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Aggregate crushers grind or pulverize various types of rock into small, uniform pieces. Types include hammer mills, roller crushers, jaw crushers, and gyratory crushers. Each type is used in mining, quarrying, and recycling operations to process materials.
An aggregate crusher is a machine designed to grind or pulverize various types of rock into small, relatively uniform pieces. Aggregate crushers are used in mining, quarrying and recycling operations. Several types of crushers can accomplish this task, including hammer mills, roller crushers, jaw crushers, and gyratory crushers. An aggregate crusher can be relatively small, such as the mobile units used to recover recycled asphalt, or huge machines capable of processing thousands of tons of material per day.
Hammer mills are machines with a rotating shaft equipped with oscillating hammers. This group is enclosed by a drum and fed by a hopper. A screen holds the material inside the drum until the rotating hammers pulverize it into pieces of the desired size. These types of aggregate crushers are commonly used to produce crushed stone for landscaping or to process recycled asphalt. Hammer mills are sometimes known as impact crushers.
Jaw crushers are the aggregate crushers that are most often employed in large mining or quarrying operations. A jaw crusher is designed to crush large pieces of ore or rock between two plates or jaws. One jaw is fixed and the other is mounted so that the two jaws form a V shape. The second jaw moves back and forth in relation to the first jaw, squeezing the material as it moves downwards, until the pieces they are small enough to drop through the opening at the point of the V. Multiple jaw-type crushers are often employed in a series, gradually reducing the particle size.
Another type of crusher used to pulverize softer types of rock such as sandstone is the roller mill. The rock blanks are fed into a mechanism consisting of rollers which usually have teeth that engage with the teeth of an opposing roller as they rotate. These teeth grab the pieces of rock to be crushed and push them between the rollers where they are crushed and brought out the other side.
Gyratory crushers are also used as aggregate crushers. These types of crushers are similar to jaw crushers, but employ a cone-shaped hopper with a smaller cone-shaped crushing head that rotates around inside the hopper in an eccentric motion rather than rotating, crushing the feedstock until the particles are small enough to fall through the opening at the bottom. Cone crushers are very similar to gyratory crushers, but the crushing chamber is usually designed with less sloped sides.
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