CN203330395U

CN203330395U - Anti-blocking submersed nozzle for continuous casting of sheet billet

Info

Publication number: CN203330395U
Application number: CN2013201432855U
Authority: CN
Inventors: 黄玉平; 马立国; 唐雪峰; 李平; 金百刚; 赵成林
Original assignee: Angang Steel Co Ltd
Current assignee: Angang Steel Co Ltd
Priority date: 2013-03-27
Filing date: 2013-03-27
Publication date: 2013-12-11
Anticipated expiration: 2023-03-27

Abstract

The utility model provides an anti-blocking submersed nozzle for continuous casting of a sheet billet. The anti-blocking submersed nozzle is characterized in that the mold cavity of the upper portion inside the nozzle is cylindrical, and is correspondingly the cylindrical area of the nozzle; the mold cavity on the upper half portion of the nozzle is a transition section which is gradually flat and has the equal sectional areas, the transition section is a transition area from a circle to a rectangle, the mold cavity on the lower half portion of the nozzle is in a flat rectangle shape, and is a rectangular area, a subtriangular flow dividing body and two symmetric steel output mouths are arranged on the lower portion of the nozzle, and are called a flow dividing area. The anti-blocking submersed nozzle has the advantages of being capable of being prevented from being blocked, simple in structure, easy to manufacture and convenient to use.

Description

A kind of sheet blank continuous casting Anti-blocking immersion nozzle

Technical field

The utility model belongs to continuous casting technology, is specifically related to the submersed nozzle that a kind of sheet blank continuous casting is used.

Background technology

With the slab CC machine machine, compare, the thickness of the crystallizer of thin-slab caster is only the former 1/6 to 1/3, submersed nozzle Lower Half shaped flat, and section is thin, thereby, in the sheet blank continuous casting process of aluminum killed steel, submersed nozzle for crystallizer more easily occurs and stop up.Nozzle blocking can cause continuous casting production to interrupt after occurring, in sheet blank continuous casting is produced, cast 2～3 tanks occur often, and even nozzle blocking occurs 1 tank.Also can cause the strand slag because changing the mouth of a river in casting process, make slab quality descend; In addition, mouth of a river wadding stream thing enters crystallizer formation strand and is mingled with, and causes finished product to scrap because being mingled with.So nozzle blocking can have a strong impact on normal production, cause product quality decline, yield rate to reduce, increase product cost.

Cause the reason of nozzle blocking to be: thin slab mold is unreasonable with the design of submersed nozzle cavity shape, has turbulent flow, bias current district, and the field trashes such as the alundum (Al2O3) in molten steel transmit to mouth of a river wall, at mouth of a river wall, adheres to and forms dross.Stop up the turbulent region that at first occurs in casting stream, the turbulent region characteristics are reverse flows continually, and field trash directly is carried to mouth of a river wall.The exit at the mouth of a river is stopped up and has seriously just been confirmed this point than other position.So the design at the mouth of a river should be avoided the sudden change of mouth of a river geometry, it is large that area of section becomes, and to guarantee forming laminar flow, minimizing turbulent flow, can prevent the generation of Submerged Nozzle Clogging Course.

At present, the structure at the mouth of a river of using in production is reasonable not, and Nei flow field, the mouth of a river exists bias current, turbulent flow, causes field trash in casting process to accumulate, and causes nozzle blocking, there is no so far the measure of effectively preventing nozzle blocking.

The utility model content

The purpose of this utility model, exactly by a kind of sheet blank continuous casting Anti-blocking immersion nozzle is provided, solves the problem that current Submersed nozzle of sheet billet stops up.

The sheet blank continuous casting Anti-blocking immersion nozzle the utility model proposes, area of section by the inner die cavity the latter half in its mouth of a river reduces gradually, and the design of shunting body and Rouno Cormer Pregrinding Wheel transition, realizes stablizing mouth of a river interior flow field, eliminate turbulent flow, reach the purpose of prevention of immersed nozzle clogging.

The technical solution of the utility model is: mouth of a river inner upper die cavity is cylindrical, corresponds to the column region a at the mouth of a river; Middle and upper part, mouth of a river die cavity is for becoming gradually the flat long-pending changeover portion of uiform section, be the transition region b from circle to rectangle, middle and lower part, mouth of a river die cavity is flat rectangle, is rectangle region c, bottom, the mouth of a river is subtriangular shunting body and the tapping hole of two symmetries, is shunting zone d.Shunting body is divided into two molten steel stream, and the cross-sectional area sum of two tapping holes starts to reduce gradually at the shunting body place, and corner is the Rouno Cormer Pregrinding Wheel transition, and radius of corner is that 5～200mm plays the effect of eliminating bias current and eddy current, and then prevention of immersed nozzle clogging.

Concrete structure of the present utility model has, and mouth of a river inner upper die cavity diameter range is 50～150mm, and length is 100～450mm, and the length of transition region is 135～385mm; The width of mouth of a river rectangle region is 50～180mm, and thickness is 25～100mm, and length is 50～300mm; The drift angle of shunting body is 10 °～80 °, and the drift angle arc radius is 5～60mm; The throat width of tapping hole is 20～80mm, and thickness is 10～60mm; The exit width of tapping hole is 20～80mm, and thickness is 15～50mm, and angle is downward 5 °～65 °.Tapping hole mouth of a river wall radius of corner 50～300mm; The transition region sectional shrinkage is 1%～10%, and the shunting zone sectional shrinkage is 2%～10%.

