WO2009033633A1

WO2009033633A1 - Refractory ceramic adaptor

Info

Publication number: WO2009033633A1
Application number: PCT/EP2008/007350
Authority: WO
Inventors: Patrick Seitz; Stefan Pischek; Ulf Andersson
Original assignee: Refractory Intellectual Property Gmbh & Co. Kg
Priority date: 2007-09-15
Filing date: 2008-09-09
Publication date: 2009-03-19
Also published as: DE102007044126A1

Abstract

The invention relates to a refractory ceramic well block/well nozzle. A well block/well nozzle of this type is used, for example, for bordering (framing) a gas purging block or a nozzle block in the wall or bottom region of metallurgical melting and treatment vessels.

Description

FIRE-RESISTANT CERAMIC ADAPTER

Description

The invention relates to a refractory ceramic perforated stone (English: well block, well nozzle). Such a perforated brick is used, for example, for enclosing (framing) a gas purging plug or a pouring plug in the wall or bottom area of metallurgical melting and treatment vessels.

Gasspülsteine usually have a truncated cone shape, the narrow end is in the operating position above. Accordingly, the opening in the perforated brick into which the gas purging plug is inserted is conical in section, the narrow end being in the functional position at the top. A perforated brick for receiving an outlet sleeve can be used above a slide closure system. Basically linear slides are distinguished by rotary valves. Within these groups there are so-called 2-plate gate valve systems and gate valve systems with more than 2 plates.

In the case of 2-plate linear slides, the lower slide plate in the casting direction of a molten metal is linearly displaced to open and close the closure system.

For example, in block casting (chill casting), it is known to extend the lower slide plate of a pan slider in the casting direction of the molten metal with an outlet sleeve, which projects into an associated casting funnel, which is associated with the mold.

To open the slide, therefore, the pan must first be raised to lift the spout of the lower slide plate over the sprue. Then the lower slide plate can be moved and the slide lock can be opened. At this moment, the melt starts to leak through the slide closure. This requires that the pan be moved over the mold in the shortest possible time so that the outlet sleeve of the lower slide plate is again arranged concentrically to and in the pouring funnel.

The movement of the pan (or the slide closure) relative to the mold (or their casting funnel) is difficult. Often, molten metal can not be prevented from splashing around. Therefore, an additional splash guard is often attached to the slider.

To replace a 2-plate gate valve with a 3-plate gate valve, in which the middle plate is moved, solves the problems mentioned, but complicates and increases the cost of the gate closure system considerably.

The invention has for its object to offer a solution to the above problem.

The basic idea of the invention consists of arranging a kind of "adapter" between slide closure and subsequent assemblies (for example the mentioned casting funnel) .This adapter can be arranged stationary, for example on a pouring funnel The adapter is designed such that it has a pouring channel The special feature of the adapter is that the inlet end of the pouring channel has a larger cross-sectional area in relation to the outlet end of the pouring channel.

This makes it possible to horizontally displace the outflow sleeve of the lower slide plate projecting in the casting direction of the melt during the linear movement of the slide plate along the enlarged pouring channel, without having to lift the associated treatment vessel, for example a pan. It follows: The inlet end of the pouring channel is designed so that an outlet sleeve of a corresponding slide plate in the pouring channel - in the flow direction of a molten metal - immerse (protrude) and perpendicular to the flow direction of the molten metal (quasi horizontal) can be moved in the pouring channel. The cross-sectional area of the pouring channel at the inlet end may be more than twice the cross-sectional area at the outlet end. This value can also be> 2.3 or> 2.5 or> 2.7.

Another advantage is that melt that runs out through the open slide closure can run directly into the pouring channel of the adapter without having to move the metallurgical melting vessel again. At the same time the danger is significantly reduced that molten metal splashes around.

Since the adapter has a similar shape to a perforated stone mentioned at the outset, it will be referred to below as refractory ceramic perforated brick.

In that regard, the invention relates in its most general embodiment of a refractory ceramic perforated brick with a pouring channel extending from an upper, inlet side end through the perforated brick to a lower, outlet side end, wherein the inlet end opposite the outlet end has a larger cross-sectional area.

