Heat convection device and control method thereof

Abstract

The invention relates to the technical field of metallurgical materials, and particularly discloses a heat convection device and a control method thereof.The heat convection device is arranged at the top of a hot billet burial pit and comprises a temperature zoning module used for obtaining the temperature value of each detection point in the burial pit and zoning the burial pit according to the temperature value of each detection point in the burial pit; the threshold value setting module is used for obtaining the temperature of the hot steel billet in the burial pit partition and setting an allowable temperature threshold value of the burial pit partition according to the temperature of the hot steel billet; the flow speed adjusting module is used for setting the flow speed of a refrigerant in the heat convection device according to the temperature of the hot steel billet; and the secondary adjusting module is used for obtaining the partition environment temperature of the burial pit partition and adjusting the flow speed of the refrigerant in the heat convection device according to the partition environment temperature. According to the method, the burial pit is partitioned through the temperature, the cooling speed in the burial pit is uniformly regulated and controlled according to the temperature of the hot steel billets in all the partitions, and the slow cooling effect of the hot steel billets is greatly improved.

Description

Technical Field

[0001] The present application relates to the field of metallurgical material technology, and more specifically, to a heat convection device and a control method thereof. Background Art

[0002] The steel slow cooling pit is a special cooling facility, which is mainly used to control the cooling rate of steel during the cooling process, so as to avoid or reduce the internal stress, cracks and structural defects that may be caused by rapid cooling. The slow cooling pit is usually a pit dug underground, and refractory materials and thermal insulation materials are built around and at the bottom to maintain good thermal insulation. In the slow cooling pit, the high-temperature steel or billet is placed and covered with dry sand or other thermal insulation materials to ensure that the heat can be slowly dissipated. This can make the structural changes of the steel more uniform when it undergoes phase change during the cooling process, thereby avoiding stress concentration caused by inconsistent volume expansion caused by rapid cooling, such as volume expansion during martensitic phase transformation. For some specific steels, such as alloy steel, bearing steel and high carbon steel, slow cooling can effectively prevent the formation of white spots, cracks and other microscopic defects, and improve the mechanical properties and processing performance of steel.

[0003] In the prior art, a heat convection device is usually installed inside the steel slow cooling pit for convective heat exchange between the pit and the outside of the pit to improve the slow cooling efficiency of the steel. However, the existing heat convection device does not have the function of automatically adjusting the cooling speed according to the temperature in the pit, resulting in uneven slow cooling of the steel and reduced quality of the steel. Summary of the invention

[0004] The present invention provides a heat convection device and a control method thereof, which are used to solve the problem that the heat convection device in the prior art does not have the function of automatically adjusting the cooling speed according to the temperature in the pit, resulting in that the steel cannot be uniformly and slowly cooled, and the quality of the steel is reduced, including:

[0005] The temperature partitioning module is used to obtain the temperature value of each detection point in the slow cooling pit, and partition the slow cooling pit according to the temperature value of each detection point in the slow cooling pit;

[0006] A threshold setting module is used to obtain the temperature of the hot steel billet in the slow cooling pit partition and set the allowable temperature threshold of the slow cooling pit partition according to the hot steel billet temperature;

[0007] A flow rate regulating module, used to set the flow rate of the refrigerant in the heat convection device according to the temperature of the hot steel billet;

[0008] The secondary adjustment module is used to obtain the zone ambient temperature of the slow cooling pit zone and adjust the flow rate of the refrigerant in the heat convection device according to the zone ambient temperature.

[0009] Furthermore, the temperature partition module includes a fluctuation calculation unit, and the fluctuation calculation unit is used to:

[0010] Determine the temperature change of the detection point according to the temperature value of each detection point in the slow cooling pit, and draw the temperature change curve of the detection point according to the temperature change of the detection point;

[0011] Divide the temperature change curve into several sub-change curves according to the preset rolling time window, and calculate the average temperature value of each sub-change curve;

[0012] Draw an average temperature change curve according to the average temperature value of the sub-change curve, and calculate the absolute value of the slope of two adjacent average temperature values ​​in the average temperature change curve;

[0013] The absolute values ​​of all slopes in the average temperature change curve are summed to obtain the fluctuation coefficient of the detection point;

[0014] The slow cooling pits are partitioned according to the fluctuation coefficient of the detection points based on the k-means clustering algorithm.

