Comprehensive range:
A wide selection of screw augers for transporting a huge, differing range of dry & loose through to semi-dry materials in horizontal and inclined industrial applications, covered by open & closed, shafted & shaftless options and even units with separation and dewatering capability. With steel options: stainless; acid-resistant; carbon alloy and abrasion-resistant (Hardox for example), to combat corrosion, and abrasion, and to adhere to required regulations.
Housing Options:
Whether transporting material to or from equipment, or an integral part of a machine or vessel, our auger housing range covers all applications. All these housing options can use either shafted or shaftless screws.
Closed: Used for transporting material for inclined applications (up to 45°), where sealing off the material from the local environment is required to stop the material escaping or outside element contamination, or for safety reasons in certain situations.
The material is commonly drawn at the lower end from a conical, hopper-bottomed vessel but can also have various entry places along the auger’s length.
Open: Being open, enables the material to be drawn along its entire length or at various points, lending itself for clearing material from machines and vessels, and is generally used in horizontal applications. Covers can be fitted to stop the material escaping or outside element contamination, or for safety reasons in certain situations.
To cover the many applications and materials, 3 open options are available:
U Shape: Auger diameter opening size. Generally used for clearing material from machines.
V Shape: Provides a greater size of opening (approx. 140% of auger diameter). Generally used for clearing vessels and difficult flowing materials.
Omega shape: Provides a smaller size opening (approx. 60% of auger diameter). Generally used for free-flowing materials, clearing gullies & drains, and in applications where the screw needs to be retained.
Screw Options:
Differing material characteristics, as well as the application, require specific screw designs:
Shafted: Has a shaft running through the centre of the screw that provides rigidity and strength and has a bearing at each end that supports the screw to help combat wear. Generally used for inclined applications, where a rigid screw is necessary, and also for transporting materials that are unlikely to clog around the shaft.
Shaftless: There is no shaft through the screw, providing an unhindered path for the material to travel along the auger. Used in most applications but typically for difficult materials where shafted screws are unable to transport them, for example, stringy products; PET bottles; wood chips; certain aggregates etc.
Screw Pitch:The pitch of the screw spiral (flight) determines the speed of material travel and potential force exerted; the closer the pitch, the slower the travel but the greater the force. This principle is adopted in our screw presses and dewatering augers, where the pitch progressively gets tighter towards the outlet, which creates greater compaction.
Tapering: The screw flight outside diameter progressively gets smaller and has a similar effect as having a tighter pitch as it forces the material through a smaller orifice.
Dewatering and Separation:
Both open and closed housings are used for Dewatering & Separation.
Open Non-compaction in a U shape with options of wedge wire or punch plate screens, either full length or a section at the outlet.
Closed: Can produce compaction with wedge wire or punch plate screens using either reduced flight pitch or tapering within the screen at the outlet.
Compaction integrated modules: Some of our non-compaction dewatering and separation equipment can be equipped with compaction modules to create an integrated two-stage unit that moves the dry material from the non-compaction screen (first stage) with an open U-shaped clearing auger to a closed dewatering module (second stage) to extract more liquid. Adding this module will depend on whether the input slurry/product can be compacted.
With such a simple design, these compaction modules can be fitted to existing non-compaction equipment (not necessarily SMG) to separate and dewater to a higher level cost-effectively.
For more details on how closed auger compaction works, visit Screw Press.
Throughput:
Is determined by several factors:
- Material to be transported
- Lift and distance to be transported
- Screw flight pitch
- Auger diameter with sizes ranging from 80 – 1,200mm
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