CN204449241U - The device of liquid level fluctuation of crystallizer is suppressed under a kind of high pulling rate - Google Patents
The device of liquid level fluctuation of crystallizer is suppressed under a kind of high pulling rate Download PDFInfo
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- CN204449241U CN204449241U CN201520118359.9U CN201520118359U CN204449241U CN 204449241 U CN204449241 U CN 204449241U CN 201520118359 U CN201520118359 U CN 201520118359U CN 204449241 U CN204449241 U CN 204449241U
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Abstract
Suppress the device of liquid level fluctuation of crystallizer under the utility model discloses a kind of high pulling rate, belong to metallurgical technology optimisation technique field.The utility model comprises conflux mechanism, diversion mechanism and bindiny mechanism, water trap side is provided with coupled logical converging inlet, and water trap inside is provided with flow-stopping plate, and water trap top is provided with circular port, this circular port is connected with the tube connector above it, tube connector with go out head piece and be connected; Current divider is a cuboid, and current divider top is provided with some through holes, and current divider bottom is provided with rectangular recess; Go out head piece to be connected with davit, davit is connected with current divider, and large davit one end is connected with current divider, and the large davit other end is connected with the external world.The utility model can suppress liquid level fluctuation of crystallizer under high pulling rate; and the lower circulating flow strength that can weaken in crystallizer; allow most of field trash move to the protected slag in molten steel surface with liquid stream absorb, the coat on its surface can also absorption portion field trash, can effectively remove molten steel inclusion.
Description
Technical field
The utility model relates to metallurgical technology optimisation technique field, more particularly, suppresses the device of liquid level fluctuation of crystallizer under relating to a kind of high pulling rate.
Background technology
In the production process of continuous casting process, molten steel enters crystallizer from tundish by submersed nozzle.When casting speed is higher, larger level fluctuation is had in crystallizer, this is because under same crystallizer width, pulling rate increases, speed and the flow of stream plume delivery port side opening increase, stream stock increases the impulsive force of crystallizer leptoprosopy, the upper circulating flow strength flowing stock is caused to increase, the shearing force of upper recirculating zone and the top of the slag increases, cause the fluctuation in various degree of whole mold liquid level, wherein particularly evident with the part fluctuation close to meniscus, and high pulling rate can cause the increase of lower circulating flow strength, a large amount of field trash is flow to into molten steel deep with liquid, more difficult floating.
The harm that mould liquid level larger fluctuation is brought mainly contains: (1) liquid fluctuating can increase the slag risk of crystallizer molten steel, and inclusion in casting blank content overproof will have a strong impact on the quality of strand and final products; (2) liquid fluctuating can affect the three-decker of crystallizer protecting residue, destroys lubricity and the balance heat transfer of crystallizer protecting residue; (3), when liquid level fluctuation of crystallizer is serious, the lobe of strand even can be caused to leak, be mingled with the pernicious production accidents such as leakage.
How under the prerequisite ensureing output and product quality, to suppress liquid level fluctuation of crystallizer, be a puzzlement Ferrous Metallurgy manufacturing enterprise difficult problem for many years.Pass through patent retrieval, existing relevant technical scheme is open at present, as China Patent No.: 200710047480.7, the applying date: on October 26th, 2007, invention and created name is: the continuous casting crystallizer device of controlled liquid level flow field and fluctuation, the device of the suppression liquid level fluctuation of crystallizer of this application case is by submersed nozzle, smoothing roll, guide roller, transfer to roller, consumption metallic plate, covering slag, strand, water-cooled crystallizer and dummy bar composition, this device newly adds smoothing roll on traditional continuous cast mold equipment, guide roller, transfer to roller and consumption metallic plate, crystallization control device liquid fluctuating is carried out by carrying consumption metallic plate in crystallizer, wherein consumption metallic plate composition is identical with the composition of continuous casting billet in crystallizer.For this application case, applicant has done repeatedly analog computation and has found: (1) is admitted to after in crystallizer when this consumption metallic plate, because this consumption metallic plate consumption of calorie is larger, break the thermal balance in crystallizer, reduce molten steel in mold temperature, reduce fluidity molten steel, making slag and Slag inclusion float and are difficult to carry out.(2) after this consumption metallic plate is admitted to molten steel, its fusing is not top-down, the part that the jet sprayed with submersed nozzle side opening directly contacts can melt at first, form a hole, the feeding speed calculating consumption metallic plate can be difficult to like this, in order to ensure " balance between revenue and expenditure " of molten steel and strand in crystallizer, Casting speed also can be difficult to determine.So the technical scheme that this application case provides, is difficult to be applied in actual production process.
