CN118425184B - Quality detection method for thermocouple wires - Google Patents
Quality detection method for thermocouple wires Download PDFInfo
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Abstract
The invention discloses a quality detection method for thermocouple wires, which relates to the technical field of quality detection and comprises the following steps: the method comprises the steps of selecting thermocouple wires, detecting appearance, detecting electrical property quality, detecting tensile property and processing the thermocouple wires, judging whether the thermocouple wires in the batch have appearance defects and electrical property defects or not through the appearance detection, the electrical property detection and the tensile property detection, preventing the thermocouple wires in the batch from having poor performance problems and flowing into markets, and cutting the thermocouple wires into test sections evenly and giving corresponding numbers to the test sections, so that the test sections in defect concentration can be analyzed, quality charge personnel can conveniently judge the adjustment direction of production optimization, the tensile property grade of the thermocouple wires in the batch can be evaluated, and the quality charge personnel can conveniently distribute the thermocouple wires in the batch to corresponding customers according to the requirements of different customers.
Description
Technical Field
The invention relates to the technical field of quality detection, in particular to a quality detection method for thermocouple wires.
Background
The thermocouple wire is used as a core component of the thermocouple, and directly participates in the measurement of temperature and the generation of electromotive force, the composition and the property of the thermocouple wire determine the temperature measuring range and the accuracy of the thermocouple, and in the production process of the thermocouple wire, the thermocouple wire is easy to generate surface appearance defects such as cracks, burrs, interlayers and the like due to the problems of mechanical damage and the like, and the electric performance and the tensile performance of the thermocouple wire are easy to be reduced due to the problems of uneven mixing of synthetic materials and the like, so that the quality of products using the thermocouple wire is easy to be poor, and therefore, the quality detection of the just-generated thermocouple wire is very necessary.
The prior art such as bulletin number is: the invention patent application of CN112785563B discloses a thermocouple quality detection method based on Zernike moment, which comprises the following steps: the method comprises the steps of collecting images of thermocouples and preprocessing, taking Zernike moment of the preprocessed images as characteristics, carrying out fixed dimension mapping and principal component analysis on the characteristics, then carrying out machine learning training to obtain a detection model, and carrying out qualified and unqualified classification detection on the thermocouples to be detected by using the obtained model, thereby effectively and automatically identifying welding forming defects of the thermocouples and overcoming the defects of high labor consumption, long time and easy subjective influence on detection accuracy of manual detection.
The prior art such as bulletin number is: the invention patent application of CN115496142A discloses an abnormality detection method, a device and a storage medium of a blast furnace thermocouple, wherein the method comprises the following steps: s1: selecting a plurality of thermocouples in the blast furnace, which need to be subjected to anomaly detection, and periodically collecting temperature measurement data of a preset time length to obtain a temperature measurement data sequence of each thermocouple temperature measurement point; s2: grouping the selected thermocouples according to the installation position attribute to obtain a two-dimensional array representing the temperature measurement data of each thermocouple temperature measurement point; s3: training the temperature measurement data by using an isolated forest algorithm for each two-dimensional array to obtain the abnormal score of each temperature measurement point, comparing the abnormal score with a preset abnormal score threshold value, and determining the abnormal temperature measurement point in each group of temperature measurement points according to the comparison result.
According to the scheme, the quality detection method of the thermocouple wire generally performs quality detection on the related products after the thermocouple wire is used on the related products, and lacks of quality detection on the thermocouple wire, while the quality detection method of the traditional thermocouple wire generally depends on manpower detection, so that on one hand, the tiny problem on the appearance of the thermocouple wire is difficult to find, on the other hand, the influence of different magnetic field intensities on the temperature measurement accuracy of the thermocouple wire cannot be estimated, and poor thermocouple wire is caused to be used on the related products, so that the quality of the related products is reduced, and even the safety of personnel using the related products is compromised.
Disclosure of Invention
The invention aims to provide a quality detection method for thermocouple wires, which solves the problems in the background technology.
In order to solve the technical problems, the invention adopts the following technical scheme: the invention provides a quality detection method for thermocouple wires, which comprises the following steps: step 1, thermocouple wire selection: after the production of the thermocouple wires in the batch is finished, the type of the composite material of the thermocouple wires in the batch is obtained, each test thermocouple wire is randomly selected, and each test thermocouple wire is cut off evenly, so that each test section and the serial number of each test thermocouple wire are obtained.
Step 2, appearance detection: obtaining appearance images of all test sections of all the test thermocouple wires, screening all the normal-appearance test thermocouple wires and all the abnormal-appearance test sections of all the abnormal-appearance test thermocouple wires, judging whether the appearances of the thermocouple wires in the batch are defective, analyzing the test sections corresponding to all the concerned numbers of the thermocouple wires in the batch if the appearances of the thermocouple wires in the batch are defective, and sending the test sections to a quality responsible person.
