EP0307346B1 - Link for rotary sliding gate - Google Patents
Link for rotary sliding gate Download PDFInfo
- Publication number
- EP0307346B1 EP0307346B1 EP19880730199 EP88730199A EP0307346B1 EP 0307346 B1 EP0307346 B1 EP 0307346B1 EP 19880730199 EP19880730199 EP 19880730199 EP 88730199 A EP88730199 A EP 88730199A EP 0307346 B1 EP0307346 B1 EP 0307346B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sealing ring
- valve closure
- slide valve
- plate
- closure according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000007789 sealing Methods 0.000 claims description 51
- 239000002184 metal Substances 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 3
- 238000007373 indentation Methods 0.000 claims 1
- 239000000155 melt Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 229910001338 liquidmetal Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000289 melt material Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 235000011837 pasties Nutrition 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
- B22D41/26—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings characterised by a rotatively movable plate
Definitions
- the invention relates to a rotary slide closure for a pouring vessel provided with a bottom pouring opening, with a bottom plate fastened to the bottom of the vessel and with a sliding plate rotatably and pivotably arranged thereon, both plates being provided with refractory elements and with one arranged between the bottom and sliding plate at right angles to the pouring opening Sealing ring.
- a leakage-preventing arrangement for a rotary slide closure in which a sealing ring is arranged, which is arranged concentrically to the axis of rotation of the slide plate and which is in contact with one another Surfaces of the two plates formed seals.
- the sealing ring is arranged once on the outer circumference of both plates and, in another embodiment, is provided in the form of an annular groove between the two plates. Both embodiments have the disadvantage that the ring has an insufficient mass, which is not able to cool the melt. The result of this is that when only small amounts of molten material exit, the sealing ring is melted and cannot perform its sealing function.
- the sealing rings known from this document also have the disadvantage that they cannot compensate for changes in the geometry of the slide plates during operation. Between the idle state and the operating state, the slide is subject to high temperature differences, which lead to geometric changes in the slide that are larger than the required size of the readjustment capability of the sealing element.
- the object of the invention is to increase the operational reliability of the generic rotary slide valve closure, to extend its service life and to prevent liquid melt from escaping from the slide valve.
- this object is achieved by an annular chamber which is delimited by the sealing ring, the base plate and the slide plate, and the seal ring which has a sealing surface on the side facing the slide plate and an elastic sealing element on the side facing the base plate is provided between the sealing ring and the base plate.
- the sealing ring is arranged between the base plate and the slide plate at a distance from the refractory lining.
- the sealing ring is supported at least by its own weight on the slide plate.
- the support surface is designed so that the dead weight is sufficient to prevent the formation of gaps. This ensures a secure seal against possible leakage of melt material.
- This contact pressure is further supported by the elastic sealing element arranged on the side of the sealing ring facing the base plate. V-shaped rings can advantageously be used here.
- Both seals, the sealing lip and the V-shaped sealing ring, enable a gas-tight shut-off, which remains effective even with major changes in the valve geometry. In the majority of cases this prevents the gap from reaching a size from which liquid metal can escape.
- liquid metal is pressed from the spout through the sealing gap between the refractory linings of the base plate and the slide plate, it flows into the chamber provided according to the invention within the rotary slide valve closure.
- the outflowing jet of melt hits the sealing ring and then flows into the cavity formed by the base plate, the slide plate and the sealing ring.
- the mass of the components surrounding the chamber has a cooling capacity which is sufficient to extract enough heat from the melt that it becomes viscous to pasty.
- the existing cooling ability of the slide elements and the sealing ring with its sufficient mass are reinforced by the shape of the sealing ring.
- the metal jet when it emerges from the sealing surfaces between the ff plates, strikes the conical shape of the inner surface of the sealing ring, which increases concentrically to the outside. This ensures that the metal jet is distributed only in one plane perpendicular to the pouring opening. The consequence of this is that the largest possible surface area of the plates and the sealing ring come into contact with the melt and can dissipate heat.
- the size of the chamber and the sealing ring is designed according to the invention depending on the required heat dissipation from the melt material.
- the slide plate advantageously has a nose with a shape which is designed such that the sealing ring cannot fall out when the slide is opened.
- the casting vessel 10 (not shown) has a metallic pan base 11 with a bottom pouring opening 12.
- the bottom plate 21 is arranged in a stationary manner on this pan bottom 11.
- the slide plate 22 is pressed against the base plate 21 by means of springs (not shown).
