Two-roll tandem pipe mill and roll framework locking device thereof

The invention discloses a two-roll tandem pipe mill and a roll framework locking device thereof. The roll framework locking device comprises a pressing device and a side locking device. Rolls of the roll framework include a first roll and a second roll parallel to each other. After the roll framework is mounted into a main base, the side locking device is used for longitudinally locking the rolls of the roll framework, and the pressing device is used for pressing from the first roll to the second roll of the roll framework. The side locking device comprises a locking cylinder and a pressure-bearing backing plate, wherein the locking cylinder is arranged at the back end of the main base, and an extending end of the locking cylinder is a locking press head, a first bevel is formed on the locking press head, and a second bevel matched with the first bevel to lock the rolls longitudinally is formed on the pressure-bearing backing plate arranged at the back end of the roll framework. By the roll framework locking device, the problem of keeping horizontal rolling balance of the roll framework of the two-roll tandem pipe mill in the prior art is solved, stability of the roll framework in rolling is guaranteed effectively, and steel pipe rolling quality is improved further.