Advantages and Limitations of Tubular Screw Conveyors

The Wrights Dowson Group has a long-established reputation for designing, manufacturing, and delivering high-quality tubular screw conveyors. With a greater emphasis on manufacturing and maximising output while minimising space, tubular screw conveyors are ideal bespoke solutions in such environments.

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The company offers a bespoke and fully comprehensive design service using the latest CAD and 3D modelling innovations for all types of tubular screw conveyors for multiple industries. These include:

• Heavy-duty grain storage
• Animal feed milling
• Biomass and waste
• Recycling

Typically, a tubular screw conveyor is also used to handle and transport food, pharmaceuticals, chemicals, and other bulk solid materials in manufacturing plants.

Any industry considering employing tubular screw conveyors as part of their manufacturing processes is wise to be fully aware of the advantages and limitations of tubular screw conveyors.

Advantages of Tubular Screw Conveyors

There are several advantages to using this type of screw conveyor:

• There are relatively low manufacturing costs involved compared to other conveying procedures such as belts, pneumatic devices or aeromechanical machines.
• The Wrights Dowson Group can manufacture tubular screw conveyors in various materials, including stainless steel, mild steel or abrasion-resistant material.
• They are highly suitable for conveying dry or semi-fluid bulk materials in an entirely enclosed space, thereby reducing the threat of hazardous contamination, dust, spillage and subsequent waste.
• Tubular screw conveyors require little storage space and can be used in compact environments, making them flexible for smaller manufacturers. In addition, thanks to their design, they can, if needed, be installed at an angle in situations where a height difference needs to be overcome.
• The design is highly versatile and provides a range of solutions for the handling and transporting of granular and powdery materials.
• They are easy to install in-house and require little maintenance and cleaning, thanks to high-quality stainless steel and steel sealing techniques.
• Thanks to their design, they have a long service life, adding to their cost-effectiveness.
• Tubular screw conveyors can be angled from 0 to 90 degrees for flexible movement and transportation. This is also advantageous because they can be used in a horizontal or vertical position and any incline needed to handle particular products. In addition, they can operate with significant pressure differences.
• Tubular screw conveyors can be designed with flights, bearings, covers, inlets, outlets and mountings according to your own specifications and needs.

Disadvantages of Tubular Screw Conveyors

There are a few disadvantages to be aware of when considering this type of machine for your industry, mainly if it may be the case that a different kind of screw conveyor may be more suitable for your needs:

• Tubes and spirals may wear out if this type of machinery is being used to convey more abrasive materials such as coarse sands, sugar and minerals.
• There can be a limited conveying distance of 30m per screw. This can potentially restrict the efficiency of a larger scale manufacturing process.
• Tubular screw conveyors can have a limited capacity. This is in keeping with other conveyors and can depend upon how bulky the transported material is, its density and size, and what speed and pitch the tubular screw conveyor will be operated at.
• Not every type of material can be transported using this type of screw conveyor. It is best to avoid transporting materials with particles that stick together or have high moisture levels or accumulate in the conveyor. This, in turn, causes the conveyor to lock up.

The Wrights Dowson Group can design, manufacture, and deliver a bespoke, long-lasting tubular screw conveyor system ideal for modern-day manufacturing needs. It uses the latest technology combined with CAD and 3D modelling to guarantee a fast project turnaround of any tubular screw conveyor for your business.

The Wrights Dowson Group offers its clients top of the range sales and customer support following the delivery of your tubular screw conveyors. This includes providing component parts, spares, segments and bearings.

If you consider adding a tubular screw conveyor or any other type of screw conveyor to your manufacturing plant, please get in touch.

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For many batch-type processing applications, flexible screw conveyors are an excellent equipment choice. These low-cost conveyors are an attractive equipment option due to their straightforward operation, uncomplicated construction, and relatively low maintenance requirements. In this blog, we look at some of the advantages and limitations of this type of conveyor.

ADVANTAGES OF FLEXIBLE SCREW CONVEYORS

The basic operating principle of a flexible screw conveyor is simple: a metal helical screw rotates within a fixed tube, creating a directional force that moves material up through the tube, from the infeed end of the equipment to the discharge point. The tube and screw are flexible within a defined range and are available in various configurations, each kind suited for the type of material being conveyed.

Flexible screw conveyors can transfer many types of free-flowing and non-free-flowing bulk materials, including powder, granules, and small pellets, as well as small irregular shapes. They take up little floor space and, due to their flexibility, are well-suited for horizontal and vertical conveying.

Flexible screw conveyors are well-suited for batch and intermittent production. Flexible screw conveyors operate most efficiently at a 45° angle, but can also be operated horizontally and at other angles. The conveyor can be outfitted with a mobile base so that it may be easily moved to service processes located in different areas within a facility.

The equipment is easy to clean and has a relatively small footprint. A major advantage of flexible screw conveyors are that they move material through a sealed tube, thus eliminating the problems associated with product dusting during conveyance.

As their name suggests, flexible screw conveyors are exactly that: flexible. The conveyor tube and screw are flexible and can be bent within a recommended bend radius, allowing the conveyor to be routed around fixed obstacles.

LIMITATIONS

Flexible screw conveyors have some limitations which make them not the best choice for some applications. These limitations include the following:

• For fragile or friable materials, particle attrition or breakage could ensue as a result of the 'grinding' of material between the rotating screw and the tube wall.
• Not all materials can be successfully moved via a flexible screw conveyor. Materials whose particles cohere, or which have a high moisture content, can smear and accumulate within the conveyor, causing the screw to lock up. In addition, materials which are coarse and abrasive can also cause accelerated wear and tear on a flexible screw conveyor.
• Limited conveying distance. At UniTrak, we recommend that our UniFlex flexible screw conveyors be used to move materials over distances no greater than 40 feet in length.
• Capacity. Like any other type of conveyor, flexible screw conveyors have limited capacities. Equipment capacity is a function of a number of variables, including material bulk density and particle size, screw pitch and rotational speed, tube diameter and length, hopper size, and the angle at which the equipment will be operated.

UniTrak manufactures the UniFlex line of flexible screw conveyors. Available in two sizes (H75 and H125), these conveyors will move materials over various distances and angles. Optional mobile bases are also available which permit easy movement to any process location. An Easy Clean model is also available which comes with a tilt feature for easy cleaning.

If angled conveying with flexible screw conveyors is of interest to you, our sales team will be pleased to review and discuss your application requirements. Please contact our sales team directly for more information.

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