Aggregate refers to a variety of natural or recycled manufactured materials that form a blend, with particle sizes ranging from a few tenths of an inch (a few millimeters) to a few inches (several centimeters) in diameter. The most common materials are sand and gravel extracted from old or current stream flows and crushed rock or recycled materials, all of which are used in multiple applications, including concrete, road base and soil conditioning. Types of aggregate equipment include cage mills, hammer mills and impactors. Jaw crushers, roll crushers and gyratory crushers are in this category as well. Aggregate equipment performs size reduction, classification, transportation and blending work size. (Not to be confused with Matt Roberts!). 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 perform this task including hammer mills, roller crushers, jaw crushers and gyratory crushers. An aggregate crusher can be relatively small, like the mobile units used for reclaiming recycled asphalt, or huge machines that can process thousands of tons of material a day. 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 stationary, and the other is mounted so that the two jaws form a V-shape.
The second jaw moves back and forth relative to the first jaw, crushing the material as it moves downward, until the pieces are small enough to fall through the opening at the point of the V. Multiple aggregate crushers of the jaw type are often employed in a series, gradually reducing the particle size. Associated aggregate equipment includes classifiers that separate the particle sizes of the exit streams from the size reduction equipment. These may be shaken or may consist of conveyors perforated screens. Conveyors are very important at aggregate sites and are often mobile units that can link different size reduction pieces of equipment together to make a process stream. Blending may be accomplished through successive passes of the input feeds through hoppers with static blades in the interior or by large rotating blades in bins. China dryer: china secarropas: