EP1146976B1 - Device for pouring cast iron into pig moulds - Google Patents

Description

The invention relates to a device for pouring cast iron into ingot molds, comprising in a ingot casting machine with ingot casting molds equipped endless conveyor belt for transporting the ingot molds from a pouring station to an ingot emptying station, and vice versa, wherein each ingot mold in the casting station as it passes through the casting device is filled with molten metal pointing upwards with molten metal from a transport container via a guide element, introduced into the mold troughs becomes.

Pig casting machines are known. Liquid pig iron is known to be either fed to a steel mill after tapping in the blast furnace using pans or, if it cannot be processed immediately, in the form of Ingots, the so-called ingots, for storage or further transport cast iron pig pots have according to the intended use different weights, usually one pig is about 6 kg heavy.

Generic casting machines are used for the production of pig iron to use. For example. describes the as yet unpublished patent application P 198 35 824.5 a pig casting machine, which consists of a Casting station, at least one endless conveyor belt and an emptying station for the solidified pigs at the deflection point of the endless belt. On each endless conveyor belt there are several ingot molds or Molds attached. After pouring molten material into the Ingot mold is transported to the emptying station, usually in Upward direction, by means of a feeder. When driving through the first Deflection point of the endless belt, each ingot casting mold is emptied automatically, and the solidified ingot in suitable containers or on a conveyor belt collected.

• Der Gießstrahl trifft auf der vollen Breite der Kokille auf, demnach auch auf den Stegen zwischen den eigentlichen Vertiefungen für die Masseln, den sogenannten Formmulden. Dies führt zum Wegspritzen von Eisen, wodurch das Gießband der Maschine durch anhaftende Eisenspritzer laufend verunreinigt und schließlich in seiner Funktion beeinträchtigt wird, wodurch unerwünschter Wartungsaufwand erforderlich wird.
• Bei Betriebsstörungen ist der Gießstrahl nicht kurzfristig unterbrechbar.
• Die Dicke der feuerfesten Schicht am Boden der Rinne und ihre äußere Verkleidung aus Stahlblech vergrößert die Fallhöhe des flüssigen Eisens in die Kokille und erhöht auf diese Weise die Neigung zum Spritzen und Überlaufen der Kokille.
• Die Vorderkante der Rinne unterliegt einem nicht unerheblichen Verschleiß, so daß sich der Ablaufpunkt des flüssigen Eisens im Laufe des Betriebes in der Horizontalen und Vertikalen nachteilig verschiebt.
• Die Rinne verfügt über keine Speicherkapazität für flüssiges Eisen, so daß einerseits Unregelmäßigkeiten der Eisenzuführung aus dem Transportgefäß, bspw. durch Verschleiß des feuerfesten Materials im Transportgefäß, nicht kompensiert werden können, und andererseits Badbewegungen in der Schmelze, die durch eine vergleichsweise große Fallhöhe des Eisens aus dem Transportgefäß bedingt sind, nicht gedämpft werden können und bis auf die Verhältnisse in der Kokille durchschlagen.

In such casting machines, the molten pig iron to be cast is poured from a transport vessel, for example a so-called torpedo car, into a fire-resistant, lined gutter which is slightly inclined towards the casting machine. This channel ends over the molds running around the machine's casting belt. The molten pig iron running through the channel falls freely into the mold over the end edge of the channel. The height of this edge above the mold is relatively large. The following problems arise with this type of feeding molten pig iron into the mold:

• The pouring jet strikes the full width of the mold, and therefore also the webs between the actual depressions for the ingots, the so-called mold troughs. This leads to iron being sprayed away, as a result of which the casting belt of the machine is continuously contaminated by adhering iron splashes and is ultimately impaired in its function, which necessitates undesired maintenance.
• In the event of malfunctions, the pouring stream cannot be interrupted for a short time.
• The thickness of the refractory layer at the bottom of the trough and its outer cladding made of sheet steel increases the drop height of the liquid iron into the mold and in this way increases the tendency to splash and overflow the mold.
• The front edge of the channel is subject to considerable wear, so that the point of discharge of the liquid iron shifts disadvantageously in the horizontal and vertical during operation.
• The channel has no storage capacity for liquid iron, so that irregularities in the iron supply from the transport vessel, e.g. due to wear of the refractory material in the transport vessel, cannot be compensated for, on the one hand, and bath movements in the melt, which are caused by a comparatively large drop height of the iron are caused by the transport vessel, cannot be steamed and penetrate to the conditions in the mold.

