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).

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.

SAG mill and how the vibration response and hence mill operating conditions vary as a function of time, including during mill equipment failures such as a broken discharge grate. Opportunities for improved mill control based on the data from the on-line monitor are also discussed, as well as the implications in terms of mill processing and ...

I once had a very similar problem in a ball mill that was almost identical in drive line and support configuration. This machine had a dominant 10.4cps. Being such a large piece of equipment the vibration transmitted through the drive line and foundations and could be seen shaking nearby walkway handrails.

Vibration under these conditions is a natural consequence as explained in the information under the paragraph entitled "Starting the Mill". No. 2 – EXCESSIVE TEMPERATURE OF TRUNNION BEARING. Cause A – GROUT …

vibration problems. Finally this package began to work well in a pilot scale (0.42 X 0.63 m) mill. A number of experiments were conducted to test the robustness and accuracy of the package. The net result is that the package performs very well. Currently we are building the package that would fit on the 1.75 inch lifter bolt of the Cortez SAG mill.

Elimination of material transport problems using TPL will bring the following process benefits: • Ensure good grinding conditions with lower grinding energy per tonne. • Can be easily retro-fitted to existing mills. The optimal performance of AG/SAG mills is the key to successful plant operation.

I've got to explain this a little bit. This flowsheet is typical of lines 1 and 3. The SAG mill has a trommel on the discharge end of it. Oversize is returned to the mill by a bucket wheel and water jet. Trommel undersize was pumped to a vibrating screen where the screen oversize was sent back to the mill and the undersize was pumped to the ...

SAG mill complete foundation repair service Mining "The grinding mill is at the heart of a mining operation, but a poorly designed, constructed, or deteriorated foundation will not only affect grinding mill performance but potentially render the mill out of action, costing millions of dollars in lost production."

I have direct experience of a SAG mill with conflicting frequencies causing resonance and vibration problems. I have also heard of many other other operations with similar issues. Once built these are incredibly difficult and expensive to rectify.

Surface vibration (acoustic emissions) monitoring is a noninvasive low-cost means of monitoring normally inaccessible attributes of processes or equipment operation. The current investigation monitors vibrations in a SAG mill by an accelerometer attached to the outside of the rotating shell.

MillSlicer has been developed for the mining industry, specifically for use on SAG/AG mills. The MillSlicer utilises vibration sensors and digital signal processing technology to provides information about the inlet and outlet conditions, and …

At our mine we have an issue with vibration at the Sag Motor NDE bearing. The bearing is a journal white metal bearing. The motor has been running for about 14 months now. The vibration at the NDE bearing was around 2mm/sec. In the last month it has...

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

Vibration Sag Mill Motor NDE Bearing. At our mine we have an issue with vibration at the Sag Motor NDE bearing. The bearing is a journal white metal bearing. The motor has been running for about 14 months now. The vibration at the NDE …

The Collahuasi motor was for a 40 ft SAG mill. The Antamina 38 ft SAG mill was also driven by an ABB motor and the hanger plates had not failed on that machine after several years of operation. Similarly, the Sossego motor for the 38 ft SAG mill had not failed. It too had an ABB motor and it had operated longer than the Collahuasi motor.

Autogenous grinding is favored when the ore is quite competent and a fine grind is required. Semi-autogenous grinding is applied when fine crushing could cause severe problems or when ore is variable in hardness or …

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:

Influence of filling level on material movement behavior in SAG mill is analyzed. • Influence of filling level on grinding performance is analyzed with collision energy. • Influences of filling level on liner and grinding media wear are analyzed. • The vibration of mill is discussed based on the collision energy on liner.

Online Vibration Monitoring System Improves Fault Detection in a SAG Mill. A copper mine site already had an extensive condition monitoring program in place. We went through their oil analysis reports regularly, sitting down with …

operation of SAG mills. SAG mills are currently the technology of choice in hard rock milling operations for reducing primary-crushed ore to ball mill feed. In recent years, the trend has been towards larger-sized SAG mills with diameters of 10.4 m (34 ft) and above, with the largest being 12.2 m (40 ft) in

The process state of an AG/SAG mill can be inferred from surface vibration monitoring. This is a passive, non-intrusive, low cost and reliable hardware …

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.

Vibrations On Tube Ball Mill Pinion Gear Bearings. An Experimental Analysis Of Vibration Of A. a large cylindrical shell which ends with inlet and outlet tubes that are supported in journal bearings The drive of the ball mill consists of an induction electric motor twostage gearbox and the pinion gear This pinion gear is mated with the girth gear mounted on circumference of …

Specific surface vibration 'features' have also been used to predict AG/SAG mill global process and performance variables such as mill load, …

operation of SAG mills. SAG mills are currently the technology of choice in hard rock milling operations for reducing primary-crushed ore to ball mill feed. In recent years, the trend has been towards larger-sized SAG mills with diameters of 10.4 m (34 ft) and above, with the largest being 12.2 m (40 ft) in

OPTIMAL SAG MILL CONTROL USING VIBRATION & DIGITAL SIGNAL PROCESSING TECHNIQUES ABSTRACT Recent developments in low power wireless and Digital Signal Processing (DSP) technologies have given rise to a new system that can monitor vibrations in real-time on the rotating surface of SAG, AG, and Ball mills.