EP0790091B1 - Sliding plate for opening and closing the outlet of a casting vessel containing molten metal, as well as a process for repairing the same - Google Patents

Abstract

Closure plate for opening and closing the taping hole of a vessel consists of a contact plate (10) located inside a steel frame (14) which has a tubular section (16) tapering at it's lower end and having step (28) which allows a steel cap (27) to be placed over it. The area between the steel frame and plate is filled with refractory material, including the flange section (15) under the plate (10).

Description

The invention relates to a slide plate for opening and Closing the outlet channel of a casting vessel for metallic Melting, according to the preamble of claim 1.

Furthermore, the present invention relates to methods for Repair of such a slide plate.

In Figures 1 to 3 is a known slide plate in Longitudinal section (Figure 1), in plan view (Figure 2) and in one enlarged partial section (Figure 3) shown. This Slider plate is used to open and close the outlet channel a casting vessel for metallic melts in assignment to a head plate not shown here on the Bottom of the watering can. The slide plate is in Figure 1 marked with the reference number 10. It includes an upper one Sliding surface 11 and one arranged on the underside, namely molded spout 12, one made of refractory (FF) material existing pipe section 13 and one itself over the bottom and at least part of the side Edge of the slide plate extending and from one Steel frame 14 bordered, also made of FF material existing flanch 15 includes. The outer peripheral surface of the Pipe section 13 is through a steel frame 14 mentioned subsequent steel jacket 16 limited. Furthermore defined the pipe section 13 at the lower outlet end a cone 17. The Steel jacket 16 is connected to the steel frame 14 by a Weld 18 in the transition area between pipe section 13 and flange 15 connected. In the slide plate 10 is one central outlet opening 19 in the form of a corresponding bore educated. This is aligned with a continuous one Central bore 20 in the flange 15 and pipe section 13 of the Pouring spout 12.

Before a used slide plate of the known type is repaired, their plate thickness is checked. Of the deflection of the plate is also checked. Finally, slide plates tend to move during the Expanding operation radially with the result that the External dimensions of the plate must be measured.

Then the slide plate is drilled out with training an annular seat 21 around the outlet opening 19. Then the pouring spout is drilled out with training a central bore 22. After completing this work a replacement ring 23 is placed in the ring seat 21 of the slide plate 10 made of slide plate material and by means of a suitable Mortar glued. The final fixation takes place within a kiln in which the adhesive mortar hardens. Then the sliding surface 11 of the slide plate 10 including replacement ring 23 ground. Then in the a spike defined by the replacement ring 23 inserted in such a way that it extends centrally through the bore 22 extends through the pouring spout 12. The gap between the aforementioned mandrel and the bore 22 delimiting Area is filled with FF material. In another The firing process involves hardening of the casting compound mentioned forming an FF sleeve fixed within the bore 22 24. After removing or pulling off the aforementioned casting mandrel is that protruding over the lower edge of the steel jacket 16 FF material cleaned, especially deburred and possibly made to measure ground. A slide plate repaired in this way is shown in FIG 5 shown. With this repair it is not necessary surrounding the pipe section 13 of the pouring spout 12 Remove steel jacket 16.

If the slide plate is heavily worn, it is very common required, the entire pipe section 13 of the pouring spout 12 to replace. In this case, the pipe section 13 must be complete Steel jacket 16 can be tapped. After that, a new one Steel jacket welded to the steel frame 14 (see from below Herein accessible ring weld 25 in Figure 4). After then in the slide plate 10 of the already mentioned replacement ring 23 in the has been used in the manner described above a spike defined by the replacement ring 23 inserted in such a way that it is centrally located through the Replacement steel jacket 16 'extends through. After that, FF material in the space between thorn and Spare steel jacket 16 'cast in. After curing this The casting mandrel is pulled off the material and this over the lower one Edge of the replacement steel jacket 16 'projecting FF material cleaned and if necessary ground to size. You get then a repair slide plate, as shown in Figure 4 is shown schematically. This repair slide plate is characterized in that at the bottom of the Slider plate 10 molded flange made of FF material largely preserved. The same applies to the flange 15 steel frame 14.

The repair slide plate according to FIG. 5 does not only remain the flange 15 including the steel frame 14, but also still a large part of the pipe section 13 and the surrounding Steel jacket 16.