Document DE-A 2 850 563 describes the technology of a casting process with a ladle and the mechanization of the casting process.

Two alternately tilting pouring vessels are used. There is none trough-like part of a distributor, another level control in the inflow system the distribution channels. As a result, there is a lack of memory for the melt, which, however, to equalize the melt flow of is of great importance. The system is with an operational monitoring unit equipped in cooperation with a control device, but can a control of the melt inflow without a storage amount of melt do not work properly in advance.

The invention has for its object a device for pouring Cast iron, the type mentioned in the preamble of claim 1 to improve and to design that the aforementioned disadvantages, difficulties and Limits of technology are overcome, the design of the device should be so uncomplicated and clear that it can be used on any existing Pig casting machine can be used. Furthermore, the device according to the invention the highest safety requirements during operation correspond to a pig casting machine.

• ein als Verteiler ausgebildetes Leitorgan mit einem wannenartigen Teil zum Auffangen von Schmelze aus dem Transportbehälter unter Bildung einer Speichermenge, im Zusammenwirken mit
• einem Gießteil, das mit wenigstens einem rohrförmigen Ausguss ausgebildet ist, und beide Teile unter Freilassung einer kommunizierenden Öffnung in einer syphonartigen Wand einander funktionell zugeordnet sind, und
• der Verteiler mit seinem Ausguss in möglichst geringem Abstand oberhalb der Formmulden der Masselgießformen fest angeordnet und diesem zwecks zeitweiliger Unterbrechung des Austritts von Schmelze aus dem Ausguss bei gleichzeitiger Unterbrechung des Metalistrahls ein Verschlussorgan in Wirkverbindung mit einer fernbedienbaren Auslösevorrichtung, beherrschbar zur Betriebsüberwachung von einer Kontrolleinrichtung, zugeordnet ist, welcher
• eine Betriebsüberwachungseinheit zuordenbar ist, die mit der Kontrolleinrichtung der Gießstation derart zusammenwirkbar ist, dass bei Änderung oder Störung des Betriebszustandes der Masselgießmaschine eine entsprechende Änderung des Betriebes der Gießstation eingeleitet wird, bspw. Änderung der Transportgeschwindigkeit des Transportbandes bzw. der Badhöhe oder der Speichermenge von Schmelze im Verteiler, und dass zusätzlich für einen störungsfreien Betrieb der Anlage
• dem Verteiler eine Einrichtung zur Überwachung der Höhe des Schmelzebades zugeordnet ist, welche bei Über- oder Unterschreitung einer vorgebbaren Höhenmarge die Neigung des Transportbehälters entsprechend korrigiert.

In order to achieve the object, in the device for pouring cast iron into ingot casting molds of the type mentioned in the preamble of claim 1, an interaction of the following elements is proposed:

• a guide element designed as a distributor with a trough-like part for collecting melt from the transport container to form a storage quantity, in cooperation with
• a casting, which is formed with at least one tubular spout, and both parts are functionally assigned to one another, leaving a communicating opening in a siphon-like wall, and
• the distributor with its spout is arranged as closely as possible above the mold troughs of the casting molds and, for the purpose of temporarily interrupting the escape of melt from the spout and at the same time interrupting the metal jet, a closure member in operative connection with a remotely controllable triggering device, controllable for monitoring the operation of a control device is which
• an operational monitoring unit can be assigned, which can be cooperated with the control device of the casting station in such a way that a corresponding change in the operation of the casting station is initiated in the event of a change or malfunction of the casting machine, for example a change in the transport speed of the conveyor belt or the bath height or the amount of melt stored in the distributor, and that additionally for trouble-free operation of the system
• the distributor is assigned a device for monitoring the height of the molten bath, which corrects the inclination of the transport container accordingly if the predetermined height margin is exceeded or undershot.

