CN205629310U - Circumference base continuous casting meniscus electromagnetic stirring system with magnetic screen and multi -mode - Google Patents
Circumference base continuous casting meniscus electromagnetic stirring system with magnetic screen and multi -mode Download PDFInfo
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- CN205629310U CN205629310U CN201620359853.9U CN201620359853U CN205629310U CN 205629310 U CN205629310 U CN 205629310U CN 201620359853 U CN201620359853 U CN 201620359853U CN 205629310 U CN205629310 U CN 205629310U
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Abstract
The utility model provides a circumference base continuous casting meniscus electromagnetic stirring system with magnetic screen and multi -mode, including meniscus electromagnetic agitator and variable frequency power supply control system, variable frequency power supply control system connect meniscus electromagnetic agitator's the taking a percentage of coil, electromagnetic agitator provides variable frequency power supply for the meniscus, through phase sequence and the phase angle that changes the coil internal current, realize meniscus electromagnetic stirring mode or crystallizer stir mode, meniscus electromagnetic stirring mode, including letting the molten steel form two spermotypes of single circulating -area and single two circulating -areas respectively, the steel grade higher to inside requirements for quality, the selective freezing ware stir mode stir, to surface and the higher steel grade of subcutaneous requirements for quality, select the stirring of meniscus electromagnetic stirring mode. It does not have the restriction of installation space and mounted position to enable the agitator, effectively solves casting blank surface quality problem, can both gain better metallurgical effect to arbitrary section and steel grade.
Description
Technical field
This utility model belongs to a motlten metal and casts (continuous casting) electricity consumption magnetic control Flow Technique continuously, relates to one and has magnetic shield and multimodal square-round billet continuous casting meniscus electromagnetic stirring system.This utility model is also applied for the M-EMS of routine.
Background technology
Continuous casting practice have shown that, molten steel in mold flow profile not only affects casting billet surface and the floating of the gentle bubble of inner clamps foreign material, removal, and (the abbreviation scope of freedom) behavior of slag free surface in crystallizer and initial solidification shell upgrowth situation can be produced impact.Due to the complexity of scope of freedom behavior and difficulty to control in crystallizer, MOLTEN STEEL FLOW at the scope of freedom is made to control the emphasis for molten steel in mold flowing control and difficult point.On the one hand the molten steel near the scope of freedom to keep certain flowing velocity; so be conducive to strengthening the lubrication of molten mold flux and absorbing bubble and the ability of field trash; also can reduce molten steel overheat, slow down the setting rate of molten steel in mold, thus improve the surface of strand and subcutaneous quality；On the other hand near the scope of freedom, MOLTEN STEEL FLOW again can not be too fast, to avoid causing meniscus deformation and scope of freedom fluctuation to destroy lubrication of crystallizer, covering slag volume suction and the erosion at the mouth of a river, causes surface and surface defect.In existing crystallizer electromagnetism flow control technology, representative having in sheet billet continuous casting: M-EMS technology based on travelling-magnetic-field；Mould electromagnetic brake technology based on direct current, and the multi-mode M-EMS technology based on travelling-magnetic-field.And in square-round billet continuous casting, substantially only have the M-EMS technology of rotating excitation field.
But it is not enough to there is some in existing M-EMS technology on metallurgical effect: 1, installing space requires.The installation site of existing electromagnetic agitation typically requires distance crystallizer meniscus 250～400mm, not only stirs the molten steel at meniscus but also do not cause meniscus deformation and the metallurgical effect of scope of freedom fluctuation to meet.2, the surface quality improving strand is limited.Though existing M-ems can obtain preferable metallurgical effect for major part steel grade and section, but for the higher variety steel of surface quality requirements, due to its installation site on the lower, limited to the cleaning of non-metallic inclusion and the control of initial solidification green shell.3, the metallurgical effect of big cross section circumference base is limited.A pair pole rotating excitation field design of the many employings of M-ems, section is the biggest, and magnetic field is decayed the most serious in air gap, and the effectively active force of stirring molten steel is the least.4, it is easily caused the bigger square billet of length-width ratio and produces corner crack.Owing to M-EMS uses a pair pole design of rotating excitation field, flowing in square blank crystallizer is at middle part, rotate around center, the flow field formed is a circle, so presenting circinate secondary back in four corners, field trash, once enter wherein, cannot be removed, and forms corner slag inclusion, and serious causes corner crack or bleed-out.
Therefore, it is necessary to design a kind of restriction being fitted without space, slab quality can be improved, electromagnetic stirring system that the suitability is wide and method.
