Intelligent temperature control system for ultrathin plate strip

Abstract

The invention relates to the technical field of ultrathin hot rolled strip steel shape control, in particular to an intelligent temperature control system for an ultrathin strip. The scanning unit is used for collecting the temperature of the preset position of the plate strip; the modeling unit is used for generating a strip surface temperature loss model and calculating the simulation temperature of the strip surface temperature loss model; the comparison unit is used for determining the temperature rise requirement of the heating position; the analysis unit is used for outputting adjustment information under the state that the induction heater is started; the adjusting unit is used for driving the induction heater to the heating position, adjusting the heating power of the induction heater according to the heating requirement, and receiving the adjusting information to adjust the heating position and the heating power; according to the intelligent temperature control system for the ultra-thin plate strip, temperature control is accurately carried out in the mode that all the devices are arranged, energy consumption is reduced, plate strip defects caused by uneven temperature are reduced, and the accuracy of the intelligent temperature control system for the ultra-thin plate strip is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-thin hot-rolled strip shape control, and in particular to an intelligent temperature control system for ultra-thin strips. Background Art

[0002] Thin strip continuous casting realizes the short process of "replacing cold with heat" in terms of specifications. Thin strip continuous casting is a continuous steel casting technology that solves the problems of high energy consumption, complex process, long production cycle and difficulty in conversion of traditional thin steel processing technology. It has the advantages of short process, fewer processes, low energy consumption, less emissions and green environmental protection. The process principle of thin strip continuous casting technology is to directly inject liquid molten steel into a pair of casting rollers rotating in opposite directions. After the molten steel passes through the casting rollers, it is directly cast into a cast strip. Then the thin cast strip is sent to the rolling mill through the guide rollers and the pinch rollers. After being rolled to the target thickness, it is cooled to the target temperature by the laminar cooling system and then enters the coiler to be coiled. At present, due to the fast production speed of thin strip continuous casting and the unevenness of the plate and strip, the spray water of the laminar cooling system will accumulate on the plate and strip to form a low temperature zone. In addition, different spray water configurations will also cause different specifications of plates and strips to present different low temperature areas in the direction of billet drawing, and the size and position of the low temperature area are also randomly different. Conventional control methods include reducing production speed, extending rolling production lines, adjusting water spraying methods and increasing strip temperature, but none of them can fundamentally solve the problem of temperature uniformity. Moreover, the above control methods also affect production efficiency and increase production costs.

[0003] China's patent application publication number: CN118404021A discloses a method for optimizing the process control of ultra-thin copper strips. The invention discloses a method for optimizing the process control of ultra-thin copper strips, which uses a copper liquid flow model and a real-time cooling strategy to optimize the microstructure of ingots in continuous casting to ensure uniform material properties. Based on historical data analysis, a heat treatment plan is customized for each batch of ingots. Through the integrated sensor and monitoring system, the heat treatment conditions are automatically adjusted to achieve high efficiency and energy saving and environmental protection. In the cold rolling process, online thickness gauge data is collected, and the pressure and speed are dynamically adjusted to ensure uniform thickness of the copper strip. Finite element simulation and algorithms are used in the straightening process to optimize the straightening force according to the stress distribution. Local heating or mechanical stretching is selectively implemented through real-time monitoring to effectively manage residual stress. Finally, the Internet of Things technology is integrated to comprehensively collect production data, establish a big data analysis platform, continuously learn and optimize the production model, drive the iterative upgrade of process parameters, and achieve the control of material microstructure to the final product quality assurance.

[0004] Chinese patent application publication number: CN116571564A discloses a flexible rolling method for integrated control of macro-micro shape of plates and strips. The invention provides a flexible rolling method for integrated control of macro-micro shape of plates and strips, which belongs to the field of iron and steel metallurgy. The invention reengineers the process path and equipment layout of traditional flexible rolling production process, gives full play to the physical metallurgical characteristics and equipment potential of double heat storage soaking furnace, reversible rough rolling unit, induction heating device, and nozzle cooling device, ensures that the temperature of the edge of the roller and the temperature in the width and thickness direction of the plate in the flexible rolling production process are uniform, realizes fine control of the macroscopic plate shape and microstructure of the plate and strip, and improves the comprehensive performance of the finished product on the basis of ensuring non-stop and efficient production of flexible rolling, solves the problems caused by the traditional flexible rolling that highly sacrifices product quality in pursuit of near-net shape manufacturing, makes full use of the latest process equipment to give full play to the characteristics of each process, and realizes integrated control of the shape of the plate and strip throughout the entire process.

[0005] However, the above method has the following problems: the local influence of the spraying of cooling water on the temperature of the strip is not considered, the temperature change of the strip is not accurately monitored, and the strip cannot be heated accurately. Summary of the invention

[0006] To this end, the present invention provides an intelligent temperature control system for ultra-thin strips to overcome the problems in the prior art that the local influence of the spraying of cooling water on the temperature of the strip is not considered, the temperature change of the strip is not accurately monitored, and the strip cannot be accurately heated.