[0015] Furthermore, the temperature zoning module further includes a zoning unit, and the zoning unit is used to:

[0016] Obtaining a preset number of clusters k of the k-means clustering algorithm, forming a fluctuation coefficient data set according to the fluctuation coefficient of each detection point, and randomly selecting k initial cluster centers of the fluctuation coefficient data set according to the preset number of clusters k;

[0017] Calculate the Euclidean distance from each volatility coefficient in the volatility coefficient data set to each initial cluster center, and divide the volatility coefficient into corresponding clusters according to the Euclidean distance from each volatility coefficient in the volatility coefficient data set to each initial cluster center;

[0018] Calculate the average value of all fluctuation coefficients in each cluster, and recalculate the cluster center based on the average value of all fluctuation coefficients in each cluster;

[0019] The above steps are iterated repeatedly until the cluster center no longer changes or the number of iterations reaches the preset iteration threshold, and k final cluster centers are obtained. The partition of the slow cooling pit corresponding to each detection point is determined according to the clustering results.

[0020] Furthermore, the threshold setting module includes a temperature mapping unit, and the temperature mapping unit is used to:

[0021] Obtaining the initial temperature of the hot steel billet, and calculating the difference between the initial temperature of the hot steel billet and the temperature of the hot steel billet in the slow cooling pit partition;

[0022] If the difference of the hot steel billet temperature of the slow cooling pit partition is within the preset first difference range, the preset first temperature threshold is selected as the allowable temperature threshold of the slow cooling pit partition;

[0023] If the difference of the hot steel billet temperature of the slow cooling pit partition is within the preset second difference range, the preset second temperature threshold is selected as the allowable temperature threshold of the slow cooling pit partition;

[0024] If the difference in the hot steel billet temperatures of the slow cooling pit partitions is within a preset third difference range, the preset third temperature threshold is selected as the allowable temperature threshold of the slow cooling pit partitions.

[0025] Furthermore, the threshold setting module further includes a threshold correction unit, and the threshold correction unit is used to:

[0026] The allowable temperature threshold is corrected according to the threshold correction formula, and the threshold correction formula is specifically:

[0027]

[0028] Where P is the threshold correction coefficient, P r is the allowable temperature threshold of the slow cooling pit partition, F r is the preset allowable fluctuation coefficient, F is the fluctuation coefficient of the slow cooling pit partition, and Q is the preset range coefficient.

[0029] Furthermore, the flow rate regulating module includes a flow rate control unit, and the flow rate control unit is used to:

[0030] Determine the temperature change of the hot steel billet according to the temperature of the hot steel billet in the slow cooling pit partition, and draw a temperature change curve of the hot steel billet according to the temperature change of the hot steel billet;

[0031] Perform regression curve fitting on the temperature variation curve of the hot steel billet to obtain a hot steel billet temperature fitting curve, and determine the time required for the hot steel billet temperature to reach an allowable temperature threshold value according to the hot steel billet temperature fitting curve;

[0032] It is determined whether the time required for the temperature fitting curve to reach the allowable temperature threshold is within a preset time range. If not, the flow rate of the refrigerant in the heat convection device is set according to the time value exceeding the preset time range.

[0033] Furthermore, the flow rate regulation module further includes a time mapping unit, and the time mapping unit is used to:

[0034] Determine whether the time value exceeding the preset time range is greater than a first preset threshold value, and if the time value exceeding the preset time range is greater than the first preset threshold value, set the preset first flow rate as the flow rate of the refrigerant in the heat convection device;

[0035] If the time value exceeding the preset time range is less than or equal to the first preset threshold, determining whether the time value exceeding the preset time range is greater than the second preset threshold;

[0036] If the time value exceeding the preset time range is greater than the second preset threshold, the preset second flow rate is set as the flow rate of the refrigerant in the heat convection device;

[0037] If the time value exceeding the preset time range is less than or equal to the second preset threshold, the preset third flow rate is set as the flow rate of the refrigerant in the heat convection device.

