EP0372098B1 - Lance holder for a compact lance - Google Patents

Lance holder for a compact lance Download PDF

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Publication number
EP0372098B1
EP0372098B1 EP88120123A EP88120123A EP0372098B1 EP 0372098 B1 EP0372098 B1 EP 0372098B1 EP 88120123 A EP88120123 A EP 88120123A EP 88120123 A EP88120123 A EP 88120123A EP 0372098 B1 EP0372098 B1 EP 0372098B1
Authority
EP
European Patent Office
Prior art keywords
lance
valve disc
holder
valve
oxygen
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
Application number
EP88120123A
Other languages
German (de)
French (fr)
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EP0372098A1 (en
Inventor
Wolfram Dipl.-Ing. Aschemann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beda Oxygentechnik Armaturen GmbH
Original Assignee
Beda Oxygentechnik Armaturen GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Beda Oxygentechnik Armaturen GmbH filed Critical Beda Oxygentechnik Armaturen GmbH
Priority to DE88120123T priority Critical patent/DE3885616D1/en
Priority to EP88120123A priority patent/EP0372098B1/en
Priority to AT88120123T priority patent/ATE97167T1/en
Priority to TR300/89A priority patent/TR23539A/en
Priority to KR1019890006966A priority patent/KR930011669B1/en
Priority to AU36498/89A priority patent/AU611571B2/en
Priority to US07/373,876 priority patent/US5131636A/en
Priority to CA000605280A priority patent/CA1336539C/en
Publication of EP0372098A1 publication Critical patent/EP0372098A1/en
Application granted granted Critical
Publication of EP0372098B1 publication Critical patent/EP0372098B1/en
Priority to SG76494A priority patent/SG76494G/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C21C5/462—Means for handling, e.g. adjusting, changing, coupling

