EP0025520A1 - Installation for measuring and conveying molten metal - Google Patents

Abstract

1. Installation for measuring and conveying molten metal, consisting of a gastight container (8) having an intake and offtake, with which smelt can be removed from a smelt container (1) or holding furnace or conversely from which smelt can be conveyed, for example, into a molten bath, characterised in that the intake (9) is at the same time the offtake (9) of the container (8) and the common intake/offtake (9) can be connected to a pipe system (5) which is present in the smelt container (1), in such a way that, by tilting or application of an excess pressure in the container (8), the smelt present in the container (8) is conveyed wholly or partially out of the container (8), and, upon the filling operation of the container (8), the smelt can no longer flow back into the molten bath of the smelt container (1).

Description

The invention relates to a device for metering and transporting metal melts, consisting of a gas-tight container with inlet and outlet, with which melt is removed from a melt container or holding furnace or vice versa, from which melt can be conveyed.

Various devices have become known with which certain quantities of liquid metal can be dispensed using the principle of communicating vessels according to the principle of compressed gas production.

From US-PS 30 58 180 a device is known with which certain amounts of a melt can be poured. For this purpose, a gas overpressure is generated in a storage vessel so that the height of the liquid metal therein is lowered and a corresponding amount of the liquid is pressed out or poured out of an outflow pipe. To control the amount of gas required in the storage container, pyrometers are placed in the filling openings as probes.

In the previously known device, the tightness of the storage vessel is limited, since the device is constructed on the principle of communicating vessels and is thus connected to the non-closable pouring or outlet openings.

In addition, accurate dosing is not possible because the discharge can only be interrupted by setting a pressure, and in particular if too much liquid metal has been poured out, it is no longer possible to automatically carry out a reflux or to suddenly stop the process.

A device has become known in GM-PS 1,100,475 in which liquid metal is conveyed from a tight and heated storage vessel by means of gas pressure through an overflow pipe into an open vessel. The liquid metal is ent from this neither for the continuous feeding of continuous casting equipment or intermittently for filling molds. The controlled dispensing is achieved in that a pouring opening located on the bottom is opened or closed with a stopper. As a result, metered quantities of liquid metal can only be poured off with limited accuracy.

In DE-OS 23 43 100 a pressurized gas-operated dosing device for liquids, especially liquid metals, aggressive acids and alkalis has become known, which consists of a sealed collecting container with an inlet pipe, the inlet pipe in the form of an angle lifter or a drain on the side or on the bottom of a melting container leads to a container serving as a metering device, which is provided with a weighing device, wherein different gas pressures for transporting the liquid from the melting container into the metering container and when the desired amount in the metering container is reached to interrupt the flow can be set in the containers.

However, the metering device mentioned has the disadvantage that the metering container is firmly connected to the melting tank through the inlet pipe or the outlet, and that it is therefore not possible to transport the metering tank with the precisely determined amount of the melt contained therein.

The present invention is therefore based on the object of providing a device for metering of the type mentioned at the outset, which not only allows the metering process to be carried out by simple manipulations, but also with which precisely metered melt can be transported and transported to other locations, with filling and dosing operations can be carried out sequentially in a rational manner.

To achieve the object, a device for metering and transporting metal melts of the type mentioned at the outset, consisting of a gas-tight container with inlet and outlet, with which melt is removed from a melt container or holding furnace, or vice versa, from which melt is conveyed into a molten bath can, which is characterized in that the inlet is at the same time the outlet of the container and the common inlet can be connected to a pipe system located in the container for the melt, in such a way that the container by tilting or applying an overpressure in the container all or part of the melt contained therein is conveyed out of the container or during the filling process of the container the melt can no longer flow back into the melt pool of the melt container.

Further refinements of the invention are contained in the subclaims.

With the dosing device according to the invention, the advantage is achieved that the filling and dosing process can be carried out quickly and efficiently and that the container containing the dosed melt can be easily transported and fed to other locations.

