CN1126622C

CN1126622C - Refractory assembly

Info

Publication number: CN1126622C
Application number: CN99815430A
Authority: CN
Inventors: 文森特·布瓦代金
Original assignee: VESUVIRUS CURCIBLE CO
Current assignee: VESUVIRUS CURCIBLE CO
Priority date: 1999-01-06
Filing date: 1999-12-23
Publication date: 2003-11-05
Anticipated expiration: 2019-12-23
Also published as: AR022200A1; TW495401B; ATE223272T1; EP1148961B1; BR9916777A; EP1148961A1; DE69902824T2; CA2356350A1; CN1332660A; JP2002534267A; WO2000040358A1; KR20010089763A; AU755773B2; AU1851100A; DE69902824D1

Abstract

The invention concerns a refractory assembly for a device for regulating a pouring flow rate. Downstream from a pouring channel (7), it is comprised of at least two refractory plates (1, 2) perpendicular to one axis of the channel (Z-Z) and equipped with the respective orifices (10, 20). The device includes, upstream from the plates, means for injecting a fluid (F) capable of cooperating mechanically with the pouring (C). According to the invention, this injection is effected upstream from the plates and in an angular sector of the channel (7) less than 360 DEG , in the direction of displacement (X-X) of the sliding plate (1) toward its stop position.

Description

Refractory assembly

The present invention relates to be used in particular for regulate the device of the pouring flow rate of motlten metal casting equipment, this motlten metal is steel or cast iron for example.

The invention particularly relates to for example argon injection in the used refractory assembly in the adjusting device of the type of inert fluid.This fluid can cooperate with motlten metal machinery.

The device that is used to regulate flow has pouring channel, inserts two refractory plates that a hole is respectively arranged usually in the downstream of this pouring channel.These plates are basically perpendicular to the axis of this passage, and one of them plate can slide with respect to another plate towards a side of passage.At casting position, the basic and casting dead in line in the hole of sliding panel, and the respective aperture of plate is interconnected.On the other hand, in the position that casting stops, the hole of sliding panel and another plate depart from certain distance, and therefore, this two plate is closed their hole mutually.

In known adjusting device, injection device is arranged on the whole periphery of this passage usually, so that inject described fluid around the axis of this passage.The radially injection of fluid can obtain all even axisymmetric injection.

But, can make this sliding panel be displaced to centre position between described casting position and stop position with respect to another plate a little, so that the medium flow rate casting is provided or hangs down the flow velocity casting.Like this, this motlten metal will run into by the edge in the hole of sliding panel with respect to the axis of passage and the obstacle that forms.This causes this hole to be corroded usually.And in the recirculating zone of motlten metal, solid deposits can be formed at the edge in the hole on the sliding panel.

The present invention will improve this situation.

Therefore, the present invention relates to a kind of refractory assembly that is used for the adjusting device of described type, this refractory assembly has at least two refractory plates in the pouring channel downstream, and this refractory plate is basically perpendicular to the axis of this passage, and corresponding hole is arranged.One of them plate is designed to and can slides to the position that casting stops from casting position with respect to another plate towards a side of this passage, and at this casting position, corresponding hole is communicated with substantially, and at this casting stop position, this plate is closed their hole substantially mutually.This refractory assembly also has basic fluid injection device in this plate upstream, and this fluid can cooperate with motlten metal machinery, so that avoid the precipitation in described recirculating zone.

According to general characteristic of the present invention, this refractory assembly has an inwardly projecting orifice, and this nozzle becomes the cylindricality hollow shape substantially, and is positioned at the upstream of plate.The inwall of this nozzle defines described pouring channel.This injection device is designed to less than 360 ° segment angle and facing to substantially radially injecting fluid in the nozzle with respect to a side of this passage of this sliding panel when sliding panel is in the closed position.Like this, the fluid interference is injected by this in this motlten metal part, and in recirculating zone and wall mechanical isolation (even adiabatic).

Described segment angle preferably is less than or equal to about 270 °, so that concentrated this fluid flows and makes this fluid stream stronger in the motlten metal recirculating zone.For some purposes, this segment angle is preferably near 120 °.

According to a preferred feature of the present invention, inwardly projecting orifice has a recess in horizontal substantially part, the internal communication of this recess and pouring channel, and form segment angle crown less than 360 °.At this moment, fluid injects by this recess.

