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How jaw crushers function in the crushing process: A simplified diagram

Jaw crushers are quite versatile machines that are widely used in the crushing process. They are engineered for reducing large rocks and ores into smaller ones by breaking them down under pressure. The crushing principle is achieved by the movement of the swing jaw against the fixed jaw, which results in a reduction in material size.

Jaw crushers have a fixed jaw and a movable jaw. The movable jaw is called a swing jaw because it moves up and down in a reciprocating motion. Jaw crushers are powered by a motor, and the movable jaw moves up and down via eccentric shaft. The angle between fixed jaw and movable jaw becomes smaller when the moving jaw runs down, then the materials are crushed into pieces. Jaw crushers are used as both primary and secondary crushers, depending on the nature of the material they are reducing.

In a typical jaw crusher, two outer bearings located on either side of the main frame support an eccentric shaft, while two inner bearings support a movable jaw. These are commonly known as "pitman" bearings. The reciprocating motion of the shaft moves the pitman against a second, stationary jaw.

As material reaches the bottom of the chamber, it fractures and is discharged at the bottom. The size of the crushed material can be specified by adjusting the gap between the two crushing jaws. Jaw crushers are supplied in sizes up to 1,600 mm (gape)×1,900 mm (width).

For coarse crushing application (closed set~300 mm), capacities range up to 1200 tph. Jaw crushers are mainly used as primary crushers. Their main purpose is to reduce rocks to smaller sizes for the next crushing stages. Jaw crushers are a popular alternative to primary gyratory crushers, since they can process large amounts of hard material efficiently.

Due to their smaller physical size, jaw crushers are also ideal for tight spaces, such as underground mining and mobile crushing applications, where some other primary crushing solutions simply do not fit.

Jaw crushers are relatively uncomplicated machines compared to other crushers. They are robustly designed and manufactured, and they have a long service life. Jaw crushers are simple to maintain and repair, and most importantly, they are easy to operate, which makes them an essential part of the crushing process in various industries.

In conclusion, jaw crushers are widely used in the crushing industry as they provide even and consistent size reduction of various materials. They are commonly used in the mining and construction industry due to their ability to crush tough and abrasive materials. Jaw crushers are the preferred choice for various applications, such as mining, building materials, and aggregate production, to name a few. Their simplistic design and ability to handle hard and abrasive materials make them an ideal choice for primary and secondary crushing.

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