Tire replacement structure based on different diameters and livestock mobile weight measuring system and method

The invention discloses a tire replacement structure based on different diameters and a livestock moving weight measuring system and method.The tire replacement structure comprises a mounting wheel shaft, obstacle crossing wheel bodies, eccentric bearing seats and bearings, and the mounting wheel shaft is rotationally assembled on a limiting frame; the obstacle crossing wheel body is assembled on the mounting wheel shaft in a transmission manner; the eccentric bearing seat is fixedly connected to the limiting frame, and the eccentric bearing seat is provided with an eccentric hole; a bearing is assembled in the eccentric hole, and the mounting wheel shaft is assembled and connected with the bearing. The technical problems that in the prior art, when tires with different diameters are replaced for a rail robot, part of the structure of the robot needs to be changed, the working procedure is complex, the tires cannot be rapidly and stably replaced, the weighing operation efficiency is not high, and the normal o