CN104801684A - Lifting type system for inhibiting fluctuating of liquid level of crystallizer at high drawing speed - Google Patents
Lifting type system for inhibiting fluctuating of liquid level of crystallizer at high drawing speed Download PDFInfo
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- CN104801684A CN104801684A CN201510240031.9A CN201510240031A CN104801684A CN 104801684 A CN104801684 A CN 104801684A CN 201510240031 A CN201510240031 A CN 201510240031A CN 104801684 A CN104801684 A CN 104801684A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
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Abstract
The invention discloses a lifting type system for inhibiting fluctuating of liquid level of a crystallizer at high drawing speed, and belongs to the technical field of optimizing of crystallizer technology. The lifting type system comprises a main unit and a lifting unit, wherein the side surface of a flow collector is provided with a flow collecting opening which is communicated with the flow collector, and a flow blocking plate is arranged in the flow collector; a flow separator is in an oblong shape, a plurality of through holes are formed in the upper part of the flow separator and are distributed from the center to the two sides, and the sizes of the through holes are successively increased; a flow outlet is connected with the flow separator through a hanging column, and the flow separator is connected with the lifting unit through a large hanging column; wheels are arranged at the two ends of a lifting vehicle, and are matched with vertical steel rails; a pulley is arranged at the top part of each steel rail, one end of a steel cable bypasses each pulley and is connected with the lifting vehicle, and the other end of each steel cable is connected with a rotary shaft of a lifting motor. The system has the advantages that the fluctuating of the liquid level of the crystallizer can be inhibited at the high drawing speed, the flow which is sprayed out of a side hole of an immersing type water opening is maximally collected at the flow collecting opening, and the nonuniformity of the amount of discharged liquid steel on the water opening of the flow separator is effectively inhibited.
Description
Technical field
The present invention relates to crystallizer process optimization technical field, more particularly, under relating to a kind of high pulling rate of lifting, suppress the system of liquid level fluctuation of crystallizer.
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.
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.
Applicant Anhui University of Technology has submitted the innovation and creation application for the problems referred to above on February 27th, 2015, its specifying information is as follows, application number: 2015100899233, invention and created name: the device suppressing liquid level fluctuation of crystallizer under a kind of high pulling rate, applicant: Anhui University of Technology, the applying date: on February 27th, 2015.But, the device of liquid level fluctuation of crystallizer is suppressed also to there is following technological deficiency under this high pulling rate: to find in (1), actual production process, its spray angle of the jet that submersed nozzle side opening ejects, jet velocity often vary, therefore converging inlet often can not assemble the jet ejected by submersed nozzle side opening timely and effectively, major part jet does not enter the device suppressing liquid level fluctuation of crystallizer, thus causes the effect of suppression liquid level fluctuation of crystallizer poor; (2), find in actual production process, the molten steel amount distribution that the current divider mouth of a river on current divider is flowed out is very uneven, thus the impact causing covering slag to accept is uneven, is unfavorable for suppression liquid level fluctuation of crystallizer.
In sum, how guaranteeing to suppress the device of liquid level fluctuation of crystallizer can play good result of use in actual production process, is the technical problem needing solution in prior art badly.
Summary of the invention
1. invent the technical problem that will solve
The object of the invention is to overcome in actual production process suppresses the device of liquid level fluctuation of crystallizer cannot realize the effect of suppression liquid fluctuating good in crystallizer, the system of liquid level fluctuation of crystallizer is suppressed under providing a kind of high pulling rate of lifting, adopt technical scheme of the present invention, 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, effectively remove and flow to field trash into molten steel deep next time with crystallizer, and converging inlet can be made to assemble the jet ejected by submersed nozzle side opening to greatest extent, effective suppression current divider mouth of a river discharges the uneven phenomenon of molten steel amount.
2. technical scheme
For achieving the above object, technical scheme provided by the invention is:
Suppress the system of liquid level fluctuation of crystallizer under the high pulling rate of a kind of lifting of the present invention, comprise main unit and lifting unit; Wherein:
Described main unit comprises conflux mechanism, diversion mechanism and bindiny mechanism, described conflux mechanism comprises water trap, flow-stopping plate, goes out head piece and converging inlet, described water trap is a cylinder, this cylinder inside is provided with cylindrical cavity, 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; Some through holes on described current divider top are along the distribution of current divider bilateral symmetry, and from the center of current divider to current divider both sides, the size of through hole increases successively;
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 lifting unit; Described main unit has two, and each main unit is all connected with lifting unit by the large davit on it;
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;
Described lifting unit comprises lift truck, wheel, rail, wirerope, lifting motor and pulley, and described lift truck two ends are provided with wheel, and described wheel matches with the rail vertically arranged; Described rail top is provided with pulley, and described wirerope one end is walked around pulley and is connected with lift truck, and the described wirerope other end is connected with the rotating shaft of lifting motor.
