EP0922117B1 - Vorrichtung zum ankuppeln einer blaslanze an einen verteiler - Google Patents

Vorrichtung zum ankuppeln einer blaslanze an einen verteiler Download PDF

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Publication number
EP0922117B1
EP0922117B1 EP97930463A EP97930463A EP0922117B1 EP 0922117 B1 EP0922117 B1 EP 0922117B1 EP 97930463 A EP97930463 A EP 97930463A EP 97930463 A EP97930463 A EP 97930463A EP 0922117 B1 EP0922117 B1 EP 0922117B1
Authority
EP
European Patent Office
Prior art keywords
coupling
lance
pressure
piston
collector
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
EP97930463A
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English (en)
French (fr)
Other versions
EP0922117A1 (de
Inventor
Hubert Stomp
Serge Devillet
Fred Parasch
Daniel Fries
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.)
Paul Wurth SA
Original Assignee
Paul Wurth SA
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Filing date
Publication date
Application filed by Paul Wurth SA filed Critical Paul Wurth SA
Publication of EP0922117A1 publication Critical patent/EP0922117A1/de
Application granted granted Critical
Publication of EP0922117B1 publication Critical patent/EP0922117B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 present invention relates to a device for coupling a lance metallurgical blowing to a manifold.
  • the blowing lances are used for example for the conversion of cast iron in steel by blowing oxygen on the metal bath in a converter.
  • the blowing lances are generally cooled with a coolant, for example water, which circulates in a cooling circuit.
  • a lance comprises in general two annular chambers which are arranged coaxially around the oxygen channel of the lance and connected in the region of the lance nose so forming an annular supply and return channel for the fluid cooling. It follows that during its operation, such a lance must be connected to at least three pipes carrying the coolants and blowing.
  • the blowing lances must be changed due to wear after a fixed duration of use.
  • many devices have been proposed to partially automate the connection of the lance to the pipes necessary for its operation, i.e. to allow connection concomitant of all the necessary conducts.
  • Such devices include a coupling head with a first coupling surface and a clamping device for sealingly pressing the first surface coupling on a second coupling surface of the lance.
  • the head coupling comprises several coaxial channels, the first end of which is connected to one of the pipes carrying the coolants and blowing and the second end of which opens into the first surface coupling.
  • the coaxial channels of the lance open in the second mating surface, so that after establishment tight contact between the two elements by means of the tightening a transfer of fluids is made possible at the head-lance junction.
  • Document DE-A-2512 487 therefore proposes a coupling device in which the lance is suspended from the coupling head and fixed to it using two clamping bolts and attached nuts.
  • the bolts are mounted on the level of the coupling head so as to tilt laterally and are engaged in two notches with a flange secured to the lance. Strength necessary for the tight connection between the two mating surfaces is then established by tightening the two nuts.
  • the object of the present invention is to provide a coupling device for a blowing lance, allowing to dynamically adapt the force of pressure between the manifold and the lance as a function of pressure variations in cooling and / or blowing fluids.
  • this objective is achieved by a coupling device from a blowing lance to a collector, in which the force necessary to a tight junction between the collector and the lance is exerted by the fluid of cooling and / or blowing fluid.
  • the strength of pressure between the lance and the collector is not fixedly exerted by a conventional clamping means but it is exerted dynamically by one of the fluids necessary for the operation of the lance. This makes the pressure force between the collector and the lance varies according to the pressure of the fluid in question. As a result, abrupt variations in fluid pressures can be dynamically compensated so that even very violent water hammer does not lead to a risk of rupture of the system seal.
  • said cooling fluid and / or blowing acts via a pressure surface on the junction between the collector and the lance. It is known that the pressure force between the collector and the lance is proportional to the pressure of the fluid and to the surface area of pressure. It is obvious that we are talking here about the effective area of the pressure surface. The value of the pressure force for a certain fluid pressure can therefore be predetermined by the dimensioning of said pressure surface.
  • the pressure surface is, for example, integral with a piston which transmits the force of pressure at said junction.
  • the lance presents a first mating surface
  • the manifold has a second mating surface and one of said two mating surfaces is integral with said piston and opposite the pressure surface.
  • the piston can also constitute part of the lance as the collector. It includes one of the two surfaces required for the connection and tightens it tightly against the other of said two mating surfaces.
  • the piston is embedded in a recess of the manifold so as to delimit by said pressure surface a pressure at the bottom of said recess.
  • the pressure chamber can be connected directly to the fluid supply line cooling and / or blowing. Integrating the piston into the manifold also reduces investment costs since a refining unit includes several lances for a single collector.
