Drop Bottom Doors, Screw Conveyor
General
Archimedean Screw Conveyors are an essential part of many conveying and storage systems. Being simple and robust in design and easily maintained, screw conveyors provide a low cost, versatile conveying capability with many bulk solids handling applications in manufacturing and processing factories. Guttridge U-trough screw conveyors and tubular screw conveyors have been continuously developed over many years and are available with a wide range of options to suit every requirement. The well proven, modular design ensures easy assembly, installation and maintenance. It also allows any configuration to be easily and quickly built up to suit a customer's exact requirements in both mild steel (painted or galvanised) and stainless steel.
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 screw conveyor. The rate at which material is conveyed can be fairly accurately controlled by varying the screw conveyor flight design, speed and percentage loading - useful for feeding process machinery at a pre-determined rate for example. Lengths up to 50m can be accommodated with the use of intermediate hanger bearings and the materials of construction can be varied to suit the material being conveyed and site conditions. The following sketches illustrate some of the ways in which the Archimedean screw 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 Screw Conveyors in many different ways to suit customer requirements. Please click a heading below to display 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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Casing
Features:
- Pressed steel with double flange each side for rigidity
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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Flighting - Cut and Folded*
Features:
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Flighting - Paddle Blades*
Features:
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Flighting - Ribbon Flighting*
Features:
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General Options
Options:
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Intermediate inlets/outlets
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Rotation sensor mounted at tail end
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Back mixer (pictured) with meshing paddles to create a thorough mixing action
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Special bearing arrangements
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Intermediate support wear strips
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Air flap for grinder discharge applications
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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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Hinged Lids
Options:
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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
Product Suitability
Guttridge Screw Conveyors are in operation in many different industry sectors and countries handling a huge variety of bulk solids materials, a small range of examples follows.
- Acetate
- Chocolate Flakes
- Coal
- Corn
- Fertilisers
- Flour
- Fly Ash
- Glass
- Granules
- Herbs
- Limestone
- Meals
- Milk Powder
- Miscellaneous Feed Ingredients & Products
- Ores
- Plastic Pellets
- Rice
- Salt
- Sand
- Spices
- Sugar
- Sunflower Seeds
- Tea
- Wheat
Additional Notes
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Tubular Conveyors will generally give greater throughputs for a given size, but are subject to other constraints.
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Conveyor throughput and general performance is dependent on many factors - please seek advice before finalising your conveyor specifications.
Please contact us for details of the many options available and for special purpose requirements.
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