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Bulk Material Screw Conveyor is a conveying device that uses rotating helical blades to propel materials continuously along a fixed trough or pipe. It can convey powdery, granular, and small lump bulk materials.
Pipe diameter: 89mm-800mm
Angle: Horizontal, inclined, vertical
Length: 30 meters horizontally; supports multiple units connected in series
Material: Carbon steel, plastic, 304 stainless steel, 316 stainless steel
Applicable materials: Cement, coal powder, grain, fertilizer, sand, gravel, etc.; allows for multi-point loading and multi-point unloading.
Bulk Material Screw Conveyor is a conveying device that uses rotating helical blades to continuously move materials along a fixed trough or pipeline. It can convey powdery, granular, and small lump materials, such as cement, coal powder, grain, fertilizer, and sand. It allows for multi-point loading and unloading, and can simultaneously perform material mixing, blending, and cooling processes during conveying. The horizontal length of a single unit can reach 30 meters, and it is available in carbon steel and stainless steel, supporting non-standard customization. It can be customized to meet specific site conditions for multi-point feeding.
The core advantages of a Bulk Material Screw Conveyor lie in its compact structure, excellent sealing, and flexible layout. Its sealed conveying method effectively prevents dust leakage, improves the working environment, and reduces material waste. The equipment can be arranged horizontally, inclined, or vertically, and can achieve multi-point feeding and unloading, making it highly adaptable to various processes. Furthermore, it boasts relatively low manufacturing costs, reliable operation, easy maintenance, and multi-functionality.
The working principle of a Bulk Material Screw Conveyor is based on the pushing action of rotating helical blades. When material enters the casing through the feed inlet, the rotating helical blades apply a normal thrust to the material, and its axial component propels the material forward along the conveying direction. The helical shaft is typically made of seamless steel pipe, with bearings at both ends to withstand radial and axial loads. For longer conveyors, additional hanger bearings are required in the middle to prevent excessive sag of the helical shaft.
| Material Category | Typical Materials | Bulk Density (t/m³) | Temperature Limit | Particle Size | Conveyability Rating |
| Powders | Cement, fly ash, lime, gypsum powder, flour | 0.8–1.5 | ≤200°C | Powder<0.1mm | Dry powders have good flowability, but overly aerated/fluffed powders may exhibit poor conveyability. |
| Granules | Grains, feed pellets, plastic granules, fertilizers | 0.6–1.3 | ≤80°C | Granular0.1–10mm | Free-flowing, mildly abrasive powders and fine granular materials; fill factor up to 0.45. |
| Small Lumps | Coal, coke, ore, gravel, slag | 1.2–2.5 | ≤200°C | <50mm | Moderate flowability and abrasiveness; fill factor 0.33 |
| Moist / Sticky Materials | Wet sand, sludge, pulp, wet clay | 0.8–1.8/td> | ≤80°C | Unrestricted | High moisture or sticky materials tend to adhere to the screw; shaftless screw conveyor is recommended. Wet clay rated good |
| Abrasive Materials | Slag, river sand, mineral slag, crushed glass | 1.5–2.8 | ≤200°C | Small lumps | Highly abrasive materials require a fill factor as low as 0.15; wear-resistant materials and increased flight thickness are needed. |
| Light / Specialty Materials | Sawdust, biomass, carbon black, barite powder | 0.2–1.0 | ≤80°C | <50mm | Light materials tend to generate dust; enhanced sealing is required. Barite powder and sawdust rated "Fair" |
We offer different types of screw conveyors to meet various customer needs and application scenarios. Customers can choose the appropriate powder screw conveyor based on their specific conveying requirements.
U-shaped Screw Conveyor: The casing has a U-shaped trough structure, and a top cover can be added for easy observation and maintenance. Suitable for horizontal or slightly inclined conveying, it is a common type.
Tubular Screw Conveyor: Features a cylindrical casing with excellent sealing, preventing dust leakage. Suitable for applications with high environmental requirements or for inclined conveying.
Shaftless Screw Conveyor: Employs integral helical blades without a central shaft, driven by the ends. Suitable for conveying highly viscous and easily entangled materials, minimizing clogging.
Inclined Screw Conveyor: Can operate at large inclination angles, directly connecting upstream and downstream equipment, saving space.
