A vacuum chamber is closed, the vacuum pump is working, the vacuum chamber starts to vacuum, the vacuum inside the packaging bag is at the same time, the pointer of the vacuum gauge rises, reaches the rated vacuum degree (controlled by the time relay ISJ), the vacuum pump stops working, and the vacuum stops. While working in the vacuum, the two-position three-way solenoid valve IDT works, heat-sealed the air chamber vacuum, and the hot-pressing frame remains in place.
IDT breaks, the outside atmosphere enters the heat-sealing air chamber through its upper air inlet hole, utilizes the pressure difference between the vacuum chamber and the heat-sealing air chamber, and the heat-sealing air chamber is inflated, so that the upper heat-pressing frame is moved downward and presses the bag At the same time, the time relay 2SJ works, after a few seconds, the heat seal ends.
The two-position two-way solenoid valve 2DT opens, the atmosphere enters the vacuum chamber, the vacuum gauge pointer returns to zero, the hot-pressing frame is reset by the return spring, and the vacuum chamber is opened.
Move the upper vacuum chamber to another vacuum chamber, that is, enter the next working process, and the left and right chambers work alternately and reciprocally.
Use and maintenance of vacuum packaging machine