Selecting Inching Drives for Mill and Kiln Applications
Selecting Inching Drives for Mill and Kiln Applications Glen Cahala Frank C Uherek, Principal Engineer - Gear Engineering Software Development Abstract The inching drive, also known as a barring or auxiliary drive, is an important component of any mill or kiln installation. It is used for maintenance and inspection purposes, as
SAG Mill Liner Design - Mineral Processing & Metallurgy
To a more significant degree than in other comminution devices, SAG Mill Liner Design and Configuration can have a substantial effect mill performance. In general terms, lifter spacing and angle, grate open area and aperture size, and pulp lifter design and capacity must be considered.
Starting of slip ring induction motor explained in an easy ...
A Slip Ring induction motor can be started with external resistance added in its rotor circuit. But how does external resistance aid in better starting characteristics? Read here to know about the starting arrangement and the role played by the external resistances in obtaining better starting characteristics. Also know about the qualities of slip ring induction motors.
SAG Mill Grinding Circuit Design
Ring-geared mills operated with frequency converter (much more than just variable speed) (English - pdf - Article) Use of the latest technology to overcome the demands of mill operation (English - pdf - Article) Ring-Geared Mill Drives - Flexible and smooth operation - Brochure (English - pdf - Brochure)
Sag Mill Synchronous Motors - Henan Mining Machinery and ...
Sag Mill Synchronous Motors Prompt : Caesar is a famous mining equipment manufacturer well-known both at home and abroad, major in producing stone crushing equipment, mineral separation equipment, limestone grinding equipment, etc.
21' x 11' Hardinge SAG Mill - Nelson Machinery & Equipment ...
21' x 11' Hardinge SAG mill with 2875 DC slip ring motor, inching drive, & lubrication located in South America. Equip yourself with the gold standard. 21' x 11' Hardinge SAG mill with 2875 DC slip ring motor, inching drive, & lubrication located in South America. Equip yourself with the gold standard.
INNOVATION NEWS Mills and GMDs - ABB Ltd
Mills and GMDs Maarten van de Vijfeijken* looks at large, larger and the largest units in grinding ore T he gearless motor (also called wrap-around motor or ring motor) is a very large synchronous motor. The poles of ... reliable drive system for SAG mills. Early SAG mills had a diameter of about 32', later
Ring gear drives huge grinding mill | Machine Design
Ring-motor drives were first used in cement industry mills and later in mining industry applications. The largest ringmotor- driven mill in the world is a 36-ft diam., 16,000-hp SAG mill that ...
miningring motor for ball mill - splendidkitchens.co.za
ABB to deliver three large gearless mill drives for . ABB's scope of supply consists of three complete GMD systems including transformers ring motors and E-house One 26 MW GMD system will be installed for a 40′ diameter SAG mill while two 20 5 MW GMD systems will be installed to drive two 27′ diameter ball mills In addition Kinross ordered the new ABB GAP-Watch TM for each system GAP
Sentinel: Siemens Gearless Mill Drives - YouTube
Jan 19, 2016· The mills at Sentinel in Zambia are amongst the world's biggest, with 2 off 40 ft SAG mills complete with 28 MW drives, and 2 off 28 foot-ball mills with 22 MW drives. For mines of this size ...
Gearless Mill Drives | Beneficiation | Siemens Global Website
The Siemens 42-ft Gearless Mill Drive, still an evolutionary design approach? (SAG Conf. 2015) Optimization of the drive system for a cyclone feed pump (SME 2015) Increasing availability through advanced Gearless Drive Technology (CMP 2014) Design and dynamic behavior of large ring motors for grinding mills (SMMH 2012)
Design and dynamic behavior of large Ring Motors for ...
Ring Motors vary the speed of the mill by changing the sta-tor frequency. A cycloconverter provides variable frequency for start, stop and speed variation during operation. Figure 1: Ring Motor of the 38' SAG-Mill of Rio Paracatú Mineraçao; Brazil 3 Design Verification To assure reliability of operation the mechanical design must be verified.
Phoenix: Big mill and latest tech keep long-lived mine ...
Jun 06, 2019· "The motor on our SAG mill is the fascinating part for me," Hope said. ... a big ring gear and pinions. A mill of this size would take two motors and pinions, one on each side," Tucker said. ...
Used Sag Mills for sale. Hardinge equipment & more | Machinio
21′ X 11′ HARDINGE SAG MILL. Manufacturer: Hardinge; 21′ x 11′ Hardinge SAG mill with 2875 DC slip ring motor, inching drive, & lubrication located in South America. Equip yourself with the gold standard.
Problem with Brushes chipping on large SAG Mill Motor 2.3 ...