Vertical Screw Conveyor: Used for vertical material lifting, with high rotational speeds, utilizing centrifugal force and friction to overcome gravity. Conveying height generally does not exceed 6 meters, suitable for free-flowing powders and granules.
Flexible Screw Conveyor: The helical shaft is flexible, allowing for spatial curved conveying lines, avoiding material transfer, suitable for complex path conveying.
| LS type | 100 | 160 | 200 | 250 | 315 | 400 | 500 | 630 | 800 | 1000 | 1250 |
| GX type | 200 | 250 | 300 | 400 | 500 | ||||||
| Spiral diameter (mm) | 100 | 160 | 200 | 250 | 315 | 400 | 500 | 630 | 800 | 1000 | 1250 |
| Pitch (mm) | 100 | 160 | 200 | 250 | 315 | 355 | 400 | 450 | 500 | 560 | 630 |
| Speed (r/min) | 140 | 120 | 90 | 90 | 75 | 75 | 60 | 60 | 45 | 35 | 30 |
| Delivery capacity QΦ=0.33 (m³/h) | 2.2 | 7.6 | 11 | 22 | 36.4 | 66.1 | 93.1 | 160 | 223 | 304 | 458 |
| 功率Pd 1=10m（KW） | 1.1 | 1.5 | 2.2 | 2.4 | 3.2 | 5.1 | 4.1 | 8.6 | 12 | 16 | 24.4 |
| Power Pd 1=30m (KW) | 1.6 | 2.8 | 3.2 | 5.3 | 8.4 | 11 | 15.3 | 25.9 | 36 | 48 | 73.3 |
| Speed (r/min) | 120 | 90 | 75 | 75 | 60 | 60 | 45 | 45 | 35 | 30 | 20 |
| Delivery capacity QΦ=0.33 (m³/h) | 1.9 | 5.7 | 18 | 18 | 29.1 | 52.9 | 69.8 | 125 | 174 | 261 | 305 |
| Power Pd 1=10m (KW) | 1.0 | 1.3 | 2.1 | 2.1 | 2.9 | 4.1 | 4.7 | 6.8 | 9.4 | 14.1 | 16.5 |
| Power Pd 1=30m (KW) | 1.5 | 2.3 | 4.5 | 4.5 | 7 | 8.9 | 11.6 | 20.4 | 28.3 | 42.2 | 49.5 |
| Speed (r/min) | 90 | 75 | 60 | 60 | 45 | 45 | 35 | 35 | 30 | 20 | 16 |
| Delivery capacity QΦ=0.33 (m³/h) | 1.4 | 4.8 | 15 | 15 | 21.8 | 39.6 | 54.3 | 97 | 149 | 174 | 244 |
| Power Pd 1=10m (KW) | 0.9 | 1.2 | 1.9 | 1.9 | 2.5 | 3.4 | 4.3 | 5.4 | 8.1 | 9.5 | 13.3 |
| Power Pd 1=30m (KW) | 1.2 | 2.2 | 3.8 | 3.8 | 5.4 | 6.8 | 9.2 | 16 | 24.4 | 28.6 | 39.9 |
| Speed (r/min) | 75 | 60 | 45 | 45 | 35 | 35 | 30 | 30 | 20 | 16 | 13 |
| Delivery capacity QΦ=0.33 (m³/h) | 1.2 | 3.8 | 11 | 11 | 17 | 31.7 | 46.5 | 73.0 | 99.3 | 139 | 199 |
| Power Pd 1=10m (KW) | 0.75 | 1.1 | 1.6 | 1.6 | 2.1 | 3.1 | 3.7 | 4.6 | 5.7 | 7.7 | 11 |
| Power Pd 1=30m (KW) | 1.1 | 1.8 | 3.4 | 3.4 | 4.4 | 5.6 | 8 | 14 | 16.7 | 23.2 | 33 |
Bulk Material Screw Conveyor, with its excellent sealing, flexible layout, and adaptability to various materials, is widely used as a core conveying device in many industrial fields.
Building Materials Industry: One of the largest users of screw conveyors, used for unloading powders from silos and feeding materials into batching plants.
