JAW CRUSHERS
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CRUSHER INFORMATION
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COMMON CRUSHER TERMS, TYPICAL REDUCTION RATIOS

 GENERAL JAW CRUSHER INFORMATION

CRUSHING PLANT DESIGN



 
Crusher Terminology, crushing type, and reduction ratio

Cone crusher: A crusher that breaks material by squeezing or compressing it between a convex and concave shaped surfaces covered by manganese as the wear surface. Normally used as the second or third stage crusher. Uses compression to crush. Reduction ratio is 6-8 to 1.

Double impeller impact breaker: Operates much in the same method as a single impeller, with counter-rotating (two) impellers which not only impel the material against the breaker bars, but also impel material high inside the chamber to be fractured on other incoming feed. Uses impact to crush material. Reduction ratio is 20 to 1.

Double roll crusher: A crusher that breaks material by squeezing it between two revolving metal cylinders, with axes parallel to each other and separated by a space equal to the desired size of the finished product. Uses compression to crush material. Reduction ratio is 2 to 2.5 to 1.

Gyratory crusher: Crusher with a central conical member having an eccentric motion in a circular chamber tapering from a wide top opening.

Hammermill: A rock crusher that employs hammers or flails on a rapidly rotating axis. The hammers are usually made of manganese. Uses impact and attrition to crush material. Reduction ratio is 20 to 1.

Jaw crusher: A crusher that breaks material by squeezing or compressing it between two jaw plates, one moveable and one stationary. Normally used as a primary crusher. Uses compression and some attrition to crush material. Reduction ratio is 6 to 1.

Primary crusher: First-stage crusher used to reduce larger rock to a size that can be processed by secondary or tertiary crushers.

Secondary crusher: Crusher that receives feed from the primary crusher, further reducing rock in size.

Short head (Fine cone) crusher: A second- or third-stage crusher used to make product generally 1/8-inch to one inch in diameter. Because of the longer final crushing zone it tends to make more fines than a standard cone crusher. It also has a smaller feed opening than a standard cone crusher. Uses compression and a long uniform final gap to crush material. Reduction ratio is 4-6 to 1.

Standard cone crusher: Normally the secondary, but sometimes the primary crusher, for further reducing rock. Because its smallest discharge gap is short the gradation produced is more evenly distributed and it does not make as high a percentage of fines as a shorthead cone. It has a larger feed opening than a shorthead (or fine cone). Uses compression to crush material. Reduction ratio of 6-8 to 1.

Single impeller impact breaker: A crusher in which the incoming feed drops vertically through the chamber, strikes rotating impeller bars and is then impacted against breaker bars within the chamber. Due to this severe impacting of material, a single impeller impact breaker realizes up to a 20 to 1 reduction ratio. Uses impact to crush material.

Tertiary crusher: Crusher that receives feed from the secondary crusher, further reducing rock in size. Often used to make fines or manufactured sand.

Vertical shaft impactor: A crusher whose main mechanism rotates around a vertical axis. The rock is fed into the crusher and impacted or thrown by a table/ anvil configuration or anvil ring, and is crushed by impact either by manganese wear plates or rock-on-rock strikes. Often used to make fines or manufactured sand. Uses impact to crush materials. Reduction ratio of 4-8 to 1.


For more information on different crushers go to www.conquip.us/crusher_information

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