sag mill ring gear failure

POST-INSPECTION REPORT: FAILURE OF A BULL GEAR

and uneven heating of the ring gear caused it to expand away from the hub, thus permanently misaligning the ring gear with respect to the hub, producing unsatisfactory runout. The same region shows a break in a small weld used to retain a locating pin between the hub and ring gear of the bull gear, although this is on the other face of the gear.

Electrolytic starter (LRS) for high power slipring motors ...

If a power failure occurs during starting, the electrodes return automatically to the start position when the supply is restored, so that a new start is possible. Control panels: The control gear is housed in two separate enclosures. The shorting contactor complete with the rotor terminations are housed in the MV enclosure.

Lrs And Ser For A Sag Mill, Ball Mill - Eurocentrum Bistro

A sag mill with a 44 134m sag mills are primarily used at gold get price and support online sag mill ring gear failure iqsa sag mill pinion gear alignment motor power to the slip ring induction motor for sag mills and induction motor for the sag mill and liquid rheostat starter lrs and slip ring motor for the ball mill.

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, Condor Gold said.

Selecting Inching Drives for Mill and Kiln Applications

more than four gear stages to achieve the required ratio should a six pole mote be used. The size of the motor can be determined by the following formula: where P inch is the incher driver power (HP or kW) N o_inch is the requested ouput speed of the mill gear in inching mode N o_mill is the actual output speed of the mill gear in normal ...

When it Comes to Mining, Bigger is Best | PTE

For example, ring-geared mill drive (RMD) systems are good solutions when the power required to drive the mill is under 18 MW, i.e., a maximum of 9 MW per pinion (Fig. 4). Yet as tube mills grow in size in order to meet the demand for larger throughputs, the …

Mill (grinding) - Wikipedia

SAG mill . SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.

Ball Mill Girth Gear and Pinion Alignment - CR4 Discussion ...

Re: Ball Mill Girth Gear and Pinion Alignment. 08/27/2011 2:07 AM. pinion alighnment is done by coating the pinion with a lead based grease. after rotating the drum, the grease marks will show the contact area. the pinion should contact the girth "ring" near the center of the gears. Login to Reply. TonyS.

Move to Zero Unplanned Downtime - Spartan Controls

operating SAG Mill ring gear. Because this defect only affected one direction, the company operated the mill in the "good" direction until it could be shut down on a planned basis. REDUCE MAINTENANCE COSTS Reduce Spending by Eliminating Maintenance A South American mining company reengineered its processes by investing in Emerson's condition

Global Physical Asset Management | LinkedIn

Global Physical Asset Management | 290 followers on LinkedIn. Third-party girth gear engineering, installation, risk assessments, E2905 inspections, pinion alignments and maintenance | Our third-party capabilities are in the engineering, design, manufacture, installation, inspection and maintenance of large girth gear systems. We provide a complete non …

Tips for MC Eternal : feedthebeast - reddit

1. level 1. IChrisI. · 2y. For food, I'm going with Toast. This may get nerfed, but right now it's great! Wheat goes into a Simple Sag Mill, then cook it twice. If you can get a Thermal Expansion Trivection Chamber going, 1 wheat becomes 4 toast. For storage, I …

Grinding Maintenance Brochure by Workforce South ... -

SAG mill feed size distribution – we work with clients to ensure mill ball to rock ratio and ball size can be compensated to counter lack of coarse breakage in high competency ores, to improve ...

BEARING FAILURE: CAUSES AND CURES

FAILURE Spalled Area Moderately spalled area indicates Fatigue failure-usually referred to as spalling-is the fracture of the running surfaces and subsequent removal of small. discrete particles of material. Spalling can occur on the inner ring, outer ring, or balls. This type of failure is progressive and once initiated will spread as a result

Toromocho – A giant in high-altitude mining

The three gearless mill drive (GMD) systems are the ABB most powerful ever made. The GMD for the 40-foot SAG mill has a power rating of 28 megawatts (MW), and the GMDs for the two 28-foot ball mills have a power rating of 22 MW. They are the largest diameter and most powerful SAG and ball mills drive systems at the highest altitude installed to ...

Paper # 25 - Copper Mountain Overview on the Grinding ...

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

Lube Oil Trunnion Sag Mill

Ball Mill Area Lube Piping lubrication oil cost ball mill, coal mill ring gear pinion vibration sag mill trunnion bearing lube oil trunnion sag mill what coal mill, vertical roller mill, raw mill, ball mill etc what is ball mill lubriion systemOre pulverizer machine Industrial Lubrication Products for Cement Plant Equipment Whitmore manufactures.

Ring-geared mill drives - Grinding | ABB

Mill application features. Frozen charge protection – Detects frozen charge in the mill, minimizing equipment wear and liner replacements.; Coupling supervision – Detects if a failure or slippage occurs in the couplings and stops the system in case, preventing major damages.; Stand-still detection – Prevents the motors from re-starting if the mill is still rocking or moving after a stop ...

