Strip steel continuous annealing plate temperature transition control method and device

Abstract

The invention provides a strip steel continuous annealing plate temperature transition control method and device, and the method comprises the steps: determining a control strategy and a strip steel temperature control range according to the control demands of front and back strip steel, and determining a main coil and a secondary coil in the strip steel continuous annealing according to the control strategy; a relation model and an iteration model of the furnace temperature and the plate temperature are constructed through a mechanism model and empirical parameters; according to the relation model, the iteration model and the strip steel temperature control range, through at least two times of model trial calculation, a plate temperature target of a front coil of strip steel, a plate temperature target of a rear coil of strip steel and a plate temperature target in a transition process in the front and rear strip steel control process are obtained; and corresponding control parameters are issued according to the plate temperature target to control plate temperature transition of strip steel continuous annealing. According to the method, the plate temperature control parameters in the transition process can be calculated, the control precision and the control speed are improved, and transition control over dynamic specification changing of the plate temperature in the continuous annealing process is achieved.

Description

Technical Field

[0001] The invention relates to the field of metallurgical technology, and in particular to a method and device for controlling temperature transition of a strip steel continuous evacuation. Background Art

[0002] As one of the cold-rolled products with wide applications and high production quality requirements, improving its product quality has always been a research hotspot. The main production process of cold-rolled strip steel includes cold rolling, pickling, galvanizing, annealing and other processes. Continuous annealing (continuous annealing) is one of the important links in the production process of cold-rolled strip steel. Annealing can effectively improve the product quality of strip steel.

[0003] With the popularization and application of continuous annealing furnaces, and the continuous improvement of downstream product quality requirements, the dynamic temperature change transition control of the plate specification has gradually become an indispensable part of the continuous annealing production line. At the same time, the traditional plate temperature closed-loop method is affected by the measurement error of the plate temperature meter. How to achieve a dynamic temperature change transition control that does not rely on the plate temperature meter has become a direction worthy of research. Summary of the invention

[0004] In view of this, the present invention provides a method and device for controlling the temperature transition of a strip during continuous strip withdrawal to solve at least one of the above-mentioned problems.

[0005] In order to achieve the above object, the present invention adopts the following scheme:

[0006] A method for controlling plate temperature transition during continuous strip retreating specifically comprises: determining a control strategy and a strip temperature control range according to control requirements of front and rear strips, determining main coils and secondary coils in the continuous strip retreating according to the control strategy; constructing a relationship model and an iteration model between furnace temperature and plate temperature by using a mechanism model and empirical parameters, obtaining a plate temperature target of a front coil of the strip, a plate temperature target of a rear coil of the strip and a plate temperature target during the transition process during the control of the front and rear strips through at least two model trials according to the relationship model, the iteration model and the strip temperature control range; issuing corresponding control parameters according to the plate temperature target to control the plate temperature transition of the continuous strip retreating.

[0007] In the above-mentioned strip temperature transition control method during continuous strip retreat, optionally, the control strategy includes a pre-protection control mode and a post-protection control mode; the determination of the main coil and the secondary coil in the continuous strip retreat according to the control strategy includes: when the control strategy is the pre-protection control mode, the main coil is the previous coil of strip steel, and the secondary coil is the next coil of strip steel; when the control strategy is the post-protection control mode, the main coil is the next coil of strip steel, and the secondary coil is the previous coil of strip steel.

[0008] In the above-mentioned strip temperature transition control method for continuous strip withdrawal, optionally, obtaining the plate temperature target of the front roll strip, the plate temperature target of the rear roll strip and the plate temperature target during the front and rear strip control process through at least two model trials according to the relationship model, the iterative model and the strip temperature control range includes: obtaining the furnace temperature parameters according to the relationship model and the target temperature of the main roll, and obtaining the plate temperature parameters of the secondary roll according to the furnace temperature parameters and the iterative model; judging the plate temperature parameters according to the strip temperature control range, adjusting the target temperature of the main roll according to the judgment result and recalculating the plate temperature parameters of the secondary roll; obtaining the plate temperature target of the front roll strip, the plate temperature target of the rear roll strip and the plate temperature target during the front and rear strip control process through analysis of the recalculated plate temperature parameters.