The device according to the invention will be explained in more detail by way of example with reference to the drawing.

The drawing shows a schematic diagram of the device according to the invention.

The container 1 for the molten metal is provided with a container cover 2, while the valves 3 are provided for the negative pressure, excess pressure and ventilation.

4 with a valve for the sealing device is designated.

A pipe system 5 projects into the container 1 and can be connected to the common inlet and outlet 9 of the metering container 8. The dosing container 8 sits on a weighing system 6 and has a float inside for measuring the fill level.

A seal 10 is provided at the outlet of the inlet or outlet 9. With 11 a channel or an outlet is designated. The measuring devices are connected via a transmitter 12 to an input device 13 and a process computer 14, which in turn is connected to an output unit or a printer 15 and a terminal 16. 17 with a compressed air line for the nitrogen and 18 a vacuum line to the vacuum pump is designated. The bearing 19 serves for emptying the metering device 8, the channel 11 or the outlet being drawn under the outlet opening of the inlet or outlet 9. The common inlet and outlet is arranged so that it begins at the bottom of the dosing container 8 and is at least with its inlet and outlet opening above the level of the filling of the dosing container 8.

The function of the device for dosing and transporting molten metals has the following function.

The molten metal, which is located in the container 1 or in a holding furnace, is conveyed into the metering container 8 via the pipe system 5 and the common inlet or outlet 9.

• 1. Im Behälter 8 wird ein Unterdruck erzeugt, der bewirkt, daß der über dem Schmelzbehälter 1 wirkende Luftdruck die Schmelze über das Rohrsystem 5 und den gemeinsamen Zu- und Ablauf 9 nach dem Dosierbehälter 8 befördert.
• 2. Im Behälter 1 wird ein Überdruck erzeugt, der bewirkt, daß die Schmelze in der gleichen Weise in den Dosierbehälter 8 gedrückt wird.

There are two options.

• 1. A vacuum is generated in the container 8, which be has the effect that the air pressure acting over the melting tank 1 conveys the melt via the pipe system 5 and the common inlet and outlet 9 to the dosing tank 8.
• 2. An excess pressure is generated in the container 1, which causes the melt to be pressed into the metering container 8 in the same way.

• 1. Der Behälter 8 ist zusammen mit dem Zu- und Ablauf 9 starr angeordnet, wobei das Rohrsystem 5 derart beweglich angeordnet ist, daß es je nach Bedarf mit dem Zu- und Ablauf 9 verbunden werden kann.
• 2. Das Rohrsystem 5 ist starr angeordnet, und der Dosierbehälter 8 kann dagegen so weit bewegt werden, daß, je nach Bedarf, das Rohrsystem 5 mit dem Zu-und Ablauf 9 verbunden werden kann.
• 3. Das Rohrsystem 5 sowie der Behälter 8 sind beweglich angeordnet, so daß sie bei Bedarf miteinander verbunden werden können.

So that the melt can be transported from the melting tank 1 to the dosing tank 8, the pipe system 5 must be tightly connected to the inlet or outlet 9. This can be done in several ways.

• 1. The container 8 is rigidly arranged together with the inlet and outlet 9, the pipe system 5 being arranged such that it can be connected to the inlet and outlet 9 as required.
• 2. The pipe system 5 is rigidly arranged, and the dosing container 8 can be moved so far that the pipe system 5 can be connected to the inlet and outlet 9 as required.
• 3. The pipe system 5 and the container 8 are movably arranged so that they can be connected to each other if necessary.

When the dosing container 8 has reached its desired filling weight, which can be determined by a wide variety of measuring methods, and the pipe system 5 has been removed at the common inlet and outlet 9, dosing of the metal in FIG. 8 can be started.

