DE102004027531B3 - Coupling for metallurgical vessel, especially a steel casting ladle useful for connecting a metallurgical ladle to a gas scavenging line includes a pan-shaped first and second coupling part with two gas inlet channels and gas exit channels - Google Patents

Abstract

A coupling for a metallurgical vessel, especially a steel casting ladle with two gas scavenging lines, a pan-shaped first (1) and second (2) coupling part with two gas inlet channels, gas exit channels, a locking element in the ladle scavenging device for controlling the blocking or unblocking of the gas flow, where part (2) includes a locking element in each gas exit and a further locking element outside part (2) and in the gas flow and connected to a permanently open gas inlet or outlet. An independent claim is included for a method coupling a metallurgical vessel to gas scavenging lines.

Description

The The invention relates to a coupling for coupling a metallurgical Vessel, in particular steel ladle, to at least two stationary arranged Gasspülleitungen a Pfannenspüleinrichtung according to the preamble of claim 1.

From the LU 87868 A is a coupling with a spring-operated valve designed as a closing element, which allows the simultaneous coupling of the ladle to two different stationary arranged gas flushing a Pfannenspüleinrichtung.

The essentially cylindrical coupling consists of a at the ladle arranged first (upper) coupling part and one to the Gasspülleitungen connected second (lower) coupling part.

The lower coupling part has in the head area to a maintenance and For maintenance purposes detachable Coupling head, in which a first central gas outlet for a Gas flow is provided. A second gas outlet opens into several circular Partial outlets arranged around the central outlet.

The upper coupling part has complementary to the gas outlets of the formed lower coupling part and connectable thereto gas inlets, wherein arranged around the contact points between the outlets and inlets a ring seal is in the coupled state an escape or mixing of the Gas should prevent.

The gas outlets at the coupling head are over sealed gas outlet channels with gas flushing pipes connected, which in turn are connected to a gas supply. The mutual sealing of the gas outlet channels is important to avoid "short circuits" in the gas flow, the flushing process in the ladle to disturb would. For this purpose, the valve is in the area of the second (side) gas outlet several elastic sealing elements for sealing to the central Outlet as well as outward Mistake.

The spring-actuated Valve is designed as a tandem valve with a double-cone seat for opening or Shut down the gas supply from the two Gasspülleitungen in the gas outlets.

The Valve is designed so that in the coupled state the Gas outlets over the Tandem valve open at the same time so that the gas, under high pressure from the gas scavenging over the gas discharge ports through the gas outlets of the coupling head in the lower coupling part in the gas inlets of the flow on the upper coupling part can.

One high gas pressure is required to control the ferrostatic pressure of the Liquid column in the steel ladle to overcome.

• – axiales Zusammenführen des ersten und des zweiten Kupplungsteils,
• – ventilbetätigtes Öffnen beider Gasauslässe des zweiten Kupplungsteils während des Ankupplungsvorganges,
• – Abdichten der einzelnen Übergänge zwischen den jeweiligen Gasaus- und Gaseinlässen nach Beendigung des Ankupplungsvorganges.

The coupling of the ladle to the gas scavenging lines takes place in the following steps:

• - axially merging the first and the second coupling part,
• Valve-operated opening of both gas outlets of the second coupling part during the coupling process,
• - sealing the individual transitions between the respective gas outlet and gas inlets after completion of the Ankupplungsvorganges.

These The aforementioned coupling has several disadvantages. The execution as spring-operated Tandem valve with two conical seats and the elastic sealing elements is expensive and expensive to manufacture and prevail in a steel mill harsh environmental conditions (temperature, dirt) high loads and thus exposed to high wear.

The elastic seals are fast due to the high temperatures hard and brittle and thereby lose their sealing function. In the case of high Pressurized purge gas does this to the above-described "short circuits" in the gas stream and thus to a reduction of the flushing intensity.

This means premature failure and repair of the clutch, a repair by the many components to be dismantled costly and expensive.

Farther It can lead to uncontrolled escape if the seals fail of purge gas come into the environment, whereby on the one hand the flushing power is reduced, and on the other hand expensive purge gas escapes unused.

task The invention is a coupling for coupling a metallurgical Vessel, in particular a steel ladle, specify the simpler and less expensive in construction and less is susceptible to wear.

These Task is based on the generic term in conjunction with the characterizing Characteristics of claim 1 solved. Advantageous developments and a method for coupling are Subject of dependent claims.

To The teaching of the invention is in the proposed coupling in second coupling part at most a closing element in a gas outlet and at least one other closing element outside the second coupling part arranged at least in the part of the gas supply, connected to the permanently open gas outlet or gas outlets is.

operational Experiments have shown that a substantial increase in service life of Clutch can be achieved if instead of one with many seals provided tandem valve only one closing element in the second (lower) Coupling part is used.

The closing element is advantageous as spring-actuated Valve formed, which only in the central outlet of the lower Coupling part is arranged, wherein the other outlet channel permanently remains open.

