CN114682747B - Slab caster casting blank corner spray cooling narrow-face foot roller and slab caster - Google Patents
Slab caster casting blank corner spray cooling narrow-face foot roller and slab caster Download PDFInfo
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- CN114682747B CN114682747B CN202210328451.2A CN202210328451A CN114682747B CN 114682747 B CN114682747 B CN 114682747B CN 202210328451 A CN202210328451 A CN 202210328451A CN 114682747 B CN114682747 B CN 114682747B
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- 238000005266 casting Methods 0.000 title claims abstract description 138
- 239000007921 spray Substances 0.000 title claims abstract description 115
- 238000001816 cooling Methods 0.000 title claims abstract description 76
- 208000029154 Narrow face Diseases 0.000 title claims abstract description 69
- 239000000498 cooling water Substances 0.000 claims abstract description 124
- 238000005507 spraying Methods 0.000 claims abstract description 110
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 46
- 230000000712 assembly Effects 0.000 claims description 28
- 238000000429 assembly Methods 0.000 claims description 28
- 238000012544 monitoring process Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 8
- 238000007670 refining Methods 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 abstract 1
- 238000009749 continuous casting Methods 0.000 description 26
- 238000005452 bending Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 5
- 239000008400 supply water Substances 0.000 description 5
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 240000000233 Melia azedarach Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
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- 229910000859 α-Fe Inorganic materials 0.000 description 1
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
- B22D11/1243—Accessories for subsequent treating or working cast stock in situ for cooling by using cooling grids or cooling plates
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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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
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Abstract
The utility model discloses a slab caster and a narrow-face foot roller for spray cooling of a casting blank corner of the slab caster, comprising a foot roller frame, a cooling water channel, a first spray assembly and a second spray assembly, wherein the first spray assembly and the second spray assembly are connected with the foot roller frame and are arranged between foot rollers; the first spraying assembly and the second spraying assembly are oppositely arranged and distributed along two side edges of the foot roller frame respectively and are used for cooling narrow-surface corners of the casting blank. According to the utility model, the cooling water channels are arranged in the foot roller frames, the first spraying component and the second spraying component are oppositely arranged between the foot rollers along the two sides of the width direction of the foot roller frames and are communicated with the cooling water channels for spraying and cooling the narrow-surface corners of the casting blank, so that the strong cooling of the narrow-surface corners of the casting blank can be realized, and the process of refining the microstructure circulation phase-change crystal grains and dispersing and separating microalloy carbonitride can be satisfied.
Description
Technical Field
The utility model relates to the technical field of steelmaking-continuous casting, in particular to a narrow-face foot roller for spray cooling of a casting blank corner of a slab continuous casting machine and the slab continuous casting machine.
Background
At present, the control of the corner cooling of the continuous casting slab is mainly realized by integrally increasing the water quantity of the wide surface and/or the narrow surface of the casting blank. For example, patent number 201010259985.1 discloses a method of integrally increasing the water amount of the wide and narrow surfaces of a cast slab by 2 to 5 times in the vertical section (vertical bending section) of a continuous casting machine, and cooling the surface of the cast slab at a cooling rate of 3 to 10 ℃/s. However, the method greatly increases the cooling water quantity of the wide surface and the narrow surface of the continuous casting blank as a whole, and practice shows that the method is extremely easy to cause the defects of longitudinal cracks of the wide surface of the casting blank and has limited effect of locally strongly cooling the corners of the casting blank. Meanwhile, the wide surface and the narrow surface of the casting blank in the vertical section are reinforced to be cooled, the solidification of the casting blank is accelerated, and the solidification end position of the casting blank is advanced, so that the processes of depressing the solidification end of the casting blank and the like are changed. The utility model patent number 201210348907.8 discloses a secondary cooling control method for reducing transverse cracks at the corners of a microalloy steel slab, which is characterized in that the cooling intensity of a casting blank after a crystallizer is integrally increased, so that the surface of the casting blank is cooled at a cooling speed of 3-8 ℃/s. Similarly, patent number 201810964557.5 discloses a method for eliminating transverse cracks at the corners of a cold rolled base stock, wherein precipitates on the surface layer of the stock are dissolved in a matrix by the whole of the stock in a forced cooling foot roll section. The utility model patent application Nos. 201210348907.8 and 201810964557.5 are similar to the patent application No. 201010259985.1 in that the cooling water quantity of the casting blank in the secondary cooling high temperature area is increased integrally to realize the strong cooling of the corner. In the actual implementation process, the defects of longitudinal cracks on the surface of the casting blank, changing the solidification end position of the casting blank and poor local strong cooling effect of the corner are also caused.
The utility model patent number 201510005720.1 discloses a strong spray cooling system for the corners of a casting blank, which is suitable for the width change of the casting blank and is independently regulated and controlled by water quantity, and is arranged on two sides of a vertical bending section below a narrow-face foot roller area of a continuous casting machine, so that grains of the corners of the casting blank are refined by strong cooling. The spray frame for the strong cooling of the casting blank corners realizes the strong spray cooling of the casting blank corners with nozzles aligned to different widths through a horizontal driving device. However, the space in the actual slab continuous casting vertical bending section is narrow, and the expansion control driving device is difficult to be added in the space to realize the integral horizontal movement of the spray frame. Meanwhile, the vertical bending section is in a high-temperature steam environment, and the driving structure is difficult to service for a long time.
