Tube Screw Conveyor

A tube screw conveyor,a specialized type of screw conveyor,is a closed-type mechanical conveying device designed for efficient transportation of bulk materials such as powders,granules,and small pellets.Unlike U-shaped screw conveyors with an open trough,it features a fully enclosed cylindrical tube that houses a rotating helical screw blade,making it ideal for scenarios requiring strict material containment and dust control.

The core structure of a tube screw conveyor consists of four main components:a seamless or welded steel tube(casing),a helical screw flight(welded or bolted to a central shaft),a drive unit(motor and reducer),and inlet/outlet connections.The tube is typically made of carbon steel,stainless steel,or wear-resistant alloy,depending on the material being conveyed—stainless steel is commonly used for food,pharmaceutical,or corrosive materials to ensure hygiene and durability.

Its working principle is similar to other screw conveyors but optimized for closed operation.When the drive unit is activated,the motor drives the reducer to rotate the central shaft and the attached helical flight.As the flight rotates,it creates a forward thrust,pushing materials along the inner wall of the tube.The enclosed design eliminates material spillage and minimizes dust emission,while the smooth tube inner surface reduces friction,ensuring stable and efficient conveying.

Tube screw conveyors are widely used in industries that demand cleanliness,environmental protection,or material integrity,including food processing,pharmaceuticals,chemicals,plastics,and building materials.In food factories,they convey flour,sugar,and food additives without contamination;in chemical plants,they transport powdered chemicals safely without leakage;in construction,they move cement,fly ash,and other powdery materials to avoid dust pollution.

Key advantages of tube screw conveyors include excellent sealing performance,compact structure(saving installation space),flexible layout(can be horizontal,inclined,or vertical),and easy maintenance.They also prevent material degradation by reducing exposure to external factors such as moisture and dust.However,they require regular cleaning to avoid material buildup,especially when conveying sticky or hygroscopic materials.With continuous technological improvement,modern tube screw conveyors are increasingly equipped with variable speed drives for precise control of conveying capacity,adapting to diverse industrial needs.