12 Common Conveyor Flight and Pitch Types

12 Common Conveyor Flight and Pitch Types

We’ve been manufacturing quality auger flights or screw flights in our own factory based in China for over 10 years. Many brands are working with us because of the best auger flights we produce. We are aim to deliver your screw flights that leave no gap on center tube and promise to match your flight ends at the most affordable prices.

Here are the 12 common conveyor flight and pitch types that we can make, but we can do more than that. We can customize all these types based on your business and provide fully Fabricated Engineered Solutions to all industries including Mining, Quarry, Agriculture and Civil Construction.

Screw Flight and Pitch Types (Sectional Screw Flight Types), Features, and Applications

Standard Pitch, Single Flight Conveyor Screws

Conveyor screws with a standard pitch and single flight design are characterized by their simplicity and efficiency. The term “standard pitch” means that the distance between each flight, or the helical blade of the screw, is equal to the diameter of the screw itself. This configuration ensures a balanced and even transfer of materials along the conveyor’s path.

These screws are predominantly utilized in the movement of bulk materials in a horizontal direction. Thanks to their design, they facilitate a smooth flow of materials such as grains, sand, small stones, and other similar particulate substances. Their straightforward design makes them an economical and popular choice for industries looking to transport materials efficiently over short to medium distances.

The versatility of standard pitch, single flight screws also extends to inclines, where they can be used effectively up to angles of 10 degrees. This makes them suitable for applications like loading bulk into processing machines or hoppers and elevating materials to different levels within a production environment. Their ability to operate at slight inclines adds a layer of flexibility to their implementation in various industrial settings.

Advantages of Standard Pitch, Single Flight Designs

The design of standard pitch, single flight conveyor screws offers several advantages. Primarily, the consistency in the spacing of the flights ensures that the force exerted on the material is uniform, leading to stable and predictable material flow. This is particularly important in industries where precise material handling is crucial, such as in food processing or chemical manufacturing.

Moreover, the simple design translates to lower manufacturing costs and easier maintenance. The lack of complex parts reduces the risk of mechanical failures and downtime, which is critical for continuous production environments. The durability of these screws also means that they can handle a wide range of materials without needing frequent replacements or repairs.

In addition to economic benefits, these screws are also known for their efficiency. They consume less energy compared to other more complex systems, which not only reduces operational costs but also supports industries in meeting their sustainability goals. By minimizing energy consumption, companies can lower their carbon footprint, aligning with global efforts towards more sustainable manufacturing practices.

Applications and Implementation

The implementation of standard pitch, single flight conveyor screws is widespread across various sectors. Industries such as agriculture, mining, and construction rely heavily on these systems to transport bulk materials efficiently. In agriculture, they are used to move grain from storage silos to milling operations or from trucks into storage bins. In mining, they transport raw extracted materials to processing areas or load them for transportation.

Furthermore, their implementation in construction materials manufacturing, such as in cement or asphalt production, demonstrates their robustness and adaptability. These industries benefit from the conveyor’s ability to handle abrasive materials like sand and gravel, which are integral components of concrete and asphalt.

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Variable Pitch, Single Flight Conveyor Screws

Variable pitch, single flight conveyor screws are designed with a unique feature: the pitch between each flight increases progressively. This design is particularly effective for controlling the flow of material being transported. The increasing distance between the flights allows for a gradual and controlled release of material from storage containers like hoppers, bins, or silos.

These screws are commonly used in the manufacturing and processing industries where precise material handling is necessary to maintain consistency and quality. For example, in food production, these conveyors can regulate the amount of grain being fed into a milling operation, ensuring that the mill operates efficiently and consistently. Similarly, in the chemical industry, they can manage the feed rate of raw materials into mixing chambers, preventing overloading and promoting thorough mixing.

The main advantage of using a variable pitch design is its ability to provide uniform withdrawal. This uniformity is crucial when dealing with free-flowing bulk materials that can otherwise bridge or rat-hole in their storage containers. By ensuring a steady flow, these screws help maintain a continuous production line, reducing bottlenecks and enhancing overall operational efficiency.

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Short Pitch, Single Flight Conveyor Screws

Short pitch, single flight conveyor screws feature a pitch that is reduced to two-thirds of their diameter. This modification allows them to create more contact points with the material being transported, which enhances their ability to move materials vertically or on an incline. The increased number of flights within a given length of the screw means that materials are lifted more quickly and efficiently, even against gravity.

