Nuclear power plant flange thread hole inspection device

Abstract

This invention provides a device for inspecting threaded holes on the flange face of a nuclear power plant, comprising a main connecting plate, two guide posts mounted on both sides of the lower end of the main connecting plate, a motor component positioned between the two guide posts, a motor drive component mounted at the output end below the motor component, and a detection component mounted on the motor drive component. The device for inspecting threaded holes on the flange face of a nuclear power plant provided by this invention enables ultrasonic and video inspection of the threaded hole area on the flange face of a nuclear reactor pressure vessel without damaging the threads of the threaded holes on the pressure vessel flange.

Description

Technical Field

[0001] This invention relates to the field of non-destructive testing technology for pressure vessels, and in particular to a device for inspecting threaded holes on the flange face of a nuclear power plant. Background Technology

[0002] The threaded perforation zone of a nuclear reactor pressure vessel is the boundary through which the pressure is maintained. Its performance directly affects the sealing reliability between the vessel shell and the top cover, and thus the safety performance of the pressure vessel. Due to long-term tensile stress, the threaded perforation zone is prone to cracks at the thread root. To ensure timely detection of such dangerous defects, ultrasonic and video inspection methods must be used to inspect the threaded perforation zone of the reactor pressure vessel according to inspection specifications. Summary of the Invention

[0003] The purpose of this invention is to overcome the defects described in the prior art and provide a nuclear power plant flange thread hole inspection device. This device enables ultrasonic and video inspection of the thread hole area of ​​the nuclear reactor pressure vessel flange while ensuring that the threads of the thread holes on the pressure vessel flange area are not damaged.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A device for inspecting threaded holes on the flange face of a nuclear power plant includes a main connecting plate. Two guide posts are installed on both sides of the lower end of the main connecting plate. A motor component is provided between the two guide posts. A motor drive component is installed at the output end below the motor component. A detection component is provided on the motor drive component.

[0006] As one possible implementation, the detection component is a probe holder, and the motor component drives the probe holder to scan around the threaded hole on the flange face of the pressure vessel.

[0007] As one feasible approach, the detection component is a video connection board, on which a miniature camera is mounted, and the motor component drives the miniature camera to perform video inspection around the axis of the threaded hole within the threaded hole.

[0008] As one possible implementation, a suspending cup holder is provided above the motor component, and the suspending cup holder is connected to a long rod.

[0009] As one possible implementation, the motor component is provided with a lifting frame around its periphery, and the lifting cup holder is mounted on the top of the lifting frame.

[0010] As one possible implementation, the main connecting plate is equipped with a water sprayer.

[0011] As one possible implementation, a connecting plate is mounted on the main connecting plate, and a downward-facing miniature camera is provided on the connecting plate.

[0012] As one possible implementation, the wheelbase of the two guide posts is equal to twice the wheelbase of two adjacent threaded holes.

[0013] As one possible implementation, the diameter of the guide post is equal to the diameter of the threaded hole.

[0014] As one possible implementation, the guide post is a cylindrical structure with a tapered bottom.

[0015] Compared with the prior art, the nuclear power plant flange thread hole inspection device provided by the present invention has the following advantages:

[0016] (1) The long pole is connected to the hanging cup seat on the inspection device to realize the remote and rapid installation of the inspection device.

[0017] (2) By utilizing the characteristics of the threaded hole on the flange face of the nuclear reactor pressure vessel, and by inserting double guide posts into the adjacent threads on both sides of the threaded hole to be inspected, the inspection device can be quickly positioned and installed.

[0018] (3) Multiple miniature cameras and water sprayers are arranged above and around the ultrasonic probe holder and the video inspection miniature camera. The multiple miniature cameras realize real-time monitoring of the inspection status of the inspection area, and the water sprayers provide water coupling for remote ultrasonic inspection.

[0019] (4) The motor component can be quickly connected to an ultrasonic probe holder or a video inspection miniature camera to realize ultrasonic inspection of the flange surface area of ​​the threaded hole, as well as video inspection of the inside of the threaded hole. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional view of the flange face of a nuclear reactor pressure vessel.

[0022] Figure 2 This is a top view of the flange face of a nuclear reactor pressure vessel.

[0023] Figure 3 This is a schematic diagram of the nuclear power plant flange thread hole inspection device provided in an embodiment of the present invention, in which a probe holder is installed;

[0024] Figure 4 for Figure 3 The front view;

[0025] Figure 5 for Figure 3 A bottom view;

[0026] Figure 6 This is a schematic diagram of the inspection device for inspecting threaded holes on the flange of a nuclear power plant flange provided in an embodiment of the present invention, which is installed on the flange of a nuclear reactor pressure vessel, wherein a probe holder is used.

