CN210305680U - Continuous casting round billet elliptical crystallizer - Google Patents
Continuous casting round billet elliptical crystallizer Download PDFInfo
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- CN210305680U CN210305680U CN201920750655.9U CN201920750655U CN210305680U CN 210305680 U CN210305680 U CN 210305680U CN 201920750655 U CN201920750655 U CN 201920750655U CN 210305680 U CN210305680 U CN 210305680U
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Abstract
The utility model relates to an oval crystallizer of continuous casting round billet belongs to the metal continuous casting field. The copper pipe and the back plate are provided with a water gap; along the casting direction, the copper pipe and the back plate are divided into an upper section and a lower section, wherein the transverse section of the upper section is oval, and the transverse section of the lower section is round; the area of the inner cavity of the copper pipe is gradually reduced from the inlet to the outlet, the wall thickness of the copper pipe is sequentially thinned, the width of a water gap between the copper pipe and the back plate is sequentially widened, and the surface of the inner cavity of the copper pipe is a plane or a curved surface. The crystallizer can stably feed liquid molten steel into the inlet of the oval copper pipe by increasing the area of the inlet of the inner cavity, so that the problem of liquid fluctuation in the crystallizer is solved; the heat transfer of upper molten steel is reduced by increasing the thickness of the upper part of the copper pipe, and the shaping of an upper primary blank shell is increased, so that the risk of casting blank surface defects caused by large change of an inner cavity of the oval crystallizer along the casting direction is reduced.
Description
Technical Field
The utility model belongs to the metal continuous casting field, concretely relates to oval crystallizer of continuous casting round billet.
Background
In recent years, with the upgrading of the industry of the steel industry in China, the national requirements on energy conservation, consumption reduction and environmental protection are increased year by year, and the high efficiency of continuous casting (namely, the increase of the drawing speed) becomes one of the key development directions in the field of continuous casting. However, as the continuous casting speed increases, the fluctuation of the liquid level of the crystallizer increases, and particularly, in a continuous casting machine with a small cross section, such as a small square billet (a square billet with a cross section of less than 200mm x 200 mm) and a small round billet (a round billet with a cross section diameter of less than 200 mm), the slag entrapment in the crystallizer can be serious, and inclusions are solidified in a casting blank due to the difficulty in floating in the crystallizer, thereby causing the quality defect of the casting blank and causing the steel leakage accident seriously.
In order to solve the problem of large fluctuation of the liquid level of the crystallizer, an electromagnetic flow control method for slowing the fluctuation of the liquid level of the crystallizer (patent number: 201310407936.1) discloses a relevant content of 'restraining the fluctuation of the liquid level of the crystallizer by adding an electromagnetic device to generate a spiral electromagnetic field'; in the structure of a continuous casting machine with the function of eliminating the fluctuation of the liquid level of the crystallizer (patent number: 201020280089.9), a method for improving the fluctuation of the liquid level of the crystallizer by adjusting the layout of a roller row of the continuous casting machine is provided; in a continuous casting mold device (patent No. 200710047480.7) in which a flow field and fluctuation of a liquid surface can be controlled, there is proposed a method of improving fluctuation of the liquid surface by controlling the flow field in the mold by a technique of feeding a wire into the mold.
In the method, the electromagnetic braking mode is a scheme for better controlling the fluctuation of the liquid level of the crystallizer, but the scheme has larger investment and has long-term operation cost; the disadvantage of the wire feeding scheme is the same as the electromagnetic braking mode, namely the cost is increased; although the adjustment roller row can realize the suppression of the liquid level fluctuation of the crystallizer in a new project, the implementation of a reconstruction project is difficult, and the reconstruction cost is increased.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides an elliptical crystallizer for continuous casting round billets, which can improve the problem caused by the fluctuation of the liquid level of the crystallizer during the continuous casting at high casting speed by adjusting the form of the crystallizer.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a continuous casting round billet elliptical crystallizer comprises a copper pipe and a back plate sleeved outside the copper pipe, wherein a water gap is reserved between the copper pipe and the back plate; along the casting direction, the copper pipe and the back plate are divided into an upper section and a lower section, wherein the transverse section of the upper section is oval, the transverse section of the lower section is round, the upper section and the lower section are in smooth transition, the upper section of the copper pipe is arranged corresponding to the upper section of the back plate, and the lower section of the copper pipe is arranged corresponding to the lower section of the back plate; the area of the inner cavity of the copper pipe is gradually reduced from the inlet to the outlet, the wall thickness of the copper pipe is sequentially thinned, the width of a water gap between the copper pipe and the back plate is sequentially widened, and the surface of the inner cavity of the copper pipe is a plane or a curved surface.
