Slab continuous casting machine crystallizer liquid level fluctuation control method, device and medium

Abstract

This application discloses a method, device, and medium for controlling fluctuations in the liquid level of a slab continuous casting machine's crystallizer, relating to the field of process flow. The method involves real-time analysis of the liquid level signal acquired by the liquid level control system using Fourier transform. The frequency of periodic fluctuations in the crystallizer liquid level is compared, and the relationship between the corresponding amplitude and a preset amplitude is obtained through a spectrum diagram. This allows for timely adjustment of the liquid core space to suppress fluctuations. In the early stages of periodic fluctuations in the crystallizer liquid level, specific changes in fluctuation data are detected at the microscopic level, enabling advance prediction of specific spectral signs before fluctuations occur. Compared to existing systems that require complex control systems and associated control models for adjustments during periodic fluctuations, resulting in higher maintenance costs and greater accuracy variations, this method allows for corresponding compensation control processing in the early stages of fluctuations. This prevents late compensation from leading to excessively large amplitudes that are difficult to suppress, reducing maintenance costs and extending equipment lifespan.

Description

Technical Field

[0001] This application relates to the field of industrial process control, and particularly to a method, device and medium for controlling the fluctuation of the liquid level in the mold of a slab continuous casting machine. Background Art

[0002] In recent years, through continuous promotion of technical upgrades and accuracy improvements in the slab continuous casting machines of domestic steel mills, the operation efficiency and product quality have been greatly improved. However, with the increase in casting speed and product variety, the problem of periodic fluctuations in the liquid level of the mold has become more prominent, which must be solved in the process of further stabilizing the quality and improving the efficiency of steel mills.

[0003] In the actual continuous casting production process, the height of the molten steel level in the mold is stably controlled by existing automatic control mechatronics equipment, and the liquid level position collected during the process is analyzed in real time. More advanced continuous casting machines are capable of dynamically adjusting the reduction amount of the slab solidification front according to the liquid level fluctuation situation, and forming a waveform opposite to the periodic fluctuation through reverse adjustment of the liquid core space, so as to suppress the generation of liquid level fluctuations in the mold. However, its adjustment strategy requires a complex control system, a control model supporting the steel mill, and powerful data maintenance. However, the control accuracy varies greatly, resulting in high maintenance costs and reduced service life of the equipment.

[0004] In view of the above technologies, it is an urgent problem for those skilled in the art to seek a method for controlling the fluctuation of the liquid level in the mold of a slab continuous casting machine. Summary of the Invention

[0005] The purpose of this application is to provide a method, device and medium for controlling the fluctuation of the liquid level in the mold of a slab continuous casting machine, preventing the amplitude from being too large to be suppressed due to late compensation, reducing maintenance costs and extending the service life of the equipment.

[0006] To solve the technical problem, this application provides a method for controlling the fluctuation of the liquid level in the mold of a slab continuous casting machine, including:

[0007] Receiving the liquid level data sent by the liquid level sensor;

[0008] Performing Fourier transform on the liquid level data to generate a spectrogram;

[0009] Detecting whether there is a fluctuation in the spectrogram whose amplitude exceeds the preset amplitude within a preset frequency range according to the spectrogram;

[0010] If so, adjusting the space of the liquid core according to the amplitude and frequency of the fluctuation, and suppressing the fluctuation according to the adjusted space of the liquid core.

[0011] Preferably, before detecting whether there is a fluctuation with an amplitude exceeding a preset amplitude within a preset frequency range based on the spectrum diagram, the method further includes:

[0012] The fluctuation is determined based on the spectrum diagram to determine whether it is a periodic fluctuation.

[0013] If so, proceed to the step of detecting whether there is a fluctuation in the amplitude of the spectrum exceeding the preset amplitude within the preset frequency range based on the spectrum.

[0014] If not, return to the step of receiving the liquid level data sent by the liquid level sensor.

[0015] Preferably, the step of suppressing the fluctuation based on the adjusted space of the liquid core includes:

[0016] The length of the liquid core can be changed by adjusting the space of the liquid core;

[0017] The fluctuation is suppressed based on the changed length of the liquid core;

[0018] The space adjustment strategy of the liquid core includes at least the following methods:

[0019] Adjust the secondary cooling water;

[0020] Adjust the second air conditioner;

[0021] Adjust the production speed.

