Both Dodge and Blake crushers look similar to each other. In Dodge crusher the moving jaw is pivoted at the bottom in place of of the top as in case of Blake crusher. Hence the maximum swing of the moving jaw is obtained at the top.
The gape is a variable while width of discharge opening (set) is fixed. Due to the fixed set, the product is more uniformly sized as compared to the product from the Blake. The crusher has got fewer mechanical parts as compared to Blake crusher.
The moving jaw is activated by a lever It is activated by a lever-eccentric arrangement mounted onto the main shaft as compared to the toggle-pitman combination in case of Blake crusher.
The inherent problem with this crusher is its tendency to choke frequently and that is why it is used less widely. This crusher is usually made in smaller size than the Blake crusher because of high fluctuating stresses working on the machine members.
The major advantage of this machine is its power to effect larger size reduction because of larger-opening at the top with a fixed set. The advantage of uniform product size is the most significant where a single crusher is used as the only comminution machine.
In industries where elaborate screening is available Blake crusher is preferred because of its higher capacity and more balanced mechanical design. The Dodge crushers are usually used in college and research laboratories.
