The ES Series Horizontal Screens from Metso are tough enough, and flexible enough, to handle what quarries can throw at them.
When Metso designed its ES Series Horizontal Screen range, it wanted to create something that had a wide range of applications, without sacrificing durability.
The ES Series horizontal screens can incorporate any type of screening media, making them applicable for quarries, gravel pits, mines, and mobile screening applications.
Their wide applicability is due to the design, which includes two unbalanced shaft lines that rotate in opposite directions. This rotation generates an elliptical motion and delivers a high level of accuracy when screening.
“ES Series horizontal screens are commonly utilised to produce end-product fractions. They separate materials with consistency and accuracy, even in damp and sticky conditions,” Metso business development manager John O’Reilly said.
“They provide highly efficient, reliable, accurate and consistent screening for different kinds of conditions and materials.
“This gearless solution is more efficient than conventional horizontal screens with linear motion, and more reliable than other elliptical motion screens.”
Versatile and durable
Screening accuracy can be reliant on several factors, ranging from the type of material to the conditions. In some instances, screening sticky and wet materials can be harder than in drier conditions with dry materials.
But many quarries or crushing and screening contractors need equipment which delivers in all conditions to ensure their productivity and output remains consistent.
The ES Series from Metso has been shown to work in many different conditions and applications including end screening, dry screening of sticky material, waste screening, wet screening, stationary applications, abrasive rock, soft gravel, recycled materials and more.
According to Metso’s internal data, the elliptical motion provides up to 25 per cent greater screening capacity than comparable models. During the research and design process, Metso conducted extensive kinematic studies, which included cross calculations and comparisons between CAD tools, theoretical calculations, bench testing, and on-site tests.
O’Reilly said has led to several innovations in the design which make the screens more reliable and durable.
“The result is a simpler, but more effective design. Specifically, the welding on the cross members is reduced to a minimum to prevent the formation of cracks along the beams,” he said.
“This reduces the risk of fatigue stress and optimises the screen lifetime. In addition, ES Series screens have weld-free side plates to increase the durability and stress tolerance of the screens.
“This, along with just two counter-weighted shaft lines and a highly reliable grease lubrication system, keeps downtime and maintenance to a minimum. With no timing device, gears, belt or oil leakage – very little can go wrong.”
Part of the reason the ES Series screens remain durable during these applications is due to its design . The ES Series horizontal screens’ shaft lines are made of Metso’s Modular Vibrators (Metso MV), flange mounted to the side walls and synchronised by a cardan shaft. Each Metso MV includes two bearings, which provide a long bearing life, while the side walls and cross members are weld-free to reduce potential weak points.
“In difficult screening conditions, such as wet screening or screening of sticky and dirty materials, the ES Series horizontal screens provide exactly the kind of aggressive screening action you need,” O’Reilly said.
“ES Series horizontal screens can be fitted with either tensioned screening panels or modular snap-on panels. The screen angle is adjustable from 0 degrees to 10 degrees to increase the capacity when needed. Stroke and revolutions per minute (RPM) parameters can be set up within a wide range to meet optimal performance.
“The integrated feedbox is very deep and long to allow easy interface with the feed conveyor. Furthermore, the design provides immediate particle distribution over the first panel row of the top deck enabling higher efficiency.”
Metso designs all of its stationary screens with safety in mind. The focused design ensures all maintenance meets the standards of the European Union, including EU standard (EN 1009-1:2020) which covers safety requirements and their verification for designing and constructing screening machinery.
The EU standard sets among all minimum distance requirements for the intermediate space of screens, which are already met by the majority of Metso’s stationary screening range.
Metso vice president for the central region screening business line Adrian Wood said the manufacturer needed to supply information on safe working practices, including residual risks to meet this standard.
“Good equipment design should create safe working and operating conditions. Our stationary screens not only meet but exceed current safety requirements set by the European Union,” he said.
“This easy access is critical as screen maintenance and inspection interventions are frequent, with not only regular weekly and monthly routine-based condition checks, but potentially regular replacement of screen panels which must be carried out safely whilst still aiming for the shortest possible maintenance downtime.”
One example of Metso’s safety focus is how the ES Series screens have only one shaft line between the decks compared to the usual three. The reduction in shaft lines mean it is easier for workers to access the inside of the screen and perform maintenance safely.
“ES Series horizontal screens meet the high health and safety standards. The comfortable room between the decks is a strong health and safety feature resulting in safer and faster panel replacement,” O’Reilly said.
“ES Series horizontal screens are designed to keep downtime and maintenance to a minimum, as there is no mechanical timing device, no gears, no belt and no oil leakage.” •
For more information, visit metso.com
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