What is the function of the vacuum tank in the feeding machine of many larger dosing devices that require a feeding machine?

Take powdered activated carbon as an example, its system configuration includes a feeding system, a storage system, a powder conveying system, a blending system, a liquid feeding system, and a control system. The main function of the feeding system is to transfer activated carbon from the warehouse or tanker to the storage bin in the system, which requires the use of a feeding machine.

The feeding section consists of a feeding station, a feeding fan, and a vacuum tank. The upper part of the vacuum tank is connected to the feeding fan for vacuuming, and the lower part of the vacuum tank is connected to the feeding station's hose for feeding. The feeding fan extracts negative pressure from the feeding station, and after feeding to the vacuum tank, the air is removed through the filter element, leaving activated carbon behind. After the vacuum tank is full, the feeding valve is opened to feed into the material bin. The feeding and follow-up are controlled by time.