SU606952A1 - Device for measuring dredger pulp solid phase velocity - Google Patents

Description

Comparison and matching elements and two differentiation elements, the inputs and outputs of the first and second differentiation elements are connected, respectively, with the inputs of the memory elements and the comparison elements, the other elements of the comparison elements are connected to the outputs of the memory elements, and the outputs a coincidence element, the output of which is connected to the inputs of the time counter and the control unit, the output connected to the control inputs of the memory elements and the second input of the time counter.

The drawing shows the functional diagram of the proposed device for measuring the speed of movement of the solid phase of the pulp of the dredger.

The device contains two instantaneous consistometers I, and 2, the sensors 3 and 4 of which are located at a fixed distance t from each other along the slurry line. The outputs of the consistometers are connected to the inputs of the computing unit 5, which includes the elements: memories 6 and 7; comparisons 8 and 9; differentiations 10 and 11; coincidence 12, as well as a time counter 13 and a control unit 14.

The device works as follows.

Using consistometers 1 and 2, the current consistency of the pulp consistency is measured in the corresponding sections A and B of the slurry line. The signals from the outputs of consistometers are fed to block 5, which determines the time spent by the local volume of the solid phase of the pulp on the passage of the AB section of a known length E. Then the speed of the solid phase of the pulp for a single measurement cycle is determined as follows;

VT - (M / S).

The indicated time is determined using block 5 as follows.

Memory elements 6 and 7 and Comparison 8 and 9 ensure that the measurement base at the beginning A and the subsequent detection at its end B of the characteristic features of this microvolume are solid: the values of its consistency and its derivative, determined with the help of differentiation elements 10 and 11. The "tagged microvolume" is fixed by the coincidence of both signs using the matching element 12, which generates a command to stop the time counter 13, which was started at the time the command was sent from the control unit 14 to the memory elements 6 and 7 for applying "marks on the microvolume. Simultaneously with the stopping of the time counter 13, the coincidence element 12 is supplied with a signal to the control unit 14 to start the next measurement cycle. The measurement cycle time automatically varies as a function of the velocity of the solid phase of the pulp.

which provides the constancy with respect to the quantization scale with respect to speed, and hence the measurement error. In the case of non-detection of the "labeled volume, possible due to the natural distortion of the signal" marks through time

t AB

L max and

According to the command from the control unit 14, the initial information about it is erased from the memory elements 6 and 7 and the next measurement cycle begins. In this case, the output value of the device remembers the previously determined velocity value. Depending on the speed of movement of the solid phase of the pulp, the device takes about 10-30 measurements per second, which ensures high reliability of the information.

The proposed device for measuring the rate of movement of the solid phase of the pulp replacement allows the measurement of the speed of movement of the solid with high accuracy.

phases in a non-stationary two-phase flow with simpler hardware implementation and high measurement reliability.

Claims (2)

1. Kazansky L.V. Automatization of Suction Dumps, M., Stroyizdat, 1968, with. 42-44. 2. Kozubovsky, S. F., Correlation extremal systems. Kiev, “Naukova Dumka, 1973, p. 164-168. j