CN111325044B - Method for determining new component code of nuclear power station, identification system and identification method - Google Patents
Method for determining new component code of nuclear power station, identification system and identification method Download PDFInfo
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- CN111325044B CN111325044B CN202010077640.8A CN202010077640A CN111325044B CN 111325044 B CN111325044 B CN 111325044B CN 202010077640 A CN202010077640 A CN 202010077640A CN 111325044 B CN111325044 B CN 111325044B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/1408—Methods for optical code recognition the method being specifically adapted for the type of code
- G06K7/1413—1D bar codes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
- B41J2/31—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using a print element with projections on its surface impacted or impressed by hammers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/01—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for special character, e.g. for Chinese characters or barcodes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/1408—Methods for optical code recognition the method being specifically adapted for the type of code
- G06K7/1417—2D bar codes
Abstract
The invention discloses a method for determining a new component code of a nuclear power station, an identification system and an identification method, wherein the code determination method comprises the following steps: setting A multiplied by B codes on a new assembly of the nuclear power station for identification test, and determining A1 expected sizes and B1 expected depth values of the codes; carrying out identification tests on the A1 multiplied by B1 codes, and determining the expected installation angle of the identification device; mounting the identification device at a desired mounting angle and performing the steps of: for A1 xB 1 codes, carrying out recognition test by taking the offset angle of the codes relative to the center of the visual field of the recognition device as a variable, and determining A2 expected sizes and B2 expected depth values of the codes; for the A2 xB 2 codes, taking the offset angle as a variable, carrying out identification test on the codes through a first opening of the guide pipe by using an identification device, and determining A3 expected sizes and B3 expected depth values of the codes; for A3 xB 3 kinds of codes, recognition experiments are carried out by taking the moving speed of the codes as a variable, and the optimal expected size and the optimal expected depth value of the codes are determined.
Description
Technical Field
The embodiment of the invention relates to the technical field of nuclear engineering, in particular to a method for determining a new component code of a nuclear power station, an identification system and an identification method.
Background
The various components in a nuclear reactor are important elements for maintaining chain reaction and reactor power control, all components have unique numbers, and the transfer and operation of the components are very important. In order to ensure the correctness of the component operation, it is necessary to identify the component number.
However, in the existing fields of pressurized water reactors, fast reactors and the like, no identification device is arranged for automatically judging the serial number of the component in the plugging operation and transportation process of the component, so that the plugging error and the transportation error of the component are possibly caused by human errors, and the loss and even the danger are caused.
The component number marked by the plain code does not have an error correction function, the recognition rate is low, one digit is blocked or stained, the whole number cannot be recognized, and the method is not suitable for automatically reading the component number of the nuclear power station. Therefore, the marking method of the nuclear power station component numbers must be modified and innovated, and the error correction capability, the reading rate and the anti-pollution capability of the nuclear power station component numbers are improved. The component number coding is realized currently, and is marked at a certain position of the component, and the component code is identified through a code identification device.
Disclosure of Invention
The present invention is directed to a method for determining a new component code for a nuclear power plant, an identification system and an identification method thereof, so as to solve at least one aspect of the above technical problems.
According to one aspect of the invention, a method for determining new component codes of a nuclear power plant is provided, which comprises the following steps: setting A multiplied by B codes jointly limited by A sizes and B depth values on a new assembly of the nuclear power plant, and performing identification test on the codes by using an identification device to determine A1 expected sizes and B1 expected depth values of the codes; for A1 xB 1 codes, performing identification tests on each code by using an identification device with a plurality of installation angles to determine the expected installation angle of the identification device; mounting the identification device at the desired mounting angle and performing the steps of: performing a recognition test on A1 xB 1 codes by taking the offset angle of the codes relative to the center of the visual field of the recognition device as a variable to determine A2 expected sizes and B2 expected depth values of the codes; for the A2 xB 2 codes, performing identification test on the codes through the first opening of the guide tube by using the identification device by taking the offset angle as a variable to determine A3 expected sizes and B3 expected depth values of the codes; and for the A3 xB 3 codes, carrying out recognition test by taking the moving speed of the codes as a variable to determine the optimal expected size and the optimal expected depth value of the codes.
