vertical shaft impact (VSI) crushers were the first vertical shaft impactors in the world. VSI crusher was developed in New Zealand ove 10 years ago after which the VSI crushers have spread to thousands of crushing sites around the globe.
VSI crushers have evolved immensely over the years, but their trademark is still the same: accurately shaped end products.
High-quality end products
The secret behind VSI crushers’ efficiency is the unique crushing process. While most other crushers reduce rocks by pushing them by force against metal, VSI crushers also use the rock fed into the machine to crush itself.
This autogenous crushing action results in lower cost per ton than any other impact crushing method. Furthermore, rock-on-rock crushing has proven to produce end products that have precise and homogenous shape.
In addition to traditional rock-on-rock crushing, VSI crushers can nowadays also be equipped with metallic anvils on request. In this case the rock-on-rock cavity ring is replaced with an anvil ring, and the rocks are slung against metal anvils instead of a rock bed. The anvil solution improves reduction ratio and enables finer end products, but the downside is slightly higher wear costs because the anvils must be replaced from time to time.
VSI crushers accept fines in the feed and allow user to finetune crusher’s performance by changing the rotor speed or cascade ratio. Due to these features and precise reduction, VSI crushers are especially useful for producers who are after cubical end products used for example in concrete, asphalt and in groundwork materials. Moreover, the accurate shaping capabilities have proven worthy in manufactured sand, heap leaching, pre-grinding, industrial minerals, and recycling applications.
- End products with superior cubical shape
- Accepts fine feed material
VSI crushers the primary path for feed material is through the rotor where it can be accelerated up to 80 m/s (262 ft/s) before being discharged into the crushing chamber. Additionally, material may be cascaded into the crushing chamber, bypassing the rotor.
The cascade feature enables the operator to optimize the capacity and power consumption and to manipulate the product grading and shape to meet the specification requirements.
- Ability to control product grading
- Fine-tune product with cascading
Easy to install and maintain
VSI crushers are designed to prolong the lifetime of wear parts and increase the operational availability by reducing the time needed for parts changes.
Service time is drastically reduced with quick access to the rotor parts via an inspection door. The roof lifter and rotor service arm eliminate the need for an external crane in regular maintenance which simplify servicing the internal workings and speed up rotor changes.
- Low wear costs due to rock-on-rock crushing
- Metso parts for trouble-free operation
Simple and reliable automatic lubrication handles the daily greasing of the main shaft, crusher automation ensures safe operation and condition monitoring from distance.
- Multiple features for safer operations and maintenance