For a long time, in the production process of solid preparations in the pharmaceutical industry, the transportation of powder materials between the production links of PVC mixing system has become an important problem to improve the production process and product quality. In the solid preparation production enterprises in China, the production mode of manual batching and manual feeding is widespread. In this process, there are three times of contact between people and drugs. Materials can only be finally used in the next process after passing through three intermediate containers. The vacuum feeder not only increases the labor intensity of workers and complicates the process, but also increases the possibility of cross contamination of materials. At the same time, during the transportation process, it may cause a lot of dust, pollute the environment and affect the health of PVC mixing system operators. Some materials are also flammable, explosive, toxic, harmful and other special properties, so it is more unsuitable to use this method. This situation also exists in tablet pressing, capsule filling and other processes, and most domestic manufacturers are still using manual feeding. The ideal conveying mode of PVC mixing system should be to minimize the direct contact between people and materials, so that the materials can be transported in a closed environment. In this way, labor can be saved, costs can be reduced, cross contamination can be avoided, and the automation of the production process of solid preparations can be improved. Thus, a vacuum feeder has emerged.