In the device according to the invention, liquid iron becomes from a transport trolley first in a trough-like part of a distributor for collecting of the stream of molten metal, the distributor being poured through a siphon-like wall is divided into two parts, namely a collecting part for the jet of molten metal from the transport container, in which turbulent Current conditions prevail, being in the front part, the one tubular Pour has a soothing of the melt pool occurs. The one in Bottom of this part existing tubular spout can be so close every single ingot recess of the mold can be guided like this the mold edges allow. Advantageously, the device according to the invention is used for Pouring molten metal known construction principles in the Continuous casting of steel like known distribution troughs with adaptation to the special circumstances with a pig casting machine.

• Jede Massel-Formmulde wird separat gefüllt, es trifft kein Eisen auf die Grate zwischen den Vertiefungen.
• Die Ausgüsse unterliegen einem vergleichsweise geringen Verschleiß, der Aufgabepunkt in jede Formmulde ändert sich während des Betriebes nur in vernachlässigbaren Größenordnungen.
• Der Aufgabepunkt des flüssigen Eisens kann näher an die Kokille herangeführt werden, als bei einer Rinnenkonstruktion. Die Spritzneigung wird verringert.
• Der oben liegende Gießteil des Verteilers mit einer vorgebbaren Speichermenge an Gußeisen stellt einen ruhigen und gleichmäßigen Zufluß an flüssigem Metall sicher.
• Die Speichermenge im Verteiler kann Zeiten, die für einen Wechsel zu einem neuen Transportgefäß benötigt werden, überbrücken, ohne daß die Anlage in ihrer Funktion angehalten werden muß.
• Das Funktionsprinzip der erfindungsgemäßen Gießvorrichtung ist unabhängig von der genauen Anzahl der eingesetzten Gießrohre und der Form des Verteilers. Die Vorrichtung kann daher an jeder Gießmaschine eingesetzt werden, die auf dem Prinzip einer Masselgießmaschine für Roheisen funktioniert.

The use of the distributor according to the invention has the following advantages:

• Each ingot mold is filled separately, no iron hits the ridges between the wells.
• The spouts are subject to comparatively little wear and tear, the point of application in each mold trough changes only negligibly during operation.
• The point of application of the liquid iron can be brought closer to the mold than with a channel construction. The tendency to spray is reduced.
• The cast part of the distributor located at the top with a predeterminable storage amount of cast iron ensures a smooth and even inflow of liquid metal.
• The amount of memory in the distributor can bridge times that are required for a change to a new transport vessel without the system having to be stopped in its function.
• The principle of operation of the pouring device according to the invention is independent of the exact number of pouring tubes used and the shape of the distributor. The device can therefore be used on any casting machine that works on the principle of a pig casting machine for pig iron.

Details, features and advantages of the invention will become apparent from the following Explanation of an embodiment shown schematically in the drawing.

The device for pouring cast iron in Ingot casting molds 1 comprises in an ingot casting machine one with ingot casting molds 1 equipped endless conveyor belt 2 for transporting the ingot molds from a pouring station 3 to an ingot emptying station, and vice versa, each ingot mold 1 in the casting station 3 as it passes through the casting device with the mold cavity pointing upwards with molten metal is filled from a transport container 4 with a pouring jet 5 over a Guide is introduced into the mold troughs.

The guide element is a distributor 6 with a trough-like part 7 for collection the beam 5 of the molten metal from the transport container 4 with formation a storage amount 8, and with a casting 9 with at least one tubular Spout 10 formed, with the release of a communicating lower connection opening 11 in a common siphon-like partition 12 are assigned to each other.

The distributor 6 is with its spout 10 at a comparatively short distance arranged above the mold cavity of the ingot casting molds 1. This will make a Spraying of liquid cast iron and thus contamination and damage of the endless conveyor belt 2 of the ingot casting machine avoided.

