Vertical Shaft Impactors

Vertical Shaft Impactors

Shree Conmix Engineers Private Limited

Shree Conmix Engineers Pvt Ltd offers Vertical Shaft Impactors. VSI crushers use a different approach involving a high speed rotor with wear resistant tips and a crushing chamber designed to 'throw' the rock against. VSI crushers utilise velocity rather than surface force as the predominant force to break rock. In its natural state, rock has a jagged and uneven surface. Applying surface force (pressure) results in unpredictable and typically non-cubical resulting particles. Utilising velocity rather than surface force allows the breaking force to be applied evenly both across the surface of the rock as well as through the mass of the rock. Rock, regardless of size, has natural fissures (faults) throughout its structure. As rock is 'thrown' by a VSI rotor against a solid anvil, it fractures and breaks along these fissures.

Final particle size can be controlled by:

  • The velocity at which the rock is thrown against the anvil
  • The distance between the end of the rotor and the impact point on the anvil.
The product resulting from VSI crushing is generally of a consistent cubical shape such as that required by modern Superpave highway asphalt applications. Using this method also allows materials with much higher abrasiveness to be crushed than is capable with VSI crushers generally utilise a high speed spinning rotor at the centre of the crushing chamber and an outer impact surface of either abrasive resistant metal anvils or crushed rock. Utilising cast metal surfaces 'anvils' is traditionally referred to as a "shoe and anvil VSI". Utilising crushed rock on the outer walls of the crusher for new rock to be crushed against is traditionally referred to as "rock on rock VSI". VSI crushers can be used in static plant set-up or in mobile tracked equipment.

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