CN104942246B - Multidimensional electromagnetic modulating device for electromagnetic stirring of slab crystallizer - Google Patents
Multidimensional electromagnetic modulating device for electromagnetic stirring of slab crystallizer Download PDFInfo
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Abstract
The invention discloses a multidimensional electromagnetic modulating device for electromagnetic stirring of a slab crystallizer. The multidimensional electromagnetic modulating device comprises a stirrer system (1), a crystallizer system (2), metal liquid (3) and a speed measuring system; the stirrer system comprises a PLC control unit and two single-side stirrers distributed on wide faces of two sides of the crystallizer, the single-side stirrers comprise multilayer stirrer units, a magnetic shielding sheet is arranged between the stirrer units arranged on every two layers, the stirrer unit arranged on each layer comprises multiple coils and magnet yokes, the PLC control unit is connected with coil taps, the current amplitude and phase positions of the coils are changed, and transverse magnetic field modulation can be achieved; the stirrers on each layer are independently connected to the PLC control unit, so that the longitudinal magnetic field modulation is achieved; the speed measuring system comprises a speed measuring probe and an intelligent processing unit, the speed measuring probe is arranged on narrow faces of the crystallizer, and the flow velocity of the metal fluid in the crystallizer can be measured in the direction of the wide faces; a measured speed signal is sent to the intelligent processing unit by the speed measuring probe, and the signal is processed by the intelligent processing unit and then output to the PLC control unit.
Description
Technical field
The present invention relates to a kind of electromagnetic mixing apparatus of metal slabs crystallizer, more particularly, to a kind of plate slab crystallizer electromagnetism
The multidimensional electromagnetism modulating device of stirring.
Background technology
In metal slabs produce, in order to improve surface and the internal soundness of strand, generally to the liquid gold in crystallizer
Belong to and apply electromagnetic agitation.The ultimate principle of electromagnetic agitation is to produce an alternation by sensing after the internal indirect current of agitator
Magnetic field, this alternating magnetic field can sense generation electric current in liquid metal, produces Lip river between the electric current that sensing produces and alternating magnetic field
Lun Zili.Liquid metal under Lorentz force action, flowed, on the one hand, electromagnetism stirs by the bonding force direction along active force
Flow field under the effect of mixing is washed away to solid-liquid interface, is conducive to the floating of the defects such as field trash, bubble to remove, thus improving
Slab quality；On the other hand, the uniform composition of molten metal and temperature under function composite by electromagnetic stirring, and increased solid-liquid interface
Solidification core, be conducive to refine casting blank crystal grains, improve equiaxial crystal ratio.In view of the facilitation of Magnetic Stirring on Slab Quality,
Electromagnetic agitation is conducted extensive research people it is proposed that many patented technologies.
Chinese patent CN96121903.3 proposes for agitator to be divided into four independent control parts, can apply different electric currents and produce
The Distribution of Magnetic Field of raw different distributions, the method has certain adjustability, but this agitator only can achieve lateral adjustments, does not examine
Consider slab in longitudinal difference.
The electromagnetic mixing apparatus that Chinese patent CN87104014 proposes produce helical magnetic field, are conducive to bubble and field trash
Float, can be used for the electromagnetic agitation of square billet and round billet, its whipped form and acting in sheet billet continuous casting of stream field exist necessarily
Limitation.
The helical magnetic field agitating device that Chinese patent CN200910211558.3 proposes is used for the metallurgical smelting of composite,
And it is applied to circular melting furnace, be not belonging to plate slab crystallizer stirring field.Chinese patent CN86101657, Chinese patent
The stirring technique that CN200910226351.3, United States Patent (USP) US4582110, United States Patent (USP) US5279351A propose is rotary magnetic
Field generating meanss, for the electromagnetic agitation of square billet and round billet, are unsuitable for the stirring of sheet billet continuous casting process.
