RU1805333C - Liquid density meter - Google Patents

Abstract

Usage: light industry. SUMMARY OF THE INVENTION: The meter is based on estimating the density of a liquid by measuring its viscosity by the Stokes method. The introduction of additional electronic units into the meter allows, along with the density, to determine the linear weight of the sizing material on the basis of. 2 ill.

Description

The invention relates to techniques for measuring the density of liquids and can be used, in particular, in light industry.

The purpose of the invention is to expand the functionality of the meter by measuring the linear weight in the study of sizing materials based on.

In FIG. Fig. 1 is a structural diagram of the elements of the meter associated with technological equipment; Fig. 2 is a structural diagram of the elements providing the operation of the computing unit and the output of measurement results.

The meter contains a software relay 1, which controls the operation of the elements, the first electric motor 2 and the second electric motor 3, which provide rotation of their own drums, the first electromagnetic clutch 4 and the second electromagnetic clutch 5, kinematically connecting the shafts of the electric motors and drums while the probes are in initial conditions, the first drum 6 and the second drum 7, on which cables with probes and weights are attached, the first probe 8 and the second probe 9, which are sensitive to the forces of buoyancy and resistance to movement in liquid, the first cable 10 and the second cable 11, with which the probes are mounted on the drums, the first additional cable 12 and the second additional cable 13, on which the balances are mounted on the drums, the first load 14 and the second load 15, respectively, reducing the speed of immersion of the first probe 8 and providing the ascent of the second probe 9, the first marker 16 of the angle of rotation and the second marker 17 of the angle of rotation, issuing single pulses at the moments of the next rotation of the corresponding drum on

00

eat s

With

s

h

a predetermined angle, a sensor 18 of the lower level, which gives a resolving potential at the moment of separation from the dressing when its level is reduced and replaces this potential with a prohibitive potential when touching the dressing in case of raising its level, a sensor 19 of the upper level, which gives a resolution potential at the moment of separation from the dressing when lowering its level: the inhibiting potential after touching the dressing when it is raised, trigger 20, which controls the operation of the elements connected to its outputs, the first element And 21, which controls the voltage supply circuit to the valve in the dressing supply line 22, th the cut which the dressing is added to the glue box of the sizing machine, a measuring roll 23, the number of full turns of which characterizes the length of the sizing base, a sensor for the length of the base 24, which generates single pulses at the output each time the measuring roll 23 is rotated by a predetermined angle.

In addition, the meter contains a delay element 25 for switching on the computing unit, the first driver 26, the second driver 27, the third driver 28 and the fourth driver 29, leading the shape of the input pulses to the form necessary for the operation of the subsequent elements of the meter circuit, the second element And 30, passing pulses of the sensor for the length of the base) 4 during the consumption time of the determined volume of the dressing, the first counter 31, the second counter 32 and the third counter 33, summing the pulses supplied to the counting inputs of the first angle indicator 16 that of the second rotary angle marker 17 and the base length sensor 24, respectively, the first information input unit 34 and the second information input unit 35, with the aid of which information is entered into the meter on the density of absolutely dry dressing material and the running density of the base material, first register 36. the second register 37 and the third register 38 storing the code values of the measured true glue, the density of absolutely dry sizing material and the linear density (tex) of the base material, respectively, computational a unit 39 for calculating the measured value of the linear weight of the sizing material on the basis of a digital-analogue converter, converting the code of the measured value of the linear weight of the sizing material on the basis to a proportional analog voltage, an indicator 41 that displays the measured value of the linear weight of the sizing material on the basis.

The device operates as follows.

After performing the next measurement through the opened first element And 21

a control voltage is applied from the input of the meter to the valve 22 of the dressing supply line. The valve opens and the dressing is added to the glue box to the level determined by the regulator of the level of dressing in

0 adhesive box sizing machine. When the desired level is reached, the voltage from the input of the meter is removed. The valve in the dressing supply line closes. Topping up the dressing stops

5, during sizing, due to ablation of the sizing from the substrate being processed, the level of sizing in the adhesive box of the sizing machine is reduced. At some point in time, the top sensor will detach

0 level 19 from the dressing surface. The resolution potential that appears at the output of the sensor is applied to the single input of trigger 20 and puts it in a single state. The inhibitory potential appearing at the zero output of the trigger 20 is blocked at the first input of the first element And 21, which excludes the possibility of opening the valve 22 and topping up. charge during measurement. The resolving potential from the single output of the trigger 20 includes the shaper 26 and the software relay 1. The first shaper 26 generates a single pulse at the output, which zeroed the first counter 5 counter 31 and the second counter 32.