Step 3, detecting the electrical property quality: and (3) testing the electric performance and magnetic field interference of each testing section of each appearance normal testing thermocouple wire, judging whether the electric performance of the thermocouple wires in the batch is abnormal, if so, analyzing the testing section corresponding to each electric performance attention number of the thermocouple wires in the batch, and sending the testing section to a quality responsible person, otherwise, carrying out tensile testing on each testing section of each appearance normal testing thermocouple wire.
Step 4, tensile property test: after each testing section of each appearance normal testing thermocouple wire is subjected to tensile testing, each testing section of each appearance normal testing thermocouple wire is subjected to electric performance and magnetic field interference testing again, and the tensile performance grade of the thermocouple wires in the batch is evaluated.
Step 5, thermocouple wire processing: the required tensile property grade of each customer is obtained, and the tensile property grade of the thermocouple wires of the batch and the required tensile property grade of each customer are sent to a quality responsible person.
Preferably, the screening method for each appearance normal test thermocouple wire and each appearance abnormal test section of each appearance abnormal test thermocouple wire specifically comprises the following steps: and obtaining a proper gray scale threshold value and proper gray scale value intervals of the appearance of each composite material type from a local database, and mapping to obtain the proper gray scale value intervals of the appearance of the thermocouple wires of the batch according to the composite material types of the thermocouple wires of the batch.
According to the appearance images of the test sections of the test thermocouple wires, extracting the pixel points of the appearance images of the test sections of the test thermocouple wires, and obtaining the gray values of the pixel points of the appearance images of the test sections of the test thermocouple wires through gray processing.
Comparing the gray value of each pixel point of the appearance image of each test section of each test thermocouple wire with the proper gray value interval of the appearance of the thermocouple wires in the batch to obtain each pixel point in the proper gray value interval in the appearance image of each test section of each test thermocouple wire, and marking the pixel point as each proper pixel point of the appearance image of each test section of each test thermocouple wire.
Calculating the proper gray scale ratio of the appearance image of each test section of each test thermocouple wire, comparing the gray scale ratio with a proper gray scale ratio threshold, marking the test thermocouple wire as an abnormal appearance test thermocouple wire if the proper gray scale ratio of the appearance image of a test section of a certain test thermocouple wire is smaller than the proper gray scale ratio threshold, marking the test section as an abnormal appearance test section, and marking the test thermocouple wire as an normal appearance test thermocouple wire if the proper gray scale ratio of the appearance image of each test section of a certain test thermocouple wire is larger than or equal to the proper gray scale ratio threshold, thereby screening the normal appearance test thermocouple wires and the abnormal appearance test sections of the abnormal appearance test thermocouple wires.
Preferably, the method for judging whether the appearance of the thermocouple wires in the batch is defective comprises the following specific steps: a primary number threshold and a secondary number threshold are obtained from a local database.
Counting the number of the appearance abnormal test thermocouple wires according to the appearance abnormal test thermocouple wires, comparing the number of the appearance abnormal test thermocouple wires with a first-level number threshold, and judging that the appearance of the batch of thermocouple wires is defective if the number of the appearance abnormal test thermocouple wires is larger than the first-level number threshold.
According to each test section and the number of each test section of each test thermocouple wire, the number of each appearance abnormality test section of each appearance abnormality test thermocouple wire is extracted, the appearance abnormality test sections of each appearance abnormality test thermocouple wire corresponding to each number are mapped, the number of appearance abnormality test thermocouple wires of each number is counted, the number of the appearance abnormality test thermocouple wires is compared with a two-level number threshold, and if the number of the appearance abnormality test thermocouple wires of a certain number is larger than the two-level number threshold, the appearance defect of the thermocouple wires of the batch is judged.
Preferably, the electrical performance and magnetic field interference test is performed by the following specific method: and obtaining experimental reference electrodes and proper temperature intervals of each experimental magnetic field intensity, temperature change step values and each synthetic material type from a local database, mapping to obtain the experimental reference electrodes and proper temperature intervals of the thermocouple wires of the batch according to the synthetic material types of the thermocouple wires of the batch, and obtaining each experimental temperature of the thermocouple wires of the batch according to the temperature change step values.
And measuring the thermoelectromotive force difference value of each test section of each normal-appearance test thermocouple wire and the experimental reference electrode under each experimental magnetic field intensity and each experimental temperature, thereby obtaining the thermoelectromotive force difference value of each test section of each normal-appearance test thermocouple wire under each experimental magnetic field intensity and each experimental temperature, and obtaining the thermoelectromotive force difference value of each test section of each normal-appearance test thermocouple wire under the conditions without experimental magnetic field and each experimental temperature.
Preferably, the specific method for judging whether the thermocouple wires in the batch have abnormal electrical performance is as follows: calculating the anti-magnetic field strength deviation coefficient of each test section of each appearance normal test thermocouple wireWherein x is the number of each appearance normal test thermocouple wire,Y is a positive integer greater than 2, n is the number of each test segment,M is a positive integer greater than 2.