In sum, though make many experiments and research to the control of liquid level fluctuation of crystallizer in prior art, but be finally difficult to extensive universal, trace it to its cause two: the installation cost of (1) crystallization control device liquid fluctuating is too high, and under continuous casting scene is in high temperature, skimming device is not easy to safeguard; (2) effect controlling liquid fluctuating is undesirable, even can cause new harm, lose more than gain.In casting process, how realizing the effect of good suppression liquid level fluctuation of crystallizer, and can remove inclusion content in melting steel further, to realize the smelting target of high purity steel, is a puzzlement Ferrous Metallurgy manufacturing enterprise difficult problem for many years.
Summary of the invention
1. invent the technical problem that will solve
The device that the purpose of this utility model is to overcome suppression liquid level fluctuation of crystallizer of the prior art cannot realize the effect of suppression liquid fluctuating good in crystallizer, and the difficult problem flowing to the field trash into molten steel deep with crystallizer next time can not be removed, the device of liquid level fluctuation of crystallizer is suppressed under providing a kind of high pulling rate, adopt the technical solution of the utility model, effectively can suppress the liquid fluctuating of crystallizer under high pulling rate, and then reduction slag, the odds such as the lobe leakage of strand, and effectively can remove and flow to field trash into molten steel deep next time with crystallizer.
2. technical scheme
For achieving the above object, the technical scheme that the utility model provides is:
Suppress the device of liquid level fluctuation of crystallizer under a kind of high pulling rate of the present utility model, comprise conflux mechanism, diversion mechanism and bindiny mechanism, wherein:
Described conflux mechanism comprises water trap, flow-stopping plate, goes out head piece and converging inlet, and described water trap is a cylinder, and this cylinder inside is provided with cylindrical cavity, and water trap side is provided with coupled logical converging inlet, and converging inlet upper edge tilts upward; Described water trap inside is provided with flow-stopping plate, and this flow-stopping plate is fixed on the junction of water trap and converging inlet upper edge, and flow-stopping plate tilts downwards; Described water trap top is provided with circular port, and this circular port is connected with the tube connector above it; Described goes out the rectangular block that head piece is its central band through hole in, and described tube connector is connected with the head piece that goes out above it;
Described diversion mechanism comprises current divider, and described current divider is a cuboid, and current divider top is provided with some through holes, and current divider bottom is provided with rectangular recess;
Described bindiny mechanism comprises davit and large davit, and described four angles going out head piece upper surface are connected with one end of 4 davits respectively, and the other end of above-mentioned 4 davits is connected with current divider lower surface; Described large davit one end is connected with the central point of current divider upper surface, and the large davit other end is connected with the external world;
Above-mentioned conflux mechanism, diversion mechanism and bindiny mechanism are made up of mild steel sections, and the surfaces externally and internally of described mild steel sections is equipped with coat.
Further improve as of the present utility model, described converging inlet upper edge positive pitch=downward inclination angle × 2 of submersed nozzle side opening.
Further improve as of the present utility model, the downward inclination angle of described flow-stopping plate is 16 °.
Further improve as of the present utility model, described large davit is connected with tundish bottom or outside support.
Further improve as of the present utility model, described current divider top is provided with 6 through holes, and above-mentioned 6 through holes are symmetrical about large davit.