This recess preferably is equipped with the insert of a porous refractory, and wherein, fluid injects towards the inside of pouring channel.

By reading following detailed description and with reference to the accompanying drawings, can understand other advantage of the present invention and feature, in the accompanying drawing:

Fig. 1 is the partial schematic diagram of the vertical profile of the refractory assembly that is used for adjusting device of the present invention;

Fig. 2 is the sectional side elevation of the inwardly projecting orifice that installs according to the preferred embodiment of the invention;

Fig. 3 is the cross-sectional figure of nozzle shown in Figure 2.

Accompanying drawing and detailed description have subsequently comprised the element with certain character substantially.They can not only be used for understanding the present invention better, and help when needed to determine of the present invention.

At first with reference to figure 1, this figure illustrates the face of land to show to be used for the refractory assembly of the adjusting device of motlten metal casting (arrow C), especially in steel-making or metallurgical equipment.

The described refractory assembly of this embodiment has three refractory plates, and wherein a plate with label 1 expression can be sliding between two plates with

label

2 and 3 expressions in addition.These three plates 1,2 are stacked substantially with 3 and vertical with casting axis Z-Z, and this casting axis Z-Z is a vertical direction in described embodiment.In the upstream of plate been provided with internal refractories nozzle 4 is arranged, this designs of nozzles becomes at least that the part is positioned at tapping hole, and in described embodiment, this tapping hole has the diapire of continuous casting distributor (not shown).This inwardly projecting orifice 4 constitutes a part that makes the pouring channel that the casting distributor links to each other with the ingot mould of equipment.

The overall shape of inwardly projecting orifice 4 becomes hollow substantially cylindrical shape, and its inwall 43 (Fig. 2) has defined pouring channel 7.Especially, these nozzle 4 basic one-tenth conical butts.This pouring channel 7 is communicated with the hole 20 of upstream refractory plate 2.

In described embodiment, upstream plate 2 and downstream plate 3 are fixing with respect to inwardly projecting orifice 4, and intermediate plate 1 can slide (as shown in the figure, towards Fig. 1 right side) to the casting stop position from casting position.Like this, along horizontal axis X-X direction, this displacement can be regulated pouring flow rate substantially in the displacement in the hole 10 of slip intermediate plate 1.

In fact, when casting position, this hole 10 is communicated with the hole 20 of upstream plate 2, and is communicated with the hole 30 of downstream plate 3 on the other hand on the one hand.At the casting stop position, hole 10 is towards the skew of the right side of Fig. 1, and the part 11 near this hole 10 of refractory plate (Figure 1 shows that in the hole 10 left side) obviously closes the hole 20 of upstream plate 2 on the one hand and obviously closes the hole 30 of downstream plate 3 on the other hand.Like this, when the hole 10 of slip intermediate plate 1 along axis X-X during with respect to pouring channel 7 skews, pouring flow rate reduces, the position of this casting interruption when being in the extreme position of the stop position that is equivalent to cast when sliding panel 1.On the other hand, when the axis in hole 10 basic during with the casting dead in line, the pouring flow rate maximum.

When plate 1 mediated, motlten metal ran into first barrier corresponding to the upper wall portion 11 in the close hole 10 of sliding panel 1.Plate 2 and 1

respective aperture

20 and 10 be skew each other obviously, forms basic crooked pouring trajectory C.Metal is stagnated in the zone 6 that is called as " backflow dead band ".For example, in the metallurgical equipment of motlten metal, the solid deposits of aluminium oxide and solidified steel may form in zone 6, and may disturb moving of sliding panel 1, even blocks the hole 20 of upstream plate 2.

Ideal situation is to inject the fluid that can cooperate with motlten metal machinery, so that produce the lining of local turbulence and/or protection nozzle wall, so that hinder sedimental formation.This fluid is not chosen as can produce chemical reaction with motlten metal.In fact, inert gas injecting argon for example.

In known adjusting device, this injection is normally carried out around casting axis Z-Z.Be provided with circular port, so that injecting gas radially around the whole 360 ° of extensions of pouring channel.But, this axial symmetry injects and can not solve because the problem that interior backflow in zone 6 and consequent deposition produce.

