Free Coupling Guide for Mining Engineers


Renold Hi-Tec Couplings of Halifax, UK, has published a free pdf guide on the use of rubber-in-compression couplings on a wide range of mining and quarrying applications.  The guide is the first in a newly launched series of Info.Base publications designed to assist engineers with many of the day-to-day issues associated with power transmission systems on industrial plant, equipment and machinery.  The Info.Base guides share Renold's specialist engineering knowledge and expertise on couplings and gears, and include useful and practical how-to style tips and informative application-based content.

The first of the new Info.Base guides, titled 'Coupling Solutions: Rubber-in-compression, addresses issues such as; backlash, extreme vibration, safety, reliability, how to cut maintenance and how to reduce lifetime operating costs in mines and quarries.  It explains the common causes of a wide range of problems, such as torque amplification and motor hunting on inclined conveyors, then shows how rubber-in-compression can provide the solution.

Rubber-in-compression couplings are comprised of two round, metal sections fitting one inside the other with what looks like the paddles of a paddle steamer projecting inwards from the outer section and outwards from the inner.  Rubber blocks are placed in the spaces in between the paddles and as the outer section is turned by the motor, it drives the inner section through the rubber blocks.  As this happens the rubber is compressed, hence the term 'rubber-in-compression.'

When rubber is loaded in compression it behaves as an incompressible fluid and is inherently strong and robust.  Rubber-in-compression couplings are intrinsically fail-safe because even if the impossible happened and the rubber blocks were destroyed, the strong metal paddles would come together to provide the drive.