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Why the Jaw Crusher Can not Be Used As a Fine Crusher?

Aug 07 2014

Now the jaw crusher is used for coarse crushing materials in the first process of the production line. Why the jaw crusher can not be used as a fine crusher? I will give you a specific explanation in the following parts.

From the mechanical point of view, jaw crusher is a typical single-rocker mechanism. That is to say that its eccentric shaft is a crank, its movable jaw is a connecting rod, and its toggle plate is a rocker. When the jaw crusher operates, the rotary motion of the crank turns to a swing motion through the connecting rod and rocker. One side of the movable jaw and the frame make up a U-shaped crushing chamber. The upper of the movable jaw gets rushing force directly from the eccentric shaft, and the lower part of the movable jaw gets crushing force and discharging stock through the swing motion of the toggle plate drove by the movable jaw. Such structure is simple, cheap, and easy to be made.

However, jaw crusher has a congenital drawback. When it works, the lower jaw is in the “force reduction” state instead of the material crushing stroke. Although the jaw crusher has a little function of crushing in this stroke, the crushing stroke produced by the movable jaw in horizontal direction contradict the discharging stroke due to the existence of "force reduction" effect. That is to say, when the jaw crusher needs much crushing force, the discharging capacity is almost zero, and when the discharging capacity is enough, its crushing force sharp declines.

In the production line, to get high yield, we usually adjust the discharging port to the maximum. This may help to increase its production, but the crushing force now is in the state of force reduction" which can not meet the requirement of ultra-fine crushing. Besides, the structure of the jaw crusher’s crushing chamber can not change as the change of the materials’ fineness. The crushing mechanism of single particle crushing is the main factor that restrict the uniform fine crushing of the jaw crusher.

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