Electromagnetic slag removal method and device for hot galvanizing zinc pot

Abstract

The invention discloses an electromagnetic slag removal method and device for a hot galvanizing zinc pot, and relates to the field of zinc pot equipment. The problems that in the prior art, manual slag removal is adopted, so that the labor intensity of workers is increased, and manual slag removal limits the speed increase of a unit and the improvement of the production efficiency are solved. The method comprises the following steps: designing a winding mode of an electromagnetic winding; an electromagnetic winding is arranged above the surface of the zinc liquid through a prototype fixing unit, variable current is conducted on the electromagnetic winding to generate a traveling wave magnetic field, and a traveling wave magnetic field model is established; a traveling wave magnetic field generator is used for controlling the traveling wave magnetic field model, simulation analysis is conducted on the traveling wave magnetic field model, the phase change of the traveling wave magnetic field model is determined, and induced electromotive force and induced current are generated in the zinc liquid according to the phase change of the traveling wave magnetic field model; and the induced current generates Ampere force under the action of the magnetic field, the zinc liquid generates directional movement under the action of the Ampere force, and the non-contact type slag driving process is completed. The method is also suitable for the technical field of multi-field coupling research.

Description

Technical Field

[0001] The invention relates to the technical field of zinc pot equipment. Background Art

[0002] In the prior art, when the strip steel passes through the zinc pot for hot-dip galvanizing, the zinc liquid and aluminum components in the zinc pot react with the iron elements brought into the strip steel under high temperature conditions to produce zinc slag. According to its density and composition, zinc slag can be divided into three types: floating slag, suspended slag and bottom slag. Among them, the floating slag with lower density floats on the surface of the zinc liquid, and its interaction with the flow of the zinc pot surface has a significant impact on the smooth progress of hot-dip galvanizing production.

[0003] The zinc liquid on the surface of the zinc pot is easy to oxidize. If the flow of zinc liquid is too large, it will inevitably increase the amount of slag generated on the zinc pot surface and the loss of zinc resources. Therefore, the flow of zinc liquid on the surface must be controlled in time to reduce the surface oxidation of zinc liquid. At present, manual slag removal not only increases the labor intensity and limits the development of zinc pot automation, but also limits the further increase of unit speed and restricts the further improvement of production efficiency.

[0004] The traveling wave magnetic field is used to remove non-metallic inclusions in metallurgical processes to purify the molten metal. It has the advantages of saving equipment, no electrical pollution, and continuous operation. The traveling wave magnetic field can induce an alternating current in the molten metal, and the Lorentz force generated by the magnetic field in the same direction as the moving direction of the traveling wave magnetic field drives the molten metal to move. Since the conductivity of the slag is different from that of the zinc liquid, and there is a viscous force between the slag and the zinc liquid, the slag can move under the drive of the directional movement of the zinc liquid. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the manual slag cleaning in the prior art not only increases the labor intensity and limits the development of zinc pot automation, but also limits the further improvement of the unit speed and restricts the further improvement of production efficiency. To solve the above technical problems, the present invention is implemented through the following technical solutions:

[0006] Solution 1: A method for electromagnetic slag removal in a hot-dip galvanizing pot, wherein the method is as follows:

[0007] S1. Design the winding method of electromagnetic winding;

[0008] S2. Based on S1, a winding method of the electromagnetic winding is designed, the electromagnetic winding is placed above the surface of the zinc liquid through a prototype fixing unit, and a variable current is passed through the electromagnetic winding to generate a traveling wave magnetic field, and a traveling wave magnetic field model is established;

[0009] S3. Using a traveling wave magnetic field generator to control the traveling wave magnetic field model, performing simulation analysis on the traveling wave magnetic field model, determining the phase change of the traveling wave magnetic field model, and generating an induced electromotive force and an induced current in the zinc liquid according to the phase change of the traveling wave magnetic field model; the induced current generates an Ampere force under the action of the magnetic field, and the zinc liquid moves in a directional manner under the action of the Ampere force, thereby completing the contactless slag removal process.

[0010] Furthermore, a preferred embodiment is provided, wherein the electromagnetic winding is in the shape of a flat plate.

[0011] Furthermore, a preferred embodiment is provided, in which the method for designing the winding method of the electromagnetic winding in S1 includes determining the relationship between the electromagnetic winding and the input current and voltage of the power supply and realizing the winding method of the electromagnetic slag driving head.

[0012] Further, a preferred embodiment is provided, wherein the method for determining the relationship between the electromagnetic winding and the power supply input current and voltage is:

[0013]

[0014] Where f is the frequency, w1 is the number of turns per phase of the winding, K dp1 is the winding coefficient, B δ1 is the magnetic flux density, τ is the pole pitch, l δ is the effective side length of the coil.

[0015] Furthermore, a preferred embodiment is provided, in which the winding method of the electromagnetic slag driving head is implemented by a concentrated winding structure.

[0016] Further, a preferred embodiment is provided, in which the method for generating a traveling wave magnetic field in S2 is:

[0017]

[0018] Among them, v a (t) is the voltage of phase a, v b (t) is the voltage of phase b, v c (t) is the c-phase voltage, is the voltage amplitude, x

[0019] is a complex number, e is the base of the natural logarithm, j is the imaginary unit, and w is the angular frequency.

[0020] Furthermore, a preferred implementation manner is provided, wherein after the simulation analysis of the traveling wave magnetic field model in S3, the method further includes a step of verifying the traveling wave magnetic field model.

[0021] Solution 2: An electromagnetic slag removal device for a hot-dip galvanizing zinc pot, the electromagnetic slag removal device for a hot-dip galvanizing zinc pot comprising an electromagnetic slag removal unit, a control unit, a heat insulation unit, a prototype fixing unit, a host computer, and a slag removal robot;

[0022] The electromagnetic slag driving unit is used to generate a magnetic field to generate an induced eddy current with the zinc liquid, so that the zinc liquid is subjected to an electromagnetic force;

[0023] The control unit is used to execute the steps of any method described in scheme 1;

[0024] The thermal insulation unit is used to thermally insulate the device;

[0025] The prototype fixing unit is used to fix the prototype;

[0026] The host computer is used to obtain the operating parameters of the electromagnetic slag driving device and display the monitoring screen in real time;

[0027] The slag removal robot is used to specifically perform slag removal operations.

[0028] Furthermore, a preferred embodiment is provided, wherein the prototype fixing unit uses a cantilever beam structure to fix the prototype.

[0029] Furthermore, a preferred embodiment is provided, wherein the cantilever beam structure is fixed to the ground by anchor bolts.

[0030] The present invention is beneficial in that:

[0031] The electromagnetic slag removal method for hot-dip galvanizing zinc pot described in the present invention can achieve optimized control of the entire process by combining electromagnetic slag removal technology with other metallurgical technologies, such as continuous casting, rolling, etc. In addition, the electromagnetic field parameters and device design are optimized to improve the efficiency and application scope of electromagnetic slag removal.

