The working cycle of a vacuum feeder mainly consists of four stages:

Feeding Stage:
The feeding valve remains open, allowing material to fall freely into the feeding cylinder under gravity. There are two scenarios in this stage:

When material accumulates to a certain height and triggers the level sensor, the sensor sends a signal, and the feeding valve automatically closes, completing the feeding process.

If the feeding time is shorter than the designed time, the feeding valve sends a signal in advance. During this feeding process, material bridging should be avoided.

Fluidization Stage:
The inlet valve opens automatically. Compressed air enters the housing and continuously diffuses through the fluidization plate, ensuring that material particles are evenly surrounded by air. The pressure inside the fluidization plate increases to prevent material clogging. The key technical aspect of this stage is to ensure that material particles do not clog within the fluidization plate.

Conveying Stage:
The pressure inside the conveying sleeve continues to rise. When it reaches the set value, the pressure sensor sends a signal, and the discharge valve opens. As material is discharged from the fluidization plate, the material level inside the housing decreases, enhancing the fluidization of material within the fluidization plate. This keeps the entire conveying stage in both fluidization and conveying states simultaneously.

Purging Stage:
After the material particles are conveyed, when the pressure inside the sleeve drops to the empty pipe pressure, the pressure sensor sends a signal, prompting the purging pipeline to continue purging for a period. Then, the inlet valve closes. When the pressure inside the cylinder returns to atmospheric pressure, the ash discharge cycle outlet valve closes.

The vacuum feeder uses a vacuum pump to extract air, creating a vacuum at the suction nozzle inlet and throughout the system. Powdered and granular materials, along with external air, are drawn into the nozzle, forming a material-airflow mixture. This mixture travels through the suction pipe to the hopper, where the gas and material are separated.