A low-cost measurement system and method for measuring the solidification temperature of molten steel in a continuous casting tundish

Abstract

This invention relates to a low-cost measurement system for the solidification temperature of molten steel in a continuous casting tundish. The system includes an S7-200Smart main unit, a display screen, an analog output module, a temperature measurement module, a relay, a tri-color indicator, an audible and visual alarm, and a DC power supply. An external 220VAC power supply is connected to the DC power supply, which outputs 24VDC to power the S7-200Smart main unit, the display screen, the analog output module, and the temperature measurement module. The S7-200Smart main unit and the temperature measurement module are connected via a dedicated cable from a Siemens 200 series PLC module, and the analog output module and the temperature measurement module are also connected via a dedicated cable from a Siemens 200 series PLC module. This system has a simple structure, low cost, and functions that meet actual field needs. It is particularly suitable for processes where the actual solidification temperature of molten steel in a continuous casting tundish differs significantly from the theoretically calculated solidification temperature.

Description

Technical Field

[0001] This invention relates to a measurement system, specifically a low-cost measurement system and method for measuring the solidification temperature of molten steel in a continuous casting tundish, belonging to the field of continuous casting tundish molten steel solidification temperature measurement technology. Background Technology

[0002] With the continuous improvement of production technology, the types of steel smelted in steel mills are constantly increasing, and the parameter control of the continuous casting process is becoming more and more complex and demanding. In the continuous casting process, the solidification temperature of molten steel is a crucial parameter. Generally, in the metallurgical industry both domestically and internationally, the solidification temperature of molten steel in the continuous casting tundish is estimated using a specific model based on the steel composition. Then, the superheat of the molten steel (the superheat is the actual temperature of the molten steel minus the solidification temperature) is rationally controlled based on the solidification temperature value. Excessive superheat increases steel smelting costs and the probability of steel leakage during casting. Insufficient superheat can easily lead to cold steel blockage during casting, preventing normal casting.

[0003] In actual production, a significant deviation between the theoretically calculated and actual solidification temperatures of molten steel can occur, causing inconvenience to production organization. This is particularly true for high-carbon steel, where the actual solidification temperature deviates considerably from the theoretical calculation, leading to higher actual superheat control and consequently higher production costs. Timely measurement of the molten steel solidification temperature in the tundish to correct this deviation is crucial for reducing superheat control. Currently, there are no dedicated instruments for measuring the solidification temperature of molten steel in continuous casting tundishes. Using instruments specifically designed for the auxiliary lance in the converter process presents the problem of high cost and significant investment. Furthermore, current temperature measuring instruments lack the capability to assess the accuracy of measurement results; errors (if not detected promptly) can easily lead to greater losses. Therefore, a new solution is urgently needed to address these technical problems. Summary of the Invention

[0004] This invention addresses the problems existing in the prior art by providing a low-cost system for measuring the solidification temperature of molten steel in continuous casting tundishes. This technical solution is primarily used to measure the solidification temperature of molten steel in continuous casting tundishes, enabling timely detection of the difference between the actual solidification temperature and the theoretically calculated solidification temperature. This is particularly important for high-carbon steel, where the difference between the actual and theoretically calculated solidification temperatures is significant, making the measurement of the molten steel's solidification temperature in the tundishes even more valuable. The system has a simple structure, low cost, and functionality that meets practical field needs, making it particularly suitable for processes where the actual solidification temperature of molten steel in continuous casting tundishes differs greatly from the theoretically calculated solidification temperature.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: a low-cost measurement system for measuring the solidification temperature of molten steel in a continuous casting tundish, characterized in that the measurement system includes an S7-200Smart host (7), a display screen (8), an analog output module (9), a temperature measurement module (10), a relay (11), a tri-color light (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 power the S7-200Smart host (7), the display screen (8), the analog output module (9), and the temperature measurement module (10) respectively (the modules are connected by wires). The S7-200Smart host (7) and the temperature measurement module (10) are connected via a dedicated Siemens 200 series PLC module cable. The analog output module (9) and the temperature measurement module (10) are connected via a dedicated Siemens 200 series PLC module cable. 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 a wire. The relay (11) is connected to the tri-color light (12), the relay (11) is connected to the audible and visual alarm (13), and the relay (11), the tri-color light (12), the audible and visual alarm (13) are connected to the external 220VAC power supply via wires.

