Ladle plugging method and applicator device

Description

[0001] This invention relates to a method for preparing a ladle for a cycle of filling and casting of molten metal and in particular steel and allowing avoiding obstruction of the casting channel of the ladle during the process. This invention also relates to a device for implementing said method.

[0002] The problem related to the accidental stopping of the casting channel of the ladle used for feeding melted steel to the ingot mould and closable with a controlled valve generally of the valve type has been known in the steel mill field for a long time.

[0003] Indeed, when the ladle is filled, part of the molten metal poured into it can solidify and be deposited on the walls of the casting channel. This phenomenon, if not appropriately opposed, can lead to complete obstruction of the channel and prevent casting and thus require interruption of the process.

[0004] Accidental obstruction of the channel is quite unacceptable from the economic and technical viewpoints since it requires that the workers of the steel mill intervene manually (for example, with oxyhydrogen flame) to free the channel and immediately bring about flow of the molten metal.

[0005] This intervention, in addition to slowing performance of the casting, endangers the physical safety of the workers who find themselves dangerously near to the flow of molten steel at the time of restarting of the casting so that it is extremely important to reduce to a the possible minimum the frequency of the occurrence.

[0006] To solve the problem, it has been proposed to pour a mixture of refractory powders into the ladle before beginning filling it with molten steel. These powders would occupy the casting channel of the ladle closed by the valve to avoid the molten metal seeping into the channel before beginning casting and solidifying there because of the relatively low temperature of the channel (NZ 280 990 A).

[0007] The mixture, however, is poured by the worker into the casting channel on the bottom of the ladle from the upper inlet opening of the molten steel and does not always go to appropriately occupy the channel so that the obstruction phenomenon is not always opposed in a satisfactory manner and with a certain frequency the solid plug preventing flow of the molten steel can still form. The operation is also long and awkward and calls for intervention of specialized workers.

[0008] It has also been proposed to insert a cylindrical tube into the casting channel from the outside of the ladle through the open channel valve. Before being inserted in the ladle the tube can be filled with granular refractory material and in use obstruct formation of the metal plug in the casting channel during filling of the ladle.

[0009] But this tube adapts poorly to the typically flared form of the casting channel and cannot adhere to the walls of the channel. It is noted however that the cross section of the channel can vary from casting to casting due to its natural wear while making use of the prior art tubes inadequate still more disadvantageous.

[0010] The general purpose of this invention is to remedy the above-mentioned shortcomings by making available a method for preparing a ladle for a filling and casting cycle allowing limiting to a minimum the possibility of obstruction of the casting channel of the ladle during processing and avoiding creation of situations dangerous for the workers of the mill.

[0011] Another purpose is to make available a simple and economical device for implementation of said method.

[0012] In view of this purpose it was sought to provide in accordance with this invention a method of preparing for a filling cycle and subsequent casting of molten metal a ladle comprising a casting channel closed by a plugging valve and comprising the steps of:

• opening the valve,
• inserting from the outside a deformable shell provided with an opening through the open valve inside the casting channel with the opening turned towards the valve with said shell having a maximum volume nearly equal to or greater than that of the casting channel,
• injecting from the outside a refractory substance with fluid behavior through the opening in the shell until swelling it and causing adherence of the walls of the shell to the channel wall, and
• closing the valve.

[0013] Again in accordance with this invention it was sought to make available a device for application of a refractory substance with fluid behavior in the casting channel of a ladle closed by a plugging valve and comprising means of feeding the substance to a pistol provided with a distributor designed to be inserted into the passage of the valve to reach with its injection end the outlet of the channel with there being provided at said injection end means of connection for engagement with an inlet opening of a starting cartridge comprising a flexible shell designed to receive the substance coming from the distributor inside the channel.

[0014] In addition in accordance with this invention it was sought to make available a cartridge designed to be inserted in the casting channel of a ladle through the plugging valve of the channel before filling of the ladle with molten metal and comprising a deformable shell having maximum volume nearly equal to or greater than the volume of the channel with the shell being provided with an opening through which once inserted in the channel it is designed to be filled with a refractory substance with fluid behavior until its walls do not adhere to the channel wall.

