HORIZONTAL VIBRATING SCREENS

Whilst enjoying immense popularity for many years on small horizontal and inclined screens, STAR TRACE is the first company in the world to perfect this simple drive arrangement on large horizontal and inclined screens.This single development has resulted in tremendous advantages as far as reduced maintenance, compactness and simplicity are concerned. Besides the simplicity of the drive, many other features have been incorporated to provide a machine which is specifically designed for heavy duty applications, long life, and low operating and maintenance costs, at a competitive price.The standard range of screens is presented later in the brochure, and these are normally available on short delivery.

The advantages of STAR TRACE's Horizontal Vibrating Screens is that use of the following equipment has now been rendered unnecessary:

• External drive, with vee-belts or cardan shafts.
• Oilbath oscillators, with synchronising gears and oil leaks.
• Motor support stand, or overhead structure for motor support.
• Snubbers - the screen-mounted drive has eliminated the need for snubbers to reduce damage to vee-belts and external motors during the large oscillations that normally occur during stopping.
• Bearing failure is limited to the bearing itself. Particles from a failed bearing cannot circulate in an oilbath and cause possible damage to other bearings and synchronising gears.
• Campactness - screens can be positioned very closely with a minimum of space wastage.
• A vibrator motors needing reconditioning can easily be exchanged for a standby unit, with a minimum of downtime.
• ue to the absence of gears and vee-belts, the units use less power than conventional drives.

The inherent simplicity of the drive arrangement ensures the minimum possible maintenance.

The screens can be adapted by the factory to meet special requirements regarding plant layout, screen performance and environmental constraints.

Specify your particular requirements, or enquire about the range of features, accessories, painting systems and materials of construction currently available.Screens are frequently manufactured in various grades of stainless steel for the chemical industry and protected by special painting systems for severe conditions in the mining industry.

These rugged, heavy duty units are exceptionally well insulated against the ingress of dust and water. Their IP 55 protection ensures that the units can operate in wet conditions, such as in washing and dewatering applications.

A very generous holding-down bolt design is incorporated. A common complaint in the past has often been that vibratory motors tended to come loose.

A great deal of thought and attention has been given to the fastening design of these motors. When compared with other makes of vibratory motors, the holding-down bolts are often in excess of 50-100% over designed. This, together with stress-relieved and machined surfaces and correctly torched nuts and locknuts, results in an exceptionally secure vibrator fastening system.

When two vibratory motors of the same frequency are fixed to a rigid common base, which is freely suspended, or supported and run in opposite directions to each other, they automatically synchronise to produce a straight line motion. When this motion is applied to a screen, the result is a horizontal action screen suitable for screening, conveying and dewatering of a large variety of products in limited headroom situations.

1. Individually Replaceable Cross Members
   

   Instead of the old type of fabricated screen decks, all STAR TRACE screens now incorporate a unique bolted deck arrangement. This means that when wear occurs and deck replacement become necessary, only the worn sections are replaced. This is far easier than stripping the entire screen and handling large, heavy fabricated frames. When polyurethane panels are to be fitted to screens up to and including 1 200 mm in width, the panels are located directly into the individually replaceable cross members. The panel and cross member, by direct impingement of the material being screened, is prevented. On larger screens, the cross members can be rubber-lined for protection.

2. Angle Runner System for polyurethane Modular Units
   

   One of the most common complaints with conventional frames for polyurethane panels is the premature wear of the pinholes in the deck, with resultant loosening of the panels. On screens over 1200 mm in width, easily replaceable angle runners are provided to secure the polyurethane panels. With wear, only those runners affected need be replaced, thus reducing costs and downtime.

3. Flat Bar Runner System for Woven Wire Decks
   

   As in the angle runner system for polyurethane decks, the flat bar stringers are bolted to the cross members, resulting in an easy to maintain deck arrangement.

4. Automatic Alignment of Tensioning Bolts for side Tensioned woven wire Decks
   

   The illustration show clearly the simplicity of this device. The swivel half cups automatically align the tensing bolts to the exact angle to accommodate various wire thicknesses.

5. Stress Relieving
   

   The entire welded fabrication is stress relieved to ensure that all residual welding stresses are removed.

6. Built-in, Lined Feed Boxes and Discharge Lips
   

   The simplicity of the design of these built in items ensures that feed boxes and discharge lips cannot come loose.

7. Screening Surface
   

   The screens can be fitted with a variety of screening surfaces, such as punched plate, tensioned woven wire, polyurethane or rubber mats, plug-in polyurethane panels, or wedge wire panels.

• Cross members can be utilized as spray pipes. These can be galvanized internally to reduce corrosion.
• Screens can be mounted on a ‘Rosta’ support system for prolonged life and reduced vibration transmission, particularly on shut down.
• Screens can be mounted on isolation beams to remove 80% to 90% of transmitted vibrations.
• Drain panels can be incorporated in sides or back plates of screens where the feed contains very large volume of water.
• Screens can be totally enclosed for handling dusty materials and can be fitted with carrying decks (bottom pans) to reduce headroom.