What is a Crusher?
A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, sand or rock dust.
Crushers may be used to reduce the size, or change the form, of 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.
How to choose a crusher?
There are several characteristics to consider-
- The abrasiveness and hardness factor:
It is essential to know what material is going to be crushed, in particular its abrasiveness and hardness. You must evaluate the compressive strength or maximum force that the material can withstand before breaking.
- The dimensions:
You will need to consider the maximum dimensions you need to enter into the machine (length, width and thickness).
- Granulometric requirement:
It is necessary to define the desired result i.e. the grain size after crushing.
- The capacity (throughput):
You will need to determine the processing capacity (or throughput) necessary for your use. This is measured in tonnes/hour.
You can then look at the main technologies for crushers on the market:
- Jaw crushers
- Cone crushers
- Impact crushers, also known as hammer crushers
- Mobile Stone Crushers.
What is Mobile Stone Crusher?
Mobile stone crusher are specialised mining and excavation equipment used in open pit mines, designed for three main purposes, for crushing material, screening/sorting material and conveying material to its destination at the mining site. This material might be rock, sand, soil, earth, limestone, gravel, coal, aggregate etc. They work by applying strong compressive force against the material through a pair of jaws, one stationary fixed jaw and one moveable jaw. The material is fed through a V-shaped crushing chamber into the jaws, where the exit at the bottom is narrower than the opening at the top.
Application of mobile stone crusher:
Mining operations use mobile stone crushers by Etrack 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 mobile stone 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. As well as size, machines designed for each of these stages must take into account the basic methods of material size reduction; impact, compression, attrition, and cutting. Depending on the material properties and desired outcome some methods of crushing and thus machine designs may be more appropriate for the use case.
Mobile Stone Crushers can crush rocks as large as 1.5 meter (60 inches). Primarily used in-pit at the mine face these units 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 onto a road surface. This removes the need for hauling oversized material to a stationary crusher and then back to the road surface.
Conclusion
Mobile stone crushers are one of the most widely used and hence most popular kind of crushers in the industry.
