CN201008964Y - Immersed water gap of bakie - Google Patents

Abstract

The utility model discloses a soak type runner stripper for middle package which is a tube shape structure. A rotary patch is arranged inside the runner stripper, and the rotary patch is spiral shape. A concave portion is arranged at the bottom of the rotary patch, while a convex portion is arranged upper part of the rotary patch. The concave portion is arranged at the bottom of the rotary patch of the runner stripper, therefore, the direct connected zone area is increased without enlarging the rotary angle, thereby reducing the resistance of molten steel and the pressure cover on the upper and the lower ends of the rotary patch and preventing the molten steel from cooling and nodular. The convex portion is arranged on the top of the rotary patch, thereby effectively eliminating the erosion speed in the center of the rotary patch faster than on two borders and improving the life-span of the rotary patch and the runner stripper. Additionally, the upper top end of the convex portion is knife edge shape, thereby reducing the washing on the upper part of the rotary portion of the molten steel, further improving the life span of the rotary patch and the runner stripper, saving producing cost and increasing economical benefit.

Description

The submersed nozzle of tundish

Technical field

The utility model relates to the cast annex in the continuous casting of molten steel, more particularly, relates to a kind of submersed nozzle of tundish, and this submersed nozzle can effectively prevent the molten steel dross, and can prolong the service life at the revolving fragment and the mouth of a river.

Background technology

Continuous casting of molten steel be with the molten steel in the ladle by the tundish transition, pour into again that crystallizer cools off and continuous solidification becomes the technology of strand.In order to prevent molten steel oxidation in the casting process, submersed nozzle is adopted at the mouth of a river of tundish, and molten steel directly enters in the crystallizer by submersed nozzle, carries out the totally-enclosed cast of molten steel.Development along with continuous casting process, in order to reduce molten steel that submersed nozzle flows out to the impact of new green compact shell in the crystallizer, the liquid fluctuating that increases floating foreign ability in the molten steel and alleviate molten steel, at present, the general technology that adopts the molten steel generation in the submersed nozzle to rotatablely move solves the problems referred to above, thereby reaches the purpose of optimizing continuous casting process, improving slab quality.See also shown in Figure 1ly, the submersed nozzle 10 of tundish is a tubulose, and inside is provided with revolving fragment 11, please again in conjunction with Fig. 2-shown in Figure 3, these revolving fragment 11 curls, top and lower parallel, when the steel flow in the submersed nozzle was crossed revolving fragment 11, revolving fragment 11 guide molten steel produced and rotatablely move.See also shown in Figure 4, in order to improve the effect that rotatablely moves that revolving fragment 11 guide molten steel produce, generally need to increase the spiral angle θ of revolving fragment 11, but spiral angle θ is big more, the angle [alpha] of the straight-through district A of this revolving fragment 11 is just more little, the area of straight-through district A is also just more little, resistance to molten steel increases, thereby increased the pressure reduction of the molten steel of revolving fragment 11 upper/lower terminals, cause these mouth of a river 10 lower inner wall molten steel cools drosses easily, cause the internal diameter at the mouth of a river 10 more and more littler, finally must not change the mouth of a river because of steel-passing amount catches up with poring rate.Because revolving fragment 11 is subjected to washing away of high-temperature molten steel all the time, and revolving fragment 11 centres are etched prior to the position, both sides easily, therefore influence 11 life-spans of revolving fragment greatly in addition, reduced the service life of submersed nozzle 10, increased production cost.Submersed nozzle generally is together to change with tundish, connect in theory and water the words that the stove number reaches the 7-8 stove, help operation and technology direct motion, but because the service life of existing submersed nozzle is low, easily produce the dross problem, often after using 3 stoves, just have to stop using,, but also can bring certain potential safety hazard if the online replacing mouth of a river can be unfavorable for steady production.

The patent No. is the Japan Patent of JP2003033848, JP2003181604, ratio by control revolving fragment and mouth of a river upper end distance, revolving fragment sectional area and mouth of a river area less than 15%, revolving fragment upper direction and mouth of a river slide plate move towards that angle is less than or equal to the design of 0.7 equidimension less than the ratio of 30 °, the revolving fragment anglec of rotation and revolving fragment height and installation method is alleviated the dross problem, but effect is not very desirable, service life of the raising revolving fragment of efficiency not yet.

The patent No. is the Japan Patent of JP2002219561, adopt honeycomb cellular material to make revolving fragment and peripheral mouth of a river inwall, overcome dross by the Argon measure, though effect is obvious, but processing cost height, and cellular material high temperature resistance molten steel scouring ability is relatively poor, still fails effectively to solve the problem in service life of revolving fragment.

The utility model content

Be easy to generate the short shortcoming in service life at molten steel dross, revolving fragment and the mouth of a river at the above-mentioned mouth of a river that exists in the prior art, the purpose of this utility model provides a kind of submersed nozzle of tundish, this gate structure is simple, easy to use, the molten steel dross can be effectively prevented, and the service life at the revolving fragment and the mouth of a river can be prolonged.

For achieving the above object, the utility model adopts following technical scheme:

The submersed nozzle of this tundish, this mouth of a river are tubular structure, and inside, the mouth of a river is provided with revolving fragment, and revolving fragment is shape in the shape of a spiral, and the bottom design of described revolving fragment has the matrix part, and the upper design of revolving fragment has the convex part.

