The Electronic Ear is specially developed for control and regulation of Ball Mills, using the grinding sound frequency signal for optimizing the Mill output. According to the material bed height, the grinding media causes a characteristic noise. In case of high material bed i.e. maximum filling level, there is a hollow grinding sound low grinding frequency. Whereas for low material bed i.e. minimum filling level, there is a high-pitched sound high grinding frequency. This characteristic of grinding frequency is sensed through Sound Sensor and the output of the Sensor is used to develop an output mA signal representing Mill filling level. This signal can be used for regulation of the feeding of the Mill and or for digital indication of the Mill filling leve
Electronic Ear is useful for Control & Regulation of Ball Mills, using the grinding frequency signal for optimizing the Mill Output. It consists of an acoustic signal receiver (Microphone Unit / Sound Sensor) and specially constructed indicating & interpreting electronic circuit (Control Unit). Depending on the height of the material bed, the grinding media inside the Ball Mill causes a characteristic noise.
In case of high material bed (max. filling level), there is hollow grinding sound (low volume & low grinding frequency), whereas for low material bed (min. filling level), there is high pitched sound (high volume & high grinding frequency). This characteristic of grinding frequency is used to develop an output signal representing mill filling level, which can be used for regulation of the mill feed and / or for digital
Construction: The Electronic Ear comprises of two parts viz. Microphone Unit (Sound Sensor) & Control Unit. The Microphone Unit comprises of a sturdy adjustable Bracket which permits radial and axial movement of the sound sensor, to suit the mounting requirement. Terminals are provided at the back, for termination of the signal cable. The Microphone Unit is to be connected to the Control Unit through a high quality single core shielded cable & it is to be mounted as near as possible to the jacket of the mill. Mounting stand is to be fabricated at site.