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Screw Conveyors: Types, Components and Configurations

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Introduction

This article takes an in depth look at screw conveyors.

Read further to learn more about topics such as:

  • What are screw conveyors?
  • Components of screw conveyors
  • Screw conveyor configurations
  • Screw conveyor considerations
  • And much more...
Screw Conveyor

Chapter 1: What are Screw Conveyors?

Screw conveyors, also referred to as auger conveyors, are industrial machines meticulously engineered to efficiently move large quantities of granular materials like powders, grains, and granules. They can also transport semi-solids, liquids, and materials that do not flow easily. By eliminating the necessity of manual material handling, they significantly boost operational productivity. The fundamental parts of a screw conveyor include a rotating screw shaft placed inside a trough. When this screw shaft rotates, it propels the material forward in a straight path. Screw conveyors can be set up for transportation along horizontal, vertical, or inclined routes.

Basic Screw Conveyor Operation

Diverse types of screw conveyors are crafted to manage different material properties. Materials in bulk can be abrasive, non-flowing, fluidizable, absorb moisture (hygroscopic), or pose hazards. Screw conveyors proficiently handle products such as cereals, fertilizers, animal feed, ash, gravel, cement, and solid waste.

The Archimedes screw, dating back to approximately 250 B.C., represents the earliest screw conveyor form. Originally devised as a primitive positive displacement pump, it was employed to lift water from lower levels to upper irrigation channels. Through the years, the design and driving mechanisms of Archimedes screws have been enhanced to improve their effectiveness, sturdiness, and speed, all while maintaining the foundational concept of the original invention.

Archimedes Screw

Chapter 2: What are the components of screw conveyors?

Screw conveyors are an essential mechanical conveying system widely used across industries such as agriculture, mining, chemical processing, food production, and bulk material handling for efficient, controlled movement of granular or powdered solids. Understanding the main components of screw conveyors—and their various design types—ensures optimal selection, improved operational efficiency, and minimized maintenance for applications involving bulk material transport. Below, we detail the primary screw conveyor parts and engineering variations crucial for industry professionals, equipment engineers, and buyers evaluating conveyor solutions.

Components of Screw Conveyors

Conveyor Screw (Screw Blade or Helix)

The conveyor screw—sometimes called the screw blade, auger, or helix—is the driving force behind the screw conveyor’s movement of bulk materials along the trough or housing. This rotating shaft features a broad, helically wound blade called the flight, which efficiently conveys materials from the feed point to the discharge area. Conveyor screws work on the Archimedean principle, moving solids one pitch forward with each complete rotation. The pitch is defined as the axial distance between the crests of adjacent flights. A well-chosen screw design ensures consistent, metered flow, gentle conveying, and reduced material degradation or buildup.

Conveyor Screw

Types of screw conveyors are categorized by their flight and pitch design:

Standard Pitch Screw Conveyors

Standard pitch screw conveyors possess a pitch equal to the screw diameter, providing a versatile and effective option for moving free-flowing or slightly sluggish materials in horizontal or gently inclined installations (typically below 10°). These conveyor systems are common in grain handling, industrial processing, and wastewater treatment plants, and are known for their reliability and uniform material flow.

Standard Pitch

Variable Pitch Screw Conveyors

Variable pitch designs feature flights that gradually increase in pitch from the inlet to the discharge. This allows enhanced capacity at the feed end and prevents material surges or bridging, making them popular for metering applications and in screw feeders where controlling bulk density and volumetric flow is essential. Industries such as plastics, food manufacturing, and chemicals frequently use variable pitch conveyors for feeding controlled quantities into downstream equipment.

Variable Pitch

Short Pitch Screw Conveyors

Short pitch conveyor screws, with a pitch just two-thirds the screw diameter, are specifically engineered for use in steeply inclined, vertical, or high-lift conveyor setups. Their reduced pitch prevents material rollback (sometimes called flushing) and enhances efficiency when handling dry, free-flowing materials—ideal for feeders or vertical elevators found in construction and mining operations.

Short Pitch

Half Pitch Screw Conveyors

Half pitch variations have a pitch equal to half the screw’s diameter. These are optimal in steeper, vertical, or inclined screw conveyor systems to counter gravity and maintain positive material movement, especially in vertical auger elevators, silo dischargers, and feed dosing equipment.

Half Pitch

Long Pitch Screw Conveyors

Long-pitch conveyor screws (1.5 times screw diameter) are best for handling liquids, semi-fluids, or fluidized bulk solids. They enable rapid transport, high-speed operation, and improved agitation and aeration of materials, often used in wastewater processing, pulp and paper industry dewatering, or moving large volumes with minimal energy consumption.

