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SMG - Internal Rotary Screen
Internal Rotary Screens are high output, low running cost, small footprint, and non-Compaction separation units that can separate to a high level in an uncomplicated way with a revolving horizontal cylindrical Sieve Screen. Equally applicable for moderately small installations through to very large, high throughput projects. Apart from the Motor and Gearbox and certain Sieve Screen types, these machines are a complete Stainless-Steel construction to combat corrosion, allowing them to be sited inside or out. The Screen is direct driven (no belt or chains etc.) through a gearbox by a fractional Hp motor and the bearings are automatically lubricated, enabling the machine to run 24/7 at a very economic running cost, requiring very little maintenance.
These machines are compact in size for the high output they produce. The separation process is done by a slow revolving horizontal cylindrical Sieve Screen, and to cover the many applications and separation level requirements this separation method can process, there are three options of Sieve Screen types: Wedge Wire, Mesh, or Punch Plate.
The Separation is done on the internal surface of the Screen that is inclined, with the lower level at the Inlet end. An upstand spiral Auger is attached to the Screens internal working surface that is designed to convey the separated solid element up the incline to the outlet end.
The liquid/slurry to be separated is pumped, or gravity fed into the inlet, starting the separation process. Liquid and solid particles smaller than the Screen gap size start the pass through the Screen and fall into the liquid channel or collection chamber. The solids and any hung-up liquids that remain on the Screen surface are conveyed up the incline by the spiral Auger, which further dewaters, to eventually drop out the outlet chute.
Most applications do not need additional washing systems as the rotating screen constantly flushes the Sieve Screen, clearing any protentional blinding (blockages) with the liquid that has passed through the screen from the liquid/slurry.
The self-cleaning process allows significantly smaller gap size Sieve Screens to be used, enabling a high-level separation for a non-compaction machine.
In applications where the Screen cannot be cleared by the self-cleaning alone, there are options for additional automatic washing, as well as brushes, to ensure the screen is kept clear to maintain throughput and efficiency. SeeFiltration for products to enable the washing water to be recycled
These machines are essentially a moving Rundown Screen, and with the self-cleaning, exposes a clean Screen to the entering liquid/Slurry to be separated, significantly speeding up the separation process, and providing high throughput.
These machines rely on gravity and motion to separate, and being non-compaction, there are limitations:
- Slurries need to be low Dry Matter, simplistically are pumpable.
- The minimum solid particle size removed from the slurry and left in the liquid element is very good, as small as 50 microns in some applications, but the DM of the dry element is low, and non-stackable (needs containing).
- Certain greasy, sticky, and viscous slurries are not recommended as they can adhere to the inner surface of the screen.
Slurry throughput is determined by a combination of three parameters:
- Slurry type and its viscosity:
- We can generally advise
- Machine size:
- Screen sizes by diameter:
- 600mm, 900mm and 1,200mm
- Solid particle size removal from the liquid:
- From 0.05mm – 10.0mm (larger gap sizes can be supplied)