In addition, this pulse is applied to the input of the delay element 25, which delays for a predetermined period of time. Software relay 1 goes to first

0 position in which it gives voltage to its first output. This voltage is applied to the first and second electric motors 2, 3 and to the electrical inputs of the first and second electromagnetic couplings 4, 5. After operation, the electromagnetic couplings kinematically couple the axes of the electric motors 2,3 and the drums 6,7, respectively. The rotation of the rotors of the electric motors causes the rotation of the drums. When rotating the first and

0 of the second reels 6, 7, the cable 1t) is wound on the first one, and on the second cable 11. This leads to the raising of the first probe 8 and lowering of the second probe 9. At the same time, the first load 14 is lowered and raised

5 second load 15. After bringing the probes back to their initial state for the next cycle of measuring the density of the dressing, the measuring part of the device is prepared.

After a specified period of time, the software relay 1 switches to the second

the position in which the voltage is removed from the first output of this relay, but not yet supplied to the second. The de-energized electric motors stop the rotation of their rotors, and the electromagnetic couplings break the kinematic connections between the electric motors and the drums. The first probe 8 has a density of material known to exceed the density of the liquid. Therefore, it begins to immerse into the liquid at an increasing speed, which quickly approaches the speed of uniform movement of the immersion. The density of the material of the second probe 9 (taking into account the influence of the counterweight 15) is lower than the density of the controlled liquids. Therefore, the second probe 9 floats with increasing speed, which quickly approaches the speed of uniform movement of the ascent:

After a period of time sufficient to ensure that the ascent and dive speeds practically do not differ from the speeds of the uniform movement of the dive and ascent, the program relay 1 moves to the third position, in which there is a strictly specified period of time. In this mode, the voltage appears at the second output of the software relay 1, which includes the first turn angle meter 16, the second turn angle marker 17 and after a specified time delay the computing unit 39. The turn angle indicators 16, 17 output single pulses after each rotation of the corresponding drum 6, 7 at a given angle. Drum rotation. is caused by the motion of the probes, and the number of pulses at the outputs of the angle markers with the required discreteness characterizes the distances traveled by each of the probes. The pulses of the s-outputs of the angle indicators 16, 17 are fed to the inputs of the second and third formers 27, 28, respectively, from which the counting inputs of the first and second counters 3,1,32, which are summed, respectively, follow.

After the program relay 1 moves to the fourth position, the voltages are removed from both outputs. The angle gauges 16, 17 are turned off. In the first counter 31 and the second counter 32, the accumulated pulse sum codes are recorded. Given the time spent by the software relay 1 in the third position, these sums make it possible to calculate the speed of uniform movement of the first and second probes 8, 9.

The voltage from the single output of the trigger 20 is also applied to the fourth driver 29 and the first input of the second element And 30. The fourth driver 29 on the basis of the voltage drop at its own input generates a single pulse, which zeroed the third counter 33. The second element And opening on the first input And 30 begins to transmit to the counting input of the third counter 33 the pulses of the base length sensor 24. The input of this sensor is connected to a measuring roll 23 rotated by the work base. Pulses at its output appear at each new rotation of the measuring roll 23 by a given angle. Therefore, the number of pulses at the output of the sensor is proportional to the length of the processed base, and the code of the third counter 33 characterizes the length of the processed base for the time during which the second element And

 zo. ; ; .. -.-;

This period of time (its beginning corresponds to the moment of separation of the dressing - from the upper level sensor 19) ends at the moment of separation of the dressing from the lower level sensor 18.,

Thus, at the time when the dressing of the lower level transmitter 19 will come off, the first counter 31 and the second; counter 32 will store the data necessary for calculating the current density value of the dressing in the adhesive box, and in the third counter 33 there will be data necessary for calculating the linear weight of the dressing material on the basis of. If it is necessary to calculate the true glue, it is necessary through the first information input unit 34 and the second information input unit 35 to enter into the second register 37 and the third register 38 data on the linear weight (tex) of the base material and its stretching. If technical means are available that automatically measure the last two parameters, their outputs must be connected to the first and second groups of meter inputs.

When the dressing is separated from the sensor 18 of the lower level, its output appears. the decisive potential transmitted to the zeroing input of the trigger 20, by which this trigger is brought to the zero state. By the appearing inhibitory potential at the single output of the trigger 20, the second element And 30 is locked at the first input of the trigger, and the first element And 21 is opened at the first input of the trigger at the zero output of the trigger 21. The state of the third counter 33 is fixed. When the voltage appears inlet meter from-. closes valve 22 in the dressing supply line. The size of the dressing in the adhesive box rises to a predetermined level.

