An intelligent temperature control system for ultra-thin strips

Abstract

The present 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, the system comprising: a plurality of induction heaters; a scanning unit for collecting the temperature at a preset position of the strip; a modeling unit for generating a surface temperature loss model of the strip, and calculating a simulated temperature of the surface temperature loss model of the strip; a comparison unit for determining the heating requirement of the heating position; an analysis unit for outputting adjustment information when the induction heater is turned on; an adjustment unit for driving the induction heater to the heating position and adjusting the heating power of the induction heater according to the heating requirement, and receiving adjustment information to adjust the heating position and heating power; the system of the present invention utilizes the method of setting the above-mentioned devices to accurately perform temperature control, reduce energy consumption, reduce strip defects caused by uneven temperature, and further improve the accuracy of the intelligent temperature control system for ultra-thin strips.

Description

Technical Field

[0001] The present 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 casting achieves a shortened casting and rolling process by replacing cold casting with hot casting. Thin strip casting is a continuous steel casting technology that addresses the challenges of traditional thin-gauge steel processing technologies, including high energy consumption, complex processes, long production cycles, and difficulty in converting production lines. It offers advantages such as a shorter process, fewer steps, lower energy consumption, reduced emissions, and environmental friendliness. The thin strip casting process involves injecting molten steel directly between a pair of counter-rotating casting rollers. The molten steel then passes through the rollers and is cast directly into a cast strip. The thin strip is then conveyed to the rolling mill via guide rollers and pinch rolls. After being rolled to the target thickness, it is cooled to the target temperature via a laminar cooling system and then coiled on a coiler. Currently, due to the high production speeds of thin strip casting and the unevenness of the strip, spray water from the laminar cooling system can accumulate on the strip, forming cold zones. Furthermore, varying spray water configurations can result in different cold zones along the casting direction for different strip specifications, with the size and location of these cold zones varying randomly. Conventional control methods include reducing production speed, extending rolling lines, adjusting water spraying methods, and increasing strip temperature, but none of these methods can fundamentally solve the problem of temperature uniformity. Moreover, these control methods also affect production efficiency and increase production costs.

[0003] Chinese patent application publication number CN118404021A discloses a process control optimization method for ultra-thin copper strip. This invention discloses a process control optimization method for ultra-thin copper strip. This method utilizes a copper liquid flow model and real-time cooling strategy to optimize the microstructure of ingots during continuous casting, ensuring uniform material properties. Based on historical data analysis, a customized heat treatment plan is developed for each batch of ingots. Integrated sensors and a monitoring system automatically adjust heat treatment conditions to achieve high efficiency, energy conservation, and environmental protection. During the cold rolling process, online thickness gauge data is collected to dynamically adjust pressure and speed to ensure uniform copper strip thickness. Finite element simulation and algorithms are used in the straightening process to optimize straightening force based on stress distribution. Real-time monitoring allows for selective local heating or mechanical stretching to effectively manage residual stress. Finally, the method integrates Internet of Things technology to comprehensively collect production data, establish a big data analysis platform, continuously learn and optimize production models, and drive iterative upgrades of process parameters, achieving a comprehensive goal from material microstructure control to final product quality assurance.

[0004] Chinese patent application publication number: CN116571564A discloses a flexible rolling method for integrated control of macro- and micro-shapes of plates and strips. The invention provides a flexible rolling method for integrated control of macro- and micro-shapes of plates and strips, which belongs to the field of iron and steel metallurgy. The invention reconstructs 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 furnaces, reversible roughing mills, induction heating devices, and nozzle cooling devices, ensures that the temperature of the edge of the rollers 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 macro-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, and makes full use of the latest process equipment to give full play to the characteristics of each process to realize integrated control of the shape of the plate and strip throughout the entire process.

[0005] However, the above method has the following problems: it does not consider the local effect of the spraying of cooling water on the temperature of the strip, does not accurately monitor the temperature change of the strip, and cannot accurately heat the strip. 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 impact of cooling water spraying on the strip temperature is not considered, the temperature changes of the strip are not accurately monitored, and the strip cannot be accurately heated.