Jun 11, 2010· We have a 2.3MW slip ring motor WRIM on the SAG Mill in the process plant. The issue we have is that the leading edge on the brushes on only ONE of the rings is chipping (7 brushes per ring). We have had this issue for 6/9 mths now, mill has been running 10 years with no problem.
Sag Mill Dual Pinion Geared Drive- VETURA Mining machine ...
Dual pinion sag mill vs single pinion sag mill pinion drive sag mill in europe crusher south ring geared mill drives single and dual pinion sag and ball mill is the function of a sag mill gear box autogenous and semiautogenous mills agsag mill drives mill motor gear drives can be offered for agsag grinding mill as dual pinion drives. More Details
Electrolytic starter (LRS) for high power slipring motors ...
The level variation of electrolyte is pretty slow, which does not enable resistance to vary quickly enough for some specific applications (control of the slip for the ball mills for example). Why using a starter for slip ring motors. In order to start a slip ring motor, the accelerating torque has to be sufficiently higher than the resisting ...
GMD infographic final - ABB Group
systems eliminate all mechanical components of a conventional mill drive system, such as ring-gear, pinion, gearbox, coupling as well as motor shaft and bearings, thus offering better energy efficiency, superior reliability, increased process availability and longer lifespan. The ABB gearless mill drive is the most powerful mill drive system in
INSTRUCTIONS FOR THREE PHASE INDUCTION MOTORS
(d) Motors should be put on pallets to prevent moisture. 2.2.2 Well protection Motors should be well shielded from dust, but under well-ventilated circumstances. For those water-cooling motors or using bearings with water-cooling coils, please make sure the water already dried off to prevent tube corrosion or danger of frost.
Difference Between Sag Mill vs Ball Mill - mech4study
Oct 12, 2017· SAG mill make use of steel balls included with some large and hard rocks for grinding. These mills utilize the balls in making the large fragments of materials broken into pieces. The ball charge of a SAG mill is about 9% to 20%.This process takes place inside the large rotating drum of SAG mill which is filled with balls partially.
Mining - Grinding and Processing | WEG
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 multilevel structure with medium voltage IGBTs, reducing the harmonic currents on the motor to extremely low levels.
AYCA | Services SAG mill Ring Motors - A&CA
SAG mill Ring Motors Ball mill Ring Motors Frequency Converters High current rectifiers for EW tank houses Medium and high power synchronous motors ... » Routine maintenance, minor and major shutdowns in SAG GMD drives. » Dielectric recovery through the application of "Cryogenic Cleaning" in electric machines.
SAG mills (semi-autogenous grinding mills) -
SAG milling extends itself to many applications due to the range of mill sizes available. They can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill and some or all of the work done by a ball mill. SAG mills are also an optimum solution for wet grinding since crushing and screening in these ...
Ok Tedi plans for long term with SAG mill upgrades by ...
For SAG 2, Siemens supplies two 8 pole, high speed induction motors to replace the existing slip-ring motors, eliminating all brush or slip-ring related outages and maintenance activities. The four identical variable speed drives (VSD) operating all four mill motors are Sinamics Perfect Harmony GH180 units.
Gearless mill drives - Grinding | ABB
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.
Milling - Energy intensive and high maintenance
ring-geared mills. In fact the rotor of the ring motor is the mill itself and the stator is built around the mill shell. This is also the reason why the ring motor is also known as wrap-around motor. 9 12 6 18 36 ... Presently SAG mills are mainly driven with variable speed drives, allowing the operator to react easily to the changes in ore
Grinding Mill Gear Assembly - Mineral Processing & Metallurgy
We will begin with the mill's bull gear assembly and work towards the motor, The BULL GEAR, sometimes called the RING GEAR is designed to turn the mill transforming the energy of the motor into motion for the mill. 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 ...
Advantages of SER drives for SAG mills | GoHz.com
Dec 19, 2014· Advantages of SER drives for SAG mills. Friday, December 19, 2014 ... So for a fixed torque and higher speed, the power obtained from the motor is higher than the motor nameplate rating. Brush/slip ring maintenance is one issue. However, when the brushes are specified correctly for the load, the wear is manageable. ...
Mill (grinding) - Wikipedia
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.
Gearless Drives - Siemens
autogenous grinding (SAG) mills in the framework of an order for two 32-foot SAG mills with a performance of 11,200 kW. This project for the Chuquicamata mine in Chile represented a monumental achievement, as the difference between creating a drive for a 21-foot diameter ring motor and a 32-foot ring motor …
SAG Milling in Australia -Revised Submission
Developments in SAG Mill Design and Operation Over the last few years, SAG mill manufacturing technology has advanced rapidly. The bounds of mill size have been pushed from two directions. Firstly, the advent of ring motors has removed the constraint applied by the power that a …