Double acting type follow-up mechanism

The utility model discloses a double acting type follow-up mechanism and relates to a lifting follow-up structure of a tail board bearing platform. One end of a lifting arm is articulated with a main support, and the other end of the lifting arm is articulated with the upper part of the left end of the bearing platform. The double acting type follow-up mechanism is characterized in that a fan-shaped block is welded on a shaft sleeved at one end of the lifting arm, which is articulated with the main support, and a landing wheel is arranged at the bending part of the lifting arm; the middle part of the main support is articulated with the middle part of a waist-shaped bracket; a limit bolt is arranged at the lower part of the main support to support against the lower part of the waist-shaped bracket; a leaning wheel is arranged at the upper part of the waist-shaped bracket; the bottom of a lifting cylinder is articulated with the lower part of the waist-shaped bracket, and a piston rod is articulated with the m