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Conveyor chains for heavy materials or large scraper chains are subject to substantial wear and tear if they run, steel on steel, in a guide rail. Friction can be significantly reduced with the standard rollers according to DIN 8166. However, that may sometimes not be enough. In such cases the chain pins, for example, are extended to the outside and a roller made of hardened steel on roller bearings is mounted. Now the rollers run on the guide rail, the chain itself is clear. As a result the operating time of the conveying elements increases considerably, the noise emission is drastically reduced and the required drive power drops by up to 50 %.

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