Screw conveyors are used in many industries to transport and distribute flowable bulk solids materials. While one of the oldest and simplest means of conveying products, they are compact, versatile and economical. With certain modifications and/or variations in the mechanical arrangement, screws conveyors can be designed to mix, blend, or agitate. In applications where close control of material flow is critical, the screw conveyor may be used as a highly accurate metering device.
The modular shafted screw conveyor system is highly versatile offering numerous solutions for conveying flowable bulk solids. Shafted screw conveyors are manufactured from mild steel, AR (abrasion-resistant) steel, stainless steel and other alloys, with a suitable surface finishing. They are made up from a U or V-shape trough that is equipped with at least one outlet spout, an end plate at each trough end, helicoid or sectional screw flighting welded on a center pipe bushed at each end, end bearing assemblies complete with shaft sealing unit, a certain number of intermediate hanger bearings depending on the overall length of the screw conveyor, and bolted trough cover sections.
Shafted screw conveyors are equipped with a gear drive that suits the application. Screw feeders or live bottom conveyors with multiple screws in a common housing are available for applications such as bin unloading. Depending on the material to be handled, shafted screw conveyors can be fabricated in a CEMA standard Group 1, Group 2, and Group 3 component construction.
Current CEMA standards cover 6”, 9”, 12”, 14”, 16”, 18”, 20” and 24” diameter conveyor sizes with U-trough. Standard shaft sizes are 1-1/2”, 2”, 2-7/16”, 3” and 3-7/16” diameters, with 2-bolt drilling. While other screw sizes, shaft diameters and V-trough (flared) housings are available, there are no established industry standards.
Group 1, light-duty screws are mainly used to convey powders or granular materials such as: grains and grain by-products; flour milling; in animal feed milling and pet food production; in the plastics industry; and in soap, washing powder and detergent processing.
Group 2, medium-heavy-duty screws are mainly used: in animal feed milling; in wood processing; in the chemical industry, and in environmental technology for both municipal and industrial applications.
Group 3, extra-heavy-duty screws are mainly used in the cement / lime /gypsum, sand, as well as in the mining industry.
- Primed and painted with a high finish enamel paint Standard
- Helicoid or sectional flighting intermittently welded on center pipe
- Trough in modular flanged sections in standard lengths
- Trough feet or saddles for intermediate support
- Flanged end bearing assemblies protected by shaft seals
- Bolted trough covers
- Square inlet/outlet spouts with industry standard drilled flanges
- Screw conveyor drive units mounted at inlet or outlet end
- 2-bolt coupling
- Intermediate hanger bearings, self-lubricating or greased types
- Industrial quality product
- Modular design features ensuring matching spare parts
- Worldwide spare parts availability through WAM subsidiaries
- Special paint finishes such as high temperature or epoxy
- Screws in various configurations (ribbon flight, cut, cut & folded, paddles, others)
- Screws made from special wear-resistant material
- Screws hard surfaced
- Screws in special lengths and larger center pipes to accommodate deflection
- Screws close coupled and clocked to eliminate intermediate bearings
- Flighting continuously welded one or two sides
- Trough in modular flanged sections in special lengths
- Trough liners of UHMW, mild steel, AR steel, wear bars
- Pedestal trough end bearing assemblies
- Clamped trough covers, various clamp styles
- Square, rectangular or round inlet/outlet spouts with or without connecting flange; quantity as required by application and design
- Overflow relief doors
- Special shaft seals (gas or air-purged, grease chamber, others)
- Different drive configurations
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