Frequency conversion power saving control method of ball mill

Abstract

The invention discloses a frequency conversion power saving control method of a ball mill, which is realized with the following method: 1. starting a ball mill, and initializing a preset controller in the ball mill; 2. operating the ball mill according to the preset frequency; 3. detecting the stator current instantaneous value of the stator current of the AC asynchronous motor of the ball mill, and detecting the stator current instantaneous value by a U\V\W three-phase current Hall sensor arranged in a transducer; 4. calculating the average torque current, current undulation frequency and amplitude of the stator current of the AC asynchronous motor of the ball mill, obtaining the current torque component, current undulation frequency and amplitude according to the rotor magnetic field orientation and vector change on a synchronous rotating coordinate system; 5. in the grinding initial stage, controlling the cylinder of the ball mill to carry out pendular movement according to the calculation result so as to obtain the effect that a dielectric sphere and grinding material are in parabola falling state in the cylinder; and 6. in the middle and later grinding stage, controlling frequency to continuously drop according to the control frequency calculation result of a loading torque.

Description

technical field [0001] The invention relates to a frequency conversion and power saving control method of a ball mill. Background technique [0002] In ceramics, cement, chemical industry, building materials and other industries, ball mills are very important equipment with high power and long running time. At present, the control of ball mills generally adopts methods such as power frequency non-regulation, electromagnetic speed regulation or frequency conversion speed regulation. Among them, the frequency conversion speed regulation control mode is flexible, high precision, good reliability, and is adopted more and more. In the existing frequency conversion control of the ball mill, the multi-stage speed setting method is mostly used, that is, the multi-stage grinding speed is preset in one grinding cycle, and each stage lasts for a certain period of time. Grinding speed and grinding time are set according to experience. However, in actual production, the quality, mater...

AI Technical Summary

Problems solved by technology

However, in actual production, the quality, material, and particle size of each batch of abrasives are different, so it is difficult to achieve the best preset speed and time. Not only that, due to the deviation of grinding speed and time, excessive grinding or insufficient grinding often occurs. However, the fineness of different batches varies greatly, and the product quality is difficult to guarantee. In addition, its power consumption is huge, which is not conducive to energy saving.

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