Conveying to stop
Twifl ex’s disc brakes can meet the challenging requirements of overland coal conveyors
Twifl ex braking systems are used on over- land coal conveyors across the globe, but some of the most demanding of these are installed in the USA. One example is on a 5° incline. Here, two spring applied, hydrauli- cally released VKSD type disc brakes are used, acting on 1in thick discs with 42in diameter to provide 77,000 lbs ft of braking torque. The VKSD is part of Twifl ex’s modular series and is a stand- ard two-module design, with the brake provided as standard with two pre-fi tted brake pads. The
brakes were supplied complete with an electro-hydraulic power pack with provi- sion for variable deceleration control. As an example of a longer conveyor, Bucim mine, Macedonia, has an installa- tion that runs to 8845ft long, transporting 5181 tons per hour. Here two VKSD disc brakes act on 1.5in thick discs of 48in diameter, providing 44,500 lbs ft of braking torque. The brakes were supplied complete with an electro-hydraulic power pack with the provision for soft braking. In a more demanding installation, VKSD disc brakes are used to provide 217,000 lbs ft of braking torque on an overland coal conveyor for Bowie Resources, Colorado. The conveyor carries a payload of 1500 tons per hour along a 2750ft conveyor with a 13.25° decline. The two VKSD brakes act on 1.5in thick discs of 56in diameter. At an installation for Mulzer Crushed Stone, Indiana, an overland conveyor car- ries 1100 tons per hour over 284ft with a 5° incline. Here Twifl ex recommended the MXSH series disc brakes, which feature a patented, compliant link mechanism to ensure uniform pad wear. The two brakes
www.solidsandbulk.co.uk Solids and Bulk Handling June 2012 23
act on 1.5in thick discs of 24in diameter, providing 4,400 lbs ft of braking torque. The supplied LC electro-hydraulic power pack offered provision for fast approach and variable deceleration control. LC power packs provide a range of standalone units with options for soft braking, a range of operating and motor voltages, and various add-on accessories including a terminal box. On an installation for Cripple Creek and Victor Gold, Colorado, requiring 35,000 lbs ft of braking torque, Twifl ex recom- mended a GMRSH type disc brake acting on a 1in thick 30in diameter disc. Here
the brakes were supplied with a Twifl ex MP electro-hydraulic power pack with provision for fast approach and decelera- tion control. MP series power packs have been designed to provide an advanced and fl exible means of brake control and to operate under the most arduous conditions, There are many other examples where
Twifl ex disc brakes are providing reliable braking on overland coal conveyors, in some of the most demanding environ- mental conditions imaginable. ■ Contact Twifl ex on tel: +44 (0) 20 8894 1161 or visit:
www.twifl
ex.com
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