NOVELTY - The arc furnace electrode lifting and lowering apparatus (10) has main controller (14) that stops the ascending and descending operation of the electrode (2) based on the stop signal, in which the electrode position determining unit (12) determines whether the moving distance is greater than a first threshold value, and outputs the stop signal when the first threshold value is smaller than a second threshold value having a value smaller than the first threshold value.
USE - Arc furnace electrode lifting and lowering apparatus for rope forming, in which scrap is dissolved by generating discharge between electrode and scrap.
ADVANTAGE - Since an electrode movement distance calculation unit outputs the movement distance of the electrode based on the rotation speed of the electric motor, and an electrode movement distance calculation unit determines the position of the electrode based on the movement distance of the electrode and outputting a stop signal for stopping the ascending/descending operation of the electrode, thus, it is possible to recognize the upper limit position and the lower limit position of the electrode and stop the raising and lowering operation of the electrode without detecting the upper limit signal and the lower limit signal and in effect, it is possible to back up the limit switch without being subject to hardware restrictions.
DESCRIPTION OF DRAWING(S) - The drawing shows the block diagram of the arc furnace electrode lifting and lowering apparatus. (Drawing includes non-English text).
Electrode (2)
Arc furnace electrode lifting and lowering apparatus (10)
Electrode position determining unit (12)
Main controller (14)
Electric motor (22)