Further, the size of the copper pipe satisfies the following requirements: (1) s is more than or equal to 1.05i/So≤4，(2)1.04≤Ci/Co≤3；
Wherein S isiIs the area of the inner cavity of the copper tube inlet, SoIs the area of the inner cavity of the copper tube outlet, CiInner cavity perimeter of copper tube inlet, CoIs the perimeter of the inner cavity of the copper pipe outlet.
Furthermore, the diameter of the inner cavity of the copper pipe outlet is less than or equal to 200 mm.
Furthermore, the wall thickness of the inlet of the copper pipe is between 30mm and 10mm, and the wall thickness of the outlet of the copper pipe is between 20mm and 5 mm.
Further, the water gap is divided into an upper section and a lower section, wherein the transverse section of the upper section is in an elliptical ring shape, and the transverse section of the lower section is in a circular ring shape; the width of the water gap satisfies that Ti-To is more than or equal To 1mm and less than or equal To 20 mm; wherein Ti is the width of the water gap corresponding To the outlet of the copper pipe, and To is the width of the water gap corresponding To the inlet of the copper pipe.
Furthermore, the distance between the inlet and the outlet of the copper pipe is L, and L is more than or equal to 900mm and less than or equal to 2000 mm.
Furthermore, the inner cavity wall surface of the copper pipe is in a multi-section linear curved surface form, a section of linear plane form or a parabolic curved surface form from the inlet to the outlet.
The beneficial effects of the utility model reside in that:
the crystallizer can stably feed liquid molten steel into the inlet of the oval copper pipe by increasing the area of the inlet of the inner cavity, so that the problem of liquid fluctuation in the crystallizer is solved; the heat transfer of upper molten steel is reduced and the shaping of an upper primary blank shell is increased by increasing the thickness of the upper part of the copper pipe, so that the risk of casting blank surface defects caused by large change of an oval crystallizer inner cavity along the casting direction is reduced; the scheme has the advantages of simple structure, convenient manufacture, low cost and convenient popularization.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of a crystallizer according to the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a view taken along line K of FIG. 2;
FIG. 4 is a schematic view showing the shape of the wall surface of the inner cavity of the copper tube;
fig. 5 is a plan view of the crystallizer of the present invention.
Reference numerals: the device comprises an inlet-1, a copper pipe-2, a water seam-3, a back plate-4, an outlet-5, a multi-section linear curved surface form-201, a one-section linear plane form-202 and a parabolic curved surface form-203.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
Referring to fig. 1 to 5, an elliptical crystallizer for continuous casting round billets comprises a copper tube 2 and a back plate 4 sleeved outside the copper tube 2, wherein a water gap 3 is reserved between the copper tube 2 and the back plate 4; along the casting direction, the copper pipe 2 and the back plate 4 are divided into an upper section and a lower section, wherein the transverse section of the upper section is oval (see figure 5), the transverse section of the lower section is round, the upper section and the lower section are in smooth transition, the upper section of the copper pipe is arranged corresponding to the upper section of the back plate, and the lower section of the copper pipe is arranged corresponding to the lower section of the back plate; the area of the inner cavity of the copper pipe is gradually reduced from the inlet 1 to the outlet 5, the wall thickness of the copper pipe 2 is sequentially thinned along the casting direction, the width of a water gap between the copper pipe and the back plate is sequentially widened along the casting direction, and the surface of the inner cavity of the copper pipe is a plane or a curved surface.
The crystallizer adjusts the transverse cross section shape of the inner cavity at the upper opening of the copper pipe into an oval shape through segmentation, so that the area of the inlet of the inner cavity is far larger than that of the outlet of the inner cavity, the purpose of increasing the area of the upper opening of the inner cavity of the crystallizer is achieved, and the lower section still keeps a round state, so that a round casting blank is obtained. The arrangement can stabilize the liquid molten steel entering the elliptical crystallizer, thereby improving the problem of large liquid level fluctuation in the crystallizer.