Calculating thermoelectric potential energy deviation coefficients of all test sections of all appearance normal test thermocouple wires。
Calculating the electrical property abnormal coefficient of each test section of each appearance normal test thermocouple wireWhere e is a natural constant.
And acquiring an electrical performance abnormal coefficient threshold value from a local database, comparing the electrical performance abnormal coefficient of each test section of each appearance normal test thermocouple wire with the electrical performance abnormal coefficient threshold value, if the electrical performance abnormal coefficient of a certain test section of a certain appearance normal test thermocouple wire is larger than the electrical performance abnormal coefficient threshold value, marking the appearance normal test thermocouple wire as an electrical performance abnormal thermocouple wire, marking the test section as an electrical performance abnormal test section, and screening each electrical performance abnormal test section of each electrical performance abnormal thermocouple wire.
And judging whether the thermocouple wires in the batch have abnormal electrical properties according to a method for judging whether the appearance of the thermocouple wires in the batch has defects.
Preferably, the calculating calculates the deviation coefficient of the intensity of the anti-magnetic field of each test section of each appearance normal test thermocouple wire: obtaining the thermoelectromotive force difference value of the thermocouple wire good product under each experimental magnetic field intensity and each experimental temperature from a local databaseAnd differences in thermoelectromotive force in the absence of experimental magnetic fields and at various experimental temperaturesWherein i is the number of each experimental magnetic field intensity,J is a positive integer greater than 2, r is the number of each experimental temperature,S is a positive integer greater than 2.
According to the thermal electromotive force difference value of each test section of each thermocouple wire for normal test of each appearance under each experimental magnetic field intensity and each experimental temperatureAnd according to the thermal electromotive force difference value of each test section of each thermocouple wire material which is normally tested in each appearance under the conditions of no experimental magnetic field and each experimental temperatureCalculating the deviation coefficient of the anti-magnetic field intensity of each test section of each thermocouple wire for normal appearance test。
Preferably, the thermoelectric energy deviation coefficient of each appearance normal test thermocouple wire is calculated by the specific calculation method: according to the thermal electromotive force difference value of each test section of each thermocouple wire for normal test of each appearance under no experimental magnetic field and each experimental temperatureAnd according to the thermoelectric potential difference value of the good thermocouple wire under the conditions of no experimental magnetic field and all experimental temperaturesCalculating the thermoelectric potential energy deviation coefficient of each thermocouple wire for normal appearance testWhere s is the number of experimental temperatures.
Preferably, the tensile test is carried out on each test section of each thermocouple wire for normal appearance test, and the specific method comprises the following steps: and obtaining experimental tension values and tension experimental time from a local database, applying a force of the experimental tension values to the extending direction at the two ends of each test section of each appearance normal test thermocouple wire by using a mechanical arm, and releasing each test section of each appearance normal test thermocouple wire after the tensile experimental time.
Preferably, the tensile property grade of the thermocouple wires of the present batch is evaluated by the following specific evaluation method: after each test section of each appearance normal test thermocouple wire is subjected to electric performance and magnetic field interference test again, according to a method for judging whether electric performance abnormality occurs in the thermocouple wires of the batch, each electric performance abnormality test section of each electric performance abnormality thermocouple wire subjected to electric performance and magnetic field interference test for the second time is screened, the number A of electric performance abnormality thermocouple wires subjected to electric performance and magnetic field interference test for the first time is counted, the number B of electric performance abnormality thermocouple wires subjected to electric performance and magnetic field interference test for the second time is counted, and the tensile performance coefficient of the thermocouple wires of the batch is calculated。
And obtaining the tensile property grade corresponding to each tensile property coefficient interval from the local database, thereby mapping and obtaining the tensile property grade of the thermocouple wires in the batch.
The invention has the beneficial effects that: (1) According to the invention, step 1. Thermocouple wires are selected, and the subsequent quality detection is facilitated by obtaining each test section of each test thermocouple wire.
(2) And 2, appearance detection is carried out, whether the thermocouple wires in the batch have appearance defects is analyzed, the thermocouple wires in the batch are prevented from being used on related products, the quality of the thermocouple wires is ensured, and meanwhile, the quality of the thermocouple wires is ensured, and the quality responsible persons can conveniently carry out subsequent appearance optimization and adjustment by analyzing the main concentrated appearance defects in the test sections.
(3) And 3. The electric performance quality detection is carried out by simulating the magnetic field intensity and the temperature variation possibly occurring in the practical application, analyzing whether the thermocouple wires in the batch have electric performance defects, preventing the thermocouple wires in the batch from having the electric performance defects and being used on related products, ensuring the quality of the thermocouple wires, and simultaneously, facilitating a quality responsible person to carry out electric performance optimization on the test sections by analyzing the test sections mainly concentrated in the electric performance defects.