Chinese patent CN200910302486.3 propose a kind of can achieve single rotation, electromagnetic deceleration, electromagnetism accelerate, two
Area's rotation and 4th area rotate the induction apparatuss of this five kinds of stir modes, and these shaping modes are that two-dimensional magnetic field is adjusted, only in essence
The Distribution of Magnetic Field of cross section can be changed, and longitudinally then cannot adjust.In addition, slab corner is crackle Yi Fa area, this five kinds of moulds
Formula all flexibly cannot adjust the stirring magnetic field in slab corner effectively.
Chinese patent CN200780041938.6 proposes a kind of new electromagnetic agitation method, using two sets of coils, a set of
Rotating excitation field is produced on cross section, another set of this method can achieve 3 D electromagnetic stirring in longitudinally generation shifting magnetic field, but
It is primarily adapted for use in round billet electromagnetic agitation, slab electromagnetic agitation is not yet realized.
Electromagnetic agitation method and device that above patent refers to, are only limitted to two-dimensional electromagnetic stirring or square billet and round billet stirring,
Cannot realize local is stirred with the fine setting in magnetic field, pole limited to the regulating power of crystallizer inner corner portion or localized metallic liquid dead band
Easily become be mingled with or pore district occurred frequently；Secondly, although current plate slab crystallizer electromagnetic agitating technology achieves certain application
Effect, but still suffer from the unstable problem of slab quality, is mingled with, the defect such as pore can often occur, electromagnetic agitation effect needs
In improving further；The strand of heterogeneity, specification, for sheet billet continuous casting, can be produced on same conticaster, continuous casting
Technological parameter there is also certain difference, and therefore M-EMS technique also will be adjusted correspondingly, therewith for crystallization
Ground flow field in device, need to take measures to carry out the magnetic field adjustment of entirety or local in the horizontal direction and the vertical direction, and at present still
The methods and techniques that no multidimensional magnetic field is modulated, are unfavorable for the raising of slab quality.
Content of the invention
It is an object of the invention to provide a kind of multidimensional electromagnetism modulating device of plate slab crystallizer electromagnetic agitation, this modulation dress
Put the magnetic field modulation function of enabling in horizontal plane direction and vertical direction, thus adjust entirety or local magnetic field in crystallizer dividing
Cloth structure, reaches optimization distribution of electromagnetic force, and then improves equiaxial crystal ratio, realizes the steady production of high-quality slab.
In order to realize above-mentioned technical purpose, the present invention adopts the following technical scheme that：
A kind of multidimensional magnetic field modulating device of plate slab crystallizer electromagnetic agitation, including crystallizer system and molten metal, crystallizes
Device system includes crystallizer width face, leptoprosopy and submersed nozzle, and crystallizer system is built with molten metal；Described magnetic field modulation device
Also include agitator system and velocity-measuring system；
Described agitator system includes PLC control unit and two unilateral agitators, and two unilateral agitators are distributed respectively
On the wide face of crystallizer system both sides, unilateral agitator includes multilamellar agitator unit, arranges magnetic between two-layer agitator unit
Shielding piece, agitator unit is coated with agitator shell, and every layer of agitator unit includes multiple coils and yoke, and PLC controls
Unit connects coil tap, changes coil windings size of current and phase place enables transverse magnetic field modulation；Every layer of agitator unit
Independent connection PLC control unit, for the regulation of longitudinal magnetic field；
Described velocity-measuring system includes holes probe and intelligent processing unit, and holes probe is arranged on crystallizer leptoprosopy, energy
Along the metal flow velocity in wide face direction in measurement crystallizer；The rate signal of measurement is sent to Intelligent treatment list by holes probe
Unit, exports after being processed by intelligent processing unit to the PLC control unit of agitator system.
Described holes probe sets up two rows along the Vertical Square of crystallizer leptoprosopy, often row's holes probe quantity and agitator
The number of plies of unit is identical.
Described holes probe is located at the center of every layer of agitator unit vertical direction, inside crystallizer width face.
Described holes probe is ultrasound wave holes probe.
Described PLC control unit connects coil tap, selects agitator coil tap and current phase angle, enables laterally
Crystallizer inner metal liquid entirety circulation stirring on magnetic direction；Realize about the crystallizer inner metal liquid on transverse magnetic field direction
Subregion is stirred；Realize the crystallizer inner metal liquid left, center, right three regional compartmentalization stirring on transverse magnetic field direction；Realize laterally
Crystallizer inner metal liquid first, second, third, fourth regional compartmentalization stirring on magnetic direction.