These conveyors are ideal for applications where space is limited and steep conveying angles are required. They are particularly useful in industries such as construction and mining, where they can elevate materials like crushed stone or coal to higher points within the operation. Similarly, in the agricultural sector, these screws can transport grain from lower levels of storage facilities to higher ones, facilitating easier loading into silos or processing equipment.

The short pitch design not only assists in vertical and inclined applications but is also utilized in some variable pitch feeder systems. In these systems, the reduced pitch helps initiate the movement of material from a static state, complementing the variable pitch portion of the screw that manages the flow rate. This combination can be particularly effective in ensuring smooth and consistent material flow from start to finish in the conveyor system.

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Standard Pitch, Tapered Single Flight Conveyor Screws

Standard pitch, tapered single flight conveyor screws are designed with a unique tapering feature where the outside diameter of the screw gradually increases from half to full diameter. This specific design is tailored to enhance the efficiency of screw feeders used in various industries. The tapered configuration allows for a more controlled and uniform withdrawal of free-flowing bulk materials from storage units such as hoppers, bins, or silos.

This type of screw is particularly effective in applications where material bridging—a condition where materials clump and obstruct flow—can occur. The gradual increase in diameter helps to disrupt the bridging and ensures a steady flow of materials. Industries such as agriculture for seed feed, plastics for resin pellets, and food processing for granular materials like sugar or salt benefit significantly from this design. It allows for a smooth transition of materials from storage to the processing or packaging stages without clogging or jamming.

Furthermore, the tapered design contributes to a reduction in mechanical strain on the screw feeder system by distributing the material load more evenly along the length of the screw. This not only enhances operational efficiency but also prolongs the lifespan of the equipment, reducing maintenance costs and downtime.

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Standard Pitch, Single Ribbon Flight Conveyor Screws

Standard pitch, single ribbon flight conveyor screws feature a unique design where there is intentional space within the flight as well as around the central pipe. This space is crucial for minimizing the collection and buildup of viscous and sticky materials, which can cause blockages and slow down the material handling process. This design is especially useful in handling products like molasses, meat or poultry paste, and other semi-solid materials that are prone to sticking.

The single ribbon flight configuration provides several benefits, including improved ease of cleaning and maintenance, which is essential in industries adhering to strict hygiene standards, such as food processing, pharmaceuticals, and chemical manufacturing. The open space within the flight structure prevents materials from becoming trapped, reducing the risk of contamination and ensuring a consistent product quality.

Moreover, the design of single ribbon flight screws reduces the power required to drive the conveyor, as there is less resistance from material buildup. This efficiency not only cuts energy costs but also enhances the sustainability of the operation. It allows industries to maintain high throughput rates while managing energy use effectively, aligning with environmental and economic goals.

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Standard Pitch, Double Flight Conveyor Screws

Standard pitch, double flight conveyor screws feature a design where the pitch, which is the distance between each flight, matches the outside diameter of the screw. This configuration is similar to that of the standard pitch, single flight screws. However, a distinctive feature of the double flight design is the addition of a second set of flights, placed 180 degrees apart from the first. This dual-flight arrangement enhances the conveyor’s ability to provide a more even and consistent discharge of bulk materials.

The primary advantage of this design lies in its ability to handle larger volumes of material more effectively, reducing the risk of overloading any single flight. This makes it highly suitable for industries where large quantities of materials like agricultural grains, mining aggregates, or recycling materials need to be processed and transported efficiently. The even distribution of material load also helps in minimizing wear and tear on the conveyor system, thus extending its operational life.

Additionally, the double flight design helps in maintaining a balanced and stable flow of materials, particularly important in processes where material consistency affects the quality of the end product. This design is beneficial in environments such as food processing plants or chemical manufacturing, where precise material handling is crucial.

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Half Pitch, Single Flight Conveyor Screws

Half pitch, single flight conveyor screws have a pitch that is half the diameter of the screw. This design creates a tighter spiral and more frequent contact with the material, which is essential for effectively moving materials in inclined or vertical applications. The reduced pitch increases the frequency of flights along the screw, enhancing the conveyor’s grip on the material, which is particularly beneficial when moving materials upward against gravity.

