VIBROSIEVE

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      1.Operation
      2.Unique Features
      3.Applications
      4.Specifications

The Vibroscreen is a circular unitised gyratory screen. It is the largest of its type available today, with three-component multiplane mechanical vibration.

The motivation is through a motor with a double extended shaft, fitted at both ends with eccentric weights. The whole drive assembly is mounted on a circular base by rugged springs which allow the unit to vibrate freely, and at the same time, the springs prevent transmitted vibration reaching the floor area on which the machine stands. Screens can be mounted one on top of the other within the screening assembly. The Vibroscreen is suitable for all types of screening operations within these four broad catagories:

Dry Separation
Division of different materials on the basis of their particle shape.

Dry Classificatin
Division of materials into precise sized fractions.

Solid-Liquid-Separation
Dewatering of solids and clarification of liquids.

Solids Classification
Separation of sized fractions in a liquid medium. Highest screening efficiency is achieved by controlling the patterns of movement of solids on the screen surface. Control is achieved by varying the position of the bottom eccentric weight as shown in the diagram.

The material is fed on to the centre of the top screen and the oversize material

is moved by the multiplane motion to the periphery of the screen to be discharged through a tangential outlet. The undersize particles and / or liquids pass through the screen to produce fine sized fractions or clarified liquid.

The tangential component of the motion-imparted to the solid on the screen is controlled by the angular position of the top and bottom eccentric weights. The screening pattern can therefore be controlled by altering the angle of the eccentrics and some general examples of the type of control are shown...

If the mass of the top eccentric is increased, this will increase the horizontal throw on the screen and will cause the oversize material to discharge at a faster rate.

An increase in the bottom eccentric mass will increase the vertical component of the motion. In the case where 'near size' blinding of the screen is a possibility, it is desirable to promote maximum vertical motion in order to dislodge particles which may be held (pegged) in the interstices of the screen.

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High Capacity, Minimum Space

By varying the angular displacement of the bottom eccentric weight, the screening pattern can be optimised for each job, thus giving a high capacity per square foot of screen surface.

Adaptability

Discharge ports can be rotated to meet layout requirements and individual frames between screen desks can be tailored to suit the needs of that fraction.

No Transmitted Vibration

Motion is transmitted through the screening assembly and vibration is completely absent from the screen base. No special foundations are required and many screens are operating suspended from ceiling hangers. By the same token, the machine can be made portable and its operation is silent.

Long Screen Life

Sharples have developed a special screen holding device anda taut screen cloth is achieved on assembly. The cloth does not flex and moves rigidly with the screen assembly.

Minimum Screen Blinding

The vertical component of the vibration given by the bottom eccentric weight ensures that blinding of the screen by particles close in size to the screen cloth aperture is minimised. Ball trays/Kleen Rings can be added if necessary to alleviate screen blinding.

Low Operating Costs

The Vibroscreen uses only low power motors, since all their energy is used to create screen motion, none is wasted in vibrating a massive frame and foundation.

Bottom Eccentric Lead

The tangential component of the motion imparted to the solid on the screen is controlled by the angular position of the top and bottom eccentric weights. The screening pattern can therefore be controlled by altering the angle of the eccentrics and some general examples of the type of control are shown...

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