CN114749495B - On-line detection and coupling correction control method for slab temperature field - Google Patents
On-line detection and coupling correction control method for slab temperature field Download PDFInfo
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- CN114749495B CN114749495B CN202210271917.XA CN202210271917A CN114749495B CN 114749495 B CN114749495 B CN 114749495B CN 202210271917 A CN202210271917 A CN 202210271917A CN 114749495 B CN114749495 B CN 114749495B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000012937 correction Methods 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 230000008878 coupling Effects 0.000 title claims abstract description 14
- 238000010168 coupling process Methods 0.000 title claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 14
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 31
- 239000000428 dust Substances 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000003595 mist Substances 0.000 claims abstract description 6
- 239000013598 vector Substances 0.000 claims description 21
- 230000003068 static effect Effects 0.000 claims description 11
- 230000005855 radiation Effects 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000004861 thermometry Methods 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims 1
- 238000010926 purge Methods 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 5
- 239000004566 building material Substances 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 239000003208 petroleum Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 238000000691 measurement method Methods 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000010801 machine learning Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Radiation Pyrometers (AREA)
Abstract
The application discloses a slab temperature field online detection and coupling correction control method, which is applied to industries such as metallurgy, petroleum processing, chemical industry, building materials, food processing and the like, wherein the implementation of the method comprises the following steps: a temperature measurement algorithm of the single-point colorimetric thermometer and the area array CCD temperature measurement system is fused to eliminate the influence of on-site dust and water mist on temperature measurement; and positioning the single-point temperature measuring position in the CCD measuring region to determine the CCD measuring gray value at the single-point temperature measuring position. The application provides an algorithm integrating a single-point colorimetric thermometer and an area array CCD temperature measuring system, which can eliminate the influence of on-site dust and water mist on temperature measurement and improve the measurement accuracy of a temperature field. A positioning algorithm is provided, a CCD measurement gray value at a temperature measuring position of a single-point temperature measuring instrument is determined, and temperature on-line correction is realized.
Description
Technical Field
The application relates to a slab temperature field online detection and coupling correction control method, which is applied to industries such as metallurgy, petroleum processing, chemical industry, building materials, food processing and the like, in particular to an online temperature detection and coupling correction algorithm for a hot rolled slab band.
Background
In the main process of hot continuous rolling, the temperature of the plate and the strip ranges from 450 ℃ to 1300 ℃ and is higher than the high-temperature oxidation temperature of the metal material, so that the surfaces of the plate and the strip are randomly distributed with iron scales with different thicknesses and different forms; and because of inconsistent emissivity of different steel grades and interference of severe environments such as water vapor, dust and the like in a production field, the online accurate measurement of the temperature field of the surface of the slab is still a difficult problem in the field of metallurgical detection.
The measurement methods of the temperature field are mainly divided into three categories: direct measurement method, soft measurement based on heat transfer model and temperature prediction model established based on machine learning theory. The direct measurement method can be further divided into a contact measurement method and a non-contact measurement method.
The contact type measurement is difficult to implement on site because the sensor and the mechanical device are worn greatly, so that the contact type measurement is not suitable for long-term online use. The current common temperature field measurement method generally adopts single-point infrared radiation temperature measurement as a main part, and mainly comprises two main types of monochromatic radiation temperature measurement and colorimetric radiation temperature measurement.
In recent years, the development of slab far-surface temperature measurement systems based on linear arrays and area array CCD sensors also becomes a research hot spot, however, compared with the traditional single-point radiation temperature measurement, the method is only updated from single-point temperature measurement to surface temperature information acquisition, the interference of scale fluctuation, water mist, dust and other influences are not effectively solved, and the measurement accuracy is not substantially changed.
In order to solve the problems, a control method for on-line detection and coupling correction of a slab temperature field needs to be developed, and accurate on-line measurement and multi-information coupling correction of the slab temperature field are realized.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the application provides an online detection and coupling correction control method for slab temperature fields, which realizes high-precision online detection of slab temperature fields. The device has the advantages of simple structure, stable operation, safety and reliability.
In order to achieve the above purpose, the application provides a control method for on-line detection and coupling correction of a slab temperature field, comprising the following steps:
a temperature measurement algorithm of the single-point colorimetric thermometer and the area array CCD temperature measurement system is fused to eliminate the influence of on-site dust and water mist on temperature measurement;
and positioning the single-point temperature measuring position in the CCD measuring region to determine the CCD measuring gray value at the single-point temperature measuring position.
In some alternative embodiments, the temperature measurement algorithm of the fused single-point colorimetric temperature measurement instrument and area array CCD temperature measurement system comprises:
and (3) taking the attenuation of field dust and water vapor to the energy of the jurisdiction into consideration, obtaining the output gray level of the pixels, and obtaining the corrected temperature according to the principle that the gray values of the field dust and the water vapor are equal before and after correction.
