Device for inspecting welding seam defects on outer surface of MOX fuel assembly

Abstract

The invention belongs to the technical field of automatic detection, and particularly relates to a device for detecting welding seam defects on the outer surface of an MOX fuel assembly. The device comprises a stand column, a supporting seat, an inspection system, a shielding body and a supporting seat, the stand column, the supporting base, the inspection system and the supporting base are all arranged in the shielding body. The stand column is vertically fixed to the supporting base. The supporting seat is movably fixed on the stand column and is used for fixing and supporting the MOX fuel assembly; the inspection system is located on the supporting base and used for detecting the outer surface of the MOX fuel assembly. According to the invention, the overall dimension of the MOX fuel assembly and the weld surface defects can be rapidly and accurately measured and finely identified, the outer surface of the assembly can be deeply identified, the method has the advantages of high automation degree, no need of manual close-range operation and the like, and the risk that personnel are irradiated is reduced at the same time.

Description

Technical Field

[0001] The present application belongs to the field of automatic detection technology, and specifically relates to a device for inspecting weld defects on the outer surface of a MOX fuel assembly. Background Art

[0002] With the continuous development and improvement of new reactor types in nuclear power plants, new nuclear fuel assemblies have also emerged. The research on the surface weld defects and size detection of new MOX fuel assemblies is internationally advanced and domestically leading. Due to the limitation of technical means, the inspection of the weld defects and the external dimensions of such fuel assemblies is still carried out manually with conventional measuring tools and cameras. Due to the limitation of manual labor and backward technology, not only is the speed of product inspection slow and inefficient, but it is also easy to make mistakes during the inspection process, and automatic inspection and identification are impossible.

[0003] Among the fuel elements, the fuel assembly is the most important core component. The detection of weld defects on its outer surface and the precise measurement of its outer dimensions are of great significance for the fuel assembly to be put into the pile and operated in the pile. Because MOX assemblies have stronger radioactivity than traditional pressurized water reactor fuel assemblies, the conventional detection method is to hoist the fuel assembly, and the inspector uses a camera close to the hoisting area outside the shielded wall. The camera moves up and down, and the assembly is rotated by the crane, and the camera is used to observe whether there are defects on the outer surface of the assembly. The disadvantage of this detection is that the detection accuracy is poor, resulting in large errors in the detection results and cannot be quantitatively detected. At the same time, the camera is affected by strong radiation for a long time, and its performance will be reduced.

[0004] At the same time, MOX fuel assemblies have stronger radioactivity than traditional pressurized water reactor fuel assemblies, and MOX fuel assemblies have completely different structural characteristics. Therefore, the appearance inspection method for pressurized water reactor fuel assemblies is difficult to adapt to MOX fuel assemblies, and there is little experience in the design and development of MOX fuel assembly appearance defect inspection equipment in China. Summary of the invention

[0005] The purpose of the present application is to provide a device for inspecting weld defects on the outer surface of a MOX fuel assembly, so as to solve the problem that the prior art is difficult to adapt to MOX fuel assemblies and has poor detection accuracy.

[0006] Technical solution to achieve the purpose of this application:

[0007] The embodiment of the present application provides a device for inspecting weld defects on the outer surface of a MOX fuel assembly, the device comprising: a column, a support seat, an inspection system, a shielding body and a support seat;

[0008] The column, support seat, inspection system and support seat are all arranged in the shielding body; the column is vertically fixed on the support seat; the support seat is movably fixed on the column, and is used to fix and support the MOX fuel assembly; the inspection system is located on the support seat, and is used to detect the outer surface of the MOX fuel assembly.

[0009] Optionally, the device further includes: a base;

[0010] The base is located below the support seat, on which a laser profiler is fixed for detecting the verticality of the MOX fuel assembly.

[0011] Optionally, the device further comprises: a wiping mechanism;

[0012] The wiping mechanism is fixed on the supporting seat and is used for wiping the outer surface of the MOX fuel assembly.

[0013] Optionally, the device further comprises: a spraying device;

[0014] The spray device is located below the wiping mechanism and is used to spray cleaning liquid to clean the outer surface of the MOX fuel assembly.

