DE7534464U - LOCKING DEVICE FOR THE TAPPING HOLE OF A METALLURGICAL VESSEL - Google Patents

Description

DIPL.-INQ. H. STEHMANlIfM. "'.! Λ /' i ... ^: H Nuremberg 2

ΕββΕΝννΚΙΝΒΤΚΑβΒΕ 4- «/

DIPL.-PHYS. DR. K. SCHWEIN2ER _{IEL: KANZLaonvm} "v private: 77" o " eat

DIPL-INQ.DR.M.RAU ίιίΐχ ^R ^ ai » ^{ADDRESS STANDARD PATENT}

PATENT ADVERTISER «BANK ACCOUNTS: DEUTSCHE BANK AG. NOENBERG BLZ 7 * 070012

ACCOUNT NUMBER. 3411 (M

CHECK ACCOUNT: NOtNBITG »7M1

Nuremberg, 29th Io. 1975 1720/55

Center de Reoherohes Metallurgiques - Center for Research in de Metallurgie, Association sans but lucratif - Vereniging zonder winstoogmerk - Brussels / Belgium

"Versohlußvorriehtung for the tap hole of a metallurgical

Vessel "

The invention relates to a closure device for the tapping hole of a metallurgical vessel, in particular for the pouring opening of a Sohüttpfanne for continuous casting sinss liquid metal, z. B. steel.

It is known that chill casting is carried out using a pouring pan, which in turn removes the liquid metal beforehand • In a vessel such as a melting cup receives. The bottom of the pouring ladle, with which the liquid steel is distributed to the molds, usually faces several, generally vertically extending pouring nozzles, which must be closed in order to close the pouring pan fill, and then released to begin casting.

Except for stoppers that come with continuous pouring large cast bodies are used, various arrangements and methods have been used to make these casting nozzles to close; but all of them have the fact that they are essentially disadvantageous when the pouring pan is opened Properties show so that the problem of an optimal

For the order relationship the GsbOhrerordnung der Dautidion Patentanwallikammar applies. - Place of jurisdiction (Qr performance and payment: Nuremberg. Long-distance conversations have no legally binding effect

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Closure for the tap hole of such a pouring pan has not yet been resolved.

Closures that have been used so far are essentially created in the following way: first, the outer opening of each pouring nozzle is sealed by means of an asbestos cord and then the outlet channel of the pouring nozzle as well his inlet funnel clogged by means of a finely powdered material, for which, for example, silicon oxide or Chromium or the like is used. To open the so clogged Absticnloohes the Asbestos sonur is grasped at its freely protruding end and pulled out, and the filling of the pouring pan is discharged through this opening due to the influence of the power of the vehicle.

The main disadvantages of such a way of closing the tap hole result on the one hand from the fact that the heat transfer to the casting nozzle is easy and on the other hand from the fact that the pulverized material slowly emerges when the closure is opened. These circumstances leave nw? a relatively slow entry of the Stahxes in the pouring nozzle to having a significantly below the temperature i ") door of the liquid metal lying temperature, is pre-heated because such bulk pan nioht. Due to the action of these cooler zone, the metal may solidify and clog the passage The casting nozzle can then only be cleared by means of an oxygen lance (an oxygen burner), which, however, often causes damage to the casting nozzle so that the casting device becomes unusable, with the consequence of costly production losses due to the unusability of this series of castings.

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These conventionally used closure remarks incidentally, cannot be used with such bottom pans that are tilted d. H. Their scope is apart from those operational disadvantages very limited.

The object of the invention is therefore to provide a locking device for the tap hole of a metallurgical vessel, which is not only suitable for pouring openings with vertical opening. canal is useful, but especially in the closed State a good heating of the pouring nozzles from the liquid metal in the pan is guaranteed and borrowed can be opened, with the result that the escape of the liquid metal from the Sohüttpfanne on the casting molds is to be distributed, sets in quickly.

In a Versohlußvorriohtung of the type mentioned, this object is essentially achieved according to the invention by a plug with an elongated body which extends through the pouring opening and has two shoulders of larger diameter at its ends, one of which is a head on the inner wall of the container , at the inlet J of the pouring opening, the other being designed adjacent to the outer wall of the container, at the outlet of the pouring opening *, at least one of the shoulders having an internal thread for receiving the correspondingly threaded end of the elongated body.

Expediently: ⁵ .se has the front of the head of this stopper, which should rest against the inner wall of the container where the pouring opening begins, which can be the inlet funnel into the outlet channel, so that the two together as Ver

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Sehlußalxäichtung acting surfaces as completely as possible against each other and ensure a tight seal of the pouring opening, i.e. the tapping hole.