- the slide plate 22 is rotatable via the toothed ring 24 and the axis I and is thereby mounted on the ball bearing 23.
- the refractory linings 27, 28 are fastened to the plates 21, 22 by means of holding elements 25, 26.
- the slide plate 22 has an annular nose 29 which corresponds in its contour to that of the sealing ring 30.
- the sealing ring 30 is arranged in the form that parts of the plates 21, 22 and the sealing ring 30 form a chamber 40.
- the sealing ring 30 has a sealing surface 31 which is supported on the slide plate 22.
- the concentric inner surface of the sealing ring 30 has a double-conical shape, the lower half 32 and the upper half 33 of the inner surface 36 having the largest diameter at the level of the sealing surfaces of the refractory lining 27, 28.
- An elastic sealing element 35 is arranged in the area of the head surface 34.
- the elastic sealing element 35 is a metallic ring 37 which has a V-shaped shape.
- the V-shaped ring 37 is arranged in a bulge 38 of the sealing ring 30.
- the nose 29 and the bulge 38 have such a shape that when the slide plate 22 is opened, the sealing ring 30 and the elastic sealing element 35 cannot fall out of the rotary slide 20.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Description
Die Erfindung betrifft einen Drehschieberverschluß für ein mit einer Bodenausgußöffnung versehenes Gießgefäß, mit einer an dem Gefäßboden befestigten Bodenplatte und einer zu dieser verdrehbar und schwenkbar angeordneten Schieberplatte, wobei beide Platten mit Feuerfestelementen versehen sind und mit einem zwischen der Boden- und Schieberplatte rechtwinklig zur Ausgußöffnung angeordneten Dichtring.The invention relates to a rotary slide closure for a pouring vessel provided with a bottom pouring opening, with a bottom plate fastened to the bottom of the vessel and with a sliding plate rotatably and pivotably arranged thereon, both plates being provided with refractory elements and with one arranged between the bottom and sliding plate at right angles to the pouring opening Sealing ring.
Aus der DE-PS 24 04 881, von der der Oberbegriff des Anspruchs 1 ausgeht, ist eine Leckage verhindernde Anordnung für einen Drehschieberverschluß bekannt, bei dem ein Dichtring angeordnet ist, der zu der Drehachse der Schieberplatte konzentrisch angeordnet ist und die zwischen den aneinander berührenden Flächen der beiden Platten gebildeten Spalt verschließt. Dabei ist der Dichtring einmal am Außenumfang beider Platten angeordnet und in einer anderen Ausführungsform in Form einer Ringnut zwischen beiden Platten vorgesehen. Beiden Ausführungsformen haftet der Nachteil an, daß der Ring jeweils eine zu geringe Masse aufweist, die nicht in der Lage ist, eine Abkühlung der Schmelze zu bewirken. Die Folge davon ist, daß beim Austritt auch von nur geringen Mengen schmelzflüssigen Materials der Dichtring aufgeschmolzen wird und seine Dichtfunktion nicht erfüllen kann.From DE-PS 24 04 881, from which the preamble of claim 1 is based, a leakage-preventing arrangement for a rotary slide closure is known, in which a sealing ring is arranged, which is arranged concentrically to the axis of rotation of the slide plate and which is in contact with one another Surfaces of the two plates formed seals. The sealing ring is arranged once on the outer circumference of both plates and, in another embodiment, is provided in the form of an annular groove between the two plates. Both embodiments have the disadvantage that the ring has an insufficient mass, which is not able to cool the melt. The result of this is that when only small amounts of molten material exit, the sealing ring is melted and cannot perform its sealing function.
Die aus dieser Schrift bekannten Dichtringe haben darüber hinaus den Nachteil, daß sie Veränderungen der Geometrie der Schieberplatten während des Betriebes nicht ausgleichen können. Zwischem dem Ruhezustand und dem Betriebszustand ist der Schieber hohen Temperaturunterschieden unterworfen, die zu geometrischen Veränderungen des Shiebers führen, die größer sind als die erforderliche Größe der Nachstellfähigkeit des Dichtelementes.The sealing rings known from this document also have the disadvantage that they cannot compensate for changes in the geometry of the slide plates during operation. Between the idle state and the operating state, the slide is subject to high temperature differences, which lead to geometric changes in the slide that are larger than the required size of the readjustment capability of the sealing element.
