SU1418665A1 - Device for metering liquids - Google Patents

Abstract

The invention relates to film technology. Allows you to increase the accuracy of dosing and reduce the amount of commissioning. The purpose of the invention is to improve the accuracy of the device. To do this, a metering pump with an electromagnetic drive, a power amplifier, a performance setting unit and a generator are entered into the device, serially connected counters, a reset circuit, a multi-input element I, a trigger and a two-input element I. A stable frequency generator is used for dosing the spacing between the bursts of pulses applied to a powerful amplifier controlling the electromagnet is applied. In order to automatically select the pump capacity from the technological setpoint controller, the second productivity setpoint, the second multi-input AND element, the switch, the OR element and the inverter are also entered into the device. 1 hp f-ly, 2 ill. W (L

Description

00 С35 О5

sd

The invention relates to devices for volumetric dosing of liquids and can be used in the cinema and chemical industries. industry.

 The aim of the invention is to improve the accuracy of the device in a wide; |; and adjustment range. I In Fig. 1, a functional diagram of the device with one set of ohms is presented (adjustment factor 999); FIG. 2 is a functional diagram of a device with two setpoint adjusters (coefficient adjustable 4 and 199).

I The device contains a pump 1 (Fig. 1 4 with an electromagnetic drive 2, force 3 power, setpoint adjuster 4; | 1 hours; generator 5 stable Frequencies, serially connected Decimal counters 6 and 8, circuit 9 (transfer, multi-input element And 10,

trigger 11 and two-input element And 12. The gauge 4 consists of contact switches 13, each in 10 positions,

I The generator 5 is connected to the first stroke of the element I 12 and to the counting input of the counter 6, the outputs of the counters 6-8 are connected to the corresponding inputs of the switches 13 of the setpoint 4} and the last outputs of the counters 6-8 are also connected to the inputs of the circuit 9 of the jumper, the output of which is connected to B-trigger input 11 and c. In the installation of zero meter counters 6-8. The outputs of the two switches 13 of the dial 4 are connected to the inputs of the multi-input element I 10, the output of which is connected to the R input of the trigger 11.

The output of the trigger 11 is connected to the second input of the two-input element IN2, the output of which is connected to the power amplifier 3, the control electromagnet 2 of the pump 1.

In the setting device 4 (FIG. 2), the first of the switches 14 has two fixed positions, and the first of the counters 15 is a frequency divider by 2. A second setting device 16, consisting of the switches 17 and 13, is also introduced, the second multiple input element And 18 switch 19, the element OR 20 and the inverter 21. The outputs of the setpoint 16 are connected to the inputs of the element. And 18, the switch 19 is connected to the power supply terminal and to the input of the first multi-input element

that AND 10 directly, and to the input of the second multiple input element And 18 through an inverter 21,

The outputs of the elements 10 and 18 through the element OR 20 are connected to the R input of the trigger 11,

The device works as follows.

In the proposed dosing device, the interval between bursts of pulses varies.

The duration of the cycle of operation of the device T ,, is equal to the product of the period Tj of the pulse of a stable frequency generator by the regulation factor

,, Q “ke

K p - min device performance

(one)

(2)

Omiks Q.

t / HUM

frequency is often25

those generator known device with the same performance.

F q t.

(3)

Where

T is the time set from the performance sensor, during which pulses from a stable frequency generator are fed to the electromagnetic drive of the pump within one cycle; 0

F f

DAN COP

(TO

stable frequency generator 5;

q - unit dose of the pump.

Therefore, the expression of the performance of the device for. dosage can be obtained from equation (3)

T

q-T Cycle cycle duration

(4) in the device

is determined by using serially connected decade counters 6-8., looped by a reset circuit 9 and counting the number of pulses in a cycle.

Ty iuiKf

TO

-y

R

(five)

where follows la equal

what is the duration of the cycle- (6)

The duration of time T is determined by the same counters, they are counted by T T T

31418665

the number of pulses p is determined by the pulses per pump F equal to 1 Hz, the unit 4 of the pump performance should be equal to the unit dose of the pump when one pulse is applied

  Tg. Q-K V 99. , 6.6 ml, from where F 60. 1

T Ti, -n. (8) where 60 is the number of seconds in 1 min.

When turning on the power supply voltage. Pulse repetition period T

reset circuit 9 sets counters 1.

10 V- 1 s. to zero. Gst

Generator 5 (phg. 1) is stable. The duration of the cycle and the frequency equation is continuously supplied to the counters (2) TC-T - -Cr 199 s. 6-8 pulses. Counters count the number of pulses in a cycle according to the number of pulses in a cycle of the PS, defined - (5).

in accordance with the formula (5), after which the circuit For providing such a reset period 9 sets the counters 6-8, the generator 5 of a stable frequency can be zero (resets them), and the count is on. - contain the quartz resonator begins first. A reset pulse of one 100 kHz t divider by 10. The output signal is simultaneously supplied to the trigger input with the frequency of such a generator 11, set at its output potential-20 1 Hz.

