The wrist arm structure mainly includes the following parts:
The catenary wrist arm system includes a flat wrist arm, an oblique wrist arm, casing ears, a wrist arm support device, and a load-bearing cable. Seat, pipe cap, locator, locator windproof cable, locator support, electrical connection between locator and positioning support. The wrist arm is installed on the upper part of the pillar to support the contact suspension and transmit the load. It is generally made of round steel pipes, and is related to factors such as the structural height of the contact suspension, the side limits of the pillars, and the location of the pillars.