The crystallizer can reduce the cooling intensity of the upper part of the copper pipe by increasing the wall thickness of the upper part of the copper pipe and simultaneously controlling the width of a water gap, thereby reducing the heat transfer of molten steel on the upper part, further increasing the shaping of an upper primary blank shell, and reducing the risk of casting blank surface defects caused by large change of an oval crystallizer inner cavity (namely the inner cavity of the copper pipe) along the casting direction.
Preferably, the copper tube size satisfies: (1) s is more than or equal to 1.05i/So≤4，(2)1.04≤Ci/CoLess than or equal to 3; wherein S isiIs the area of the inner cavity of the copper tube inlet, SoIs the area of the inner cavity of the copper tube outlet, CiInner cavity perimeter of copper tube inlet, CoIs the perimeter of the inner cavity of the copper pipe outlet. Under the condition, the liquid level fluctuation in the copper pipe and the molding of the blank shell can achieve the optimal matching.
As a further optimization of the scheme, the diameter of the inner cavity of the copper pipe outlet 5 is less than or equal to 200 mm. The wall thickness of the copper pipe inlet 1 is between 30mm and 10mm, and the wall thickness of the copper pipe outlet is between 20mm and 5 mm.
Because the transverse cross section of the upper section of the copper pipe 2 and the back plate 4 is oval, and the transverse cross section of the lower section is round, the water gap 3 between the copper pipe 2 and the back plate 4 is also divided into an upper section and a lower section, wherein the transverse cross section of the water gap of the upper section is oval ring-shaped, and the transverse cross section of the water gap of the lower section is circular ring-shaped; the width of the water gap satisfies that Ti-To is more than or equal To 1mm and less than or equal To 20 mm; wherein Ti is the width of the water gap corresponding To the outlet of the copper pipe, and To is the width of the water gap corresponding To the inlet of the copper pipe.
The distance between the inlet and the outlet of the copper pipe is L, and L is more than or equal to 900mm and less than or equal to 2000 mm.
Under the setting of the specification, the drawing speed of the round billet is controlled to be more than or equal to 5m/min and less than or equal to Vc and less than or equal to 10 m/min.
As a further optimization of the scheme, the wall surface of the inner cavity of the copper pipe from the inlet to the outlet can be in a multi-section linear curved surface form 201, or a section of linear plane form 202, or a parabolic curved surface form 203. The method can be selected according to actual conditions so as to reduce air gap thermal resistance between the outer surface of the blank shell and the inner wall surface of the copper pipe.
Take a specific structure of a certain crystallizer as an example:
the elliptical crystallizer is characterized in that: an inlet of the oval copper pipe inner cavity and an outlet of the round copper pipe inner cavity; a back plate with an oval upper section and a circular lower section and a water seam; the copper pipe, the water gap and the back plate are arranged in sequence from inside to outside. Along the casting direction of the round billet, an inlet of an oval copper pipe inner cavity is positioned at the upper end, and an outlet of a round copper pipe inner cavity is positioned at the lower end; the area of the inlet (transverse cross section) of the oval copper pipe inner cavity is far larger than that of the outlet (transverse cross section) of the circular copper pipe inner cavity. The wall thickness of the copper pipe becomes thinner along the casting direction in sequence, the width of the water gap 3 becomes wider along the casting direction in sequence, and the wall surface of the inner cavity of the copper pipe can be a plane or a curved surface along the casting direction. By the scheme, the aims of reducing the fluctuation of the liquid level of the crystallizer, improving the continuous casting pulling speed and improving the quality of the casting blank can be achieved.
In the crystallizer, the diameter Ro of an outlet of a circular copper pipe inner cavity is 160 mm. The semimajor axis Ri2 of the inlet of the oval copper tube cavity is 200mm, the semiminor axis Ri1 is 120mm, and the area SiIs 75360mm2(ii) a Perimeter of the inlet Ci1036.2 mm; area S of circular copper pipe inner cavity outletoIs 20096mm2Outlet perimeter CoAnd 502.4 mm. Si/So＝75360/20096＝3.75；Ci/Co1004.8/502.4-2.06. The distance L between the inlet and the outlet of the copper pipe is 1500 mm.