3. beneficial effect
The technical scheme adopting the utility model to provide, compared with prior art, has following remarkable result:
(1) device of liquid level fluctuation of crystallizer is suppressed under a kind of high pulling rate of the present utility model, by conflux mechanism, diversion mechanism and bindiny mechanism together constitute the device of the suppression liquid level fluctuation of crystallizer of ad hoc structure, found by hydraulic model trial: casting speed is larger, the jet intensity of submersed nozzle side opening is larger, the intensity that jet under being tilted to is ejected into crystallizer wall is larger, the liquid flowing strength of up and down two recirculating zones formed is larger, due to the shearing force of upper backflow, there is larger fluctuation in mold liquid level, also not easily float with the field trash flow to next time into molten steel deep.The device of liquid level fluctuation of crystallizer is suppressed to introduce in water trap by this jet by converging inlet before the jet hit crystallizer wall under being tilted under a kind of high pulling rate of the present utility model, in water trap, momentum of impinging jet reduces and is disperseed, simultaneously due to the effect of flow-stopping plate in water trap, jet is difficult to be flowed out by converging inlet again, flow out by going out head piece after being introduced into the momentum of impinging jet reduction of water trap, meet current divider and be evenly dispersed, finally flowed out by the current divider mouth of a river and contact with covering slag, due to the effect of current divider side plate, liquid stream can not circumvent current divider and directly impact crystallizer wall, liquid level fluctuation of crystallizer is well suppressed, major part field trash also directly guides covering slag into by this device, effectively liquid level fluctuation of crystallizer is inhibit while guarantee inclusion removal, avoid the harm that mould liquid level larger fluctuation is brought, improve the flow field in crystallizer.
(2) suppress the device of liquid level fluctuation of crystallizer under a kind of high pulling rate of the present utility model, the component of its coat is 85%CaO, 1.8%MgO, 3.2%MnO, 0.5%Al
2o
3, 1.5%SiO
2, 0.05%FeO, 0.15%Fe
2o
3, 4%ZrO
2, 3.8%Cr
2o
3this coat not only has high temperature resistant, erosion resisting, also there is the effect of absorption inclusion content in melting steel, the device of liquid level fluctuation of crystallizer is suppressed under using high pulling rate of the present utility model, its coat is with the process of steel contacts, effectively can remove the field trashes such as alundum (Al2O3), manganous silicate and the calcium aluminate in molten steel, realize the further removal to inclusion content in melting steel, to reach the smelting target of high purity steel.
(3) suppress the device of liquid level fluctuation of crystallizer under a kind of high pulling rate of the present utility model, reasonable in design, low cost of manufacture, is convenient to promote the use of.
Accompanying drawing explanation
Fig. 1 is the main TV structure schematic diagram suppressing the device of liquid level fluctuation of crystallizer under a kind of high pulling rate of the present utility model;
Fig. 2 is the left TV structure schematic diagram suppressing the device of liquid level fluctuation of crystallizer under a kind of high pulling rate of the present utility model;
Fig. 3 is the plan structure schematic diagram suppressing the device of liquid level fluctuation of crystallizer under a kind of high pulling rate of the present utility model;
Structural representation when Fig. 4 is the utility model application.
Number in the figure illustrates: 1, water trap; 2, flow-stopping plate; 3, head piece is gone out; 4, davit; 5, the current divider mouth of a river; 6, large davit; 7, current divider; 8, current divider side plate; 9, converging inlet; 10, submersed nozzle; 11, covering slag; 12, crystallizer wall; 13, jet.
Detailed description of the invention
For understanding content of the present utility model further, in conjunction with the accompanying drawings and embodiments the utility model is described in detail.
Embodiment 1
As shown in Figure 1, Figure 2 and Figure 3, the device of liquid level fluctuation of crystallizer is suppressed under a kind of high pulling rate of the present embodiment, comprise conflux mechanism, diversion mechanism and bindiny mechanism, the jet 13 of submersed nozzle 10 side opening ejection first can be assembled by conflux mechanism, reduce its momentum, then the liquid stream that momentum reduces by diversion mechanism evenly discharges, and liquid level fluctuation of crystallizer is well suppressed.Bindiny mechanism is respectively used to connect conflux mechanism and diversion mechanism, diversion mechanism and the external world.
Conflux mechanism comprises water trap 1, flow-stopping plate 2, goes out head piece 3 and converging inlet 9, and water trap 1 is a cylinder, and this cylinder inside is provided with cylindrical cavity, and water trap 1 side is provided with coupled logical converging inlet 9, and converging inlet 9 upper edge tilts upward; Water trap 1 inside is provided with flow-stopping plate 2, and this flow-stopping plate 2 is fixed on the junction of water trap 1 and converging inlet 9 upper edge, and flow-stopping plate 2 tilts downwards; Water trap 1 top is provided with circular port, and this circular port is connected with the tube connector above it; Go out the rectangular block that head piece 3 is its central band manhole in, tube connector is connected with the head piece 3 that goes out above it.
