Stone Crushing Machine are used to break large rocks into smaller pieces

Crushing machines are used to break large rocks into smaller pieces. They can be mobile or fixed. A crushing setup usually includes conveyors to feed the material into the machine, primary and secondary crushers and screeners.
Up to the present time, the breaking of stone for macadam roads has been an occupation reserved to convicts and tramps. This machine is a variation of the usual lever pattern.
Impactors
Impact crushers use impact rather than compression force to reduce the size of rock and stone. They are ideal for producing specification aggregates in a range of applications including concrete manufacture and modern Superpave highway asphalt.
The material to be crushed is fed into the center of a closed rotor. This rotor rotates at high rpm, accelerating the feed and throwing it with a great deal of energy against an outer anvil ring assembly. The impact breaks the stone into smaller pieces and produces a consistent cubical shape. The rotor speed (feet per minute) controls the final particle size.
Fixed crushing plants are often located at a quarry. These require significant setup time and are often expensive to move from one site to another. Wheeled and mobile crushing plants can maintain proximity to the source of raw material, decreasing loading times, fuel consumption, wear on equipment, and downtime. They are also more easily replaced in the event of a failure.
Jaw Crushers
Jaw crushers are heavy duty machines which are used for crushing rocks and stones. The stone is crushed into small particles by applying constant pressure between the fixed and movable jaws of the machine. This stone crushing machine is widely used in construction industries, mining industries, roads, railways, water conservancy projects and many other sectors for reducing the size of large rock into smaller rocks, aggregates, sand and gravels.
The jaws are swung through the gyrating action of an eccentric shaft. The shaft is suspended from a flywheel (not shown). The swinging movement of the jaws is controlled by two toggle plates.
The jaw frames have a sectionalized design to facilitate handling and installation. End members are cast steel of box section design, reinforced by steel ribbing. The frame is deep welded and stress relieved to eliminate failure adjacent to welds. This helps in increasing the life of the machine and also provides a more uniform wear of the crushing chamber.
Cone Crushers
Using compression force, Cone Crushers break material by crushing it between two solid surfaces. This process is used in a variety of industries including concrete, aggregate, mining and coal.
Inside the crusher, a piece of steel called the mantle rotates and crushes material against a stationary piece called the bowl. The gap between these parts can be adjusted by raising and lowering the upper casing. This varies the size of the finished product.
The gap between the mantle and the cone is wider at one end than it is at the other, which allows smaller rocks to pass through. The closed side setting can be adjusted by a hydraulic piston to optimize particle size and load. The crusher is also equipped with a spring release system that prevents it from being damaged by uncrushable objects. These systems reduce downtime and increase reliability. They are ideal for medium to hard abrasive rock.
Roll Crushers
Roll Crushers are cylinders between which material is drawn and crushed by compression. They are fitted with their faces a certain distance apart, which will vary according to the degree of fineness desired, and are so driven as to be capable of gripping without slippage the material entering them.
For coarse crushing they are best adapted, while for the more finely-crushed product they may be worked in closed circuit with screens wherever control of maximum particle size leaving them is important. In such a case the ridging or grooving of their faces is not advisable, as it will permit a considerable proportion of material to pass between the rolls without being crushed.
The power required to drive them varies in direct relation to the size of feed and the reduction ratio; it is also affected by the hardness and toughness of the material being crushed. The permissible reduction ratio for light rolls is much lower than for heavier ones.