SU1091025A1 - Device for metering liquids of variable concentration - Google Patents

Abstract

A DRAINING DEVICE FOR LIQUIDS OF THE LINE CONCENTRATION containing a container with loading and unloading units suspended on weight sensors connected to a weighing unit, and a control system with a dose setting device and an output unit connected to the loading and unloading units, however, in order to increase the dose accuracy of dosing by taking into account the concentration of liquid in the tank, the tank is made asymmetric in a vertical plane, and the control system is in the form of an adder, two dividers, a computing unit a, two comparison elements, a concentration unit, one output of the weighing unit is connected to one input of the adder, another output to one input of the first divider and to another input of the adder, the output of which is connected to another input of the first divider, with one input of the second comparison element, To the other input of which the dose sensor is connected, and to one input of the second divider, the other input of which is connected to the output of the first through the numerator-sg unit (L divider, the output of the second divider is connected to one input of the first the comparison element, the other input of which is connected to the concentration setter, and the output is connected to one input of the output unit, the other input of which is connected to the output of the second comparison element.

Description

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The invention relates to a weighting technique and may be used, for example, with the use of building materials for weight dosing of slurry-like liquids.

A known liquid weigher of variable concentration contains a measuring container with a level indicator supplying and discharging liquid valves and a float flj.

In this metering unit, the dose limiter, which is part of the level gauge, is mechanically installed, the float is subject to fluctuations from the waves, and the average concentration of liquid at the surface is measured, and not the total volume, which is the cause of unsatisfactory dosing accuracy.

The closest to the technical essence of the invention is a device for dispensing liquids of varying concentration. containing a container with loading and unloading units: suspended on weight sensors connected to a weighing unit and a control system with a dose setter and output unit connected1: yes to loading and unloading units 2 ,.

A disadvantage of the known arrangement lies in the unsatisfactory accuracy of dosing when working with liquids, the concentration of which E31 changes as it enters the dispenser tank.

The purpose of the invention is to increase the metering accuracy by taking into account the concentration of the liquid in the container.

This goal is achieved by the fact that in a dosing device for liquids of variable concentration, containing a container with loading and unloading units suspended on weight sensors, connected to a weighing unit, and a control system, with a dose setting device and a parallel unit connected to loading units and unloading capacity is made asymmetrical in a vertical plane, and the control-eni system is in the form of an adder, two dividers, a viewing unit, two comparison elements, a concentration unit, and one output to the weight the terminal block is connected to one input of the adder, - another output - to one input of the first divider and to another input of the adder, the output of which is connected to another input of the first divider, to one input of the second comparison element f to another input of which the dose setter is connected, and one input the second divider, the other input of which is connected with the output of the first divider through the computing unit, the output of the second divider: is connected to one input of the first element of the HTTA comparison, the other input of which is connected to the setpoint controller (Gracky, and the output from the bottom of the input of the output block, the other Bcode of which is connected to us}, the year of the second element comparison ;,

On fi1 „I shows the device; in fig. 2 - embodiment

containers (cut}; on FI 1. 3 the same, plan view.

The device contains a capacity of 1, a corner; ate 2 loads of liquid; a node 3;

4 unloading, weighing unit 5 sensors fa weight, analog-digital converter 7, control system 8

5 composition of which includes sum 1.1.1 9, the first divider 10, the computing unit 11, the second divider 12, the first element of comparison 13, the unit 1h

liquid concentration, the second element of comparison 15, unit 16 dozes to the output unit 17 o

Capacity 1 is filled with asig - .. 1; metric in a vertical plane in such a way that when the volume of the dosed liquid is changed, the center of gravity is so severe that

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X,

coordinates of the center of gravity of the dosage

liquids;

V

volume dosed

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-Sod F% analog to digital

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Pregdtel 7 is connected with one eazov.

VkhoMmator 9, and the output P with

10 and the input of the first divider; the input of the adder is 9,

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You od su; - dmator 9 is connected

with another input of the first divider 10, with one input of the second element of the match 15 and with one input of the second divider 12. the first divider 10 is connected to the number block 11J which is connected with its output; another input of the second divider 12 The output of the second divider 12 and the outlet of the limiting device 1 "of the concentration of liquid is connected to the inputs of the first element with the distribution 13.

