An electromagnetic stirring method and apparatus for adaptive continuous casting slab width

Abstract

This invention discloses an electromagnetic stirring method for adaptively adjusting the width of continuously cast slabs. The method comprises multiple independent stirring modules, each independently connected and disconnected. A displacement sensor is used on the outer side of the narrow face of the crystallizer to measure the position of the narrow face in real time, thereby calculating the current width of the continuously cast slab. The number of stirring modules connected is selected based on the measured width of the slab, ensuring that the effective area of ​​the electromagnetic stirrer covers the width of the slab. This invention also discloses an electromagnetic stirring device for adaptively adjusting the width of continuously cast slabs. This invention achieves better stirring results and promotes stable operation of continuous casting equipment, facilitating the stable production of high-quality slabs.

Description

Technical Field

[0001] This invention relates to continuous casting slab production technology, and more specifically, to an electromagnetic stirring method and apparatus that adapts to the width of continuously cast slabs. Background Technology

[0002] In metal slab production, electromagnetic stirring is typically applied to the molten metal within the crystallizer to improve the surface and internal quality of the slab. The basic principle of electromagnetic stirring is to induce an alternating magnetic field by passing an alternating current through the stirrer. This alternating magnetic field induces a current in the molten metal, generating a Lorentz force between the induced current and the alternating magnetic field. Under the influence of this Lorentz force, the molten metal flows along the direction of the net external force. On one hand, the flow field under electromagnetic stirring washes away the solid-liquid interface, facilitating the removal of inclusions, bubbles, and other defects, thus improving the quality of the slab. On the other hand, electromagnetic stirring homogenizes the composition and temperature of the molten metal and increases the solidification nuclei at the solid-liquid interface, which helps refine the slab grains and increase the equiaxed grain ratio. Given the positive effect of electromagnetic stirring on slab quality, extensive research has been conducted, and many patented technologies have been proposed.

[0003] For example, Chinese patent applications 201080019323 and 201080019325 propose a novel electromagnetic stirring method that employs two pairs of magnetic poles, with the upper pole electromagnetically stirring the molten steel and the lower pole electromagnetically braking it. Chinese patent application 201710013707.X proposes an adaptive electromagnetic stirring method for varying casting speeds. In this method, the crystallizer uses upper-end electromagnetic stirring and lower-end electromagnetic braking. The electromagnetic braking consists of multiple independent control components, which can automatically adjust the operating mode and electromagnetic force of the electromagnetic stirring and braking according to changes in casting speed, achieving full coverage of casting speed.

[0004] The aforementioned patented technologies optimize the electromagnetic stirring control mode, but do not consider the crystallizer width adjustment control in continuous casting production. On the same continuous casting billet production line, various slab specifications need to be produced, and the crystallizer width needs to be adjusted online according to the production plan. Existing electromagnetic stirring devices are typically designed with the largest slab specification in mind. When the width of the continuously cast billet changes, the effective area of ​​the electromagnetic stirring device is generally not adjusted. When the crystallizer width is narrowed, the width adjustment device is in the electromagnetic stirring area, which may have two adverse effects: First, the mechanical structure of the width adjustment device may heat up under the influence of the alternating magnetic field, potentially causing stress deformation and hindering stable equipment operation. Second, the signal lines or sensors of the width adjustment device may malfunction or fail due to interference from the stirring magnetic field, potentially preventing online crystallizer width adjustment control and affecting the operating efficiency and product quality stability of the continuous casting machine. To reduce the signal interference of electromagnetic stirring on the width modulation device, the cables and signal lines of the width modulation device generally need to be redesigned to bypass the electromagnetic signal interference area. This imposes more constraints on the structural design of the width modulation device and causes many inconveniences to its installation, application and maintenance. Summary of the Invention

[0005] In view of the deficiencies in the existing technology, the purpose of this invention is to provide an electromagnetic stirring method and device that adapts to the width of continuously cast slabs, which can not only achieve better stirring effect, but also promote the stable operation of continuous casting equipment, and facilitate the stable production of high-quality slabs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The first aspect of this invention provides an electromagnetic stirring method for adaptive continuous casting slab width:

[0008] The electromagnetic stirrer is configured as multiple independent stirrer modules, and each stirrer module is independently connected and disconnected;

[0009] A displacement sensor is used on the outside of the narrow face of the crystallizer to measure the position of the narrow face of the crystallizer in real time in order to calculate the width of the current continuous casting slab;

[0010] The number of agitator modules connected is selected based on the measured width of the continuously cast slab, so that the effective area of ​​the electromagnetic agitator covers the width area of ​​the continuously cast slab.