Chemical Industry: Commonly used for conveying chemical raw materials such as fertilizers, soda ash, carbon black, plastic granules, and resin powders. Due to the corrosive or flammable and explosive properties of chemical materials, this industry places particular emphasis on the sealing and corrosion resistance of equipment, often requiring customized stainless steel materials or explosion-proof configurations.
Food Industry: Screw conveyors are used to transport materials such as grains, beans, flour, feed, and sugar. Because grain conveying has high requirements for hygiene and breakage rate, this industry often uses tubular screw conveyors, constructed of stainless steel.
Metallurgical Industry: Often faces the challenge of conveying high-temperature, highly abrasive materials, such as iron concentrate, coal powder, coke, limestone, and slag. Screw conveyors in such conditions require wear-resistant materials, thicker blades, and cooling jackets to withstand high-temperature environments.
Power Industry: Essential equipment for processing materials such as fly ash, desulfurization gypsum, sludge, and landfill leachate. Shaftless screw conveyors, in particular, are widely used in wastewater treatment plants and waste treatment stations for conveying grit and dewatered sludge due to their resistance to tangling and excellent throughput.
Choosing the right bulk material screw conveyor is not just about price and specifications, but a systematic decision-making process that requires comprehensive consideration of material characteristics, process requirements, installation environment, and operating costs.
Determine Material Characteristics: Identify whether the material is powdery, granular, or in small lumps; whether it is sticky or prone to tangling; whether it is abrasive, corrosive, or flammable and explosive; and its temperature and moisture content.
Determine Conveying Requirements: Based on the production line layout, determine the horizontal conveying distance, lifting height, and required conveying capacity. It is also necessary to clarify whether quantitative feeding or simple conveying is required; the latter requires a variable frequency speed control system.
Consider the Installation Environment: External conditions such as the size of the installation space, whether it is indoors or outdoors, the explosion-proof zone rating, and dust emission standards also influence the selection. In workshops with explosion-proof requirements, motors and electrical components must be explosion-proof rated products.
To meet the diverse needs of different industries and operating conditions, our Bulk Material Screw Conveyor offers comprehensive and flexible component customization services, ensuring seamless integration with your production line.
Customized Length and Diameter: We can design the total length of the conveyor based on your site space and conveying distance, and provide various pipe diameters from 89mm to 800mm to match different conveying capacity requirements.
Customized Power System: In dusty or explosive gas environments, we can configure standard explosion-proof motors to ensure safe and reliable equipment operation.
Customized Inlet and Outlet: Depending on the process requirements, we can flexibly install multiple inlets and outlets at any location on the screw casing to achieve one-point feeding and multiple-point unloading, or multiple-point feeding and centralized discharge.
Customized Auxiliary Devices: For applications requiring the conveying of high-temperature materials or heat exchange during transport, we can add cooling or heating jackets to the outside of the casing, allowing for temperature-controlled conveying by introducing cooling water or steam. Furthermore, we support the addition of casters, making the equipment a flexible, mobile conveying unit suitable for locations such as grain silos and docks requiring multi-point operations.
We provide customers with high-quality, highly reliable bulk material screw conveyor solutions. The equipment uses high-quality seamless steel pipes as the casing, ensuring excellent overall rigidity and strong load-bearing capacity. The screw blades are manufactured using a one-piece molding process, resulting in precise pitch, high dynamic balance, and smooth operation. We offer a variety of models, from U-shaped and tubular to shaftless and vertical, as well as comprehensive customization options. Whether it's conveying length, pipe diameter, explosion-proof requirements, or frequency conversion control, we can tailor solutions to your specific needs, ensuring a perfect match for your process requirements. With years of industry experience and a deep understanding of bulk material conveying technology, we can provide you with professional selection advice and comprehensive after-sales service.
Can it convey high-temperature materials?
Yes, but customization is required based on temperature. Standard models have a temperature resistance of ≤100℃. With heat-resistant steel blades and high-temperature bearings, it can convey materials up to 200-500℃.
Can it convey damp materials?
Yes, but there are limitations on moisture content. Damp materials with good flowability and a moisture content ≤20% can be conveyed normally. For highly viscous materials with high moisture content, a shaftless screw conveyor is recommended, as it is less prone to clogging and has better throughput.
What is the delivery time?
Standard specifications typically take 15-20 working days. For special customizations, the lead time is approximately 25-35 working days. The specific time depends on the complexity of the order and the current production schedule.
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