Method for controlling an alternating current arc furnace smelting plant and related device

Abstract

The application provides a control method and related device of an alternating current arc furnace smelting device, and the method comprises the following steps: monitoring the state of a smelted object in the alternating current arc furnace; if the state of the smelted object in the alternating current arc furnace changes to a molten state, controlling the selection switch module to switch from the on state of the first end and the third end to the on state of the first end and the second end. The application can avoid damage to the conversion module caused by sudden change of the resistance value of the smelted object, ensure safe operation of the alternating current arc furnace smelting device, smelt metal by using low-frequency alternating current to supply power to the electrode, and reduce energy consumption.

Description

Technical Field

[0001] This application relates to the field of smelting equipment control technology, and in particular to a control method and related apparatus for AC electric arc furnace smelting equipment. Background Technology

[0002] As is well known, electric arc furnaces can be used to smelt metals such as scrap steel. As the name suggests, an AC electric arc furnace refers to an electric arc furnace powered by AC electricity. Electrical energy from the AC grid is converted into a circuit via a converter and three-phase electrodes, generating an arc current inside the furnace for smelting metals.

[0003] However, during the process of metal smelting changing from a solid state to a molten state, the resistance value will change abruptly, causing damage to the converter device. Summary of the Invention

[0004] This application provides a control method and related device for AC electric arc furnace smelting equipment to solve the problem of converter device damage caused by sudden changes in the resistance of smelted material in the prior art.

[0005] In a first aspect, this application provides a control method for an AC electric arc furnace smelting equipment, the AC electric arc furnace smelting equipment including a selection switch module, a converter module, an AC electric arc furnace, and electrodes; a first terminal of the selection switch module is connected to an AC power grid; a second terminal of the selection switch module is connected to the input terminal of the converter module; a third terminal of the selection switch module is connected to the electrodes; and an output terminal of the converter module is connected to the electrodes; the converter module is used to convert power frequency AC power into low frequency AC power.

[0006] The method includes:

[0007] Monitor the state of the material being smelted in the AC electric arc furnace;

[0008] If the state of the material being smelted in the AC electric arc furnace changes to a molten state, the selector switch module is controlled to switch from the state where the first terminal and the third terminal are connected to the state where the first terminal and the second terminal are connected.

[0009] Secondly, this application provides a control device for an AC electric arc furnace smelting equipment, the AC electric arc furnace smelting equipment including a selection switch module, a converter module, an AC electric arc furnace, and electrodes; the first terminal of the selection switch module is connected to the AC power grid; the second terminal of the selection switch module is connected to the input terminal of the converter module; the third terminal of the selection switch module is connected to the electrodes; and the output terminal of the converter module is connected to the electrodes; the converter module is used to convert the power frequency AC power into low frequency AC power.

[0010] The device includes:

[0011] The status monitoring module is used to monitor the status of the material being smelted in the AC electric arc furnace;

[0012] The switch switching module is used to control the selection switch module to switch from the connection state of the first terminal and the third terminal to the connection state of the first terminal and the second terminal if the state of the smelted material in the AC electric arc furnace becomes molten.

[0013] Thirdly, this application provides a terminal including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the control method for the AC electric arc furnace smelting equipment as described in any possible implementation of the first aspect above.

[0014] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the control method for the AC electric arc furnace smelting equipment as described in any possible implementation of the first aspect above.

[0015] Fifthly, embodiments of this application provide an AC electric arc furnace smelting apparatus, which includes the terminal described above.

[0016] This application provides a control method and related device for an AC electric arc furnace smelting equipment. By monitoring the state of the material being smelted in the AC electric arc furnace, when the material is in a solid state, the AC power grid can be directly used to power the electrodes. When the material becomes molten, the selection switch module is controlled to switch from the connection state of the first terminal and the third terminal to the connection state of the first terminal and the second terminal. This avoids damage to the converter module caused by sudden changes in the resistance of the material being smelted, ensuring the safe operation of the AC electric arc furnace smelting equipment. At the same time, using low-frequency AC power to power the electrodes to continue smelting metal can reduce energy consumption. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art 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.