[0011] Preferably, the electromagnetic stirring method specifically includes the following steps:

[0012] S1. Calibrate the gear position of the electromagnetic stirrer and the corresponding total width L_stir of the electromagnetic stirrer, the thickness Lz of the narrow surface of the crystallizer, and the total distance L between the displacement sensors on both sides of the narrow surface of the crystallizer.

[0013] S2. Set the width of the initial continuous casting slab;

[0014] S3. Real-time detection of the distance Ls between the displacement sensor and the narrow surface of the crystallizer;

[0015] S4. Calculate in real time the difference ΔLs between the current distance Ls between the displacement sensor and the narrow surface of the crystallizer and the previous distance, and give the gear adjustment direction; at the same time, calculate in real time the current width of the continuous casting slab and select the width of the working area of ​​the agitator module.

[0016] S5, Execute gear adjustment control.

[0017] Preferably, in step S3, the real-time calculation of the distance Ls between the current displacement sensor and the narrow surface of the crystallizer and the distance difference ΔLs between the two moments specifically includes:

[0018] The displacement sensor measures the current distance Ls(t) between itself and the narrow face of the crystallizer, and the distance Ls(t-Δt) between them at the previous moment, to obtain the distance difference ΔLs.

[0019] Preferably, in step S3, specifying the gear adjustment direction includes:

[0020] If ΔLs < 0, the width of the continuously cast slab is adjusted from narrow to wide, and the gear adjustment is to increase the number of agitator modules;

[0021] If ΔLs>0, the width of the continuously cast slab is adjusted from wide to narrow, and the gear adjustment is to reduce the number of agitator modules;

[0022] If ΔLs = 0, the width of the continuously cast slab remains unchanged, and therefore no gear adjustment is required.

[0023] Preferably, in step S3, the width L_slab of the continuously cast slab is calculated in real time as follows:

[0024] L_slab = L-2(Lz+Ls).

[0025] Preferably, in step S3, selecting the width of the effective area of ​​the stirrer module specifically includes:

[0026] The difference ΔL between the current width L_slab of the continuously cast slab and the total width L_stir of the electromagnetic stirrers corresponding to all gear positions is calculated in real time. The calculation formula is as follows:

[0027] ΔL=|L_stir-L_slab|

[0028] The electromagnetic stirrer has 7 speed settings, from 0 to 6, and the total width L_stir of the electromagnetic stirrer is 7. The speed setting corresponding to the minimum difference ΔL is found by using a function, and that speed setting is selected as the target speed setting of the electromagnetic stirrer.

[0029] A second aspect of the present invention provides an electromagnetic stirring device for adaptive continuous casting slab width, comprising:

[0030] Two electromagnetic stirrers are provided, each located on the outer side of the wide face of the crystallizer.

[0031] Two displacement sensors are provided, one on the outer side of the narrow face of the crystallizer.

[0032] The intelligent processing unit acquires the measurement data of the displacement sensor, calculates in real time the difference ΔLs between the current distance Ls between the displacement sensor and the narrow surface of the crystallizer and the previous distance, and provides the gear adjustment direction; at the same time, it calculates in real time the current width of the continuous casting slab and selects the width of the working area of ​​the agitator module.

[0033] The electromagnetic stirring device that adapts to the width of the continuously cast slab realizes the electromagnetic stirring method that adapts to the width of the continuously cast slab.

[0034] Preferably, the electromagnetic stirrer includes a housing and a plurality of stirrer modules disposed within the housing.

