SU1297935A1 - Method of automatic control of screen operating conditions - Google Patents

Abstract

The invention is intended for the separation of bulk materials by size at the beneficiation plants of ferrous and non-ferrous metallurgy, in the coal, mining and chemical, and construction industries. The invention allows with high accuracy to regulate the operation mode of the screen (G), reducing the height of the layer of material (HSR) on the G-s screen to a constant level corresponding to the optic. full mode of operation. For this, the high-speed rail on the sieve G and the frequency of vibration (CV) of the sieve G in the horizontal and vertical planes are automatically measured simultaneously. The current FW is compared with the preset FW sieve G, corresponding to the constant high-speed rail on the sieve G in the optimal screening mode. A mismatch signal is determined which, taking into account the sign, is fed to the controller. Here, a regulating action is produced, which through the actuator controls the IV on the sieve G in proportion to the magnitude and sign of the deviation. 3 pe. (About the joint venture "G 00 SP

Description

The invention relates to the field of separation of bulk materials by size and can be used for enrichment; The factories of ferrous and non-ferrous metallurgy, in the coal and 1 ore-chemical industries, in the construction industry, where bulk screening is used.

The aim of the invention is to improve the accuracy of controlling the operating mode of the screen.

FIG. 1 shows a block diagram of a device implementing the method of FIG. 2 - image of vibration sensor signals, measured in two directions, on the scale of the measuring instrument; FIG. 3 is a graph of the height of the layer of material on the sieve on the magnitude of the vibration.

The essence of the method is that continuous measurements of the height of the layer of material are made and, simultaneously, measurements of vibrations in two directions corresponding to this height, the output signals of the vibration sensors are output to the measuring device, the measurement of the measuring device is consistent with the current height of the material layer on the sieve rumble signal zadani largest magnitude vibration. The minimum frequency of the vibration of the screen is set, which ensures a constant value of the layer of material on the screen of the screen. The signal of the job according to the magnitude of vibration in accordance with the current value of the height of the layer: material on the sieve is introduced into the controller. Depending on the sign of the error signal, a regulating signal is produced that corresponds to the optimal operating mode of the screen, i.e. depending on the size and sign. deviations proportionally change the frequency of the screen sieve vibration.

The device (Fig. 1), which implements a method for automatically adjusting the operating mode of the screen, includes vibration sensors 1 and 2 of the frequency of vibration of the screen in horizontal and vertical planes, filters 3 and 4, amplifiers 5,6 and 9, measuring device 7, sensor 8 layers of material on the screen, unit 10 of comparison, amplifier 11 of the error signal, controller 12 and executive mechanism 13

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The image of the signals from vibration sensors measured in two directions on the scale of the measuring device (Fig. 2) corresponds to the optimum screening mode, in which continuous control of the vibration frequency in accordance with the continuously measured height of the material layer on the screen of the screen reduces this height to a constant level corresponding to the optimal screening mode.

The constant height of the layer of material on the sieve, which corresponds to the optimum screening mode, is achieved by automatically controlling the frequency of the screen vibration (Fig. 3). The optimum frequency of screening corresponds to the minimum frequency of vibrations from the frequencies that ensure a constant height of the layer of material on the sieve hj .. (in FIG. 3, this is the point of the curve in which hcons-t provides). I

The device that implements the method works as follows (figure 1)

Vibration sensors 1 and 2, installed in two directions on the screen of the screen, give signals about the vibration frequency through filters 3 and 4, amplifiers 5 and 6 to the measuring device 7, on the scale of which a signal appears. From the output of the measuring device 7, a signal on the magnitude of the vibration frequency is fed to the comparator unit 10, where simultaneously through the amplifier 9 a signal is received on the current height of the material layer on the screen of the screen removed by the sensor 8 of the height of the material layer on the screen. Block 10 compares the magnitude of the vibration frequency signals at the current height of the material layer on the sieve with the vibration setting signal, which ensures a constant height of the material layer on the screen sieve in the optimum screening mode, when a constant level of the height of layer b is reached. minimum of the frequencies of vibrations that provide this height. A mismatch signal is obtained, which, taking into account the sign, through the amplifier 11, is supplied to the controller 12, producing a control signal which is fed to the actuator 13, depending on the sign of the mismatch, as a result of which the vibration frequency of the rumble changes accordingly.

Claims (1)

Invention Formula A method for automatically adjusting the operating mode of the screen, based on measuring the frequency of vibration of the screen in horizontal and vertical planes, characterized in that, in order to increase the control accuracy, the height of the layer of material on the screen is determined. An increase in the frequency of vibration of the screen, which ensures a constant value of the layer of material on the screen of the screen, determines the magnitude and sign of deviation of the specified and current frequency of screen screen vibrations with the measured height of the layer of material on it and changes the frequency of screen screen vibrations in proportion to the value and sign of deviation. S A Fi & .2 Fig.Z  -ft} jj Editor O. Yurkovetska Order 844/10 Circulation 539Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 Compiled by V. Persits Tehred M. Morgental Proofreader E.Roshko