Sealing device and multifunctional vacuum sealing machine applying same

A multifunctional vacuum sealing machine, comprising a shell, a sealing device, and a vacuumizing device, wherein the sealing device comprises a hot welding device, and a pressing plate, wherein the pressing plate is arranged above the hot welding device, and the pressing plate is capable of being moved to contact the hot welding device for press welding, wherein the hot welding device further comprises a heating wire;

• wherein the sealing device is arranged in the shell, wherein the shell is provided with an opening for a bag to be inserted, wherein the vacuumizing device further comprises a lower cavity body arranged in the shell and an upper cavity body, the upper cavity body is movably arranged above the lower cavity body, wherein when the upper cavity body is moved in the opening and in contact with the lower cavity body, a sealed cavity is formed between the upper cavity body and the lower cavity body, wherein the sealed cavity is connected with a vacuum pump, wherein the heating wire is located in the lower cavity body, wherein the pressing plate is arranged in the upper cavity body, wherein the pressing plate is movably connected with the upper cavity body, wherein a pressing surface of the pressing plate is lower than a bottom surface of the upper cavity body;
• and wherein the shell is internally provided with an upper cavity body reset spring for separating the pressing plate from the heating wire, wherein the upper cavity body is internally and fixedly provided with a needle, and the needle is arranged above an area surrounded by the heating wire, wherein the shell further comprises an upper cover and a lower cover matched with the upper cover, wherein a wall of the lower cavity body is internally provided with a first air pumping hole communicated with the lower cavity body, wherein the lower cover is provided with an air pumping connection hole hermetically communicated with the first air pumping hole, and wherein the air pumping connection hole is connected with the vacuum pump;
• wherein the lower cavity body is detachably connected with the lower cover, wherein the lower cavity body is capable of being manually rotated by 180 degrees to be connected with the lower cover, wherein a bottom portion of the lower cover is provided with an air pumping connector arranged below the first cavity, wherein the wall of the lower cavity body is internally provided with a second air pumping hole communicated with the air pumping connector, the first air pumping hole and the second air pumping hole are bilaterally symmetrically arranged in the wall of the lower cavity body, and wherein when the lower cavity body rotates by 180 degrees, the second air pumping hole is hermetically communicated with the air pumping connection hole.