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Power Transmission Products amp Solutions for Cement Rexnord
Map shows a typical cement processing plant REXNORD DRAG CONVEYOR LIMESTONE QUARRY Gear Drives Falk V ClassTM Gear Drives Autogard® gear manufacturer As a result our ring gears are chosen for use in a variety of installations including large diameter kiln ball mill SAG mill and other high power
failure analysis gears shafts bearings seals Rexnord
TYPICAL TORQUE IN STEEL MILL DRIVE FLUCTUATING Distress or failure of gears may be classified into four categories Grinding cracks may also have the appearance fillets snap ring grooves fit corners fretted areas key or
Move to Zero Unplanned Downtime Emerson
equipment fails Even during routine maintenance rounds your workers may fail to see emerging equipment problems causing the cycle of unplanned downtime to continue It 39 s Spot problems earlier and curb repair costs using the earliest fault detection technology available operating SAG Mill ring gear Because this nbsp
Copper Mountain Overview on the grinding mills and their dual
This paper will first give a short overview of the Copper Mountain project in British Columbia which just has started commercial operation earlier this year The grinding process with one 34 39 x 20 39 SAG mill and two 24 39 x 39 5 39 ball mills will be briefly discussed All three mills are gear driven by a ring gear dual pinion and two nbsp
New ASTM Standard for Mill and Kiln Ring Gear Cleaning and
ASTM International Standard E2905 was written for mill and kiln ring gear teeth cleaning and inspection It will scan the addendum dedendum and root of a gear tooth in 15 seconds With 2 and 3D E2905 will allow SAG and ball mill maintenance planners to reduce the time it takes to perform gear inspections
Root cause analysis of bowl mill pinion shaft failures ScienceDirect
Bowl mills work predominantly on the principle of crushing An AC motor coupled to a pinion shaft transfers the torque to worm gear mounted on the vertical shaft This is mainly responsible for the subsequent movement of the bull ring segments through smaller gears mounted below it The movement of bull ring segment nbsp
Bearing Fault Detection Permanent Condition Monitoring System
Fatigue cracks in shafts at shoulders or under bearing inner rings such as on large This Sag mill example is an inner race fault on a reduction gearbox nbsp
SAG MILL YouTube
21 May 2010 and the control system upgrade in 2005 and motor directions were confirmed in which they were right first time as that is the easy part of the automation done with a software check The girth gear was only replaced due to mechanical failure What a difference between 39 thought 39 and 39 actual 39 Read more
Read our Success Stories Horsburgh amp Scott Gear Up
Horsburgh amp Scott used their gearing expertise to complete a repair on a mill The steel mill had gearbox failure on a large BOF drive that became frozen confidence with a stronger more reliable SAG mill replacement gear the ability to rotate the outer gear ring without having to remove the assembly off of the shaft
Gearless Mill Drive Protection Improvements and Its CiteSeerX
Drive Comments SAG Mill Semi autogenous Grinding Quantity 1 unit Composed of a twelve pulse cycloconverter together with a synchronous ringmotor Power 26 000 HP addition it does not need any gear box and ring gear and therefore snubber network system and failed thyristors detection connected nbsp
ONLINE SAG MILL PULSE MEASUREMENT AND OSTI gov
throughput make up ball size mill speed liner profile and ball addition rates fails because the ore hardness changes too often capture all the impacts both on and off center The slip ring was attached to the mill using a slip ring holder A slip ring holder is a hollow steel cylindrical shell custom made to the size of nbsp
Retrofits for grinding mills
either to restore your grinding mill to its original condition by systems shell motor trunnion gear guard feed chute inching drive gear trunnion seal damaged piston ring seal grooves can be identifying the cause of failure then improving nbsp
Move to Zero Unplanned Downtime
your workers may fail to see emerging equipment problems causing the But when a critical asset fails your staff concentrates operating SAG Mill ring gear
Availability and Reliability of Siemens 39 Gearless Drives
In 2005 Siemens the same fault was discovered on a 38ft SAG Mill in Chile applying to all ring motors fabricated after the issue in Cadia 2003 The repair of the switchgear required five days and the Gearless Drive continued operation on nbsp
Power Transmission Products amp Solutions for Cement Rexnord
most rigorous demands in your cement mill applications including gear drives bearings bucket elevator grinding it 39 s clear why Rexnord is the world 39 s leading ring gear temperatures and prevent leakage which can cause gearbox failure
Gearless Mill Drive Protection Improvements and Its CiteSeerX
Laguna Seca concentrator uses a SAG mill and three ball mills all driven by addition it does not need any gear box and ring gear and therefore eliminates snubber network system and failed thyristors detection connected across the nbsp
ONLINE SAG MILL PULSE MEASUREMENT AND DoE OSTI
ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION SEMI throughput make up ball size mill speed liner profile and ball addition rates At the fails because the ore hardness changes too often The slip ring holder was screwed to the mill shell so that it would not fall during drive side of the gear box
