SU1395366A1 - Apparatus for monitoring the size of crushed ore - Google Patents

Abstract

The invention relates to the field of automation of crushing and grinding equipment, can be used to control the size of crushed ore in ferrous and nonferrous metallurgy and allows to increase the accuracy of control. The device contains an ultrasonic frequency voltage generator I, emitter 2, receiver-converter 3, resonant amplifier 4, amplitude detector 5, Schmitt trigger 6, logic elements 7 and 8, counters 9 and 10, switches I 1 and 12, block 13 dividing , timer 14, inverter 15, differentiator 16, smoothing filter 17, setting factors 18, 19, and 20 coefficients, adder 21, multiplication unit 22, and registering device 23. 1 Il. "(L

Description

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The invention relates to the field of automation of crushing and grinding equipment and can be used to control the size of crushed ore in ferrous and nonferrous metallurgy.

The aim of the invention is to improve the accuracy of the control.

The drawing shows the block diagram of the device control the size of crushed ore.

The device contains an ultrasonic frequency voltage generator 1, an emitter 2, a receiver-converter 3, a resonant amplifier 4, an amplitude detector 5, a Schmitt trigger 6, logic gates And 7 and 8, counters 9 and 10, switches 11 and 12, block 13 dividing, a timer 14, an inverter 15, a differentiator 16, a smoothing filter 17, a factor setter 1 and 19 (coupling), a factor setter 20 (taking into account the degree of overlap), an adder 21, a multiplication unit 22, a registering device 23.

The output of the ultrasonic frequency voltage generator 1 is connected to the input of the radiator 2 and to the first input of the element 7. The output of the receiver-converter 3 of the ultrasonic oscillations into an electrical signal is through a resonant amplifier 4, an amplitude detector 5 and a Schmitt trigger 6 connected to the second input of the logic element 7 , with the input of the smoothing filter 17 and the counting input of the pulse counter 10. The output of the logic element And 7 is connected to the counting input of the pulse counter

9. The outputs 9 and 10 of the counters through the switches 11 and 12 are connected to the corresponding inputs of the dividing unit 13. The first input of the adder 21 is connected to the output of the division block 13. The second input of the adder 21 is connected to the output of the setpoint 18 of the coupling coefficient. The third input of the adder 21 is connected to the output of the setting unit 20 of the factor of accounting for the degree of overlap. The output of the adder 21 is connected to the first input of the multiplier 22. The second input of the multiplication unit 22 is connected to the output of the setting device 19 of the second coupling coefficient, and its output is connected to the input of the registering device 23. The output of the smoothing filter 17 is connected by t input of the setting unit 20 of the degree of overlap factor. The output of timer 14 is connected to the second input of the logic element 8 and the input of the inverter 15. The output of the inverter 15 is connected to the input of the differentiator 16, the output of which is connected to the control inputs of counters 9 and 10. The first and third inputs of the logic element 8 are connected respectively to the outputs of the counters 9 and

10, and the output of the AND gate 8 is connected to the control inputs of the AND switches and 12.

The device works as follows.

The alternating voltage of the oscillator 1, applied to the emitter 2, is converted into a narrow beam of ultrasonic vibrations. The emitter 2 and the receiver 3 are fixed on the reloading device so that the beam is blocked by falling pieces of material. With the passage of 5 through the measurement zone, individual pieces and groups of pieces of material block the beam, which modulates in amplitude the signal of the receiver with 3 trapezoidal pulses. After amplifier 4 and detector 5, the carrier component is excluded from the signal, and

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the modulating component after the Schmitt trigger 6 is converted into a rectangular pulse, the duration of which is formed by the size of the pieces and their speed. The Schmitt trigger signal 6 is fed to

5, a pulse counter 10, where it is converted to a voltage corresponding to the number of pieces overlapping the beam. The Schmitt trigger signal 6, after it is filled with square pulses from generator 1 in logic element 7, is fed to counter 9, where it is converted into a voltage corresponding to the total time of the blocked beam. The signals of counters 9 and 10, the switches 11 and 12, and the division block 13, are converted into a voltage proportional to the average size of the monitored material. The timer 14, the logic element AND 8, the inverter 15 and the differentiator 16 control the counters 9 and 10 and the switches 11 and 12, ensuring the frequency of control of the material.

