What is a Vertical Shaft Crusher?

A Vertical Shaft Impactor (VSI) is a special type of impact crusher designed for the high-speed, controlled crushing of hard and abrasive materials. These machines operate on the principle of a rotor spinning around a vertical axis. The rotor hurls the material that falls into it at a high velocity toward the outer perimeter of the machine. This impact causes the material to break against itself or against the outer wall. This autogenous crushing principle is an ideal solution for processing abrasive materials, such as high-silica stones, as it leads to less wear on the crusher.

Vertical shaft crushers are widely used in concrete plants for producing high-quality sand and aggregates, as well as in road construction and various mining applications. When compared to horizontal shaft crushers, they generally have lower operating and maintenance costs. They also offer advantages in energy efficiency because the material's self-crushing principle consumes less energy. The rotors of these types of crushers operate at high speeds, making their dynamic balancing critically important. At MBS Balance, by correctly balancing the rotors of these crushers, we both extend the machine's lifespan and ensure more efficient and safer operation.

Because the rotor of a vertical shaft impact crusher throws abrasive material at high peripheral speed, it must both be precisely balanced at the outset and monitored periodically for progressive unbalance due to wear. Irregular wear on the buckets, tip plates, and wear parts continuously changes the rotor's mass distribution; this means vibration that grows with centrifugal force as the speed increases. These heavy rotors with high moments of inertia generally require two-plane dynamic balancing.

When the unbalance is not eliminated, the main shaft bearings, belt, and chassis wear out quickly; the life of the wear parts shortens and energy consumption increases. Wear parts should be replaced in sets and with balanced masses, and the balance should be verified after assembly. MBS Balance offers high-capacity workshop balancing machines and on-site rotor balancing solutions for vertical shaft impact crusher rotors, extending machine life and providing stable, safe crushing performance.