System and method for measuring solidification temperature of molten steel of continuous casting tundish at low cost

Abstract

The invention relates to a system for measuring the solidification temperature of molten steel of a continuous casting tundish at low cost. The measuring system comprises an s7-200smart host, a display screen, an analog quantity output module, a temperature measuring module, a relay, a tricolor lamp, an audible and visual alarm and a direct-current power supply, an external 220VAC power supply is connected to the DC power supply, the DC power supply outputs 24VDC to supply power to the s7-200smart host, the display screen, the analog quantity output module and the temperature measurement module, the s7-200smart host is connected with the temperature measurement module through a Siemens 200 series PLC module special line, and the analog quantity output module is connected with the temperature measurement module through a Siemens 200 series PLC module special line; the system is simple in structure, low in cost, capable of meeting actual on-site requirements in function and particularly suitable for the technological process with the large difference between the actual solidification temperature of the continuous casting tundish molten steel and the theoretical calculation solidification temperature.

Description

Technical Field

[0001] The invention relates to a measuring system, in particular to a low-cost measuring system and method for realizing the solidification temperature of molten steel in a continuous casting tundish, and belongs to the technical field of measuring the solidification temperature of molten steel in a continuous casting tundish. Background Art

[0002] With the continuous improvement of production technology, the types of steel smelted by steel mills are increasing, and the parameter control of the continuous casting pouring process is becoming more and more complex and demanding. In the continuous casting molten steel pouring process, the solidification temperature of the molten steel is a very important parameter. Generally speaking, in the metallurgical industry at home and abroad, the solidification temperature of the molten steel in the continuous casting tundish is estimated by the composition of the molten steel through a specific model, and then the superheat of the molten steel is reasonably controlled through the solidification temperature value (superheat is the actual temperature of the molten steel minus the solidification temperature of the molten steel). If the superheat is controlled too high, the cost of molten steel smelting will increase, and the probability of steel leakage during the molten steel pouring process will increase. If the superheat is controlled too low, the problem of cold steel blocking is likely to occur during the molten steel pouring process, resulting in the inability to pour the molten steel normally.

[0003] In the actual production process, there will be a problem that the theoretical calculated value of the molten steel solidification temperature deviates too much from the actual solidification temperature, which brings inconvenience to the production organization. In particular, the actual solidification temperature of high carbon steel deviates greatly from the theoretical calculated value. When producing this type of steel, the actual superheat control is high, and the production cost of this type of steel is high. If the solidification temperature of the molten steel in the tundish can be measured in time and the deviation from the theoretical calculated value (molten steel solidification temperature) can be corrected, it will be of great practical significance for reducing the superheat control of the molten steel. At present, there is no instrument specifically used for measuring the solidification temperature of the molten steel in the continuous casting tundish. If a special instrument for the auxiliary gun of the converter process is used, the temperature measuring host is expensive and the investment is large. Moreover, the temperature measuring instruments currently used do not have the problem of evaluating the accuracy of the temperature measurement results. Once the measurement results are wrong (and not discovered in time), it is easy to cause greater losses. Therefore, there is an urgent need for a new solution to solve the above technical problems. Summary of the invention

[0004] The present invention is aimed at the problems existing in the prior art, and provides a low-cost measurement system for the solidification temperature of molten steel in a continuous casting tundish. The technical solution is mainly used to measure the solidification temperature of molten steel in a continuous casting tundish, and can timely find the difference between the actual solidification temperature of molten steel in the continuous casting tundish and the theoretically calculated solidification temperature. Especially for high-carbon steel, the actual solidification temperature of molten steel in the tundish differs greatly from the theoretically calculated solidification temperature, and the measurement of the solidification temperature of molten steel in the tundish has greater reference value. The system has a simple structure, low cost, and functions that can meet actual needs on site, and is particularly suitable for process processes in which the actual solidification temperature of molten steel in the continuous casting tundish differs greatly from the theoretically calculated solidification temperature.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a low-cost measurement system for the solidification temperature of molten steel in a continuous casting tundish, characterized in that the measurement system comprises an s7-200smart host (7), a display screen (8), an analog output module (9), a temperature measurement module (10), a relay (11), a three-color lamp (12), an audible and visual alarm (13) and a DC power supply (14); an external 220VAC power supply is connected to the DC power supply (14), and the DC power supply (14) outputs 24VDC to respectively power the s7-200smart host (7), the display screen (8), the analog output module (9), and the temperature measurement module (10) (the modules are connected by wires). The s7-200smart host (7) and the temperature measurement module (10) are connected via a dedicated line for the Siemens 200 series PLC module, the analog output module (9) and the temperature measurement module (10) are connected via a dedicated line for the Siemens 200 series PLC module, the s7-200smart host (7) and the display screen (8) are connected via a network cable, the s7-200smart host (7) and the relay (11) are connected via wires, the relay (11) and the three-color light (12), the relay (11) and the sound and light alarm (13), the relay (11), the three-color light (12), the sound and light alarm (13) and an external 220VAC power supply are connected via wires.

