The star-type unloader-also known as a rotary feeder, airlock valve, or rotary airlock-is specialized discharge equipment designed for pneumatic conveying systems. Its primary function is to perform the dual tasks of continuously conveying materials and maintaining an airtight seal to isolate air pressure. Its core structure comprises a rotor impeller, housing, speed reducer, sealing components, and an electric motor. Through the rotation of the impeller, the device achieves the quantitative discharge of materials while simultaneously preventing air ingress into negative-pressure systems, thereby averting pressure imbalances.
This equipment is categorized into standard, pressure-resistant, and high-temperature models. Notably, the high-temperature model is capable of handling materials reaching temperatures of up to 500°C and features a sprocket-driven connection and an isolated bearing design. Widely utilized across industries such as environmental protection, metallurgy, chemicals, and grain processing, it is ideally suited for ash discharge in dust removal systems or for material discharge from storage hoppers involving dust and small granular materials. Key features include a compact structure, smooth operation, and superior sealing performance; the design-which separates the bearings from the housing-enables adaptability to high-temperature environments, while customizable configurations are available to meet the specific requirements of diverse operating conditions.
The star-type unloader is typically installed at the discharge outlet of equipment operating under negative pressure. It receives materials discharged from the upstream unit and, utilizing its rotating impeller, serves the dual purpose of conveying the material and maintaining an airtight seal. This sealing function prevents air from being drawn in through the discharge outlet during the pneumatic conveying process, thereby ensuring the unloader's proper and consistent discharge operation. As a specialized piece of discharge equipment, it plays a pivotal role in industrial cleaning and material handling applications. Consequently, it is essential to summarize its key characteristics to facilitate a comprehensive understanding of the star-type unloader-enabling effective maintenance and ensuring the device operates at its maximum potential.