Utility model content
This utility model is solved the technical problem that to be, for shortcoming and problem present in background technology, the square-round billet continuous casting meniscus electromagnetic stirring system of a kind of band magnetic shield and multiple flow control pattern is provided, this is around as the term suggests being arranged on by magnetic stirrer at crystallizer meniscus and molten steel being implemented multimodal electromagnetic agitation, both existing function had been contained, agitator can be made again to be fitted without the restriction of space and installation site simultaneously, casting billet surface and subcutaneous quality problems can be efficiently solved, arbitrary cross-section and steel grade can be obtained preferable metallurgical effect.
In order to realize above-mentioned technical purpose, this utility model adopts the following technical scheme that
One has magnetic shield and multimodal square-round billet continuous casting meniscus electromagnetic stirring system, including meniscus magnetic stirrer 15 and variable-frequency power sources control system 16；
Meniscus magnetic stirrer is arranged near the meniscus of crystallizer 17；
The version of described crystallizer 17 generally uses tubular type or combination type, and it uses high heat conductance (λ ＞ 397W/ (m DEG C)), the copper material of low conductivity (σ ＜ 49000000S/m) to make.No matter which kind of version can facilitate meniscus magnetic stirrer to be arranged near meniscus, meets molten steel in mold the least from distance L of agitator 15 inner housing 8；
Described meniscus magnetic stirrer 15 includes iron core 7, many group coils 4, shell body 5 and inner housing 8；Many group coils 4 are uniformly wound on iron core 7, and iron core 7 and many group coils 4 are arranged in the closed housing body being made up of shell body and inner housing 8；The shape closing housing is mated with iron core 7；
Described variable-frequency power sources control system 16 is containing two functions, and one is to realize the regulation and control to meniscus magnetic stirrer 15；Two is the position (seeing below described) of the molten steel in mold liquid level 13 of display detection in real time.
The tap of the coil 4 of described variable-frequency power sources control system 16 connecting bending lunar surface magnetic stirrer 15, provides three-phase or biphase variable-frequency power sources for meniscus magnetic stirrer 15；By the size of electric current, frequency and phase place in change coil 4, it is achieved the regulation and control to meniscus magnetic stirrer 15；
The field regions size of described meniscus magnetic stirrer 15 and magnetic direction all can be individually by variable-frequency power sources control system 16 real-time monitorings；
By changing phase sequence and the phase angle of electric current in coil 4, realize two class mode of electromagnetic stirring: meniscus mode of electromagnetic stirring and conventional M-EMS pattern, the former is used for the strand that surface quality requirements is higher, and the latter requires higher strand for internal soundness；
Described meniscus mode of electromagnetic stirring includes many spermotypes, and molten steel can be allowed to form single circulating-area and multiple circulating-areas etc.；
In meniscus mode of electromagnetic stirring, allow molten steel form coil 4 corresponding to the subpattern of single circulating-area arrange and power supply mode is: coil 4 includes 4 groups of coils that symmetry is wound on iron core 7, needing 4n (n >=1) to organize coil altogether, n is the adjacent windings number that each group of coil includes；As a example by n=3, the most each group includes that adjacent three coil, 12 coils, according to the arrangement position on iron core 7, are respectively designated as coil a, b, c, d, e, f, g, h, i, j, k, l the most successively；By adjusting variable-frequency power sources control system 16 or the mode of connection, coil a, b, c and coil g, h, i are passed to three phase mains U, V, W respectively；Coil d, e, f and coil j, k, l pass to three phase mains-U ,-V ,-W respectively；
In meniscus mode of electromagnetic stirring, allow molten steel form coil 4 corresponding to the subpattern of single two circulating-areas arrange and power supply mode is: coil 4 includes 6 groups of coils that symmetry is wound on iron core 7, needing 6n (n >=1) to organize coil altogether, n is the adjacent windings number that each group of coil includes；As a example by n=3, the most each group includes that adjacent three coil, 18 coils, according to the arrangement position on iron core 7, are respectively designated as coil a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, s the most successively；By adjusting variable-frequency power sources control system 16 or the mode of connection, coil d, e, f, coil l, k, j are passed to three phase mains U, V, W respectively with coil p, q, s；Coil a, b, c, coil i, h, g and coil o, n, m pass to three phase mains-U ,-V ,-W respectively；
Described meniscus mode of electromagnetic stirring uses the pattern of multipair magnetic pole 11, its Magnetic Field Design feature is: magnetic circuit is short, and the magnetic line of force 12 does not penetrates through strand, is concentrated mainly near solidification front, so the electromagnetic force produced is not passed through strand center, mainly act on casting blank solidification forward position.Magnetic field run 10 times, electromagnetic force can be made to be concentrated mainly near solidification front so that it is in molten steel make rotational flow, its flow pattern: make molten steel in mold 2 form multiple little circulation region, near solidification front, flow velocity is fast, and the most slack-off to center, center is zero.Flow location form 9 is a rectangle circulation being formed of a square billet or rectangular bloom electromagnetic agitation or multiple rectangle circulation.