[0035] Preferably, the stirrer module includes a basic stirrer located in the middle of the outer shell and a plurality of modular stirrers arranged sequentially on the side of the basic stirrer.

[0036] Preferably, the number of modular mixers is 2 to 12.

[0037] Preferably, the electromagnetic stirrer has 7 speed settings, which correspond to the total width L_stir of the electromagnetic stirrer as follows:

[0038] When the electromagnetic stirrer is set to level 0, the total width of the electromagnetic stirrer L_stir = L0.

[0039] When the electromagnetic stirrer is set to level 1, the total width of the electromagnetic stirrer is L_stir = L0 + 2L1.

[0040] When the electromagnetic stirrer is set to level 2, the total width of the electromagnetic stirrer is L_stir = L0 + 2(L1 + L2);

[0041] When the electromagnetic stirrer is set to level 3, the total width of the electromagnetic stirrer is L_stir = L0 + 2(L1 + L2 + L3).

[0042] When the electromagnetic stirrer is set to level 4, the total width of the electromagnetic stirrer is L_stir = L0 + 2(L1 + L2 + L3 + L4).

[0043] When the electromagnetic stirrer has 5 speed settings, the total width of the electromagnetic stirrer is L_stir = L0 + 2(L1 + L2 + L3 + L4 + L5);

[0044] When the electromagnetic stirrer has 6 speed settings, the corresponding total width of the electromagnetic stirrer is L_stir = L0 + 2(L1 + L2 + L3 + L4 + L5 + L6).

[0045] L0 is the width of the basic mixer, and L1, L2, L3, L4, L5, and L6 are the widths of the modular mixers, respectively.

[0046] Preferably, the displacement sensor is mounted on the outside of the narrow face of the crystallizer via a fixed bracket.

[0047] The electromagnetic stirring method and apparatus for adaptive continuous casting slab width provided by this invention have the following beneficial effects:

[0048] 1) The electromagnetic stirring method of the present invention for adaptive continuous casting slab width can realize automatic control of electromagnetic stirring for the entire slab width, and improve the stability of the stirring process during the crystallizer width adjustment process.

[0049] 2) The magnetic field generated by the electromagnetic stirring method device for adaptive continuous casting slab width of the present invention mainly acts on the stirring of liquid steel, with less interference to surrounding equipment and instruments, thus improving the process compatibility of the electromagnetic stirring device.

[0050] 3) The electromagnetic stirrer adopts a multi-modal design, which can automatically select the stirrer module to be put into the casting according to the width of the casting slab. There is no electromagnetic stirring effect in the non-cast slab area, which improves the efficiency of electromagnetic stirring and is easy to realize automatic control. Attached Figure Description

[0051] Figure 1 This is a flowchart of the electromagnetic stirring method of the present invention;

[0052] Figure 2 This is a schematic diagram of the electromagnetic stirring device of the present invention, (a) is an axial view, (b) is a top view, and (c) is a calibration diagram;

[0053] Figure 3 This is a schematic diagram of the electromagnetic stirrer in the electromagnetic stirring device of the present invention;

[0054] Figure 4This is a schematic diagram of the stirrer module in the electromagnetic stirring device of the present invention, (a) is an axial view, (b) is a top view, and (c) is a calibration diagram;

[0055] Figure 5 This is a schematic diagram of the electromagnetic stirring method of the present invention. (a) is a schematic diagram of electrical connection, and (b) is a schematic diagram of the arrangement of the stirrer module. Detailed Implementation

[0056] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0057] This invention provides an electromagnetic stirring method for adaptive continuous casting slab width:

[0058] The electromagnetic stirrer 5 is configured as multiple independent stirrer modules, each of which can be connected and disconnected independently;

[0059] A displacement sensor 6 is used on the outside of the narrow face 2 of the crystallizer to measure the position of the narrow face of the crystallizer in real time, thereby calculating the width of the current continuous casting slab;

[0060] The number of agitator modules is selected based on the width of the continuously cast slab, so that the effective area of ​​the electromagnetic agitator 5 covers the width of the continuously cast slab.

