SU453664A1 - DEVICE FOR REGULATION OF RELATION OF EXPENSES - Google Patents

Description

one

The invention relates to devices for digital control of the cost ratio and can be used in devices for automatic continuous mixing of several components.

Devices for controlling the flow ratio are known, comprising a pulse generator, a generator connected to each channel through a frequency multiplier, an anti-coincidence circuit, an assembly circuit, a reversible counter, a digital-to-analog converter to a control valve, and a flow sensor connected via an anti-coincidence circuit to a reversible counter.

In order to improve the control accuracy, a modulation unit is installed in the device, one input of which is connected to a pulsed pulse generator, and another input - to the output of a reversible counter, and the output of the modulation unit is connected to the input of the assembly circuit.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 shows the execution of a comparison logic.

The device for controlling the cost ratio contains; pulse generator 1, frequency multipliers 2, anti-coincidence circuit 3, reversible counters 4, output digital-to-analog converters 5, electropneumatic converters 6, control valves 7,

flow sensors 8, assembly circuits 9, modulation units 10, electronic switches II, direct counting meters 12, comparison logic circuits 13, triggers 14, generator 5, counting

bits 16 counters 4 and 12, circuit “And 17, multi-input circuit assembly 18, circuit“ IE 19.

The operation of the device is as follows.

In the initial state before launching the device, in the comparison logic circuit, 13 pa inputs to all “And 17” circuits do not match, since the numbers in counters 4 and 12 are equal (have the value “O), and the inputs to“ And

connected to the opposite outputs of the counter bits counters. There is no signal at the input of the circuit 19, therefore, at its output there is a potential “1. Generator 1 is off, counters 4 and 12, trigger 14 are set to “O. The installation of the trigger 14 in “O” occurs with some delay, so that the removal of a single signal from the circuit 13 is passed before it is set to “O.”

After simultaneous switching on of generator 5 and generator 1, the continuous pulse sequence from generator 1 is fed to frequency multipliers 2, where the frequency of generator 1 is multiplied by the coefficients of the ratio specified by the channels.

The frequency from the output of the multiplier 2 in each channel goes through the anti-matching circuit 3 and the assembly circuit 9 to the input of the addition of counter 4.

At the same time, the frequency from the generator 15 is low and the open electronic key 11 is fed to the input of the counter 12, and through the assembly circuit 9 to the input of the addition of the counter 4.

Thus, at the addition input of counter 4, the frequency is several times larger than at the input of counter 12. Therefore, at first, the number in counter 4 grows faster than in counter 12. As a result, in some schemes “And 17 there is a coincidence of unit potentials, therefore, from the output of circuit 19 is removed "1. Removing " 1 from trigger input 14 does not change its state. Under the influence of feedback from sensor 8, the growth in the number in counter 4 slows down and finally completely

stops, the frequencies at its two inputs are equal.

Subject invention

A device for controlling the flow ratio, comprising pulse generators, one of which is connected to each channel through a frequency multiplier, an anti-coincidence circuit, an assembly circuit, a reversible counter, a digital-to-analog converter to a control valve, and a flow sensor connected via an anti-coincidence circuit to a reversible counter, characterized in that, in order to increase the control accuracy, a modulation unit is installed in it, one input of which is connected to another generator, the other input - to the output of a reversible counter, and the output of the modulation unit is connected to the input of the assembly circuit.

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