Nuclear power device flange face threaded hole inspection device

Abstract

The invention provides a nuclear power device flange face threaded hole inspection device which comprises a main body connecting plate, two guide columns are installed on the two sides of the lower end of the main body connecting plate, a motor part is arranged between the two guide columns, a motor driving part is installed at the output end of the lower portion of the motor part, and a detection part is arranged on the motor driving part. According to the nuclear power device flange face threaded hole inspection device, ultrasonic and video inspection of a nuclear reactor pressure vessel flange face threaded hole area is achieved under the condition that it is guaranteed that threads of a pressure vessel flange face threaded hole are not damaged.

Description

Technical Field

[0001] The invention relates to the technical field of nondestructive testing of pressure vessels, and in particular to a device for inspecting threaded holes on flange surfaces of nuclear power plants. Background Art

[0002] The threaded hole band of a nuclear reactor pressure vessel is the boundary for maintaining pressure in the reactor pressure vessel. Its performance directly affects the sealing reliability of the pressure vessel cylinder and the top cover, and thus affects the safety performance of the pressure vessel. Due to long-term tensile stress, the threaded hole band is prone to cracks at the root of the thread. In order to ensure that such dangerous defects can be discovered in time, it is necessary to inspect the threaded hole band of the reactor pressure vessel using ultrasonic and video detection methods in accordance with the requirements of the inspection specifications. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects described in the prior art, thereby providing a nuclear power plant flange surface threaded hole inspection device, which can realize ultrasonic and video inspection of the nuclear reactor pressure vessel flange surface threaded hole area without damaging the threaded holes of the pressure vessel flange area.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A nuclear power plant flange surface threaded hole inspection device comprises a main connecting plate, two guide columns are installed on both sides of the lower end of the main connecting plate, a motor component is arranged between the two guide columns, a motor drive is installed at the output end below the motor component, and a detection component is arranged on the motor drive.

[0006] As an implementable manner, the detection component is a probe holder, and the motor component drives the probe holder to scan around the threaded hole on the flange surface of the pressure vessel.

[0007] As an implementable manner, the detection component is a video connection board, on which a miniature camera is provided, and the motor component drives the miniature camera to perform video inspection in the threaded hole around the axis of the threaded hole.

[0008] As an implementable manner, a hanging cup holder is provided above the motor component, and the hanging cup holder is connected to a long rod.

[0009] As an implementable manner, a hanging frame is provided on the peripheral side of the motor component, and the hanging cup holder is installed on the top of the hanging frame.

[0010] As an implementable manner, a water sprinkler is provided on the main body connecting plate.

[0011] As an implementable manner, a connecting plate is installed on the main connecting plate, and a miniature camera facing downward is provided on the connecting plate.

[0012] As an implementable manner, the axial distance between the two guide columns is equal to twice the axial distance between two adjacent threaded holes.

[0013] As an practicable manner, the diameter of the guide column is equal to the diameter of the threaded hole.

[0014] As an implementable manner, the guide column is a cylindrical structure with a tapered bottom.

[0015] Compared with the prior art, the nuclear power plant flange surface threaded hole inspection device provided by the present invention has the following beneficial effects:

[0016] (1) Use a long rod to connect with the lifting cup holder on the inspection device to achieve remote and rapid installation of the inspection device.

[0017] (2) By utilizing the threaded hole features on the flange surface of the nuclear reactor pressure vessel, double guide pins are inserted into the adjacent threads on both sides of the threaded hole to be inspected, thereby realizing rapid positioning and installation of the inspection device.

[0018] (3) Multiple micro cameras and water sprinklers are arranged around the ultrasonic probe holder and the video inspection micro camera. The multiple micro cameras can monitor the inspection status of the inspection area in real time, and the water sprinkler can 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 micro camera to realize ultrasonic inspection of the flange surface area of ​​the threaded hole and video inspection of the inside of the threaded hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a cross-sectional view of the flange surface of a nuclear reactor pressure vessel;

[0022] Figure 2 It is a top view of the flange surface of a nuclear reactor pressure vessel;

[0023] Figure 3 A schematic diagram of the structure of a nuclear power plant flange surface threaded hole inspection device provided by an embodiment of the present invention, wherein a probe holder is installed;

[0024] Figure 4 for Figure 3 A front view of

[0025] Figure 5 for Figure 3 Bottom view of

[0026] Figure 6 A schematic diagram of an inspection of a threaded hole inspection device for a flange surface of a nuclear power plant provided by an embodiment of the present invention installed on a flange of a nuclear reactor pressure vessel, wherein a probe holder is used for installation;

[0027] Figure 7 A schematic diagram of the structure of a nuclear power plant flange surface threaded hole inspection device provided by an embodiment of the present invention, wherein a video connection plate is installed;