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

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

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

[0009] Step 1: The PLC system continuously monitors the temperature data from the temperature probe with a sampling period of 50ms. When the solidification temperature or molten pool temperature is detected to be greater than 1000 degrees, the system starts recording the solidification temperature and molten pool temperature data and starts timer T1. When T1 is greater than 10 seconds (or when the molten pool temperature and solidification temperature values ​​are calculated), the data acquisition stops.

[0010] Molten pool temperature data are denoted as X[0], X[1]......X[n].

[0011] The solidification temperature data are denoted as Y[0], Y[1]......Y[n];

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

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

[0014] b. Calculate the average value of the 20 molten pool temperatures X[m]...X[m+19] and store it in XX[0]. Find the maximum value among the 20 molten pool temperatures X[m]...X[m+19] and store it in XX[1]. Find the minimum value among the 20 molten 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. Increment the counter variable m by 1. If m is greater than n-20, then 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: Establish the data sequence YY[6] and process the data according to the following logic;

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

[0019] b. Calculate the average value of the 20 molten pool temperatures X[m]...X[m+19] and store it in YY[0]. Find the maximum value among the 20 molten pool temperatures Y[m]...Y[m+19] and store it in YY[1]. Find the minimum value among the 20 molten 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. Increment the counter variable m by 1. If m is greater than n-20, then the data processing ends.

[0022] e. If YY[4] is greater than 1400 degrees and YY[5] is less than 1, the 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, 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.

[0024] Step 5: The data processing described in Steps 2 and 3 begins when more than 20 data points are collected, and continues as more data is collected. When the results measured at both locations meet the requirements, a signal indicating the end of the temperature measurement process is issued, data collection stops, the red light of the three-color indicator illuminates, 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, step 2: establish a data sequence XX[6] and process the data according to the following logic;

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

[0028] b. Calculate the average value of the 20 molten pool temperatures X[m]...X[m+19] and store it in XX[0]. Find the maximum value among the 20 molten pool temperatures X[m]...X[m+19] and store it in XX[1]. Find the minimum value among the 20 molten 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. Increment the counter variable m by 1. If m is greater than n-20, then the data processing ends.

[0031] 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.

[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. Let the counting variable m = 0, YY[4] = 0, YY[5] = 10

[0034] b. Calculate the average value of the 20 molten pool temperatures X[m]...X[m+19] and store it in YY[0]. Find the maximum value among the 20 molten pool temperatures Y[m]...Y[m+19] and store it in YY[1]. Find the minimum value among the 20 molten 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. Increment the counter variable m by 1. If m is greater than n-20, then the data processing ends.

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

[0038] Compared with existing technologies, this invention has the following advantages: 1. This technical solution combines the functions of measuring the temperature of molten steel (i.e., the molten pool temperature) in the tundish of continuous casting and measuring the solidification temperature of molten steel. It can achieve both the original single-function measurement (molten steel temperature) and the simultaneous measurement of molten steel temperature and solidification temperature without changing the host parameters; 2. The quality of the temperature measurement results is characterized by outputting the deviation values ​​of the molten pool temperature and the solidification temperature. The smaller the deviation value, the higher the quality and reliability of the temperature measurement result. The larger the deviation value, the worse the quality and reliability of the temperature measurement result. This reminds the operator to pay close attention and needs to perform supplementary measurements or take other measures. This is a function that other similar instruments do not have; 3. It achieves the measurement of the solidification temperature of molten steel in the tundish of continuous casting at a low cost, with a cost that is only one-tenth of that of a dedicated instrument for the secondary lance. Attached Figure Description

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

[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 logic processing in step 2;

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

[0043] In the diagram: 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 main unit, 8. Display screen, 9. Analog output module, 10. Temperature measurement module, 11. Relay, 12. Tri-color light, 13. Audible and visual alarm, 14. DC power supply. Detailed Implementation

[0044] To enhance understanding of the present invention, the embodiments will be described in detail below with reference to the accompanying drawings.