[0032] The slag removal method of the present invention realizes the flow control of zinc liquid under non-contact conditions. During the whole operation process, no external device enters the zinc liquid, and the zinc liquid will not be polluted. After implementation, the corresponding products will be developed under the premise of considering the particularity and complexity of the equipment layout in the zinc pot area to realize automatic slag removal in the zinc pot area.

[0033] The slag removal method described in the present invention can be combined with the existing slag removal robot system to achieve the long-term goal of intelligently removing zinc slag from the zinc pot, provide technical support for the complete intelligence of the zinc pot area, and can greatly improve the slag removal efficiency, improve product quality, and reduce the labor intensity of workers.

[0034] The present invention realizes real-time monitoring and dynamic regulation of molten metal flow and inclusion distribution by introducing advanced sensors and control systems, which will greatly improve the stability of the production process and product quality.

[0035] By studying the interaction between multiple fields such as electromagnetic field, temperature field, flow field, etc., the present invention can more comprehensively understand the physical phenomena in the electromagnetic slag driving process, and provide theoretical support for optimizing process parameters and improving product quality.

[0036] The electromagnetic slag driving device for hot-dip galvanizing zinc pot described in the present invention can achieve electromagnetic slag driving without functional loss on one side of the zinc pot for 72 consecutive hours.

[0037] The present invention is also applicable to the technical field of multi-field coupling research. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The present invention is a schematic diagram of the electromagnetic slag driving principle process used in the electromagnetic slag driving method for hot-dip galvanizing zinc pot described in the first embodiment.

[0039] Figure 2 This is a schematic diagram of the winding structure of the linear electromagnetic slag driving head described in the eleventh embodiment.

[0040] Figure 2 In the figure, (a) is a distributed winding and (b) is a concentrated winding.

[0041] Figure 3 Schematic diagram of the traveling wave magnetic field principle according to the eleventh embodiment.

[0042] Figure 4 This is a schematic diagram of the linear slag driving electromagnetic principle - the transformation of the rotating magnetic field into a traveling wave magnetic field as described in the eleventh embodiment.

[0043] Figure 5 This is a schematic diagram of the effect of the number of poles on the electromagnetic thrust for slag removal as described in the eleventh embodiment.

[0044] Figure 5 In the figure, (a) is a schematic diagram of a 3-pole thrust of 23N, and (b) is a schematic diagram of a 2-pole thrust of 40N.

[0045] Figure 6 This is a schematic diagram of the electromagnetic driving force principle of the slag removal equipment described in the eleventh embodiment.

[0046] Figure 7 Schematic diagram of the curve showing the change of electromagnetic thrust with excitation frequency in the eleventh embodiment.

[0047] Figure 8 It is a schematic diagram of a curve showing the change of thrust with air gap distance described in the eleventh embodiment.

[0048] Fig. 9 This is a schematic diagram of the electromagnetic head solution process described in the eleventh embodiment.

[0049] Fig.10This is a schematic diagram of the finite element model drawn in the eleventh embodiment.

[0050] Fig.11 Schematic diagram of the definition solver and materials described in Implementation Example 11.

[0051] Fig.12 This is a schematic diagram of defining incentives as described in implementation mode eleven.

[0052] Fig.13 This is a schematic diagram of the definition of segmentation and step size as described in Implementation Example 11.

[0053] Fig.14 The computer described in the eleventh embodiment will automatically complete the finite element solution calculation of the motor to obtain a schematic diagram summarizing the characteristic curve of the linear induction motor.

[0054] Fig.15 Schematic diagram of the relationship between the slag removal thrust, speed and frequency according to the eleventh embodiment.

[0055] Fig.16 Schematic diagram comparing the magnetic flux density distribution of the two electromagnetic heads described in the eleventh embodiment.

[0056] Fig.16 Among them, (c) is a schematic diagram of the magnetic flux distribution of two-phase four-coil, and (d) is a schematic diagram of the magnetic flux distribution of three-phase six-coil.

[0057] Fig.17 Schematic diagram comparing the thrusts of the two electromagnetic heads described in the tenth embodiment.

[0058] Fig.17 In the figure, (e) is a two-phase motor thrust diagram with a current of 75 Arms per phase; (b) is a three-phase motor thrust diagram with a current of 50 Arms per phase.

[0059] Fig.18 This is a curve diagram of thrust versus air gap distance when the current per phase is 50 Arms as described in the eleventh embodiment.

[0060] Fig.19 This is a curve diagram of the thrust changing with the excitation frequency when the current per phase is 50 Arms as described in the eleventh embodiment.

[0061] Fig. 20 This is a curve diagram of the thrust changing with the number of turns when the current per phase is 50 Arms as described in the eleventh embodiment.

[0062] Fig.21 This is a curve diagram of the terminal voltage changing with the number of turns when the current per phase is 50 Arms as described in the eleventh embodiment.

[0063] Fig. 22This is a schematic diagram of the saturation condition of different tooth widths calculated by the finite element simulation described in the eleventh embodiment.

[0064] Fig.23 This is a curve diagram of the thrust changing with the tooth width when the current per phase is 50 Arms as described in the eleventh embodiment.

[0065] Fig.24 This is a curve diagram of the thrust changing with the number of turns when the current per phase is 75 Arms as described in the eleventh embodiment.

[0066] Fig.25 This is a curve diagram of the change of terminal voltage with the number of turns when the current per phase is 75Arms as described in the eleventh embodiment.

[0067] Fig.26 This is a curve diagram of the thrust changing with the excitation frequency when the current per phase is 75 Arms as described in the eleventh embodiment.

[0068] Fig. 27 This is a curve diagram of the terminal voltage changing with the excitation frequency when the current per phase is 75 Arms as described in the eleventh embodiment.

[0069] In the figure, there are half-filled slots 1, primary core 2, primary winding 3, secondary conductive plate 4, air gap 5, secondary iron yoke 6, primary stator 7, secondary cage rotor 8, longitudinal current component 9, and transverse current component 10. DETAILED DESCRIPTION

[0070] In order to make the purpose, technical solutions and advantages of the implementation methods of the present application clearer, the technical solutions in the implementation methods of the present application will be clearly and completely described below in conjunction with the drawings in the implementation methods of the present application. Obviously, the described implementation methods are only part of the implementation methods of the present application, not all of the implementation methods.

