Temperature measurement method and device for wire rod, storage medium, and computer equipment

Abstract

The present application discloses a method and device for measuring the temperature of a wire rod, a storage medium, and a computer device. The method includes: acquiring an infrared thermal image of the wire rod to be measured in real time; determining an effective temperature measurement area based on the infrared thermal image and characteristic information of the wire rod to be measured; constructing a wire rod geometric model of the wire rod to be measured, projecting a preset light onto the wire rod geometric model and tracing the light propagation path of the preset light, and calculating an effective emissivity based on the tracing result of the light propagation path; and correcting the temperature measurement value of the effective temperature measurement area based on the effective emissivity to obtain a corrected temperature measurement result. By acquiring an infrared thermal image and analyzing the infrared thermal image using an image processing method, the effective temperature measurement area can be dynamically captured. By calculating and analyzing the effective emissivity between the wire rods, the measured temperature of the wire rod is corrected, thereby improving the accuracy and stability of the wire rod temperature measurement.

Description

Technical Field

[0001] The present application relates to the technical field of high-speed wire rod production, and in particular to a temperature measurement method and device for wire rods, a storage medium, and a computer device. Background Art

[0002] To achieve intelligent temperature control of wire rod, Stelmor controlled cooling is often employed. The Stelmor controlled cooling process layout is as follows: upon exiting the finishing mill, the wire rod immediately enters a water-cooling section consisting of multiple water tanks for forced water cooling. It is then conveyed by pinch rollers to the laying head for coiling and laid out in loose coils on a continuously operating Stelmor conveyor. A fan installed above the conveyor provides air cooling before the wire rod is collected by a collection drum. The water-cooling section controls the temperature of the rolled piece to prevent grain growth and prepare for subsequent phase transformation. The air-cooling section controls the phase transformation of the rolled piece at a specific cooling rate to achieve the desired microstructure. The mechanical properties and microstructure of the wire rod depend primarily on the phase transformation during the air-cooling process, making accurate control of the cooling rate during this phase transformation crucial. However, existing temperature measurement methods are hampered by the harsh production environment, the geometric characteristics of the wire rod itself, the oscillation of the wire rod on the rollers that causes the temperature measurement target to vary, and the effective radiation generated by the overlapping wire rods.

[0003] On the Stelmor air-cooling line, there are currently two main methods for measuring wire rod temperature. One involves modeling and simulating the wire rod cooling process to predict temperature changes; the other involves directly measuring the wire rod temperature using non-contact temperature measurement. Because the model parameters of the first method are set based on wire rod temperatures measured on-site, the accuracy of the model is constrained by the accuracy of the measured temperature. For the second method, most companies currently use fixed spot thermometers for wire rod temperature measurement, with a few using scanning spot thermometers. The mesh structure created by the overlapping wire rods makes accurate temperature measurement difficult. This is because spot thermometers require that the object being measured be larger than the spot size of the thermometer. Since the diameter of a wire rod ranges from approximately 5.5 to 20 mm, reliable temperature measurement is typically performed in an area some distance from the wire rod edge. This area is largely unaffected by the holes created by the overlapping wire rods and serves as the effective temperature measurement area. Fixed spot thermometers have a fixed measurement target, while the wire rods move laterally as they are transported on rollers. This makes it difficult to align the thermometer with the target. Scanning spot thermometers obtain wire rod temperature information by scanning the effective measurement area up and down using peak filtering. While they can capture the target measurement area, the scanning cycle can lead to missed temperature information. Furthermore, scanning spot thermometers cannot address the instability and inaccuracy of temperature measurements caused by effective radiation between wire rods. Summary of the Invention

[0004] In view of this, the present application provides a temperature measurement method and device for wire rods, a storage medium, and a computer device. By acquiring infrared thermal images and using image processing methods to analyze infrared thermal images, dynamic capture of effective temperature measurement areas is achieved. By calculating and analyzing the effective emissivity between wire rods, the measured temperature of the wire rods is corrected, thereby improving the accuracy and stability of wire rod temperature measurement.

[0005] According to one aspect of the present application, a method for measuring the temperature of a wire rod is provided, the method comprising:

[0006] Real-time acquisition of infrared thermal images of the wire rod to be measured;

[0007] Determining an effective temperature measurement area based on the infrared thermal image and characteristic information of the wire rod to be temperature measured;

[0008] Constructing a wire rod geometric model of the wire rod to be temperature-measured, projecting a preset light onto the wire rod geometric model and tracing the light propagation path of the preset light, and calculating the effective emissivity based on the tracing result of the light propagation path;

[0009] Based on the effective emissivity, the temperature measurement value of the effective temperature measurement area is corrected to obtain a corrected temperature measurement result.

[0010] Optionally, projecting a preset light onto the wire rod geometric model and tracing a light propagation path of the preset light, and calculating an effective emissivity based on a tracing result of the light propagation path, includes:

[0011] Constructing a plurality of rays to be traced, and projecting the rays to be traced onto target projection points of the wire rod geometric model, wherein the wire rod geometric model includes the plurality of target projection points;

[0012] In the wire rod geometric model, for any ray to be traced, tracing the ray propagation path of the ray to be traced after being projected, and determining whether the ray to be traced is absorbed by the wire rod geometric model based on the ray propagation path;

[0013] The local effective emissivity of the target projection point is calculated according to the number of absorbed rays to be traced and the total number of rays to be traced. The effective emissivity of the wire rod geometric model is obtained according to the local effective emissivity of multiple target projection points.

[0014] Optionally, before projecting the rays to be traced onto the target projection points of the wire rod geometric model, the method further comprises:

[0015] Determine the projection angle of each ray to be traced and the intrinsic emissivity of the wire rod;

[0016] Accordingly, projecting the rays to be traced onto target projection points of the wire rod geometric model respectively includes:

[0017] For any light ray to be traced, the light ray to be traced is projected onto a target projection point of the wire rod geometric model according to a corresponding projection angle, so that the light ray to be traced is propagated according to the target projection point.

