Towards greater screening productivity
Duncan High, Processing Equipment Technology Manager for Haver & Boecker Niagara, highlights the advantages of adopting advanced vibrating screening technologies, including double eccentric screening with shear rubber mounts to improve screening performance and productivity.
eccentric shaft assembly deliver a constant stroke to maintain g-force during material surging. The double eccentric shaft design forces the screen body to follow the shaft's motion. As the shaft rises, the counterbal- ance weights move in the opposite direction, creating a force equal to that generated by the body. As a result, the forces cancel each other out, maintaining a consistent positive stroke that handles material volume spikes without losing momentum. One producer in Western Canada quickly saw the benefits of switching to double ec - centric screening technology after replac- ing two horizontal vibrating screens with one double eccentric, four-bearing inclined vibrating screen. Changing their equipment helped eliminate surging, blinding, pegging, and material contamination while increasing production by 25%. Reduce damaging vibrations A vibrating screen’s operation can significant - ly affect its surroundings. The metal springs on a traditional concentric vibrating screen, for example, can be noisy to operate. This metal- to-metal, up-and-down or side-to-side move- ment can cause excessive noise and vibration. To resolve this problem, double eccentric
technology uses shear rubber mounts stra- tegically designed to minimise lateral move- ment. The rubber mounts reduce noise while maintaining smoother operation, even under extreme conditions such as overloading, surg- ing and starting or stopping under load. The use of eccentric technology virtually eliminates vibration in fixed structures or chassis when used with portable equip- ment, protecting the integrity of the ma- chine. This also enables producers to use multiple eccentric vibrating screens within a single structure, boosting productivity. Operating multiple concentric machines within a structure can generate vibrations that negatively affect quality and increase safety and downtime risks. A leading phosphate producer in North America, producing nearly 8 million tons per year, increased screening area by 60% percent by transitioning to double eccen- tric equipment. The mine features a six- story screening plant with multiple vibrating screens operating 24/7. Multi-story screen houses are common in the industry but can pose structural concerns due to the vibrat- ing screens’ size, capacity and force. Opting for double eccentric technology eliminated those concerns.
G lobal demand for aggregates and mining materials is on the rise, with the industry expected to grow by nearly 4.2-billion tons over the next 15 years. That’s a lot of material, which means producers need efficient equipment to meet specifications and turn a meaningful profit. Every ton of material must pass through at least one vibrating screen, so ensuring the equipment’s efficiency is critical to the operation’s success. The good news is that technologies are available today to improve screening productivity. Integrating cutting- edge systems such as eccentric screening technology, state-of-the-art screen media, and diagnostic tools can prevent blinding, pegging, carryover and contamination, im- proving screening performance, productivity and profits. With more than 30 years of industry experience, Duncan High is the Processing Equipment Technology Manager at Haver & Boecker Niagara.
Double eccentric screening action Vibrating screens engineered with a double
Integrating eccentric screening technology, state-of-the-art screen media, and diagnostic tools can prevent blinding, pegging, carryover, and contamination, thereby improving screening performance, productivity, and profitability.
38 ¦ MechChem Africa • January-February 2025
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