CN110961616A - Steel ladle rotational flow generating device - Google Patents
Steel ladle rotational flow generating device Download PDFInfo
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- CN110961616A CN110961616A CN202010088070.2A CN202010088070A CN110961616A CN 110961616 A CN110961616 A CN 110961616A CN 202010088070 A CN202010088070 A CN 202010088070A CN 110961616 A CN110961616 A CN 110961616A
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- lower nozzle
- ladle
- nozzle
- molten steel
- generating device
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention relates to a ladle rotational flow generating device, which comprises a lower nozzle, wherein the lower nozzle is in a circular truncated cone shape, the inclination angle of the lower nozzle is α, a lower nozzle middle hole is arranged in the lower nozzle middle hole to form a molten steel flowing channel, the lower nozzle middle hole is in a circular truncated cone shape, the inclination angle of the lower nozzle middle hole is α, a plurality of guide grooves are distributed on the inner side wall of the lower nozzle, and the plurality of guide grooves in the shape of a conical spiral line are used for guiding molten steel to generate clockwise or anticlockwise rotational flow around an axis in the lower nozzle and continuously flow into a ladle long nozzle.
Description
Technical Field
The invention relates to the technical field of molten steel continuous casting in the metallurgical industry, in particular to a steel ladle rotational flow generating device.
Background
With the rapid development of steel smelting process and technology and the continuous improvement of quality requirements on steel products, the optimization of the high-efficiency continuous casting production process of steel is more and more emphasized. In the process of continuous casting of steel, molten steel enters a tundish through a ladle long nozzle, flows into a crystallizer through a submerged nozzle of the tundish, and is cooled and solidified in the crystallizer to form a casting blank. The ladle sliding gate serves as a key device for controlling flow in the continuous casting process, is used for adjusting the flow of molten steel from a ladle to a tundish, and obviously improves the controllability in the continuous casting process.
In the actual continuous casting production process, the liquid level in the steel ladle is 5-6 m, so that the impact force of the molten steel entering the tundish through the long nozzle is very large, the fluctuation of the liquid level of the tundish is easily caused to generate molten steel plume, and the molten steel is subjected to secondary oxidation. Meanwhile, the inclusion exists in the molten steel, and when the molten steel flows through the long nozzle of the ladle, the inclusion is easy to deposit on the surface of the refractory material of the long nozzle, so that nozzle nodulation is generated, and the service life of the long nozzle is further influenced.
At present, the method for generating rotational flow in the long nozzle of the ladle is an effective method for maintaining the liquid level in the tundish stable and improving the motion state of inclusions. The method can obviously avoid the secondary oxidation of molten steel in the tundish, relieve the nozzle nodulation and blockage and prolong the service life of the nozzle. Various methods are used for generating rotational flow in the long nozzle, such as adding a guide vane in the long nozzle, arranging an electromagnetic induction device and the like. However, the guide vane is easy to be damaged, and the short plate of the service life of the vane is obvious. The electromagnetic induction device needs to continuously consume electric energy, and the equipment cost is greatly increased.
Disclosure of Invention
Aiming at the problems in the prior art, the technical problem to be solved by the invention is to provide a ladle rotational flow generating device which is more beneficial to generating rotational flow in a long nozzle.
In order to solve the technical problems, the invention adopts the following technical scheme:
a steel ladle rotational flow generating device comprises a lower nozzle, wherein the lower nozzle is in a circular truncated cone shape, the inclination angle of the circular truncated cone is α, a lower nozzle middle hole is formed in the lower nozzle middle hole to form a molten steel flowing channel, the lower nozzle middle hole is in a circular truncated cone shape, the inclination angle is α, the lower nozzle is arranged in a circular truncated cone shape and can be tightly connected with the upper end of a long nozzle connected with the lower nozzle due to the fact that the lower nozzle is matched with the upper portion of the long nozzle, the phenomenon that a large amount of air caused by flowing of molten steel is sucked from a joint between the steel ladle lower nozzle and the long nozzle to cause failure of protection pouring is avoided, the turbulence intensity of the molten steel can be improved to a certain degree through the inner inclined circular truncated cone-shaped lower nozzle middle hole, bubbles blown in an argon blowing process can be broken to be facilitated to strengthen argon blowing effect, in addition, the molten steel can be guided.