[0009] In the above-mentioned strip continuous retreat temperature transition control method, optionally, determining the plate temperature parameters according to the strip temperature control range includes: obtaining the upper limit temperature value, target temperature value and lower limit temperature value of the secondary coil according to the strip temperature control range; obtaining an adjustment strategy according to the comparison results of the plate temperature parameters with the upper limit temperature value, the target temperature value and the lower limit temperature value respectively; and obtaining a determination result according to the adjustment strategy.

[0010] In the above-mentioned strip continuous retreating temperature transition control method, optionally, the adjustment strategy includes: when the plate temperature parameter exceeds the upper limit temperature value, is equal to the upper limit temperature value, or is between the upper limit temperature value and the target temperature value, reducing the amount of heat provided by the heating furnace per unit time; when the plate temperature parameter is equal to the target temperature value, outputting the target temperature value; when the plate temperature parameter exceeds the lower limit temperature value, is equal to the lower limit temperature value, or is between the lower limit temperature value and the target temperature value, increasing the amount of heat provided by the heating furnace per unit time.

[0011] In the above-mentioned strip temperature transition control method for continuous strip retreat, optionally, obtaining the plate temperature target of the front roll strip, the plate temperature target of the rear roll strip and the plate temperature target during the transition process during the front and rear strip control process by analyzing the plate temperature parameters calculated again includes: obtaining the furnace temperature parameters by reducing the heat provided by the heating furnace per unit time or increasing the heat provided by the heating furnace per unit time, and obtaining the plate temperature parameters corresponding to the secondary roll according to the furnace temperature parameters and the iterative model; obtaining the plate temperature adjustment strategy according to the relationship between the plate temperature parameters and the target temperature value of the secondary roll; obtaining the plate temperature target of the front roll strip, the plate temperature target of the rear roll strip and the plate temperature target during the transition process during the front and rear strip control process according to the plate temperature adjustment strategy.

[0012] The present application also provides a strip temperature transition control device for continuous strip retreat, the device comprising: a mode setting unit, used to determine the control strategy and the strip temperature control range according to the control requirements of the front and rear strips, and determine the main coils and secondary coils in the continuous strip retreat according to the control strategy; an analysis unit, used to construct a relationship model and an iteration model between the furnace temperature and the plate temperature through a mechanism model and empirical parameters, and obtain the plate temperature target of the front roll strip, the plate temperature target of the rear roll strip and the plate temperature target in the transition process during the control of the front and rear strips through at least two model trials according to the relationship model, the iteration model and the strip temperature control range; a parameter issuing unit, used to issue corresponding control parameters according to the plate temperature target to control the plate temperature transition of the continuous strip retreat.

[0013] In the above-mentioned strip continuous retreat plate temperature transition control device, optionally, the control strategy includes a pre-protection control mode and a post-protection control mode; the mode setting unit determines the main coil and the secondary coil in the strip continuous retreat according to the control strategy, including: when the control strategy is the pre-protection control mode, the main coil is the previous coil of strip steel, and the secondary coil is the next coil of strip steel; when the control strategy is the post-protection control mode, the main coil is the next coil of strip steel, and the secondary coil is the previous coil of strip steel.

[0014] In the above-mentioned strip continuous retreat plate temperature transition control device, optionally, the analysis unit includes a trial calculation module, the trial calculation module is used to calculate the furnace temperature parameters according to the relationship model and the target temperature of the main coil, and calculate the plate temperature parameters of the secondary coil according to the furnace temperature parameters and the iterative model; the plate temperature parameters are judged according to the strip temperature control range, the target temperature of the main coil is adjusted according to the judgment result, and the plate temperature parameters of the secondary coil are calculated again; the plate temperature target of the front coil strip during the front and rear strip control process, the plate temperature target of the rear coil strip and the plate temperature target during the transition process are obtained by analyzing the recalculated plate temperature parameters.

[0015] In the above-mentioned strip continuous retreat temperature transition control device, optionally, the trial calculation module determines the plate temperature parameters according to the strip temperature control range, including: obtaining the upper limit temperature value, target temperature value and lower limit temperature value of the secondary coil according to the strip temperature control range; obtaining an adjustment strategy according to the comparison results of the plate temperature parameters with the upper limit temperature value, the target temperature value and the lower limit temperature value respectively; and obtaining a judgment result according to the adjustment strategy.

