YOUR NEXT JAW CRUSHER; WILL IT HAVE THESE FEATURES?
- Crushing Without Abrasion
- Perfect Balance
- Large Reduction Ratio
- Large Capacity Per Horsepower
- Sealed
- Dirt free Lubrication
- Simple
- Positive Safety Device
LET’S see why it is impossible to balance ordinary crushers.
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| BLAKE TYPE |
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| OVERHEAD ECCENTRIC TYPE |
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| KEU-KEN CRUSHER |
In the overhead eccentric type shown at the right again we have two motions-Circular and Reciprocating. In this machine we have a single jaw which moves downward and at the same time toward the stationary jaw. The toggle is also unbalanced. Here again there is no opposing reciprocating motion for counter-balancing. Counterweights on the flywheel can never balance this mechanism, so speed and output must be low. As crushing is only done during crushing strokes fewer crushing strokes mean less crushed rock.
Now see how every moving part on a KUE-KEN is counterbalanced by another part of equal weight moving in the opposite direction. First consider the eccentric shaft with its circular motion. There are two counter eccentric, each half the weight of the simple center eccentric . The throws on these two outer eccentrics are equal to and opposite to the center eccentric. Therefore the shaft itself is in perfect balance. Note that this is circular motion counterbalanced by circular motion. On the center eccentric there is one pitman while both outer eccentrics have pitman with a total weight equal to the center pitman. As the center pitman moves up the outer pitmans move down. Again we have perfect balance with reciprocating motion counterbalanced by reciprocating balance. Now consider the long pendulum type jaws with the upper hinge pin over the center of the crushing zone. As shown at the right, see how the jaws travel to and from each other in unison with practically no lifting. Again we have perfect balance, possible only in a KUE-KEN, reduces power and weight. It eliminates heavy flywheels and massive foundations and permits high speed efficient crushing.
KEU-KEN CRUSHER: It is an established fact that it is mechanically impossible to counter balance reciprocating motion by circular motion. The blake type crusher, shown at the right has a single heavy swing jaw operated by a single pitman and toggles. Now let’s analyze the motion in this machine. We will start with eccentric and the pitman at the bottom of their stroke, the toggles pointing down and the jaw open. As the eccentric revolves it lifts the pitman and the ends of the toggles. As the toggles lift and straighten out, they move the swing jaw toward the stationary jaw, at the same time swinging in upward. Note how all these heavy masses move upward together until the eccentric reaches the top and then they all come down together. As there is no opposing reciprocating motion to counterbalance this heavy mass, this machine can never be balanced and must be run slowly. Counterweights on the flywheel can only be used to balance the eccentric.