[0018] Optionally, judging whether the light to be traced is absorbed by the wire rod geometric model according to the light propagation path includes:

[0019] When the ray to be traced is projected onto the target projection point of the wire rod geometric model, a random number is generated. If the random number is greater than the intrinsic emissivity of the wire rod to be temperature measured, the ray to be traced is reflected.

[0020] If the random number is smaller than the intrinsic emissivity of the wire rod to be temperature measured, the light to be tracked is absorbed.

[0021] Optionally, the correcting the temperature measurement value of the effective temperature measurement area based on the effective emissivity to obtain a corrected temperature measurement result includes:

[0022] Filtering the temperature measurement values ​​of the effective temperature measurement area to obtain a plurality of peak temperatures after filtering;

[0023] According to the change cycle of the effective emissivity, the peak effective emissivity within multiple change cycles is determined, and based on the difference between the peak effective emissivity and the intrinsic emissivity, the peak temperature interference deviation value is calculated, and the peak temperature is corrected according to the peak temperature interference deviation value to obtain a corrected temperature measurement result.

[0024] Optionally, determining the effective temperature measurement area according to the infrared thermal image and characteristic information of the wire rod to be temperature measured includes:

[0025] Perform spatial transformation on the infrared thermal image according to the shooting angle of the infrared thermal image to obtain the physical position of each pixel in the infrared thermal image;

[0026] The wire rod area is determined according to the physical position and characteristic information of the wire rod to be temperature measured, and the effective temperature measurement area is determined based on the wire rod area and the preset deviation distance.

[0027] Optionally, constructing a wire rod geometric model of the wire rod to be temperature measured includes:

[0028] Obtaining geometric parameters of the wire rod to be temperature-measured, wherein the geometric parameters of the wire rod include spatial coordinate parameters of the wire rod to be temperature-measured along the X-axis, the Y-axis, and the Z-axis in a preset spatial coordinate system;

[0029] Based on the spatial coordinate parameters, a wire rod geometric model of the wire rod to be temperature measured is constructed in a preset spatial coordinate system.

[0030] According to another aspect of the present application, a temperature measuring device for a wire rod is provided, the device comprising:

[0031] Infrared thermal image acquisition module, used to acquire infrared thermal images of the wire rod to be measured in real time;

[0032] An effective measurement area determination module is used to determine an effective temperature measurement area based on the infrared thermal image and characteristic information of the wire rod to be temperature measured;

[0033] an effective emissivity calculation module, configured to construct a wire rod geometric model of the wire rod to be temperature-measured, project a preset light onto the wire rod geometric model, trace the light propagation path of the preset light, and calculate the effective emissivity based on the tracing result of the light propagation path;

[0034] The temperature correction module is used to correct the temperature measurement value of the effective temperature measurement area based on the effective emissivity to obtain a corrected temperature measurement result.

[0035] Optionally, the effective emissivity calculation module is further configured to:

[0036] Constructing a plurality of rays to be traced, and projecting the rays to be traced onto target projection points of the wire rod geometric model, wherein the wire rod geometric model includes the plurality of target projection points;

[0037] In the wire rod geometric model, for any ray to be traced, tracing the ray propagation path of the ray to be traced after being projected, and determining whether the ray to be traced is absorbed by the wire rod geometric model based on the ray propagation path;

[0038] The local effective emissivity of the target projection point is calculated according to the number of absorbed rays to be traced and the total number of rays to be traced. The effective emissivity of the wire rod geometric model is obtained according to the local effective emissivity of multiple target projection points.

[0039] Optionally, the effective emissivity calculation module is further configured to:

[0040] Determine the projection angle of each ray to be traced and the intrinsic emissivity of the wire rod;

[0041] For any light ray to be traced, the light ray to be traced is projected onto a target projection point of the wire rod geometric model according to a corresponding projection angle, so that the light ray to be traced is propagated according to the target projection point.

[0042] Optionally, the effective emissivity calculation module is further configured to:

[0043] When the ray to be traced is projected onto the target projection point of the wire rod geometric model, a random number is generated. If the random number is greater than the intrinsic emissivity of the wire rod to be temperature measured, the ray to be traced is reflected.

[0044] If the random number is smaller than the intrinsic emissivity of the wire rod to be temperature measured, the light to be tracked is absorbed.

[0045] Optionally, the temperature correction module is further configured to:

[0046] Filtering the temperature measurement values ​​of the effective temperature measurement area to obtain a plurality of peak temperatures after filtering;

[0047] According to the change cycle of the effective emissivity, the peak effective emissivity within multiple change cycles is determined, and based on the difference between the peak effective emissivity and the intrinsic emissivity, the peak temperature interference deviation value is calculated, and the peak temperature is corrected according to the peak temperature interference deviation value to obtain a corrected temperature measurement result.

[0048] Optionally, the effective measurement area determination module is further configured to:

[0049] Perform spatial transformation on the infrared thermal image according to the shooting angle of the infrared thermal image to obtain the physical position of each pixel in the infrared thermal image;

[0050] The wire rod area is determined according to the physical position and characteristic information of the wire rod to be temperature measured, and the effective temperature measurement area is determined based on the wire rod area and the preset deviation distance.

[0051] Optionally, the geometric model building module is further used to:

[0052] Obtaining geometric parameters of the wire rod to be temperature-measured, wherein the geometric parameters of the wire rod include spatial coordinate parameters of the wire rod to be temperature-measured along the X-axis, the Y-axis, and the Z-axis in a preset spatial coordinate system;

[0053] Based on the spatial coordinate parameters, a wire rod geometric model of the wire rod to be temperature measured is constructed in a preset spatial coordinate system.

[0054] According to another aspect of the present application, a storage medium is provided, on which a computer program is stored. When the program is executed by a processor, the temperature measurement method for the wire rod is implemented.

