Gearbox Typical Failure Modes, Detection and Mitigation ...
Damage Records Bearings . Gears : Others : Planetary ; 44 ; 23 . 21 ; IMS . N/A ; 34 . 9 ; 47 . HSS ; N/A . 123 ; Total . 257 ; 180 . 68 ; 9 . Typical Failure Modes . 7 A Representative Configuration . 7 Annulus Planet Sun Gear Gear Pinion Pinion Low-Speed Stage High-Speed Stage Intermediate-Speed Stage Low-Speed Shaft Intermediate-Speed Shaft ...
SAG mill Archives - International Mining
The SAG mill agreement has come about as First Majestic ordered a complete new SAG mill package, which, Condor says, is now superfluous to its requirements. The SAG mill has a mill diameter of 24 ft (7.3 m) and an effective grinding length of 18.5 ft and a structural charge mass of 315 t, …
The Magazine - Siemens
rated speed of the SAG mill motors so that the four large Flender gears all work with the same transmission ratio, both mill types can operate with the same gear size and design. This reduces capital investment for the mechan-ical drives by 17% and spare parts costs by up to 50%. The SAG mill is driven by two 7,500-kW, air-cooled asynchronous
Detection of Pillow Block Bearings Defect Using Infrared ...
2.SAG mill Golgohar mineral and industrial company has three processing line of iron ore concentrate and there is a semi-auto genius mill (dry mill) with power 3 Mw in each one. These mills are categorized as vital equipment and any problem of them could lead to processing line down time. Figure 1 shows Schematic view of dry mill.
Gearless mill drives - ABB
• 28 MW GMD for a 40' SAG mill • 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 positioned to contribute to the building of larger and ever more powerful mills. — Leading the gearless mill drive evolution The ABB gearless mill drive (GMD) is the most powerful ...
Double Helical Gear - an overview | ScienceDirect Topics
A gearless drive SAG mill, 12 m diameter and 6.1 m length (belly inside liners) with a motor power of more than 20 MW, went into operation at Newcrest Mining's Cadia Hill gold and copper mine in Australia, with a throughput of over 2,000 t h −1 (Dunne et al., 2001).
ENGINEERING STANDARD SPECIFICATION Ontario
Clarabelle Mill SAG, Rod & Ball Mill Pinion Gear Thermal Acceptance Criteria General Industry Acceptance Guidelines for this size and gearset is as follows:* A. 25 degree Celsius differential across the teeth of the pinion face will most likely result in premature wear and …
Cadia Girth Gear Failures
The gears and pinions on the Cadia ball mill gears failed due to a design fault. We agree with [2] that a larger pinion may have avoided the gear scoring, however, the location of the damage can only be explained by thermal ratcheting resulting in differential expansion. The damage to both the loaded and unloaded flanks of the girth gear are ...
Grinding Mill Gear Assembly - Mineral Processing & …
By mill we refer to Ball Mills, Rod Mills and SAG Mills. Anything gear and pinion really. The discharge end of the mill; For the operator this only becomes a problem should the bolts that hold the liners in begin to leak water and ground rock. This combination is called SLURRY.
Paper # 25 - Copper Mountain Overview on the Grinding ...
The grinding circuit consists of a SAG mill and two ball mills, all dual pinion gear driven. Copper . 3 Mountain has selected the state-of-the-art dual pinion mill drive systems, providing numerous ... a short circuit on the motor terminals that could cause severe damage to the gear, pinions, bearings and mill.
SAG Mill | Autogenous and Semi-Autogenous Mills | FL
Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size …
Mining Weekly - Leading in grinding mill technology
Discussing this new range of products, Calver explains that the Impactmeter (patent pending) is an acoustical instrument developed for the purpose of monitoring impacts inside a …
1 - Maintenance
Basically they support equipments like motor, reducer gears, pinion drive blocks and mills with girth gears. A portion of Sag mill foundation is a wall almost 10m x 2m x 8.2m in height. It is coupled with mill foundation system consisting of four wall columns braced by …
TECHNICAL How to Spec a Mill Gear - Power Transmission
the mill builder can provide the gear designer with input power and output speed. The next step is the interface dimen-sions. Since the gear needs to turn the mill, it needs to have a bore larger than the mill outside diameter. The mill out-side diameter is a function …
Sag Mill Syncronis Motor high axial vibration non drive ...
The Pinion drives the Mill through a large girth gear. The pinion has 21 teeth and the girth gear has 376 teeth. ... Re install locking device or a new one if any sign of damage Set motor rotor on mag center and set the locking device ... When the Sag Mill was in operation the clutch operation just did not look ok and pad wear was uneven.
The Effect of Start-Up Load Conditions on Gearbox ...
The location of the damage observed on the low-speed pinion (Fig. 7) corresponds to the damage observed on its mating gear. However, the level of damage on the low-speed pinion is much more se vere than that on the mating, low-speed gear. Since the pinion sees many more cycles than the gear, the disparity in the level of damage is expected.