Preferably, each flow guide groove is in the shape of a conical helix, the pitch and the height of the conical helix are consistent with the height of the drainage port, the included angle between the generatrix of the conical helix and the central axis of the conical helix is α, the conical helix flow guide groove which is arranged according to the parameters can be matched with the circular truncated cone-shaped drainage port with the inclination angle of α and the middle hole in the circular truncated cone-shaped drainage port, the matching degree of structural combination is high, the phenomenon that the flowing state of molten steel is damaged due to unreasonable structures is avoided, the pitch and the height of the conical helix are consistent with the height of the drainage port, the flow guide groove can be used for guiding once the molten steel enters the middle hole of the drainage port, the flowing state of the molten steel is changed, and the rotary flowing of the molten steel in the middle hole is further.
Preferably, the α is in a range of 10 degrees to α degrees to 15 degrees, on one hand, if α degrees is too small, the inclination degree is not obvious, the flowing change amplitude of the molten steel after entering the down nozzle is not large, the effects of enhancing turbulent flow and guiding the molten steel to generate rotational flow primarily cannot be achieved, and if α degrees is too large, the area of the outlet of the down nozzle is obviously reduced, so that the flowing of the molten steel is blocked, and on the other hand, considering that the down nozzle is connected with the long nozzle, the preferable range is determined to be 10 degrees to α degrees to 15 degrees after referring to the structure of the upper part of the long nozzle (the general inclination angle is 15 degrees) in industrial application.
Preferably, the plurality of guide grooves are distributed in an axisymmetrical manner by taking a central axis of the lower nozzle as an axis. In order to obtain a uniformly rotating flow field, it is necessary to ensure that molten steel flowing into the lower nozzle from all positions can be guided by the guide grooves, and therefore the guide grooves are symmetrically distributed by taking the central axis of the lower nozzle as an axis.
Preferably, the interval angle of two adjacent guide grooves in the circumferential direction of the lower nozzle is β, β is more than or equal to 45 degrees and less than or equal to 90 degrees, the number of the guide grooves corresponding to the angle range is 4 to 8, the section of each guide groove is not too large due to the limitation of the size of the section of the hole in the lower nozzle, otherwise, the molten steel flow area at the outlet of the lower nozzle is reduced, when the number of the guide grooves is less than 4, the central part of the lower nozzle is difficult to generate rotational flow, and when the number of the guide grooves is more than 8, the flow area is obviously reduced due to the intensive distribution of the molten steel, the distance between the guide grooves is narrowed, and blockage is easily generated due to sediment deposition.
Compared with the prior art, the invention has at least the following advantages:
1. the invention provides a ladle rotational flow generating device, wherein a plurality of spiral guide grooves are arranged on the inner wall of the ladle rotational flow generating device to guide molten steel to generate clockwise or anticlockwise rotational flow around an axis in a lower nozzle and continuously flow into a ladle long nozzle.
2. The diversion trench can guide molten steel to pass through the lower nozzle to rotate to enter the long nozzle, so that the movement path of inclusions in the molten steel is changed, and in the rotating process, as the density of the inclusions in the molten steel is lower than that of the molten steel, the inclusions can be gathered towards the central position of the long nozzle of a steel ladle under the action of centrifugal force, the probability of mutual collision among the inclusions is remarkably improved, the floating efficiency of the inclusions after entering the tundish is improved, the problem of nodulation and blockage caused by the deposition of the inclusions on the wall surface of the long nozzle can be solved, and the service life of the long nozzle is prolonged. Meanwhile, the molten steel rotates to enter the tundish, so that the impact of the molten steel entering the tundish can be weakened, secondary oxidation caused by overlarge fluctuation of the liquid level of the molten steel can be avoided, and the purity of the molten steel is improved. In addition, in the argon blowing process of the steel ladle, the strong turbulence generated by the rotating molten steel can break the blown argon bubbles and strengthen the capturing and adsorbing effects of the bubbles on the inclusions.