ABB Ring-Geared Mill Drives - Power Transmission

of mills and ball mill ap-plications, and are able to cover the power range up to the mechanical limit of the gearbox or the ring gear. The solution provides ad-justable speed for AG and SAG mills, or the opportu-nity to tune the speed of the ball mills for optimal grind-ing and maximum through-put, without the need to

Transforming Mines, and Ore Processing Plants

Similarly, in the ore processing plant, condition monitoring of SAG mills and ball mills is automated with real-time reliability data collection on ring gear and motors. Associated equipment such as the SAG mill water intake valve is also monitored to predict problems early.

Collahuasi sag mill failure - Manufacturer Of High-end ...

sag mill ring gear failure grinding mill china collahuasi sag mill failure arpainternationalin, 911 Metallurgist 17 Mar 2017, used sag mill for copper sale sag mill ring gear failure moinho sag usado batepapo online; monitoramento de condio efffective para o moinho sag. Oline Chat

National Gear Repair‎ - Gearbox Repair, Emergency ...

National. Gear Repairs Inc. We are a specialty precision Re-manufacturing Machine shop, with over 40 years of experience repairing and manufacturing a wide variety of Industrial Equipment such as: Bevel Gear Grinding. Spiral Bevel Gear Grinding. Split Herringbone Gear Grinding. Helical Gear Grinding. Herringbone Gear Grinding.

Girth Gears - More than Just Metal and Teeth - Gear …

Girth Gear Applications Girth gears fall into two basic categories; flange mounted and tangential spring mounted. Flange-mounted girth gears, the more common of the two, are most frequently utilized in "cold" processing equipment such as SAG (semi autogenous grinding) mills and ball mills for use in the mining and cement industries.

Benefits of continuous data acquisition from critical ...

(SAG) and Ball mills. Traditionally moved through a girth gear either with single or dual pinion, there are several ... 2500 kW multi stage gear unit for a ball mill in a silver mine ... system; an oil change avoided further deterioration and earlier failure Figure 8: GMD screenshot and fast speed interface nodes for vibration

Bearing damage and failure analysis

Each failure leaves its own special imprint on the bearing. Consequently, by examining a failed or damaged bearing, it is possible in the major - ity of cases to establish the root cause and define corrective actions to prevent a recur - rence. This publication is intended to provide a basic understanding of bearing failures and failure analy sis.

Double Helical Gear - an overview | ScienceDirect Topics

Gear milling is an economical and flexible process for cutting a variety of cylindrical and other gear types such as spur, helical and bevel gears, racks, splines, and ratchets. In gear milling, circular, disc-type cutters and end-mill cutters are used to cut gear teeth. The shape of the milling cutter conforms to the gear-tooth space.

US8162246B2 - Multiple safety element torque limiter ...

FIG. 1 depicts a low speed crusher mill 10 having a ring gear 12 affixed to its perimeter at one end driven by two pinions 14 on a shaft 16 supporting a pillow block hearings 18. A pair of variable speed AC motors 20 each have an output shaft 22 which each in turn drive an input of a torque limier 24 of a type described herein and in the ...

Literature Review: Gearless Motor Failures – A Mill ...

The origins of the failure can be traced back to c. 1994 when PT Freeport Indonesia ordered its first gearless drive for their 34 ft SAG mill. The motor had to fit through a tunnel on the road to the site. This necessitated a change in the frame design from that used in older motors to allow clearance in the tunnel [8].

Care and Maintenance of Bearings - NTN Global

6 Table 3.5 Selection Guide For Lubrication Oil Viscosity dn value : [ dn = d (bearing bore diameter [mm]) × n (operating rotational speed [min-1]) Note 1. The table above is applicable to oil bath lubrication and recirculation lubrication.

ABB Library - Gearless Mill Drives

Paper held at SAG Conference 2011 - By S. Gaulocher (ABB), K.S. Stadler (ABB), Th. von Hoff (ABB), R. Veldsman (ABB), A. Fuerst (ABB) and J. Koponen (ABB): Gearless mill drives (GMDs) are the workhorse in the mineral processing industries, more specifically when it comes to grinding crushed ore and cement (in various production stages) in semiautogenous (SAG) …

Machinery Failure - Gilmore Engineers Pty Ltd

A gold mining company contracted Gilmore Engineers to review a mill girth gear failure and the numerous reports that had previously been written regarding its repair. Gilmore Engineers produced a management-level report analysing the failure and providing a recommendation for the potential remaining life of the gear.

Update On JHEP SAG Mill Drive Selection | PDF | Gear ...

In short, it is a very clear that a SAG mill ring gear designed for 22.5MW in AGMA 321.05 is more than sufficient for 24MW in AGMA 6014/6114. The cost savings resulted from the revision of standards, averages to a more than 5% per a set of gears. Girth Gear improvements in casting techniques and materials

FATIGUE FAILURE AND TESTING METHODS

Fatigue Failure and Testing Methods 5 2.2 Different phases of fatigue life Microscopic investigation in the 20th century has revealed that the nucleation of fatigue cracks occurs at a very early stage of fatigue life.

Elastomer Engineering Guide - James Walker

Elastomer failure modes 33. 4 Introduction to elastomer engineering Introduction to elastomer engineering This guide has been produced by ... Figure 9: Cross-section of an 'O' ring showing (a) initial sealing force and (b) the increase in sealing force due to system pressure.