[0018] Figure 1 This is a schematic diagram of the structure of the AC electric arc furnace smelting equipment provided in the embodiments of this application;

[0019] Figure 2This is a flowchart illustrating the implementation of the control method for the AC electric arc furnace smelting equipment provided in the embodiments of this application;

[0020] Figure 3 This is a schematic diagram of the structure of the control device for the AC electric arc furnace smelting equipment provided in the embodiments of this application;

[0021] Figure 4 This is a schematic diagram of the terminal provided in the embodiments of this application. Detailed Implementation

[0022] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following description will be provided in conjunction with the accompanying drawings and specific embodiments.

[0024] Figure 1 This is a schematic diagram of the structure of an AC electric arc furnace smelting equipment provided in an embodiment of this application. Figure 1 As shown, the AC electric arc furnace smelting equipment includes a selection switch module K2, a converter module 10, an AC electric arc furnace, and electrodes; the first terminal of the selection switch module K2 is connected to the AC power grid; the second terminal of the selection switch module K2 is connected to the input terminal of the converter module 10; the third terminal of the selection switch module K2 is connected to the electrodes; and the output terminal of the converter module 10 is connected to the electrodes; the converter module 10 is used to convert the power frequency AC power into low frequency AC power.

[0025] Specifically, the converter module 10 includes a rectifier module DC / AC and an inverter module AC / DC. The AC terminal of the rectifier module DC / AC is connected to the input terminal of the converter module 10, the DC terminal of the rectifier module DC / AC is connected to the DC terminal of the inverter module AC / DC, and the AC terminal of the inverter module AC / DC is connected to the output terminal of the converter module 10.

[0026] In this embodiment, the AC electric arc furnace smelting equipment also includes a cabinet, a control terminal 20, a human-machine interface module 30, and a heat dissipation module. The cabinet provides a protective enclosure for the internal components, shielding them and isolating them from personnel. The human-machine interface module 30 allows users to easily and quickly set equipment operating parameters for different materials being smelted, ensuring the equipment operates at its optimal smelting state and reducing smelting time and energy consumption. The heat dissipation module monitors the temperature of the equipment inside the cabinet and activates when the temperature exceeds a preset temperature to dissipate heat and maintain optimal operating conditions.

[0027] In this embodiment, the execution entity is a control terminal, which is used to control the power supply of the electrodes.

[0028] See Figure 2 The document illustrates a flowchart of the control method for the AC electric arc furnace smelting equipment provided in this embodiment, which is described in detail below:

[0029] S101: Monitor the state of the material being smelted in the AC electric arc furnace.

[0030] S102: If the state of the material being smelted in the AC electric arc furnace changes to a molten state, then the selection switch module K2 is controlled to switch from the connection state of the first end and the third end to the connection state of the first end and the second end.

[0031] In this embodiment, if the temperature does not reach a certain value, the material to be smelted is in a solid state. When the material to be smelted is heated to a certain temperature, it changes from a solid state to a molten state. This process causes a sudden change in the resistance of the electrode. To avoid damage to the converter device due to the sudden change in resistance, the control terminal controls the selection switch module K2 to switch from the off state to the on state of the first and third terminals when the material to be smelted is in a solid state. This allows the AC power grid to directly supply the power frequency AC power to the electrode, thereby enabling the material to be smelted to quickly enter the molten state. After the material to be smelted enters the molten state, the control terminal controls the selection switch module K2 to switch from the on state of the first and third terminals to the on state of the first and second terminals. The converter converts the power frequency AC power into low frequency AC power. After the electrode receives the low frequency AC power, it continues to smelt the molten material, which can reduce the power consumption of the equipment.

[0032] In one possible implementation, the specific implementation process of S101 includes:

[0033] The state of the material being smelted in the AC electric arc furnace is determined based on the resistance value of the material being smelted in the AC electric arc furnace.

[0034] In one possible implementation, the specific implementation process of S101 further includes:

[0035] S201: Real-time calculation of the resistance change rate of the smelted material;

[0036] S202: If the resistance change rate of the smelted material is detected to exceed a first preset threshold, and after the resistance change rate of the smelted material exceeds the first preset threshold, the resistance change rate of the smelted material is detected to remain below a second preset threshold for a first preset time, then it is determined that the state of the smelted material has changed to a molten state.

[0037] In this embodiment, the resistance of the smelted material is very high when it is in a solid state. When the smelted material changes from a solid state to a molten state, the resistance drops sharply until the smelted material enters a molten state, at which point the resistance will stabilize. Therefore, this embodiment can determine whether the smelted material has become molten based on the above-mentioned change law of the resistance change rate of the smelted material.

