Jaw crushers used as Primary crushers
Various types of crushers are used in the stone crushing industry such as Jaw
Crushers, Roller Crushers, Cone Crushers, Impactor, Rotopoctor etc. Generally,
only Jaw crushers are used as Primary crushers.
These are the oldest type of and most commonly used crushers in use and
have changed little from the original design. In Jaw Crusher the feed is
compressed between a stationary and a movable surface. A few of common
types of Jaw crushers, in use, are described below.
• Double Toggle Crusher: The Blake jaw crusher has a fixed jaw and a
moving jaw pivoted at the top. The crushing faces themselves are formed
either of manganese steel or of chilled cast iron. The maximum pressure is
exerted on the large material, which is introduced at the top. These crushers
are made with jaw widths varying from about 2” to 48” and the running
speed varies from about 100 to 400 RPM.
• Single toggle Jaw crusher: The single-toggle crusher is the simplest and
the lightest of the jaw crushers but is suitable only for producing low crushing
forces and therefore used for soft rocks.
• Impact Jaw Crushers: In this type of crusher the crusher cavity is inclined.
As there is larger stroke and higher rotation speed (about 400 rpm) a
stronger impact is achieved. As a result, hard, tough materials can be
processed.