[0007] To achieve the above object, the present invention provides an intelligent temperature control system for ultra-thin strips, comprising:

[0008] A plurality of induction heaters are arranged in the adjustment area to heat the strip;

[0009] A scanning unit, which is used to collect the temperature values ​​of each strip area at a preset position of the plate before and after the induction heater is turned on, and respectively generate a first measured temperature and a second measured temperature of each strip area, and calculate the second measured average temperature of each strip area;

[0010] A modeling unit, which is used to generate a plate strip surface temperature loss model according to incoming material parameters and laminar cooling system parameters, and calculate a simulated temperature of the plate strip surface temperature loss model;

[0011] The incoming material parameters include the steel type, specification and size of the strip and the initial temperature of the strip before entering the laminar cooling system, and the laminar cooling system parameters include the spray port position and the spray port water flow rate;

[0012] a comparison unit, which is connected to the scanning unit and the modeling unit respectively, and is used for receiving the first measured temperature and the simulated temperature of each of the strip areas and performing a difference to obtain a first temperature difference of each of the strip areas, and comparing the absolute value of each of the first temperature difference with a first preset temperature difference, and assigning a weighted coefficient to the strip surface temperature loss model according to the comparison result to calibrate the strip surface temperature loss model and determine the heating requirement of the heating position;

[0013] an analyzing unit connected to the scanning unit, for receiving and respectively calculating the difference between each second measured temperature and the second measured average temperature when the induction heater is turned on, obtaining the second temperature difference of each strip area, and comparing the absolute value of each second temperature difference with the second preset temperature difference, and outputting adjustment information according to the comparison result combined with the size of the second temperature difference;

[0014] an adjustment unit, which is connected to the comparison unit, the analysis unit and the induction heater respectively, and is used to drive the induction heater to a heating position according to the calibrated strip surface temperature loss model and adjust the heating power of the induction heater according to the heating demand, and receive the adjustment information to adjust the heating position and the heating power when the induction heater is turned on;

[0015] The preset position includes a plurality of the strip areas and is located at any position between the laminar cooling system and the coiler. The strip areas are low-temperature areas that are distributed in strips between the laminar cooling system and the coiler along the processing direction of the plate and strip. The adjustment area is a low-temperature area that is distributed in strips in front of the laminar cooling system along the processing direction of the plate and strip.

[0016] Furthermore, the comparison unit compares the absolute value of each of the first temperature difference values ​​with the first preset temperature difference value, and assigns a weighted coefficient to the strip surface temperature loss model according to the comparison result to calibrate the strip surface temperature loss model, wherein:

[0017] If the absolute value of the first temperature difference is greater than the first preset temperature difference, a weighted coefficient is assigned to the strip surface temperature loss model to calibrate the strip surface temperature loss model;

[0018] Wherein, the first preset temperature difference is related to the initial temperature and the water flow rate of the spray nozzle.

[0019] Furthermore, the comparison unit determines the temperature increase requirement of the heating position after completing the calibration of the strip surface temperature loss model, wherein:

[0020] Calculating the calibration temperature value of each strip area in the calibrated strip surface temperature loss model,

[0021] The maximum value of the calibration temperature is selected, and the calibration temperature difference between the maximum value of the calibration temperature and the remaining calibration temperatures is calculated to determine the temperature increase requirement of each of the strip-shaped areas.

[0022] Furthermore, the adjustment unit drives the induction heater to the heating position according to the calibrated strip surface temperature loss model, wherein:

[0023] The adjustment unit selects a preset number of the heating requirements from large to small,

[0024] Set the strip area corresponding to the heating demand as the heating position,

[0025] driving the induction heater to the heating position,

[0026] The preset number is less than or equal to the number of the induction heaters.

[0027] Furthermore, the adjustment unit adjusts the heating power of the induction heater according to the temperature increase requirement, wherein:

[0028] If the calibration temperature difference is less than the maximum temperature rise capacity of the induction heater, driving the single induction heater to the heating position and determining the power of the induction heater according to the calibration temperature difference;

[0029] If the calibration temperature difference is greater than or equal to the maximum temperature rise capacity of the induction heater, determining the number of the induction heaters and the power of each of the induction heaters according to the calibration temperature difference;

[0030] The maximum temperature rise capacity of the induction heater is the maximum temperature value that the strip can be raised to after passing through the induction heater.

[0031] Further, the analysis unit compares the absolute value of each of the second temperature difference values ​​with the second preset temperature difference value, and determines whether to output the adjustment information according to the comparison result, wherein:

[0032] If the absolute value of the second temperature difference is greater than the second preset temperature difference, determining and outputting the adjustment information;

[0033] The second preset temperature difference is related to the heating power of the induction heater and the water flow rate of the spray nozzle, and the adjustment information includes moving the position of the induction heater and increasing / decreasing the heating power.

