CN2126624Y

CN2126624Y - Special gate for continuous casting of sheet bar

Info

Publication number: CN2126624Y
Application number: CN 92223447
Authority: CN
Inventors: 姬秀琴; 葛文秀; 张慧
Original assignee: Central Iron and Steel Research Institute
Current assignee: Central Iron and Steel Research Institute
Priority date: 1992-06-05
Filing date: 1992-06-05
Publication date: 1993-01-27
Anticipated expiration: 2002-06-05

Abstract

The utility model provides a special water opening for the continuous casting of a sheet bar, which is composed of an upper end in the shape of a circular funnel, a middle upper end in the shape in transition from a circle to an oblate shape, an oblate middle lower end and two water outlets at narrow walls on both sides of the lower end of the water opening, wherein, the distance between the outer end sides of the two water outlets is equal to the size of the oblate maximum outer wall of the middle lower end of the water opening, and the distance between the central axis of the water opening and the outer end side of the water opening is 1-4 times longer than the equivalent diameter of the central bore of the middle lower end of the water opening. The utility model has a comparatively broad application range for the width of continuous casting sheet bars, reduces the turbulent flow of molten steel in a crystallizer with a stable flow field and ensures the quality of the sheet bars.

Description

Special gate for continuous casting of sheet bar

The utility model belongs to the metal continuous cast servicing unit.Mainly be applicable to sheet blank continuous casting.

Sheet blank continuous casting is compared with common continuous casting, and is bigger in the technical difficulty of continuous casting process.Because slab thickness is little, the crystallizer cross section is narrow; The mouth of a river and crystallizer wall spacing are very little, and molten steel is more serious to washing away of casting blank solidification.Near washing away the district, easily form the weak link of solidifying.In addition, the characteristics of sheet blank continuous casting are that pulling rate is fast, and the crystallizer space is little, and the molten steel surface wave is violent, thereby covering slag easily is involved in the steel, influence slab quality.For this reason, sheet blank continuous casting must propose the mouth of a river that the very rational molten steel of a kind of structure imports crystallizer.

The CN87104752A patent has been introduced a kind of submersed nozzle that is used for sheet blank continuous casting.The patent application CN912273488 that the applicant proposed also provides a kind of sheet blank continuous casting special-shaped submersed nozzle.The above-mentioned mouth of a river structurally is divided into three parts: filling pipe end (or water inlet), interlude, delivery port.Delivery port is diapsid, and each delivery port all has the extension of an ear shape, makes and opens when watering, can prevent molten steel splash and the flow angle of molten steel up, can make covering slag be easy to fusing.But there is its common shortcoming at the above-mentioned mouth of a river: the one, and the width of the slab of being cast is restricted, and for this class mouth of a river, the continuous casting steel billet width of being cast is narrow slightly or wide slightly all inapplicable; The 2nd, make processing difficulties.

The purpose of this utility model is to provide a kind of can be applicable to that casting slab width range is wider, and simple in structure, and the sheet blank continuous casting that is easy to make processing is used the extraordinary mouth of a river.

For achieving the above object, the utility model has been taked following major technique measure:

The utility model sheet blank continuous casting structurally divides four parts with the extraordinary mouth of a river: upper end, middle upper end (changeover portion), middle lower end, delivery port.The upper end is garden awl funnel type; In the upper end be changeover portion, its exterior contour and interior hole shape by garden shape to the shape transition of flat garden; The cross section of middle lower end is a flat garden shape; Two narrow wall places, both sides that delivery port is in lower end, the mouth of a river, and two kinds of difformities have been adopted in the delivery port outer face; Two delivery ports are at an angle towards bottom bracket, and planar-shaped, protrusion-shaped or spill can be made in the supporting plate inboard.In addition, two distances between the delivery port outer face are equated with the maximum outer wall dimension of flat garden, lower end shape in the mouth of a river, and mouth of a river central axis to the distance of delivery port outer face is equivalent to 1～4 times of equivalent diameter of flat garden, mouth of a river shape section (middle lower end) central bore.The angle α of delivery port center line and whole mouth of a river central axis is: 90 °＜α＜130 °.The summation of two delivery port areas is 11～25 with the ratio of the area of flat garden, middle lower end shape central bore.

