SU825938A1 - Mining machine automatic load regulator - Google Patents

Description

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The invention relates to the mining industry and can be used cp automatic control of the speed of the movement of mining machines, the benefits of wine coal mining and mining combines.

The automatic load controllers of the mining machine are known for automatically controlling the speed of movement of coal mining and tunneling machines, depending on the load of the electric motors and a given feed rate, which contain driving and measuring elements of the feed rate and load of avigatepey, comparison elements, logic and burdock pulses l | in {.2j.

A disadvantage of the known regulators is the presence of a delay between the time of the occurrence of the release signal and the beginning of its adjustment by the regulator, which leads to a decrease in the quality of regulation.

Also known is the automatic regulator of the load of the mining machine, which contains the reference and measuring elements of the feed rate, the load of the main motor and the end-cutter engine, comparison elements, logic elements AND and OR, a pulse element and a relay element with a dead zone. 31.

The disadvantage of this automatic regulator of the load of the mining machine is the lack of synchronization of the pulsed element with the error signal, as a result of which the regulator begins to work out the mismatch ve at the time of its occurrence, and with a delay, the duration of which is determined by the 8tc period of the sawtooth pulse generator ), the magnitude of its output sawtooth voltage at the time of the occurrence of the dissociation of the magnitude of the mismatch.

The purpose of the invention is to increase the speed of the controller by synchronizing

the moment of the start of the regulating impulse action with the moment of occurrence of the signal mismatch signal, exceeding the static zone insensitivity of the load regulator, as well as an increase in the dynamic accuracy.

The goal is achieved by the fact that the automatic load controller of the mining machine is equipped with a second relay element with a dead zone, the inputs of which are connected to the outputs of logic gates And and Or, and

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output - to the input of the pulse element

The drawing shows a functional diagram of the proposed automatic load controller of a mountain mashina.

The load regulator contains measuring elements 1 of the feed rate, 2 loads of the feed engine and 3 loads of the main engine, feed elements 4 of the feed speed, 5 loads of the feed engine and 6 loads of the main engine, elements 7j 8- and 9 of the comparison, and fire elements 1О И; and 11 OR, pulse element 12, relay element 13, relay element 14, the inputs of which are connected to the outputs of logic elements 10 and 11, and the output to the input of pulse element 12.

The relay element 14 consists of threshold elements 15 and 16, the inputs of which are connected to the target: 17 dead zones.

The autoregulator works as follows.

The signals from the measuring elements 1–3 and the setting elements 4–6 arrive at the comparison elements 7–9, the error signals from which arrive at the logical elements 10 AND and 11 OR. The inputs of the logic element, 1O And the signals of the error are received in the event that the measured values of the controlled parameters are less than the specified ones. The inputs of the logic element 11 or the error signals are received when the measured values of the controlled parameters are greater than the specified values.

Thus, the signal at the output of the logic circuit 1O And appears in the case if the values of all controlled variables are less than the specified ones. The magnitude of the signal is proportional to the smallest of the error signals. The signal at the output of the logic circuit 11 OR appears in the event that at least one of the measured values of the regulable values is greater than the specified value. The magnitude of this signal is proportional to the largest of the error signals.

Logic Output

10I includes a relay element 13 to increase the feed rate of the rock maschine. The pulse element 12, which is a sawtooth generator, switches off the relay element 13 when the value of the sawtooth voltage exceeds the output signal of the logic circuit 10 I. Thus, the proportion of the regulating action of the relay element of the autoregulator to the smallest of the mismatches entering the logical input schemes 10 I.

Logic Output

11IL includes a relay element 13 to reduce the feed rate of the mining machine. Pulse element 12, turning off the relay element 13, when the value of its ramp output voltage exceeds the output signal of the logic circuit 11. OR, it is proportional to the regulating effect of the auto regulator relay element to the largest of the mismatches at the input of the logic circuit 11 OR proportional to the corresponding error signals.

At the point in time when the output signal of the logic circuit 10 AND (11 OR is above the signal of the deadband setpoint generator 17, the threshold element 15 (16) is turned on and starts the pulse element 12 regardless of its state at this time point. This synchronizes start generating a sawtooth voltage pulsed element

12 and the inclusion of the relay element 13 since the occurrence of the error, the value of which exceeds the static dead zone of the load regulator. Thus, the dead zone of the second relay element 14 must be chosen equal to the static dead zone of the load regulator provided by the relay element 13.

Performing an automatic regulator of the load of the mining machine with the second relay element 14 provides a more accurate conversion of the magnitude of the error signal into a regulating effect, since the comparison of the signal

the mismatch with the pipiform voltage of the pulsed ejecta 12 is realized at the instant of time, when the latter is more progressively zero. At the same time, the dynamic characteristics and quality of regulation of the load regulator are improved, as a result of which the productivity of the mining machine is increased and the service life of its electric motors is increased.

Claims (3)

1. Author's certificate No. 346714, cl. Q 05 O 29/00, 1970. 2. USSR author's certificate N 347744, cl. Q 05 O 29/60, 1970. 3. USSR author's certificate J 317794, cl. E 21 C 27 / OO, 1969.