Copper Mountain Overview on the Grinding Mills and …
The grinding process with one 34' x 20' SAG mill and two 24' x 39.5' ball mills will be briefly discussed. All three mills are gear driven by a ring gear, dual pinion and two low speed synchronous motors. Copper Mountain has installed on all three mills, the new state-of-the art dual pinion mill drives.
Impact on Grinding Mill Design of Recent New Discoveries
Database Soft Ore Hard Ore. The new discoveries therefore include the wide variance in SAG mill pinion energy from 2 to 34 kWh/t for constant measured Bond …
SAGDesign Case Studies
SAG and Ball mill tests and results in the obvious situation where: 1) SAG pinion energy + Ball Mill pinion energy = Total Grinding pinion energy By measuring these two components which can be called coarse and fine grinding parameters, the total grinding pinion energy can be determined. But this is only part of the story.
Gearless mill drives
The gearless mill drive eliminates ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings, used within a conventional mill drive ... • 28 MW GMD for 42' SAG mill Whether it is size or an installation at the highest altitude (4600 m.a.s.l.), ABB's GMDs are well ... possibility of the catastrophic inter-turn failure by default ...
How to install and align the girth gear and pinion | prmdrive
The cost of edge drive is low, but the pinion needs to be replaced every 2-5 years. Edge drive is mainly used in coal mills and mills with small power. The girth gear(big ring gear) and pinion are the key of the edge transmission device. Their reliable operation is directly related to the stable production of the mill.
Ball mill/SAG mill drive lubrication system | IEEE …
This paper describes the function and operation of lubrication systems for Ball Mill and SAG Mill Drives. Provided within this paper are hydraulic schematics, functional description and a general overview of system layout as well as some of the important features and factors relevant to improving the reliability of this very critical part …
Girth Gear Inspections
Utilizing our program can dramatically minimize the chance of failures like this. Benefits of E2905. Fast Turnaround: The total time to clean & inspect a large 40' SAG mill gear is under 8 hours.
SAGDesign Test
The SAG mill pinion energy, W SDT (kWh/t) and SAG discharge Bond ball mill work index, S d-BWI (kWh/t), are then used to calculate the total energy to grind the ore from 80% passing 152 mm to 80% passing the client specified final product size P 80.This information, along with the ore specific gravity, is used to calculate necessary mill sizes …
Grinding Mill Foundations
The failure was traced to the gear forces as these matched one of the natural frequencies of the foundation piers. ... Again wrong. The El Teniente SAG mill foundations had to be stiffened as did the stator frame to ensure there would be no vibration because the soil properties were very poor. ... mill and pinion rotation and liner loads. …
Ball Mill Maintenance & Installation Procedure
The mill gear should be lifted by the pinion causing a downward pressure on the pinion shaft bearing. Mills are made either right or left "hand". There are two methods of identifying the "hand" of the mill. When standing at the feed end of the mill, and facing the mill, if the mill rotates clockwise, it is a right hand mill. ...
Minding the Grind: Maintenance Options to Keep SAG Mills …
• Structural failure of mill components. "A grinding mill goes through considerable rotations in one year and fatigue cracks can develop over time. If undetected, these cracks will …
Cadia Girth Gear Failures
This is an update of work presented at the SAG 2001 conference on the Cadia gears [1]. Both gears and pinions on twin ball mills failed almost simultaneously. Our 2001 paper showed that the …
sag mill pinion failure modes
Jun 19, 2020 Mill Pinion Failure Modes. Grinding mill failure modes the role of milling cutter or the mill is the most critical aspect that determines the out coming failure mode is reviewed and the potential effects of the failure should it occur are identified for some of the failure modes there are only one effect while for other modes ...
STEPPING FORWARD: USING VARIABLE SPEED …
developed for single pinion or dual pinion applications depending on the power of the driven mill. High speed solution. Typically, a high speed squirrel cage motor with three or …
SAGDesign Case Studies
SAG and Ball mill tests and results in the obvious situation where: 1) SAG pinion energy + Ball Mill pinion energy = Total Grinding pinion energy By measuring …
What Happens When a Pinion Bearing Goes Bad?
