SU923611A1 - Device for automatic regulating of two-stage grinding cycle - Google Patents

Description

The invention relates to a device for automatic control of a two-stage process of grinding materials with a self-grinding mill in the first stage and a domola ball mill operating in a closed loop with a classifier in the second stage. The invention can be used in mining, cement, chemical and other industries' industries, which use fine grinding of materials in two hundred; diya

A device is known for automatically optimizing the process of grinding raw materials in wet self-grinding drum mills. This device can be used to control the grinding process in wet self-grinding drum mills operating in the first stage of a two-stage cycle. In it, the loading of the material to be ground and the grinding bodies are controlled, supported2

live extreme value of the reactive power factor of the mill drive motor [ΐ}.

The disadvantage of this device is that it does not take into account the amount of power consumed to overcome the friction forces in the mill mill support bearings, which varies with the degree of filling of the mill, the density of the material to be grinded and the proposed as the unit is worn.

The closest to the present invention is a device for automatic regulation of a two-stage grinding cycle of self-grinding mills connected in series with a classifier and a blast mill, including a power sensor of a driven motor of a self-grinding mill, the output of which is connected to the first input of an extreme power regulator of a driving motor of a self-grinding mill,

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and the output of the extreme regulator is connected to the input of the executive mechanism for changing the flow rate of the initial components of the charge into the self-grinding mill (2}. 5

The disadvantage of this device is that it does not take into account changes in grinding conditions

'-in a grinding mill caused, for example, by fluctuations in strength

the properties of the comminuted material and equipment wear, which leads to a decrease in control efficiency and the possibility of overloading the second stage, the elimination of which leads to $ 1

reduce the performance of the unit.

The purpose of the invention is to improve the quality of regulation. 20

This goal is achieved by the fact that the automatic control device of a two-stage grinding cycle from self-grinding mills in series with 25 ·· classifier and a domol ball mill, which includes a power sensor for a self-grinding mill electric motor, the output of which is connected to the first input of an extreme-power regulator for a power-generating mill motor autogenous and extreme regulator output connected to an input of the actuator ₃₅ changes SUPPLIES a batch of the starting components in an autogenous mill, the mill is provided with a sensor of the total product flow autogenous mill and final grinding. ^ element ₄₀ neniya comparison and multiplication unit, the flow sensor in the initial charge components autogenous mill, and the detecting element setting unit, the output of sensor ₄₅ cumulative distribution course ^ of the product of the self-grinding mill and the domol mill is connected to the first input of the reference element, to the second input of which the output of the setter is connected, the output of the comparison element is connected to the input at the detecting element, the output of which is connected to the first input of the multiplication unit, the second vrhd of which is connected to the output of the flow sensor of the source com-

• Ponents of the charge in the mill of self-grinding, and the output of the multiplication unit is connected to the second input of the emergency regulator.

The drawing shows a block diagram of the proposed device.

The device includes a self-grinding mill 1, a classifier 2 for separating the finished product, a ball grinding mill 3, a sensor 4 of the total consumption of the product of a self-grinding mill and a grinding mill ball into the classifier, a comparison element 5, a 'setpoint 6, a detecting element 7, a multiplication unit 8, sensor 9 consumption of the initial components of the mixture in the mill autogenous grinding, extreme regulator 10 of the power of the drive motor of the self-grinding mill, sensor 11 useful power of the self-grinding mill, executive mechanism gp 12 changes -.raskhoda starting components Shih - you in the autogenous mill.

The output of the mill 1 self-grinding is connected to the input of the classifier 2, to which is also connected the output of the ball mill 3 of the final grinding. The output of sensor 4 of the total consumption of the product of the mill autogenous grinding and grinding mill in the classifier is connected with the first input of the comparison element 5, the second input of which is connected to the output of the setter 6. The output of the comparison element 5 is connected to the input of the detecting element 7, the output of which is connected to the first input of the block 8 multiplication, the input of which is connected to the output of the sensor 9 of the flow rate of the initial components of the mixture in the mill autogenous. The output of the multiplication unit 8 is connected to the first input of the extreme regulator 10, to the second input of which the output of the sensor 11 of the useful power of the self-grinding mill is connected. The output of the extreme regulator 10 is connected to the input of the actuator 12 for changing the flow rate of the initial components of the charge into the self-grinding mill.