(4) Step 4 of the invention, the tensile property test and step 5 of the invention, thermocouple wire processing, through evaluating the tensile property grade of the thermocouple wires of this batch, the quality responsible person can distribute the thermocouple wires of this batch to the corresponding customers according to the demands of different customers conveniently.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of the method of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention provides a quality inspection method for a thermocouple wire, comprising: step 1, thermocouple wire selection: after the production of the thermocouple wires in the batch is finished, the type of the composite material of the thermocouple wires in the batch is obtained, each test thermocouple wire is randomly selected, and each test thermocouple wire is cut off evenly, so that each test section and the serial number of each test thermocouple wire are obtained.
In a specific embodiment, the method for obtaining the composite material type of the thermocouple wires in the batch specifically comprises the following steps: the composite material type of the batch of thermocouple wires is obtained from a local database.
The local database is used for storing the composite material type, the proper gray scale ratio threshold value, the proper gray scale value interval of the appearance of each composite material type, the first-level quantity threshold value, the second-level quantity threshold value, the first-level screening quantity, each experimental magnetic field intensity, the temperature change step value, the experimental reference electrode and the proper temperature interval of each composite material type, the electrical property abnormal coefficient threshold value, the thermoelectromotive force difference value of the thermocouple wire good product under each experimental magnetic field intensity and each experimental temperature, the thermoelectromotive force difference value under no experimental magnetic field and each experimental temperature, the experimental tension value, the tension experimental duration and the tensile property grade corresponding to each tensile property coefficient interval.
In a specific embodiment, the method for obtaining each test section and the number thereof of each test thermocouple wire comprises the following steps: when each test thermocouple wire is cut off averagely, each cut off section gives a number to the test section, the numbers are arranged from small to large, if the first section is cut off, the number is 1, the number is 2 when the second section is cut off, and the like, and the number of the test sections of each test thermocouple wire is consistent.
According to the invention, step 1. Thermocouple wires are selected, and the subsequent quality detection is facilitated by obtaining each test section of each test thermocouple wire.
Step 2, appearance detection: obtaining appearance images of all test sections of all the test thermocouple wires, screening all the normal-appearance test thermocouple wires and all the abnormal-appearance test sections of all the abnormal-appearance test thermocouple wires, judging whether the appearances of the thermocouple wires in the batch are defective, analyzing the test sections corresponding to all the concerned numbers of the thermocouple wires in the batch if the appearances of the thermocouple wires in the batch are defective, and sending the test sections to a quality responsible person.
In a specific embodiment, the method for obtaining the appearance image of each test section to which each test thermocouple wire belongs specifically includes: the appearance images of the test sections of the test thermocouple wires can be obtained by surrounding the cameras to shoot the test sections of the test thermocouple wires and the existing image splicing technology.
In a specific embodiment of the present invention, the screening method for each appearance normal test thermocouple wire and each appearance abnormal test section of each appearance abnormal test thermocouple wire is as follows: and obtaining a proper gray scale threshold value and proper gray scale value intervals of the appearance of each composite material type from a local database, and mapping to obtain the proper gray scale value intervals of the appearance of the thermocouple wires of the batch according to the composite material types of the thermocouple wires of the batch.
According to the appearance images of the test sections of the test thermocouple wires, extracting the pixel points of the appearance images of the test sections of the test thermocouple wires, and obtaining the gray values of the pixel points of the appearance images of the test sections of the test thermocouple wires through gray processing.
Comparing the gray value of each pixel point of the appearance image of each test section of each test thermocouple wire with the proper gray value interval of the appearance of the thermocouple wires in the batch to obtain each pixel point in the proper gray value interval in the appearance image of each test section of each test thermocouple wire, and marking the pixel point as each proper pixel point of the appearance image of each test section of each test thermocouple wire.
Calculating the proper gray scale ratio of the appearance image of each test section of each test thermocouple wire, comparing the gray scale ratio with a proper gray scale ratio threshold, marking the test thermocouple wire as an abnormal appearance test thermocouple wire if the proper gray scale ratio of the appearance image of a test section of a certain test thermocouple wire is smaller than the proper gray scale ratio threshold, marking the test section as an abnormal appearance test section, and marking the test thermocouple wire as an normal appearance test thermocouple wire if the proper gray scale ratio of the appearance image of each test section of a certain test thermocouple wire is larger than or equal to the proper gray scale ratio threshold, thereby screening the normal appearance test thermocouple wires and the abnormal appearance test sections of the abnormal appearance test thermocouple wires.
In a specific embodiment, the calculating method of the suitable gray scale ratio of the appearance image of each test section of each test thermocouple wire comprises the following steps: counting the number of the suitable pixels of the appearance images of the test sections to which the test thermocouple wires belong, counting the number of the pixels of the appearance images of the test sections to which the test thermocouple wires belong, and dividing the number of the suitable pixels of the appearance images of the test sections to which the test thermocouple wires belong by the number of the pixels so as to obtain the suitable gray scale ratio of the appearance images of the test sections to which the test thermocouple wires belong.
In a specific embodiment of the present invention, the method for determining whether the appearance of the thermocouple wires in the batch is defective includes: a primary number threshold and a secondary number threshold are obtained from a local database.
