Self-stabilizing and adjusting device of propulsion oil cylinder of shield machine

The invention discloses a self-stabilizing and adjusting device of propulsion oil cylinders of a shield machine. The device includes self-adjusting oil cylinders which are installed on the upper side and the lower side of each set of propulsion oil cylinders respectively; each self-adjusting oil cylinder includes a transversely arranged cylinder barrel and a piston cavity arranged in the cylinder barrel, the two ends of each piston cavity are symmetrically provided with two sets of piston heads and piston rods, and the outer end portions of the piston rods are provided with walking cams; springs are arranged between the corresponding two piston heads and in each piston cavity, and the two ends of each spring elastically make contact with the corresponding piston heads; the outer peripheral surfaces of the two propulsion oil cylinders are provided with annular slideways, the edge of one side of each walking cam is connected with the inside of the corresponding slideway in a clamping mode, the outer part of the