[0027] Figure 7 This is a schematic diagram of the nuclear power plant flange thread hole inspection device provided in an embodiment of the present invention, in which a video connection plate is installed;

[0028] Figure 8 This is a schematic diagram of the inspection device for inspecting threaded holes on the flange of a nuclear power plant flange provided in an embodiment of the present invention, which is installed on the flange of a nuclear reactor pressure vessel, and a video connection plate is used for installation.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Threaded hole; 2. Pressure vessel flange face; 3. Lifting cup holder; 4. Lifting frame; 5. Motor components; 6. Guide column; 7. Connecting plate; 8. Miniature camera; 9. Water sprayer; 10. Motor drive component; 11. Probe holder; 12. Main connecting plate; 13. Video connecting plate. Detailed Implementation

[0031] Although the nuclear power plant flange threaded hole inspection device of the present invention can be implemented in many different ways, exemplary embodiments will be described in detail herein with reference to the accompanying drawings. It is to be understood that the description herein should be considered as an illustrative example of the structure of the nuclear power plant flange threaded hole inspection device, and is not intended to limit the scope of protection of the invention to the exemplary embodiments. Therefore, in essence, the accompanying drawings and the description of specific embodiments should be considered as illustrative rather than limiting of the invention.

[0032] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "horizontal", "vertical", etc., used herein to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0033] The following detailed description provides further details on specific implementation methods.

[0034] like Figure 1 and Figure 2 As shown, a ring of threaded holes 1 is evenly arranged on the flange face 2 of the pressure vessel. The device designed in this invention performs ultrasonic and video inspections on the threaded hole area of ​​the pressure vessel flange face. That is, the device provided by this invention can achieve different inspection functions by changing different detection components.

[0035] like Figures 3 to 8 As shown, this invention provides a device for inspecting threaded holes on the flange face of a nuclear power plant. The main body consists of a lifting cup holder 3, a lifting frame 4, a motor component 5, a guide column 6, a connecting plate 7, a miniature camera 8, a water sprayer 9, a motor drive component 10, and a main body connecting plate 12. Ultrasonic inspection of the flange face threaded area is achieved by installing probe holders 11 at the lower end of the motor component 5, and video inspection of the inner side of the threaded hole is achieved by installing a video connecting plate 13 and the miniature camera 8.

[0036] The main connection structure is as follows: The main connecting plate 12 adopts a thin-walled plate-like structure. Two guide posts 6 are installed on both sides of the lower end of the main connecting plate 12, and the two guide posts 6 are connected to the main connecting plate 12 by screws. The guide posts 6 adopt a cylindrical structure with a tapered front end, and the guide posts are made of soft materials, such as polyoxymethylene resin or nylon, to prevent damage to the threaded holes when the guide posts 6 are inserted. The distribution diameter of the two guide posts 6 is the same as the distribution diameter of the threaded holes on the pressure vessel flange face, and the span between the two guide posts 6 is equal to the span between the three guide posts.

[0037] Two guide posts 6 are distributed on the upper end of the main connecting plate 12, and a motor component 5 is installed in the middle of the two guide posts. The motor component 5 is connected to the main connecting plate 12 by screws. A lifting frame 4 is installed on the outside of the motor component 5. The lifting frame 4 is connected to the main connecting plate 12 by screws. The lifting frame 4 can serve as a cover for the motor component 5, thus protecting the motor component 5.

[0038] A lifting cup holder 3 is installed at the upper end of the lifting frame 4. The lifting cup holder 3 is connected to the lifting frame 4 by screws. The lifting cup holder 3 is connected by a long lifting rod, which enables remote installation of the inspection device.

[0039] like Figure 4 and Figure 6 As shown, a motor drive unit 10 is installed at the output end below the motor component 5. The universal motor drive unit 10 connects the ultrasonic probe holder 11 to the motor component 5. The motor component 5 drives the motor drive unit 10 to rotate, thereby causing the ultrasonic probe holder 11 to scan around the threaded hole 1 on the pressure vessel flange face 2.

[0040] like Figure 7 and Figure 8As shown, when the motor drive unit 10 is connected to the video connection board 13, multiple miniature cameras 8 can be installed on the video connection board 13. The motor drive unit 10 drives the motor drive unit 10 to rotate, thereby driving the multiple miniature cameras 8 installed on the video connection board 13 to perform video inspection around the axis of the threaded hole 1.

[0041] Multiple water sprayers 9 are installed on the main connecting plates 12 on both sides of the motor component 5. During ultrasonic inspection of the threaded flange face, the water sprayers 9 spray water in the inspection area of ​​the pressure vessel flange face through the water supply pipe, ensuring the coupling between the probe and the inspection surface. Miniature cameras 8 are connected to the main connecting plate 12 through the connecting plate 7. Multiple miniature cameras 8 are arranged around the motor component 5, with their viewing angle facing the lower inspection area, realizing the real-time monitoring function of the inspection device.