To illustrate the operation of the device. We assume that the initial components are crushed in a self-grinding mill 1, from which the grinding product, together with the product of the grinding mill 3, is fed into the classifier 2, which separates the finished product from the coarse fraction. Block 5 comparison generates a signal equal to the difference of the measured value of the total material consumption in the classifier 2. And the boundary5

a specific value determined by the setting unit 6. The detecting element 7 reproduces the input signal, if the total material consumption in the classifier 2 exceeds the limit value, and otherwise the signal at the output of the detecting element 7 is absent. The multiplication unit 8 generates a signal equal to the product of the measured value of the flow rate of the initial components in the mill 1 self-grinding and the output signal of the detecting element 7. Extreme controller 10, the inputs from which with different signs receive a signal from the output of the multiplication unit 8 and the measured value of the useful power equal to the power difference the electric motor and the power expended to overcome the friction forces in the bearings, produces a regulating signal that supports the extreme value of the difference of the input signals cash. The actuator 12 changes the consumption of the initial components in the self-grinding mill in accordance with the output signal of the extreme regulator 10. When grinding conditions deteriorate in the second stage, caused, for example, by deterioration of the material grindability, wear of the grinding bodies and the lining of the grinding mill 3, the circulating load in a closed cycle, and the grinding mill is overloaded with material. This leads to an increase in the size of the finished product and a sharp decline in the performance of the entire process Chhemas. In addition, the probability of overcrowding is significantly increased.

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grinding mills with crushed material * rial ("dam" mill). In such conditions, it is necessary to reduce the proportion of the output of the first stage in the power supply of classifier 2. To do this, the measured value of the power consumed by the self-grinding mill drive motor 1 is adjusted by subtracting from it a value proportional to the flow rate of the original components. The coefficient of proportionality is equal to the deviation of the total consumption of material in the 'classifier 2 from the limit value. ‘Correction introduced leads to

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artificial displacement of the extreme static characteristic of an autogrinding mill towards lower values of the consumption of the initial components. As a result, the extremum regulator 10, jointly with the actuator .12, reduces the power supply of the autogenous grinding mill 1, which leads to a decrease in its output: juicy. performance and thereby allows the ball mill 3 interlining to maintain normal operation without overloading. If the grinding conditions in the second stage correspond to the normal course of the technological process, then the total material consumption in classifier 2 is lower / boundary value, and the extreme regulator 10 forms 20 control actions that maximize the power consumed by the self-chopping motor 1.

The implementation of the proposed device allows improving the performance of a two-stage grinding cycle, reducing fluctuations in the size of the finished product, and eliminating the occurrence of emergency overloads of 30 blinder mills operating in the second stage. .

Claims (1)

Claim Further, regulation device ³⁵ of automatic two-stage grinding cycle tion of serially connected with autogenous mill and ball mill classifier Domo "la, including power sensor pri40 water motor mill self-grinding, the output of which is connected to the first input of the extreme drive power regulator. mill motor ⁴⁵ samoizmel cheniya and extreme regulator output is connected to the input of the executive components initial flow change mechanism in charge autogenous mill, ⁵⁰ differs w o f e c i in that s.tselyu povyl. ' control quality, it is equipped with a sensor for the total consumption of the product of the mill self-grinding and grinding mill, a comparison element and multiplication unit, a sensor for the consumption of the initial components of the charge in the self-grinding mill, the setting device. and a detecting element} 7 923611 8 wherein the sensor output product total mill flow samoizmelche ¹ Nia and final grinding mill connected to lane ⁴ vym comparison input element to the second input of which is connected ₅ control unit output, the output of the comparison element is connected to the input of the detecting element, the output of which is connected to the first input of the multiplication unit, the second input of which is connected to the output of the flow sensor of the initial components of the charge to the self-grinding mill, and the output of the multiplication unit is connected to the second input of the extreme · go regulator.