The fluid that an object of the present invention is to provide a kind of part injects, and this fluid can cooperate with motlten metal machinery, so that restriction even the motlten metal of elimination in described regional 6 reflux.

According to a preferred embodiment of the invention, this inwardly projecting orifice 4 wall 43 within it has a recess 40, and this recess 40 extends on less than 360 ° segment angle at one, and is in the plane that is basically perpendicular to nozzle-axis Z-Z.The insert of being made by porous refractory 5 is positioned at this recess; Inert gas injects this insert (arrow F).Being flowing in the zone 6 that may produce deposition of injecting gas produces local turbulence, and protects this wall by forming adiabatic gas-bearing formation.

Preferably, in described embodiment, the segment angle that the recess 40 of inwardly projecting orifice 4 is extended approaches 120 ° (Fig. 3).Especially, this recess 40 on the cross section of nozzle (Fig. 3) becomes segment angle A less than 270 ° crown or ring-type, is near 120 ° in the present embodiment.

As shown in Figure 2, inwardly projecting orifice 4 has a circular trough 41, is used for the fluid from external lug 46 is supplied to injection region 5 always.These groove 41 parts extend into the hole 42 that is communicated with recess 40, and gas injects (arrow F) by this hole.Gas F is by being introduced in the aperture of insert 5 with the center of guiding passage 7 near 120 ° segment angle in transverse plane substantially.

Like this, local fluid is injected with to be beneficial to and makes it can limit even prevent formation deposit in zone 6, especially, and when pouring trajectory curves inwardly and sliding panel 1 mediates (Fig. 1) and when defining pouring flow rate less than maximum stream flow substantially.

Certainly, the present invention is not limited to the described mode of front embodiment.The present invention also extends to other version.

Another form of implementation is included in settles a metal tube in the nozzle body, and external lug 46 is directly linked to each other with groove 41.

Should also be appreciated that the injection of fluid also can be by in the plane that is arranged in the axis that is basically perpendicular to nozzle 4 and be arranged in less than a plurality of holes on 360 ° of (for example near 120 °) segment angle zones and carry out.Become in the example at one, according to general characteristic of the present invention, nozzle 4 has groove in the plane that is basically perpendicular to its axis Z-Z, and this groove extends in less than 360 ° segment angle zone.

For the passage area that can comprise the motlten metal recirculating zone, the injection of fluid is carried out in both cases.This backflow mainly is formed at facing toward on the side of side 45 (Fig. 1) of passage, and plate 1 slides to its casting stop position towards this side 45 from its casting position.

Should know, in United States Patent (USP) 4632283, disclosed refractory assembly has the injection device in upstream plate 2, so that by with respect to the sliding panel 1 that is in the casting stop position in far-end (20 the left side of plate 2 in the hole, a part as shown in Figure 1) and inject fluid, thus stream primary orientation will be injected on the moving direction of sliding panel 1.But, there is the upstream plate 2 of this injection device to need the surperficial boss (also being horn mouth) that has around its hole 20 thereon.This boss have groove, a plurality of hole or even be useful on the porous insert that injects fluid, this boss extends towards inwardly projecting orifice, its main height is along casting axis Z-Z, so that realize effective injection of fluid.Bottom at nozzle also needs corresponding recess, so that hold this boss.

The applicant also is surprised to find that, motlten metal nozzle flow internally upstream during plate 2 also through the heat loss.This boss is high more, and heat loss is big more.Like this, too high boss causes that solid deposits forms on intermediate plate 1, and this is exactly opposite with United States Patent (USP) 4632283 desirable effects.According to the present invention, fluid injects from nozzle can limit this heat loss.

Can also on refractory assembly of the present invention, equip a middle sliding panel 1 that has porous refractory insert and second injection device (arrow F '), the direction that this second injection device slides to its casting position from its casting stop position along plate 1 (among Fig. 1 from right to left), so that eliminate since metal on the upper surface portion 31 in the close hole 30 of downstream plate 3 right side of hole 30 (as shown in Figure 1) backflow and the deposition that may cause.This second injection device preferably extends in less than 360 ° segment angle zone.

In addition, porous insert or other arbitrarily the fluid injection device also can be positioned at downstream plate 3 and, below sliding panel and in the zone in its tapping hole left side, produce backflow so that prevent facing to a side of sliding panel 1 closed position.