[0006] As an improvement of the present invention, the analog output module (9) is provided with a molten pool temperature signal output (1), a molten pool temperature error signal output (2), a solidification temperature signal output (3), and a solidification temperature error signal output (4).

[0007] As an improvement of the present invention, the temperature measurement module (10) is provided with a molten pool temperature signal input (5) and a solidification temperature signal input (6).

[0008] A method for measuring the solidification temperature of molten steel in a continuous casting tundish at low cost, the method comprising the following steps:

[0009] Step 1: The PLC system constantly detects the temperature data of the temperature measuring probe, with a sampling period of 50ms. When the solidification temperature or the molten pool temperature is detected to be greater than 1000 degrees, the system starts to record the solidification temperature and the molten pool temperature data, and starts the timer T1 at the same time. When T1 is greater than 10 seconds (or the molten pool temperature and solidification temperature values ​​are calculated), the collection stops;

[0010] The molten pool temperature data is recorded as X[0], X[1]......X[n],

[0011] Solidification temperature data are recorded as Y[0], Y[1]...Y[n];

[0012] Step 2: Create a data sequence XX[6] and process the data according to the following logic;

[0013] a. Set the counting variable m = 0, XX[4] = 0, XX[5] = 10

[0014] b. Calculate the average value of the 20 melt pool temperatures X[m]...X[m+19] and store it in XX[0]. Find the maximum value of the 20 melt pool temperatures X[m]...X[m+19] and store it in XX[1]. Find the minimum value of the 20 melt pool temperatures X[m]...X[m+19] and store it in XX[2]. Calculate the difference between XX[1] and XX[0] and store it in XX[3].

[0015] c. If XX[0] is greater than 1450 degrees and XX[3] is less than XX[5], XX[4] equals XX[0] and XX[5] equals XX[3].

[0016] d. The counting variable m increases by 1. If m is greater than n-20, the data processing ends.

[0017] e. If XX[4] is greater than 1450 degrees and XX[5] is less than 1, the data processing ends. Otherwise, return to step b and recalculate. Step 3: Create data sequence YY[6] and process the data according to the following logic;

[0018] a. Set the counting variable m = 0, YY[4] = 0, YY[5] = 10

[0019] b. Calculate the average value of the 20 melt pool temperatures X[m]...X[m+19] and store it in YY[0]. Find the maximum value of the 20 melt pool temperatures Y[m]...Y[m+19] and store it in YY[1]. Find the minimum value of the 20 melt pool temperatures Y[m]...Y[m+19] and store it in YY[2]. Calculate the difference between YY[1] and YY[0] and store it in YY[3].

[0020] c. If YY[0] is greater than 1400 degrees and YY[3] is less than YY[5], YY[4] is equal to YY[0] and YY[5] is equal to YY[3].

[0021] d. The counting variable m increases by 1. If m is greater than n-20, the data processing ends.

[0022] e. If YY[4] is greater than 1400 degrees and YY[5] is less than 1, data processing ends. Otherwise, return to step b and recalculate.

[0023] Step 4: XX[4] is the final evaluation result of the molten pool temperature, XX[5] is the final calculation result of the molten pool temperature error. When XX[4] is greater than 1450 degrees and less than 1650 degrees, and XX[5] is less than 5 degrees, the data measurement result is valid and the corresponding 4-20mA signal is output. Otherwise, the data measurement result is invalid and a 4mA signal is output, indicating that the measurement result is invalid. YY[4] is the final evaluation result of the solidification temperature, and YY[5] is the final calculation result of the solidification temperature error. When YY[4] is greater than 1400 degrees and less than 1600 degrees, and YY[5] is less than 3 degrees, the data measurement result is valid and the corresponding 4-20mA signal is output. Otherwise, the data measurement result is invalid and a 4mA signal is output, indicating that the measurement result is invalid.