[0055] According to another aspect of the present application, a computer device is provided, comprising a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor implements the above-mentioned temperature measurement method for the wire rod when executing the program.

[0056] By means of the above technical solution, the present application provides a method and device for measuring the temperature of a wire rod, a storage medium, and a computer device, which can obtain an infrared thermal image of the wire rod to be measured in real time; determine an effective temperature measurement area based on the infrared thermal image and the characteristic information of the wire rod to be measured; construct a wire rod geometric model of the wire rod to be measured, project a preset light onto the wire rod geometric model and trace the light propagation path of the preset light, and calculate the effective emissivity based on the tracing result of the light propagation path; based on the effective emissivity, correct the temperature measurement value of the effective temperature measurement area to obtain a corrected temperature measurement result. By obtaining an infrared thermal image and analyzing the infrared thermal image using an image processing method, the effective temperature measurement area can be dynamically captured. By calculating and analyzing the effective emissivity between the wire rods, the measured temperature of the wire rod is corrected, thereby improving the accuracy and stability of the wire rod temperature measurement.

[0057] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0059] Figure 1 A schematic flow chart of a method for measuring the temperature of a wire rod provided in an embodiment of the present application is shown;

[0060] Figure 2 A schematic diagram of a temperature measurement system provided in an embodiment of the present application is shown;

[0061] Figure 3 A schematic diagram of a wire rod provided in an embodiment of the present application is shown;

[0062] Figure 4 A schematic flow chart of another method for measuring the temperature of a wire rod provided in an embodiment of the present application is shown;

[0063] Figure 5 A wire rod geometric model provided in an embodiment of the present application is shown;

[0064] Figure 6 A schematic flow chart of another method for measuring the temperature of a wire rod provided in an embodiment of the present application is shown;

[0065] Figure 7 A schematic structural diagram of a temperature measuring device for a wire rod provided in an embodiment of the present application is shown;

[0066] Figure 8 A schematic structural diagram of another temperature measuring device for wire rods provided in an embodiment of the present application is shown.

[0067] Among them, 21 is a thermal imager, 22 is a field of view angle, 23 is a support frame, 24 is a first baffle, 25 is a roller, 26 is a wire rod, and 27 is a second baffle. DETAILED DESCRIPTION

[0068] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0069] In this embodiment, a method for measuring the temperature of a wire rod is provided. Figure 1 As shown, the method includes:

[0070] Step 101: Acquire an infrared thermal image of the wire rod to be temperature measured in real time.

[0071] Stelmor Controlled Cooling is an intelligent temperature control method that eliminates or reduces post-heat treatments in downstream processes such as quenching, annealing and quenching / tempering, thereby saving energy and the environment, improving the price competitiveness of the rolling mill and making it possible to produce a variety of products with only one cooling line by using roller conveyors, cooling fans under the conveyor and an insulating cover above the conveyor.

[0072] In an embodiment of the present application, it is used to measure the temperature of the wire rod during the air cooling process of the Stelmor controlled cooling process. Specifically, the infrared thermal image of the wire rod to be measured can be obtained in real time. The temperature of the wire rod can be measured by building a temperature measurement system, and the infrared thermal image of the entire wire rod can be obtained by the thermal imager in the temperature measurement system, thereby ensuring the integrity of the temperature measurement information. Regarding the installation requirements of the thermal imager: it needs to be able to cover the position of the entire wire rod. At the same time, the spatial resolution of the thermal imager must be less than 1 / 3 of the wire rod to be measured to ensure the temperature measurement accuracy, and the angle between the temperature measurement direction of all temperature measurement points and the normal direction of the wire rod surface is less than 45°. In addition, the thermal imager needs to be calibrated before it can be used correctly. Temperature measurement system such as Figure 2 As shown, the wire rod Figure 3 shown.

[0073] Step 102: determining an effective temperature measurement area based on the infrared thermal image and characteristic information of the wire rod to be temperature measured.

[0074] Next, the effective temperature measurement area is determined based on the infrared thermal image and the characteristic information of the wire rod to be measured. Since the effective temperature measurement area moves in the roller conveyor direction and the lateral direction perpendicular to the roller during the actual production process of the wire rod, neither fixed spot thermometers nor scanning spot thermometers can fully capture the temperature information of the effective temperature measurement area in real time. By determining the target area based on the temperature characteristics of the wire rod and the differences in the surrounding environment, and then extracting the temperature measurement area based on the target area, the effective temperature measurement area of ​​the wire rod can be dynamically captured during its movement, thereby improving the accuracy of temperature measurement.

[0075] Step 103 : constructing a wire rod geometric model of the wire rod to be temperature measured, projecting a preset light onto the wire rod geometric model and tracing the light propagation path of the preset light, and calculating the effective emissivity based on the tracing result of the light propagation path.

[0076] Next, a geometric model of the wire rod to be measured is constructed. For example, the geometric model of the object to be measured (the wire rod to be measured) can be established based on its geometric shape, material optical properties, surface properties, and cavity isothermal conditions. Due to the difficulty in experimentally determining the effective emissivity, a model calculation method is typically used, such as the Monte Carlo method (MCM). The Monte Carlo method can calculate the effective emissivity of any point on the inner surface of the cavity based on the cavity geometric model. To this end, a predetermined light ray is projected onto the wire rod geometric model and the light propagation path of the predetermined light ray is traced. The effective emissivity is then calculated based on the tracing results of the light propagation path.

[0077] Step 104 : Correcting the temperature measurement value of the effective temperature measurement area based on the effective emissivity to obtain a corrected temperature measurement result.

[0078] Next, the temperature measurement values ​​in the effective temperature measurement area are corrected based on the effective emissivity to obtain the corrected temperature measurement results. Due to the actual overlap of the wire rods, the energy at a certain point in the wire rod comes not only from the energy emitted by the wire rod itself, but also from energy reflected by other wire rods. This is affected by effective radiation. However, the intrinsic emissivity of the wire rod set by the thermal imager during actual temperature measurement only considers the energy emitted by the wire rod itself, resulting in inaccurate temperature measurements. By establishing a calculation model for the effective emissivity to process the temperature measurement results of the thermal imager, the stability and accuracy of the temperature measurement are improved.