Diversion mechanism comprises current divider 7, and current divider 7 is a cuboid, and current divider 7 top is provided with 6 through holes, and above-mentioned 6 through holes are symmetrical about large davit 6, and current divider 7 bottom is provided with rectangular recess.
Bindiny mechanism comprises davit 4 and large davit 6, and four angles going out head piece 3 upper surface are connected with one end of 4 davits 4 respectively, and the other end of above-mentioned 4 davits 4 is connected with current divider 7 lower surface; Large davit 6 one end is connected with the central point of current divider 7 upper surface, and large davit 6 other end is connected with tundish bottom or outside support.
In the present embodiment, water trap 1 is cylinder, this cylinder inside is provided with cylindrical cavity, flow-stopping plate 2 is solid platy structure, go out the rectangular block that head piece 3 is its central band manhole in, davit 4 and large davit 6 are cylindrical structure, and current divider 7 is rectangular structure, and current divider 7 top is provided with 6 through holes, above-mentioned 6 through holes are symmetrical about large davit 6, and current divider 7 bottom is provided with rectangular recess.Be the plate slab crystallizer of 400mm × 115mm for cross-sectional area, suppress the concrete dimensional requirement of the device of liquid level fluctuation of crystallizer as follows under the high pulling rate of the present embodiment: the internal diameter of water trap 1 is 50mm, and external diameter is 60mm, and interior height is 40mm, and outer height is 60mm; Flow-stopping plate 2 is of a size of 44mm × 40mm × 5mm, and flow-stopping plate 2 tilts downwards, and itself and horizontal line angle are 16 °; Go out head piece 3 and be of a size of 77mm × 65mm × 10mm, the radius going out manhole on head piece 3 is 20mm; Davit 4 is highly 14.38mm, and section radius is 5mm; Large davit 6 section radius is 10mm, and length is 1000mm; Current divider 7 is of a size of 300mm × 75mm × 25mm, 6 through holes on current divider 7 top are called the current divider mouth of a river 5, the combination (as shown in Figure 3) of the shape at the current divider mouth of a river 5 to be the rectangle of 37.63mm × 18mm and two diameters the be semicircle of 18mm, current divider 7 lower rectangular groove is of a size of 290mm × 65mm × 5mm; Downward inclination angle × 2 of positive pitch=submersed nozzle 10 side opening, converging inlet 9 upper edge, in the present embodiment, the downward inclination angle of submersed nozzle 10 side opening is 25 °, so converging inlet 9 upper edge positive pitch gets 50 °; In the present embodiment, casting speed gets 1.8m/min, in continuous casting steel billet is produced, belong to higher pulling rate.The device of liquid level fluctuation of crystallizer is suppressed to be made up of mild steel sections under the high pulling rate of the present embodiment, surfaces externally and internally all brushing coats of mild steel sections.This coat is made up of the component of following mass percent: 85%CaO, 1.8%MgO, 3.2%MnO, 0.5%Al
2o
3, 1.5%SiO
2, 0.05%FeO, 0.15%Fe
2o
3, 4%ZrO
2, 3.8%Cr
2o
3.
Suppress the device of liquid level fluctuation of crystallizer under a kind of high pulling rate of the present embodiment, its preparation method is as follows:
Prepared by step one, mild steel parts:
Suppress the Structure Quasi of the device of liquid level fluctuation of crystallizer for mild steel steel plate according under the high pulling rate of the present embodiment, by coarse for its surface finish, weld according to above-mentioned each part dimension, make water trap 1, flow-stopping plate 2, go out head piece 3, current divider 7 and converging inlet 9; Preparing four length is again 14.38mm, section radius is the mild steel cylinder of 5mm and by coarse for its surface finish, make davit 4, be welded on out on head piece 3 by four davits 4, wherein the bottom surface distance of center circle of every root davit 4 goes out the long back gauge of head piece 3 upper surface is 5mm, is 7.31mm apart from minor face; Preparing a section radius is again 10mm, and length is that the mild steel cylinder of 1000mm makes large davit 6, by coarse for its surface finish and be welded on the central point of current divider 7 upper surface; The metal frame (mechanics framework) of this device completes.