As a further improvement on the present invention, described lift truck is a rectangular slab, and the center of this rectangular slab is provided with rectangular through-hole; Described rectangular through-hole is connected two connecting rods be parallel to each other, described connecting rod length direction and lift truck length direction perpendicular, each connecting rod is all fixed with a large davit; Two wheels of the every one end of described lift truck are coaxially installed; Described lift truck two ends are all fixed with becket, and described lift truck is connected with wirerope by becket.
As a further improvement on the present invention, described converging inlet upper edge positive pitch=downward inclination angle × 2 of submersed nozzle side opening.
As a further improvement on the present invention, the downward inclination angle of described flow-stopping plate is 16 °.
As a further improvement on the present invention, described current divider top is provided with 6 through holes.
3. beneficial effect
Adopt technical scheme provided by the invention, compared with prior art, there is following remarkable result:
(1) system of liquid level fluctuation of crystallizer is suppressed under the high pulling rate of a kind of lifting of the present invention, the system of the suppression liquid level fluctuation of crystallizer of ad hoc structure is together constituted by main unit and lifting unit, 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.This jet can be introduced in water trap by converging inlet before the jet hit crystallizer wall under being tilted to by the system of suppression liquid level fluctuation of crystallizer of the present invention, 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 stop of current divider side plate, liquid stream can not circumvent current divider and directly impact crystallizer wall, liquid level fluctuation of crystallizer obtains good suppression, major part field trash also directly guides covering slag into by native system, 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) system of liquid level fluctuation of crystallizer is suppressed under the high pulling rate of a kind of lifting of the present invention, wherein main unit is connected with lifting unit by large davit, thus make main unit be fixed in crystallizer, the degree of depth that main unit enters molten steel is adjusted neatly by lifting unit, the converging inlet in main unit is enable to assemble the jet ejected by submersed nozzle side opening to greatest extent, in the present invention, submersed nozzle both sides are equipped with side opening, the jet that submersed nozzle both sides side opening ejects is assembled to greatest extent by the converging inlet in two main unit respectively, effectively inhibit the fluctuation of mold liquid level, in the present invention, lift truck is to weld the mode stationary body unit hung, four wheels on lift truck match with the rail vertically arranged, lift truck is moved up and down along rail, be provided with two effects like this, one is make lift truck smoothly movement up and down, and two is prevent lift truck from occurring to move forward and backward, if because lift truck occurs movable, so main unit also can move forward and backward, and main unit and the wide wall of crystallizer may be caused like this to collide, cause the damage of device.
(3) applicant finds through a large amount of field experiment, if the current divider mouth of a river size on current divider is the same, the incoming flow with certain kinetic energy impacts on current divider, the molten steel amount flowed out near the current divider mouth of a river at current divider center is greater than the molten steel amount that other current divider mouths of a river are flowed out, the impact causing covering slag to accept is uneven, is unfavorable for suppressing liquid level fluctuation of crystallizer; The system of liquid level fluctuation of crystallizer is suppressed under the high pulling rate of a kind of lifting of the present invention, wherein current divider top is provided with some through holes (through hole is herein the current divider mouth of a river), above-mentioned some through holes distribute along current divider bilateral symmetry, and from the center of current divider to current divider both sides, the size of through hole increases successively, above-mentioned setting restrained effectively on the current divider mouth of a river and discharges the uneven phenomenon of molten steel amount, be conducive to suppressing liquid level fluctuation of crystallizer, achieve the good result of use of native system.
(4) suppress the system of liquid level fluctuation of crystallizer under the high pulling rate of a kind of lifting of the present invention, wherein the component of 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
3, this coat not only has high temperature resistant, erosion resisting, also has the effect of absorption inclusion content in melting steel; When using the system of suppression liquid level fluctuation of crystallizer of the present invention, 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.
(5) suppress the system of liquid level fluctuation of crystallizer under the high pulling rate of a kind of lifting of the present invention, 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 of main unit in the present invention;
Fig. 2 is the left TV structure schematic diagram of main unit in the present invention;
Fig. 3 is the plan structure schematic diagram of main unit in the present invention;
Fig. 4 is the main TV structure schematic diagram suppressing the system of liquid level fluctuation of crystallizer under the high pulling rate of a kind of lifting of the present invention;
Fig. 5 is the plan structure schematic diagram of lifting unit in the present invention.