[0071] Embodiment 1: This embodiment provides an electromagnetic slag driving method for hot-dip galvanizing zinc pot, and the electromagnetic slag driving method for hot-dip galvanizing zinc pot is:

[0072] S1. Design the winding method of electromagnetic winding;

[0073] S2. Based on S1, a winding method of the electromagnetic winding is designed, the electromagnetic winding is placed above the surface of the zinc liquid through a prototype fixing unit, and a variable current is passed through the electromagnetic winding to generate a traveling wave magnetic field, and a traveling wave magnetic field model is established;

[0074] S3. Using a traveling wave magnetic field generator to control the traveling wave magnetic field model, performing simulation analysis on the traveling wave magnetic field model, determining the phase change of the traveling wave magnetic field model, and generating an induced electromotive force and an induced current in the zinc liquid according to the phase change of the traveling wave magnetic field model; the induced current generates an Ampere force under the action of the magnetic field, and the zinc liquid moves in a directional manner under the action of the Ampere force, thereby completing the contactless slag removal process.

[0075] Embodiment 2: This embodiment further limits the electromagnetic slag driving method for hot-dip galvanizing zinc pot described in Embodiment 1, and the electromagnetic winding is in a flat plate shape.

[0076] Implementation method three: This implementation method is a further limitation of the electromagnetic slag removal method for hot-dip galvanizing zinc pot described in implementation method one. The method for designing the winding method of the electromagnetic winding in S1 includes determining the relationship between the electromagnetic winding and the power supply input current and voltage and the winding method of the electromagnetic slag removal head.

[0077] Embodiment 4: This embodiment further limits the electromagnetic slag removal method for hot-dip galvanizing zinc pot described in Embodiment 3. The method for determining the relationship between the electromagnetic winding and the input current and voltage of the power supply is:

[0078]

[0079] Where f is the frequency, w1 is the number of turns per phase of the winding, K dp1 is the winding coefficient, B δ1 is the magnetic flux density, τ is the pole pitch, l δ is the effective side length of the coil.

[0080] Embodiment 5: This embodiment further limits the electromagnetic slag driving method for hot-dip galvanizing zinc pot described in embodiment 3. The winding method of the electromagnetic slag driving head adopts a concentrated winding structure.

[0081] Embodiment 6: This embodiment further limits the electromagnetic slag removal method for hot-dip galvanizing zinc pot described in Embodiment 1. The method for generating a traveling wave magnetic field in S2 is:

[0082]

[0083] Among them, v a (t) is the voltage of phase a, v b (t) is the voltage of phase b, v c (t) is the c-phase voltage, is the voltage amplitude, x

[0084] is a complex number, e is the base of the natural logarithm, j is the imaginary unit, and w is the angular frequency.

[0085] Embodiment 7: This embodiment further limits the electromagnetic slag driving method for hot-dip galvanizing zinc pot described in Embodiment 1. After simulating and analyzing the traveling wave magnetic field model in S3, it also includes a step of verifying the traveling wave magnetic field model.

[0086] Embodiment 8: This embodiment proposes an electromagnetic slag removal device for a hot-dip galvanizing zinc pot, which includes an electromagnetic slag removal unit, a control unit, a heat insulation unit, a prototype fixing unit, a host computer, and a slag removal robot;

[0087] The electromagnetic slag driving unit is used to generate a magnetic field to generate an induced eddy current with the zinc liquid, so that the zinc liquid is subjected to an electromagnetic force;

[0088] The control unit is used to execute the steps of the method described in any one of implementation modes 1 to 5;

[0089] The thermal insulation unit is used to thermally insulate the device;

[0090] The prototype fixing unit is used to fix the prototype;

[0091] The host computer is used to obtain the operating parameters of the electromagnetic slag driving device and display the monitoring screen in real time;

[0092] The slag removal robot is used to specifically perform slag removal operations.

[0093] Embodiment 9: This embodiment further limits the electromagnetic slag driving device for hot-dip galvanizing zinc pot described in Embodiment 8, and the prototype fixing unit adopts a cantilever beam structure to fix the prototype.

[0094] Embodiment 10: This embodiment further limits the electromagnetic slag driving device for hot-dip galvanizing zinc pot described in Embodiment 9. The cantilever beam structure is fixed to the ground by anchor bolts.

[0095] Implementation Method 11: See Figures 1 to 27 This embodiment describes that this embodiment conducts basic research on key technologies such as electromagnetic winding design, traveling wave magnetic field generation, electromagnetic force drive, and continuous slag motion control in electromagnetic slag removal technology. In order to break through the key technologies of electromagnetic slag removal, this embodiment conducts research in three aspects: theoretical analysis, model establishment, simulation, and experimental verification.

[0096] In terms of electromagnetic windings, the electromagnetic windings are designed, and the effects of the number of turns, winding shape, size and other characteristics of the electromagnetic windings on the traveling wave magnetic field are studied. The matching relationship between the electromagnetic windings and the input current and voltage of the power supply is studied to ensure that the electromagnetic windings can meet the conditions for generating the traveling wave magnetic field.

[0097] In terms of traveling wave magnetic field, the generation principle of traveling wave magnetic field, the influence of series on the uniformity distribution of magnetic field in space above the traveling wave magnetic field generator, the influence of current intensity and frequency changes on the traveling wave magnetic field intensity are studied. On this basis, a traveling wave magnetic field model is established, and ANSYS is used to simulate the magnetic field distribution.

[0098] In terms of electromagnetic driving force, the principle of electromagnetic driving force generation is studied, the influence of magnetic field strength and frequency changes on driving force is studied, and the influence of the distance between the electromagnetic winding and the zinc liquid surface on driving force is studied; in terms of driving the continuous movement of slag, the arrangement of electromagnetic windings and the control method of the traveling wave magnetic field generator are studied. Finally, low-melting-point alloy metal liquid is used as the medium, combined with the above-mentioned electromagnetic winding to simulate electromagnetic slag driving, verify the correctness of the theory of this implementation method, and lay the foundation for subsequent research on electromagnetic slag driving.

[0099] The hardware system architecture described in this embodiment includes an electromagnetic slag driving unit, a control unit, a heat insulation unit, a prototype fixing unit, a host computer, and a power supply; the functions of each part are as follows:

[0100] (1) Power supply

[0101] The power supply includes a driving power supply main circuit and a control subsystem. The driving power supply main circuit includes a three-phase inverter. The control subsystem is connected to the inverter IGBT tube contained in the three-phase inverter. The control subsystem controls the conduction or shutdown of the inverter IGBT tube. By changing the power supply output current, frequency and time interval, the slag removal effect can be optimized and the product quality stability can be improved. The power supply control is a variable frequency current control. After sampling the three-phase AC current, it is fed back to the central processor to complete the digital PWM closed-loop control. The power supply control program runs on the power supply central processor, and the control screen cannot be observed.

[0102] (2) Electromagnetic winding

[0103] In order to achieve non-contact slag removal, a flat plate is used. The traveling wave magnetic field is a moving magnetic field that changes with time and is generated by a multi-turn coil with three-phase alternating current. The traveling wave magnetic field generator adopts star connection, and the current intensity I, frequency f and phase shift In order to generate a continuously changing traveling wave magnetic field, a sinusoidal current with the same amplitude and a phase difference of 120° must be passed through the three coils.

