Leading Screw Conveyor Design Manufacturers

A screw conveyor is a volumetric conveying equipment. A fixed volume of the material is discharged with each turn of the screw flight. A screw conveyor is used to move product from one location to another, which is always managed by having another conveyor or measuring equipment feed into the entrance. Read More…

Screw Conveyor Design There are a number of factors to be considered when it comes to designing screw conveyors. These factors apply not only with regard to the design of the conveyor itself but also with the facility and how/where the equipment is going to be used.

We are a US based, family owned company specializing in the design and manufacturing of screw conveyors in all configurations: vertical, inclined, shaftless, live bottom, plug screws, feeders, mixers, heating/cooling, FDA/USDA approved, screw presses and more.

Conveyor Engineering & Mfg. Co. $$$

VAC-U-MAX is a manufacturer specializing in screw conveyors and transportation systems, load filling machines, bulk bag loaders, grinders, pulverizers and sifters. The company serves the chemical, food and feedmill industries with highly efficient products.

VAC-U-MAX $$$

ISC Manufacturing LLC has specialized in screw conveyor manufacturing since 1976. Experts in the field of CNC machining, ISC designs & manufactures custom feeders, mixing & drag conveyors, bucket elevators, ribbon & paddle mixers, chutes & more. Our screw conveyor technology is such that our conveyors are capable of conveying, feeding, elevating & mixing. Ask about our service repair center!

ISC Manufacturing LLC $$$

Spiroflow Systems has more than 40 years of experience in the design, manufacture & installation of bulk material handling equipment & systems. Product innovation & a thorough understanding of customers’ needs & objectives keep Spiroflow at the forefront of the industry. Spiroflow Systems offers flexible screw, aero mechanical, pneumatic, tubular cable & chain drag conveyors as well as bulk...

Spiroflow Systems, Inc. $$$

Our top of the line screw conveyors are factory-direct which means you save money in the long run. We are dedicated to your needs and we will work with you every step of the way. We aim to please and you will not be upset with the items you receive. The expertise of our engineers is unsurpassed. Please give us a call today to learn more! We are ready to assist you!

KWS Manufacturing Company Ltd. $$$

Bratney Companies puts our expertise in key industries to work for you, offering equipment, design and construction solutions for your needs. Working closely with you, we will recommend the right piece of equipment to clean, sort, size, store and package the materials in your facility. Then, by working with our sales, engineering and construction teams, we assist you in developing the best...

Bratney Companies $$$
Get Your Company Listed
placeholder image Conveyor Engineering & Mfg. Co. VAC-U-MAX ISC Manufacturing LLC Spiroflow Systems, Inc. KWS Manufacturing Company Ltd. Bratney Companies

The intake of a screw conveyor is generally connected to rotary valves, conveyors, screw feeders, or even additional screw conveyors.

Screw Conveyor

Like screw conveyors, screw feeders or feeders are constantly flood-loaded or full in the entering section.

Factors Influencing Screw Conveyors Design

The Material Classification Code Chart lists typical characteristics of the granular particles to be transported, such as abrasiveness, corrosiveness, and flowability. To choose the best machinery for the intended purpose, it is crucial to understand and carefully examine these characteristics when designing screw conveyors.

Abrasive Particulates

When carrying abrasive grains, screw conveyor compositions may experience extreme wear and strain due to the design of the screw conveyor. As a result, various screw conveyor design types are best suited for abrasion-resistant metals.

The trough of the screw conveyor accumulates and hardens certain transporting materials. They also have the propensity to absorb moisture and pack tightly. The better the ability to prevent build-up incidents in the trough, the closer the space between the trough and the screw. Additionally, a high screw conveyor torque is required to cut through the hardened particles, which is all considered while designing the screw conveyor.

Generation of Static Electricity

Static electricity can be produced throughout the conveying process as the screw augers rotate and shake the bulk materials. Therefore, it is strongly considered when designing to ground the screw conveyor's trough. It may effectively eliminate static electricity by grounding the trough in several places. In addition, lowering the trough loading and the screw conveyor speed can also be very beneficial.

Flammability

Flammable and explosive materials will burn whenever oxygen and ignition sources are present. Screw conveyors should be made of non-sparking materials to stop the appearance of ignition sources. The tight troughs or housings of screw conveyors outfitted with shaft seals are also necessary to keep oxygen outside the machine. The design maybe is aided by filling the inside of the screw conveyor with inert gas, such as nitrogen.