According to an advantageous embodiment of the locking device according to the invention, the diameter of the elongated Body smaller than the inner diameter of the pouring opening. This facilitates the insertion during the assembly of the closure plug and especially later at the beginning of the Casting process read fast removal from the pouring opening encouraged.

In addition, the stopper according to the invention - at least its head and the elongated body - is deferred made of such a material that has better thermal conductivity than the refractory lining of the container in order to transfer the heat via the stopper to the inner wall of the pouring opening and to the tapping hole towards and towards the part of the wall which is in contact with the head of the plug.

The sealing plug is in the interests of simplified manufacture and in the interests of reduced material consumption preferably composed of three individual parts. The two shoulders are preferably with internal threads equipped to be screwed onto the externally threaded ends of the elongated body be able.

One embodiment of the stopper which is advantageous in practice consists in the fact that it has a stretched shape as an elongated body Cylinder and a conical cylinder (cone, double cone or truncated cone) as head,

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while the opposite shoulder as a threaded ring is designed »

SemaS a preferred embodiment of the invention Versohlußvorriohtung it is advantageous to the end of the elongated body that is outside of the vessel is to be provided with a predetermined breaking point in the form of a notch; the stopper then still shows floating ring (Flottierring), which längliehen over the Body is pushed and between the outer shoulder of the stopper and the outer wall of the vessel and has a Dioke, which is essentially the Distance between that notch and the surface of the outer wall of the vessel corresponds.

In this arrangement, the outer shoulder is supported against the outer wall of the vessel via the floating ring, in order to separate the inner part of the stopper from its outer shoulder, it is sufficient to attach the elongated body to break off the notch. After dropping the utter The switch and the floating ring, which is placed in between like a washer, remain in the wall the container protruding end of the elongated body are, so that the inner part of the stopper to Movement directed towards the interior of the container can be imparted by applying suitable pressure, to push the stopper inwards and with it the pouring opening to release.

So that this inner part of the stopper can be pushed into the liquid metal more easily, < snn the inner part of the stopper for releasing the pouring opening in motion is set, which points inside the container

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The lying shoulder of the plug expediently has a pointed shape at its outer end *

Further features and advantages of the invention emerge from the following description of a shown in the drawing Embodiment of the invention. The only figure in the drawing shows a cross section through one Part of a pouring pan with a pouring opening which is sealed by means of • iner ^ closure device according to the invention is.

A pouring pan, with which liquid metal is distributed onto casting molds, consists of a metallic housing 1 and a heat-resistant lining 2 as well as at least one inflowing nozzle j5 embedded in the ground for continuous Pour, the sinsi inlet funnel 4 and shown in the Execution at 3pj! .-? 1 a vertically extending cylindrical Has flow channel 5.

The pouring nozzle is used to fill the pouring pan j5 to be mixed. In addition, the one in the sectional drawing shown inventively designed stopper used. It is expediently made of graphite and is made up of several parts built up. The middle part is an elongated body in the form of an elongated cylinder 6, both ends of which are threaded are provided. On one of these ends, a pointed head 7 is screwed as a shoulder, which is screwed against the wall of the funnel 4 anliegb, while on the other end a screw nut 8 is screwed on, which via a floating ring 10 against the outer wall 9 of the vessel or the pouring nozzle 3 is supported by the head 7 in the funnel 4 to push in. The elongated cylinder 6 has a notch 11 as a predetermined breaking point, which is approximately

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• · ν> 111

■ II Il »111

is where the nut 8 against the floating ring is applied. The surface of the head 7 äes plug, which with the funnel 4 is in contact, has a fine machining, so that a perfect seal by this concern is guaranteed. The opposite end of the head 7, which is in contact with the metallic bath, is designed to be pointed so that the stopper can easily penetrate into the liquid metal when on the stopper a force acts in order to move its inner part for the purpose of releasing the pouring opening or pouring nozzle 3

The good thermal conductivity of the plug, guaranteed by the appropriate choice of material, especially when it is ais Graphite created 1st, causes a good heat transfer to the walls of the casting nozzle 3, the temperature of which is thus close the temperature of the liquid metal.