[0079] By applying the technical solution of this embodiment, an infrared thermal image of the wire rod to be measured is acquired in real time. Based on the infrared thermal image and the characteristic information of the wire rod to be measured, an effective temperature measurement area is determined. A geometric model of the wire rod to be measured is constructed, a preset light is projected onto the wire rod geometric model, and the light propagation path of the preset light is traced. Based on the traced light propagation path, the effective emissivity is calculated. Based on the effective emissivity, the temperature measurement value of the effective temperature measurement area is corrected to obtain a corrected temperature measurement result. By acquiring an infrared thermal image and analyzing the infrared thermal image using image processing methods, the effective temperature measurement area is dynamically captured. By calculating and analyzing the effective emissivity between the wire rods, the measured temperature of the wire rod is corrected, thereby improving the accuracy and stability of temperature measurement.

[0080] Furthermore, as a refinement and expansion of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, another temperature measurement method for wire rod is provided, such as Figure 4 As shown, the method includes:

[0081] Step 301 : obtaining an infrared thermal image of the wire rod to be temperature measured in real time, and determining an effective temperature measurement area based on the infrared thermal image and characteristic information of the wire rod to be temperature measured.

[0082] In the above embodiment of the present application, an infrared thermal image of the temperature-measured strip is acquired in real time, and an effective temperature measurement area is determined based on the infrared thermal image and characteristic information of the temperature-measured strip. By dynamically capturing the effective temperature measurement area, the accuracy of temperature measurement can be improved.

[0083] Step 302: construct a wire rod geometric model of the wire rod to be temperature measured, construct multiple light rays to be traced, determine the projection angle of each light ray to be traced and the inherent emissivity of the wire rod, and for any light ray to be traced, project the light ray to be traced onto the target projection point of the wire rod geometric model according to the corresponding projection angle, so that the light ray to be traced propagates according to the target projection point.

[0084] Optionally, in step 302, constructing a wire rod geometric model of the wire rod to be temperature measured includes:

[0085] Step 302-1, obtaining the wire rod geometric parameters of the wire rod to be temperature measured, wherein the wire rod geometric parameters include the spatial coordinate parameters of the wire rod to be temperature measured along the X-axis, the Y-axis and the Z-axis in a preset spatial coordinate system.

[0086] Step 302-2: constructing a wire rod geometric model of the wire rod to be temperature measured in a preset space coordinate system based on the space coordinate parameters.

[0087] Step 303 : tracing the ray propagation path of any ray to be traced after being projected in the wire rod geometric model, wherein the wire rod geometric model includes a plurality of target projection points.

[0088] Step 304: When the ray to be traced is projected onto the target projection point of the wire rod geometric model, a random number is generated. If the random number is greater than the intrinsic emissivity of the wire rod to be temperature measured, the ray to be traced is reflected.

[0089] Step 305: If the random number is smaller than the intrinsic emissivity of the wire rod to be temperature measured, the light to be tracked is absorbed.

[0090] Step 306 , calculating the local effective emissivity of the target projection point based on the number of absorbed rays to be traced and the total number of rays to be traced, and obtaining the effective emissivity of the wire rod geometric model based on the local effective emissivities of multiple target projection points.

[0091] Next, before calculating the effective emissivity of the wire rod, it is necessary to first establish a geometric model of the wire rod. According to the production site and the actual parameters of the wire rod (including wire rod diameter, wire rod diameter, roller speed, rolling speed, etc.), a three-dimensional wire rod surface model (wire rod geometric model) is established, such as Figure 5 As shown, the effective emissivity of the wire rod can then be calculated based on the Monte Carlo method and the constructed wire rod geometric model. Specifically, multiple rays to be tracked are constructed and projected onto the target projection point of the wire rod geometric model. In the wire rod geometric model, for any ray to be tracked, the light propagation path of the ray to be tracked after being projected is traced. If the random number is greater than the inherent emissivity of the wire rod to be measured, the ray to be tracked is reflected. If the random number is less than the inherent emissivity of the wire rod to be measured, the ray to be tracked is absorbed. Based on the number of absorbed rays to be tracked and the total number of rays to be tracked, the local effective emissivity of the target projection point is calculated. Based on the local effective emissivities of multiple target projection points, the effective emissivity of the wire rod geometric model is obtained.

[0092] Step 307: Filter the temperature measurement values ​​of the effective temperature measurement area to obtain a plurality of peak temperatures after filtering.

[0093] Step 308: Determine the peak effective emissivity within multiple change cycles based on the change cycle of the effective emissivity, calculate the peak temperature interference deviation value based on the difference between the peak effective emissivity and the intrinsic emissivity, and correct the peak temperature based on the peak temperature interference deviation value to obtain a corrected temperature measurement result.