Counting the number of the appearance abnormal test thermocouple wires according to the appearance abnormal test thermocouple wires, comparing the number of the appearance abnormal test thermocouple wires with a first-level number threshold, and judging that the appearance of the batch of thermocouple wires is defective if the number of the appearance abnormal test thermocouple wires is larger than the first-level number threshold.
According to each test section and the number of each test section of each test thermocouple wire, the number of each appearance abnormality test section of each appearance abnormality test thermocouple wire is extracted, the appearance abnormality test sections of each appearance abnormality test thermocouple wire corresponding to each number are mapped, the number of appearance abnormality test thermocouple wires of each number is counted, the number of the appearance abnormality test thermocouple wires is compared with a two-level number threshold, and if the number of the appearance abnormality test thermocouple wires of a certain number is larger than the two-level number threshold, the appearance defect of the thermocouple wires of the batch is judged.
And 2, appearance detection is carried out, whether the thermocouple wires in the batch have appearance defects is analyzed, the thermocouple wires in the batch are prevented from being used on related products, the quality of the thermocouple wires is ensured, and meanwhile, the quality of the thermocouple wires is ensured, and the quality responsible persons can conveniently carry out subsequent appearance optimization and adjustment by analyzing the main concentrated appearance defects in the test sections.
In a specific embodiment, the specific analysis method for analyzing the test section corresponding to each attention number of the thermocouple wires in the batch is as follows: if the number of the appearance abnormal test thermocouple wires is larger than the first-level number threshold, obtaining first-level screening numbers from a local database, sorting the numbers according to the number of the appearance abnormal test thermocouple wires from large to small, so as to obtain sorted numbers, sequentially screening the sorted numbers of the first-level screening numbers, marking the sorted numbers as attention numbers, and thus obtaining test sections corresponding to the attention numbers of the thermocouple wires in the batch.
If the number of the appearance abnormality test thermocouple wires of a certain number is larger than a two-level number threshold, the number is marked as a concerned number, so that each concerned number is screened, and a test section corresponding to each concerned number of the thermocouple wires of the batch is obtained.
It should be noted that, the first-level screening number is preset by the quality responsible person, if the quality responsible person sets the first-level screening number to be 5, and the first ten numbers after sorting at this time are 5, 7, 23, 13, 10, 18, 6, 28, 33, 21, then according to the first-level screening number, the first five numbers after sorting are selected: 5. 7, 23, 13, 10, and these five numbers are labeled as respective attention numbers.
Step 3, detecting the electrical property quality: and (3) testing the electric performance and magnetic field interference of each testing section of each appearance normal testing thermocouple wire, judging whether the electric performance of the thermocouple wires in the batch is abnormal, if so, analyzing the testing section corresponding to each electric performance attention number of the thermocouple wires in the batch, and sending the testing section to a quality responsible person, otherwise, carrying out tensile testing on each testing section of each appearance normal testing thermocouple wire.
In one embodiment, the specific analysis method for analyzing the test section corresponding to each electrical performance attention number of the thermocouple wires in the present batch is as follows: according to the method for analyzing the test sections corresponding to the attention numbers of the thermocouple wires in the batch, the test sections corresponding to the attention numbers of the electric performance of the thermocouple wires in the batch can be obtained.
In a specific embodiment of the invention, the electrical performance and magnetic field interference test is performed by the following specific method: and obtaining experimental reference electrodes and proper temperature intervals of each experimental magnetic field intensity, temperature change step values and each synthetic material type from a local database, mapping to obtain the experimental reference electrodes and proper temperature intervals of the thermocouple wires of the batch according to the synthetic material types of the thermocouple wires of the batch, and obtaining each experimental temperature of the thermocouple wires of the batch according to the temperature change step values.
If the suitable temperature interval of the thermocouple wires in the batch is-50 ℃ to 1600 ℃ and the temperature change step value is 50 ℃, the experimental temperatures of the thermocouple wires in the batch are-50 ℃,0 ℃, 50 ℃, and 1600 ℃.
And measuring the thermoelectromotive force difference value of each test section of each normal-appearance test thermocouple wire and the experimental reference electrode under each experimental magnetic field intensity and each experimental temperature, thereby obtaining the thermoelectromotive force difference value of each test section of each normal-appearance test thermocouple wire under each experimental magnetic field intensity and each experimental temperature, and obtaining the thermoelectromotive force difference value of each test section of each normal-appearance test thermocouple wire under the conditions without experimental magnetic field and each experimental temperature.
The thermoelectric potential difference values of each test section of each thermocouple wire with normal appearance and each experimental reference electrode under each experimental magnetic field intensity and each experimental temperature can be measured by a microvolter.
In a specific embodiment of the present invention, the specific method for determining whether the electrical performance of the thermocouple wires in the batch is abnormal includes: calculating the anti-magnetic field strength deviation coefficient of each test section of each appearance normal test thermocouple wireWherein x is the number of each appearance normal test thermocouple wire,Y is a positive integer greater than 2, n is the number of each test segment,M is a positive integer greater than 2.