In view of the defect that a spraying frame is difficult to drive in the patent number 201510005720.1, the utility model patent number 201510534316.3 discloses a control system and a control method for refining grains of a continuous casting billet corner structure of a strong cooling casting billet corner by additionally arranging 3-7 groups of nozzles for strong spraying cooling of the inner arc and the outer arc corners of the casting billet at the tail end of a narrow-face foot roller region of a continuous casting machine. In this patent, a strong cooling spray rack is mounted in a fixed connection below the narrow-face foot roll. However, in actual production, the crystallizer and the narrow-face foot roller extension spray frame thereof are required to be lifted into a narrow casting flow of a continuous casting machine by a crown block, and the extension strong cooling spray frame is extremely easy to be broken due to shaking of the crown block during loading. Meanwhile, a special crystallizer storage table is needed to be newly built for the crystallizer parking with an extension strong cooling spray frame.
The utility model patent number 201810329636.9 discloses a micro-alloy steel sheet billet corner crack control device and a micro-alloy steel sheet billet corner crack control process, wherein the control device comprises a newly added crystallizer narrow surface lower opening strong spray system, so that the sheet billet corner is strongly cooled at an average cooling speed of 20 ℃/s-35 ℃/s to ensure that micro-alloy carbonitride at the sheet billet corner is dispersed to precipitate, and grains of the sheet billet corner structure are thinned. However, the structure of the thin slab continuous casting machine is greatly different from that of a conventional slab, a wide slab and a super-thick slab continuous casting machine, and a foot roll structure is not arranged below the narrow surface of a crystallizer of the thin slab continuous casting machine. And the narrow-face foot roller with complex structures such as side guide rollers, narrow-face nozzles and the like is arranged below the narrow face of the conventional slab, the wide-thick slab and the ultra-thick slab continuous casting machine. The utility model patent No. 201820702023.0 also discloses a strong cold spray structure similar to the patent No. 201810329636.9, which is formed by adding a group of strong cold spray structures for the staggered arrangement of the inner arc and the outer arc of the thin slab below the narrow surface of the thin slab crystallizer, and the strong cold spray structures are only applicable to the thin slab continuous casting machine.
The utility model patent number 201911192737.7 discloses a method and a device for controlling the austenite grain size at the corner of a continuous casting slab. The device shortens the narrow-side copper plate of the crystallizer, and a plurality of rows of strong spray nozzles are arranged in a foot roller area below the narrow-side copper plate. Wherein, the upper nozzle is inclined downwards to form an included angle of 30-80 degrees with the surface of the casting blank, the lower nozzle is vertical to the surface of the casting blank for spraying, the cooling strength of the narrow surface of the casting blank after exiting the crystallizer is improved, and austenite grains at the corners of the continuous casting blank are refined. But the foot roller strong spraying device is also used for strongly cooling the narrow surface of the whole casting blank. Meanwhile, the prolonged spraying structure is similar to the utility model patent with the patent number of 201510534316.3, and is not beneficial to the on-line installation of the crystallizer.
In addition, in the academic papers entitled "development and application of micro-alloy steel continuous casting billet corner crack control technology" and "new process for controlling secondary cooling of niobium-containing micro-alloy steel continuous casting billet corner crack", a casting billet corner strong cooling structure based on a narrow-face foot roll of a crystallizer is developed, and although the casting billet corner is locally and strongly cooled and controlled by an independent loop, as can be seen from the figure, the cooling control structure is a spray frame which is installed below the foot roll and sprays the inner arc corner or inner arc and outer arc corner of the casting billet, and is essentially a practical application of patent number 201510534316.3.
Disclosure of Invention
In view of the above, the utility model provides a slab caster and a narrow-face foot roller for spray cooling of the casting blank corner of the slab caster, which can ensure that the slab corner can realize forced cooling in the continuous casting production process and simultaneously reduce the difficulty of the practical implementation process, and has simple structure and wide application range.
Specifically, the method comprises the following technical scheme:
in a first aspect, an embodiment of the utility model provides a slab caster casting blank corner spray cooling narrow-face foot roller, the narrow-face foot roller is connected below a crystallizer narrow-face outlet, the narrow-face foot roller comprises a foot roller frame, a cooling water channel, a first spray assembly and a second spray assembly, the first spray assembly and the second spray assembly are both connected with the foot roller frame and are arranged between the foot rollers, the cooling water channel is arranged in the foot roller frame and is respectively communicated with the first spray assembly and the second spray assembly, and the cooling water channel is used for providing cooling water for the first spray assembly and the second spray assembly;
the first spraying assembly and the second spraying assembly are oppositely arranged and distributed along two sides of the foot roller frame respectively, and the first spraying assembly and the second spraying assembly are both used for spraying and cooling corners of the narrow surface of the casting blank.