[0024] Step 5: The data processing described in step 2 and step 3 starts when the data collection exceeds 20, and is processed constantly as the collected data increases. When the measured results at both locations meet the requirements, a temperature measurement process end signal is issued, data collection is stopped, the red light of the three-color lamp is on, and an alarm sounds to indicate the end of the temperature measurement.

[0025] Step 6: Display the results.

[0026] As an improvement of the present invention, the step 2: establishing a data sequence XX[6], and processing the data according to the following logic;

[0027] a. Set the counting variable m = 0, XX[4] = 0, XX[5] = 10

[0028] b. Calculate the average value of the 20 melt pool temperatures X[m]...X[m+19] and store it in XX[0]. Find the maximum value of the 20 melt pool temperatures X[m]...X[m+19] and store it in XX[1]. Find the minimum value of the 20 melt pool temperatures X[m]...X[m+19] and store it in XX[2]. Calculate the difference between XX[1] and XX[0] and store it in XX[3].

[0029] c. If XX[0] is greater than 1450 degrees and XX[3] is less than XX[5], XX[4] equals XX[0] and XX[5] equals XX[3].

[0030] d. The counting variable m increases by 1. If m is greater than n-20, the data processing ends.

[0031] e. If XX[4] is greater than 1450 degrees and XX[5] is less than 1, data processing ends. Otherwise, return to step b and recalculate.

[0032] As an improvement of the present invention, step 3: establish a data sequence YY[6] and process the data according to the following logic.

[0033] a. Set the counting variable m = 0, YY[4] = 0, YY[5] = 10

[0034] b. Calculate the average value of the 20 melt pool temperatures X[m]...X[m+19] and store it in YY[0]. Find the maximum value of the 20 melt pool temperatures Y[m]...Y[m+19] and store it in YY[1]. Find the minimum value of the 20 melt pool temperatures Y[m]...Y[m+19] and store it in YY[2]. Calculate the difference between YY[1] and YY[0] and store it in YY[3].

[0035] c. If YY[0] is greater than 1400 degrees and YY[3] is less than YY[5], YY[4] is equal to YY[0] and YY[5] is equal to YY[3].

[0036] d. The counting variable m increases by 1. If m is greater than n-20, the data processing ends.

[0037] e. If YY[4] is greater than 1400 degrees and YY[5] is less than 1, data processing is completed, otherwise return to step b and recalculate.

[0038] Compared with the prior art, the present invention has the following advantages: 1. This technical solution has both the function of measuring the temperature of the original molten steel in the continuous casting tundish (i.e., the molten pool temperature) and the function of measuring the solidification temperature of the molten steel, that is, it can realize the measurement of the original single function (molten steel temperature), and can also realize the simultaneous measurement of the molten steel temperature and the solidification temperature without changing the host parameters; 2. The quality of the temperature measurement result is characterized by outputting the molten pool temperature deviation value and the solidification temperature deviation value. The smaller the deviation value, the higher the quality of the temperature measurement result and the higher the credibility. The larger the deviation value, the worse the quality of the temperature measurement result and the lower the credibility. This reminds the operator to pay special attention and needs to conduct supplementary measurement or take other processing methods. This is a function that other similar instruments do not have; 3. The solidification temperature of the molten steel in the continuous casting tundish can be measured at a low cost, and the cost is only one-tenth of the special instrument for the auxiliary gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is the connection diagram of the entire measurement system;

[0040] Figure 2 This is a schematic diagram of the entire logical flow of this method;

[0041] Figure 3 This is a schematic diagram of the logical processing process of step 2;

[0042] Figure 4 This is a schematic diagram of the logical processing process of step 3.

[0043] In the figure: 1. Molten pool temperature signal output, 2. Molten pool temperature error signal output, 3. Solidification temperature signal output, 4. Solidification temperature error signal output, 5. Molten pool temperature signal input, 6. Solidification temperature signal input, 7. s7-200smart host, 8. Display screen, 9. Analog output module, 10. Temperature measurement module, 11. Relay, 12. Three-color light, 13. Sound and light alarm, 14. DC power supply. DETAILED DESCRIPTION

[0044] In order to deepen the understanding of the present invention, the present embodiment is described in detail below with reference to the accompanying drawings.