[0061] Combination Figure 1 and Figure 2 As shown, the electromagnetic stirring method of the present invention specifically includes the following steps:

[0062] S1. Before operation, first calibrate the gear position of the electromagnetic stirrer 5 and the total width L_stir of the electromagnetic stirrer corresponding to the gear position, the thickness Lz of the narrow surface 2 of the crystallizer, and the total distance L between the displacement sensors 5 on both sides of the narrow surface 2 of the crystallizer.

[0063] S2. Set the width of the initial continuous casting slab;

[0064] S3. During the continuous casting process, the distance Ls between the displacement sensor 6 and the narrow surface 2 of the crystallizer is detected in real time by the displacement sensor 6, and the detection data is sent to the intelligent processing unit.

[0065] S4. The intelligent processing unit calculates in real time the difference ΔLs between the current distance Ls between the displacement sensor 6 and the narrow surface 2 of the crystallizer and the distance ΔLs of the previous moment, and gives the gear adjustment direction; at the same time, it calculates in real time the width of the current continuous casting slab and selects the appropriate width of the working area of ​​the agitator module.

[0066] S5. The intelligent processing unit issues adjustment commands and executes gear adjustment control to achieve electromagnetic stirring that adapts to the width of the continuously cast slab.

[0067] In step S3 above, the real-time calculation of the distance Ls between the current displacement sensor and the narrow surface of the crystallizer and the distance difference ΔLs between the two moments specifically includes:

[0068] The displacement sensor measures the current distance Ls(t) between the crystallizer and the narrow face of the crystallizer, and the distance Ls(t-Δt) between the two moments, to obtain the distance difference ΔLs.

[0069] In step S3 above, the specific directions for gear adjustment include:

[0070] When the width of the continuously cast slab changes, if ΔLs < 0, it means that the width of the continuously cast slab is adjusted from narrow to wide. The gear adjustment is to increase the number of agitator modules. The intelligent processing unit calculates the current width L_slab of the continuously cast slab and calculates the total width of electromagnetic agitator 5 that is closest to the current width of the continuously cast slab. The corresponding optimal electromagnetic agitator 5 gear is selected, and the number of agitator modules to be put into operation is automatically selected through the automatic circuit breaker.

[0071] If ΔLs>0, it means that the width of the continuous casting slab is adjusted from wide to narrow. The gear adjustment is to reduce the number of agitator modules. The intelligent processing unit calculates the current width L_slab of the continuous casting slab, calculates the total width of electromagnetic agitator 5 that is closest to the current width of the continuous casting slab, selects the corresponding optimal electromagnetic agitator 5 gear, and issues a stop command to the agitator modules outside the optimal agitation range through the automatic circuit breaker.

[0072] If ΔLs=0, it means that the width of the continuously cast slab remains stable and the electromagnetic stirrer 5 maintains its current state, so there is no need to perform gear adjustment.

[0073] In step S3 above, the width L_slab of the current continuously cast slab is calculated in real time as follows:

[0074] L_slab = L-2(Lz+Ls)

[0075] In the formula, L is the total distance between the displacement sensors 6 on both sides of the narrow surface 2 of the crystallizer, which is fixed. Lz is the thickness of the narrow surface 2 of the crystallizer. Ls is the distance between the displacement sensor 6 and the narrow surface 2 of the crystallizer, which is measured in real time.

[0076] In step S3 above, selecting the width of the working area of ​​the agitator module specifically includes:

[0077] The difference ΔL between the current width L_slab of the continuously cast slab and the total width L_stir of the electromagnetic stirrers corresponding to all gear positions is calculated in real time. The calculation formula is as follows:

[0078] ΔL=|L_stir-L_slab|

[0079] The electromagnetic stirrer 5 has 7 speed settings, from 0 to 6. The total width L_stir of the electromagnetic stirrer 5 is 7. The speed setting corresponding to the minimum difference ΔL is found by using a function, and that speed setting is selected as the target speed setting of the electromagnetic stirrer 5.