[0022] Preferably, before adjusting the space of the liquid core according to the amplitude and frequency of the fluctuation, and suppressing the fluctuation according to the adjusted space of the liquid core, the method further includes:

[0023] The control and warning device issues an alarm to prompt the user to adjust the space of the liquid core.

[0024] Preferably, the liquid level data is acquired in the following way:

[0025] The acquisition frequency is set, and the liquid level data of the continuous casting crystallizer is acquired using the general OPC protocol.

[0026] Preferably, before detecting whether there is a fluctuation in the spectrum graph with an amplitude exceeding a preset amplitude within a preset frequency range based on the spectrum graph, and after detecting whether the fluctuation is a periodic fluctuation based on the spectrum graph, the method further includes:

[0027] Determine whether the spectrum of the spectrum diagram is within the preset frequency range;

[0028] If so, proceed to the step of detecting whether there is a fluctuation in the amplitude of the spectrum exceeding the preset amplitude within the preset frequency range based on the spectrum.

[0029] If not, return to the step of receiving the liquid level data sent by the liquid level sensor.

[0030] Preferably, the preset frequency range and the preset amplitude are obtained in the following manner:

[0031] Collect liquid level data with and without periodic fluctuations during normal process flow;

[0032] The Fourier transform is performed on the liquid surface data without periodic fluctuations and the liquid surface data with periodic fluctuations to establish a spectrum diagram without fluctuations and a spectrum diagram with fluctuations, respectively.

[0033] By comparing the difference between the spectrum diagram without fluctuations and the spectrum diagram with fluctuations, the frequency and amplitude corresponding to the periodic fluctuations with the difference are obtained as the preset frequency range and the preset amplitude.

[0034] To address the technical problem, this application also provides a device for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine, comprising:

[0035] The receiving module is used to receive liquid level data sent by the liquid level sensor;

[0036] The transformation module is used to perform Fourier transform on the liquid level data to generate a spectrum.

[0037] The detection module is used to detect whether there are fluctuations in the spectrum graph whose amplitude exceeds a preset amplitude within a preset frequency range. If so, it proceeds to the compensation module.

[0038] The compensation module is used to adjust the space of the liquid core according to the amplitude and frequency of the fluctuation, and to suppress the fluctuation according to the adjusted space of the liquid core.

[0039] To address the technical problem, this application also provides a device for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine, comprising:

[0040] Memory, used to store computer programs;

[0041] A processor is used to execute the computer program to implement the steps of the method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine as described above.

[0042] To address the technical problem, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the above-described method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine.

[0043] This application provides a method for controlling fluctuations in the liquid level of a slab continuous casting machine's crystallizer, comprising: receiving liquid level data sent by a liquid level sensor; generating a spectrum diagram by performing a Fourier transform on the liquid level data; detecting, based on the spectrum diagram, whether there are fluctuations within a preset frequency range whose amplitude exceeds a preset amplitude; if so, adjusting the space of the liquid core according to the amplitude and frequency of the fluctuation, and suppressing the fluctuation based on the adjusted space of the liquid core. This method performs real-time Fourier transform analysis on the liquid level signal collected by the liquid level control system, compares the frequency of periodic fluctuations in the crystallizer liquid level, and obtains the relationship between the corresponding amplitude and the preset amplitude through the spectrum diagram, adjusting the liquid core space in a timely manner to suppress the fluctuations. In the early stages of periodic fluctuations in the crystallizer liquid level, specific changes in fluctuation data can be detected in microscopic fluctuations, allowing for advance knowledge of the specific spectral signs before the fluctuations occur. Compared to existing complex control systems and associated control models that require adjustments during periodic fluctuations, resulting in higher maintenance costs and greater accuracy variations, this application can perform corresponding compensation control processing in the early stages of fluctuations, thereby preventing late compensation from leading to excessively large amplitudes that are difficult to suppress, reducing maintenance costs, and extending the service life of the equipment.