Continued operation with a bad pinion bearing poses serious risks of extensive damage to the mill's critical components. The excessive friction and misalignment caused by the faulty bearing can result in premature wear of the pinion gear and the girth gear. This, in turn, can lead to costly repairs and downtime for the mill.
Impact on Grinding Mill Design of Recent New Discoveries
The graph of SAG pinion energy (to 1.7mm) Vs Bond BM Wi is given in Figure 3. Excluding the very soft and very hard projects, shows that the database in general does support a broad correlation between SAG and ball mill hardness but that the function is -defined to be useful in sizing a SAG too ill mill from a Bond BM Wi measurement.
Paper # 25
The grinding process with one 34' x 20' SAG mill and two 24' x 39.5' ball mills will be briefly discussed. All three mills are gear driven by a ring gear, dual pinion and two low speed synchronous motors. Copper Mountain has installed on all three mills, the new state-of-the art dual pinion mill drives.
SAG Mill | Autogenous and Semi-Autogenous Mills
Get more done at a lower cost with higher throughput. Easily find the perfect fit from our wide range of sizes. Depend on years of proven reliability and productivity. Products. Maximise the productivity of your operation with durable high-efficiency Semi Autogenous Mill (SAG mill) and Autogenous Mill (AG Mill).
Gears and pinions
issues before they turn into real problems Your challenge: Issues with pinion teeth can be hard to spot. Even worse, when left uncorrected, they can cause permanent damage to …
Drive Solutions for the Global Mining Industry
drive application is a dual-pinion SAG mill driven by two 5,000 kW wound rotor induction motors (WRIM). Two TMdrive-10SPRs control motor speed by recovering rotor current and returning the power to the utility supply. Confi gured in a twin motor arrangement, the motors share load in the tandem mill. The Customer Need
Girth Gear Inspections
The total time to clean & inspect a large 40' SAG mill gear is under 8 hours. Girth Gear Specialist Team includes an gear engineering specialist who conducts gear inspections based and on the inspection …
AG
Power drawn at the pinion is 448 kW, 13.617 kWh/tonne (SAG mill) and 570 kW, 17.325 kWh/tonne (ball mill) when processing 32.9 mtph, for a total of 30.942 kWh/tonne or 14.6% above the conventional estimate. A ball charge volume which is lower than those tested has been selected in order to minimize wear. Obviously, the SAG mill …
Non-destructive Testing of Cement Plant Mills, …
Non-destructive Testing of Cement Plant Pinion and Bull Gears. Cement mill pinion and bull gears are high torque and fatigue applications. Over time bending fatigue and/or contact fatigue will initiate …
TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS …
general, the bigger the mill diameter, the lower are the mill operating and critical speeds. Thus, for larger mills the number of poles will increase. As a result, the number of poles can vary from 48 to 72 poles (Fig. 3.) with typical mill speed requirements of about 10 rpm for larger SAG mills and about 15 rpm for smaller ball mills. Figure 3.
Tribological failure analysis of journal bearings used in sugar mills
Background. In the current article the problem related to the failure (as shown in Fig. 2) of journal bearing in a sugar mill installation has been analyzed. The length and diameter of these bearings are 675 mm and 530 mm respectively. The material of the bearing is solid tin bronze (Cu 84%, Sn 10%, Pb 3%, Zn 3%; Grade LTB-1 of IS 318).
Inching drives – one way to improve mill safety
Ignoring mechanical losses in this drive train, the power transmission at each stage, defined as torque x speed, is constant. The typical mechanical inching drive motor speed is around 1500 to 1800 …
Sag Mill Pinion Failure Modes
The Failure and ball mill journal bearing ball mill failure modes pdf ball mill pinion failure in south Get Price And Support Online A Publication of the Lubrication Engineers Technical if a ball mill or SAG mill is out of operation for one hour at a Chilean Copper Mine it costs the mine 200000 or 300000 failure …
5 8 2016 SAG Mill Inspection | PDF
5 8 2016 SAG Mill Inspection - Free download as Word Doc (.doc), PDF File (.pdf), Text File (.txt) or read online for free. reyreh
Ball Mill Pinion Failure
Root cause analysis of bowlmill pinion shaft failures This article describes in detail the approach and root cause for failure of pinion shafts used in bowl
