• Jaw crushers compress the feed between a stationary jaw and a movable jaw.
Types of jaw crushers :
1. Blake jaw crusher.
2. Dodge jaw crusher.
• In the Blake jaw crusher, the movable jaw is pivoted at the top, thus giving greatest movement at the bottom.
• In the Dodge jaw crusher, the movable jaw is pivoted at the bottom, thus giving greatest/maximum movement at the top.
• The Dodge crusher is less widely used because of its tendency to choke due to the minimum movement of the jaw at the bottom.
Difference between Blake Jaw Crusher and Dodge Jaw Crusher :
(i) Blake Jaw Crusher : (i) movable jaw is pivoted at the top, (ii) maximum movement is at the bottom, (iii) no tendency to choke/clog (freedom from choking),
(iv) suitable for high production rates, (v) large reduction ratio is not possible, (vi) low maintenance, (vii) comparatively made in large sizes, (viii) does not give uniform product, (ix) commonly/widely used.
(ii) Dodge Jaw Crusher : (i) movable jaw is pivoted at the bottom, (ii) maximum movement is at the top, (iii) tendency to choke (no freedom from choking), (iv) suitable for low production rates, (v) large reduction ratio is possible, (vi) high maintenance, (vii) comparatively made in smaller sizes, (viii) gives uniform product, (ix) seldom/less widely used.