Im Gießbetrieb hat sich gezeigt, daß durch den Gießstrahl der Schmelze bei leichten Undichtigkeiten zwischen den Feuerfestelementen des Drehschiebers Luft angesaugt werden kann, entsprechend dem Prinzip der Wasserstrahlpumpe. Die mitgerissene Luft hat zum einen den Nachteil, daß Sauerstoff + Stickstoff in unerwünschter Menge vom Gießstrahl des fließenden Metalls aufgenommen wird, zum anderen führt es auch zur Zerstörung des Feuerfestmaterials durch die schmirgelnde Wirkung von mitgerissenem Staub sowie durch die Abkühlung der Oberfläche der Feuerfestelemente. Die Folge davon ist, daß der Spalt, der bislang nur gasdurchlässig war, eine Vergrößerung erfährt, aus der das Flüssigmetall ausströmen kann. Die aus der o. g. Patentschrift bekannt gewordene Abdichtung bietet hiergegen keinen ausreichend ausdauernden Schutz.In the casting operation it has been shown that air can be sucked in by the pouring stream of the melt in the event of slight leaks between the refractory elements of the rotary slide valve, in accordance with the principle of the water jet pump. The entrained air has the disadvantage, on the one hand, that oxygen + nitrogen is absorbed in an undesirable amount by the pouring jet of the flowing metal, on the other hand, it also leads to the destruction of the refractory material by the abrasive effect of entrained dust and by the cooling of the surface of the refractory elements. The consequence of this is that the gap, which was previously only gas-permeable, is enlarged, from which the liquid metal can flow out. The from the above On the other hand, seal that has become known does not offer sufficiently long-lasting protection.
Aufgabe der Erfindung ist es, die Betriebssicherheit des gattungsgemäßen Drehschieberverschlusses zu erhöhen, seine Standzeit zu verlängern und das Austreten flüssiger Schmelze aus dem Schieber zu verhindern.The object of the invention is to increase the operational reliability of the generic rotary slide valve closure, to extend its service life and to prevent liquid melt from escaping from the slide valve.
Gemäß der Erfindung wird diese Aufgabe gelöst durch eine ringförmige Kammer, die von dem Dichtring, der Bodenplatte und der Schieberplatte begrenzt wird, und dem Dichtring, der auf der der Schieberplatte zugewandten Seite eine Dichtfläche und auf der der Bodenplatte zugewandten Seite ein elastisches Dichtelement, das zwischen dem Dichtring und der Bodenplatte vorgesehen ist, aufweist.According to the invention, this object is achieved by an annular chamber which is delimited by the sealing ring, the base plate and the slide plate, and the seal ring which has a sealing surface on the side facing the slide plate and an elastic sealing element on the side facing the base plate is provided between the sealing ring and the base plate.
Der Dichtring ist zwischen der Bodenplatte und der Schieberplatte im Abstand zur Feuerfestauskleidung angeordnet. Der Dichtring stützt sich mindestens durch sein Eigengewicht auf der Schieberplatte ab. Die Abstützfläche ist dabei so ausgebildet, daß das Eigengewicht ausreicht, eine Spaltbildung zu verhindern. Damit wird ein sicheres Abdichten gegen mögliches Ausfließen von Schmelzmaterial bewirkt. Diese Anpreßkraft wird noch unterstützt durch das auf der der Bodenplatte zugewandten Seite des Dichtringes angeordnete elastische Dichtelement. In vorteilhafter Weise sind hier V-förmige Ringe einsetzbar.The sealing ring is arranged between the base plate and the slide plate at a distance from the refractory lining. The sealing ring is supported at least by its own weight on the slide plate. The support surface is designed so that the dead weight is sufficient to prevent the formation of gaps. This ensures a secure seal against possible leakage of melt material. This contact pressure is further supported by the elastic sealing element arranged on the side of the sealing ring facing the base plate. V-shaped rings can advantageously be used here.
