How does the rotation speed of the Rotary Arch-Breaker Machine affect the arch-breaking efficiency ?
The rotation speed of the Rotary Arch-Breaker Machine is nonlinearly related to the arch-breaking efficiency. There is a critical threshold and an optimal range, which requires precise control based on the material properties.
When the speed is low (usually <15rpm), the shear force and impact force generated by the cutter are insufficient, and the material can only be slightly displaced by surface friction, which makes it difficult to break the cohesion and adhesion of the material. For example, when dealing with cement lumps with a repose angle of 45°, the arch breaking time is as long as 25 minutes at a speed of 10rpm, which can only loosen the surface material, and the deep arch structure remains intact.
When the speed is increased to the critical range ( 15-30rpm ), the shear stress (τ) formed by the linear speed of the cutter exceeds the shear strength (τ ₀ ) of the material, resulting in effective crushing. At this time, the centrifugal force generated by the rotation throws the material to the silo wall, destroying the adhesion arch; the interlaced knives continue to shear and break the agglomerates into flowable particles. Actual measurements show that at a speed of 25rpm , the arch breaking efficiency of flour materials is 4 times higher than that of 15rpm , and the processing time is shortened to 6 minutes.
However, too high a speed (>35rpm) will cause efficiency decline. High-speed rotation generates strong turbulence, which intensifies the friction and heat generation between the material and the air, causing the surface of the sticky material to harden. At the same time, the vibration amplitude of the equipment exceeds the limit, and the centrifugal force of the spindle exceeds the bearing load limit, causing tool deformation and abnormal wear. For example, when processing syrup, although the speed of 40rpm increases the arch breaking speed in the short term, the efficiency drops by 30% after 30 minutes due to adhesion and hardening.
Different material characteristics determine the appropriate speed: high-viscosity materials require lower speed to extend the action time; dust-prone materials require controlled line speed (≤5m/s) to avoid dust diffusion. The speed can be dynamically matched by the variable frequency speed regulation system to increase the arch breaking efficiency by 30%-50%, while reducing energy consumption and equipment loss.
If you want to know how the speed of the Rotary Arch-Breaker Machine affects the arch-breaking efficiency , you can consult our customer service staff. We will serve you wholeheartedly 24 hours a day!