MechChem Africa December 2019/January 2020

⎪ Power transmission, bearings, bushes and seals ⎪

New to BMG’s extensive range of Tsubaki cam clutches, is the recently launched BS-F series; designed for high-speed inclined and long overland belt conveyors and bucket elevators, which are used in the mining and bulk handling sectors. Cam clutches for mining and bulk handling sectors

New to BMG’s

S outh Africa’s Mine Health and Safety Act states that the installation of incline conveyor belts must include the fitting and use of one or more devices that prevent run-back or run-on, to avoid injury by materials or minerals falling from a conveyor belt. Tsubaki backstop cam clutches are de- signed to prevent reverse rotation of drive shafts - in high or low speed applications - of- fering a simple and cost-effective means to protectcapitalequipmentandenhancesafety. “The newhigh-torque, high-speedTsubaki BS-F series, with a narrow width I-beam torque arm, is a drop-in replacement to conventional anti rollback devices. This al- lows quick and easy on-site installation, and enables the replacement of an old backstop with thenewBS-Fdesignwithout theneed for modificationtotheexistinglayout,”saysGavin Kirstein, national Tsubaki product specialist, BMG. “Although this series is narrow inwidth compared to other models, the downsized unit exceeds the requirements of high-speed

extensive

inclined belt conveyors, with the benefits of space-saving and reduced installation times.” Kirstein explains that a common cause of conventional backstop failure is oil leakage. Tsubaki has eliminated this risk in thenewBSF series by designing the backstop to operate withgrease anda speciallydesigned labyrinth seal. Henotes theabsenceof anoil level gauge creates a more reliable safety device. Other important features of the series include a non-rollover cam and roller design, which offers higher backstop torque ca- pacities and lower running temperatures than conventional anti rollback devices. Added to this, a flexible labyrinth seal mechanism prevents the ingress of dust and water in abrasive conditions, while a double-lip oil seal and multi-temperature grease enable safeoperationat awide ambient temperature range of - 40°C to + 65°C. The camand roller cageorbit at lowspeed, continually conveying grease internally from the bottom to the top of the mechanism. The constant circulation of grease minimises in-

range of Tsubaki cam clutches is the recently launched

BS-F series.

ternal friction and reduces operating temper- ature for dependableoperation.Maintenance intervals are between 7 500 hours and 8 000 hours and theeffective service lifeof theunits is also significantly extended compared with conventional oil-filled units. BMG’s technical team conducts full plant surveys and advises on the selection of the correct cam clutch for each application and the appropriate installation and usage, for optimum performance and improved safety standards. Apart from the mining sector, BMG’s cam clutches are used for belt conveyors for materials handling, metals, timber, pulp and wood chip, as well as for bucket elevators for cement and grain. These units are also installed to enhance performance of large drift conveyors and screw pumps. q

December 2019-January 2020 • MechChem Africa ¦ 15