Optionally, the inlet port of the cooling water channel is arranged on the back of the foot roller frame, the water inlet port is connected with an external pipeline connected with the outlet end of the secondary cooling main water supply pipeline, a stop valve, a pneumatic regulating valve and a flowmeter flow monitoring unit are connected on the external pipeline, and the flowmeter flow monitoring unit is used for detecting the water supply quantity of the external pipeline and controlling the water supply quantity of the external pipeline to adapt to the blank pulling speed so as to enable the corner of the casting blank to be cooled in an intensified manner.
Optionally, the first spray assembly with the second spray assembly is for sufficient roller frame width central line symmetry sets up, the first spray assembly with the second spray assembly all includes shower and nozzle, the one end of shower with the nozzle is connected, the other end of shower with sufficient roller frame connects and with cooling water passageway intercommunication.
Optionally, the spray pipe comprises a first section and a second section, the first section is a straight section, the second section is a curved section, and the first section and the second section are connected into an integral structure;
the first section is vertically connected with the foot roller frame on the foot roller surface side, the second section is connected with the nozzle, and the second section is bent to form a preset angle towards two sides of the casting blank narrow surface corner direction;
the preset angle is used for ensuring that the axial extension lines of the second section (1312) and the nozzle are intersected with the casting blank narrow surface, and the intersection point is positioned from the corner of the casting blank narrow surface to the center direction of the casting blank narrow surface by 0-20 mm.
Optionally, the cooling water channel comprises a first cooling water channel and a second cooling water channel, the first cooling water channel and the second cooling water channel are both arranged in the foot roller frame and are respectively arranged along the height direction of the foot roller frame, and the first cooling water channel and the second cooling water channel are mutually communicated;
the inlet end of the first cooling water channel or the inlet end of the second cooling water channel is connected with the water inlet interface, and the water inlet interface is used for being connected with the external pipeline;
the first spraying assembly is communicated with the first cooling water channel, and the second spraying assembly is communicated with the second cooling water channel.
Optionally, an extension frame is connected below the foot roller frame, and the cross section of the extension frame is the same as the cross section of the foot roller frame;
the extension frame is internally provided with a connecting pipeline, and the first cooling water channel and the second cooling water channel are communicated through the connecting pipeline.
Optionally, the number of the first spraying components is multiple, the first spraying components are all communicated with the first cooling water channel, the number of the second spraying components is multiple, and the second spraying components are all communicated with the second cooling water channel;
the first spraying assemblies are distributed between adjacent foot rollers at intervals along the height direction of the foot roller frame, and the second spraying assemblies are distributed between adjacent foot rollers at intervals along the height direction of the foot roller frame;
the vertical heights of the spraying end parts of the first spraying assemblies and the spraying end parts of the second spraying assemblies from the narrow surface of the casting blank are 40-100 mm.
Optionally, the first cooling water channel and the second cooling water channel are respectively arranged in parallel along two sides of the foot roller frame.
Optionally, the nozzle is rectangular or conical;
when the nozzle is conical, the injection angle of the nozzle is 45-90 degrees;
when the nozzle is rectangular, the nozzle is 45-90 degrees along the direction of drawing the blank and perpendicular to the direction of drawing the blank;
the action width of the cooling water sprayed by the spray nozzle at the inner arc corner of the narrow surface of the casting blank and the outer arc corner of the narrow surface of the casting blank is 30-80 mm from the corresponding narrow surface corner of the casting blank to the center of the narrow surface of the casting blank.
In a second aspect, an embodiment of the utility model provides a slab caster, comprising the slab caster casting blank corner spray cooling narrow face foot roller as described above.
The technical scheme provided by the embodiment of the utility model has the beneficial effects that at least:
according to the narrow-face foot roller for spray cooling of the casting blank corner of the slab caster, the cooling water channels are arranged in the foot roller frames, the first spray assemblies and the second spray assemblies are oppositely arranged between the foot rollers along the two sides of the width direction of the foot roller frames and are respectively communicated with the cooling water channels for spray cooling of the corner of the narrow face of the casting blank, the process that the microstructure of the corner of the narrow face of the casting blank is strongly cooled to refine the microstructure of the corner of the narrow face of the casting blank and the micro-alloy carbonitride is dispersed and separated out is met, the cooling water channels, the first spray assemblies and the second spray assemblies communicated with the cooling water channels are connected on the basis of the original structure of the foot roller of the narrow face of the casting blank, additional operation equipment is not needed, and continuous casting slab corners with different steel types and different section sizes are strongly sprayed and cooled in the narrow-face foot roller area of the caster, and the continuous casting caster is simple in structure and convenient to apply.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a front view of a narrow face foot roller according to an embodiment of the present utility model.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a schematic view of the structure of the narrow-face foot roller according to the embodiment of the utility model when in operation.
