SU1603239A1 - Device for determining physico-chemical parameters of liquid - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure the viscosity and density of a controlled fluid. The aim of the invention is to improve the measurement accuracy. Measurements are made while probes are moving with varying velocities and braking the probes when their velocities have reached the specified values, and fluid parameters are calculated from uniform velocities of the steady-state probes movement predicted by statistical processing of the results of measuring the passage times of probes of the determined points of their movement. in accordance with the developed model of the change in speed when moving in a transient mode. 1 il.

Description

The invention relates to a measurement technique and can be used to measure the viscosity and density of a controlled fluid.

The aim of the invention is to improve measurement accuracy.

The drawing shows the structure of the proposed device.

The device contains a ball 1, which is a probe that perceives the buoyancy force and the resistance force of the viscous liquid under study, a counterweight 2, which reduces the speed of the ball 1, the block 3, through which the cable 4 is thrown, on which the ball 1 is attached and the counterweight 2, additional weight 5, providing the ascent of the ball 1, the motion time recorder 6, measuring the transit times of the balls 1 of predetermined distances, and issuing an encoded signal

code tags in a single pulse on its own group of outputs and output when detecting the passage of the next label. In addition, the device contains a power relay 7. attracting a spring-loaded lever 8 in the on state, a spring-loaded lever 8 lifting the additional load 5 for the duration of the ball

I, vertical guides 9 along which the additional load 5 moves, switches 10, which limit the trajectory of the ball 1, controlling the relay

II, together with switches 10 controlling the reciprocating movement of the ball 1, time relay 12, providing the required time delay when applying voltage to the power relay 7, generator 13, issuing stable frequency rectangular pulses, counter 14, summing

counting input pulses, trigger 15, controlling the operation of output elements, element 16 ederzhki, delaying the reset of the counter 14 for the response time of the output elements, element I 17, which transmits a single pulse when it is necessary to stop the ball 1, one-oscillator 18, setting the operation time of the electromagnetic brake 19, an electromagnetic brake 19, the ball 1 that stops when triggered, s}) 0rmirovat 20, issuing a single pulse of a given shape when a pulse arrives at its own input.

The elements of the device interact with each other as follows. Through the block 3, a cable 4 is thrown at the ends of which the ball 1 and the counterweight 2 are fixed. The marks applied to the block 3 after a predetermined distance (for example magnetic) affect the sensitive element of the movement time recorder 6, the output group and the output are connected to the output group and output device, respectively. In addition, the output of the movement time recorder 6 is connected to the input of the imaging unit 20, the output of which is connected to the first input of the AND element 17 and the input of the delay element 16. The output of the delay element 16 is connected to the counter-zero input of the counter 14 and the setup input of the trigger 15. The counter input of the counter 4 is connected to the output of the generator 13, and its output is connected to the oblique input of the trigger 15, the output of which is connected to the second input of the element иб 17. 18 is connected to the output of the element 17, and its output is connected to an electromagnetic brake 19, which, when triggered, brakes unit 3. The additional load 5 reciprocates in vertical guides 9, and downward under the action its own weight, and up - under the action of a kinematically connected spring-loaded lever 8 made of magnetic material. Spring-loaded 8 moves in one direction under the influence of its own spring, and in the opposite direction under the influence of the magnetic field of the actuated relay 7. The switches 10 are installed at the end points of the movement path of the additional load 5, and their contacts are included in the power supply circuit of the control relay 11, time relay 12 and power relay 7.

Through the contacts of the upper (first) switch 10, the supply voltage is supplied to the inputs of all other contacts, through which it is fed to the windings of all relays. A voltage is applied to the winding of the control relay 11 through the contact of the second (lower) switch 10. Time relay winding 12 is energized through the contact of the control relay 11 and through its own self-blocking contact. The voltage across the winding of the power relay 7 is supplied through the relay contact 12 of time.

The device works as follows.