The multidimensional magnetic field modulating device of the plate slab crystallizer electromagnetic agitation of the present invention mainly includes agitator system, ultrasound wave
Holes probe and intelligent processing unit, agitator system stirs magnetic field generator for crystallizer, is distributed in crystallizer width face both sides,
Its structure can optionally adopt single or multiple lift to be distributed in the height direction, every layer of agitator can independent control, for longitudinal flux
The regulation of field；For every layer of agitator, by changing coil windings size of current and phase place, realize transverse magnetic field modulation work(
Energy.The modulating device of the present invention enables the magnetic field modulation function in horizontal plane direction and vertical direction, thus adjusting crystallizer
Interior entirety or local magnetic field distributed architecture, reach optimization distribution of electromagnetic force, and accurate and effective regulates and controls the purpose of flow field structure and form,
And then reduce slab inclusion defect, improve equiaxial crystal ratio, realize the steady production of high-quality slab.
Compared with prior art, its advantage is the modulating device of the present invention：
1）The multidimensional enabling the horizontally and vertically magnetic field in magnetic field in crystallizer is adjusted, can be according to practical situation
The magnetic field of flexible zones of different.
2）Agitator adopts Multi-layer design, and each layer is independent control, and agitator position need not adjust i.e. within the specific limits
Can self adaptation mouth of a river difference immersion depth.
3）The magnetic field of different distributions form can be modulated, thus meeting the stirring demand in different structure flow field.
4）Magnetic field generator is simple to operate, can be automatically performed flux control function by intelligent processing unit.
5）It is applied to the plate slab crystallizer stirring of different size, species and casting parameters, range is wide.
Brief description
Fig. 1 is the multidimensional magnetic field modulating device structural representation of plate slab crystallizer electromagnetic agitation of the present invention；
Fig. 2 is the unilateral agitator structure schematic diagram of the present invention；
Fig. 3 is that the unilateral agitator of the present invention removes the structural representation after shell；
Fig. 4 is crystallizer system structural representation；
4 kinds of stir mode structural representations that Fig. 5 a, Fig. 5 b, Fig. 5 c and Fig. 5 d enable for agitator system of the present invention,
Wherein：Fig. 5 a entirety single cycle stirring, Fig. 5 b about subregion stirring, Fig. 5 c left, center, right three regional compartmentalization stir, Fig. 5 d tetra- area
Domain subregion stirring；
Fig. 6 is the structural representation of the agitator system self adaptation mouth of a river immersion depth of the present invention；
Fig. 7 is that the right side of Fig. 6 regards schematic diagram；
Fig. 8 is the schematic top plan view of Fig. 6；
Fig. 9 is the schematic perspective view of the agitator system self adaptation mouth of a river immersion depth of the present invention.
In figure：1 agitator system, 2 crystallizer system, 3 molten metals, 4 velocity-measuring systems, 5 agitator shells, 6 coils, 7 magnetic
Yoke, 8 magnetic shield pieces, 9 crystallizer leptoprosopy, 10 crystallizer width faces, 11 mouths of a river.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
A kind of multidimensional magnetic field modulating device of plate slab crystallizer electromagnetic agitation, including crystallizer system 2, molten metal 3, stirring
Device system 1 and velocity-measuring system 4, referring to Fig. 1, crystallizer system 2 includes the wide face of crystallizer 10, leptoprosopy 9 and submersed nozzle 11, knot
The wide face 10 of brilliant device and leptoprosopy 9 are made up of copper coin, and the wide face of both sides crystallizer 10 and both sides crystallizer leptoprosopy 9 constitute crystallizer cavity,
Referring to Fig. 4, crystallizer system 2 is built with molten metal 3.