Reference numerals in the drawings are respectively expressed as:
1-a narrow-face foot roller; 11-a foot roller frame; 12-cooling water channels; 121-a first cooling water channel; 122-a second cooling water channel; 13-a first spray assembly; 131-a spray pipe; 1311-a first section; 1312-a second section; 132-nozzles; 14-a second spray assembly; 15-foot rollers; 2-crystallizer; 3-casting blank narrow surfaces; 4-a predetermined angle; 5-extending the frame; 51-connecting pipelines; 6-spray angle; 7-original cooling nozzle of narrow face foot roller.
Specific embodiments of the present utility model have been shown by way of the above drawings and will be described in more detail below. The drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to the specific embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In order to make the technical scheme and advantages of the present utility model more apparent, embodiments of the present utility model will be described in further detail with reference to the accompanying drawings.
Unless defined otherwise, technical or scientific terms used herein should be understood to have the meaning as understood by one of ordinary skill in the art to which this utility model belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.
For the purpose of facilitating an understanding of the present utility model, the general structure of a spray cooling narrow-face foot roll for a slab caster casting billet corner and its application are exemplarily described herein.
Fig. 1 is a front view of a narrow-face foot roller according to an embodiment of the present utility model, fig. 2 is a top view of fig. 1, and fig. 3 is a schematic structural view of the narrow-face foot roller according to an embodiment of the present utility model when in operation.
As shown in fig. 1 to 3, the embodiment of the utility model provides a slab caster casting blank corner spray cooling narrow-face foot roller, the narrow-face foot roller 1 is connected below a narrow-face outlet of a crystallizer 2, the narrow-face foot roller 1 comprises a foot roller frame 11, a cooling water channel 12, a first spray assembly 13 and a second spray assembly 14, the first spray assembly 13 and the second spray assembly 14 are connected with the foot roller frame 11 and are arranged between the foot rollers 15, and the cooling water channel 12 is arranged in the foot roller frame 11 and is respectively communicated with the first spray assembly 13 and the second spray assembly 14; the cooling water channel 12 is used for providing cooling water for the first spray assembly 13 and the second spray assembly 14; the first spraying component 13 and the second spraying component 14 are oppositely arranged and distributed along two sides of the foot roller frame 11 respectively, and the first spraying component 13 and the second spraying component 14 are used for spraying and cooling the corners of the casting blank narrow surface 3.
According to the narrow-face foot roller for spray cooling of the casting blank corner of the slab caster, the cooling water channels are arranged in the foot roller frames, the first spray assemblies and the second spray assemblies are oppositely arranged between the foot rollers along the two sides of the width direction of the foot roller frames and are respectively communicated with the cooling water channels for spray cooling of the corner of the narrow face of the casting blank, the strong cooling of the tissue of the corner of the casting blank is met, the tissue cycle phase change grain refinement and microalloy carbonitride dispersion precipitation process of the casting blank is met, the cooling water channels, the first spray assemblies and the second spray assemblies communicated with the cooling water channels are connected on the basis of the original structure of the foot roller of the narrow face of the casting blank, no additional operation equipment is needed, and the strong spray cooling of continuous casting slab corners with different steel types and different section sizes in the narrow-face foot roller area of the caster is realized.
As shown in fig. 1 and 3, an inlet port of the cooling water channel 12 is arranged on the back surface of the foot roller frame 11, a water inlet port is connected with an external pipeline connected with the outlet end of the secondary cooling main water supply pipeline, a stop valve, a pneumatic regulating valve and a flowmeter flow monitoring unit are connected on the external pipeline, and the flowmeter flow monitoring unit is used for detecting the water supply quantity of the external pipeline and controlling the water supply quantity of the external pipeline to adapt to the blank pulling speed so as to enable the corner of the narrow surface 3 of the casting blank to be cooled in an intensified manner.
On the basis of original narrow face foot roller, at foot roller frame 11's internal connection cooling water passageway 12, the import interface of cooling water passageway 12 is connected with two cold main water supply lines through external pipeline, forms independent water supply line, need not to increase extra water supply equipment, reduces enterprise's operation cost to convenient, easy operation when connecting, and cooling water passageway 12 is independent return circuit, but independent automatically regulated water yield even shut down, be applicable to whole steel casting, the flexibility is strong.
On the basis of the original cooling nozzle 7 of the narrow-face foot roller, a first spraying component 13 and a second spraying component 14 are added to the two sides of the narrow-face foot roller, the horizontal direction can be parallel to the original cooling nozzle 7 of the narrow-face foot roller or vertically offset by 5-20 mm, the horizontal distance between the first spraying component 13 and the second spraying component 14 and the original cooling nozzle 7 of the narrow-face foot roller can be adjusted according to the width of the narrow face 3 of the casting blank, namely the thickness of the casting blank, the corresponding two side corner parts of the narrow face 3 of the casting blank are guaranteed, the corner parts of the narrow face 3 of the casting blank can be sprayed and cooled, the structure is simple, and the installation on the production site is simple.
