Method and system for continuously monitoring continuous casting surface temperature distribution of special-shaped blank

Abstract

The invention discloses a method for continuously monitoring continuous casting surface temperature distribution of a special-shaped blank. The method comprises the following steps: S1, setting a monitoring point; s2, after pouring is started, when the continuous casting special-shaped blank enters the detection range of a signal collector, the surface temperature of the casting blank begins to be measured; s3, automatically calibrating the position of the R angle; s4, automatically calibrating the middle of the web; s5, calibrating the middle position of the wing top; and S6, according to the roughly set temperature and the calculation result. The internal temperature of the special-shaped blank can be monitored, the temperature change of the inner arc can be tracked in real time, the condition in the secondary cooling chamber can be monitored in real time, and production interruption or quality abnormity caused by rapid temperature change of the casting blank due to equipment and process abnormity is avoided.

Description

Technical Field

[0001] The invention relates to the field of continuous casting of profiled blanks. Background Art

[0002] In the continuous casting production process, the cooling system is one of the key systems that affects the smoothness of continuous casting and the quality of the ingot. It also provides process support for the continuous casting speed system, light (heavy) pressure reduction, electromagnetic stirring and other technologies. It is also the process basis to ensure that the ingot does not have quality defects such as "bulging", "depression", "corner cracks", etc. The surface temperature of the ingot is a direct reflection of the secondary cooling condition. Therefore, measuring and monitoring the surface temperature of the ingot in the secondary cooling chamber can quickly and directly evaluate the cooling condition of the continuous casting machine, and timely discover problems in the cooling system through temperature fluctuations, providing technical support for the rapid evaluation of the surface quality and internal quality of the ingot and the rapid discovery and resolution of problems in the production process.

[0003] In the measurement of the surface temperature of the ingot, continuous monitoring is a common technical means to measure the surface temperature of the ingot. However, unlike regular ingots such as slabs and square billets, the temperature of the entire section of the shaped billet is highly non-uniform, and the temperature difference of the section is large. It is necessary to track 5 monitoring points in three parts: R angle, middle of the web, and top of the flange. In addition, most shaped billets are produced by a single casting machine with multiple sections. How to quickly and intelligently determine the position of each key monitoring point after switching between different sections and adjust and monitor in time is another difficulty in monitoring the surface temperature of the shaped billet. Therefore, according to the characteristics of the cross-sectional shape of the shaped billet, the development of the surface temperature monitoring technology of the shaped billet is of great significance to improving the surface and internal quality of the shaped billet and improving the stable and smooth production of the continuous casting of the shaped billet.

[0004] For example, the public document with the announcement number CN114088213A and the patent name "A non-contact temperature measuring device and temperature measuring method for the surface of a continuous casting billet" discloses a non-contact temperature measuring device and temperature measuring method, which measures the surface temperature of the billet in the fan-shaped segment by an infrared temperature measuring probe, but it is a single-point measurement and does not have the function of measuring the temperature distribution on the billet surface, 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 the billet in the secondary cooling zone of the continuous casting of special-shaped billets. Summary of the invention

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

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: a method for continuously monitoring the surface temperature distribution of a profiled blank during continuous casting, comprising the following steps:

[0008] S1. Monitoring point setting;

[0009] S2. After the pouring starts, when the continuous casting profiled billet enters the detection range of the signal collector, the billet surface temperature is measured;

[0010] Automatic calibration of S3 and R angular position;

[0011] S4, automatic calibration of the middle of the web;

[0012] S5, wing top middle position calibration;

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

[0014] The S1 includes:

[0015] Step 1: Select a rough test line according to the cross section of the continuous casting profiled billet;

[0016] Step 2, determine the R angle position according to the maximum temperature;

[0017] Step 3: Calculate the center position of the plate belly according to the R angle position;

[0018] Step 4: Calculate the center position of the flange according to the center of the web;

[0019] Step 5: Determine the five-point positions and start continuous monitoring.