Definitions

  • the invention relates to a lance holder for an oxygen lance with a large diameter, with a clamping head which fixes the lance and a slag return safety device arranged in the holder body between the lance and oxygen hose, which is designed as a valve which is pressed into the valve seat when slag penetrates as a result of fuses destroyed thereby.
  • Lance holders with a corresponding clamping head and a slag return safety device serve to hold the lance required for freshening securely and, on the other hand, not to let slag returning when the blowing process ends or is interrupted, until it reaches oxygen.
  • DE-C 2 327 595 is assigned a gas-permeable sintered metal disc just before the oxygen hose, which is intended to prevent the slag return. This mechanical shut-off of the slag return does not meet the demands placed on it where larger amounts of oxygen have to be enforced, because a sintered metal disc then naturally leads to difficulties.
  • the valve arrangement arranged in front of the gas-permeable disk represents a second slag return safety device, this valve closing when the seal arranged above is burnt due to a slag return.
  • slag return safeguards consisting of valve cones which can be displaced relative to one another, the corresponding valve cone being pressed into the sealing surface via a fuse which melts when it comes into contact with the slag, in order to prevent the flow of the slag and at the same time the further flow of oxygen. It is disadvantageous that problems also occur here if the lance is released from the lance holder by mistake or by being pushed, as a result of which the oxygen flowing out is struck loaded lance holder and hose end comes. There is a risk to the operators. Particularly in the case of lances with a large diameter, the lance may inadvertently fall out due to the great weight of the lance and inadequate fixation by the clamping head and thus endanger the manner described above.
  • the invention has for its object to safely prevent the dangerous hitting of the lance holder equipped with a slag return safety device and hose when the lance slipped out of the lance holder.
  • the slag backflow preventer is preceded by a valve disk which, with the inserted lance, is designed to be displaceable against the force of a spring and, for this purpose, a buffer sleeve known per se projecting in the direction of the lance and adapted to the lance diameter and against a narrowing of the inner bore , has oblique sealing surfaces.
  • a spiral compression spring is arranged between the buffer sleeve connected to the valve disk and the upper edge of the constriction. This design ensures that the lance is inserted exactly centered in the direction of the valve disk when it is inserted through the clamping head, so that the valve disk is also pushed out evenly from its sealing position.
  • the spiral compression spring which is cleverly part of the actual buffer sleeve, ensures that the valve disc is not pushed back further than absolutely necessary. Rather, the operator notices very quickly when inserting the lance that he has shifted the valve disc and thus opened the supply for the oxygen in preparation.
  • the size of the buffer sleeve is somewhat shorter than the corresponding recess or inner bore in the holder body, so that a corresponding signal is sent to the operator by the corresponding push.
  • the spiral compression spring also prevents the valve disc from tilting due to its safe guidance. The connection of the buffer sleeve and the valve disc ensures that the valve disc always sits securely, since it is loaded by two springs.
  • the invention provides that the valve disk and the buffer sleeve are releasably connected to one another by screws.
  • the valve disk as such can be inserted into the holder body from one side while the actual one Buffer sleeve is inserted from the other side.
  • a secure arrangement and position is then immediately secured by the connection via the screws, the valve disk being loaded via the spring which is supported on or on a circlip and at the same time via the spiral compression spring.
  • the corresponding screws can be easily reached and loosened or tightened from the outside.
  • the buffer sleeve has radial, large diameter wall recesses at the level of the valve disc that extend approximately to the upper edge of the constriction.
  • the gas can thus flow with the slag return valve arranged behind the valve disk open and past it and past the valve disk and the buffer sleeve into the buffer sleeve and through it through the lance in order to reach the melt in a guided manner.
  • the invention is characterized in particular by the fact that a very secure securing device for lance holders, covering all eventualities, is created, wherein optimization is advantageously achieved by the multiple securing device.
  • a compact lance is achieved which, due to the skillful arrangement and assignment of the individual valves and terminations, has a very short and small diameter, but which above all also works very safely.
  • the lance holder (1) shown in FIG. 1 is one with which lances having a relatively large diameter are to be held in order to be connected to the oxygen hose in this way.
  • the lance holder (1) has a tubular, elongated holder body (2), the upper end of which forms the clamping head (3) and the lower end of which forms the rear part (4) which is required for connection to the oxygen hose.
  • the slag return safety device (5) is accommodated within the tubular holder body (2) and will be explained in more detail later.
  • the hose is connected to the screw connection (6).
  • the collet is designated, via which the corresponding inserted tube or lance is fixed on and in the lance holder (1).
  • the O-ring (8) seals upwards.
  • a grub screw is designated, while (10) is the sealing sleeve, in which a seal (11) is housed, which when the lance is drawn in or pushed in, takes care of the necessary sealing, so that oxygen cannot flow past the side of the lance.
  • (12) is the pressure sleeve and (13) the threaded ring, with the latter and the clamping piece (14) and the lever (15) causing the lance holder (1) to be clamped in this way to make the lance holder (1) and To connect lances with each other.
  • a valve disc (18) is arranged approximately in the middle of the lance holder (1), via which, when the lance is not inserted, the passage of the lance holder (1), ie its inner bore (23), is closed, as shown in FIG. 1.
  • the valve disc (18) is loaded by a spring (19) so that, as mentioned, it then seals in the sealing seat when a lance is not inserted.
  • the valve disc (18) is connected to a buffer sleeve (20) and can be detached via screws (31) in order to move the valve disc (18) through the inserted lance.
  • valve disk (18) is brought out of contact with the sealing surface (21) via the buffer sleeve (20) pushed the constriction (22). Sealing surface (21) and shoulder (24) are then no longer in contact, so that the oxygen gas coming from below can flow past here without difficulty.
  • Fig. 2 clarifies that both the sealing surface (21) and the shoulder (24) have appropriate bevels in order to achieve a flat seal in this way.
  • the buffer sleeve (20) is correspondingly fitted into the inner bore (23), an area being created in which the buffer (29) of the buffer sleeve (20) acts on the upper edge (28) of the constriction (22) when through the inserted lance is intended to open the valve disc (18) accordingly.
  • the buffer (29) is designed here as a spiral compression spring (30) which ensures that when the buffer sleeve (20) is inserted, the operator recognizes in good time that the lance is inserted sufficiently far into the lance holder (1) due to increasing resistance is.
  • the spring (19) of the valve disc (18) is supported on the valve disc (18) opposite side on a circlip (32).
  • the circlip is visible in both FIG. 1 and FIG. 2. It is in a ring shape Recess inserted in the housing.
  • wall recesses (33, 34) are made in the wall of the buffer sleeve (20) in order to facilitate the flow of oxygen or the flow into the interior of the lance.
  • the wall recesses (33, 34) have a large cross section in order to be able to pass sufficient quantities of oxygen gas through them.
  • Screen grub screw (35) is fixed in a conical screen via a solder joint (36).
  • the solder joint (36) is designed and dimensioned such that when slag occurs, the sieve grub screw (35) is loosened so that the valve cone (38), which can be seen in FIG. 1, snaps into the corresponding sealing seat.
  • the conical sieve (37) ensures that the slag is initially stopped, at least until the soldering point (36) is destroyed and the valve is thus closed.
  • the valve cone (38) is loaded by the spring (39), which is supported on the inner part of the slag return safety device (5).
  • This slag return safety device (5) has a guide (40) for the valve cone (38), on which the free end (41) of the sieve grub screw (35) acts from the other side and from the inside the centering pin (43) which fits into the corresponding sleeve (44 or 45) engages in the valve plug (38) or in the valve plug (46). Since the outer ring (49) of the guide (40) is fixed when the holder body (2) and the rear part (4) are screwed together, precise guiding of both valve cones (38, 46) via the centering pin (43) is ensured.
  • the spring (47) serves to load the valve cone (46). Since this valve cone is displaced by the oxygen pressure, the spring (47) is designed softer than the spring (39). The latter spring (39) must quickly and safely penetrate the slag Press the valve plug (38) into the valve seat. In an emergency, this process is supported by the oxygen still flowing out. The necessary sealing is provided in the area of the outer ring (49) via the O-ring (48), so that even here, despite the high pressure of oxygen, no gases can escape.
  • Fig. 2 illustrates the moment when the lance (50) is inserted into the holder body (2) or the lance holder (1).
  • the buffer sleeve (20) has not yet been moved here and, accordingly, the valve disk (18) is still drawn in the closed position. If the lance (50) is now pushed further, the valve disk (18) is moved out of the sealing seat via the buffer sleeve (20). Then, when oxygen gas is supplied and the valve cone (46) is shifted accordingly, oxygen gas can flow through the holder body (2) and the lance (50).
  • the valve disc (18) follows due to the spring (19) loading the valve disc, which now automatically moves into the valve seat pushes in. This immediately ends the oxygen gas supply and the lance holder and hose are prevented from hitting, which can be very dangerous, especially for lance holders with a large cross section.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Dental Preparations (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

A lance holder intended for an oxygen lance produces substantially greater operational reliability by a valve disc being provided in the holder body between the slag-return preventer and clamping head, which valve disc can be displaced against the force of a spring via the inserted lance. The valve disc is pressed out of the sealing seat when the lance is pushed in, so that the refining gas can readily pass the lance holder. If the lance is lost through any accident, i.e. if it slips out of the lance holder, the valve disc thus also closes automatically so that oxygen gas cannot flow after, even inadvertently. Flapping of the oxygen hose with the lance holder located thereon is thus reliably prevented. At the same time, the slag-return preventer and the clamping head are designed in such a way that overall a very compact lance holder results. <IMAGE>

Description

Die Erfindung betrifft einen Lanzenhalter für eine Sauerstofflanze mit großem Durchmesser, mit einem die Lanze fixierenden Spannkopf und einer im Halterkörper angeordneten Schlackenrücklaufsicherung zwischen Lanze und Sauerstoffschlauch, die als Ventil ausgebildet ist, das beim Eindringen von Schlacke infolge dadurch zerstörter Sicherungen in den Ventilsitz gedrückt wird.The invention relates to a lance holder for an oxygen lance with a large diameter, with a clamping head which fixes the lance and a slag return safety device arranged in the holder body between the lance and oxygen hose, which is designed as a valve which is pressed into the valve seat when slag penetrates as a result of fuses destroyed thereby.