[0007] To achieve the above objectives, 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 for collecting temperature values ​​of each strip area at a preset position of the plate before and after the induction heater is turned on, generating a first measured temperature and a second measured temperature of each strip area, and calculating a second measured average temperature of each strip area;

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

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

[0012] a comparing unit, connected to the scanning unit and the modeling unit, respectively, for receiving the first measured temperature and the simulated temperature of each strip area and performing a difference therebetween to obtain a first temperature difference value of each strip area, and comparing the absolute value of each first temperature difference value with a first preset temperature difference value, assigning a weighting coefficient to the strip surface temperature loss model according to the comparison result, calibrating the strip surface temperature loss model, and determining a temperature increase requirement of the heating position;

[0013] an analyzing unit connected to the scanning unit, configured to receive and respectively calculate the difference between each second measured temperature and the second measured average temperature when the induction heater is turned on, to obtain a second temperature difference for each of the strip-shaped areas, compare an absolute value of each second temperature difference with a second preset temperature difference, and output adjustment information based on the comparison result and the magnitude of the second temperature difference;

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

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

[0016] Furthermore, the comparison unit compares the absolute value of each of the first temperature differences 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:

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

[0018] 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 strip area.

[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 temperature increase requirements from large to small,

[0024] Set the strip area corresponding to the heating requirement 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 capability 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] Furthermore, 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:

[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 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:

[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] Furthermore, 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:

[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, outputting the adjustment information for 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 of 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, it reduces the water flow rate of the spray nozzle corresponding to the second temperature difference.

[0043] Compared with the prior art, the beneficial effect of the present invention is that the system of the present invention preheats the areas with high temperature drop after the plate and strip pass through the laminar cooling system by setting up several induction heaters, which can improve the internal stress distribution of the plate and strip. 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, improve production efficiency, and 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 analyzes the input parameters through the modeling unit to generate a plate and strip surface temperature loss model, and adjusts the plate and strip surface temperature loss model by collecting the actual measured temperature after passing through the laminar cooling system, thereby improving 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 collected after passing through the laminar cooling system, the plate and strip surface temperature loss model is assigned a weighted coefficient to adjust the model. After the model is adjusted, the plate and strip surface temperature loss 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 the temperature and analyzes the plate and strip passing through the laminar cooling system after the induction heater is turned on, 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 enable the plate and strip to achieve 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 precisely control temperature by reducing the heating power of a single induction heater and the water flow rate of the corresponding spray nozzle in response to the situations where only a single induction heater is present in a single adjustment area and when all induction heaters are in operation. This precise control helps produce products with higher quality and more uniform performance. For metal products, it can ensure that 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 company's production costs but also helps save energy and reduce emissions. In the long run, for large-scale production companies, the energy cost savings are significant. At the same time, the extended service life of the equipment means a reduced frequency of equipment repair and replacement, reduced equipment maintenance costs, improved equipment reliability and production continuity, and further enhanced the accuracy and practicality of the intelligent temperature control system for ultra-thin plates and strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 Schematic diagram of the structure of the intelligent temperature control system for ultra-thin strips of the present invention;

[0048] Figure 2 This is 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 flowchart for determining output 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 merely used to explain the present invention and are not intended 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 scope of protection 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 accompanying drawings. This is only 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] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0056] See also Figure 1 As shown, it is a structural schematic diagram of the 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 strip;

[0058] a scanning unit for collecting temperature values ​​of each strip area at a preset position of the plate before and after the induction heater is turned on, generating a first measured temperature and a second measured temperature of each strip area, and calculating a 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 strip surface temperature loss model based on incoming material parameters and laminar cooling system parameters, and calculate a simulated temperature of the 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 this 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 conform to 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, specifications and dimensions 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 spray port water flow rate.

[0063] a comparison unit, connected to the scanning unit and the modeling unit, respectively, for receiving the first measured temperature and the simulated temperature of each strip area and performing a difference to obtain a first temperature difference value of each strip area, and comparing the absolute value of each first temperature difference value with a first preset temperature difference value, assigning a weighted coefficient to the strip surface temperature loss model based on the comparison result, calibrating the strip surface temperature loss model, and determining the temperature increase requirement of the heating position;

[0064] an analyzing unit connected to the scanning unit, configured to receive and calculate, when the induction heater is turned on, the difference between each second measured temperature and the second measured average temperature to obtain the second temperature difference for each strip area, compare the absolute value of each second temperature difference with the second preset temperature difference, and output adjustment information based on the comparison result and the magnitude 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 plate and strip processing direction. The adjustment area is a low-temperature area located in front of the laminar cooling system and distributed in strip-like intervals along the plate and strip processing direction.

