Metal founding – With signal – indicator or inspection means
Patent
1986-02-24
1987-11-24
Godici, Nicholas P.
Metal founding
With signal, indicator or inspection means
164449, 164453, 164457, 73290R, 324204, B22D 200, B22D 1118
Patent
active
047081910
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for indicating the level in metallurgical vessels, more particularly tundishes for the casting of molten steel into ingot molds, comprising electromagnetic coils that are arranged in the wall of the vessel with axes directed to the bath and are developed as primary or transmitting coils connected to alternating current and as secondary or receiving coils, and whose alternating voltages induced in direct relation to the bath level serve as input signals for a data processing unit.
In this type of device, such as, for example the device disclosed in Printed West German Unexamined Patent Application No. OS 27 22 214 and U.S. Pat. No. 4,144,576, the transmitting coil and the receiving coil are provided separately in the refractory lining at various points of the vessel, e.g. in the area of the corner of a melting furnace on two adjoining or two opposing walls of a vessel. With this design, a special cable consisting of an inner wire, a heat-resistant ceramic insulation and an outer steel pipe are used to form the coils. In principle, separate coil arrangements are relatively expensive and cumbersome during assembly, because each coil must be mounted separately at the assigned point of the vessel lining, whereby the cooperating coils must be aligned accurately to each other so as to obtain usable output signals.
SUMMARY OF THE INVENTION
The present invention has as its object the simplification of the apparatus for indicating with a higher degree of accuracy the level in metallurgical vessels through better design and arrangement of transmitting and receiving coils.
This object is achieved according to the present invention by providing transmitting and receiving coils combined into a measuring unit having at least one transmitting coil extending in the direction of the fill height and at least two height-adjustable receiving coils assigned thereto. Thus, the transmitting and receiving coils can be housed with ease and with less effort in the vessel during the construction of the refractory lining, since the coils have already been combined into a measuring unit before installation and are aligned from the functional standpoint to the metallurgical vessel to be fitted out. Thus, an adjustment of the individual coils in special positions in the vessel wall is no longer required. In this case, the term measuring unit is to be understood as a coil unit combined with means for holding, binding, connecting or the like and which is prefabricated with respect to particular, special measurement-engineering requirements of a metallurgical vessel.
According to the invention, a measuring unit has proved to be especially advantageous consists of a system formed of bare wires on insulators and comprised of transmitting and receiving coils and refractory material with electrically insulating properties poured therearound. In this way, a structural unit can be fabricated which can easily be inserted into the refractory lining of the vessel with simple means and which can appropriately be mounted in the back lining using mineral wool, easily detachable mortar or the like in order to facilitate the separation of the measuring unit during the renewal of the vessel lining. It has also proved to be advantageous to use a frame or a shape which carries the transmitting and receiving coils and which consists of a fireproof, electrically insulating material and guide slots, e.g., in the form of cracks in which the coil wires are embedded and can be embedded and can be filled in with a mortar equivalent to the refractory material.
In particular, a measuring unit is recommended which has a transmitting coil with a field flux that is different in the direction of the fill height and in which the receiving coils are arranged in different field-flux areas of the transmitting coil. In this way, the characteristic curve on which the voltages are plotted can rise substantially linearly. This means that the strength of the measuring signal increases as the fill level rises.
REFERENCES:
patent: 4144570 (1979-03-01), Wagner
patent: 4144756 (1979-03-01), Linder
patent: 4212342 (1980-07-01), Linder et al.
patent: 4279149 (1981-07-01), Block
patent: 4441541 (1984-04-01), Block
Basler Urs
Block Franz-Rudolf
Pesovic Branislav
Theissen Wolfgang
Godici Nicholas P.
Heinrich Samuel M.
Stopinc Aktiengesellschaft
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