[0080] The seven speed settings of the electromagnetic stirrer 5 correspond to the total width L_stir of the electromagnetic stirrer 5 as follows:

[0081] When the setting of the electromagnetic stirrer 5 is 0, the total width of the electromagnetic stirrer 5 is L_stir=L0;

[0082] When the setting of the electromagnetic stirrer 5 is 1, the total width of the electromagnetic stirrer 5 is L_stir=L0+2L1;

[0083] When the setting of the electromagnetic stirrer 5 is 2, the total width of the electromagnetic stirrer 5 is L_stir=L0+2(L1+L2);

[0084] When the setting of the electromagnetic stirrer 5 is 3, the total width of the electromagnetic stirrer 5 is L_stir=L0+2(L1+L2+L3).

[0085] When the electromagnetic stirrer 5 is set to level 4, the total width of the electromagnetic stirrer 5 is L_stir=L0+2(L1+L2+L3+L4).

[0086] When the setting of the electromagnetic stirrer 5 is 5, the total width of the electromagnetic stirrer 5 is L_stir=L0+2(L1+L2+L3+L4+L5).

[0087] When the setting of the electromagnetic stirrer 5 is 6, the total width of the electromagnetic stirrer 5 is L_stir=L0+2(L1+L2+L3+L4+L5+L6).

[0088] Combination Figures 2 to 5 As shown, the present invention also provides an electromagnetic stirring device for adaptive continuous casting slab width, comprising:

[0089] Two electromagnetic stirrers 5 are provided, one on the outer side of the wide surface 1 of the crystallizer and the other near the upper end of the wide surface 1 of the crystallizer.

[0090] Two displacement sensors 6 are respectively mounted on the two outer sides of the narrow surface 2 of the crystallizer via a fixing bracket 7.

[0091] The intelligent processing unit acquires the measurement data of the displacement sensor 6, calculates in real time the difference ΔLs between the current distance Ls between the displacement sensor 6 and the narrow surface 2 of the crystallizer and the distance ΔLs at the previous moment, and gives the gear adjustment direction; at the same time, it calculates in real time the width of the current continuous casting slab and selects the width of the working area of ​​the agitator module 8.

[0092] The electromagnetic stirring method of the present invention, which adapts to the width of the continuously cast slab, is realized by using the electromagnetic stirring device of the present invention.

[0093] The electromagnetic stirrer 5 includes a housing 9 and multiple stirrer modules 8 disposed within the housing.

[0094] The mixer module 8 includes a basic mixer 8-0 located in the middle of the outer casing 9 and multiple modular mixers 8-1, 8-2, 8-3, 8-4, 8-5, and 8-6 arranged sequentially on the side of the basic mixer 8-0.

[0095] The total number of modular mixers 8 can be set from 2 to 12.

[0096] Example

[0097] See again Figures 2 to 5 As shown, electromagnetic stirrers 5 are installed on both sides of the wide face 1 of the continuous casting crystallizer. Displacement sensors 6 are installed on both sides of the narrow face 2 of the crystallizer, and the displacement sensors 6 are mounted on fixed brackets 7. The distance L between the two displacement sensors 6 is fixed and needs to be calibrated after each equipment installation as a reference position. The thickness Lz of the narrow face 2 of the crystallizer remains unchanged.

[0098] The electromagnetic stirrer 5 on one side of the crystallizer's wide face 1 mainly includes a housing 9 and multiple stirrer modules 8 housed within the housing. The stirrer modules 8 include a basic stirrer 8-0 and multiple modular stirrers 8-1, 8-2, 8-3, 8-4, 8-5, and 8-6. The basic stirrer 8-0 and the modular stirrers 8-1, 8-2, 8-3, 8-4, 8-5, and 8-6 are all connected in parallel to the electrical circuit via an automatic circuit breaker. The control principle is as follows: Figure 5 As shown.

[0099] The basic agitator 8-0 has a width of L0 and is installed in the middle of the outer casing 9. It is suitable for agitating continuously cast slabs with a minimum width of L0. When the automatic circuit breaker K0 is closed, the total width of the agitator is L_stir=L0, and the agitator gear is recorded as gear 0.