  • the piston is executed in such a way that said force of pressure exerted by said piston is greater than the reaction force acting on the junction plane between said manifold and said lance.
  • difference between the seal obtained by the pressure force and the seal necessary, which constitutes the safety margin increases progressively as the pressure of the cooling and / or blowing fluid increases.
  • a preferred embodiment of the invention consists of a coupling device from a blowing lance to a manifold which is connected to pipes carrying blowing and cooling fluids, the lance comprising first channels for said fluids which extend through said lance and which open at one end into a first surface coupling, the manifold comprising second channels for said fluids, each of said second channels being associated with one of said first channels, being in connection with one of said conduits and opening out to a end in a second mating surface, said second surface of coupling being associated with said first coupling surface and which can be pressed against it by means of a clamping means so forming a tight junction between said first and second channels associated.
  • Said manifold comprises a coupling head and said second mating surface is integral with a piston which is embedded in a axial recess of said coupling block so as to delimit by a surface pressure chamber a pressure chamber at the bottom of said recess, said surface pressure of the piston being opposite the second coupling surface.
  • a supply line is connected to said pressure chamber so that the fluid supplied by said supply line exerts pressure on said pressure surface and therefore the piston exerts a pressing force on said first coupling surface.
  • this device makes it possible to dynamically compensate for sudden variations in fluid pressures and adapt automatically at high speed, i.e. at high fluid pressures, while retaining a safety margin in the form of minimum sealing required established by the clamping means.
  • the device comprises means attachment to suspend the lance to said coupling head.
  • Said hooking means eg hooks which are mounted pivotally on said coupling head and which can engage journals extending radially from said lance.
  • said attachment means comprise locking rods which are pivotally mounted on said coupling head as well as a radial flange on said lance on the side of the first coupling surface, said radial flange having radial notches intended to receive the locking rods so that the heads of said locking rods take support on the side of said flange which is opposite the first surface coupling.
  • the attachment is faster and poses less risk to the staff. Fixing with locking rods is particularly advantageous because it makes it possible to minimize the piston stroke.
  • the lance must be moved certain distance towards the coupling head until the heads blocking rods can pass the lower edge of said flange in order to be spread laterally.
  • the piston rests on the lance, it must also be moved the same distance, which should be done if necessary against the action of the clamping means. It is therefore advisable to limit the distance of movement to limit the work to be done to move the piston by example against the action of the clamping means or its weight.
  • Said clamping means preferably comprises springs which are arranged between the coupling head and said piston, said springs being prestressed when attaching the lance to the coupling head.
  • one of said two mating surfaces advantageously comprises an edge axially projecting annular extending, said annular edge having a inner diameter which is substantially equal to the outer diameter of the other said coupling surfaces.
  • Figure 1 shows a vertical cross section of a coupling for blowing lances. It includes a coupling head 2 which is connected to cooling and blowing fluid lines (not shown) on which a blowing lance 4 is hung.
  • the lance 4 comprises a central channel 6 for a blowing gas, eg oxygen, which is coaxially surrounded by two chambers 8, 10 with annular sections. Both chambers 8 and 10 are connected in the region of the lance nose 4 (not shown) so as to form a supply channel 8 and a return channel 10 to annular sections for the coolant.
  • the spear could include additional channels for other blowing gases. These channels would then be located coaxially between the central channel and the cooling system channels.
  • channels 6, 8 and 10 open out in a first mating surface 12 which is associated with a second coupling surface 14 of the coupling head 2.
  • channels 6, 8 and 10 then form mouths coaxial annulars which are separated radially by the front faces annular tubular walls 16, 18 and 20 of the different channels.
  • the walls 16, 18 and 20 are reinforced in the region of the first mating surface 12 and their front faces are executed in the form of surfaces sealing.
  • the first coupling surface 12 In order to allow a transfer of the cooling and blowing fluids from the coupling head 2 towards the lance 4, the first coupling surface 12 must be pressed tightly against the second mating surface 14 and a connection between channels 6, 8 and 10 and the pipes carrying the respective cooling and blowing fluids must be established.
  • the coupling head 2 advantageously comprises a piston 22 which is mounted axially sliding in a recess 24 of the coupling head 2 and can establish tight contact with the first coupling surface 12 under the action of a clamping means 25.