According to some embodiments, performing an identification test on the a × B codes comprises: placing the A x B codes on a control rod assembly and performing identification tests to determine a1 desired sizes and B1 desired depth values of the codes; and for a1 xb 1 encodings, set on the fuel rod assembly and subjected to identification testing to determine the a1 desired sizes of encodings and B1 desired depth values.
According to some embodiments, performing identification testing on the a1 × B1 codes comprises: arranging the A1 XB 1 codes on a control rod assembly, and carrying out identification tests at a plurality of offset angles to determine a2 expected sizes and B2 expected depth values of the codes; and placing a2 xb 2 codes on the fuel rod assembly and performing identification tests at a plurality of the offset angles to determine a2 desired sizes of codes and B2 desired depth values.
According to some embodiments, the method further comprises: identification tests of the a2 xb 2 codes included: arranging the A2 XB 2 codes on a control rod assembly, and performing identification test on the codes through a first opening of a guide pipe by using the identification device to determine a3 expected sizes and B3 expected depth values of the codes; and providing A3 x B3 codes on the fuel rod assembly, and performing identification test on the codes through the first opening of the guide pipe by using the identification device to determine A3 expected sizes and B3 expected depth values of the codes.
According to some embodiments, the method further comprises: identification tests of the a3 xb 3 codes included: locating the a3 xb 3 codings on a control rod assembly and setting the control rod assembly to move at a plurality of speeds, identifying the codings with the identification device to determine a4 desired sizes of codings and B4 desired depth values; and providing a4 xb 4 codes on the fuel rod assembly and arranging the fuel rod assembly to move at a plurality of speeds, and recognizing the codes with the recognition device to determine the optimal desired size and optimal desired depth value of the codes.
According to some embodiments, the recognition effect of the code is judged based on the recognition time and the recognition rate of the code.
According to some embodiments, the a sizes are no more than 16% of the diameter of the new component at the location of the coded mark; and the depth values of the B types are within a range of not more than 500 [ mu ] m.
According to some embodiments, the code is formed using a pin marking device.
According to another aspect of the present invention, there is provided an identification system for a new component code of a nuclear power plant, comprising: a needle marking device configured to form a desired code on a head of a new component, the desired code having the optimal desired depth value and the optimal desired size determined according to the code determination method; a new component loader configured to transfer a new component formed with a desired code, the new component loader including a guide tube and a guide post, the new component being disposed in the guide tube and moving together with the guide tube relative to the guide post, the guide tube having a first opening, the guide post having a second opening; and an identification device and a polarized light source mounted within the second aperture, the polarized light source being capable of illuminating a desired code of the new assembly through the first aperture, the identification device being capable of identifying the desired code through the first aperture; wherein the second opening has an inclination such that the identification device has the desired installation angle determined by the code determination method.
According to some embodiments, the position of the first opening is determined based on the position of the second opening and the position of the guide tube of the new component loader.
According to some embodiments, the head of the new assembly includes a plurality of arcuate surfaces separated by a plurality of grooves, each of the plurality of arcuate surfaces having the desired code disposed thereon.
According to another aspect of the present invention, there is provided a method for identifying a new component code using the identification system, comprising: forming a desired code on the head of the new assembly using a pin marking device; and transferring the new component formed with the desired code using a new component loader; wherein during the transfer of the new component by the new component loader, the desired code is illuminated with a polarized light source and identified with an identification device to confirm the new component being operated.
In the method for determining the new component code of the nuclear power plant according to the embodiment of the invention, by determining the optimal expected depth value and the optimal expected size of the code and the expected installation angle of the identification device and setting the polarized light source, the identification device can be ensured to have good identification effect on the code which is in the dark environment of the new component loader and moves, so that the new component which is in operation can be automatically identified simultaneously in the transportation process of the new component, the component information can be mastered more comprehensively and reliably without influencing the existing process, and the reliability of the component operation is improved.
Drawings
Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.
FIG. 1 shows a schematic diagram of the structure of a new assembly according to an exemplary embodiment of the present invention;
fig. 2 shows a schematic view of the header of the new assembly of fig. 1;
FIG. 3 shows a schematic diagram of the encoding of a new component according to an exemplary embodiment of the present invention;
fig. 4 shows a schematic view of the installation angle of the identification device according to an exemplary embodiment of the present invention;
FIG. 5 illustrates a flow diagram of a method for determination of new component codes for a nuclear power plant in accordance with an exemplary embodiment of the present invention;
fig. 6 shows a schematic structural diagram of a new component loader according to an exemplary embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components.