[0100] Modular mixers are symmetrically distributed on both sides of the basic mixer 8-0. The widths of modular mixers 8-1, 8-2, 8-3, 8-4, 8-5, and 8-6 are L1, L2, L3, L4, L5, and L6, respectively. When adding or removing modular mixers, the number of modular mixers added or removed is always an even number.

[0101] When the basic mixer 8-0 and its two left and right modular mixers 8-1 are put into operation, the automatic circuit breakers K0 and K1 are closed, the total width of the electromagnetic mixer 5 is L_stir=L0+2L1, and the mixer speed is recorded as speed 1.

[0102] When the basic mixer 8-0, its two left and right modular mixers 8-1 and 8-2 are engaged, the automatic circuit breakers K0, K1 and K2 are closed, the total width of the electromagnetic mixer 5 is L_stir=L0+2(L1+L2), and the mixer speed is recorded as 2.

[0103] When the basic mixer 8-0, its two left and right modular mixers 8-1, its two left and right modular mixers 8-2 and its two left and right modular mixers 8-3 are engaged, the automatic circuit breakers K0, K1, K2 and K3 are closed, the total width of the electromagnetic mixer 5 is L_stir=L0+2(L1+L2+L3), and the mixer speed is recorded as 3 speeds.

[0104] When the basic mixer 8-0, its two left and right modular mixers 8-1, 8-2, 8-3, and 8-4 are engaged, the automatic circuit breakers K0, K1, K2, K3, and K4 are closed. The total width of the electromagnetic mixer 5 is L_stir = L0 + 2(L1 + L2 + L3 + L4), and the mixer speed is recorded as 4 speeds.

[0105] When the basic mixer 8-0, its two left and right modular mixers 8-1, 8-2, 8-3, 8-4, and 8-5 are engaged, the automatic circuit breakers K0, K1, K2, K3, K4, and K5 are closed. At this time, the total width of the electromagnetic mixer 5 is L_stir = L0 + 2(L1 + L2 + L3 + L4 + L5), and the mixer speed is recorded as 5 speeds.

[0106] When the basic mixer 8-0, its two left and right modular mixers 8-1, 8-2, 8-3, 8-4, 8-5, and 8-6 are engaged, the automatic circuit breakers K0, K1, K2, K3, K4, K5, and K6 are closed. The total width of the electromagnetic mixer 5 is L_stir = L0 + 2(L1 + L2 + L3 + L4 + L5 + L6), and the mixer speed is recorded as 6 speeds.

[0107] Before continuous casting begins, the initial width of the continuous casting slab is set according to the production plan. The intelligent processing unit calculates and selects the total width of the initial electromagnetic stirrer 5, and connects the selected stirrer module to operation by closing the automatic circuit breaker at the corresponding position.

[0108] During continuous casting, the displacement sensor 6 measures the current width of the continuously cast slab in real time. The intelligent processing unit calculates the adjustment direction of the electromagnetic stirrer 5 in real time and selects the appropriate setting for the electromagnetic stirrer 5, ensuring that the total width of the electromagnetic stirrer 5 is approximately the same as or closest to the width of the continuously cast slab. The specific control method is as follows:

[0109] During continuous casting, displacement sensor 6 measures the distance Ls between itself and the narrow face 2 of the crystallizer in real time, and sends the measurement data to the intelligent processing unit. If the current distance between displacement sensor 6 and the narrow face 2 of the crystallizer is Ls_(t), and the previous distance between displacement sensor 6 and the narrow face 2 of the crystallizer was Ls_(t-Δt), the intelligent processing unit calculates the distance difference ΔLs=Ls_(t)-Ls_(t-Δt) in real time.