The aforementioned repair steps are therefore divided into the following subsections: - Check plate thickness - visual inspection - Check the deflection of the sliding surface - Check the external dimensions - Drill ring seat - Drilling the pouring spout, if necessary, parting off the pipe section including the steel jacket and welding on a replacement steel jacket - Rework the weld seam between the steel frame and the steel jacket - Glue in the replacement ring - Hardening of the adhesive connection between slide plate and replacement ring - Grinding the sliding surface of the slide plate and replacement ring - Pouring the pouring spout as a whole or the inner outlet sleeve - removal of the casting mandrel Total repair time T1

or T2> T1, (if pipe section including steel jacket is cut off and must be replaced completely), where T1 is about 70% of T2 is.

The present invention is based on the described prior art, as he is currently practicing is based on the task of creating a slide plate, which is considerable compared to the conventional slide plates is easier to repair. Furthermore, it is the job of present invention, much less time consuming To provide repair procedures, especially in Connection with the new slide plate.

With regard to the slide plate, the task is solved by the features of claim 1. The Claims 2 and 3 relate to preferred constructive Details of the slide plate according to the invention.

Two considerably fewer compared to the prior art elaborate repair procedures are in claims 4 and 5 described, wherein in the method according to claim 4 the entire ceramic is replaced by a new one, while the The method of claim 5, the original slide plate only in the area of the outlet opening is repaired by insert a replacement ring made of slide plate material.

The peculiarity of the new slide plate is that which at the lower outlet end of the pipe section of the Spout-shaped cone limiting steel jacket one this interchangeable steel cap extending downward. This makes it possible to repair the lower one for the purpose Remove the steel jacket from the outlet end of the pouring spout. This will squeeze the ceramic out of the steel frame and the remaining part of the steel jacket is considerably easier. It should also be borne in mind that the outer peripheral surface on Outflow end of the spout a particularly high wear is exposed. This would normally be an exchange of the the tubular section of the spout surrounding steel jacket have as a consequence. Thanks to the steel cap according to the invention is a such a total exchange is not necessary. It takes only the steel cap to be replaced.

The steel jacket preferably has one in the region of the cone extending to the extent to which the interchangeable steel cap can be connected flush.

Because of the steel cap according to the invention, it is also possible the steel frame surrounding the flange of the pouring spout as well as limiting the pipe section of the pouring spout To connect the steel jacket in one piece or to train.

Figur 1

Eine herkömmliche Schieberplatte im Längsschnitt;

Figur 2

Die Schieberplatte gemäß Figur 1 in Draufsicht;

Figur 3

Einen Teil der herkömmlichen Schieberplatte im Schnitt Längslinie A-A bzw. B-B in Figur 2 in vergrößertem Maßstab;

Figur 4

Eine nach einem ersten herkömmlichen Reparaturverfahren reparierte Schieberplatte gemäß Stand der Technik im Längsschnitt;

Figur 5

Eine nach einem weiteren herkömmlichen Reparaturverfahren reparierte Schieberplatte gemäß Stand der Technik im Längsschnitt,

Figur 6

Eine erfindungsgemäß ausgebildete Schieberplatte im Längsschnitt;

Figur 7

Einen einstückig ausgebildeten Stahlrahmen samt Stahlmantel im Längsschnitt;

Figur 8

Nach einem ersten erfindungsgemäßen Verfahren reparierte Schieberplatte, die erfindungsgemäß ausgebildet ist, im Längsschnitt.

An embodiment of a slide plate according to the invention is described in more detail below with the aid of the attached drawing and preferred repair methods using such a slide plate. Show it:

Figure 1

A conventional slide plate in longitudinal section;

Figure 2

The slide plate according to Figure 1 in plan view;

Figure 3

Part of the conventional slide plate in section along line AA or BB in Figure 2 on an enlarged scale;

Figure 4

A slide plate repaired according to a first conventional repair method according to the prior art in longitudinal section;

Figure 5

A slide plate repaired according to another conventional repair method according to the prior art in longitudinal section,

Figure 6

A slide plate designed according to the invention in longitudinal section;

Figure 7

A one-piece steel frame with steel jacket in longitudinal section;

Figure 8

Slider plate repaired according to a first method according to the invention, which is designed according to the invention, in longitudinal section.

The conventional slide plate according to Figures 1 to 3 and the conventional repair methods are shown in FIG. 1 to 5 already described.