[0038] Furthermore, the secondary adjustment module includes a temperature calculation unit, and the temperature calculation unit is used to:

[0039] According to the zone ambient temperature of each slow cooling pit zone, the maximum ambient temperature and the minimum ambient temperature are screened out, the difference between the maximum ambient temperature and the minimum ambient temperature is calculated, and it is determined whether the difference between the maximum ambient temperature and the minimum ambient temperature exceeds a fourth preset threshold;

[0040] When the difference between the maximum value of the ambient temperature and the minimum value of the ambient temperature does not exceed the fourth preset threshold, the refrigerant flow rate is not adjusted.

[0041] Furthermore, the secondary regulation module further includes a flow rate adjustment unit, and the flow rate adjustment unit is used to:

[0042] When the difference between the maximum ambient temperature and the minimum ambient temperature does not exceed the fourth preset threshold, the slow cooling pit partition corresponding to the maximum ambient temperature is selected, and the refrigerant flow rate in the slow cooling pit partition corresponding to the maximum ambient temperature is accelerated;

[0043] The slow cooling pit partition corresponding to the lowest ambient temperature is screened out, and the refrigerant flow rate in the slow cooling pit partition corresponding to the lowest ambient temperature is reduced.

[0044] In order to achieve the above object, the present invention also provides a control method of a heat convection device, comprising:

[0045] Obtain the temperature value of each detection point in the slow cooling pit, and divide the slow cooling pit into zones according to the temperature value of each detection point in the slow cooling pit;

[0046] Obtain the temperature of the hot steel billet in the slow cooling pit partition, and set the allowable temperature threshold of the slow cooling pit partition according to the hot steel billet temperature;

[0047] The flow rate of the refrigerant in the heat convection device is set according to the temperature of the hot steel billet;

[0048] The zone ambient temperature of the slow cooling pit zone is obtained, and the flow rate of the refrigerant in the heat convection device is adjusted according to the zone ambient temperature.

[0049] The beneficial effects of the present invention are:

[0050] By applying the above technical scheme, the present invention divides the slow cooling pit into zones through the temperature zoning module, so as to facilitate targeted adjustment of the temperature in the slow cooling pit according to different zones, and adjusts the cooling speed of different zones according to the temperature of the hot steel billet through the flow rate regulation module, thereby realizing automatic regulation of the cooling speed, and makes the overall temperature in the pit more balanced through the secondary regulation module, thereby ensuring that the temperature in the entire slow cooling pit is uniform, so that the hot steel billet is uniformly slow cooled, and the slow cooling effect is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0052] Figure 1 The overall structure diagram of a heat convection device proposed in an embodiment of the present invention is shown;

[0053] Figure 2 A schematic flow chart of a control method for a heat convection device proposed in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] The present application embodiment provides a heat convection device, such as Figure 1 As shown, the heat convection device is arranged on the top of the hot billet slow cooling pit, and comprises:

[0056] The temperature zoning module is used to obtain the temperature value of each detection point in the slow cooling pit, and to divide the slow cooling pit into zones according to the temperature value of each detection point in the slow cooling pit; the threshold setting module is used to obtain the hot billet temperature within the slow cooling pit zone, and to set the allowable temperature threshold of the slow cooling pit zone according to the hot billet temperature; the flow rate adjustment module is used to set the flow rate of the refrigerant in the heat convection device according to the hot billet temperature; the secondary adjustment module is used to obtain the zone ambient temperature of the slow cooling pit zone, and to adjust the flow rate of the refrigerant in the heat convection device according to the zone ambient temperature.

[0057] In this embodiment, the heat convection device is arranged at the pit cover at the top of the slow cooling pit, and a number of detection points are evenly distributed in the slow cooling pit. A temperature sensor for detecting the ambient temperature and the corresponding hot steel billet temperature is provided at each detection point, and a convection heat exchange mechanism of the heat convection device is correspondingly arranged above each detection point. The slow cooling speed of the hot steel billet in the slow cooling pit is regulated by the convection heat exchange mechanism. The refrigerant in the heat convection device can be cooling gas or coolant, which can be selected according to the actual project situation.

[0058] In some embodiments of the present application, the temperature partitioning module includes a fluctuation calculation unit, which is used to: determine the temperature change of the detection point according to the temperature value of each detection point in the slow cooling pit, and draw a temperature change curve of the detection point according to the temperature change of the detection point; divide the temperature change curve into several sub-change curves according to a preset rolling time window, and calculate the average temperature value of each sub-change curve; draw an average temperature change curve according to the average temperature value of the sub-change curve, and calculate the absolute value of the slope of two adjacent average temperature values ​​in the average temperature change curve; sum all the absolute values ​​of the slopes in the average temperature change curve to obtain the fluctuation coefficient of the detection point; partition the slow cooling pit according to the fluctuation coefficient of the detection point based on the k-means clustering algorithm.