After a period of time sufficient to record the required information in the counters 31, 32, 33 and registers 37, 38, a delay pulse appears at the output of the delay element 25, which is transmitted to the control input of the computing unit 39 and resets the input of the first register 36. The contents of the register are reset to zero, and the computing unit 39 is included in the work on the account according to the internal program. It rewrites the contents of the counters 31, 32, 33 and registers 37, 38 into its own memory and calculates the density of the dressing, as well as the linear weight of the sizing its material based. The code of the calculated value is written into the first register 36, the output potentials of which are controlled by the digital-to-analog converter 40. This converter generates an analog voltage proportional to the value of the code of the first register 36. This voltage is output to the meter and supplied to the indicator 41, which is highlighted measured value of weight; sizing material based on,

An intermediate calculation of the density of the dressing in the adhesive box of the sizing machine is carried out according to the formula:

. Rpr1 V2 + Rpr2 V1

/ Exp rz - - / -;: --- ---., R3g (Vi + v2)

.- - -. ABOUT - . - -

where R is the radius of the probes;

pz is the density of probe materials;

fa — measured liquid density;

g is the acceleration of gravity;

Pnpi - weight of the first cargo 14;

Rpr2 - the weight of the second cargo 15; : yi is the uniform immersion speed of the first probe 8;

V2. - uniform ascent rate / second probe 9.

This expression will be simplified if 2Ppr1 Ppr2 is selected. Taking into account that the measurement time is fixed, and the movement is uniform, in the calculations you can use the ratio:

Rz rz

3 RPR1 Li + 2 L.2

Li. + L2

4rcR3g

where Li is the path traveled during the measurement by the first probe 8;

1.2 is the path traversed by the measurement burden of the second probe 9.

The linear weight of the material based on is calculated by the formula:

pp

 rschm Q

AV AT

where AR is the linear weight of the sizing material based on; -. .. CWM density of absolutely dry (dried to constant weight) sizing material; . --.... . ..

 / Er is the density of the solvent liquid, in which water is most often used ;; . ..... .. ..;.

AV is the volume of the dressing carried out from the adhesive box of the sizing machine during the measurement; .

A L is the length of the base sacked during the measurement.

,

twenty

Claims (1)

The claims 0 5 0 5 Liquid density meter containing a software relay, first and second probes, drums, angle indicators, electric motors, loads and electromagnetic couplings, first, second and third formers, first and second counters, delay element, first register, computational unit, digital-to-analog - the first converter and indicator, and the electrical inputs of the first and second electric motors and the first and second electromagnetic couplings are connected to the first output of the software relay, and their outputs are grounded, the inputs and outputs of the first and second turn angle indicators are connected to the second output of the program relay: and the inputs of the second and third formers, respectively, the input and output axes of the first and second electromagnetic couplings are kinematically connected with the axes of the first and second electric motors and the first and second drums, respectively, the first and second probes and the first and second loads using the first and second main cables and the first and second additional cables are fixed on the first and second reels, respectively, the input of the first shaper is connected to T the other output of the software relay, and its output is connected to 0 nullified the first and second counting inputs. Chikov directly and through the delay element - to the zeroing input of the first register and the input of the computing unit, the counting inputs and outputs of the first and second counters are connected to the outputs of the second and third shapers and the first and second groups of inputs of the computing unit, respectively, the troupe of inputs and outputs of the first register are connected with exits 5 the computational unit and the inputs of the digital-to-analog converter, respectively, the indicator input is connected to the outputs of the digital-analog converter and meter, t, and the frequency and the fact that, in order to expand functionality by measuring the linear weight in the study of dressing based on materials, it additionally contains a sensor for the length of the base, a valve with a controlled input, a fourth driver, a trigger, the first and second elements And, the third counter, the second and third registers, the first and second information input blocks sensors and sensors of the upper and lower levels, the outputs of which are connected to the unit and zero inputs of the trigger, respectively, the first input of the first element And is connected to the unit output of the trigger, the second input of the first element And is connected to the controlled input of the meter, the output of the first element And is connected to the controlled valve input, the trigger zero output is connected to the input of the software relay, the input of the fourth driver and the first input the second element I. the second input of which is connected to the output of the base length sensor, zeroing and counting inputs and outputs of the third counter are connected to the outputs of the fourth driver, the second element And and the third group of inputs of the computing unit, respectively, the outputs of the first information input unit are connected to the first group of inputs the meter and the inputs of the second register, the outputs of which are connected to the fourth group of inputs of the computing unit, and the outputs of the second information input unit are connected to the second group of inputs of the meter and third register inputs, the outputs of which are connected to the inputs of the fifth group of the computing unit. FIG I