[0034] Furthermore, the analysis unit, in a state of determining to output the adjustment information, outputs the corresponding adjustment information according to the second temperature difference value that triggers the determination, wherein:

[0035] If the second temperature difference is a negative value, outputting the adjustment information for increasing the heating power;

[0036] If the second temperature difference is a positive value, the adjustment information for reducing the heating power is output.

[0037] Further, the analysis unit, in a state of determining to output the adjustment information, outputs the adjustment information for moving the position of the induction heater according to the second temperature difference value that triggers the determination, wherein:

[0038] If the second temperature difference is a positive value and its absolute value is greater than a third preset temperature difference, outputting the adjustment information of the single induction heater in the adjustment area corresponding to the second temperature difference;

[0039] If the second temperature difference is a negative value and its absolute value is greater than the third preset temperature difference, then outputting the adjustment information of moving a single induction heater into the adjustment area corresponding to the second temperature difference;

[0040] The absolute value of the third preset temperature difference is greater than the absolute value of the second preset temperature difference and is related to the heating power of the induction heater and the water flow rate of the spray nozzle.

[0041] Furthermore, when the adjustment unit receives the adjustment information for removing the single induction heater from the adjustment area corresponding to the second temperature difference, if there is only a single induction heater in the adjustment area corresponding to the second temperature difference, the heating power of the induction heater is reduced.

[0042] Furthermore, when the adjustment unit receives the adjustment information of moving a single induction heater into the adjustment area corresponding to the second temperature difference, if there is no idle induction heater, the water flow rate of the spray outlet corresponding to the second temperature difference is reduced.

[0043] Compared with the prior art, the beneficial effect of the present invention lies in that the system of the present invention can improve the internal stress distribution of the plate and strip by arranging a number of induction heaters to preheat the area with a high degree of temperature drop after the plate and strip passes through the laminar cooling system. This uniform temperature distribution can make the internal stress distribution of the plate and strip more reasonable, reduce the quality problems of the plate and strip caused by thermal stress concentration, improve the flatness and dimensional accuracy of the plate and strip, thereby improving product quality, and at the same time make the mechanical properties of the plate and strip more uniform, improve its toughness, ductility and other performance indicators, better meet the requirements of subsequent processing and use, reduce the difficulty of subsequent processing, reduce the scrap rate in the processing process, and improve production efficiency. At the same time, it can also extend the service life of processing molds and other equipment. While enhancing the adaptability to subsequent processing, it effectively improves the accuracy and practicality of the intelligent temperature control system for ultra-thin plates and strips.

[0044] Furthermore, the present invention generates a surface temperature loss model of the plate and strip by analyzing the input parameters through the modeling unit, and adjusts the surface temperature loss model of the plate and strip by collecting the actual measured temperature after passing through the laminar cooling system, so as to improve the accuracy of temperature prediction. These actual data include the influence of various complex actual factors. By comparing these measured temperatures with the model predicted temperatures, inaccuracies in the model can be found. By analyzing the actual measured temperatures after passing through the laminar cooling system, the surface temperature loss model of the plate and strip is assigned a weighted coefficient for model adjustment. After the model is adjusted, the surface temperature loss of the plate and strip can be predicted more accurately, thereby providing a more reliable temperature parameter basis for subsequent process control. While improving the stability of product quality, the accuracy and practicality of the intelligent temperature control system for ultra-thin plates and strips are further improved.

[0045] Furthermore, the present invention measures and analyzes the temperature of the plate and strip that passes through the laminar cooling system after turning on the induction heater, and timely adjusts the heating position and heating power of the induction heater to optimize temperature control and improve product quality. Adjusting the heating power is also very important. Appropriate heating power can make the plate and strip reach an ideal temperature distribution before entering the laminar cooling system, which helps to produce plates and strips with uniform structure and stable performance, improve the mechanical properties of the plate and strip such as strength, toughness and ductility, reduce defects such as deformation and warping of the plate and strip caused by uneven temperature, and improve product quality. This precise control can effectively reduce energy waste and reduce production costs. The adaptability and flexibility of this process can enable enterprises to respond to changes in market demand more efficiently, quickly adjust production strategies, and produce high-quality plate and strip products that meet the requirements of different customers, further improving the accuracy and practicality of the intelligent temperature control system for ultra-thin plates and strips.

