Rock-on-rock and rock-on-anvil modes are both available: rock-on-rock keeps wear-part consumption low, rock-on-anvil delivers a higher reduction ratio.
Excellent product shape with a high cubic content and little flakiness — usable directly in high-grade concrete.
Fineness modulus and fines content are adjustable through rotor speed, feed rate and cascade ratio.
Deep-chamber rotor with alloy wear tips that can be turned through four positions keeps parts cost predictable.
Oil lubrication station on larger models keeps bearing temperature stable under high-speed, heavy load.
Hydraulic lid opening allows inspection and wear-part changes without dismantling, cutting downtime.

◎Applications

Manufactured sand production (0–5 mm artificial sand)
Aggregate shaping to improve particle shape and gradation
High-grade concrete aggregate for high-speed rail, bridges and hydropower
Fine crushing and liberation in iron, gold and copper operations
Fine crushing in cement, refractory and abrasive industries
Shaping of recycled construction-waste aggregate
Glass and ceramic raw material preparation
Sand production from tailings and waste rock

Working Principle

Feed entering a VSI splits into two streams: one passes through the rotor centre, is spun up by the rotor and accelerated to 60–80 m/s by the wear tips; the other falls through the cascade ports around the rotor. The accelerated material strikes the falling stream violently, and particles also grind against each other and against the wear-resistant lining.

The broken material falls onto a screen plate at the bottom; the finished fraction leaves the machine and oversize returns to the rotor. Adjusting rotor speed changes impact energy and therefore product fineness and output; raising the cascade ratio increases particle-on-particle impact and reduces wear-part consumption.

FAQ

Rock-on-rock or rock-on-anvil — which should I choose?

Rock-on-rock builds a lining from the material itself: low wear-part consumption and low running cost, but a slightly lower reduction ratio — good for abrasive feed and for shaping duty. Rock-on-anvil fits wear-resistant anvils in the chamber: more direct impact, higher reduction ratio and a finer product, but faster anvil wear — good for medium-abrasive feed and sand making. Many plants combine both: a coarse chamber for shaping and a fine chamber for sand.

Can a VSI guarantee 100% below 0.15 mm?

Not with a single machine. A VSI will reduce material below 5 mm, but the fraction below 0.15 mm typically runs 10–25% and cannot reach 100% passing. If the process really needs 100% below 0.15 mm, add a vertical or ball mill with an air classifier after the VSI to do the milling and classification.

What are the wear parts and how often do they need changing?

The main wear parts are the wear tips, distributor plate, top and bottom wear plates and guide plates. In rock-on-rock mode tips typically last 200–400 hours; in rock-on-anvil mode anvils run about 150–300 hours, depending on abrasiveness and speed. Tips can be indexed through four positions, and rotating them on a schedule noticeably lowers cost per tonne.

Need sizing and a quotation for Sand Making Machine?

Send us the material type, feed size, target capacity and product requirement, and we will recommend models, propose a plant configuration and quote factory-direct.

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