Ball mills of greater length are termed "tube mills " and when hard pebbles rather than steel balls are used for the grinding media the mills are known as "pebble mills '' In general ball mills can be operated either wet or dry and are capable of producing products on the order of 100 um Every mining operation has a unique grinding process has experience of over 8 000 grinding mills globally including manufacturing and delivering the largest SAG/AG mills in the world Our experts welcome the opportunity to assist you with circuit and circuit control design as well as start-up operation and optimization of your mill

manuel molino affaissement siemens

SHANGHAI HcN MINERALS CO LTD Es un grupo de ingeniera de alta tecnologa Estamos especializados en la investigacin desarrollo y produccin de trituracin industrial molienda de polvo equipos de procesamiento de minerales y otros dispositivos relacionados

Gearless Motor Drives for Grinding Mills Fig 1 General scheme of a Gearless Mill Motor drive [24] of the airgap is in the range of 15-17 mm A tolerance of +/- 3 mm is considered for setting alarms and protections The motor is fed with variable frequency by a cyclocon-

Table of ContentsStructural Design of Mill and BearingsStructural Design of the BearingOperational ResultsMaintenance of "Gearless Drive" Mill The reliability of large diameter high horsepower ball mill is paramount when large production and minimum downtime is required The 17 ft x 56 ft double compartment ball mill at St Lawrence Cement Company has the first gearless drive built in

INCREASING AVAILABILITY THROUGH ADVANCED GEARLESS DRIVE TECHNOLOGY M Combes1 C Dirscherl2 *T Roesch3 1Glencore Xstrata Av Apoquindo 3885 Santiago Chile 2Siemens Industry Inc 7810 Shaffer Parkway Littleton CO 80127 United States of America

ABB's delivery included one gearless mill drive system (GMD) for a 40-feet semi-autogenous mill and two low-speed dual pinion ring-geared mill drive systems (RMDs) for two 26-feet ball mills making Mount Milligan's grinding circuit one of the most advanced and powerful in North America

Simence Ball Mill Ciment

GRINDING MILLS-BALL MILLS-Page 3-New Used Mining The ball mill is a key piece of equipment for grinding crushed materials and is widely used in production of powders such as cement silicates refractory material and glass ceramics as well as for ore dressing of

Svendborg Brakes BSFA 1000 Series braking systems provide a minimum of 11 414 975 Nm braking torque for the 40 ft diameter 26 ft long 32 000 HP gearless SAG mill and 10 584 241 Nm braking torque for each of the two 27 ft diameter 46 ft long 27 000 HP gearless ball mills

Updates on geared vs gearless drive solutions for grinding mills SME 2013 Abstract The current paper looks at evaluating the merits of large geared mills versus gearless driven mills by evaluating the following factors The capability of currently available systems in terms of power and mill diameter Preprint 13-050 ceecthefuture

Since January 2010 Chile's Minera Los Pelambres Ltda is operating a new SAG mill and a new ball mill equipped with gearless drives systems by Siemens The mills are intended to increase processing capacity for copper ores Siemens already equipped two mills for Los Pelambres in 1999 and has been responsible for maintenance of the conveyor belt equipment for more than 10 years

estimate to use in the case of gearless drives would be 3-4% ie the estimated Pictures of the insides of an AG mill and a SAG mill which have been crash Gearless AG/SAG mills With the proven use of gearless drive technology the limitation of AG/SAG mill size due to gearing constraints has been eliminated is the world's leading

Ukraine coal mining crusher coal hammer crusher for sale ZENITH processing equipment ensure efficient size reduction of hard coal and lignite in every crushing stage and are individually designed to match requirements at site our most popular coal crushers and pulverizers are coal jaw crusher impact crusher cone crusher hammer crusher ball mill vertical roller mill and so on

gearless ball mill drive - nenss gearless mill drive optical systems - mill for sale - ABB Contact 2/11 pakistann subcontinent edition by ABB The world's first gearless mill drive was delivered by ABB in 1969 and is still in substation advantages of gearless drives on ball mills

Gearless Mill Drive Sales Rev Up to Meet Demand By Russell A Carter Managing Editor Gearless mill drives are becoming the drive system of choice on large AG SAG and ball mill installations for new projects and existing mill expansions

SAG Mill Grinding Circuit Design

Gearless drives (wrap-around motors) are typically used for large mills with mills of 25 MW or larger having been designed Several circuits have single-line design capacities exceeding 100 000 TPD A large SAG installation (with pebble crusher product combining with SAG discharge and feeding screens) is depicted here below with the

Hammer Mill Vue En Coupe mahine de coupe de gran -CPY manufacturers Machine Broyer Des Noix Tigr Es - oregrinder- mahine de coupe de gran trs puissante ce type de machine utilise des du granite India machine meuleuse du granite Dcouvrez les offres de la catgorie Machine coupe granit Machine granit - Achat / Vente Machine granit pas cher Accessoire machine (23) Coupe carrelage (1) Plus

Svendborg Brakes BSFA 1000 Series braking systems provide a minimum of 11 414 975 Nm braking torque for the 40 ft diameter 26 ft long 32 000 HP gearless SAG mill and 10 584 241 Nm braking torque for each of the two 27 ft diameter 46 ft long 27 000 HP gearless ball mills

ABB s delivery included one gearless mill drive system (GMD) for a 40-feet semi-autogenous mill and two low-speed dual pinion ring-geared mill drive systems (RMDs) for two 26-feet ball mills making Mount Milligan s grinding circuit one of the most advanced and powerful in North America

Gearless mill drive system gearless mill drive optical systems 30 years experience with Semi Autogenous and Autogenous Grinding Mills geared or gearless drive Get Price And Support Online ABB Ability for Mining ABB Ability™ for mining Currently ABB offers more than 600 mine hoist solutions and over 125 mill drive systems

supplied by Svendborg Brakes for its gearless SAG mill and twin gearless ball mills The large open-pit mine produces approximately 45 000 tonnes of copper annually The braking systems for each of the three mills consist of BSFA 1000 Series mono-spring caliper disc brakes controlled by a Svendborg Brakes gearless mill hydraulic power

The HH Roberts gearless vector drive heads fit Bridgeport standard knee mills and Taiwan made clones These heads were first developed for CNC knee mills these heads make great low maintenance upgrades with up to 6000 rpm and digital display of speeds They have 85 fewer parts than a

Two general classifications of gearing are used for ball Mill drives These are the spur gear and the helical gear Helical gearing may be either of the single helical or double helical (Herringbone) design SPUR GEARS These are generally furnished on the smaller diameter mills

Sep 28 2014Introduction We have written on risk associated with large ring motors in gearless mill drives previously [1 2 3] In [1] we observed that ABB and Polysius were far too confident in 2001 when they claimed that 42 and 44 ft diameter mills and ring motors posed only manageable risks and that a 44 ft mill and GMD design was ready and waiting for a purchaser [4]