Described agitator system 1 includes PLC control unit and two unilateral agitators, and two unilateral agitators are distributed respectively
On the wide face 10 of crystallizer system 2 both sides, unilateral agitator includes monolayer agitator unit or multilamellar agitator unit.Two-layer
Between agitator unit, magnetic shield piece 8 is set, to prevent the superposition in magnetic field and counteracting between levels agitator unit, referring to Fig. 2 and
Fig. 3；Agitator unit is coated with agitator shell 5, and every layer of agitator unit includes multiple coils 6 and yoke 7, and PLC controls
Unit connects coil 6 tap, coil 6 and yoke 7 composition magnetic field generator, changes coil 6 winding current size and phase potential energy is real
Existing transverse magnetic field modulation.Every layer of agitator unit independent connection PLC control unit, for the regulation of longitudinal magnetic field.Therefore this stirs
Mix device system 1 and enable crystallizer region multidimensional magnetic field modulation function.Monolayer agitator unit is the spy of multilamellar agitator unit
Example.
Described velocity-measuring system 4 includes holes probe and intelligent processing unit, and described holes probe is ultrasound wave holes probe,
Ultrasound wave holes probe is arranged on crystallizer leptoprosopy 9, and referring to Fig. 1, ultrasound wave holes probe is along the Vertical Square of crystallizer leptoprosopy 9
Set up two rows, often row's ultrasound wave holes probe quantity is identical with the number of plies of agitator unit, and ultrasound wave holes probe is located at
The center of every layer of agitator unit vertical direction, inside the wide face of crystallizer 10, can measure in crystallizer along wide face 10 direction
Molten metal 3 flow velocity；The rate signal of measurement is sent to intelligent processing unit by ultrasound wave holes probe, by intelligent processing unit
Export after process to the PLC control unit of agitator system 1.
Before carrying out sheet billet continuous casting, first pass through Flow Field Distribution and the crystallizer electricity that numerical simulation calculation goes out to meet technological requirement
Magnetic mixing parametric, these flow field parameter and agitator electrical quantity are inputted intelligent processing unit；During sheet billet continuous casting, start agitator
System 1, the ultrasound wave holes probe convection current field data being arranged at the velocity-measuring system 4 of crystallizer leptoprosopy 9 is measured in real time, and on
Reach intelligent processing unit, wherein, ultrasound wave holes probe can measure parallel straight in face 10 wide with crystallizer simultaneously
VELOCITY DISTRIBUTION on line；The real-time speed data of collection is compared by intelligent processing unit with preset data, works as measured data
When inconsistent with preset data, intelligent processing unit will calculate the coil 6 of agitator unit according to actual measurement and default speed difference
The amplitude that electric current need to increase or reduce, and result of calculation is sent to the PLC control unit of agitator system 1；PLC control unit
Result of calculation according to intelligent processing unit adjusts coil 6 electric current of agitator unit（Stir current）, thus realizing crystallizer
The regulation of the crystallizer flow field of system 2.
The magnetic stirrer system 1 of above-mentioned crystallizer adopts multi-layer structure design, on the one hand, every layer of single agitator unit
Stir mode all can independent control, PLC control unit connects coil 6 tap, by selecting agitator coil 6 tap and electric current
Phase angle, realizes the stirring of the different flow field structure of crystallizer inner metal liquid 3 on transverse magnetic field direction, e.g., realizes transverse magnetic field
Crystallizer inner metal liquid entirety circulation stirring on direction, referring to Fig. 5 a, realizes metal in the crystallizer on transverse magnetic field direction
Subregion stirring about liquid, referring to Fig. 5 b, crystallizer inner metal liquid left, center, right three region realized on transverse magnetic field direction is divided
Area stirs, and referring to Fig. 5 c, realizes crystallizer inner metal liquid first, second, third, fourth regional compartmentalization on transverse magnetic field direction
Stirring, first, second, third, fourth region is arranged in order from left to right, referring to Fig. 5 d.According to width of plate slab and Flow Field Distribution
Situation, modulates the stirring magnetic field of different mode.Which kind of stir mode is crystallizer flow field distribution situation is depended on using, passes through
Numerical simulation can get Flow Field Distribution form and feature, under sheet billet continuous casting process conditions, if by overall circulation stirring being only
Flow field uniformity requirement can be met, then preferentially select this stir mode；With the increase of width of plate slab, Flow Field Distribution feature will be sent out
Changing, then according to different Field Characteristics, can be selected for left and right subregion stir mode, the stirring of left, center, right three regional compartmentalization, 4th area
Domain subregion stirring isotype is stirred to the molten metal 3 in crystallizer, thus reaching preferable mixing effect.Stirred by modulation
Mix the magnetic field generator of device unit, can achieve difference flow field structure and the stirring of distribution, not only can achieve crystallizer region entirety
Magnetic field and the control of flow field structure, also can be finely adjusted to local flow field structure and distribution, thus reaching preferable mixing effect.