[0094] Next, the temperature measurement values ​​of the effective temperature measurement area are filtered to obtain multiple peak temperatures after filtering. According to the variation period of the effective emissivity, the peak effective emissivity within multiple variation periods is determined. Based on the difference between the peak effective emissivity and the intrinsic emissivity, the peak temperature interference deviation value is calculated, and the peak temperature is corrected according to the peak temperature interference deviation value to obtain the corrected temperature measurement result. Specifically, the variation range of the effective emissivity is large, which will cause large fluctuations in the temperature measurement of the wire rod. Considering the mesh structure of the wire rod, its temperature values ​​are staggered, and the peak filtering method is used to improve the stability and reliability of the temperature measurement. Since the effective emissivity varies periodically, the temperature filtering space and time can be selected accordingly. Considering that the effective emissivity is periodic, the peak effective emissivity is also periodic and the peak temperature in each period is unique, a reasonable filtering space is selected to perform peak filtering on the temperature information. For the selection of the filtering space, the period of the effective emissivity, the width of the effective temperature measurement area and the control requirements of the lateral temperature (perpendicular to the transmission direction) are comprehensively considered. When choosing the filtering time, it is necessary to ensure that the peak temperature can be captured in a non-uniform overlap state while retaining a certain amount of effective temperature information. To this end, the peak temperature of the effective temperature measurement area can be corrected based on the peak effective emissivity. Since the effective temperature measurement area at the edge of the wire rod can be stacked up to 50-200mm thick in the actual overlap state, this area is greatly affected by effective radiation. The temperature value obtained by the thermal imager is obtained based on the inherent emissivity of the wire rod. In order to obtain more accurate temperature measurement results, the temperature measurement value of this area needs to be corrected. Due to the uniqueness of the peak effective emissivity within the same period and the correspondence between the peak effective emissivity and the peak temperature, the peak temperature obtained after peak filtering in the effective temperature measurement area is corrected based on the difference between the peak effective emissivity within the same period and the inherent emissivity of the wire rod, thereby obtaining a more stable and accurate temperature measurement result.

[0095] Furthermore, based on precise temperature measurement and temperature field measurements, a transverse temperature distribution curve for the wire rod can be obtained. This curve is used to guide the air volume configuration of the "Jialing" device and improve the uniformity of wire rod cooling. Furthermore, by arranging multiple measurement points, a temperature curve for the wire rod throughout the cooling process can be obtained, which is used to monitor and control the cooling rate of the wire rod to achieve the desired product quality performance.

[0096] By applying the technical solution of this embodiment, after the temperature measurement system is installed according to the actual parameters of the production site, the infrared thermal image of the wire rod captured by the thermal imager is analyzed and processed using the image processing method, thereby dynamically capturing the effective temperature measurement area of ​​the wire rod during the movement of the wire rod. At the same time, according to the calculation results of the effective emissivity calculation model, a reasonable filtering space and time are selected to perform peak filtering on the temperature measurement information of the wire rod and correct the peak temperature, and finally the temperature value of the wire rod is obtained, thereby improving the accuracy and stability of the temperature measurement.

[0097] Furthermore, as a refinement and expansion of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, another temperature measurement method for wire rod is provided, such as Figure 6 As shown, the method includes:

[0098] Step 401 : acquiring an infrared thermal image of the wire rod to be temperature-measured in real time, performing spatial transformation on the infrared thermal image according to the shooting angle of the infrared thermal image, and obtaining the physical position of each pixel in the infrared thermal image.

[0099] Step 402: determining a wire rod area according to the physical position and characteristic information of the wire rod to be temperature measured, and determining an effective temperature measurement area based on the wire rod area and a preset offset distance.

[0100] In an embodiment of the present application, an infrared thermal image of the wire rod to be temperature-measured is acquired in real time, and the infrared thermal image is spatially transformed according to the shooting angle of the infrared thermal image. Specifically, the temperature measurement system is calibrated to determine the installation geometric parameters of the thermal imager. The image is spatially transformed according to the principle of geometric transformation, and the positional relationship between the pixels in the thermal image and the actual physical space is established to obtain the physical position of each pixel in the infrared thermal image. Again, the pixel points on the thermal image are traversed using the knowledge of image processing. The wire rod area is determined based on the physical position and the characteristic information of the wire rod to be temperature-measured. Based on the wire rod area and the preset deviation distance, the effective temperature measurement area is determined. By dynamically capturing the effective temperature measurement area during the wire rod temperature measurement process, the accuracy of the temperature measurement can be improved.

[0101] Step 403, obtain the wire rod geometric parameters of the wire rod to be temperature measured, and based on the spatial coordinate parameters, construct a wire rod geometric model of the wire rod to be temperature measured in a preset spatial coordinate system, wherein the wire rod geometric parameters include the spatial coordinate parameters of the wire rod to be temperature measured along the X-axis, Y-axis and Z-axis in the preset spatial coordinate system.

[0102] Next, the wire rod geometric parameters of the wire rod to be measured are obtained, wherein the wire rod geometric parameters include the spatial coordinate parameters of the wire rod to be measured along the X axis, Y axis and Z axis in the preset spatial coordinate system, and based on the spatial coordinate parameters, a wire rod geometric model of the wire rod to be measured is constructed in the preset spatial coordinate system (such as Figure 5 By establishing a wire rod geometry model, the effective emissivity can be calculated based on the wire rod geometry model, and then the measured temperature can be corrected based on the effective emissivity.

[0103] Step 404, construct multiple light rays to be traced, and project the light rays to be traced onto the target projection points of the wire rod geometric model respectively. In the wire rod geometric model, for any light ray to be traced, trace the light propagation path of the light ray to be traced after being projected, and determine whether the light ray to be traced is absorbed by the wire rod geometric model based on the light propagation path, wherein the wire rod geometric model includes multiple target projection points.

[0104] Step 405 , calculating the local effective emissivity of the target projection point based on the number of absorbed rays to be traced and the total number of rays to be traced, and obtaining the effective emissivity of the wire rod geometric model based on the local effective emissivities of multiple target projection points.

[0105] Next, multiple light rays to be traced are constructed, and the light rays to be traced are projected onto the target projection points of the wire rod geometric model respectively. In the wire rod geometric model, for any light ray to be traced, the light propagation path of the light ray to be traced after being projected is traced. According to the light propagation path, it is determined whether the light ray to be traced is absorbed by the wire rod geometric model. According to the number of absorbed light rays to be traced and the total number of light rays to be traced, the local effective emissivity of the target projection point is calculated. According to the local effective emissivity of multiple target projection points, the effective emissivity of the wire rod geometric model is obtained.

[0106] Step 406 : Based on the effective emissivity, correct the temperature measurement value of the effective temperature measurement area to obtain a corrected temperature measurement result.