In contrast, the slide plate is distinguished according to the figures 6 and 7 characterized in that the flange 15 and lateral Edge of the slide plate 10 enclosing steel frame 14 and surrounding the pipe section 13 of the pouring spout 12 Steel jacket 16 are integrally connected. This one-piece training is particularly good in Figure 7 recognizable. Instead of one-piece training, it is the same conceivable, the steel jacket 16 over a closed Ring weld seam to the edge of the bottom of the steel frame 14 trained opening to connect.

Furthermore, the novel slide is characterized by that the at the lower outlet end of the pipe section 13th trained cone 17 delimiting steel jacket 16 this one downwardly extending interchangeable steel cap 27. The Steel cap 27 is designed in the manner of a truncated cone. Specifically, the steel jacket 16 has one in the region of the cone 17 extending around the perimeter 28 to which the exchangeable steel cap 27 can be connected flush. Accordingly, a consistently smooth exterior Circumferential surface also in the transition area between steel jacket 16 and steel cap 26 created.

• Entfernen der Stahlkappe 27 am unteren Auslaufende des Rohrabschnitts 13 des Ausgußstutzens 12;
• Auspressen der Schieberplatte 10 samt Ausgußstutzen 12, d. h. samt angeformtem Flansch 15 und Rohrabschnitt 13 aus dem den Flansch 15 begrenzenden Stahlrahmen 14 und dem den Rohrabschnitt 13 umgebenden Stahlmantel 16; dieses Auspressen erfolgt in Figur 6 in Richtung nach oben;
• Bohren einer Auslauföffnung 19 in eine Ersatzplatte;
• Einsetzen der gebohrten Ersatzplatte in den vorhandenen, d. h. gebrauchten Stahlrahmen und Fixieren derselben innerhalb eines Mörtelbetts so, daß die Oberseite der Ersatzplatte über den oberen Rand des Stahlrahmens 14 vorsteht; das erwähnte Fixieren im Mörtelbett erfolgt innerhalb eines Brennofens;
• Schleifen der Oberseite der Ersatzplatte auf Maß;
• Einsetzen eines Dorns in die Auslauföffnung 19 der geschliffenen Ersatzplatte so, daß sich dieser zentral durch den die äußere Umfangsfläche des Rohrabschnitts 13 des Ausgußstutzens 12 definierenden Stahlmantel 16 hindurcherstreckt;
• Aufsetzen einer neuen oder gebrauchten Stahlkappe 27 auf den konischen Endabschnitt 26 des die äußere Umfangsfläche des Rohrabschnitts 13 des Ausgußstutzens 12 definierenden Stahlmantels 16;
• Ausgießen des Zwischenraums zwischen Dorn und Stahlmantel mit FF-Material;
• Aushärten des FF-Materials zwischen Dorn und Stahlmantel 16 unter erhöhter Temperatur, nämlich im Brennofen;
• Abziehen des Dorns sowie Säubern des über den unteren Rand der Stahlkappe 27 vorstehenden FF-Materials.

A first repair process using the slide described is characterized by the following process steps:

• Removing the steel cap 27 at the lower outlet end of the pipe section 13 of the pouring spout 12;
• Pressing the slide plate 10 together with the pouring spout 12, ie together with the integrally formed flange 15 and pipe section 13 from the steel frame 14 delimiting the flange 15 and the steel jacket 16 surrounding the pipe section 13; this pressing takes place in FIG. 6 in the upward direction;
• Drilling an outlet opening 19 into a replacement plate;
• Inserting the drilled replacement plate into the existing, ie used steel frame and fixing it within a mortar bed so that the top of the replacement plate protrudes over the upper edge of the steel frame 14; the aforementioned fixing in the mortar bed takes place within a kiln;
• Grinding the top of the replacement plate to size;
• Inserting a mandrel into the outlet opening 19 of the ground replacement plate so that it extends centrally through the steel jacket 16 defining the outer peripheral surface of the pipe section 13 of the pouring spout 12;
• Placing a new or used steel cap 27 on the conical end section 26 of the steel jacket 16 defining the outer peripheral surface of the pipe section 13 of the pouring spout 12;
• Pouring the space between the mandrel and the steel jacket with FF material;
• Curing the FF material between mandrel and steel jacket 16 at elevated temperature, namely in the kiln;
• Pulling off the mandrel and cleaning the FF material projecting over the lower edge of the steel cap 27.

The time required for this type of repair is T3, with T3 is approximately 55-70% of T1 and approximately 40-50% of T2.

