SU785755A1 - Apparatus for monitoring dimensions of useful-component impregnation in slurry flow - Google Patents

Description

(54) DEVICE TO CONTROL DIMENSIONAL SIZES OF USE COMPONENT IN PULP FLOW

I

The invention relates to devices for non-destructive testing by ultrasonic methods and can be used to automatically control the quality of processed ore and control the process of enrichment of ores.

A device for monitoring the dissemination of a useful component is known, which includes a slide projector and a mechanical counter for the sizes of 1D blotches.

The disadvantage of it is low control performance; since the device is implemented. .. a visual study of the photonegative 15 of the sample section.

The closest to the technical essence of the invention is a device for controlling the size of the disseminations of the useful component in the pulp stream, containing the first and second electro-acoustic channels, each of which consists of a series-connected ultrasonic oscillator that amplifies and receiving transducers, and a computing unit, the inputs of which are connected to the receivers of both channels G21 .30

The disadvantage of this device is the low accuracy of measurements of the size of inclusions due to the lack of reference data on the size of the controlled class of solid in the pulp flow.

The purpose of the invention is to improve the accuracy of measuring the size of the inclusions of the useful component in the pulp.

The goal is achieved by the fact that the device is equipped with a series-connected control unit and an oscillating circuit, the output of which is connected to a generator of ultrasonic vibrations of the second electro-acoustic channel, an extremizer whose input is connected to the output of the computing unit and the measuring unit connected between the output of the accelerator and the second output of the oscillating circuit.

The drawing shows a block diagram of the proposed device.

Claims (2)

The device for monitoring the size of the inclusions of the useful component in the pulp stream contains the first electro-acoustic channel 1, which consists of a series-connected ultrasonic oscillation generator 2, a power amplifier, emitting and receiving transducers (not shown), receiver 3; the second electro-acoustic channel 4, which consists of a series-connected oscillator 5 of ultrasonic vibrations, a power amplifier, an emitter and a receiving transducer (not shown) and receiver 6; a computing unit whose inputs are connected to receivers 3 and 6 of both channels j are sequentially connected to a control unit 8 and an oscillating circuit 9, the output of which is connected to the ultrasonic oscillator 5 of the second electroacoustic kangsha 4} extruder 10, whose input is connected to the output of the computing unit 7, and a measuring unit 11 connected between the output of the extremator 10 and the second output of the oscillating circuit. The device works as follows. The generators 2 and 5 of both channels form low and high frequency ultrasonic vibrations in the channels, respectively. These oscillations pass through channels 1 and 4, are attenuated by the flow of pulp, and through receivers 3 and 6 are fed to the computing unit 7. The output signals of the receivers have different levels due to the frequency dependence of the attenuation in the pulp. Computing unit 7 calculates the ratio of these signals, differentiates it and calculates the current deviation of this ratio from the average value, then averages the results and generates the output signal in accordance with the expressions: where is the current deviation of the ratio of output signals of channels 1 and 4 from the mean; X is the average value of the modulus of the derivative of the ratio of these signals and the characteristic of the dynamic properties of the solid in the pulp. The value of 9 is variable and reaches a maximum in the case when the wavelength of ultrasonic vibrations passing through the pulp is equal to the average size of the inclusions of the useful component. The signal of the control unit 8 performs the restructuring of the oscillatory circuit 9, smoothly changing the frequency of the ultrasonic vibrations in the second channel 4. At the same time, the output signal of the computational unit 7 smoothly changes. When the melsh equals the average size of the inclusions of the useful component and the wavelength of the ultrasonic oscillations, the signal becomes maximum. Extremer 10 captures this moment and issues a measurement resolution command to block 11. Unit 11 measures the frequency of the ultrasound, scales it and gives the value of the average size of the inclusions. The speed and time of dimensional control is varied by block 8, depending on the requirements of the ore concentration process. The application of the invention allows to quickly and accurately control the average size of the inclusions, to optimize the mode of operation of equipment providing enrichment of ores. Apparatus of the Invention A device for controlling the size of inclusions of a useful component in a pulp stream, comprising first and second electro-acoustic channels, each of which consists of a series-connected ultrasonic oscillator, a power amplifier, an emitting and receiving transducer, and a receiver, a computing unit whose inputs are connected to receivers of both channels, characterized in that, in order to improve the accuracy of measurements of the size of the inclusions of the useful component in the pulp, it is equipped with directly connected to the control unit and the oscillatory circuit, the output of which is connected to the ultrasonic oscillation generator of the second electro-acoustic channel, an extremator whose input is connected to the output of the computing unit, and a measuring unit connected between the extremizer output and the second output of the oscillating circuit. Sources of information taken into account in the examination of 1, S.I. Mitrofanov and L.A. Barsky. The study of minerals for enrichment. M., with. . 2. USSR author's certificate according to the application 2587812 / 18-10, cl. G 01 N 29/00, 07.27.78 (prototype