[0015] Optionally, the inspection system includes: a line laser camera and an illumination light source;

[0016] The outer surface of the MOX fuel assembly is photographed using the line laser camera and the illumination light source, so as to compare the grayscale threshold in the photograph with the set standard defect grayscale threshold.

[0017] Optionally, the device further comprises: an auxiliary mechanism;

[0018] The auxiliary mechanism is arranged outside the shielding body and connected to the supporting seat, and is used for controlling the up and down movement of the supporting seat.

[0019] Optionally, auxiliary mechanisms include: chains and motors;

[0020] The motor is arranged outside the shielding body and connected to the support base through a chain, so as to control the up and down movement of the support base.

[0021] Optionally, the shielding body includes a fixed plate and a movable shielding door.

[0022] The fixed plate and the movable shielding door are both surrounded by the outer sides of the column, the support seat, the inspection system and the support seat.

[0023] The beneficial technical effects of this application are:

[0024] The embodiment of the present application provides a device for inspecting weld defects on the outer surface of MOX fuel assemblies, the device comprising: a column, a support seat, an inspection system, a shield and a support seat; the column, the support seat, the inspection system and the support seat are all arranged in the shield; the column is vertically fixed on the support seat; the support seat is movably fixed on the column, used to fix and support the MOX fuel assembly; the inspection system is located on the support seat, used to inspect the outer surface of the MOX fuel assembly. Due to the low efficiency of the original inspection, it takes 3 hours to complete the work. The embodiment of the present application provides a device for inspecting weld defects on the outer surface of MOX fuel assemblies. It only takes 1 hour and 40 minutes to complete the inspection work. And the stability is very good. After the 2D camera and 3D line laser scanning are completed, the surface defects can be accurately identified, and multiple inspections and verifications are performed. The stability is very good, and the data transmission of the PLC system is accurate and reliable, and there is rarely a phenomenon of data loss. The repeatability is very high. After one inspection is completed, the inspection results are directly recorded to the computer, and no re-inspection is required. It can quickly and accurately measure and identify the dimensions and weld surface defects of MOX fuel assemblies, and can perform in-depth identification of the outer surface of the assembly. It has the advantages of high automation and no need for close-range manual operation, while reducing the risk of personnel being exposed to radiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of a device for inspecting weld defects on the outer surface of a MOX fuel assembly provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the structure of another device for inspecting weld defects on the outer surface of a MOX fuel assembly provided in an embodiment of the present application.

[0027] In the figure:

[0028] 1-base; 2-column; 3-support seat; 4-inspection system; 5-wiping mechanism; 6-injection device; 7-auxiliary mechanism; 8-shielding body; 9-MOX fuel assembly; 10-chain; 11-motor; 12-support seat. DETAILED DESCRIPTION

[0029] In order to make those skilled in the art better understand the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only a part of the embodiments of the present application, not all. Based on the embodiments recorded in the present application, all other embodiments obtained by those skilled in the art without paying creative work are within the scope of protection of the present application.

[0030] See also Figure 1 and Figure 2, which is a schematic diagram of the structure of a device for inspecting weld defects on the outer surface of a MOX fuel assembly provided in an embodiment of the present application.

[0031] The embodiment of the present application provides a device for inspecting weld defects on the outer surface of a MOX fuel assembly, comprising: a column 2, a support seat 3, an inspection system 4, a shielding body 8 and a support seat 12;

[0032] The column 2, the support seat 3, the inspection system 4 and the support seat 12 are all arranged in the shielding body 8; the column 2 is vertically fixed on the support seat 12; the support seat 3 is movably fixed on the column, and is used to fix and support the MOX fuel assembly 9; the inspection system 4 is located on the support seat 3, and is used to detect the outer surface of the MOX fuel assembly 9.

[0033] In one example, the shielding body 8 includes a fixed plate and a movable shielding door. The fixed plate and the movable shielding door are both surrounded by the outer side of the column 2, the support base 3, the inspection system 4 and the support base 12. Figure 1 shown.