[0016] In the above-mentioned strip continuous retreat plate temperature transition control device, optionally, the trial calculation module obtains the plate temperature target of the front roll strip in the front and rear strip control process, the plate temperature target of the rear roll strip and the plate temperature target during the transition process by analyzing the plate temperature parameters calculated again, including: obtaining the furnace temperature parameters by reducing the heat provided by the heating furnace per unit time or increasing the heat provided by the heating furnace per unit time, and obtaining the plate temperature parameters corresponding to the secondary roll according to the furnace temperature parameters and the iterative model; obtaining the plate temperature adjustment strategy according to the relationship between the plate temperature parameters and the target temperature value of the secondary roll; obtaining the plate temperature target of the front roll strip in the front and rear strip control process, the plate temperature target of the rear roll strip and the plate temperature target during the transition process according to the plate temperature adjustment strategy.

[0017] It can be seen from the above technical solution that the present application calculates the corresponding furnace temperature control parameters of the plate temperature during the specification change transition process in advance, and issues the furnace temperature control parameters in advance, thereby improving the yield of the strip during the specification change transition process. Compared with the traditional plate temperature closed-loop control, the present application can eliminate the inaccurate control caused by inaccurate measurement of the plate temperature meter, and the control speed is improved to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0019] Figure 1 It is a flow chart of a method for controlling temperature transition of a strip steel continuous folding provided in an embodiment of the present application;

[0020] Figure 2 It is a schematic diagram of the board temperature target acquisition process provided in an embodiment of the present application;

[0021] Figure 3 It is a schematic diagram of the determination process provided in the embodiment of the present application;

[0022] Figure 4 It is a schematic diagram of the secondary trial calculation process provided by the embodiment of the present application;

[0023] Figure 5 It is a structural schematic diagram of a strip steel continuous folding plate temperature transition control device provided in an embodiment of the present application;

[0024] Figure 6 It is a schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0026] Please refer to Figure 1 As shown, the present application provides a method for controlling the temperature transition of a strip steel continuous evacuation, which specifically comprises:

[0027] S101 determines a control strategy and a temperature control range of the strip according to control requirements of the front and rear strips, and determines a main coil and a secondary coil in the strip continuous annealing according to the control strategy;

[0028] S102, using the mechanism model and the empirical parameters to construct a relationship model and an iteration model between the furnace temperature and the plate temperature, and obtaining the plate temperature target of the front roll strip steel, the plate temperature target of the rear roll strip steel and the plate temperature target in the transition process in the front and rear strip steel control process through at least two model trials according to the relationship model, the iteration model and the strip steel temperature control range;

[0029] S103 issues corresponding control parameters according to the plate temperature target to control the plate temperature transition of the strip steel in continuous retreat.

[0030] In the above embodiment, the control strategy may include a pre-protection control mode and a post-protection control mode; the determination of the main roll and the secondary roll in the strip steel continuous retreat according to the control strategy includes: when the control strategy is the pre-protection control mode, the main roll is the previous roll of strip steel, and the secondary roll is the next roll of strip steel; when the control strategy is the post-protection control mode, the main roll is the next roll of strip steel, and the secondary roll is the previous roll of strip steel. Among them, the pre-protection control mode focuses on ensuring the control accuracy of the previous roll. When the control system adjusts to the upper and lower limits of the previous roll, if the adjustment accuracy of the next roll is still not met, no adjustment will be made. (That is, in the subsequent calculation process, the pre-protection mode sets the front roll as the main protection position); the post-protection control mode focuses on ensuring the control accuracy of the next roll. When the control system adjusts to the upper and lower limits of the next roll, if the adjustment accuracy of the previous roll is still not met, no adjustment will be made. (That is, in the subsequent calculation process, the post-protection mode sets the back roll as the main protection position).

[0031] Please refer to Figure 2 As shown, in one embodiment of the present application, the plate temperature target of the front roll strip steel, the plate temperature target of the rear roll strip steel and the plate temperature target in the transition process are obtained by at least two model trials according to the relationship model, the iteration model and the strip temperature control range, including:

[0032] S201: calculating and obtaining furnace temperature parameters according to the relationship model and the target temperature of the main coil, and calculating and obtaining plate temperature parameters of the secondary coil according to the furnace temperature parameters and the iterative model;

[0033] S202 determines the plate temperature parameter according to the strip temperature control range, adjusts the target temperature of the primary coil according to the determination result, and recalculates the plate temperature parameter of the secondary coil;

[0034] S203 obtains the plate temperature target of the front coil steel, the plate temperature target of the rear coil steel and the plate temperature target during the transition process by analyzing the plate temperature parameters calculated again.