Long Pitch

Double Flight Screw Conveyors

Featuring dual sets of helical flights offset by 180°, double flight configurations double the capacity per revolution and provide stable, continuous bulk flow. These are frequently installed in mixing blenders, twin-screw extruders, or high-capacity conveying where surge-free discharge and gentle material handling are priorities.

Double Flight, Standard Pitch

Tapered Flight Screw Conveyors

Tapered flights combine constant pitch with a gradually widening flight width from inlet to outlet, enhancing controlled intake and even distribution. These screw conveyor systems are favored for handling lumpy, heterogeneous, or bridge-prone materials and are excellent for lump breakers, heavy mineral handling, or metered feeding from hoppers and bins.

Tapered Flight

Mass Flow Screw Conveyors

Mass flow designs incorporate a conical screw at the infeed, with variable pitch along the blade. Intended to ensure uniform discharge and prevent material stagnation or rat-holing, these screw conveyors are commonly installed below silos, bins, or storage hoppers in industries dealing with powders, granules, or bulk solids like cement, sand, or flour. They maintain consistent throughput and minimize the risk of blockages.

Mass Flow Conveyor Screw

Screw flights can also be differentiated based on their fabrication method:

Helicoid Flight Screw Conveyors

Helicoid flights are formed from continuous steel strips cold-rolled into helices. This method produces flights with a durable, hardened structure, suitable for high-volume, low-cost production. Helicoid screw conveyors excel at moving semi-abrasive and free-flowing materials like limestone, cement, grain, sand, or fertilizer. Their work-hardened surface reduces wear, and the smooth flight minimizes product residue and contamination risks, supporting OSHA and FDA sanitary standards.

Helicoid Flight Screw Conveyor

Sectional Flight Screw Conveyors

Sectional flights are custom-fabricated from steel discs precisely cut and pressed into helical segments. These segments are then welded to a central pipe, producing strong uniform thickness and optionally increased abrasion resistance for handling highly abrasive materials—such as glass cullet, alumina, or minerals—in heavy-duty industrial environments. Sectional flights are ideal for custom screw conveyor applications demanding thicker or speciality alloy construction for harsh chemical, high-temperature, or abrasive bulk flows.

Sectional Flight Screw Conveyor

Specialty screw flight designs enhance conveying and mixing performance:

Cut Flight Screw Conveyors

Cut flight conveyors have regularly spaced notches along the outer edge of each screw flight, allowing increased mixing, agitation, and aeration of bulk material. These designs reduce compaction and promote even blending, frequently used to handle materials prone to sticking or packing such as hydrated lime, dried milk, talc, or pharmaceutical powders.

Cut Flight

Cut and Folded Flight Screw Conveyors

Combining cut notches and upturned folds on the flight edge, cut and folded screw conveyors offer the highest degree of mixing and aerating for lightweight, cohesive, or heat-sensitive powders. This flight geometry facilitates homogeneous temperature distribution, ideal for heating, cooling, or chemical conditioning in food, chemical, or polymer processing.

Cut and Folded Flight

Ribbon Screw Conveyors

Ribbon flights, with an open design between the inner edge of the flight and the shaft, are well suited to viscous, sticky, or caking materials—such as adhesives, sludges, or pancake batter—that typically wrap around a solid shaft. Ribbon screw conveyors minimize build-up and clogging. Both single and double ribbon flight models are available:

Single Flight Ribbon Screw Conveyors

These models are engineered for sticky materials or substances with high moisture, preventing shaft fouling and facilitating cleaning in processing lines and batch mixers.

Single Flight Ribbon

Double Flight Ribbon Screw Conveyors further improve agitation, blending, and uniform discharge for cohesive or dry products. Their unique alternating ribbon structure creates a countercurrent, providing exceptional mixing and consistent product quality. This makes them popular in dry blend, bakery, chemical, and food processing plants.

Double Flight Ribbon

Standard Pitch Single Flight Screw Conveyors with Paddles

In these conveyors, paddles inserted between the flights disrupt the regular mass flow and provide gentle yet effective blending, suitable for bulk solids requiring precision mixing, de-agglomeration, or controlled agitation (e.g., pellets, animal feed, or specialty chemicals).

Standard Pitch Single Flight with Paddles

Standard Pitch Screw Conveyors with Paddles

These conveyors offer adjustable and helical paddle arrangements along the screw shaft, with up to four paddles per pitch for maximum agitation. While providing the most aggressive mixing and aerating, energy consumption may be higher, so they’re employed when process efficiency or uniformity in blending is a top priority.

