Anti-backfire device for oxygen and acetylene gas cylinder

The utility model belongs to the technical field of acetylene gas cylinder backfire prevention, and particularly discloses a backfire prevention device for oxygen and acetylene gas cylinders, which is characterized in that a base is positioned at the bottom of an acetylene gas cylinder, a plurality of lower connecting parts, a plurality of connecting rods, a plurality of upper connecting parts and a plurality of clamping plates are arranged, the two ends of the connecting rod are connected to the lower connecting part and the upper connecting part correspondingly to be hinged to the lower connecting part and the upper connecting part, the end, away from the connecting rod, of the upper connecting part is fixedly connected with the clamping plate, and the connecting rod is pulled to rotate with the lower connecting part as the axis, so that the clamping plate is attached to the outer side of the acetylene gas tank. Inclination or inversion is avoided, so that liquid acetylene is prevented from entering a gas p