In described conventional M-EMS pattern, coil 4 is arranged and power supply mode is: coil 4 includes 4 groups of coils that symmetry is wound on iron core 7, needs 4n (n >=1) to organize coil altogether, and n is the adjacent windings number that each group of coil includes；As a example by n=3, the most each group includes that adjacent three coil, 12 coils, according to the arrangement position on iron core 7, are respectively designated as coil a, b, c, d, e, f, g, h, i, j, k, l the most successively；By adjusting variable-frequency power sources control system 16 or the mode of connection, coil a, b, c and coil d, e, f are passed to three phase mains U, V, W respectively；Coil g, h, i and coil j, k, l pass to three phase mains-U ,-V ,-W respectively.
In described conventional crystallizer stir mode, magnetic field is a pair magnetic pole 11, and it is internal that the magnetic line of force 12 penetrates molten steel 2.Run 10 times in magnetic field so that it is the electromagnetic force excited produces rotational flow inside molten steel 2.Flow location form 9 is a similar round (square billet, circle base are all similar round flow field).
In continuous casting production process, according to different steel grade metallurgical effect needs, by adjusting the stir mode required for variable-frequency power sources control system 16 or mode of connection selection.If Inner Quality of Billet requires higher steel grade, such as, require to improve equiax crystal, minimizing center segregation, loosen, can be with selective freezing device stir mode.If the steel grade the highest to casting billet surface and subcutaneous prescription, strand non-metallic inclusion to be reduced, reduce casting billet surface pin hole quantity and casting billet surface longitudinal crackle and can pay the utmost attention to meniscus mode of electromagnetic stirring: the such as strand to less than 300 cubic metres, the general meniscus mode of electromagnetic stirring using single stirring area, to more than 300 cubic metres strands, the general meniscus mode of electromagnetic stirring using many stirring area.It is emphasized that for square billet or rectangular bloom, it is recommended to use meniscus mode of electromagnetic stirring, because square billet, rectangular bloom use four corners of crystallizer stir mode strand to present circinate secondary back, easily form corner slag inclusion.And meniscus mode of electromagnetic stirring possesses crystallizer stirring to a certain extent and improves equiax crystal, reduces center segregation, the function of loose problem, it is also possible to increase substantially casting billet surface and subcutaneous quality.After choosing stir mode, optimal flow field can be formed by adjusting the parameters such as variable-frequency power sources control system 16 electric current, frequency, reach optimal metallurgical effect, meet the demand that difference produces.
Described have magnetic shield and multimodal square-round billet continuous casting meniscus electromagnetic stirring system, also include the crystallizer electromagnetic liquid surface detection system of independent research, can detect and show the physical location of liquid steel level (13) in real time, this system includes sensor 14, front end amplifying device and data processing unit；Sensor 14 is arranged on the inner side of copper plate of crystallizer 1, can detect the position of molten steel in mold liquid level 13 in real time；Sensor by measurement to liquid level position signal be sent to front end amplifying device, signal is amplified, is sent to data processing unit, then exports to variable-frequency power sources control system 16.
Described sensor 14 is arranged on any side in crystallizer 17, and is positioned at this side copper plate center layout in parallel, and the front end of sensor is parallel with the facade of copper plate of crystallizer.So that sensor can detect wave height and the position of Mold in real time.
Described sensor 14 is electromagnetic sensor or eddy-current transducer；Its type of cooling is water-cooled；
Described sensor 14 can carry or without cable.
Described crystallizer electromagnetic liquid surface detection system is the prerequisite of stable meniscus, is also the essential condition of meniscus electromagnetic agitation.Liquid level is higher easily causes meniscus deformation and scope of freedom fluctuation when meniscus magnetic stirrer runs；Liquid level is on the low side affects the using effect of meniscus magnetic stirrer.Detected in real time by crystallizer electromagnetic liquid surface detection system and show the physical location of liquid steel level 13；Liquid steel level 13 is regulated and controled by variable-frequency power sources control system 16 according to testing result, prevents liquid level fluctuation of molten steel from causing slag.
Described meniscus magnetic stirrer 15 includes two kinds of versions, i.e. loop type meniscus magnetic stirrer and salient pole type meniscus magnetic stirrer, and its difference is that iron core 7 structure is different with the installation form of coil 4, and the magnetic field configuration formed is the same.
The iron core 7 of described loop type meniscus magnetic stirrer should match with stirring strand or mold structure form, multiple square, polygon, circular electrical steel sheets not setting teeth groove build up；Coil 4 uses Gramer's winding configuration to be wound on iron core；The meniscus magnetic stirrer 15 of this structure is it is generally required to install magnetic shielding cover 6 additional in its periphery, with the magnetic field excited outside shielded coil (4).