Ball Mill Explained - saVRee
Multiple stages may include a rod mill followed by a ball mill (two stage circuit), or a semi-autogenous grinding (SAG) mill followed by a ball mill (two stage circuit). Smaller plants tend to add extra crushing stages in order to operate a single grinding stage only. If a ball mill uses little or no water during grinding, it …
reasons for ball mill bearings failure
Overview on the grinding mills and their dual pinion mill drives mill and two 24' x 39.5' ball mills will be briefly discussed. .... on the motor terminals that could cause severe damage to the gear, pinions, ... A SAG Mill Control: ...
Successful Design of the NICO Grinding Circuit for ...
And whether the total pinion energy (SAG plus ball mill) was sorted by increasing SAG, or by increasing total pinion energy, the result was the same. Taking design numbers from this analysis shows that to grind to a T80 of 1.7mm (from 152mm F80) in a SAG mill will require 29.5 kWh/t in the SAG mill. When ball mill grinding is added,
crown pinion alignment ball mills - SRE Machineries
Align Ball Mill Pinion Gears Vetura Mining machine. Ball Mill Pinion Alignment Sugar Smith Cakes May 10 2017 align ball mill pinion gears as a leading global manufacturer of crushing grinding and mining equipments we offer advanced reasonable solutions for any size get price cement mill alignment 10 may 2017 cr4 thread ball mill girth gear and pinion with all due respect the way to perform ...
Smooth Operators
The clutch's primary role on the dual-pinion, direct-drive geared mill is to provide smooth starts during mill startup. When the mill is running, the clutch also serves as a torque "circuit breaker," reducing costly repairs and downtime by protecting the pinions and ring gear from potential damage caused by large pieces of grinding material.
Horsburgh & Scott Gear Up
Horsburgh & Scott identified an input worm gear pinion and worm gear that were out of alignment during operation. Horsburgh & Scott's Field Service Team performed a tear down of the input pinion to identify the root cause of failure. They determined the root cause was …
GIRTH GEAR - artec-machine.com
Elastic mill sag by weight of mill balls and materia! to grind A: After temporary alignment of the teeth of pinion and girth gear with the mill empty, Fig. 8a, re-alignment should be undertaken with the mill filled with mill balls, i. e. with reference to the elastic sag in cold con- dition, Fig. 8b.
How to do weekly predictive maintenance on gears to ...
Stop action photographs girth gear photographs are an excellent predictive maintenance task that every site can employ without shutting down critical mills, kilns, or dryers. When taken at regular weekly intervals, changes in mill set operation and condition can quickly be identified. What failure modes can I detect with this method? Misalignment Wear Macropitting Scuffing […]
SAG Mill Grinding Circuit Design - 911metallurgist.com
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 …
Purchase of New SAG Mill from First Majestic Silver Corp
Details of the complete SAG Mill package. The SAG Mill has a mill diameter of 24 feet and an Effective Grinding Length ("EGL) of 18.5 feet and a structural charge mass of 315 metric tonnes. The structural design ball charge is 11% with a structural design load volume of 35%. Specific gravity of the material is 2.55.
Smooth Operators: Wichita multi-plate clutch technology
High-speed motor > gear reducer > clutch > pinion Due to their respective functionality, ball and SAG mills each have different torque overload requirements. For example, the torque overload capacity requirement for a ball mill is 200%. A SAG mill requirement might be 225-250% torque based on Full Load Motor Torque (FLMT).
Electromechanical Dynamic Behaviour and Start-Up ...
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.
What's the Difference Between Ball Mill, Rod Mill and SAG ...
consist of a crusher followed by a SAG mill followed by a ball mill. In this context, the SAG ... rod gates and rack and pinion gates is provided before screens to permit ... dependent material damage mechanism such as fatigue, corrosion, erosion, etc. 453
What is the purpose of crushing, grinding and milling ...
Answer: The purpose is to break the valuable mineral grains free of the gangue minerals, so that they can be physically separated from each other. This makes it possible to produce a pure mineral concentrate using processes like froth flotation or magnetic separation. So if an ore consists of gra...
Published Online August 2021 in IJEAST ( ...
SAG mill is a self-grinding machine which uses the crushed material inside the cylinder as the grinding medium. The material constantly ... significant importance in order to avoid major damage to the mill shell, bearings and liners. As the loaded mill starts up, as ... girth gear/pinion shown in fig 1.2 as (a)). 2. A variable-speed drive (VSD ...
INTELLIGENT GEARING SYSTEM – SOLUTION TO …
The mill drive system consists of the main mill motor, the main reduction gear box, mill pinion and girth gear. The mill is also equipped with a barring drive which is either connected to the main drive reduction unit or alternatively mounted at the back of the main motor. Refer to Figure 2 …
Mill drives: the desire for increased power and the ...
design mill speed, and the maximum design ball charge volume (Barratt, 1989). For single pinion and dual pinion drives, with 21 MW now a distinct possibility, the probability of pinion changes to a higher mill speed should always be considered when set-ting …
Grinding Mills - an overview | ScienceDirect Topics
SAG mill product feeds two parallel ball mills of 6.6 m×11.1 m (internal diameter×length), each with a 9.7 MW twin pinion drive. The ball mills are operated at a ball charge volume of 30–32% and 78.5% critical speed. The SAG mill trommel undersize is combined with the ball mills' discharge and pumped to two parallel packs (clusters) of ...
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