[0020] Method for selecting rough test line:

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

[0022] Step 2: The two detection lines are not connected at the web;

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

[0024] In S3, based on the detected surface temperature distribution of the continuous casting special-shaped billet, the temperature data on the initial detection line is analyzed, and based on the characteristics of the surface temperature distribution of the special-shaped billet, the positions of the two highest temperature points are judged to be the two R corner positions of the billet, and these two points are set as continuous tracking points to track the temperature changes of the R corner positions.

[0025] In S4, according to the two calibrated R angle monitoring points, the two points are connected to obtain the middle point, and this position is set as the web center temperature tracking point to continuously track the temperature change.

[0026] In S5, the cross-section of the continuously cast special-shaped billet is H-shaped, and the data processor enters the billet cross-sectional data, including the billet outer width H and the flange width T'. The H dimension and the T' dimension are obtained based on the pre-entered billet cross-sectional data, and the distance from the center of the web to the center of the wing top is calculated. From the center point of the web, the distance of (H-T') / 2 is translated to both sides to locate the center position of each flange, and this point is marked as the preset wing top center temperature monitoring point to continuously track temperature changes.

[0027] In S6, the setting of the monitoring points is completed, and the signal collector starts to continuously monitor the temperature monitoring points of the web center, R angle, and flange top, and tracks the temperatures 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. When the temperature of a certain point is continuously higher or lower than this range, an alarm is issued.

[0029] A system for continuously monitoring the surface temperature distribution of special-shaped billets during continuous casting. The system is provided with a signal collector for measuring the surface temperature of the billets, and a data processor connected to the signal collector for analyzing, processing and recording data. The signal collector is installed above the special-shaped billet continuous casting production line and collects temperature images of the upper surface of the continuously cast special-shaped billets downward.

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

[0031] The present invention can monitor the internal temperature of the special-shaped billet, track the change of the inner arc temperature in real time, and monitor the condition in the secondary cooling chamber in real time, so as to avoid the production interruption or quality abnormality caused by the sudden change of the billet temperature due to the abnormal equipment and process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The following is a brief description of the contents expressed in each figure in the specification of the present invention and the marks in the figure:

[0033] Figure 1 The schematic diagram of the system is shown in FIG.

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

[0035] Figure 3 Set up processes for key monitoring points of profiled blanks;

[0036] Figure 4 This is a schematic diagram of R angle position calibration;

[0037] Figure 5 This is a schematic diagram for calibrating the middle position of the web;

[0038] Figure 6 This is a schematic diagram for calibrating the position of the flange top;

[0039] Figure 7 It is a schematic diagram of the shape dimensions and key temperature monitoring points of the profiled blank;

[0040] Figure 8 It is a schematic diagram of the temperature distribution characteristics of the cross section of the profiled blank;

[0041] Fig. 9 It is a temperature schematic diagram of the temperature monitoring points of the cross-section of the profiled blank;

[0042] Fig.10 This is an example of surface temperature monitoring of a special-shaped billet (section specification: 1300×510×140mm);

[0043] Fig.11 To adjust the temperature change of the north wing top in front and back (section specification: 1300×510×140mm);

[0044] The marks in the above figures are: 1. Data processor; 2. Signal collector; 3. Rough detection line; 4. Highest temperature point; 5. Middle of web; 6. R angle monitoring point; 7. Middle of flange. DETAILED DESCRIPTION

[0045] The following is a further detailed description of the specific implementation methods of the present invention, such as the shape, structure, relative position and connection relationship between the various components involved, the function and working principle of each part, the manufacturing process and operation method, etc., through the description of the embodiments with reference to the accompanying drawings, so as 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 beam blanks is suitable for monitoring the surface temperature of beam blanks in continuous casting, such as Figure 1 As shown, the system includes a signal collector for measuring the surface temperature of the ingot, and a data processor for analyzing, processing and recording data. The signal collector generally adopts an infrared thermal imager, and the data processor generally adopts a computer. The signal collector collection point is located directly above the special-shaped billet, and the detection range is larger than the special-shaped billet with the largest cross-section.

