Self-locking I-beam hoisting and positioning device with fine adjustment function

The utility model relates to a self-locking type I-beam hoisting and positioning device with a fine adjustment function, which comprises two lifting appliances and two positioning rods, each lifting appliance comprises two clamping plates, the upper ends of the two clamping plates are rotationally connected through a pin shaft, a bayonet is formed in the position, close to the lower end, of each clamping plate, the bayonets of the two clamping plates are opposite, a screw hole is formed in the middle of each clamping plate, and the two positioning rods are arranged in the screw hole. The screw holes of the two lifting appliances are oppositely arranged, the two positioning rods respectively penetrate into the opposite screw holes of the two lifting appliances, and the two ends of each positioning rod are respectively in threaded connection with an adjusting nut. The buckle type lifting appliance is used for lifting the I-shaped beam, so that the lifting efficiency and the safety are high; after the I-shaped b