Step 2, coat material prepare:
Take each component according to the component requirements of coat, this coat material is made up of the component of following mass percent: 85%CaO, 1.8%MgO, 3.2%MnO, 0.5%Al
2o
3, 1.5%SiO
2, 0.05%FeO, 0.15%Fe
2o
3, 4%ZrO
2, 3.8%Cr
2o
3, said components is mixed, adds water and make it to stir into pureed;
Step 3, coating operation:
The coat homogenize material of step 2 is applied in the outer surface of mild steel sections, coat thickness is 6mm, because mild steel sections inner surface not easily adds coat, so its coat thickness is not strict with, but it is outside exposed to ensure there is mild steel, and coat thickness reaches 6mm ~ 9mm;
Step 4, maintenance drying
The device natural curing at normal temperatures 15 ~ 20 hours of liquid level fluctuation of crystallizer will be suppressed under the high pulling rate of step 3, the device of liquid level fluctuation of crystallizer is suppressed to put into oven by under the high pulling rate after natural curing: baking temperature, at 80 ~ 100 DEG C, toasts 3 hours; Baking temperature rises to 150 ~ 200 DEG C, toasts 1.5 hours; Baking temperature rises to 200 ~ 250 DEG C, toasts 1 hour; Baking temperature rises to 300 ~ 350 DEG C, toasts 1 hour; Baking is cooled to 200 ~ 250 DEG C, toasts 1 hour; Again be cooled to 80 ~ 100 DEG C, toast 1 hour, nature of coming out of the stove after baking terminates cools.
Adopt the surfaces externally and internally being attached to mild steel sections that the coat prepared of said method can be stable, under making high pulling rate, suppress the device performance of liquid level fluctuation of crystallizer to be stablized.Found by hydraulic model trial: when pulling rate is higher, submersed nozzle 10 side opening can eject the jet 13 of higher speed, and then impel liquid level fluctuation of crystallizer to aggravate, the device of liquid level fluctuation of crystallizer is suppressed to be connected with extraneous (tundish bottom or outside support) by large davit 6 under the high pulling rate of the present embodiment, thus make this device be fixed in crystallizer, the degree of depth of molten steel is entered by adjusting this device, make converging inlet 9 in this device can assemble the jet 13 (as shown in Figure 4) ejected by submersed nozzle 10 side opening to greatest extent, the cylindrical cavity of jet 13 in water trap 1 converges, its momentum reduces, moved up with molten steel by being mixed in water trap 1 of bringing into of jet 13, by going out head piece 3 and with less momentum impulse current shunt 7, final liquid stream is flowed out by 6 current divider mouths of a river 5 on current divider 7 top and is contacted with covering slag 11.Mold liquid level changes slow fluctuation into by big ups and downs in the process, and fluctuating range is less, can not cause the generation of slag phenomenon, and meanwhile, liquid level keeps less fluctuation to facilitate the uniform melt of covering slag 11.Flow-stopping plate 2 in the present embodiment in water trap 1 prevents liquid stream in water trap 1 to be flowed out by converging inlet 9, current divider side plate 8 is positioned at the surrounding (surrounding of current divider 7 lower rectangular groove is called current divider side plate 8) of current divider 7 lower rectangular groove, to the diffusion of crystallizer wall 12 when current divider side plate 8 effectively can stop liquid flow impact current divider 7.The design of device due to its structure of liquid level fluctuation of crystallizer is suppressed under the high pulling rate of the present embodiment, make this device can optimize flow field under high pulling rate in crystallizer, suppress the fluctuation of mold liquid level, the field trash simultaneously effectively stoping submersed nozzle 10 side opening jet 13 to be brought into enters molten steel deep in a large number, effectively remove in molten steel while suppression liquid level fluctuation of crystallizer and be mingled with, and then improve slab quality.In addition, what deserves to be explained is, the large davit 6 in the utility model is not limit for the size of its concrete size, and refers to the davit of main lifting current divider 7, and the large davit 6 in the utility model also can be called: main davit.In like manner, the davit 4 in the utility model refers to the connector connecting head piece 3 and current divider 7, and the davit 4 in the utility model also can be called: joint pin.