[0046] Furthermore, the present invention can accurately control the temperature by reducing the heating power of a single induction heater and reducing the water flow rate of the corresponding spray nozzle in response to the situation that there is only a single induction heater in a single adjustment area and all induction heaters are in working state. This precise control helps to produce products with higher quality and more uniform performance. For metal products, it can ensure that their performance indicators such as hardness, toughness, and ductility meet strict standards, reduce product defects caused by temperature fluctuations, and reduce energy consumption, which not only reduces the production cost of the enterprise, but also helps to save energy and reduce emissions. In the long run, for large-scale production enterprises, the energy cost saving effect is significant. At the same time, the extension of the service life of the equipment means reducing the frequency of equipment maintenance and replacement, reducing equipment maintenance costs, improving equipment reliability and production continuity, and further improving the accuracy and practicality of the intelligent temperature control system for ultra-thin plates and strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of the intelligent temperature control system for ultra-thin strips of the present invention;

[0048] Figure 2 A schematic diagram of the positions of the strip area and the adjustment area according to an embodiment of the present invention;

[0049] Figure 3 A flow chart showing the determination of outputting adjustment information according to an embodiment of the present invention;

[0050] Figure 4 This is a working diagram of the intelligent temperature control system according to an embodiment of the present invention;

[0051] Among them, 1, plate and strip; 2, casting roll; 3, hot rolling roll; 4, induction heater; 5, laminar cooling system; 6, coiler; 7, center line of low temperature area; 8, strip area; 9, adjustment area. DETAILED DESCRIPTION

[0052] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0053] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0054] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0055] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] See also Figure 1 As shown, it is a structural schematic diagram of an intelligent temperature control system for ultra-thin strips of the present invention, an intelligent temperature control system for ultra-thin strips, comprising:

[0057] A plurality of induction heaters are arranged in the adjustment area to heat the plate strip;

[0058] A scanning unit, which is used to collect the temperature values ​​of each strip area at a preset position of the plate before and after the induction heater is turned on, and respectively generate a first measured temperature and a second measured temperature of each strip area, and calculate the second measured average temperature of each strip area;

[0059] It can be understood that the second measured average temperature of each strip-shaped area is the average value of the second measured temperatures of each strip-shaped area.

[0060] A modeling unit, which is used to generate a plate strip surface temperature loss model according to incoming material parameters and laminar cooling system parameters, and calculate a simulated temperature of the plate strip surface temperature loss model;

[0061] It can be understood that there is a mapping relationship between the incoming material parameters and the laminar cooling system parameters, and the mapping relationship is the plate surface temperature loss model. It is not difficult to see that the laminar cooling system parameters corresponding to any incoming material parameters that meet the mapping relationship can be obtained by using the plate surface temperature loss model.

[0062] Among them, the incoming material parameters include the steel type, specification and size of the plate and strip, and the initial temperature of the plate and strip before entering the laminar cooling system. The laminar cooling system parameters include the spray port position and the spray port water flow rate.

[0063] A comparison unit, which is connected to the scanning unit and the modeling unit respectively, and is used to receive the first measured temperature and the simulated temperature of each strip area and to obtain the first temperature difference of each strip area by difference, and to compare the absolute value of each first temperature difference with the first preset temperature difference, and to assign a weighted coefficient to the strip surface temperature loss model according to the comparison result, to calibrate the strip surface temperature loss model and determine the temperature rise requirement of the heating position;

[0064] an analysis unit connected to the scanning unit, for receiving and respectively calculating the difference between each second measured temperature and the second measured average temperature when the induction heater is turned on, obtaining the second temperature difference of each strip area, and comparing the absolute value of each second temperature difference with the second preset temperature difference, and outputting adjustment information according to the comparison result combined with the size of the second temperature difference;

[0065] an adjustment unit, which is connected to the comparison unit, the analysis unit and the induction heater respectively, and is used to drive the induction heater to a heating position according to the calibrated strip surface temperature loss model and adjust the heating power of the induction heater according to the heating demand, and receive adjustment information to adjust the heating position and heating power when the induction heater is turned on;

[0066] The preset position includes several strip areas and is located at any position between the laminar cooling system and the coiler. The strip area is a low-temperature area located between the laminar cooling system and the coiler and distributed in strip-like intervals along the processing direction of the plate and strip. The adjustment area is a low-temperature area located in front of the laminar cooling system and distributed in strip-like intervals along the processing direction of the plate and strip.

[0067] It is understandable that the surface temperature loss model of the plate strip is generated according to the incoming material parameters and the laminar cooling system parameters. The incoming material parameters include the steel type of the plate strip, because different materials (such as carbon steel, alloy steel, stainless steel, etc.) have different thermal conductivity, specific heat capacity, density and other thermophysical properties, which will directly affect the heat transfer and temperature change. For example, the thermal conductivity of stainless steel is lower than that of carbon steel, and its temperature drop rate will be slower under the same cooling conditions; the initial temperature of the plate strip, accurately measure the initial temperature of the plate strip before entering the laminar cooling system, which is the starting point for the subsequent calculation of temperature loss. Different initial temperatures will result in different temperature change trajectories during the cooling process; the size specifications of the plate strip, master the size information such as the thickness, width and length of the plate strip. Thicker plates have greater heat capacity and the temperature drop is relatively slow during cooling; while wider and longer plates may have temperature differences between the edge and the center during the cooling process, and the influence of heat dissipation boundary conditions needs to be considered.