[0015] To clarify the explanation of the innovative principles of this invention and its advantages compared with the prior art there is described below with the aid of the annexed drawings a possible embodiment thereof by way of non-limiting example applying said principles. In the drawings:

FIG 1 shows a view of a ladle just before application of the mixture designed to avoid deposit of metal on the walls of the casting channel of the ladle,

FIG 2 shows an enlarged view of the ladle casting channel, the mixture injection pistol and the starting cartridge to be filled with the mixture attached to the end of the pistol,

FIG 2b shows the pistol and the cartridge before their mutual engagement,

FIG 3 shows a view similar to that of FIG 2 with the cartridge inserted in the casting channel,

FIG 4 shows a view of the cartridge inside the casting channel filled with the refractory mixture,

FIG 5 shows a view with the pistol extracted from the valve of the ladle and the filled cartridge inside the ladle, and

FIG 6 shows a view of the ladle while it is being filled with molten steel coming out of the furnace.

[0016] With reference to the figures, FIG 1 shows a ladle 11 provided with side walls 12a and 12b, an upper opening 62 for receiving the molten steel from the furnace (not shown) and a bottom wall 61. The ladle 11, shown empty before the casting cycle, is supported with the side wall 12a on a support 60 so that the bottom wall 61 is vertical.

[0017] On the bottom wall 61 the casting channel 27 is made opposite a wall part denominated 'seat-holding block'. On the outer face of the bottom 61 of the ladle opposite the outlet of the casting channel 27 there is a plugging (or casting) valve 14 made like a valve in accordance with techniques known in the steel-mill field.

[0018] The ladle 11 also comprises a pin 40 shown diagrammatically in broken lines and designed to engage with appropriate hooking means used for its movement in the mill and its rotation.

[0019] FIG 1 also shows a worker 13 holding in his hand a pistol 17 at the outlet end of which is fastened a cartridge 16 in the form of a sack with flexible wall and designed to be filled with a mixture of refractory substances with uncompressible fluid behavior once inserted in the casting channel. The refractory substances, as set forth below, have the function of preventing deposit of metal on the walls of the casting channel 27 of the ladle, preventing the molten from occupying its space during filling of the ladle. The substances could comprise a refractory powder (for example, of graphite), in prior art use for filling the casting channel.

[0020] The pistol 17 is connected through a tube or hose 24 to the pneumatic device 18 which has the function of injecting through the pistol inside the cartridge 16 the starting mixture coming from a special single-dose container 19 using the pneumatic energy supplied by a source of compressed air at the inlet 25.

[0021] FIG 2 shows an enlargement of the pistol 17, the cartridge 16, the valve 14 of the ladle (shown diagrammatically) and the casting channel 27.

[0022] The pistol 27 which receives the starting mixture from the hose 24 comprises a portion 23 on which are provided mixture injection operating means, a grip 20 and a distributor 21 shaped with an elongated form so as to be insertable into the passage 63 in the valve 14.

[0023] At the time of injection the distributor 21 conveys the starting mixture into the shell 16a of the cartridge 16 which is fastened to the sleeve 29 of the cartridge by means of a clamp 30 opposite an inlet opening thereof for the powders.

[0024] The sleeve 29 is fastened to the front end of the distributor 21 by means of appropriate hooking means (shown diagrammatically in FIG 2b) before insertion of the cartridge in the ladle.

[0025] On the distributor 21 is installed a striker 22 designed to go and rest against the valve 14 when the cartridge has reached the right position in the casting channel.

[0026] The shell 16a of the cartridge 16 is made of a deformable material such as to allow the shell to swell when the mixture of refractory substances is injected into it. The shell material is heat-resistant to withstand the relatively high temperatures of the casting channel 27 before beginning filling of the ladle. This allows operating even without complete cooling of the ladle, with benefit in the thermal balance of the casting operations and saving of waiting time for cooling.

[0027] The shell could be made of a fiber-glass cloth resistant up to a temperature of even 600°C to 700°C. The higher the temperature to which the shell will resist, the shorter will be the time of waiting between the end of a casting and the next filling. By conventional methods, it was necessary to wait a long time before the ladle was sufficiently cold to allow the worker to apply the mixture in the casting channel from the inside of the ladle.

[0028] The shell could even be made with plastic materials having high melting temperature and possibly even air-permeable.

[0029] The valve 14 shown open in FIG 2 is fastened to the outer face of the bottom wall 61 of the ladle and comprises a fixed pierced plate 26 on the side towards the ladle and a movable pierced plate 25 handled by means of the cylinder 31. The valve 14 also comprises an elongated nozzle downstream from the movable plate and forming the passage 63 aligned with the casting channel 27 in the bottom wall 61.

