GNR Series Vertical Shaft Impactor (VSI)

The GNR series vertical shaft impactor (VSI) accelerates material with a vertical rotor and breaks it against an anvil or its own rock bed. Capacity 45–210 tph, rotor 700–900 mm, feed ≤55 mm, 90–400 kW. Its purpose is exceptional cubicity and manufactured sand rather than reduction. The GNR series vertical shaft impactor (VSI) accelerates material with a vertical rotor and breaks it against an anvil or its own rock bed (rock-on-rock). Its purpose is exceptional cubicity and manufactured sand rather than reduction; it gives the most cubical product to meet the Flakiness Index requirements of concrete and asphalt. Technical data Working principle The vertical rotor accelerates material to about 80 m/s; breaking and shaping occur in rock-on-rock (autogenous) or anvil mode. With small feed (≤55 mm) it is the final-stage machine after a cone/tertiary in the plant. Stage: tertiary/quaternary + shaping. Material and application Best for: manufactured sand and cubical fine aggregate from high-silica, abrasive material (granite, basalt, river gravel, slag) — rock-on-rock minimises metal wear, so it beats a tertiary impactor on abrasive material. It also improves cubicity on limestone. Reduction and wear (TCO) A VSI is a shaping device, not a reduction one; the net ratio is project-specific. Wear parts are rotor tips, wear plates and anvil/bed; in rock-on-rock a "rock bed" replaces parts to extend life on abrasive material. High silica uses ceramic/tungsten-carbide reinforced tips; the cost-per-tonne advantage is clear in autogenous mode. The VSI is the final link in the manufactured-sand → washing → dewatering chain; we supply the line with washers and fine-material screens from a single source. S: What does a VSI do? C: It produces the most cubical fine aggregate and manufactured sand (shaping). S: VSI or tertiary impactor? C: VSI for abrasive/high-silica (rock-on-rock wears little); tertiary impactor for low-abrasive. S: What is rock-on-rock? C: Throwing material against its own rock instead of a metal anvil; it extends part life. S: Does it give concrete-grade sand? C: Yes; it meets Flakiness/gradation requirements, and washing removes fines/clay. S: How can I get a quote? C: Send us your capacity and material; we provide a project-specific quote and full-plant solution.