In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in schematic form in order to simplify the drawing.
The nuclear power plant components include new components and spent components, wherein the components prior to entering the nuclear reactor are referred to as new components and the components exiting the nuclear reactor are referred to as spent components. The types of nuclear power plant components may include, for example, fuel rod assemblies, control rod assemblies, and the like. Fig. 1 shows a schematic structural diagram of a new assembly 10 according to an exemplary embodiment of the present invention, and fig. 2 shows a schematic diagram of a head 11 of the new assembly 10 of fig. 1. As shown in fig. 1-2, taking the example of a fuel rod assembly, the novel assembly 10 includes a head section 11, a fuel section 12, and a leg section 13. The new assembly 10 is generally cylindrical in shape and the head 11 comprises a plurality of arcuate surfaces separated by a plurality of slots. Referring to fig. 2, six grooves are formed on the cylindrical surface of the head 11, and the six grooves equally divide the cylindrical surface to form six circular arc surfaces. One for each coolant outlet hole.
In nuclear reactors, the new assemblies 10 are of a wide variety and number, with each new assembly 10 having a unique number. In an embodiment of the invention, the new components entering the reactor are identified and checked for correctness by automatic identification techniques. The number of the plain code label is an eight-digit number, the plain code label has no error correction function, the identification rate is low, one digit is blocked or stained, the whole number cannot be identified, and the plain code label is not suitable for automatically reading the number of the nuclear power plant component, so that the conventional number label needs to be converted into a code label to improve the reading rate and the reliability of the code. The encoding includes one-dimensional encoding and two-dimensional encoding, both of which have an error correction function. Specifically, the two-dimensional code includes a DM code and a QR code. The invention carries out comparative analysis on the data type, the data quantity, the safety reliability, the recognition rate, the error correction capability and the like of the one-dimensional code and the two-dimensional code (DM code and QR code), and the result is shown in the table 1.
TABLE 1 one-dimensional code, two-dimensional code (DM code and QR code) analysis comparison
According to the comparison, the coding modes all meet the requirement of 8-bit digital coding; compared with one-dimensional coding, the two-dimensional coding has the advantages of large information amount, safety, reliability, high recognition rate, strong error correction capability and the like. Both the DM code and the QR code have strong error correction capability, but the DM code has more excellent performance in code damage, and some bar codes can be accurately read only by reading 20% of data; meanwhile, the size of the DM code can be adjusted at will, and can be up to 14 square inches at most, and can be up to 0.0002 square inches at most, which is also the smallest size in the current one-dimensional codes and two-dimensional codes. Therefore, the encoding form of the present invention preferably employs a DM code. Further, the DM code type selected by the present invention is ECC 200. The ECC200 generates a polynomial calculation error correction code using a Reed-Solomon algorithm, which is an excellent error correction code having the capability of correcting burst errors and random errors, while correcting burst errors more efficiently, and its error correction capability and coding efficiency are the highest in linear block codes.
The outer surface material of the new assembly is generally stainless steel, the appearance is cylindrical, and the new assembly is applied to a radiation environment. The material, shape and environment of application of the outer surface of the new component place limitations and requirements on the manner in which the code is formed on the new component. The existing methods for processing permanent marks generally use direct Part marking technology dpm (direct Part marking), which is a technology for directly marking a machine-readable code on the surface of a product or a Part. DPM techniques can be divided into:
laser Marking technology (Laser Marking), wherein Laser interacts with a material, the temperature of a material heat affected zone rapidly rises in a short time, so that the surface of the processed material is melted, ablated, even vaporized and the like, thereby forming a mark;
electrochemical Etching technology (Electro-Chemical Etching) that prints a pre-designed and printed template on a material using an electron/Chemical reaction;
inkjet Marking (Ink Jet Marking), an inkjet printer for DPM, which is based on the same principle as a conventional PC printer, can accurately eject Ink droplets onto a material surface;
the mechanical point needle marking technology (Dot Peen) uses a carbide or diamond pen point to strike the surface of a material in a pneumatic or electromechanical mode to form a permanent dent, and the current marking technology of two-dimensional coding is electromagnetic point needle marking.