In some alternative embodiments, the method comprisesObtaining corrected temperature T c ，C 2 For a second radiation constant, T m Lambda is the brightness temperature measured for CCD 0 For the center wavelength of the input band,k is a constant, i.e. the instrument constant, alpha is the equivalent emissivity, T r The temperature obtained by the colorimetric thermometer is alpha=beta.epsilon, beta is the attenuation coefficient of water vapor dust, and epsilon is the emissivity of the steel plate.
In some alternative embodiments, the locating the single point thermometry locations in the CCD measurement region includes:
dividing a slab thermal image acquired by a CCD (charge coupled device) from a background, dividing grids, solving the average temperature in each grid, carrying out the same treatment on the thermal image in a plurality of seconds, and forming a first vector for each grid;
within the same few seconds, the temperature data obtained by the single-point colorimetric thermometer are formed into a second vector;
similarity between the first vector and the second vector is compared for positioning.
In some alternative embodiments, the method comprises A first vector is obtained, M and N representing the number of rows and columns of the divided grid, respectively, the temperature average value obtained for the nth second of the ith row and jth column grids is T, and the temperature average value in the nth second of the grids is T.
In some alternative embodiments, the method comprisesObtain a second vector, P (n) For single point temperature measurement data within the nth second, +.>P is the average value of single point temperature measurement data in n seconds.
In some alternative embodiments, the method comprisesA similarity between the first vector and the second vector is obtained.
In some alternative embodiments, if the spot positions of the single point colorimetric thermometer are exactly half of the two grids or one fourth of the four grids, multiple positions with the same similarity will appear, and then the positions need to be re-gridded for repositioning in a small area.
In some alternative embodiments, a dust-proof static pressure pipe is arranged at the front end of the single-point colorimetric thermometer, so that the dust-proof purpose is achieved by blowing a certain amount of pure and dry air.
In general, the above technical solutions conceived by the present application, compared with the prior art, enable the following beneficial effects to be obtained:
1) An algorithm integrating the single-point colorimetric thermometer and the area array CCD temperature measuring system is provided, the influence of on-site dust and water mist on temperature measurement is eliminated, and the measurement accuracy of a temperature field is improved.
2) A positioning algorithm is provided, a CCD measurement gray value at a temperature measuring position of a single-point temperature measuring instrument is determined, and temperature on-line correction is realized.
3) The dustproof static pressure pipe is designed, and the dustproof purpose can be achieved by blowing and sweeping a certain amount of pure and dry air, and the on-site practical application proves that the lens at the front end of the single-point colorimetric thermometer is generally scrubbed for about half a year. Simple structure, safety and practicality.
Drawings
FIG. 1 is a schematic diagram of a slab temperature field on-line detection and coupling correction control method provided by an embodiment of the application;
FIG. 2 is a schematic view of a dust-proof static pressure tube of an on-line temperature detecting device according to an embodiment of the present application;
wherein, 1-a conveying roller way; 2-plate blank; 3-an optical filter; 4-narrow-band area array CCD thermometer; 5-a temperature detection and coupling correction processor; 6-a single point colorimetric thermometer; 7-a dustproof static pressure pipe; 8-a water outlet; 9-dust airflow; 10-single point colorimetric thermometer light; 11-a dustproof static pressure pipe chamber; 12-an optical filter; 13-a slab single-point colorimetric thermometer; 14-hydrostatic holes; 15-static pressure joint; 16-full pressure joint; 17-exhaust port.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. In addition, the technical features of the embodiments of the present application described below may be combined with each other as long as they do not collide with each other.
In the examples of the present application, "first," "second," etc. are used to distinguish between different objects, and are not used to describe a particular order or sequence.
As shown in FIG. 1, the application provides an online detection and coupling correction control method for a slab temperature field, and provides a fusion algorithm for temperature field detection of a single-point colorimetric thermometer and an area array CCD temperature measurement system, so as to realize online detection of the slab temperature field. Meanwhile, an accurate temperature measuring point positioning algorithm is provided, a CCD (charge coupled device) measurement gray value at the temperature measuring position of the single-point thermometer is determined, and the temperature is corrected online. Wherein 1 is a conveying roller way; 2 is a plate blank; 3 is an optical filter; 4 is a narrow-band area array CCD thermometer; 5 is a temperature detection and coupling correction processor; 6 is a single-point colorimetric thermometer; and 7 is a dustproof static pressure pipe.
1) Further, specific algorithm: considering the attenuation of field dust and water vapor to radiation energy, the pixel output gray scale is calculated as follows:
α＝β·ε
wherein:
alpha is the equivalent emissivity and is the ratio of the light emitted,
beta is the attenuation coefficient of the water vapor dust;
epsilon is the emissivity of the steel plate;
k is a constant, namely an instrument constant;
λ 0 the center wavelength of the input wave band, m;
t is the real temperature of the slab, K;
C 2 is a second radiation constant (1.4388X 10-2 mK).
2) Further, the deduction is that:
wherein:
T r the temperature obtained by the colorimetric thermometer is K.
3) According to the principle that the gray values of the two gray values are equal before and after correction:
wherein:
T c k is the corrected temperature;
T m k is the luminance temperature measured for the CCD.
