Screening in tandem

W.S.Tyler, the premium screening solutions company in the mining, aggregate and industrial mineral industries, offers an alternative to machines larger than 10 ft x 24 ft with its tandem F-Class vibrating screen configuration. Placing two 10 ft x 12 ft F-Class machines in tandem offers many benefits, including cleaner operation, less maintenance and longer life for the structure that houses them when compared to other units on the market.

In a tandem operation, one F-Class unit feeds the other. Whether using a two- or three-deck unit, overall screening is enhanced with a 3 in. drop between screens that promotes additional material tumbling so any fines remaining on top are more likely to fall through. Discharge lips and rubber skirting minimise spillage during the transition.

Large vibrating screens operate horizontally, which requires force and results in more wear. By comparison, W.S.Tyler’s smaller F-Class units run at a 15 – 25° incline. Aside from increasing screening efficiency and reducing blinding and pegging, inclined machines require lower g-force, which is easier on machine components.

In comparison to larger units, running the tandem F-Class configuration is a less expensive option both in terms of initial purchase price and maintenance and repair. First, large units require more robust construction due to the incredible stresses they endure when processing larger loads. Longer side plates are weaker than shorter ones, which leads to more opportunity for damage. Further, the cost of replacing a large machine exceeds the cost of replacing a single module from the tandem set-up. Therefore, operating two smaller units in tandem is a more durable, efficient option.

The F-Class is the ideal vibrating machine to use in a tandem configuration. The machine features proven four-bearing technology and counterbalance weights to cancel the forces generated by the body, so it produces minimal structural vibration. The advanced eccentric shaft, which is supported by four high-performance, double spherical roller bearings, creates a constant positive stroke that handles material volume spikes without losing momentum.

In addition, the continual circular screening action produces a constant, optimised g-force. This minimises blinding and pegging and maximises screening efficiency, which makes the F-Class an effective solution in both wet and dry applications. The unit also is ideal for screening situations that require consistent, load-independent performance at a constant g-force in all operational modes.

The F-Class scalps and classifies ores, minerals, stones, sand and gravel. It processes as much as 1200 short tph, while providing fast, accurate sizing. In addition to traditional screening, the F-Class often is used before primary crushers to screen out fines and eliminate crusher wear. It precisely screens material from 20 mesh – 6 in.

Written by W.S.Tyler. Edited by Jonathan Rowland.

Read the article online at: https://www.worldcoal.com/product-news/03122014/wstyler-screening-in-tandem-coal1633/