[0030] FIG 2b shows the pistol 17 before the cartridge 16 is fastened to its end 80. As already mentioned, on the end 80 of the distributor 21 are coupling means (shown diagrammatically) suited for engaging on the sleeve and on the clamp of the cartridge 16 to hold the shell 16a in the correct position during injection of the starting mixture and avoid the injection stream's pushing the cartridge towards the inside of the ladle.

[0031] In case of feeding of powders with compressed-air transport it is noted that the sleeve 29 could advantageously form an escape path for the transport air, for example with a porous air-permeable portion but such as to withhold the refractory powder.

[0032] FIG 3 shows the pistol 17 with the distributor 21 inserted in the passage inside the valve 14 and the cartridge 16 still empty inside the casting channel 27. The pistol is pushed by the worker until the striker 22 goes to rest on the lower end of the valve 14 and the cartridge 16 is arranged entirely beyond the movable plate 25 of the valve. The length of the distributor 21 is indeed sized according to the longitudinal extension of the valve 14 to terminate with its end at the height of the fixed plate 26 of the valve. The cartridge 16 is sized according to the dimensions of the channel 27 to occupy it along its entire length. In particular, the shell of the cartridge has its maximum volume not less than the volume of the casting channel 27 to have a correct and complete filling of the channel with the starting mixture and avoid molten metal penetrating into the channel before the beginning of the casting and being deposited there by solidification.

[0033] In the configuration of FIG 3 the worker is ready to inject the mixture into the cartridge by operating the pistol.

[0034] FIG 4 shows the mixture injection step. The shell 16a receives the powder and swells to go and occupy all the volume of the casting channel and possibly also the bordering zones inside the ladle. The walls of the shell go to adhere to the walls of casting channel 27. The coupling means at the end of the distributor 21 appropriately hold back the cartridge 16 in the correct position in the channel in this step.

[0035] Advantageously but not necessarily the injection takes place with the ladle still rotated with the casting channel arranged horizontally.

[0036] After injection of the mixture fed in the correct quantity into the single-dose container 19 applied to the pneumatic device 18 (nearly equal to the maximum volume of the shell 16a) the pistol 17 is extracted from the valve 14 by tearing the sleeve 29 from the shell 16a of the cartridge which remains well jammed in the channel.

[0037] Advantageously the means of coupling to the end 80 of the manifold can comprise a hook which acts on the clamp 30 when the pistol is drawn from the valve, propitiating separation of the sleeve 29 from the shell 16a.

[0038] The pistol being extracted, the valve 14 is closed as shown in the figure.

[0039] The ladle is now raised and rotated vertically using the pin 40 and is positioned beneath a furnace and is ready to begin the filling cycle and the subsequent casting of the molten metal.

[0040] FIG 6 shows the step in which the molten steel 42 is poured from the furnace 41 to the inside of the ladle 11 with the valve 14 closed. In this step the mixture in the cartridge 16 remains well positioned in the channel 27 and prevents the metal from reaching that zone of the ladle for all the time necessary for its filling, without however spreading into other zones of the ladle. In this step, the mixture carries out its main function i.e. avoiding deposit of metal on the walls of the channel. The material making up the shell could be partly destroyed by the effect of the high temperature reached in this step.

[0041] After the ladle has been filled, it is taken to the casting station, which can comprise for example, an ingot mold in accordance with known techniques in the steel mill field. The valve 14 is then opened and initially all the mixture, under the pressure of the molten metal in the ladle, comes out of the channel, after which casting of the molten steel begins.

[0042] It is now clear that the preset purposes have been achieved. Indeed, a method of preparing a ladle for a filling and casting cycle is made available avoiding obstruction of the casting channel in an economical, simple, rapid and simple manner and especially a manner not dangerous for the steel mill workers. Indeed, the mixture of starting refractory substances, thanks to the special procedure proposed in accordance with this invention is positioned selectively in the critical zone of the ladle (the casting channel) and can carry out its function in a more satisfactory manner compared with what happened in the prior art when it was poured from above into the ladle and not always went to occupy the channel satisfactorily. Accidental obstruction of the lower channel has been observed with a frequency lower than that experienced in case of filling of the channel with traditional methods.

