METHOD OF AUTOMATIC CONTROL OVER FEEDING RATE OF COAL CUTTER-LOADER AND DEVICE FOR ITS REALIZATION Russian patent published in 1996 - IPC

FIELD: mining industry. SUBSTANCE: settings rated and cut-off currents are specified, momentary current of electric motor of cutting drive of coal cutter-loader is measured and effective current is found by formula. Its value is compared with setting of rated current and momentary value of current is compared with specified cut-off current. Value of effective current is kept at level of rated current of electric motor of cutting drive. Instantaneous decrease of feeding rate is performed when current of electric motor of cutting drive exceeds cut-off current. Device for realization of method incorporates two channels. One of them includes squarer, aperiodic unit, square root computer, proportional unit with insensibility zone and adder connected in series. The other channel presents low-frequency filter which input is linked to output of current pickup. Output of filter is connected to input of proportional unit with insensibility zone which output is linked to mechanical unit controlling feeding rate of coal cutter-loader. EFFECT: enhanced reliability of automatic control over feeding rate. 2 cl, 3 dwg