Vertical Shaft Impactor

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 (55 M/Sec to 65 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

IT IS THE VELOCITY & VELOCITY ALONE DECIDES THE AMOUNT OF FRAGMENTATION

Therefore VSI is in true sense a Pure Impact Crusher which crushes only by impact Not like other conventional Impact Crushers, where shear compression, arition & impact allocations, play the role in crushing the material.

In VSI there is no gap setting. Crushed material falls through the annular open ring area by gravitational force only.

FUTURE TECH manufactures Stone-on-Stone type of Vertical Shaft Impaction

Rotor is so designed that stone layer gets formed on the vane & creaking surface is also formed by material built up. Thereby reducing the wear on the vanes & breaker walls. But this cushioned surfaces, reduce considerably the amount of crushing. But amount of spare consumption also gets reduced.