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OLDS ELEVATOR™ Publications

A Radical Approach to the Vertical Conveyance of Bulk Materials: the OLDS ELEVATOR™

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4. Contrasting the OLDS ELEVATOR™ with conventional screw elevators

Conventional Screw Elevators, Bulk Solids Handling, Volumetric Feeder

Figure 11 – Flow rate comparison for OLDS ELEVATOR™ and traditional screw-driven elevator.

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Prototype testing of a 100 mm diameter elevator indicated this new method has at least twice the flow capacity of a conventional vertical screw elevator (figure 11), uses less energy, creates less dust and has lower noise levels.

With the obvious similarities between the OLDS ELEVATOR™ and vertical screw conveyors (both employ the use of screws and cylindrical casings) it is important to identify the differences in how they handle bulk materials. Screw conveyors are ubiquitous in the field of bulk material handling. Their operation has developed little over the 2,200 years since Archimedes discovered the utility of elevating water with an inclined screw. Screws are effective horizontal conveyors and metering feeders for a broad range of bulk materials. However, as screw conveyors are inclined their handling capacity deteriorates and the limit of gravity sliding down the face of the screw flight is quickly reached. At inclinations steeper than 30º more than half of the spectrum of bulk materials requires an alternate elevating technology, as screw conveyors are no longer practical. Where a screw conveyor's performance is best when horizontal, the OLDS ELEVATOR™'s perform best at 90º. OLDS ELEVATOR™ can also be tilted and tests at 45 degrees recorded no reduction in delivery rate. Combined with metering capabilities, this provides a powerful new tool for the process engineer.

CEMA's Screw Conveyors for Bulk Materials (Book No. 350) lists 433 different bulk materials that are suitable for conveying via screw. Less than 37% (160 of 433) of these bulk materials are indicated to be suitable for handling by vertical screw elevators. A partial list of bulk materials is shown in the following table that have been successfully elevated by OLDS ELEVATORS™, although they are specifically identified as unsuitable for elevation via a vertical screw elevator by CEMA, the Conveyor Equipment Manufacturers Association.

Initial tests demonstrated one machine handled a wide range of materials from wet and dry silica sand to shredded rubber tyres without modification.

CONTINUE >> Performance and features summary: A Radical Approach to the Vertical Conveyance of Bulk Materials: the OLDS ELEVATOR™

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Material deemed unsuitable
for conventional screw
elevators by CEMA		 Elevated by
OLDS ELEVATOR™
Barite Yes
Beans - Navy, Dry Yes
Bread Crumbs Yes
Carbon Black – Pelletized Yes
Casein Yes
Cocoa Beans – Whole Yes
Cocoa Beans – Nibs Yes
Corn – Seed Yes
Gypsum - Calcined, Powdered Yes
Gypsum – Calcined Yes
Plastic powder Yes
Sand - Dry Bank, Damp Yes
Sand - Dry Bank, Dry Yes
Sand - Foundry, Shake-Out Yes
Sand – Silica Yes
Soap - Beads or Granules Yes
Soap - Detergent Yes
Soap - Powder Yes
Soybean - Whole Yes
Sulphur Yes
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OLDS ELEVATOR™ LLC
12 B Park Ave.
Hudson, NH 03051

Call 603.882.8899
Fax 603.882.8855



OLDS ELEVATOR™
Advantages
1. Olds Elevator Innovative
Material Elevation
  • No Segregation
  • No Breakage
  • No DustMore…
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Dissatisfied by conventional methods with bucket elevators, screw elevators, pneumatic conveyors and inclined belt conveyors? OLDS ELEVATOR™ has
developed a radical concept that overcomes all the obstacles of elevating while providing engineering design, elevator manufacturing, installation and service.
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