Device for adjusting an inertia cone crusher discharge gap

A device for adjusting a discharge gap in an inertia cone crusher comprising a breaking head having a shaft, an out-of-balance weight coupled mechanically with said shaft and rotatable around the vertical axis of said crusher, and a crushing bowl installed above said breaking head and capable of vertical displacement with respect to the latter so as to change the size of said discharge gap, said device including:

• an angle sensor, responsive to a deflection of the axis of said breaking head from the vertical, having an output, said sensor being an induction sensor comprising a plurality of inductance coils interconnected electrically in parallel, said induction coils being mounted fixedly around said shaft of said breaking head and uniformly distributed along a circle having the center thereof on the vertical axis of said crusher, and at least one permanent magnet coupled mechanically with said out-of-balance weight for inducing electrical signals in said inductance coils as said out-of-balance weight rotates;
• a signal preprocessing unit having an input and an output, said input of said signal preprocessing unit being connected with said output of said angle sensor;
• a discharge gap setter having an output, and being adapted for generating a signal determining the maximum permissible size of the discharge gap when said cone crusher is applied to a certain material;
• a comparison unit having first and second inputs and an output, said first input of said comparison unit being connected with said output of said signal preprocessing unit, and said second input of said comparison unit being connected with said output of said discharge gap setter;
• said comparison unit responding to an excess of said maximum permissible size of the discharge gap, determinable by a signal from said discharge gap setter;
• and
• an actuator electrically coupled with said output of said comparison unit and adapted for vertically displacing said crushing bowl with respect to said breaking head when the size of said maximum permissible discharge gap has been exceeded.