Single-toggle Jaw Crusher
A sectional view of the single-toggle type of jaw crusher is shown in Fig. 6. In one respect, this machine is similar to the Dodge crusher; the movable jaw has its maximum movement at the top of the crushing chamber, and minimum movement at the discharge point. The motion is, however, a more complex one than the Dodge motion, being the resultant of the circular motion of the eccentric-shaft at the top of the swing jaw, combined with the rocking action of the inclined toggle plate at the bottom of this jaw. The motion at the receiving opening is elliptical; at the discharge opening it is a thin crescent, whose chord is inclined upwardly toward the stationary jaw. Thus, at a11 points in the crushing chamber, the motion has both, vertical and horizontal, components.
It will be noted that the motion is a "rocking" one. When the swing jaw is rising, it is opening, at the top, during the first half of the stroke, and closing during the second half, whereas the bottom of the jaw is closing during the entire up-stroke. A reversal of this motion occurs during the down-stroke of the eccentric.
The horizontal component of motion (throw) at the discharge point of the single-toggle crusher is greater than the throw of the Dodge crusher at that point; in fact, it is about three-fourths that of Blake machines of similar short-side receiving-opening dimensions. The combination of favorable crushing angle, and non choking jaw plates, used in this machine, promotes a much freer action through the choke zone than that in the Dodge crusher. Capacities compare very favorably with comparable sizes of the Blake machine with non choking plates, and permissible discharge settings are finer. A table of ratings is given.
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