• 1. Das Metall wird über einen im Behälter 8 aufgebrachten Überdruck 9 aus dem Behälter gedrückt. - Die Menge, die den Behälter verläßt, kann wieder durch die verschiedensten Meßmethoden ermittelt werden. Hat die gewünschte Menge den Behälter verlassen, wird durch einen schlagartigen Abbau des Überdrucks der Ausfluß gestoppt.
• 2. Das Metall wird durch eine Schwenkbewegung des Behälters 8 über den gemeinsamen Zu- und Ablauf 9 aus dem Behälter 8 gegossen. Auch hier kann die Menge, die aus dem Behälter fließt, auf die verschiedensten Arten gemessen werden. Hat die gewünschte Menge den Behälter verlassen, wird durch einen sofortigen Stopp der Schwenkbewegung ein weiteres Ausfließen verhindert.

There are basically two options.

• 1. The metal is pressed out of the container via an overpressure 9 applied in the container 8. - The amount that leaves the container can again be determined using a wide variety of measurement methods. Once the desired quantity has left the container, the outflow is stopped by a sudden reduction in the excess pressure.
• 2. The metal is poured out of the container 8 by a pivoting movement of the container 8 via the common inlet and outlet 9. Again, the amount that flows out of the container can be measured in a variety of ways. If the desired quantity has left the container, an immediate stop of the swiveling movement prevents further outflow.

Depending on requirements, a new filling process or a new dosing process can be initiated.

Since the dosing container 8 is not firmly connected to the pipe system 5, it can also be used as a transport container at the same time.

The whole system can be easily connected to a process computer 14, whereby the various weights can be dosed in any order and the individual processes can be initiated. In addition, the entire system is operated with nitrogen via the feed line 17, with all points where there is a risk of oxidation being covered with nitrogen gas which is supplied with a slight positive pressure above the critical points in relation to the prevailing air pressure.

Claims (11)

1. Device for metering and transporting metal melts, consisting of a gas-tight container with inlet and outlet, with which melt is removed from a melt container or holding furnace or vice versa, from which melt z. B. can be transported into a molten bath, characterized in that the inlet (9) is also the outlet (9) of the container (8) and the common inlet (9) with one in the container (1) for the melt Pipe system (5) can be connected, such that the container (8) 'is wholly or partly transported out of the container (8) by tilting or applying an overpressure in the container (8) or during the filling process of the container (8 ) the melt can no longer flow back into the melt pool of the melting tank. 2. Device according to claim 1, characterized in that the common inlet (9) of the container (8) with the pipe system (5) is tightly connectable. 3. Apparatus according to claim 1 or 2, characterized in that the container (8) together with the inlet and outlet (9) is rigidly arranged, while the pipe system (5) in the melting tank is arranged such that it can be moved as required can be connected to the inlet (9). 4. Apparatus according to claim 1 and 2, characterized in that the pipe system is rigidly arranged and the container (8) is movable such that the pipe system (5) can be connected to the inlet (9) as required. 5. Apparatus according to claim 1 or 2, characterized in that the pipe system (5) and the container (8) are arranged such that they can be connected to one another if necessary. 6. The device according to one or more of the preceding claims, characterized in that a vacuum can be produced in the container (8), which causes that when the inlet (9) is connected to the pipe system (5) that is above the melt Air pressure conveys the melt from the melting tank (1) into the tank (8). 7. The device according to one or more of the preceding claims, characterized in that an overpressure can be produced in the melting tank (1), which causes that after connecting the inlet (9) with the pipe system (5), the melt after the container ( 8) is promoted. 8. The device according to one or more of the preceding claims 1 to 6, characterized in that the container (8) is subjected to an overpressure for emptying. 9. The device according to one or more of the preceding claims 1 to 7, characterized in that the container (8) can be tilted for emptying. 10. The device according to one or more of the preceding claims, characterized in that all corresponding places where there is a risk of oxidation of the melt are protected with a slight excess pressure of nitrogen. 11. The device according to one or more of the preceding claims, characterized in that the common inlet (9) is arranged so that it begins at the bottom of the metering container (8) and at least with its inlet and outlet opening above the level of the filling of the dosing container (8).

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