[0107] Next, based on the effective emissivity, the temperature measurement value of the effective temperature measurement area is corrected to obtain a corrected temperature measurement result.

[0108] In a specific embodiment, the temperature of a random complete wire rod with a wire diameter of 16 mm at the production site is measured using the embodiment of the present application and a scanning thermometer. The temperature fluctuation of the embodiment of the present application is 13°C, while the temperature fluctuation of the scanning point thermometer is 27°C. The standard deviation of the two is calculated at the same time: the scanning point thermometer and the embodiment of the present application are 7.64°C and 2.80°C respectively. Therefore, the embodiment of the present application significantly improves the stability of temperature measurement. By correcting the temperature, the accuracy of the wire rod temperature measurement value can be improved by 15 to 20°C. According to the method of the embodiment of the present application, the temperature of a random complete wire rod with a wire diameter of 16 mm is measured, and the temperature measurement data is temperature processed using the processing method of the present invention to obtain a temperature distribution curve of the cross section of the wire rod. According to the distribution curve, it is determined that the temperature of the overlapping areas on both sides of the wire rod is higher than the temperature of the middle area of ​​the wire rod. Therefore, the Jialing device under the roller can be reasonably adjusted to adjust the air volume of each part to achieve uniform cooling of the wire rod.

[0109] By applying the technical solution of this embodiment, an infrared thermal image of the wire rod to be temperature-measured is acquired in real time. The infrared thermal image is spatially transformed based on the shooting angle of the infrared thermal image to determine the wire rod area. Based on the wire rod area and a preset offset distance, an effective temperature measurement area is determined. The wire rod geometric parameters of the wire rod to be temperature-measured are acquired, and a wire rod geometric model of the wire rod to be temperature-measured is constructed in a preset spatial coordinate system based on the spatial coordinate parameters. Multiple traceable rays are constructed and projected onto target projection points of the wire rod geometric model. For each traceable ray, the propagation path of the projected ray is traced within the wire rod geometric model. Based on the ray propagation path, it is determined whether the traced ray is absorbed by the wire rod geometric model. The local effective emissivity of the target projection point is calculated based on the number of absorbed traced rays and the total number of traced rays. The effective emissivity of the wire rod geometric model is obtained based on the local effective emissivity of the multiple target projection points. Based on the effective emissivity, the temperature measurement value of the effective temperature measurement area is corrected to obtain a corrected temperature measurement result. This improves the accuracy of wire rod temperature measurement.

[0110] Further, as Figure 1 The specific implementation of the method, the embodiment of the present application provides a temperature measuring device for wire rod, such as Figure 7 As shown, the device includes:

[0111] Infrared thermal image acquisition module 501, used for acquiring infrared thermal images of the wire rod to be temperature measured in real time;

[0112] An effective measurement area determination module 502 is configured to determine an effective temperature measurement area based on the infrared thermal image and characteristic information of the wire rod to be temperature measured;

[0113] An effective emissivity calculation module 503 is configured to construct a geometric model of the wire rod to be temperature-measured, project a predetermined light onto the wire rod geometric model, trace the light propagation path of the predetermined light, and calculate the effective emissivity based on the traced result of the light propagation path;

[0114] The temperature correction module 504 is configured to correct the temperature measurement value of the effective temperature measurement area based on the effective emissivity to obtain a corrected temperature measurement result.

[0115] Optionally, the effective emissivity calculation module 503 is further configured to:

[0116] Constructing a plurality of rays to be traced, and projecting the rays to be traced onto target projection points of the wire rod geometric model, wherein the wire rod geometric model includes the plurality of target projection points;

[0117] In the wire rod geometric model, for any ray to be traced, tracing the ray propagation path of the ray to be traced after being projected, and determining whether the ray to be traced is absorbed by the wire rod geometric model based on the ray propagation path;

[0118] The local effective emissivity of the target projection point is calculated according to the number of absorbed rays to be traced and the total number of rays to be traced. The effective emissivity of the wire rod geometric model is obtained according to the local effective emissivity of multiple target projection points.

[0119] Optionally, the effective emissivity calculation module 503 is further configured to:

[0120] Determine the projection angle of each ray to be traced and the intrinsic emissivity of the wire rod;

[0121] For any light ray to be traced, the light ray to be traced is projected onto a target projection point of the wire rod geometric model according to a corresponding projection angle, so that the light ray to be traced is propagated according to the target projection point.

[0122] Optionally, the effective emissivity calculation module 503 is further configured to:

[0123] When the ray to be traced is projected onto the target projection point of the wire rod geometric model, a random number is generated. If the random number is greater than the intrinsic emissivity of the wire rod to be temperature measured, the ray to be traced is reflected.

[0124] If the random number is smaller than the intrinsic emissivity of the wire rod to be temperature measured, the light to be tracked is absorbed.

[0125] Optionally, the temperature correction module 504 is further configured to:

[0126] Filtering the temperature measurement values ​​of the effective temperature measurement area to obtain a plurality of peak temperatures after filtering;

[0127] According to the change cycle of the effective emissivity, the peak effective emissivity within multiple change cycles is determined, and based on the difference between the peak effective emissivity and the intrinsic emissivity, the peak temperature interference deviation value is calculated, and the peak temperature is corrected according to the peak temperature interference deviation value to obtain a corrected temperature measurement result.

[0128] Optionally, the effective measurement area determining module 502 is further configured to:

[0129] Perform spatial transformation on the infrared thermal image according to the shooting angle of the infrared thermal image to obtain the physical position of each pixel in the infrared thermal image;

[0130] The wire rod area is determined according to the physical position and characteristic information of the wire rod to be temperature measured, and the effective temperature measurement area is determined based on the wire rod area and the preset deviation distance.