The iron core 7 of described salient pole shape meniscus magnetic stirrer, according to stirring strand or the difference of mold structure form, has square, polygon or circle etc..It is built up by the electrical steel sheet of multiple band salient poles；Coil 4 uses Gramer's winding configuration or centralized winding configuration to be wound on iron core.For using the salient pole shape meniscus magnetic stirrer 15 of Gramer's winding configuration it is generally required to add magnetic shielding cover 6 in its periphery, and the salient pole shape meniscus magnetic stirrer 15 of centralized winding configuration is used typically to need not add magnetic shielding cover 6.
Described magnetic shielding cover 6, it it is a concave shape opening cover being made up of high conductivity (conductivityσ ＞ 58000000S/m) copper plate, being placed between described coil 4 and iron core or outside coil 4, its open side is to described copper plate of crystallizer 1, referring to Fig. 2.
Described coil 4, is formed by flat type copper wire or hollow copper pipe line coiling.
Described closing housing is cavity structure, is inside connected with recirculated cooling water, for cooling down the iron core in cavity and coil in real time；
Described have magnetic shield and multimodal square-round billet continuous casting meniscus electromagnetic stirring system, also includes and closes the cooling water system that housing is connected, providing recirculated cooling water for meniscus magnetic stirrer.
Beneficial effect:
This utility model has manufactured experimently a set of band magnetic shield being applicable to square-round billet continuous casting and multimodal square-round billet continuous casting meniscus electromagnetic stirring system and method by changing the magnetic Circuit Design of meniscus magnetic stirrer 15, the crystallizer electromagnetic liquid surface detection system being previously mentioned and variable-frequency power sources control system 16.Compared with current M-EMS, this system had both remained original M-EMS function, achieved again meniscus electromagnetic agitation function simultaneously, and agitating function is greatly enhanced.Different stir modes can be selected flexibly according to different casting blank section size, achieve the metallurgical effect more excellent than single M-EMS pattern, continuous casting for the bigger strand of many sections steel grade, especially bloom and length-width ratio provides new electromagnetic agitation mode.Square-round billet continuous casting meniscus electromagnetic stirring system becomes the developing direction of square-round billet continuous casting electromagnetic agitation.
Described meniscus mode of electromagnetic stirring, it it is the once change of electromagnetic agitating technology, in conventional magnetic stirrer design, it is all to be the structure that the magnetic line of force penetrates whole strand by Magnetic Field Design, and meniscus electromagnetic agitation is the structure using short magnetic circuit, the magnetic line of force runs near casting billet surface, works casting billet surface, and then drives molten steel to rotate.Such magnetic signature, it is particularly well-suited to bloom and the bigger strand of length-width ratio, stir, there is not stirring dead band, it also avoid tradition M-EMS and easily cause meniscus deformation and the problem of scope of freedom fluctuation, the most there is not the problem that the big circumference base magnetic line of force wears impermeable strand and the electromagnetic push that causes is inadequate.Showing at thread test, meniscus mode of electromagnetic stirring can be greatly reduced casting billet surface and subcutaneous non-metallic inclusion, minimizing casting billet surface pin hole quantity and casting billet surface longitudinal crackle；To expand equiaxial crystal ratio, improve solidified inside tissue, alleviate segregation, loosen also have certain effect.So meniscus mode of electromagnetic stirring is highly profitable to improving slab quality, it is especially suitable for the special steel grade that Surface Quality is higher.
This utility model also includes crystallizer electromagnetic liquid surface detection system.Because liquid level is higher easily causes meniscus deformation and scope of freedom fluctuation when meniscus magnetic stirrer runs；Liquid level is on the low side affects the using effect of meniscus magnetic stirrer.This utility model passes through level detection and regulation and control, prevents liquid level fluctuation of molten steel from causing slag；By the crystallizer electromagnetic liquid surface detection system of independent research, stable meniscus, it is ensured that the using effect of meniscus magnetic stirrer.
