US 4,742,528 A · Compensation for power feed line weight in weight measurement devices

Abstract

A compensation device for the influence of the weight of a power feed line on a weight measurement device determining the weight of an electrode and/or the melting rate in an electro-slag remelting process, in a vacuum arc furnace or the like. When an x-y device is adjusted, a weight jump occurs due to the forces of the power cable or the forces of the bellows, which has a disturbing effect on the rate definition. This weight jump can be prevented by means of mechanical devices, or can be made so small that it no longer constitutes a disturbance. However, the expenditure for this is disproportionately high. The invention is more cost efficient, since hardware or software means suffice. The weight function G=f(t) is extrapolated and compared with the actually measured weight G'=f(t). The magnitude of the difference between the two is stored and later added as a correction value.

Claims16

Dependent claims

A method for compensating for the influence of the weight of a power feed line in a weight measurement apparatus for the weight of an electrode during melting in electro-slag remelting processes, in vacuum arc furnaces and the like, the influence varying for each lateral change in position of the electrode, the method comprising the steps of:

identifying a first function G=f(t), wherein G is the predicted weight of an electrode, the first function including a correction value;
identifying a second function G'=f(t), wherein G is the actual weight of the electrode;
predicting the weight G of the electrode utilizing the first function for each lateral change in position of the electrode during melting, during a time interval .DELTA.t;
weighing the electrode during each time interval .DELTA.t to determine the actual weight by utilizing the second function;
and,
determining the difference .DELTA.G between the predicted weight and the measured weight at the end of each time interval .DELTA.t, each .DELTA.G being factored into the first function as the correction value for the next subsequent predicting step, whereby the actual weight of the electrode can be accurately predicted and current supplied thereto can be precisely controlled to optimize the melting.

3 more elements

Dependencies are inferred from the claim text.

Compensation for power feed line weight in weight measurement devices

Life of this patent

Compensation for power feed line weight in weight measurement devices

Life of this patent

Abstract

Claims16