• Entfernen der Stahlkappe 27 am unteren Auslaufende des Rohrabschnitts 13 des Ausgußstutzens 12;
• Bohren eines Ringsitzes 21 um die Auslauföffnung 19 der Platte 10 herum, wobei der Innendurchmesser des Ringsitzes 21 größer bemessen wird als der Innendurchmesser des den Rohrabschnitt 13 des Ausgußstutzens 12 umgebenden Stahlmantels 16;
• Auspressen des Rohrabschnitts 13 aus dem diesen umgebenden Stahlmantel 16 durch den in der Platte 10 gebohrten Ringsitz 21 hindurch;
• Einsetzen eines die Auslauföffnung der Platte 10 definierenden Rings 23 in den ausgebohrten Ringsitz 21 der Platte 10 unter Zwischenschaltung eines Klebemörtels;
• Aushärten des Klebemörtels unter erhöhter Temperatur im Brennofen;
• Schleifen der Gleitfläche 11 der Platte samt eingesetztem Ring 23;
• Einsetzen eines Dorns in die Ringöffnung so, daß sich dieser zentral durch den die äußere Umfangsfläche des Rohrabschnitts 13 des Ausgußstutzens 12 definierenden Stahlmantel 16 hindurcherstreckt.
• Aufsetzen einer neuen oder gebrauchten Stahlkappe 27 auf den konischen Endabschnitt 26 des die äußere Umfangsfläche des Rohrabschnitts 13 des Ausgußstutzens 12 definierenden Stahlmantels 16;
• Ausgießen des Zwischenraums zwischen Dorn und Stahlmantel mit FF-Material;
• Aushärten des FF-Materials zwischen Dorn und Stahlmantel unter erhöhter Temperatur im Brennofen;
• Abziehen des Dorns sowie Säubern des über den unteren Rand der Stahlkappe 27 vorstehenden FF-Materials.

A second type of repair is explained in more detail below with reference to FIG. 8. This repair process is characterized by the following process steps:

• Removing the steel cap 27 at the lower outlet end of the pipe section 13 of the pouring spout 12;
• Drilling an annular seat 21 around the outlet opening 19 of the plate 10, the inside diameter of the annular seat 21 being larger than the inside diameter of the steel jacket 16 surrounding the pipe section 13 of the pouring spout 12;
• Pressing the pipe section 13 out of the steel jacket 16 surrounding it through the ring seat 21 drilled in the plate 10;
• Inserting a ring 23 defining the outlet opening of the plate 10 into the drilled ring seat 21 of the plate 10 with the interposition of an adhesive mortar;
• Curing the adhesive mortar under elevated temperature in the kiln;
• Grinding the sliding surface 11 of the plate together with the inserted ring 23;
• Inserting a mandrel into the ring opening so that it extends centrally through the steel jacket 16 defining the outer peripheral surface of the tubular section 13 of the pouring spout 12.
• Placing a new or used steel cap 27 on the conical end section 26 of the steel jacket 16 defining the outer peripheral surface of the pipe section 13 of the pouring spout 12;
• Pouring the space between the mandrel and the steel jacket with FF material;
• Curing of the FF material between the mandrel and the steel jacket under elevated temperature in the kiln;
• Pulling off the mandrel and cleaning the FF material projecting over the lower edge of the steel cap 27.

The time required for this repair procedure is T4, where T4 is approximately 60-75% of T1 and approximately 45-55% of T2.

The above time expenditure ratios show very well that the repair procedure for a slide according to FIG. 6 or 8 take significantly less time than that Repair of a conventional slide plate in a conventional one Wise.

Business management is much easier and easier less time-consuming repair is of great importance. Here must be considered that slide plates wear a lot subject to repairs and therefore have to be repaired accordingly often, before they are replaced by a new slide plate. Under Using the new slide plate, the Reduce repair times considerably. The one in the outer outline about a truncated cone-shaped steel cap serves as a protective shield for the cone at the lower outlet end of the pouring spout or Pouring sleeve. This area of the slide plate or The pouring spout is a relatively high wear exposed; Accordingly, it is important to use means for To provide a quick and affordable Allow repairs without major intervention on the slide The steel cap described provides such a means represents.

As can be seen very well in FIG. 7, the wall thickness of the Steel frame 14 slightly larger than the wall thickness of the Steel jacket 16.