Accompanying drawing explanation
Fig. 1 is that square-round billet continuous casting meniscus electromagnetic stirring system of the present utility model is always schemed
Fig. 2 is loop type core structure and the scheme of installation of square-round billet continuous casting meniscus electromagnetic stirring system of the present utility model
Fig. 3 is the top view of Fig. 2
Fig. 4 is the version of salient pole iron core Gramer's winding of square-round billet continuous casting meniscus electromagnetic stirring system of the present utility model
Fig. 5 is the version of the salient pole iron core gram concentratred winding of square-round billet continuous casting meniscus electromagnetic stirring system of the present utility model
Fig. 6 is the B-B view of Fig. 5
Fig. 7 is the magnetic field operation logic figure forming single circulating-area under meniscus mode of electromagnetic stirring
Fig. 8 is to run corresponding molten steel circulation district and three-phase windings sketch with magnetic field in Fig. 7
Fig. 9 is magnetic field operation logic figure corresponding with forming 2 little molten steel circulation districts under meniscus mode of electromagnetic stirring
Figure 10 is that in Fig. 9, corresponding molten steel circulation district and three-phase windings sketch are run in magnetic field
Figure 11 is the magnetic field operation logic figure under M-EMS pattern
Figure 12 is that in Figure 11, corresponding molten steel circulation district and three-phase windings sketch are run in magnetic field
Description of reference numerals:
1, copper plate of crystallizer, 2, molten steel, 3, submersed nozzle, 4, coil, 5, shell body, 6, magnetic shielding cover, 7, iron core, 8, inner housing, 9, MOLTEN STEEL FLOW direction, 10, Movement in Magnetic Field direction, 11, multipair magnetic pole, 12, the magnetic line of force, 13, liquid steel level, 14, sensor, 15, meniscus magnetic stirrer, 16, variable-frequency power sources control system, 17, crystallizer, 18, front-end amplifier and data processor.
Detailed description of the invention
Detailed description of the invention of the present utility model is described in detail by the accompanying drawing below in conjunction with embodiment:
It is that this utility model has magnetic shield and multimodal square-round billet continuous casting meniscus electromagnetic stirring system is always schemed shown in Fig. 1；Fig. 2 is loop type core structure of the present utility model and scheme of installation；Fig. 3 is the top view of Fig. 2；
As it can be seen, this utility model provides one has magnetic shield and multimodal square-round billet continuous casting meniscus electromagnetic stirring system, including meniscus magnetic stirrer 15, variable-frequency power sources control system 16 and crystallizer electromagnetic liquid surface detection system；
Meniscus magnetic stirrer is arranged near the meniscus of crystallizer 17；
The version of described crystallizer 17 generally uses tubular type or combination type, and it uses high heat conductance (λ ＞ 397W/ (m DEG C)), the copper material of low conductivity (σ ＜ 49000000S/m) to make.No matter which kind of version can facilitate meniscus magnetic stirrer to be arranged near meniscus, meets molten steel in mold the least from distance L of agitator 15 inner housing 8；
Described meniscus magnetic stirrer 15 includes iron core 7, many group coils 4, shell body 5 and inner housing 8；Many group coils 4 are uniformly wound on iron core 7, and iron core 7 and many group coils 4 are arranged in the closed housing body being made up of shell body and inner housing 8；The shape closing housing is mated with iron core 7, and Fig. 2 is shown in by its schematic diagram；
Described variable-frequency power sources control system 16 is containing two functions, and one is to realize the regulation and control to meniscus magnetic stirrer 15；Two is the position (seeing below described) of the molten steel in mold liquid level 13 of display detection in real time.
The tap of the coil 4 of described variable-frequency power sources control system 16 connecting bending lunar surface magnetic stirrer 15, provides three-phase or biphase variable-frequency power sources for meniscus magnetic stirrer 15；By the size of electric current, frequency and phase place in change coil 4, it is achieved the regulation and control to meniscus magnetic stirrer 15；
The field regions size of described meniscus magnetic stirrer 15 and magnetic direction all can be individually by variable-frequency power sources control system 16 real-time monitorings；
By changing phase sequence and the phase angle of electric current in coil 4, it is achieved two class mode of electromagnetic stirring: meniscus mode of electromagnetic stirring and conventional M-EMS pattern；
Described meniscus mode of electromagnetic stirring includes many spermotypes, and molten steel can be allowed to form single circulating-area and multiple circulating-areas etc.；
In meniscus mode of electromagnetic stirring, allow molten steel form coil 4 corresponding to the subpattern of single circulating-area arrange and power supply mode is: coil 4 includes 4 groups of coils that symmetry is wound on iron core 7, each group includes adjacent three coil, 12 coils, according to the arrangement position on iron core 7, are respectively designated as coil a, b, c, d, e, f, g, h, i, j, k, l the most successively；By adjusting variable-frequency power sources control system 16 or the mode of connection, coil a, b, c and coil g, h, i are passed to three phase mains U, V, W respectively；Coil d, e, f and coil j, k, l pass to three phase mains-U ,-V ,-W respectively；Fig. 7 is the magnetic field operation logic figure under this pattern, and Fig. 8 is that in Fig. 7, corresponding molten steel motion and three-phase windings sketch are run in magnetic field；