  • This piston 22 then has the second coupling surface 14 on its end oriented towards lance 4 and includes channels 26, 28 and 30 for fluids cooling and blowing which are assigned to channels 6, 8 and 10 of the lance 4.
  • One end of each channel 26, 28 and 30 opens out in such a way way in the second mating surface 14 that the mouths of the channels 6, 8 and 10 in the first mating surface 12 and the mouths respective channels 26, 28 and 30 in the second coupling surface 14 are superimposed exactly during mating.
  • the mouths of channels 26, 28 and 30 in the second coupling surface 14 are separated, similarly to the mouths of channels 6, 8 and 10 in the first mating surface 12, by front faces annular tubular walls separating the different channels 26, 28 and 30.
  • These annular front faces are then also executed in the form of sealing surfaces and, during coupling, bear on the faces respective annular front faces in the first mating surface 12.
  • the clamping means 25 which presses the second coupling surface 14 of the piston 22 against the first mating surface 12 of the lance comprises preferably springs which are arranged in a groove on the surface front of the coupling head 2 and bear against a radial projection 27 piston. These springs 25 are then prestressed during the coupling of the lance 4 and thus exert a force on the piston 22 in the direction of the lance 4. It it is obvious that any other tightening means would be suitable for pressing the piston 22 against lance 4, eg hydraulic cylinders, actuated worms by any motor, etc. or a combination of these.
  • the piston 22 On its end opposite to the second coupling surface 14, the piston 22 has a pressure surface 32 through which it delimits a pressure 34 in the bottom of the recess 24.
  • this pressure chamber 34 which in the example shown is connected to the supply line in coolant through a connecting pipe 36, the lance 4 is supplied with cooling fluid.
  • channel 28 of coolant supply opens into the surface of pressure 32 so as to be in connection with the pressure chamber 34.
  • the channel 30 for return of the cooling fluid advantageously opens in an annular chamber 38, delimited by a circumferential groove 40 in the piston and the side wall of the recess 24.
  • This annular chamber 38 is then connected to a connection pipe to the return line of the cooling fluid 42.
  • the axial dimension of the groove circumferential 40 is greater than the axial dimension of the mouth of the drain hose 42 so that the mouth of drain hose 42 is not blocked by the lateral surface of the piston during the axial displacement of this one.
  • the channel 26 of the blowing fluid opens into the pressure surface 32 of the piston 22 and is extended tightly through the pressure chamber 34 via a tube 44, one end of which is embedded so sliding and sealed in said channel 26 and the other end of which extends through the bottom of the recess 24 to exit at the top of the coupling head 2, where it ends in a connecting pipe 46 to the fluid line blowing.
  • the junction between the tube 44 and the channel 26 is made waterproof using several annular seals 48 arranged around the end embedded in the tube 44.
  • the pressure chamber 34 and the chamber ring 38 are sealed using O-rings which are arranged eg in circumferential grooves of piston 22.
  • An alternative design for connection of channel 26 to the respective supply line consists in extending the channel 26 beyond the pressure surface 32 so that it passes through the pressure chamber 34 and extends through a bore in the bottom of the recess 24 to exit at the top of the coupling head 2.
  • the channel 26 is guided through the bore in the bottom of the recess of watertight and axially sliding. Outside the coupling head 2, the channel 26 can then be connected to the gas supply pipe for blowing through a flexible compensator, which allows a tight connection and able to adapt to the axial displacements of the channel 26.
  • the lance is brought by a bridge or an ad hoc manipulator which positions it with its surface coupling 12 below the coupling surface 14 of the head coupling 2 so that the axes of the lance 4 and the coupling head 2 are aligned.
  • the piston 22 and therefore the second coupling surface 14 is now in their lowest position relative to the head coupling 2.
  • the lance 4 is then lifted until the two mating surfaces 12 and 14 come into contact.
  • one of the two surfaces (in the fig.1 the first mating surface 12) includes an annular edge 48 which extends axially and has an inner diameter which is substantially equal to the outside diameter of the other of said coupling surfaces 14.
  • the lance 4 is raised further and the piston 22 is moved against the action of the springs 25.
  • the weight of the collector and its equipment device acts as a counterforce, so the springs 25 can be prestressed with a force substantially equivalent to this weight.
  • the lance 4 is then advantageously hooked by two locking rods 50 which are mounted on either side of the coupling head 2 and are received by two notches 52 of a radial flange 54 of the lance 4, so that the heads 56 of the locking rods 50 bear on the lower surface of the flange 54.
  • the locking rods 50 are mounted on the coupling head 2 pivotally so that their heads 56 can be moved laterally (as indicated on the fig.).
  • the piston may as well be subjected to pressure blowing gas only at coolant pressure.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Threshing Machine Elements (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Small-Scale Networks (AREA)
  • Nozzles (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Details (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Claims (12)