[0035] In this embodiment, the construction logic of the relationship model is as follows:

[0036] The heating and cooling stages in the heating furnace include radiation heat transfer and convection heat transfer. Based on this logic, the following relationship equation is constructed:

[0037]

[0038] In the above formula, Q f Indicates the energy exchanged due to radiation heat transfer, unit is kcal / hour; C L Indicates the combined radiation coefficient of the strip and heating furnace, kcal / m 2 ·Time·K 4 ; T g 、T b Indicates the average temperature of the strip heating furnace and the steel strip, in K; F g Indicates the working area of ​​the strip, in meters 2 ; dt is the time step, dimensionless. If there are 1000 compensations per second, then dt = 0.001 / 3600.

[0039] Q d =h·v 0.89 ·C0·(t g -t b )·F g (2)

[0040] In the above formula, Q d It represents the energy of heat exchange due to heat convection, in kcal / hour; η represents the protective gas correction factor, dimensionless; v represents the speed, the heating section is the strip speed, the cooling section is the cooling gas wind speed m / s; C0 equipment correction factor, for a certain characteristic production environment is a constant, dimensionless; t g ,t b Indicates the average temperature of the strip heating furnace and the steel strip, in °C; F g Indicates the working area of ​​the strip, in meters 2 .

[0041] Combined with the heat transfer principle of the steel industry furnace design manual, the above formula is determined, and the corresponding equipment correction coefficient C0 and radiation coefficient C are determined through the actual production data on site.L , complete the formula determination of heating furnace temperature and strip temperature.

[0042] According to the laws of thermodynamics, we have the following formula:

[0043] Q f +Q d =C*M*(t g -t b ) (3)

[0044] In the above formula, Q represents energy in kcal / h; C represents specific heat in kcal / kg * K.

[0045] Based on the above relationship model, the iterative model construction logic is as follows: solve the plate temperature when the furnace temperature is known. According to the determined relationship model, the entire control process is divided into 1000 time steps per second. Each step is calculated through different heat transfer coefficients (convective heat transfer and radiation heat transfer) and energy value formulas (1) and (2) to calculate the inlet temperature and outlet temperature (3). Finally, the corresponding plate temperature is calculated according to the set furnace temperature. Solve the furnace temperature when the plate temperature is known. If the furnace temperature is to be calculated by the plate temperature, the plate temperature is calculated by giving an initial furnace temperature (given by empirical value), and then the furnace temperature is corrected according to the calculated plate temperature and the target plate temperature until the plate temperature obtained under a certain furnace temperature is consistent with the target plate temperature, and the iteration ends.

[0046] Please refer to Figure 3 As shown, in one embodiment of the present application, determining the plate temperature parameter according to the strip temperature control range includes:

[0047] S301 obtains an upper limit temperature value, a target temperature value, and a lower limit temperature value of the secondary coil according to the strip temperature control range;

[0048] S302 obtains an adjustment strategy according to the comparison results of the plate temperature parameter and the upper limit temperature value, and the target temperature value and the lower limit temperature value;

[0049] S303 obtains a determination result according to the adjustment strategy.

[0050] Among them, the adjustment strategy includes: when the plate temperature parameter exceeds the upper limit temperature value, is equal to the upper limit temperature value, or is between the upper limit temperature value and the target temperature value, reducing the heat provided by the heating furnace per unit time; when the plate temperature parameter is equal to the target temperature value, outputting the target temperature value; when the plate temperature parameter exceeds the lower limit temperature value, is equal to the lower limit temperature value, or is between the lower limit temperature value and the target temperature value, increasing the heat provided by the heating furnace per unit time.

[0051] Specifically, the control strategy has been determined in the above embodiment, and the first trial calculation adjustment can be performed based on the control strategy. According to the control strategy, the primary volume and the secondary volume (if the control strategy is before the protection, the primary volume is the previous volume, and the secondary volume is the next volume, and the control strategy is the opposite after the protection).