On the other hand, every layer of agitator unit of multilamellar agitator unit can carry out as needed independent unlatching, closing or
Adjust, this function both can the different mouth of a river of self adaptation 11 immersion depth, referring to vertical in Fig. 6 to Fig. 9, and scalable crystallizer
To Distribution of Magnetic Field.When the mouth of a river 11 immersion depth changes, agitator position need not be moved, select in turn on agitator unit
If one layer or dried layer it is ensured that stirring the magnetic field covering mouth of a river 11 outlet top molten metal 3 region.Meanwhile, multilamellar agitator list
Using magnetic shield piece 8, the magnetic field of levels agitator unit is isolated between unit, prevent the superposition of magnetic field intersection region from supporting
Disappear.In the present invention, the agitator unit of agitator system 1 can select between 1-10 layer according to practical situation, every layer of agitator list
Unit's height can be selected in the range of 20～300mm, and the height of molten metal 3 stirring region in crystallizer can be in 0～300mm
Interior regulation.
The present invention pass through above of both adjust, the magnetic stirrer system 1 of achievable crystallizer in the horizontal direction and
The independent regulation of vertical direction, thus can require to modulate different stirring magnetic fields according to the stirring of crystallizer flow field, reaches relatively
Good mixing effect.
The multidimensional magnetic field modulating device of plate slab crystallizer electromagnetic agitation of the present invention can be to the metal of slab caster mould
Liquid carries out the stirring magnetic field modulation of arbitrary patterns, both can achieve molten metal entirety electromagnetic agitation, also separated regions electromagnetic agitation, magnetic
Field control mode is flexible.At present, the single-cycle stir mode of commonly used entirety in continuous casting commercial production, in different continuous casting process
Under the conditions of it is impossible to stirring magnetic field carry out local modulation, this may to produce high-quality strand bring certain mass defect.Adopt
With the modulating device of the present invention, different stir modes flexibly can be selected according to live actual process parameter, thus reaching preferably
Mixing effect, there is preferable application prospect.
These are only presently preferred embodiments of the present invention, be not intended to limit the protection domain of invention, therefore, all this
Any modification, equivalent substitution and improvement made within the spirit of invention and principle etc., should be included in protection scope of the present invention
Within.
Claims (8)
1. a kind of multidimensional magnetic field modulating device of plate slab crystallizer electromagnetic agitation, including crystallizer system（2）And molten metal（3）,
Crystallizer system（2）Including crystallizer width face（10）, leptoprosopy（9）And submersed nozzle（11）, crystallizer system（2）Built with gold
Belong to liquid（3）；It is characterized in that：Described magnetic field modulation device also includes agitator system（1）And velocity-measuring system（4）；
Described agitator system（1）Including PLC control unit and two unilateral agitators, two unilateral agitators are distributed in respectively
Crystallizer system（2）On the wide face of both sides, unilateral agitator includes multilamellar agitator unit, arranges magnetic between two-layer agitator unit
Shielding piece（8）, agitator unit is coated with agitator shell（5）, every layer of agitator unit include multiple coils（6）And yoke
（7）, PLC control unit connection coil（6）Tap, changes coil（6）Winding current size and phase place enable transverse magnetic field and adjust
System；Every layer of agitator unit independent connection PLC control unit, for the regulation of longitudinal magnetic field；
Described velocity-measuring system（4）Including holes probe and intelligent processing unit, holes probe is arranged on crystallizer leptoprosopy（9）On,
Can measure in crystallizer along wide face（10）The molten metal in direction（3）Flow velocity；The rate signal of measurement is sent to intelligence by holes probe
Energy processing unit, exports to agitator system after being processed by intelligent processing unit（1）PLC control unit.