4) Furthermore, in order to determine the CCD measurement gray value at the temperature measuring position of the single-point thermometer, the single-point position needs to be positioned in the CCD measurement region before the temperature on-line correction is realized, and the application provides a positioning algorithm, which comprises the following steps:
5) Firstly, dividing a slab thermal image acquired by CCD from a background, dividing M multiplied by N grids, and obtaining the average temperature T in each grid ij (CCD measures temperature value), the same processing is performed on the thermal image within n seconds, and a vector C is formed for each grid according to the following formula ij 。
Wherein:
obtaining an obtained temperature average value for the nth second of the ith row and jth column grids;
t is the average temperature over n seconds of the grid.
6) Further, within the same n seconds, the temperature data obtained by the single point colorimetric thermometer is formed into a vector D.
Wherein:
P (n) single point temperature measurement data within the nth second;
p is the average value of single point temperature measurement data in n seconds.
7) Further, the two vectors C are compared ij And D, in this embodiment, a quantitative index S is selected in which the cosine included angle between the two vectors is the similarity ij The closer it takes to 1, the more similar the two vectors are.
8) When the positioning algorithm is used for positioning, if the spot positions of the single-point colorimetric thermometer are exactly half of two grids or quarter of four grids respectively, a plurality of positions with the same similarity can theoretically appear, and at the moment, the positions are required to be re-grid-divided for repositioning in a small area.
9) The front end of the single-point colorimetric thermometer is provided with the dustproof static pressure pipe, the dustproof purpose can be achieved by blowing a certain amount of pure and dry air, and the on-site practical application proves that the lens at the front end of the single-point colorimetric thermometer is generally scrubbed for about half a year, so that the single-point colorimetric thermometer is simple in structure, safe and practical. The design diagram is shown in fig. 2, wherein 8 is a water outlet; 9 is dust air flow; 10 is single-point colorimetric thermometer light; 11 is a dustproof static pressure pipe chamber; 12 is an optical filter; 13 is a slab single-point colorimetric thermometer; 14 is a static pressure hole; 15 is a static pressure joint; 16 is a full pressure joint; and 17 is an exhaust port.
It should be noted that each step/component described in the present application may be split into more steps/components, or two or more steps/components or part of operations of the steps/components may be combined into new steps/components, according to the implementation needs, to achieve the object of the present application.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the application and is not intended to limit the application, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the application are intended to be included within the scope of the application.
Claims (7)
1. The control method for on-line detection and coupling correction of the slab temperature field is characterized by comprising the following steps:
a temperature measurement algorithm of the single-point colorimetric thermometer and the area array CCD temperature measurement system is fused to eliminate the influence of on-site dust and water mist on temperature measurement;
positioning the single-point temperature measurement position in the CCD measurement area to determine a CCD measurement gray value at the single-point temperature measurement position;
the temperature measurement algorithm for fusing the single-point colorimetric thermometer and the area array CCD temperature measurement system comprises the following steps:
the attenuation of field dust and water vapor to radiation energy is considered to obtain pixel output gray scale, and corrected temperature is obtained according to the principle that gray scale values of the field dust and water vapor are equal before and after correction;
from the following componentsObtaining corrected temperature T c ，C 2 For a second radiation constant, T m Lambda is the brightness temperature measured for CCD 0 For the center wavelength of the input band, < > and>k is a constant, i.e. the instrument constant, alpha is the equivalent emissivity, T r The temperature obtained by the colorimetric thermometer is alpha=beta.epsilon, beta is the attenuation coefficient of water vapor dust, and epsilon is the emissivity of the steel plate.
2. The control method according to claim 1, wherein said locating a single point thermometry location in a CCD measurement area comprises:
dividing a slab thermal image acquired by a CCD (charge coupled device) from a background, dividing grids, solving the average temperature in each grid, carrying out the same treatment on the thermal image in a plurality of seconds, and forming a first vector for each grid;
within the same few seconds, the temperature data obtained by the single-point colorimetric thermometer are formed into a second vector;
similarity between the first vector and the second vector is compared for positioning.
3. The control method according to claim 2, characterized by comprising Obtaining a first vector, M and N respectively representing the number of rows and columns of the divided grid, +.>The temperature average value obtained for the nth second of the ith row and jth column grids is T, and the temperature average value in the nth second of the grids is T.
4. A control method according to claim 3, characterized by the fact that it consists ofObtain a second vector, P (n) For single point temperature measurement data within the nth second, +.>P is the average value of single point temperature measurement data in n seconds.
5. The control method according to claim 4, characterized by comprising A similarity between the first vector and the second vector is obtained.
6. The control method according to claim 5, wherein if the spot positions of the single-point colorimetric thermometer are exactly half of two grids or one fourth of four grids, a plurality of positions with the same similarity will appear, and the positions need to be re-gridded for repositioning in a small area.
7. The control method according to claim 1, wherein a dust-proof static pressure tube is installed at the front end of the single-point colorimetric thermometer, so as to achieve the purpose of dust prevention by purging with a certain amount of pure and dry air.
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