Cone Crusher VS Gyratory Crusher
Both cone and gyratory crushers have an oscillating shaft. The material is crushed in a crush- ing cavity, between an external i xed element (bowl liner) and an internal moving element (mantle) mounted on the oscillating shaft assembly.
An eccentric shaft rotated by a gear and pinion produces the oscillating movement of the main shaft. The eccentricity causes the cone head to oscillate between o.s.s. (= open side setting) and c.s.s. (= closed side setting) discharge opening. In addition to c.s.s., eccentricity is one of the major factors that determine the capacity of gyratory and cone crushers.
The fragmentation of the material results from the continuous compression that takes place between the liners around the chamber. An additional crushing ef ect occurs between the compressed particles, resulting in less wear of the liners. This is called interparticular crushing also.
The gyratory crushers are equipped with a hydraulic setting adjustment system, which adjusts c.s.s. and thus af ects product gradation.
Depending on cone type, setting can be ad- justed in two ways. The i rst way is for setting adjustment to be done by rotating the bowl against the threads so that the vertical position of the outer wear part (concave) is changed. One advantage of this adjustment type is that liners wear more evenly. Another principle is that of setting adjustment by lifting/lowering the main shaft. An advantage of this is that adjustment can be done continuously under load.
To optimise operating costs and improve the product shape, as a rule of thumb it is recommended that cones always be choke-fed, meaning that the cavity should be as full of rock material as possible. This can be easily achieved by using a stockpile or a silo to regulate the inevitable l uctuation of feed material flow. Level monitoring devices detect the maximum and minimum levels of the material, starting and stopping the feed of material to the crusher, as needed.
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