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WO1996018470A1 - Dispositif de liaison entre une quenouille de recipient metallurgique et son appareil de levage - Google Patents

Dispositif de liaison entre une quenouille de recipient metallurgique et son appareil de levage Download PDF

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Publication number
WO1996018470A1
WO1996018470A1 PCT/DE1995/001761 DE9501761W WO9618470A1 WO 1996018470 A1 WO1996018470 A1 WO 1996018470A1 DE 9501761 W DE9501761 W DE 9501761W WO 9618470 A1 WO9618470 A1 WO 9618470A1
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WO
WIPO (PCT)
Prior art keywords
stopper rod
carrier
rod
arrangement according
stop
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.)
Ceased
Application number
PCT/DE1995/001761
Other languages
German (de)
English (en)
Inventor
Burkhard Labod
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1996018470A1 publication Critical patent/WO1996018470A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B22D41/18—Stopper-rods therefor

Definitions

  • the invention relates to an arrangement of the type corresponding to the preamble of claim 1.
  • refractory plug rods for regulating the flow of a molten metal from a pan or a tundish into a mold has been known for a long time.
  • the stopper rod is moved in the direction of its longitudinal axis by a lifting device adjacent to the outside of the tundish, whereby a pouring opening arranged at the bottom of the tundish, into which the stopper rod engages in the lowered state and closes completely, opens more or less becomes.
  • the flow of the molten metal can thus be regulated.
  • this regulation is in principle quite simple, the extreme conditions prevailing in steel processing place special demands on the materials and the technical design of the stopper rod. So this must withstand the action of a molten metal for hours.
  • a holding rod usually made of steel is used, which extends over a certain area into the stopper rod and is connected to it.
  • a gas channel is incorporated into the holding rod, which communicates on the one hand with the longitudinal bore of the stopper rod and on the other hand with a connecting device for the gas supply line. It is particularly important that the connection between the holding rod and the plug rod prevents ambient air from entering the inside of the plug rod and thus the molten steel, since this would lead to increased oxidation and thus to a deterioration in the steel quality.
  • connection between the ceramic plug rod and the metal holding rod is problematic because of the high thermal and mechanical loads acting on the connection. This problem is exacerbated in particular by the fact that - in order to reduce costs - a worn plug rod should be exchangeable for a new one by the personnel on site in a few simple steps and at the same time the components required for connecting the carrier to the plug rod should require the least possible production outlay.
  • the plug rod can be mounted on the holding rod designed as a carrier tube in a simple manner by inserting the carrier tube with a preassembled stop into a longitudinal recess in the plug rod and a locking member which fits into the inner volume of the carrier tube corre ⁇ sponding transverse opening rests, is displaced by suitable means so that it is the upper boundary surface of an installation space provided in the stopper rod.
  • a disadvantage of this arrangement is that due to the greater coefficient of thermal expansion of the metallic carrier material compared to the ceramic plug rod material, an increase in temperature, as occurs to a considerable extent when filling the liquid metal into the tundish, releases the tension between the stop and the locking members, so that the security against rotation of the plug rod to the carrier is no longer guaranteed at high temperatures.
  • the invention has for its object to develop a generic arrangement so that an increase in temperature does not lead to loosening the connection between the stopper rod and the carrier.
  • an insert is provided between a support surface provided on the stopper rod and a stop acting against it, which causes a holding element provided on the carrier to bear against a contact surface provided in the inner longitudinal recess of the stopper rod, which provides the various thermal Changes in length of the stopper rod and of the carrier in the area between the holding element and the stop are compensated.
  • the holding element therefore remains braced against the contact surface even at higher temperatures of the arrangement. The unwanted This reliably prevents the plug rod from rotating on the carrier at higher temperatures.
  • holding elements are to be understood as all possible devices provided in the area of the support projecting into the stopper rod, which are suitable for at least counteracting the support in the stopper rod by means of a positive interaction with a contact surface provided in the stopper rod or an insert fastened therein To lock tensile loads between them.
  • This also means, for example, connections through interlocking threads.
  • the stop consists of a nut which is screwed onto an external thread of the support which extends upward from the end face of the stopper rod and which is supported via a thrust washer on the insert compensating for the different changes in length and is thus designed as a counter device .
  • a thermal expansion coefficient which is suitable for use in the annular space and which projects slightly beyond the end face of the stopper rod and on which the counter device is supported is then particularly suitable as an insert.
  • the upper contact surface, against which the retaining element acts is provided in the inner volume of a press-in sleeve which is pressed into the stopper rod during isostatic pressing becomes.
  • both the press-in sleeve and the support tube forming the insert are made of the same metallic material as the carrier.
  • the area of the stopper rod surrounding the carrier along its length between the counter device and the holding element, which compensates for the clamping forces exerted on the holding element by tightening the counter device, thereby experiences a change in length corresponding to the carrier when the temperature changes, so that the holding elements always rest on the upper contact surface. Should a higher contact pressure of the holding elements against the upper contact surface be necessary at higher temperatures, it is also possible to manufacture the insert from a material which has a higher coefficient of thermal expansion than the carrier and thus overcompensates its change in length.
  • At least one blind bore extending approximately parallel to the central longitudinal recess is provided from the end face of the stopper rod, the bottom of which forms the support surface (claim 10).
  • the insert advantageously consists of a rod-shaped component which has an absolute thermal coefficient of longitudinal change which is at least the sum of the absolute longitudinal coefficient of the carrier in the area between the counter device and the holding element and that Plug material in the same area.
  • An arrangement according to claim 12 is particularly preferred, in which the length of the blind bore corresponds approximately to twice the distance between the contact surface and the end face of the stopper rod.
  • the insert then preferably consists of the carrier material (claim 13). This measure makes it particularly cost-effective to use.
  • FIG. 1 shows a longitudinal section through a first embodiment of the device according to the invention
  • Fig. 2 an auxiliary assembly rod
  • FIG 3 shows a longitudinal section through a second embodiment of the device according to the invention.