[0043] In addition, thanks to the innovative method in accordance with this invention, the mixture of refractory substances is distributed over all the width of the channel to cause adherence of the starting cartridge walls to those of the channel and adapting perfectly to the flared form typical of casting channels.

[0044] Again, it was possible to reduce the waiting time between the end of a casting and the subsequent filling of the ladle to enable application of the mixture with the ladle at relative high temperature.

[0045] In addition, a simple and convenient device to be used for implementing the above method is made available to the worker for preparing the ladle for the processing cycle easily and in a short time.

[0046] Naturally the above description of an embodiment applying the innovative principles of this invention is given by way of non-limiting example of said principles within the scope of the exclusive right claimed here.

[0047] In particular, the adduction of the powders in the cartridge could be secured with any known technique even as an alternative to air flow transportation as illustrated previously.

Claims

1. Method of preparing for a filling cycle and subsequent casting of molten metal a ladle comprising a casting channel (27) closed by a plugging valve (14) and comprising the steps of:

- opening the valve,

- inserting from the outside a deformable shell (16a) provided with an opening through the open valve (14) inside the casting channel (27) with the opening turned towards the valve and with said shell having a maximum volume nearly equal to or greater than that of the casting channel,

- injecting from the outside a refractory substance with fluid behavior through the opening in the shell (16a) to swell it and cause adherence of the walls of the shell to the channel wall (27), and

- closing the valve (14).

2. Method in accordance with claim 1 characterized in that said shell (16a) is made of heat-resistant material.

3. Method in accordance with claim 1 characterized in that said shell (16a) has a maximum volume slightly greater than the volume of the channel (27).

4. Method in accordance with claim 1 characterized in that said substances are powders.

5. Method in accordance with claim 1 characterized in that said substances are injected into the shell by means of a pneumatic device (18).

6. Method in accordance with claim 1 characterized in that the ladle (11) is rotated with the casting channel (27) arranged horizontally during filling of the shell (16a).

7. Method in accordance with claim 1 characterized in that before being inserted in the channel (27) the shell (16a) is fastened at its opening to the injection end (80) of a pistol (17) designed to inject the refractory substance with the shell being pushed with the pistol to be inserted inside the casting channel and being held in the channel at the time of injection by the pistol fastening effect.

8. Device for application of a refractory substance with fluid behavior in the casting channel (27) of a ladle (11) closed by a plugging valve (14) and comprising means of feeding (18) the substance to a pistol (17) provided with a distributor (21) designed to be inserted into the passage of the valve (14) to reach with its injection end (80) the outlet of the channel with there being provided at said injecting end (80) coupling means for engagement with an inlet opening of a starting cartridge (16) comprising a flexible shell (16a) designed to receive the substance coming from the distributor (21) inside the channel (27).

9. Device in accordance with claim 8 characterized in that the means (18) of feeding the refractory substance are pneumatic.

10. Device in accordance with claim 8 characterized in that on the pistol distributor (21) there is provided a flange (22) designed to go and rest against the plugging valve (14) when the injection end (80) of the distributor (21) s at the outlet height of the casting channel (27).

11. Cartridge designed to be inserted in the casting channel (27) of a ladle through the plugging valve (14) of the channel before filling of the ladle with molten metal and comprising a deformable shell having maximum volume nearly equal to or greater than the volume of the channel with the shell (16a) being provided with an opening through which once inserted in the channel it is designed to be filled with a refractory substance with fluid behavior until its walls do not adhere to the channel wall.

12. Cartridge in accordance with claim 11 characterized in that the cartridge is provided with coupling means designed to engage with the injection end a distributor of the refractory substance at the inlet opening of the shell.

13. Cartridge in accordance with claim 12 characterized in that the coupling means are made up of a sleeve to which the shell (16a) is constrained by means of a clamp at its opening.

