Screw Conveyor

Industries:

• Food & Ingredients: flour, starch, sugar, salt, meal, additives
• Agriculture & Feed: grains, oilseed meal, premix, pellets
• Chemicals & Minerals: calcium carbonate, talc, soda ash, pigments, fertilizers
• Mining & Aggregates: dry fines, filter cake (with shaftless), sand, bentonite
• Biomass & Energy: pellets, sawdust, fly ash (dry), bio-char
• Recycling & Plastics: regrind, flakes, pellets
• Environmental / Waste: dewatered sludge (shaftless), screenings

Typical Materials: Flour, Starch, Sugar, Salt, Grain, Meal, Ash, Fly Ash, Cement Powder, Sand, Bentonite, Plastic Pellets, Chips, Wood Dust, Pelletized Fertilizer.

Not Ideal Without Modification: Very wet, highly cohesive, large fibrous, explosive dust without protection, materials prone to rapid caking (unless conditioned).

• Layout: Horizontal, slight incline (≤20° typical), steep incline (derated), vertical (with special design), multi-inlet / multi-discharge.
• Types: Shafted helicoid flight, sectional flight, ribbon flight (heat transfer or sticky), paddle, shaftless (for stringy / viscous).
• Trough Forms: U-trough with bolted covers, tubular (pipe) screw for better containment, jacketed (thermal).
• Materials: Carbon steel, SS304, SS316, duplex (on request), AR wear strips, polymer liners (UHMW, PTFE).
• Drives: End direct-drive gearmotor, shaft-mounted reducer, chain & sprocket (retrofit), VFD speed control.
• Seals: Lip seals, lantern ring, air purge, stuffing box, mechanical seal (critical containment).
• Bearings: End thrust bearings (heavy-duty roller), intermediate hanger bearings (UHMW / bronze / ceramic / graphite), or eliminated (shaftless).
• Covers: Quick clamp, bolted, hinged, gasketed (dust-tight).

• Controlled volumetric feed and discharge
• Modular sections for scalable length
• Optional shaftless design for sticky / stringy materials
• Low dust emission with sealed covers and purge options
• Custom pitch (full, short, variable) for uniform loading and surge control
• Wear / corrosion resistant liners and flight hardfacing options
• Easy-access inspection and clean-out ports
• VFD-ready drive to optimize throughput vs. power draw

• Proper fill factor reduces wasted torque
• Optimized hanger spacing lowers frictional losses
• Short-pitch in incline sections prevents fallback, lowering re-convey energy

• Precision-aligned trough flanges reduce bearing misalignment
• Hardfacing or AR liners extend life in abrasive service
• Shaftless eliminates intermediate hangers (major wear point) for problem materials

• Polished stainless internal surfaces
• Removable flight sections or quick-slide covers
• CIP spray bar or dry air purge for cross-contamination control

• Fully covered to mitigate dust and operator exposure
• Interlocked covers (option) and rotation guards
• Explosion mitigation (monitoring + vents or isolation for high Kst dust)

• Modular rebuild (replace flights or liners without replacing entire body)
• Condition-based maintenance with bearing temp & vibration sensors
• Extended service intervals via optimized seal/liner selection

• Stainless steel (SS304 / SS316) or duplex materials
• Shaftless spiral (cold-rolled or wear alloy)
• Ribbon / paddle / cut-flight / variable pitch flighting
• Hardfacing (tungsten carbide, chromium carbide overlay)
• Wear liners: UHMW, AR plate, ceramic tiles, PTFE
• Seals: Air purge, stuffing box, mechanical seal, nitrogen purge
• Dust-tight / hygienic quick-clamp covers
• Heated or cooled jacketed trough
• Multiple inlets & proportioning gates
• Multiple discharges with slide or rotary valves
• Load cells for mass flow indication (paired with density factor)
• Bearing temperature, vibration, torque, and speed sensors
• Explosion venting, flameless vents, or isolation valve interface
• CIP spray bar or dry cleaning lance ports
• Integrated control panel / PLC / SCADA connectivity

1. Standard design efficient up to about 20–25°. Above that, capacity drops sharply—consider vertical screw (special) or alternate elevator.
   

1. Helicoid is cold-formed continuous (fewer joints, smoother flow). Sectional is individual segments welded (flexible for variable pitch, heavy-duty or special alloys).

1. High moisture, sticky sludge, fibrous, stringy, or irregular particles that would bind on center pipe or clog hanger supports.