CN203621423U - Electromagnetism braking device for centralizing magnetic area in continuous casting crystallizer - Google Patents
Electromagnetism braking device for centralizing magnetic area in continuous casting crystallizer Download PDFInfo
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- CN203621423U CN203621423U CN201320865583.5U CN201320865583U CN203621423U CN 203621423 U CN203621423 U CN 203621423U CN 201320865583 U CN201320865583 U CN 201320865583U CN 203621423 U CN203621423 U CN 203621423U
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Abstract
The utility model belongs to the area of continuous casting, and relates to an electromagnetism braking device for centralizing a magnetic area in a continuous casting crystallizer. The electromagnetism braking device comprises a ferromagnetic core, a coil, a magnet yoke, a steady power supply and a magnetic pole. The electromagnetism braking device is characterized in that a thin incrassate magnetic pole component in the height direction is added in an extension part of the ferromagnetic core, the height of the magnetic pole is more than the height of the ferromagnetic core, and the new added magnetic pole can centralize the distribution of the magnetic area intensity in the crystallizer. Under the condition that current parameters are totally the same, the magnetic induction intensity in the crystallizer improves 30%-50% in an electromagnetic brake installation height range. In the height range, the weak degree of the magnetic intensity is small, the magnetic induction intensity in the crystallizer is distributed in a relatively centralized mode, an equivalent magnetic area intensity area is formed, compared with a traditional electromagnetism braking device, the electromagnetism braking device has an obvious current control effect of liquid steel on the crystallizer.
Description
Technical field
The utility model belongs to continuous casting field, relates to the continuous casting electromagnetic braking equipment making in crystallizer internal magnetic field set of regions.
Background technology
Electromagnetic technique is one and relates to electromagnetic dynamics, thermodynamics and the hydromechanical comprehensive branch of learning.In recent years, because electromagnetic technique can effectively improve the quality of strand, met the requirement of cleanliness under high pulling rate, thereby paid close attention to widely.The application of electromagnetic technique in casting process mainly contains electromagnetic agitation (Electromagnetic Stirring, be called for short EMS), soft contact (Soft Contact), electromagnetic braking (Electromagnetic Brake, be called for short EMBR), and NKK in the time of low pulling rate electromagnetism liquid level accelerator (EMLA) used and in the time of high pulling rate electromagnetism liquid level stabilizer (EMLS) used.
The basic principle of electromagnetic brake technology is near wide submersed nozzle region of crystallizer, to arrange with mouth of a river molten steel to flow out the vertical constant magnetic field of direction, in the time of liquid metal cutting magnetic line movement, according to Ohm's law, in liquid metal, can produce induced-current, and the reciprocation of induced-current and constant magnetic field can produce and the Lorentz force of molten steel flow opposite direction, thereby suppress flowing of molten steel.From eighties of last century eighties, electromagnetic brake technology has experienced first generation domain type electromagnetic brake technology, second generation single bar-type electromagnetic brake technology and until flow control technique in the third generation crystallizer of today.
(1) domain type electromagnetic braking
At the beginning of 1980, the ABB of Sweden and Kawasaki, Japan iron company have developed jointly first generation domain type Eletro magnetic actuator EMBR.Although can alleviating, this electromagnetic braking even eliminates molten steel stream burst washing away crystallizer leptoprosopy base shell; also suppress the molten steel fluctuation of meniscus in crystallizer simultaneously; thereby greatly reduce covering slag and be involved in molten steel and casting billet surface and produce the probability of defect; but because the sphere of action in magnetic field is very limited; also there is following problem in domain type electromagnetic brake technology: flows the floating of thigh; a little less than braking effect, the generation of raceway groove.
(2) single bar-type electromagnetic braking
1991, the Sollac company of France and Dutch Hoogovens company tested, and original limited domain type magnetic field are expanded to the horizontal magnetic field of the whole width of slab, have developed second generation single bar-type electro-magnetic braking device EMBR Ruler.Be applied to the impact that horizontal magnetic field on the whole width of continuous casting crystallizer for plate billet has suppressed the molten steel that flows out from the submersed nozzle solidified shell to the narrow limit of strand, shorten the impact depth time backflowing, below the mouth of a river, form uniform piston flow, simultaneously, backflow and be also well controlled, obtained good metallurgical effect.
But second generation electro-magnetic braking device is subject to the impact of installation site larger, will have influence on braking effect if the distance at magnetic field position and mouth of a river angle slightly far away or that the mouth of a river goes out to flow is slightly improper.Even there will be backflow under only having controlled, and affect meniscus disturbance on backflow and can not get effective control.
(3) flow control mold
After second generation electro-magnetic braking device, Kawasaki, Japan company has developed again third generation electro-magnetic braking device-flow control mold (Flow Control Mold) subsequently.With respect to second generation electro-magnetic braking device, the electro-magnetic braking device of the third generation is the horizontal magnetic field that has applied again a whole width of covering at crystallizer meniscus place, can reduce like this molten steel fluctuation at meniscus place and the molten steel flow velocity of crystallizer bottom simultaneously, thereby complete the comprehensive control to crystallizer interior flow field, due to cost and to the technological operation reason such as have relatively high expectations, so it is also fewer to apply at present the iron and steel enterprise of this electro-magnetic braking device.