The measurement is carried out in the process of reciprocating movement of the ball 1 in the liquid, the parameters of which are measured. The immersion of the ball 1 occurs under the action of its own weight at the time when, when the power relay 7 is activated, under the influence of a spring-loaded lever B, the additional weight 5 is removed from the counterweight 2 and lifted to the upper position. The immersion speed of the ball 1 is reduced by the counterweight 2. When the ball reaches the low point of the trajectory, which is determined by the moment when the counterweight 2 touches the additional weight 5. In this state it remains until the relay 12 is turned off. After that, the voltage is removed from the power relay 7, the spring-loaded lever 8 is lowered and the additional load 5 loads the counterweight 2. Since the total weight of the counterweight 2 and the additional load 5 is greater than the immersion force acting on the ball 1, it begins to float to the point of the trajectory in which the lowering counterweight 2 acts on the second lower switch 10. When this switch is triggered, the voltage is applied to the control relay 11. Through the closing contacts of this relay, the voltage is applied to the time relay 12 blocking its own voltage supply circuit, and through its contact voltage is applied to the power relay 7. Under the influence of the power relay 7, the spring-loaded lever 8 again lifts the additional load 5, removes it from the counterweight 2. The new immersion cycle of the ball 1 begins and its subsequent ascent.

In the course of the movement of the ball 1, under the influence of the cable 4, the block 3 rotates. With the passage of each label, a pulsed coded signal appears, which characterizes the label address, on the output group and the output pulse of the movement time recorder 6. They are transmitted to a group of outputs and a device output. In addition, the pulse from the output of the recorder 6 of the time of movement is fed to the input of the imaging unit 20, which leads it to the required form, From the output

shaper 20 this pulse is transmitted to the input of delay element 16 and the first input of element 17. At the second input of this element, a control voltage is supplied from the output of trigger 15. If the time interval between two pulses at the output of shaper 20 exceeds a certain set value, i.e. . if the ball 1 moves at an admissible low speed, then the trigger 15 is in the zeroed state - the scientific research institute and at its output the inhibitory potential. The pulse through the element And 17 from the first entrance to the exit does not pass. If the speed of the ball 1 exceeds the allowable value, i.e. if the time interval between two passes of the magnetic marks past the sensitive element of the motion recorder 6 is inadmissibly small, then the trigger 15 is in a single state. At its output, the resolving potential and the pulse of the first input of the element And 17 passes to the output of the element and then goes to the one-shot 18, putting it into an unstable state. A single voltage pulse appears at the output of the single-vibrator 18, which activates the electromagnetic brake 19. Under its influence, the unit 3 stops rotating, and consequently, the ball 1 and other moving parts of the device stop. As soon as the pulse at the output of the one-shot 18 is over, the electromagnetic brake 19 will release the block 3, and the ball 1 will move again with a gradually increasing speed in the reciprocating cycle:

To control the operation of the trigger 15. a pulse from the output of the delay element 16 is fed to its installation input, transferring the trigger 15 to the unit state, and to the zeroing input of the counter 14, flushing its contents to zero. Pulses from the output of generator 13 are fed to the counting input of counter 14. If the time interval between the pulses at the output of the driver 20 exceeds a predetermined constant, the counting impulses a pulse at the output of the counter 14 that the trigger 15 zeroes at and its output barring potential. If this time interval is less than the specified one, then in the process of summation the pulse at the output of the counter 14 does not have time to turn out. The trigger 15 continues to be in a single state, and the permitting potential remains at its output.

Pulse signals from the group of outputs and output of the device arrive at the inputs of the computing unit (microcomputer), which the device operates jointly. The computational unit, according to a predetermined program, calculates the predicted uniform immersion speed and the ascent of ball 1, and then calculates the measured viscosities and density of the controlled fluid.

Claims (1)

Invention Formula A device for determining the physicochemical parameters of a fluid, such as viscosity and density, containing a sensitive element in the form of a ball, a recorder of time of movement and a device for reciprocating movement of a ball in the vertical direction in a container for the test liquid, and the device for reciprocating movement is performed in the form of a block with a cable thrown over it, on one end of which a ball is fixed, and on the other - a counterweight, and an additional load with an axial bore em d / n trose, wherein the apparatus further comprises a relay associated to one end of a spring-loaded lever material having magnetic properties, the second end of which is kinematically coupled. with an additional load mounted for movement in vertical guides, switches mounted at the extreme points of the ball's trajectory and connected to the contacts of the control relay, whose input is connected via a time relay to the input of the power relay, because In order to improve the measurement accuracy, a generator, a counter, a trigger, a delay element, an And element, and a one-shot are entered into it. electromagnetic brake and. a driver, the input of which is connected to the output of the motion time recorder, and the output is connected to the input of the delay element and the first input of the element I, the counter insulating input is connected to the output of the delay element and the trigger input, and its counting input and output are connected to the generator output and to the tilting trigger input, respectively, the second input of the And element and the inputs of the one-shot and electromagnetic brake are connected to the outputs of the trigger, the element And and the one-shot, respectively. 20 / ten f / e e „