Positive-pressure Screw Conveyor
Positive-pressure Screw Conveyor

Positive-pressure Screw Conveyor

The positive-pressure screw conveyor—often referred to as a positive-pressure sealed screw pump or a screw-type pneumatic feeder—is a sealed conveying system that integrates screw feeding with positive-pressure pneumatic transport. Unlike conventional open screw conveyors, this unit features a pressure chamber at the discharge end; the screw mechanism compresses the material to form a seal that prevents high-pressure gas backflow, while downstream compressed air conveys the material through a pipeline to the designated location. As a hybrid mechanical-pneumatic conveying system, it is widely used for the sealed feeding of powders and fine granular materials.
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Product Features

Integrated gas-sealing material plug: Eliminates the need for an additional airlock valve; the screw compresses the material to form a sealing layer that prevents high-pressure gas backflow-a key distinction from standard screw conveyors;
Fully enclosed conveying: The entire unit is sealed, preventing dust leakage;
Continuous conveying: Unlike dense-phase pneumatic pumps that operate intermittently;
Quantitative feeding: Conveying rate is controlled by adjusting the screw speed via a variable frequency drive (VFD);
Flexible pipeline layout: Capable of navigating inclines and turns;
Sensitive to material moisture content: Wet, sticky materials are prone to causing pipeline blockages;

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 Product Image

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Working principle

 

Material drops from the upper hopper into the screw feed chamber, where rotating screw flights push it forward;
The screw continuously compresses the material, forming a dense material seal at the discharge section that prevents high-pressure gas from backflowing into the hopper (acting as an air lock);
The screw pushes the material into the positive-pressure conveying chamber, where compressed air is introduced; the material is entrained by the airflow and conveyed under positive pressure through the pipeline to the discharge point;
A separator at the discharge end separates the material from the gas, allowing the gas to vent while the material is discharged.
In summary: The screw creates a material seal to lock the air, while compressed air conveys the material under positive pressure.

 

Enables multi-point discharge and branched conveying from a single main line
 

 

 

Features variable-frequency speed control with adjustable throughput to accommodate process fluctuations

 

 

Utilizes a simple pipeline layout and requires less maintenance than conventional long-distance screw conveyors

Product Advantages

 

Application field
 
 
 

 

Building materials industry: Conveying of cement raw meal, fly ash, limestone
 

 
 

 

Metallurgical industry: Conveying of mineral powder and metallurgical auxiliary powders;

 
 

 

Chemical industry: Conveying of various chemical powders, carbon black, pigments, and resin powders;

 
 

 

powder, and gypsum powder;
Power industry: Conveying of power plant fly ash and desulfurization limestone powder;

 
FAQ

Q: Do you have different models for selection?

A: Yes, we have multiple models with different capacity, power and size. Please tell me your working requirements, we will recommend the suitable model for you.

 

Q: What's your minimum order quantity?

A: MOQ is 1 set, we support single machine order and whole production line solution.

 

Q: What is your production lead time?

A: Normal delivery time: 15–30 working days after receiving your deposit

 

Q: Can you design the whole production line for us?

A: Sure. Please send your requirements: raw material, required output, factory area, target finished product. We will draw layout plan and offer full line solution.

 

 

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