[0044] The fluctuation control device and computer-readable storage medium for the slab continuous casting machine crystallizer liquid level provided in this application correspond to the above-mentioned fluctuation control method for the slab continuous casting machine crystallizer liquid level, and have the same beneficial effects. Attached Figure Description

[0045] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 A flowchart of a method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine, provided as an embodiment of this application;

[0047] Figure 2 A spectrum diagram without periodic fluctuations is provided for an embodiment of this application;

[0048] Figure 3 A spectrum diagram with periodic fluctuations is provided for an embodiment of this application;

[0049] Figure 4A flowchart for determining a preset frequency range and a preset amplitude is provided in this application embodiment;

[0050] Figure 5 A structural diagram of a slab continuous casting machine crystallizer liquid level fluctuation control device provided in this application embodiment;

[0051] Figure 6 A structural diagram of a slab continuous casting machine crystallizer fluctuation control device provided in another embodiment of this application;

[0052] Figure 7 A flowchart of another method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine, provided as an embodiment of this application. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0054] The core of this application is to provide a method, device, and medium for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine, so as to prevent the amplitude from being too large and difficult to suppress due to late compensation, thereby reducing maintenance costs and extending the service life of the equipment.

[0055] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] Figure 1 A flowchart illustrating a method for controlling fluctuations in the liquid level of a slab continuous casting machine crystallizer, as provided in this application embodiment, is shown below. Figure 1 As shown, the method includes:

[0057] S10: Receive liquid level data sent by the liquid level sensor;

[0058] The liquid level sensor in the slab continuous casting machine's crystallizer is a fixed eddy current sensor, which detects the height of the molten steel level in the crystallizer. The eddy current sensor generates an electromagnetic signal that produces eddy currents on the surface of the molten steel. These eddy currents induce a signal in the sensor coil, and the strength of the signal varies with the distance from the surface of the molten steel to the bottom of the sensor. The sensor's induced signal is transmitted to the secondary instrument via a cable, and the secondary instrument processes the signal to provide the liquid level height and other information.

[0059] In this embodiment, the specific form of the liquid level sensor is not limited. It is understood that distance sensors or flow sensors, etc., can be used for corresponding liquid level detection. In this embodiment, the method of transmitting liquid level data and the specific content are not limited.

[0060] S11: Perform Fourier transform on the liquid level data to generate a spectrum;

[0061] The Fourier transform can represent a function that satisfies certain conditions as a linear combination of trigonometric functions (sine and / or cosine functions) or their integrals. In different research fields, the Fourier transform has various variants, such as the continuous Fourier transform and the discrete Fourier transform. Initially, Fourier analysis was proposed as a tool for the analytical analysis of thermal processes. In this embodiment, the specific method of generating the spectrum and the corresponding Fourier transform calculation method are not specifically limited.

[0062] S12: Detect whether there are fluctuations in the spectrum graph within the preset frequency range where the amplitude of the spectrum graph exceeds the preset amplitude. If so, proceed to S13.

[0063] S13: Adjust the space of the liquid core according to the amplitude and frequency of the fluctuation, and suppress the fluctuation according to the adjusted space of the liquid core.

[0064] The liquid core length refers to the length from the molten steel surface in the crystallizer to the point where the liquid core completely disappears during the continuous casting process. Liquid core length is one of the most important parameters of a continuous casting machine. Given fixed cooling conditions and slab cross-section, the metallurgical length determines the production scale of the continuous casting machine. Similarly, the liquid core space is the liquid volume space from the molten steel surface in the continuous casting crystallizer to the end of the liquid core.

[0065] This application provides a method for controlling fluctuations in the liquid level of a slab continuous casting machine's crystallizer, comprising: receiving liquid level data sent by a liquid level sensor; generating a spectrum diagram by performing a Fourier transform on the liquid level data; detecting, based on the spectrum diagram, whether there are fluctuations within a preset frequency range whose amplitude exceeds a preset amplitude; if so, adjusting the space of the liquid core according to the amplitude and frequency of the fluctuation, and suppressing the fluctuation based on the adjusted space of the liquid core. This method analyzes the liquid level signal collected by the liquid level control system in real time using Fourier transform, compares the frequency of periodic fluctuations in the crystallizer liquid level, and obtains the relationship between the corresponding amplitude and the preset amplitude through the spectrum diagram, adjusting the liquid core space in a timely manner to suppress the fluctuations. In the early stages of periodic fluctuations in the crystallizer liquid level, specific changes in fluctuation data can be detected at the microscopic level, allowing for advance knowledge of the specific spectral signs before the fluctuations occur. Compared to existing complex control systems and associated control models that require adjustments during periodic fluctuations, resulting in higher maintenance costs and greater accuracy variations, this application can perform corresponding compensation control processing in the early stages of fluctuations, preventing late compensation from leading to excessively large amplitudes that are difficult to suppress, reducing maintenance costs, and extending the service life of the equipment.