[0047] The above system uses a thermal imager for temperature monitoring, utilizes the temperature distribution characteristics of the shaped blank, and uses computer-aided calculation to achieve rapid and continuous monitoring of the surface temperature of the shaped blank, such as Figure 7 As shown in the figure, an example of temperature monitoring of a special-shaped billet using the present invention was used. Through temperature monitoring, it was found that the temperature of 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 of the wing top. After the north side was adjusted to eliminate the overcooling of the flange, the surface temperature of the billet recovered significantly.

[0048] The cross-sectional data of the ingot is entered into the computer, including the dimensions of two key parts: the outer width (H) and the flange width (T'). These data need to be entered in advance and replaced during production according to the inspected products. During operation, the computer sets the detection line thickness within the detection range based on the cross-sectional dimension data of the ingot.

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

[0050] 1) Set the inspection line to be divided into two parts, covering two R corners and part of the flange and web respectively;

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

[0052] 3) The two detection lines are on the same line, perpendicular to the throwing direction.

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

[0054] S1 Monitoring point setting process. Since the profiled billet casting machine has many sections, the sections need to be changed frequently. The position deviation of different sections is very large, and the position of the billet will be slightly offset after each section change. Therefore, the monitoring point needs to be quickly set before each monitoring. The setting is automatically completed by the data processor. The process is shown in Figure 3 , including the following steps:

[0055] Step 1: Select a rough test line according to the cross section of the continuous casting profiled billet;

[0056] Step 2, determine the R angle position according to the maximum temperature;

[0057] Step 3: Calculate the center position of the plate belly according to the R angle position;

[0058] Step 4: Calculate the center position of the flange according to the center of the web;

[0059] Step 5: Determine the five-point positions and start continuous monitoring.

[0060] After S2 pouring starts, when the hot billet enters the detection range of the signal collector, the billet surface temperature is measured;

[0061] Automatic calibration of S3 R angular position: The computer analyzes the temperature data on the initial detection line according to the surface temperature distribution of the billet detected by the signal collector, and calculates the temperature distribution of the billet according to the characteristics of the surface temperature distribution of the billet (see Figure 7 ), it can be determined that the positions of the two highest temperature points are the two R corner positions of the billet, and these two points are set as continuous tracking points to track the temperature changes of the R corner positions;

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

[0063] S5 Wing top middle position calibration: According to the current ingot cross-sectional dimension data entered into the computer, the distance from the center of the web to the center of the wing top is calculated with the dimensions of H and T'. From the center point of the web, the distance to the left (right) is (H-T') / 2. This position is the center position of the two flanges, and this point is marked as the preset wing top center temperature monitoring point to continuously track the temperature changes;

[0064] S6 Based on the rough temperature and calculation results, the computer sets the monitoring points, and the signal collector starts to continuously monitor the temperature monitoring points of the web center, R angle, and flange top, and tracks the temperatures of the five points in real time to form a temperature tracking curve;

[0065] S7 can set the temperature change range for each point. When the temperature of a certain point is continuously higher or lower than this range, the computer can issue a temperature abnormality alarm to remind that there is a problem with the cooling at that location.

[0066] The above method for monitoring the surface temperature of the profiled blank realizes the surface temperature distribution analysis of the profiled blank and the real-time temperature monitoring of key positions such as the web, R angle, and flange top, and judges and predicts the equipment status and quality of the profiled blank.