Mining Mill Braking Technologies Altra Industrial Motion Newsroom
It is not unusual to find SAG mills up to 40 feet in diameter and Ball mills of Boston Gear middot Delroyd Worm Gear middot Nuttall Gear For these large drives the solution has been to introduce low speed ring motors wrapped around one end of the mill for safety and static control in the event of total power failure for example
Failure Analysis Gears Shafts Bearings Seals Rexnord
commonly subject to distress are the gears shafts bearings and seals The purpose these failure modes For drives that are properly designed and manufactured abnormal distress or failure can result from misapplication or poor installation or poor maintenance Continuous TYPICAL TORQUE IN STEEL MILL DRIVE
a reliability analysis for the grinding process Theseus
27 Jun 2011 Abstract This Bachelor 39 s thesis was made in collaboration with the Service Product Center Espoo of Outotec Finland Oy during the spring semester 2011 The main objectives of this thesis were to create a reliability analysis of the mineral enrichment process grinding circuit and to examine the possibili
liquid resistance starters NHP
machines such as ball and SAG mills crushers conveyors draw a wound rotor or slip ring motor can a gear motor and belt drive A clutch Starter fault
Read our Success Stories Horsburgh amp Scott Gear Up
The steel mill had gearbox failure on a large BOF drive that became frozen due to rust corrosion heat and 25 years of heavy use Production at the mill Horsburgh amp Scott manufactured a new bull gear with the ability to rotate the outer gear ring without having to remove the assembly off of the shaft Horsburgh amp Scott nbsp
Minerals Industry Drive Solutions
gearboxes for crushers mills kilns conveyor belts bucket wheel excavators Primary Crushing Mine Shaft System Heap Leach Process Grinding case of a small run out failure at the girth gear air cooler Ring gears and bevel stage
High pressure grinding rolls applications for the platinum industry
standard milling circuit of the platinum industry which There is not one single structural failure Wet grinding mills with large diameter ring gears and
issue 31 Outotec
at risk including axial and radial pad bearings axial and radial pad stools trunnion bearing journals mill heads shells critical fasteners ring gear and the pinion Some components will fail immediately and are easily identified by visual checks Others will be identified by abnormal pressure flows or temperatures if the mill
Crusher Wikipedia
A crusher is a machine designed to reduce large rocks into smaller rocks gravel or rock dust Where the Dutch had failed in casting iron one of Darby 39 s apprentices John Thomas succeeded in 1707 and as Burke put it quot had given In this context the SAG mill and ball mill are considered grinders rather than crushers
Root cause analysis of bowl mill pinion shaft failures ScienceDirect
Pinion shaft Bowl mill Bull ring segments Keyway crack Overloadfailure An AC motor coupled to a pinion shaft transfers the torque to worm gear mounted on OES after grinding the sample as per the sample preparation specifications
Locked charge starts and your grinding mill Outotec
absorption so a failure of mill bearings normally ball mills Insufficient ball charge A high ratio of ore to ball charge in a ball mill ring gear and the pinion
Ring gear continuous infrared monitoring IEEE Xplore Document
Premature wear and catastrophic gear failure can be avoided by early detection grinding mills ring gear continuous infrared monitoring infrared temperature nbsp
Download the January February 2009 Issue in Gear Technology
See how superfinishing enhances lubrication capabilities and fuel savings Gear Failure Analysis Involving Grinding Burn Presented are the metallurgical The ball mill is 20 ft in diameter with 8 580 hp The gears should be operational by mid 2009 With investments in machining and gear cutting technology along
Outotec® Grinding technologies
autogenous SAG mills autogenous AG mills ball mills pebble power failure The bearing Mill drives Most mills are driven by ring gears with a 360° fully
Availability and Reliability of Siemens 39 Gearless Drives
In 2005 Siemens the same fault was discovered on a 38ft SAG Mill in Chile This mill started operation in 2003 and its Gearless Drive is of the original design with regard to the rotor pole segments and their support structures This Gearless Drive did not include the improvements Siemens began applying to all ring motors nbsp
New ASTM Standard for Mill and Kiln Ring Gear Cleaning and
ASTM International Standard E2905 was written for mill and kiln ring gear teeth cleaning and inspection It will scan the addendum dedendum and root of a gear tooth in 15 seconds of a catastrophic gear failure over a 10 day E2905 will allow SAG and ball mill maintenance planners to reduce the time it takes to nbsp
CR4 Thread Ball Mill Girth Gear and Pinion Alignment
Link SAG Mill Girth Gear Failure Averted will show the contact area the pinion should contact the girth quot ring quot near the center of the gears
world 39 s largest forged steel gear Hofmann Engineering Pty Ltd
addition to the 17 000kW double pinion SAG mill gear shown in the sions Due to the mine having 4 Hoist Transmissions at risk of failure a first priority delivery was ty forgings and the interlocking hub to outer ring via full penetration nbsp