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

[0029] Description of reference numerals:

[0030] 1. Threaded hole; 2. Flange surface of pressure vessel; 3. Lifting cup holder; 4. Lifting frame; 5. Motor components; 6. Guide column; 7. Connecting plate; 8. Mini camera; 9. Sprinkler; 10. Motor drive; 11. Probe holder; 12. Main connecting plate; 13. Video connecting plate. DETAILED DESCRIPTION

[0031] Although the nuclear power plant flange surface threaded hole inspection device of the present invention can be implemented in a variety of different ways, this article will describe the exemplary embodiment in detail in conjunction with the drawings. It is understood that the description herein should be considered as an example of the structure of the nuclear power plant flange surface threaded hole inspection device, and is not intended to limit the protection scope of the present invention to the exemplary embodiment. Therefore, in essence, the drawings and the description of the specific embodiments should be considered to be used to illustrate rather than limit the present invention.

[0032] In the description of the present invention, it should be noted that the terms "up", "down", "left", "right", "front", "back", "inside", "outside", "horizontal", "vertical", etc. used in this document to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0033] The following is further explained in detail through specific implementation methods.

[0034] like Figure 1 and Figure 2 As shown, a circle of threaded holes 1 are evenly arranged on the flange surface 2 of the pressure vessel, and the device designed by the present invention performs ultrasonic and video inspection on the threaded hole area of ​​the flange surface of the pressure vessel for this structure. That is, the device provided by the present invention realizes different inspection functions by replacing different detection components.

[0035] like Figures 3 to 8 As shown, the present invention provides a nuclear power plant flange thread hole inspection device, the main body of which is composed of a hoisting cup 3, a hoisting frame 4, a motor component 5, a guide column 6, a connecting plate 7, a micro camera 8, a water sprayer 9, a motor driver 10, and a main body connecting plate 12. The probe holder 11 is installed at the lower end of the motor component 5 to realize the ultrasonic inspection function of the flange surface thread area, and the video connecting plate 13 and the micro camera 8 are installed to realize the video inspection function of the inner side of the threaded hole.

[0036] The main body connection structure is as follows: the main body connection plate 12 adopts a thin-walled plate structure, and two guide columns 6 are installed on both sides of the lower end of the main body connection plate 12. The two guide columns 6 are connected to the main body connection plate 12 by screws. The guide column 6 adopts a cylindrical structure with a tapered front end. The guide column is made of soft materials, such as polyoxymethylene resin, nylon, etc., to prevent the guide column 6 from damaging the threaded hole when inserted into the threaded hole. The distribution diameter of the two guide columns 6 is the same as the distribution diameter of the threaded holes on the flange surface of the pressure vessel, and the span of the two guide columns 6 is equal to the span between the three guide columns.

[0037] The two guide columns 6 at the upper end of the main connecting plate 12 are distributed on the diameter, and a motor component 5 is installed in the middle of the two guide columns. The motor component 5 is connected to the main connecting plate 12 by screws. A hanging frame 4 is installed on the outside of the motor component 5. The hanging frame 4 is connected to the main connecting plate 12 by screws. The hanging frame 4 can be used as a cover for the motor component 5 to protect the motor component 5.

[0038] A hanging cup holder 3 is installed at the upper end of the hanging frame 4. The hanging cup holder 3 is connected to the hanging frame 4 by screws. The hanging cup holder 3 is connected by a hanging long rod, so that the remote installation operation of the inspection device can be realized.

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

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

[0041] When multiple water sprinklers 9 are installed on the main connecting plates 12 on both sides of the motor component 5 to perform ultrasonic inspection on the threaded hole flange surface, the water sprinklers 9 spray water in the inspection area of ​​the pressure vessel flange surface through the water pipe to ensure the coupling between the probe and the inspection surface. The micro camera 8 is connected to the main connecting plate 12 through the connecting plate 7. Multiple micro cameras 8 are arranged around the motor component 5, and their viewing angles face the lower end inspection area to realize the real-time monitoring function of the inspection device.

[0042] The method of using the nuclear power plant flange surface threaded hole inspection device provided by the present invention is as follows:

[0043] like Figures 3 to 6 As shown, when ultrasonic inspection of the threaded area of ​​the flange surface of the nuclear reactor pressure vessel is performed, a long rod is used to connect the lifting cup holder 3 on the inspection device, and hoisted to the top of the threaded hole 1 on the flange surface 2 of the pressure vessel, and the guide columns 6 on both sides of the inspection device are inserted into the two adjacent threaded holes 1 to be inspected, so as to realize the rapid installation and positioning of the inspection device. The water sprayer 9 on the inspection device sprays water for probe coupling to the inspection area around the threaded hole through the water pipe, and the constant force spring structure on the ultrasonic probe holder 11 makes the ultrasonic probe fit with the inspected surface, and the motor component 5 drives the ultrasonic probe holder 11 to rotate around the thread axis to realize ultrasonic inspection of the threaded hole area on the flange surface, and the multiple miniature cameras 8 above the probe holder 11 monitor the inspection status of the probe. After the ultrasonic inspection of the threaded hole to be inspected is completed, the threaded hole inspection device can be installed on the adjacent threads in turn by using the long rod to continue the ultrasonic inspection work.

