Cable glands is also called cable head. After the cable is laid, in order to make it a continuous line, each segment of the line must be connected as a whole, and these connection points are called cable glands. The cable glands in the middle of the cable route is called the intermediate joint, while the cable joint at both ends of the route is called the terminal. The cable joint is used to lock and fix the incoming and outgoing lines, playing a role of waterproof, dust-proof and shock proof.