Page 45 - HUB-4 Magazine Issue 82

Quarrying News
A Short Lesson in Competency
A long-term customer contacted us regarding issues with rubber screen cloths fitted to a mobile scalping screen supplied by a competitor. The customer reported that the rubber screen cloths were failing prematurely from the back and that they were struggling to tension them properly.
After investigation by phone, email and a site visit, the root cause was identified. There were two main contributing factors, namely incorrect profile side tension clamps and exterior angle wedges. These were causing the side irons to rotate, thus lifting the underside of the rubber screen cloth off the longitudinal camber bars, this was therefore not allowing the rubber screen cloths to be tensioned correctly. The incorrect tension meant the rubber screen cloths were flapping up and down, and had worn through from the underside, this movement lead to capping rubber being destroyed and to some damage to the longitudinal camber bars.
SCS undertook the rectification work on this installation, firstly repairs were carried out to the longitudinal camber bars and the exterior side angle wedges were removed. New rubber screen cloths, capping rubber and side tension clamps were installed, and for greater security the tensioning wedges and pins were replaced with screen bolts to ensure the mats remain tensioned correctly whilst in operation.
In Summary
The success of rubber screen cloths can be put down to the fact that static or mobile screens setup for side or end tensioned woven wires can be easily converted to rubber screen cloths. This is normally for one of the following reasons,
• Toimproveservicelifenormallyquotedasafivetoseven times that of woven wire, which reduces the time for maintenance, reduces the cost per tonne of production.
• Toreducepeggingorblinding,withgreaterflexibilityinthe screening surface single particles are less likely to get stuck in an aperture or lead to material binding together on top of the screening surface, this leads to a greater available open area and hence increased throughput.
• Toreducenoise,generallya10dB(A)reductioncanbe achieved.
As this case shows care should always be taken to ensure everything goes smoothly.
Speak to the experts at SCS, for unrivalled screen media expertise and individually tailored advice. Contact us on 01788 553300 or sales@scsrugby.co.uk
www.hub-4.com September/October - Issue 82
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