Sifters

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QA Gravity Sifter

The Great Western QA Series Gravity Flow Sifter utilizes the Tru-Balance drive to allow for accurate separation and sizing of a single product stream into two or more particle sizes.

The new Quality Assurance (QA) Series of Gravity Flow sifters, the QA36 and QA46, replace the previous Stainless Steel Sifter models 711 and 821

Features
  • Easy opening and positive sieve clamping provided by reliable pneumatic sieve compression system.
  • Reliable Tru-Balance drive mechanism reduces stress on the sieve frames and lessens motion between the sieve frames.
  • Accurate separation and sizing of a single product stream into two or more particle sizes.
  • Screens are mechanically stretched and bonded to trays for sanitary attachment and superior screen tensions. These sturdy frames can be re-screened indefinitely.
  • Snap-on food grade rubber gaskets for sieve-to-sieve seals. Gasket attachments require no adhesives.
  • 304 stainless steel sieve frames with laser cut internal components ensure precision fit. 316 stainless steel optional.
  • Glass bead blasted finish.
  • Sieve fabrication designed to minimize welding. No bolted or riveted joints. Easily removed insert tray. Interior of sieve is completely accessible for cleaning.
  • Each screen tray assembly includes screen cleaner support backwire. Screen cleaners gently bounce on the backwire to keep the screen apertures open compared to other screeners that use beaters or paddles that result in product abrasion, fracturing fragile ingredients, and causing excessive screen stress.
  • Standard drive frame and guards fabricated from mild steel with powder coated finish. Stainless steel drive components are optional.
 
Benefits
  • The Tru-Balance drive eradicates a need for a massive foundation.
  • Gentle gyratory sifting.
  • Wide range of capacity. Multiple models use from 3 to 9 sieves.
  • Stainless steel QA Lifting Clamps simplify the inspection process by eliminating the need to remove sieves individually.
  • Adaptable to a wide range of products, capacities, number of separations, and screen sizes.
  • Easily customized to suit your installation requirements.
  • Every unit test run and balanced prior to shipping.
  • Easy installation.
  • Low power requirements.
 
Operations

An important benefit of the reliable Tru-Balance drive is that no massive foundation is required. Usually constructed for floor mounting with a top inlet and top discharge, custom configurations for downward directed discharges and multiple floor layouts are easily accommodated.

Its compact, space saving design with light weight components enable the sifter to be easily dismantled for inspection, maintenance or cleaning. The sieve rings and screen trays nest-together and are stacked one on top of the other on the lower dome. The number of sieves required is based on the product, conveying rate and sieve mesh size for each application.

A pneumatic sieve compression system and draw rods compress the stack of sieves between the upper and lower domes and create an air-tight unit. The upper and lower domes are connected to the drive components which are supported on the two sides within a tubular frame.

The Gravity Flow Tru-Balance Sifter uses standard motors and V-belts to turn the two counterweights positioned on the left and right sides of the machine. These weights straddle the machine’s center of gravity and counterbalance the mass of the rotating sifter housing. This unique drive mechanism invented by Great Western ensures a smooth, balanced operation and minimizes building structural demands. The shake stays in the sifter! Mechanically, there are no gear boxes that can leak, and no sifter knuckles to wear out. Using pneumatics, the upper drive frame is raised to open the sifter or lowered to compress and seal the sieve stack.

 
Specifications
  1. QA36
    • Nominal Ø36” (Ø914 mm)
    • Net screen area 5 ft2/sieve (0.46 m2/sieve)
    • Models with 3 to 9 sieves
    • Net sieving area from 15 to 45 ft2 (1.39 to 4.18 m2)
    • One 1 ½ HP (1.1 kw) motor with V-belt drive
    • Drive guards
    • Inlet support bracket and floor stubs are optional
    • Tailings canister is optional
  2. QA46
    • Nominal Ø46” (Ø1168 mm)
    • Net screen area 8.9 ft2/sieve (0.83 m2/sieve)
    • Models with 4 to 9 sieves
    • Net sieving area from 32 to 80 ft2 (3.31 to 7.44 m2)
    • Two 1 ½ HP (1.1 kw) motors with V-belt drives
    • Drive guards
    • Inlet support bracket and floor stubs are optional

Tailings canister is optional

 
Other

Our pneumatic sieve compression and modular interlocking frame simplifies your sanitation and maintenance.

  • Sifter can be opened, sieves completely removed and maintained, and reassembled in minutes and without any specialized tools, minimizing downtime.
  • Pneumatic sieve clamping system allows fast disassembly. The sieves and screen trays simply interlock with one another.
  • Using pneumatics, the upper drive frame is raised to open the sifter or lowered to compress and seal the sieve stack. The pneumatics maintains constant compression while the machine is in operation.
  • Our drive and frame carriers are engineered to minimize gasket wear and eliminate leaks.
  • Stainless steel sieve and product contact zone construction allows cleaning to be accomplished with dry brushing, air cleaning, water wash down or steam cleaning.
  • Dust-tight gasketed construction. No suction requirements.
  • Sieves remove completely. Smooth crack and crevice free bottom dome with easy access to outlet transitions for thorough cleaning.
  • Upper and lower drive carriers remain attached to the drive mechanism.
 

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