CN202779670U

CN202779670U - Improved flame cutting gun nozzle

Info

Publication number: CN202779670U
Application number: CN 201220375877
Authority: CN
Inventors: 李波; 常金宝; 廖志海; 张越; 朱祥亮; 韩志杰; 王子然; 王欣; 陈志月
Original assignee: Hebei Iron and Steel Co Ltd Tangshan Branch
Current assignee: HBIS Co Ltd Tangshan Branch
Priority date: 2012-08-01
Filing date: 2012-08-01
Publication date: 2013-03-13
Anticipated expiration: 2022-08-01

Abstract

The utility model provides an improved flame cutting gun nozzle and belongs to the technical field of flame cutting tools. The improved flame cutting gun nozzle is used for decreasing an cutting opening of a continuous casting steel billet to be cut. The technical scheme is that an annular fixing bin is added at the gas outlet end of a cutting nozzle and is a circular ring shaped groove, the circular ring shaped groove coincides with the upper end of a mixed gas vent hole arranged in an annular mode and located at the gas outlet end of the cutting nozzle, and the upper end of the mixed gas vent hole arranged in the annular mode is a circular ring. The bundle distribution of high-temperature combusted gas is eliminated, surrounding air is prevented from being rolled into, the temperature of the combusted gas is improved, a preheating range is accurate, the temperature is high, cutting oxygen is centralized in a cutting range on a casting billet, and the cutting opening is decreased to be less than 3.1mm from original 5mm. In addition, splashing sprayed molten steel is decreased through stable high-temperature air flows, and the service life of the cutting nozzle is improved. The improved flame cutting gun nozzle is simple in structure, effectively reduces steel billet consumption when the steel billet is cut, and remarkably improves the benefit.

Description

A kind of improved flame cutter mouth

Technical field

The utility model relates to a kind of flame cutter mouth that continuous casting steel billet is cut, and belongs to Flame-cutter tool technical field.

Background technology

In the continuous casting of iron and steel enterprise is produced, need to cut continuous casting steel billet, steel mill's continuous casting working procedure adopts special vertical gas to carry out the flame cutting as combustion gas at present, and scarfing is generally all about 5mm.Owing to the form of combustion gas kind and existing cutting head, limited the size of scarfing.Steel take certain iron and steel enterprise rolls factory as example, and scarfing reduces 1mm, and every year just can be from more than 450 ton of strand consumption of this reduction of scarfing.Become the important brainstorm subject that steel mill reduces iron and steel stock consumption so reduce scarfing.For reducing this problem of scarfing, a lot of steel mills and cutting gun producer all do a lot of work, but generally all are confined to dwindle scarfing by changing the size of cutting oxygen passage throat diameter.For example, the steel of certain iron and steel enterprise rolls factory's continuous casting workshop, and by cutting oxygen passage aditus laryngis is dropped to 1.9mm by 2.5mm, scarfing can drop to 4mm by 6mm.If but want scarfing is dropped to below the 4mm, only by dwindling cutting oxygen passage aditus laryngis, can't accomplish.The cutting oxygen pressure of tradition cutting head is controlled at 1.3-1.5MPa, and excessive pressure can aggravate to cut the wearing and tearing of oxygen passage aditus laryngis, so that cutting head uses the later stage scarfing obviously to increase.Therefore be necessary to adopt other method that cutting head is improved, to reach the purpose of dwindling scarfing.

The utility model content

Technical problem to be solved in the utility model provides a kind of improved flame cutter mouth that can effectively reduce strand cutting scarfing, reduce steel consumption, also can avoid cutting head to use the later stage scarfing to enlarge.

The technical scheme that solves the problems of the technologies described above is:

A kind of improved flame cutter mouth, increased annular mixing bunker in the outlet side of cutting head, the annular mixing bunker is toroidal cavity, toroidal cavity coincides with the gaseous mixture passage upper end of the annular array that is positioned at the cutting head outlet side, is annulus with being communicated with on the gaseous mixture passage of annular array.

Above-mentioned improved flame cutter mouth, the degree of depth of the toroidal cavity of described annular mixing bunker is 4-6mm, width is 2-3.5mm.

The beneficial effects of the utility model are:

The utility model is on the basis of former cutting head, gaseous mixture passage outlet side is got through, form the annular mixing bunker of a certain depth, by annular mixing bunker, the pencil of eliminating high-temperature combustion gas distributes, reach stable air pressure, being involved in of surrounding air avoided in the effect of uniform air flow, improved the temperature of burning gases, dwindled the scope of burning gases, avoided the diffusion of high-temperature gas, made the scope of preheating more accurate, temperature is higher, more be conducive to cutting, the cut coverage of cutting oxygen on strand is more concentrated, and scarfing obviously reduces, and scarfing is reduced to below the 3.1mm by original 5mm; Simultaneously, stablizing of high temperature gas flow reduced the splash of the spray of molten steel, effectively avoided the phenomenon that cutting head is stopped up by the steel knurl in the cutting process, the life-span of having improved cutting head.The utility model is simple in structure, has solved a difficult problem that does not have solution for a long time, to the consumption of steel billet, has significantly improved benefit when having effectively reduced the cutting steel billet.

Description of drawings

Fig. 1 is structural representation of the present utility model;

Fig. 2 is the A-A cutaway view of Fig. 1.

Mark is as follows among the figure: cutting head 1, gaseous mixture passage 2, annular mixing bunker 3.

The specific embodiment

Show among the figure, the gaseous mixture passage 2 that annular array is arranged in the outlet side of original cutting head 1, the utility model has increased annular mixing bunker 3, annular mixing bunker 3 is toroidal cavity, toroidal cavity coincides with gaseous mixture passage 2 upper ends that are positioned at the cutting head outlet side, gaseous mixture passage 2 upper ends of annular array is communicated be annulus.

Show among the figure that the utility model is on the basis of former cutting head 1, go out annular mixing bunker 3 with machine tooling.The annular mixing bunker is centered by the cutting head center, and the degree of depth is 4-6mm, and width is 2-3.5mm, and overall diameter is 13mm.The degree of depth of the annular mixing bunker 3 of an embodiment of the present utility model is 5mm, and width is 3.2mm.

The utility model cuts oxygen pressure and is controlled at 1.0-1.2MPa in cutting process, preheat oxygen pressure is controlled at 0.15-0.25MPa, and gaseous-pressure is controlled at 0.04-0.06MPa.According to slab thickness, cutting speed and strand temperature, rationally regulate cutting oxygen, preheat oxygen, gaseous-pressure, can be controlled at scarfing below the 3.1mm.

Claims

1. improved flame cutter mouth, it is characterized in that: increased annular mixing bunker (3) in the outlet side of cutting head (1), annular mixing bunker (3) is toroidal cavity, toroidal cavity coincides with gaseous mixture passage (2) upper end of the annular array that is positioned at cutting head (1) outlet side, is annulus with being communicated with on the gaseous mixture passage (2) of annular array.

2. improved flame cutter mouth according to claim 1, it is characterized in that: the degree of depth of the toroidal cavity of described annular mixing bunker (3) is 4-6mm, width is 2-3.5mm.