The test and study work showed that a single line 42 ft SAG mill circuit gave the most favorable project economics in comparison to an equivalently powered single line 40 ft SAG mill circuit. ... Variable speed drive solutions dedicated to single or dual pinion ring-geared mills offer significant advantages over conventional drives due to their ...
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conventional mill drive system, such as ring gear, pinion, gearbox, coupling or air clutch, motor shaft and motor bearings. Eliminating ... SAG mill has a much larger diameter compared to its length. Yet the SAG mill of Newmont's Yanacocha mine in Peru is a single stage mill (no ball mill after the SAG mill) and ...
Gear wear is minimised by the use of Austempered Ductile Iron (ADI) in castings. ADI has a high torque/weight ratio, together with increased resistance to fatigue and wear for a longer ring gear life. Highly accurate production and assembly techniques minimise vibration and further enhance the long service life of David Brown Santasalo girth gears.
main focus on the low mechanical stress impact of these mill drives on the pinion and ring gear, as well as the accuracy of the load sharing between the two motors. KEYWORDS SAG mill, ball mill, ring gear, dual pinion, drive systems, variable speed INTRODUCTION The project is located 15 km southwest of Princeton, British Columbia (BC), an ...
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Key Words: Grinding, gearless mill, ring-geared mill, variable speed drives . ABSTRACT ... SAG and Ball has a long and technically interesting history. It can be said; almost every decade in the last half century had its own trend. ... side of the mill. Single and dual pinion configurations can be powered by low speed synchronous motors (approx ...
Monitoring pinion temperatures on mill gear pinions is an effective and efficient means of monitoring alignment and operating condition. Pinion temperature measurement when applied properly can adequately predict multiple failure modes, including misalignment, overheating from a loss of lubricant event, overheating from …
The pinion is a small gear with a matching tooth profile to the ring gear on the ball mill. From a bearing point of view, there are two bearings at the end of the shaft on the pinion and there are ...
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We have two Ball Mills and one Sag Mill. We had some visual inspection on pinion and ring gears, during these inspections we found some abnormal wear on this gears (pictures show this problem in enclosure). ... 2- You need to monitor your pinion's spectrum in velocity with fmax of 85 time turning speed or at least 3-gear mesh. Take at …
a technical paper on the occasion of the SAG 2006 in Vancouver, B. C. Canada: "Lessons learnt from recent failures of gear drives on mills in South Africa" This study came up with the conclusion that failures occur in five main areas of a mill drive train: • Gear reducers • WRIM rotors • Pinion bearing housings • Pinion shafts
03 – Alignment of pinion. After the alignment of the big gear ring is completed, the pinion device shall be put in place according to the requirements of the drawings, the center height of the pinion shall be retested with a level gauge, and the sizing block shall be replaced if necessary to adjust the elevation.
SAG mill is an investment that can produce handsome returns if extra production is needed or simply to give the mine the option to mill the hardest ores at …
Cemtec and Siemens jointly developed a standard-equipment, economical solution to handle the power needed to drive a 10.4 x 6.1-m, 15-MW SAG mill and an 8.2 x 14-m 18-MW ball mill at this Russian gold mill site.
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].
The QdX4TM 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 …
• New gear and pinion design, to increase performance through improved strength and resistance • Compatibility evaluation, to ensure other mill components operate properly at new production levels Gear and pinion services Design upgrades for increased production Make the most out of your new gears and pinions.
Maximise the productivity of your operation with durable high-efficiency Semi Autogenous Mill (SAG mill) and Autogenous Mill (AG Mill). ... Our mills use conventional geared drives for transmitting up to 18,000 kW of …
With this innovative concept the gearless mill drive eliminates all critical mechanical components inherent within a conventional mill drive system, such as ring gear, pinion, …
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answered. Depending on the mill size and type, the mill can be driven by several configurations of drive systems. The main options are single low speed motors connected to a pinion driving a ring gear, two low speed motors connected to two pinions and driving a ring gear, or a gearless motor mounted directly onto the mill. In addition, a gearbox
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Picture of a typical GMD system for a SAG mill Figure 2 presents the power circuit of a cycloconverter fed synchronous motor. The synchronous motor has one 3-phase winding ... low speed motors connected to a pinion driving a ring gear, two low speed motors connected to two pinions and driving a ring gear, or a gearless motor mounted directly ...
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For power requirements up to approximately 4,476 kW (6,000 hp), it is convenient to drive the mill through a ring gear and single pinion arrangement. The pinion is driven by a low speed brushless …
The Gearless Mill Drive system consists of the ring motor with its feeding cycloconverter, pre-installed in an E-house. It also includes the excitation rectifier, the automation sys- ... measures, e.g. inspections of the SAG mill. This avoids fixed speed pinion drives have to be stopped with a prior grinding-out / drain-out process before ...
SAG mill is an investment that can produce handsome returns if extra production is needed or ... Test No. Lab SAG Test Cum. Dist.% Pinion kWh/t of Ore . 1 3.59 5 2 6.13 15 3 7.00 25 4 7.51 35 5 7.88 45 6 8.12 55 7 8.41 65 8 9.00 75 9 10.17 85 10 11.89 95 These data points are shown in graph form below as Figure 1. ...