[0104] (3) Thermal insulation unit

[0105] The design of the heat insulation device adopts forced air cooling + heat insulation cotton. The air enters from both sides of the electromagnetic head. Five rows of ventilation holes are designed on the shell of the electromagnetic head close to the operating room as air outlets. The heat insulation cotton is placed on the inner side of the bottom plate of the electromagnetic head. Only one side of the electromagnetic head shell has ventilation holes, and the rest of the surface is completely sealed, so the prototype can be dustproof. The ambient temperature in the working area of ​​the prototype reaches hundreds of degrees Celsius, so there is no need to consider the waterproof problem of the prototype.

[0106] (4) Prototype fixing unit

[0107] The prototype fixing mechanism initially adopts a cantilever beam mechanism, which is fixed to the ground by anchor bolts. The electromagnetic head is installed at the front end of the cantilever beam. In order to determine whether the temperature inside the electromagnetic head under the fixing mechanism can meet the working requirements, a temperature test experiment was conducted on site at Handan Iron and Steel before formal installation and commissioning.

[0108] (5) Control unit

[0109] The field control unit is the local end, and its main functions are to control the start and stop of the power supply, adjust parameters, alarm for faults, and reset parameters after troubleshooting.

[0110] (6) Host computer

[0111] The host computer is used to interact with the power cabinet PLC, including command execution, information acquisition, and display interface. The host computer uses Advantech 610L industrial computer. Advantech 610L industrial computer is a 4U 19" rack-mounted industrial computer chassis for high-critical mission applications. It can accommodate a 14-slot PCI / ISA backplane or commercial motherboard. There is a locked door on the front panel of the chassis to prevent abnormal operation. The airflow in the chassis is controlled by a hot-swappable cooling fan. IPC-610L is shock-resistant and can work in harsh environments with dust.

[0112] (7) Safety devices and feedback equipment

[0113] Safety devices include safety guardrails, power self-protection, and feedback device screen (pop-up window) display. The safety guardrail is installed on the side of the electromagnetic head fixing mechanism close to the operating room. The AC to DC power supply module has a self-protection module that automatically cuts off the power supply when overloaded. When the device is in abnormal working state, the screen pops up an alarm.

[0114] The software system architecture described in this embodiment includes a host computer interface system, a communication system, and a slag drive prototype system, and its functions are as follows:

[0115] Start / stop automatic slag removal (remote operation mode), obtain the power supply operation status of the electromagnetic head, obtain the operation parameters, set the intermittent operation time, intermittent stop time, set the current value (remote operation mode), switch the operation mode, and display the monitoring screen in real time.

[0116] The communication system realizes data transmission between the host computer and the power cabinet PLC through the TCP / IP interface, including displaying the operation mode, power supply operation status, solenoid head temperature status, current status, communication status, fault indication, setting intermittent operation time, intermittent stop time, and current value.

[0117] The slag driving prototype system software runs in the power cabinet PLC, mainly controlling parameters such as current, voltage, frequency, etc., sending status to the host computer in remote mode, and accepting commands from the host computer.

[0118] The zinc liquid on the surface of the zinc pot is easy to oxidize, and the excessive flow of zinc liquid increases the amount of slag generated on the zinc pot surface and the loss of zinc resources. At present, manual slag removal is adopted, which not only increases the labor intensity and limits the development of zinc pot automation, but also limits the further improvement of the unit speed and restricts the further improvement of production efficiency.

[0119] The slag removal method described in this embodiment realizes the flow control of zinc liquid under non-contact conditions. During the entire operation process, no external device enters the zinc liquid, and the zinc liquid will not be contaminated. After implementation, the corresponding products will be developed under the premise of considering the particularity and complexity of the equipment layout in the zinc pot area to realize automatic slag removal in the zinc pot area.

[0120] The slag removal method described in this embodiment can be combined with the existing slag removal robot system to achieve the long-term goal of intelligently removing zinc slag from the zinc pot, provide technical support for the complete intelligence of the zinc pot area, and can greatly improve the slag removal efficiency, improve product quality, and reduce the labor intensity of workers.

[0121] The slag driving mode is an automatic intermittent slag driving working mode. First, the voltage, current and frequency values ​​required for stable slag driving are determined through debugging. Subsequently, according to the amount of zinc slag, the parameters such as the start-up and intermittent time (for example, 60 seconds for start-up and 5 minutes for standby) can be adjusted to ensure the slag driving effect.

[0122] The prototype described in this embodiment mainly realizes the one-side slag removal with the zinc pot as the main body. The slag removal position is initially selected as the side of the zinc pot close to the operating room. The process of realizing electromagnetic slag removal is as follows: first, it is necessary to design a winding electromagnetic winding, which is placed above the surface of the zinc liquid through a cantilever beam mechanism, and a variable current is passed through the electromagnetic winding to generate a traveling wave magnetic field. The traveling wave magnetic field generator is used to control the phase change of the traveling wave magnetic field so that an induced electromotive force and an induced current are generated in the zinc liquid. The induced current generates an Ampere force under the action of the magnetic field, and the zinc liquid moves in a directional manner under the action of the Ampere force. Since the conductivity of the slag is different from that of the zinc liquid, and there is a viscous force between the slag and the zinc liquid, the directional movement of the zinc liquid will drive the directional movement of the slag, completing the contactless slag removal process. Operation process: After the staff starts the power supply, they can monitor and observe the amount of zinc slag, and adjust the slag removal operation interval time parameter according to the amount of zinc slag. The electromagnetic slag removal operation is realized without slag removal functional loss on one side of the zinc pot for a total of 72 hours.

[0123] The specific simulation process is as follows:

[0124] The electromagnetic slag removal device can be equivalent to a linear induction motor in principle, and the following analysis and design are based on this. The established model includes the primary iron core, coil winding, air gap, secondary zinc liquid, etc. The driving force required for on-site manual slag removal is observed to be tens of Newtons. The current direction of the electromagnetic head is only along the normal direction of one side, and the magnetic field has only a direction within one side. Therefore, the two-dimensional magnetic field analysis method is used, and only a model on one plane needs to be established. On one side of the zinc pot, the length of the electromagnetic head is smaller than the zinc pot, and the slag removal is mainly concentrated in the area below the electromagnetic head. Therefore, there is no need to model the zinc pot, and only the physical properties of the zinc liquid need to be defined. And the lower half of the finite element model is drawn. The secondary zinc liquid is the moving part, and the moving area is 0-4000mm in the positive direction. The zinc liquid is set to a fixed conductivity.

[0125] (1) Design of electromagnetic winding, and study of the matching relationship between electromagnetic winding and power supply input current and voltage;

[0126] The formula for the induced electromotive force of each phase winding is:

[0127]

[0128] It can be seen from formula (1) that the back EMF is determined by the air gap area, magnetic flux density, frequency and the number of turns of each phase winding. The back EMF cannot exceed the input voltage. Combined with the voltage drop of the input current on the resistor and inductor, the number of turns of each phase winding can be estimated.