[0066] Considering that aperiodic fluctuations recover quickly after they occur, no fluctuation compensation is needed. Therefore, a preferred solution is provided, which includes, before detecting whether there are fluctuations with amplitudes exceeding a preset amplitude within a preset frequency range based on the spectrum, the following steps are also included:

[0067] Detect whether the fluctuations are periodic based on the spectrum diagram;

[0068] If so, proceed to the step of detecting whether there are fluctuations in the spectrum graph within the preset frequency range where the amplitude of the spectrum graph exceeds the preset amplitude based on the spectrum graph.

[0069] If not, return to the step of receiving the liquid level data sent by the liquid level sensor.

[0070] It should be noted that the method for observing whether a fluctuation is a periodic fluctuation is to directly compare the current spectrum obtained from the acquisition with the spectrum of periodic fluctuations obtained from historical detection. Fluctuations obtained at the same frequency are judged as periodic fluctuations, while fluctuations obtained at different frequencies are non-periodic fluctuations.

[0071] It is understandable that since the method of bulging the slab compensates for the fluctuations as soon as they occur, it is impossible to identify whether the fluctuations are periodic or non-periodic. In this embodiment, the periodic or non-periodic fluctuations are identified by the spectrum diagram, so that corresponding compensation is made for periodic fluctuations.

[0072] The detection provided in this embodiment is to determine whether the fluctuation is periodic, ensuring that subsequent actions are based on the frequency characteristics of the periodic fluctuations in the crystallizer, so as to facilitate the implementation of corresponding control measures in the initial stage of periodic fluctuations in the crystallizer page of the slab continuous casting machine.

[0073] In the above embodiments, as one implementation method, the liquid core space adjustment strategy suppresses fluctuations based on the adjusted liquid core space, including:

[0074] The length of the liquid core can be changed by adjusting the space of the liquid core.

[0075] The fluctuations are suppressed based on the changed length of the liquid core;

[0076] The adjustment strategies for the liquid core space include at least the following methods:

[0077] Adjust the secondary cooling water;

[0078] Adjust the second air conditioner;

[0079] Adjust the production speed.

[0080] The basic function of the secondary cooling water and secondary cooling air is to dynamically calculate the cooling water and cooling air volumes of each cooling zone based on the online process data of the continuous casting machine. During continuous casting production, the model dynamically calculates the water volume of each cooling zone based on changes in steel grade, casting speed, and molten steel temperature to achieve the target temperature required by the process and to achieve good slab surface and internal quality. The casting speed of the continuous casting machine refers to the speed at which the cast billet is pulled out of the crystallizer by the dummy bar. It is generally 1 m / min to 4 m / min. The casting speed determines the production efficiency of the continuous casting machine. However, high casting speed and high billet quality are often contradictory. Therefore, it is necessary to unify casting speed and quality according to the requirements of the product grade and quality.

[0081] In this embodiment, the adjustment strategy changes the length of the liquid core by adjusting the secondary cooling water, secondary cooling air, and production speed. It is understood that there can be one adjustment strategy or a combination of multiple adjustment strategies. There is no limitation here, and it can be set according to the actual situation.

[0082] This embodiment provides a method to adjust the space of the liquid core to change its length, and then suppress fluctuations based on the changed liquid core length. Compared to the conventional method of adjusting the size of the liquid core space by adjusting the roller spacing, this method has lower equipment requirements, lower control costs, and no impact on the accuracy of the roller gap in the sector segment.

[0083] When periodic fluctuations occur in the crystallizer liquid level, they always begin with an amplitude of <±3mm. At this point, operators cannot visually detect them, and relevant control measures cannot be applied promptly. By the time operators can observe the periodic fluctuations, the amplitude has already increased to ≥±3mm. At this point, implementing control measures is no longer effective in quickly eliminating the periodic fluctuations, and the recovery time is long. This leads to continuous periodic fluctuations in the crystallizer liquid level, increasing the risk of internal and external quality defects in the slab and severely impacting operational efficiency. Considering the precision issues of mechanical control, a preferred solution is provided here. Before adjusting the liquid core space according to the amplitude and frequency of the fluctuations, and before suppressing the fluctuations based on the adjusted liquid core space, the following steps are also included:

[0084] The control alarm device sounds an alarm to remind the user to adjust the fluid core space.

