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Personne àcontacter Ms. Chelsie
East side of Zhengxin Road,Guodian Industrial Zone,Airport District, Zhengzhou, Henan
Jintai*9
A crusher is a machine designed to reduce large rocks into smaller
rocks, gravel, or rock dust. Crushers may be used to reduce the
size or change the form or waste materials so they can be more
easily disposed of or recycled, or to reduce the size of a solid
mix of raw materials (as in rock ore), so that pieces of different
composition can be differentiated. Crushing is the process of
transferring a force amplified by mechanical advantage through a
material made of 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 generate enough energy within the material being
crushed so that its molecules separate from (fracturing), or change
alignment in relation to (deformation), each other. The earliest
crushers were hand-held stones, where the weight of the stone
provided a boost to muscle power, used against a stone anvil.
Querns and mortars are types of these crushing devices.
In industry, crushers are machines which use a metal surface to break or compress materials. Mining operations use crushers, commonly classified by the degree to which they fragment the starting material, with primary and secondary crushers handling coarse materials, and tertiary and quaternary crushers reducing ore particles to finer gradations. Each crusher is designed to work with a certain maximum size of raw material, and often delivers its output to a screening machine which sorts and directs the product for further processing. Typically, crushing stages are followed by milling stages if the materials need to be further reduced. Crushers are used to reduce particle size enough so that the material can be processed into finer particles in a grinder. A typical circuit at a mine might consist of a crusher followed by a SAG mill followed by a ball mill. In this context, the SAG mill and ball mill are considered grinders rather than crushers.
In operation, the raw material (of various sizes) is usually delivered to the primary crusher's hopper by dump trucks, excavators or wheeled front-end loaders. A feeder device such as an apron feeder, conveyor or vibrating grid controls the rate at which this material enters the crusher, and often contains a preliminary screening device which allows smaller material to bypass the crusher itself, thus improving efficiency. Primary crushing reduces the large pieces to a size which can be handled by the downstream machinery.
Some crushers are mobile and can crush rocks (as large as *0 inches). Primarily used in-pit at the mine face these units are able to move with the large infeed machines (mainly shovels)to increase the tonnage produced. In a mobile road operation, these crushed rocks are directly combined with concrete and asphalt which are then deposited on to a road surface. This removes the need for hauling over-sized material to a stationary crusher and then back to the road surface.
