Foreword

The intersection of medium and person who fill rub the intersection of ore and the intersection of medium and the intersection of steel and spheroid, accumulate, take the intersection of mill and the intersection of cylinder and effective percentage of volume mean resting ball mill, Until mean, rub the intersection of supplies and closely knit volume account for, ball-mill the intersection of space and proportion of volume indicate by decimal in the built-in medium nodules And rub the ore density mean ball-milling the weight of the built-in supplies and taking the mash total weight supplies water Percentage Three specifications studied while measuring and controlling by the ball mill load. These three parameters have reflected the load including ball load, supplies load and each number value of the water amount of the ball mill indirectly ,The load that could detect the ball mill accurately is that the whole ball mill controls the key to the success or failure rationally.

This text will design a kind of load detection system of ball mill based on information fusion of the multisensor, enable the internal load parameter of detecting the ball mill accurately: The medium fills than and rub the ore density rate, nodules with. Adjust the medium adding amount, amount of ore given according to need finally and for water amount, thus realize the purpose of the ball mill optimizes real time control.

Overall design of zero-one system

The information fusion of the so-called multisensor is to fully utilize a plurality of sensor resources, and observe the controlling and using rationally of information through the sensor to these, make a plurality of sensor redundant or complementary information on space or time up according to a certain criterion, in order to obtain the intersection of conformance and explanation of measurand or describe, make information system this obtain, make up partial the intersection of subset and characteristic of more superior systems that form than every of it from this. On the basis of the ones that handled target’s level, can be divided into: The data picture element Grade merge and the intersection of characteristic and magnitude merge with making policy grade merge.

This literary grace uses three factors sound, vibration and active power Detecting means, through the sound transducer separately, shake acceleration sensor and meritorious power level detector and carry on the data acquisition of the ball mill external answer signal, draw these three parameters after SIGPROC signal processing. For keep as many as possible field data, can all observation data fusion of sensor, and three sensor these belong to homogeneity whom sensor observed the same physical phenomenon ,Can carry on information fusion in the intersection of data and layer, in order to obtain many the intersection of ball mill and outside respond to information fully. Finally through merging algorithm last load parameter at ball mill indirectly ‘ medium last rate, nodules than and not lasting ore density .

2 designs the step

1Data acquisition of three external answer signals of ball mill

The collection circuit of the audible signal of the ball mill is by the microphone, pre-amplifier and signal amplifying circuit, resisting aliasing electric-wave filter, analog to digital converter, microprocessor treated section,etc. make up. The circuit of acquisition of signal of the sound is shown as in Fig. 1:

Circuit of acquisition of signal of the sound of Fig. 1

The runtime of the ball mill, between steel ball, supplies and cylinder, between the steel balls, the striking that is produced between steel ball and supplies causes the ball mill to shake, these bump into, transmit the intersection of ball mill and armoured cylinder to, and travel along cylinder and bearing. So, can measure the vibrational characteristic of the ball mill cylinder on the bearing of the ball mill, so adopt the piezoelectric acceleration transducer installed on bearing to measure the vibration of the ball mill. Ball mill shake the intersection of acquisition of signal and circuit include acceleration sensor, charge amplifier, the intersection of signal and amplifying circuit, band-pass filter, analog to digital converter, microprocessor,etc.. Shake the circuit of acquisition of signal and is shown as in Fig. 2.

The collection of the active power signal selects to measure with meritorious power level detector, because the ball mill electrical machinery power supply mode is a three phase three wire system, choose the three-phase meritorious power level detector. As to the detection of net horsepower signal of ball mill in this text, choose the meritorious power level detector of WB2P412R -type three-phase the strategic hinterland of China that mechnical