In meniscus mode of electromagnetic stirring, allow molten steel form coil 4 corresponding to the subpattern of single two circulating-areas arrange and power supply mode is: coil 4 includes 6 groups of coils that symmetry is wound on iron core 7, each group includes adjacent three coil, 17 coils, according to the arrangement position on iron core 7, are respectively designated as coil a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, s the most successively；By adjusting variable-frequency power sources control system 16 or the mode of connection, coil d, e, f, coil l, k, j are passed to three phase mains U, V, W respectively with coil p, q, s；Coil a, b, c, coil i, h, g and coil o, n, m pass to three phase mains-U ,-V ,-W respectively；Fig. 9 is the magnetic field operation logic figure under this pattern, and Figure 10 is that in Fig. 9, corresponding molten steel motion and three-phase windings sketch are run in magnetic field；
Described meniscus mode of electromagnetic stirring uses the pattern of multipair magnetic pole 11, its Magnetic Field Design feature is: magnetic circuit is short, and the magnetic line of force 12 does not penetrates through strand, is concentrated mainly near solidification front, so the electromagnetic force produced is not passed through strand center, mainly act on casting blank solidification forward position.Magnetic field run 10 times, electromagnetic force can be made to be concentrated mainly near solidification front so that it is in molten steel make rotational flow, its flow pattern: make molten steel in mold 2 form multiple little circulation region, near solidification front, flow velocity is fast, and the most slack-off to center, center is zero.MOLTEN STEEL FLOW direction 9 is a rectangle circulation being formed of a square billet or rectangular bloom electromagnetic agitation or multiple rectangle circulation.Figure 11 is the magnetic field operation logic figure under this pattern；Figure 12 is that in Figure 11, corresponding molten steel motion and three-phase windings sketch are run in magnetic field.
In described conventional M-EMS pattern, coil 4 is arranged and power supply mode is: coil 4 includes 4 groups of coils that symmetry is wound on iron core 7, each group includes adjacent three coil, 12 coils, according to the arrangement position on iron core 7, are respectively designated as coil a, b, c, d, e, f, g, h, i, j, k, l the most successively；By adjusting variable-frequency power sources control system 16 or the mode of connection, coil a, b, c and coil d, e, f are passed to three phase mains U, V, W respectively；Coil g, h, i and coil j, k, l pass to three phase mains-U ,-V ,-W respectively.
In described conventional crystallizer stir mode, magnetic field is a pair magnetic pole 11, and it is internal that the magnetic line of force 12 penetrates molten steel 2.Run 10 times in magnetic field so that it is the electromagnetic force excited produces rotational flow inside molten steel 2.Flow location form 9 is a similar round (square billet, circle base are all similar round flow field).
Described have magnetic shield and multimodal square-round billet continuous casting meniscus electromagnetic stirring system, also include the crystallizer electromagnetic liquid surface detection system of independent research, can detect and show the physical location of liquid steel level (13) in real time, this system includes sensor 14, front end amplifying device and data processing unit；Sensor 14 is arranged on the inner side of copper plate of crystallizer 1, can detect the position of molten steel in mold liquid level 13 in real time；Sensor by measurement to liquid level position signal be sent to front end amplifying device, signal is amplified, is sent to data processing unit, then exports to variable-frequency power sources control system 16.
Described sensor 14 is arranged on any side in crystallizer 17, and is positioned at this side copper plate center layout in parallel, and the front end of sensor is parallel with the facade of copper plate of crystallizer.
Described sensor 14 is electromagnetic sensor or eddy-current transducer；Its type of cooling is water-cooled；
Described sensor 14 can carry or without cable.
Described crystallizer electromagnetic liquid surface detection system is the prerequisite of stable meniscus, is also the essential condition of meniscus electromagnetic agitation.Liquid level is higher easily causes meniscus deformation and scope of freedom fluctuation when meniscus magnetic stirrer runs；Liquid level is on the low side affects the using effect of meniscus magnetic stirrer.By level detection and regulation and control, prevent liquid level fluctuation of molten steel from causing slag.
Described meniscus magnetic stirrer 15 includes two kinds of versions, i.e. loop type meniscus magnetic stirrer and salient pole type meniscus magnetic stirrer, and its difference is that iron core 7 structure is different with the installation form of coil 4, and the magnetic field configuration formed is the same.
The iron core 7 of described loop type meniscus magnetic stirrer should match with stirring strand or mold structure form, multiple square, polygon, circular electrical steel sheets not setting teeth groove build up (iron core in Fig. 3)；Coil 4 uses Gramer's winding configuration to be wound on iron core；The meniscus magnetic stirrer 15 of this structure is it is generally required to install magnetic shielding cover 6 additional in its periphery, with the magnetic field excited outside shielded coil 4.
