Tundish cover and tundish baking structure and method

Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a tundish cover and a tundish baking structure and method. Comprising a steel structure and castable, the steel structure comprises a top face, an outer frame, a plurality of transverse supports and a plurality of longitudinal supports, wherein the outer frame is arranged on the top face and matched with the edge of the top face in shape, the transverse supports are parallel to one another, and the longitudinal supports are perpendicular to the transverse supports. The two ends of the transverse support are connected with the outer frame; at least two longitudinal supports are connected between the outer frame and the adjacent transverse supports; at least two longitudinal supports are connected between every two adjacent transverse supports; baking holes are formed in the top surface; and the castable is a refractory material and is used for covering the steel structure. By changing the steel structure of the tundish cover and the baking structure of the tundish and adjusting the ratio of air to coal gas during baking, the service life of the tundish cover is prolonged from 20 hours to more than 40 hours, the cost is greatly reduced, and the production efficiency and the production qualification rate are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of metallurgy, and particularly relates to a tundish cover, a tundish baking structure and a method. BACKGROUND

[0002] The tundish cover is a heat preservation and insulation equipment applied to the tundish continuous casting in steel metallurgy, which plays a crucial role in the production process. Firstly, it is used for baking the tundish to ensure that the flame can fully contact the refractory material on the bottom and side of the tundish, so as to raise the temperature of the tundish refractory material to about 1100 DEG C to achieve the effect of "red package receiving steel". In addition, the tundish cover also has the effect of heat preservation, which can effectively reduce the heat loss of molten steel, maintain the temperature of molten steel, and to some extent, reduce the oxidation of molten steel. The tundish cover has a large span, is continuously affected by high temperature and has a poor working environment, and thus is easily damaged to affect the service life.

[0003] The existing tundish cover has the following problems: (1) the longitudinal support of the steel structure is directly connected at both ends by a whole steel strip, and due to the long span, the thermal stress received by the position close to the steel receiving port is increased, so that deformation is easily caused; at the same time, the whole steel structure is in the same horizontal plane, and the castable cannot completely cover, so that the flame directly contacts the steel structure during the baking process, further accelerating the deformation speed of the steel structure. (2) The sealing between the tundish cover and the tundish is poor, so that the flame will escape during the baking process, causing the flame to directly bake the tundish cover from the outside. (3) The position of the baker is adjusted by manual adjustment to align the baker with the baking hole for baking, and after multiple adjustments, the baker is gradually deviated from the baking position, so that the tundish cover is directly baked by the baker. (4) The baking time is too long, causing the castable to fall off, exposing the steel structure directly to the flame, and the falling material may block the water gap, causing casting difficulty or even casting failure, and may also contaminate the molten steel. The above problems make the service life of the tundish cover generally only about 20h, which not only needs to be frequently replaced, causing high production cost and high labor intensity, but also affects the production efficiency and production qualification rate. SUMMARY

[0004] The present application aims to at least solve one of the problems in the prior art or related art, i.e. the short service life, high cost, low production efficiency and low production qualification rate of the tundish cover.

[0005] In view of this, the first aspect of the present application provides a tundish cover which improves the bearing capacity and tensile strength of the steel structure, thereby reducing the deformation speed of the steel structure.

[0006] The second aspect of the present application provides a tundish baking structure, which comprises the above-mentioned tundish cover, and by providing a sealing layer and a limiting fixing piece, the tundish cover is prevented from being directly baked.

[0007] The third aspect of the present application provides a tundish baking method, which uses the tundish baking structure described above, and shortens the baking time by adjusting the ratio of air and gas during baking.

[0008] Specifically, the technical solutions include the following.

[0009] According to the first aspect of the present application, a tundish cover is provided, which comprises a steel structure and castable; the steel structure comprises a top surface, an outer frame arranged on the top surface and matching the shape of the edge of the top surface, a plurality of mutually parallel transverse supports, and a plurality of longitudinal supports perpendicular to the transverse supports; both ends of the transverse support are connected to the outer frame; at least two longitudinal supports are connected between the outer frame and the adjacent transverse support; at least two longitudinal supports are connected between the adjacent two transverse supports; a baking hole is formed on the top surface; the castable is a refractory material for covering the steel structure.

[0010] Further, the outer side of the outer frame is higher than the inner side of the outer frame, the transverse support, and the longitudinal support.

[0011] Further, the castable wraps the entire outer surface of the steel structure.

[0012] According to the second aspect of the present application, a tundish baking structure is provided, which comprises a tundish cover, a tundish, and a baker as described in any of the above technical solutions; the tundish cover covers the tundish, and the shape of the outer frame matches the shape of the upper opening of the tundish; the tundish can move along the track arranged on the ground; the baker is suspended above the tundish cover and is fixed relative to the position of the ground.