This type of screw is commonly used in industries where space constraints require materials to be moved vertically, such as in wastewater treatment plants or compact manufacturing facilities where vertical integration of material transport is necessary. The half pitch design is also beneficial in scenarios where precise control over material feed is required, such as in controlled feeding systems where variable pitch designs are also used.

The tighter flight spacing allows these conveyors to efficiently handle a variety of materials, from fine powders to small aggregates, ensuring they are lifted smoothly without backsliding, which is a common challenge in steeper conveyance applications. This capability makes half pitch, single flight screws an ideal choice for facilities that need to maximize the efficiency of their space while ensuring reliable material handling.

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Standard Pitch, Single Flight with Paddles Conveyor Screws

Standard pitch, single flight with paddles conveyor screws incorporate a unique addition of adjustable paddles between the screw flights. This design is specifically tailored to enhance the mixing process during material conveyance. By allowing the placement of up to four paddles per pitch, this type of screw provides flexibility in how thoroughly materials are mixed together, making it suitable for a variety of industrial applications where blending of components is required.

These conveyor screws are commonly used in industries such as agriculture for mixing feed ingredients, chemicals for combining different powdered or granular chemicals, and food processing for blending spices or other dry ingredients. The ability to adjust the paddles allows operators to customize the mixing intensity according to the specific needs of the materials and desired outcome, ensuring a uniform mixture.

The gentle handling of materials by the paddles also helps prevent damage to delicate components, making this screw type ideal for handling sensitive materials that might degrade under harsher conditions. Additionally, the use of paddles enhances the efficiency of the mixing process, which can lead to reductions in processing time and energy consumption.

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Standard Pitch, Single Cut Flight Conveyor Screws

Standard pitch, single cut flight conveyor screws are designed with notches cut at regular intervals on the outer edge of the flights. These notches play a crucial role in enhancing the mixing and agitation capabilities of the screw. This design is particularly beneficial for processes that require more than just transportation of materials; it ensures that materials are actively mixed and agitated as they move along the conveyor path.

The cut flight design is effective in applications such as the construction industry for mixing cement and other building materials, or in environmental applications such as the mixing of sludge in wastewater treatment facilities. The notches create turbulence within the conveyed material, which helps to promote a more homogeneous mixture and can prevent the settling of particulates.

This type of screw is also valuable in processing industries where different materials need to be thoroughly combined before further processing. The agitation provided by the notches helps to ensure that no single component settles or separates, maintaining consistent quality and texture of the final product.

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Standard Pitch, Paddle Conveyor Screws

Standard pitch, paddle conveyor screws feature adjustable paddles that are arranged in a helical pattern around the diameter of the central pipe. This innovative design allows for aggressive mixing and controlled flow of bulk materials, making it particularly useful in industrial settings where thorough mixing is crucial. The ability to adjust up to four paddles per pitch provides operators with considerable control over the intensity and thoroughness of the mixing process.

This type of conveyor screw is ideal for industries such as chemical processing, where precise mixing of ingredients can significantly impact the quality of the final product. It’s also beneficial in the food industry for combining various powdered or granular components into a consistent blend. The helical arrangement of the paddles ensures that materials are not only pushed forward but are also turned over, leading to a more uniform mixture.

Moreover, the adjustable nature of the paddles allows this conveyor to be tailored to different materials and viscosities, enhancing its utility across various applications. This adaptability is crucial in industries where materials with varying characteristics must be processed efficiently while maintaining high-quality standards.

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Standard Pitch, Single Cut and Folded Flight Conveyor Screws

Standard pitch, single cut and folded flight conveyor screws are designed with notches at regular intervals along the outer edge of the flights, combined with lifting paddles. This configuration is engineered to promote aggressive mixing and agitation of bulk materials. The notches create additional turbulence, enhancing the mixing effect, while the folded paddles lift and fold the material, ensuring that it is thoroughly blended.

These conveyor screws are particularly effective in applications where materials need not just to be transported but also require significant mixing to maintain or achieve homogeneity. This makes them suitable for sectors like the construction industry, where they can be used to mix building materials such as concrete or mortar efficiently. They are also valuable in agricultural settings for the preparation of animal feeds, where ingredients need to be evenly distributed to ensure nutritional consistency.

