Apparatus for controlling the operation of tipping a melting crucible
AssigneeLeybold-Heraeus GmbH
InventorsFriedrich-Werner Thomas, Jurgen Bruch
Life of this patent
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Abstract
In automatic melting crucible tipping it is important that, starting from a certain angular position, the melting crucible (1) is tipped according to a predetermined model until emptying is complete. This model can be obtained, for example, by the so-called teach-in process and can be stored in an analog or digital memory (89). In order to prevent abrupt movement of the crucible (1) when the molten material touches the pouring lip (3) of the crucible (1) when the pour-lip angle has been reached, according to the invention a correction arrangement (108, 109, 37) is provided which enables the tipping process to proceed continuously and without abrupt movements even in the case of different pour-lip angles.
Claims16
An apparatus for controlling the tipping of a melting crucible for pouring molten material, comprising:
- a control means for controlling the tipping of the melting crucible;
- a memory connected to the control means, said memory storing an ideal pouring control curve for controlling the tipping of the melting crucible;
- said control means, under ideal conditions, being responsive to the ideal pouring control curve to control the tipping of the melting crucible from at least an ideal initial pour point angle .alpha.PL when the material begins to pour out of the crucible, and continuing to control the tipping of the melting crucible until the melting crucible has been completely emptied at which point the melting crucible is tipped at an ideal end pour point angle .alpha.E;
- said ideal pouring control curve being a continuous function .alpha.=f(t) in which .alpha. represents the tipping angle of the melting crucible and t represents time;
- and
- a correction circuit for converting the continuous function .alpha.=f(t) for control of pouring under ideal conditions into a corrected continuous function .alpha.'=f.sub.1 (t) for control of pouring under actual conditions, said correction circuit taking into account an actual initial pour point angle .alpha.'PL and deriving the corrected function .alpha.'=f.sub.1 (t) based on the difference between .alpha.PL and .alpha.'PL,
- said corrected continuous function having the actual initial pour point angle .alpha.'PL, at a point in time t.sub.A, and, at the end of the crucible pouring operation at a point in time t.sub.E, at which said corrected function has an actual end of pouring angle .alpha.'E which is identical to the ideal end of pouring angle .alpha.E.
Dependencies are inferred from the claim text.