3. The invention provides a ladle rotational flow generating device, which is prepared by a casting forming method by arranging a plurality of conical spiral linear guide grooves with the height equal to a water gap to guide the flow of molten steel so as to generate rotational flow. And because the height of the lower nozzle is about 100mm generally, and the size of the die is similar to that of the lower nozzle, the difficulty of die processing and nozzle preparation is low. Compared with the method of adding guide vanes and arranging an electromagnetic induction device, the ladle rotational flow generating device provided by the invention has the advantages of simple structure, low preparation difficulty, easiness in maintenance and replacement and capability of efficiently generating rotational flow of molten steel in a long nozzle.
Drawings
FIG. 1 is a schematic structural section view of the ladle swirling flow generating device of the present invention assembled with a prior art.
Fig. 2 is another structural section schematic diagram after the ladle rotational flow generating device is assembled with the prior art.
Fig. 3 is a top view of the ladle swirling flow generating device of the present invention.
Fig. 4 is a schematic sectional view taken along line a-a of fig. 3.
In the figure: 1-upper nozzle, 2-upper sliding plate, 3-lower sliding plate, 4-lower nozzle, 5-diversion trench, 6-ladle, 7-upper nozzle mesopore, and 8-lower nozzle mesopore.
Detailed Description
The present invention is described in further detail below.
The steel ladle rotational flow generating device provided by the invention is mainly applied to a sliding water gap device, and the sliding water gap device is necessary equipment in steelmaking production and has the function of adjusting the flow of molten steel by the molten steel in a steel ladle through the size of the sliding water gap. The sliding gate valve device belongs to the prior art, and in order to facilitate understanding of the structure of the invention, the following explanation is made in combination with the existing sliding gate valve device:
referring to fig. 1 and 2, the sliding gate valve assembly generally includes an upper gate 1, an upper slide 2 fixedly connected to the bottom of the upper gate 1, a lower slide 3 connected to the upper slide 2, and a lower gate 4 connected to the lower slide, the upper gate 1 being fixed to the bottom of a ladle 6, and the bottom surface of the upper gate being flush with the bottom lower surface of the ladle 6. The optimal shape of the water feeding port 1 is a cylinder, and the inner part of the water feeding port is hollow to form a first middle hole 7 in the vertical direction. The upper nozzle 1 is connected with the upper sliding plate 2, the joint is engaged and connected by adopting an inclined surface, the lower sliding plate 3 is arranged below the upper sliding plate 2, and the lower sliding plate 3 can reciprocate along the horizontal direction, so that the flow of molten steel is controlled. The middle parts of the upper sliding plate 2 and the lower sliding plate 3 are respectively provided with an inner hole which penetrates in the vertical direction and is communicated with an upper water gap middle hole 7 of the upper water gap 1.
The upper nozzle 1, the upper sliding plate 2, the lower sliding plate 3 and the lower nozzle 4 are made of refractory materials, and middle holes penetrating in the vertical direction are formed in the inner parts of the upper nozzle, the upper sliding plate, the lower sliding plate and the lower nozzle to form a molten steel flowing channel. The upper nozzle 1 is positioned at the bottom of the ladle and fixed by a nozzle brick cup, and the upper sliding plate 2, the lower sliding plate 3 and the lower nozzle 4 are all fixed on the bottom surface of the outer part of the ladle by a sliding plate motion mechanism (the sliding plate motion mechanism also belongs to the prior art, and the details are not described here, and the prior art can refer to a CN104959590A ladle sliding nozzle mechanism or a CN201432095Y ladle sliding nozzle mechanism). The lower sliding plate 3 and the lower water gap 4 are connected but not fixed and can reciprocate in the horizontal direction to control the flow of molten steel.
Referring to fig. 2, the improvement of the invention in fig. 3 and 4 lies in the change of the structure of the down nozzle, specifically, the down nozzle 4 is integrally in a circular truncated cone shape, the inclination angle α is 10 to 15 degrees, when the invention is specifically implemented, α can be 10 degrees, 11 degrees, 12 degrees, 13 degrees, 14 degrees or 15 degrees, a down nozzle middle hole 8 is arranged in the down nozzle 4, the down nozzle middle hole 8 is in a circular truncated cone shape, the inclination angle is α, the down nozzle middle hole 8 is communicated with an upper nozzle middle hole 7, an inner hole in the middle of an upper sliding plate 2 and a lower sliding plate 3 to form a molten steel channel in the vertical direction, when the invention is used, the upper aperture of the down nozzle middle hole 8 is consistent with the inner hole aperture of the lower sliding plate 3, and the lower aperture of the.