[0085] In this embodiment, the specific type of warning device is not limited. However, it should be noted that the warning device may include, but is not limited to, warning lights, buzzers, etc. An alarm is issued to prompt the user to make precise adjustments to the fluid core space.

[0086] The control and warning device provided in this embodiment issues an alarm, which solves the problem that the initial periodic fluctuations of the liquid level in the crystallizer of the slab continuous casting machine are not easily detected and cannot be effectively applied in advance, thus avoiding missing the best time for periodic fluctuations and causing larger periodic fluctuations.

[0087] Considering the completeness of the solution and the fact that the specific method for acquiring liquid level data is not limited in the above embodiments, a preferred solution is provided here, and the method for acquiring liquid level data is as follows:

[0088] Set the acquisition frequency and use the general OPC protocol to acquire liquid level data of the continuous casting crystallizer.

[0089] Object Linking and Embedding (OLE) for process control is an industry standard based on existing OLE, component object models, and distributed component object models technologies. OPC includes a complete set of standard interfaces, attributes, and methods for process control and manufacturing automation systems.

[0090] This embodiment provides a method for collecting liquid level data from a continuous casting crystallizer using the universal OPC protocol, reducing redundant development and minimizing incompatibility between data devices.

[0091] Based on the above embodiments, as one embodiment, before detecting whether there are fluctuations in the spectrum graph with amplitudes exceeding a preset amplitude within a preset frequency range, and after detecting that the fluctuations are periodic fluctuations based on the spectrum graph, the method further includes:

[0092] Determine whether the spectrum of the spectrogram is within the preset frequency range;

[0093] If so, proceed to the step of detecting whether there are fluctuations in the spectrum graph within the preset frequency range where the amplitude of the spectrum graph exceeds the preset amplitude based on the spectrum graph.

[0094] If not, return to the step of receiving the liquid level data sent by the liquid level sensor.

[0095] Understandably, after detecting periodic fluctuations, the system continues to determine whether the spectrum of the spectrogram is within a preset frequency range. If it is, the process proceeds to step S13; otherwise, it returns to step S11. This further determines the relationship between the frequency of the liquid level data under the current periodic fluctuations and the preset frequency range.

[0096] This embodiment provides a relationship between the frequency of determining the liquid level data under the current periodic fluctuation and the preset frequency range, so as to improve the accuracy of the early prediction of the control measures for the current slab continuous casting machine in the early stage of periodic fluctuation of the liquid level in the crystallizer.

[0097] The above embodiments do not limit the specific methods for obtaining the preset frequency range and preset amplitude. A preferred solution is provided here, whereby the preset frequency range and preset amplitude are obtained in the following manner:

[0098] Collect liquid level data with and without periodic fluctuations during normal process flow;

[0099] Fourier transforms were performed on liquid surface data with and without periodic fluctuations to construct spectrograms with and without fluctuations, respectively.

[0100] By comparing the differences between the spectrum diagrams without fluctuations and those with fluctuations, the frequencies and amplitudes corresponding to the different periodic fluctuations are obtained as preset frequency ranges and preset amplitudes.

[0101] It should be noted that, taking a twin-strand slab continuous casting machine in a steel plant as an example, with a production cross-section of 1030mm × 200mm, periodic fluctuations frequently occur during production. This invention is used to predict these periodic fluctuations in the liquid level. First, the frequency and amplitude of the periodic fluctuations in this casting machine are determined. During production, the OPC protocol, a common protocol in the automation industry, is used to collect crystallizer liquid level data at a frequency of 1Hz. Table 1 shows the liquid level data without periodic fluctuations, and Table 2 shows the liquid level data with periodic fluctuations. The collected liquid level data with and without periodic fluctuations during production are shown in Tables 1 and 2.

