Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr
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P R O C E S S I N G S O LU T I O N S 4.9 m). By using any combination of these two modules, machine sizes of 10 x 24 ft, 10 x 28 ft or 10 x 32 ft (3.05 x 7.3, 3.05 x 8.5 or 3.05 x 9.75 m) can be configured according to the process requirements. The F-Class, in tandem design, can also be operated at variable speeds and with different angles of inclination between the modules, creating a banana screen-type effect. The result, according to the company, is a fully customized screening system adaptable to meet the needs of almost any application. Overall, F-Class screening machines are now available in widths ranging from 3 to 10 ft, all offering standard features that include proven four-bearing technology, minimal structural vibration and consistent stroke. The F-Class, says W.S. Tyler, has an advanced eccentric shaft design, supported by four high-performance, double spherical roller bearings. The double eccentric shaft creates a constant positive stroke that handles material volume spikes without losing momentum. As the eccentric shaft turns, the screen body is forced to follow the shaft movement. While it travels upward, the counterbalance weights move in the opposite direction and create an equal force to that generated by the body. As a result, the forces cancel each other, allowing a dynamically balanced system that transmits minimal vibrations into the structure—allowing multiple screens to be placed side by side while minimizing the installation costs of heavy structures. The design keeps noise emissions low for a quieter system and reduced overall plant noise. The continual circular screening action provided by the eccentric design also produces a constant, optimized G-force. Not only does this further maximize screening efficiency, it allows the F-Class to be an effective solution in both wet and dry applications, according to the company. Designed for high tonnage outputs, the F-Class can process up to 1,200 tons per hour, and screens virtually any material from 6 in. (152 mm) down to 20 mesh. To provide maximum versatility, the F-Class can be run with up to three screen decks. The unit features inclines from 10°–25° and comes with a base frame that allows for simple installation in a customer's existing structure. The F-Class features a Huck-bolted screen body, allowing for extra strength and rigidity. Side plates are constructed with high-strength carbon steel. The area surrounding the shaft www.e-mj.com assembly is strengthened with a reinforcing plate, which ties together the side plate, screen panel and shaft assembly. All 6-ft, 8-ft and 10-ft wide units are built on platforms that combine a machine width and a drive type, consisting of an eccentric shaft assembly. Within the platform, the customer chooses basic parameters, such as screen length and the quantity of decks the application requires. To optimally adapt to each operation, the customer then configures multiple variables such as deck set-up, suspension systems, reinforcing plates, wear lining and stroke and speed combinations. The F-Class's standard 18-month warranty (from date of shipment, 12 months from the installation date, or 6,000 operation hours, whichever comes first) can be extended with optional customer-specific warranty upgrade packages, according to the company. Communication, Diagnostic Features Improve Efficiency Thermo Fisher Scientific recently launched its Ramsey Micro-Tech 9000 Electronics platform, designed to provide enhanced communication and connectivity for process weighing and monitoring applications. According to the vendor, the Ramsey Micro-Tech 9000 Electronics platform improves communication and efficiency via built-in Ethernet and USB and prevents system downtime with independent load cell troubleshooting. The new platform replaces both the Thermo Scientific Ramsey Micro-Tech 2000 and Ramsey Micro-Tech 3000 series of electronic instruments. The Ramsey Micro-Tech 9000 platform features built-in USB for such tasks as uploading set-up information, downloading event logging, setting up multiple systems at once and enhanced system configuration. The built-in Ethernet enables the platform to support a wide range of common protocols and tie equipment into existing systems or establish new process systems. Other features include an improved HMI interface that supports multiple languages (English, Italian, Spanish and German, among others); global approvals; and common technology among components and enhanced hardware design for improved serviceability. The Ramsey Micro-Tech 9000 platform includes 10 models that will be launched over several months. The first three devices to be released include the: • Micro-Tech 9101 scale Integrator used with Thermo Scientific Ramsey Series 10-101R, 10-20 and 10-17 conveyor belt scale systems; • Micro-Tech 9105 weighbelt feeder controller used with Thermo Scientific Ramsey Model 90-100, 90-125 and 90-150 weighbelt feeders; and • Micro-Tech 9100 static weight indicator. Thermo Fisher's Micro-Tech 9105 weighbelt feeder controller. JANUARY 2013 • E&MJ; 91