[0131] Furthermore, the present application provides another temperature measuring device for wire rods, such as Figure 8 As shown, the device includes:

[0132] Infrared thermal image acquisition module 601, used for acquiring infrared thermal images of the wire rod to be measured in real time;

[0133] An effective measurement area determination module 602 is configured to determine an effective temperature measurement area based on the infrared thermal image and characteristic information of the wire rod to be temperature measured;

[0134] An effective emissivity calculation module 603 is configured to construct a geometric model of the wire rod to be temperature-measured, project a predetermined light onto the geometric model, trace the light propagation path of the predetermined light, and calculate the effective emissivity based on the traced light propagation path.

[0135] The temperature correction module 604 is configured to correct the temperature measurement value of the effective temperature measurement area based on the effective emissivity to obtain a corrected temperature measurement result.

[0136] The geometric model construction module 605 is used to obtain the wire rod geometric parameters of the wire rod to be temperature measured, wherein the wire rod geometric parameters include the spatial coordinate parameters of the wire rod to be temperature measured along the X-axis, Y-axis and Z-axis in the preset spatial coordinate system, and based on the spatial coordinate parameters, the wire rod geometric model of the wire rod to be temperature measured is constructed in the preset spatial coordinate system.

[0137] Optionally, the effective emissivity calculation module 603 is further configured to:

[0138] Constructing a plurality of rays to be traced, and projecting the rays to be traced onto target projection points of the wire rod geometric model, wherein the wire rod geometric model includes the plurality of target projection points;

[0139] In the wire rod geometric model, for any ray to be traced, tracing the ray propagation path of the ray to be traced after being projected, and determining whether the ray to be traced is absorbed by the wire rod geometric model based on the ray propagation path;

[0140] The local effective emissivity of the target projection point is calculated according to the number of absorbed rays to be traced and the total number of rays to be traced. The effective emissivity of the wire rod geometric model is obtained according to the local effective emissivity of multiple target projection points.

[0141] Optionally, the effective emissivity calculation module 603 is further configured to:

[0142] Determine the projection angle of each ray to be traced and the intrinsic emissivity of the wire rod;

[0143] For any light ray to be traced, the light ray to be traced is projected onto a target projection point of the wire rod geometric model according to a corresponding projection angle, so that the light ray to be traced is propagated according to the target projection point.

[0144] Optionally, the effective emissivity calculation module 603 is further configured to:

[0145] When the ray to be traced is projected onto the target projection point of the wire rod geometric model, a random number is generated. If the random number is greater than the intrinsic emissivity of the wire rod to be temperature measured, the ray to be traced is reflected.

[0146] If the random number is smaller than the intrinsic emissivity of the wire rod to be temperature measured, the light to be tracked is absorbed.

[0147] Optionally, the temperature correction module 604 is further configured to:

[0148] Filtering the temperature measurement values ​​of the effective temperature measurement area to obtain a plurality of peak temperatures after filtering;

[0149] According to the change cycle of the effective emissivity, the peak effective emissivity within multiple change cycles is determined, and based on the difference between the peak effective emissivity and the intrinsic emissivity, the peak temperature interference deviation value is calculated, and the peak temperature is corrected according to the peak temperature interference deviation value to obtain a corrected temperature measurement result.

[0150] Optionally, the effective measurement area determining module 602 is further configured to:

[0151] Perform spatial transformation on the infrared thermal image according to the shooting angle of the infrared thermal image to obtain the physical position of each pixel in the infrared thermal image;

[0152] The wire rod area is determined according to the physical position and characteristic information of the wire rod to be temperature measured, and the effective temperature measurement area is determined based on the wire rod area and the preset deviation distance.

[0153] It should be noted that for other corresponding descriptions of the functional units involved in the temperature measurement device for wire rod provided in the embodiment of the present application, reference can be made to Figure 1 、 Figure 4 and Figure 6 The corresponding description in the method will not be repeated here.

[0154] Based on the above Figure 1 、 Figure 4 and Figure 6 The method shown in FIG. 1 is a method for performing the above-mentioned operation. Accordingly, the embodiment of the present application further provides a storage medium on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned operation is performed. Figure 1 、 Figure 4 and Figure 6The temperature measurement method for wire rod is shown.

[0155] Based on this understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, USB flash drive, mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each implementation scenario of the present application.

[0156] Based on the above Figure 1 、 Figure 4 and Figure 6 The method shown, and Figure 7 、 Figure 8 In order to achieve the above-mentioned purpose, the embodiment of the present application further provides a computer device, which can be a personal computer, a server, a network device, etc. The computer device includes a storage medium and a processor; the storage medium is used to store a computer program; the processor is used to execute the computer program to achieve the above-mentioned Figure 1 、 Figure 4 and Figure 6 The temperature measurement method for wire rod is shown.

[0157] Optionally, the computer device may further include a user interface, a network interface, a camera, a radio frequency (RF) circuit, a sensor, an audio circuit, a Wi-Fi module, etc. The user interface may include a display, an input unit such as a keyboard, etc., and the optional user interface may also include a USB interface, a card reader interface, etc. The network interface may optionally include a standard wired interface, a wireless interface (such as a Bluetooth interface, a Wi-Fi interface), etc.

[0158] Those skilled in the art will understand that the computer device structure provided in this embodiment does not constitute a limitation on the computer device, and may include more or fewer components, or a combination of certain components, or different component arrangements.

[0159] The storage medium may also include an operating system and a network communication module. An operating system is a program that manages and stores the hardware and software resources of a computer device, supporting the execution of information processing programs and other software and / or programs. The network communication module facilitates communication between components within the storage medium, as well as with other hardware and software within the physical device.

[0160] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present application can be implemented by means of software plus the necessary general hardware platform, or by means of hardware. The present application discloses a temperature measurement method and device for wire rods, a storage medium, and a computer device. The method includes: acquiring an infrared thermal image of the wire rod to be measured in real time; determining an effective temperature measurement area based on the infrared thermal image and the characteristic information of the wire rod to be measured; constructing a wire rod geometric model of the wire rod to be measured, projecting a preset light onto the wire rod geometric model and tracing the light propagation path of the preset light, and calculating the effective emissivity based on the tracing result of the light propagation path; based on the effective emissivity, correcting the temperature measurement value of the effective temperature measurement area to obtain a corrected temperature measurement result. By acquiring an infrared thermal image and analyzing the infrared thermal image using an image processing method, dynamic capture of the effective temperature measurement area is achieved; by calculating and analyzing the effective emissivity between the wire rods; and then correcting the measured temperature of the wire rod, the accuracy and stability of the temperature measurement are improved.