The cooling water channel 12 is connected with a stop valve, a pneumatic regulating valve and a flow meter flow monitoring unit, and is used for detecting and controlling the water supply quantity of an external pipeline, wherein the water supply quantity can be regulated according to the billet drawing speed of a casting billet, and the water quantity floats upwards by 20% on the basis of the water quantity meeting the micro-alloy carbonitride dispersion precipitation and austenite-ferrite rapid transformation of four angle skins of the casting billet at the highest da Lian casting drawing speed within the depth range of 0 mm-10 mm.
The cooling water channel 12, the first spraying component 13 and the second spraying component 14 are all arranged on the foot roller frame 11 to form an integral structure integrally, the connection positions of the cooling water channel 12, the first spraying component 13 and the second spraying component 14 can be adjusted according to the thickness of an actual production casting blank, the strong cooling of the narrow surface 3 corner parts of the casting blank with different section sizes can be realized in the continuous casting production process, the grain boundary carbonitride of the narrow surface 3 corner parts of the casting blank is eliminated to be concentrated and precipitated in a chain shape, the corner tissues of the casting blank are highly plasticized, and the cooling water channel, the first spraying component 13 and the second spraying component 14 can be applied to production conditions of conventional casting blanks, wide casting blanks, extra-thick casting blanks and the like.
As shown in fig. 2 and 3, the first spray assembly 13 and the second spray assembly 14 are symmetrically arranged with respect to the width center line of the foot roller frame 11, the first spray assembly 13 and the second spray assembly 14 each include a spray pipe 131 and a nozzle 132, one end of the spray pipe 131 is connected with the nozzle 132, and the other end of the spray pipe 131 is connected with the foot roller frame 11 and communicated with the cooling water passage 12.
The first spraying component 13 and the second spraying component 14 are symmetrically arranged relative to the width center line of the foot roller frame 11, the first spraying component 13 and the second spraying component 14 are respectively formed by connecting a spraying pipe 131 and a nozzle 132, one end of the spraying pipe 131 is connected with the foot roller frame 11 in a threaded or welded mode and is communicated with the cooling water channel 12, water is stably supplied to the nozzle 132, the nozzle 132 is in threaded connection with the spraying pipe 131, and the installation, the disassembly and the maintenance of the nozzle 132 are facilitated.
As shown in fig. 2 and 3, the shower pipe 131 includes a first section 1311 and a second section 1312, the first section 1311 being a straight section, the second section 1312 being a curved section, the first section 1311 and the second section 1312 being connected as a unitary structure; the first section 1311 is vertically connected to the foot roller frame 11 on the surface side of the foot roller 15, the second section 1312 is connected to the nozzle 132, and the second section 1312 is bent at a predetermined angle 4 toward both sides in the corner direction of the narrow surface 3 of the cast slab; the predetermined angle 4 is to ensure that the axial extension lines of the second section 1312 and the nozzle 132 intersect the casting blank narrow surface 3, and the intersection point is located in the direction from the corner of the casting blank narrow surface 3 to the center of the casting blank narrow surface 3 by 0 mm-20 mm.
The spray pipe 131 is arranged into a straight section and a curved section, so that the first spray assembly 13 and the second spray assembly 14 can be bent at a certain angle while having a certain length, and a certain spray cooling area can be ensured by extending from the foot roller frame 11 to the side edge of the foot roller frame 11. After the nozzle 132 is connected with the curved section of the second section 1312, the axial extension lines of the second section 1312 and the nozzle 132 are intersected with the casting blank narrow surface 3, and the intersection point after intersection is located at the direction from the corner of the casting blank narrow surface 3 to the center of the casting blank narrow surface 3 by 0 mm-20 mm, so that the optimal cooling of the corner of the casting blank narrow surface 3 can be ensured.
According to the thickness of the casting blank 3, the preset angle 4 of bending the spray pipe 131 and the distance between the end part of the nozzle 132 and the narrow surface corner part of the casting blank 3, the action width of the cooling water sprayed by the nozzle 132 from the narrow surface inner arc and the outer arc corner part of the casting blank to the central direction of the narrow surface 3 of the casting blank is ensured to be 30 mm-80 mm, and the cooling effect of the narrow surface corner part of the casting blank 3 can be ensured.
As shown in fig. 1 to 3, the cooling water pipe 12 includes a first cooling water passage 121 and a second cooling water passage 122, the first cooling water passage 121 and the second cooling water passage 122 being disposed in the foot roller frame 11 and respectively along the height direction of the foot roller frame 11, the first cooling water passage 121 and the second cooling water passage 122 communicating with each other; the inlet end of the first cooling water channel 121 or the inlet end of the second cooling water channel 122 is connected with a water inlet interface, and the water inlet interface is used for being connected with an external pipeline; the first spray assembly 13 communicates with a first cooling water gallery 121 and the second spray assembly 14 communicates with a second cooling water gallery 122.
In the embodiment provided by the utility model, a stainless steel pipe is connected with two cold main water supply pipelines in two cold water valve stations to form an external pipeline, the external pipeline is paved near a vibration frame of the crystallizer 2 and is divided into 2 paths, the external pipeline is respectively connected with water inlet interfaces at the back sides of foot roller frames 11 of narrow-face foot rollers 1 at two sides of the crystallizer 2 to respectively supply water for the narrow-face foot rollers 1 at two sides of the crystallizer 2, and then a first cooling water channel 121 and a second cooling water channel 122 which are mutually communicated are arranged in the foot roller frames 11 to respectively supply water for a first spray assembly 13 and a second spray assembly 14.