[0045] Example 1: See Figure 1 A low-cost measurement system for the solidification temperature of molten steel in a continuous casting tundish, the measurement system comprising an s7-200smart host (7), a display screen (8), an analog output module (9), a temperature measurement module (10), a relay (11), a three-color lamp (12), an audible and visual alarm (13) and a direct current power supply (14); an external 220VAC power supply is connected to the direct current power supply (14), and the direct current power supply (14) outputs 24VDC to respectively power the s7-200smart host (7), the display screen (8), the analog output module (9), and the temperature measurement module (10) (the modules are connected by wires). The s7-200smart host (7) and the temperature measurement module (10) are connected via a dedicated line for the Siemens 200 series PLC module, the analog output module (9) and the temperature measurement module (10) are connected via a dedicated line for the Siemens 200 series PLC module, the s7-200smart host (7) and the display screen (8) are connected via a network cable, the s7-200smart host (7) and the relay (11) are connected via an electric wire, and the relay (11) and the three-color light (12) are connected via a network cable. The relay (11) and the sound and light alarm (13) are connected by wires, the relay (11), the three-color light (12), the sound and light alarm (13) and the external 220VAC power supply are connected by wires, the analog output module (9) is provided with a molten pool temperature signal output (1), a molten pool temperature error signal output (2), a solidification temperature signal output (3), and a solidification temperature error signal output (4), and the temperature measurement module (10) is provided with a molten pool temperature signal input (5) and a solidification temperature signal input (6).

[0046] Directions:

[0047] 1. Use a standard carbon temperature measuring gun, which can measure the molten pool temperature and solidification temperature at the same time. The gun has 4 signal line outputs (molten pool temperature, solidification temperature), which are connected to the molten pool signal input channel and solidification temperature signal input channel of the system. If the signal length is not long enough, S-type thermocouple compensation wire must be used according to the specification.

[0048] 2. When the temperature measuring probe is installed on the carbon setting gun, the three-color light shows green, indicating that the temperature measurement is "ready". When the probe is inserted into the molten steel for temperature measurement, and the system detects that the molten steel temperature is higher than 1000 degrees, the three-color light shows yellow, indicating that the temperature measurement is "in progress". When the system accurately measures the molten pool temperature and solidification temperature (or when the timing exceeds 10 seconds from the yellow light), the three-color light shows "red", indicating that the temperature measurement is over.

[0049] 3. After the temperature measurement is completed, the display screen will show the temperature change curve of the molten pool and the solidification temperature change curve, and a "rectangle" mark will be made in the curve value interval, indicating that the average temperature of the interval is used as the measurement result of this time, and the difference between the maximum and minimum temperature of the interval is used as the maximum temperature error of this measurement (this value is used to evaluate the quality of this temperature measurement). And all are output as 4-20mA signals. If the temperature measurement process fails, the screen will only display the temperature measurement curve, not the temperature measurement result data, and the signal output channel will output 4mA.

[0050] Example 2: See Figure 1-Figure 4 A method for measuring the solidification temperature of molten steel in a continuous casting tundish at low cost is disclosed, the method comprising the following steps:

[0051] Step 1: The PLC system constantly detects the temperature data of the temperature measuring probe, with a sampling period of 50ms. When the solidification temperature or the molten pool temperature is detected to be greater than 1000 degrees, the system starts to record the solidification temperature and the molten pool temperature data, and starts the timer T1 at the same time. When T1 is greater than 10 seconds (or the molten pool temperature and solidification temperature values ​​are calculated), the collection stops;

[0052] The molten pool temperature data is recorded as X[0], X[1]......X[n],

[0053] Solidification temperature data are recorded as Y[0], Y[1]...Y[n];

[0054] Step 2: Create a data sequence XX[6] and process the data according to the following logic;

[0055] a. Set the counting variable m = 0, XX[4] = 0, XX[5] = 10;

[0056] b. Calculate the average value of the 20 melt pool temperatures X[m]...X[m+19] and store it in XX[0]. Find the maximum value of the 20 melt pool temperatures X[m]...X[m+19] and store it in XX[1]. Find the minimum value of the 20 melt pool temperatures X[m]...X[m+19] and store it in XX[2]. Calculate the difference between XX[1] and XX[0] and store it in XX[3].