Standard Pitch with Paddles

Screw Conveyor Handedness

The handedness of a screw conveyor—right-handed vs. left-handed—determines the direction of material flow and governs how screw conveyors integrate with existing material handling systems. Right-handed screws (clockwise rotation) are the industry standard, while left-handed screws (counterclockwise rotation) are reserved for specialized applications or space constraints. Proper selection and installation help maximize efficiency and minimize product loss or contamination during transfer.

Left-Hand and Right Hand Conveyor Screws

Trough (Housing or Enclosure)

The trough, or conveyor housing, encases the conveyor screw to contain conveyed materials, prevent dust emissions, and provide vital structural support. A properly selected trough ensures safe, hygienic, and reliable operation—protecting both the screw and your facility. Trough selection is based on application, material abrasiveness, process sanitary requirements, and installation environment. Reinforcements, saddles, removable covers, and integrated feed or discharge ports further enhance performance and operator access for cleaning or maintenance.

Industrial applications benefit from these common trough designs:

U-shaped Trough

The U-shaped trough is the most widely used and adaptable conveyor trough type, valued for its ease of access, cost-effectiveness, and implementation in general industrial and bulk solids applications, such as grain handling and powder transfer. Types include:

  • Angle Flange Trough
  • Formed Flange Trough
  • Double Formed Flanged Trough
  • Formed Channel Trough
  • Drop Bottom Trough
  • Flared Trough
U-Shaped Trough

Rectangular Trough

Engineered for abrasive or high-volume material movement (such as cement, clinker, or glass sand), the rectangular trough’s unique “dead bed” allows an initial protective layer of conveyed material to form on the walls. This reduces wear, prolongs trough service life, and minimizes dust, making it a top choice for harsh environments, cement plants, and mining.

  • Angle Flange Trough
  • Formed Flange Trough
  • Angle Flange – Top and Bottom Trough
  • Formed Flange – Top and Bottom Trough
Rectangular Trough

Tubular Trough

Tubular (or tube-type) troughs provide an enclosed system for dust-tight, weatherproof, contamination-free, and sanitary conveying. Well-suited to food, pharmaceutical, plastics, or chemical industries, tubular troughs handle larger screw diameters, minimize external contamination, and support high-capacity and inclined screw conveyor operation. Their close screw fit and defined volume tubing optimize precision metering, especially when feeding packaging or downstream processing machinery. The tubular design is offered in:

  • Non-split tubular troughs (one-piece construction for rigidity and easy sanitation)
  • Split tubular troughs (two flanged halves, ideal for inspection and maintenance)
Tubular Trough

Jacketed troughs are specialty designs for heating or cooling the bulk material as it moves through the conveyor. Double-wall construction allows utility media, such as steam or coolant, to circulate between layers, making jacketed troughs invaluable for temperature-sensitive applications (e.g., plastics extrusion, chemical reactors, or food processing where thermal control is crucial).

Jacketed Trough

Trough Materials

The selection of trough material is vital for equipment longevity and safe, efficient conveying:

  • Mild Steel – A cost-effective option for general-purpose screw conveying in agriculture, bulk solids, and non-corrosive chemical transfer.
  • Stainless Steel Grades 304 and 316 – Stainless steel screw conveyors resist corrosion, pitting, and chemical attack in food, pharma, wastewater, or wet environments. Grade 316 excels in severe environments due to enhanced chemical resistance.
  • Abrasion Resistant Steel Grades AR235 or AR400 – Used for severe abrasion (e.g., sand, minerals, mining waste), AR steels offer a wear life two to four times greater than mild steel, extending equipment service life.
Stainless Steel Trough

Hanger bearings support the rotating conveyor screw inside the trough, reduce shaft deflection, and enable effective alignment across extended screw lengths. Available in bronze, plastic, and specialty composite materials, hanger bearings are chosen based on load, speed, temperature, and chemical compatibility for the application (e.g., food-safe, high-temperature, or abrasive environments).

Hanger Bearing

Couplings connect screw sections, ensuring stable transfer of torque while accommodating minor shaft misalignments due to thermal expansion or long conveyor runs. Properly specified couplings minimize mechanical stress, vibration, and extend conveyor system lifespan.

Couplings

The internal collar is a precision tube at the screw shaft’s end, providing alignment and facilitating standard drive or bearing connections without custom machining.

Internal Collar

End lugs located at the start and end flights prevent product accumulation and ensure unobstructed flow, supporting both product quality and cleaning.

