Simple holding and sealing device for metal pipe

The utility model discloses a simple embracing and sealing device for metal pipes, which belongs to the technical field of vacuum sealing and comprises a non-standard shell, a piston sealing head and a cap, the piston sealing head is positioned in the non-standard shell and is in sealing fit with the non-standard shell for use, a first boss and a second boss are arranged on the lower surface of the cap, and the second boss is positioned in the non-standard shell. The bottom end of the cap extends into the non-standard shell, and the cap and the non-standard shell are detachably connected. The non-standard shell, the piston sealing head and the cap are used in cooperation with the isolation sealing ring and the enclasping sealing ring, the structure is simple, the number of the sealing rings is small, problems are not prone to occurring, the structure is stable in use and easy to machine, automatic enclasping and loosening can be achieved only by controlling inflation and deflation, the automation degree is hi