Two-Stage 'RC' Circular Vibratory Screener

The two-stage design features an upper screen deck having a 360¡ annular gap at the screen's periphery. This deck is fed with more material than it can efficiently screen, with two results: 1) On-size material falling through the upper screen is funneled through a hole in the center of the lower screen to the machine's discharge outlet and 2) The overflow of on-size material plus all oversize material cascade over the screen's periphery, onto a second screen of equal mesh that scalps the balance of material in normal fashion.

The two-stage machine boosts capacity without increasing floor space, and costs 20 to 30 percent less than conventional screeners having larger diameters and equivalent capacities.

The two-stage screening hardware can be installed in new circular vibratory separators or retrofitted on site in existing circular screeners. Two-stage machines are offered in diameters from 40 to 100 inches (1016 mm to 2450 mm) to scalp up to 70 tons of free-flowing bulk material per hour. Available to 3-A, USDA, FDA, BISSC and other sanitary standards, the units can be disassembled rapidly for thorough wash-down.

A range of accessories is available including clean-in-place spray heads, anti-blinding devices, quick-release clamshell lids for rapid screen changes, and an automatic long-term lubrication system for gyratory motor bearings.