Inclined Tubular Screw Conveyor

What is an Inclined Tubular Screw Conveyor?

Inclined Tubular Screw Conveyor is a conveying device that uses rotating helical blades to continuously propel materials. Its core feature is that it can convey materials horizontally and also lift materials at an inclined angle. The main body of the equipment is a cylindrical, sealed casing made of seamless steel pipe, with a helical shaft running through it. A motor drives the helical shaft to rotate, moving the material axially. This enclosed tubular design provides excellent sealing performance, effectively preventing dust leakage. It is particularly suitable for conveying powdery, granular, or small lump materials such as cement, fertilizer, ash, sand, coal powder, and grain. Non-standard customization is supported, allowing for adjustments to the tilt angle and the shape and position of the inlet and outlet to suit specific production conditions.

Inlined Tubular Screw Conveyor Types

A comprehensive product line adapts to various material characteristics, including powdery, granular, viscous, and materials containing entanglements, ensuring the best conveying solution tailored to your specific needs. We offer a variety of screw conveyor types for your selection.

U-shaped Screw Conveyor: The casing is a U-shaped trough, open or covered at the top. Generally suitable for horizontal or slightly inclined conveying, typically not exceeding 10°-20°. It has a simple structure and facilitates multi-point loading and unloading. Its cost is relatively low, but its sealing performance is not as good as the tubular type.

Tubular Screw Conveyor: The casing is a fully enclosed seamless steel pipe. This is the mainstream form of inclined conveying, offering excellent sealing performance, preventing material leakage, and being environmentally friendly.

Shafted Screw Conveyor: The screw blades are fixed to the central shaft, resulting in high structural strength. Suitable for conveying powdery, granular, and other non-sticky, non-entanglement materials.

Shaftless Screw Conveyor: Without a central shaft, the screw blades directly contact the wear-resistant lining of the inner wall of the casing. This design reduces the risk of material entanglement or blockage, making it particularly suitable for conveying sticky or easily entangled materials.

What are the advantages of the Inclined Tubular Screw Conveyor?

The Inclined Tubular Screw Conveyor achieves dust-free and clean conveying with a fully enclosed tubular structure, effectively improving the working environment. It can be flexibly arranged horizontally or at large angles to adapt to various process layouts. It also supports multi-point loading and unloading and integrated process integration, making it an excellent choice for inclined conveying of bulk materials.

Good sealing: The fully enclosed tubular shell effectively prevents material dust from escaping, improving the working environment and preventing material contamination from external sources.

Flexible Layout: It can be arranged horizontally or at different incline angles to achieve multi-point feeding and unloading of materials, and even complete multiple processes such as conveying, mixing, and stirring on the same machine.

Simple Structure: The equipment has a compact structure and is easy to operate. Key components such as the hanger bearings are specially designed, sometimes allowing lubrication without removing the cover plate, resulting in high reliability and minimal maintenance.

Large Incline Conveying Angle Capacity: By increasing the rotation speed and utilizing the friction between the material and the casing to overcome gravity, it can achieve material lifting at large angles.

How does the Inclined Tubular Screw Conveyor work?

The Inclined Tubular Screw Conveyor works by having the motor drive the screw shaft to rotate within a sealed tube groove via a reducer. Material is added from the inlet. Due to its own weight and the friction between it and the tube wall, the material does not rotate with the screw blades. Instead, like a fixed nut, it moves forward along the spiral trajectory under the continuous thrust of the rotating spiral surface. When arranged at an incline, the material also needs to overcome gravity to rise. At this point, by increasing the screw speed, the material generates greater friction against the inner wall of the casing under centrifugal force. This friction is sufficient to prevent the material from sliding down and push it upwards, thus achieving inclined or vertical lifting.

Screw conveyor size chart

Inclined Tubular Screw Conveyor Application Scenarios

Inclined Tubular Screw Conveyors are widely used in building materials, chemical, food processing, metallurgy, and power industries for inclined lifting and conveying of powdery, granular, and viscous materials such as cement, fertilizer, grains, coal powder, and sludge. Its closed-loop tubular design meets the requirements of high-level feeding and batching processes, and can adapt to complex indoor and outdoor working conditions.

Building Materials Industry: Conveying cement, limestone powder, coal powder, sand, and gravel, commonly used in mixing plants and cement plants.

Chemical Industry: Used for conveying powdery and granular chemical raw materials such as fertilizers, soda ash, and pigments.

Food and Grain Industry: Conveying flour, grains, beans, etc., its airtight design ensures food safety.

Wastewater Treatment: Shaftless products are commonly used for conveying and lifting sticky or entangled materials such as screenings and sludge intercepted by bar screens.

Metallurgy and Power: Conveying materials such as pulverized coal and ash.

What is the maximum tilt angle of an Inclined Tubular Screw Conveyor?

Theoretically, the maximum tilt angle of an Inclined Tubular Screw Conveyor can reach 60°, but the actual safe tilt angle needs to be determined comprehensively based on material characteristics, conveying distance, and equipment parameters. The recommended tilt angle for standard models is generally no more than 15°, at which point conveying efficiency and operational stability are optimal. As the tilt angle increases, the downward trend of material gravity intensifies. To maintain conveying capacity, the screw speed and motor power need to be significantly increased, while the conveying length should be shortened accordingly; otherwise, it can easily lead to a sharp drop in efficiency or equipment overload. Different materials have significantly different adaptability to tilt angles: powdery materials have high fluidity, and excessive tilt angles can easily cause backflow; while sticky or lumpy materials can be lifted by greater friction, this may increase blade wear. When selecting a conveyor, we can provide detailed operating conditions, allowing the manufacturer to calculate the required parameters based on screw diameter, pitch, speed, and torque. This ensures that energy consumption and equipment lifespan are balanced while meeting lifting height requirements, avoiding the sacrifice of system reliability by blindly pursuing large inclination angles.

The Inclined Tubular Screw Conveyor, with its core advantages of being enclosed, flexible in layout, and capable of conveying large inclination angles, has become the ideal choice for conveying powder and granular materials in numerous industries.