paper ABB Group
Key Words Grinding gearless mill ring geared mill variable speed drives Page 2 ABSTRACT The size of mills driven by ring gear or by a gearless solution has reducer the maintenance requirements and possible root cause for failures nbsp
Locked charge starts and your grinding mill Outotec
at risk including axial and radial pad bearings axial and radial pad stools trunnion bearing journals mill heads shells critical fasteners ring gear and the pinion Some components will fail immediately and are easily identified by visual checks Others will be identified by abnormal pressure flows or temperatures if the mill
Ring gear drives huge grinding mill Machine Design
By this summer a grinding mill that is bigger around than a Boeing 747 will turn grinding mill SAG see next section will use a 43 ft diam ring gear drive to forged pinions thus reducing discontinuities which may cause fatigue failures
world 39 s largest forged steel gear Hofmann Engineering Pty Ltd
addition to the 17 000kW double pinion SAG mill gear shown in the picture Hofmann Engineering Due to the mine having 4 Hoist Transmissions at risk of failure a first priority delivery was requested Well supported by ty forgings and the interlocking hub to outer ring via full penetration welding supplies positive solid nbsp
Grinding Mill Gear Assembly 911 Metallurgist
17 Mar 2017 We will begin with the mill 39 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 By mill we refer to Ball Mills Rod Mills and SAG Mills A power failure will result possibly plugging or damaging the equipment
Peter Warner Professional Profile LinkedIn
b Resolving repeated brush gear failure on a dual pinion mill caused by The first 40 39 GMD on a SAG mill in Australia failed due to sub harmonic resonance The implications of controlling the speed of a slip ring motor by using a slip nbsp
Ring gear drives huge grinding mill Machine Design
By this summer a grinding mill that is bigger around than a Boeing 747 will turn chunks of copper ore into gravel sized bits for smelting and refining The largest ring gear will make it happen
Minerals Industry Drive Solutions
Parallel shaft single stage reduction gear units type WA are designed for torque transmission from electric motors to ball rod SAG AG or other types of horizontal mills Their main purpose is to drive comminution machinery for excavated materials in the mineral processing industries WB stands for double stage gearbox nbsp
Ring Gear Cleaning and Inspection – Mill and Kiln Ring Gear Drives
24 Jul 2015 We help clients avoid preventable machine failures Condition Assessment for ASTM E2905 was written based on the Gear Pro™ method for mill ring gear drive cleaning and inspections ASTM E2905 than other methods Cleaning and inspection times for a 10m SAG Mill gear drive is seven hours
Output Issue 31 September 2012 Outotec
absorption so a failure of mill bearings normally ball mills Insufficient ball charge A high ratio of ore to ball charge in a ball mill ring gear and the pinion
Outotec® Grinding technologies
The thrust bearing design is similar to a trunnion supported mill but rather mounted on the mill periphery alongside the journal for the multipad bearings The ring gear on shell supported mills is normally mounted onto a flange centrally located on the mill shell away from the ends This enables the remaining components of
CR4 Thread Ball Mill Girth Gear and Pinion Alignment
Can someone explain how to perform a pinion amp girth gear alignment Link SAG Mill Girth Gear Failure Averted 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 quot ring quot near the center of the gears
Milling Energy intensive and high maintenance
motors connected directly to the pinions driving the ring gear or by high speed motors Presently SAG mills are mainly driven with variable speed drives allowing the Canada Lessons learnt from recent failures of gear drives on mills in
Conga The world 39 s first 42 foot diameter 28 MW gearless SAG mill
failures have not occurred in large GMD SAG mills the mill design was not exempt inherent within a conventional mill drive system such as ring gear pinion nbsp
Global Inspections NDT Inc Gear Inspection Canada and USA
This practice standardizes the inspection method for large ring gears and Safely cleaning a 40 39 diameter SAG mill gear under production takes approximately 1 hour It also includes an onsite engineering assessment of the failure modes nbsp
Grinding Mill Gear Assembly 911 Metallurgist
28 Jul 2015 We will begin with the mill 39 s bull gear assembly and work towards the called the RING GEAR is designed to turn the mill transforming the energy of A power failure will result possibly plugging or damaging the equipment
paper ABB Group
Key Words Grinding gearless mill ring geared mill variable speed drives Page 2 ABSTRACT The size of mills driven by ring gear or by a gearless solution has significantly increased in the last years The method of powering mills such as AG SAG and Ball has a long and technically interesting history It can be said nbsp
Global Inspections NDT Inc ASTM E2905 Gear Inspection
Founded after 35 years of experience within the mining industry based on the identified need for efficient amp reliable assessment of mining equipment
New Standards for Large Ring Gears for Mills Kilns Gear Technology
15 Sep 2013 Methods of examining large ring gear teeth to detect diameter ring gears can be cleaned in less than an E2905 will allow SAG and ball mill