MECHANICAL COMPONENTS APPLIED TECHNOLOGY SKF delivers its largest sealed spherical
roller bearing to a Peruvian customer SKF’s Gothenburg factory has produced the company’s largest sealed spherical roller bearing (SRB) to date. The ‘241/900’ SRB, produced for a copper mine in Peru, is 50 per cent larger and three times heavier than the previous largest SKF sealed SRB
APPLE PRESS REFURBISHMENT D
When Suffolk cider maker Aspall Cyder – one of Britain’s oldest family-run businesses – required three essential elements of its apple-milling process to be overhauled, they turned to Gibbons Engineering Group to deliver the whole project. Aspall, wanting to maintain the efficiency and reliability of the apple mill, commissioned food and beverage experts Gibbons to refurbish the electric motor, auger and gearbox, and to replace the milling tool. The unique nature of the equipment meant that Gibbons needed to design and manufacture a one-off stainless steel lifting frame to assist in its removal. Once this had been carried out and the equipment transported to Gibbons’ workshop, new bearings were fitted to the motor and auger while the gear oil was changed. The project included the re-painting of equipment and the supply of food- safe bearing grease before all the components, including the new milling tool, were returned to site and reinstalled with new gaskets.
Gibbons
www.gibbonsgroup.co.uk
estined for a Polysius Polycom 8 roller press at a large copper
mine in Peru, the three-tonne 241/900 sealed SRB is dimensionally equivalent to a standard SKF non- sealed version, with inner diameter (bore) of 900mm, outer diameter of 1,420mm and width of 515mm. The seal itself consists of a rubber over- moulded steel plate with the same profile, offering the same characteristics as those currently used with existing SKF sealed SRBs. The customer’s sealed SRB will be fitted to a horizontal shaft and will operate in extremely dusty conditions, with very fine stone dust from both the desert location itself and the grinding processes, posing a major contamination risk. The roller press is a highly loaded application (C/P of 2-3) subject to frequent shock loading; the predominantly radial loads, when coupled with the high level of contamination at the site, poses a significant risk of early bearing failure. SKF’s custom-made seal aims to at least double the bearing service life by reducing the
risk of contamination in this application significantly. The actual performance of the seal for this size of SRB remains to be verified in service by the customer, but the same seal design used in smaller SRB sizes has achieved a service life of at least double that of an open, non-sealed bearing. Even longer service lives of around three to five times that of a non-sealed bearing can be achieved with SKF’s ‘three-barrier’ bearing protection solution, which comprises premium SKF sealed SRBs, housed within sealed housings containing a barrier grease. This record breaking sealed SRB was
designed and manufactured within a tight, six month schedule by a team led by project manager Daniel Ortega.
SKF T: 01582 496433
www.skf.com
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