[0102] Table 1. Liquid Level Data Without Periodic Fluctuations

[0103]

[0104]

[0105] Table 2. Periodic Fluctuation Liquid Level Data

[0106]

[0107]

[0108] Figure 2 This application provides a spectrum diagram without periodic fluctuations. Figure 3 This application provides a spectrum diagram with periodic fluctuations as an embodiment of the present application. For example... Figure 2 and Figure 3 As shown, the frequency range of this periodic fluctuation is between 0.07 and 0.09 Hz, and the amplitude height is above 0.4 mm. Repeating the above process, and after long-term on-site monitoring of the liquid level and multiple comparisons, it was finally determined that the frequency range of the periodic fluctuation of this casting machine is between 0.05 and 0.09 Hz, and the amplitude height is above 0.35 mm.

[0109] Figure 4 A flowchart for determining a preset frequency range and a preset amplitude is provided in the embodiments of this application, such as... Figure 4 As shown:

[0110] S21: Collect production liquid level data;

[0111] S22: Determine whether it is a periodic fluctuation. If yes, proceed to step S23; otherwise, proceed to step S25.

[0112] S23: Fast Fourier Transform, and proceed to step S24;

[0113] S24: Periodic fluctuation spectrum diagram;

[0114] S25: Fast Fourier Transform, and proceed to step S26;

[0115] S26: Spectrum diagram of non-periodic fluctuations;

[0116] S27: Determine if they match. If yes, end; otherwise, proceed to step S28.

[0117] S28: Obtain the frequency f1-f2 and amplitude A of the periodic fluctuation.

[0118] The frequency and amplitude stages of periodic fluctuations provided in this application's embodiments facilitate the subsequent determination of the initial stage of periodic fluctuations and the corresponding predetermined control scheme.

[0119] In the above embodiments, a method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine has been described in detail. This application also provides embodiments corresponding to a device for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine. It should be noted that this application describes the embodiments of the device from two perspectives: one based on functional modules and the other based on hardware.

[0120] Figure 5 A structural diagram of a slab continuous casting machine crystallizer level fluctuation control device provided in this application embodiment is shown below. Figure 5 The device shown includes:

[0121] The receiving module 10 is used to receive liquid level data sent by the liquid level sensor;

[0122] Transformation module 11 is used to perform Fourier transform on the liquid level data to generate a spectrum.

[0123] The detection module 12 is used to detect whether there are fluctuations in the spectrum graph within a preset frequency range where the amplitude of the spectrum graph exceeds the preset amplitude. If so, it enters the compensation module.

[0124] The compensation module 13 is used to adjust the space of the liquid core according to the amplitude and frequency of the fluctuation, and to suppress the fluctuation according to the adjusted space of the liquid core.

[0125] Since the embodiments of the apparatus and the embodiments of the method correspond to each other, please refer to the description of the embodiments of the method for the embodiments of the apparatus and their corresponding beneficial effects, which will not be repeated here.

[0126] The device for controlling fluctuations in the liquid level of a slab continuous casting machine's crystallizer, provided in this application, includes a receiving module, a transformation module, a detection module, and a compensation module. Through the interaction of these modules, it can receive liquid level data sent by a liquid level sensor; perform a Fourier transform on the liquid level data to generate a spectrum; detect whether there are fluctuations within a preset frequency range whose amplitude exceeds a preset amplitude; if so, adjust the space of the liquid core according to the amplitude and frequency of the fluctuation, and suppress the fluctuation based on the adjusted space. This method analyzes the liquid level signal collected by the liquid level control system in real time using Fourier transform, compares the frequency of periodic fluctuations in the crystallizer liquid level, obtains the relationship between the corresponding amplitude and the preset amplitude through the spectrum, and adjusts the liquid core space in a timely manner to suppress fluctuations. In the early stages of periodic fluctuations in the liquid level of the crystallizer, specific changes in fluctuation data can be detected in the microscopic fluctuations. The specific signs of the spectrum before the fluctuations can be known in advance. Compared with the existing complex control systems and supporting control models caused by adjustments during periodic fluctuations, which result in high maintenance costs and large differences in accuracy, this application can perform corresponding compensation control processing when the fluctuations are still in their early stages. This prevents the amplitude from becoming too large and difficult to suppress due to late compensation, thereby reducing maintenance costs and extending the service life of the equipment.

