Driving device for mill fast roller changing big vehicle running

The utility model relates to a big vehicle walking fast roll-changing transmission device of a rolling mill, which is mainly composed of a walking motor (3), a driving wheel device (2), a roll-changing driven wheel device (1) on the tail part of a big vehicle, a driven wheel device (5) on the head part of the big vehicle, a roll-changing big vehicle base frame (4) an encoder (12) and a computer. The utility model is characterized in that two vehicle wheels (7) of the driven wheel device (5) on the head part of the big vehicle are connected with each other through a synchronization mechanism (6). When a roll-changing big vehicle walks, though only one of the two vehicle wheels (7) of the driven wheel device on the head part of the big vehicle, contacts with a track, wherein the vehicle wheel is provided with the encoder, the encoder can be ensured not to lose turns; therefore, the accurate positioning of the roll-changing big vehicle is realized.