SU1121620A1 - Method of measuring speed of filling mixture motion along the pipe-line - Google Patents

Abstract

METHOD OF MEASURING THE SPEED OF MOTION OF A MORTGAGE MIXTURE UNDER THE PIPE // / 7 / / I / / 7y7Ji /, ...... h; ; j, .. Lx- -OC ... ; -; - b -: T V.; .V: gr i: r / -. . .;: r f:; ttt-loo:,, x. ..- gXV% - JL - I l. . 7, - t,. ... . ::. h / 7. -I ... -. The ///// /////// WIRE, which consists in measuring the voltage on the measuring electrodes with different normal potentials, characterized in that, in order to measure the accuracy of the measurement, the activation is carried out the pipeline is electro-hydraulic discharge, the time between the electro-hydraulic discharge and the maximum voltage across the measuring electrodes is measured, and the speed of the filling mixture is determined as a result of dividing the distance between the discharge and measuring electrodes by and measured time .. - - y ---;

Description

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The invention relates to a method for measuring the speed of movement of a backfill mixture and can be used in mining in the development of mineral deposits with a hardening bookmark of the space developed.

An acoustic method is known for measuring the velocity of a mixture, which consists in transmitting and receiving - acoustic signals I j.

However, this method has insufficient accuracy, since the instrument’s readings are influenced by the variation in the moisture of the mixture and the change in the fractional composition of the filling mixture’s filler, which leads to a change in the rate of ultrasound propagation, which, when determining the velocity of the mixture, is considered constant

The closest to the proposed technical entity is a method of measuring the speed of movement of the filling mixture through a pipeline, which consists in measuring the voltage on measuring electrodes made of metals with different values of normal potentials, and determining the speed of movement of the mixture depending on the voltage on the measuring electrodes 2J.

However, the known method also has insufficient accuracy, since the voltage of the galvanic cell depends on a number of factors - the dispersion of cement of its brand, temperature and water metering, which reduces the measurement accuracy. These reasons lead to either scaled values of the speed of movement of the filling mixture, or to underestimated.

The purpose of the invention is to improve the accuracy of measuring the speed of movement of the filling mixture.

This goal is achieved by the fact that, according to the method of measuring the speed of the filling mixture through a pipeline, which involves measuring voltage on measuring electrodes with different normal potentials, the time of the pipeline in the filling mixture is activated by electro-hydraulic discharge. the occurrence of the maximum voltage on the measuring electrodes, and the speed of movement of the filling mixture determine

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as a result of the division of the distance between the discharge and the measuring electrodes by the measured time.

A high-voltage electrical discharge is produced in the filling solution. The pressure pulses resulting from the discharge in the filling solution propagate in a continuous front in a spherical cavity. Electro-hydraulic shock is a complex of oscillations, covering a wide spectrum range from infrasonic to ultrasonic frequencies. Component amplitudes

5 electrohydraulic impacts are sufficiently large for intensive grinding of particles into a binder, which increases their specific surface, i.e. increases activity in the gutter.

0 The stowing mixture is an aqueous electrolyte solution, i.e. substances that break down into ions. The main source of ions in the filling mixture is the

5 above all cement. The filling mixture solution together with electrodes made of metals with different electrode potentials forms a galvanic cell. In the considered

0, the way these electrodes serve as measuring.

Physically, the increased water retention capacity of the cement gel is characterized by a new energy state due to an increase in the dispersion of particles, the number of mutual contacts between cement particles and a decrease in the intergranular cross sections (pores) filled with water.

As a result of increased dispersion

and the internal redistribution of the liquid phase in the cement gel increases the adsorption capacity of the cement. the density of the liquid phase on the surface of the solid particles. Additional energy is released, which; trying to reduce its excess potential, contributes to a greater convergence of the particles of the solid phase Hj as a result of this, causes the appearance of an additional contraction of the cement gel.

Thus, the passage of an activated by electrohydraulic discharge core in the area of the measuring electrodes leads to an increase in voltage on these electrodes; 3 measure the time between the electrohydraulic discharge and the occurrence of the maximum voltage on the measuring electrodes, we find the speed of the filling, changing by the formula where 5 is the fixed distance between the discharge and measuring electrodes; Db - the time between the electrohydraulic discharge and the occurrence of the maximum voltage on the measuring electrodes. FIG. 1 shows the electrodes a block diagram of measuring the speed of movement of the filling mixture; in fig. 2 is a graph of the moment of discharge and the time of arrival of the pulse to the measuring electrodes. The method is carried out by the following device. In pipeline 1 (Fig. 1), along which the filling mixture 2 moves, the discharge electrode 3 is flush with the pipeline. The pipeline itself serves as the second electrode. The discharge electrode is separated by an insulator 204 rum 4. At some distance from the discharge electrodes, the measuring electrodes 5 and 6 (duralumin stainless steel) are flush with the pipeline, separated by an insulator. Using a high-voltage source 7, an electro-hydraulic discharge is produced in the filling mixture through the discharge gap 8. measuring electrodes produces a signal that enters the algebraic unit 10, i.e. The algebraic block receives information about the moment of discharge and the time tn of the pulse arriving at the measuring electrodes at a fixed distance between the discharge and the measuring electrodes. The spent signal, proportional to the speed of movement of the filling mixture, is fed to the recorder 12. The use of the proposed method will prevent blockage of the filling pipeline, reduce loss of bookmarks and downtime of the filling complex.

Claims (1)

I METHOD FOR MEASURING THE SPEED OF MOTION OF MORTGAGE MIXTURE ON PIPE-. WIRE, which consists in measuring the voltage on the measuring electrodes with different normal potentials, characterized in that, in order to increase the accuracy of the measurement, the binder in the filling mixture is activated by electro-hydraulic discharge, the time between the electro-hydraulic discharge and the appearance of the maximum voltage on the measuring electrodes are measured, and the speed of movement of the filling mixture is determined as the result of dividing the distance between the discharge and measuring electrodes by the measured time.