Because the distributor 6 has a storage amount 8 of liquid metal, in particular Cast iron, must contain, for example, during a change of the transport container 4 or in the event of a fault in the ingot casting machine, a temporary interruption the escape of molten metal from the spout 10 and occasionally an interruption of the metal beam 5 may also be possible. To this Purpose is associated with the tubular spout 10, a closure member 13. The Closure member 13 has one from above through the melt pool 14 on the Spout opening 10 plug which can be placed on, with a remote control Tripping device 15 is operatively connected.

The triggering device 15 is controlled by a control device 16 for monitoring the operation controlled, so that in the event of a business interruption automatically closes the spout 10.

The ingot casting machine can preferably have an operational monitoring unit 17, which are associated with the control device 16 of the casting station 3 interacts in such a way that when there is a change or malfunction in the operating state the ingot casting machine a corresponding change in the operation of the Pouring station is initiated. For example. can change the transport speed of the endless conveyor belt 2 a change in the bath height or Storage amount 8 of liquid metal can be set in the distributor 6.

And finally, the distributor 6 is a device 18 for undisturbed operation assigned to monitor the height of the melt pool 8, which at Exceeding or falling below a predetermined height margin the inclination of the Transport container 4 corrected accordingly. This will make the outflow Cast steel 5 or the amount of molten metal flowing out.

The principle according to the invention of the casting device for molten metal, in particular Cast iron, in ingot casting molds is independent of the number used Pouring tubes 10 and the shape of the distributor 6 or its trough-like Part 7 and casting part 9. The device can on any casting machine for liquid metal can be used, which works on the principle of a pig casting machine, For example, for pig iron, works. The use of the invention Pouring device is in view of the development of new high performance ingot casting machines essential.

LIST OF REFERENCE NUMBERS

1

pig casting

2

Endless conveyor belt

3

casting station

4

transport container

5

pouring stream

6

distributor

7

tub-like part

8th

amount of memory

9

casting part

10

Spout

11

connecting opening

12

partition

13

obturator

14

melting bath

15

triggering device

16

control device

17

Operation monitoring unit

18

Bath level monitoring

Claims (1)

1. Device for casting cast iron in pig casting moulds, comprising an endless transport belt (2), which is equipped with pig casting moulds, for transporting the pig casting moulds (1) from a casting station (3) to a pig emptying station and conversely in a pig casting machine, wherein each pig casting mould (1) is filled with molten metal in the casting station (3) during transit through the casting device with the mould trough facing upwardly, the molten metal being introduced into the mould troughs from a transport container (4) by way of a guide element, characterised by a co-operation of the elements:

   a) a guide element, which is constructed as a distributor (6), with a sump-like part (7) for collecting melt from the transport container (4) with formation of a reserve quantity (8), in co-operation with

   b) a casting part (9), which is formed with at least one tubular pouring outlet (10), and the two parts (7, 9) are functionally associated with one another while leaving free a lower communicating connection opening (11) in a siphon-like intermediate wall (12),

   c) the distributor (6) is fixedly arranged with its pouring outlet at the smallest possible spacing above the mould troughs of the pig casting moulds and this is, for the purpose of temporary interruption of the exit of melt from the pouring outlet (10) with simultaneous interruption of the metal stream (56), associated with a closure element (13) in operative connection with a remotely controllable trigger device (15) and controllable, for operational monitoring, by a checking device (16), with which

   d) an operational monitoring unit can be associated, the unit being co-operable with the checking device (16) of the casting station (3) in such a manner that in the case of change in or disturbance of the operational state of the pig casting machine a corresponding change in the operation of the casting station is initiated or change in the transport speed of the transport belt (2) or the bath level or reserve quantity (8) of melt in the distributor (6), and that in addition for a disturbance-free operation of the plant

   e) a device (18) for monitoring the level of the melt bath (8) is associated with the distributor (6) and in the case of the falling below or exceeding of a predeterminable level margin correspondingly corrects the inclination of the transport container (4).

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