The combination of cut and folded flights provides a dual action that enhances the screw’s capability to handle different types of materials, from light powders to heavier granules, without compromising on the quality of mixing. This type of screw is particularly useful for handling materials that tend to clump or segregate, as the aggressive agitation helps to break up clumps and distribute all components evenly.

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Mass Flow Conveyor Screws

Mass flow conveyor screws are engineered to address the challenges of evenly withdrawing bulk materials from storage units such as hoppers, bins, or silos. This type of screw employs a sophisticated design that combines an internal cone with variable pitch flights. The variable pitch aspect means that the space between each flight increases along the screw’s length, allowing for an increasing volume of material to be conveyed with every turn of the screw.

Design and Functionality

The internal cone at the center of the screw plays a critical role in directing the flow of material toward the outer edges of the screw, ensuring that the entire cross-section of the material column is actively moving. This feature prevents material bridging and rat-holing, common issues in silo discharge where materials can form tunnels or remain stuck at the sides, leading to uneven flow and potential blockages.

By integrating variable pitch flights, the mass flow screw provides a gradual increase in the amount of material moved, facilitating a steady, controlled release. This controlled release is crucial for processes that require a consistent feed rate, such as in the chemical, food, and pharmaceutical industries, where precise dosing and consistent material quality are necessary for product uniformity.

Applications and Benefits

Mass flow screws are particularly useful in applications where the material to be moved is free-flowing and the consistency of the material output is paramount. They are widely used in the manufacture of plastics, where pellets need to be fed into an extruder at a constant rate, and in the milling industry, where grains are moved from storage to the milling apparatus.

One of the significant benefits of using mass flow screws is their ability to prevent segregation of different particle sizes. This is essential in industries where the blend of materials impacts the quality of the final product. For instance, in the food industry, ensuring that spices or additives are uniformly distributed throughout the product batch is crucial for maintaining taste and quality standards.

Operational Efficiency

In addition to providing uniform material flow, mass flow screws are designed to operate with high efficiency, minimizing energy consumption and wear. The design allows for a lower operational speed while maintaining effective material movement, which reduces wear on the screw and extends the life of the equipment. This not only results in lower maintenance costs but also increases the overall reliability of the material handling system.

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Summary of the different types of Conveyor Flight and Pitch Types

TypeFeaturesFunctionCommon ApplicationsKey Considerations
Standard Pitch, Single FlightEqual diameter and pitchTransports bulk material horizontally or on slight inclinesHorizontal screw conveyors, inclines up to 10 degreesCost-effective, easy maintenance
Variable Pitch, Single FlightIncreasing pitch with each flightProvides uniform withdrawal from hoppersScrew feeders for free-flowing materialsIdeal for preventing material bridging
Short Pitch, Single FlightPitch reduced to 2/3 of the diameterEfficient on inclined and vertical conveyorsInclined and vertical screw conveyorsEnhances material lift on inclines
Standard Pitch, Double FlightSecond set of flights added opposite the firstMore even discharge and handling of more materialHigh-volume material handlingReduces overloading and wear
Half Pitch, Single FlightPitch reduced to half the diameterEfficient vertical or inclined material handlingVertical and steep incline conveyorsPrevents backsliding of materials
Standard Pitch, Tapered Single FlightTapered diameter from 1/2 to fullUniform withdrawal from hoppersFeeders in chemical, food industriesAvoids clogging and ensures steady flow
Standard Pitch, Single Ribbon FlightSpace within and around the flight to reduce buildupMinimizes collection of viscous materialsHandling sticky or viscous materialsReduces cleaning time and effort
Standard Pitch, Single Flight with PaddlesAdjustable paddles between flightsGentle and thorough mixingMixing bulk materials in various industriesCustomizable mixing intensity
Standard Pitch, Single Cut FlightNotched at regular intervalsPromotes mixing and agitationMixing and agitating bulk materialsCreates turbulence for better mixing
Standard Pitch, PaddleAdjustable paddles in helix around the center pipeAggressive mixing and controlled flowChemical mixing, food processingAdjustability for different materials and viscosities
Standard Pitch, Single Cut and Folded FlightNotches with lifting paddlesAggressive mixing and material liftingConstruction materials, agricultural feedsEnhances mixing and prevents segregation
Mass FlowInternal cone and variable pitchUniform withdrawal increasing volume with each flightFeeders in plastics, grain millingPrevents material segregation and ensures consistency

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