A method and system for continuously monitoring the surface temperature distribution of a continuously cast bloom

Abstract

The application discloses a method for continuously monitoring surface temperature distribution of a continuously cast shaped blank, comprising the following steps: S1, monitoring point setting; S2, after pouring starts, when the continuously cast shaped blank enters the detection range of a signal collector, the surface temperature of the cast blank is measured; S3, automatic calibration of R-angle position; S4, automatic calibration of web middle; S5, calibration of wing top middle position; S6, according to the rough setting temperature and the calculation result. The application can monitor the internal temperature of the shaped blank, track the temperature change of the inner arc in real time, monitor the status in the secondary cooling chamber in real time, avoid the equipment and process abnormalities from causing the temperature of the cast blank to change sharply, and cause the production interruption or quality abnormality.

Description

Technical Field

[0001] This invention relates to the field of continuous casting of irregularly shaped billets. Background Technology

[0002] In continuous casting production, the cooling system is one of the key systems affecting the smooth operation of continuous casting and the quality of the cast billet. It also provides process support for technologies such as casting speed, light (heavy) reduction, and electromagnetic stirring. Furthermore, it is the technological foundation for ensuring that the cast billet does not suffer from quality defects such as "bulging," "dentation," and "corner cracks." The surface temperature of the cast billet directly reflects the secondary cooling status. Therefore, measuring and monitoring the surface temperature of the cast billet in the secondary cooling chamber allows for a rapid and direct evaluation of the continuous casting machine's cooling status. Temperature fluctuations can be used to promptly identify problems in the cooling system, providing technical support for the rapid evaluation of the surface and internal quality of the cast billet and for the rapid detection and resolution of problems occurring during production.

[0003] In measuring the surface temperature of cast billets, continuous monitoring is a commonly used technique. However, unlike regular billets such as slabs and square billets, irregularly shaped billets exhibit significant temperature non-uniformity across their cross-sections, with large temperature differences. This necessitates tracking five monitoring points across three locations: the radius (R-angle), the middle of the web, and the tip of the flange. Furthermore, irregularly shaped billets are often produced on a single casting machine with multiple cross-sections. Rapidly and intelligently determining the location of each key monitoring point and adjusting and monitoring it promptly after switching between different cross-sections presents another challenge in monitoring the surface temperature of irregularly shaped billets. Therefore, developing surface temperature monitoring technology for irregularly shaped billets, tailored to their cross-sectional shape, is of great significance for improving the surface and internal quality of irregularly shaped billets and ensuring stable and smooth continuous casting production.

[0004] For example, the published document with announcement number CN114088213A and patent title "A non-contact temperature measuring device and temperature measuring method for the surface of a continuously cast billet" discloses a non-contact temperature measuring device and temperature measuring method that measures the surface temperature of the billet in a sector section using an infrared temperature measuring probe. However, it is a single-point measurement and does not have the function of measuring the surface temperature distribution of the billet, nor does it have the ability to dynamically adjust the monitoring position.

[0005] Therefore, there is currently a lack of a method suitable for continuous monitoring of the surface temperature distribution of irregularly shaped billets in the secondary cooling zone of continuous casting. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to realize a method for continuous monitoring of the surface temperature distribution of shaped billets in the secondary cooling zone of continuous casting, to realize the analysis of the surface temperature distribution of shaped billets and the real-time monitoring of the temperature at key positions such as the web, R angle, and flange tip, and to judge and predict the equipment status and quality of shaped billets.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a method for continuous monitoring of surface temperature distribution in continuous casting of irregularly shaped billets, comprising the following steps:

[0008] S1. Monitoring point setting;

[0009] S2. After casting begins, when the continuously cast irregular billet enters the detection range of the signal acquisition device, the surface temperature of the billet is measured.

[0010] Automatic calibration of S3 and R angle positions;

[0011] S4. Automatic calibration of the middle of the web;

[0012] S5, Wing top center position marking;

[0013] S6. Based on the rough temperature and calculation results.

[0014] S1 includes:

[0015] Step 1: Select a rough inspection line based on the cross-section of the continuously cast irregular billet;

[0016] Step 2: Determine the position of the radius (R) based on the highest temperature;

[0017] Step 3: Calculate the position of the center of the web based on the position of the radius (R).

[0018] Step 4: Calculate the position of the flange center based on the center of the web;

[0019] Step 5: Once the five locations are determined, continuous monitoring begins.