[0052] Take the pre-protection strategy as an example: the furnace temperature is calculated based on the target temperature of the previous roll (primary roll), and this furnace temperature condition is applied to the next roll (secondary roll) to calculate the board temperature. There are 7 situations for judging this board temperature:

[0053] 1. Exceeds the upper limit (the minimum value calculated for the second time), 2. Equals the upper limit (the minimum value calculated for the second time), 3. Between the upper limit and the target temperature (the minimum value calculated for the second time), 4. Equals the target temperature (outputs the target temperature), 5. Between the target temperature and the lower limit (the maximum value calculated for the second time), 6. Equals the lower limit (the maximum value calculated for the second time), 7. Exceeds the lower limit (the maximum value calculated for the second time).

[0054] Among them, the second calculation minimum value is defined as the trial calculation direction (downward) (the heat provided by the heating furnace per unit time decreases); the second calculation maximum value is defined as the trial calculation direction (upward) (the heat provided by the heating furnace per unit time increases).

[0055] Please refer to Figure 4 As shown, in one embodiment of the present application, the plate temperature target of the front coil steel strip, the plate temperature target of the rear coil steel strip and the plate temperature target in the transition process are obtained by analyzing the plate temperature parameters calculated again, including:

[0056] S401 obtains furnace temperature parameters by reducing the amount of heat provided by the heating furnace per unit time or increasing the amount of heat provided by the heating furnace per unit time, and obtains plate temperature parameters corresponding to the secondary coil according to the furnace temperature parameters and the iterative model;

[0057] S402 obtains a board temperature adjustment strategy according to the relationship between the board temperature parameter and the target temperature value of the secondary coil;

[0058] S403 obtains the plate temperature target of the front coil steel, the plate temperature target of the rear coil steel during the front and rear strip control process, and the plate temperature target during the transition process according to the plate temperature adjustment strategy.

[0059] In actual work, after the trial calculation of the above embodiment, the second trial calculation can be started based on different situations. The specific process is as follows:

[0060] Take the pre-insurance strategy as an example:

[0061] Situations 1.2.3 in the first trial calculation require a second trial calculation, with the calculation direction downward:

[0062] Since the calculation direction is downward, it can be considered that the heat provided per unit time in the heating furnace is reduced, that is, the strip temperature in the furnace will decrease. Therefore, when the first calculation situation is 1, the second calculation situation may be 1 to 7. Similarly, when the first situation is N, the results of the second calculation are N to 7.

[0063] Example:

[0064] Take the target lower limit temperature of the previous roll to calculate the corresponding furnace temperature, apply the furnace temperature to the second roll, and judge the plate temperature.

[0065] Case 1 may have cases 1 to 7: Case 1 outputs the minimum value, Case 2 outputs the minimum value, Case 3 outputs the minimum value, Case 4 outputs the minimum value, Case 5 outputs the ratio, Case 6 outputs the ratio, and Case 7 outputs the ratio.

[0066] For other situations, please refer to the following Table 1, where the horizontal axis is the first trial calculation and the vertical axis is the second trial calculation:

[0067] Table 1

[0068] 1 2 3 4 5 6 7 1 Minimum X X X X X X 2 Minimum Minimum X X X X X 3 Minimum Minimum Minimum X X X X 4 Minimum Minimum Minimum Minimum X X X 5 Proportion Proportion Proportion Proportion Proportion X X 6 Proportion Proportion Proportion Proportion Proportion Proportion X 7 Proportion Proportion Proportion Proportion Proportion Proportion Proportion

[0069] Among them, the calculation formula of the ratio is: the minimum value of the main roll + (the target temperature of the secondary roll - the second trial temperature of the secondary roll); when the output is the minimum value, the minimum value of the main protection position is output; before protection, it is the previous roll, and after protection, it is the next roll.

[0070] Situations 5.6.7 in the first trial calculation require a second trial calculation, with the trial calculation direction upward; the second calculation maximum value is defined as the trial calculation direction upward (the heat provided by the heating furnace increases per unit time).

[0071] Case 7 may have cases 1 to 7: Case 7 outputs maximum value, Case 6 outputs maximum value, Case 5 outputs maximum value, Case 4 outputs maximum value, Case 3 ratio, Case 2 ratio, Case 1 ratio.