Q The Schmitt trigger signal, through the smoothing filter 17, corresponds to the relative sensor beam overlap time. The signal of the smoothing filter 17 is transmitted to the input of the setpoint 20 control of the degree of overlap, output from

5 of which the signal arrives at the third input of the adder, this signal corresponds to the correction value of the instrument readings, depending on the flow rate. The first and second inputs of the adder 21 receive signals from the dividing unit 13 and the generator 18 of the first coupling coefficient. The signal at the output of the adder 21 corresponds in a certain scale to the average particle size, in order to bring it to the values necessary for recording

The registering device 23 is the multiplication unit 22 and the setting unit 19 of the second coupling coefficient.

At the output of multiplier 22, a signal is generated corresponding to the average diameter of the material being monitored.

0U22 U, 9 (U | 8-fU20 + U, 3)

 Ul9 (U, 8 + U20 + U || / Ul2),

U22 U, 9 (U, 8 + U20 + U9 / U, o) K | dcp.

The signal at the output of counter 9 corresponds to the total time of the sensor’s 5 blocked beam during the current measurement cycle

U9 KLS signal at the output of the second counter 10 corresponds to the number of overlaps of the beam

in chunks, i.e. the number of pieces flying through the sensor zone during the current measurement cycle of Uio Ccp.

The signal at the output of the smoothing filter 17 corresponds to the flow rate determined by the smoothed value of the Schmitt trigger signal 6

and, 7 I U6 (t) 6l7 (t-T),

where 17 (1-m) -pulse transition function of the smoothing filter 17.

The signal at the output of the setting device 20 corresponds to the degree of mutual overlap of the pieces in the sensor area

U20 U | 7-K.20 K20-K4-H KsH.

The Ki-Ks coefficients are the scale factors for the communication of physical time signals and their corresponding signals in the device.

The coefficient K20 is the transfer coefficient of the master 20 of the overlap factor.

Mutual overlap of pieces in the sensor zone reduces the number of beam overlaps and, accordingly, the signal Uio at the output of pulse counter 10. The effect of overlaps on the instrument reading is compensated with the help of a circuit: a smoothing filter 17, a setting unit 20 for the degree of overlap.

The value of the average size of the controlled material has the form

();

dcP (U,,

dcp Kb (K7 + NK8 +

whereKb is i.e; K7 U, 8; Ks

  - coefficients of the equation of communication.

This device has high accuracy with changes in the flow rate, which allows it to be used not only

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in those areas of the technological line where the material flow is constant, but also in other areas where pieces of material of this class of particle size fall freely, for example, a transshipment point of a conveyor line.

Claims (1)

Invention Formula A device for controlling the size of crushed ore, containing an ultrasonic frequency voltage generator, a radiator, a receiver-converter, a resonant amplifier, an amplitude detector and a Schmitt trigger, a dividing unit, two AND gates, a timer, an inverter, a differentiator, two counters , an adder, a multiplier, two switches, two ratios of coefficients and a recording device, the ultrasonic frequency voltage generator connected to the input of the radiator and the first input of the first electric And, the second input of which and the first input of the first counter is connected to the Schmitt trigger output, the output of the first element And is connected to the first input of the second counter, the output of which is connected to the first input of the second element And to the first input of the first switch, the output of the first counter is connected to the first input of the second switch, the switch outputs are connected to 0 by the corresponding inputs of the dividing unit, the output of the second element I is connected to the second inputs of the switches, the output of the timer is connected to the second input of the second element I and to the input of the inverter, the output of the inverter is connected to the input of the differentiator, 5 the output of which is connected to the second inputs of the counters, the output of the division unit is connected to the first input of the adder, the second input of which is connected to the first coefficient setting unit, the output of the adder is connected to the first input of the multiplication unit, the second input of which is connected to the multiplication unit Connected to a recording device, characterized in that, in order to increase the accuracy of control, it is equipped g smoothing filter and the third factor adjuster, the input of which is connected to the output of the smoothing filter, whose input is connected to the output of the Schmitt trigger, the output of the third factor setting unit is connected to the third input of the sum0 torus, and the third input of the second element I is connected to the output of the first counter. 0