Calculating thermoelectric potential energy deviation coefficients of all test sections of all appearance normal test thermocouple wires。
Calculating the electrical property abnormal coefficient of each test section of each appearance normal test thermocouple wireWhere e is a natural constant.
And acquiring an electrical performance abnormal coefficient threshold value from a local database, comparing the electrical performance abnormal coefficient of each test section of each appearance normal test thermocouple wire with the electrical performance abnormal coefficient threshold value, if the electrical performance abnormal coefficient of a certain test section of a certain appearance normal test thermocouple wire is larger than the electrical performance abnormal coefficient threshold value, marking the appearance normal test thermocouple wire as an electrical performance abnormal thermocouple wire, marking the test section as an electrical performance abnormal test section, and screening each electrical performance abnormal test section of each electrical performance abnormal thermocouple wire.
And judging whether the thermocouple wires in the batch have abnormal electrical properties according to a method for judging whether the appearance of the thermocouple wires in the batch has defects.
In a specific embodiment of the present invention, the coefficient of deviation of the anti-magnetic field strength of each test section of each appearance normal test thermocouple wire is calculated: obtaining the thermoelectromotive force difference value of the thermocouple wire good product under each experimental magnetic field intensity and each experimental temperature from a local databaseAnd differences in thermoelectromotive force in the absence of experimental magnetic fields and at various experimental temperaturesWherein i is the number of each experimental magnetic field intensity,J is a positive integer greater than 2, r is the number of each experimental temperature,S is a positive integer greater than 2.
According to the thermal electromotive force difference value of each test section of each thermocouple wire for normal test of each appearance under each experimental magnetic field intensity and each experimental temperatureAnd according to the thermal electromotive force difference value of each test section of each thermocouple wire material which is normally tested in each appearance under the conditions of no experimental magnetic field and each experimental temperatureCalculating the deviation coefficient of the anti-magnetic field intensity of each test section of each thermocouple wire for normal appearance test。
In a specific embodiment of the present invention, the thermoelectric energy deviation coefficient of each thermocouple wire for normal appearance test is calculated by the specific calculation method: according to the thermal electromotive force difference value of each test section of each thermocouple wire for normal test of each appearance under no experimental magnetic field and each experimental temperatureAnd according to the thermoelectric potential difference value of the good thermocouple wire under the conditions of no experimental magnetic field and all experimental temperaturesCalculating the thermoelectric potential energy deviation coefficient of each thermocouple wire for normal appearance testWhere s is the number of experimental temperatures.
And 3. The electric performance quality detection is carried out by simulating the magnetic field intensity and the temperature variation possibly occurring in the practical application, analyzing whether the thermocouple wires in the batch have electric performance defects, preventing the thermocouple wires in the batch from having the electric performance defects and being used on related products, ensuring the quality of the thermocouple wires, and simultaneously, facilitating a quality responsible person to carry out electric performance optimization on the test sections by analyzing the test sections mainly concentrated in the electric performance defects.
Step 4, tensile property test: after each testing section of each appearance normal testing thermocouple wire is subjected to tensile testing, each testing section of each appearance normal testing thermocouple wire is subjected to electric performance and magnetic field interference testing again, and the tensile performance grade of the thermocouple wires in the batch is evaluated.
In a specific embodiment of the present invention, the tensile test is performed on each test section of the thermocouple wire for testing the normal appearance, and the specific method comprises: and obtaining experimental tension values and tension experimental time from a local database, applying a force of the experimental tension values to the extending direction at the two ends of each test section of each appearance normal test thermocouple wire by using a mechanical arm, and releasing each test section of each appearance normal test thermocouple wire after the tensile experimental time.
In a specific embodiment of the present invention, the tensile property grade of the thermocouple wires of the present batch is evaluated by the following specific evaluation method: after each test section of each appearance normal test thermocouple wire is subjected to electric performance and magnetic field interference test again, according to a method for judging whether electric performance abnormality occurs in the thermocouple wires of the batch, each electric performance abnormality test section of each electric performance abnormality thermocouple wire subjected to electric performance and magnetic field interference test for the second time is screened, the number A of electric performance abnormality thermocouple wires subjected to electric performance and magnetic field interference test for the first time is counted, the number B of electric performance abnormality thermocouple wires subjected to electric performance and magnetic field interference test for the second time is counted, and the tensile performance coefficient of the thermocouple wires of the batch is calculated。
And obtaining the tensile property grade corresponding to each tensile property coefficient interval from the local database, thereby mapping and obtaining the tensile property grade of the thermocouple wires in the batch.
Step 5, thermocouple wire processing: the required tensile property grade of each customer is obtained, and the tensile property grade of the thermocouple wires of the batch and the required tensile property grade of each customer are sent to a quality responsible person.
Step 4 of the invention, the tensile property test and step 5 of the invention, thermocouple wire processing, through evaluating the tensile property grade of the thermocouple wires of this batch, the quality responsible person can distribute the thermocouple wires of this batch to the corresponding customers according to the demands of different customers conveniently.