[0057] c. If XX[0] is greater than 1450 degrees and XX[3] is less than XX[5], XX[4] equals XX[0] and XX[5] equals XX[3].

[0058] d. The counting variable m increases by 1. If m is greater than n-20, the data processing ends.

[0059] e. If XX[4] is greater than 1450 degrees and XX[5] is less than 1, the data processing ends. Otherwise, return to step b and recalculate. Step 3: Create data sequence YY[6] and process the data according to the following logic;

[0060] a. Set the counting variable m = 0, YY[4] = 0, YY[5] = 10

[0061] b. Calculate the average value of the 20 melt pool temperatures X[m]...X[m+19] and store it in YY[0]. Find the maximum value of the 20 melt pool temperatures Y[m]...Y[m+19] and store it in YY[1]. Find the minimum value of the 20 melt pool temperatures Y[m]...Y[m+19] and store it in YY[2]. Calculate the difference between YY[1] and YY[0] and store it in YY[3].

[0062] c. If YY[0] is greater than 1400 degrees and YY[3] is less than YY[5], YY[4] is equal to YY[0] and YY[5] is equal to YY[3].

[0063] d. The counting variable m increases by 1. If m is greater than n-20, the data processing ends.

[0064] e. If YY[4] is greater than 1400 degrees and YY[5] is less than 1, data processing ends. Otherwise, return to step b and recalculate.

[0065] Step 4: XX[4] is the final evaluation result of the molten pool temperature, XX[5] is the final calculation result of the molten pool temperature error. When XX[4] is greater than 1450 degrees and less than 1650 degrees, and XX[5] is less than 5 degrees, the data measurement result is valid and the corresponding 4-20mA signal is output. Otherwise, the data measurement result is invalid and a 4mA signal is output, indicating that the measurement result is invalid. YY[4] is the final evaluation result of the solidification temperature, and YY[5] is the final calculation result of the solidification temperature error. When YY[4] is greater than 1400 degrees and less than 1600 degrees, and YY[5] is less than 3 degrees, the data measurement result is valid and the corresponding 4-20mA signal is output. Otherwise, the data measurement result is invalid and a 4mA signal is output, indicating that the measurement result is invalid.

[0066] Step 5: The data processing described in step 2 and step 3 starts when the data collection exceeds 20, and is processed constantly as the collected data increases. When the measured results at both locations meet the requirements, a temperature measurement process end signal is issued, data collection is stopped, the red light of the three-color lamp is on, and an alarm sounds to indicate the end of the temperature measurement.

[0067] Step 6: Display the results. The display screen will draw the melt pool temperature and solidification temperature curves according to the data described in a. The vertical axis represents the temperature value and the horizontal axis represents the time (the start of data sampling is recorded as 0, and each sampling point is 50ms apart). The melt pool temperature, solidification temperature, melt pool temperature deviation, and solidification temperature deviation are displayed in large fonts in the upper right corner of the screen (*** is displayed if the data evaluation fails). The screen content and signal output remain until the next temperature measurement process begins.

[0068] Step 2: Establish data sequence XX[6] and process the data according to the following logic;

[0069] a. Set the counting variable m = 0, XX[4] = 0, XX[5] = 10

[0070] b. Calculate the average value of the 20 melt pool temperatures X[m]...X[m+19] and store it in XX[0]. Find the maximum value of the 20 melt pool temperatures X[m]...X[m+19] and store it in XX[1]. Find the minimum value of the 20 melt pool temperatures X[m]...X[m+19] and store it in XX[2]. Calculate the difference between XX[1] and XX[0] and store it in XX[3].

[0071] c. If XX[0] is greater than 1450 degrees and XX[3] is less than XX[5], XX[4] equals XX[0] and XX[5] equals XX[3].

[0072] d. The counting variable m increases by 1. If m is greater than n-20, the data processing ends.

[0073] e. If XX[4] is greater than 1450 degrees and XX[5] is less than 1, the data processing is finished. Otherwise, return to step b and recalculate. Step 3: Create data sequence YY[6] and process the data according to the following logic.

