In concrete production environments, material flow consistency and feeding accuracy are critical factors that directly affect batching quality. However, due to the physical characteristics of cement-based materials—such as fine particles, moisture sensitivity, and cohesiveness—proper screw conveyor selection and design become essential for stable operation.
Concrete is a cementitious material made by mixing cement, sand and gravel aggregates, water, and admixtures in a specific ratio. Its core characteristics are as follows:
Plasticity. Freshly mixed, it is a flowing paste that can be poured into any shape. Cement powder may absorb moisture and form lumps during storage or conveying, which can lead to feeding blockage.
Rapid Setting and Hardening. It hardens quickly at room temperature, losing its fluidity. This places requirements on the sealing of conveying equipment and the conveying speed. After hardening, it has high compressive strength, a dense structure, and is wear-resistant but brittle and prone to cracking upon impact.
Segregation. During transportation and conveying, aggregates tend to settle while the paste floats, affecting concrete quality. Therefore, a smooth and uniform conveying speed is essential.
Moisture Content Sensitivity:The amount of moisture directly affects fluidity and setting speed. Dryness must be controlled during powder conveying.
| Design Parameter | Specific Parameter |
|---|---|
| Screw Diameter | 168mm, 219mm, 273mm, 323mm |
| Screw Pitch | Standard pitch equals screw diameter |
| Rotation Speed | 20–60 rpm |
| Conveying Capacity | Related to diameter, pitch, speed and filling factor |
| Inclination Angle | Horizontal or ≤30° for optimal performance |
Concrete is easy to agglomerate - no central axis interference
During the concrete conveying process, a large number of agglomerations often occur frequently. When only the ordinary screw conveyor is used for transportation, the concrete is often condensed on the spiral blades, causing a large amount of concrete to clog inside the machine, which not only affects the concrete transportation efficiency, In the long run, the machine will be damaged, so the problem can be solved perfectly by using a shaftless screw conveyor.
The shaftless screw conveyor adopts the non-central shaft design, so the difficulty of conveying the concrete by the screw shaft is eliminated, which can effectively reduce the risk of material blockage and improve the transportation efficiency.
The concrete transport volume is large - the single machine transport length can reach 60 meters
Most of the concrete used for building materials requires a large amount of production, so the user is still transporting it when selecting the conveyor equipment.
The shaftless screw conveyor produced by Dahanhan factory can transport up to 60 meters in length, and can be installed in multiple stages according to the needs of users. It can transport materials over long distances. The conveying capacity is the same diameter of traditional shaft screw conveyor. 1.5 times.
Environmental performance - fully enclosed mechanism, low speed operation
As the country attaches great importance to environmental control, more and more construction industry is becoming more and more environmentally aware of the concrete transportation environment. How to improve the concrete transportation environment? It has become a concern for many users in the concrete industry.
Dahan shaftless screw conveyor adopts fully enclosed conveying and easy-to-clean spiral surface, which will not spread out during conveying process, which can ensure environmental sanitation and materials to be free from pollution and leakage, plus its lower adoption. Speed operation reduces energy consumption.
In addition to the above, Xinxiang Dahan's shaftless screw conveyor can be horizontally inclined and vertically transported. It can also be loaded and unloaded in the middle of the screw conveyor. The conveying direction can be reversed or transported in the opposite direction. The materials are mixed, mixed, heated and cooled. The material flow can be adjusted through the loading and unloading gates. The operation is very convenient and efficient. Users are welcome to come to consult at any time.
Tips: The conveying distance of the shaftless screw conveyor should not be too long. If the conveying distance is too long, the inclination should not be too high, preferably not more than 15°.
For more information on screw conveyors, you can consult Xinxiang Dahan.
During operation in concrete mixing plants, common problems include blockages caused by excessive moisture content, improper speed selection, and overfilling of the hopper; uneven feeding due to unreasonable screw pitch design and unstable motor speed control; and wear of the screw blades due to long-term friction with cement particles.
To improve the reliability of concrete mixing systems, several optimization methods can be used to improve conveying efficiency. These include: adopting a sealed tubular structure to reduce dust leakage and isolate external moisture interference; equipping with a frequency converter to precisely adjust the feeding speed as needed; implementing anti-clogging design through optimized screw pitch transition, smoothing the inner tube, and improving the feed hopper; and using hardened steel or adding a wear-resistant coating to effectively reduce wear and extend equipment lifespan.
Screw conveyors play an important role in concrete batching systems by providing stable and enclosed powder material transportation. By optimizing parameters such as screw diameter, pitch, speed, and conveying angle, batching plant operators can significantly improve system efficiency and reliability.
Address:China,Yanjin county forest park gate to the west 1000 meters north road.
Online Chat 
Email