[0068] It is understandable that the parameters of the laminar cooling system include the location of the spray port and the water flow rate of the spray port. The cooling water flow rate determines the amount of coolant that exchanges heat with the surface of the plate and strip per unit time. The greater the flow rate and the higher the flow rate, the more heat is taken away and the faster the temperature of the plate and strip drops. The cooling water temperature is an important factor affecting the efficiency of heat exchange. The lower the water temperature, the greater the temperature difference with the plate and strip, the more intense the heat exchange, and the greater the temperature drop of the plate and strip. The location of the spray port affects the length and layout of the cooling zone.

[0069] It is understandable that for those skilled in the art, it is obvious to construct a mathematical model by inputting incoming material parameters and laminar cooling system parameters according to the basic theory of heat transfer, combining the heat conduction equation and the convection heat transfer model, and no further elaboration is given here.

[0070] It is understandable that the weighted coefficient is assigned to the strip surface temperature loss model to calibrate the strip surface temperature loss model and determine the heating demand of the heating position. The weighted coefficient is determined based on regional differences. If it is found that the error index of a certain area of ​​the strip (for example, the edge area in the width direction, due to the faster heat dissipation, the actual temperature drop is often more obvious than the model prediction) is significantly higher than that of other areas, it is necessary to assign a larger weighted coefficient to this area so that the model pays more attention to the deviation of this area during the calibration process. For example, the strip is divided into three areas along the width direction: the left edge area, the middle area, and the right edge area. After analysis and calculation, the average absolute error of the left edge area is 8℃, the middle area is 3℃, and the right edge area is 6℃. In order to highlight the correction of the area with large deviation, the weighted coefficient can be assigned to the left edge area 0.4, the middle area 0.2, and the right edge area 0.4. Of course, the specific value of the weighted coefficient can be determined based on experience, multiple test adjustments, or combined with more complex data analysis methods (such as correlation analysis based on error and regional characteristics).

[0071] Specifically, the comparison unit compares the absolute value of each first temperature difference with the first preset temperature difference, and assigns a weighted coefficient to the strip surface temperature loss model according to the comparison result to calibrate the strip surface temperature loss model, wherein:

[0072] If the absolute value of the first temperature difference is greater than the first preset temperature difference, a weighted coefficient is assigned to the strip surface temperature loss model to calibrate the strip surface temperature loss model;

[0073] In implementation, the first preset temperature difference is 5°C. If the absolute value of the first temperature difference is 10°C, which is greater than the first preset temperature difference of 5°C, a weighted coefficient is assigned to the strip surface temperature loss model to calibrate the strip surface temperature loss model.

[0074] The first preset temperature difference is related to the initial temperature and the water flow rate of the spray nozzle.

[0075] It can be understood that the initial temperature is the starting temperature state of the plate before entering the laminar cooling system, which directly determines the temperature difference between the plate and the cooling medium (spray water) at the beginning of cooling. According to the basic principle of heat transfer, the temperature difference is the driving force of heat transfer. The larger the temperature difference, the faster the heat transfer rate is usually. Under the same spraying conditions, the temperature drop of the plate will be greater; for example, when the initial temperature of the plate is high, such as reaching 800°C, there is a large temperature difference (780°C) between it and the spray water (assuming the water temperature is 20°C). After entering the laminar cooling system, heat will be quickly transferred from the plate to the spray water, causing the temperature of the plate to drop rapidly in a short time. The first preset temperature difference can be selected as 10°C. If the initial temperature of the plate is relatively low, such as 300°C, the temperature difference with the spray water is only 280°C. Under the same spray water flow and other cooling conditions, the rate and amplitude of temperature drop will be relatively small. The first preset temperature difference can be selected as 5°C.

[0076] It can be understood that the water flow rate of the spray nozzle is one of the key parameters affecting the cooling effect in the laminar cooling system. From the perspective of heat exchange, a larger water flow rate means that more coolant contacts the surface of the plate and participates in heat exchange per unit time, which can take away more heat, thereby causing the temperature of the plate to drop faster and to a greater extent. When other conditions remain unchanged, an increase in water flow will increase the convective heat transfer coefficient, because more water participates in the flow and heat exchange, which enhances factors such as fluid disturbance, thereby increasing the amount of heat exchange and rapidly reducing the temperature of the plate. When setting the first preset temperature difference, the water flow rate of the spray nozzle is a factor that must be considered. If the water flow rate of the spray nozzle is large, due to its strong cooling capacity, a large temperature reduction can be achieved. Therefore, within the range allowed by the process, the first preset temperature difference can be set larger according to the desired final temperature. On the contrary, when the water flow rate of the spray nozzle is small, the cooling effect is limited. In order to ensure product quality and meet subsequent process requirements, the first preset temperature difference should be set smaller to prevent insufficient cooling. For example, for the cooling process of a certain aluminum alloy plate, if the spray nozzle water flow rate has a large adjustable range, when a high water flow rate (such as 15m 3 / h), the first preset temperature difference is set to 10°C; and when a lower water flow rate (such as 5m / h) can only be used due to equipment limitations and other reasons 3 / h), the first preset temperature difference is adjusted to about 5°C.