Lanzenhalter mit einem entsprechenden Spannkopf und einer Schlackenrücklaufsicherung dienen dazu, die zum Frischen benötigte Lanze sicher zu halten und zum anderen, beispielsweise bei einer Beendigung oder Unterbrechung des Blasvorganges zurücklaufende Schlacke nicht bis zum Sauerstoff gelangen zu lassen. Der DE-C 2 327 595 ist hierzu kurz vor dem Sauerstoffschlauch eine gasdurchlässige Scheibe aus Sintermetall zugeordnet, die den Schlackenrücklauf verhindern soll. Diese mechanische Absperrung des Schlackenrücklaufes erfüllt dort nicht die an sie gestellten Forderungen, wo größere Mengen an Sauerstoff durchgesetzt werden müssen, weil dann eine Sintermetallscheibe naturgemäß zu Schwierigkeiten führt. Die vor der gasdurchlässigen Scheibe angeordnete Ventilanordnung stellt eine zweite Schlackenrücklaufsicherung dar, wobei dieses Ventil schließt, wenn die darüber angeordnete Dichtung aufgrund eines Schlackenrücklaufes verbrannt ist. Bekannt sind aus der DE-B 2 447 723 auch aus gegeneinander verschiebbaren Ventilkegeln bestehende Schlackenrücklaufsicherungen, wobei über eine bei Berührung mit der Schlacke schmelzende Sicherung der entsprechende Ventilkegel in die Dichtfläche gedrückt wird, umso den Durchfluß der Schlacke zu verhindern und gleichzeitig auch das weitere Durchströmen des Sauerstoffs. Nachteilig ist, daß auch hier Probleme dann auftreten, wenn die Lanze sich durch Versehen oder durch Stoßen aus dem Lanzenhalter löst, wodurch es dann zu einem Schlagen des durch den ausströmenden Sauerstoff belasteten Lanzenhalters und Schlauchendes kommt. Eine Gefährdung der Bedienungsleute ist zu befürchten. Insbesondere bei Lanzen mit großem Durchmesser kann es allein schon aufgrund des großen Gewichtes der Lanze bei ungenügender Fixierung durch den Spannkopf zu einem solchen versehentlichen Herausfallen der Lanze kommen und damit zu einer Gefährdung in der oben beschriebenen Weise.Lance holders with a corresponding clamping head and a slag return safety device serve to hold the lance required for freshening securely and, on the other hand, not to let slag returning when the blowing process ends or is interrupted, until it reaches oxygen. DE-C 2 327 595 is assigned a gas-permeable sintered metal disc just before the oxygen hose, which is intended to prevent the slag return. This mechanical shut-off of the slag return does not meet the demands placed on it where larger amounts of oxygen have to be enforced, because a sintered metal disc then naturally leads to difficulties. The valve arrangement arranged in front of the gas-permeable disk represents a second slag return safety device, this valve closing when the seal arranged above is burnt due to a slag return. Known from DE-B 2 447 723 are slag return safeguards consisting of valve cones which can be displaced relative to one another, the corresponding valve cone being pressed into the sealing surface via a fuse which melts when it comes into contact with the slag, in order to prevent the flow of the slag and at the same time the further flow of oxygen. It is disadvantageous that problems also occur here if the lance is released from the lance holder by mistake or by being pushed, as a result of which the oxygen flowing out is struck loaded lance holder and hose end comes. There is a risk to the operators. Particularly in the case of lances with a large diameter, the lance may inadvertently fall out due to the great weight of the lance and inadequate fixation by the clamping head and thus endanger the manner described above.

Der Erfindung liegt die Aufgabe zugrunde, das gefährliche Schlagen des mit einer Schlackenrücklaufsicherung ausgerüsteten Lanzenhalters und Schlauches bei aus dem Lanzenhalter herausgerutschter Lanze sicher zu verhindern.The invention has for its object to safely prevent the dangerous hitting of the lance holder equipped with a slag return safety device and hose when the lance slipped out of the lance holder.

Die Aufgabe wird erfindungsgemäß dadurch löst, daß der Schlackenrücklaufsicherung eine Ventilscheibe vorgeordnet ist, die mit der eingeführten Lanze gegen die Kraft einer Feder verschiebbar ausgebildet ist und hierzu eine an sich bekannte in Richtung Lanze vorstehende und dem Lanzendurchmesser angepaßte Pufferhülse und gegen eine Verengung der Innenbohrung anliegende, schräg verlaufende Dichtflächen aufweist.The object is achieved in that the slag backflow preventer is preceded by a valve disk which, with the inserted lance, is designed to be displaceable against the force of a spring and, for this purpose, a buffer sleeve known per se projecting in the direction of the lance and adapted to the lance diameter and against a narrowing of the inner bore , has oblique sealing surfaces.