The results of comparative analysis of the four DPM labeling techniques are shown in Table 2.
TABLE 2 DPM labelling technique analysis
According to the analysis, the four marking technologies can meet the requirement of marking on metal materials, but the electrochemical marking and marking speed is low, and the electrochemical marking and marking technology generates chemical reaction with metal, so that the electrochemical marking and marking technology is not suitable for being used as a marking technology of a new component; inkjet marking is weak against wear and is not suitable for use as a marking technique for new components.
The invention respectively tests the marking effect of the laser marking technology and the point marking technology, and finds that the problems of overlong marking time (about 300s), workpiece melting and poor coding quality exist when the laser marking technology is used for reaching the coding depth of more than 100 mu m; the codes obtained by using the point needle marking technology are clear and have short marking time. In addition, the components are immersed in the core coolant for a long time, and the high temperature and strong corrosiveness of the coolant heat the code and cause a chemical corrosion reaction to occur. The method simulates the high-temperature and strong-corrosivity environment of the reactor core to carry out immersion test on the component codes, two test samples marked by the point needle and the laser are placed in simulated high-temperature and strong-corrosivity liquid to be continuously heated for 240 hours, and after the test samples are taken out and cleaned, the test samples marked by the point needle are found to be only blackened in surface and lose metal luster; the laser marked sample not only becomes dark on the surface and loses metal luster, but also has poor coding contrast, the edge area is worn and the black area is reduced and corroded, namely the laser mark can form unstable oxide on the metal surface, and the metal oxide is quickly reduced in high-temperature strong corrosive liquid, so that the reactor core coolant is polluted by oxygen and metal impurities, and the purity of the reactor core coolant is influenced.
Therefore, the two-dimensional code marked by the needle is better in corrosion resistance than the two-dimensional code marked by the laser, and the reading rate is correspondingly higher. Fig. 3 shows a schematic view of a code 21 of the new assembly according to an exemplary embodiment of the invention, the pattern of the code 21 being constituted by a plurality of dots formed by dot-needle marking with a needle marking device as shown in fig. 3.
The recognition effect of the new component code 21 depends on the size and depth of the code, and the code is too deep and small in size, so that the code is too dense and is not easy to recognize; the code is too shallow and too large in size, resulting in too sparse and difficult to identify code. Meanwhile, the position of the new component marking code is a cylindrical surface, the larger the code marking size is, the larger the influence of the cambered surface bending is, and the more difficult the code is to be identified; however, the smaller the code size is, the greater the proportion of the code part contaminated is under the same contamination degree, and the subsequent recognition effect is affected.
In addition, the identification angle of the identification device can also influence the identification effect, and when the lens of the identification device faces the code at a certain angle instead of facing the code, the contrast between the code and the surface of a new component can be enhanced, so that the good identification effect is achieved. Fig. 4 is a schematic view showing a mounting angle of the recognition device 41 according to an exemplary embodiment of the present invention, and as shown in fig. 4, the recognition device 41 is mounted at an angle α with respect to the horizontal direction, the mounting angle determines the recognition angle of the recognition device 41, and the angle α is also between the lens facing direction of the recognition device 41 and the horizontal direction.
Therefore, the coding size, the coding depth value and the installation angle of the identification device of the new component are the key for determining the coding identification effect, and the invention provides a method for selecting the proper coding size, the proper coding depth value and the proper installation angle of the identification device.
