (4) comprises a base (41), a clamping assembly (42) and a probe frame (43) sleeved on the outside of the ultrasonic probe (5); the base (41) is fixedly connected to at least two of the guide rails (21) respectively; the first end of the clamping assembly (42) is connected to the base (41); and the first end of the clamping assembly (42) is connected to two opposite sides of the probe frame (4).

7. The ultrasonic detection module for nuclear power plant pipeline welds according to claim 6, characterized in that: The base (41) is provided with a mounting hole (413) and at least two limiting grooves (414), and the at least two limiting grooves (414) are provided on both sides of the mounting hole (413); The clamping assembly (42) comprises an intermediate connecting piece (421), a head connecting piece (422), two swinging rods (423) and two clamping arms (424), wherein the first end of the head connecting piece (422) is connected to the middle part of the intermediate connecting piece (421), the second end of the head connecting piece (422) is inserted into the mounting hole (413) and is rotatably connected, the two swinging rods (423) are arranged on both sides of the head connecting piece (422), and each of the swinging rods (423) abuts against the limiting groove to limit the rotation range of the head connecting piece (422), and the two clamping arms (424) are arranged on the opposite outer sides of the two swinging rods (423) and are respectively detachably connected to the intermediate connecting piece (421).

8. The ultrasonic detection module for nuclear power plant pipeline welds according to claim 6, characterized in that: The mounting assembly (1) further comprises a plurality of first position-limiting members (14), wherein the plurality of first position-limiting members (14) are connected to the mounting plate (11); The probe frame (4) further includes at least one second limiting member (44), and the second limiting member (44) is connected to the base (41); The first limiting member (14) and the second limiting member (44) are detachably connected and can achieve positioning.

9. The ultrasonic detection module for nuclear power plant pipeline welds according to claim 8, characterized in that: One of the first limiting member (14) and the second limiting member (44) is provided with a plurality of limiting holes, and the plurality of limiting holes are sequentially arranged along the axial direction of the guide rail (21); the other of the first limiting member (14) and the second limiting member (44) is a latch, and the latch is inserted into the limiting hole to achieve positioning.

10. An ultrasonic detection device for pipeline welds in nuclear power plants, characterized in that: The invention comprises a ring frame connected to a pipeline to be inspected, a circumferentially movable module, an axially movable module, and several ultrasonic detection modules for nuclear power plant pipeline welds according to any one of claims 1 to 9, wherein the circumferentially movable module is connected to the ring frame, and the axially movable module is connected to the circumferentially movable module; and several ultrasonic detection modules are arranged at intervals, and each ultrasonic detection module is connected to the axially movable module.

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