Gilson Silent Sifters® significantly reduces noise levels compared to other rotary sifters when sieving mineral aggregates and other materials. Innovative design and better materials decrease personnel exposure to noise with no loss to particle sizing accuracy and performance. The optimum size range of the Silent Sifters is from 1in to No. 635 (25mm to 20µm). State departments of transportation often prefer the rotary sifter for aggregate gradations.
Rotary sifters do not require the sieve stack to be clamped in place. The test sieves are placed in the cabinet, then tilted back to the testing position using the side knob. Two rubber-covered stainless-steel drive rollers continuously rotate the test sieve stack. Mechanical hammers tapping against each sieve aid passage of particles through the mesh.
Silent Sifters instantly convert to use 8in, 12in, 200mm or 300mm ASTM or ISO test sieves. Sieve stacks up to 26in (660mm) high can include from six 12in diameter full-height sieves to twenty 8in diameter half-height sieves including a pan.
Test sieves and drive mechanisms are enclosed by the cabinet to safeguard against injury. Bearing and rod safety covers further eliminate exposed moving parts below the cabinet for greater compliance with OSHA regulations. The tightly sealed cabinet uses sound-deadening materials and a proprietary design to limit noise during operation. The enclosure also suppresses airborne respirable nuisance dust to further protect personnel and permit easy cleanup. A door interlock switch stops the sifter if the door is opened.
A digital countdown timer/controller precisely controls operation up to 99 minutes ± 1 second. The timer features a pause function so the test cycle can be suspended and resumed with no loss of test time. Time is shown on the large, bright 0.5in (126mm) LED display. A five-second audible alarm sounds at completion. If the door is opened during operation, the door safety switch stops the sifter and resets the timer.
Rugged, CNC machined MDF board cabinet is dense and impact-resistant with tight seams. Commercial grade heavy-duty hinges allow the full-width door to open wide for easy handling of the sieve stack. The sturdy powder-coated stand is constructed of heavy ASTM A 513 steel tubing and rolls on 4in hard rubber locking casters for easy positioning. A dependable 1/4hp continuous-duty motor drives the system. Tapping hammer assemblies are 6061 aluminum alloy with Ultra High Molecular Weight (UHMW) Polyethylene heads.
SS-21 Silent Sifter® has special sound-deadening materials lining the cabinet. Noise levels are 7 to 10dB lower than any other rotary sifter for enhanced worker protection and no loss in performance or accuracy.
SS-22 Silent Sifter® II is the newest and quietest Gilson Rotary Sifter. This model uses advanced soundproofing materials and cabinet design to be 16 to 18dB quieter than standard rotary sifters and 8 to 10dB quieter than our SS-21 Silent Sifter®. Heavy-duty, over-center latches pull doors tightly against cabinet gaskets to ensure a tight, dust-proof seal and enhanced noise control.
- Lower operational noise levels than any other rotary sifter
- Advanced design and materials for better performance and longer life
- DOT preferred particle sizing method
- Large swivel casters roll easily and lock securely
- Gilson Silent Sifter® (115V/60Hz or 230V/50-60Hz)
- Floor Stand with locking swivel casters