[0129] (2) Study on the influence of the number of turns, impedance, shape and size of the winding in the electromagnetic winding on the traveling wave magnetic field;

[0130] From (1), we can see that the number of turns is determined by the input voltage, the coil impedance affects the current amplitude, and the product of the current and the number of turns determines the amplitude of the traveling wave magnetic field.

[0131] The electromagnetic slag driving head can adopt two winding forms: distributed winding and concentrated winding. The magnetic field harmonics formed by the distributed winding are small, the end slot utilization rate is only half, and the size is relatively large. Although the concentrated winding has large harmonics, it can fully utilize the limited size, so the concentrated winding structure is adopted in this embodiment.

[0132] (3) Study on the generation principle of traveling wave magnetic field and establish the traveling wave magnetic field model;

[0133] The conditions for the generation of traveling wave magnetic field are three-phase currents that vary with time and three-phase windings that are distributed in space. Taking three-phase voltage as an example, the complex number x is introduced, and the final synthesized voltage is a rotating vector, which is a linear motion in the electromagnetic slag drive head.

[0134]

[0135] (4) Study on the influence of pole number on the uniformity distribution of magnetic field in the space above the traveling wave magnetic field generator;

[0136] The effect of magnetic field distortion caused by primary current asymmetry and core interruption is called the end effect of linear motor. With more poles, the end effect accounts for a smaller proportion, and the advantage is that the magnetic field harmonics are small and evenly distributed.

[0137] The number of poles is also an important design parameter in the thrust of electromagnetic slag driving equipment. In order to increase the basic traveling wave thrust, it is usually desirable to select a smaller number of poles. When the air gap magnetic flux remains unchanged, the reduction in the number of poles will increase the magnetic flux per pole. In order to prevent the yoke magnetic circuit from saturating, the yoke height needs to be increased, which will significantly increase the volume and mass of the primary core. In addition, as the number of poles decreases, the length of the primary winding end will also increase, increasing the end leakage resistance and loss, reducing the output thrust per unit input power, and reducing the motor efficiency. When the number of poles is large, the magnetic resistance between adjacent magnetic poles on one side of the primary may be smaller than the magnetic resistance of the main magnetic circuit, thereby increasing the fundamental wave leakage resistance of the air gap magnetic field, and if it is too small, the tooth leakage resistance will increase and the thrust will decrease.

[0138] (5) Study on the influence of current intensity and frequency changes on the traveling wave magnetic field intensity;

[0139] The current amplitude is proportional to the magnetic field strength, and the frequency affects the speed of the traveling magnetic field (Formula 5).

[0140] (6) Research on the principle of electromagnetic driving force generation;

[0141] The three-phase winding of the slag drive electromagnetic head is connected with a three-phase balanced AC to generate a traveling wave magnetic field moving to the right at a synchronous speed, and the primary (slag drive electromagnetic head) is stationary. The secondary (zinc liquid) is initially stationary. According to the law of electromagnetic induction, eddy currents will be induced in the secondary conductor. The magnetic field generated by the eddy current will resist the increase in the magnetic field caused by the primary. The eddy current effect of the secondary also induces a three-phase balanced current with a space difference of 120°. The secondary also generates a magnetic field moving to the right, which is a slip speed difference from the primary magnetic field. The secondary zinc liquid flows to the right, and this slip speed is the flow speed of the secondary zinc liquid.

[0142] (7) Study on the influence of magnetic field intensity and frequency changes on driving force;

[0143] F em =BIL (6)

[0144] The driving force and magnetic field strength are linearly related. The effect of frequency change on driving force is relatively complex. Frequency change first induces eddy current in zinc liquid, and the potential generated by eddy current generates current, which finally forms electromagnetic thrust through formula 6. Finite element software is usually used for simulation and solution.

[0145] (8) Study on the influence of the distance between the electromagnetic winding and the zinc liquid surface on the driving force;

[0146] The electromagnetic head in the slag drive device is far away from the zinc liquid and cannot be expressed with an accurate analytical expression. Therefore, finite element simulation is used to calculate the influence of the distance between the electromagnetic winding and the zinc liquid surface on the driving force. The slag drive device should minimize the air gap length from the zinc liquid. The smaller the air gap, the smaller the excitation current, the greater the traveling wave thrust, and the higher the power factor and efficiency. At the same time, the temperature effect is considered. A small air gap will cause the electromagnetic head to overheat and burn. Through product research and finite element simulation, it is determined to use 20cm.

[0147] (9) Research on the arrangement of electromagnetic windings required for continuous movement of molten metal;

[0148] The winding forms are divided into concentrated winding and a pair of poles.

[0149] (10) Research on the control method of the traveling wave magnetic field generator required for the continuous movement of molten metal;

[0150] The principle of the electromagnetic slag driving device is equivalent to an open-loop controlled linear induction motor. During the continuous flow of zinc liquid, the power supply device samples the electromagnetic head current, decomposes the fundamental current amplitude, controls the amplitude and frequency of the output voltage, and forms a closed-loop control system to keep the electromagnetic head input current at a constant frequency and amplitude. The zinc liquid receives a constant thrust to ensure that the zinc liquid moves at a constant flow rate.

[0151] (11) Use ANSYS simulation verification and conduct experimental verification;

[0152] The principle analysis and performance optimization of the electromagnetic head have been completed, and experimental verification has been completed in a small zinc pot in a steel plant.

[0153] The electromagnetic field simulation process is as follows:

[0154] Normally, the geometric model of the simulation object can be directly established by using the software environment itself. The model of the linear induction motor studied in this embodiment adopts full parameterized modeling, which not only facilitates parameter optimization but also greatly improves efficiency.

[0155] To simplify the analysis and calculation, the following assumptions are made: the primary core is laminated and pressed, the conductivity of the core can be ignored, and the eddy current effect in the primary core is not considered. Its magnetic resistance can generally be ignored, and the hysteresis effect of the primary core is ignored. The nonlinearity of ferromagnetic materials is considered by its magnetization curve. The physical constants of each layer of medium are homogeneous, isotropic, and linear. Each field quantity changes sinusoidally with time. The primary winding current only flows in the axial direction, and the secondary only moves in the axial direction.

[0156] (a) Create a model

[0157] According to the motor parameters introduced above, the motor model is established in MAXWELL. Since the current direction of the linear motor is only along the normal direction of one side, and the magnetic field has only a direction within one side, the two-dimensional magnetic field analysis method can be used, and only a model on one plane needs to be established. The primary iron core, coil winding, air gap, secondary zinc liquid, etc. of the linear motor are established.