2. the multidimensional magnetic field modulating device of plate slab crystallizer electromagnetic agitation according to claim 1, is characterized in that：Described survey
Speed probe is along crystallizer leptoprosopy（9）Vertical Square set up two rows, the often number of plies of row's holes probe quantity and agitator unit
Identical.
3. the multidimensional magnetic field modulating device of plate slab crystallizer electromagnetic agitation according to claim 2, is characterized in that：Described survey
Speed probe is located at the center of every layer of agitator unit vertical direction, near crystallizer width face（10）Inner side.
4. the multidimensional magnetic field modulating device according to described plate slab crystallizer electromagnetic agitation arbitrary in claims 1 to 3, its feature
It is：Described holes probe is ultrasound wave holes probe.
5. the multidimensional magnetic field modulating device of plate slab crystallizer electromagnetic agitation according to claim 1, is characterized in that：Described
PLC control unit connects coil（6）Tap, selects agitator coil（6）Tap and current phase angle, realize transverse magnetic field direction
On crystallizer inner metal liquid（3）Overall circulation stirring.
6. the multidimensional magnetic field modulating device of plate slab crystallizer electromagnetic agitation according to claim 1, is characterized in that：Described
PLC control unit connects coil（6）Tap, selects agitator coil（6）Tap and current phase angle, realize transverse magnetic field direction
On crystallizer inner metal liquid（3）Left and right subregion is stirred.
7. the multidimensional magnetic field modulating device of plate slab crystallizer electromagnetic agitation according to claim 1, is characterized in that：Described
PLC control unit connects coil（6）Tap, selects agitator coil（6）Tap and current phase angle, realize transverse magnetic field direction
On crystallizer inner metal liquid（3）Left, center, right three regional compartmentalization is stirred.
8. the multidimensional magnetic field modulating device of plate slab crystallizer electromagnetic agitation according to claim 1, is characterized in that：Described
PLC control unit connects coil（6）Tap, selects agitator coil（6）Tap and current phase angle, realize transverse magnetic field direction
On crystallizer inner metal liquid（3）First, second, third, fourth regional compartmentalization stirring.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105935751A (en) * | 2016-07-05 | 2016-09-14 | 湖南中科电气股份有限公司 | Multifunctional multi-mode electromagnetic flow control device of slab continuous casting crystallizer |
| CN108284208B (en) * | 2017-01-09 | 2020-01-31 | 宝山钢铁股份有限公司 | self-adaptive pulling speed change electromagnetic stirring system and stirring method |
| JP6278168B1 (en) * | 2017-04-25 | 2018-02-14 | Ｊｆｅスチール株式会社 | Steel continuous casting method |
| CN113684479A (en) * | 2020-05-19 | 2021-11-23 | 宝山钢铁股份有限公司 | Coating method using electromagnetic stirrer for stirring and alloy vacuum deposition device |
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| JPS6040654A (en) * | 1983-08-12 | 1985-03-04 | Mitsubishi Heavy Ind Ltd | Electromagnetic stirrer in mold |
| CN101316670A (en) * | 2005-11-28 | 2008-12-03 | 罗泰莱克公司 | Adjusting the mode of electromagnetic stirring over the height of a continuous casting mould |
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| US4016926A (en) * | 1974-03-23 | 1977-04-12 | Sumitomo Electric Industries, Ltd. | Electro-magnetic strirrer for continuous casting machine |
| JPS6040654A (en) * | 1983-08-12 | 1985-03-04 | Mitsubishi Heavy Ind Ltd | Electromagnetic stirrer in mold |
| CN101316670A (en) * | 2005-11-28 | 2008-12-03 | 罗泰莱克公司 | Adjusting the mode of electromagnetic stirring over the height of a continuous casting mould |
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