The high-level digital, which, when connected to the input of the reset circuit, is connected to input element I 12, permits the following meter outputs: first passing of the output pulses, counter 15 - output 1; the second counter 5 through element I 12 at the input of the gate - output 9; the third counter 8 is the power amplifier 3, and then the output 9. the electromagnet 2 of the metering pump 1. After the passage of 199 pulses

Using the setpoint device 4, which consists of all the counters, is reset to zero, from the contact switches 13, the trigger is set to the condition that the tenth number n is taken, the corresponding high level of signal 1 is determined by its pump performance. 30 exit. The next pulse of the generator When at the corresponding outputs, is the first for the next cycle, this number appears in the counters, it and it passes through the two-input pulse through the puller. . Contact switches, as a result of which, at its output also setters 4 and 16, have the following signal that appears. the number of positions: switches, pushes the R input of the trigger 1 and tilts the connected to the output of the third counter to the initial state. At the same time „in h.

„,„ Ka, - 10 positions with digitization from

two-input element and 12 closes- “Q ,,„ etc. .. denoting produced, and ceases to skip the output of hundreds of ml / min; switch the generator 5 pulses to the pump. connected to the output of the second

Obviously, from the beginning of the cycle to, ..

and -10 counters, - 10 positions, tenths of this moment through the element I 12 per / MP / min; switches connected

the pump passed impulses, the number of co- / m.

data to the output of the first counter - 2

TOP is equal to the number of n., Psh /

 positions 0 and 5, units ml / min.

When executing a device with two, “msh ™ 1, ™ nn,

setting devices 4 and 16 (fig, 2). maximal-.

QMQKC Pump Performance Challenge Pump Performance

.995 ml / min, minimum 5 ml /. Conducted with a discreteness of 5 ml /

/ min Adjustment factor is pro / min.

Qmax. For example, the manufacturer specified

the productivity of the Kr device is 345 ml / min. According to the equation

 MWH,.) During each cycle at the pump

The magnitude of the unit dose and the stabilizer, through the two-input element And 12, passes the number of pulse frequency Fj. are related by equation 55

F..n 69.

 q Q "4H

For convenience of calculation and for charging. This number is set on the on-line counters that take the frequency of the supply with the switches, when the capacity of 345 ml / min is set on them,.

The first switch 14 by digit 5 is connected to output 1 of the first counter, where the counter divides by 2, the second switch 14 by digit 4. is connected to output 4 of the second counter, which, taking into account the division coefficient HHJH of the first counter, is 2 2 "4-8, and the third switch 13 with number 3 is connected to the output 3 of the third counter, where it will be counted to 210-3 60. The sum of all three units is 60 + 8 + 1 69.

I When counters 15, 7, and 8 count this number of pulses, 1, 4, and 3, respectively, appear at | high signal levels that through a switch go to the multi-element element 10 and tilting trigger 11, as a result of which the passage of pulses to the pump stops.

14186656

Thus, the use of a stable frequency generator, such as a quartz oscillator, significantly increases the stability of the operation of the device (reduces the error) during fluctuations in ambient temperature and during long-term operation.

In addition, as a result of the post. 1Q Noah, stable frequency of pump srabatshan hydrodynamic losses are constant, and, accordingly, stable

becomes a single dose of the pump. The adjusting characteristic of the turn is linear, and the additional error disappears.

Introduction to the scheme of the device of the second unit of performance, the second multi-input element AND, the switch of the leader tape -. the film, the RShI element and the inverter will allow automatically (from the technological sensor. Record - film) to choose the pump performance set by the setpoint device.

A: A switch 19 is used as the switch 19, for example, distinguishing a transparent leader from an opaque film. When the position of the switch 19 is open, the high voltage across the resistor R is applied to the fourth input of the element 10, preparing it for operation, and the low voltage from the output of the inverter 21 is supplied to the fourth input of the element 18 of 1 | 1ira. In this case, the pump operates with a capacity set on the setpoint switches 4.

If the switch 19 is closed, the pump operates with the capacity set on the setpoint switch 16.

 The arrival of the signal at the R input, trigger 11 from the output of the elements AND 10 or 18 is carried out through the scheme OR 20.

From expressions (6) and (8) it follows that the duration of time T (and T in the proposed device is determined by

by counting a certain number of periods- 50, the input of which is connected to the output of the TC genera, following with frequency. Consequently, the accuracy of determining the time. Tz and T is determined by the stability of the generator

rator, and the output to the S-input of the trigger and to the installation inputs of the meters, the outputs of the setter are connected to the corresponding inputs of the first element

it is stable

becomes a single dose of the pump. The adjustment characteristic becomes linear, and the additional error disappears.

Introduction to the scheme of the device of the second unit of performance, the second multi-input element And, the switch leader -. the film, the RShI element and the inverter will allow automatically (from the technological sensor. Record - film) to choose the pump performance set by the setpoint device.

 for film or setting device 16 for

leader tape This makes it possible to use one: a pump instead of two with a fixed capacity.

Claims (1)

1. A device for metering liquids, comprising a metering pump with an electromagnetic drive, a power amplifier, a performance setting device and a generator, characterized in that, in order to improve the accuracy of the device, it contains serially connected meters, as well as a reset circuit, the first And element, the trigger and the second element And, and the generator is connected to the first input of the second element And with the score-. input of the first counter, the outputs of the meters are connected to the corresponding inputs of the performance master, and the last outputs of the meters are also connected to the corresponding first inputs of the reset circuit, the second the input of which is connected to the output of rator, and the output to the S-input of the trigger and to the installation inputs of the meters, the outputs of the setter are connected to the corresponding inputs of the first element frequencies that can be sufficiently 55i, the output of which is connected to the R-BXOn large, and since these values of the trigger associated with the output are input .in expression (4) producer-the second input of the second element AND, accuracy, we offer the input of the power amplifier connected to The device is very high. .the output of the second element is And, and the output of FIG.