[0072] For other situations, please refer to the following Table 2, where the horizontal axis is the first trial calculation and the vertical axis is the second trial calculation:

[0073] Table 2

[0074] 1 2 3 4 5 6 7 1 Proportion Proportion Proportion Proportion Proportion Proportion Proportion 2 X Proportion Proportion Proportion Proportion Proportion Proportion 3 X X Proportion Proportion Proportion Proportion Proportion 4 X X X Maximum Maximum Maximum Maximum 5 X X X X Maximum Maximum Maximum 6 X X X X X Maximum Maximum 7 X X X X X X Maximum

[0075] Among them, the calculation formula of the ratio is: the maximum value of the target temperature of the main roll - (the second trial temperature of the secondary roll - the target temperature of the secondary roll); when the output is the maximum value, the maximum value of the main protection position (main roll) is output; before protection, it is the previous roll, and after protection, it is the next roll.

[0076] Therefore, based on the above at least two trial calculations, the corresponding plate temperature target of the front coil, the plate temperature target of the rear coil and the plate temperature target during the transition process can be determined, so as to generate corresponding control parameters based on these plate temperature targets, and use the control parameters to complete the plate temperature transition of the strip steel continuous retreat. The parameters of the plate temperature target during the transition process are to allow the front coil to move in advance before the next coil enters the heating furnace, and to move to the plate temperature target of the transition state. In this case, the furnace temperature will allow the next coil to reach the plate temperature target of the next coil after entering the furnace.

[0077] Please refer to Figure 5 As shown, the present application also provides a strip temperature transition control device for continuous strip retreat, the device comprising: a mode setting unit, used to determine the control strategy and the strip temperature control range according to the control requirements of the front and rear strips, and determine the main coils and secondary coils in the continuous strip retreat according to the control strategy; an analysis unit, used to construct a relationship model and an iteration model between the furnace temperature and the plate temperature by using a mechanism model and empirical parameters, and obtain the plate temperature target of the front roll strip, the plate temperature target of the rear roll strip and the plate temperature target in the transition process during the control process of the front and rear strips through at least two model trials according to the relationship model, the iteration model and the strip temperature control range; a parameter issuing unit, used to issue corresponding control parameters according to the plate temperature target to control the plate temperature transition of the continuous strip retreat.

[0078] In the above embodiment, the control strategy includes a pre-protection control mode and a post-protection control mode; the mode setting unit determines the main roll and the secondary roll in the strip steel continuous retreat according to the control strategy, including: when the control strategy is the pre-protection control mode, the main roll is the previous roll of strip steel, and the secondary roll is the next roll of strip steel; when the control strategy is the post-protection control mode, the main roll is the next roll of strip steel, and the secondary roll is the previous roll of strip steel. The analysis unit includes a trial calculation module, the trial calculation module is used to calculate the furnace temperature parameters according to the relationship model and the target temperature of the main roll, and calculate the plate temperature parameters of the secondary roll according to the furnace temperature parameters and the iterative model; the plate temperature parameters are determined according to the strip steel temperature control range, the target temperature of the main roll is adjusted according to the determination result, and the plate temperature parameters of the secondary roll are calculated again; the plate temperature target of the front roll of the strip steel, the plate temperature target of the rear roll of the strip steel, and the plate temperature target in the transition process are obtained by analyzing the recalculated plate temperature parameters.

[0079] In another embodiment of the present application, the trial calculation module determines the plate temperature parameter according to the strip temperature control range, including: obtaining the upper limit temperature value, target temperature value and lower limit temperature value of the secondary coil according to the strip temperature control range; obtaining an adjustment strategy according to the comparison results of the plate temperature parameter with the upper limit temperature value, the target temperature value and the lower limit temperature value respectively; and obtaining a determination result according to the adjustment strategy. Further, the trial calculation module obtains the plate temperature target of the front roll strip steel, the plate temperature target of the rear roll strip steel and the plate temperature target during the transition process of the front and rear strip steel control process through the recalculated plate temperature parameter analysis, including: obtaining the furnace temperature parameter by reducing the heat provided by the heating furnace per unit time or increasing the heat provided by the heating furnace per unit time, and obtaining the plate temperature parameter corresponding to the secondary coil according to the furnace temperature parameter and the iterative model calculation; obtaining the plate temperature adjustment strategy according to the relationship between the plate temperature parameter and the target temperature value of the secondary coil; obtaining the plate temperature target of the front roll strip steel, the plate temperature target of the rear roll strip steel and the plate temperature target during the transition process of the front and rear strip steel control process according to the plate temperature adjustment strategy.