End Lug

Electric Motor

Every screw conveyor relies on an electric motor drive, sized according to material characteristics (density, viscosity, abrasiveness), conveyor load, speed, and duty cycle. Placing the drive at the discharge end facilitates efficient bulk movement, reduces tension on screw flights, and extends component service intervals. Motors should conform to industry standards (NEMA, IEC) for performance and safety compliance.

Drive Assembly

The drive assembly typically comprises a heavy-duty gearbox or shaft-mounted speed reducer, V-belt or direct coupling, and an industrial electric motor. Options include:

  • Shaft-mounted gear reducers for direct torque transmission
  • V-belt drives to introduce speed variability and shock absorption
  • Chain and sprocket drives for remote or multi-speed requirements
  • Variable Frequency Drives (VFDs) enabling precise speed and throughput control to match process conditions or batch sizes

Gearmotor-driven screw conveyors are often favored for their compactness, efficiency, and ability to accommodate high start-stop cycles, essential for smart factories and process automation in modern industries.

Screw Conveyor Drive

How to Choose Screw Conveyor Components for Your Application

When specifying a screw conveyor system, engineers and buyers must consider factors such as material type (bulk density, abrasiveness, moisture content), required capacity, conveyor length and incline, sanitation needs, and process integration. Selecting the right type of screw, trough, material of construction, and drive assembly directly impacts product quality, efficiency, and long-term maintenance costs. Consulting with experienced screw conveyor manufacturers ensures the best fit for demanding applications in agriculture, mining, food processing, and industrial manufacturing. Requesting CAD drawings, product datasheets, and case studies enables buyers to compare features and select the conveyor system that optimally meets their requirements.

Leading Manufacturers and Suppliers

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    Chapter 3: What are the different screw conveyor configurations?

    Screw conveyors can be categorized based on the different flow paths they provide for transporting bulk materials:

    Horizontal Screw Conveyors

    Horizontal screw conveyors represent the most straightforward type of screw conveyors. They can accommodate a diverse range of bulk material types and efficiently distribute materials to different locations through multiple inlets and discharge points. These conveyors are typically designed to have a trough loading capacity ranging from 15-45%.

    Trough loading denotes the maximum depth at which the trough can be filled without causing excessive wear or stress on the screw conveyor components. This capacity depends on the characteristics of the bulk material being transported and is crucial for proper sizing of the screw conveyor. Generally, the trough loading can be higher for lightweight, free-flowing, and non-abrasive materials, while it needs to be lower for thick, heavy, and abrasive substances.

    Horizontal Screw Conveyor

    Inclined Screw Conveyors

    Inclined screw conveyors offer an inclined path that eliminates the need for additional conveying equipment for transporting bulk materials to or from an elevated surface. An alternative to this type is the use of two pieces of conveying equipment: one piece of equipment for horizontal transportation and one for vertical transportation. However, this setup is expensive and consumes more space.

    An inclined screw conveyor can have an angle of inclination ranging from 0° to 45° above the horizontal. As this angle increases, both the efficiency and load capacity of the screw conveyor tend to decrease, and the power requirement rises due to gravitational pull and material fallback. To mitigate these negative effects, a reduced pitch conveyor screw (such as one-half or two-thirds of the screw diameter) is used, which offers a better conveying surface and minimizes material fallback. Additionally, tubular troughs help in reducing material fallback.

    Inclined Screw Conveyor

    Vertical Screw Conveyors

    Vertical screw conveyors transport bulk materials on vertical paths and very steep inclines with an angle of inclination greater than 45° above the horizontal. They are also space- and cost-efficient in transporting bulk materials. Controlling the amount of bulk material fed to the screw conveyor is critical for vertical screw conveyors to maintain a constant speed, reduce wear and power consumption, and increase the conveyor efficiency. Hence, bulk metering devices such as screw feeders are necessary.

    Vertical Screw Conveyor

    Here are the other types of screw conveyors:

    Shaftless Screw Conveyors

    Shaftless screw conveyors eliminate the need for a conveyor shaft screw and internal bearings, reducing material build-up and flow obstruction. This makes them ideal for conveying sticky, viscous, and sluggish materials. These conveyors simplify the conveying process and enhance efficiency, and they are often used to move products from mixers, centrifuges, and filters.

    The shaftless spiral in these conveyors allows for higher filling rates and lower RPMs, resulting in less wear and reduced maintenance needs. Spirals can be constructed from various materials, including a special Swedish steel known for its exceptional mechanical properties and high tensile strength.

    Designed for handling challenging materials, shaftless spiral conveyors are effective for transporting municipal dewatered sludge, wastewater screenings, grit, industrial sludges, and sticky, viscous, and stringy materials.

