SU755302A1 - Method of automatic control of double-chamber separating-mill charging - Google Patents

Description

The invention relates to the automation of grinding processes and can be applied in industries that use grinding materials.

There is a method of automatic control of the grinding process in a separator mill, which consists in feeding grains into the first and last chamber of the mill, measuring electroacoustic signals at the entrance to the first and last chamber and feeding grains into the last chamber in direct proportion to the difference between the measured acoustic signals at the entrance to the first and last chamber of the mill Sh. The under-known method is related to the fact that it does not take into account fluctuations in the redistribution of grains in the chambers to the mode of operation of the first camera.

The control of the loading of the second frame is constantly changing, the amount of grains entering the first chamber changes, which causes a sharp change in the amount of starting material. This leads to auto-oscillations in the system and loss of performance.

There is another way to automatically control the loading of a two-chamber separator mill, from Ele-3.

2

regulating the loading of the second chamber according to its noise by redistributing the circulating load to adjusting the supply of raw materials by loading the second q of the measure [2]. This method is closer to the described invention.

The disadvantage of this method is that the stabilization of the loading of the first and second chambers does not take into account the change in the grindability of the feedstock. Changes in the grindability of the feedstock require periodic adjustment of the tasks to the stabilization circuits. Manual adjustment leads to loss of productivity of the mill due to lack of accuracy and untimely adjustment of tasks.

The aim of the invention is to improve the performance of the mill.

5 This is achieved by the fact that in the method of automatic control of the loading of a two-chamber separator mill. An elevator that includes the regulation of the loading of the first chamber based on its noise

Oh with the impact on the original feed

3

755302

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raw materials, regulation of the load of the second chamber for its noise with the impact on the redistribution of the circulating load and the adjustment of the supply of raw materials, the power is additionally measured by the load of the second chamber.

drive elevator and maintain the extra- ** Relative power value by further adjusting the feedstock feed to the first chamber.

The essence of the method is, "

next. ’

Changes in the grindability of raw materials to optimize the operation of the mill require constant adjustment of tasks to the chambers of stabilizing the loading of chambers. The loading of the first chamber is most sensitive to 15 changes in the grindability of the raw materials. The indicator of the consumption of the crushed material of both chambers is the elevator load, measured as the elevator drive power 20.

The change in the grindability of the feedstock has a smaller effect on the productivity of the second chamber than on the performance of the first chamber, therefore, when the loading of the second chamber stabilizes, the productivity of the mill will be insignificant.

In turn, the stabilization of the loading of the second chamber makes it possible to achieve a constant output of the crushed material from the second chamber and thereby eliminate the influence of the output of the crushed material from the second chamber on the load of the elevator.

In this case, the load of the elevator, measured as the drive power of the elevator, will reflect changes in the grindability of the feedstock and the grinding conditions in the first chamber. 40

The dependence of the power of the elevator drive on the amount of crushed material leaving the first chamber has an extreme character, since with the initial loading of the mill 45 with an increase in the load of the first chamber increases and the load of the elevator. · With a further increase in the load of the first chamber, the grinding conditions in the first chamber are broken, the return increases 59

Krupki, there is an accumulation of material 'in the pot, which leads to the occurrence of a pre-emergency situation, i.e. the so-called "blockage". -At the same time, the yield of the crushed $$ material from the first chamber is reduced and the load of the elevator decreases. Thus, the maximum load of the elevator when the loading of the second chamber is stabilized corresponds to the maximum yield of ground material from the first chamber. 60 When changing the grindability of raw materials by searching for the maximum load of the elevator, the maximum performance of the two-chamber separator mill is ensured. 65

The drawing shows a block diagram of the device with which the method is carried out. . ·

The noise of camera 1 is perceived by microphone 2 and fed to the Interference-3 compensation block, from the noise-compensation block 3, a signal functionally connected with loading only camera 1, through a recording device 4 showing the load level of camera 1, the electronic controller 5 and the control magnetic amplifier b act on the executive mechanism 7. The latter, in turn, controls the selenium magnetic amplifier 8, which, using a DC motor 9, changes the speed of rotation of the disc feeder 10, varying the amount of the original cheese served in chamber 1.

The noise of the camera 11 is perceived by the microphone 12. The received signal enters the noise compensation unit 3 and then through the registering device 13, which displays the load level of the camera 11, into the electronic controller 14, where the signal goes through the magnetic amplifier 17 of the undersized material through the magnetic amplifier 15 and the actuator 16 classified in the separator 18. The signal from the output of the regulator 14 is also fed to the input of the regulator 5 through the dynamic correction unit 19. The separator 18 sends grinding products from chamber 1 and 11 to Elevator 20.

The drive power of the elevator is measured by a sensor 21, the output of which is fed to the input of the extreme regulator 22, and the output of the regulator 22 is fed to the input of the regulator 5 loading the first camera.

The control method can be carried out on the basis of elements of local automation and with the help of a multi-channel control unit.

Claims (1)

Claim A method for automatically controlling the loading of a two-chamber separator mill with an elevator, including regulating the loading of the first chamber in relation to its noise with an impact on the feedstock feed, regulating the loading of the second kagler due to its noise with an impact on the redistribution of the circulating load characterized in that, in order to improve the performance of the mill, they additionally measure the elevator drive power and maintain an extreme power value by additional correction5 755302 feed feeds in the first chamber.