Damit ist überraschend ein Lanzenhalter geschaffen, bei dem die Sauerstoffzufuhr automatisch gestoppt wird, wenn die Lanze aus irgendwelchen Gründen versehentlich aus dem Lanzenhalter herausgefallen sein sollte. Unabhängig davon wirkt die Schlackenrücklaufsicherung ebenso sicher und schließt den Sauerstoffschlauch vom gefährlichen Schlackenfluß ab, so daß auch diesbezüglich eine Gefährdung nicht eintreten kann. Vorteilhaft ist darüber hinaus, daß die Sauerstoffzufuhr nur dann eingeschaltet ist, wenn die Lanze richtig in den Lanzenhalter eingeführt ist, d.h. wenn die Lanze gegen die Kraft der Feder die Ventilscheibe zurückgeschoben hat, um dann über den Spannkopf festgelegt zu werden. Diese doppelte Sicherheit kommt dem besonderen Bedürfnis der mit diesen Vorrichtungen tätigen Arbeiter entgegen, wobei vorteilhaft gerade bei den Lanzen mit großem Durchmesser und entsprechend hoher durchströmender Sauerstoffmenge der durch das Ausströmen des Sauerstoffs auftretende Rückstoß sicher ausgeglichen werden kann, insbesondere wie geschildert bei herausgefallener Lanze.This surprisingly creates a lance holder in which the oxygen supply is automatically stopped if the lance should accidentally fall out of the lance holder for any reason. Regardless of this, the slag return protection works just as safely and closes off the oxygen hose from the dangerous slag flow, so that there is no danger in this regard either. It is also advantageous that the oxygen supply is only switched on when the lance is correctly inserted into the lance holder, ie when the lance has pushed the valve disc back against the force of the spring, in order then to be fixed via the clamping head. This double security comes to the special need of the workers working with these devices, advantageously in the case of lances with a large diameter and correspondingly high oxygen flow rate, the recoil caused by the outflow of oxygen can be reliably compensated, in particular as described with the lance falling out.

Nach einer zweckmäßigen Ausbildung der Erfindung ist vorgesehen, daß zwischen der mit der Ventilscheibe verbundenen Pufferhülse und der Oberkante der Verengung eine Spiraldruckfeder angeordnet ist. Diese Ausbildung sichert, daß die Lanze beim Einführen durch den Spannkopf hindurch in Richtung Ventilscheibe genau zentriert eingeführt wird, so daß die Ventilscheibe auch gleichmäßig aus ihrer Dichtposition herausgeschoben wird. Die Spiraldruckfeder, die geschickt quasi Teil der eigentlichen Pufferhülse ist, sorgt dafür, daß die Ventilscheibe nicht weiter zurückgeschoben wird, als unbedingt notwendig. Vielmehr bemerkt der Bedienungsmann beim Einschieben der Lanze sehr schnell, daß er die Ventilscheibe verschoben und damit die Zufuhr für den Sauerstoff vorbereitend geöffnet hat. Die Pufferhülse ist vom Baumaß her etwas kürzer als die entsprechende Ausnehmung bzw. Innenbohrung in dem Halterkörper, so daß durch den entsprechenden Anstoß ein entsprechendes Signal an den Bedienungsmann kommt. Die Spiraldruckfeder verhindert gleichzeitig ein Verkanten der Ventilscheibe aufgrund ihrer sicheren Führung. Ein immer sicherer Sitz der Ventilscheibe ist durch die Verbindung von Pufferhülse und Ventilscheibe gegeben, da sie von zwei Federn belastet ist.According to an expedient embodiment of the invention it is provided that a spiral compression spring is arranged between the buffer sleeve connected to the valve disk and the upper edge of the constriction. This design ensures that the lance is inserted exactly centered in the direction of the valve disk when it is inserted through the clamping head, so that the valve disk is also pushed out evenly from its sealing position. The spiral compression spring, which is cleverly part of the actual buffer sleeve, ensures that the valve disc is not pushed back further than absolutely necessary. Rather, the operator notices very quickly when inserting the lance that he has shifted the valve disc and thus opened the supply for the oxygen in preparation. The size of the buffer sleeve is somewhat shorter than the corresponding recess or inner bore in the holder body, so that a corresponding signal is sent to the operator by the corresponding push. The spiral compression spring also prevents the valve disc from tilting due to its safe guidance. The connection of the buffer sleeve and the valve disc ensures that the valve disc always sits securely, since it is loaded by two springs.

Zur Erleichterung der Montage ist erfindungsgemäß vorgesehen, daß die Ventilscheibe und die Pufferhülse über Schrauben lösbar miteinander verbunden sind. Dadurch kann die Ventilscheibe als solche von der einen Seite her in den Halterkörper eingeschoben werden, während die eigentliche Pufferhülse von der anderen Seite her eingeführt wird. Durch die Verbindung über die Schrauben ist dann gleich eine sichere Anordnung und Lage gesichert, wobei die Ventilscheibe über die sich auf oder an einem Seegering abstützende Feder und gleichzeitig über die Spiraldruckfeder belastet ist. Die entsprechenden Schrauben können von außen her ohne Schwierigkeiten erreicht und gelöst bzw. festgedreht werden.To facilitate assembly, the invention provides that the valve disk and the buffer sleeve are releasably connected to one another by screws. As a result, the valve disk as such can be inserted into the holder body from one side while the actual one Buffer sleeve is inserted from the other side. A secure arrangement and position is then immediately secured by the connection via the screws, the valve disk being loaded via the spring which is supported on or on a circlip and at the same time via the spiral compression spring. The corresponding screws can be easily reached and loosened or tightened from the outside.