Fig. 5 shows a flowchart of a method for determining a new component code of a nuclear power plant according to an exemplary embodiment of the present invention, which may include, as shown in fig. 5:
s1, aiming at A multiplied by B codes jointly limited by A sizes and B depth values, arranging the A multiplied by B codes on a new assembly of the nuclear power plant, and carrying out identification test on the A multiplied by B codes by using an identification device to determine the A1 expected sizes and the B1 expected depth values of the codes;
s2, aiming at the A1 multiplied by B1 codes, performing identification test on each code by using an identification device with a plurality of installation angles to determine the expected installation angle of the identification device;
mounting the identification device at the desired mounting angle and performing the steps of:
s3, aiming at the A1 multiplied by B1 codes, carrying out recognition test by taking the offset angle of the codes relative to the center of the visual field of the recognition device as a variable, so as to determine the A2 expected sizes and B2 expected depth values of the codes;
s4, aiming at the A2 xB 2 codes, performing identification test on the codes through the first opening of the guide tube by using the identification device by taking the offset angle as a variable to determine the A3 expected sizes and B3 expected depth values of the codes; and
and S5, for the A3 × B3 codes, carrying out recognition test by taking the moving speed of the codes as a variable to determine the optimal expected size and the optimal expected depth value of the codes.
In the method for determining the new component code according to the embodiment of the invention, the optimal expected depth value, the optimal expected size and the expected installation angle of the identification device of the code are determined, so that the identification device can be ensured to have good identification effect on the code in a motion state, and therefore, in the transportation process of the new component, the new component in operation can be automatically identified at the same time, so that the component information can be mastered more comprehensively and reliably under the condition of not influencing the existing technological process, and the reliability of the component operation is improved.
In the above steps, the recognition effect of the code may be determined based on the recognition time and the recognition rate of the code, that is, the recognition device is used to recognize each code, the shorter the recognition time is, the better the recognition effect is, the higher the recognition rate is, the better the recognition effect is, and the size, the depth value and the installation angle corresponding to the code with good recognition effect are selected. The A sizes are not more than 16% of the diameter of the new component at the position of the code mark, namely the code width is not more than 16% of the diameter of the new component at the position of the code mark; the depth values of the B types are within the range of not more than 500 mu m. Each code is a DM code formed using a pin marking device.
Through step S1, the range of the encoded sizes may be narrowed down according to the recognition effect of the encoding of the a sizes, and the a1 kinds of desired sizes may be re-determined within the range, while the range of the encoded depth values may be narrowed down according to the recognition effect of the encoding of the B kinds of depth values, and the B1 kinds of desired depth values may be re-determined within the range, after which the recognition test of step S2 is performed.
Specifically, in step S1, the performing the identification test on the a × B codes may include:
placing the A x B codes on a control rod assembly and performing identification tests to determine a1 desired sizes and B1 desired depth values of the codes; and
for the a1 xb 1 encodings, they were mounted on a fuel rod assembly and subjected to identification testing to determine the a1 desired sizes of encodings and the B1 desired depth values.
Because the outer diameter of the control rod assembly at the code mark position is smaller than the outer diameter of the fuel rod assembly at the code mark position, the code on the control rod assembly is greatly influenced by the curvature of the curved surface for the code with the same size, namely, the code with the same size is more seriously deformed and is less easily recognized on the control rod assembly than on the fuel rod assembly, so that the control rod assembly can be tested firstly, a first size range is determined according to the test results of A sizes, and a1 expected sizes are determined in the range; similarly, a first range of depth values may be determined, and b1 desired depth values within the range may be determined; then a1 × B1 codes defined by a1 expected sizes and B1 depth values together are set on the fuel rod assembly for identification test, a second size range and a second depth value range are determined according to the test results of a1 expected sizes and B1 depth values, and A1 expected sizes and B1 expected depth values of step S2 are determined from the second size range and the second depth value range. In step S1, the installation angle of the recognition device, the offset angle of the code with respect to the center of the field of view of the recognition device, and the moving speed of the component are all determined values, and no guide tube is provided.
In step S2, the angle of deviation of the code from the center of the field of view of the recognition device and the moving speed of the component are both determined values, and no guide tube is provided.
In step S3, the identification test of the a1 × B1 codes includes:
arranging the A1 XB 1 codes on a control rod assembly, and carrying out identification tests at a plurality of offset angles to determine a2 expected sizes and B2 expected depth values of the codes; and
a2 xb 2 encodings are provided on the fuel rod assembly and identification testing is performed at a plurality of the offset angles to determine the a2 desired sizes of encodings and the B2 desired depth values.
In step S3, the installation angle of the recognition device and the moving speed of the component are both determined values, and no guide pipe is provided.