Beide Dichtungen, die Dichtlippe und der V-förmige Dichtring, ermöglichen eine gasdichte Absperrung, die auch bei größeren Veränderungen der Schiebergeometrie wirkungsvoll bleibt. In der überwiegenden Zahl der Fälle wird dadurch verhindert, daß der Spalt eine Größe erreicht, aus der flüssiges Metall austreten kann. Wird aber dennoch flüssiges Metall vom Ausguß her durch den Dichtspalt zwischen den Feuerfestauskleidungen der Bodenplatte und der Schieberplatte gedrückt, so strömt dieses in die erfindungsgemäß innerhalb des Drehschieberverschlusses vorgesehene Kammer. Der ausströmende Strahl der Schmelze trifft gegen den Dichtring und strömt danach in den Hohlraum, der gebildet wird von der Bodenplatte, der Schieberplatte und dem Dichtring. Die Masse der die Kammer umschließenden Bauteile hat eine Abkühlkapazität, die ausreicht, der Schmelze soviel Wärme zu entziehen, daß sie dickflüssig bis teigig wird.Both seals, the sealing lip and the V-shaped sealing ring, enable a gas-tight shut-off, which remains effective even with major changes in the valve geometry. In the majority of cases this prevents the gap from reaching a size from which liquid metal can escape. However, if liquid metal is pressed from the spout through the sealing gap between the refractory linings of the base plate and the slide plate, it flows into the chamber provided according to the invention within the rotary slide valve closure. The outflowing jet of melt hits the sealing ring and then flows into the cavity formed by the base plate, the slide plate and the sealing ring. The mass of the components surrounding the chamber has a cooling capacity which is sufficient to extract enough heat from the melt that it becomes viscous to pasty.
Die vorhandene Abkühlfähigkeit der Schieberelemente und des Dichtringes mit seiner ausreichenden Masse werden noch verstärkt durch die Formgebung des Dichtringes. Der Metallstrahl trifft, wenn er aus den Dichtflächen zwischen ff-Platten austritt, auf die konzentrisch nach außen sich vergrößerende konische Form der Innenfläche des Dichtringes. Dadurch wird erreicht, daß der Metallstrahl ausschließlich einer Ebene senkrecht zur Ausgußöffnung sich verteilt. Die Folge davon ist, daß eine möglichst große Oberfläche der Platten und des Dichtringes mit der Schmelze in Kontakt treten und Wärme abführen können. Die Größe der Kammer und des Dichtringes ist erfindungsgemäß ausgelegt in Abhängigkeit der erforderlichen Wärmeabfuhr aus dem Schmelzenmaterial.The existing cooling ability of the slide elements and the sealing ring with its sufficient mass are reinforced by the shape of the sealing ring. The metal jet, when it emerges from the sealing surfaces between the ff plates, strikes the conical shape of the inner surface of the sealing ring, which increases concentrically to the outside. This ensures that the metal jet is distributed only in one plane perpendicular to the pouring opening. The consequence of this is that the largest possible surface area of the plates and the sealing ring come into contact with the melt and can dissipate heat. The size of the chamber and the sealing ring is designed according to the invention depending on the required heat dissipation from the melt material.
Die Schieberplatte weist in vorteilhafter Weise eine Nase auf mit einer Form, die so ausgestaltet ist, daß vom Öffnen des Schiebers der Dichtring nicht herausfallen kann.The slide plate advantageously has a nose with a shape which is designed such that the sealing ring cannot fall out when the slide is opened.
Eine bevorzugte Ausführungsform der Erfindung wird in der folgenden Figur erläutert. Es zeigt:
- Figur 1
- einen Ausschnitt eines Drehschiebers.
- Figure 1
- a section of a rotary valve.