[0077] See also Figure 2 As shown, it is a schematic diagram of the positions of the strip area and the adjustment area in an embodiment of the present invention. The comparison unit determines the temperature increase requirement of the heating position after completing the calibration of the surface temperature loss model of the plate strip, wherein:

[0078] Calculate the calibration temperature value of each strip area in the calibrated strip surface temperature loss model.

[0079] The maximum value of the calibration temperature is selected, and the calibration temperature difference between the maximum value of the calibration temperature and the remaining calibration temperatures is calculated to determine the temperature increase requirement of each strip area.

[0080] Specifically, the adjustment unit drives the induction heater to the heating position according to the calibrated strip surface temperature loss model, wherein:

[0081] The adjustment unit selects the preset number of heating requirements from large to small.

[0082] Set the bar area corresponding to the heating demand as the heating position.

[0083] Drive the induction heater to the heating position,

[0084] The preset number is less than or equal to the number of induction heaters.

[0085] Specifically, the adjustment unit adjusts the heating power of the induction heater according to the temperature increase requirement, wherein:

[0086] If the calibration temperature difference is less than the maximum temperature rise capacity of the induction heater, driving the single induction heater to the heating position and determining the power of the induction heater according to the calibration temperature difference;

[0087] If the calibration temperature difference is greater than or equal to the maximum temperature rise capacity of the induction heater, the number of induction heaters and the power of each induction heater are determined according to the calibration temperature difference;

[0088] The maximum temperature rise capacity of the induction heater is the maximum temperature value that the strip can be raised to after passing through the induction heater.

[0089] In implementation, the maximum temperature rise capacity of the induction heater is 200°C. If the calibration temperature difference is 154°C, which is less than the maximum temperature rise capacity of the induction heater, the single induction heater is driven to the heating position and the power of the induction heater is determined according to the calibration temperature difference.

[0090] If the calibration temperature difference is 356°C, which is greater than the maximum temperature rise capacity of the induction heater, the two induction heaters are driven to the heating position, and one induction heater is set to open at maximum power, and the other induction heater is set to have a temperature rise capacity of 156°C.

[0091] Specifically, the analysis unit compares the absolute value of each second temperature difference with the second preset temperature difference, and determines whether to output the adjustment information according to the comparison result, wherein:

[0092] If the absolute value of the second temperature difference is greater than the second preset temperature difference, determining and outputting adjustment information;

[0093] In implementation, the second preset temperature difference is 10°C, and if the absolute value of the second temperature difference is 20°C, which is greater than the second preset temperature difference of 10°C, it is determined that the adjustment information is output;

[0094] The second preset temperature difference is related to the heating power of the induction heater and the water flow rate of the spray nozzle, and the adjustment information includes moving the position of the induction heater and increasing / decreasing the heating power.

[0095] It can be understood that the heating power of the induction heater determines the amount of heat input to the plate and strip per unit time. When the heating power increases, more electrical energy will be converted into heat energy and transferred to the plate and strip within the same time interval, causing the temperature of the plate and strip to rise more significantly. In the case of large temperature changes, the second preset temperature difference will become larger. When the heating power is constant, increasing the water flow rate of the spray nozzle will accelerate the cooling speed of the plate and strip, increase the temperature drop, and in the case of large temperature changes, the second preset temperature difference will also increase.

[0096] See also Figure 3 As shown, it is a flow chart of determining output adjustment information in an embodiment of the present invention. When determining to output adjustment information, the analyzing unit outputs corresponding adjustment information according to the second temperature difference value that triggers the determination, wherein:

[0097] If the second temperature difference is a negative value, output adjustment information for increasing the heating power;

[0098] If the second temperature difference is a positive value, adjustment information for reducing the heating power is output.

[0099] Specifically, the analyzing unit outputs adjustment information of the position of the mobile induction heater according to the second temperature difference value triggering the determination in the state of determining to output the adjustment information, wherein:

[0100] If the second temperature difference is a positive value and its absolute value is greater than the third preset temperature difference, then outputting adjustment information of a single induction heater moved out of the adjustment area corresponding to the second temperature difference;

[0101] If the second temperature difference is a negative value and its absolute value is greater than the third preset temperature difference, then output adjustment information for moving a single induction heater into the adjustment area corresponding to the second temperature difference;

[0102] In implementation, the third preset temperature difference is 20°C, and if the second temperature difference is 35°C, which is a positive value and the absolute value is greater than the third preset temperature difference, then the adjustment information of the single induction heater in the adjustment area corresponding to the second temperature difference is output;

[0103] If the second temperature difference is -25°C, which is a negative value and the absolute value is greater than the third preset temperature difference, then adjustment information for moving a single induction heater into the adjustment area corresponding to the second temperature difference is output.