[0158] (b) Create a physical environment

[0159] This embodiment uses a two-dimensional transient field, in which there is an eddy current area in the secondary induction zinc liquid. Defining material properties In the electromagnetic field model of the motor, there are generally multiple material areas, such as air, magnetic conductive materials, conductive areas and permanent magnetic areas. The corresponding material properties must be entered for each material area, and the material properties can be linear or nonlinear. In the definition of material properties in this embodiment, except for the primary core choke set to a nonlinear magnetization curve, the rest are set to relative magnetic permeability, and the zinc liquid is set to a fixed conductivity. The material database that comes with the software package has preset types of commonly used engineering materials, such as copper, steel, etc. For linear motors, material definitions can be directly called, for example, the stator winding material of the motor can be directly defined as copper. If the material library does not contain all the materials required for the motor, the user can define the material.

[0160] (c) Setting boundary conditions and excitation sources

[0161] Finite element analysis needs to solve a set of nonlinear time-varying differential equations, and boundary conditions must be provided. Boundary conditions in the software can be divided into value boundaries, natural boundaries, symmetric boundaries, open domains, or balloon boundaries. Due to the "click-and-select" method, the selection of boundaries and the setting of boundary conditions become very convenient. For the motor model of this embodiment, the model background can be defined as a balloon boundary condition.

[0162] Apply an excitation source to the primary winding coil of the motor, here add a three-phase AC current source, the primary coil phase A, B and C, corresponding to which are A-phase, B-phase and C-phase.

[0163] (d) Set execution parameters and solution options

[0164] The software can predefine engineering solution parameters such as inductance, capacitance, force, torque, core loss, etc. The motor needs to consider the loss during operation. The loss of the linear motor is set in the "Execution Parameter Settings", mainly the primary winding loss. The solution options include two parts of meshing and motor operation status settings. The reason why the finite element method has become the dominant numerical calculation method for quantitative analysis and optimization design of various electromagnetic field and electromagnetic wave engineering problems is that its excellent ability to adapt to the geometric shape of the field boundary and the physical variation of the medium is closely related. Discretizing the complex field in actual engineering into "finite elements", that is, the partitioning problem, is a very important link in the application of finite elements. Solving the dynamic partitioning problem is the key problem of dynamic electromagnetic field finite element calculation. There is no absolute rule or standard for partitioning a continuous field into a finite number of units. Since the shape, number, distribution density, etc. of the partitioning unit are closely related to the accuracy and calculation time of the numerical solution, when analyzing the problem, it is necessary to select the appropriate shape and distribution density of the partitioning unit according to the needs.

[0165] The software has a mesh adaptive function, which is a major advantage of the software. The adaptive technology can achieve a reasonable distribution of mesh units, thereby improving the calculation accuracy. Adaptive mesh subdivision is an iterative process. The program first generates an initial mesh with fewer units, then calculates the field quantity, subdivides the mesh of some areas according to the field quantity distribution, and then calculates the field, and repeats in sequence. Manual meshing can also be performed. Based on the electromagnetic field analysis of the motor, a triangular mesh subdivision diagram will be automatically generated. When the automatic subdivision of some solution areas cannot meet the requirements, manual subdivision can be performed. Here, the air gap and secondary of the linear induction motor are subdivided and encrypted, which is beneficial to the accuracy of the transient electromagnetic field analysis of the motor.

[0166] After the meshing is completed, enter the motor motion solution option. Due to the introduction of the air gap concept, the moving part and the stationary part of the motor can be clearly divided. In MAXWELL, it is stipulated that all objects in the inner enclosed area are moving objects, while the outer ones are stationary objects. Set the secondary of the linear induction motor as the moving part, that is, the zinc liquid, and the moving area is 0-4000mm in the positive direction.

[0167] The simulation solution stop time is set to the movement distance divided by the movement speed, and the step size is set to 1 / 50 of the current frequency.

[0168] (e) Simulation solution

[0169] After the above contents are set, the solution can be performed. The computer will automatically complete the finite element solution calculation of the motor and obtain certain characteristic curves of the linear induction motor, such as electromagnetic thrust, normal force, flux linkage, winding current, speed and core loss curves.

[0170] (f) Post-processing

[0171] After the solution process is completed, click to enter the result output, graphic display and analysis interface. MAXWELL has powerful post-processing functions, including drawing time-varying curves of global and local data. The field calculator module in the post-processor further expands the function of the post-processor. Using the field calculator, according to the equation, correct and meaningful vector algebra and integral operations can be performed on basic field quantities such as magnetic density B, magnetic vector A, etc.

[0172] (12) The prototype can realize electromagnetic slag removal on one side of the zinc pot, laying the foundation for the subsequent commercialization of electromagnetic slag removal. The simulation of electromagnetic slag removal is based on the evaluation of the on-site environmental parameters and the driving force level required to drive the zinc liquid. The driving force obtained by simulation can theoretically drive the zinc liquid. The prototype is manufactured under the guidance of simulation. Theoretical and offline experiments have proved that it can drive the metal plate. The actual slag removal effect still needs further experimental verification.

[0173] The main process schemes for electromagnetic field separation of inclusions are: orthogonal DC electric field and steady magnetic field, AC electric field, fixed alternating magnetic field and mobile magnetic field. In addition to these four methods, electromagnetic separation of inclusions can also be achieved by applying a strong DC magnetic field, applying alternating current and alternating magnetic field at the same time, or applying alternating current and DC magnetic field at the same time. Among all electromagnetic purification schemes, the external alternating magnetic field is the most convenient to implement. Compared with traditional processes, the use of electromagnetic force to remove inclusions has the advantages of high efficiency, stability and cleanliness. High efficiency means that electromagnetic separation can theoretically effectively separate micron-level fine inclusions; stability means that when the electromagnetic field is relatively stable, the removal rate of inclusions is also relatively stable; cleanliness mainly means that electromagnetic purification is a non-contact treatment process, which will not cause pollution to the environment and the melt itself.

[0174] The basic principle of the electromagnetic slag driving method for the zinc pot proposed in this embodiment is as follows: an electromagnetic slag driving device based on the principle of a linear motor is arranged above the hot-dip galvanizing zinc pot to generate an electromagnetic driving force for the zinc liquid in the hot-dip galvanizing zinc pot, thereby driving the surface zinc liquid in the zinc pot to flow in a controllable and orderly manner, and the zinc slag floating above the zinc liquid is dragged to follow the flow of the zinc liquid due to the viscosity, thereby achieving the purpose of non-contact electromagnetic slag driving, which greatly helps the development of smart manufacturing in the field of cold rolling and hot-dip galvanizing and increases the speed of production lines, thereby improving economic benefits.

[0175] Linear motors evolved from ordinary rotary motors. Although they are different from ordinary rotary AC motors in terms of structure type, their basic principles are the same. Linear motors can be considered as an evolution of rotary motors in terms of structure. It can be seen as first cutting a rotary motor in its radial direction, and then expanding the circumference of the motor into a straight line, thus obtaining the most primitive linear motor evolved from a rotary motor.

