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Mill load sharing – Maintains equal torques on dual pinion mills throughout the whole speed range. Controlled rollback – Prevents backlash and reduces downtime. Mill power ride through – Keeps the mill operating even under voltage dips. Over-duty cycle – Avoids unexpected downtime if the mill .
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The QdX4™ Mill Drive was developed in close collaboration with both CMD and Ferry Capitain Engineering as a solution for the mining industry for large mill drives. The QdX4™ Mill Drive features internal torque splitting capability transmitting motor input power to the pinion shaft and equally dividing into two mill pinions. This type of torque splitting gear box technology has ...
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Benefits of continuous data acquisition from critical large drive systems in a mine operation (SME 2016) Frozen charge detection and automatic loosening with gearless mill drives (SAG Conf. 2015) Mill drives: the desire for increased power and the associated limits and conditions (SAG Conf. 2015)
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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]. This paper takes a closer look at the current manufacturing ...
OBTENER PRECIO >>dual pinion sag mills. ball mill pinion alignment pdf riskmark. from common ball mills there is a second type of ball ball mill alignment pdf SKD grinding mills and their dual pinion mill how to align ball mill pinion to drive motor SAG mill, ball mill, ring gear, dual pinion, drive systems, variable speed INTRODUCTION, alignment of the girth gear Two SAG mills with . Get ...
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Some consultants have the view that the gear drive is limited in power. Mr Craig Denecki (Falk Milwaukee) in his paper, presented at the 1996 SAG mill conference, provided details of the then largest gear drive in operation on a SAG mill (34ft x 18ft) at Escondida 13.4MW, which began operation in 1995. The reason for not having larger gear drives
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An electrical impact study between variable speed dual pinion mills and gearless mill drives Abstract: Conventional mining process circuits use both Semi-Autogenous Grinding (SAG) and Ball mills. It is very common that the SAG mills are operated with adjustable frequency drives (AFDs) and the Ball mills are operated at fixed speed [1].
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An electrical impact study between variable speed dual pinion mills and gearless mill drives Abstract: Conventional mining process circuits use both Semi-Autogenous Grinding (SAG) and Ball mills. It is very common that the SAG mills are operated with adjustable frequency drives (AFDs) and the Ball mills are operated at fixed speed [1].
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• Drive 1 - A 5000 HP, 1200 rpm wound rotor motor with liquid rheostat and power factor correction capacitors to a dual pinion gear driven mill; • Drive 2 - A 5000 HP, 514 rpm synchronous motor with an air clutch and gear box to a center drive mill; a Drive 3 - A 5000 HP, 514 rpm synchronous motor with soft-start and an air clutch and
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DS#08657 1 used 8' dia. x 10' long, Allis Chalmers Ball Mill. Wet grind, grate discharge, spout feed; Single helical gear ring and pinion drive with gear guards
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However, pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill. Dapatkan Dukungan Online (PDF) Technical Evaluation and Practical Experience of . paper presents a technical evaluation and practical experience of two different technologies used in high-power grinding mill ...
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The Slip Energy Recovery Drive (SER Drive) is a technology well proven in the industry for large power motoring systems that allows precise motor speed control at the same time that recover the slip energy in the Wound Rotor Induction Motors (WRIM).They are also the dominant technology in wind turbines.
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These mills are typically powered using electricity and depending on the required power have different configurations such as central drive, single pinion, dual pinion and gearless mechanical set-up. AG and SAG mills are extensively used in the mining industry for extracting minerals such as metals, oil shale, limestone, rock salt, coal ...
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However, pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill. Dapatkan Dukungan Online (PDF) Technical Evaluation and Practical Experience of . paper presents a technical evaluation and practical experience of two different technologies used in high-power grinding mill ...
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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.
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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
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In the island state of Papua New Guinea, Ok Tedi Mining Limited (OTML) runs the copper and gold mine Ok Tedi. OTML's drive train infrastructure at the Ok Tedi mine is in excess of 30 years old. In order to ensure long term profitability, OTML is using Siemens technology to supply and install complete new variable speed drive trains for the two Semi-Autogenous Grinding mills SAG 1 and SAG 2.
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Mill load sharing – Maintains equal torques on dual pinion mills throughout the whole speed range. Controlled rollback – Prevents backlash and reduces downtime. Mill power ride through – Keeps the mill operating even under voltage dips. Over-duty cycle – Avoids unexpected downtime if the mill .
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The largest ringmotor- driven mill in the world is a 36-ft diam., 16,000-hp SAG mill that processes up to 2,000 tons of ore per hour. Located at Kennecott Utah Copper near Salt Lake, this mill ...
OBTENER PRECIO >>Ball Mill PINION SHAFT BEARINGS. Pinion shaft bearings are of the SKF anti-friction type mounted in a common twin bearing assembly. Bearings are fixed in place so that the pinion shaft of the mill is always in alignment with the drive components. V-belt driven mills are furnished with an outboard bearing of similar construction. Also available are bearings of the double rigid ring oiling type ...
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single-stage SAG mills to the largest mill in the world – with a 40-foot diameter and 28 MW of motor power. Ball mills Ball milling is the most common application for horizontal tumbling mills. Outotec offers a full range of ball mills to suit a wide variety of duties, from a few hundred kW all the way up to 20 MW and beyond. Rod mills Outotec rod mills are designed to cope with the ...
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Due to the low speed nature of the drive train, a torque limiting coupling is fitted to protect pinion and girth gear from eventual transient torques. As a result, the air-clutch that previously transferred the drive power to the mill can be removed, eliminating all air-clutch related outages and maintenance activities. For SAG 2, Siemens supplies two 8 pole, high speed induction motors to ...
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However, pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill. Dapatkan Dukungan Online (PDF) Technical Evaluation and Practical Experience of . paper presents a technical evaluation and practical experience of two different technologies used in high-power grinding mill ...
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In the second quarter 2018, an Australian based Engineering Procurement and Construction company, awarded Ingeteam a project where the scope of supply includes project management, basic and detailed engineering, on-site services and two INGEDRIVE Medium Voltage Variable Frequency Drive (VFD) with the corresponding ONAN rectifier transformers for feeding one single pinion 7 MW SAG Mill and one ...
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Our GMD eliminates all mechanical components of a conventional mill drive system, such as ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings: By mounting the rotor poles directly onto the mill, the mill itself becomes the rotor of the gearless motor. The motor is fed by a fuse-less cycloconverter that is connected to the MV network through three special cycloconverter ...
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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.
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Variable Speed . Single or double pinion driving systems. Designed to drive and control the speed of the medium voltage motors coupled to the SAG/AG, ball and HPGR mills with single or double pinion, the MVW01 frequency drive uses state of the art technology through a level structure with medium voltage IGBTs, reducing the harmonic currents on the motor to extremely low levels.
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SAG mill drives (as GMDs) by some operators and principal motor designers/manufacturers until the reasons for known problems in design or manufacturing were better understood and resolved. Accordingly, the latest 40 ft dia. SAG mill is rated at 29 MW and 78% C.S., with a 42 ft dia. mill built but not yet operational. The more recent option
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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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dual pinion mill drives from ABB to drive these mills. Brief History Sophisticated Dual Pinion Mill Drive Technologies About five years ago, ABB was already the market leader for Gearless Mill Drives (GMD). ABB had delivered several projects where the scope has been the GMD for the SAG mill, but was often not awarded to supply the gear driven ball mill motors. ABB then decided to enter also ...
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