Anti-drop bolt of overhead transmission line hardware

The invention relates to an anti-drop bolt of overhead transmission line hardware, and belongs to the technical field of power transmission. The anti-drop bolt comprises a bolt 1, 1-2 nuts 2, an anti-drop sleeve pipe 3, a closed pin 4 and a closed pin 13; the bolt 1 is provided with a thread 11, two grooves 5, a pin hole 6 and a pin hole 14 are reserved in the end part of the bolt 1, and the two grooves 5 are orthogonal to the pin hole 6 and the pin hole 14; the anti-drop sleeve pipe 3 is composed of a nut-shaped sleeve pipe 7, a circular sleeve pipe 8, a cylindrical hollow cover 9 and two protrusions 10; two insertion holes 12 of the closed pin 4 are reserved in the circular sleeve pipe 8, and the grooves 5 are matched with the protrusions 10; the nuts 2 sleeve the nut-shaped sleeve pipe7, and the rotation amplitude of the nuts 2 is limited through the protrusions 10; the closed pin 4 is inserted into the pin hole 6 and the insertion holes 12; the closed pin 13 is inserted into the pin hole 14; and the cylin