[0059] In this embodiment, the fluctuation coefficient at the detection point is obtained by calculating the sum of the absolute values ​​of all slopes in the average temperature change curve. The higher the fluctuation coefficient, the more easily the ambient temperature at the detection point is affected by temperature fluctuations.

[0060] In some embodiments of the present application, the temperature partitioning module also includes a partitioning unit, which is used to: obtain a preset cluster number k of the k-means clustering algorithm, form a fluctuation coefficient data set according to the fluctuation coefficient of each detection point, and randomly select k initial clustering centers of the fluctuation coefficient data set according to the preset cluster number k; calculate the Euclidean distance from each fluctuation coefficient in the fluctuation coefficient data set to each initial clustering center, and divide the fluctuation coefficient into corresponding clusters according to the Euclidean distance from each fluctuation coefficient in the fluctuation coefficient data set to each initial clustering center; calculate the average value of all fluctuation coefficients in each cluster, and recalculate the cluster center according to the average value of all fluctuation coefficients in each cluster; repeat the above steps until the cluster center no longer changes or the number of iterations reaches a preset iteration threshold, and obtain k final cluster centers, and determine the partition of the slow cooling pit corresponding to each detection point according to the clustering results.

[0061] In this embodiment, the preset number of clusters k can be obtained by the number of detection points. The more detection points there are, the larger the number of clusters k is. In this embodiment, the number of clusters k is set to 6, and the detection points are divided into 6 partitions based on the k-means clustering algorithm according to the fluctuation coefficient of the detection points.

[0062] In some embodiments of the present application, the threshold setting module includes a temperature mapping unit, which is used to: obtain the initial temperature of the hot steel billet, calculate the difference between the initial temperature of the hot steel billet and the temperature of the hot steel billet in the slow cooling pit partition; if the difference in the hot steel billet temperature of the hot steel billet slow cooling pit partition is in a preset first difference interval, then the preset first temperature threshold is selected as the allowable temperature threshold of the slow cooling pit partition; if the difference in the hot steel billet temperature of the hot steel billet slow cooling pit partition is in a preset second difference interval, then the preset second temperature threshold is selected as the allowable temperature threshold of the slow cooling pit partition; if the difference in the hot steel billet temperature of the hot steel billet slow cooling pit partition is in a preset third difference interval, then the preset third temperature threshold is selected as the allowable temperature threshold of the slow cooling pit partition.

[0063] In this embodiment, the allowable temperature threshold is determined by calculating the difference between the initial temperature of the hot steel billet and the real-time temperature of the hot steel billet in the slow cooling pit partition. The first temperature threshold, the second temperature threshold, and the third temperature threshold are preset values ​​and decrease in sequence. The preset first difference interval, the preset second difference interval, and the preset third difference interval increase in sequence. The greater the difference between the initial temperature of the hot steel billet and the real-time temperature, the lower the corresponding allowable temperature threshold.

[0064] In some embodiments of the present application, the threshold setting module further includes a threshold correction unit, which is used to correct the allowable temperature threshold according to a threshold correction formula. The threshold correction formula is specifically:

[0065]

[0066] Where P is the threshold correction coefficient, P r is the allowable temperature threshold of the slow cooling pit partition, F r is the preset allowable fluctuation coefficient, F is the fluctuation coefficient of the slow cooling pit partition, and Q is the preset range coefficient.

[0067] In this embodiment, the allowable temperature threshold is corrected by the fluctuation coefficient of the slow cooling pit partition, and the allowable temperature threshold of each partition is adjusted specifically according to the fluctuation coefficient.

[0068] In some embodiments of the present application, the flow rate regulation module includes a flow rate control unit, which is used to: determine the temperature change of the hot steel billet according to the temperature of the hot steel billet in the slow cooling pit partition, and draw a temperature change curve of the hot steel billet according to the temperature change of the hot steel billet; perform regression curve fitting on the temperature change curve of the hot steel billet to obtain a hot steel billet temperature fitting curve, and determine the time required for the hot steel billet temperature to reach an allowable temperature threshold based on the hot steel billet temperature fitting curve; determine whether the time required for the temperature fitting curve to reach the allowable temperature threshold is within a preset time range, and if not within the preset time range, set the flow rate of the refrigerant in the heat convection device according to the time value exceeding the preset time range.