  1. Vorrichtung zum Ankuppeln einer Blaslanze an eine Sammelleitung, dadurch gekennzeichnet, daß die für eine dichte Verbindung zwischen der Sammel-leitung (2) und der Lanze (4) notwendige Kraft durch ein Kühlfluid und/oder ein Blasfluid ausgeübt wird.
  2. Vorrichtung zum Ankuppeln nach Anspruch 1, dadurch gekennzeichnet, daß das Kühlfluid und/oder das Blasfluid über eine Druckfläche (32) auf die Verbindung zwischen der Sammelleitung (2) und der Lanze (4) einwirkt.
  3. Vorrichtung zum Ankuppeln nach Anspruch 2, dadurch gekennzeichnet, daß die Druckfläche (32) mit einem Kolben (22) einstückig ist, der die Druckkraft auf die Verbindung überträgt.
  4. Vorrichtung zum Ankuppeln nach Anspruch 3, dadurch gekennzeichnet, daß die Lanze (4) eine erste Kupplungsfläche (12) hat, daß die Sammelleitung (2) eine zweite Kupplungsfläche (14) hat und daß die eine der beiden Kupplungsflächen (12 oder 14) mit dem Kolben (22) einstückig ist.
  5. Vorrichtung zum Ankuppeln nach Anspruch 3 oder 4 , dadurch gekennzeichnet, daß der Kolben (22) in einer Vertiefung (24) der Sammelleitung derart ein-gepaßt ist, daß durch die Druckfläche (32) eine Druckkammer (34) am Boden der Vertiefung (24) begrenzt wird.
  6. Vorrichtung zum Ankuppeln nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß der Kolben (22) derart ausgeführt ist, daß die durch den Kolben (22) ausgeübte Druckkraft größer als die auf die Verbindungsebene zwischen der Sammelleitung (2) und der Lanze (4) einwirkende Reaktionskraft ist.
  7. Vorrichtung zum Ankuppeln einer Blaslanze an eine Sammelleitung, die an Leitungen angeschlossen ist, die ein Blas- und ein Kühlfluid befördern, wobei die Lanze (4) Kanäle (6, 8, 10) für die Fluide aufweist, die sich durch die Lanze (4) erstrecken und die an einem Ende in einer ersten Kupplungsfläche (12) münden, wobei die Sammelleitung zweite Kanäle (26, 28, 30) für die Fluide aufweist, wobei jeder der zweiten Kanäle (26, 28, 30) einem der ersten Kanäle (6, 8, 10) zugeordnet ist, mit einer der Leitungen verbunden ist und an einem Ende in einer zweiten Kupplungsfläche (14) mündet, wobei die zweite Kupplungsfläche (14) der ersten Kupplungsfläche (12) zugeordnet ist und gegen diese mit Hilfe eines Spannmittels (25) derart gedrückt werden kann, daß eine dichte Verbindung zwischen den ersten Kanälen (6, 8, 10) und den zugeordneten zweiten Kanälen (26, 28, 30) gebildet wird, dadurch gekennzeichnet, daß die Sammelleitung einen Kupplungskopf (2) aufweist, daß die zweite Kupplungsfläche (14) mit einem Kolben (22) einstückig ist, der in einer axialen Vertiefung (24) des Kupplungskopfes (2) derart eingepaßt ist, daß durch eine Druckfläche (32) eine Druckkammer (34) am Boden der Vertiefung (24) gebildet wird, wobei die Druckfläche (24) des Kolbens (22) der zweiten Kupplungsfläche (14) entgegengesetzt ist, und daß eine Zuführungsleitung mit der Druckkammer (34) derart in Verbindung steht, daß das durch die Zuführungsleitung zugeführte Fluid auf die Druckfläche (32) einen Druck ausübt und daß der Kolben (22) auf die erste Kupplungsfläche (12) eine Druckkraft ausübt.
  8. Vorrichtung nach Anspruch 7, gekennzeichnet durch Einhängemittel zum Aufhängen der Lanze (4) an dem Kupplungskopf (2).
  9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die Einhängemittel Haken aufweisen, die an dem Kupplungskopf schwenkbar montiert sind und mit Zapfen einklinken können, die sich von der Lanze (4) aus radial erstrecken.
  10. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die Einhängemittel Blockierstangen (50), die an dem Kupplungskopf (2) schwenkbar montiert sind, sowie einen radialen Flansch (54) an der Lanze (4) auf der Seite der ersten Kupplungsfläche (12) aufweisen, wobei der radiale Flansch (54) radiale Aussparungen (52) hat, die zur Aufnahme der Blockierstangen (50) bestimmt sind, so daß die Köpfe (56) der Blockierstangen (50) auf der Seite des Flansches (54) aufliegen, die sich gegenüber von der ersten Kupplungsfläche (12) befindet.
  11. Vorrichtung nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, daß das Spannmittel (25) Federn aufweist, die zwischen dem Kupplungskopf (2) und dem Kolben (22) angeordnet sind, wobei die Federn während des Einhängens der Lanze (4) an den Kupplungskopf (12) vorgespannt werden.
  12. Vorrichtung nach einem der Ansprüche 7 bis 11, dadurch gekennzeichnet, daß eine der beiden Kupplungsflächen (12 oder 14) einen sich axial erstreckenden hervorstehenden ringförmigen Rand (48) aufweist, der einen Innendurchmesser hat, der im wesentlichen gleich dem Außendurchmesser der anderen der Kupplungsflächen (14 oder 12) ist.
EP97930463A 1996-08-28 1997-07-01 Vorrichtung zum ankuppeln einer blaslanze an einen verteiler Expired - Lifetime EP0922117B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
LU88808A LU88808A1 (fr) 1996-08-28 1996-08-28 Dispositif d'accouplement d'une lance de soufflage à un collecteur
LU88808 1996-08-28
PCT/EP1997/003423 WO1998008983A1 (fr) 1996-08-28 1997-07-01 Dispositif d'accouplement d'une lance de soufflage a un collecteur

