In general use, few applications of gear drives in industrial applications are selected on the basis of service factors. Normally service factors are, or greater. Mill drive inchers can use this low value of service factor based on the limited operation over the twenty five year expected life. Regular inspections of the gear drive,
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World's largest geared drive 2x8500kW Wushan, China (operating) Among the many reasons that geared drives on large SAG mills are not favoured, is due to not having an efficient variable speed drive option (60 to 80% critical speed), which is required for process reasons. ... and variable frequency drive technology on twin pinion drive ...
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Until now, geardriven solutions for large SAG and ball mills have been limited to 18 MW. In the past, grinding mills operating between 18 MW and 28 MW required a large electrical wraparound motor, known as a Gearless Mill Drive (GMD). The QdX4 system has been developed as an alternative to GMDs.
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Approx. relative cost Gearless Drive Highest 150% Variable Speed Low Speed Sync 130% Fixed Speed Low Speed Sync 125% Variable Speed High Speed Asyn 115% (VSI) Variable Speed High Speed Asyn 110% (SER) Fixed Speed High Speed Asyn Lowest 100% (LRS) 20 MW Variable Speed SAG Mill SAG MILL VARIABLE TWIN PINION DRIVE GMD WRIM/SER SYN SCIM ...
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Figure 1 Top view of SAG mills with alternative drive options; left side: dual pinion drive including motor, gearbox, pinion and girth gear; right side: gearless ring motor What's the benefit? The following benefits are achieved when using gearless drive solutions compared to conventional drive systems (Sehl Dirscherl, 2012):
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The grinding process with one 34' x 20' SAG mill and two 24' x ' 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 stateofthe art dual pinion mill drives.
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· When mill power is between 18 and 20 MW, which is the current manufacturing limit of ring geared mills [2], either a gearless mill drive (GMD) or a ring geared mill with dual pinion motors can be chosen. Selecting between gearless or ring geared design is mostly dependent on size of the mill and power and speed requirements [3].
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and variablespeed drives, two gearless mill drives, two 2×5 MW dual pinion drive systems, four per manentmagnet motors, 23 distribution transformers, gasinsulated switchgear, a harmonic filter system, the extended process control System 800xA and of course a comprehensive service contract 1.
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If the mill requires approximately 6000 horsepower or less, it is possible to drive it with a single pinion. To date, however, economics has dictated that most mills over 3500 horsepower be driven with two pinions, using wound rotor motors driving thru speed reducers.
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Contribute to dinglei2022/en development by creating an account on GitHub.
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Operating at speeds as low as 175 whose solution comprises a MW gearless rpm, with the motors driving the pinions directly mill drive (GMD) for the SAG mill, and two 13 and no gearboxes required, these innovative MW lowspeed dualpinion ringgeared mill solutions minimise mechanical wear on the drive (RMD) systems for the ball mills. mills.
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2 Metso d4 TM Mill Drivesystem 7 MW 7 MW 14 MW 28 MW 7 MW 4 MW 7 MW 7 MW 7 MW 4 MW 7 MW 7 MW SAG mill 32 ft. single drive The natural progression in gear/pinion mill drives: The Metso QdX4TM Mill Drive provides the next step in the evolution of change in mill drive architecture, while allowing the system to be built with components that are within current manufacturing capabilities.
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1 An installed and commissioned 2 × 5 MW dualpinion ringgeared pebble mill In dualpinion mills,the system is driven by more than one motor, which are mechanically coupled to each other to ensure load sharing. ... (SAG)2 mill drives, but not necessarily for ball and pebble mills. A significant number of large SAG and ball mills
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ABB has successfully commissioned three variablespeed mill drive systems at Thompson Creek Metals' Mount Milligan copper/gold mine in Canada. ABB's delivery included one gearless mill drive system (GMD) for a 40ft semiautogenous (SAG) mill and two lowspeed dual pinion ringgeared mill drive systems (RMDs) for two 26ft ball mills; making Mount Milligan's grinding circuit one of the ...
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Singlepinion and dualpinion fixedspeed gear drives offer a relatively simple design. However, process flexibility and optimization can only be achieved with variable speed drives. Furthermore, mechanical problems and maintenance for gearboxes increase operating cost and reduce availability of ball and SAG mills.
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Pairs of Twiflex VKSDFL brakes (with pedestals) for installation on a 24 ft. dia. dualpinion, directdrive geared ball mill at a copper/gold mine in Canada. The VKSDFL (floating) calipers act on a brake disc fitted to a torque limiter. The brakes provide 454 kNm on the mill's highspeed shaft.
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Update on JHEP SAG mill. drive selection Dual pinion versus Gearless in view of changes to AGMA standards Selection concerns Gear design improvements leading to increased tolerances to Hertz ... In short, it is a very clear that a SAG mill ring gear designed for in AGMA is more than sufficient for 24MW in AGMA 6014/6114.
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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 four pole pairs is used for this kind of configuration. A gearbox is needed in this solution, where the high speed side is connected to the motor,
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The gearless mill drive eliminates ringgear, pinion, gearbox, coupling, motor shaft and motor bearings, used within a conventional mill drive system. By mounting the rotor poles directly onto ... • 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
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We provide optimized mill drive solutions for all types of ringgeared mills: low and high speed, single and dual pinion, with and without a gearbox — all designed for reliable, long life and low maintenance operation. Video explaining ABB ring geared mill drive technology eBook: Grinding transformation
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Sag Mill Ring Gear Failure Grinding Mill China. SAG mill, ball mill, ring gear, dual pinion, drive systems, variable speed The grinding circuit consists of a SAG mill and two ball mills, all dual pinion gear driven. Processingmaterial: Bentonite,construction waste,River Stone,coal. Capacity: T/H. Finished product fineness: 10mm,1020mm,20 ...
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Fire Hjul AS Company Profile | SANDEFJORD, VESTFOLD OG TELEMARK, Norway | Competitors, Financials Contacts Dun Bradstreet
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1 x MW gearless mill drive system (GMD) to power the 40 ft SAG mill ; 2 x 13 MW lowspeed dual pinion ringgeared mill drive systems (RMD) to power the plant's 26 ft ball mills; Both drive solutions share many common operation and maintenance features such as frozen charge protection, frozen charge remover, controlled rollback, automatic ...
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SAG mill 32 ft. single drive The natural progression in gear/pinion mill drives: The Metso QdX4TM Mill Drive provides the next step in the evolution of change in mill drive architecture, while allowing the system to be built with components that are within current manufacturing capabilities.
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— Ball mills, semiautogenous (SAG) mills, high pressure grinding rolls (HPGR), ringgeared mill drives (RMD) and gearless mill drives (GMD) — Ball/SAG mills with up to 8'000 kW per motor, typically geared solutions ('highspeed') using asynchronous motors with 68 poles and rated speed 1'000 1'800 rpm
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