[0080] Since the principle of solving the problem by the device is similar to that of the temperature transition control method for continuously withdrawing a strip, the implementation of the device can refer to the implementation of the temperature transition control method for continuously withdrawing a strip, and the repeated parts will not be repeated.

[0081] It can be seen from the above technical solution that the present application calculates the corresponding furnace temperature control parameters of the plate temperature during the specification change transition process in advance, and issues the furnace temperature control parameters in advance, thereby improving the yield of the strip during the specification change transition process. Compared with the traditional plate temperature closed-loop control, the present application can eliminate the inaccurate control caused by inaccurate measurement of the plate temperature meter, and the control speed is improved to a certain extent.

[0082] Figure 6 A schematic diagram of the physical structure of an electronic device provided in an embodiment of the present invention, such as Figure 6 As shown, the electronic device includes: a processor (processor) 501, a memory (memory) 502 and a bus 503.

[0083] The processor 501 and the memory 502 communicate with each other via a bus 503 .

[0084] The processor 501 is used to call the program instructions in the memory 502 to execute the methods provided by the above method embodiments.

[0085] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned strip continuous retreat temperature transition control method is implemented.

[0086] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the above-mentioned strip continuous retreat temperature transition control method is implemented.

[0087] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0088] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0089] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0090] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0091] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for controlling the temperature transition of a strip steel continuous stripping process, characterized in that: The method comprises: Determine the control strategy and the temperature control range of the strip according to the control requirements of the front and rear strips, and determine the main coil and the secondary coil in the strip continuous annealing according to the control strategy; A relationship model and an iteration model between furnace temperature and plate temperature are constructed by using a mechanism model and empirical parameters, and a plate temperature target of the front strip, a plate temperature target of the rear strip and a plate temperature target during the transition process are obtained by at least two model trials according to the relationship model, the iteration model and the strip temperature control range; Corresponding control parameters are issued according to the plate temperature target to control the plate temperature transition of the strip continuous retardation.

2. The method for controlling the temperature transition of a strip steel continuous stripping process according to claim 1, characterized in that: The control strategy includes a pre-protection control mode and a post-protection control mode; the determination of the main coil and the secondary coil in the strip continuous withdrawal according to the control strategy includes: When the control strategy is the front-protection control mode, the primary roll is the previous roll of strip steel, and the secondary roll is the next roll of strip steel; When the control strategy is the rear-protection control mode, the primary coil is the rear coil of steel strip, and the secondary coil is the front coil of steel strip.

3. The method for controlling the temperature transition of a strip steel continuous stripping process according to claim 1, characterized in that: According to the relationship model, the iteration model and the strip temperature control range, the plate temperature target of the front strip, the plate temperature target of the rear strip and the plate temperature target in the transition process are obtained by at least two model trials in the front and rear strip control process, including: Obtaining furnace temperature parameters according to the relationship model and the target temperature of the primary coil, and obtaining plate temperature parameters of the secondary coil according to the furnace temperature parameters and the iterative model; Determine the plate temperature parameter according to the strip temperature control range, adjust the target temperature of the primary coil according to the determination result, and recalculate the plate temperature parameter of the secondary coil; By recalculating the plate temperature parameters, the plate temperature targets of the front and rear strips, the rear strip temperature and the transition process are obtained.

4. The method for controlling the temperature transition of a strip steel continuous evacuation according to claim 3 is characterized in that: Determining the plate temperature parameter according to the strip temperature control range includes: Obtaining an upper limit temperature value, a target temperature value, and a lower limit temperature value of the secondary coil according to the strip temperature control range; Obtaining an adjustment strategy according to the comparison results of the plate temperature parameter and the upper limit temperature value, and the target temperature value and the lower limit temperature value; A determination result is obtained according to the adjustment strategy.

5. The method for controlling the temperature transition of a strip steel continuous evacuation according to claim 4, characterized in that: The adjustment strategy includes: When the plate temperature parameter exceeds the upper limit temperature value, is equal to the upper limit temperature value, or is between the upper limit temperature value and the target temperature value, reducing the amount of heat provided by the heating furnace per unit time; When the plate temperature parameter is equal to the target temperature value, outputting the target temperature value; When the plate temperature parameter exceeds the lower limit temperature value, is equal to the lower limit temperature value, or is between the lower limit temperature value and the target temperature value, the amount of heat provided by the heating furnace per unit time is increased.