[0038] In one possible implementation, the rate of change of resistance of the material being smelted is monitored. If the rate of change of resistance exceeds a first preset threshold, timing begins at the moment the rate of change of resistance exceeds the first preset threshold. When the timing reaches a preset cumulative duration, the control terminal determines that the state of the material being smelted has changed to a molten state. The preset cumulative duration can be determined based on previous experiments.

[0039] In one possible implementation, the specific implementation process of S201 includes:

[0040] The voltage and current values ​​of the electrode terminals are obtained according to a preset sampling period;

[0041] Divide the voltage value of the same sampling period by the current value to obtain the resistance value of the smelted material;

[0042] The rate of change of resistance is calculated based on the resistance of the smelted material over multiple sampling periods.

[0043] Specifically, such as Figure 1 As shown, a voltage and current sensor (CT) is installed on the wire in front of the electrode. The voltage and current values ​​of the electrode are collected by the voltage and current sensor (CT) to calculate the resistance change rate of the smelted material.

[0044] In one possible implementation, such as Figure 1 As shown, the AC electric arc furnace smelting equipment includes a main switch K1; the main switch is connected in series between the AC power grid and the first terminal of the selection switch module K2; before S101, the method provided in this embodiment further includes:

[0045] When the main switch is detected to be closed, the selector switch module K2 is controlled to switch from the open state to the closed state of the first and third terminals.

[0046] In one possible implementation, the AC electric arc furnace smelting equipment further includes a mechanical drive module connected to the electrode; before controlling the selection switch module K2 to switch from an open state to an on state of the first and third terminals when the main switch is detected to be closed, the method provided in this embodiment further includes:

[0047] The electrode is controlled to descend to a preset depth inside the AC electric arc furnace by a mechanical drive module, and the main switch is closed when the electrode descends to the preset depth.

[0048] In this embodiment, the electrodes of the AC electric arc furnace are three-phase electrodes. The mechanical drive module can control the lifting speed of the three-phase electrodes based on the three-phase voltage of the three-phase electrodes to achieve synchronous lifting of the three-phase electrodes, so that the three-phase electrodes can be synchronously lowered to the preset depth of the AC electric arc furnace.

[0049] As can be seen from the above embodiments, the embodiments of this application can monitor the state of the smelted material in the AC electric arc furnace; when the smelted material is in a solid state in the AC electric arc furnace, the AC power grid can be directly used to power the electrodes; when the smelted material becomes molten, the selection switch module K2 can be controlled to switch from the connection state of the first terminal and the third terminal to the connection state of the first terminal and the second terminal, thereby avoiding damage to the converter module 10 caused by sudden changes in the resistance of the smelted material, ensuring the safe operation of the AC electric arc furnace smelting equipment, and at the same time, using low-frequency AC power to power the electrodes to smelt metal can reduce energy consumption.

[0050] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0051] The following are device embodiments of this application. For details not described in detail, please refer to the corresponding method embodiments described above.

[0052] Figure 3 A schematic diagram of the control device for an AC electric arc furnace smelting equipment provided in an embodiment of this application is shown. For ease of explanation, only the parts relevant to the embodiment of this application are shown, and are described in detail below:

[0053] like Figure 3 As shown, the control device 100 of the AC electric arc furnace smelting equipment includes:

[0054] The status monitoring module 110 is used to monitor the status of the material being smelted in the AC electric arc furnace;

[0055] The switch switching module 120 is used to control the selection switch module K2 to switch from the connection state of the first end and the third end to the connection state of the first end and the second end if the state of the smelted material in the AC electric arc furnace becomes molten.

[0056] In one possible implementation, the status monitoring module 110 includes:

[0057] The state of the material being smelted in the AC electric arc furnace is determined based on the resistance value of the material being smelted in the AC electric arc furnace.

[0058] In one possible implementation, the status monitoring module 110 further includes:

[0059] A resistance change rate calculation unit is used to calculate the resistance change rate of the smelted material in real time.

[0060] The state monitoring unit is configured to determine that the state of the smelted material has changed to a molten state if the resistance change rate of the smelted material exceeds a first preset threshold, and after the resistance change rate of the smelted material exceeds the first preset threshold, the resistance change rate of the smelted material continues for a first preset time less than a second preset threshold.