Correspondingly, the wall thickness of the inlet of the oval copper pipe inner cavity is 15mm, the wall thickness of the outlet of the round copper pipe inner cavity is 10mm, and the wall thickness is gradually thinned from the inlet to the outlet along the casting direction. And the elliptical water gap inlet width To is 5mm, the circular water gap outlet width Ti is 10mm, and Ti-To is 5 mm. The drawing speed Vc of the continuous casting round billet is preferably 7 m/min.
The crystallizer can stably feed liquid molten steel into the inlet of the oval copper pipe by increasing the area of the inlet of the inner cavity, so that the problem of liquid fluctuation in the crystallizer is solved; the thickness of the upper part of the copper pipe is increased, the heat transfer of upper molten steel is reduced, and the shaping of an upper primary blank shell is increased, so that the risk of casting blank surface defects caused by large change of an oval crystallizer inner cavity along the casting direction is reduced; the scheme has the advantages of simple structure, convenient manufacture, low cost and convenient popularization.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and 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, and all of them should be covered by the scope of the claims of the present invention.
Claims (7)
1. A continuous casting round billet elliptical crystallizer comprises a copper pipe and a back plate sleeved outside the copper pipe, wherein a water gap is reserved between the copper pipe and the back plate; the method is characterized in that: along the casting direction, the copper pipe and the back plate are divided into an upper section and a lower section, wherein the transverse section of the upper section is oval, the transverse section of the lower section is round, the upper section and the lower section are in smooth transition, the upper section of the copper pipe is arranged corresponding to the upper section of the back plate, and the lower section of the copper pipe is arranged corresponding to the lower section of the back plate; the area of the inner cavity of the copper pipe is gradually reduced from the inlet to the outlet, the wall thickness of the copper pipe is sequentially thinned, the width of a water gap between the copper pipe and the back plate is sequentially widened, and the surface of the inner cavity of the copper pipe is a plane or a curved surface.
2. The continuous casting round billet elliptical crystallizer of claim 1, characterized in that: the size of the copper pipe meets the following requirements: (1) s is more than or equal to 1.05i/So≤4，（2）1.04≤Ci/Co≤3；
Wherein S isiIs the area of the inner cavity of the copper tube inlet, SoIs the area of the inner cavity of the copper tube outlet, CiInner cavity perimeter of copper tube inlet, CoIs the perimeter of the inner cavity of the copper pipe outlet.
3. The continuous casting round billet elliptical crystallizer of claim 2, characterized in that: the diameter of the inner cavity of the copper pipe outlet is less than or equal to 200 mm.
4. The continuous casting round billet elliptical crystallizer of claim 3, characterized in that: the wall thickness of the copper pipe inlet is 30 mm-10 mm, and the wall thickness of the copper pipe outlet is 20 mm-5 mm.
5. The continuous casting round billet elliptical crystallizer of claim 4, characterized in that: the water seam is divided into an upper section and a lower section, wherein the transverse section of the upper section is elliptical ring-shaped, and the transverse section of the lower section is circular ring-shaped; the width of the water gap satisfies that Ti-To is more than or equal To 1mm and less than or equal To 20 mm; wherein Ti is the width of the water gap corresponding To the outlet of the copper pipe, and To is the width of the water gap corresponding To the inlet of the copper pipe.
6. The continuous casting round billet elliptical crystallizer of any one of claims 3 to 5, characterized in that: the distance between the inlet and the outlet of the copper pipe is L, and L is more than or equal to 900mm and less than or equal to 2000 mm.
7. The continuous casting round billet elliptical crystallizer of claim 6, characterized in that: the inner cavity wall surface of the copper pipe is in a multi-section linear curved surface form, a section of linear plane form or a parabolic curved surface form from the inlet to the outlet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920750655.9U CN210305680U (en) | 2019-05-23 | 2019-05-23 | Continuous casting round billet elliptical crystallizer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920750655.9U CN210305680U (en) | 2019-05-23 | 2019-05-23 | Continuous casting round billet elliptical crystallizer |
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| CN210305680U true CN210305680U (en) | 2020-04-14 |
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| CN201920750655.9U Active CN210305680U (en) | 2019-05-23 | 2019-05-23 | Continuous casting round billet elliptical crystallizer |
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