    One advantage of shaftless spiral conveyors is their ability to transfer materials efficiently and directly – whether horizontally, on an incline, or vertically – into another conveyor. Their durability can be extended with liners, such as Duraflo SPX®, which feature a wear indicator and can be easily replaced.

    Shaftless screw conveyors can be fully enclosed to prevent spillage and control odors. Moreover, their direct drive mechanism ensures clean and efficient material movement.

    Shaftless Screw Conveyor

    Live Bottom Screw Conveyors

    Live bottom screw conveyors are designed to regulate and control the volume of bulk material being discharged from hoppers, bins, and silos. Typically installed at the bottom of these containers, they feature multiple tapered, variable pitch, or mass flow conveyor screws to manage fluctuations in material volume at the inlet. These conveyors can also function as a screw feeder to supply another screw conveyor.

    Live Bottom Screw Conveyor

    Flexible Screw Conveyors

    Flexible screw conveyors are made up of a shaftless conveyor screw and a flexible tubular trough made from UHMW polyethylene. Since both conveyor screw and trough are made from flexible and bendable materials, flexible screw conveyors can transport bulk materials over a wide range of distances, angles, and elevations.

    Flexible screw conveyors feature a unique design that saves space by allowing the bulk material path to be easily routed, and enabling convenient placement of the electric motor and discharge outlet. The conveyor screw can be fitted with either a round or flat spiral profile, offering added flexibility and strength. For higher feed rates, a flat spiral profile is used.

    Flexible Screw Conveyor

    Chapter 4: What factors should be considered when designing or selecting a screw conveyor?

    When selecting and designing a screw conveyor, it is essential to consider the characteristics of the bulk material to be handled.

    • The material of construction is critical for abrasive materials.Hence, the screw conveyor must be constructed from a hard and abrasion-resistant metal such as hardened steel, carbon steel, or rolled steel. Reducing the angle of inclination below 15° will minimize the abrasive wear induced on the screw conveyor components.
    • Fluidizing materials tend to "flood" and flow uncontrollably when agitated or aerated. The easiest way to avoid this is to reduce the conveyor speed. Shorter pitch conveyor screws can also be used to slow down the speed of these materials.
    • For sticky, hygroscopic, and viscous materials, a ribbon-type flight or shaftless screw conveyor must be used to prevent material build-up. The components may be lined with PTFE to keep materials from adhering. The internal components of screw conveyors handling hygroscopic materials must be free from air and vapor to prevent the absorption of moisture.

    It is important to know additional properties of the bulk material, such as density and particle size. Estimating the volumetric and mass feed rate is also crucial. This information helps determine the structural and strength requirements and the appropriate sizing for the screw conveyor.

    Finally, the distance and environmental conditions along the material's path must be taken into account.

    Summary

    • A screw conveyor efficiently transports bulk quantities of materials. The materials may be granular solids, semi-solids, liquids, and non-flowing solids.
    • The components of the screw conveyor include the conveyor screw, trough, hanger bearings, couplings, internal collar, end lugs, and electric motor.
    • The types of screw conveyors (based on the pitch and flight design) are the standard pitch screw conveyors, variable pitch screw conveyors, half-pitch screw conveyors, long pitch screw conveyors, short pitch screw conveyors, double flight screw conveyors, tapered flight screw conveyors, and mass flow screw conveyors.
    • The special types of screw conveyors that have different geometrical designs are the cut flight screw conveyors, cut and folded screw conveyors, ribbon screw conveyors, standard pitch flight screw conveyors with paddles, and standard pitch screw conveyors with paddles.
    • The types of screw conveyors according to the method of construction of their flights are the helicoid flight screw conveyors and the sectional flight screw conveyors.
    • Screw conveyors may be right-handed or left-handed. The handedness determines the material flow direction when the conveyor screw is rotated in a specific direction.
    • The main types of troughs are the U-shaped trough, rectangular trough, and tubular trough. A U-shaped trough is more common. Tubular troughs are ideal for inclined screw conveyors.
    • The types of screw conveyors (based on flow path) are the horizontal screw conveyor, inclined screw conveyor, and vertical screw conveyor. Other types of screw conveyors include the shaftless screw conveyor and the live bottom screw conveyor.
    • The nature, maximum particle size, and density of the bulk material, volumetric feed rate, mass feed rate, and the distance and environment of the path must be considered in designing, selecting, and operating a screw conveyor.

    Leading Manufacturers and Suppliers

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      Table of Contents

      Chapter 1: What are Screw Conveyors?

      Chapter 2: Components of Screw Conveyors

      Chapter 3: Screw Conveyor Configurations

      Chapter 4: Screw Conveyor Considerations

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