Screening

Screeners are self-contained production screening machines for separating dry materials according to particle size. Through the unique gyratory-reciprocating motion of their near-horizontal screen surface, combined with a positive screen mesh cleaning system, Arcon provides unusually high efficiency and capacity. All of this is the result of continued development throughout hundreds of applications in many industries.

Screener models have a range of one to five screen surfaces, for separations with openings from 12,7 mm to 100 mesh. Numerous innovative design features provide users with unparalleled performance, ease of operation and durability.

Screeners play an important role in Arcon's recycling effort. Applications include grading reground tyres and reusable plastics and assisting in the separations at recycling centres. The long stroke, low frequency motion of screeners enables them to make the required separations while conveying bulk oversize material off the screen surface. This ensures that the screener will not be a bottleneck in the recycling operation.

HOW SCREENERS WORK:

The unique gyratory motion imparts a combination of actions to the material as it passes along the screen surface. It starts with a horizontal circular motion at the feed end, gradually diminishing along the length of the machine to an elliptical path, and finally to an approximate straight-line motion at the discharge end. There is no vertical component to this motion, which allows the material to be kept in constant contact with the screen surface.

1. CIRCULAR MOTION AT FEED END

The gyratory motion at the feed end of the machine begins by immediately spreading the material across the full width of the screen surface to maximise screen utilization - even though the feed is from a single point.

At the same time, this motion stratifies the material, causing the fines to sink down against the screen surface. The particles that are appreciably smaller than the openings quickly pass through at this part of the screen.

2. CHANGING TO ELLIPTICAL MOTION AT CENTRE

As the circular motion diminishes to an elliptical path, the gentle near-horizontal motion causes the fine particles closer in size to the screen mesh - the near-size particles - to fall through the mesh openings.

3. STRAIGHT LINE MOTION AT DISCHARGE END

The nearly linear reciprocating motion at the discharge end of the sreener removes those particles closest in size to the mesh openings while gently conveying the oversize material off the screen. In addition, the unique ability to advance or retard material flow at the discharge end allows further fine tuning to achieve the most efficient and accurate motion for the application.

INSTALLATION OPTIONS

Floor Mounting

The low transmitted forces of the counterbalanced drive allow the unit to be floor mounted in properly designed structures where some other types of equipment cannot. Mounting may be directly on the floor or on an elevated structural steel framework, the elevated position permitting drums or other equipment to be located under the machine. Application engineers can recommend a stand for any specific application.

Cable Suspension

Screens can be cable-suspended from the four corners of the machine, thereby isolating out-of-balance screening forces from the surrounding structure. Accurate counterbalancing of the screener  makes this installation option possible. If the existing overhead structure is not suitable for cable suspension, or is structurally unable to support the cable-suspended unit, the screener can be suspended from a floor-mounted cable support stand. As with conventional cable suspension, this option effectively isolates the horizontal out-of-balance screening forces, helping to minimise costs for new structures as well as permitting the use of older structures which might not otherwise support cable-suspended equipment.