Ein vorteilhaft gleichmäßiger Fluß des Sauerstoffes innerhalb des Lanzenhalters ist gewährleistet, da die Pufferhülse in Höhe der Ventilscheibe radiale, bis annähernd zur Oberkante der Verengung reichende Wandausnehmungen großen Durchmessers aufweist. Das Gas kann somit bei entsprechend geöffnetem hinter der Ventilscheibe angeordneten Schlackenrücklaufventil an diesem und an der Ventilscheibe und der Pufferhülse vorbei in die Pufferhülse hinein und von dieser durch die Lanze hindurchströmen, um von dieser geführt zur Schmelze zu gelangen.An advantageously uniform flow of oxygen within the lance holder is ensured since the buffer sleeve has radial, large diameter wall recesses at the level of the valve disc that extend approximately to the upper edge of the constriction. The gas can thus flow with the slag return valve arranged behind the valve disk open and past it and past the valve disk and the buffer sleeve into the buffer sleeve and through it through the lance in order to reach the melt in a guided manner.

Die Erfindung zeichnet sich insbesondere dadurch aus, daß eine sehr sichere und alle Eventualitäten abdeckende Sicherung für Lanzenhalter geschaffen ist, wobei vorteilhaft durch die Mehrfachsicherung eine Optimierung erreicht ist. Bezüglich der Baumaße wird eine Kompaktlanze erreicht, die aufgrund der geschickten Anordnung und Zuordnung der einzelnen Ventile und Abschlüsse sehr kurz und mit geringem Durchmesser baut, die darüber hinaus aber vor allem auch sehr sicher arbeitet.The invention is characterized in particular by the fact that a very secure securing device for lance holders, covering all eventualities, is created, wherein optimization is advantageously achieved by the multiple securing device. With regard to the dimensions, a compact lance is achieved which, due to the skillful arrangement and assignment of the individual valves and terminations, has a very short and small diameter, but which above all also works very safely.

Weitere Einzelheiten und Vorteile des Erfindungsgegenstandes ergeben sich aus der nachfolgenden Beschreibung der zugehörigen Zeichnung, in der ein bevorzugtes Ausführungsbeispiel mit den dazu notwendigen Einzelheiten und Einzelteilen dargestellt ist. Es zeigen:

Fig. 1
einen Längsschnitt durch einen Lanzenhalter und
Fig. 2
einen Ausschnitt in vergrößerter Darstellung mit eingesetzter Lanze.
Further details and advantages of the subject matter of the invention emerge from the following description of the accompanying drawing, in which a preferred exemplary embodiment is shown with the details and individual parts required for this. Show it:
Fig. 1
a longitudinal section through a lance holder and
Fig. 2
a detail in an enlarged view with inserted lance.

Bei dem aus Fig. 1 ersichtlichen Lanzenhalter (1) handelt es sich um einen solchen, mit dem relativ große Durchmesser aufweisende Lanzen gehalten werden sollen, um auf diese Art und Weise mit dem Sauerstoffschlauch verbunden zu werden. Der Lanzenhalter (1) weist einen rohrförmigen, langgestreckten Halterkörper (2) auf, dessen oberes Ende der Spannkopf (3) und dessen unteres Ende das Hinterteil (4) bildet, das zum Verbinden mit dem Sauerstoffschlauch benötigt wird. Innerhalb des rohrförmigen Halterkörpers (2) ist die Schlackenrücklaufsicherung (5) untergebracht, die weiter hinten noch näher erläutert wird. Am Schraubanschluß (6) wird der Schlauch angeschlossen.The lance holder (1) shown in FIG. 1 is one with which lances having a relatively large diameter are to be held in order to be connected to the oxygen hose in this way. The lance holder (1) has a tubular, elongated holder body (2), the upper end of which forms the clamping head (3) and the lower end of which forms the rear part (4) which is required for connection to the oxygen hose. The slag return safety device (5) is accommodated within the tubular holder body (2) and will be explained in more detail later. The hose is connected to the screw connection (6).