Schematically above be described the utility model and embodiment thereof, this description does not have restricted, and also just one of the embodiment of the present utility model shown in accompanying drawing, actual structure is not limited thereto.So, if those of ordinary skill in the art enlightens by it, when not departing from the utility model and creating aim, design the frame mode similar to this technical scheme and embodiment without creationary, protection domain of the present utility model all should be belonged to.
Claims (5)
1. suppress a device for liquid level fluctuation of crystallizer under high pulling rate, it is characterized in that: comprise conflux mechanism, diversion mechanism and bindiny mechanism, wherein:
Described conflux mechanism comprises water trap (1), flow-stopping plate (2), goes out head piece (3) and converging inlet (9), described water trap (1) is a cylinder, this cylinder inside is provided with cylindrical cavity, water trap (1) side is provided with coupled logical converging inlet (9), and converging inlet (9) upper edge tilts upward; Described water trap (1) inside is provided with flow-stopping plate (2), this flow-stopping plate (2) is fixed on the junction of water trap (1) and converging inlet (9) upper edge, and flow-stopping plate (2) tilts downwards; Described water trap (1) top is provided with circular port, and this circular port is connected with the tube connector above it; Described goes out the rectangular block that head piece (3) is its central band through hole in, and described tube connector is connected with the head piece (3) that goes out above it;
Described diversion mechanism comprises current divider (7), and described current divider (7) is a cuboid, and current divider (7) top is provided with some through holes, and current divider (7) bottom is provided with rectangular recess;
Described bindiny mechanism comprises davit (4) and large davit (6), described four angles going out head piece (3) upper surface are connected with one end of 4 davits (4) respectively, and the other end of above-mentioned 4 davits (4) is connected with current divider (7) lower surface; Described large davit (6) one end is connected with the central point of current divider (7) upper surface, and large davit (6) other end is connected with the external world;
Above-mentioned conflux mechanism, diversion mechanism and bindiny mechanism are made up of mild steel sections, and the surfaces externally and internally of described mild steel sections is equipped with coat.
2. suppress the device of liquid level fluctuation of crystallizer under a kind of high pulling rate according to claim 1, it is characterized in that: described downward inclination angle × 2 of positive pitch=submersed nozzle (10) side opening, converging inlet (9) upper edge.
3. suppress the device of liquid level fluctuation of crystallizer under a kind of high pulling rate according to claim 1, it is characterized in that: described flow-stopping plate (2) downwards inclination angle is 16 °.
4. suppress the device of liquid level fluctuation of crystallizer under a kind of high pulling rate according to claim 1, it is characterized in that: described large davit (6) is connected with tundish bottom or outside support.
5. suppress the device of liquid level fluctuation of crystallizer under a kind of high pulling rate according to claim 1 and 2, it is characterized in that: described current divider (7) top is provided with 6 through holes, above-mentioned 6 through holes are symmetrical about large davit (6).
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| CN201520118359.9U CN204449241U (en) | 2015-02-27 | 2015-02-27 | The device of liquid level fluctuation of crystallizer is suppressed under a kind of high pulling rate |
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|---|---|---|---|
| CN201520118359.9U CN204449241U (en) | 2015-02-27 | 2015-02-27 | The device of liquid level fluctuation of crystallizer is suppressed under a kind of high pulling rate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104624995A (en) * | 2015-02-27 | 2015-05-20 | 安徽工业大学 | Device for inhibiting mold level fluctuation at high drawing speed |
| CN106077543A (en) * | 2015-05-12 | 2016-11-09 | 马鞍山尚元冶金科技有限公司 | A kind of manufacture method of liquid level fluctuation of crystallizer restraining device |
-
2015
- 2015-02-27 CN CN201520118359.9U patent/CN204449241U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104624995A (en) * | 2015-02-27 | 2015-05-20 | 安徽工业大学 | Device for inhibiting mold level fluctuation at high drawing speed |
| CN104624995B (en) * | 2015-02-27 | 2016-08-17 | 安徽工业大学 | The device of liquid level fluctuation of crystallizer is suppressed under a kind of high pulling rate |
| CN106077543A (en) * | 2015-05-12 | 2016-11-09 | 马鞍山尚元冶金科技有限公司 | A kind of manufacture method of liquid level fluctuation of crystallizer restraining device |
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