The foregoing is merely illustrative and explanatory of the principles of this invention, as various modifications and additions may be made to the specific embodiments described, or similar arrangements may be substituted by those skilled in the art, without departing from the principles of this invention or beyond the scope of this invention as defined in the claims.
Claims (5)
1. A quality inspection method for thermocouple wires, comprising:
Step 1, thermocouple wire selection: after the production of the thermocouple wires of the batch is finished, the synthetic material type of the thermocouple wires of the batch is obtained, each test thermocouple wire is randomly selected, and each test thermocouple wire is cut off evenly, so that each test section and each serial number of each test thermocouple wire are obtained;
Step 2, appearance detection: obtaining appearance images of all test sections to which all the test thermocouple wires belong, screening all the normal-appearance test thermocouple wires and all the abnormal-appearance test sections of all the abnormal-appearance test thermocouple wires, judging whether the appearances of the thermocouple wires in the batch are defective, analyzing the test sections corresponding to all the concerned numbers of the thermocouple wires in the batch if the appearances of the thermocouple wires in the batch are defective, and sending the test sections to a quality responsible person;
Step 3, detecting the electrical property quality: carrying out electric performance and magnetic field interference tests on all test sections of the thermocouple wires with normal appearance, judging whether the electric performance of the thermocouple wires in the batch is abnormal, if so, analyzing all test sections corresponding to the electric performance attention numbers of the thermocouple wires in the batch, and sending the test sections to a quality responsible person, otherwise, carrying out tensile tests on all test sections of the thermocouple wires with normal appearance;
the specific method for testing the electric performance and the magnetic field interference comprises the following steps:
Obtaining experimental reference electrodes and proper temperature intervals of each experimental magnetic field intensity, temperature change step values and each synthetic material type from a local database, mapping to obtain the experimental reference electrodes and proper temperature intervals of the thermocouple wires of the batch according to the synthetic material types of the thermocouple wires of the batch, and obtaining each experimental temperature of the thermocouple wires of the batch according to the temperature change step values;
measuring the thermoelectromotive force difference values of each test section of each appearance normal test thermocouple wire and the experimental reference electrode under each experimental magnetic field intensity and each experimental temperature, thereby obtaining the thermoelectromotive force difference values of each test section of each appearance normal test thermocouple wire under each experimental magnetic field intensity and each experimental temperature, and obtaining the thermoelectromotive force difference values of each test section of each appearance normal test thermocouple wire under the conditions without experimental magnetic field and each experimental temperature;
the specific judging method for judging whether the thermocouple wires in the batch have abnormal electrical properties comprises the following steps:
calculating the anti-magnetic field strength deviation coefficient of each test section of each appearance normal test thermocouple wire Wherein x is the number of each appearance normal test thermocouple wire,Y is a positive integer greater than 2, n is the number of each test segment,M is a positive integer greater than 2;
calculating thermoelectric potential energy deviation coefficients of all test sections of all appearance normal test thermocouple wires ；
Calculating the electrical property abnormal coefficient of each test section of each appearance normal test thermocouple wireWherein e is a natural constant;
Acquiring an electrical performance abnormal coefficient threshold value from a local database, comparing the electrical performance abnormal coefficient of each test section of each appearance normal test thermocouple wire with the electrical performance abnormal coefficient threshold value, if the electrical performance abnormal coefficient of a certain test section of a certain appearance normal test thermocouple wire is larger than the electrical performance abnormal coefficient threshold value, marking the appearance normal test thermocouple wire as an electrical performance abnormal thermocouple wire, marking the test section as an electrical performance abnormal test section, and screening each electrical performance abnormal test section of each electrical performance abnormal thermocouple wire;
Judging whether the thermocouple wires in the batch have abnormal electrical properties according to a method for judging whether the appearance of the thermocouple wires in the batch has defects;
the method for calculating the anti-magnetic field strength deviation coefficient of each test section of each appearance normal test thermocouple wire comprises the following steps:
obtaining the thermoelectromotive force difference value of the thermocouple wire good product under each experimental magnetic field intensity and each experimental temperature from a local database And differences in thermoelectromotive force in the absence of experimental magnetic fields and at various experimental temperaturesWherein i is the number of each experimental magnetic field intensity,J is a positive integer greater than 2, r is the number of each experimental temperature,S is a positive integer greater than 2;
According to the thermal electromotive force difference value of each test section of each thermocouple wire for normal test of each appearance under each experimental magnetic field intensity and each experimental temperature And according to the thermal electromotive force difference value of each test section of each thermocouple wire material which is normally tested in each appearance under the conditions of no experimental magnetic field and each experimental temperatureCalculating the deviation coefficient of the anti-magnetic field intensity of each test section of each thermocouple wire for normal appearance test；
The thermoelectric energy deviation coefficient of each thermocouple wire for normal appearance test is calculated by the specific calculation method:
According to the thermal electromotive force difference value of each test section of each thermocouple wire for normal test of each appearance under no experimental magnetic field and each experimental temperature And according to the thermoelectric potential difference value of the good thermocouple wire under the conditions of no experimental magnetic field and all experimental temperaturesCalculating the thermoelectric potential energy deviation coefficient of each thermocouple wire for normal appearance testWherein s is the number of experimental temperatures;
step 4, tensile property test: after each testing section of each appearance normal testing thermocouple wire is subjected to tensile testing, each testing section of each appearance normal testing thermocouple wire is subjected to electric performance and magnetic field interference testing again, and the tensile performance grade of the thermocouple wires in the batch is evaluated;
Step 5, thermocouple wire processing: the required tensile property grade of each customer is obtained, and the tensile property grade of the thermocouple wires of the batch and the required tensile property grade of each customer are sent to a quality responsible person.