[0161] Those skilled in the art will understand that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily required to implement the present application. Those skilled in the art will understand that the modules in the devices in the implementation scenario can be distributed in the devices of the implementation scenario according to the implementation scenario description, or can be changed accordingly and located in one or more devices different from the implementation scenario. The modules of the above-mentioned implementation scenario can be combined into one module, or can be further split into multiple sub-modules.

[0162] The serial numbers of the above application are for descriptive purposes only and do not represent the advantages or disadvantages of the implementation scenarios. The above disclosure only discloses several specific implementation scenarios of the present application, but the present application is not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present application.

Claims

1. A method for measuring the temperature of a wire rod, characterized in that: The method comprises: During the transportation of the wire rod to be measured along the roller conveyor, a fixedly installed thermal imager is used to obtain an infrared thermal image of the wire rod to be measured that appears within the current shooting angle of the thermal imager in real time. The thermal imager is installed at a position where the shooting angle can completely cover the entire area where the wire rod to be measured is located. The wire rod to be measured is a mesh structure that overlaps each other, and the wire rod to be measured has an inherent emissivity. Determine a real-time effective temperature measurement area based on the infrared thermal image, the temperature characteristics of the temperature-measured wire rod, and the difference in the surrounding environment, and measure the temperature of the effective temperature measurement area in real time, wherein the temperature of the effective temperature measurement area changes periodically, and any period corresponds to a peak temperature; Constructing a wire rod geometric model of the wire rod to be temperature-measured, projecting a preset light onto the wire rod geometric model and tracing the light propagation path of the preset light, and calculating the effective emissivity based on the tracing results of the light propagation path, wherein the effective emissivity of the wire rod to be temperature-measured with a mesh structure varies periodically, with a peak effective emissivity corresponding to any period; For any period, the peak temperature of the effective temperature measurement area in the period is corrected according to the difference between the peak effective emissivity and the intrinsic emissivity in the period to obtain a corrected temperature measurement result.

2. The method according to claim 1, characterized in that The effective emissivity that changes periodically corresponds to a change period. For any period, the peak temperature of the effective temperature measurement area in the period is corrected according to the difference between the peak effective emissivity and the intrinsic emissivity in the period to obtain a corrected temperature measurement result, including: Filtering the temperature measurement values ​​of the effective temperature measurement area to obtain a plurality of peak temperatures after filtering; According to the change cycle of the effective emissivity, the peak effective emissivity within multiple change cycles is determined, and based on the difference between the peak effective emissivity and the intrinsic emissivity, the peak temperature interference deviation value is calculated, and the peak temperature is corrected according to the peak temperature interference deviation value to obtain a corrected temperature measurement result.

3. The method according to claim 1, characterized in that The method of determining a real-time effective temperature measurement area according to the difference between the infrared thermal image, the temperature characteristics of the wire rod to be measured, and the surrounding environment includes: Perform spatial transformation on the infrared thermal image in real time according to the shooting angle of the infrared thermal image to obtain the physical position of each pixel in the infrared thermal image; According to the physical position and the temperature characteristics of the wire rod to be measured and the difference in the surrounding environment, the wire rod area is determined in real time, and based on the wire rod area and the preset deviation distance, the effective temperature measurement area is determined in real time.

4. The method according to any one of claims 1 to 3, characterized in that The method of constructing a wire rod geometric model of the wire rod to be temperature measured comprises: Obtaining geometric parameters of the wire rod to be temperature-measured, wherein the geometric parameters of the wire rod include spatial coordinate parameters of the wire rod to be temperature-measured along the X-axis, the Y-axis, and the Z-axis in a preset spatial coordinate system; Based on the spatial coordinate parameters, a wire rod geometric model of the wire rod to be temperature measured is constructed in a preset spatial coordinate system.

5. A temperature measuring device for wire rod, characterized in that: The device comprises: An infrared thermal image acquisition module is used to acquire, in real time, an infrared thermal image of the wire rod to be measured that appears within the current shooting angle of the thermal imager while the wire rod to be measured is being transported along the roller conveyor, based on a fixedly mounted thermal imager. The thermal imager is mounted at a position where the shooting angle can completely cover the entire area where the wire rod to be measured is located. The wire rod to be measured is a mesh structure that overlaps each other, and the wire rod to be measured has an inherent emissivity. an effective temperature measurement area determination module, configured to determine a real-time effective temperature measurement area based on the infrared thermal image, the temperature characteristics of the temperature-measured wire rod, and the differences in the surrounding environment, and to measure the temperature of the effective temperature measurement area in real time, wherein the temperature of the effective temperature measurement area varies periodically, and a peak temperature corresponds to any period; A geometric model building module is used to build a wire rod geometric model of the wire rod to be temperature measured; an effective emissivity calculation module, configured to project a preset light onto the wire rod geometric model and trace the light propagation path of the preset light, and calculate the effective emissivity based on the tracing result of the light propagation path, wherein the effective emissivity of the wire rod to be measured with a mesh structure varies periodically, and a peak effective emissivity corresponds to any period; The temperature correction module is used to correct the peak temperature of the effective temperature measurement area in any period according to the difference between the peak effective emissivity and the intrinsic emissivity in the period to obtain a corrected temperature measurement result.

6. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for measuring the temperature of a wire rod according to any one of claims 1 to 4 is implemented.

7. A computer device comprising a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein: When the processor executes the computer program, the method for measuring temperature of a wire rod according to any one of claims 1 to 4 is implemented.

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