To open the pouring nozzle 3, the outer threaded end of the stopper onto which the screw nut 8 is screwed is broken off by the action of a shock in the seal, arrow 12. The break in the elongated body 6 takes place at the point of the notch 11, that is to say at the predetermined breaking point. In this way, the head 7 and the hereby connected. . The remainder of the elongated cylinder 6 is freed from the mounting bracket. Around those parts of the nooh stopper on the Sohüttpfanne towards the inside of the container. To set in motion, a force is applied to the cylinder 6 in the direction of its longitudinal scattering, i.e. in the direction of the PfO ¹ IeS 13>, which is sufficient to overcome the frictional forces that counteract a movement of those remaining parts of the stopper towards the interior of the container «The inwardly pushed part of the cylinder 6 with the head 7 of the stopper

q _

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So detaches itself from the pouring nozzle 3 and increases due to his slight specific face quickly appears through the metallic bath.

According to a modification compared to the embodiment shown in the drawing, only the head 7 *, that is, the shoulder of the stopper located in the interior of the container, consists of graphite; the remaining parts of the stopper and in particular the elongated, cylindrical body 6 consist of a material, for example metal, the specific weight of which is at least equal to that of the liquid metal bath in the pan i.st. The notch 11 serving as a predetermined breaking point is then moved towards the head 7; it is now located in a zone below the head 7 in the vicinity of the screw thread. It has been shown that the stress due to a lateral impact against the screw nut 8 propagates sufficiently through the elongated body 6 to also lead to breakage at a predetermined breaking point laid there. In this case the elongated body 9 falls due to its weight together with the screw nut 8 downwards out of the passage of the pouring opening, while the head 7, which has a lower specific weight than the mass of the metal ball, rises rapidly upwards, the initial phase of the ascending process thereby it is supported that pressure from the metal 3 acts on the inverted conical part of the head J which protrudes from the funnel 4.

The invention is not limited to the illustrated and described exemplary embodiments. It also includes everyone professional modifications and further training as well as partial and sub-combinations of the features and measures described and / or illustrated.

- Expectations -

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Claims (10)

1. Versohlußvorriehtung for the tap hole of a metallurgical vessel, in particular for the pouring opening of a Schüttpfmne for continuous steel casting, « characterized by a stopper with an elongated body (cylinder 6), which extends through the pouring opening (pouring nozzle 3) and two shoulders (head 7 * screw nut 8) has a larger diameter at its ends, one of which as a head (7) to the inner wall of the container (lining 2) at the inlet of the pouring opening (3), the other to the outer wall (9) of the? Container, is designed adjacent to the outlet of the pouring opening (3), at least one outer shoulder (7, 8) having an internal thread for receiving the end of the elongated body (6) provided with a corresponding thread. 2. Closure device according to claim 1, characterized »that the Vordarfläehe of the head (7) of the stopper, which at the inlet into the pouring opening (3) against the as T & iohter (4) designed inner wall (2) of the container rests, a pain processing for close to each other. 3 · Versohlußvorrichtung according to claim 1 or 2, characterized in that at least the head (7) of the stopper is made of a material whose specific weight is lower than that of the metal to be distributed through the pouring opening (3). 4. Closure device according to one or more of claims 1 Ms 3, characterized in that at least the head (7) and the elongated body (6) of the plug is designed from a material whose thermal conductivity is better than the thermal conductivity of the pouring opening ( 3) surrounding lining (2) of the inner wall of the vessel * 7534464 02/26/76 Mil ItCt Closure device according to one or more of claims 1 to 4, characterized in that the stopper is constructed in three parts, the two shoulders (7, 8) having internal threads for screwing to the externally threaded ends of the elongated body (6). 6. Versohlußvorrichtung according to any one of the preceding claims, characterized in that the plug consists of an elongated body in the form of an elongated cylinder (6) with a conical-cylindrical (frustoconical) head (7) as a shoulder and a screw nut.'sr (8 ) exists as the opposite shoulder. 7. Closure device according to one or more of Claims 1 to 6, characterized in that the elongate body (6) has a notch (11) as a predetermined breaking point. 8. Versohlußvorrichtung according to claim 7, characterized in that the end of the elongated body (6) protruding from the vessel has the notch (11) and that between the outer shoulder (8) of the plug and the outer wall (9) of the container A'ostandsring (Flottlerring lo) is pushed over the protruding end of the elongated body (6) that Dloke corresponds approximately to the distance between the notch (11) and the outer wall (9) of the container. 9. Versohlußvorriohtung naoh claim 7, characterized in that the elongated body (6) consists of a material whose specific weight is at least equal to that of the liquid metal in the vessel, and that the notch (11) below the head (7) close the thread. 7534464 02/26/76 10. Closure device according to one or more of claims 1 to 9, characterized in that the inner end of the head (7) facing away from the elongate body (6) has a taper to facilitate penetration into the liquid metal.