Auxiliary positioning mechanism for span change of front supporting leg of split type bridge girder erection machine

The utility model discloses an auxiliary positioning mechanism for span change of a front supporting leg of a split type bridge girder erection machine, which is arranged at a connecting position of the front supporting leg of the bridge girder erection machine and a main beam of the bridge girder erection machine during side span operation and comprises an outer positioning unit and an inner positioning unit. The outer positioning unit is fixedly arranged below the outer wall of the main beam of the bridge girder erection machine and extends downwards to the outer side wall of the front supporting leg of the bridge girder erection machine; the inner positioning unit is fixedly arranged on the inner wall of the front supporting leg of the bridge erecting machine and extends upwards to the inner side wall of the main beam of the bridge erecting machine. According to the auxiliary positioning mechanism, the mounting position of the span-changing motor of the front supporting leg of the bridge girder erection ma