Device for preventing nut and R pin from falling off

The utility model discloses a device for preventing a nut and an R pin from falling off, which comprises a cylindrical insulating sleeve with one closed end, L-shaped clamping grooves communicated with the end face of the other end and an inner cavity are symmetrically arranged on the circumferential surface of the insulating sleeve, and the bending positions of the two L-shaped clamping grooves are opposite in direction. According to the device, the R pin is clamped in the L-shaped clamping groove through matched rotation of the L-shaped clamping groove, the top of the bolt clamped by the R pin is matched with the cylindrical groove, so that the R pin is clamped in the L-shaped clamping groove conveniently, it is guaranteed that the R pin is prevented from being blown by wind and rain, and the R pin is prevented from rusting and breaking; after the device is installed, the phenomenon that the nut and the bolt swing along with wind to be loosened in the using process can be prevented,and therefore it is guara