  • the arrangement designated 100 in the drawing as a whole consists of an elongated, metallic carrier 10, which projects with its lower region 1 into a longitudinal recess 8 of a refractory ceramic stopper rod 2.
  • the carrier 10 has a central longitudinal bore 3 that extends over its entire length on, whose diameter is about 30% of the outer diameter of the carrier 10.
  • the carrier 10 On its outer circumference 5, the carrier 10 carries an external thread 6 which extends from its upper end 4 to its lower region 1 and which serves on the one hand to receive a nut 7 and on the other hand to fasten the carrier 10 to a lifting device (not shown in the drawing).
  • the nut 7 forming a stop 70 delimits the lower region 1 of the carrier 10 which can be inserted into the longitudinal recess 8 of the stopper rod 2 and is supported by means of a thrust washer in the arrangement shown in FIG. 1 on the upper, front ends 52 of two diametrically opposite one another , rod-shaped inserts 54 inserted into blind bores 53 machined into the stopper rod.
  • the lengths of the rod-shaped inserts 54 are dimensioned such that they protrude slightly above the upper end face 11 of the stopper rod 2 when fully inserted into the blind bores 53.
  • In the direction of the longitudinal axis L of the arrangement between the support surfaces 56 and the upper end face 11 of the stopper rod 2 is approximately twice the distance between the end face and holding elements provided on the carrier, the function of which will be described below.
  • Locking elements 60 which can be displaced perpendicularly to the longitudinal axis L and which rest in two bores machined into the carrier 10 radially perpendicular to the longitudinal axis L of the arrangement serve as holding elements.
  • the locking members 60 consist of a cylindrical bolt 14 which rests in the bore 12 and forms a sliding fit with this.
  • the bolt 14 In the "unlocked" position, the bolt 14 remains entirely in the cross section of the carrier 10 and extends approximately from the outer mouth of the bore 12 to the longitudinal axis L of the arrangement, so that the lower region 1 of the carrier 10 can be inserted into the longitudinal recess 8 of the stopper rod .
  • the bolt 14 protrudes from the cross section by about half the diameter of the longitudinal bore 3 and engages behind an upper boundary surface 16, which is oriented perpendicular to the longitudinal axis L of the arrangement, of an installation space 17 which widens the longitudinal recess 8 and which is inside the plug rod 2 is provided.
  • an installation space 17 which widens the longitudinal recess 8 and which is inside the plug rod 2 is provided.
  • the upper boundary surface 16 is 16 provided with an undercut 18.
  • a further securing of the bolt 14 in its "locked” position is provided by a securing sleeve 19 inserted into the longitudinal bore 3, which is supported on a cross-sectional constriction 51 provided at the lower end 20 of the carrier 10.
  • the cross-sectional constriction 51 is brought about by means of a perforated disk attached to the lower end 20 of the carrier 1, the hole diameter 22 of which corresponds approximately to the inner diameter 23 of the securing sleeve.
  • the perforated disk 21 shown is secured to the carrier 10 by a spot weld 35, which can optionally be released by an external force, for example by a hammer blow.
  • the securing sleeve 19 extends from the perforated disk 21 upwards so far in the longitudinal bore 3 that it covers the bore 12 with its outer circumference, so that the bolt 14 cannot "shift" from its position.
  • an assembly aid rod 36 can be inserted from above into the longitudinal bore 3 of the carrier 10 and is shown in FIG. 2.
  • the assembly aid tab 36 consists of an elongated round rod 37, which comprises a handle 38 at its upper end. Its lower end forms a tapered cone 39 which, when inserted, interacts with the cones 15, 26 of the bolts 14, 24 located in the cross section of the carrier 10 and displaces them outwards. In this "locked” position, the bolts 14, 24 engage behind the upper boundary surface 16, so that the carrier 10 can no longer be pulled out of the plug rod 2.
  • the carrier 10 By subsequently tightening the nut 7 against the thrust washer 9, which is supported on the front ends 52 of the rod-shaped inserts 54, the carrier 10 can be countered, as a result of which a firm, rotatable fit of the stopper rod 2 on the carrier 10 is ensured is.
  • the rod-shaped inserts 54 expand to an extent that corresponds to the sum of the thermal linear expansion of the carrier between the counter device and the holding element and the thermal linear expansion of the plug rod material than in the area between the support surface 56 and the upper contact surface 16 ,
  • the thrust washer 9 is "tracked" by the thermal expansion of the rod-shaped inserts 54 of the displacement of the nut 7 caused by the thermal expansion of the carrier relative to the bolts 14, so that the thrust washer 9 is always under tension on the upper ends 52 the rod-shaped inserts 54 rests and thus the bolts 14, 24 are pulled against the upper contact surface 16.
  • a firm, non-rotatable seating of the stopper rod 2 on the carrier 10 is therefore ensured even at high temperatures.
  • the rotationally symmetrical installation space 17 is machined into a press-in sleeve 29 which is made of a metal workpiece. fabricated turned part.
  • the installation space 17 has a cylindrical region 30, which extends downward from the upper contact surface 16 and to which a flat-tapering region 31 adjoins, which merges into the longitudinal recess 8.
  • the bolts 14, 24 possibly after removing the securing sleeve 19 — after the nut 7 has been removed or moved upward from its position “locked” into the “unlocked” position in that the Carrier is pushed further into the longitudinal recess 8 of the plug rod 2 and the bolts 14, 24 are displaced back into the cross section of the carrier 10 through the side walls of the flat conical region 31 of the installation space 17. After this process, the carrier 2 can be pulled up out of the stopper rod.
  • the press-in sleeve In its area 32 above the upper boundary surface of the installation space 17, the press-in sleeve forms part of the longitudinal recess 8. In this area 32, an inner all-round groove 33 is machined into the press-in sleeve 29, which serves to receive a heat-resistant sealing ring 34.
  • the high sealing action between the press-in sleeve 29 and the carrier 10, which is required in special applications, can be achieved by the sealing ring 34.
  • the press-in sleeve 29 has a cylindrical outer shape. Their security against rotation in the stopper rod 2 is served by a flat key surface 40 milled into its outer periphery. Since the press-in sleeve 29 is pressed together with the stopper rod 2, its outer periphery is completely surrounded by the ceramic stopper rod material.
  • annular space 58 which enlarges the central longitudinal recess 8 of the plug rod 2 is machined between the upper end face 11 of the plug rod and the upper end face 57 of the press-in sleeve 29 '.
  • the bottom of the ring The space-forming region of the end face 57 of the press-in sleeve 29 'represents the support face 56' in this exemplary embodiment.
  • An insert designed as a support tube 59 is inserted into the annular space 58 from above and extends from the support surface 56 to slightly above the upper end surface 11 of the plug rod 2.
  • the nut 7 is countered via the pressure disc 9 against the upper end 62 of the support tube 59, as a result of which the plug rod 2 is firmly seated on the carrier 10 in the manner described.
  • a heat-resistant sealing ring 43 as shown in FIG. 3, can also be inserted into the upper circular groove 41.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

