SU1506284A1 - Method and apparatus for weight measurement of set flow rate - Google Patents

Abstract

The invention is intended to measure with the aid of a scale and a chronometer the amount of a substance that has arrived in a measured period of time. To improve the accuracy of determining the flow rate in the electromagnetic balancing system, a signal is introduced that creates their unloading by an amount slightly higher than the calculated value of the weight of the substance entering the container during the time from the beginning of its supply to the onset of the steady state. The measurement of the length of time is carried out at the time of the set of two predetermined dose settings, the first of which corresponds to the magnitude of the weight deviation created, and the second to the maximum value of the dose. In scales 1, a vessel 9 is installed, into which a liquid flows through valve 10, the flow rate of which is measured. The imbalance sensor 19, the amplifier 20 and the inverse converter 24 form an electromagnetic balancing system. Using a discriminator 27 with setpoint adjusters 29 and 30, two weight settings are set, on reaching which the chronometer 33 is turned on and off. Before a measurement is started, in order to increase its accuracy by carrying out a post-transition mode with the help of a step-current generator 36 of opposite polarity with respect to the compensation current, the balance is unloaded with the help of unit 36. 2 s.p. f-ly, 1 ill.

Description

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shegos mode. The measurement of the length of time is carried out at the time of the set of two predetermined dose settings, the first of which corresponds to the magnitude of the weight deviation created, and the second to the maximum value of the dose. On scales 1 a vessel 9 is installed, into which a liquid enters through valve 10, the flow rate of which is measured. The imbalance sensor 19, the amplifier 20 and the inverse converter 24 form an electromagnetic system

balancing. Using a discriminator 28 with setpoint adjusters 29 and 30, two weight settings are set, on reaching which the chronometer 33 is turned on and off. Before a measurement is started, in order to increase its accuracy by carrying out a post-transient mode using a step current of opposite polarity with respect to the compensation current, the scale of 1.2 s.p. f-ly, 1 ill.

This invention relates to a weight measuring technique.

The purpose of the invention is to increase strength.

The method of weight measurement of the consumption of a substance is as follows.

After calibration, the weights are discharged (jammed) by supplying an electromagnetic balancing system of negative polarity weights with respect to the compensation balancing current to the inverse coil of the inverter, and the amount of unloading is created in excess of the calculated value of the weight of the substance entering the tank. during the time from the beginning of its delivery to the onset of the steady state of its arrival, while setting two settings for the weight of the dialed dose, the first of which The first is equal to the weight corresponding to the unloading of the balance, and the second, to the maximum dose during dose collection, measures the time between the weight gain points corresponding to the specified setpoint values, then by dividing the weight of the dose by the time it was set, calculate the average value of the substance consumption.

The drawing shows a diagram of a device for weight measurement of the flow rate of a substance in which the proposed method is implemented.

The device contains scales 1, installed through support 2 and pillow 3 on base 4 and having a sensitivity regulator 5, an end prism 6 with suspension 7 and a receiving platform B for a vessel 9 in which

Through a rotatable valve 10, from the reservoir 11 having control knobs Start 12 and Stop 13, liquid 14 is supplied.

Scales 1 also have a string 15, a spring 16 of the mechanism 17 for sampling a container, the skip 18 of the unbalance sensor 19 connected to the amplifier 20.

The device also contains an adder 21, momentless current leads 22 to the coil 23 of a magneto-electric inverter 24, a reference resistor 25, a readout block 26, for example, an analog-to-digital converter from the board 27, a discriminator 28 with set points norm 29 and more than 30 and with corresponding output channels the norm 31 and more than 32, the chronometer 33 from the board 34, the switch 35, the unit 36 of the stepped current of negative polarity-, with respect to the compensation current +1, the correction unit 27, the switch 38, the time relay 39.

The device works as follows.

In the absence of 1 vessel on the scales, they are balanced by means of converter 24 by connecting switch 38.

After installation on vessel receiving platform 8 of vessel 9, its weight is displayed on display 27 of counting unit 26 due to voltage variation on reference resistor 25 due to change in compensation current 1p.

The scales are calibrated by means of a spring 16 and, in addition, a current is supplied from block 37 to coil 23,

until the compensation current 1 becomes zero and, accordingly, the readings on the scoreboard 27 also become zero.

Then, the required settings (lead) for the output signal of the readout block 26, which enters the discriminator 28, are entered — setpoints are normal and larger, corresponding to the initial position of the balance 1, when the readings on the board 27 are equal- O, and the final position of the balance 1 when the readings on the scoreboard 27 are equal to the value of the highest dialed dose.

Next, from the setpoint 36 through the switch 35 is fed to the adder 21 a current of 1p, negative polarity, the value of which corresponds to the set unloading of the balance,

This current entering the coil 23 creates an initial deviation (upward) of the pad 8 of the scale 1, while the amplifier 20 produces a compensation current of a corresponding magnitude, with the result that the corresponding value is displayed on the display board 27.

After the transition process, the balance returns to its original position, when btp is O,

The discriminator 28 in this position of the balance does not work, because a setpoint is entered in it, which is large for the value of current I,;, which compensates the current value -1.

Then, the supply of the liquid 14 to the vessel 9 from the reservoir 11 is started through the turnable valve 10.

After the end of the transient time, caused by the initial impetus of the falling liquid, which does not exceed the time required to push a liquid into vessel 9, the weight of which is equal to the value specified by the current — 1 weight balance 1, the fluid flows through the valve 10 in the steady state and reads on board 27, the approach to zero begins to decrease.

When these readings pass through the zero value, which was previously set by the norm setpoint, the discriminator 28 is processed and the signal from its output 31 starts the chronometer 33, which starts counting the times observed on the board 34.

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The dose set continues.

When the dose is set, the value of which corresponds to the second setting on the discriminator 28, a signal is turned off at its second output 32, turning off the chronometer 33.

The signal from the output 32 poslaet also on the relay 39 time, which after a specified delay time turns off the flow of fluid from the tank 11.

This is necessary so that the termination of the outflow of fluid from the valve 10 does not disrupt the measurement process in a steady state.

Claims (2)

1. The method of weight measurement of the steady-state consumption of a substance, consisting in the fact that the dose value is initially set, the substance is fed into the container installed on the scale, then the set dose time is determined, after which the average flow rate is calculated by dividing the weight of the dialed dose by time its set, characterized in that, in order to improve accuracy, before starting the supply of a substance, an electromagnetic effect is exerted on the balance, which creates unloading by an amount that exceeds the calculated value of the weight of the substance entering the container during the time it starts admission, set two settings for the weight of the dialed dose, the first of which is equal to the weight corresponding to the unloading of the scale, and the second - to the maximum dose, to measure time m Between the moments of weight gain, corresponding to the set value of the settings. 2. A device for weight measurement of a steady-state consumption of a substance, containing a balance with a dose collection container, an electromagnetic balance system of a balance with an unbalance sensor connected through an amplifier to the coil of an inverter, a readout unit, the input of which is via a reference resistor coi71506284 8 dinen with amplifier output, and chrono-to output of the reading unit, outputs A discriminator meter is connected to the inputs. that, with the chain of increasing the accuracy, the inlet and the stop of the chronometer, and the step controller has been introduced; the step controller of the current is connected through current a discriminator with two control switches with coil Kami signal levels and a switch, the converter oppositely accepts the discriminator input connected to the amplifier output.