Frequency signals used to control rolling mill stands - to eliminate multiple connections and permit very rapid stand change

摘要

Process for monitoring, controlling and adjusting the electrical equipment on rolling mill stands, esp. on interchangeable stands receiving command signals transmitted by a master controller. The novelty is that the commands are transmitted by frequency signals. The frequency signals are pref. transmitted by radio, or by carrier frequency using the mains electricity supply cable. The pref. devices include a transmitter and receiver on both the master controller and the mill stand, with coding and decoding appts. at both locations. When the mains supply is used to carry the signals, press. contacts and inductive energy transmission elements are pref. employed. In modern rolling mills, rapid stand change is essential but existing quick-action connectors with 80-100 contacts do not function properly in the arduous and dirty working conditions. Using the invention, only the mains supply requires connection so that poor connections do not impair the standard and actual control signals.