[0176] The most basic working principle of a linear induction motor is: when three-phase alternating current is connected to the primary three-phase winding, a linear moving magnetic field will be generated in the air gap of the motor. Under the action of this moving magnetic field, a current is induced in the secondary conductor sheet. The electromagnetic thrust generated by the interaction between this current and the moving magnetic field causes the secondary to move in a straight line along the direction of the linear moving magnetic field.

[0177] From the perspective of magnetic flux density distribution, the initial magnetic flux density of the three-phase is large, but it decays faster than that of the two-phase. At 40cm, the magnetic flux density of the two-phase electromagnetic head is slightly larger.

[0178] Keep the power constant and the distance from the electromagnetic head to the liquid surface at 30cm. The current of the two-phase motor is selected as 75A and the current of the three-phase motor is 50A. At this time, the thrust of the two-phase motor is 13.9N and the thrust of the three-phase motor is 23.5N. It can be seen that the thrust formed by the three-phase motor is 69% higher than that of the two-phase motor.

[0179] The thrust of the three-phase electromagnetic head is obviously greater than that of the two-phase head at the same power. The final plan is to adopt the three-phase electromagnetic head slag removal solution.

[0180] First, the parameters of the electromagnetic slag drive head are optimized

[0181] (1) Relationship between the electromagnetic head and the liquid surface

[0182] Simulation conditions: three-phase excitation, frequency of 1 Hz, current of 50 Arms.

[0183] The distance from the electromagnetic head to the zinc pot liquid surface was adjusted from 10cm to 70cm with a step length of 10cm. It can be seen that the thrust decays exponentially with the increase of distance. Finally, through on-site inspection, it was determined that the gap distance was 20cm, and the thrust was 52.3N at this time.

[0184] (2) Relationship between thrust and excitation frequency

[0185] Simulation conditions: three-phase excitation, current of 50 Arms, distance from electromagnetic head to zinc pot surface of 20 cm. Frequency changes from 1 to 10 Hz.

[0186] The thrust increases first and then decreases with the increase of frequency.

[0187] (3) Relationship between thrust and number of turns

[0188] Simulation conditions: three-phase excitation, current of 50 Arms, distance from electromagnetic head to zinc pot surface of 20 cm. Number of turns varied from 200 to 400.

[0189] The electromagnetic head in the slag drive device is far away from the zinc liquid, and the magnetic leakage is serious. It cannot be expressed with an accurate analytical expression. Finite element simulation is used to calculate the relationship between thrust and turns, terminal voltage and turns. It is necessary to ensure that the terminal voltage of the electromagnetic head is less than the bus voltage minus the resistance drop when the number of turns increases, and a certain safety margin must be left (5% according to experience). The relationship between thrust and turns is close to the square, and the relationship between terminal voltage and turns is also close to the square. A margin must be left when designing, and the number of turns must be less than 400N, and 380 turns are preferred.

[0190] (4) Relationship between thrust and tooth width

[0191] Simulation conditions: three-phase excitation, current of 50 Arms, distance from electromagnetic head to zinc pot liquid surface of 20 cm.

[0192] The tooth width changes from 50mm to 125mm. The relationship between thrust and tooth width is close to linear. The stator core material of the electromagnetic head in the slag drive device is silicon steel sheet B50A470. During design, the stator core teeth and yoke cannot exceed the saturation flux density in the magnetization curve. Increasing the tooth width can reduce magnetic saturation, while reducing the tooth width can embed more enameled wire to reduce the resistance loss of the electromagnetic head. It is also impossible to express it with an accurate analytical expression, so the saturation of different tooth widths is calculated by finite element simulation, and the 75mm tooth width close to saturation is selected as the final solution.

[0193] Secondly, electromagnetic slag drive head parameter calibration

[0194] (1) Turns calibration

[0195] Simulation conditions: three-phase excitation, current of 75Arms, distance from electromagnetic head to zinc pot surface of 20cm. Number of turns from 300 to 350. The relationship between thrust and number of turns is close to square, and the relationship between terminal voltage and number of turns is also close to square. The design needs to leave a margin, the number of turns should be less than 340N, and the preferred range is 320-330 turns.

[0196] (2) Excitation frequency calibration

[0197] Simulation conditions: three-phase excitation, current of 75 Arms, distance from electromagnetic head to zinc pot surface of 20 cm. Frequency changes from 0.5 to 20 Hz. Thrust increases first and then decreases with increasing frequency. Considering zinc liquid speed and thrust comprehensively, frequency 2 to 10 Hz is preferred, and the maximum frequency is set to 10 Hz.

[0198] (3) Zinc liquid flow speed and thrust

[0199] Simulation conditions: three-phase excitation, current of 75 Arms, distance from electromagnetic head to zinc pot surface of 20 cm. Thrust and zinc liquid flow velocity are close to the external characteristics of induction motor. The thrust is large when the excitation frequency is low. As the zinc liquid velocity increases, the excitation frequency needs to be adjusted synchronously to keep the thrust near the maximum value.

[0200] Through the above analysis and simulation, the parameters are as follows:

[0201] 1. Comparing the two-phase 4-coil and three-phase 6-coil topologies, it is found that the thrust of the three-phase electromagnetic head is significantly greater than that of the two-phase at the same power. The final plan is to adopt the three-phase electromagnetic head slag removal solution.

[0202] 2. As the distance increases, the thrust decays exponentially. Finally, through on-site inspection, it was determined that the gap distance was 20cm, and the thrust was 52.3N at this time.

[0203] 3. The thrust increases first and then decreases with the increase of frequency. Considering the zinc liquid speed and thrust comprehensively, the frequency of 2 to 10 Hz is preferred, and the maximum frequency is set to 10 Hz.

[0204] 4. The relationship between thrust and number of turns is close to the square, and the relationship between terminal voltage and number of turns is also close to the square. The design needs to leave a margin, the number of turns should be less than 340N, and the preferred range is 320-330 turns.

[0205] 5. The relationship between thrust and tooth width is close to linear. When designing, the saturation of the tooth should be taken into consideration, and the tooth width should be minimized as much as possible, with 75mm being the preferred choice.

[0206] 6. The thrust and zinc liquid flow speed are close to the external characteristics of the induction motor. The thrust is large when the excitation frequency is low. As the zinc liquid speed increases, the excitation frequency needs to be adjusted synchronously to keep the thrust near the maximum value.

[0207] 7. The slot distance of the slag driving prototype is 174mm, the tooth width is 58mm, the core length is 1044mm, and the total length of the electromagnetic head is 1474mm. The bottom insulation layer is 30mm, the effective height of the electromagnetic head is 265mm, and the effective width of the electromagnetic head is 250mm.