[0061] In one possible implementation, the resistance change rate calculation unit includes:

[0062] The voltage and current values ​​of the electrode terminals are obtained according to a preset sampling period;

[0063] Divide the voltage value of the same sampling period by the current value to obtain the resistance value of the smelted material;

[0064] The rate of change of resistance is calculated based on the resistance of the smelted material over multiple sampling periods.

[0065] In one possible implementation, the AC electric arc furnace smelting equipment includes a main switch; the main switch is connected in series between the AC power grid and the first terminal of the selector switch module K2; the control device 100 of the AC electric arc furnace smelting equipment further includes:

[0066] The selector switch switching module is used to control the selector switch module K2 to switch from the open state to the on state of the first and third terminals when the main switch is detected to be closed.

[0067] In one possible implementation, the AC electric arc furnace smelting equipment further includes a mechanical drive module connected to the electrode; the control device 100 of the AC electric arc furnace smelting equipment also includes:

[0068] The electrode lifting control module is used to control the electrode to descend to a preset depth inside the AC electric arc furnace via a mechanical drive module, and to control the main switch to close when the electrode descends to the preset depth.

[0069] As can be seen from the above embodiments, the embodiments of this application can monitor the state of the smelted material in the AC electric arc furnace; when the smelted material is in a solid state in the AC electric arc furnace, the AC power grid can be directly used to power the electrodes; when the smelted material becomes molten, the selection switch module K2 can be controlled to switch from the connection state of the first terminal and the third terminal to the connection state of the first terminal and the second terminal, thereby avoiding damage to the converter module 10 caused by sudden changes in the resistance of the smelted material, ensuring the safe operation of the AC electric arc furnace smelting equipment, and at the same time, using low-frequency AC power to power the electrodes to smelt metal can reduce energy consumption.

[0070] This application also provides a computer program product having program code. This program code, when run in a corresponding processor, controller, computing device, or terminal, executes the steps in any of the control method embodiments of the AC electric arc furnace smelting equipment described above. For example... Figure 2 Steps S101 to S102 are shown. Those skilled in the art will understand that the methods and apparatus proposed in the embodiments of this application can be implemented in various forms, including hardware, software, firmware, dedicated processors, or combinations thereof. Dedicated processors may include application-specific integrated circuits (ASICs), reduced instruction set computers (RISCs), and / or field-programmable gate arrays (FPGAs). The proposed methods and apparatus are preferably implemented as a combination of hardware and software. The software is preferably installed as an application program on a program storage device. This is typically based on a machine with a computer platform, such as one or more central processing units (CPUs), random access memory (RAM), and one or more input / output (I / O) interfaces. An operating system is also typically installed on the computer platform. The various processes and functions described herein may be part of an application program, or a portion thereof may be executed by an operating system.

[0071] Figure 4 This is a schematic diagram of the terminal provided in an embodiment of this application. For example... Figure 4 As shown, the terminal 4 in this embodiment includes: a processor 40, a memory 41, and a computer program 42 stored in the memory 41 and executable on the processor 40. When the processor 40 executes the computer program 42, it implements the steps in the control method embodiments of the various AC electric arc furnace smelting equipment described above, for example... Figure 2 Steps S101 to S102 are shown. Alternatively, when the processor 40 executes the computer program 42, it implements the functions of each module / unit in the above-described device embodiments.

[0072] For example, the computer program 42 may be divided into one or more modules / units, which are stored in the memory 41 and executed by the processor 40 to complete / implement the solution provided in this application. The one or more modules / units may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 42 in the terminal 4.

[0073] The terminal 4 can be a computing device such as a desktop computer, laptop, handheld computer, or cloud server. The terminal 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art will understand that... Figure 4 This is merely an example of terminal 4 and does not constitute a limitation on terminal 4. It may include more or fewer components than shown, or combine certain components, or different components. For example, the terminal may also include input / output devices, network access devices, buses, etc.

[0074] The processor 40 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0075] The memory 41 can be an internal storage unit of the terminal 4, such as a hard disk or memory of the terminal 4. The memory 41 can also be an external storage device of the terminal 4, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the terminal 4. Furthermore, the memory 41 can include both internal storage units and external storage devices of the terminal 4. The memory 41 is used to store the computer program and other programs and data required by the terminal. The memory 41 can also be used to temporarily store data that has been output or will be output.

