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Abstract

An electronic control method and apparatus for controlling the sloughing strokes in sloughing machines for coal and other minerals, has a stroke frequency generator which supplies recurrent signal codes to parallel-connected inlet and outlet stroke generators. Power amplifiers are connected to the stroke generators for amplifying command pulses therefrom, the pulses being supplied to inlet and outlet valves of the machine. A signal code is supplied from the stroke frequency generator through a divisor in a freely selectable clock sequence to the outlet stroke generator or alternatively the divisor releases the command pulse from the outlet stroke generator to the outlet valve in a freely selectable clock sequence. The apparatus for carrying out the control method contains a control unit for each sloughing machine, comprising a freely adjustable stroke frequency generator, a divisor for the adjustable ratio of the number of inlet stroke frequencies to the outlet stroke frequencies, at least one inlet stroke generator, at least one outlet stroke generator and the respective power amplifiers. AND gates can also be used between the frequency generator and the amplifiers. To prolong the opening period of the outlet valve without overlapping the opening period of the inlet valve, for example, there may be connected between the stroke frequency generator and the inlet stroke generator, an AND gate with an inverted input from the divisor.

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