[0020] Method for selecting the rough detection line:

[0021] Step 1: Set the detection line to be divided into two parts, covering the two radius corners, the flange and the web respectively;

[0022] Step 2: The two test lines are not connected at the web.

[0023] Step 3: The two inspection lines are on the same line and perpendicular to the throwing direction.

[0024] In step S3, based on the detected surface temperature distribution of the continuously cast shaped billet, the temperature data on the initially set detection line is analyzed. Based on the characteristics of the surface temperature distribution of the shaped billet, the positions of the two highest temperature points are determined to be the two R-angle positions of the billet. These two points are set as continuous tracking points to track the temperature changes at the R-angle positions.

[0025] In step S4, based on the two already calibrated R-angle monitoring points, the two points are connected to take the midpoint, and this position is set as the web center temperature tracking point to continuously track temperature changes.

[0026] In step S5, the cross-section of the continuously cast shaped billet is H-shaped. The data processor inputs the billet cross-sectional data, including the outer width H and the flange width T'. Based on the pre-input billet cross-sectional data, the dimensions of H and T' are obtained, and the distance from the center of the web to the center of the flange is calculated. From the center point of the web, the distance is shifted to both sides by (H-T') / 2 to locate the center position of each flange, and this point is marked as the preset flange center temperature monitoring point to continuously track temperature changes.

[0027] In step S6, once the monitoring points are set, the signal acquisition device begins to continuously monitor the temperature monitoring points at the center of the web, the R-angle, and the tip of the flange, tracking the temperature of the five points in real time to form a temperature tracking curve.

[0028] It also includes S7, which sets the temperature change range for each point and triggers an alarm when the temperature of a point is consistently higher or lower than this range.

[0029] A system for continuous monitoring of surface temperature distribution of irregularly shaped billets in continuous casting includes a signal acquisition device for measuring the surface temperature of the billet and a data processor connected to the signal acquisition device for analyzing, processing and recording data. The signal acquisition device is installed above the irregularly shaped billet continuous casting production line and collects images of the surface temperature of the continuously cast irregularly shaped billet downwards.

[0030] The signal acquisition device is an infrared thermal imager, and the data processor is a computer.

[0031] This invention can monitor the internal temperature of irregularly shaped billets, track changes in the inner arc temperature in real time, and monitor the condition of the secondary cooling chamber in real time, so as to avoid production interruption or quality abnormalities caused by drastic changes in billet temperature due to equipment and process abnormalities. Attached Figure Description

[0032] The following is a brief explanation of the content and markings in each of the accompanying drawings in this specification:

[0033] Figure 1 This is a schematic diagram of the system configuration;

[0034] Figure 2 This is a rough schematic diagram of the detection line;

[0035] Figure 3 Establish procedures for key monitoring points of irregularly shaped billets;

[0036] Figure 4 A schematic diagram for calibrating the position of the radius (R).

[0037] Figure 5 A schematic diagram showing the marking of the middle position of the web;

[0038] Figure 6 A schematic diagram showing the position of the wing tip;

[0039] Figure 7 A schematic diagram showing the external dimensions and key temperature monitoring points of the irregularly shaped billet;

[0040] Figure 8 A schematic diagram showing the temperature distribution characteristics of the cross-section of an irregularly shaped billet;

[0041] Figure 9 This is a schematic diagram of the temperature monitoring points on the cross-section of the irregularly shaped billet.

[0042] Figure 10 Example of surface temperature monitoring for a certain irregularly shaped billet (cross-sectional dimensions: 1300×510×140mm);

[0043] Figure 11 To adjust for temperature changes at the top of the north wing (section dimensions: 1300×510×140mm);

[0044] The markings in the above figures are: 1. Data processor; 2. Signal acquisition device; 3. Coarse detection line; 4. Highest temperature point; 5. Middle of web; 6. R-angle monitoring point; 7. Middle of flange. Detailed Implementation

[0045] The following description, with reference to the accompanying drawings, details the specific implementation of the present invention, including the shape and structure of each component, the relative positions and connections between the parts, the function and working principle of each part, the manufacturing process, and the operation and use methods, to help those skilled in the art to have a more complete, accurate, and in-depth understanding of the inventive concept and technical solution of the present invention.

