Shear blade gap adjusting mechanism of swing type shearing machine

Provided is a shear blade gap adjusting mechanism of a swing type shearing machine. The mechanism includes a lower knife rest, a base, a swing arm, an upper shear blade and a lower shear blade that are connected to each other, and the mechanism is characterized in that the lower shear blade is arranged on the lower knife rest; the upper shear blade is arranged on the swing arm driven by a hydraulic cylinder; the lower knife rest is connected to the base via the two pin shafts at the two ends; a lining is arranged between the external side of the pin shafts and the installing hole in the base; the pin shafts are fixed to the lower knife rest via the baffle plates at the shaft ends; the two ends of the connection part of the lower knife rest and the base are respectively provided with a connecting rod, the two ends of each connecting rod are provided with threads, one end of each connecting rod is fixedly connected to the lower knife rest and the base, the other end of each connecting rod is provided with a baf