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General
Tubular screw conveyors are widely used in many conveying and storage systems, for outdoorapplications, where an inclined flight is required and/or to achieve high throughput efficiency. Enclosing the screw in an outer shell, not only protects the material being handled but also prevents fall back during conveying, even up relatively steep inclines. Tubular screw conveyors are also valued for sterile applications or where material containment is an issue and are widely used in the pharmaceutical and food industries.
Guttridge tubular screw conveyors have been developed continuously over many years and are easily tailored to suit individual requirements. The proven, modular design ensures easy assembly, installation and maintenance. For general industrial applications Guttridge offer tubular screw conveyors in both mild steel (painted or galvanised) and stainless steel to suit material handling requirements and the site environment. A separate range of crevice-free stainless steel conveyors meets the exacting requirements of the food and pharmaceutical industries.
Specification
In general most free flowing powders, grains and pellets as well as many materials with poor flow characteristics can be successfully conveyed with a tubular screw conveyor. Material flow rate is controlled by varying the screw conveyor flight design, speed and percentage loading, with lengths up to 50m accommodated through the use of intermediate hanger bearings.
The following drop downs illustrate some of the ways in which U-trough screw conveyor flighting can be tailored to suit specific applications.
Standard Features and Options
Some standard features and common options are listed below, but we can customise Tubular Screw Conveyors in many different ways to suit customer requirements. Please click a heading below to view a photo and details.
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ATEX*
Features:
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ATEX Certified machinery is available for applications which handle potentially explosive products
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Fully certified ATEX Zones 20 internally, and Zones 21 and 22 both external and internal
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Bearings, End
Features:
- Flange bearings with eccentric locking collar (pictured)
Options:
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Plummer block bearing
- Cooper style split bearings
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Bearings, Intermediate*
Features:
- Standard phosphor bronze
- Intermediate joint shafts feature gudgeon bolt connection
Options:
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Cast iron or stainless steel with ferroform, nylon or morganite inserts
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Gunmetal
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Dumb-bell intermediate shafts
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Cooper style split bearings
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Casing
Features:
- Hot Finished Seamless (HFS) tube, 6mm wall thickness for maximum rigidity and life
Options:
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Drive Options
Features:
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Unique 4-position geared motor drive mounting (pictured)
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Standard geared motor and chain
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The drive size and speed is selected according to the material characteristics and required throughput
Options:
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Drop Bottom Doors
Options:
- Drop bottom doors for easy cleanout
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Finish
Features:
- Painted finish, as standard cream RAL1015
Options:
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Stainless Steel
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Galvanised
- Other colours and special paint systems are available
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Flighting - Continuous, Full Pitch
Features:
- The standard configuration for most applications
- Manufactured from continuously rolled flighting or segmented flighting (depending on flight diameter)
Options:
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A flight with reverse or part pitch flighting is available to prevent product build up at the conveyor end (pictured)
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Segmented flighting manufactured from non-standard materials and thicknesses
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Heavy duty segmented flighting manufactured from abrasion resistant materials
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Flighting - Continuous, Reduced Pitch*
Features:
- Used in flood feed conditions
- Manufactured from continuously rolled flighting or segmented flighting (depending on flight diameter)
Options:
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General Options
Options:
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Intermediate inlets/outlets
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Rotation sensor mounted at tail end (pictured)
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Special bearing arrangements
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Intermediate support wear strips
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Jacketed trough or tubes
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Special high or low temperature environments
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Specially designed and fabricated machines to suit clients
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Outlet Slide Valves
Features:
Options:
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Hand operated
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Electro-pneumatic
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Rack and Pinion
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Motorised
- Troughform (pictured). Minimum residue design
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Overflow Protection
Features:
- Overflow protection is usually by means of a pressure pad located over the outlet to detect material buildup
Options:
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Packing Gland Seal*
Options:
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Packing gland seals
- Air Purge Seals
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* - Optional Equipment
- Animal Feeds
- Bauxite
- Beans
- Burnt Lime
- Calcined China Clay
- Carbon
- Cement
- Ceramics
- Chalk
- Chemicals
- Coarse Chemical Powders
- Coarse Pharmaceutical Powders
- Coffee
- Industrial Coatings
- Metallurgy
- Milk Powder
- Minerals
- Miscellaneous Feed Ingredients & Products
- Pet Foods
- Pharmaceuticals
- PVC
- Rubber
- Crumb
- Salt
- Shredded Plastics and Rubber
- Sinter Ash (wet)
- Sodium Bicarbonate
Please contact us for details of the many options available and for special purpose requirements.
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