Flat tenon type lead screw anti-rotation structure for manual mechanism matched with pneumatic actuating mechanism

The invention relates to a flat tenon type lead screw anti-rotation structure for a manual mechanism matched with a pneumatic actuating mechanism, which comprises the pneumatic actuating mechanism, and the pneumatic actuating mechanism is provided with an upper film cover, a lower film cover, a push rod and a bracket; a hand wheel assembly is arranged between the lower diaphragm cover and the support and comprises a worm gear case cover, a worm gear, a worm gear case, an anti-rotation plate, a worm gear lead screw, a pin shaft, a worm and an operation handle. The side face of the thread is prevented from making contact with the anti-rotation plate, and friction resistance generated when the worm gear lead screw and the anti-rotation plate move relative to each other is reduced; the possibility that the worm gear lead screw and the anti-rotation plate are blocked when moving relative to each other is avoided; the abrasion degree of the worm gear lead screw on the anti-rotation plate after deflection in the cir