Specifically, the recognition device is installed at the desired installation angle, each code is set to have a plurality of offset angles with respect to a center of a field of view of the recognition device, and each code is recognized at the plurality of offset angles. And analyzing and processing the obtained data of different code reading times, counting the times of successful code reading to obtain the average identification time and identification rate of each code under different offset angles, and selecting the expected size according to the principle of shortest identification time and highest identification rate.
When a part of the code enters the visual field range of the identification device, the code can be identified, so that the deviation angle is added for comprehensive consideration, and the selection result can be ensured to be more reasonable.
For new components, the transportation process includes transferring with a new component loader, which is the main equipment for new component process transportation and whose function is to pick up and insert new components. Fig. 6 shows a schematic structural view of a new component loader 30 according to an exemplary embodiment of the present invention, and as shown in fig. 6, the new component loader 30 includes a guide post 32 and a guide tube 31 provided in the guide post 32, a gripping device controlled by a wire rope grips and inserts the new component, the new component moves up and down in a vertical direction in the guide tube 31 and together with the guide tube 31, and the guide post 32 is fixed to a mechanical device and can horizontally rotate in a certain arc. The present invention recognizes the code during the transfer of the new component by the new component loader, and therefore, it is necessary to provide the second opening 34 on the guide post 32 for installing the recognition means, and accordingly, to provide the first opening 33 on the guide tube 31 so that the code of the new component is exposed to the visual field of the recognition means, and the blocking of the wall of the guide tube is avoided.
In step S4, the identification test of the a2 × B2 codes includes:
arranging the A2 XB 2 codes on a control rod assembly, and performing identification test on the codes through a first opening of a guide pipe by using the identification device to determine a3 expected sizes and B3 expected depth values of the codes; and
the A3 xb 3 codes are provided on the fuel rod assembly, and the codes are subjected to identification testing through the first opening of the guide tube using the identification device to determine the A3 desired sizes and B3 desired depth values of the codes.
Wherein the identification device is mounted at the desired mounting angle, the code is arranged to have a plurality of offset angles relative to a center of a field of view of the identification device at which the desired code is identified through the first aperture. Whether the recognition device can successfully read or not is counted, the reading time is calculated, and the A3 expected sizes and the B3 expected depth values of the codes are further determined based on the recognition time and the recognition rate.
In step S4, the installation angle of the recognition device and the moving speed of the component are both determined values.
In step S5, the identification test of the A3 × B3 codes includes:
locating the a3 xb 3 codings on a control rod assembly and setting the control rod assembly to move at a plurality of speeds, identifying the codings with the identification device to determine a4 desired sizes of codings and B4 desired depth values; and
providing a4 xb 4 codes on a fuel rod assembly and arranging the fuel rod assembly to move at a plurality of speeds, and identifying the codes with the identification device to determine the optimal desired size and optimal desired depth value of the codes.
In step S5, the installation angle of the recognition device, the offset angle of the code with respect to the center of the field of view of the recognition device are all determined values, and no guide tube is provided.
The consideration of the motion state is added, so that the determined code is ensured to be suitable for the real environment.
Up to this point, according to the above method, an appropriate code size, a code depth value, and an installation angle of the recognition device can be determined.
According to another aspect of the present invention, there is provided an identification system for a new component code of a nuclear power plant, comprising:
a needle marking device arranged to form a desired code at the head of the new component, the desired code having the optimal desired depth value and the optimal desired size determined according to the above code determination method;
a new component loader 30 configured to transfer a new component formed with a desired code, the new component loader 30 including a guide tube 31 and a guide post 32, the new component being disposed in the guide tube 31 and moving together with the guide tube 31 relative to the guide post 32, the guide tube 31 having a first opening 33, the guide post 32 having a second opening 34; and
an identification device mounted within the second aperture 34 and a polarized light source capable of illuminating the desired code of the new assembly through the first aperture 33, the identification device being capable of identifying the desired code through the first aperture 33;
wherein the second bore 34 has an inclination such that the identification device has said desired mounting angle determined according to the above code determination method.
The identification device is mounted along the second aperture 34 at the same desired mounting angle as the angle of inclination of the second aperture. The second opening 34 may extend through a side wall of one side of the guide post. The identification device is provided with a polarized light source which can provide illumination for the identification of the code in the dark environment of the guide post. The position of the first opening 33 is determined according to the position of the second opening 34 and the position of the guide tube of the new component loader 30 so that the first opening 33 can expose the new component code when the new component code enters the field of view of the identification means.
