The blowing-type automatic screw feeder achieves precise material conveying through the combined action of a rotating screw and compressed air. Adjusting its conveying speed and flow rate requires comprehensive adjustments across six dimensions: screw rotation speed, air source pressure, screw structural parameters, control system settings, material characteristic adaptation, and equipment maintenance. This ensures stable operation and meets production demands.
Screw rotation speed is the core factor affecting conveying speed and flow rate. Higher rotation speeds result in a larger volume of material pushed by the screw per unit time, thus increasing conveying speed and flow rate. Adjustment can be achieved by controlling the drive motor speed via a frequency converter, enabling stepless speed regulation. For example, when conveying lightweight materials,
increasing the rotation speed can quickly complete the conveying task; while when conveying fragile or sticky materials, the rotation speed must be reduced to avoid material breakage or blockage.
The stability of the air source pressure directly affects the blowing effect, thus impacting material conveying efficiency. Insufficient pressure prevents the compressed air from providing sufficient thrust, causing material to accumulate in the pipeline or reducing the conveying speed; excessive pressure may cause material splashing or vibration of the blowing-type automatic screw feeder. During adjustment, the air source pressure needs to be adjusted to a suitable range using a pressure reducing valve or booster pump, based on the material characteristics and conveying distance. For example, when conveying fine powdery materials, a lower pressure should be maintained to prevent dust generation; when conveying granular materials, the pressure can be appropriately increased to enhance conveying power.
The structural parameters of the screw, such as pitch, diameter, and blade shape, have a significant impact on conveying capacity. A larger pitch results in a larger volume of material pushed in a single rotation, but an excessively large pitch may lead to insufficient material filling, thus reducing conveying efficiency. The screw diameter directly affects the cross-sectional area of the conveying channel; a larger diameter allows for a greater amount of material to pass through per unit time. The blade shape (such as a solid spiral surface or a ribbon spiral surface) affects the contact area and friction between the material and the screw, thus affecting conveying stability. During adjustment, appropriate screw structural parameters should be selected based on the material characteristics and conveying requirements. For example, when conveying viscous materials, a ribbon spiral surface is preferable to reduce material adhesion; when conveying loose materials, a solid spiral surface can be used to improve conveying efficiency.
Modern blowing-type automatic screw feeders are mostly equipped with intelligent control systems, allowing users to set conveying parameters via touchscreen or host computer software. These systems typically include "speed adjustment" and "flow rate setting" modules. Users can input target values based on production needs, and the system automatically adjusts the screw rotation speed and air pressure for precise control. Some high-end equipment also supports integration with other equipment on the production line, dynamically adjusting conveying speed and flow rate according to downstream process requirements, achieving fully automated control.
Material characteristics (such as density, particle size, moisture content, and flowability) directly affect conveying efficiency. High-density materials require higher screw rotation speeds and air pressures for stable conveying; materials with uneven particle sizes may cause pipe blockage or conveying speed fluctuations; high-moisture materials tend to adhere to the screw or pipe walls, requiring regular cleaning; materials with poor flowability require optimized screw structure or the addition of auxiliary air blowing devices to improve conveying efficiency. Adjustments must be tailored to the material characteristics. For example, when conveying damp materials, an anti-stick coating can be applied to the screw surface or a heating device can be added to reduce material moisture.
Equipment maintenance is crucial for ensuring stable conveying speed and flow rate. Prolonged use can lead to decreased conveying efficiency due to issues such as screw wear, pipe blockage, or leaks in the air supply system. Regular inspection of the screw wear is necessary, with timely replacement of worn parts; cleaning residual material from the pipes to prevent blockages; and checking the air supply system's sealing to ensure stable pressure. Regular maintenance can extend the equipment's lifespan and maintain stable conveying performance.