In described embodiment, this refractory assembly has three stacked refractory plates, and one of them plate is that intermediate plate can slide between two other plate.Become in the example at one, two refractory plates 1 and 2 are only arranged in nozzle 4 downstreams.At this moment Xia Mian plate 1 is designed to and can slides towards a side 45 of passage with respect to plate 2.This sliding panel 1 be usually located at fixed head 2 below, and main fluid always injects from a side relative with side 45 of passage and carries out, sliding panel 1 is shifted to its casting stop position towards this side 45 from its casting position.

In another change example of refractory assembly of the present invention, inwardly projecting orifice 4 and upstream plate 2 are made by single monolithic refractory spare.

Inwardly projecting orifice 4 is the refractory material members of a part that are generally the upper area of refractory assembly, and this refractory assembly is designed to make continuous casting distributor to link to each other with the ingot mould of casting equipment.Become in the example at one, this nozzle can be a part that makes the refractory assembly that casting ladle links to each other with distributor, or makes the part of the refractory assembly that electric furnace links to each other with casting ladle.

Claims

1. used refractory assembly of device that in metallurgy or steelmaking equipment, is used for regulating pouring flow rate, this refractory assembly has two refractory plates (1 at least in pouring channel (7) downstream, 2), this refractory plate is perpendicular to passage axis (Z-Z), and each have corresponding hole (10,20), one of them plate (1) is designed to and can slides to the position that casting stops from casting position with respect to another plate (2) towards a side (45) of this passage, at this casting position, each hole (10,20) be communicated with, at this casting stop position, this plate (1,2) close their hole (10 mutually, 20), this device also has injection device (5), so that fluid (F) can cooperate with motlten metal (C) machinery, this injection device (5) is designed in less than 360 ° passage (7) segment angle and injects fluid (F) facing to this passage with respect to the side (45) of the sliding panel that is in stop position (1), so that fluid (F) is oriented along sliding panel (1) from its casting position the direction (X-X) that moves to its casting stop position, it is characterized in that: this injection device (5) is positioned at the part of pouring channel (7) and at this plate (1,2) upstream.

2. assembly according to claim 1, it is characterized in that: it has an inwardly projecting orifice (4), this inwardly projecting orifice (4) becomes hollow cylinder form, and swim by refractory material onboard and make, simultaneously, this injection device (5) is designed in less than 360 ° segment angle and radially fluid (F) is injected described nozzle.

3. assembly according to claim 2, it is characterized in that: this inwardly projecting orifice has a recess (40) in horizontal part, this recess is communicated with inner pouring channel (7), and forming segment angle (A) crown less than 360 °, this injection device (5) is designed to injection fluid in this recess (40).

4. assembly according to claim 3 is characterized in that: described recess (40) is designed to be equipped with a porous refractory insert (5).

5. according to any one described assembly in the claim 1 to 4, it is characterized in that: this inwardly projecting orifice has a horizontal groove (41), this groove extends on the circumferential part of nozzle, and this injection device (5) is designed to inject fluid (F) at least a portion of this groove (41) simultaneously.

6. according to any one described assembly in the claim 1 to 4, it is characterized in that: this inwardly projecting orifice has at least one hole (42), the radial direction of this Kong Zaiguan is extended, and is parallel to the moving direction of sliding panel, and this injection device (5) is designed to inject fluid (F) in this hole (42) simultaneously.

7. assembly according to claim 6 is characterized in that: described hole (42) are designed to comprise the metal tube that can supply with this fluid (F).

8. according to any one described assembly in the claim 1 to 4, it is characterized in that: described segment angle (A) is less than or equal to 270 °.

9. assembly according to claim 8 is characterized in that: described segment angle (A) is near 120 °.

10. according to any one described assembly in the claim 1 to 4, it is characterized in that: at least one plate (1,2,3) comprises porous refractory in the part at least, and the porous part of at least a portion slave plate of fluid (F, F ') injects.

11., it is characterized in that: this inwardly projecting orifice (4) and directly forming by single monolithic refractory spare at the plate (2) in this nozzle downstream according to any one described assembly in the claim 1 to 4.

12. according to any one described assembly in the claim 1 to 4, it is characterized in that: this fluid (F) comprises argon.