SU1395392A1 - Method of sorting ore lumps - Google Patents

Abstract

The invention relates to the mining industry and can be used in the sorting of lumpy mineral raw materials. The purpose of the invention is to improve the accuracy of sorting. A stream of ore pieces is individually fed into the optical chamber of the separator. With the passage of the measurement zone, pieces of ore interrupt the optical connection between the emitters and photodetectors. In the case of a piece displaced relative to the axial line of motion, a pulse of the corresponding polarity is formed at the output of the adder. If the piece moves along the center line, then a logical zero is present at the output of the adder. At the same time, a signal is generated at the integrator output, the amplitude of which is proportional to the projected area of the piece. The received signals are summed with the reference voltage in another adder. The voltage at its output is a discrimination level and determines the operation of the comparator. With the passage of the photometric control zone, the piece is refreshed with a light source, and the reflected light is captured by the photo detector. The signal received at its output through the amplifier is fed to the input of the comparator. If this signal exceeds the established level of discrimination, then at the output of the comparator a command signal is generated to the actuator, which removes pieces from the flow. 1 il. (L

Description

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The invention relates to the mining industry and can be used in the sorting of lumpy mineral raw materials.

The purpose of the invention is to improve the accuracy of sorting.

The drawing shows a block diagram of a device that implements the proposed method.

A device that implements the method of sorting ore lumps contains a source of scattered light 1, a photo detector 2, Leeka emitters 3, photo-detectors 4 and 5 to control the deflection of pieces L of the axial line of motion, which are set symmetrically relative to the axial line. and photodetectors 6 for measuring the projected area of the pieces, photocurrent amplifiers 7 ... 10, inverter 11, integrator 12 for Determining a signal proportional to Rloch, ad projection of the analyzed piece P1 source 13 reference voltage, sum- input ignalov, delay line 17, a comparator 18.

The method of sorting ore chunks is carried out as follows.

A stream of ore pieces is individually fed into the optical chamber of the separator. Chunks of ore pass first through the measurement zone, where their project area and the deviation from the center line are determined, and then through the photometric control zone, where the optical properties of the surface of each piece of ore are determined. When passing through the measurement zone, pieces of ore interrupt the optical communication between the emitter lines 3 and the photodetector lines 4 ... 6. In the event that a piece is displaced in one direction or another from the photodetector 2 relative to the axial line of motion, voltage outputs of different levels appear at the output of amplifiers 7 and 8, since in each photoline 4 and 5 there is a different number of illuminated photodetectors. The voltage from the output of the amplifier 8 is inverted by the inverter 11 and fed to the input of the adder 14. At its other input, a voltage pulse is received from the amplifier 7. The input pulses of the adder 14 are summed with their signs, and at its output

Signal: in the case of a piece being removed from the photo detector - negative, and in the case of approximation - positive. If the piece moves along the center line, then the output of the adder 14 is a logical zero. Simultaneously with the control of the deviation of the ore piece from the centerline, the area of its projection is measured. A pulse appears at the output of amplifier 9, the amplitude and duration of which are proportional to the linear dimensions of the piece being analyzed. This signal is fed to the input of the integrator 12. The signals from the outputs of the adder 14 and the integrator 12 are summed by the adder 15, and the received signal is summed with the reference voltage in the adder 16. The voltage at its output is the discrimination level and determines the operation of the comparator 18. Line delay 17 delays the signal from the output of the adder 16 for the time of movement of the piece from the zone

0 measurements to the photometric control zone, where the piece is illuminated by the light source 1, and the reflected light is detected by the photo detector 2. The signal received at its output goes through the amplifier 10 to the input

5 of the comparator 18. If this signal exceeds the established discrimination level, then at the output of the comparator 18, a command signal is generated to the actuator, which removes pieces from the stream.

0

Claims (1)

Invention Formula The method of sorting ore chunks, which consists in feedstock starting material feedstock, measuring the luminous flux reflected from the sorted piece of ore and the projected area of this piece, followed by dividing the lumps, characterized in that simultaneously with the measurement of the magnitude of the deviation of the path of the piece from the axial line of motion, and f is determined from the sum of the results of the measurements obtained. threshold level of discrimination for each piece of ore. five b, v, one t