[0069] In this embodiment, the temperature change of the hot steel billet is predicted by the hot steel billet temperature fitting curve, and the time required for the hot steel billet temperature to reach the allowable temperature threshold is determined based on the prediction result. By setting a preset time range, it is determined whether to control the flow rate of the refrigerant in the heat convection device.

[0070] In some embodiments of the present application, the flow rate regulation module also includes a time mapping unit, which is used to: determine whether the time value exceeding the preset time range is greater than a first preset threshold value; if the time value exceeding the preset time range is greater than the first preset threshold value, the preset first flow rate is set as the flow rate of the refrigerant in the heat convection device; if the time value exceeding the preset time range is less than or equal to the first preset threshold value, determine whether the time value exceeding the preset time range is greater than the second preset threshold value; if the time value exceeding the preset time range is greater than the second preset threshold value, the preset second flow rate is set as the flow rate of the refrigerant in the heat convection device; if the time value exceeding the preset time range is less than or equal to the second preset threshold value, the preset third flow rate is set as the flow rate of the refrigerant in the heat convection device.

[0071] In this embodiment, when it is necessary to control the refrigerant flow rate, the time value exceeding the preset time range is obtained by calculating the difference between the predicted time required for the hot steel billet temperature to reach the allowable temperature threshold and the preset time range. The first flow rate, the second flow rate, and the third flow rate are reduced in sequence. The larger the time value exceeding the preset time range, the faster the corresponding refrigerant flow rate, and the faster the corresponding cooling speed of the hot steel billet. By adjusting the cooling speed of the hot steel billet, uniform and slow cooling of the hot steel billet can be achieved.

[0072] In some embodiments of the present application, the secondary adjustment module includes a temperature calculation unit, which is used to: filter out the maximum ambient temperature and the minimum ambient temperature according to the partition ambient temperature of each slow cooling pit partition, calculate the difference between the maximum ambient temperature and the minimum ambient temperature, and determine whether the difference between the maximum ambient temperature and the minimum ambient temperature exceeds a fourth preset threshold; when the difference between the maximum ambient temperature and the minimum ambient temperature does not exceed the fourth preset threshold, the refrigerant flow rate is not adjusted.

[0073] In this embodiment, the difference between the highest and lowest values ​​of the ambient temperature of the partitions in the entire slow cooling pit is calculated, and whether the temperature distribution in the slow cooling pit is uniform is determined by a pre-set fourth preset threshold. When the temperature distribution is uniform, there is no need to make a secondary adjustment to the refrigerant flow rate.

[0074] In some embodiments of the present application, the secondary regulation module also includes a flow rate adjustment unit, which is used to: when the difference between the maximum ambient temperature and the minimum ambient temperature does not exceed a fourth preset threshold, screen out the slow cooling pit partition corresponding to the maximum ambient temperature, and speed up the refrigerant flow rate in the slow cooling pit partition corresponding to the maximum ambient temperature; screen out the slow cooling pit partition corresponding to the minimum ambient temperature, and reduce the refrigerant flow rate in the slow cooling pit partition corresponding to the minimum ambient temperature.

[0075] In this embodiment, by increasing the refrigerant flow rate in the slow cooling pit zone corresponding to the highest ambient temperature and reducing the refrigerant flow rate in the slow cooling pit zone corresponding to the lowest ambient temperature, the temperature distribution in the entire slow cooling pit is uniform, which can effectively improve the quality of steel.

[0076] Based on the same technical concept, such as Figure 2 As shown, the present invention also provides a control method for a heat convection device, comprising:

[0077] S101, obtaining the temperature value of each detection point in the slow cooling pit, and dividing the slow cooling pit into zones according to the temperature value of each detection point in the slow cooling pit;

[0078] S102, obtaining the temperature of the hot steel billet in the slow cooling pit partition, and setting the allowable temperature threshold of the slow cooling pit partition according to the hot steel billet temperature;

[0079] S103, setting the flow rate of the coolant in the heat convection device according to the temperature of the hot steel billet;

[0080] S104, obtaining the zone ambient temperature of the slow cooling pit zone, and adjusting the flow rate of the refrigerant in the heat convection device according to the zone ambient temperature.