Referring to fig. 3 and 4, a plurality of flow guide grooves 5 are distributed on the inner wall of the lower nozzle 4, each flow guide groove 5 is in a conical spiral shape, the height and pitch of the conical spiral line of each flow guide groove in the conical spiral shape are consistent with the height of the lower nozzle 4, the flow guide grooves 5 are distributed in an axisymmetrical manner on the central axis of the lower nozzle 4, the interval angle β between every two adjacent flow guide grooves 5 in the circumferential direction of the lower nozzle 4 is 45-90 degrees, the number of the flow guide grooves corresponding to the angle range is 4-8, namely, at least four spiral flow guide grooves are provided, in specific implementation, the number of the flow guide grooves can be 4, 5, 6, 7 or 8, molten steel vertically flows to the lower nozzle 4 through the upper nozzle 1, the upper sliding plate 2 and the lower sliding plate 3, flows into the spiral flow guide grooves 5 in the lower nozzle 4, the spiral flow guide the molten steel into the lower nozzle 4, the movement trend of the spiral flow guide grooves 5 is changed, the molten steel can realize rotary flow around the central axis in the lower nozzle 4, the molten steel enters the long nozzle in a rotating flow state, the spiral flow guide groove 5, the molten steel inclusion density in the lower nozzle is lower nozzle, the molten steel is lower than the molten steel, the molten steel density of the molten steel is reduced, the molten steel.
After the molten steel enters the tundish through the rotation of the long nozzle, the impact depth of the molten steel entering the tundish can be reduced, and secondary oxidation caused by fluctuation of the liquid level of the molten steel in the tundish is prevented. In addition, in the argon blowing process of the ladle, the blown bubbles can be broken up by the strong turbulence generated by rotation, the collision probability of the bubbles and the inclusions is increased, and the capturing and the adsorption of the bubbles to the inclusions are facilitated.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (6)
1. A ladle rotational flow generating device comprises a lower nozzle (4), and is characterized in that the lower nozzle (4) is in a circular truncated cone shape, the inclination angle is α, and a lower nozzle central hole (8) is arranged inside the lower nozzle to form a molten steel flowing channel;
the central hole (8) of the lower nozzle is in a circular truncated cone shape, and the inclination angle is α;
and a plurality of flow guide grooves (5) are distributed on the inner side wall of the lower water gap (4).
2. The ladle swirling flow generating apparatus as claimed in claim 1, wherein: each diversion trench (5) is in the shape of a conical helix, and the pitch and the height of the conical helix are consistent with the height of the drainage port (4).
3. The ladle cyclone generating device as claimed in claim 1 or 2, wherein the included angle between the generatrix of the conical helix and the central axis thereof is α.
4. The ladle swirl flow generating device of claim 3, wherein the α is in the range of 10- α -15 °.
5. The ladle swirl flow generating device according to claim 4, wherein: the guide grooves (5) are distributed in an axisymmetric manner on the central axis of the lower water gap (4).
6. The ladle swirl flow generating device of claim 5, wherein the interval angle between two adjacent guide grooves (5) in the circumferential direction of the lower nozzle (4) is β, and is more than or equal to 45 degrees and less than or equal to β degrees and less than or equal to 90 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010088070.2A CN110961616A (en) | 2020-02-12 | 2020-02-12 | Steel ladle rotational flow generating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010088070.2A CN110961616A (en) | 2020-02-12 | 2020-02-12 | Steel ladle rotational flow generating device |
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| Publication Number | Publication Date |
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| CN110961616A true CN110961616A (en) | 2020-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010088070.2A Pending CN110961616A (en) | 2020-02-12 | 2020-02-12 | Steel ladle rotational flow generating device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113231629A (en) * | 2021-05-14 | 2021-08-10 | 东北大学 | Molten steel rotating device and method in tundish |
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2020
- 2020-02-12 CN CN202010088070.2A patent/CN110961616A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113231629A (en) * | 2021-05-14 | 2021-08-10 | 东北大学 | Molten steel rotating device and method in tundish |
| CN113231629B (en) * | 2021-05-14 | 2022-04-08 | 东北大学 | Molten steel rotating device and method in tundish |
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