[0034] In some possible implementations of the embodiments of the present application, the device may further include: a base 1;

[0035] The base 1 is located below the support base 3 , and a laser profilometer is fixed on the base 1 for detecting the verticality of the MOX fuel assembly 9 .

[0036] In one example, the device further includes: a wiping mechanism 5;

[0037] The wiping mechanism 5 is fixed on the support seat 3 and is used to wipe the outer surface of the MOX fuel assembly 9 .

[0038] In another example, the device further includes: a spray device 6;

[0039] The spray device 6 is located below the wiping mechanism 5 and is used to spray cleaning liquid to clean the outer surface of the MOX fuel assembly 9 .

[0040] In some possible implementations of the embodiments of the present application, the inspection system 4 includes: a line laser camera and an illumination light source;

[0041] The outer surface of the MOX fuel assembly 9 is photographed using the line laser camera and the illumination light source, so as to compare the grayscale threshold in the photograph with the set standard defect grayscale threshold.

[0042] In some possible implementations of the embodiments of the present application, the device further includes: an auxiliary mechanism 7;

[0043] The auxiliary mechanism 7 is disposed outside the shielding body 8 and connected to the support base 3 , and is used to control the up and down movement of the support base 3 .

[0044] In specific implementation, when the main motor of the equipment fails, the auxiliary mechanism 7 can help the support base 3 to descend to the initial position, so as to facilitate the lifting of the MOX fuel assembly 9.

[0045] In one example, the auxiliary mechanism 7 includes: a chain 10 and a motor 11;

[0046] The motor 11 is disposed outside the shielding body 8 and connected to the support base 3 via a chain 10 , so as to control the up and down movement of the support base 3 .

[0047] The specific method of using the device for inspecting weld defects on the outer surface of a MOX fuel assembly provided in an embodiment of the present application is described in detail below with reference to a specific example.

[0048] The present application provides a device for inspecting weld defects on the outer surface of a MOX fuel assembly. When inspecting weld defects on the outer surface of a MOX fuel assembly, the device may include the following steps:

[0049] S1: The MOX fuel assembly 9 to be tested is transferred from the previous process to the testing station and installed into the base 1, so that the MOX fuel assembly 9 to be tested is stable and in a state of being tested.

[0050] S2: Through signal interaction and interlocking control with the automatic transfer system of the MOX fuel assembly 9, the automatic transfer system of the MOX fuel assembly 9 automatically completes positioning, aligns with the detection hole and descends to the detection station I.

[0051] S3: The inspection system 4 moves upward to the inspection area I, takes images of the lower pin joint, the pin, the lower transition joint, etc. of the MOX fuel assembly 9, and simultaneously performs a contour scan of the lower end hexagonal tube weld, and returns to the initial position after completion.

[0052] S4: The MOX fuel assembly 9 continues to descend to the inspection station II, and the inspection system 4 moves upward to the inspection area II to take images of the outer sleeve of the assembly, the upper operating head, etc., and simultaneously perform a contour scan of the upper end hexagonal tube weld.

[0053] S5: After the scanning is completed, the inspection system 4 clamps the component to the fixture and sends a signal to the component automatic transfer system.

[0054] S6: The automatic assembly transfer system releases the MOX fuel assembly 9, and the inspection system 4 takes an image of the portion of the MOX fuel assembly 9 where the operating head is supported.

[0055] S7: The visual recognition system automatically checks the scratches and cleanliness of the outer surface of the MOX fuel assembly 9, the width and height of the weld of the MOX fuel assembly 9, and the appearance quality of the weld of the MOX fuel assembly 9 based on the captured images.

[0056] S8: If the surface cleanliness inspection of the MOX fuel assembly 9 fails, the wiping mechanism 5 is used to wipe the surface, driving the wiping mechanism 5 to move up and down and rotate, and wiping the designated area until the cleanliness requirement is met.

[0057] S9: After all inspections are completed, a signal is sent to the assembly automatic transport system. The assembly automatic transport system clamps the MOX fuel assembly 9, the inspection system 4 releases the clamp and returns to the initial position, and the assembly automatic transport system transports the MOX fuel assembly 9 to the next process.

