vibration and plant operating data such as flow, temperature, or pressure. Continuous monitoring detects the onset of component problems in advance, which means that maintenance is performed only when needed. With this type of approach, unplanned downtime is reduced or eliminated and the risk of catastrophic failure is mitigated.
vibration and plant operating data such as flow, temperature, or pressure. Continuous monitoring detects the onset of component problems in advance, which means that maintenance is performed only when needed. With this type of approach, unplanned downtime is reduced or eliminated and the risk of catastrophic failure is mitigated.
I suppose its best to start at the beginning and talk about the basics of controlling a SAG mill. We have all become accustomed to using bearing pressure and power to control a SAG mill (adjusting ...
Choosing vibration monitoring methods. Grinding mill finds continuous online surveillance of vibration to be cost-effective after conversion from offline system. SEMIAUTOGENOUS GRINDING mills, also known simply as SAG mills, grind materials from large chunks into small, usable pieces for processing. The ones used in mining operations in Canada ...
Thus, with condition monitoring of the SAG mill behaviors employing vibration, acoustic and thermal signals, the relevant parameter can be diagnosed and monitored. Accordingly, the mill may work on its optimum conditions without the concern of any imminent problem like mill congestions and unplanned stops.
the work done by the AG/SAG mill (right graph). This figure is quite diagnostic of the problem discussed in this paper. It shows that the actual AG/SAG operating work index can be significantly biased, particularly for coarse transfer sizes. This result has led to misconceptions and terms such as "SAG mill inefficiency factor."
The vibration issue was controlled by site maintenance and the vendor without any significant loss of availability until the strongback stiffener could be applied. The cracked rotor poles did not result in any damage to the windings again due to good maintenance.
Once the oil was changed, the vibration did not increase any further. The mill has been in operation one year since the lubrication problem was detected at an early stage Case 2) asset analytics system installed to overlook two (2) GMDs of 38 feet (~11.6 m) diameter SAG mill drives; in a remote location, recording simultaneously data of relevant
surface of the mill. Vibrations are generated by collisions between grinding media, ore particles and the mill body. Changes to the vibration signal can indicate changes in charge characteristics...
Vibration Analysis. A scientific approach to obtaining detailed information about the health of your rotating equipment. Equipment failure as a result of excessive vibration may not only leave you with expensive repairs but can also greatly increase the safety risks to personnel.
Chatter is a problem that every CNC machine operator must deal with from time to time. Machining vibration is a common problem in CNC manufacturing. Milling, turning or drilling will all cause parts to suffer this torture. It affects the quality and efficiency of processing, will cause the finish of the parts to decrease, and will damage and significantly shorten the life …
Grinding is often finished with a ball mill, which differs from a SAG mill, as it relies on the steel alone for grinding. A SAG mill may have 10% steel where a ball mill will typically have 30%. Classification is normally carried out in hydro cyclones with the product feeding either a flotation or leach circuit.
Vibration readings taken at mill HP pump running at various RPM, The vibration level was less and almost 8mm/sec to 9mm/sec when the pump was running at 900 rpm, so it is advisable to run the pump at 900 rpm to have minimum vibration in the SAG Mill. Conclusion:
SAG Mill Ball Charge The SAG mill was simulated to require a 10-12% ball charge with a top size of 125mm. During the commissioning phase no balls were required to be added to the SAG mill to achieve the target throughput of 575tph. This allows for great flexibility in the future and significant security for the future. Ball Mill Power
Castro and Valenzuela [2, 3] studied the electromechanical coupling model of a SAG mill. The simulation results were compared with the field record data during start-up and shutdown of the SAG mill. Guerrero and Pontt investigated the oscillatory torque caused by dead time in the current control of a high-power gearless mill drive.
In most cases, the main symptom of grout and foundation problems is high vibration levels of the machine itself, particularly when the trend is upward.
I work in an industrial copper company as vibration analysis supervisor. This company started to work about 2 years ago. We have two Ball Mills and one Sag Mill. We had some visual inspection on pinion and ring gears, during these inspections we found some abnormal wear on this gears (pictures show this problem in enclosure).
As I explained before, mill sound in a SAG mill may depend either on mill speed or mill filling. We did develop an instrument called "impact meter", which has been marketed by FL. The device is intended to recognize the specific sound pattern of balls hitting mill liners, in order to avoid such operating condition.
vibration and acoustical signals have been one of the mainly indirect methods to measure these load parameters [3]. Many researches have been done on wet ball mill [4], dry ball mill [5] and SAG mill [6]. However, most of the above methods used the extract and select features from frequency spectrum obtained by traditional Fast Fourier
As a result, under-sizing an SAG mill has disastrous results on throughput— across the industry, there are numerous examples of the SAG mill emerging as the circuit bottleneck. On the other hand, over-sizing an SAG circuit can be a poor utilization of capital (or an opportunity for future expansion!).
In later projects at Cadia, we strain gauged the 40 ft SAG mill to determine stress ranges and also the drives of the two ball mills to determine torsional vibration amplitudes as part of a long-term study of the mill drives. Cadia was undoubtedly the most significant project we …
maintaining normal production numbers at Gold Corp Peñasquito on two 2265 TPH SAG mills. Additional vibration sensors were also positioned at fixed points on the inlet and discharge ends of the mill to yield two real-time volumetric fill levels along with another fill level measurement taken from the mill shell.
When the Sag Mill was in operation the clutch operation just did not look ok and pad wear was uneven. The clutch was changed with a used clutch and the results were significant. The axial vibration on the Sag NDE bearing axial plane reduced from 30mm/sec rms to under 2mm/sec rms. The motor vibration is now satisfactory in all planes.
SAG Mill Bearings Design With Trunnion Deformation RBTS takes an integrated approach to problem solving, analyzing the entire project to determine the ... elusive vibration problem in a large industrial rotating machine, to the development of miniature pump rotating
The Ernest Henry SAG mill (11 MW) is currently the largest twin pinion single drive mill installed in Australia. Problems have been experienced with the twin pinion drive at Fimiston and with the ring motor at Cadia. At Cadia, excessive vibration and deflections in the drive stator were encountered during
Beyond conveyors, continuous condition monitoring can improve performance for electric shovels, chute automation, SAG and ball mill automation, and mill circuit isolation. For electric shovels, Industrial Internet of Things (IIoT)-based wireless vibration sensors detect problems in transmission, motor unbalance, bearing failure and in propel ...
Periodic vibration routes for a large number of plants with practically no breakdowns, and therefore, no unforeseen losses. Minimum return on investment of 3 to 1 with the implementation of a vibration analysis program. Diagnoses of vibration problems on refiners, turbines, blowers, compressors, pumps, presses, etc.
I'm on a mining industry. we're having excessive vibration on the discharge end of our trunnion sag mill bearing. we already ask help for some expert and we are just done on relining the mill, we already check-up bearing clearances and bearing as a whole but still to no avail. we already try to reduce the rpm of the mill but nothing happened. anyone who had …
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