CN200963676Y

CN200963676Y - Automatic casting piston for ladle

Info

Publication number: CN200963676Y
Application number: CN 200620043235
Authority: CN
Inventors: 刘竑
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 2006-06-27
Filing date: 2006-06-27
Publication date: 2007-10-24
Anticipated expiration: 2016-06-27

Abstract

A steel wrap automatic pouring stopper is arranged in the water gap, the body of the automatic pouring stopper is of a bar-shaped structure, comprising a core and a cover. A center hole is arranged at the center of the core; the core is formed by casting flame-resistance material, the cover is made from steel. The flame-resistance material of the core comprises steel fiber. The top of the core is protruding; the diameter of the body of the automatic pouring stopper is smaller than the inner diameter of the water gap. The automatic pouring stopper of the utility model is pushed to the upper part of the water gap from the upper slide board when the steel wrap is at the sliding water gap (at this time, the steel wrap is in decumbence condition), the steel water gap is pricked up after the sliding water gap is arranged, the stream-guide sand is poured into the upper water gap and the base brick position from the top of the steel wrap. The utility model can effectively control the thickness of the sintering sand of the steam-guide sand, and at the same time, the material stack of steam-guide at the lower part is reduced. At the moment of opening the slide board, the steel liquid can be quickly poured out at the action of the gravity of the pouring stopper and the static pressure of the steel liquid, so the automatic pouring of steel wrap is realized.

Description

Ladle automatic casting plug

Technical field

The utility model relates to the pouring molten steel technology that ladle is smelted, particularly ladle automatic casting apparatus.

Background technology

The later stage sixties worldwide owing to the development of continuous casting production and the exploitation of furnace outer refining process, thereby has prolonged the time of staying of molten steel in ladle, makes original stopper formula cast instrument can't satisfy the requirement of continuous casting and external refining.Pouring technology also requires to provide accurate, rapid, safe and reliable cast instrument simultaneously, thereby has promoted the research and development and the development of slide gate nozzle pouring technology.

At present, steel mill tradition ladle automatic casting mode is: ladle is before the splendid attire molten steel, coagulate steel for avoiding molten steel directly to contact with filling pipe end, need to add drainage sand (drainage agent) in the mouth of a river, its intended purposes is that molten steel can flow out automatically with the outflow of drainage sand after mouth of a river slide plate is opened.

Open the relation of watering this process time distribution and self-opening rate from the converter tapping to the continuous casting, as can be seen, with the prolongation of process time, self-opening rate descends.Its reason be the drainage agent under the high-temperature molten steel effect, prolong the sinter layer thickening in time, cause due to molten steel can not break through sinter layer.The relation of liquid steel temperature and self-opening rate.Can be known that by the field statistics data liquid steel temperature is high more in the ladle, self-opening rate is low more.Explanation is under the drainage agent condition of same prescription, and high its sintering of temperature is fast, and the sinter layer thickening is unfavorable for that ferrostatic pressure breaks through sinter layer.

Along with the development of ladle metallurgy technology in modern age, the time that molten steel stops in the ladle is more and more longer, and temperature is also more and more higher.Drainage sand often is in the condition of high temperature for a long time in ladle nozzle, the thickness of sinter layer is difficult to control; Drainage sand in use bears bigger ferrostatic pressure effect, is easy to generate scaffold.Therefore, drainage sand at high temperature has suitable amount of liquid phase and thin sintering solid-phase layer is the prerequisite that open certainly at the mouth of a river, and sinter layer should be as much as possible away from slide plate.

Conventional ladle operating process is: ladle dress slide gate nozzle → ladle baking → can drainage sand → converter tapping in the mouth of a river → ladle refining processing → continuous casting ladle turret → ladle automatic casting.

As shown in Figure 1, traditional automatic casting plug 10 is arranged in filling pipe end 20, and brick cup 30 upper surfaces and drainage sand 40 upsides are for meeting the steel face under the ladle.Ladle is opened when watering, the upper slide 501 of skateboard component 50 is twitched to open with mechanism and is watered the position, with lower skateboard 502, down the mouth of a river 60 is corresponding, 501 moments of upper slide are being opened in bottom not sintering drainage sand 40, filling pipe end 20 bottoms do not have the drainage sand of sintering to flow out rapidly by the self gravitation effect, a large amount of cold airs is entered, cause drainage sand 40 sand sinter layers to produce very big thermal stress in both sides up and down, thermal stress causes that fragility sinter layer crackle expands rapidly, sinter layer is destroyed fully under the static pressure effect of molten steel, thereby reaches the purpose of automatic water conservancy diversion.Drainage sand 40 is as ladle bottom mouth of a river packing material, and it is can not sintering blocked up to require to meet under high temperature and long-time refined states the steel face, otherwise influences automatic casting ratio, thereby influences normal smelting operation.

Existing automatic casting plug such as China Patent No. 91231503.2 disclosed automatic casting apparatus, it can realize above-mentioned automatic casting, still, there is following deficiency in it:

1. after this casting apparatus was directly packed the mouth of a river into, top did not have filler to cover, and molten steel infiltrates slide plate from the gap location of filling tube and filling pipe end inwall easily, causes slide plate knot steel or bleed-out accident.

2. filling material in this casting apparatus is contained at ladle and can be produced the heat phenomenon that rises under the high temperature action of steel, makes inner stuffing compression scaffolding or outwards expands and squeeze broken cartridge.

3. be difficult for tamping during this casting apparatus filling material, washed away and the static pressure effect by molten steel high temperature, be subjected in the steel process brokenly easily at ladle, lose protective effect with regard to cartridge.

