Views
11 months ago

MDA Technologies 5/2015

MDA Technologies 5/2015

EXPLORE THE WORLD OF

EXPLORE THE WORLD OF ENGINEERING www.engineering-news.net RUBRIZIERUNGSEBENE I RUBRIZIERUNGSEBEBE 2

SUCCESS STORY Search for gold in Russia, via Austria and Germany 12,500 tonnes of Gold, That’s Russia’s gold deposits according to the ministry of natural resources based in Moscow. Making it the 3rd largest gold producer in the world. Most of these deposits are located in the east of Russia, far away from Moscow. The production of gold has seen a consistent rise in the past few years. In 2009, Russia produced 185 tonnes of gold, 202, 211, 226 and 237 metric tonnes in 2010, 2011, 2012 and 2013 respectively. Recently, one of the world’s biggest mechanically driven horizontal mills has been constructed to tap the maximum potential of the gold mine in Russia. Cemtec GmbH, a family owned Austrian company, is a specialist in designing equipment required for minerals and cement processing industry. In collaboration with Siemens, Cemtec developed a plant capable of processing 30,000 tonnes of crushed ore per day. This Russian operation involves installation of 2 large, high power grinding mills in order to process the 30,000 tonnes of ore per day. Of the 2 gigantic mills, one of them About Company name: Siemens AG Brands: Flender Headquarters: Bocholt, Germany Products: Helical and Bevel-Helical Gear Units, Planetary gear units, Customer specific Gear units is a Semi-autogenous grinding mill (SAG) and other is ball mill. The SAG mill measures 10.4 x 6.1 meters with a drive output of 15 MW and the ball mill, 8.2 x 14 meters in dimension and 18MW rating. The SAG mill reduces the ore fragments of size 250 mm down to 2 mm. The ball mill further crushes the 2 mm fragments down to 74 µm. At 18 MW rating, the ball mill is one of the largest horizontal mill in the world. To get the gears running this huge machine requires 2, Siemens type 1RR5108-6FA90-Z, 3-phase asynchronous motors with slip ring rotors. With each of them delivering a 9 MW output. The 2 motors are started in parallel with a fluid starter, and have an efficiency slightly more than 97 %. However, the highlight of this operation in Russia is not the size of the mills installed. But the gear unit developed by Siemens. Siemens gear technology ensures extreme efficiency The SAG mill and the Ball mill, both are driven by 2 special Siemens DMG2 gears. In a typical mechanical drive system, only one pinion engages on each side of the gear rim. This limits the output to 8 MW per drive. With Siemens special DMG2 girth gears, the power transmission capabilities were expanded from 8 MW to 12 MW. This growth in power transmission capabilities was achieved mainly due to number of pinions engaged with the girth gear at any one time, and the position of the pinions. In the DMG2 gear units, Siemens positioned 2 pinions, one above the other, which mesh directly with the girth gear. The self-aligning output pinions are supported in angular contact bearings, this enables the engagement between the pinion and the girth gear profile to be optimum. This ensures that the load being transmitted is distributed evenly across the two drive pinions meshing with the girth gear due to the axially free movement of the moveable shafts. The double pinion design offers 2 fundamental advantages, one, the width of the tooth flanks is considerably smaller than a conventional single pinion engagement system. Second, the more expensive helical gear teeth which would have been 50 MDA Technologies 5/2015

E-PAPER KIOSK:

WORLD OF INDUSTRIES - MOTION, DRIVE & AUTOMATION 1/2017
WORLD OF INDUSTRIES - MOTION, DRIVE & AUTOMATION 2/2017
WORLD OF INDUSTRIES - MOTION, DRIVE & AUTOMATION 3/2017
WORLD OF INDUSTRIES - MOTION, DRIVE & AUTOMATION 4/2017
WORLD OF INDUSTRIES - MOTION, DRIVE & AUTOMATION 5/2017
Automation Technologies 1/2016
Automation Technologies 2/2014
Automation Technologies 2/2015
Automation Technologies 2/2016
Automation Technologies 3/2014
Automation Technologies 3/2015
Automation Technologies 3/2016
Automation Technologies 4/2014
Automation Technologies 4/2015
Automation Technologies 4/2016
Automation Technologies 5/2014
Automation Technologies 5/2015
Automation Technologies 5/2016
WORLD OF INDUSTRIES - Industrial Automation 1/2017
WORLD OF INDUSTRIES - Industrial Automation 2/2017
WORLD OF INDUSTRIES - Industrial Automation 3/2017
WORLD OF INDUSTRIES - Industrial Automation 4/2017
WORLD OF INDUSTRIES - Industrial Automation 5/2017