[0110] If ΔLs < 0, it indicates that the width of the continuously cast slab is being widened, and the electromagnetic stirrer's 5th setting needs to be increased. At this time, the intelligent processing unit calculates the current continuously cast slab width L_slab = L - 2(Lz + Ls), and calculates the difference ΔL = |L_stir - L_slab| between the real-time calculated slab width L_slab and the total width L_stir of each electromagnetic stirrer 5 setting. The stirring setting corresponding to the minimum value is then identified as the target setting. The intelligent processing unit sends a command to the automatic circuit breaker, closing the circuit breaker corresponding to the current electromagnetic stirrer 5 setting up to the target setting, while keeping the other circuit breakers unchanged, thus achieving accurate control of the electromagnetic stirring area under slab width adjustment conditions.

[0111] If ΔLs > 0, it indicates that the width of the continuously cast slab is being adjusted from wide to narrow, and the electromagnetic stirrer's 5th setting needs to be reduced. The intelligent processing unit calculates the difference between the slab width L_slab and the total width L_stir of the electromagnetic stirrer 5 at each stirring setting in real time, and calculates ΔL = |L_stir - L_slab| to find the stirring setting corresponding to the minimum value, which is then used as the target setting. The intelligent processing unit sends a command to the automatic circuit breaker to disconnect the circuit breaker corresponding to the setting from the current electromagnetic stirrer 5 to the previous setting, thus realizing the adjustment and control of the electromagnetic stirring zone under the condition of slab width adjustment.

[0112] If ΔLs=0, it means that the width of the continuously cast slab has not changed, the current automatic circuit breaker status of each electromagnetic stirrer 5 remains unchanged, and the number of stirrer modules currently in operation remains unchanged.

[0113] In this embodiment of the electromagnetic stirring method and apparatus for adaptive continuous casting slab width, the number of basic stirrers 8-0 is one, and its width L0 can be determined according to the minimum slab width compatible with the continuous casting machine. L0 can be taken in the range of 800 to 1600 mm.

[0114] In mixer module 8, modular mixers 8-1, 8-2, 8-3, 8-4, 8-5, and 8-6 can be identical or different, and their specifications and dimensions can be selected according to the actual plate width adjustment range. The number of modular mixers can be selected between 2 and 12. The width of a single modular mixer can be selected within the range of 100 to 800 mm.

[0115] The electromagnetic stirring method and apparatus for adaptive continuous casting slab width in this embodiment realizes adaptive adjustment and control of electromagnetic stirring during the slab width adjustment process. It can achieve accurate control of the stirring area, stabilize the continuous casting stirring process, reduce the interference of the electromagnetic stirring device on the surrounding equipment, and facilitate the smooth operation of the continuous casting equipment.

[0116] The electromagnetic stirring method and apparatus for adaptive continuous casting slab width in this embodiment can realize adaptive adjustment of electromagnetic stirring during the continuous casting width adjustment process, reduce the interference of electromagnetic stirring device on the width adjustment device, and achieve stable stirring in the continuous casting slab area. It plays an important role in stabilizing the production process and improving product quality, and has good application prospects.

[0117] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. An electromagnetic stirring method for adaptive continuous casting slab width, characterized in that: The electromagnetic stirrer is configured as multiple independent stirrer modules, and each stirrer module is independently connected and disconnected; A displacement sensor is used on the outside of the narrow face of the crystallizer to measure the position of the narrow face of the crystallizer in real time in order to calculate the width of the current continuous casting slab; The number of agitator modules connected is selected based on the measured width of the continuous casting slab, so that the effective area of ​​the electromagnetic agitator covers the width area of ​​the continuous casting slab. The electromagnetic stirring method specifically includes the following steps: S1. Calibrate the gear position of the electromagnetic stirrer and the corresponding total width L_stir of the electromagnetic stirrer, the thickness Lz of the narrow surface of the crystallizer, and the total distance L between the displacement sensors on both sides of the narrow surface of the crystallizer. S2. Set the width of the initial continuous casting slab; S3. Real-time detection of the distance Ls between the displacement sensor and the narrow surface of the crystallizer; S4. Calculate in real time the difference ΔLs between the current distance Ls between the displacement sensor and the narrow surface of the crystallizer and the previous distance, and give the gear adjustment direction; at the same time, calculate in real time the current width of the continuous casting slab and select the width of the working area of ​​the agitator module. S5, Perform gear adjustment control; In step S4, specifying the gear adjustment direction includes: If ΔLs < 0, the width of the continuously cast slab is adjusted from narrow to wide, and the gear adjustment is to increase the number of agitator modules; If ΔLs>0, the width of the continuously cast slab is adjusted from wide to narrow, and the gear adjustment is to reduce the number of agitator modules; If ΔLs = 0, the width of the continuously cast slab remains unchanged, and therefore no gear adjustment is required.