The Releasing or blocking the gas supply to the permanently open Outlet channel is over the arrangement of a further closing element outside of the lower coupling part in the gas supply to the lower coupling part regulated.

One The main advantage of this coupling is that now on a consuming produced spring-operated Tandem valve with double cone seat can be dispensed with and only still for the first central gas outlet has no further seals Valve needed becomes.

By the elimination of a valve in the region of the second gas outlet can Now also on the elastic sealing elements for mutual Sealing the gas outlet channels be waived.

The Coupling is thus much easier and cheaper in construction, being characterized by the reduction of wearing parts in the clutch above addition advantageously achieved a significant increase in the service life becomes.

The Advantages of the coupling according to the invention can both in a redesign, as well as in the state of the art The technology known coupling can be realized.

at a redesign of the clutch can be made using only a gas-tight from the outset gas-tight separate gas outlet channels provided become.

It but it is also possible the known with the prior art coupling with tandem valve economical to convert to just one valve. In this case, after removal of a valve, the seal between the central and the other gas outlet channel and outward now by a arranged in the former valve chamber gas-tight welded metallic Realized sealing plug, which is not subject to wear and therefore also no maintenance needed.

Of the already described approach to simplify the coupling according to the invention can still further be improved when according to the feature of claim 5 to the arrangement of a closing element in the lower coupling part Completely is waived.

The closing element is arranged separately from the clutch only in the gas supply to the lower coupling part, which simultaneously releases or closes the gas flow to the gas flushing lines. The Closing element can be arranged both in the gas supply of each gas purging, but it is also possible with only one closing element in a common gas supply all Gasspülleitungen simultaneously release or close.

The Operational practice has shown that in the known coupling while coupling, d. H. even before the sealing contact of the Clutch parts, by opening the valve, a strong gas flow to the upper trough-shaped coupling part is directed. The arranged in the upper coupling part in the coupling region Sealing elements are heavily stressed by this gas flow the consequence of an early Outage.

Therefore, according to the invention the closing element for the Gas supply in the gas supply arranged for coupling, so the time to open or Shut down the gas supply can be chosen freely in an advantageous manner. Advantageous the gas flow is only released when the coupling process is completed, d. H. the sealing contact of the coupling parts is done.

In a development of the invention can also be provided grazing, before the actual coupling process to open the gas supply for a short time. This is done advantageously in a sufficiently large distance from the upper coupling part, so that the seals in the coupling area not damaged by the gas flow can graze.

One convenient opening The gas supply before coupling, for example, can always make sense if there is a risk that penetrating into the open gas outlet ducts Dirt lead to blockages could. Due to the short-term gas emission, the outlet channels are released blown, so a trouble-free Gas flow can be ensured by the coupling in the steel ladle can.

These improved clutch is through a further significant reduction the number of parts with corresponding cost reduction in comparison for coupling with a closing element characterized in the lower coupling part, wherein by avoiding a potential damage by the gas flow before contacting the coupling parts, the At the same time, reliability is significantly increased.

Further Features, advantages and details of the invention will become apparent the following description of the illustrated in the drawings Embodiments. The same reference numerals in different figures denote the same Components. Show it:

1 Extensive representation of a coupling according to the invention with only one valve in the lower coupling part,

2 partial representation of a coupling according to the invention without a valve in the lower coupling part.

1 shows in sections a vertical section through an inventive substantially cylindrically shaped coupling for coupling a Stahlgießpfanne to at least two stationary arranged Gasspülleitungen a Pfannenspüleinrichtung, wherein the two coupling parts are shown in a non-coupled position. To see is a retrofitted according to the invention coupling, which has only one valve in the lower coupling part.

Shown are attached to the steel ladle upper coupling part 1 as well as the stationary gas flushing pipes 10 . 10 ' the pan rinsing device arranged lower coupling part 2 , The gas purging lines are connected to a common gas supply, not shown, of the pan rinsing device.

The lower coupling part 2 is arranged in such a stationary manner in the receiving device for the ladle, also not shown, that by a vertical lowering movement of the ladle into the receiving device, the coupling parts 1 . 2 moved towards each other and can be automatically coupled together in the correct position.

This is the upper coupling part 1 excepted trough-shaped in Kupplungsberich and the lower coupling part 2 Complementarily designed to be substantially conical, so that over the resulting Forced operation of the coupling parts 1 . 2 Automatically align with each other even if the alignment is not exact.

The upper coupling part 1 has a central gas inlet channel 12 and one around the gas inlet duct 12 arranged annular gas inlet channel 13 on, in the coupling area in several partial inlets 16 empties.

The lower coupling part 2 has a complementary to the trough-shaped coupling region of the upper coupling part 1 essentially conically shaped coupling head 44 on, with in the coupling area to the Gaseinlaßkanäle 12 . 13 connectable gas outlets 5 . 6 , which are arranged in the coupling area seals 7 . 7 ' sealingly connected to each other.

The coupling head 11 is for maintenance purposes with screws 17 and in the connection area provided seals 8th . 8th' with the lower coupling part 2 releasably connected.