The iron core 7 of described salient pole shape meniscus magnetic stirrer, according to stirring strand or the difference of mold structure form, has square, polygon or circle etc..It is built up by the electrical steel sheet of multiple band salient poles (iron core in Fig. 4, Fig. 5 and Fig. 6)；Coil 4 uses Gramer's winding configuration or centralized winding configuration to be wound on iron core.For using the salient pole shape meniscus magnetic stirrer 15 of Gramer's winding configuration it is generally required to add magnetic shielding cover 6 in its periphery, and the salient pole shape meniscus magnetic stirrer 15 of centralized winding configuration is used typically to need not add magnetic shielding cover 6.
Described magnetic shielding cover 6, is a concave shape opening cover being made up of high conductivity copper plate, is placed between described coil 4 and iron core or outside coil 4, its open side is to described copper plate of crystallizer 1, referring to Fig. 2.
Described coil 4, is formed by flat type copper wire or hollow copper pipe line coiling.
Described closing housing is cavity structure, is inside connected with recirculated cooling water, for cooling down the iron core in cavity and coil in real time；
Described have magnetic shield and multimodal square-round billet continuous casting meniscus electromagnetic stirring system, also includes and closes the cooling water system that housing is connected, providing recirculated cooling water for meniscus magnetic stirrer.
In continuous casting production process, according to different steel grade metallurgical effect needs, by adjusting the stir mode required for variable-frequency power sources control system 16 or mode of connection selection.If Inner Quality of Billet requires higher steel grade, such as, require to improve equiax crystal, minimizing center segregation, loosen, can be with selective freezing device stir mode.If the steel grade the highest to casting billet surface and subcutaneous prescription, strand non-metallic inclusion to be reduced, reduce casting billet surface pin hole quantity and casting billet surface longitudinal crackle and can pay the utmost attention to meniscus mode of electromagnetic stirring: the such as strand to less than 300 cubic metres, the general meniscus mode of electromagnetic stirring (Figure 10) using single stirring area, to more than 300 cubic metres strands, the general meniscus mode of electromagnetic stirring (Figure 12) using many stirring area.It is emphasized that for square billet or rectangular bloom, it is recommended to use meniscus mode of electromagnetic stirring, because square billet, rectangular bloom use four corners of crystallizer stir mode strand to present circinate secondary back, easily form corner slag inclusion.And meniscus mode of electromagnetic stirring possesses crystallizer stirring to a certain extent and improves equiax crystal, reduces center segregation, the function of loose problem, it is also possible to increase substantially casting billet surface and subcutaneous quality.After choosing stir mode, optimal flow field can be formed by adjusting the parameters such as variable-frequency power sources control system 16 electric current, frequency, reach optimal metallurgical effect, meet the demand that difference produces.
Embodiment described in the utility model is only the description carrying out preferred implementation of the present utility model; not this utility model spirit and scope are defined; on the premise of without departing from this utility model design philosophy; various modification that in this area, the technical solution of the utility model is made by engineers and technicians and improvement; protection domain of the present utility model all should be fallen into as used; the technology contents that this utility model is claimed, all records in detail in the claims.
Claims (6)
1. one kind has magnetic shield and multimodal square-round billet continuous casting meniscus electromagnetic stirring system, it is characterised in that include meniscus magnetic stirrer (15) and variable-frequency power sources control system (16)；
Meniscus magnetic stirrer (15) is arranged near the meniscus of crystallizer (17)；
Described meniscus magnetic stirrer (15) includes iron core (7), organizes coil (4), shell body (5) and inner housing (8) more；Organize coil (4) to be uniformly wound on iron core (7), iron core (7) and organize coil (4) more and be arranged in the closed housing body being made up of shell body and inner housing (8) more；The shape closing housing is mated with iron core (7)；
The tap of the coil (4) of described variable-frequency power sources control system (16) connecting bending lunar surface magnetic stirrer (15), provides variable-frequency power sources for meniscus magnetic stirrer (15)；By changing size, frequency and the phase place of coil (4) interior electric current, it is achieved the regulation and control to meniscus magnetic stirrer (15)；
By changing phase sequence and the phase angle of coil (4) interior electric current, it is achieved two class mode of electromagnetic stirring: meniscus mode of electromagnetic stirring and conventional M-EMS pattern；
Described meniscus mode of electromagnetic stirring, forms single circulating-area and two spermotypes of single two circulating-areas including allowing molten steel (2)；
In meniscus mode of electromagnetic stirring, allow molten steel form coil (4) corresponding to the subpattern of single circulating-area arrange and power supply mode is: coil (4) includes 4 groups of coils that symmetry is wound on iron core (7), each group includes adjacent three coil, 12 coils, according to the arrangement position on iron core (7), are respectively designated as coil a, b, c, d, e, f, g, h, i, j, k, l the most successively；Coil a, b, c and coil g, h, i pass to three phase mains U, V, W respectively；Coil d, e, f and coil j, k, l pass to three phase mains-U ,-V ,-W respectively；
In meniscus mode of electromagnetic stirring, allow molten steel form coil (4) corresponding to the subpattern of single two circulating-areas arrange and power supply mode is: coil (4) includes 6 groups of coils that symmetry is wound on iron core (7), each group includes adjacent three coil, 18 coils, according to the arrangement position on iron core (7), are respectively designated as coil a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, s the most successively；Coil d, e, f, coil l, k, j pass to three phase mains U, V, W respectively with coil p, q, s；Coil a, b, c, coil i, h, g and coil o, n, m pass to three phase mains-U ,-V ,-W respectively；
In described conventional M-EMS pattern, coil (4) is arranged and power supply mode is: coil (4) includes 4 groups of coils that symmetry is wound on iron core (7), each group includes adjacent three coil, 12 coils, according to the arrangement position on iron core (7), are respectively designated as coil a, b, c, d, e, f, g, h, i, j, k, l the most successively；Coil a, b, c and coil d, e, f pass to three phase mains U, V, W respectively；Coil g, h, i and coil j, k, l pass to three phase mains-U ,-V ,-W respectively.