[0127] Figure 6 A structural diagram of a slab continuous casting machine crystallizer level fluctuation control device provided in another embodiment of this application is shown below. Figure 6 As shown, the fluctuation control device for the liquid level in the slab continuous casting machine crystallizer includes:

[0128] Memory 20 is used to store computer programs;

[0129] The processor 21 is used to execute a computer program to implement the steps of the method for controlling the fluctuation of the liquid level in the slab continuous casting machine crystallizer as described in the above embodiments.

[0130] The slab continuous casting machine crystallizer fluctuation control device provided in this embodiment can include, but is not limited to, smartphones, tablets, laptops, or desktop computers.

[0131] The processor 21 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor 21 may be implemented using at least one hardware form selected from Digital Signal Processor (DSP), Field-Programmable Gate Array (FPGA), and Programmable Logic Array (PLA). The processor 21 may also include a main processor and a coprocessor. The main processor, also known as the Central Processing Unit (CPU), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 21 may integrate a Graphics Processing Unit (GPU), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, the processor 21 may also include an Artificial Intelligence (AI) processor, which handles computational operations related to machine learning.

[0132] The memory 20 may include one or more computer-readable storage media, which may be non-transitory. The memory 20 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In this embodiment, the memory 20 is used to store at least the following computer program 201, which, after being loaded and executed by the processor 21, is capable of implementing the relevant steps of the slab continuous casting machine crystallizer level fluctuation control method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 20 may also include an operating system 202 and data 203, etc., and the storage method may be temporary storage or permanent storage. The operating system 202 may include Windows, Unix, Linux, etc. The data 203 may include, but is not limited to, the data involved in the above-described slab continuous casting machine crystallizer level fluctuation control method.

[0133] In some embodiments, the slab continuous casting machine crystallizer liquid level fluctuation control device may further include a display screen 22, an input / output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.

[0134] Those skilled in the art will understand that Figure 6 The structure shown does not constitute a limitation on the fluctuation control device for the liquid level in the slab continuous casting machine crystallizer, and may include more or fewer components than shown.

[0135] The fluctuation control device provided in this application includes a memory and a processor. When the processor executes the program stored in the memory, it can implement the following method: the fluctuation control method of the liquid level in the slab continuous casting machine crystallizer involved in the above embodiments.

[0136] For a description of the fluctuation control device for the liquid level in the crystallizer of a slab continuous casting machine provided in this application, please refer to the above method embodiments. This application will not repeat the description here, but it has the same beneficial effects as the above-described fluctuation control method for the liquid level in the crystallizer of a slab continuous casting machine.

[0137] Finally, this application also provides an embodiment corresponding to a computer-readable storage medium. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps described in the above method embodiments.

[0138] It is understood that if the methods in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and executes all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0139] For a description of the computer-readable storage medium provided in this application, please refer to the above method embodiments. This application will not repeat the description here. It has the same beneficial effects as the above-described method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine.

[0140] Figure 7 A flowchart of another method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine, as provided in the embodiments of this application, is shown below. Figure 7 As shown, it includes:

[0141] S30: One-time judgment begins;

[0142] S31: Collect production liquid level data;

[0143] S32: Fast Fourier Transform;

[0144] S33: Real-time spectrum graph;

[0145] S34: Determine if there is a periodic fluctuation frequency f1-f2. If yes, proceed to step S35; otherwise, proceed to S38.

[0146] S35: Determine whether the maximum amplitude within the sub-frequency exceeds the amplitude A required for periodic oscillation. If so,

[0147] If not, proceed to step S36; otherwise, proceed to step S38.

[0148] S36: Alarm;

[0149] S37: Implement control measures;

[0150] S38: The decision process ends, and the process returns to step S30 after an interval of n seconds.

[0151] For a description of another method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine provided in this application, please refer to the above method embodiments. This application will not repeat the description here, but it has the same beneficial effects as the above-described method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine.