[0046] The method for monitoring the surface temperature of irregularly shaped billets is applicable to the monitoring of the surface temperature of irregularly shaped billets in continuous casting, such as... Figure 1 As shown, the system includes a signal acquisition device for measuring the surface temperature of the billet and a data processor for analyzing, processing and recording data. The signal acquisition device is generally an infrared thermal imager, and the data processor is generally a computer. The acquisition point of the signal acquisition device is located directly above the irregular billet, and the detection range is larger than the maximum cross-section of the irregular billet.

[0047] The above system utilizes a thermal imager for temperature monitoring, leverages the temperature distribution characteristics of irregularly shaped billets, and employs computer-aided calculations to achieve rapid and continuous monitoring of the surface temperature of irregularly shaped billets. Figure 7 As shown in the example, a certain irregular billet was subjected to temperature monitoring using the present invention. Through temperature monitoring, it was found that the temperature at the top of the north flange was significantly lower. Through inspection in the secondary cooling chamber, it was found that there was obvious water flow at the top of the flange on the north side, causing local overcooling at the top of the flange. After adjusting the north side and eliminating the overcooling of the flange, the surface temperature of the billet rose significantly.

[0048] The slab cross-sectional data, including the two key dimensions of the slab outer width (H) and flange width (T'), are entered into the computer. This data needs to be entered in advance and changed according to the product being inspected during production. During operation, the computer sets the detection line coarseness within the detection range based on the slab cross-sectional dimension data.

[0049] See Figure 2 Principles for setting the coarseness of the detection line:

[0050] 1) The detection line is set to be divided into two parts, covering the two radius corners and part of the flange and web respectively;

[0051] 2) The two detection lines are not connected at the web, that is, the temperature of the two detection lines is measured and counted separately;

[0052] 3) The two inspection lines are on the same line and perpendicular to the direction of billet pulling.

[0053] The monitoring method of this system is as follows:

[0054] The S1 monitoring point setting process involves frequent changes to the cross-sections of the irregular-shaped billet casting machine. These cross-sections exhibit significant positional deviations, and the billet position may slightly shift after each cross-section change. Therefore, a rapid setting of the monitoring points is required before each monitoring session. This setting is automatically completed by the data processor. The process is described below. Figure 3 This includes the following steps:

[0055] Step 1: Select a rough inspection line based on the cross-section of the continuously cast irregular billet;

[0056] Step 2: Determine the position of the radius (R) based on the highest temperature;

[0057] Step 3: Calculate the position of the center of the web based on the position of the radius (R).

[0058] Step 4: Calculate the position of the flange center based on the center of the web;

[0059] Step 5: Once the five locations are determined, continuous monitoring begins.

[0060] After the S2 pouring begins, when the hot billet enters the detection range of the signal acquisition device, the surface temperature of the billet is measured.

[0061] Automatic calibration of the S3 R angle position: The computer analyzes the temperature data on the initially designed detection line based on the temperature distribution of the billet surface detected by the signal acquisition device, and considers the characteristics of the surface temperature distribution of the irregular billet (see...). Figure 7 This allows us to determine that the two points with the highest temperatures are the two R-angle positions of the billet. These two points can be set as continuous tracking points to track the temperature changes at the R-angle positions.

[0062] S4 Automatic calibration of the web center: Based on the two already calibrated R-angle monitoring points, connect the two points, take the midpoint, and set this position as the web center temperature tracking point to continuously track temperature changes;

[0063] S5 Flange Top Center Position Calibration: Based on the current billet cross-sectional dimensions entered into the computer, calculate the distance from the web center to the flange top center using dimensions H and T'. From the web center point, shift the distance to the left (right) by (H-T') / 2. This position is the center position of the two flanges, and mark this point as the preset flange top center temperature monitoring point to continuously track temperature changes.

[0064] Based on the rough temperature and calculation results, the computer sets the monitoring points and the signal acquisition device starts to continuously monitor the temperature monitoring points of the web center, R angle, and flange tip, tracking the temperature of the five points in real time and forming a temperature tracking curve.

[0065] The S7 allows you to set the temperature variation range for each point. When the temperature at a certain point is consistently higher or lower than this range, the computer can issue a temperature abnormality alarm, indicating that there is a problem with the cooling at that location.

[0066] The above-mentioned method for monitoring the surface temperature of irregular billets enables analysis of the surface temperature distribution of irregular billets and real-time monitoring of the temperature at key locations such as the web, R-angle, and flange tip, allowing for judgment and prediction of the equipment status and quality of irregular billets.

