Hinge assembly for preventing surface cover from falling and explosion-proof lamp

The utility model discloses a hinge assembly for preventing a surface cover from falling, which is used for being connected to a lamp body and a surface cover of the explosion-proof lamp. The hinge assembly comprises a rotating shaft, a movable hinge fixed to the surface cover, and a fixed hinge fixed to the lamp body. The fixed hinge is integrally connected to two guide grooves opposed to each other, and the guide groove is vertically arranged. The movable hinge is provided with a spindle sleeve which is disposed between two guide grooves and is smaller or equal to the distance between the two guide grooves in length. The rotating shaft traverses through the guide groove at one side, the spindle sleeve and the guide groove at the other side in order. The rotating shaft is connected to the guide groove in a manner of sliding up and down. The movable hinge is rotatably connected to the rotating shaft. The utility model also discloses an explosion-proof lamp using the hinge assembly. The hinge assembly for prev