La présente invention concerne un dispositif de liaison entre une quenouille allongée (2), faite d'une matière réfractaire, destinée à un récipient métallurgique, et l'appareil de levage de cette quenouille. Un support (10) fait d'une matière métallique pénétré par l'une de ses extrémités dans un évidement longitudinal intérieur (8) de la quenouille (2) depuis sa face transversale supérieure (11), et au moins un élément d'arrêt, placé sur sa partie qui fait saillie dans l'évidement longitudinal (8) intérieur de la quenouille (2) et qui vient en contact, par derrière, avec une surface d'appui (16) ménagée dans la quenouille, empêche de retirer ce support de la quenouille (2). La partie du support (10) qui fait saillie dans la quenouille est limitée par une butée (70) qui agit contre une surface d'appui (56). La butée (70) verrouille l'élément d'arrêt contre la surface d'appui. Pour empêcher que la liaison ne se défasse, aux températures élevées, en raison d'une différence entre les coefficients de dilatation de la quenouille et du support, il y a, entre la surface d'appui (56) et la butée (70), une pièce additionnelle qui compense les différences de dilatation longitudinale entre la quenouille et le support, dans la partie comprise entre l'élément d'arrèt et la butée.
PCT/DE1995/001761 1994-12-15 1995-12-08 Dispositif de liaison entre une quenouille de recipient metallurgique et son appareil de levage Ceased WO1996018470A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4444617.9 1994-12-15
DE19944444617 DE4444617A1 (de) 1994-12-15 1994-12-15 Anordnung zur Verbindung einer Stopfenstange für ein metallurgisches Gefäß mit ihrer Hebevorrichtung