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; 14, lift truck; 15, wheel; 16, rail; 17, wirerope; 18, lifting motor; 19, pulley.
Detailed description of the invention
For understanding content of the present invention further, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Embodiment 1
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, suppress the system of liquid level fluctuation of crystallizer under the high pulling rate of a kind of lifting of the present embodiment, comprise main unit and lifting unit.Wherein: main unit comprises 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, the liquid stream that then 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 lifting unit.
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 the through hole on current divider 7 top is called the current divider mouth of a river 5.Above-mentioned 6 through holes are along the distribution of current divider 7 bilateral symmetry, and from the center of current divider 7 to current divider 7 both sides, the size of through hole increases successively.It should be noted that; applicant finds through a large amount of field experiment; if the current divider mouth of a river 5 size on current divider 7 is the same; the incoming flow with certain kinetic energy impacts on current divider 7; the molten steel amount flowed out near the current divider mouth of a river 5 at current divider 7 center is greater than the molten steel amount that other current divider mouths of a river 5 are flowed out, and the impact causing covering slag 11 to accept is uneven.The size at the current divider mouth of a river 5 is set to the closer to current divider 7 center less by applicant, restrained effectively on the current divider mouth of a river 5 and discharges the uneven phenomenon of molten steel amount.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 lifting unit.Main unit has two, and each main unit is all connected with lifting unit by the large davit 6 on it.
Lifting unit comprises lift truck 14, wheel 15, rail 16, wirerope 17, lifting motor 18 and pulley 19, and lift truck 14 two ends are provided with wheel 15, and wheel 15 matches with the rail 16 vertically arranged; Rail 16 top is provided with pulley 19, and wirerope 17 one end is walked around pulley 19 and is connected with lift truck 14, and wirerope 17 other end is connected with the rotating shaft of lifting motor 18.
Further, as shown in Figure 4 and Figure 5, lift truck 14 is a rectangular slab, and the center of this rectangular slab is provided with rectangular through-hole; Rectangular through-hole is connected two connecting rods be parallel to each other, connecting rod length direction and lift truck 14 length direction perpendicular, each connecting rod is all fixed with a large davit 6; Two wheels 15 of the every one end of lift truck 14 are coaxially installed; Lift truck 14 two ends are all fixed with becket, and lift truck 14 is connected with wirerope 17 by becket.
In the present embodiment, two main unit are all welded and fixed with the connecting rod of two on lift truck 14 respectively by the large davit 6 on it, the rail 16 that lift truck 14 is vertically arranged along two ends slides up and down, lift truck 14 two ends are all connected wirerope 17, the wirerope 17 at lift truck 14 two ends connects the rotating shaft of same lifting motor 18, under the synchronous drive of lifting motor 18, the wirerope 17 at lift truck 14 two ends jointly pulls lift truck 14 and slides up and down, thus the moving up and down of realization body unit.
In the present embodiment, lift truck 14 is responsible for welding the mode stationary body unit (large davit 6 welding namely in main unit is suspended on lift truck 14) hung; Four wheels 15 on lift truck 14 match with the rail 16 vertically arranged, lift truck 14 is moved up and down along rail 16, be provided with two effects like this, one is make lift truck about 14 smoothly movement, two be prevent lift truck 14 from occurring movable (front and back herein, refer to the normal direction of the wide wall of crystallizer; The wide wall of crystallizer is not shown in the accompanying drawings, crystallizer wall 12 is the narrow wall of crystallizer, the wide wall of crystallizer and crystallizer wall 12 form the wall of crystallizer jointly, wherein the wide wall of crystallizer and crystallizer wall 12 perpendicular), if because lift truck 14 occurs movable, so main unit also can move forward and backward, and main unit and the wide wall of crystallizer may be caused like this to collide, cause the damage of device.The rectangular through-hole at lift truck 14 center is used for passing through of submersed nozzle 10.
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, current divider 7 top is provided with 6 through holes, above-mentioned 6 through holes are along the distribution of current divider 7 bilateral symmetry, and from the center of current divider 7 to current divider 7 both sides, the size of through hole increases successively.Current divider 7 bottom is provided with rectangular recess.Be the plate slab crystallizer of 400mm × 115mm for cross-sectional area, in the present embodiment, the concrete dimensional requirement of main unit is as follows: 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 shape at the current divider mouth of a river 5 is the combination (as shown in Figure 3) of rectangle and two semicircles, and 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.In the present embodiment, main unit is made up of mild steel sections, 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 system of liquid level fluctuation of crystallizer under the high pulling rate of the lifting of the present embodiment, its preparation method is as follows:
Prepared by step one, mild steel parts:
According to the Structure Quasi of main unit in the present embodiment for mild steel steel plate, 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 main unit 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
By the main unit of step 3 natural curing at normal temperatures 15 ~ 20 hours, the main unit after natural curing is put into oven: 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;
Step 5, install lifting unit additional
Lifting unit is assembled according to the structure of lifting unit in the present embodiment; According to step one to step 4, prepare two main unit equally respectively, two main unit are all welded and fixed with the connecting rod of two on lift truck 14 respectively by the large davit 6 on it, complete the preparation of whole system.
