November 24, 2014

Industry directs design toward harsh environments and operational situations where powerful forces of abrasion are constant. Mining detritus and aggregate are resolved into different grades by these systems, washed and screened for storage or transport. Gentle sorting or sieving approaches the issue of moving from a raw initial state to a sorted final state through a different approach. Instead of the sharp movement and eccentric cyclic action adhered to in mining and heavy industry, the machinery tends toward gyroscopic motion. Looking at this process in greater detail, the gyratory screen solution embraces a closed-system approach where orbital movement is key in classifying and screening media.

The economy of movement required to operate a wet or dry screening circular movement mechanism involves the placement of a central shaft, an axial point where vertically mounted motors are installed, top and bottom, to introduce the necessary torque. Eccentric movement is introduced to the multiple stages of stacked screens by incorporating unbalanced loads to each vertical plane. A combination of angled tilt and vibration across two planes coaxes different sorting patterns. In considering the characteristics present in the tilt and vibration characteristics as the mechanism rotates at maximum velocity, we can deduce that alterations to the lead angle are the most direct manner in altering the screening action to suit differing applications.

The suggested applications include but are not limited to the sorting of pharmaceutical products, the classification of seeds and grain, and the sieving of recycled matter that has been pulverized, for example, recycled tires that are ground down for use on highways or used as a combustible powder in a power plant. The gyratory action is also popular in shredding wood particles, tiny chunks of wood pulp that are torn down and condensed for usage as wood board in the construction industry.

All of the tangential movement, the off-center horizontal motion and vertical tilting characteristics of a gyratory screening mechanism blend to form a cost-effective solution to grading, classifying up to five factions of materials across the stacked sorting media. The separators used in this gentler industry vary from 24-inches up to 70-inches, and the optimization factor created by this movement, the translation of horizontal screening to a gyratory operational dynamic, can be upward of 70%. Here are some of the advantages to be aware of in switching to a gyratory mode of operation.

  • Optimized for fragile loads
  • Uses off-center weights on a shaft instead of bruising vibrations
  • Adapts quickly for wet or dry screening
  • Sorts up to five graded fractions
  • Low running costs and easy maintenance

Versatility and absolute control lays at the heart of the gyratory sifting mechanism.

Screening Technology Pty Ltd T/AS Hawk Machinery

Address: 7 Lantana St Blackburn North Vic 3130
Contact Person: Bohdan Blaszczyk
Phone: +61 3 9877 7777
Fax: +61 3 9877 8177
Mobile: 0411 099 989


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