External port protection device

The embodiment of the utility model discloses an external port protection device which comprises a cover plate covering an external port of equipment and a fixing support, and the cover plate is hinged to the fixing support through a rotating shaft. A first hinge part is arranged on the side, close to the fixing support, of the cover plate, a second hinge part is arranged on the edge of the side, close to the cover plate, of the fixing support, and the rotating shaft penetrates through the first hinge part and the second hinge part to connect the cover plate with the fixing support. The rotating shaft comprises a limiting structure and a damping structure which are arranged in the axial direction, the limiting structure is fixed to one of the first hinge part and the second hinge part, the other one of the first hinge part and the second hinge part is connected with the damping structure, and the limiting structure comprises a damping hole correspondingly matched with the outer contour of the damping structure and a gap communicated with the damping hole; the cross section of the damping structure is in a long circle shape, and the damping structure comprises two oppositely-arranged arc-shaped sections and a straight section connecting the two arc-shaped sections. The damping structure is in interference fit with the damping hole, the damping structure can rotate relative to the damping hole, and when the damping structure rotates to be attached to the damping hole, the cover plate is in a closed state.