Comment
Author: Admin | 2025-04-28
Of the side frames and tensioning bars onto the screen area. FEEDERSFeeders are used in several quarry applications, from transferring material to crushers, screens and conveyors at a regulated rate from bins or stockpiles to protection of other equipment from impact loads.Most quarry operators will be familiar with the primary feeder, which moves the run of quarry material into the primary crusher. In small applications, these can be heavy duty vibrating screens fitted with punched plate decks, but more often these machines are specifically designed vibrating feeders, belt or apron feeders or reciprocating plate feeders. There are also less common machines such as bar, roll and chain feeders. This paper will only discuss the more common units.Vibrating feedersVibrating feeders vary from lightweight, electromagnetically driven units such as the Syntron type through similar machines (but of heavier construction) to vibrating screens to heavy duty machines with gear-driven vibrating mechanisms. Applications for these units are as varied as the machines themselves. Lighter units are used under bins or stockpiles to regulate the discharge of materials onto conveyors or into secondary subsequent crushing stages, whereas the heavier machines are employed as primary crusher feeders.The heavier feeders have a full deck of grizzly bars or may have a grizzly bar discharge section incorporated at the discharge end of the pan to remove finer material before it enters the crusher.All units have a variable speed control to regulate the feed rate, although fixed speed drives are used as a cost-saving exercise. This can limit the versatility of the machine and lead to stop-start operation rather than regulated feed. The feeders can be used for most materials, although wet and sticky feeds can cause problems due to packing.Apron feedersApron feeders have a heavy duty fabricated steel frame supporting overlapping steel or cast manganese pans mounted on heavy ?caterpillar? chains operating on rails or rollers. The drive for this feeder is achieved by a variable speed hydraulic motor. These feeders are the most robust of the common feeders and used for conveying heavy, lumpy or abrasive materials. They will handle wet and sticky feeds but can create a build-up of fines under the machine, both from material filtering through the gaps between pans and from sticky materials falling off the return side of the feeder. Apron feeders are often seen in primary feeder applications, although they have also been used as stockpile feeders in heavy duty applications.Belt feedersBelt feeders are similar to belt conveyors, albeit of heavier construction. The belt is flat(across the width) but may have a slight trough. The heavy duty rubber belt is carried on closely spaced carrying rollers.Belt feeders are selected for smoothness of operation and can handle most materials except those containing very large lumps. They are good for sands and finer fraction materials.Reciprocating plate feedersReciprocating plate feeders consist of a steel pan supported on rollers and driven in a reciprocating motion. They are seen as a lighter weight (and cheaper) alternative to vibrating pan feeders in smaller applications. They have a
Add Comment