What's Vertical Shaft Impact Crusher (VSI)?

A Vertical Shaft Impact Crusher (VSI) is a type of impact crusher that operates on the principle of centrifugal force and rapid rotation. It is also known as a sandmaking machine and is commonly used in the production of high-quality artificial sand and crushed aggregates. The primary function of a VSI crusher is to shape and crush rocks into sand-sized particles.

Key features of a Vertical Shaft Impact Crusher (VSI) include:

1. Vertical Shaft Configuration:

The crusher has a vertical shaft that is usually arranged vertically or nearly vertically. This shaft is equipped with a rotor that rotates at high speeds.

2. Rotor Design:

The rotor is a key component of the VSI crusher. It is typically equipped with wear-resistant carbide tips or inserts, known as sandmaking strips or shoes. These carbide inserts provide the necessary hardness and wear resistance to crush and shape the feed material.

3. Centrifugal Force:

The rotor in a VSI crusher spins rapidly, creating a high-speed rotational motion. This centrifugal force propels the feed material outward from the center of the rotor to the periphery.

4. Crushing Chamber:

The feed material is introduced into a crushing chamber where it encounters the rapidly spinning rotor. The high-speed impact between the material and the carbide-tipped rotor leads to the crushing and shaping of the particles.

5. Rock-on-Rock Crushing:

In many VSI crushers, the crushing process occurs as the material impacts other rock particles within the crushing chamber. This is known as rock-on-rock crushing, and it contributes to the production of well-shaped and fine aggregates.

6. Adjustable Feed Control:

VSI crushers often have adjustable feed control mechanisms to regulate the amount of material entering the crushing chamber. This allows operators to optimize the crushing process for different types of feed material.

7. Product Grading:

VSI crushers are capable of producing a well-graded end product with a consistent particle size distribution. This is important for applications where precise control over the size and shape of the aggregates is required.

8. Multiple Configurations:

VSI crushers are available in various configurations, including open or closed rotor designs. The choice of configuration can impact factors such as the type of end product and overall efficiency.

Application in Sandmaking:

One of the primary applications of VSI crushers is in the production of manufactured sand. The high-speed impact and shaping capabilities make them well-suited for creating sand with desired specifications.

VSI crushers are commonly used in the mining, construction, and aggregate industries for producing sand, gravel, and crushed stone. They are known for their ability to produce well-shaped and fine aggregates with high efficiency.

Various manufacturers produce VSI crushers with different designs and features. When selecting a VSI crusher, factors such as feed material characteristics, required end-product specifications, and overall production goals should be considered.