Engineering & Mining Journal

AUG 2018

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SCREENINIG MACHINES 40 E&MJ • AUGUST 2018 www.e-mj.com you can screw it out with a normal impact torque wrench with a specially developed socket that we have," he said. "You can also screw it in and screw it out." The benefits include "ease of instal- lation, less downtime, and better ability to adapt to the changing mineral or rock output," Dougherty said. One of the main selling points, howev- er, is safety, and the design was prompt- ed in part by customer demand, Larsson said. "Many of the bigger mining groups want to limit the use of sledge hammers and tools used in knocking wedges to do service and maintenance because that is a health and safety hazard," he said. "Removing pins and things like that from a deck, you often use crowbars or screw- drivers and so there are possibilities of injuring yourself." With the 305PS "you don't really need any sledgehammer at all and you can work in quite confined spaces," Larsson said. And "there is no added labor that increases risk when you take it out." Metso offers a monitoring service "where Metso will monitor the wear and give recommendations," Dougherty said. "That entails going out to the site and taking readings on panel thickness, from the feeding end of the screening unit down to the discharge end of the unit, laying it out on a graph, adding time and or tons, whatever the customer wants, and giving it to them back in the form of a wear monitor — how long did it last over what time at what throughput." All this combines to make the 305PS an "easy proposal" for a customer to ac- cept, Larsson said. "It is a low-threshold entry product in that sense," he said. "It is easy to replace, easy to put on trial, and you don't have to discuss making modifi- cations to support frames or rails." A Departure From Old Concepts McLanahan Corp. reported that with positive field results received on a MAX Vibrating Screen prototype from an open- pit nickel miner in Sudbury, the compa- ny could expand the line by offering the design in more sizes. "Our MAX Inclined Screen has been (there) for an entire season and it continues to meet every expectation," Gerry Mangrich, global pro- duction manager, crushing and screen- ing, McLanahan, said. "With sufficient field-proven experience, we are confident in the design and our ability to broaden the scope over numerous model sizes." The line was announced in late 2016 and was pitched as capable of separating coarse feed materials from finer material. Market research and the deep experi- ence of company engineers provided the original seed idea for the solution, Mangrich said. "As a major manufacturer of process- ing equipment over a broad spectrum of industries, we find a common need, a com- mon link, critical to each industrial market," he said. "That common link is an expanding line of inclined and horizontal screens." The goal was to "introduce a new family of both inclined and horizontal screens," Mangrich said. "The MAX screens repre- sent a departure from old concepts, and introduce new features and designs based on the latest technologies." While the screens are now offered in siz- es and configurations ranging from 5-by-16 ft to 8-by-24 ft in triple, double- and sin- gle-deck models, the prototype was an 8-by- 20-ft triple deck with a dual mechanism, Mangrich said. It is field proven, opening the door to further development of the solution. "The MAX line of screens has proven to meet expectations, but is still in its early stages," he said. "The encouraging feedback is what drives us to achieve new goals." MAX Vibrating Screens are designed for maximum durability and optimal effi- ciency, McLanahan reported. For maximum durability, the screens are fabricated with A572 grade-50 steel plate, which offers a 45% higher yield strength than A36 plating, the company reported. "Side plates are a fully bolted construction, which reduces and eliminates cracking due to stress caused by welding," McLanahan reported. "The bolted construction also makes it easier to change out worn compo- nents without cutting." Screen design is intended to improve user safety and facilitate maintenance, the company reported. The line provides maximum headroom between decks to speed and simplify me- dia changeouts, McLanahan reported. The shaft integrates bronze sleeves at both ends for protection when the outer race of the bearing could potentially turn on the shaft, the company reported. "This Above, orange pins secure the screens and are screwed in with an impact driver. (Photo: Metso) MAX Series Vibrating Screens are promoted as a solution that can be adopted with no modification of existing structures. (Photo: McLanahan)]

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