Ball mill load refers to the sum of the mill, ball load, material loading and water, it is an important parameter of the grinding process, a direct impact on the effect of grinding. , Due to fluctuations in ore properties and a range of external factors interfere with the operating level differences in the actual production process, so that the ball mill load is difficult to maintain the optimal level, you can not give full play to the ball mill effect, therefore, in the grinding process automatically control, detection and control of the ball mill load is the most important elements of the ball mill automatic control.
Direct detection of the ball mill load
A function of the slurry surface and ball mill loading rate has a close relationship exists between the slurry surface in the ball mill and the mill’s production. Measuring ball mill slurry surface electrodes, the detector can determine the height of the pulp side of the ball inside the electrode output.
The indirect detection of the ball mill load
The operating characteristics of the wet ball mill can be directly useful power consumption to describe. When the mill and its speed are fixed, according to theoretical calculations and actual test results show that there is a certain relationship between the ball mill motor active power and the ball mill load. The ball mill load increases, the beginning of the active power of the mill motor significantly increased to reach a certain extreme value, with the increase of the ball mill load, active power, the worse this extreme value can be regarded as the best point of the ball mill load. Therefore, the useful power is directly related to the ball mill load.
Ball mill operation, the grinding media and materials to indulge in one side of the mill, and continue to roll slip and the whereabouts of the impact of abrasive materials, the rotating part of the mill is in a serious imbalance caused by the unbalanced centrifugal force, so that the mill system vibration. The mill speed is constant vibration intensity and grinding materials related to detect the vibration of the mill intensity can indirectly reflect the material load in the mill.
Differential electromagnetic sensor method
Differential electromagnetic sensors by the Bulgarian Central Institute of Automation Science Research, and has been patented. Only measure the useful signal part of the mill shell vibration, and eliminate the interference signal. The sensor can be installed at 71 ~ 80mm away from the ball mill chassis, in the distance range of the output signal is almost nothing to do with the change in distance. High reliability and sensitivity of the sensor signal transmission delay smaller. However, this detection system can not detect a ball mill media filling rate of material to ball ratio and grinding the ore concentration value.
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