Mit (7) ist die Spannzange bezeichnet, über die das entsprechend eingeschobene Rohr bzw. die Lanze an und im Lanzenhalter (1) festgelegt wird. Nach oben hin ist eine Abdichtung durch den O-Ring (8) bewirkt. Mit (9) ist ein Gewindestift bezeichnet, während (10) die Dichthülse ist, in der eine Dichtung (11) untergebracht ist, die beim Einziehen bzw. Einschieben der Lanze sich um diese legt und für die notwendige Abdichtung Sorge trägt, so daß Sauerstoff nicht seitlich an der Lanze vorbeiströmen kann. (12) ist die Druckhülse und (13) der Gewindering, wobei über letzteren sowie über das Spannstück (14) und den Hebel (15) das Verspannen des Lanzenhalters (1) bewirkt wird, um auf diese Art und Weise Lanzenhalter (1) und Lanzen miteinander zu verbinden. Etwa mittig des Lanzenhalter (1) ist eine Ventilscheibe (18) angeordnet, über die bei nicht eingeführter Lanze wie aus Fig. 1 ersichtlich, der Durchgang des Lanzenhalters (1), d.h. also dessen Innenbohrung (23) geschlossen ist. Die Ventilscheibe (18) wird über eine Feder (19) belastet, so daß sie wie erwähnt dann in dem Dichtsitz abdichtet, wenn eine Lanze nicht eingeführt ist. Die Ventilscheibe (18) ist mit einer Pufferhülse (20) verbunden und zwar lösbar über Schrauben (31), um auf diese Art und Weise das Verschieben der Ventilscheibe (18) durch die eingeführte Lanze zu bewirken. Wird nämlich in die Pufferhülse (20) bzw. in die am oberen Ende (26) ausgebildete Erweiterung (27) eine Lanze eingeschoben, so wird über die Pufferhülse (20) die Ventilscheibe (18) aus ihrem Kontakt mit der Dichtfläche (21) an der Verengung (22) hinausgeschoben. Dichtfläche (21) und Schulter (24) sind dann nicht mehr im Kontakt, so daß das von unten kommende Sauerstoffgas hier ohne Schwierigkeiten vorbeiströmen kann. Fig. 2 verdeutlicht hierzu, daß sowohl die Dichtfläche (21) wie auch die Schulter (24) über entsprechende Schrägen verfügen, um auf diese Art und Weise eine flächige Abdichtung zu erreichen.With (7) the collet is designated, via which the corresponding inserted tube or lance is fixed on and in the lance holder (1). The O-ring (8) seals upwards. With (9) a grub screw is designated, while (10) is the sealing sleeve, in which a seal (11) is housed, which when the lance is drawn in or pushed in, takes care of the necessary sealing, so that oxygen cannot flow past the side of the lance. (12) is the pressure sleeve and (13) the threaded ring, with the latter and the clamping piece (14) and the lever (15) causing the lance holder (1) to be clamped in this way to make the lance holder (1) and To connect lances with each other. A valve disc (18) is arranged approximately in the middle of the lance holder (1), via which, when the lance is not inserted, the passage of the lance holder (1), ie its inner bore (23), is closed, as shown in FIG. 1. The valve disc (18) is loaded by a spring (19) so that, as mentioned, it then seals in the sealing seat when a lance is not inserted. The valve disc (18) is connected to a buffer sleeve (20) and can be detached via screws (31) in order to move the valve disc (18) through the inserted lance. If a lance is inserted into the buffer sleeve (20) or into the extension (27) formed at the upper end (26), the valve disk (18) is brought out of contact with the sealing surface (21) via the buffer sleeve (20) pushed the constriction (22). Sealing surface (21) and shoulder (24) are then no longer in contact, so that the oxygen gas coming from below can flow past here without difficulty. Fig. 2 clarifies that both the sealing surface (21) and the shoulder (24) have appropriate bevels in order to achieve a flat seal in this way.

Die Pufferhülse (20) ist entsprechend in die Innenbohrung (23) eingepaßt, wobei ein Bereich geschaffen ist, in dem der Puffer (29) der Pufferhülse (20) auf die Oberkante (28) der Verengung (22) dann einwirkt, wenn durch die eingeführte Lanze ein entsprechendes Öffnen der Ventilscheibe (18) bezweckt wird. Der Puffer (29) ist hier als Spiralldruckfeder (30) ausgebildet, die dafür Sorge trägt, daß beim Einschieben der Pufferhülse (20) durch entsprechend größer werdenden Widerstand vom Bedienungsmann rechtzeitig erkannt wird, daß die Lanze ausreichend weit in den Lanzenhalter (1) eingeführt ist.The buffer sleeve (20) is correspondingly fitted into the inner bore (23), an area being created in which the buffer (29) of the buffer sleeve (20) acts on the upper edge (28) of the constriction (22) when through the inserted lance is intended to open the valve disc (18) accordingly. The buffer (29) is designed here as a spiral compression spring (30) which ensures that when the buffer sleeve (20) is inserted, the operator recognizes in good time that the lance is inserted sufficiently far into the lance holder (1) due to increasing resistance is.

Die Feder (19) der Ventilscheibe (18) stützt sich auf der Ventilscheibe (18) gegenüberliegenden Seite an einem Seegering (32) ab. Der Seegering ist sowohl in Fig. 1 wie in Fig. 2 sichtbar. Er ist in eine ringförmige Ausnehmung im Gehäuse eingesetzt.The spring (19) of the valve disc (18) is supported on the valve disc (18) opposite side on a circlip (32). The circlip is visible in both FIG. 1 and FIG. 2. It is in a ring shape Recess inserted in the housing.

Im Bereich der Ventilscheibe (18) sind in der Wandung der Pufferhülse (20) Wandausnehmungen (33, 34) eingebracht, um auf diese Art und Weise das Durchströmen des Sauerstoffes bzw. das Einströmen in das Innere der Lanze zu erleichtern. Die Wandausnehmungen (33, 34) weisen einen großen Querschnitt auf, um ausreichende Mengen an Sauerstoffgas hindurchführen zu können.In the area of the valve disk (18), wall recesses (33, 34) are made in the wall of the buffer sleeve (20) in order to facilitate the flow of oxygen or the flow into the interior of the lance. The wall recesses (33, 34) have a large cross section in order to be able to pass sufficient quantities of oxygen gas through them.

Siebgewindestift (35) ist in einem Kegelsieb über eine Lötstelle (36) festgelegt. Die Lötstelle (36) ist so ausgebildet und bemessen, daß bei Auftreten von Schlacke hier ein Lösen des Siebgewindestiftes (35) erfolgt, so daß der Ventilkegel (38), der Fig. 1 entnommen werden kann, in den entsprechenden Dichtsitz hineinschnellt. Über das Kegelsieb (37) ist dabei sichergestellt, daß die Schlacke zunächst einmal aufgehalten wird, zumindest bis die Lötstelle (36) zerstört und damit der Schließvorgang des Ventils eingeleitet ist.Screen grub screw (35) is fixed in a conical screen via a solder joint (36). The solder joint (36) is designed and dimensioned such that when slag occurs, the sieve grub screw (35) is loosened so that the valve cone (38), which can be seen in FIG. 1, snaps into the corresponding sealing seat. The conical sieve (37) ensures that the slag is initially stopped, at least until the soldering point (36) is destroyed and the valve is thus closed.