[0074] a. Set the counting variable m = 0, YY[4] = 0, YY[5] = 10

[0075] b. Calculate the average value of the 20 melt pool temperatures X[m]...X[m+19] and store it in YY[0]. Find the maximum value of the 20 melt pool temperatures Y[m]...Y[m+19] and store it in YY[1]. Find the minimum value of the 20 melt pool temperatures Y[m]...Y[m+19] and store it in YY[2]. Calculate the difference between YY[1] and YY[0] and store it in YY[3].

[0076] c. If YY[0] is greater than 1400 degrees and YY[3] is less than YY[5], YY[4] is equal to YY[0] and YY[5] is equal to YY[3].

[0077] d. The counting variable m increases by 1. If m is greater than n-20, the data processing ends.

[0078] e. If YY[4] is greater than 1400 degrees and YY[5] is less than 1, data processing ends. Otherwise, return to step b and recalculate.

[0079] It should be noted that the above embodiments are not intended to limit the protection scope of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions all fall within the protection scope of the claims of the present invention.

Claims

1. A low-cost measurement system for the solidification temperature of molten steel in the continuous casting tundish. It is characterized in that The measuring system comprises a s7-200smart host (7), a display screen (8), an analog output module (9), a temperature measuring module (10), a relay (11), a tricolor lamp (12), an audible and visual alarm (13) and a direct current power supply (14); an external 220VAC power supply is connected to the direct current power supply (14), and the direct current power supply (14) outputs 24VDC to respectively supply power to the s7-200smart host (7), the display screen (8), the analog output module (9) and the temperature measuring module (10); the s7-200smart host (7) and the temperature measuring module (10) are connected via a Siemens 2 00 series PLC module dedicated line, the analog output module (9) and the temperature measurement module (10) are connected through the Siemens 200 series PLC module dedicated line, the s7-200smart host (7) and the display screen (8) are connected through a network cable, the s7-200smart host (7) and the relay (11) are connected through wires, the relay (11) and the three-color light (12), the relay (11) and the sound and light alarm (13), the relay (11), the three-color light (12), the sound and light alarm (13) and the external 220VAC power supply are connected through wires.

2. The low-cost measurement system for the solidification temperature of molten steel in the continuous casting tundish according to claim 1, It is characterized in that The analog output module (9) is provided with a molten pool temperature signal output (1), a molten pool temperature error signal output (2), Solidification temperature signal output (3), solidification temperature error signal output (4).

3. The low-cost measurement system for the solidification temperature of molten steel in the continuous casting tundish according to claim 2, It is characterized in that The temperature measurement module (10) is provided with a molten pool temperature signal input (5) and a solidification temperature signal input (6).

