Guard ring and installation method thereof

A guard ring is C-shaped. Two ends, at the opening positions, of the guard ring are each provided with a mounting block used for connecting an aircraft structural part; the wall thickness and axial height of the guard ring are both 5 mm, and according to the shape and size of an inner ring, an aircraft cable can be wrapped; and a small clearance is formed between the cable and the inner wall of the guard ring. During replacement of a cable component, the guard ring is removed, and the cable component to be replaced and a replaced cable component are connected through a thread sleeve as guide traction. Then, the cable component to be replaced is removed. The replaced cable component is connected with a system circuit. The guard ring is simple in structure and convenient in operation, and the maintenance efficiency is improved greatly; and the maintenance can be finished by single person, and the maintenance efficiency is improved. 一种防护圈，其外形呈"C"形。在该防护圈开口处两个端头上分别有用于连接飞机结构件的安装块；该防护圈的壁厚和轴向的高度均为5mm，内圈的形状和尺寸均能包裹飞机钢索