The fully automatic vacuum inflation sealing machine is used to pack food into packaging bags, extract the air from the packaging bags, and complete the sealing process after reaching the predetermined vacuum degree. It can have the following functions: 1. Extract and seal the bag; 2. Seal the bag mouth directly. The operation process sequence of the fully automatic vacuum inflation sealing machine is as follows: 1. Vacuum: the vacuum chamber is closed, the vacuum pump is working, the vacuum chamber starts to evacuate, and the packaging bag is simultaneously evacuated. The vacuum gauge pointer rises to reach the rated vacuum degree (controlled by the time relay ISJ), and the vacuum pump stops working and the vacuum stops. At the same time as working in vacuum, the two position three-way solenoid valve IDT works, the heat sealed chamber is evacuated, and the hot press frame remains in place. 2. Heat sealing: IDT is broken, and the external atmosphere enters the heat sealing chamber through its upper inlet hole. Using the pressure difference between the vacuum chamber and the heat sealing chamber, the heat sealing chamber is inflated and expanded, causing the upper hot press frame to move down and press against the bag opening; Simultaneously heat seal the transformer and start sealing it; At the same time, the time relay 2SJ works and will activate after a few seconds, ending the heat sealing process. 3. Return air: Two position two-way solenoid valve 2DT is connected, and the atmosphere enters the vacuum chamber. The vacuum gauge pointer returns to zero, and the hot press frame is reset by the reset spring. The vacuum chamber cover is opened. 4. Cycle: Move the above vacuum chamber to another vacuum chamber, that is, enter the next working process. The left and right chambers work alternately, and repeat the cycle