2. The quality inspection method for thermocouple wires according to claim 1, wherein the screening of each appearance normal test thermocouple wire and each appearance abnormal test section of each appearance abnormal test thermocouple wire comprises the following specific screening methods:
Obtaining a proper gray scale threshold value and proper gray scale value intervals of the appearance of each composite material type from a local database, and mapping to obtain the proper gray scale value intervals of the appearance of the thermocouple wires of the batch according to the composite material types of the thermocouple wires of the batch;
Extracting each pixel point of the appearance image of each test section of each test thermocouple wire according to the appearance image of each test section of each test thermocouple wire, and obtaining the gray value of each pixel point of the appearance image of each test section of each test thermocouple wire through gray processing;
Comparing the gray value of each pixel point of the appearance image of each test section of each test thermocouple wire with the proper gray value interval of the appearance of the thermocouple wires in the batch to obtain each pixel point in the proper gray value interval in the appearance image of each test section of each test thermocouple wire, and marking the pixel point as each proper pixel point of the appearance image of each test section of each test thermocouple wire;
calculating the proper gray scale ratio of the appearance image of each test section of each test thermocouple wire, comparing the gray scale ratio with a proper gray scale ratio threshold, marking the test thermocouple wire as an abnormal appearance test thermocouple wire if the proper gray scale ratio of the appearance image of a test section of a certain test thermocouple wire is smaller than the proper gray scale ratio threshold, marking the test section as an abnormal appearance test section, and marking the test thermocouple wire as an normal appearance test thermocouple wire if the proper gray scale ratio of the appearance image of each test section of a certain test thermocouple wire is larger than or equal to the proper gray scale ratio threshold, thereby screening the normal appearance test thermocouple wires and the abnormal appearance test sections of the abnormal appearance test thermocouple wires.
3. The method for detecting the quality of thermocouple wires according to claim 1, wherein the determining whether the appearance of the batch of thermocouple wires is defective is specifically performed by:
Acquiring a primary number threshold value and a secondary number threshold value from a local database;
Counting the number of the appearance abnormal test thermocouple wires according to each appearance abnormal test thermocouple wire, comparing the number of the appearance abnormal test thermocouple wires with a first-level number threshold, and judging that the appearance of the batch of thermocouple wires has defects if the number of the appearance abnormal test thermocouple wires is larger than the first-level number threshold;
According to each test section and the number of each test section of each test thermocouple wire, the number of each appearance abnormality test section of each appearance abnormality test thermocouple wire is extracted, the appearance abnormality test sections of each appearance abnormality test thermocouple wire corresponding to each number are mapped, the number of appearance abnormality test thermocouple wires of each number is counted, the number of the appearance abnormality test thermocouple wires is compared with a two-level number threshold, and if the number of the appearance abnormality test thermocouple wires of a certain number is larger than the two-level number threshold, the appearance defect of the thermocouple wires of the batch is judged.
4. The quality inspection method for thermocouple wires according to claim 1, wherein the tensile test is performed on each test section of the thermocouple wires with normal appearance, and the specific method is as follows:
And obtaining experimental tension values and tension experimental time from a local database, applying a force of the experimental tension values to the extending direction at the two ends of each test section of each appearance normal test thermocouple wire by using a mechanical arm, and releasing each test section of each appearance normal test thermocouple wire after the tensile experimental time.
5. The quality inspection method for thermocouple wires according to claim 1, wherein the tensile property level of the batch of thermocouple wires is evaluated by the following specific evaluation method:
After each test section of each appearance normal test thermocouple wire is subjected to electric performance and magnetic field interference test again, according to a method for judging whether electric performance abnormality occurs in the thermocouple wires of the batch, each electric performance abnormality test section of each electric performance abnormality thermocouple wire subjected to electric performance and magnetic field interference test for the second time is screened, the number A of electric performance abnormality thermocouple wires subjected to electric performance and magnetic field interference test for the first time is counted, the number B of electric performance abnormality thermocouple wires subjected to electric performance and magnetic field interference test for the second time is counted, and the tensile performance coefficient of the thermocouple wires of the batch is calculated ；
And obtaining the tensile property grade corresponding to each tensile property coefficient interval from the local database, thereby mapping and obtaining the tensile property grade of the thermocouple wires in the batch.
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