[0042] The nuclear power plant flange thread hole inspection device provided by this invention is used as follows:

[0043] like Figures 3 to 6 As shown, during ultrasonic inspection of the threaded area of ​​a nuclear reactor pressure vessel flange, a long rod is used to connect to the lifting cup 3 on the inspection device, which is then hoisted above the threaded hole 1 on the pressure vessel flange 2. Guide posts 6 on both sides of the inspection device are inserted into the two adjacent threaded holes of the threaded hole 1 being inspected, achieving rapid installation and positioning of the inspection device. A water sprayer 9 on the inspection device sprays water for probe coupling into the inspection area around the threaded hole through a water pipe. The constant force spring structure on the ultrasonic probe holder 11 ensures the ultrasonic probe is in contact with the inspected surface. The motor component 5 drives the ultrasonic probe holder 11 to rotate around the thread axis, achieving ultrasonic inspection of the threaded hole area on the flange surface. Multiple miniature cameras 8 above the probe holder 11 monitor the probe inspection status in real time. After the ultrasonic inspection of the inspected threaded hole is completed, the long rod can be used to sequentially install the threaded hole inspection device onto adjacent threads to continue ultrasonic inspection work.

[0044] like Figure 7 and Figure 8 As shown, when performing video inspection of the inner thread of a nuclear reactor pressure vessel flange, the ultrasonic probe holder 11 needs to be quickly replaced with a video connection plate 13 equipped with multiple miniature cameras 8. A long rod is used to connect it to the lifting cup seat 3 on the inspection device, which is then hoisted above the threaded hole 1 on the pressure vessel flange 2. Guide posts 6 on both sides of the inspection device are inserted into adjacent threaded holes of the inspected threaded hole 1, achieving rapid installation and positioning of the inspection device. The motor component 5 drives multiple miniature cameras 9 to rotate around the threaded hole axis within the threaded hole, enabling video inspection of the inner threaded hole 1. Multiple miniature cameras 8 above the video connection plate 13 monitor the video inspection status at the lower end. After the video inspection of the inspected threaded hole is completed, the long rod can be used to sequentially install the threaded hole inspection device onto adjacent threads to continue the video inspection of the inner threaded hole.

[0045] The nuclear power plant flange thread hole inspection device provided by this invention has the following advantages:

[0046] (1) A double guide post positioning structure based on the threaded hole characteristics of the flange face of a nuclear reactor pressure vessel. By utilizing the characteristics of the adjacent threaded holes on both sides of the threaded hole to be inspected, the guide posts distributed at both ends of the inspection device are inserted into the adjacent threaded holes on both sides of the threaded hole to be inspected, thereby achieving rapid positioning of the threaded hole inspection device on the flange face of the pressure vessel.

[0047] (2) Remote hoisting and installation operation mode. By using a multi-section long pole connected to the hoisting cup seat, the inspection device can be remotely installed and disassembled. The long pole can quickly switch between different inspection holes for inspection.

[0048] (3) Layout of multiple miniature cameras and water sprayers. Multiple miniature cameras and water sprayers are arranged above and around the ultrasonic probe holder and the video inspection miniature camera. The multiple miniature cameras realize real-time monitoring of the inspection status of the inspection area, and the water sprayers provide water coupling for remote ultrasonic inspection.

[0049] (4) Modular design with universal interface for motor components. The motor components can be quickly connected to an ultrasonic probe holder or a miniature video inspection camera to achieve ultrasonic inspection of the flange surface area of ​​the threaded hole, as well as video inspection of the inside of the threaded hole.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A nuclear power plant flange face thread hole inspection device, characterized by, The utility model provides a kind of pressure vessel inspection device, including main body connecting plate (12), water sprayer (9) is equipped on the main body connecting plate (12), connecting plate (7) is installed on the main body connecting plate (12), downwards micro video camera (8) is equipped on the connecting plate (7), two guide posts (6) are installed on the lower end both sides of the main body connecting plate (12), motor component (5) is equipped between two the guide posts (6), hoisting cup seat (3) is equipped above the motor component (5), the hoisting cup seat (3) is connected long rod, hoisting frame (4) is equipped in the periphery of the motor component (5), the hoisting frame (4) top is installed the hoisting cup seat (3), motor drive piece (10) is installed in the output end below the motor component (5), detection component is equipped on the motor drive piece (10);The detection component is probe holder (11), the motor component (5) drives the probe holder (11) and is scanned in pressure vessel flange face (2) around threaded hole (1);The detection component is video connecting plate (13), micro video camera (8) is equipped on the video connecting plate (13), the motor component (5) drives the micro video camera (8) and does video inspection in threaded hole (1) around threaded hole axis.

2. The nuclear power plant flange face thread hole inspection apparatus of claim 1, wherein, The axis distance of two the guide posts (6) is equal to 2 times the axis distance of adjacent two threaded holes (1).

3. The nuclear power plant flange face thread hole inspection apparatus of claim 2, wherein, The diameter of the guide post (6) is equal to the diameter of the threaded hole (1).

4. The nuclear power plant flange face thread hole inspection apparatus of claim 1, wherein, The guide post (6) is cylindrical structure with taper at bottom.

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