Bearing wheel group of self-adaptive door machine

The utility model relates to a bearing wheel group of a self-adaptive door machine, comprising bending rails. Four groups of operating mechanisms are distributed on the bending rails; travelling wheels on outer rails in the operating mechanisms are larger than those of travelling wheels on inner rails; a balance beam is connected with an upper bearing seat by an upper hinge shaft; and two travelling platforms are respectively connected with two ends of the balance beam by a vertical shaft bearing mechanism. A vertical shaft in the vertical shaft bearing mechanism is matched with a sleeve and a thrust bearing. In the bearing wheel group, the service life of the travelling wheel can be prolonged, the wear of the rails is relieved, the impact of members of a transmission mechanism is relieved and the vibration and overturn of the door machine are avoided.