The expected code is arranged at the head of the new component, and when the new component moves in the new component loader 30, the head of the new component is firstly exposed in the visual field range of the identification device, so that the code of the new component can be firstly identified, the identification device sends the identification result to the monitoring unit, and the identification result is compared with the preset information stored by the monitoring unit to judge whether the captured new component is correct or not; in addition, the new component loader drives the grabbing device to drive the new component to move up and down in the guide pipe by adopting a steel wire rope, the steel wire rope connection is flexible connection, so that the component can deviate from an axis to swing left and right, the swing amplitude of the head of the component is smaller than that of the pin section of the component, and the code is arranged on the head, so that the stable identification of the code is facilitated; furthermore, the new assembly head has a minimum radiation dose and minimal radiation damage to the identification means.
In order to increase the redundancy and reliability of the identification of the new component code, the invention provides the desired code on a plurality of circular arc surfaces of the head of the new component, considering that the installation position of the identification device is fixed, and the position of the desired code on the new component is uncertain relative to the orientation of the identification device.
According to another aspect of the present invention, there is provided a method for identifying a new component code using the identification system, comprising:
forming a desired code on the head of the new assembly using a pin marking device; and
transferring a new component formed with a desired code using a new component loader;
wherein during the transfer of the new component by the new component loader, the desired code is illuminated with a polarized light source and identified with an identification device to confirm the new component being operated.
In some embodiments, a method of identifying a new component code may include:
forming a desired code on the head of the new assembly using a pin marking device;
calculating the visual field range of the recognition device according to the size of the coding mark area, and calculating the image resolution of the recognition device according to an empirical formula, thereby selecting a recognition device with a certain specification; calculating the focal length of the lens of the recognition device according to the distance (object distance) between the recognition device and the new component code and the view field range, thereby selecting a proper lens; determining the size of a first opening of the guide pipe according to the visual field range of the recognition device; and
transferring a new component formed with a desired code using a new component loader;
wherein during the transfer of the new component by the new component loader, the desired code is illuminated with a polarized light source and identified with an identification device to confirm the new component being operated.
The invention can also carry out irradiation test on the identification device through neutron irradiation test, and judge the time for which the identification device can reliably work, comprising the following steps: simulating an environment in which the identification device is located when the new component loader grabs the new component from the new component transport container; calculating the total neutron fluence born by the identification device in a certain time, and reserving a margin; selecting a single-energy neutron from various neutron irradiations actually born by the identification device; and enabling the identification device to be continuously irradiated by the single-energy neutrons to enable the identification device to reach the total neutron fluence. In the test process, the identification device continuously performs a code identification test, monitors the code identification time, judges whether the identification device fails in the neutron irradiation process, and can reliably work in the time if the identification device does not fail all the time; if it fails at a certain time, the identification means can only reliably operate reliably in the time preceding that time.
Although the present invention has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to be illustrative of embodiments of the invention and should not be construed as limiting the invention. The various components in the drawings are not to scale in order to clearly illustrate the details of the various components, and so the proportions of the various components in the drawings should not be taken as limiting.
Although a few embodiments of the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.
Claims (12)
1. A method for determining a new component code for a nuclear power plant, comprising:
setting A multiplied by B codes jointly limited by A code sizes and B code depth values on a new assembly of the nuclear power plant, performing identification test on the new assembly by using an identification device, and determining A1 expected sizes and B1 expected depth values of the codes based on the identification time and the identification rate of the codes;
for A1 xB 1 codes, performing identification test on each code by using an identification device with a plurality of installation angles, and determining the expected installation angle of the identification device based on the identification time and the identification rate of the codes;
mounting the identification device at the desired mounting angle and performing the steps of:
performing a recognition test by taking a deviation angle of the code relative to the center of the visual field of the recognition device as a variable for the A1 xB 1 codes, and determining A2 expected sizes and B2 expected depth values of the codes based on the recognition time and the recognition rate of the codes;
for the A2 xB 2 codes, performing identification test on the codes through the first opening of the guide pipe by using the identification device by taking the offset angle as a variable, and determining A3 expected sizes and B3 expected depth values of the codes based on the identification time and the identification rate of the codes; and
for A3 xB 3 kinds of encodings, a recognition test is performed with the moving speed of the encodings as a variable, and based on the recognition time and recognition rate of the encodings, the optimal desired size and optimal desired depth value of the encodings are determined.
