Vertical Shaft Impact Crusher

HOW VSI WORKS ?

VSI is nothing but a Centrifugal "STONE-PUMP". Stones are fed into centre of the rotor (like water in the centrifugal pump) & stones are thrown outwards towards the periphery by centrifugal force.

Feed material is fed through a vertical tube in the centre of the horizontal rotor rotating at high speed (60 M/Sec to 70 M/Sec) around a vertical axis. Feed material due to centrifugal force starts picking up speed and it starts getting distributed over the distribution cone & as the material travels over the rotor-vanes, towards the periphery attains the same speed as speed of rotor's periphery. At the instant of alighting from the rotor, material attains a velocity which is the resultant of peripheral velocity and radial velocity (due to centrifugal force) and direction of the resultant velocity is almost 45 degrees to radial direction.

Kinetic energy of these feed particles, is so high that after impact, against the breaking surfaces stresses developed within the particles overshoot their ultimate strengths and thereby particles disintegrate into number of pieces giving rise to new surfaces.