[0067] Specifically, it has the following advantages:

[0068] (1) Based on the cross-sectional shape and cooling characteristics of the irregular billet, analyze the monitoring points and their locations, and monitor the changes in the surface temperature of the irregular billet in real time.

[0069] (2) It can realize multi-section temperature monitoring of irregular billets, and can quickly and automatically adjust to find key temperature detection points according to the cross-sectional shape and temperature distribution characteristics of the billet;

[0070] (3) It can simultaneously realize real-time analysis of surface temperature distribution of irregular blanks and continuous monitoring of temperature changes of key detection points over time.

[0071] (4) This system can interact with the continuous casting water distribution model and the quality model. Based on the surface temperature distribution and changes, it can predict the condition of the fan-shaped nozzle, the cooling condition and the quality of the billet, thereby improving the quality control capability of the irregular billet and the maintenance efficiency of the continuous casting equipment.

[0072] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A method for continuous monitoring of surface temperature distribution in continuous casting of irregularly shaped billets, characterized in that, Includes the following steps: S1. Monitoring point setting; S2. After casting begins, when the continuously cast irregular billet enters the detection range of the signal acquisition device, the surface temperature of the billet is measured. Automatic calibration of S3 and R angle positions; S4. Automatic calibration of the middle of the web; S5, Wing top center position marking; S6. Based on the rough temperature and calculation results, the monitoring points are set and completed. The signal acquisition device starts to continuously monitor the temperature monitoring points of the web center, R angle, and flange tip, and tracks the temperature of the five points in real time to form a temperature tracking curve. S1 includes: Step 1: Select a rough inspection line based on the cross-section of the continuously cast irregular billet; Step 2: Determine the position of the radius (R) based on the highest temperature; Step 3: Calculate the position of the center of the web based on the position of the radius (R). Step 4: Calculate the position of the flange center based on the center of the web; Step 5: Once the five locations are determined, begin continuous monitoring; Method for selecting the rough detection line: Step 1: Set the detection line to be divided into two parts, covering the two radius corners, the flange and the web respectively; Step 2: The two test lines are not connected at the web. Step 3: The two inspection lines are on the same line and perpendicular to the throwing direction.

2. The method for continuous monitoring of surface temperature distribution in continuous casting of irregularly shaped billets according to claim 1, characterized in that: In step S3, based on the detected surface temperature distribution of the continuously cast shaped billet, the temperature data on the initially set detection line is analyzed. Based on the characteristics of the surface temperature distribution of the shaped billet, the positions of the two highest temperature points are determined to be the two R-angle positions of the billet. These two points are set as continuous tracking points to track the temperature changes at the R-angle positions.

3. The method for continuous monitoring of surface temperature distribution in continuous casting of irregularly shaped billets according to claim 2, characterized in that: In step S4, based on the two already calibrated R-angle monitoring points, the two points are connected to take the midpoint, and this position is set as the web center temperature tracking point to continuously track temperature changes.

4. The method for continuous monitoring of surface temperature distribution in continuous casting of irregularly shaped billets according to claim 3, characterized in that: In step S5, the cross-section of the continuously cast shaped billet is H-shaped. The data processor inputs the billet cross-sectional data, including the outer width H and the flange width T'. Based on the pre-input billet cross-sectional data, the dimensions of H and T' are obtained, and the distance from the center of the web to the center of the flange is calculated. From the center point of the web, the distance is shifted to both sides by (H-T') / 2 to locate the center position of each flange, and this point is marked as the preset flange center temperature monitoring point to continuously track temperature changes.

5. The method for continuous monitoring of surface temperature distribution in continuous casting of irregularly shaped billets according to claim 1 or 4, characterized in that: It also includes S7, which sets the temperature change range for each point and triggers an alarm when the temperature of a point is consistently higher or lower than this range.

6. A system for continuous monitoring of surface temperature distribution in continuous casting of irregularly shaped billets, characterized in that: The system is equipped with a signal acquisition device for measuring the surface temperature of the billet, and a data processor connected to the signal acquisition device for analyzing, processing and recording data. The signal acquisition device is installed above the continuous casting production line of irregular billets and collects images of the surface temperature of the continuously cast irregular billets downwards. The system executes the method for continuous monitoring of the surface temperature distribution of the continuously cast irregular billets as described in any of claims 1-5.

7. The system for continuous monitoring of surface temperature distribution in continuous casting of irregularly shaped billets according to claim 6, characterized in that: The signal acquisition device is an infrared thermal imager, and the data processor is a computer.

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