[0013] Further, a limiter and a fixer are arranged on the tundish and the track, which are used to prevent the tundish from continuing to move and fix the position of the tundish when the baking hole is directly opposite the baker.

[0014] Further, a fireproof sealing layer is arranged between the tundish cover and the tundish, which is used to prevent the flame from escaping from the gap between the tundish cover and the tundish.

[0015] Preferably, the fireproof sealing layer comprises an asbestos layer.

[0016] According to the third aspect of the present application, a tundish baking method is provided, which uses the tundish baking structure as described in any of the above technical solutions to bake the tundish, and the method comprises: moving the tundish along the track until the baking hole is directly opposite the baker; and baking.

[0017] Further, after the baking hole is opposite to the baker, the method further comprises: fixing the position of the tundish using the fixer.

[0018] Further, in the step of baking, the flow ratio of air to gas is 2.1-2.3:1.

[0019] Compared with the prior art, the present application at least has the following beneficial effects:

[0020] The present application improves the carrying capacity and tensile strength of the steel structure of the tundish cover by changing the steel structure of the tundish cover, thereby reducing the deformation speed of the steel structure; by setting the sealing layer, the position limiter and the fixer, the tundish cover is prevented from being directly baked; by adjusting the ratio of air to gas during baking, the baking time is shortened. Thus, the service life of the tundish cover is improved from 20h to more than 40h, the cost is greatly reduced, and the production efficiency and production qualification rate are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the present application. In the drawings:

[0022] Figure 1 is a structural schematic diagram of the tundish cover in the embodiment of the present application;

[0023] Figure 2 is a structural schematic diagram of the tundish baking structure in the embodiment of the present application.

[0024] The reference signs are represented as:

[0025] 1-top surface; 11-baking hole; 2-outer frame; 3-horizontal support; 4-longitudinal support; 5-tundish; 6-baker; 7-asbestos layer. DETAILED DESCRIPTION

[0026] In order to better understand the above technical solutions, the technical solutions of the embodiments of the present application will be described in detail below with the help of the drawings and specific embodiments. It should be understood that the specific features in the embodiments of the present application and the specific embodiments are detailed descriptions of the technical solutions of the embodiments of the present application, and are not limitations of the technical solutions of the present application. In the case of no conflict, the technical features in the embodiments of the present application and the specific embodiments can be combined with each other.

[0027] Therefore, according to the first aspect of the embodiment of the present application, a tundish cover is provided, which comprises a steel structure and castable; as Figure 1As shown, the steel structure comprises a top surface 1, an outer frame 2 arranged on the top surface 1 and matching the shape of the edge of the top surface 1, a plurality of mutually parallel transverse supports 3, and a plurality of longitudinal supports 4 perpendicular to the transverse supports 3; both ends of the transverse support 3 are connected to the outer frame 2; at least two longitudinal supports 4 are connected between the outer frame 2 and the adjacent transverse support 3; at least two longitudinal supports 4 are connected between two adjacent transverse supports 3; a baking hole 11 is formed on the top surface 1; the castable is a refractory material for covering the steel structure.

[0028] Specifically, the longitudinal support 4 is replaced by a plurality of short steels, which shortens the span of a single longitudinal support 4, thereby improving the load-bearing capacity and tensile strength of the steel structure and greatly reducing the deformation speed of the steel structure.

[0029] Further, in one embodiment, the outer side of the outer frame 2 is higher than the inner side of the outer frame 2, the transverse support 3 and the longitudinal support 4.

[0030] Further, in one embodiment, the castable wraps the entire outer surface of the steel structure.

[0031] Specifically, the inner beam height of the steel structure is reduced, so that the entire steel structure forms a concave state with high surrounding and low middle, which is more conducive to wrapping the castable around every exposed surface of the steel structure during casting, thereby ensuring that the high temperature during baking and casting cannot directly ablate the steel structure without damaging the castable, further reducing the deformation speed of the steel structure.

[0032] According to the second aspect of the embodiment of the present application, a tundish baking structure is provided, comprising the tundish cover, the tundish 5 and the baker 6 of any of the above technical solutions; as Figure 2 As shown, the tundish cover covers the tundish 5, and the shape of the outer frame 2 matches the shape of the upper opening of the tundish 5; the tundish 5 can move along the track arranged on the ground; the baker 6 is suspended above the tundish cover, and the position relative to the ground is fixed.

[0033] Further, in one embodiment, a limiter and a fixer are arranged on the tundish 5 and the track, which are used to prevent the tundish 5 from continuing to move and fix the position of the tundish 5 when the baking hole 11 is opposite the baker 6.