As explained above, the perforated brick will usually be aligned so that the casting channel axis runs vertically in the functional position of the perforated brick. According to one embodiment, the outlet-side end of the pouring channel is formed concentrically to the casting channel axis. Usually, the discharge-side end (the discharge-side end portion) of the pouring channel will have a circular cross-section.

The larger cross-sectional area of the inlet-side end of the pouring channel can likewise have a circular shape which runs concentrically with the pouring-canal axis. In this case, the associated slide shutter in the X-Y direction along a horizontal plane can be moved arbitrarily.

However, the displacement direction of the slide is regularly fixed, so that an eccentrically extending to Gießkanalachse cross-sectional area for the inlet end of the pouring channel offers, for example in the form of an ellipse, an oval. In this case, one end of the oval can be designed in alignment with the outlet-side end of the pouring channel.

Due to the different cross-sectional geometries at the inlet side and outlet end of the pouring channel, it necessarily follows that the wall of the pouring channel can not run parallel to the casting direction of the melt everywhere.

According to one embodiment, it is provided to form the pouring channel in the transition region from the inlet end (end portion) to the outlet end (end portion) step-shaped.

In terms of flow, it is advantageous to form a sloping inclined surface instead of a step, wherein the slope is inclined in the direction of the outlet end of the pouring channel. The stone can be positioned in many different ways. It can be provided a separate scaffolding. For the mentioned application of chill casting, it makes sense to put the perforated stone on the casting funnel. In this context, an embodiment of the invention, the lower end face of the perforated brick, adjacent to the outlet end of the pouring channel, form with a circumferential recess, which is preferably designed form-fitting manner to the peripheral region of the casting funnel, so that there is a secure fit.

The perforated brick consists of a conventional ceramic refractory material. Typical dimensions are:

Width: 25 to 75 cm, especially 30 to 60 cm

Length: 25 to 75 cm, especially 30 to 60 cm Height: 10 to 50 cm, especially 15 to 30 cm.

Instead of a parallelepiped shape, the perforated brick can also have a cylindrical peripheral surface whose diameter then moves in the order of magnitude of the width and length of the aforementioned cuboid.

In addition, a splash guard can be provided. This is for example attached to the slide plate and moved with this.

The splash guard can also be provided on the perforated brick (on the circumference). It consists for example of a sheet metal.

Other features of the invention will become apparent from the features of the claims and the other application documents. In the region of the pouring channel, an inert gas supply can take place. Structurally, a channel may be provided in the refractory material of the pebble, which is fed with inert gas at one location and has one or more openings (or branches with openings) in the pouring channel wall through which the gas flows into the molten metal.

The prior art and the invention are explained below with reference to exemplary embodiments. Showing:

FIG. 1 shows a two-plate slide closure on a ladle with a downstream casting funnel as part of a mold casting installation (in longitudinal section)

Figure 2: a system analogous to Figure 1 with a perforated brick according to the invention.

FIG. 3 shows a plan view of the perforated brick of FIG. 2.

FIG. 1 shows the state of the art.

In Fig. 1, reference numeral 10 denotes a bottom of a ladle, to the spout 12 of which is connected a 2-plate gate system consisting of an upper fixed plate 14 and a lower plate 16 movable in the direction of arrow L. The lower plate 16 is extended downwardly around its flow opening 18 (in the casting direction of the melt) with a spout 20. Below the slide plate 16 is an upper end of a mold casting plant to recognize, in particular an associated sprue 22 with a funnel-shaped inlet opening 24, to which a pouring channel 26 connects.

To bring the slide system from the illustrated closed position to a position in which the through holes 18 of the plates 14, 16 are aligned, the ladle 10 must be raised in the direction of arrow G to the spout 20 of the slide plate 16 from the funnel-shaped opening 24 (dashed lines shown Position). Only now, in the designed with solid lines position, the slide plate 16 can be moved in the direction of arrow L.

So that the molten metal can then flow into and through the pouring funnel 22, the ladle has to be displaced and lowered in parallel, so that the melt can then flow vertically into the pouring funnel 22 via the spout 12, the slide plates 14, 16.

Figure 2 shows a perforated brick 30 according to the invention, which is placed on the sprue 22.

