Rock Products

APR 2018

Rock Products is the aggregates industry's leading source for market analysis and technology solutions, delivering critical content focusing on aggregates-processing equipment; operational efficiencies; management best practices; comprehensive market

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Page 40 of 67 ROCK products • April 2018 • 39 a mechanical tensioner to reduce drag at start-up, which reduces the cleaner's performance if it's not correctly re-ad- justed afterward. In contrast, pneumatic tensioners have some advantages vs. mechanical construction. The air tensioner keeps the blade in contact with the belt. For linear adjustment the air tensioner maintains a constant force on the blade that results in a constant cleaning pressure. However, with radial tensioning the pressure must be reduced as the blade wears to keep constant cleaning pressure. For sites without available electricity, systems are available that can actually be engineered to generate their own power from the moving conveyor belt, creating the energy to run a small compressor and store the pressurized air in a reservoir tank to maintain constant blade tension. One automated pneumatic tensioning system engineered for belt cleaner applications is now delivering precise mon- itoring and tensioning throughout all stages of blade life, extending the effective service life of both the cleaner and the belt. Also equipped with sensors to confirm that the belt is loaded and running, the system automatically backs the blade away during stoppages or when the conveyor is running empty, minimizing unnecessary wear to both the belt and cleaner. The result is consistently correct blade tension, with reduced power demand on start-up, all managed without operator intervention. Automatically tensioning cleaners also delivers a significant savings in labor hours, allowing personnel to concentrate on core business activities. Installation A critical ingredient in the performance of any belt-clean- ing system is its installation. Improper installation will have an adverse effect on how well the cleaner works, reducing both blade life and cleaning efficiency. Most performance problems with belt cleaner systems are due to improper installation, lack of maintenance or both. Considerations affecting the installation position of a belt cleaner include: • Cleaner design. • Tensioner and mounting requirements. Figure 4: Constant Cleaning angle and Pressure. Figure 5: Automatic cleaner tensioning uses pneumatic power to maintain correct, consistent blade pressure.

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