[0081] By applying the above technical scheme, the present invention discloses a heat convection device and a control method thereof, wherein the heat convection device is arranged at the top of the slow cooling pit of the hot steel billet, and comprises: a temperature partitioning module, which is used to obtain the temperature value of each detection point in the slow cooling pit, and partition the slow cooling pit according to the temperature value of each detection point in the slow cooling pit; a threshold setting module, which is used to obtain the temperature of the hot steel billet in the partition of the slow cooling pit, and set the allowable temperature threshold of the partition of the slow cooling pit according to the temperature of the hot steel billet; a flow rate adjustment module, which is used to set the flow rate of the refrigerant in the heat convection device according to the temperature of the hot steel billet; a secondary adjustment module, which is used to obtain the partition ambient temperature of the partition of the slow cooling pit, and adjust the flow rate of the refrigerant in the heat convection device according to the partition ambient temperature. The present invention partitions the slow cooling pit by temperature, and uniformly regulates the cooling rate in the slow cooling pit according to the temperature of the hot steel billet in each partition, which greatly improves the slow cooling effect of the hot steel billet.

[0082] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present invention can be implemented by hardware, or by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each implementation scenario of the present invention.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A heat convection device, which is arranged on the top of a hot billet slow cooling pit, characterized in that: include: The temperature partitioning module is used to obtain the temperature value of each detection point in the slow cooling pit, and partition the slow cooling pit according to the temperature value of each detection point in the slow cooling pit; A threshold setting module is used to obtain the temperature of the hot steel billet in the slow cooling pit partition and set the allowable temperature threshold of the slow cooling pit partition according to the hot steel billet temperature; A flow rate regulating module, used to set the flow rate of the refrigerant in the heat convection device according to the temperature of the hot steel billet; The secondary adjustment module is used to obtain the zone ambient temperature of the slow cooling pit zone and adjust the flow rate of the refrigerant in the heat convection device according to the zone ambient temperature.

2. The heat convection device according to claim 1, characterized in that: The temperature partition module includes a fluctuation calculation unit, which is used to: Determine the temperature change of the detection point according to the temperature value of each detection point in the slow cooling pit, and draw the temperature change curve of the detection point according to the temperature change of the detection point; Divide the temperature change curve into several sub-change curves according to the preset rolling time window, and calculate the average temperature value of each sub-change curve; Draw an average temperature change curve according to the average temperature value of the sub-change curve, and calculate the absolute value of the slope of two adjacent average temperature values ​​in the average temperature change curve; The absolute values ​​of all slopes in the average temperature change curve are summed to obtain the fluctuation coefficient of the detection point; The slow cooling pits are partitioned according to the fluctuation coefficient of the detection points based on the k-means clustering algorithm.

3. The heat convection device according to claim 2, characterized in that: The temperature zoning module further includes a zoning unit, and the zoning unit is used to: Obtaining a preset number of clusters k of the k-means clustering algorithm, forming a fluctuation coefficient data set according to the fluctuation coefficient of each detection point, and randomly selecting k initial cluster centers of the fluctuation coefficient data set according to the preset number of clusters k; Calculate the Euclidean distance from each volatility coefficient in the volatility coefficient data set to each initial cluster center, and divide the volatility coefficient into corresponding clusters according to the Euclidean distance from each volatility coefficient in the volatility coefficient data set to each initial cluster center; Calculate the average value of all fluctuation coefficients in each cluster, and recalculate the cluster center based on the average value of all fluctuation coefficients in each cluster; The above steps are iterated repeatedly until the cluster center no longer changes or the number of iterations reaches the preset iteration threshold, and k final cluster centers are obtained. The partition of the slow cooling pit corresponding to each detection point is determined according to the clustering results.

