In stone crushing production, a VSI (Vertical Shaft Impactor) sand-making machine serves as a tertiary or quaternary stage. It is typically installed downstream from an impact crusher or a cone crusher. The feed material size is relatively small. Through two primary crushing mechanisms—”rock-on-rock” and “rock-on-metal”—the machine further processes previously crushed and screened material to produce high-quality, cubical-shaped aggregates that meet specific requirements.

The VSI sand crusher is particularly well-suited for the secondary and fine crushing of various hard and brittle materials—such as abrasives, quartz sand, limestone, river pebbles, granite, concrete aggregates, refractory materials, bauxite clinker, metallurgical slag, and carborundum—provided the moisture content of the material does not exceed 20%. It is currently an ideal, highly efficient, and energy-saving solution for sand production.

VSI Sand Making Machine Working Principle

The VSI sand-making machine uses two crushing modes, “rock-on-rock” and “rock-on-metal,” which you can switch between based on material characteristics and product requirements. The equipment supports two feeding methods: full center feeding and center feeding combined with a peripheral “waterfall” (cascading) feed.

Material enters through the feed hopper, passes into a high-speed rotating rotor, is accelerated and then ejected. It first collides with material that rebounds and falls freely. Subsequently, the material impacts either the layer of accumulated rock lining the vortex chamber (“rock-on-rock”) or the metal impact blocks (“rock-on-metal”). These rebounds cause continuous collisions with incoming material, creating a sustained “curtain” of rock before the final product is discharged through the bottom outlet.

The maximum feed size must strictly adhere to the specifications provided in the machine’s technical performance parameter table; material exceeding these dimensions is strictly prohibited from entering the crusher. The feed material’s maximum moisture content must be below 20%. Typically, ore processed through a sand-washing machine can be fed directly into this unit for crushing.

Features of VSI Sand Crusher

1) Flexible Feeding Methods

Supports switching between “cascade feeding + center feeding” and “all-center feeding” modes.

2) Excellent Finished Product Shape

During operation, the material undergoes multiple rounds of impact, friction, and attrition, producing a high-quality finished product. The output particle size is fully adjustable. The final product is cubic in shape and free of impurities, enhancing its utility.

3) Four-Port Impeller Design

VSI sand crusher increases crushing efficiency, allowing higher material throughput and boosting finished-product yield.

4) Large Discharge Opening

Effectively prevents material clogging and improves overall crushing efficiency.

5) Easy Maintenance

Equipped with a hydraulic lid-opening system and a lifting device, making maintenance quick and convenient.

VSI Sand Making Machine Applications

1. Production of manufactured sand from river pebbles, quarried stone (such as limestone, granite, basalt, diabase, and andesite), mine tailings, and stone chips.
2. Production of construction aggregates, road surfacing materials, base/sub-base materials, and aggregates for asphalt and cement concrete.
3. Production of manufactured sand and shaping of stone materials for engineering projects, including water conservancy and hydropower facilities, high-grade highways, expressways, high-speed railways, passenger-dedicated railway lines, bridges, airport runways, municipal infrastructure, and high-rise buildings.
4. Fine crushing processes in the mining industry (prior to the grinding stage); crushing of materials for sectors such as construction materials, metallurgy, chemicals, mining, refractories, cement, and abrasives.
5. Crushing of highly abrasive materials and secondary disintegration/crushing; environmental protection projects such as desulfurization in thermal power and metallurgical industries, as well as the crushing of steel slag and construction waste.
6. Production of glass, quartz sand, and other high-purity materials.

Technical Parameters of VSI Sand Crusher