Metso Minerals Inc. installs brakes made by Twiflex Ltd. on its largest grinding mill

Nov. 4, 2010
Metso Minerals Industries Inc., Helsinki, Finland, just replaced five grinding mills at a Swedish copper mine with two of the largest mills commercially available. Each of the 22.5-MW mills uses wraparound motors and measures 38 ft in diameter and 45-ft long.

Resources
Boliden Mineral AB, www.boliden.se
Metso Minerals Industries Inc., www.metso.com
Twiflex Ltd., http://www.twiflex.com/

Metso Minerals Industries Inc., Helsinki, Finland, just replaced five grinding mills at a Swedish copper mine with two of the largest mills commercially available. Each of the 22.5-MW mills uses wraparound motors and measures 38 ft in diameter and 45-ft long. Together, they can grind about 2,025 tons per hour. But these large machines need powerful brakes. So Metso engineers chose Twiflex VMS-SP caliper brakes with pedestals, and eight will be installed on each mill. The brakes will hold the mills during maintenance and stop them in emergencies. They will also allow inching or creeping in case of bearing lubrication problems or power failures. Each mill will have brakes that generate 38 Nm of braking torque acting on a 1.297-m flange diameter. Each caliper weighs 1.85 tons and delivers 940 kN of clamping force. The brakes can stop one of the new mills in under 2 sec. md

© 2010 Penton Media, Inc.

Sponsored Recommendations

March 31, 2025
Unlike passive products - made of simple carbon springs - the bionic prostheses developed by Revival Bionics are propulsive, equipped with a motor and an artificial Achilles tendon...
March 31, 2025
Electric drives are a key technology for the performance of machines, robots, and power tools. Download this guide for an introduction to high-quality mechatronic drive systems...
March 31, 2025
Discover the world of maxon drive technology: motors, gearheads, sensors, controllers, and accessories. Configure your drive system online, including all relevant product and ...
March 31, 2025
Share current page XSun designs and manufactures a drone that is both energy-independent and can make its own decisions, for fully-automated missions. The company needed reliable...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!