[0104] The absolute value of the third preset temperature difference is greater than the absolute value of the second preset temperature difference and is related to the heating power of the induction heater and the water flow rate of the spray nozzle.

[0105] It can be understood that the heating power of the induction heater determines the amount of heat input to the plate and strip per unit time. When the heating power increases, more electrical energy will be converted into heat energy and transferred to the plate and strip within the same time interval, causing the temperature of the plate and strip to rise more significantly. In the case of large temperature changes, the third preset temperature difference will become larger. When the heating power is constant, increasing the water flow rate of the spray nozzle will accelerate the cooling speed of the plate and strip, increase the temperature drop, and in the case of large temperature changes, the third preset temperature difference will also increase.

[0106] Specifically, when the adjustment unit receives the adjustment information for moving the single induction heater out of the adjustment area corresponding to the second temperature difference, if there is only a single induction heater in the adjustment area corresponding to the second temperature difference, the heating power of the induction heater is reduced.

[0107] Specifically, when the adjustment unit receives adjustment information for moving a single induction heater into the adjustment area corresponding to the second temperature difference, if there is no idle induction heater, the water flow rate of the spray nozzle corresponding to the second temperature difference is reduced.

[0108] Please cooperate Figure 2 See also Figure 4 As shown, it is a working flow chart of the intelligent temperature control system of an embodiment of the present invention. During the processing, the plate strip 1 passes through the casting roller 2, the hot rolling roller 3, the induction heater 4, the laminar cooling system 5 and the coiler 6 in sequence; the center line 7 of the low-temperature area is simulated along the full length of the plate strip 1, the strip area 8 is located between the laminar cooling system 5 and the coiler 6, and the adjustment area 9 is located between the hot rolling roller 3 and the laminar cooling system 5.

[0109] During implementation, a plate surface temperature loss model is generated by combining the incoming material parameters and the laminar cooling system parameters, and the simulated temperature of the plate surface temperature loss model is calculated. The first measured temperature and the simulated temperature are subtracted to obtain a first temperature difference and the temperature difference is compared with the first preset temperature difference. If the first temperature difference is not less than the first preset temperature difference, a weighted coefficient is assigned to the plate surface temperature loss model and the simulated temperature is recalculated until the first temperature difference is less than the first preset temperature difference. The induction heater is turned on and moved to the heating position. The heating power is set according to the heating demand. The second measured average temperature and the measured temperature value of each strip area are subtracted to obtain a second temperature difference of each strip area and the temperature difference is compared with the second preset temperature difference. If the second temperature difference is not less than the second preset temperature difference, the analysis unit outputs adjustment information to the adjustment unit to adjust the heating position and heating power of the induction heater, as well as the water flow rate of the spray nozzle.

[0110] It can be understood that the induction heater can move up and down perpendicular to the plate strip, and three working states, namely, working position, waiting position and non-working position, can be adjusted by changing the distance between the plate strip and the induction heater.

[0111] Optionally, the non-working position is about 2-3m away from the plate, the waiting position is about 1-2m away, and the working position is about 10-50mm away.

[0112] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent temperature control system for ultra-thin strips, characterized in that: include: A plurality of induction heaters are arranged in the adjustment area to heat the plate strip; A scanning unit, which is used to collect the temperature values ​​of each strip area at a preset position of the plate before and after the induction heater is turned on, and respectively generate a first measured temperature and a second measured temperature of each strip area, and calculate the second measured average temperature of each strip area; A modeling unit, which is used to generate a plate strip surface temperature loss model according to incoming material parameters and laminar cooling system parameters, and calculate a simulated temperature of the plate strip surface temperature loss model; The incoming material parameters include the steel type, specification and size of the strip and the initial temperature of the strip before entering the laminar cooling system, and the laminar cooling system parameters include the spray port position and the spray port water flow rate; a comparison unit, which is connected to the scanning unit and the modeling unit respectively, and is used for receiving the first measured temperature and the simulated temperature of each of the strip areas and performing a difference to obtain a first temperature difference of each of the strip areas, and comparing the absolute value of each of the first temperature difference with a first preset temperature difference, and assigning a weighted coefficient to the strip surface temperature loss model according to the comparison result to calibrate the strip surface temperature loss model and determine the heating requirement of the heating position; an analyzing unit connected to the scanning unit, for receiving and respectively calculating the difference between each second measured temperature and the second measured average temperature when the induction heater is turned on, obtaining the second temperature difference of each strip area, and comparing the absolute value of each second temperature difference with the second preset temperature difference, and outputting adjustment information according to the comparison result combined with the size of the second temperature difference; an adjustment unit, which is connected to the comparison unit, the analysis unit and the induction heater respectively, and is used to drive the induction heater to a heating position according to the calibrated strip surface temperature loss model and adjust the heating power of the induction heater according to the heating demand, and receive the adjustment information to adjust the heating position and the heating power when the induction heater is turned on; The preset position includes a plurality of the strip areas and is located at any position between the laminar cooling system and the coiler. The strip areas are low-temperature areas that are distributed in strips between the laminar cooling system and the coiler along the processing direction of the plate and strip. The adjustment area is a low-temperature area that is distributed in strips in front of the laminar cooling system along the processing direction of the plate and strip.