2. The method of claim 1, wherein performing an identification test on the A x B codes comprises:
setting the A x B codes on a control rod assembly and carrying out identification tests to determine a1 expected sizes and B1 expected depth values of the codes based on the identification time and the identification rate of the codes; and
the a1 x B1 codes were placed on the fuel rod assembly and subjected to identification testing to determine the a1 desired sizes and B1 desired depth values of the codes based on the identification time and identification rate of the codes.
3. The method of claim 1, wherein performing the identification test on the a1 x B1 codes comprises:
arranging the A1 xB 1 codes on a control rod assembly, and performing identification tests at a plurality of offset angles to determine a2 expected sizes and B2 expected depth values of the codes based on the identification time and the identification rate of the codes; and
the a2 x B2 codes are arranged on the fuel rod assembly, and identification tests are carried out under a plurality of offset angles, and based on the identification time and the identification rate of the codes, the A2 expected sizes and the B2 expected depth values of the codes are determined.
4. The method of claim 1, wherein performing the identification test on the a2 x B2 codes comprises:
arranging the A2 xB 2 codes on a control rod assembly, performing identification test on the codes through a first opening of a guide pipe by using the identification device, and determining a3 expected sizes and B3 expected depth values of the codes based on the identification time and the identification rate of the codes; and
the A3 x B3 codes are arranged on the fuel rod assembly, the codes are subjected to identification test through the first opening of the guide pipe by using the identification device, and the A3 expected sizes and the B3 expected depth values of the codes are determined based on the identification time and the identification rate of the codes.
5. The method of claim 1, wherein performing the identification test on the a3 x B3 codes comprises:
setting the A3 xB 3 codings on a control rod assembly, setting the control rod assembly to move at a plurality of speeds, recognizing the codings by using the recognition device, and determining a4 expected sizes and B4 expected depth values of the codings based on the recognition time and the recognition rate of the codings; and
providing a4 xb 4 codes on a fuel rod assembly and setting the fuel rod assembly to move at a plurality of speeds, recognizing the codes with the recognition device, and determining the optimal desired size and optimal desired depth value of the codes based on the recognition time and recognition rate of the codes.
6. The method according to any one of claims 1 to 5, wherein the recognition effect of the code is judged based on the recognition time and the recognition rate of the code.
7. The method of claim 1,
the A code sizes are no more than 16% of the diameter of the new component at the code mark position; and
the range of the B encoded depth values is no more than 500 μm.
8. The method of claim 1, wherein the code is formed using a pin marking device.
9. An identification system for new component codes for nuclear power plants, comprising:
a needle marking device arranged to form a desired code at a head of a new component, the desired code having the optimal desired depth value and the optimal desired size determined according to the code determination method of claim 1;
a new component loader configured to transfer a new component formed with a desired code, the new component loader including a guide tube and a guide post, the new component being disposed in the guide tube and moving together with the guide tube relative to the guide post, the guide tube having a first opening, the guide post having a second opening; and
an identification device and a polarized light source mounted within the second aperture, the polarized light source capable of illuminating a desired code of a new assembly through the first aperture, the identification device capable of identifying the desired code through the first aperture;
wherein the second bore has an inclination such that the identification device has the desired installation angle determined according to the code determination method of claim 1.
10. The system of claim 9, wherein the location of the first opening is determined based on the location of the second opening and a guide tube location of the new component loader.
11. The system of claim 9 wherein the head of the new assembly comprises a plurality of arcuate surfaces separated by a plurality of grooves, each of the plurality of arcuate surfaces having the desired code disposed thereon.
12. A method of identifying a new component code using the identification system of claim 9, comprising:
forming a desired code on the head of the new assembly using a pin marking device; and
transferring a new component formed with a desired code using a new component loader;
wherein during the transfer of the new component by the new component loader, the desired code is illuminated with a polarized light source and identified with an identification device to confirm the new component being operated.
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