Compared with prior art, the utlity model has following advantage:

1. the width to continuous-casting sheet billet has the bigger scope of application.

2. the turbulent flow of molten steel in crystallizer can be reduced in this mouth of a river, forms stable meniscus, and the flow field is stable, and temperature has evenly guaranteed the quality of slab.

3. because delivery port is not with the ear shape,, be convenient to promote so make processing simply.

4. because the mouth of a river rational in infrastructure, can prolong the service life at the mouth of a river, also improve efficient.

Description of drawings

Accompanying drawing 1 is the vertical section structure schematic diagram of the utility model sheet blank continuous casting with the extraordinary mouth of a river.

Accompanying drawing 2,3 is respectively the schematic diagram of A-A section and B-B section in the accompanying drawing 1.

Accompanying drawing 4,5 is outer face (C in the accompanying drawing 1 to) the shape figure of two kinds of different delivery ports.

In above-mentioned figure, 1 is the upper end at the mouth of a river, is garden awl funnel type; 2 for the middle upper ends at the mouth of a river are changeover portion, its exterior contour and in hole shape by garden shape to flat garden shape (promptly forming) transition by two Ban Yuan and a rectangle, all even current stabilization that favourable steel flows; 3 is the middle lower end at the mouth of a river, and its cross section is a flat garden shape, promptly is made up of two equal Ban Yuan and a rectangle, as shown in Figure 3; 4 is delivery port, is in the lower end of two narrow sidewalls, and the distance between two delivery port outer faces equates with the maximum outer wall of lower end 3 flat garden shapes in the mouth of a river; 5 is bottom bracket, and planar-shaped, protrusion-shaped and spill can be made in the inboard of supporting plate 5; α is the angle of delivery port center line and whole mouth of a river central axis, and 90 °＜α＜130 °; A is the distance between whole mouth of a river central axis and delivery port 4 outer faces, and it is equivalent to 1～4 times of equivalent diameter d of the central bore of lower end 3 in the mouth of a river.The cross sectional shape (being delivery port outer face shape) of the delivery port 4 that parallels with mouth of a river central axis has two kinds: one is two Ban Yuan that equate and the flat garden shape that rectangle is formed, as shown in Figure 4; The 2nd, by up-small and down-big two Ban Yuan and figure that trapezoid is formed, as shown in Figure 5.

But make material aluminium carbonaceous, zirconium matter or the vitreous silica etc. at the mouth of a river.

Claims

1, a kind of sheet blank continuous casting is used the extraordinary mouth of a river, and it comprises two delivery ports that the garden is bored the middle lower end of the upper end of funnel type, flat garden shape, is in narrow wall place, both sides, lower end, the mouth of a river; And bottom bracket; The summation of two delivery port areas is 1.1～2.5 with the ratio of the area of middle lower end central bore; The angle α of delivery port center line and whole mouth of a river central axis is: 90 °＜α＜130 °,

It is characterized in that:

A, have in the bottom of the mouth of a river upper end changeover portion (upper end promptly in), its exterior contour reach interior hole shape by garden shape to the shape transition of flat garden;

Distance between B, two the delivery port outer faces equates with the maximum outer wall dimension of flat garden, lower end shape in the mouth of a river;

Be equivalent to 1～4 times of equivalent diameter d of lower end central bore in the mouth of a river apart from a between C, mouth of a river central axis and the delivery port outer face;

The cross sectional shape (being delivery port outer face shape) of D, the delivery port that parallels with mouth of a river central axis has two kinds: one is two equates Ban Yuan and the flat garden shapes that rectangle is formed; The 2nd, by up-small and down-big two Ban Yuan and figure that trapezoid is formed.

2, the mouth of a river according to claim 1 is characterized in that two delivery ports are at an angle towards bottom bracket.

3, the mouth of a river according to claim 1 and 2 is characterized in that bottom bracket can make planar-shaped, protrusion-shaped or spill.

4, the mouth of a river according to claim 1, but it is characterized in that making material aluminium carbonaceous, zirconium matter or the vitreous silica at the mouth of a river.