This sound is caused by the grinding ball hitting the mill lining and the material in the mill. A high noise level indicates an underloaded mill and a low noise level indicates an overloaded mill. Both these conditions result in reduced grinding efficiency. The sound sensor, mounted near the ball mill, gives an AC signal proportional to the ...
Typical noise levels at the operator's position during normal operation are as follows: AWeighted sound pressure level measurements will be or lower. CWeighted instantaneous sound pressure levels will be or lower. LwA (sound power level Aweighted) will be or lower.
It has undergone an important evolution lately. Originally it was considered that a SAG mill should work at 810% ball content. Lateron, larger mill sizes and larger processed tonnages have led to operations at 1014% level. Current practice in many plants calls for levels of 1315%.
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 ...
The noise can reach to about 100 to 115 dB (A) that will badly influence the workers' health. How to control the noise of ball mil in the course of grinding materials? The key point is to: 1. Control the noise output of the ball mill during the material grinding by engineering measures; 2. Control the speed of spread receive of noise
Request PDF | Experimental investigation of load behaviour of an industrial scale tumbling mill using noise and vibration signature techniques | Mill load ( the load level of coal powder ...
Hi List: We have an application in a SAG Mill where we have installed an electronic ear in order to listen the noise produced by the balls falling to the bottom of the mill. Our idea is to convert the amplitude and frequency of noise to a 420mA signal (or something else) in order to determine if the ball is crushing the mineral or the mill lining.
Abstract. The noise generated by a ball mill during a batch grinding operation is investigated and the results show that, for a given ore, the noise levels may vary with time of grind, ore charge weight and mill speed. The role of the ore in absorbing noise energy is suggested as a possible control variable for the grinding process and as an ...
ball mill, and spra y dr ying; ... The noise levels were measured using the sound level meter (S/N:) with a measuring range of (30 to 130 dB) and an accuracy of dB. The measurements ...
PEPL PEPL INTRODUCTION The Electronic Ear type PI 213 is a magnetic Sensor also know as Sound Transmitter, which is using the mill shell as Membrane. This means the Sensor is only detecting the mill shell vibrations, caused by the Grinding balls hitting the mill lining and material in the mill, and so the Pyrotech Noise Level Sound Transmitter system is insensitive to foreign acoustic noise ...
The purpose of wrapping ball mills with thermal/acoustic blankets is twofold: (1) to maintain the desired temperature inside the mill and (2) to reduce the sound emanating from the mill. This field case study focuses solely on the latter, evaluating and documenting the sound level reduction attributed to the installation of the blankets and its ...
The ball mill can Reduce the ball mill noise below the allowable standard. (3) The ball mill uses a rubber liner instead of a manganese steel liner. The noise level can be reduced by 9dB (A), and the frequency spectrum characteristics of the ball mill are also changed from high frequency to low frequency. Ball mill design soundproof room.
Results per the study present an indication that mill noise has the potential to inform the nature of ore material in the mill and slurry solids loading, ... Investigation on measuring the fill level of an industrial ball mill based on the vibration characteristics of the mill shell. Miner. Eng., 22 (14) (2009), pp. .
Introduction. The Electronic Ear type PI 213 is a magnetic Sensor also known as Sound Transmitter, which is using the mill shell as a Membrane. This means the Sensor is only detecting the mill shell vibrations, caused by the Grinding balls hitting the mill lining and material in the mill, and so the Pyrotech Noise Level Sound Transmitter system ...
The mill noise and trunnion vibration signals were collected by a microphone and an accelerometer. ... Investigation on measuring the fill level of an industrial ball mill based on the vibration characteristics of the mill shell. Miner Eng 22(14):. Article Google Scholar Kantardzic M (2011) Data mining: concepts, models, methods, and ...
A ball mill also known as pebble mill or tumbling mill is a milling machine that consists of a hallow cylinder containing balls; mounted on a metallic frame such that it can be rotated along its longitudinal axis. ... High machine noise level especially if the hollow cylinder is made of metal, but much less if rubber is used. 3. Relatively long ...
Main products are High Speed Noncontact Kiln Shell Temperature Scanning System, Grinding Ball Mill Sound Level Measuring System (Electronic Ear), Furnace Interior Monitoring System (High Temperature Industrial TV System) etc. Widely used in Construction Material, Ceramic, Chemical, Metallurgy, Glass, Heat Treatment, New energy, New Material ...
It was indicated that level of the acoustic noise generated during mill operation is more associated with steel ball filling rate rather than the mill speed. Beamforming results suggested that grinding dynamics and mill charge shape can be reconstructed from acoustic noise measured at 500 Hz frequency band.
Noise level in main workplaces Workplace Test numbers The highest noise level/dB(A) Crusher room 3 106 Ball mill room 3 101 Packaging machine room 3 85 Air compressor room 3 95 Raw material mill 3 103 Rotary kiln end 3 93 Coal mill room 3 102 Pump room 4 97 ... Shen Lvyuan, Control of the Ballmillhouse in Cement Plant, Noise ...
SmartFill is a new, interferencefree, "electronic mill ear" for measuring the filling level. The filling level is measured directly at the mill body by structureborn sound measurement and the ...
Zhang (2001) studied the fill level by measuring the energy consumption of the mill motor, but the wear of steel balls and the variation of ball load can seriously affect the power value of the mill. Kolacz (1997) proposed a method to measure the fill level by using a strain transducer.
The soft sensing model structure of ball mill load measuring . The Step of Ball Mill Load Detection Used Mill Sound: Step 1: collect the initiative mill sound and the terminated mill of the ball mill; Step 2: Process the mill sound off line; a. To avoid the interference between the initiative mill sound and terminated mill sound at the
Picking up the noise of the mill by measurement instruments has the benefits of fulltime online operation and is more precise and tolerant of unsafe working environments [38].
In these results, the main effects plot for S/N ratio indicates that the balls to powder weight ratio process factor, having (20:1) has the value of SN ratio as () indicating that this process factor has the largest effect on the signaltonoise ratio. Ball mill working capacity with (2 Liters) has the value of SN ratio as () and ...
Get Electronic Ear / Ball Mill Level Indicator in Pune, Maharashtra at best price by Kana Electromechs. Also find Level Indicators price list from verified companies | ID: ... The Electronic Ear is specially developed for control and regulation of Ball Mills, using the grinding sound frequency signal for optimizing the Mill output ...
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Rolf and Vongluekiet (1982) used instrumented ball to measure impact energies in a × m mill, showing that impact frequencies are higher at 55% and 75% critical speed. Gao and Thelen (1994) developed the grinding balls which integrated piezoelectric sensors and dataprocessing electronics to analyze load movement from distributions of ...
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