[0067] It's understandable that the strip surface temperature loss model is generated based on the incoming material parameters and laminar cooling system parameters. The incoming material parameters include the steel grade of the strip. Different materials (such as carbon steel, alloy steel, and stainless steel) have different thermophysical properties, such as thermal conductivity, specific heat capacity, and density, which directly affect heat transfer and temperature changes. For example, stainless steel has a lower thermal conductivity than carbon steel, resulting in a slower temperature drop under the same cooling conditions. The strip's initial temperature is precisely measured before entering the laminar cooling system, serving as the starting point for subsequent temperature loss calculations. Different initial temperatures result in different temperature variations during the cooling process. The strip's dimensions, such as thickness, width, and length, are also determined. Thicker strips have greater heat capacity and cool more slowly during cooling. Wider and longer strips, on the other hand, may experience temperature differences between their edges and center during cooling, necessitating consideration of the impact of heat dissipation boundary conditions.

[0068] It's understood that laminar cooling system parameters include spray nozzle location and spray nozzle water flow rate. The cooling water flow rate determines the amount of coolant that exchanges heat with the strip surface per unit time. The greater the flow rate and the higher the flow rate, the more heat is removed, and the faster the strip temperature drops. Cooling water temperature is a key factor influencing heat exchange efficiency. The lower the water temperature, the greater the temperature difference with the strip, the more intense the heat exchange, and the greater the drop in strip temperature. Spray nozzle location influences 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 based on the basic theory of heat transfer, combining the heat conduction equation and the convection heat transfer model, inputting the incoming material parameters and the laminar cooling system parameters, and no further details will be given here.

[0070] It is understood that weighting coefficients are assigned to the strip surface temperature loss model to calibrate the model and determine the required temperature rise at the heating location. Weighting coefficients are determined based on regional differences. If the error index for a specific region of the strip (e.g., the edge region along the width, where the actual temperature drop is often more significant than the model prediction due to rapid heat dissipation) is significantly higher than that of other regions, a larger weighting coefficient should be assigned to this region so that the model pays more attention to the deviation in this region during the calibration process. For example, the strip is divided into three regions along the width: the left edge, the middle, and the right edge. Analysis and calculation show that the mean absolute error for the left edge is 8°C, the middle is 3°C, and the right edge is 6°C. To prioritize the correction of regions with large deviations, weighting coefficients of 0.4 for the left edge, 0.2 for the middle, and 0.4 for the right edge can be assigned. The specific values ​​of the weighting coefficients can be determined based on experience, multiple experiments, 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 is understood that the initial temperature is the starting temperature of the strip before it enters the laminar cooling system. It directly determines the temperature difference between the strip and the cooling medium (spray water) at the start of cooling. According to the basic principles of heat transfer, the temperature difference is the driving force of heat transfer. The larger the temperature difference, the faster the heat transfer rate. Under the same spraying conditions, the greater the temperature drop of the strip temperature. For example, when the initial strip temperature is high, such as 800°C, there is a large temperature difference (780°C) between the strip and the spray water (assuming the water temperature is 20°C). After entering the laminar cooling system, heat will be rapidly transferred from the strip to the spray water, causing the strip temperature to drop rapidly in a short period of time. The first preset temperature difference can be selected as 10°C. If the initial strip temperature is relatively low, such as 300°C, the temperature difference with the spray water is only 280°C. Under the same spray water flow rate and other cooling conditions, the rate and magnitude 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 strip surface and participates in heat exchange per unit time, which can take away more heat, thereby causing the strip temperature to drop faster and to a greater extent. Under the condition that other conditions remain unchanged, the increase in water flow rate 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 heat exchange amount and rapidly reducing the strip temperature. When setting the first preset temperature difference, the spray nozzle water flow rate is a factor that must be considered. If the spray nozzle water flow rate is large, due to its strong cooling capacity, it can achieve a large temperature reduction. 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 spray nozzle water flow rate 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 a cooling process of a certain aluminum alloy strip, 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 according to an embodiment of the present invention. The comparison unit determines the temperature increase requirement of the heating position after completing the calibration of the strip surface temperature loss model, 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 capability of the induction heater, driving the single induction heater to a 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 capability 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 when passing through the induction heater.

