This utility model discloses a wire harness sheath airtightness testing device, comprising: a testing box, a box cover on the top of the testing box, an
air pump fixedly connected to one end of the top of the box cover, a fixed structure at one end of the
air pump, a driving mechanism on one side of the testing box, a gas sensor fixedly connected to the inner side wall of the testing box, a
pressure sensor fixedly connected to the other inner side wall of the testing box, a
detector fixedly connected to one end of the outer side of the testing box, a
vacuum pump fixedly connected to the back of the testing box, and an extraction
pipe fixedly connected to the
vacuum pump's extraction port. During installation, the wire harness sheath is simply placed on the connecting
pipe. After inflation, the
gas pressure expands the sealing ring, automatically pressing the sheath into the groove to form a tight seal, eliminating the need for manual stretching. When
helium is filled, the sheath naturally straightens, ensuring uniform gas distribution and avoiding testing errors caused by traditional stretching. The
system is equipped with an electric push rod for one-button opening and closing of the box cover, and features a detachable bolt design for easy maintenance.