Adopt the surfaces externally and internally being attached to mild steel sections that the coat prepared of said method can be stable, make main unit stable performance.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, in the present embodiment, main unit is connected with lifting unit by large davit 6, thus make main unit be fixed in crystallizer, the degree of depth of molten steel is entered by lifting unit adjustment main unit, the jet 13 (as shown in Figure 4) converging inlet 9 in main unit can being assembled to greatest extent ejected by submersed nozzle 10 side opening, in the present embodiment, submersed nozzle 10 both sides are equipped with side opening, the jet 13 that submersed nozzle 10 both sides side opening ejects is assembled to greatest extent by the converging inlet 9 in two main unit respectively, 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 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 system due to its structure of liquid level fluctuation of crystallizer is suppressed under the high pulling rate of the lifting of the present embodiment, make this system 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 present invention 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 present invention also can be called: main davit.In like manner, the davit 4 in the present invention refers to the connector connecting head piece 3 and current divider 7, and the davit 4 in the present invention also can be called: joint pin.
Schematically above be described the present invention and embodiment thereof, this description does not have restricted, and also just one of the embodiments of the present invention 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 invention aim, designing the frame mode similar to this technical scheme and embodiment without creationary, all should protection scope of the present invention be belonged to.
Claims (5)
1. suppress a system for liquid level fluctuation of crystallizer under the high pulling rate be elevated, it is characterized in that: comprise main unit and lifting unit; Wherein:
Described main unit comprises conflux mechanism, diversion mechanism and bindiny mechanism, 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; Some through holes on described current divider (7) top are along the distribution of current divider (7) bilateral symmetry, and from the center of current divider (7) to current divider (7) both sides, the size of through hole increases successively;
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 lifting unit; Described main unit has two, and each main unit is all connected with lifting unit by the large davit (6) on it;
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;
Described lifting unit comprises lift truck (14), wheel (15), rail (16), wirerope (17), lifting motor (18) and pulley (19), described lift truck (14) two ends are provided with wheel (15), and described wheel (15) matches with the rail (16) vertically arranged; Described rail (16) top is provided with pulley (19), described wirerope (17) one end is walked around pulley (19) and is connected with lift truck (14), and described wirerope (17) other end is connected with the rotating shaft of lifting motor (18).
2. suppress the system of liquid level fluctuation of crystallizer under the high pulling rate of a kind of lifting according to claim 1 and 2, it is characterized in that: described lift truck (14) is a rectangular slab, and the center of this rectangular slab is provided with rectangular through-hole; Described rectangular through-hole is connected two connecting rods be parallel to each other, described connecting rod length direction and lift truck (14) length direction perpendicular, each connecting rod is all fixed with a large davit (6); Two wheels (15) of the every one end of described lift truck (14) are coaxially installed; Described lift truck (14) two ends are all fixed with becket, and described lift truck (14) is connected with wirerope (17) by becket.
3. suppress the system of liquid level fluctuation of crystallizer under the high pulling rate of a kind of lifting 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.
4. suppress the system 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 °.
5. suppress the system of liquid level fluctuation of crystallizer under the high pulling rate of a kind of lifting according to claim 1 and 2, it is characterized in that: described current divider (7) top is provided with 6 through holes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510240031.9A CN104801684B (en) | 2015-05-12 | 2015-05-12 | Lifting type system for inhibiting fluctuating of liquid level of crystallizer at high drawing speed |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116493563A (en) * | 2023-06-28 | 2023-07-28 | 江苏永钢集团有限公司 | Crystallizer liquid level control system |
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| JPH10128513A (en) * | 1996-10-30 | 1998-05-19 | Sumitomo Metal Ind Ltd | Division mold for continuous casting |
| CN101219464A (en) * | 2007-10-26 | 2008-07-16 | 上海大学 | Continuous casting crystallizer capable of controlling liquid level flow field and wave motion |
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| CN116493563A (en) * | 2023-06-28 | 2023-07-28 | 江苏永钢集团有限公司 | Crystallizer liquid level control system |
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| CN104801684B (en) | 2017-02-22 |
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