The most according to claim 1 have magnetic shield and multimodal square-round billet continuous casting meniscus electromagnetic stirring system, it is characterised in that also includes crystallizer electromagnetic liquid surface detection system；Crystallizer electromagnetic liquid surface detection system includes sensor (14), front end amplifying device and data processing unit；Sensor (14) is arranged on the inner side of copper plate of crystallizer (1)；Sensor by measurement to liquid level position signal be sent to front end amplifying device, signal is amplified, it is sent to data processing unit, then exports to variable-frequency power sources control system (16), with detection in real time and the physical location of display liquid steel level (13)；Liquid steel level (13) is regulated and controled by variable-frequency power sources control system (16) according to testing result, prevents liquid level fluctuation of molten steel from causing slag.
The most according to claim 2 have magnetic shield and multimodal square-round billet continuous casting meniscus electromagnetic stirring system, it is characterized in that, the sensor (14) of described crystallizer electromagnetic liquid surface detection system is arranged on any side in crystallizer (17), and it being positioned at this side copper plate center layout in parallel, the front end of sensor is parallel with the facade of copper plate of crystallizer.
The most according to claim 3 have magnetic shield and multimodal square-round billet continuous casting meniscus electromagnetic stirring system, it is characterised in that the sensor (14) of described crystallizer electromagnetic liquid surface detection system is electromagnetic sensor or eddy-current transducer.
The most according to claim 4 have magnetic shield and multimodal square-round billet continuous casting meniscus electromagnetic stirring system, it is characterized in that, described meniscus magnetic stirrer (15) includes two kinds of versions, i.e. loop type meniscus magnetic stirrer and salient pole type meniscus magnetic stirrer；
The iron core (7) of described loop type meniscus magnetic stirrer is built up by multiple electrical steel sheets not setting teeth groove；Coil (4) uses Gramer's winding configuration to be wound on iron core；
The iron core (7) of described salient pole type meniscus magnetic stirrer is built up by the electrical steel sheet of multiple band salient poles；Coil (4) uses Gramer's winding configuration or centralized winding configuration to be wound on iron core.
The most according to claim 5 have magnetic shield and multimodal square-round billet continuous casting meniscus electromagnetic stirring system, it is characterized in that, the meniscus magnetic stirrer (15) being wound on iron core for coil (4) employing Gramer's winding configuration, also adds magnetic shielding cover (6)；The concave shape opening cover that described magnetic shielding cover (6) is made up of the copper plate of conductivityσ ＞ 58000000S/m, being placed between described coil (4) and iron core or coil (4) is peripheral, its open side is to described copper plate of crystallizer (1).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107421328A (en) * | 2017-06-13 | 2017-12-01 | 石家庄爱迪尔电气有限公司 | Heating seethes rabble furnace with stirring interlock type electromagnetism |
| CN112292222A (en) * | 2018-06-28 | 2021-01-29 | 达涅利机械设备股份公司 | Apparatus and method for controlling continuous casting using electromagnetic brake |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107421328A (en) * | 2017-06-13 | 2017-12-01 | 石家庄爱迪尔电气有限公司 | Heating seethes rabble furnace with stirring interlock type electromagnetism |
| CN112292222A (en) * | 2018-06-28 | 2021-01-29 | 达涅利机械设备股份公司 | Apparatus and method for controlling continuous casting using electromagnetic brake |
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