Gravity-adjustable pressure relief explosion door

The utility model discloses a gravity-adjustable pressure relief explosion-proof door, which belongs to the technical field of explosion-proof doors, can adapt to the pressure change in a flue gas duct, and can adjust the required gravity at any time so as to achieve the pressure relief effect, facilitate maintenance, find the pressure change and achieve the corresponding effect by rotating a balancing weight, so that the response is more relaxed. A cavity is formed in the shell, an opening is formed in one end of the shell, and a connecting base is arranged on the outer side face of the shell. The geometric center of the cover body is connected with the beam body, and the first end, away from the geometric center of the cover body, of the beam body is hinged to the connecting base; the second end, away from the geometric center of the cover body, of the beam body penetrates through the balancing weight, and the balancing weight can move in the axial direction of the beam body so as to change the gravity cent