Summary of the invention

The purpose of this utility model is to provide a kind of ladle automatic casting plug, can effectively control the sinter layer thickness of drainage sand, alleviates the scaffold situation of bottom drainage sand simultaneously.In the moment of opening slide plate, rely on effects such as self gravitation and ferrostatic pressure to flow out rapidly down, thereby reach the purpose of guaranteeing the ladle automatic casting.

For achieving the goal, the technical solution of the utility model is, ladle automatic casting plug is arranged in the mouth of a river, and the body of this automatic casting plug is a club shaped structure, and it comprises core and shell, and core central authorities have centre bore; Described core is that refractory material is built and formed, and shell is a steel material.

Comprise steel fibre in the refractory material of described core.

Described outer casing bottom opening.

Described core upper end protuberance is when reducing automatic casting and the friction of drainage sand.

Described body diameter is less than mouth of a river internal diameter.

Described body core center-hole diameter is less than drainage sand particle diameter.

Automatic casting plug of the present utility model is gone into filling pipe end position (this moment, ladle was in the accumbency state) from the upper slide thruster when ladle dress slide gate nozzle, after slide gate nozzle installs ladle is holded up, and drainage sand is poured into filling pipe end and brick cup position from ladle top.Can effectively control the sinter layer thickness of drainage sand, alleviate the scaffold situation of bottom drainage sand simultaneously.In the moment of opening slide plate, rely on to open under the effects such as watering plug self gravitation and ferrostatic pressure (acting on drainage sand sinter layer top) and flow out rapidly, thereby realize the ladle automatic casting.

The beneficial effects of the utility model:

1, uses the utility model to need not anti-material of original ladle nozzle and mechanism are transformed, have good applicability, can be widely used in existing most of ladle nozzle mechanism.

2, fitting operation is very easy, can not increase work on the spot intensity.

3, it is favourable to carry out liquid steel refining under long-time to need especially, the condition of high temperature in ladle, can significantly improve automatic casting ratio in this case.

4, the utility model is dredged the ladle nozzle number of times with oxygen after can obviously having reduced cast; Continuous casting billet degradation rate is reduced, and the time of molten steel from the steel ladle pouring to the tundish shortens has improved continuous casting billet quality; Conticaster output increases, and the off-time reduces; The molten steel loss reduces, and recovery rate of iron improves.

5, the utility model can reduce because the anti-material scaling loss that oxygen causes is burnt at the mouth of a river, improves the continuous access times at the slide plate mouth of a river, reduces on-the-spot labour intensity and goods, materials and equipments cost.

Description of drawings

Fig. 1 is existing automatic casting plug schematic diagram;

Fig. 2 is the structural representation of the utility model automatic casting plug;

Fig. 3 is the vertical view of Fig. 2.

The specific embodiment

Referring to Fig. 2, Fig. 3, ladle automatic casting plug of the present utility model is arranged in the mouth of a river, and the body 1 of this automatic casting plug is a club shaped structure, and it comprises core 2 and shell 3, and core 2 central authorities have centre bore 21; Described core 2 is built for refractory material and is formed its upper end protuberance; Shell 3 is a steel material, its bottom opening 31.

Core 2 is built for refractory material and is formed, and central authorities reserve centre bore 21 during cast, and this bore dia is less than drainage sand particle diameter, and anti-material waters allocates steel fibre into to gain in strength and to improve own wt in the material feeding.Shell 3 is a steel material, has certain intensity, and core 2 can be inserted in the shell 3, requires core appearance and box hat smooth surface, to be inserted in post gap little.The whole diameter d of watering plug of opening should be slightly less than mouth of a river inside diameter D.

Water plug body 1 after cold conditions is packed ladle nozzle into when opening, owing to the self heat at the bottom of the ladle bag and the mouth of a river, steel casing 3 and core 2 can suitably expand; Then pour into drainage sand, fill the mouth of a river to full state to the mouth of a river; Bag end temperature can continue to raise after ladle was contained steel, because the box hat coefficient of expansion is greater than the anti-material of core, so core 2 breaks away from easily when watering opening; Simultaneously, because core 2 is provided with centre bore 21, therefore falls Shi Buhui and produce the head negative pressure at core 2; If box hat does not fall together, the molten steel that can be flowed into dissolves, and can select the box hat of unlike material for use according to the difference of producing steel grade.The maximum ga(u)ge h of drainage sand sinter layer depends on the length H of automatic casting plug.Because core 2 proportions less than molten steel, so can float at tundish behind the automatic casting, can not pollute molten steel.

The raising of ladle automatic free-opening rate can be optimized steel-smelting production process.Owing to burn the minimizing of oxygen drainage, reduced the secondary oxidation of molten steel, can realize the whole process protection casting, improve the cleanliness factor of molten steel greatly.Simultaneously, can make continuous casting production direct motion, reduce production accident owing to burn the minimizing of oxygen drainage procedure.

Claims

1. ladle automatic casting plug is arranged in the mouth of a river, it is characterized in that, the body of this automatic casting plug is a club shaped structure, and it comprises core and shell, and core central authorities have centre bore; Described core is that refractory material is built and formed, and shell is a steel material.

2. ladle automatic casting plug as claimed in claim 1 is characterized in that, comprises steel fibre in the refractory material of described core.

3. ladle automatic casting plug as claimed in claim 1 is characterized in that, described outer casing bottom opening.

4. ladle automatic casting plug as claimed in claim 1 is characterized in that, described core upper end protuberance.

5. ladle automatic casting plug as claimed in claim 1 is characterized in that described body diameter is less than mouth of a river internal diameter.

6. ladle automatic casting plug as claimed in claim 1 is characterized in that, described body core center-hole diameter is less than drainage sand particle diameter.