The working principle of jaw crusher is very simple. The whole crushing process rely on the relative motion of the two jaw plates. 
One of the jaw plates stay still while the other move against it. And with the movement, the materials between the two plates
 would be crushed into small elements. While the plates move against each other, the materials would be crushed 
and while plates move away from each other, the broken materials which are smaller enough would drop through 
the discharging opening. And due to the simple structure, jaw crusher is easy to maintain and repair. 
These features promote its popularity to a great extant.

Usage and Application Fields:
1. Jaw crusher is mainly used for the medium and fine crushing of hard ores and rocks in metallurgy industry, mine industry, chemical industry, cement industry, construction industry, refractory materials industry and ceramic industry and other sectors.
2. It is suitable for crushing all kinds of hard and soft ores with less than 300MPa compressive strength, such as pebble, calcite, granite, quartz, concrete, dolomite, bluestone, iron ore, limestone, iron ore, coal gangue, construction waste, ferrosilicon, basalt, sandstone, ore, glass, cement clinker, etc.