[0044] like Figure 7 and Figure 8 As shown, when conducting a video inspection of the inner side of the thread on the flange surface of a nuclear reactor pressure vessel, the ultrasonic probe holder 11 needs to be quickly replaced with a video connection plate 13 with multiple miniature cameras 8, and a long rod is used to connect the lifting cup holder 3 on the inspection device, and hoist it above the threaded hole 1 on the flange surface 2 of the pressure vessel, and the guide columns 6 on both sides of the inspection device are inserted into the two adjacent threaded holes of the threaded hole 1 to be inspected, so as to realize the rapid installation and positioning of the inspection device. The motor component 5 drives the multiple miniature cameras 9 to rotate around the threaded hole axis in the threaded hole to realize the video inspection of the inner side of the threaded hole 1, and the multiple miniature cameras 8 above the video connection plate 13 monitor the video inspection status of the lower end. After the video inspection of the threaded hole to be inspected is completed, the threaded hole inspection device can be installed on the adjacent threads in turn using the long rod to continue the video inspection of the inner side of the threaded hole.

[0045] The nuclear power plant flange surface threaded hole inspection device provided by the present invention has the following advantages:

[0046] (1) Double guide post positioning structure based on threaded hole features on the flange surface of nuclear reactor pressure vessel. By utilizing the features 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 realizing rapid positioning of the threaded hole inspection device on the flange surface of the pressure vessel.

[0047] (2) Remote hoisting installation operation mode. The multi-section long rod is connected to the hoisting cup holder to realize the remote installation and removal of the inspection device. The long rod can quickly realize the switching inspection between different detection holes.

[0048] (3) Multiple micro cameras and water sprinklers are arranged around the ultrasonic probe holder and the video inspection micro camera. The multiple micro cameras can monitor the inspection status of the inspection area in real time, and the water sprinklers can provide water coupling for remote ultrasonic inspection.

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

[0050] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A nuclear power plant flange surface threaded hole inspection device, characterized in that: The invention comprises a main body connecting plate (12), two guide columns (6) are installed on both sides of the lower end of the main body connecting plate (12), a motor component (5) is arranged between the two guide columns (6), a motor driving component (10) is installed at the output end below the motor component (5), and a detection component is arranged on the motor driving component (10).

2. The nuclear power plant flange surface threaded hole inspection device according to claim 1, characterized in that: The detection component is a probe holder (11), and the motor component (5) drives the probe holder (11) to scan around the threaded hole (1) on the flange surface (2) of the pressure vessel.

3. The nuclear power plant flange surface threaded hole inspection device according to claim 1, characterized in that: The detection component is a video connection board (13), a micro camera (8) is provided on the video connection board (13), and the motor component (5) drives the micro camera (8) to perform video inspection around the axis of the threaded hole in the threaded hole (1).

4. The nuclear power plant flange surface threaded hole inspection device according to claim 1, characterized in that: A hanging cup seat (3) is provided above the motor component (5), and the hanging cup seat (3) is connected to a long rod.

5. The nuclear power plant flange surface threaded hole inspection device according to claim 4, characterized in that: A hanging frame (4) is provided on the peripheral side of the motor component (5), and the hanging cup holder (3) is installed on the top of the hanging frame (4).

6. The nuclear power plant flange surface threaded hole inspection device according to claim 1, characterized in that: A water sprayer (9) is provided on the main body connecting plate (12).

7. The nuclear power plant flange surface threaded hole inspection device according to claim 1, characterized in that: A connecting plate (7) is mounted on the main connecting plate (12), and a miniature camera (8) facing downward is provided on the connecting plate (7).

8. The nuclear power plant flange surface threaded hole inspection device according to claim 1, characterized in that: The axial distance between the two guide columns (6) is equal to twice the axial distance between the two adjacent threaded holes (1).

9. The nuclear power plant flange surface threaded hole inspection device according to claim 8, characterized in that: The diameter of the guide column (6) is equal to the diameter of the threaded hole (1).

10. The nuclear power plant flange surface threaded hole inspection device according to claim 1, characterized in that: The guide column (6) is a cylindrical structure with a tapered bottom.

Images