Publications (2)

Publication Number Publication Date
EP0922117A1 EP0922117A1 (de) 1999-06-16
EP0922117B1 true EP0922117B1 (de) 2000-05-10

Family

ID=19731622

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97930463A Expired - Lifetime EP0922117B1 (de) 1996-08-28 1997-07-01 Vorrichtung zum ankuppeln einer blaslanze an einen verteiler

Country Status (15)

Country Link
US (1) US6086818A (de)
EP (1) EP0922117B1 (de)
JP (1) JP2000516998A (de)
CN (1) CN1076399C (de)
AT (1) ATE192781T1 (de)
AU (1) AU714387B2 (de)
BR (1) BR9711249A (de)
CZ (1) CZ65699A3 (de)
DE (1) DE69701992T2 (de)
ES (1) ES2146105T3 (de)
LU (1) LU88808A1 (de)
PL (1) PL184089B1 (de)
PT (1) PT922117E (de)
RU (1) RU2199592C2 (de)
WO (1) WO1998008983A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9825428D0 (en) * 1998-11-19 1999-01-13 Kvaerner Metals Davy Ltd A quick change blow lance
US20050067743A1 (en) * 2003-09-29 2005-03-31 Eric Hatfield Internal bubble cooling unit and method for extruded thin wall thermoplastic sheet

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU69797A1 (de) * 1974-04-05 1974-11-21
US4083540A (en) * 1977-05-09 1978-04-11 Pullman Berry Company Gas and oxygen steel making lance
LU87387A1 (de) * 1988-11-16 1990-06-12 Wurth Paul Sa Automatische lanzenwechselvorrichtung
LU87425A1 (de) * 1989-01-16 1989-12-11 Wurth Paul Sa Automatische lanzenwechselvorrichtung
LU87761A1 (fr) * 1990-07-04 1992-03-11 Wurth Paul Sa Dispositif d'accouplement automatique d'une lance d'insufflation a une tete de raccord
LU88057A1 (de) * 1992-01-24 1993-08-17 Paul Wurth S.A. Blaslanzenaufhaengung mit kombinierter medienversorgung

Also Published As

Publication number Publication date
CN1228816A (zh) 1999-09-15
WO1998008983A1 (fr) 1998-03-05
PL331943A1 (en) 1999-08-16
BR9711249A (pt) 1999-08-17
CZ65699A3 (cs) 1999-10-13
PL184089B1 (pl) 2002-08-30
DE69701992T2 (de) 2000-10-05
US6086818A (en) 2000-07-11
DE69701992D1 (de) 2000-06-15
EP0922117A1 (de) 1999-06-16
AU3440897A (en) 1998-03-19
CN1076399C (zh) 2001-12-19
JP2000516998A (ja) 2000-12-19
ATE192781T1 (de) 2000-05-15
ES2146105T3 (es) 2000-07-16
LU88808A1 (fr) 1998-03-02
PT922117E (pt) 2000-10-31
RU2199592C2 (ru) 2003-02-27
AU714387B2 (en) 1999-12-23

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