[0045] Example 1: See Figure 1 A low-cost measurement system for measuring the solidification temperature of molten steel in a continuous casting tundish includes an S7-200Smart main unit (7), a display screen (8), an analog output module (9), a temperature measurement module (10), a relay (11), a tri-color light (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 power the S7-200Smart main unit (7), the display screen (8), the analog output module (9), and the temperature measurement module (10) respectively (the modules are connected by wires). The S7-200Smart main unit (7) and the temperature measurement module (10) are connected via a dedicated cable for Siemens 200 series PLC modules. The analog output module (9) and the temperature measurement module (10) are connected via a dedicated cable for Siemens 200 series PLC modules. The S7-200Smart main unit (7) and the display screen (8) are connected via a network cable. The S7-200Smart main unit (7) and the relay (11) are connected via a wire. The relay (11) and the tri-color light (12) are connected via a wire. Between the relay (11) and the audible and visual alarm (13), the relay (11), the tri-color lamp (12), the audible and visual alarm (13) and the external 220VAC power supply are connected by wires. The analog output module (9) is equipped with molten pool temperature signal output (1), molten pool temperature error signal output (2), solidification temperature signal output (3), and solidification temperature error signal output (4). The temperature measuring module (10) is equipped with molten pool temperature signal input (5) and solidification temperature signal input (6).

[0046] How to use:

[0047] 1. Use a standard carbon constant temperature gun, which can simultaneously measure the molten pool temperature and solidification temperature. This gun has four signal output lines (molten pool temperature, solidification temperature), which should be connected to the molten pool signal input channel and the solidification temperature signal input channel of the system. If the signal length is insufficient, S-type thermocouple compensating wires must be used according to specifications.

[0048] 2. When the temperature probe is installed in the carbon lance, the three-color light will show green, indicating that the temperature measurement is "ready". When the probe is inserted into the molten steel for temperature measurement, if the system detects that the temperature of the molten steel is higher than 1000 degrees, the three-color light will show yellow, indicating that the temperature measurement is "in progress". When the system accurately measures the molten pool temperature and solidification temperature (or when more than 10 seconds have passed since the yellow light started to illuminate), the three-color light will show "red", indicating that the temperature measurement is over.

[0049] 3. Upon completion of the temperature measurement, the display screen shows the temperature change curves of the molten pool and the solidification temperature. A rectangular marker is placed within each curve range to indicate that the average temperature within that range is used as the measurement result. The difference between the maximum and minimum temperatures within the range is taken as the maximum temperature error (this value is used to evaluate the quality of the measurement). Both are output as a 4-20mA signal. If the temperature measurement fails, the screen only displays the temperature curves, not the measurement result data, and the signal output channel outputs 4mA.

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

[0051] Step 1: The PLC system continuously monitors the temperature data from the temperature probe with a sampling period of 50ms. When the solidification temperature or molten pool temperature is detected to be greater than 1000 degrees, the system starts recording the solidification temperature and molten pool temperature data and starts timer T1. When T1 is greater than 10 seconds (or when the molten pool temperature and solidification temperature values ​​are calculated), the data acquisition stops.

[0052] Molten pool temperature data are denoted as X[0], X[1]......X[n].

[0053] The solidification temperature data are denoted as Y[0], Y[1]......Y[n];

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

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

[0056] b. Calculate the average value of the 20 molten pool temperatures X[m]...X[m+19] and store it in XX[0]. Find the maximum value among the 20 molten pool temperatures X[m]...X[m+19] and store it in XX[1]. Find the minimum value among the 20 molten 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. Increment the counter variable m by 1. If m is greater than n-20, then 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: Establish the data sequence YY[6] and process the data according to the following logic;

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

[0061] b. Calculate the average value of the 20 molten pool temperatures X[m]...X[m+19] and store it in YY[0]. Find the maximum value among the 20 molten pool temperatures Y[m]...Y[m+19] and store it in YY[1]. Find the minimum value among the 20 molten 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. Increment the counter variable m by 1. If m is greater than n-20, then the data processing ends.

[0064] e. If YY[4] is greater than 1400 degrees and YY[5] is less than 1, the 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, 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.

[0066] Step 5: The data processing described in Steps 2 and 3 begins when more than 20 data points are collected, and continues as more data is collected. When the results measured at both locations meet the requirements, a signal indicating the end of the temperature measurement process is issued, data collection stops, the red light of the three-color indicator illuminates, and an alarm sounds to indicate the end of the temperature measurement.

[0067] Step 6: Display Results. The display screen will plot the molten pool temperature and solidification temperature curves based on the data described in section a. The vertical axis represents the temperature value, and the horizontal axis represents time (data sampling begins at 0, with each sampling point spaced 50ms apart). The molten pool temperature, solidification temperature, molten pool temperature deviation, and solidification temperature deviation will be displayed in large font in the upper right corner of the screen (*** will be displayed if data evaluation fails). The screen content and signal output will 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. Let the counting variable m = 0, XX[4] = 0, XX[5] = 10

[0070] b. Calculate the average value of the 20 molten pool temperatures X[m]...X[m+19] and store it in XX[0]. Find the maximum value among the 20 molten pool temperatures X[m]...X[m+19] and store it in XX[1]. Find the minimum value among the 20 molten 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. Increment the counter variable m by 1. If m is greater than n-20, then the data processing ends.

