Fig. 1. Belt cleaners prevent material from remaining on the belt after it leaves the transfer point. // Bild 1. Bandabstreifer sorgen dafür, dass nach dem Übergabepunkt kein Schüttgut am Band haften bleibt. Photo/Foto: Flexco Europe GmbH

Keeping a cool head

Underground mining conditions can be extreme for man and machine – and high temperatures are just one of the challenges to be overcome. Flexco Europe GmbH, Rosenfeld/Germany, offers conveyor belt system operators special solutions that can safely withstand the heat, including various blades for precleaners that still work reliably at 230 °C (Figure 1). Dust and gases can cause explosions underground, so Flexco designs the precleaners to comply with ATEX if required.

“Extreme conditions can prevail in underground mining”, describes Jonas Zahn, Product Manager Heavy-Duty at Flexco. “In some mines and galleries it’s as hot as in the desert.” The manufacturer is a leading international supplier of mechanical conveyor belt fastener systems, belt cleaners, belt trainers, impact beds and pulley lagging used by companies in a wide range of industries, including the mining sector.

Flexco has developed various cleaner blades for the precleaners and secondary cleaners of the EZP1 and MSP series, enabling operators to react to the often extreme temperatures – and not only in the minus range. Operators have access to various polyurethane versions, including a bright yellow variation for high temperatures. It allows continuous operation up to 135 °C and up to 163 °C for short periods. There is also a deep red ultra-high-temperature cleaner blade, which performs reliably at peaks of up to 230 °C. “Belts can be exposed to such high temperatures when transporting coal, clinker or cement,” reports Zahn.

If dust or mine gas also occurs at these hot temperatures in underground mining, there is an increased risk of explosion. To avoid endangering the work safety of employees, manufacturers must design their machines, systems and components to comply with ATEX. ATEX? “It’s an abbreviation that stands for ATmosphère EXplosible,” explains Zahn. ATEX is also the abbreviation of the European Directives 94/9/EC (ATEX 95) and 1999/92/EC (ATEX 137) for the marketing of explosion-protected electrical and mechanical equipment, components and protective systems. “We document all the relevant standards for the installation and operation of explosion-protected equipment in our Declaration of Conformity,” explains Zahn.

In addition to the scrapers of the EZP1, MSP and MMP series, Flexco also designs the H and R types as well as the MHS ATEX-compliant series. Many safety measures have been incorporated in these designs to provide the greatest possible degree of work safety. The EZP1 cleaner, e. g., can be easily attached to the conveyor belt or feed station using universal mounting plates. “However, it can only be mounted on a grounded conveyor structure,” adds Zahn. This is because Flexco manufactured this component from conductive material. Flexco has documented in detail for its customers how the user can ensure grounding and how he can attach the cleaner to the supporting structure.

Further information:
Flexco Europe GmbH