[0076] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0077] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0078] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0079] In the embodiments provided in this application, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0080] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0081] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0082] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above-described embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the control method embodiments for each of the above-described AC electric arc furnace smelting equipment. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately added to or subtracted from the content as required by the legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium may not include electrical carrier signals and telecommunication signals.

[0083] Furthermore, the features of the embodiments shown in the accompanying drawings or the various embodiments mentioned in this specification should not be construed as independent embodiments. Rather, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments not described in words or with reference to the accompanying drawings.

[0084] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A control method for AC electric arc furnace smelting equipment, characterized in that, The AC electric arc furnace smelting equipment includes a selection switch module, a converter module, an AC electric arc furnace, and electrodes; the first terminal of the selection switch module is connected to the AC power grid; the second terminal of the selection switch module is connected to the input terminal of the converter module; the third terminal of the selection switch module is connected to the electrodes; and the output terminal of the converter module is connected to the electrodes. The converter module is used to convert the power frequency AC power into low frequency AC power. The method includes: Monitor the state of the material being smelted in the AC electric arc furnace; If the state of the material being smelted in the AC electric arc furnace changes to a molten state, the selector switch module is controlled to switch from the state where the first terminal and the third terminal are connected to the state where the first terminal and the second terminal are connected.

2. The control method for AC electric arc furnace smelting equipment according to claim 1, characterized in that, The monitoring of the state of the material being smelted in the AC electric arc furnace includes: The state of the material being smelted in the AC electric arc furnace is determined based on the resistance value of the material being smelted in the AC electric arc furnace.

3. The control method for AC electric arc furnace smelting equipment according to claim 2, characterized in that, Determining the state of the material being smelted in the AC electric arc furnace based on its resistance value includes: Real-time calculation of the resistance change rate of the smelted material; If the resistance change rate of the smelted material is detected to exceed a first preset threshold, and after the resistance change rate of the smelted material exceeds the first preset threshold, the resistance change rate of the smelted material is detected to remain below a second preset threshold for a first preset time, then it is determined that the state of the smelted material has changed to a molten state.

4. The control method for AC electric arc furnace smelting equipment according to claim 3, characterized in that, The real-time calculation of the resistance change rate of the smelted material includes: The voltage and current values ​​of the electrode terminals are obtained according to a preset sampling period; Divide the voltage value of the same sampling period by the current value to obtain the resistance value of the smelted material; The rate of change of resistance is calculated based on the resistance of the smelted material over multiple sampling periods.

5. The control method for AC electric arc furnace smelting equipment according to claim 1, characterized in that, The AC electric arc furnace smelting equipment includes a main switch; the main switch is connected in series between the AC power grid and the first terminal of the selector switch module; before monitoring the state of the material being smelted in the AC electric arc furnace, the method further includes: When the main switch is detected to be closed, the selector switch module is controlled to switch from the open state to the closed state of the first terminal and the third terminal.

6. The control method for AC electric arc furnace smelting equipment according to claim 5, characterized in that, The AC electric arc furnace smelting equipment further includes a mechanical drive module, which is connected to the electrode; before controlling the selector switch module to switch from an open state to an on state of the first terminal and the third terminal when the main switch is detected to be closed, the method further includes: The electrode is controlled to descend to a preset depth inside the AC electric arc furnace by a mechanical drive module, and the main switch is closed when the electrode descends to the preset depth.

7. A control device for an AC electric arc furnace smelting equipment, characterized in that, The AC electric arc furnace smelting equipment includes a selection switch module, a converter module, an AC electric arc furnace, and electrodes; the first terminal of the selection switch module is connected to the AC power grid; the second terminal of the selection switch module is connected to the input terminal of the converter module; the third terminal of the selection switch module is connected to the electrodes; and the output terminal of the converter module is connected to the electrodes. The converter module is used to convert the power frequency AC power into low frequency AC power. The device includes: The status monitoring module is used to monitor the status of the material being smelted in the AC electric arc furnace; The switch switching module is used to control the selection switch module to switch from the connection state of the first terminal and the third terminal to the connection state of the first terminal and the second terminal if the state of the smelted material in the AC electric arc furnace becomes molten.

8. A terminal, 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, it implements the steps of the control method for the AC electric arc furnace smelting equipment as described in any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the control method for the AC electric arc furnace smelting equipment as described in any one of claims 1 to 6.

10. An AC electric arc furnace smelting equipment, characterized in that, Including the terminal as described in claim 8.

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