14. Cartridge in accordance with claim 11 characterized in that the shell (16a) is made of heat-resistance material.

15. Cartridge in accordance with claim 11 characterized in that the shell is made with fiber-glass cloth.

Ansprüche

1. Verfahren zur Vorbereitung eines Füllablaufs und des nachfolgenden Gießens von Metallschmelze in eine Gießpfanne, umfassend einen durch ein Verschlussventil (14) geschlossenen Gießkanal (27), umfassend den Schritt:

- Öffnen des Ventils,

- Einfügen von außen einer verformbaren, mit einer Öffnung versehenen Hülle (16a) durch das offene Ventil (14) hindurch innerhalb des Gießkanals (27) mit zum Ventil gerichteter Öffnung, wobei die Hülle ein Höchstvolumen besitzt, das im wesentlichen gleich oder größer ist als jenes des Gießkanals,

- Eingießen von außen eines feuerfesten Stoffs mit fluidem Verhalten durch die Öffnung hindurch innerhalb der Hülle (16a) bis sie derart angeschwollen wird, dass die Hüllenwände an der Wand des Kanals (27) zum Anliegen kommt,

- Schließen des Ventils (14).

2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Hülle (16a) aus einem wärmebeständigen Material besteht.

3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Hülle (16a) ein Höchstvolumen besitzt, das etwas größer als das Volumen des Kanals (27) ist.

4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die genannten Stoffe Pulver sind.

5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die genannten Stoffe in die Hülle mittels einer pneumatischen Vorrichtung (18) eingespritzt werden.

6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Gießpfanne (11) mit dem horizontal angeordneten Gießkanal (27) während der Füllung der Hülle (16a) gedreht wird.

7. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Hülle (16a) vor dem Einbringen in den Kanal (27) an seiner Öffnung am Einspritzende (80) einer für das Einspritzen des feuerfesten Stoffes bestimmten Pistole (17) befestigt ist, wobei die Hülle mittels der Pistole innerhalb des Gießkanals eingepresst wird, und im Kanal bei der Einspritzung durch Befestigung an der Pistole selbst zurückgehalten wird.

8. Vorrichtung zur Anwendung eines feuerfesten Stoffes mit fluidem Verhalten in den durch ein Schließventil (14) geschlossenen Gießkanal (27) einer Gießpfanne (11), umfassend Mittel für die Zufuhr (18) des Stoffes zu einer Pistole (17), die mit einem Verteiler (21) versehen ist, der dazu bestimmt ist, innerhalb des Durchgangs des Ventils (14) eingebracht zu werden, um mit ihrem Einspritzende (80) den Ausgang des Kanals zu erreichen, wobei am Einspritzende (80) Einsteckmittel vorgesehen sind, um mit einer Eintrittsöffnung einer Ausgangspatrone (16) in Eingriff zu kommen, die eine biegsame Hülle (16a) umfasst, die dazu bestimmt ist, den vom Verteiler (21) kommenden Stoff innerhalb des Kanals (27) aufzunehmen.

9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass die Mittel zum Zuführen (18) des feuerfesten Stoffes pneumatisch sind.

10. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass am Verteiler (21) der Pistole ein Flansch (22) vorgesehen ist, der dazu bestimmt ist, gegen das Schließventil (14) in Anlage zu kommen, sobald das Einspritzende (80) des Verteilers (21) sich auf der Höhe des Ausgangs des Gießkanals (27) befindet.

11. Patrone zum Einbringen innerhalb des Gießkanals (27) einer Gießpfanne durch das Schließventil (14) des Kanals vor dem Füllen der Gießpfanne mit Metallschmelze, umfassend eine verformbare Hüllte mit einem Höchstvolumen im wesentlichen gleich oder größer als das Volumen des Kanals, wobei die Hülle (16a) mit einer Öffnung versehen ist, durch die, sobald sie im Kanal eingebracht ist, dazu bestimmt ist, mit einem feuerfesten Stoff mit fluidem Verhalten gefüllt zu werden, bis ihre Wände an der Wand des Kanals anliegen.

12. Patrone nach Anspruch 11, dadurch gekennzeichnet, dass die Patrone mit Einsteckmittel versehen ist, die dazu bestimmt sind, mit dem Einspritzende mit einem Verteiler des feuerfesten Stoffes im Bereich der Eintrittsöffnung der Hülle in Eingriff zu kommen.

13. Patrone nach Anspruch 12, dadurch gekennzeichnet, dass die Einsteckmittel durch eine Muffe gebildet werden, an der die Hülle (16a) mittels einer Manschette im Bereich ihrer Öffnung befestigt ist.