6. The method for controlling the temperature transition of a strip steel continuous evacuation according to claim 5, characterized in that: The plate temperature target of the front coil steel, the plate temperature target of the rear coil steel and the plate temperature target of the transition process are obtained by recalculating the plate temperature parameter analysis, including: The furnace temperature parameters are obtained by reducing the amount of heat provided by the heating furnace per unit time or increasing the amount of heat provided by the heating furnace per unit time, and the plate temperature parameters corresponding to the secondary coil are obtained by calculation according to the furnace temperature parameters and the iterative model; Obtaining a plate temperature adjustment strategy according to a relationship between the plate temperature parameter and the target temperature value of the secondary coil; According to the plate temperature adjustment strategy, the plate temperature target of the front coil steel, the plate temperature target of the rear coil steel and the plate temperature target during the transition process are obtained during the front and rear strip control process.

7. A strip steel continuous evacuation temperature transition control device, characterized in that: The device comprises: A mode setting unit, used to determine a control strategy and a temperature control range of the strip according to control requirements of the front and rear strips, and to determine the main coil and the secondary coil in the strip continuous retardation according to the control strategy; An analysis unit is used to construct a relationship model and an iteration model between the furnace temperature and the plate temperature by using a mechanism model and empirical parameters, and obtain a plate temperature target of the front roll strip steel, a plate temperature target of the rear roll strip steel and a plate temperature target in the transition process in the front and rear strip steel control process through at least two model trials according to the relationship model, the iteration model and the strip steel temperature control range; The parameter sending unit is used to send corresponding control parameters according to the plate temperature target to control the plate temperature transition of the strip continuous retreat.

8. The strip continuous evacuation temperature transition control device according to claim 7 is characterized in that: The control strategy includes a pre-protection control mode and a post-protection control mode; the mode setting unit determines the main roll and the secondary roll in the continuous retreat of the strip according to the control strategy, including: when the control strategy is the pre-protection control mode, the main roll is the previous roll of strip steel, and the secondary roll is the next roll of strip steel; when the control strategy is the post-protection control mode, the main roll is the next roll of strip steel, and the secondary roll is the previous roll of strip steel.

9. The strip continuous evacuation temperature transition control device according to claim 7, characterized in that: The analysis unit includes a trial calculation module, which is used to calculate the furnace temperature parameters according to the relationship model and the target temperature of the main coil, and calculate the plate temperature parameters of the secondary coil according to the furnace temperature parameters and the iterative model; the plate temperature parameters are judged according to the strip temperature control range, and the target temperature of the main coil is adjusted according to the judgment result and the plate temperature parameters of the secondary coil are calculated again; the plate temperature target of the front coil strip during the front and rear strip control process, the plate temperature target of the rear coil strip and the plate temperature target during the transition process are obtained by analyzing the recalculated plate temperature parameters.

10. The strip continuous evacuation temperature transition control device according to claim 9, characterized in that: The trial calculation module determines the plate temperature parameter according to the strip temperature control range, including: obtaining the upper limit temperature value, the target temperature value and the lower limit temperature value of the secondary coil according to the strip temperature control range; obtaining an adjustment strategy according to the comparison results of the plate temperature parameter with the upper limit temperature value, the target temperature value and the lower limit temperature value respectively; A determination result is obtained according to the adjustment strategy.

11. The strip continuous annealing temperature transition control device according to claim 10, characterized in that: The trial calculation module obtains the plate temperature target of the front coil steel, the plate temperature target of the rear coil steel and the plate temperature target of the transition process by recalculating the plate temperature parameter analysis, including: The furnace temperature parameters are obtained by reducing the amount of heat provided by the heating furnace per unit time or increasing the amount of heat provided by the heating furnace per unit time, and the plate temperature parameters corresponding to the secondary coil are obtained by calculation according to the furnace temperature parameters and the iterative model; Obtaining a plate temperature adjustment strategy according to a relationship between the plate temperature parameter and the target temperature value of the secondary coil; According to the plate temperature adjustment strategy, the plate temperature target of the front coil steel, the plate temperature target of the rear coil steel and the plate temperature target during the transition process are obtained during the front and rear strip control process.

12. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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