The central gas outlet 5 is via the gas outlet duct 4 with the gas flushing line 10 and the partial outlets 6 over the gas outlet channel 4 ' with the gas flushing line 10 ' connected.

According to the invention, the coupling head 11 only one more in the central gas outlet 5 arranged with a pen 9 in the coupling process to be actuated valve 3 on, which in the unopened state via a conical seat in the coupling head 11 the central gas outlet 5 to the gas outlet channel 4 or to the gas purging line 10 seals. The higher gas outlet 6 is now permanently open without a valve.

The gas outlet channels 4 . 4 ' are via a sealing plug arranged in the former valve area 14 by means of a weld 15 gas-tightly separated, so that the gas streams are permanently separated from each other.

In a redesign, as described above, the lower coupling part 2 with the elimination of a valve from the outset with completely separate gas outlet channels 4 . 4 ' be designed, whereby the welding of a sealing plug 14 eliminated.

The coupling process of the ladle to the gas flushing pipes 10 . 11 happens as follows:
First, by lowering the ladle, the upper 1 and the lower coupling part 2 merged. The axially movable valve 3 is in the central gas outlet 5 arranged and protrudes in the uncoupled state on the contour of the coupling head 11 in addition, so that when the axial movement of the coupling parts 1 . 2 the valve 3 even before the sealing contact of the coupling parts 1 . 2 opens.

About the released opening of the conical seat can after the sealing contact the purge gas on the gas purging 10 through the gas outlet channel 4 in the central gas outlet 5 stream.

After the sealing contact is over another outside of the coupling part 2 in the gas supply of the gas flushing lines 4 . 4 ' arranged closing element open the common gas supply, so that the purge gas through the gas purging 10 . 10 ' through the gas outlet channel 4 . 4 ' to the central gas outlet 5 and to the partial outlets 6 in the coupling head 11 can flow.

When uncoupling becomes the spring 9 of the valve 3 again relieved, with the valve 3 the central gas outlet 5 in the coupling head 11 closes again, at the same time, the gas supply to the gas outlets on the closing element in the gas supply is closed again.

In 2 a coupling according to the invention is shown, which does not require valve in the lower coupling part and thus is very inexpensive to manufacture and also wear and thus low maintenance. The outer structure of the clutch is substantially identical to the illustration in FIG 1 so that a detailed description is omitted.

The closing element for the gas flow is now separated from the clutch only in the gas supply to the lower coupling part 2 arranged, which the gas flow to the Gasspülleitungen 10 . 10 ' simultaneously releases or closes. The closing element can both in the gas supply of each gas purging 10 . 10 ' be arranged, but it is also possible with only one closing element in a common gas supply all Gasspülleitungen 10 . 10 ' to release or close at the same time.

The procedure for coupling and uncoupling essentially corresponds to that of 1 described, however, the closing elements for controlling the gas flow are now operated independently of the actual coupling process, so that the time to open and close the gas supply can be chosen freely in an advantageous manner. LIST OF REFERENCE NUMBERS

Claims (6)

Coupling for coupling a metallurgical vessel, in particular a Stahlgießpfanne, at least two stationary arranged on a gas supply gas flushing a Pfannenspüleinrichtung, comprising a metallurgical vessel attached, formed in the coupling area trough-shaped first coupling part with at least two gas inlet channels and connected to the Gasspülleitungenes, in the coupling area complementary to the trough of the first coupling part formed second coupling part with at least two connectable to the gas inlet channels of the first coupling part against each other sealable gas outlet channels, wherein a gas outlet centrally in the coupling region in a gas outlet and another gas outlet in circular arranged around the central channel part outlets opens and at least in the pan rinsing a closing element is arranged, which regulates the release or blocking of the gas flow characterized gek indicates that in the second coupling part ( 2 ) at most one closing element in a gas outlet ( 5 . 6 ) and at least one further closing element outside the coupling part ( 2 ) is arranged at least in the part of the gas supply, with the perma nent open gas outlet or the gas outlets is connected. Coupling according to claim 1, characterized in that only the central gas outlet ( 5 ) of the second coupling part ( 2 ) is provided with a closing element. Coupling according to claim 1 and 2, characterized in that the closing element in the coupling part ( 2 ) as a valve ( 3 ) is trained. Coupling according to claim 2, characterized in that the valve ( 3 ) as one with a spring ( 9 ) loaded valve is formed. Coupling according to claim 1, characterized in that only in the gas supply of the gas flushing lines ( 10 . 10 ' ) outside the coupling part ( 2 ) A closing element is arranged. Method for coupling a metallurgical vessel to at least two stationary gas purging lines with a coupling according to claim 5, wherein the first ( 1 ) and second coupling part ( 2 ) are moved toward one another and when merging the transitions between the gas outlet channels are sealed and the Spülgaszufluss is released by operating the closing element in the coupled state, characterized in that prior to coupling the open gas outlets ( 5 . 6 ) or the gas outlet channels ( 4 . 4 ' ) are blown free by partial and short-term opening of the gas supply and after coupling the purge gas is fully opened.