RU1818620C - Device for control of weighing machine - Google Patents

Abstract

Usage: instrumentation. SUMMARY OF THE INVENTION: the device comprises a concentration sensor, a regulator, a divider, a pulse generator, a reversible counter, a digital-to-analog converter, a comparison unit, an I element, a power amplifier, a current meter. 1 ill.

Description

The invention relates to the field of dosing and can be used in dosing systems with pulsed dispensers.

An object of the invention is to increase the accuracy of dosing.

The drawing shows a schematic diagram of a device.

The device comprises a concentrator 1, a controller 2, a reversible counter 3, a pulse generator 4, a counter-divider 5, a digital-to-analog converter 6, a comparison unit 7, an And 8 element, a power amplifier 9, a pulse metering device 10, a current meter 11. a converter 12.

The device operates as follows.

When the adjustable parameter (concentration of a substance in solution), measured by concentrator 1, is turned off, a signal imbalance occurs in the measuring circuit of the controller, for example P25.1, as a result of which control pulse signals are generated at the controller output, which should change the dispenser performance to the side unbalance reduction to zero. These signals are fed to the input of the reversible counter 3 with a polarity that depends on the sign of the control signal from the controller. The counter 3 begins to add or take pulses coming from the generator 4. pre-divided by the counter-divider 5. The current output code of the reversing counter 3 is converted by the digital-analog converter 6 into an analog signal displayed by the current meter 11. At the same time, the output code of the reversing counter 3 is fed to the first input of comparison block 7. The counter-divider 5 code is received at the second input of the comparison block. When the state of the counter-divider 5 is less than the state of the reverse counter 3, the comparison block 7 has an output De signal, when the signal of the divider counter exceeds the state of the reverse counter, there is no signal from the output of the divider circuit.

Counter-divider 5 forms two counting cycles - the first worker, he counts from zero to the end and the second - pause - he counts from zero to a certain value that determines the duration of the pause.

The counting cycle is determined by the presence of a signal at the second output of the divider counter,

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00

with

Os N O

which is connected to the AND element 8, the first input of the AND element is connected to the comparison unit 7.

When two signals are present at the input of AND element 8, a signal is present at the output, if at least one signal is missing at the input, there is also no signal at the output.

Thus, the pulse divider at the output of AND element 8 is determined by the state of the reverse counter 3, which is generated in the first duty cycle. There is a pause between duty cycles, the value of which is determined by the time the signal is present at the second input of the divider counter.

The pulse from the output of element And 8 is amplified by a power amplifier 9 and then goes to the input of the dispenser 10. The readings of the current meter 11 are proportional to the duration of the output pulse, and therefore to the dose of the reagent supplied to the process.

The dose of the reagent determines its concentration in the solution (pulp).

Claims (1)

SUMMARY OF THE INVENTION Dispenser control device comprising a concentration sensor connected to a regulator other than in order to increase accuracy, a reverse counter, a comparison unit, an And element, a power amplifier, a current meter, a digital-to-analog converter, a divider and a pulse generator are inserted into it, the output of which is connected to the input of the divider, the first output of which is connected to the first input of the reverse counter, the second input of which is connected to the regulator, the output of the reverse counter through the digital-to-analog converter is connected to a current meter and directly to the first input of the comparison unit, the second input of which is connected to the second output of the divider, the third output of which connected to the first input of the And element, the second input of which is connected to the output of the comparison unit, and the output of the And element through the power amplifier is connected to the output bus.