A pneumatic vacuum feeder uses compressed air to generate a high vacuum through a vacuum generator, enabling material conveying without the need for a mechanical vacuum pump. It offers advantages such as a simple structure, compact size, maintenance-free operation, low noise, convenient control, elimination of material static electricity, and compliance with GMP requirements. The high vacuum generated by the vacuum generator prevents material stratification, ensuring the uniformity of mixed material components. It is an ideal feeding device for machinery such as tablet presses, capsule fillers, dry granulators, packaging machines, crushers, and vibrating screens.

When compressed air is supplied to the vacuum generator, it creates negative pressure, forming a vacuum airflow. Material is drawn into the suction nozzle, forming a material-airflow mixture that travels through the suction pipe to the feeder’s hopper. The filter completely separates the material from the air. When the hopper is full, the controller automatically cuts off the air supply, stopping the vacuum generator. Simultaneously, the hopper door opens automatically, allowing the material to fall into the equipment’s hopper. At the same time, compressed air automatically cleans the filter via a pulse reverse blow valve. When the set time elapses or the level sensor sends a feeding signal, the feeder automatically restarts. The machine uses high-pressure air for reverse blowing, instantly dislodging powder to maintain optimal performance. It is easy to clean, has no mechanical dead corners, allows quick material changes, features a simple structure, occupies minimal space, and is easy to move.

When a pneumatic vacuum feeder malfunctions, follow these troubleshooting steps:

If the feeder fails to convey material or has reduced conveying capacity, check the following:

Verify the system’s air supply pressure: Ensure it reaches 0.5–0.6 MPa. This refers to the air pressure in the system when the vacuum generator is operating.

Check the discharge door for tight sealing:

After prolonged use, powder may accumulate on the discharge door, preventing it from closing tightly and causing vacuum leakage. Clean the discharge door.

If the sealing ring of the discharge door is worn, replace it to ensure a tight seal.

If the pneumatic cylinder’s output or travel is faulty, replace the cylinder.

Inspect the filter for clogging:

Use compressed air to blow clean the filter.

Attempt to blow through the filter manually (reverse blowing). If air flows freely, the filter is not clogged. If resistance is felt, the filter is blocked.

Replace the clogged filter or clean it in an ultrasonic cleaner for 30 minutes or more.

Check for blockages in the suction pipe:

Blockages often occur at the inlet of the stainless steel suction nozzle or the entrance of the vacuum hopper.

Ensure all clamps are tightened:

Loose clamps between the pump head and hopper or between hopper sections can cause air leaks, reducing or preventing material conveyance.

Verify the reverse blow system:

During each discharge cycle, compressed air stored in the air reservoir pulse-reverse blows the filter to keep only a thin layer of powder on its surface.

If the reverse blow system malfunctions, excessive powder buildup on the filter increases resistance, preventing material conveyance. In this case, replace the reverse blow valve.

By systematically checking these components, you can identify and resolve common issues, ensuring the efficient operation of your pneumatic vacuum feeder.