[0034] Specifically, the position of the roaster 6 is fixed, and the position limiter is arranged at the corresponding position of the trolley and the tundish 5. When the worker pushes the tundish 5 to move on the trolley, the tundish 5 automatically stops moving once the position limiter is triggered, and at this time, the roasting hole 11 is opposite to the roaster 6. Then, the position of the tundish 5 is fixed by the fixer, so that the roasting hole 11 can be opposite to the roaster 6 during the whole roasting process, and displacement does not occur, thereby avoiding the problem that the tundish cover is directly roasted by the roaster 6 due to the relative displacement between the tundish 5 and the roaster 6, and the service life of the tundish cover is affected.

[0035] Further, in an embodiment, a fireproof sealing layer is arranged between the tundish cover and the tundish 5, and is used to prevent the flame from leaking out of the gap between the tundish cover and the tundish 5.

[0036] Preferably, in the specific embodiment, the fireproof sealing layer comprises an asbestos layer 7.

[0037] Specifically, if the sealing between the tundish cover and the tundish 5 is poor, the flame will leak out of the gap between the tundish cover and the tundish 5 during the roasting process, and the tundish cover is externally roasted, thereby affecting the service life of the tundish cover. In actual operation, the asbestos layer with a thickness of 20 mm arranged between the tundish cover and the tundish 5 can achieve good sealing effect. It should be noted that the material selection and thickness of the fireproof sealing layer are not limited to the protection scope of the present application.

[0038] According to a third aspect of the embodiment of the present application, a tundish roasting method is provided, which uses the tundish roasting structure according to any one of the technical solutions to roast the tundish 5, and the method comprises the following steps: moving the tundish 5 along the trolley until the roasting hole 11 is opposite to the roaster 6; and roasting.

[0039] Further, in an embodiment, after the roasting hole 11 is opposite to the roaster 6, the method further comprises the step of fixing the position of the tundish 5 by using the fixer.

[0040] Further, in an embodiment, in the step of roasting, the flow ratio of air to gas is 2.1-2.3:1.

[0041] Specifically, when roasting, the flow ratio of air to gas is adjusted from the existing 2.0:1 to 2.1-2.3:1, which can shorten the roasting time, thereby further improving the service life of the tundish cover. Taking the flow ratio of air to gas as 2.2:1 as an example, the roasting time can be shortened by 0.5 h.

[0042] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "certain embodiments", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in an appropriate manner.

[0043] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tundish cover, characterized by, The steel structure and the castable are included; The steel structure includes a top surface (1), an outer frame (2) arranged on the top surface (1) and matching the shape of the edge of the top surface (1), a plurality of mutually parallel transverse supports (3), and a plurality of longitudinal supports (4) perpendicular to the transverse supports (3); Both ends of the transverse support (3) are connected to the outer frame (2); At least two longitudinal supports (4) are connected between the outer frame (2) and the adjacent transverse support (3); At least two longitudinal supports (4) are connected between the adjacent two transverse supports (3); A baking hole (11) is arranged on the top surface (1); The castable is a refractory material used to cover the steel structure.

2. The tundish cover according to claim 1, characterized in that The outer side of the outer frame (2) is higher than the inner side of the outer frame (2), the transverse support (3), and the longitudinal support (4).

3. The tundish cover according to claim 2, characterized in that The castable wraps all the outer surfaces of the steel structure.

4. A tundish baking structure characterized by comprising: The tundish cover, the tundish (5), and the baker (6) are included; The tundish cover covers the tundish (5), and the shape of the outer frame (2) matches the shape of the upper opening of the tundish (5); The tundish (5) can move along the track arranged on the ground; The baker (6) is suspended above the tundish cover and is fixed in position relative to the ground.

5. The tundish baking structure according to claim 4, wherein A limiter and a fixer are arranged on the tundish (5) and the track, which are used to prevent the tundish (5) from continuing to move and fix the position of the tundish (5) when the baking hole (11) is directly opposite the baker (6).

6. The tundish baking structure according to claim 4, wherein A fireproof sealing layer is arranged between the tundish cover and the tundish (5) to prevent the flame from escaping from the gap between the tundish cover and the tundish (5).

7. The tundish baking structure according to claim 6, characterized by The fireproof sealing layer includes an asbestos layer (7).

8. A tundish baking method characterized by, The tundish (5) is baked using the tundish baking structure according to any one of claims 4 to 7, and the method includes: Moving the tundish (5) along the track until the baking hole (11) is directly opposite the baker (6); Baking.

9. The tundish toasting method according to claim 8, characterized in that, After the baking hole (11) is directly opposite the baker (6), the method further includes fixing the position of the tundish (5) using the fixer.

10. The tundish roasting method according to claim 8, characterized by, In the step of baking, the flow ratio of air to gas is 2.1-2.3:1.

Images