4. A low-cost method for measuring the solidification temperature of molten steel in the continuous casting tundish. It is characterized in that The low-cost measurement system for the solidification temperature of molten steel in the continuous casting tundish according to any one of claims 1 to 3 is used, and the method comprises the following steps: Step 1: The PLC system constantly detects the temperature data of the temperature measuring probe, with a sampling period of 50ms. When the solidification temperature or the molten pool temperature is detected to be greater than 1000 degrees, the system starts to record the solidification temperature and the molten pool temperature data, and starts the timer T1 at the same time. When T1 is greater than 10 seconds (or the molten pool temperature and solidification temperature values ​​are calculated), the collection stops; The molten pool temperature data is recorded as X[0], X[1]......X[n], Solidification temperature data are recorded as Y[0], Y[1]...Y[n]; Step 2: Create a data sequence XX[6] and process the data according to the following logic; a. Set the counting variable m = 0, XX[4] = 0, XX[5] = 10; b. Calculate the average value of the 20 melt pool temperatures from X[m]...X[m+19] and store it in XX[0]. Find the maximum value of the 20 melt pool temperatures from X[m]...X[m+19] and store it in XX[1]. Find the minimum value of the 20 melt pool temperatures from X[m]...X[m+19] and store it in XX[2]. Calculate the difference between XX[1] and XX[0] and store it in XX[3]. c. If XX[0] is greater than 1450 degrees and XX[3] is less than XX[5], XX[4] is equal to XX[0], XX[5] is equal to XX[3], d. The counting variable m increases by 1. If m is greater than n-20, the data processing ends; e. If XX[4] is greater than 1450 degrees and XX[5] is less than 1, data processing is completed. Otherwise, return to step b and recalculate. Step 3: Create data sequence YY[6] and process the data according to the following logic; a. Set the counting variable m = 0, YY[4] = 0, YY[5] = 10 b. Calculate the average value of the 20 melt pool temperatures from X[m]...X[m+19] and store it in YY[0]. Find the maximum value of the 20 melt pool temperatures from Y[m]...Y[m+19] and store it in YY[1]. Find the minimum value of the 20 melt pool temperatures from Y[m]...Y[m+19] and store it in YY[2]. Calculate the difference between YY[1] and YY[0] and store it in YY[3]. c. If YY[0] is greater than 1400 degrees and YY[3] is less than YY[5], YY[4] is equal to YY[0], YY[5] is equal to YY[3], d. The counting variable m increases by 1. If m is greater than n-20, the data processing ends; e. If YY[4] is greater than 1400 degrees and YY[5] is less than 1, data processing is completed, otherwise return to step b and recalculate. Step 4: XX[4] is the final evaluation result of the molten pool temperature, and XX[5] is the final calculation result of the molten pool temperature error. When XX[4] is greater than 1450 degrees and less than 1650 degrees, and XX[5] is less than 5 degrees, the data measurement result is valid and the corresponding 4-20mA signal is output. Otherwise, the data measurement result is invalid and a 4mA signal is output, indicating that the measurement result is invalid. YY[4] is the final evaluation result of the solidification temperature, and YY[5] is the final calculation result of the solidification temperature error. When YY[4] is greater than 1400 degrees and less than 1600 degrees, and YY[5] is less than 3 degrees, the data measurement result is valid and the corresponding 4-20mA signal is output. Otherwise, the data measurement result is invalid and a 4mA signal is output, indicating that the measurement result is invalid. Step 5: The data processing described in step 2 and step 3 starts when the data collection exceeds 20, and is processed constantly as the collected data increases. When the measured results at both locations meet the requirements, a temperature measurement process end signal is issued, data collection is stopped, the three-color light turns red, and an alarm sounds to indicate the end of temperature measurement; Step 6: Display the results.

5. A low-cost method for measuring the solidification temperature of molten steel in the continuous casting tundish. It is characterized in that Step 2: Establish data sequence XX[6] and process the data according to the following logic; a. Set the counting variable m = 0, XX[4] = 0, XX[5] = 10; b. Calculate the average value of the 20 melt pool temperatures from X[m]...X[m+19] and store it in XX[0]. Find the maximum value of the 20 melt pool temperatures from X[m]...X[m+19] and store it in XX[1]. Find the minimum value of the 20 melt pool temperatures from X[m]...X[m+19] and store it in XX[2]. Calculate the difference between XX[1] and XX[0] and store it in XX[3]. c. If XX[0] is greater than 1450 degrees and XX[3] is less than XX[5], XX[4] is equal to XX[0], XX[5] is equal to XX[3], d. The counting variable m increases by 1. If m is greater than n-20, the data processing ends; e. If XX[4] is greater than 1450 degrees and XX[5] is less than 1, data processing is completed, otherwise return to step b and recalculate.

6. A low-cost method for measuring the solidification temperature of molten steel in the continuous casting tundish. It is characterized in that Step 3: Create a data sequence YY[6] and process the data according to the following logic; a. Set the counting variable m = 0, YY[4] = 0, YY[5] = 10; b. Calculate the average value of the 20 melt pool temperatures from X[m]...X[m+19] and store it in YY[0]. Find the maximum value of the 20 melt pool temperatures from Y[m]...Y[m+19] and store it in YY[1]. Find the minimum value of the 20 melt pool temperatures from Y[m]...Y[m+19] and store it in YY[2]. Calculate the difference between YY[1] and YY[0] and store it in YY[3]. c. If YY[0] is greater than 1400 degrees and YY[3] is less than YY[5], YY[4] is equal to YY[0], YY[5] is equal to YY[3], d. The counting variable m increases by 1. If m is greater than n-20, the data processing ends; e. If YY[4] is greater than 1400 degrees and YY[5] is less than 1, data processing is completed, otherwise return to step b and recalculate.

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