Advantages of a Jaw Crusher

A jaw crusher is a machine that reduces large chunks of rock into smaller pieces. The jaws of the crusher open and close in a cycle, crushing the material between them. This process continues until the particle size is small enough to pass through the opening at the bottom.
The jaws are supported in removable, water-cooled babbitted bearings. This allows them to be removed without stripping the frame.
Versatility
A jaw crusher is a versatile machine that can be used to crush different kinds of materials. It is able to process large and medium-sized rocks with ease. In addition, it can be easily adjusted to regulate the final size of the crushed material. This helps to minimize the amount of fines that are produced by the machine.
The size of the gap between the jaw plates determines the final sample size. The gap opens when the jaws are at rest, then closes during the upstroke of the eccentric. During this cycle, the movable jaw constantly approaches and leaves the stationary jaw. This causes repeated squeezing and crushing of the material, causing the particles to fracture and become smaller.
Both gyratory and jaw crushers can be made to handle very tough material by strengthening the design. This usually involves selecting stronger metals and adding weight in the frame. However, this will also increase operational costs and lead to additional staffing requirements.
Low Maintenance
The jaw crusher's simple structure makes it easy to maintain and repair. Heavy bronze bearings are sealed against dust and dirt, and lubricated with grease cups to make greasing tools unnecessary.
The movable jaw of the jaw crusher is moved by an eccentric shaft, and the material crushed is forced into a wedge-shaped pit between the fixed and moving jaw plates. This process continues until the material is smaller than the set crushing gap.
Unlike impact crushers, the jaw crusher doesn't pulverise the material, but rather breaks it into smaller particles by applying pressure. This lowers maintenance requirements and allows for less downtime.
Cost-Effective
Often, the choice of crushing technology is influenced by cost-effectiveness. For instance, a jaw crusher is an economical solution for hard, tough materials and is particularly suitable for quarrying natural stone types.
The basic principle of operation is simple: two hard-faced heavy plates or jaws crush particles between them. A motor-driven jaw moves up and down in an elliptical course of movement, continuously crushing the material until it is smaller than the set crushing gap. Then the crushed material falls through the bottom opening and is discharged by gravity.
The optimum speed of the jaw is determined by the required final size and properties of the sample, as well as the feed characteristics. The speed of the jaw plate can be varied by widening or narrowing the gap between the jaws. The angular position of the jaw plate can also be adjusted, reducing particle breakage and wear. The angle h of the jaws should be less than 26°, to avoid uncrushable material entering the chamber.
Easy to Operate
The jaw crushers are designed for easy operation. They have large bearing surfaces and are carried in water-cooled, babbitted shafts. This reduces wear and eliminates the need for glands that require frequent replacement.
The size of the discharge port can be easily adjusted by a hydraulic cylinder at the bottom of the movable cone. This also serves as iron-over protection and helps ensure that no unbreakable materials are trapped in the crushing chamber.
The nip angle (angle between the swing and fixed jaw plates) has a direct effect on capacity, since the particles are compressed in successive wedges down the crushing chamber until they reach the bottom. This can be altered to achieve the desired result by changing the gap width between the jaw plates. The curved jaw plates have been found to be more effective than straight ones, since they reduce the tendency of the material to pack and cause premature wearing. This enables a lower nip angle with the same crushing power.