[0058] The embodiment of the present application provides a device for inspecting weld defects on the outer surface of MOX fuel assemblies, the device comprising: a column, a support seat, an inspection system, a shield and a support seat; the column, the support seat, the inspection system and the support seat are all arranged in the shield; the column is vertically fixed on the support seat; the support seat is movably fixed on the column, used to fix and support the MOX fuel assembly; the inspection system is located on the support seat, used to inspect the outer surface of the MOX fuel assembly. Due to the low efficiency of the original inspection, it takes 3 hours to complete the work. The embodiment of the present application provides a device for inspecting weld defects on the outer surface of MOX fuel assemblies. It only takes 1 hour and 40 minutes to complete the inspection work. And the stability is very good. After the 2D camera and 3D line laser scanning are completed, the surface defects can be accurately identified, and multiple inspections and verifications are performed. The stability is very good, and the data transmission of the PLC system is accurate and reliable, and there is rarely a phenomenon of data loss. The repeatability is very high. After one inspection is completed, the inspection results are directly recorded to the computer, and no re-inspection is required. It can quickly and accurately measure and identify the dimensions and weld surface defects of MOX fuel assemblies, and can perform in-depth identification of the outer surface of the assembly. It has the advantages of high automation and no need for close-range manual operation, while reducing the risk of personnel being exposed to radiation.

[0059] The present application is described in detail above in conjunction with the accompanying drawings and embodiments, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present application. Any content not described in detail in the present application can adopt the existing technology.

Claims

1. A device for inspecting weld defects on the outer surface of MOX fuel assemblies, characterized in that: The device comprises: a column (2), a support seat (3), an inspection system (4), a shielding body (8) and a support seat (12); The column (2), the support seat (3), the inspection system (4) and the support seat (12) are all arranged in a shielding body (8); the column (2) is vertically fixed on the support seat (12); the support seat (3) is movably fixed on the column and is used to fix and support the MOX fuel assembly (9); the inspection system (4) is located above the support seat (3) and is used to detect the outer surface of the MOX fuel assembly (9).

2. The device for inspecting weld defects on the outer surface of MOX fuel assemblies according to claim 1, characterized in that: The device further comprises: a base (1); The base (1) is located below the support base (3), and a laser profiler is fixed on the base to detect the verticality of the MOX fuel assembly (9).

3. The device for inspecting weld defects on the outer surface of MOX fuel assemblies according to claim 1, characterized in that: The device further comprises: a wiping mechanism (5); The wiping mechanism (5) is fixed on the support seat (3) and is used to wipe the outer surface of the MOX fuel assembly (9).

4. The device for inspecting weld defects on the outer surface of MOX fuel assemblies according to claim 3, characterized in that: The device further comprises: a spraying device (6); The spray device (6) is located below the wiping mechanism (5) and is used to spray cleaning liquid to clean the outer surface of the MOX fuel assembly (9).

5. The device for inspecting weld defects on the outer surface of MOX fuel assemblies according to claim 1, characterized in that: The inspection system (4) comprises: a line laser camera and an illumination light source; The outer surface of the MOX fuel assembly (9) is photographed using the line laser camera and the illumination light source, so as to compare the grayscale threshold in the photograph with the set standard defect grayscale threshold.

6. The device for inspecting weld defects on the outer surface of MOX fuel assemblies according to any one of claims 1 to 5, characterized in that: The device further comprises: an auxiliary mechanism (7); The auxiliary mechanism (7) is arranged outside the shielding body (8), connected to the support seat (3), and is used to control the up and down movement of the support seat (3).

7. The device for inspecting weld defects on the outer surface of MOX fuel assemblies according to claim 6, characterized in that: An auxiliary mechanism (7) comprises: a chain (10) and a motor (11); The motor (11) is arranged outside the shielding body (8), connected to the support base (3) through a chain (10), and is used to control the up and down movement of the support base (3).

8. The device for inspecting weld defects on the outer surface of MOX fuel assemblies according to any one of claims 1 to 5, characterized in that: The shielding body (8) comprises a fixed plate and a movable shielding door. The fixed plate and the movable shielding door are both surrounded by the outer sides of the column (2), the support seat (3), the inspection system (4) and the support seat (12).

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