Publications (1)

Publication Number Publication Date
WO1996018470A1 true WO1996018470A1 (fr) 1996-06-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1995/001761 Ceased WO1996018470A1 (fr) 1994-12-15 1995-12-08 Dispositif de liaison entre une quenouille de recipient metallurgique et son appareil de levage

Country Status (2)

Country Link
DE (1) DE4444617A1 (fr)
WO (1) WO1996018470A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108607980A (zh) * 2018-08-21 2018-10-02 北京利尔高温材料股份有限公司 一种可高效吹氩气且具有去除絮流功能的塞棒

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19823988C2 (de) * 1998-05-29 2000-07-20 Didier Werke Ag Stopfen für den Verschluß von Metallschmelze aufnehmenden Behältnissen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT381261B (de) * 1982-08-11 1986-09-25 Brohltal Deumag Ag Stopfen zum verschliessen einer ausflussoeffnung fuer metallschmelzen
DE4040189C1 (en) * 1990-12-15 1992-01-02 Didier-Werke Ag, 6200 Wiesbaden, De Ceramic plug for outlet from metallurgical vessel - has supporting pipe with annular space to form sealing face, and nut is screwed onto it through which gas is delivered
DE4028793A1 (de) * 1990-09-11 1992-03-12 Didier Werke Ag Einrichtung zum halten eines stopfens bei einem metallurgischen gefaess sowie stopfen fuer eine solche einrichtung
DE4324768C1 (de) * 1993-07-23 1994-08-25 Labod Burkhard Anordnung zur Verbindung einer Stopfenstange für ein metallurgisches Gefäß mit ihrer Hebevorrichtung und für die Anordnung geeignete Stopfenstange sowie Verfahren zur Herstellung der Anordnung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT381261B (de) * 1982-08-11 1986-09-25 Brohltal Deumag Ag Stopfen zum verschliessen einer ausflussoeffnung fuer metallschmelzen
DE4028793A1 (de) * 1990-09-11 1992-03-12 Didier Werke Ag Einrichtung zum halten eines stopfens bei einem metallurgischen gefaess sowie stopfen fuer eine solche einrichtung
DE4040189C1 (en) * 1990-12-15 1992-01-02 Didier-Werke Ag, 6200 Wiesbaden, De Ceramic plug for outlet from metallurgical vessel - has supporting pipe with annular space to form sealing face, and nut is screwed onto it through which gas is delivered
DE4324768C1 (de) * 1993-07-23 1994-08-25 Labod Burkhard Anordnung zur Verbindung einer Stopfenstange für ein metallurgisches Gefäß mit ihrer Hebevorrichtung und für die Anordnung geeignete Stopfenstange sowie Verfahren zur Herstellung der Anordnung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108607980A (zh) * 2018-08-21 2018-10-02 北京利尔高温材料股份有限公司 一种可高效吹氩气且具有去除絮流功能的塞棒

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