At present, the second generation of iron and steel enterprise's application both at home and abroad single bar-type electro-magnetic braking device is the most extensive, and this device is arranged on crystallizer region, in the corresponding electro-magnetic braking device center cross-sectional of maximum magnetic induction producing in crystallizer.In crystallizer short transverse, magnetic induction intensity reduces gradually after away from electromagnetic braking center cross-sectional, for the electromagnetic braking of DC coil, due to copper plate of crystallizer and molten steel less to influence of magnetic field, while changing the setting height(from bottom) of electro-magnetic braking device, only there is translation in crystallizer intrinsic inductance, and the intensity of its distribution characteristics and electromagnetic induction is not affected substantially in short transverse.
For continuous casting billet, the flow velocity that impacts molten steel stream thigh in crystallizer is larger, can impact to crystallizer leptoprosopy and form upper convolution district, cause near the molten steel of meniscus in crystallizer to fluctuate violent, this is also the main cause of slag in crystallizer, adopt after electromagnetic braking, electro-magnetic braking device is installed below submersed nozzle, the Lorentz force with the moving opposite direction of stream plume producing can effectively suppress molten steel flow velocity, reduce Mold liquid fluctuating, improve Mold temperature distribution evenness.But, the single bar-type electro-magnetic braking device generally using at present, the electromagnetic field producing in crystallizer is maximum in electromagnetic braking center cross-sectional, after this cross section, magnetic field intensity decay is very fast, be difficult to give full play to the effect of electro-magnetic braking device, in order to guarantee electromagnetic braking effect, hope forms the larger horizontal magnetic field region having within the scope of certain altitude near can be below mold gap.Obviously, also there are some defects in the second generation single bar-type electro-magnetic braking device that steel mill generally adopts, such as, the magnetic field that electro-magnetic braking device produces in crystallizer distributes and does not concentrate in short transverse, most of regional magnetic field undercapacity, can not give full play to the flow control effect of electro-magnetic braking device.
Summary of the invention
The utility model is to exist the magnetic field that electro-magnetic braking device produces in crystallizer in short transverse, to distribute unconcentrated in order to overcome, most of regional magnetic field undercapacity, can not give full play to the defect of the flow control effect of electro-magnetic braking device, for electricity-magnetic salient feature of continuous cast mold feature and electro-magnetic braking device, improve and designed a kind of concentrated electro-magnetic braking device of field region that makes, this equipment is being saved electric energy, under the prerequisite reducing costs, for continuous casting technique, can more effectively suppress Mold stream strand impacts, the interior molten steel liquid fluctuating of crystallization control device also prevents slag phenomenon, improve slab quality, this electro-magnetic braking device is simple to operate, can on the basis of single bar-type electro-magnetic braking device, improve comparatively easily, can be conveniently used in steel mill's actual production.
A kind of electro-magnetic braking device making in continuous cast mold internal magnetic field set of regions, it is characterized in that: this device is made up of ferromagnetic core, yoke, coil, permanent voltage-stabilizing power supply and magnetic pole, ferromagnetic core closely connects yoke and magnetic pole, winding around on ferromagnetic core, magnet yoke ring is around crystallizer, and pole design is rectangle, and magnetic pole height is greater than ferromagnetic core height, height increase scope is 50mm ~ 200mm, and magnetic pole transverse width and ferromagnetic core are consistent.
The setting height(from bottom) of this electro-magnetic braking device determines by mouth of a river shape, crystallizer width, pulling rate, and setting height(from bottom) is 150mm ~ 400mm apart from the distance of meniscus (being liquid steel level) in crystallizer, and electromagnetic braking upper surface is positioned near submersed nozzle outlet.
The utility model core is to increase a thinner pole piece at ferromagnetic core extension, and this magnetic pole height is H1, is greater than the height H 2 of ferromagnetic core, and newly-increased magnetic pole is the core component that can make in crystallizer internal magnetic field set of regions.
For sheet billet continuous casting technique, the utility model, compared with existing technology, has obvious advantage and effect.The utility model is in the identical situation of current parameters, crystallizer intrinsic inductance improves 30%-50% within the scope of electromagnetic braking setting height(from bottom) H1, and in this altitude range, the weak degree of electromagnetism intensity is less, present an equivalent magnetic field strength region, therefore, can more effectively suppress the impact velocity of stream thigh.Based on above-mentioned reason, after the single bar-type electro-magnetic braking device generally using for current steel mill is transformed according to this patent, under same electromagnetic braking effect prerequisite, needed electric energy will reduce 30%-50%, significantly save the energy and production cost, under same electromagnetic parameter, electromagnetic braking effect of the present utility model is more obvious.
