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, 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.
For the most part advances in crusher design have moved slowly. Jaw crushers have remained virtually unchanged for sixty years. More reliability and higher production have been added to basic cone crusher designs that have also remained largely unchanged. Increases in rotating speed, have provided the largest 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 cone 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 in the use of hydraulics to protect crushers from being damaged when uncrushable objects enter the crushing chamber. Foreign objects, such as steel, can cause extensive damage to a cone crusher, and additional costs in lost production. The advance of hydraulic relief systems has greatly reduced downtime and improved the life of these machines.
2) The series jaw's type crusher(the jaw breaks) is theer most suitable proper than broken up compression strength to be no higher than various soft hard ore with 300 MPas(tera Pa), being fallen in pieces the biggest mass degree anti of supplies must be bigger than technique parameter, table state.
Choosing the right crusher starts with choosing the right crusher manufacturer. Shanghai Xuanshi Machinery Co., Ltd. is one of the largest mining crusher machine manufacturers in China. Established in 2002, we have a wealth of experience in helping customers select the right crushing equipment for every application. Focusing on providing unique, cost-effective solutions for any size reduction challenge, we have supplied superior stone crushers, sand machines and grinding mills to numerous customers worldwide. As a result of our consistent quality and complete services, we at Xuanshi Machinery have been awarded ISO9001:2008 Certificate and Global Manufacturer Certificate.
Our company is located in Shanghai, where we have access to convenient sea, land, and air transportation. This facilitates the transport of stone crushers and reduces shipping costs for our customers.
Shanghai Xuanshi Machinery Co., Ltd.
Add: No.60, Jinwen Road, Airport Industrial Park, Pudong Area, Shanghai, China
P.C.: 201323
Tel: 0086-21-33759856
Fax: 0086-21-33908325
Email: xsm.cn@xsmach.com
Website: http://www.chinacrushermanufacturer.com