Das (nicht dargestellte) Gießgefäß 10 besitzt einen metallischen Pfannenboden 11 mit einer Bodenausgußöffnung 12. An diesem Pfannenboden 11 ist die Bodenplatte 21 stationär angeordnet. Gegen die Bodenplatte 21 wird die Schieberplatte 22 mittels (nicht dargestellter) Federn gepreßt. Die Schieberplatte 22 ist über den Zahnkranz 24 u die Achse I drehbar und dabei auf dem Kugellager 23 gelagert. An den Platten 21, 22 sind die Feuerfestauskleidungen 27, 28 mittels Halteelemente 25, 26 befestigt. Die Schieberplatte 22 weist dabei eine ringförmige Nase 29 auf, die in ihrer kontur der des Dichtringes 30 entspricht. Zwischen der Bodenplatte 21 und der Schieberplatte 22 ist der Dichtring 30 angeordnet und zwar in der Form, daß Teile der Platten 21, 22 und der Dichtring 30 eine Kammer 40 bilden. Der Dichtring 30 weist eine Dichtfläche 31 auf, die sich auf der Schieberplatte 22 abstützt. Die konzentrische Innenfläche des Dichtringes 30 besitzt eine doppelkonische Form, wobei die untere Hälfte 32 und die obere Hälfte 33 der Innenfläche 36 in Höhe der Dichtflächen der Feuerfestauskleidung 27, 28 den größten Durchmesser hat. Im Bereich der Kopffläche 34 ist ein elastisches Dichtelement 35 angeordnet. Im Ausführungsbeispiel ist das elastische Dichtelement 35 ein metallischer Ring 37, der eine V-förmige Form aufweist. Der V-förmige Ring 37 ist in einer Ausbuchtung 38 des Dichtringes 30 angeordnet.The casting vessel 10 (not shown) has a metallic pan base 11 with a bottom pouring opening 12. The
Die Nase 29 und die Ausbuchtung 38 weisen eine solche Form auf, daß beim Aufklappen der Schieberplatte 22 der Dichtring 30 wie auch das elastische Dichtelement 35 nicht aus dem Drehschieber 20 herausfallen können.The
Claims (8)
- Rotary slide valve closure for a casting vessel (10) provided with a pouring outlet (12) at the bottom and having a bottom plate (21) attached to the bottom (11) of the vessel and a slide plate (22) arranged rotatably and pivotally with respect to this, wherein both plates (21,22) have fireproof elements (27,28) and a sealing ring (30) arranged coaxially to the pouring outlet (12) between the bottom plate (21) and the slide plate (22), characterized in that the inner surface of the sealing ring (30), the bottom plate (21) and the slide plate (22) define an annular chamber (40), in that the sealing ring (30) has a sealing surface (31) on the side facing the slide plate (22), and in that an elastic sealing element (35) is provided on the side facing the bottom plate (21) between the sealing ring (30) and the bottom plate (21).
- Rotary slide valve closure according to claim 1, characterized in that the ratio of the cross-sectional areas of the chamber (40) and the sealing ring (30) does not exceed 0.8.
- Rotary slide valve closure according to claim 2, characterized in that the inside width of the sealing ring (30) increases from the outer edges towards the middle, whereby the smallest diameter is positioned in the region of the plane of the contacting surfaces of the bottom plate (21) and the slide plate (22).
- Rotary slide valve closure according to claim 3, characterized in that, on the side facing the bottom plate (21), the slide plate (22) has an annular lug (29) which, on its side surface facing the sealing ring (30), has a shape corresponding to the inverse shape of the region (32) of the inner surface (36) facing away from the furnace.
- Rotary slide valve closure according to claim 4, characterized in that, for the purposes of assembly, the diameter of the slide plate (22), in the area of the lug (29), is less than the internal diameter of the sealing ring (30).
- Rotary slide valve closure according to claim 5, characterized in that the elastic sealing element (35) is a metal ring.
- Rotary slide valve closure according to claim 6, characterized in that the metal ring has an outwardly-opening, V-shaped appearance.
- Rotary slide valve closure according to claim 7, characterized in that the V-shaped ring (37) is arranged in an indentation (38) of the sealing ring (30).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3731021 | 1987-09-11 | ||
DE19873731021 DE3731021A1 (en) | 1987-09-11 | 1987-09-11 | RING FOR TURNOVER LOCK |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0307346A2 EP0307346A2 (en) | 1989-03-15 |
EP0307346A3 EP0307346A3 (en) | 1990-05-16 |
EP0307346B1 true EP0307346B1 (en) | 1992-08-26 |
Family
ID=6336088
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880730199 Expired - Lifetime EP0307346B1 (en) | 1987-09-11 | 1988-09-05 | Link for rotary sliding gate |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0307346B1 (en) |
JP (1) | JPH0199772A (en) |
DE (1) | DE3731021A1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU37533A1 (en) * | 1959-06-15 | |||
CH523730A (en) * | 1970-05-25 | 1972-06-15 | Interstop Ag | Slide gate on container for liquid melt |
JPS5127409B2 (en) * | 1973-02-12 | 1976-08-12 |
-
1987
- 1987-09-11 DE DE19873731021 patent/DE3731021A1/en active Granted
-
1988
- 1988-09-05 EP EP19880730199 patent/EP0307346B1/en not_active Expired - Lifetime
- 1988-09-09 JP JP22633188A patent/JPH0199772A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
JPH0199772A (en) | 1989-04-18 |
DE3731021C2 (en) | 1990-01-25 |
EP0307346A3 (en) | 1990-05-16 |
DE3731021A1 (en) | 1989-03-23 |
EP0307346A2 (en) | 1989-03-15 |
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