[0067] Specifically, it has the following advantages:

[0068] (1) Analyze the monitoring points and positions according to the cross-sectional shape and cooling characteristics of the profiled blank, and monitor the changes in the surface temperature of the profiled blank in real time;

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

[0070] (3) It can realize real-time analysis of the surface temperature distribution of the profiled blank and continuous monitoring of the temperature changes of key detection points over time;

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

[0072] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A method for continuously monitoring the surface temperature distribution of a beam blank during continuous casting, characterized in that: The following steps are involved: S1. Monitoring point setting; S2. After the pouring starts, when the continuous casting profiled billet enters the detection range of the signal collector, the billet surface temperature is measured; Automatic calibration of S3 and R angular position; S4, automatic calibration of the middle of the web; S5, wing top middle position calibration; S6. Based on the rough temperature and calculation results.

2. The method for continuous monitoring of surface temperature distribution of beam blank continuous casting according to claim 1, characterized in that: The S1 includes: Step 1: Select a rough test line according to the cross section of the continuous casting profiled billet; Step 2, determine the R angle position according to the maximum temperature; Step 3: Calculate the center position of the plate belly according to the R angle position; Step 4: Calculate the center position of the flange according to the center of the web; Step 5: Determine the five-point positions and start continuous monitoring.

3. The method for continuous monitoring of surface temperature distribution of beam blank continuous casting according to claim 2, characterized in that: Method for selecting rough test line: Step 1: Set the inspection line to be divided into two parts, covering the two R corners, flange and web respectively; Step 2: The two detection lines are not connected at the web; Step 3: The two detection lines are on the same line, perpendicular to the throwing direction.

4. The method for continuously monitoring the surface temperature distribution of the beam blank continuous casting according to claim 1, 2 or 3, characterized in that: In S3, based on the detected surface temperature distribution of the continuous casting special-shaped billet, the temperature data on the initial detection line is analyzed, and based on the characteristics of the surface temperature distribution of the special-shaped billet, the positions of the two highest temperature points are judged to be the two R corner positions of the billet, and these two points are set as continuous tracking points to track the temperature changes of the R corner positions.

5. The method for continuous monitoring of surface temperature distribution of beam blank continuous casting according to claim 4, characterized in that: In S4, according to the two calibrated R angle monitoring points, the two points are connected to obtain the middle point, and this position is set as the web center temperature tracking point to continuously track the temperature change.

6. The method for continuous monitoring of surface temperature distribution of beam blank continuous casting according to claim 5, characterized in that: In S5, the cross-section of the continuously cast special-shaped billet is H-shaped, and the data processor enters the billet cross-sectional data, including the billet outer width H and the flange width T'. The H dimension and the T' dimension are obtained based on the pre-entered billet cross-sectional data, and the distance from the center of the web to the center of the wing top is calculated. From the center point of the web, the distance of (H-T') / 2 is translated to both sides to locate the center position of each flange, and this point is marked as the preset wing top center temperature monitoring point to continuously track temperature changes.

7. The method for continuous monitoring of surface temperature distribution of beam blank continuous casting according to claim 6, characterized in that: In S6, the setting of the monitoring points is completed, and the signal collector starts to continuously monitor the temperature monitoring points of the web center, R angle, and flange top, and tracks the temperatures of the five points in real time to form a temperature tracking curve.

8. The method for continuous monitoring of surface temperature distribution of beam blank continuous casting according to claim 1 or 7, characterized in that: It also includes S7, which sets the temperature change range for each point. When the temperature of a certain point is continuously higher or lower than this range, an alarm is issued.

9. A system for continuous monitoring of surface temperature distribution of profiled blanks, characterized in that: The system is provided with a signal collector for measuring the surface temperature of the ingot, and a data processor connected to the signal collector for analyzing, processing and recording data. The signal collector is installed above the special-shaped billet continuous casting production line to collect temperature images of the upper surface of the continuous casting special-shaped billet.

10. The system for continuous monitoring of surface temperature distribution of beam blank continuous casting according to claim 9, characterized in that: The signal collector is an infrared thermal imager, and the data processor is a computer.

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