A crusher may be a machine designed to scale back large rocks into smaller rocks, gravel, and sand or rock dust. Crushers could also be wont to reduce the dimensions , or change the shape , of waste materials in order that they are often more easily disposed of or recycled, or to reduce the dimensions of a solid mixture of raw materials (as in rock ore), in order that pieces of various composition are often differentiated. Crushing is that the process of transferring a force amplified by ratio through a cloth made from molecules that bond together more strongly, and resist deformation more, than those in the material being crushed do. Crushing devices hold material between two parallel or tangent solid surfaces, and apply sufficient force to bring the surfaces together to urge enough energy within the fabric being crushed so that its molecules break away (fracturing), or change alignment in reference to (deformation), one another . The earliest crushers were hand-held stones, where the load of the stone provided a lift to muscle power, used against a stone anvil. Querns and mortars are kinds of these crushing devices.
Types of crushers
Technology
For the foremost part advances in crusher design have moved slowly. Jaw crushers have remained virtually unchanged for sixty years. More reliability and better production are added to basic cone crusher designs that have also remained largely unchanged. Increases in rotating speed have provided the most important variation. For instance, a 48-inch (120 cm) cone crusher manufactured in 1960 may be able to produce 170 tons/h of crushed rock, whereas the same size crusher manufactured today may produce 300 tons/h. These production improvements come from speed increases and better crushing chamber designs.
The largest advance in cone crusher reliability has been seen within the use of hydraulics to guard crushers from being damaged when uncrushable objects enter the crushing chamber. Foreign objects, like steel, can cause extensive damage to a cone crusher, and extra costs in lost production. The advance of hydraulic relief systems has greatly reduced downtime and improved the lifetime of these machines.
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