Double Trough Screw Conveyor with Coated Screw Rotors

Double trough screw conveyor with coated screw rotors manufactured for a customer in the mineral industry.

The mineral industry places some of the toughest demands on mechanical equipment. The materials are heavy, highly abrasive, and often inconsistent in both particle size and density. This means that even robust standard solutions can quickly wear out if they are not specifically designed for the task. One of BEMA’s industrial customers faced precisely the need for a solution capable of handling large volumes of mineral-based material in a continuous process – without compromising on service life, operational reliability, or precision.

The customer required a double trough screw conveyor where two screw rotors run in mesh to ensure a stable and uniform material flow in a medium that may be sticky. At the same time, it was crucial that the screws could withstand the extremely abrasive environment created by the minerals. Therefore, BEMA was tasked with manufacturing a customized solution where construction, material selection, and surface treatment were carefully matched to the operational requirements.

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The Customer’s Requirements

The customer operates in a production environment where minerals are transported in large volumes and under high load. Therefore, they had a number of clear requirements for the equipment:

• High resistance to wear from mineral particles
• Uniform and controlled transport of material
• A solution that could be integrated into an existing process without major modifications
• Minimal maintenance and long service life
• A construction capable of withstanding both mechanical and chemical impact

Since the material is known to be particularly harsh on equipment, it was crucial that the screw rotors received a surface treatment that could significantly extend their service life.

BEMA’s Solution: Double Trough Screw Conveyor with Epoxy-Coated Screw Rotors

BEMA manufactured a double trough screw conveyor in which two screw rotors run in mesh to ensure efficient and stable material flow. This design is ideal for the mineral industry, where the material often tends to compact, clump, or wear unevenly on the equipment.

Focus on Special Coating

To ensure maximum resistance, both screw rotors were coated with a specially developed epoxy designed to withstand heavy wear from minerals. This coating provides:

• A hard and smooth surface that reduces friction
• Significantly extended service life of the screw rotors
• Reduced risk of material build-up
• Improved energy efficiency, as the screws run more easily

The epoxy coating is carefully selected in collaboration with the supplier and tailored to the specific mineral types involved in the process.

Robust Construction of the Double Screw Conveyor

The trough screw conveyor is manufactured in heavy-duty steel and dimensioned for high load. The two screw rotors are precision-manufactured so that the meshing between them is optimal and ensures a uniform flow. The entire unit is constructed with focus on:

• Stable operation
• Easy access for service
• Minimal wear on bearings and gear components
• Long service life in a harsh environment

The Result for the Customer

After installation, the customer experienced a significant improvement in both operational reliability and maintenance requirements. The key benefits were:

• Extended service life of the screw rotors thanks to the epoxy coating
• Stable and uniform material flow, even with varying mineral types
• Reduced energy consumption, as friction in the system was lowered
• Less downtime, as the equipment requires minimal maintenance
• High operational reliability, even under continuous load

The customer particularly highlighted that the coating made a significant difference compared to previous solutions, where wear had been a major challenge.

Conclusion

The double trough screw conveyor with coated intermeshing screw rotors is an example of how BEMA combines technical insight, material understanding, and customized engineering to create solutions that last – even in the most demanding environments. For the mineral industry, where wear is a constant challenge, this solution provides a reliable, efficient, and long-lasting method of handling material transport.

Who Is the Double Screw Conveyor Suitable For?

This double trough screw conveyor with coated intermeshing screw rotors is developed for companies working with heavy and highly abrasive materials. The solution is particularly relevant for:

• The mineral industry
• Raw material extraction
• Cement and concrete production
• Glass and ceramic factories
• Recycling and process industries

Common to these industries is the need for robust equipment that ensures stable transport, high operational reliability, and long service life – even under extreme operating conditions.

FAQ – Double Trough Screw Conveyor with Coated Screw Rotors

What is a double trough screw conveyor with coated screw rotors used for?

A double trough screw conveyor is used for stable and uniform transport of heavy and highly abrasive materials such as minerals. The two screw rotors run in mesh, ensuring smooth flow even in sticky or inconsistent media. The coating protects against wear and significantly extends service life.

Why is epoxy coating important in the mineral industry?

Mineral-based materials are highly abrasive to equipment, which makes a specially developed epoxy coating essential. The coating provides a hard and smooth surface, reduces friction, minimizes the risk of material build-up, and increases both operational reliability and energy efficiency.

What advantages do customers gain from this solution?

Customers achieve longer service life of the screw rotors, lower energy consumption, stable material flow, and minimal maintenance. The solution is designed for continuous operation in demanding environments and results in significantly less downtime compared to standard equipment.