Supercharge your crushing process

For many years the Barmac VSI, with its cascade system, has provided progressive processing operations with the ability to maximise production of the products they require while at the same time minimising total operating cost.

Barmac operation
The autogenous Barmac VSI features a rock-lined rotor at the heart of its operation. The rotor launches a non-stop rock stream into the Barmac VSI's rock-lined crushing chamber. Material fed into the top of the machine is accelerated in the rotor and is continuously discharged into the crushing chamber at velocities of up to 85 metres (275 feet) per second.

This process replenishes the rock lining while at the same time maintaining a rock-on-rock chain reaction of crushing and grinding. A second stream of material can be cascaded in a controlled quantity into the crushing chamber, causing an increase in the particle population within the chamber, thus improving energy transfer.

Cascade
Material is fed straight into the Barmac VSI rotor or can be set to bypass the rotor and directly enter the crushing chamber by way of the cascade feed system. In combination with other variables such as rotor diameter, speed and crushing chamber profile, this can enhance power efficiency, reduce wear, and provide an efficient means of controlling the grinding and crushing action to either maximise or minimise fines.

Using the cascade feed system is like supercharging the Barmac VSI. Crushing efficiency is improved by increasing the particle cloud density in the crushing chamber, thereby increasing the frequency and probability of collisions. This gives the operator more value for money by providing more inter-particle action where it is needed most - in the crushing chamber.