[0073] 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: Establish the data sequence YY[6] and process the data according to the following logic.

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

[0075] b. Calculate the average value of the 20 molten pool temperatures X[m]...X[m+19] and store it in YY[0]. Find the maximum value among the 20 molten pool temperatures Y[m]...Y[m+19] and store it in YY[1]. Find the minimum value among the 20 molten 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. Increment the counter variable m by 1. If m is greater than n-20, then the data processing ends.

[0078] e. If YY[4] is greater than 1400 degrees and YY[5] is less than 1, the 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 scope of protection of the present invention. Equivalent transformations or substitutions made based on the above technical solutions all fall within the scope of protection of the claims of the present invention.

Claims

1. A low-cost method for measuring the solidification temperature of molten steel in a continuous casting tundish, characterized in that, A low-cost measurement system for the solidification temperature of molten steel in a continuous casting tundish is adopted. The measurement system includes an S7-200 Smart main unit (7), a display screen (8), an analog output module (9), a temperature measurement module (10), and a relay (11). The system includes a tri-color light (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), which outputs 24VDC to power the S7-200Smart main unit (7), the display screen (8), the analog output module (9), and the temperature measurement module (10). The S7-200Smart main unit (7) and the temperature measurement module (10) are connected via a dedicated Siemens 200 series PLC module cable. The analog output module (9) and the temperature measurement module (10) are connected via dedicated cables. Blocks (10) are connected to each other via a dedicated Siemens 200 series PLC module cable. 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) is connected to the tri-color light (12), the relay (11) is connected to the audible and visual alarm (13), and the relay (11), tri-color light (12), audible and visual alarm (13) are connected to the external 220VAC power supply via wires. The analog output module (9) is equipped with molten pool temperature signal output (1), molten pool temperature error signal output (2), solidification temperature signal output (3), and solidification temperature error signal output (4). The temperature measurement module (10) is equipped with a molten pool temperature signal input (5) and a solidification temperature signal input (6); The method includes the following steps: Step 1: The PLC system continuously monitors the temperature data of the temperature probe with a sampling period of 50ms. When the solidification temperature or molten pool temperature is detected to be greater than 1000 degrees, the system starts recording the solidification temperature and molten pool temperature data and starts timer T1. When T1 is greater than 10 seconds, the data acquisition stops. Molten pool temperature data are denoted as X[0], X[1]......X[n]. The solidification temperature data are denoted as Y[0], Y[1]......Y[n]; Step 2: Establish the data sequence XX[6] and process the data according to the following logic; a. Let the counting variable m=0, XX[4]=0, XX[5]=10; b. Calculate the average value of the 20 molten pool temperatures X[m]...X[m+19] and store it in XX[0]. Find the maximum value among the 20 molten pool temperatures X[m]...X[m+19] and store it in XX[1]. Find the minimum value among the 20 molten 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]. c. If XX[0] is greater than 1450 degrees and XX[3] is less than XX[5], then XX[4] equals XX[0] and XX[5] equals XX[3]. d. Increment the counter variable m by 1. If m is greater than n-20, then the data processing ends. 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: Establish the data sequence YY[6] and process the data according to the following logic; a1. Let the counting variable m=0, YY[4]=0, YY[5]=10, b1. Calculate the average value of the 20 solidification temperatures Y[m]...Y[m+19] and store it in YY[0]. Find the maximum value among the 20 solidification temperatures Y[m]...Y[m+19] and store it in YY[1]. Find the minimum value among the 20 solidification 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]. c1. If YY[0] is greater than 1400 degrees and YY[3] is less than YY[5], then YY[4] equals YY[0] and YY[5] equals YY[3]. d1. Increment the counter variable m by 1. If m is greater than n-20, then the data processing ends. e1. If YY[4] is greater than 1400 degrees and YY[5] is less than 1, the data processing ends; otherwise, return to step b1 to 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 solidification temperature, and YY[5] is the final calculation result of 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 Steps 2 and 3 begins when more than 20 data points are collected, and continues as the collected data increases. When the results measured at both locations meet the requirements, a signal indicating the end of the temperature measurement process is issued, data collection stops, the red light of the three-color indicator illuminates, and an alarm sounds to indicate the end of the temperature measurement. Step 6: Display the results.

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