Flap valve device for vacuum chamber

The utility model discloses a flap valve device for a vacuum chamber, which comprises a valve plate, more than one group of connecting devices are arranged on the valve plate, each connecting device comprises two connecting rods which are arranged in parallel, a connecting seat is arranged between the two connecting rods, and the connecting seats are movably connected with the connecting rods through shafts. Wherein the connecting seat is connected with the valve plate through a screw rod, the screw rod between the connecting seat and the valve plate is sleeved with a belleville spring, the connecting rods on the two sides of the connecting seat are respectively provided with an adjusting rod penetrating through the connecting rods and making contact with the valve plate, the connecting rods are fixed to a through shaft, and the two ends of the through shaft are respectively connected with couplers penetrating through the wall of the vacuum chamber. The coupler is connected with the vacuum chamber wall throug