Der Ventilkegel (38) wird über die Feder (39) belastet, die sich am Innenteil der Schlackenrücklaufsicherung (5) abstützt. Diese Schlackenrücklaufsicherung (5) verfügt über eine Führung (40) für den Ventilkegel (38), auf den von der anderen Seite her das freie Ende (41) des Siebgewindestiftes (35) einwirkt und von innen der Zentrierstift (43), der in die entsprechende Hülse (44 bzw. 45) im Ventilkegel (38) bzw. im Ventilkegel (46) eingreift. Da der Außenring (49) der Führung (40) beim Zusammenschrauben von Halterkörper (2) und Hinterteil (4) festgelegt wird, ist so eine genaue Führung beider Ventilkegel (38, 46) über den Zentrierstift (43) gewährleistet. Während der Ventilkegel (38) durch die Feder (39) belastet ist, dient die Feder (47) zur Belastung des Ventilkegels (46). Da dieser Ventilkegel durch den Sauerstoffdruck verschoben wird, ist die Feder (47) weicher ausgelegt, als die Feder (39). Letztere Feder (39) muß ja beim Eindringen von Schlacke schnell und sicher dem Ventilkegel (38) in den Ventilsitz hineinpressen. Dieser Vorgang wird im übrigen im Notfall durch den noch ausströmenden Sauerstoff unterstützt. Über den O-Ring (48) ist im Bereich des Außenringes (49) für die notwendige Abdichtung gesorgt, so daß auch hier trotz mit hohem Druck anstehenden Sauerstoffes keine Gase entweichen können.The valve cone (38) is loaded by the spring (39), which is supported on the inner part of the slag return safety device (5). This slag return safety device (5) has a guide (40) for the valve cone (38), on which the free end (41) of the sieve grub screw (35) acts from the other side and from the inside the centering pin (43) which fits into the corresponding sleeve (44 or 45) engages in the valve plug (38) or in the valve plug (46). Since the outer ring (49) of the guide (40) is fixed when the holder body (2) and the rear part (4) are screwed together, precise guiding of both valve cones (38, 46) via the centering pin (43) is ensured. While the valve cone (38) is loaded by the spring (39), the spring (47) serves to load the valve cone (46). Since this valve cone is displaced by the oxygen pressure, the spring (47) is designed softer than the spring (39). The latter spring (39) must quickly and safely penetrate the slag Press the valve plug (38) into the valve seat. In an emergency, this process is supported by the oxygen still flowing out. The necessary sealing is provided in the area of the outer ring (49) via the O-ring (48), so that even here, despite the high pressure of oxygen, no gases can escape.

Fig. 2 verdeutlicht den Augenblick, in dem gerade die Lanze (50) in den Halterkörper (2) bzw. den Lanzenhalter (1) eingeschoben wird. Noch ist hier die Pufferhülse (20) nicht verschoben und dementsprechend auch die Ventilscheibe (18) noch in geschlossener Stellung gezeichnet. Wird nun die Lanze (50) weitergeschoben, so erfolgt über die Pufferhülse (20) ein Verschieben der Ventilscheibe (18) aus dem Dichtsitz heraus. Dann kann bei Zuleitung von Sauerstoffgas und entsprechendem Verschieben des Ventilkegels (46) Sauerstoffgas durch den Halterkörper (2) und die Lanze (50) hindurchströmen. Wird nun durch Versehen oder durch ungenügendes Betätigen der Spannzange (7) die Lanze (50) aus dem Lanzenhalter (1) herausgezogen, so folgt aufgrund der die Ventilscheibe belastenden Feder (19) die Ventilscheibe (18), die sich nun automatisch in den Ventilsitz hineindrückt. Damit endet sofort die Sauerstoffgaszufuhr und ein Schlagen von Lanzenhalter und Schlauch ist sicher verhindert, was insbesondere Lanzenhaltern mit großem Querschnitt sehr gefährlich werden kann.Fig. 2 illustrates the moment when the lance (50) is inserted into the holder body (2) or the lance holder (1). The buffer sleeve (20) has not yet been moved here and, accordingly, the valve disk (18) is still drawn in the closed position. If the lance (50) is now pushed further, the valve disk (18) is moved out of the sealing seat via the buffer sleeve (20). Then, when oxygen gas is supplied and the valve cone (46) is shifted accordingly, oxygen gas can flow through the holder body (2) and the lance (50). If the lance (50) is now pulled out of the lance holder (1) by mistake or by insufficient actuation of the collet (7), the valve disc (18) follows due to the spring (19) loading the valve disc, which now automatically moves into the valve seat pushes in. This immediately ends the oxygen gas supply and the lance holder and hose are prevented from hitting, which can be very dangerous, especially for lance holders with a large cross section.

Claims (5)