4. The heat convection device according to claim 2, characterized in that: The threshold setting module includes a temperature mapping unit, and the temperature mapping unit is used to: Obtaining the initial temperature of the hot steel billet, and calculating the difference between the initial temperature of the hot steel billet and the temperature of the hot steel billet in the slow cooling pit partition; If the difference of the hot steel billet temperature of the slow cooling pit partition is within the preset first difference range, the preset first temperature threshold is selected as the allowable temperature threshold of the slow cooling pit partition; If the difference of the hot steel billet temperature of the slow cooling pit partition is within the preset second difference range, the preset second temperature threshold is selected as the allowable temperature threshold of the slow cooling pit partition; If the difference in the hot steel billet temperatures of the slow cooling pit partitions is within a preset third difference range, the preset third temperature threshold is selected as the allowable temperature threshold of the slow cooling pit partitions.

5. The heat convection device according to claim 4, characterized in that: The threshold setting module further includes a threshold correction unit, which is used to: The allowable temperature threshold is corrected according to the threshold correction formula, and the threshold correction formula is specifically: Where P is the threshold correction coefficient, P r is the allowable temperature threshold of the slow cooling pit partition, F r is the preset allowable fluctuation coefficient, F is the fluctuation coefficient of the slow cooling pit partition, and Q is the preset range coefficient.

6. The heat convection device according to claim 1, characterized in that: The flow rate regulating module includes a flow rate control unit, which is used to: Determine the temperature change of the hot steel billet according to the temperature of the hot steel billet in the slow cooling pit partition, and draw a temperature change curve of the hot steel billet according to the temperature change of the hot steel billet; Perform regression curve fitting on the temperature variation curve of the hot steel billet to obtain a hot steel billet temperature fitting curve, and determine the time required for the hot steel billet temperature to reach an allowable temperature threshold value according to the hot steel billet temperature fitting curve; It is determined whether the time required for the temperature fitting curve to reach the allowable temperature threshold is within a preset time range. If not, the flow rate of the refrigerant in the heat convection device is set according to the time value exceeding the preset time range.

7. The heat convection device according to claim 6, characterized in that: The flow rate regulation module further includes a time mapping unit, which is used to: Determine whether the time value exceeding the preset time range is greater than a first preset threshold value, and if the time value exceeding the preset time range is greater than the first preset threshold value, set the preset first flow rate as the flow rate of the refrigerant in the heat convection device; If the time value exceeding the preset time range is less than or equal to the first preset threshold, determining whether the time value exceeding the preset time range is greater than the second preset threshold; If the time value exceeding the preset time range is greater than the second preset threshold, the preset second flow rate is set as the flow rate of the refrigerant in the heat convection device; If the time value exceeding the preset time range is less than or equal to the second preset threshold, the preset third flow rate is set as the flow rate of the refrigerant in the heat convection device.

8. The heat convection device according to claim 1, characterized in that: The secondary adjustment module includes a temperature calculation unit, which is used to: According to the zone ambient temperature of each slow cooling pit zone, the maximum ambient temperature and the minimum ambient temperature are screened out, the difference between the maximum ambient temperature and the minimum ambient temperature is calculated, and it is determined whether the difference between the maximum ambient temperature and the minimum ambient temperature exceeds a fourth preset threshold; When the difference between the maximum value of the ambient temperature and the minimum value of the ambient temperature does not exceed the fourth preset threshold, the refrigerant flow rate is not adjusted.

9. The heat convection device according to claim 8, characterized in that: The secondary regulation module further includes a flow rate adjustment unit, which is used to: When the difference between the maximum ambient temperature and the minimum ambient temperature does not exceed the fourth preset threshold, the slow cooling pit partition corresponding to the maximum ambient temperature is selected, and the refrigerant flow rate in the slow cooling pit partition corresponding to the maximum ambient temperature is accelerated; The slow cooling pit partition corresponding to the lowest ambient temperature is screened out, and the refrigerant flow rate in the slow cooling pit partition corresponding to the lowest ambient temperature is reduced.

10. A method for controlling a heat convection device, characterized in that: include: Obtain the temperature value of each detection point in the slow cooling pit, and divide the slow cooling pit into zones according to the temperature value of each detection point in the slow cooling pit; Obtain the temperature of the hot steel billet in the slow cooling pit partition, and set the allowable temperature threshold of the slow cooling pit partition according to the hot steel billet temperature; The flow rate of the refrigerant in the heat convection device is set according to the temperature of the hot steel billet; The zone ambient temperature of the slow cooling pit zone is obtained, and the flow rate of the refrigerant in the heat convection device is adjusted according to the zone ambient temperature.

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