SU914085A1 - Apparatus for automatic control of disintegration process in open-cycle ball mill apparatus for automatic control of disintegration cycle with classification in hydraulic cyclone type apparatus - Google Patents

Description

The invention relates to devices for automatic control of the grinding process in multi-chamber ball mills and can be used in chemical, mining and processing, cement and other industries that use fine grinding of materials without the supply of liquid components.

A device for automatic control of the grinding process in an open-cycle ball mill is known, which includes a sensor for the degree of loading of the mill's crushing zone, connected through the first amplifier to the first input of the mill loading regulator with a material, the setting knob of the loading regulator connected to the second input of the regulator and the dosing device which input is connected to the output regulator, and the output - with the third input of the regulator. A microphone was used to control the degree of material loading, as well as other indicators of the state of the grinding process at the beginning of the first chamber (crushing zone). The regulator maintains the specified ratio

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between the degree of loading of the beginning of the first chamber · (crushing zone) and the consumption of material. The ratio should correspond to the value Ц predetermined for the mill].

However, for a number of plants, such a device is not sufficiently effective, since the information on the grinding process contained in an indirect signal obtained, for example, using a microphone or an induction sensor installed near the crushing zone, reflects the indicators of the state of the grinding process in the crushing zone (first of all, the degree of filling of the beginning of the first chamber, the granulometric composition of the starting material and its strength in relation to the impact) and does not reflect the indicators of the state of the process in the abrasion zone.

The most important stage of the process of fine grinding, which determines the quality of the finished product, is not crushing, but the very fine grinding of materials, which is carried out mainly in the abrasion zone. In a three-chamber ball mill open cycle

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for grinding cement mix this zone is located at the beginning of the second chamber, and in the similar two-chamber one at the end of the first one. Moreover, fine grinding in the zone is achieved both due to impact, and to a significant degree due to crushing and abrasion. Therefore, indicators of the state of the process in the abrasion zone are: the degree of filling the zone with material and grinding bodies, the particle size distribution of the material in the zone and its strength with respect to impact, crushing and abrasion.

The purpose of the invention is to improve the quality of management.

The goal is achieved by the fact that 15 roystvo Device for automatic control of the grinding process in a ball mill open cycle comprising loading degree sensor mill grinding zone is connected via a first amplifier with a first house ₂₀ vho- pictures mill load controller setpoint load controller is connected to the second the regulator input, and the metering device, the input of which is connected to the regulator output, and the output - to the third input of the regulator, is equipped with a sensor for the degree of loading of the mill abrasion zone, A second amplifier, a correction controller with a dial, the output of the sensor of the degree of loading of the mill abrasion zone after _{30, the} second amplifier is connected to the input of the correction regulator, and the output of the correction regulator is connected to the fourth input of the controller of the mill loading material.

The drawing shows a diagram of the device. ³⁵

The device includes a sensor 1 of the degree of loading of the crushing zone, an amplifier-transforming unit 2, a regulator 3 of the load, a dosing device 4, a setting unit 5 reg.-. loading controller, sensor 6 of degree of loading ^{40 of the} zone of abrasion, amplifying and converting unit 7, correction controller 8, unit 9 of a correction regulator, two-chamber ball mill 10.

Sensor 1 controlling the degree of loading of the crushing zone ^{45 is} connected to the input of the amplifier-converting unit 2, the output of which is connected to the first input of the loading regulator 3, to the second input of which the output of the metering device 4 is connected, whose signal ⁵⁰ corresponds to the amount of material fed to the mill.

To the third input of the load controller is connected to the output of the knob 5 of the boot controller. 6 isti- degree sensor ⁵⁵ Rania loading zone is connected to the input of the second amplifying and converting unit 7, whose output is connected to the first input of the correction controller 8, to the second input of which is connected the output setpoint correction controller 9. The output of the correction regulator is connected to the fourth input of the load regulator, the output of the load regulator is connected to the input of the metering device 4. As a metering device can be used as a weight metering device or other devices, such as a plate feeder with an adjustable speed of rotation of the plate or with an adjustable knife position, moved by the actuator.

The device works as follows.

The load controller 3 maintains a certain relationship between the signal of the sensor 1 of the load level of the crushing zone and the signal of the flow sensor of the metering device 4, changing the material flow relative to the nominal load level set by the load controller 5. If the signal of the sensor of the degree of loading of the abrasion zone corresponds to the minimum deviation of the fineness of the material coming out of the mill from the required norm, the signal from the output of the amplifier-converter unit 7 is equal to the value set by the setting device 9 and to the input of the controller 3 loads from the output of the correction regulator 8 receives a zero signal.

The deviation of the signal of the sensor degree of loading of the zone of abrasion from the specified value, caused by changes in the characteristics of the mill and other specified reasons, leads to the appearance of the correction regulator 8 of the control signal.

This signal is summed with the signal of the setting device 5, thereby changing the 3 loads specified by the controller. In the case of reducing the signal of the sensor of the degree of loading of the zone of abrasion from the output of the correction regulator 8, a negative signal is sent to the input of the controller 3 of the load, reducing the task to the loading regulator, which controls the material flow to the mill.

This reduces the material consumption at the mill inlet, which leads to a decrease in the amount of material fed to the abrasion zone, and returning the sensor signal of its degree of loading to a predetermined level.

In the case of an increase in the signal of the sensor of the degree of load of the abrasion zone, from the output of the corrective regulator 8 to the input of the regulator 3 of the loading a positive signal is received, which increases its setting. This increases the consumption of material at the mill inlet, which causes an increase in the amount of material entering the abrasion zone,

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and returning the sensor signal of the degree of its load to the specified level.

Stabilization of the signal from the loading zone of the abrasion zone improves the accuracy of maintaining the grindability specified by the technological requirements, since increasing the degree of loading of the abrasion zone deadens the grinding, and lowering it leads to over-grinding of the material at the mill output. Implementation of the invention will improve the quality of the grinding product, increase the productivity of the grinding unit and reduce the specific energy consumption for grinding materials.

Claims (1)

Claim A device for automatic control of the grinding process in an open-cycle ball mill, which includes a sensor for the degree of loading of the grinding mill zone, is connected through the first amplifier to the first input of the mill loading regulator by the material, the setting regulator of the loading regulator connected to the second input of the regulator, and the dosing device whose input is connected to the regulator output, and the output is connected to the third regulator input, characterized in that, in order to improve the quality of control, the device is equipped with a load cell ki of the zone of attrition of the mill, a second amplifier, a correction controller with a setting device, and the output of the sensor of the degree of loading of the zone of attrition of the mill is connected to the input through the second amplifier 15 of the corrective regulator, and the output of the corrective regulator is connected to the fourth input of the regulator of the material loading of the mill.