[0208] The fixed mechanism and air cooling test method are as follows: the fixed mechanism is initially adopted. The schematic diagram of the cantilever beam support mechanism is shown below. Two lifting rings are installed at the diagonal positions of the upper cover plate of the electromagnetic head and the diagonal positions of the upper surface of the fixed mechanism. When the equipment is disassembled as a whole, in order to not affect the disassembly of other zinc pot equipment on site, the overhead crane is first connected to the lifting ring of the fixed mechanism through a lifting chain. After removing the four sets of screws (a total of 16) between the upper platform of the fixed mechanism and the four supports or the nuts (a total of 16) between the four supports and the anchor bolts, the overhead crane lifts the electromagnetic head and the fixed mechanism as a whole away from the work area. The overhead crane is connected to the lifting ring of the electromagnetic head through a lifting chain, and the electromagnetic head can be removed from the fixed mechanism after removing the two sets of screws (a total of 8) between the front right-angle plate and the upper surface of the fixed mechanism.

[0209] The preliminary design of the heat insulation device adopts forced air cooling + heat insulation cotton. The air enters from both sides of the electromagnetic head, and the outer shell of the electromagnetic head close to the operating room is designed with 5 rows of ventilation holes as air outlets. The heat insulation cotton is placed on the inner side of the bottom plate of the electromagnetic head. Considering the wind pressure loss, the fan is selected as a high-pressure fan.

[0210] Considering that the temperature of zinc liquid is about 450℃, the air supply pipe adopts high temperature resistant metal hose, the diameter is selected as DN100 series, and the length is 3m. The connection with the electromagnetic head adopts a 90° elbow quick release connector for easy connection. Two high temperature resistant metal hoses are connected to the 5m metal hose through a 3-way connector. The other end of the 5m metal hose is connected to the high pressure blower through a reducer.

[0211] In order to conduct temperature testing, an electromagnetic head simulation device was initially processed according to the size of the electromagnetic head, with air intakes on both sides. Five rows of ventilation holes were designed on the outer shell of the electromagnetic head close to the operating room as air outlets, and thermal insulation cotton was placed on the inner side of the bottom plate of the electromagnetic head.

[0212] When the heat source temperature is 500-600℃, the distance is 40cm, the ambient temperature at the high-pressure fan inlet is 50℃, and the temperature sensor inside the electromagnetic head measures the ambient temperature as 75.2℃, it is preliminarily proved that the air cooling mode is feasible.

[0213] The offline slag driving experiment process is as follows:

[0214] Since there is no liquid metal environment, a 14mm thick aluminum plate with an outer diameter of 300mm was used to perform metal simulation verification experiments at 1Hz, 2Hz, 8Hz, and 10Hz. The experiment found that the aluminum plate can be driven at all frequencies, and the best effect is achieved when the drive frequency is 8-10Hz.

[0215] Those skilled in the art will appreciate that the above are only preferred embodiments of the present invention, and the various embodiments of the present disclosure and / or the features described in the claims may be combined or combined in various ways, even if such combinations or combinations are not explicitly described in the present disclosure. It is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or perform equivalent substitutions on some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

[0216] Although preferred embodiments of the present invention have been described, additional changes and modifications may be made to these embodiments by those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for electromagnetic slag removal in hot-dip galvanizing pot, characterized in that: The electromagnetic slag driving method for hot-dip galvanizing zinc pot is: S1. Design the winding method of electromagnetic winding; S2. Based on S1, a winding method of the electromagnetic winding is designed, the electromagnetic winding is placed above the surface of the zinc liquid through a prototype fixing unit, and a variable current is passed through the electromagnetic winding to generate a traveling wave magnetic field, and a traveling wave magnetic field model is established; S3. Using a traveling wave magnetic field generator to control the traveling wave magnetic field model, performing simulation analysis on the traveling wave magnetic field model, determining the phase change of the traveling wave magnetic field model, and generating an induced electromotive force and an induced current in the zinc liquid according to the phase change of the traveling wave magnetic field model; the induced current generates an Ampere force under the action of the magnetic field, and the zinc liquid moves in a directional manner under the action of the Ampere force, thereby completing the contactless slag removal process.

2. The electromagnetic slag removal method for hot-dip galvanizing zinc pot according to claim 1, characterized in that: The electromagnetic winding is in a flat plate shape.

3. The electromagnetic slag driving method for hot-dip galvanizing zinc pot according to claim 1, characterized in that: The method for designing the winding method of the electromagnetic winding in S1 includes determining the relationship between the electromagnetic winding and the input current and voltage of the power supply and realizing the winding method of the electromagnetic slag driving head.

4. The electromagnetic slag driving method for hot-dip galvanizing zinc pot according to claim 3, characterized in that: The method for determining the relationship between the electromagnetic winding and the power supply input current and voltage is: Where f is the frequency, w1 is the number of turns per phase of the winding, K dp1 is the winding coefficient, B δ1 is the magnetic flux density, τ is the pole pitch, l δ is the effective side length of the coil.

5. The electromagnetic slag driving method for hot-dip galvanizing zinc pot according to claim 3, characterized in that: The winding method of the electromagnetic slag driving head is realized by adopting a concentrated winding structure.

6. The electromagnetic slag driving method for hot-dip galvanizing zinc pot according to claim 1, characterized in that: The method of generating the traveling wave magnetic field in S2 is: Among them, v a (t) is the voltage of phase a, v b (t) is the voltage of phase b, v c (t) is the c-phase voltage, is the voltage amplitude, x is a complex number, e is the base of the natural logarithm, j is the imaginary unit, and w is the angular frequency.

7. The electromagnetic slag removal method for hot-dip galvanizing zinc pot according to claim 1, characterized in that: After the simulation analysis of the traveling wave magnetic field model is performed in S3, the step of verifying the traveling wave magnetic field model is also included.

8. An electromagnetic slag removal device for hot-dip galvanizing pot, characterized in that: The electromagnetic slag removal device for hot-dip galvanizing zinc pot comprises an electromagnetic slag removal unit, a control unit, a heat insulation unit, a prototype fixing unit, a host computer, and a slag removal robot; The electromagnetic slag driving unit is used to generate a magnetic field to generate an induced eddy current with the zinc liquid, so that the zinc liquid is subjected to an electromagnetic force; The control unit is used to execute the steps of the method according to any one of claims 1 to 7; The thermal insulation unit is used to thermally insulate the device; The prototype fixing unit is used to fix the prototype; The host computer is used to obtain the operating parameters of the electromagnetic slag driving device and display the monitoring screen in real time; The slag removal robot is used to specifically perform slag removal operations.

9. The electromagnetic slag removal device for hot-dip galvanizing zinc pot according to claim 8, characterized in that: The prototype fixing unit adopts a cantilever beam structure to fix the prototype.

10. The electromagnetic slag removal device for hot-dip galvanizing pot according to claim 9, characterized in that: The cantilever beam structure is fixed to the ground by anchor bolts.

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