Power Transmission
and methods of test). The Conti-V Pioneer is also said to be characterised by high strength and stability, minimal elongation and a long service life. In 2011, Fenner introduced a new range of ultra-high-
strength wedge belts for tough applications. Prior to launch, the Fenner Ultra Plus 140 belts were subjected to field tests in tough mining applications in Australia.
wearing woven polyester-cotton fabric that is impregnated with CR. The fabric has been woven at a specially developed angle of warp versus weft, rather than the traditional 90-degree weave.
Cutting costs
Ultra Plus 140 wedge belts are designed to be used in three-, four-, five-, six- or eight-groove pulley drives, either in new installations or to upgrade existing equipment. In new installations the belts can contribute to reduced drive costs, as their higher power rating permits the use of fewer belts without compromising the drive life. For existing drives, fewer belts need to be purchased and fitted to existing pulleys. Either way, there is a significant cost saving. These larger-section Fenner wrapped wedge belts
are designed to drive large rotating plant such as pumps, conveyors, fans, crushers and separators typically used in quarrying, mining, processing, aggregates, the power industry and waste recycling sectors. Individual Fenner Ultra Plus 140 belts are rated at 22 kW and above but, in multiples, they can transmit up to 900 kW. The Industrial Power Transmission unit of Gates
Corporation recently added more industrial moulded notch V-belts to its range, with the new products benefiting from the use of EPDM (ethylene propylene diene monomer) rubber to give a longer operating life at extreme temperatures, greater efficiency and smoother running.
Fig. 4. The Contitech Blueconcept Conti-V Pioneer wrapped V-belt is manufactured using vegetable oils, mineral fillers, chalk and cotton yarn - and contains no carbon black.
Fenner is offering the Ultra Plus 140 in two cross-section sizes, namely the SPB (16 x 13 mm) and the SPC (22 x 18 mm), and in lengths from 2.8 to 10 m. Both belt sections employ the very latest in materials and construction technology, bringing what is essentially a 60-year-old design up-to-date. The belts are named after their enhanced transmission capacity, having 140 per cent of the power rating of regular Fenner Power Plus PB wedge belts. The inner load-bearing cords are made from aramid fibre, which is the same material used in Kevlar. The aramid cords are surrounded by chloroprene rubber (CR) to provide greater wear life than regular compounds, and this rubber is said to be more resistant to heat, oils and chemical exposure, as well as providing improved electrostatic conductivity performance (Fig. 5). Similar to other belt drive systems, the CR affords a degree of protection against shock loads. The Ultra Plus 140 belts are double-wrapped in a hard-
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Fig. 5. Fenner is offering the Ultra Plus 140 V-belts that feature inner load-bearing cords made from aramid fibre, chloroprene rubber and specially woven polyester-cotton fabric.
When the new belts were launched, Gates said it was the first manufacturer to incorporate EPDM in industrial V-belts. The belts’ bandless, moulded notch construction provides an improvement in energy efficiency of up to three per cent, and the belts are also better at tolerating misalignment for smoother running. The operating temperature range is also said to be 70 per cent broader. When customised belts are required, specialist companies
can modify standard products to order. One such company is Transmission Developments (Transdev), which is a UK-based distributor for manufacturers such as Continental Contitech,
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