Efficient sand production is at the heart of VSI sand making machines. These machines use high-speed rotors with wear-resistant tooth tips to accelerate material to speeds of 60 - 100 m/s and crush it by "rock-on-rock" or "rock-on-metal" impact. With a crushing ratio of up to 50:1, the output can reach 60 to 650 tons per hour. For example, in a granite sand plant, a VSI sand making machine can produce more than 200 tons of fine sand per hour, which is 30% more than conventional crushers.
Excellent sand quality is another major feature. The impact-based crushing principle results in cubic sand particles with very low flake particles (≤10%), which are ideal for high-strength concrete. The particle size distribution can be precisely controlled by adjusting the rotor speed and feed rate to ensure uniform particle size distribution (0.15 - 5mm) in accordance with ASTM or GB building aggregate standards.
Energy saving and low noise are the remarkable features of VSI machines. Compared with horizontal shaft impactor, its optimized rotor dynamics can reduce energy consumption by 20 - 30%, with power consumption as low as 0.8 - 1.2 kWh/ton. The quick-release maintenance door and modular rotor design allow parts to be replaced within 2 hours, thus reducing downtime. Some models are even equipped with automatic lubrication systems to extend bearing life.
Industrial workshops utilize sand making machines for precise sand production in sectors like casting, foundry, and abrasive material manufacturing. These machines offer tight control over particle size and shape, crucial for producing high-quality molding sands, grinding media, or specialized industrial fillers with consistent specifications.
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