[0152] The above provides a detailed description of the method, apparatus, and readable storage medium for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0153] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine, characterized in that, include: Receive liquid level data sent by the liquid level sensor; wherein, the liquid level data acquisition process is in the early stage of fluctuation; The liquid level data is subjected to Fourier transform to generate a spectrum. Based on the spectrum, detect whether there are fluctuations in the spectrum within a preset frequency range where the amplitude exceeds a preset amplitude; If so, the space of the liquid core is adjusted according to the amplitude and frequency of the fluctuation, and the fluctuation is suppressed according to the adjusted space of the liquid core. Correspondingly, before detecting whether there are fluctuations with amplitudes exceeding a preset amplitude within a preset frequency range based on the spectrum diagram, the method further includes: The fluctuation is determined based on the spectrum diagram to determine whether it is a periodic fluctuation. If so, proceed to the step of detecting whether there is a fluctuation in the amplitude of the spectrum exceeding the preset amplitude within the preset frequency range based on the spectrum. If not, return to the step of receiving the liquid level data sent by the liquid level sensor; Correspondingly, the suppression of fluctuations based on the adjusted space of the liquid core includes: The length of the liquid core can be changed by adjusting the space of the liquid core; The fluctuation is suppressed based on the changed length of the liquid core; The space adjustment strategy of the liquid core includes at least the following methods: Adjust the secondary cooling water; Adjust the second air conditioner; Adjust the production speed.

2. The method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine according to claim 1, characterized in that, Before adjusting the space of the liquid core according to the amplitude and frequency of the fluctuation, and suppressing the fluctuation according to the adjusted space of the liquid core, the method further includes: The control and warning device issues an alarm to prompt the user to adjust the space of the liquid core.

3. The method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine according to claim 1, characterized in that, The liquid level data is collected in the following way: The acquisition frequency is set, and the liquid level data of the continuous casting crystallizer is acquired using the general OPC protocol.

4. The method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine according to claim 1, characterized in that, Before detecting whether there is a fluctuation in the spectrum graph with an amplitude exceeding a preset amplitude within a preset frequency range based on the spectrum graph, and after detecting that the fluctuation is a periodic fluctuation based on the spectrum graph, the method further includes: Determine whether the spectrum of the spectrum diagram is within the preset frequency range; If so, proceed to the step of detecting whether there is a fluctuation in the amplitude of the spectrum exceeding the preset amplitude within the preset frequency range based on the spectrum. If not, return to the step of receiving the liquid level data sent by the liquid level sensor.

5. The method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine according to claim 4, characterized in that, The preset frequency range and the preset amplitude are obtained in the following way: Collect liquid level data with and without periodic fluctuations during normal process flow; The Fourier transform is performed on the liquid surface data without periodic fluctuations and the liquid surface data with periodic fluctuations to establish a spectrum diagram without fluctuations and a spectrum diagram with fluctuations, respectively. By comparing the difference between the spectrum diagram without fluctuations and the spectrum diagram with fluctuations, the frequency and amplitude corresponding to the periodic fluctuations with the difference are obtained as the preset frequency range and the preset amplitude.

6. A device for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine, characterized in that, include: The receiving module is used to receive liquid level data sent by the liquid level sensor; wherein, the liquid level data acquisition process is in the early stage of fluctuation; The transformation module is used to perform Fourier transform on the liquid level data to generate a spectrum. The detection module is used to detect whether there are fluctuations in the spectrum graph whose amplitude exceeds a preset amplitude within a preset frequency range. If so, it proceeds to the compensation module. The compensation module is used to adjust the space of the liquid core according to the amplitude and frequency of the fluctuation, and to suppress the fluctuation according to the adjusted space of the liquid core. Correspondingly, before detecting whether there are fluctuations with amplitudes exceeding a preset amplitude within a preset frequency range based on the spectrum diagram, the method further includes: The fluctuation is determined based on the spectrum diagram to determine whether it is a periodic fluctuation. If so, proceed to the step of detecting whether there is a fluctuation in the amplitude of the spectrum exceeding the preset amplitude within the preset frequency range based on the spectrum. If not, return to the step of receiving the liquid level data sent by the liquid level sensor; Correspondingly, the suppression of fluctuations based on the adjusted space of the liquid core includes: The length of the liquid core can be changed by adjusting the space of the liquid core; The fluctuation is suppressed based on the changed length of the liquid core; The space adjustment strategy of the liquid core includes at least the following methods: Adjust the secondary cooling water; Adjust the second air conditioner; Adjust the production speed.

7. A device for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine, characterized in that, include: Memory, used to store computer programs; A processor, configured to execute the computer program to implement the steps of the method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the method for controlling the fluctuation of the liquid level in the crystallizer of a slab continuous casting machine as described in any one of claims 1 to 5.

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