The perforated brick 30 has a pouring channel 32 which has an upper, inlet-side end 32o and a lower, outlet-side end 32u. The pouring channel 32 extends from an upper end face 34 o to a lower end face 34 u of the perforated brick 30.

As shown in FIG. 2, the upper, inlet-side end portion 32 o of the pouring channel 32 is formed with a larger (horizontal) cross-sectional area than the lower end portion 32 u, which has a circular cross-sectional area, concentric with the casting axis A. upper portion of the pouring channel 32 extends an annular gas line 38 in the refractory material. Stub lines 38s extend radially from the gas line 38 in the direction of the pouring channel 32. The stub lines 38s open into the pouring channel wall. The gas supply takes place via a connection region 38a.

At the upper end of the pouring channel 32 has an oval cross-sectional area, as can be seen in Figure 3. In this case, the (right) wall of the pouring channel 32 indicated by the reference numeral 32w extends continuously from the inlet end 32o to the outlet end 32u, while in the extended inlet side region 32o spaced from the upper end surface 34o a step 32s is formed, which is in the direction of the outlet side End 32u is inclined.

In order to enable a secure fit of the perforated block 30 on the pouring funnel 22, the perforated brick in the region of its lower end face 34u has a recess 40 running concentrically with the pouring channel 32, which positively receives an upper end of the pouring funnel 22.

It is readily apparent that the spout 20 of the slide plate 16 along the upper inlet end 32o of the pouring channel 32 in the linear direction (arrow L) can be moved without having to raise the ladle 10.

The pan can also remain in the same position during the opening of the slide and need not be tracked. The ratio of the cross-sectional areas of the pouring channel at the top and bottom is 2.2: 1. Assuming that the outlet nozzle 20 of the lower slide plate 16 has a cross-sectional area and shape that corresponds to that of the pouring channel 32 at the lower end 32u, the result for the outlet nozzle 20 is a maximum displacement V (Figure 3) within the inlet end of the Gießkanals 32, which corresponds approximately to 1, 2 times the diameter of the pouring channel 32 at the lower end 32u. This value (V) should correspond to> 1 and for example 1, 1 to 2.5 times the diameter of the pouring channel 32 at the lower end or the diameter of the outlet nozzle 20.

The aforementioned splash guard can be attached to the slide plate or other parts of the slide system and carried.

For sealing between the pan or slide system and perforated brick, the upper end face of the perforated brick can be provided with a seal, for example a fiber mat.

The centering of the perforated brick on a sprue can also be done via tongue and groove connections, centering pin (s) and corresponding receiving holes.

Claims

Patent claims

A refractory ceramic perforated brick (30) having a pouring channel (32) extending from an upper, inlet-side end (32o) through the perforated brick (30) to a lower, outlet-side end (32u), the inlet-side end (32o) opposite the outlet end (32u) has a larger cross-sectional area.

2. perforated brick according to claim 1 with a functional position of the perforated brick (30) vertically extending casting channel axis (A).

3. perforated brick according to claim 1 with a concentric to the casting channel axis (A) extending outlet side end (32u) of the pouring channel (32).

4. perforated stone according to claim 1 with an eccentric to the sprue (A) extending inlet end (32u) of the pouring channel (32).

5. perforated brick according to claim 1, the pouring channel (32) at the outlet end (32u) has a circular cross-section.

6. perforated brick according to claim 1, the pouring channel (32) at the inlet end (32o) has an oval cross-sectional area.

7. perforated brick according to claim 1, wherein the pouring channel (32) in the transition region from the inlet end (32 o) to the outlet end (32 u) is stepped.

8. Perforated brick according to claim 1, wherein the pouring channel (32) in the transition region from the inlet end (32o) to the outlet end (32u) with an outlet end (32u) inclined inclined surface (32s) is formed.

9. perforated brick according to claim 1, the lower end face (34u), adjacent to the outlet end (32u) of the pouring channel (32) has a circumferential recess (40).

10. Perforated brick according to claim 1 having a gas channel extending in the refractory material (38), which is connectable at least one point (38 a) to a gas supply and at at least one point (38 s) in a wall of the pouring channel (32) opens.