As shown in fig. 1 and 2, an extension frame 5 is connected below the foot roller frame 11, and the cross section of the extension frame 5 is the same as the cross section of the foot roller frame 11; the extension frame 5 is provided therein with a connection pipe 51, and the first cooling water passage 121 and the second cooling water passage 122 are communicated through the connection pipe 51.
Because the external pipeline connected from the two-cooling main water supply pipeline is connected with the water inlet interface on the back surface of the foot roller frame 11, and the first spraying component 13 and the second spraying component 14 are respectively arranged on two sides of the original cooling nozzle 7 of the narrow-surface foot roller, when the foot roller frame 11 is provided with one water inlet interface, the first cooling water channel 121 and the second cooling water channel 122 are required to be communicated so as to supply water for the first spraying component 13 and the second spraying component 14, therefore, the extension frame 5 is connected below the foot roller frame 11, the cross section of the extension frame 5 is identical with the cross section of the foot roller frame 11, and the connection is convenient and the casting roll gap of the vertical bending section is easy to load.
In order to ensure that the first cooling water channel 121 and the second cooling water channel 122 are communicated, two water inlet ports may be provided on the foot roller frame 11, and the external pipeline may be connected with the two water inlet ports respectively, and the specific communication mode is not limited.
As shown in fig. 1, the number of the first spray assemblies 13 is plural, the first spray assemblies 13 are all communicated with the first cooling water channel 121, the number of the second spray assemblies 14 is plural, and the second spray assemblies 14 are all communicated with the second cooling water channel 122; the first spray assemblies 13 are distributed between each adjacent foot roller 15 at intervals along the height direction of the foot roller frame 11, the second spray assemblies 14 are distributed between each adjacent foot roller 15 at intervals along the height direction of the foot roller frame 11, and the vertical height between the spraying end parts of the first spray assemblies 13 and the spraying end parts of the second spray assemblies 14 and the casting blank narrow surface 3 is 40-100 mm.
The number of the first spraying components 13 and the second spraying components 14 are multiple, at least one first spraying component 13 and one second spraying component 14 are arranged between every two adjacent foot rollers 15, the corresponding number of the first spraying components 13 and the corresponding number of the second spraying components 14 are arranged according to the number of the foot rollers 15, and the vertical heights of the spraying end parts of the first spraying components 13 and the spraying end parts of the second spraying components 14 are 40-100 mm away from the narrow surface 3 of the casting blank so as to meet the requirement of spraying and cooling of corners of the narrow surface 3 of the casting blank.
As shown in fig. 1 to 3, the first cooling water passage 121 and the second cooling water passage 122 are disposed in parallel along both sides of the foot roller frame 11, respectively.
The arrangement of the pipelines is easy, and the smooth circulation of the cooling water in the first cooling water channel 121 and the second cooling water channel 122 and the stable water pressure can be ensured.
As shown in fig. 2 and 3, the nozzle 132 is rectangular or conical; when the nozzle 132 is conical, the injection angle 6 of the nozzle 132 is 45-90 degrees; when the nozzle 132 is rectangular, the nozzle 132 is 45 ° to 90 ° in the direction of drawing the blank and perpendicular to the ejection angle 6 of the drawn blank; the action width of the cooling water sprayed by the spray nozzle 132 at the inner arc corner of the casting blank narrow surface 3 and the outer arc corner of the casting blank narrow surface 3 is 30 mm-80 mm from the corresponding corner of the casting blank narrow surface 3 to the center of the casting blank narrow surface 3.
According to the spraying angle 6 when the nozzle 132 is rectangular or conical, the thickness of the casting blank, the preset bending angle 4 of the spray pipe 131 and the distance between the tail end of the nozzle 132 and the corner of the narrow surface 3 of the casting blank, the cooling effect of the corner of the narrow surface 3 of the casting blank is ensured by ensuring that the action width of cooling water sprayed by the nozzle 132 from the corners of the narrow surfaces of the inner arc and the outer arc of the casting blank to the central direction of the casting blank is 30 mm-80 mm.
The specific application of the spray cooling narrow-face foot roller at the casting blank corner of the slab continuous casting machine is described below when the width of the casting blank narrow-face 3 is 250 mm.
The external pipeline is DN50 stainless steel pipe, one end of the external pipeline is connected with the two-cold main water supply pipeline, the other end is connected with the water inlet interface arranged on the foot roller frame 11, and the external pipeline is connected with the stop valve, the pneumatic control valve and the flowmeter flow monitoring unit, so that the water supply capacity of the external pipeline is 400L/min, the external pipeline is paved near the vibration frame of the crystallizer 2, then the external pipeline is divided into two paths, the external pipeline is connected to the water inlet interface arranged on the foot roller frame 11 of the narrow-surface foot roller 1 on two sides of the crystallizer 2 by a metal hose with nominal diameter DN40 and is connected with the water inlet interface, so that the first cooling water channel 121 and the second cooling water channel 122 arranged in the foot roller frame 11 can supply water stably.