2. The intelligent temperature control system for ultra-thin strip according to claim 1, characterized in that: The comparison unit compares the absolute value of each of the first temperature difference values ​​with the first preset temperature difference, and assigns a weighted coefficient to the strip surface temperature loss model according to the comparison result to calibrate the strip surface temperature loss model, wherein: If the absolute value of the first temperature difference is greater than the first preset temperature difference, a weighted coefficient is assigned to the strip surface temperature loss model to calibrate the strip surface temperature loss model; Wherein, the first preset temperature difference is related to the initial temperature and the water flow rate of the spray nozzle.

3. The intelligent temperature control system for ultra-thin strip according to claim 2 is characterized in that: The comparison unit determines the temperature increase requirement of the heating position after completing the calibration of the strip surface temperature loss model, wherein: Calculating the calibration temperature value of each strip area in the calibrated strip surface temperature loss model, The maximum value of the calibration temperature is selected, and the calibration temperature difference between the maximum value of the calibration temperature and the remaining calibration temperatures is calculated to determine the temperature increase requirement of each of the strip-shaped areas.

4. The intelligent temperature control system for ultra-thin strip according to claim 3 is characterized in that: The adjustment unit drives the induction heater to the heating position according to the calibrated strip surface temperature loss model, wherein: The adjustment unit selects a preset number of the heating requirements from large to small, Set the strip area corresponding to the heating demand as the heating position, driving the induction heater to the heating position, The preset number is less than or equal to the number of the induction heaters.

5. The intelligent temperature control system for ultra-thin strip according to claim 4, characterized in that: The adjustment unit adjusts the heating power of the induction heater according to the temperature increase requirement, wherein: If the calibration temperature difference is less than the maximum temperature rise capacity of the induction heater, driving the single induction heater to the heating position and determining the power of the induction heater according to the calibration temperature difference; If the calibration temperature difference is greater than or equal to the maximum temperature rise capacity of the induction heater, determining the number of the induction heaters and the power of each of the induction heaters according to the calibration temperature difference; The maximum temperature rise capacity of the induction heater is the maximum temperature value that the strip can be raised to after passing through the induction heater.

6. The intelligent temperature control system for ultra-thin strip according to claim 5, characterized in that: The analyzing unit compares the absolute value of each of the second temperature difference values ​​with the second preset temperature difference value, and determines whether to output the adjustment information according to the comparison result, wherein: If the absolute value of the second temperature difference is greater than the second preset temperature difference, determining to output the adjustment information; The second preset temperature difference is related to the heating power of the induction heater and the water flow rate of the spray nozzle, and the adjustment information includes moving the position of the induction heater and increasing / decreasing the heating power.

7. The intelligent temperature control system for ultra-thin strip according to claim 6, characterized in that: The analyzing unit outputs the corresponding adjustment information according to the second temperature difference value that triggers the determination, when determining to output the adjustment information, wherein: If the second temperature difference is a negative value, outputting the adjustment information for increasing the heating power; If the second temperature difference is a positive value, the adjustment information for reducing the heating power is output.

8. The intelligent temperature control system for ultra-thin strip according to claim 7, characterized in that: The analyzing unit outputs the adjustment information for moving the position of the induction heater according to the second temperature difference value that triggers the determination, when determining to output the adjustment information, wherein: If the second temperature difference is a positive value and its absolute value is greater than a third preset temperature difference, outputting the adjustment information of the single induction heater in the adjustment area corresponding to the second temperature difference; If the second temperature difference is a negative value and its absolute value is greater than the third preset temperature difference, then outputting the adjustment information of moving a single induction heater into the adjustment area corresponding to the second temperature difference; The absolute value of the third preset temperature difference is greater than the absolute value of the second preset temperature difference and is related to the heating power of the induction heater and the water flow rate of the spray nozzle.

9. The intelligent temperature control system for ultra-thin strip according to claim 8, characterized in that: When the adjustment unit receives the adjustment information for removing the single induction heater from the adjustment area corresponding to the second temperature difference, if there is only the single induction heater in the adjustment area corresponding to the second temperature difference, the heating power of the induction heater is reduced.

10. The intelligent temperature control system for ultra-thin strip according to claim 9, characterized in that: When the adjustment unit receives the adjustment information of moving a single induction heater into the adjustment area corresponding to the second temperature difference, if there is no idle induction heater, the water flow rate of the spray outlet corresponding to the second temperature difference is reduced.

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