  1. Lance holder for a large diameter oxygen lance, incorporating a head for attaching the lance and a slag backflow safety device installed in a housing located between the lance and the oxygen hose, such safety device being in the form of a valve which, on destruction of safety devices through the penetration of slag, is pressed onto the valve seat, characterized by the fact that the slag backflow safety device (5) is preceded by a valve disc (18) which on introduction of the lance (50) is moved against the force of a spring (19) and hereto has an already known buffer sleeve (20) located on the lance side and adapted to the lance diameter, said valve disc having tapered sealing surfaces (21) abutting a narrowing (22) of the internal bore (23).
  2. Lance holder in accordance with claim 1, characterized by the fact that a helical compression spring (30) is located between the buffer sleeve (20) connected to the valve disc (18) and the top edge (28) of the narrow section (22).
  3. Lance holder in accordance with claim 1, characterized by the fact that the valve disc (18) and the buffer sleeve (20) are detachably connected together by screws (21).
  4. Lance holder in accordance woth claim 1, characterized by the fact that the spring (19) loading the valve disc (18) is clamped between the valve disc and a Seeger circlip (32).
  5. Lance holder in accordance with claim 1, characterized by the fact that at the level of the valve disc (18) the buffer sleeve (20) has large cross-section radial recesses (33), (34) which extend almost up to the top edge (28) of the narrow section (22).
EP88120123A 1988-12-02 1988-12-02 Lance holder for a compact lance Expired - Lifetime EP0372098B1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
DE88120123T DE3885616D1 (en) 1988-12-02 1988-12-02 Lance holder for compact lance.
EP88120123A EP0372098B1 (en) 1988-12-02 1988-12-02 Lance holder for a compact lance
AT88120123T ATE97167T1 (en) 1988-12-02 1988-12-02 LANCE HOLDER FOR COMPACT LANCE.
TR300/89A TR23539A (en) 1988-12-02 1989-04-03 COMBINED SUERGUE HOLDER
KR1019890006966A KR930011669B1 (en) 1988-12-02 1989-05-24 Lance holder for a compact lance
AU36498/89A AU611571B2 (en) 1988-12-02 1989-06-16 Lance holder for a compact lance
US07/373,876 US5131636A (en) 1988-12-02 1989-06-29 Lance holder for a compact lance
CA000605280A CA1336539C (en) 1988-12-02 1989-07-11 Lance holder for a compact lance
SG76494A SG76494G (en) 1988-12-02 1994-06-09 Lance holder for a compact lance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88120123A EP0372098B1 (en) 1988-12-02 1988-12-02 Lance holder for a compact lance

Publications (2)

Publication Number Publication Date
EP0372098A1 EP0372098A1 (en) 1990-06-13
EP0372098B1 true EP0372098B1 (en) 1993-11-10

Family

ID=8199623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88120123A Expired - Lifetime EP0372098B1 (en) 1988-12-02 1988-12-02 Lance holder for a compact lance

Country Status (8)

Country Link
US (1) US5131636A (en)
EP (1) EP0372098B1 (en)
KR (1) KR930011669B1 (en)
AT (1) ATE97167T1 (en)
AU (1) AU611571B2 (en)
CA (1) CA1336539C (en)
DE (1) DE3885616D1 (en)
TR (1) TR23539A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19547885C1 (en) * 1995-12-21 1997-09-11 Beda Oxygentech Armatur Pneumatic holder for lance manipulator
DE19903473B4 (en) * 1998-03-23 2006-10-26 Beda-Oxygentechnik Armaturen-Gmbh Lance holder with multifunctional clamping head

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3398154B2 (en) * 1995-01-26 2003-04-21 フォセコ、インターナショナル、リミテッド Tundish
IT1311080B1 (en) * 1998-03-23 2002-02-28 Beda Oxygentech Armatur SUPPORT FOR LANCES WITH MULTIFUNCTIONAL TIGHTENING HEAD.
DE102008012554B4 (en) * 2008-03-04 2011-12-22 Beda Oxygentechnik Armaturen Gmbh lance holder
DE102008019029A1 (en) * 2008-04-15 2009-10-22 Beda Oxygentechnik Armaturen Gmbh Lance holder with multi-tolerance clamping head
EP2482019B1 (en) * 2011-01-31 2014-10-01 Siemens VAI Metals Technologies GmbH Burning lance holder for holding a burning lance by means of a handling device
DE102012004515A1 (en) * 2012-03-06 2013-09-12 Beda Oxygentechnik Armaturen-GmbH Lance holder with fuse for odd, especially bent oxygen lances
CN103255262B (en) * 2013-05-27 2014-09-17 武汉北凯科技有限公司 Anti-falling brake device for oxygen lance
CN112322831B (en) * 2020-11-10 2021-06-22 中南大学 Slag heat recovery preheating type oxygen lance for electric arc furnace steelmaking and application method thereof

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Publication number Priority date Publication date Assignee Title
DE1943699U (en) * 1964-12-07 1966-08-04 Helmut Held CHUCKS, IN PARTICULAR AS BRUSH PIPE HOLDER.
DE7320339U (en) * 1973-05-30 1973-09-13 Schulz M Schweisstechnik Pipe holder, especially for an oxygen lance
DE2327595C2 (en) * 1973-05-30 1974-10-10 Fa. Manfred Schulz, 4032 Lintorf Tube holder, especially for the combustion tube of an oxygen lance
DE2447723C2 (en) * 1974-10-07 1975-11-13 Manfred 4032 Lintorf Schulz Tube body for an oxygen lance
FR2410678A1 (en) * 1977-12-03 1979-06-29 Schulz Manfred HANDLE FOR OXYGEN LANCE
SU730817A1 (en) * 1977-12-12 1980-04-30 За витель 730817 (II) Pfl№ ЯЯ И fi в А ЕЯЯ F Т Е Н N м №1 в 1е i i Tuyere fixing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19547885C1 (en) * 1995-12-21 1997-09-11 Beda Oxygentech Armatur Pneumatic holder for lance manipulator
DE19903473B4 (en) * 1998-03-23 2006-10-26 Beda-Oxygentechnik Armaturen-Gmbh Lance holder with multifunctional clamping head

Also Published As

Publication number Publication date
KR900017712A (en) 1990-12-19
EP0372098A1 (en) 1990-06-13
ATE97167T1 (en) 1993-11-15
KR930011669B1 (en) 1993-12-16
DE3885616D1 (en) 1993-12-16
CA1336539C (en) 1995-08-08
AU3649889A (en) 1990-06-07
TR23539A (en) 1990-03-22
AU611571B2 (en) 1991-06-13
US5131636A (en) 1992-07-21

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