14. Patrone nach Anspruch 11, dadurch gekennzeichnet, dass die Hülle (16a) aus wärmebeständigen Material besteht.

15. Patrone nach Anspruch 11, dadurch gekennzeichnet, dass die Hülle in einem Glasfasergewebe ausgeführt ist.

Revendications

1. Procédé de préparation d'une poche de coulée pour un cycle de remplissage et subséquent moulage de métal fondu, comprenant un canal de coulée (27) fermé par une soupape de bouchage (14) et comprenant les étapes de:

- ouvrir la soupape,

- insérer de l'extérieur une coquille déformable (16a) munie d'une ouverture à travers la soupape ouverte (14) à l'intérieur du canal de coulée (27), l'ouverture étant tournée vers la soupape et ladite coquille ayant un volume maximum presque égal ou supérieur à celui du canal de coulée,

- injecter de l'extérieur une substance réfractaire ayant un comportement fluide à travers l'ouverture dans la coquille (16a) pour la gonfler et causer l'adhérence des parois de la coquille à la paroi du canal (27), et

- fermer la soupape (14).

2. Procédé selon la revendication 1, caractérisé en ce que ladite coquille (16a) est fabriquée en une matière calorifuge.

3. Procédé selon la revendication 1, caractérisé en ce que ladite coquille (16a) a un volume maximum légèrement supérieur au volume du canal (27).

4. Procédé selon la revendication 1, caractérisé en ce que lesdites substances sont des poudres.

5. Procédé selon la revendication 1, caractérisé en ce que lesdites substances sont injectées dans la coquille par un dispositif pneumatique (18).

6. Procédé selon la revendication 1, caractérisé en ce que la poche de coulée (11) est tournée avec le canal de coulée (27) disposé horizontalement pendant le remplissage de la coquille (16a).

7. Procédé selon la revendication 1, caractérisé en ce que la coquille (16a), avant d'être insérée dans le canal (27), est fixée en correspondance avec son ouverture, à l'extrémité d'injection (80) d'un pistolet (17) destiné à injecter la substance réfractaire, la coquille étant poussée avec le pistolet pour l'insertion à l'intérieur du canal de coulée et étant retenue dans le canal lors de l'injection par l'effet de fixation du pistolet.

8. Dispositif d'application d'une substance réfractaire ayant un comportement fluide dans le canal de coulée (27) d'une poche de coulée (11) fermé par une soupape de bouchage (14) et comprenant des moyens d'alimentation (18) de la substance à un pistolet (17) muni d'un distributeur (21) destiné à être introduit dans le passage de la soupape (14) pour atteindre par son extrémité d'injection (80) la sortie du canal, des moyens d'accouplement étant prévus à ladite extrémité d'injection (80) pour l'engagement avec une ouverture d'entrée d'une cartouche de départ (16) comprenant une coquille flexible (16a) destinée à recevoir la substance en provenance du distributeur (21) à l'intérieur du canal (27).

9. Dispositif selon la revendication 8, caractérisé en ce que les moyens (18) d'alimentation de la substance réfractaire sont des moyens pneumatiques.

10. Dispositif selon la revendication 8, caractérisé en ce qu'on prévoit sur le distributeur (21) du pistolet une collerette (22) destinée à prendre appui contre la soupape de bouchage (14) quand l'extrémité d'injection (80) du distributeur (21) est à la hauteur de la sortie du canal de coulée (27).

11. Cartouche destinée à être insérée dans le canal de coulée (27) d'une poche de coulée à travers la soupape de bouchage (14) du canal avant le remplissage de la poche de coulée par du métal fondu et comprenant une coquille déformable ayant un volume maximum presque égal ou supérieur au volume du canal, la coquille (16a) étant munie d'une ouverture à travers laquelle après l'insertion dans le canal elle est destinée à être remplie d'une substance réfractaire ayant un comportement fluide jusqu'à l'adhésion de ses parois à la paroi du canal.

12. Cartouche selon la revendication 11, caractérisée en ce que la cartouche est garnie de moyens d'accouplement destinés à engager, par l'extrémité d'injection, un distributeur de la substance réfractaire en correspondance avec l'ouverture d'entrée de la coquille.

13. Cartouche selon la revendication 12, caractérisée en ce que les moyens d'accouplement se composent d'un manchon auquel est bloquée la coquille (16a) par une bride de serrage, en correspondance avec son ouverture.

14. Cartouche selon la revendication 11, caractérisée en ce que la coquille (16a) est fabriquée en une matière calorifuge.

15. Cartouche selon la revendication 11, caractérisée en ce que la coquille est fabriquée en tissu de fibre de verre.

Drawing