Abstract: A sealing device and underwater machinery equipment are provided. The sealing device includes a sealing plug and a fixing assembly, wherein the sealing plug is in fixed connection with multiple cables, and the fixing assembly is constructed to fix the sealing plug on a sealed cabin in an abutting manner, such that the sealing plug is occluded in the sealed cabin. The underwater machinery equipment includes the sealing device as described above.

Abstract: A waterproof sealing structure for a cable and a communication device are provided. The waterproof sealing structure includes: a cable inner core, a cable sheath, fastening structures, and an actuating mechanism, wherein the cable sheath is molded by one-time pouring outside the cable inner core, the cable sheath comprises an elongated sheath and disc-shaped sheaths, the disc-shaped sheaths are molded at end portions of the elongated sheath, the end portions of the cable inner core are connected to the actuating mechanism, ends of the actuating mechanism connected to the cable inner core are open, and the disc-shaped sheaths are sealed and fastened at the open ends of the actuating mechanism through the fastening structures.

Abstract: A watertight joint and a plug-in device are provided. The watertight joint includes a gland, a plug, an end cap and a sleeve cover, wherein the end cap includes a cable, a wrapping body and a sealing ring, wherein the wrapping body is wrapped on the cable and in a cone-shaped structure, and the sealing ring is sleeved over the second end of the wrapping body, the plug is fixedly connected to the port of the cable, the sleeve cover and the gland are sleeved over the wrapping body, opposite to each other, and the sleeve cover and the gland are in threaded connection, and the inner wall of sleeve cover abuts on the sealing ring.