The diameters of the first cooling water channel 121 and the second cooling water channel 122 are respectively 32mm, so that the water throughput of each water channel can reach 100L/min. The first cooling water channel 121 and the second cooling water channel 122 are laid from the bottom to the top of the foot roller frame 11, and are respectively communicated with the longitudinal direction of the first cooling water channel 121 and the second cooling water channel 122 along the two sides of the foot roller frame 11 and the distance between the outer wall and the side edge of the foot roller frame 11 is 15mm, the distance between the outer wall and the front end surface of the foot roller frame 11 is 20mm, the height of the extension frame 5 is 70mm, the connecting pipeline 51 with the diameter of 32mm is transversely drilled in the extension frame 5, and the transverse two ends of the connecting pipeline 51 are respectively communicated with the longitudinal direction of the first cooling water channel 121 and the second cooling water channel 122.
The narrow-face foot roller 1 is provided with four foot rollers 15, a first spraying component 13 and a second spraying component 14 are arranged between the foot rollers 15 and below the uppermost foot roller 15 and below the lowermost foot roller 15, and three transverse cooling nozzles are formed by the narrow-face foot roller and the original cooling nozzles 7 of the narrow-face foot roller, and 5 rows are formed.
The inner diameter of the spray pipe 131 is 15mm, and the spray pipe 131 is screwed into the foot roller frame 11 and is respectively communicated with the first cooling water channel 121 and the second cooling water channel 122 to supply water to the spray pipe 131.
After the first section 1311 in the spray pipe 131 is a straight section and is connected with the curved section of the second section 1312, the intersection point of the central axial extension line of the second section 1312 after intersecting the casting blank narrow surface 3 is located at the 8mm position of the corner of the casting blank narrow surface 3 in the central direction of the casting blank narrow surface 3, the total length of the spray pipe 131 is required to ensure that the vertical distance from the tail end of the nozzle 132 connected with the spray pipe to the casting blank narrow surface 3 is 60mm, the nozzle 132 is a conical nozzle, the spraying angle 6 is 68 degrees, the action width of cooling water sprayed by the nozzle 132 in the central direction of the casting blank narrow surface 3 is 40mm, and the good cooling effect of the corner of 250mm in the width of the casting blank narrow surface 3, namely the thickness of the casting blank can be ensured.
The slab casting machine according to the embodiment of the utility model provides a slab casting machine, which comprises the slab casting machine casting blank corner spray cooling narrow-face foot roller according to the embodiment of the utility model, and the slab casting machine casting blank corner spray cooling narrow-face foot roller according to the embodiment of the utility model has the technical effects, so that the slab casting machine according to the embodiment of the utility model also has the corresponding technical effects, namely comprises the narrow-face foot roller 1 connected below a narrow-face outlet 3 of a crystallizer 2, wherein the narrow-face foot roller 1 comprises a foot roller frame 11, a cooling water channel 12, a first spraying assembly 13 and a second spraying assembly 14, the first spraying assembly 13 and the second spraying assembly 14 are connected with the foot roller frame 11 and are arranged between the foot rollers 15, the cooling water channel 12 is arranged in the foot roller frame 11 and is respectively communicated with the first spraying assembly 13 and the second spraying assembly 14, and the cooling water channel 12 is used for providing cooling water for the first spraying assembly 13 and the second spraying assembly 14; the first spraying component 13 and the second spraying component 14 are oppositely arranged and distributed along two sides of the foot roller frame 11 respectively, and the first spraying component 13 and the second spraying component 14 are used for spraying and cooling the corners of the casting blank narrow surface 3.
The construction and operation of the slab caster according to the embodiment of the present utility model are understood and easily accomplished by those skilled in the art, and thus will not be described in detail.
Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the utility model and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. The specification and examples are to be regarded in an illustrative manner only.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.
Claims (8)
1. The narrow-face foot roller (1) is connected to the lower portion of a narrow-face outlet of a crystallizer (2), the narrow-face foot roller (1) comprises a foot roller frame (11), a cooling water channel (12), a first spraying component (13) and a second spraying component (14), the first spraying component (13) and the second spraying component (14) are connected with the foot roller frame (11) and are arranged between foot rollers (15), the cooling water channel (12) is arranged in the foot roller frame (11) and is respectively communicated with the first spraying component (13) and the second spraying component (14), and the cooling water channel (12) is used for providing cooling water for the first spraying component (13) and the second spraying component (14);
the first spraying assembly (13) and the second spraying assembly (14) are oppositely arranged and distributed along two sides of the foot roller frame (11) respectively, and the first spraying assembly (13) and the second spraying assembly (14) are both used for spraying and cooling the corners of the casting blank narrow surface (3);
the first spraying assembly (13) and the second spraying assembly (14) are symmetrically arranged relative to the width center line of the foot roller frame (11), the first spraying assembly (13) and the second spraying assembly (14) comprise spraying pipes (131) and nozzles (132), one ends of the spraying pipes (131) are connected with the nozzles (132), and the other ends of the spraying pipes (131) are connected with the foot roller frame (11) and are communicated with the cooling water channel (12);
the nozzle (132) is rectangular or conical;
when the nozzle (132) is conical, the injection angle (6) of the nozzle (132) is 45-90 degrees;
when the nozzle (132) is rectangular, the nozzle (132) is 45-90 degrees along the direction of drawing the blank and the injection angle (6) perpendicular to the direction of drawing the blank;
the action widths of the cooling water sprayed by the spray nozzle (132) at the inner arc corner of the casting blank narrow surface (3) and the outer arc corner of the casting blank narrow surface (3) are 30-mm-80 mm from the corresponding corner of the casting blank narrow surface (3) to the central direction of the casting blank narrow surface (3).