Described convex partly is the vertical platy structure of circular arc type, and the thickness of convex part equates with the thickness of revolving fragment; The bottom lengths of convex part and the equal diameters of revolving fragment; The bottom of convex part overlaps and is connected and fixed with the top of revolving fragment.

The upper end of described convex part is a blade-like, and blade upwards.

In technique scheme, the submersed nozzle of tundish of the present utility model is a tubular structure, and inside, the mouth of a river is provided with revolving fragment, and revolving fragment is shape in the shape of a spiral, and the bottom design of revolving fragment has the matrix part, and the upper design of revolving fragment has the convex part.Because the bottom design of the revolving fragment at this mouth of a river has the matrix part, make that not needing to increase the anglec of rotation has just increased straight-through district area, reduce the resistance of molten steel, thereby reduced the pressure reduction of the molten steel of revolving fragment upper/lower terminal, prevent the molten steel cools dross.And the upper design of revolving fragment has the convex part, and the core that can effectively weaken revolving fragment is etched prior to the position, both sides, has improved the service life at the revolving fragment and the mouth of a river.In addition because the upper end of convex part is a blade-like, can alleviate molten steel to the washing away of revolving fragment top, further improved the service life at the revolving fragment and the mouth of a river, saved production cost, increased economic benefit.

Description of drawings

Fig. 1 is the structure cross-sectional schematic of submersed nozzle of the tundish of prior art;

Fig. 2 is the structural representation of the revolving fragment of prior art;

Fig. 3 is the structure schematic side view of the revolving fragment of prior art;

Fig. 4 is the structure schematic top plan view of the revolving fragment of prior art;

Fig. 5 is the structure cross-sectional schematic of the submersed nozzle of tundish of the present utility model;

Fig. 6 is the structural representation of revolving fragment of the present utility model;

Fig. 7 is the structure schematic side view of revolving fragment of the present utility model;

Fig. 8 is the structure schematic top plan view of revolving fragment of the present utility model.

The specific embodiment

Further specify the technical solution of the utility model below in conjunction with drawings and Examples.

See also shown in Figure 5, the submersed nozzle 20 of tundish of the present utility model is a tubulose, the upper end is connected with tundish and communicates, (not shown) in the crystallizer is immersed in the lower end, inside is provided with revolving fragment 21, this revolving fragment 21 is shape in the shape of a spiral, and when steel flow was crossed revolving fragment 21, revolving fragment 21 guide molten steel produced and rotatablely move.Please in conjunction with Fig. 6-shown in Figure 8, the bottom design of revolving fragment 21 has matrix part 22, make the area of the straight-through district B of revolving fragment 21 increase by two dash area (see figure 8)s, because need not to increase the anglec of rotation has just increased straight-through district area, avoid the increase of molten steel resistance, thereby avoided the increase of the molten steel pressure reduction of revolving fragment upper/lower terminal, played the effect that prevents the molten steel cools dross.The upper design of revolving fragment 21 has convex part 23, and convex part 23 is the vertical platy structure of circular arc type, and the thickness of convex part 23 equates with the thickness of revolving fragment 21; The equal diameters of the bottom lengths of convex part 23 and revolving fragment 21; The bottom of convex part 23 overlaps and is connected and fixed with the top of revolving fragment 21, forms integrative-structure.Also can be splicing construction.This convex part 23 can be avoided becoming matrix 22 to cause the reduction of revolving fragment 21 intensity owing to the bottom design of revolving fragment 21, and because revolving fragment top environment of living in is the most abominable, directly bear washing away of the molten steel that flows, adopt this convex part 23 to help improving the scouring capability of the anti-molten steel in revolving fragment top, effectively suppress the phenomenon that the revolving fragment centre is etched prior to both sides, this convex part 23 vertically is connected with the top of revolving fragment 21 and is fixing in addition, can not have influence on straight-through district B area.The upper end 24 of this convex part 23 is designed to blade-like, and blade upwards, this design can effectively reduce the resistance of 21 pairs of molten steel of revolving fragment, alleviates the souring of molten steel to revolving fragment 21 heads, thereby also helps improving the service life of revolving fragment 21 and submersed nozzle 20.

Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the utility model, and be not to be used as qualification of the present utility model, as long as in connotation scope of the present utility model, all will drop in claims scope of the present utility model variation, the modification of the above embodiment.

Claims (3)

1. the submersed nozzle of a tundish, this mouth of a river is a tubular structure, and inside, the mouth of a river is provided with revolving fragment, and revolving fragment is shape in the shape of a spiral, it is characterized in that:

The bottom design of described revolving fragment has the matrix part, and the upper design of revolving fragment has the convex part.

2. the submersed nozzle of tundish as claimed in claim 1 is characterized in that:

Described convex partly is the vertical platy structure of circular arc type, and the thickness of convex part equates with the thickness of revolving fragment; The bottom lengths of convex part and the equal diameters of revolving fragment; The bottom of convex part overlaps and is connected and fixed with the top of revolving fragment.

3. the submersed nozzle of tundish as claimed in claim 1 or 2 is characterized in that:

The upper end of described convex part is a blade-like, and blade upwards.

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