Coupling element for underground mining machines - is esp. for roller coal cutters, connecting control line with contacts

摘要

The control line intrinsically safe circuit is connected through a transformer with contacts in a pressure resistant and protected from firedamp chamber. Parallel capacitors are inserted into the transformer (14) secondary circuit (6). One of them is in series with a switch (10) tripping control commands for the mining machine, while the other short-circuits the transformer (14) at the end of the control line (6). A multivibrator (15) in the transformer (14) primary circuit is followed by three band-pass filters (16-18) connected in parallel, with different pass bands. They control through a relay each (19-21) circuits (26-27) of signaling device (28, 29) or a circuit (25) of an electric unit (11).