2. The cold narrow-face foot roller for spraying and cooling the casting blank corner of the slab caster according to claim 1, wherein a water inlet port of the cooling water channel (12) is arranged on the back face of the foot roller frame (11), the water inlet port is connected with an external pipeline connected with the outlet end of a two-cold main water supply pipeline, and a stop valve, a pneumatic regulating valve and a flowmeter flow monitoring unit are connected on the external pipeline;
the flow monitoring unit of the flowmeter is used for detecting the water supply quantity of the external pipeline and controlling the water supply quantity of the external pipeline to be matched with the blank drawing speed so as to enable the corner of the narrow surface (3) of the casting blank to be cooled in an intensified manner.
3. The slab caster casting billet corner spray-cooling narrow-face foot roll according to claim 1, wherein the spray pipe (131) comprises a first section (1311) and a second section (1312), the first section (1311) being a straight section, the second section (1312) being a curved section, the first section (1311) and the second section (1312) being connected as a unitary structure;
the first section (1311) is vertically connected with the foot roller frame (11) on the surface side of the foot roller (15), the second section (1312) is connected with the nozzle (132), and the second section (1312) is bent to form a preset angle (4) towards two sides of the corner direction of the casting blank narrow surface (3);
the preset angle (4) is used for ensuring that the axial extension lines of the second section (1312) and the nozzle (132) are intersected with the casting blank narrow surface (3), and the intersection point is positioned from the corner of the casting blank narrow surface (3) to the central direction 0 mm-20 mm of the casting blank narrow surface (3).
4. The slab caster casting slab corner spray cooling narrow face foot roll according to claim 2, wherein the cooling water channel (12) comprises a first cooling water channel (121) and a second cooling water channel (122), the first cooling water channel (121) and the second cooling water channel (122) are both arranged in the foot roll frame (11) and respectively arranged along the height direction of the foot roll frame (11), and the first cooling water channel (121) and the second cooling water channel (122) are mutually communicated;
the inlet end of the first cooling water channel (121) or the inlet end of the second cooling water channel (122) is connected with the water inlet interface, and the water inlet interface is used for being connected with the external pipeline;
the first spray assembly (13) is communicated with the first cooling water channel (121), and the second spray assembly (14) is communicated with the second cooling water channel (122).
5. The slab caster casting blank corner spray cooling narrow face foot roll according to claim 4, characterized in that an extension frame (5) is connected below the foot roll frame (11), the cross section of the extension frame (5) is the same as the cross section of the foot roll frame (11);
a connecting pipeline (51) is arranged in the extension frame (5), and the first cooling water channel (121) and the second cooling water channel (122) are communicated through the connecting pipeline (51).
6. The slab caster casting billet corner spray cooling narrow-face foot roll according to claim 4, wherein the number of the first spray assemblies (13) is plural, the plurality of the first spray assemblies (13) are all communicated with the first cooling water passage (121), the number of the second spray assemblies (14) is plural, and the plurality of the second spray assemblies (14) are all communicated with the second cooling water passage (122);
the first spraying assemblies (13) are distributed between each two adjacent foot rollers (15) at intervals along the height direction of the foot roller frame (11), and the second spraying assemblies (14) are distributed between each two adjacent foot rollers (15) at intervals along the height direction of the foot roller frame (11);
the vertical heights of the spraying end parts of the first spraying assemblies (13) and the spraying end parts of the second spraying assemblies (14) from the casting blank narrow surface (3) are 40 mm-100 mm.
7. The slab caster casting slab corner spray cooling narrow face foot roll of claim 4, wherein said first cooling water channel (121) and said second cooling water channel (122) are disposed in parallel along both sides of said foot roll frame (11), respectively.
8. A slab caster comprising the slab caster casting slab corner spray cooling narrow face foot roll of any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210328451.2A CN114682747B (en) | 2022-03-31 | 2022-03-31 | Slab caster casting blank corner spray cooling narrow-face foot roller and slab caster |
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| CN202210328451.2A CN114682747B (en) | 2022-03-31 | 2022-03-31 | Slab caster casting blank corner spray cooling narrow-face foot roller and slab caster |
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