The utility model advantage and effect are: can prevent Submerged Nozzle Clogging Course; Simple in structure, be easy to make, easy to use.

The accompanying drawing explanation

Accompanying drawing 1 is the utility model anti-clogging soaking water gap structure chart.

Accompanying drawing 2 is the utility model anti-clogging soaking water gap A-A cutaway view.

In figure, 1, mouth of a river inner upper die cavity; 2, middle and upper part, mouth of a river die cavity; 3, middle and lower part, mouth of a river die cavity; 4, shunting body; 5, tapping hole.

The specific embodiment

Below in conjunction with accompanying drawing, the utility model is elaborated:

As shown in Figure 1, 2, mouth of a river inner upper die cavity 1 is cylindrical, corresponds to the column region a at the mouth of a river; Middle and upper part, mouth of a river die cavity 2 is for becoming gradually the flat long-pending changeover portion of uiform section, be the transition region b from circle to rectangle, middle and lower part, mouth of a river die cavity 3 is flat rectangle, is rectangle region c, bottom, the mouth of a river is subtriangular shunting body 4 and the tapping hole 5 of two symmetries, is shunting zone d.Shunting body 4 is divided into two molten steel stream, and the cross-sectional area sum of two tapping holes 5 starts to reduce gradually at the shunting body place, and corner is the Rouno Cormer Pregrinding Wheel transition, plays the effect of eliminating bias current and eddy current, and then prevention of immersed nozzle clogging.

Embodiment 1:

Mouth of a river inner upper die cavity 1 diameter is 80mm, and length is 230mm; The length of transition region b is 265mm; The width of mouth of a river rectangle region c is 130mm, and thickness is 37.5mm, and length is 180mm; The drift angle of shunting body is 60 °, and the drift angle arc radius is 25mm; The throat width of tapping hole is 62mm, and thickness is 37mm; The exit width of tapping hole is 55mm, and thickness is 38mm, and angle is downward 15 °.Tapping hole mouth of a river wall radius of corner 100mm; The transition region sectional shrinkage is 3.0%, and the shunting zone sectional shrinkage is 5.9%.

Embodiment 2:

As shown in Figure 1, 2, mouth of a river inner upper die cavity 1 diameter is 78mm, and length is 225mm; The length of transition region b is 270mm; The width of mouth of a river rectangle region c is 120mm, and thickness is 38mm, and length is 175mm; The drift angle of shunting body 4 is 55 °, and the drift angle arc radius is 30mm; The throat width of tapping hole 5 is 57mm, and thickness is 38mm; The exit width of tapping hole 5 is 56mm, and thickness is 37mm, and angle is downward 13 °.Tapping hole mouth of a river wall radius of corner 110mm; Transition region b sectional shrinkage is 4.5%, and the shunting zone sectional shrinkage is 4.3%.

Embodiment 3:

As shown in Figure 1, 2, mouth of a river inner upper die cavity 1 diameter is 82mm, and length is 228mm; The length of transition region b is 268mm; The width of mouth of a river rectangle region c is 120mm, and thickness is 38mm, and length is 182mm; The drift angle of shunting body 4 is 57 °, and the drift angle arc radius is 33mm; The throat width of tapping hole 5 is 56mm, and thickness is 38mm; The exit width of tapping hole 5 is 55mm, and thickness is 37mm, and angle is downward 16 °.Tapping hole mouth of a river wall radius of corner 112mm; Transition region b sectional shrinkage is 4.6%, and the shunting zone sectional shrinkage is 4.35%.

Claims

1. a sheet blank continuous casting Anti-blocking immersion nozzle, is characterized in that, mouth of a river inner upper die cavity (1) is cylindrical, corresponds to the column region at the mouth of a river; Middle and upper part, mouth of a river die cavity (2) is for becoming gradually the flat long-pending changeover portion of uiform section, be the transition region from circle to rectangle, middle and lower part, mouth of a river die cavity (3) is flat rectangle, be rectangle region, bottom, the mouth of a river is subtriangular shunting body (4) and the tapping hole (5) of two symmetries, is shunting zone.

2. a kind of sheet blank continuous casting Anti-blocking immersion nozzle according to claim 1, is characterized in that, mouth of a river inner upper die cavity (1) diameter range is 50～150mm, and length range is 100～450mm, and the length range of transition region is 135～385mm.

3. a kind of sheet blank continuous casting Anti-blocking immersion nozzle according to claim 1, is characterized in that, the width range of mouth of a river rectangle region is 50～180mm, and thickness range is 25～100mm, and length range is 50～300mm.

4. a kind of sheet blank continuous casting Anti-blocking immersion nozzle according to claim 1, is characterized in that, the drift angle of shunting body is 10 °～80 °, and the drift angle arc radius is 5～60mm.

5. a kind of sheet blank continuous casting Anti-blocking immersion nozzle according to claim 1, is characterized in that, the throat width of tapping hole is 20～80mm, and thickness is 10～60mm; The exit width of tapping hole is 20～80mm, and thickness is 15～50mm, and angle is downward 5 °～65 °, tapping hole mouth of a river wall radius of corner 50～300mm; The transition region sectional shrinkage is 1%～10%, and the shunting zone sectional shrinkage is 2%～10%.