Reference symbol list:

10th

Slide plate

11

Sliding surface

12th

Pouring spout

13

Pipe section

14

Steel frame

15

flange

16

Steel jacket

17th

cone

18th

Ring weld seam

19th

Outlet opening

20th

drilling

21

Ring seat

22

drilling

23

Spare ring

24th

Refractory sleeve

25th

Ring weld seam

16 '

Replacement steel jacket

27

Steel cap

28

Ring step

Claims (5)

1. Slide plate for opening and closing the outlet channel of a casting vessel for metallic melts, comprising an upper glide surface (11) and on the bottom side a discharge socket (12), encasing a pipe section (13) of fireproof material as well as a flange (15), which extends over the bottom side and at least part of the lateral edge of the slide plate (10) and is encased by a steel frame (14) and also made of fireproof material, and the outer peripheral surface of the pipe section (13) is defined by a steel casing (16) adjacent the aforementioned steel frame (14) and defines a cone (97) at the lower discharge end of the pipe section (13), characterised in that the steel casing (16), which defines the cone (17) configured on the lower discharge end of the pipe section (13), encases its downwardly extending exchangeable steel cap (27).
2. Slide plate according to Claim 1, characterised in that the steel casing (16) comprises in the area of the cone (17) a peripherally extending step (28) to which the exchangeable steel cap (27) can be positively connected.
3. Slide plate according to Claim 1 or 2, characterised in that the steel frame (14), which encloses the flange (15), and the steel casing (16), which defines the tubular section (13), are joined together by integration.
4. Process of repairing a slide plate according to one of Claims 1 to 3, characterised by the following procedural stages:

   a) removal of the steel cap (27) at the lower discharge end of the pipe section (13) of the discharge socket (12);

   b) pushing out the slide plate (10) including discharge socket (12), i.e. including integrated flange (15) and pipe section (13) from the steel frame (14) which defines the flange (15) and the steel casing (16) which encases the pipe section (13);

   c) drilling a discharge opening (19) into a replacement plate;

   d) insertion of the drilled replacement plate into the available, i.e. previously used, steel frame (14) and fixing (baking) it within a mortar bed in such a manner that the top of the replacement plate protrudes over the upper edge of the steel frame (14);

   e) grinding the top of the replacement plate to measure;

   f) insertion of a mandrel into the discharge opening (19) of the ground replacement plate in such a manner that it extends centrally through the steel casing (16) which defines the outer peripheral surface of the pipe section (13) of the discharge socket (12);

   g) fitting a new or used steel cap (27) onto the conical end section (17) of the steel casing (16) which defines the outer peripheral surface of the pipe section (13) of the discharge socket (12);

   h) filling the intermediate space between mandrel and steel casing (16) with fireproof material;

   i) curing (baking) the fireproof material between mandrel and steel casing at increased temperature; and

   j) drawing off the mandrel as well as cleaning the fireproof material which projects over the lower edge of the steel cap (27).
5. Process for repairing a slide plate according to one of Claims 1 to 3, characterised by the following procedural stages:

   a) removal of steel cap (27) at the lower discharge end of the pipe section (13) of the discharge socket (12);

   b) drilling an annular seat (21) around the discharge opening (19) of the slide plate (10), and the inside diameter of the annular seat (21) is greater than the inside diameter of the steel casing (16) which encases the pipe section (13) of the discharge socket (12);

   c) pushing the pipe section (13) out of its surrounding steel casing (16) through the annular seat (21) drilled into the plate (10);

   d) inserting a ring (23) which defines the discharge opening of the plate (10) into the drilled out annular seat (21) of the plate (10) with adhesive mortar placed thereinbetween;

   e) curing the adhesive mortar at increased temperature (baking);

   f) grinding the glide surface (11) of the slide plate (10) including inserted ring (23);

   g) inserting a mandrel into the annular opening in such a manner that it extends centrally through the steel casing (16) which defines the outer peripheral surface of the pipe section (13) of the discharge socket (12);

   h) fitting a new or used steel cap (27) onto the conical end section (17) of the steel casing (16) which defines the outer peripheral surface of the pipe section (13) of the discharge socket (12);

   i) filling the space between mandrel and steel casing with fireproof material;

   j) curing (baking) the fireproof material between mandrel and steel casing at increased temperature;

   k) drawing off the mandrel and cleaning the fireproof material which projects over the lower edge of the steel cap (27).

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