[0089] In implementation, the maximum temperature rise capability of the induction heater is 200°C. If the calibration temperature difference is 154°C, which is less than the maximum temperature rise capability of the induction heater, the single induction heater is driven to a 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 be turned on 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, outputting the adjustment information;

[0093] In an 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 strip per unit time. When the heating power increases, more electrical energy will be converted into heat energy and transferred to the strip within the same time interval, causing the temperature of the 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 strip and increase the temperature drop. 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 according to an embodiment of the present invention. When determining output adjustment information, the analyzing unit outputs corresponding adjustment information according to the second temperature difference value that triggers the determination.

[0097] If the second temperature difference is a negative value, outputting 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, when the analysis unit determines to output the adjustment information, the analysis unit outputs the adjustment information of the position of the mobile induction heater according to the second temperature difference value that triggers the determination, wherein:

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

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

[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, and increase the temperature drop. In the case of large temperature changes, the third preset temperature difference will also increase.

[0106] Specifically, upon receiving the adjustment information for removing the single induction heater from the adjustment area corresponding to the second temperature difference, the adjustment unit reduces the heating power of the induction heater if there is only a single induction heater in the adjustment area corresponding to the second temperature difference.

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

[0108] Please cooperate Figure 2 See 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 strip 1 passes through the casting roll 2, the hot rolling roll 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 entire length of the 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 roll 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 and strip, and can be adjusted to three working states by changing the distance between the induction heater and the plate and strip, namely the working position, the waiting position and the non-working position.

[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] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0113] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection 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 strip; a scanning unit for collecting temperature values ​​of each strip area at a preset position of the plate before and after the induction heater is turned on, generating a first measured temperature and a second measured temperature of each strip area, and calculating a second measured average temperature of each strip area; A modeling unit, which is used to generate a strip surface temperature loss model based on incoming material parameters and laminar cooling system parameters, and calculate a simulated temperature of the strip surface temperature loss model; The incoming material parameters include the steel type, specifications and dimensions of the strip and the initial temperature of the strip before entering the laminar cooling system. The laminar cooling system parameters include the spray port position and spray port water flow rate. a comparing unit, connected to the scanning unit and the modeling unit, respectively, for receiving the first measured temperature and the simulated temperature of each strip area and performing a difference to obtain a first temperature difference value of each strip area, and comparing the absolute value of each first temperature difference value with a first preset temperature difference value, assigning a weighting coefficient to the strip surface temperature loss model according to the comparison result, calibrating the strip surface temperature loss model, and determining a temperature increase requirement at a heating position; an analyzing unit connected to the scanning unit, configured to receive and respectively calculate the difference between each second measured temperature and the second measured average temperature when the induction heater is turned on, to obtain a second temperature difference for each of the strip-shaped areas, compare an absolute value of each second temperature difference with a second preset temperature difference, and output adjustment information based on the comparison result and the magnitude of the second temperature difference; an adjustment unit, connected to the comparison unit, the analysis unit, and the induction heater, respectively, for driving the induction heater to a heating position according to the calibrated strip surface temperature loss model and adjusting the heating power of the induction heater according to the heating demand, and receiving the adjustment information to adjust the heating position and the heating power when the induction heater is turned on; The preset position includes several strip areas and is located at any position between the laminar cooling system and the coiler. The strip areas are low-temperature areas located between the laminar cooling system and the coiler and are distributed in strips along the plate and strip processing direction. The adjustment area is a low-temperature area located in front of the laminar cooling system and is distributed in strips along the plate and strip processing direction.

2. The intelligent temperature control system for ultra-thin strips according to claim 1, characterized in that: The comparison unit compares the absolute value of each of the first temperature differences 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, assigning a weighting coefficient to the strip surface temperature loss model to calibrate the strip surface temperature loss model; 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 strips according to claim 2, 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 strip area.

4. The intelligent temperature control system for ultra-thin strips according to claim 3, 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 temperature increase requirements from large to small, Set the strip area corresponding to the heating requirement 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 strips 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 capability 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 strips according to claim 5, characterized in that: The analyzing 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: If the absolute value of the second temperature difference is greater than the second preset temperature difference, determining and outputting 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 strips 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 strips 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 in a state where the adjustment information is determined to be output, 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, outputting the adjustment information for 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 strips 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 adjustment unit reduces the heating power of the induction heater.

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

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