2. The electromagnetic stirring method for adaptive continuous casting slab width according to claim 1, characterized in that, In step S4, the width L_slab of the continuously cast slab is calculated in real time as follows: L_slab = L-2(Lz+Ls).

3. The electromagnetic stirring method for adaptive continuous casting slab width according to claim 2, characterized in that, In step S4, selecting the width of the working area of ​​the stirrer module specifically includes: The difference ΔL between the current width L_slab of the continuously cast slab and the total width L_stir of the electromagnetic stirrers corresponding to all gear positions is calculated in real time. The calculation formula is as follows: ΔL=|L_stir-L_slab| The electromagnetic stirrer has 7 speed settings, from 0 to 6, and the total width L_stir of the electromagnetic stirrer is 7. The speed setting corresponding to the minimum difference ΔL is found by using a function, and that speed setting is selected as the target speed setting of the electromagnetic stirrer.

4. An electromagnetic stirring device that adapts to the width of continuously cast slabs, characterized in that, include: Two electromagnetic stirrers are provided, each located on the outer side of the wide face of the crystallizer. Two displacement sensors are provided, one on the outer side of the narrow face of the crystallizer. The intelligent processing unit acquires the measurement data of the displacement sensor, calculates in real time the difference ΔLs between the current distance Ls between the displacement sensor and the narrow surface of the crystallizer and the previous distance, and provides the gear adjustment direction; at the same time, it calculates in real time the current width of the continuous casting slab and selects the width of the working area of ​​the agitator module. The electromagnetic stirring device for adaptive continuous casting slab width realizes the electromagnetic stirring method for adaptive continuous casting slab width as described in any one of claims 1-3.

5. The electromagnetic stirring device for adaptive continuous casting slab width according to claim 4, characterized in that: The electromagnetic stirrer includes an outer shell and multiple stirrer modules disposed within the outer shell.

6. The electromagnetic stirring device for adaptive continuous casting slab width according to claim 5, characterized in that: The stirrer module includes a basic stirrer located in the middle of the outer shell and a plurality of modular stirrers arranged sequentially on the side of the basic stirrer.

7. The electromagnetic stirring device for adaptive continuous casting slab width according to claim 6, characterized in that: The number of modular mixers is 2 to 12.

8. The electromagnetic stirring device for adaptive continuous casting slab width according to claim 7, characterized in that, The electromagnetic stirrer has 7 speed settings, which correspond to the total width L_stir of the electromagnetic stirrer as follows: When the electromagnetic stirrer is set to level 0, the total width of the electromagnetic stirrer L_stir = L0. When the electromagnetic stirrer is set to level 1, the total width of the electromagnetic stirrer is L_stir = L0 + 2L1. When the electromagnetic stirrer is set to level 2, the total width of the electromagnetic stirrer is L_stir = L0 + 2(L1 + L2); When the electromagnetic stirrer is set to level 3, the total width of the electromagnetic stirrer is L_stir = L0 + 2(L1 + L2 + L3). When the electromagnetic stirrer is set to level 4, the total width of the electromagnetic stirrer is L_stir = L0 + 2(L1 + L2 + L3 + L4). When the electromagnetic stirrer is set to level 5, the total width of the electromagnetic stirrer is L_stir = L0 + 2(L1 + L2 + L3 + L4 + L5); When the electromagnetic stirrer has 6 speed settings, the corresponding total width of the electromagnetic stirrer is L_stir = L0 + 2(L1 + L2 + L3 + L4 + L5 + L6). L0 is the width of the basic mixer, and L1, L2, L3, L4, L5, and L6 are the widths of the modular mixers, respectively.

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