Accompanying drawing explanation
The profile at Fig. 1 mould electromagnetic brake device Yan Kuanmian center;
The A-A of Fig. 2 Fig. 1 cuts open to figure;
In Fig. 1,2: 1-crystallizer submersed nozzle, 2-meniscus, 3-submersed nozzle flow export, 4-coil, 5-yoke, 6-ferromagnetic core, 7-magnetic pole, 8-copper plate of crystallizer, a-magnetic pole thickness, H1-magnetic pole height, H2-yoke and ferromagnetic core height, W1 yoke width, W2-ferromagnetic core width.
The specific embodiment
As shown in Figure 1, the profile at mould electromagnetic brake device Yan Kuanmian center, the electro-magnetic braking device of installing around crystallizer is made up of ferromagnetic core, coil, yoke and magnetic pole.Ferromagnetic core and yoke height are identical, be wound around electromagnetic induction coil and be connected with the steady current source of perseverance at ferromagnetic core place, and the magnetic pole stretching out is closely connected with ferromagnetic core, and the outer surface that magnetic pole and crystallizer are wide exists air gap, and its thickness is generally 2 ~ 5mm.Fig. 2 is that the A-A of Fig. 1 cuts open to figure, and as can be seen from Figure 2, ferromagnetic core, yoke, magnetic pole are basically identical with crystallizer width on width.The utility model is particularly applicable for high casting speed continuous casting technique.
Application the utility model, concrete example is as follows.According to Fig. 1, Fig. 2, electro-magnetic braking device is installed, coil is passed into DC current, its casting condition is as follows:
Casting blank specification: width 1500mm × thickness 220mm
Casting speed: 1m/min
Immerge depth of mould nozzle: 260mm
Current parameters used: 10000An
Ferromagnetic core height: 200mm
Magnetic pole height: 300mm
Apply after this scheme, in plate slab crystallizer, compared with traditional electro-magnetic braking device is installed, electro-magnetic braking device installation region is within the scope of short transverse 300mm, the magnetic field producing is uniformly distributed, and because the utility model electro-magnetic braking device makes magnetic field intensity more concentrated, its maximum magnetic induction will improve 40% left and right, therefore, can effectively improve the electromagnetic braking effect of molten steel in mold and meniscus.
Claims (2)
1. one kind makes the electro-magnetic braking device in continuous cast mold internal magnetic field set of regions, it is characterized in that: this device is made up of ferromagnetic core (6), yoke (5), coil (4), permanent voltage-stabilizing power supply and magnetic pole (7), ferromagnetic core (6) closely connects yoke (5) and magnetic pole (7), the upper winding around (4) of ferromagnetic core (6), yoke (5) is around crystallizer, magnetic pole (7) is designed to rectangle, magnetic pole (7) is highly greater than ferromagnetic core (6) highly, height increase scope is 50mm ~ 200mm, and magnetic pole (7) transverse width and ferromagnetic core (6) are consistent.
2. a kind of electro-magnetic braking device making in continuous cast mold internal magnetic field set of regions as claimed in claim 1, it is characterized in that: the setting height(from bottom) of this electro-magnetic braking device is 150mm ~ 400mm apart from the distance of meniscus in crystallizer, and electromagnetic braking upper surface is positioned at submersed nozzle exit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320865583.5U CN203621423U (en) | 2013-12-25 | 2013-12-25 | Electromagnetism braking device for centralizing magnetic area in continuous casting crystallizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320865583.5U CN203621423U (en) | 2013-12-25 | 2013-12-25 | Electromagnetism braking device for centralizing magnetic area in continuous casting crystallizer |
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| Publication Number | Publication Date |
|---|---|
| CN203621423U true CN203621423U (en) | 2014-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320865583.5U Expired - Fee Related CN203621423U (en) | 2013-12-25 | 2013-12-25 | Electromagnetism braking device for centralizing magnetic area in continuous casting crystallizer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105195726A (en) * | 2014-06-11 | 2015-12-30 | 鞍钢股份有限公司 | Device and method for relieving negative pressure of long nozzle and impact force of molten steel |
| WO2018014663A1 (en) * | 2016-07-22 | 2018-01-25 | 东北大学 | Vertical electromagnetic braking device for controlling flow of molten steel in continuous casting crystallizer |
| CN112974749A (en) * | 2021-02-09 | 2021-06-18 | 东北大学 | Electromagnetic stirring device and method for improving feeding capacity and center quality of casting blank liquid core |
-
2013
- 2013-12-25 CN CN201320865583.5U patent/CN203621423U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105195726A (en) * | 2014-06-11 | 2015-12-30 | 鞍钢股份有限公司 | Device and method for relieving negative pressure of long nozzle and impact force of molten steel |
| WO2018014663A1 (en) * | 2016-07-22 | 2018-01-25 | 东北大学 | Vertical electromagnetic braking device for controlling flow of molten steel in continuous casting crystallizer |
| CN112974749A (en) * | 2021-02-09 | 2021-06-18 | 东北大学 | Electromagnetic stirring device and method for improving feeding capacity and center quality of casting blank liquid core |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140604 Termination date: 20211225 |
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| CF01 | Termination of patent right due to non-payment of annual fee |