The outputs of the elements of comparison 13 and Ij are connected to the output block 17 associated with the nodes 2-4, the Sensor 16 is connected to the element of comparison 1

The device works as follows.

Before starting the dosing, the operator, using the dose setting device 16 and the concentration controller 14, establish the required weight of the dose and the dose concentration,

In the dosing process, a liquid of varying concentration through the loading unit 2 enters the tank 1, and the signals P and P2 appear at the outputs of the analog-digital converter 7. The signal P is removed from the weight sensor (s), away from which the center of gravity of the metered liquid is displaced when it fills the bone 1. The signal P is removed from the weight sensors (sensor), towards which the center of gravity of the metered liquid is displaced when it fills the tank 1. The signals P and P are added for the purpose of determining the weight P of the liquid being metered in adder 9, the output of which goes to the input of the first divider 10, the second divider 12 and the reference element 15. The signal Pj is also fed to one of the inputs of the first divider 10, into which P is divided into P. From the output of the divider 10, the signal is fed to the input of the computing unit 11, which is arif A metric unit, in which, by dividing Pj by P, the geometrical parameters characterizing the location of the weight sensors 6 relative to each other and relative to capacitance 1 and the geometrical dimensions of capacitance 1, the volume V of the metered liquid is calculated by the formula. For example, in relation to the measured capacitance shown in FIG. 1, a formula for calculating the volume V named after it {(ЗХб-Ь У9х | + bbxi -3b - 9xi-3b a 4tg-f is the abscissa of the center where X is the tin of the dosed liquid; force , the current weight sensor, to the side of which the center of gravity of the dosed liquid is displaced, P is the weight of the dosed liquid, a is the width of the measuring capacity, b is the length of the base of the measuring capacity, d is the distance from the weight sensor, away from which the displacement of the center of gravity of the dosed liquid, to the measuring capacity; 1 - the distance between the weight sensors; H - the angle between By the vertical and inclined side of the measuring capacitance, From the output of the computing unit 11, a signal proportional to V is fed to one of the inputs of the second divider 12, to the other input of which a signal is received that is proportional to the weight P. In this block, by dividing P by V, the average concentration of dosed is determined The signals for the actuation of the load nodes 2, 3 and the discharge node 4 are generated in the control unit 17, the inputs of which are connected to the outputs of the elements of comparison 13 and 15. On the element of comparison 13, whose inputs are the output of ate 12 and 14 output the setpoint concentration, the average concentration of the dispensed liquid is compared with a predetermined end ntradieyd dose. On the comparison element 15, the inputs of which are the output of the adder 9 and the output of the setting device 16, the weight P of the dispensed liquid is compared with the specified weight P of the dose. The implementation of the control system 8 of the device for dosing liquids of variable concentration is possible on the basis of a standard microprocessor. The use of the proposed device will improve the accuracy of dosing, save dosing components and ultimately improve the quality of products.

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Claims (1)

VARIABLE CONCENTRATION LIQUID DISPENSING DEVICE, comprising a container with loading and unloading units suspended on weight sensors connected to a weight measuring unit, and a control system with a dose adjuster and output unit connected to loading and unloading units, characterized in that in order to increase the accuracy of dosing by taking into account the concentration of the liquid in the tank, the tank is asymmetric in the vertical plane, and the control system is in the form of an adder, two dividers, a computing unit, d hi comparison elements, concentration adjuster, with one output of the weighing unit connected to one input of the adder, another output with one input of the first divider and with another input of the adder, the output of which is connected to another input of the first divider, with one input of the second comparison element, to another the input of which the dose adjuster is connected, and one input of the second divider, the other input of which is connected through the computer to the output of the first divider, the output of the second divider is connected to one input of the first element the other input of which is connected to the concentration adjuster, and the output is connected to one input of the output unit, the other input of which is connected to the output of the second comparison element. SU., „1091025> Ί O 91 O 2 5 ϊ