The following properties of the transported bulk material directly determine the design of the conveyor size, speed, and horsepower requirements:

  • Maximum particle size
  • Bulk density
  • Trough loading
  • Material factor
Components of Screw Conveyor

Screw Conveyor Design

Typical Screw Conveyor Design

To design the screw feeder's size and capacity, the screw conveyor's needed capacity and the material should be known at the start; however, the screw size and properties may be unknown.

The following formula can be used to estimate the capacity of the screw conveyor, which has a standard screw flight:

Q= 60 × π⁄4 × D²×S×N×α×ρ×C

In this formula:

  • Q = Screw Capacity in kg/h
  • D = Screw Diameter in m
  • S = Screw Pitch in m
  • N = Screw speed in rpm
  • α = Loading ratio
  • ρ = Material loose density kg/m3
  • C = Inclination correction factor
  • Step 1: Define the Requirement

    • The requirement is defined after specifying the screw conveyor's needed capacity.
    • The screw's design must have a capacity equal to or greater than this figure.

    Step 2: Calculate Capacity of the Conveyor

    • Assume the diameter (D)
    • Define the screw pitch based on the diameter of the screw
    • PitchPitch Length S
      StandardS = D
      ShortS = 2/3 x D
      HalfS = D/2
      LongS = 1.5 x D
    • Estimate the screw's loading ratio based on the characteristics of the material to be conveyed.
    • MaterialMin Loading RatioMax Loading Ratio
      Not free-flowing0.120.15
      Average flowability0.250.30
      Free-flowing0.40.45
    • Values may be higher or lower than average; in extreme situations, the loading ratio may even be higher than 95%.

    Step 3: Compare Calculated Capacity to Max Screw Speed

    The table below lists a few examples of reference maximum screw speed to be used during the design:

    Screw Diameter in m15%30%A30%B45%
    0.16913969190
    0.156613266182
    0.236212262170
    0.256011860165
    0.305811158157
    0.365610456148
    0.41539753140
    0.46509050131
    0.51478247122

    The design can be maintained if the speed estimated in step 2 is less than the maximum speed allowed for the chosen screw diameter. However, suppose the calculated speed at step 2 is greater than the maximum speed for the screw diameter chosen. In that case, the design is unsuitable, and the calculation must be repeated by altering a parameter (often the diameter).

    Step 4: Power Calculations

    P= PH+PN+PSt

    PH is the power required to move the material in the conveyor horizontally.

    PN is the power required to operate the unloaded screw.

    PSt is the power required for an inclined screw conveyor.

    Choosing the Proper Screw Conveyor Design Company

    To make sure you have the most productive outcome when selecting a screw conveyor design company, it is important to compare at least 4 companies using our screw conveyor design directory. Each screw conveyor design company has a business profile page that highlights their areas of experience and capabilities and a contact form to directly communicate with the company for more information or request a quote. Review each screw conveyor design company website using our proprietary website previewer to get an idea of what each company specializes in, and then use our simple RFQ form to contact multiple screw conveyor design companies with the same form.

Screw Conveyor Design Informational Video

 

Screw Conveyors Power Pages

Bucket Conveyors

Bucket Conveyors

A bucket elevator or grain leg is used to move items in bulk. The usage of bucket elevators is widespread, notably in commercial agriculture and mining, and several specialized businesses manufacture bucket elevators and...

Screw Conveyors

Screw Conveyors

Screw conveyors, or auger conveyors, are industrial equipment used in transporting bulk quantities of granular solids (e.g., powder, grains, granules), semi-solids, liquids, and even non-flowing materials from one point to another...

Conveyor Systems

Conveyor Systems

A conveyor system is a method for moving packages, products, supplies, parts, and equipment for production, shipping, or relocation. The different types of conveying systems include pneumatic, screw, belt, and roller. The construction of individual systems depends on the materials...

Conveyor Belts

Conveyor Belts

A conveyor belt is a material handling system designed to move supplies, materials, and components using an efficient and effortless process that saves on time, energy, and cost. The design of conveyor belts includes two motorized pulleys with the conveyor material looped over them...

Flat Belts

Flat Belt

Flat belts are power transmission belts that are flat and made of rubber, synthetic composites, or leather. They are used to transfer rotational power in industrial equipment and conveyor systems. Flat belts have a low profile...

Pneumatic Conveying

Pneumatic Conveying

Pneumatic conveying is a method for transferring bulk materials, like powders and granules, using compressed gas or air, from one processing center to another. Material is moved through an enclosed conveying line or tube using a combination of pressure differential and airflow from a blower or fan...

Bulk Material Handling
Featured Industries