SU442833A1 - Device for automatic control of the loading of ventilated drum mills with an intermediate hopper by balls - Google Patents

Description

one

This invention relates to the field of grinding material in ball drum-ventilated mills operating with an intermediate hopper.

Devices are known for automatically controlling the loading of balls with mills, including their motor feeder, as well as mill and ball loading motors, sensors of the state of the motors of the feeder and mill, starting relay, limiting relay, inverters, regulator, setting indicator and energy indicator sensor, coincidence circuit amplifiers.

In known devices for automatically controlling the loading of balls by drum mills, the principle of measuring the energy performance of mills (active current or power), which characterizes the ball mode, and maintaining the constancy of this indicator in the process of grinding the material by changing the number of balls entering the mill, is used.

The disadvantage of these devices is the effect on the energy indicator of the strength parameters of the material being crushed, as well as the grinding conditions.

The purpose of the invention is to improve the quality of the crushed material as a result of a more accurate mode of maintaining ball loading.

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This is achieved by the fact that the inputs of the first coincidence circuit are connected to the mill motor state sensor, the energy indicator sensor via the limiting relay and the feeder motor state sensor through the first inverter, and the output of the first coincidence circuit is connected to the inputs of the second and third coincidence circuit. are also connected to a regulator, the input of which is connected to the setting device and the energy indicator sensor, and the input of the third coincidence circuit is connected to the controller through the second inverter, and the outputs of the second second and third coincidence circuits through amplifiers respectively connected to the motor and ball load motor starter relay feeder.

In this connection of the device elements, automatic dosing of balls into the mill is carried out only during the start-up process.

grinding unit when there is no grinding material in the mill and therefore the energy indicator will be associated only with the ball loading of the mill.

Grinding units with ball drum mills and intermediate bunkers belong to periodically operating units, which are included at the lower limit value of the level of crushed material in the intermediate bunker

on and off when reaching the limit

upper value. Since during the time required for filling the intermediate hopper with crushed material the balls wear is small, the ball loading fluctuates due to the fact that the balls are automatically dispensed only during the start of the grinding unit, will also be small. Their value will be much less than the magnitude of oscillations of the ball load with continuous adjustment, when the value of the energy index is influenced by the strength characteristics of the material being milled and the grinding conditions.

The drawing shows the proposed device and the following indications, notation: 1 - engine of the feeder of the ground material, 2 - mill motor, 3 - sensor of the motor state of the feeder, 4 - sensor of the energy indicator of the mill,

5- sensor of engine mill status,

6 - setting device, 7 - first inverter, 8 - limiting relay, 9 - second inverter; 10 is the regulator, 11 is the first matching circuit, 12 is the second matching circuit, 13 is the third matching circuit, 14 and 15 are amplifiers, 16 is the starting relay of the motor of the feeder, 17 is the engine of the ball feed to the mill.

The device works in the following way.

The first coincidence circuit (I) 11 receives signals from sensor 5 of motor 2, from sensor 3 of motor 1 passing through the first inverter 7, and from sensor 4 passing through limit relay 8. When the mill is started, during the acceleration transition period, the value the energy index will be very large and from the limiting relay to the input of the circuit I will receive a prohibitive signal. The resolution signal from relay 8 is fed to the input of circuit 11 when the energy index reaches a certain value, which characterizes the end of the transient process. Thus, if there are signals about the normal operation of the mill, the engine 1 stopped and the end of the transition process of the mill engine start, the output enable signal from the circuit 11 is fed to the second and third coincidence circuits 12 and 13.

The value of the energy indicator of the mill from the sensor 4 is fed to the input of the regulator 10, which also receives a signal from the setter 6. The signals from the circuit 11 and the regulator 10 are fed to the inputs of the second and third coincidence circuits 12 and 13 ("I"), and the output the regulator 10 is connected to the coincidence circuit via the second inverter 9. The regulating effect from the regulator 10

in the presence of an enabling signal from the circuit I, through the coincidence circuit 13 and the amplifier 15 is fed to the ball loading motor 17. In the absence of a regulating action from the regulator and the presence of an enabling signal

The circuit from circuit I and circuit 12 through amplifier 14 turns on a start relay 16 of the engine. The next switching on of the device is possible only at the next start-up of the grinded aggregate.

Subject invention

A device for automatic regulation of loading with balls of drum-ventilated mills with an intermediate bunker; different

By the fact that, in order to increase the quality of the crushed material as a result of more accurate maintenance of ball loading, the inputs of the first coincidence circuit are connected to the mill motor sensor, the energy indicator sensor through the limiting relay and the feeder motor state sensor through the first inverter, and the output the first matching circuit is connected to the inputs of the second and third matching circuit,

the inputs of which are also connected to the controller, the input of which is connected to the generator and the energy indicator sensor, the input of the third coincidence circuit is connected to the controller through the second inverter, and the outputs

The second and third matching circuits through amplifiers are connected respectively to the ball loading motor and the starting motor relay.

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