Locking device for achieving calibration of bending roller of hot rolling box

The utility model relates to a locking device for achieving calibration of bending rollers of a hot rolling box. The locking device is characterized in that a two-position cutoff valve is connected on a hydraulic pipeline between a rodless chamber and a proportional valve of a hydraulic cylinder and enables the rodless chamber to keep closed, the rodless chamber of the hydraulic cylinder is connected with the two-position cutoff valve through a ball valve, the other end of the two-position cutoff valve is connected with the proportional valve and an overflow valve respectively, and the other end of the overflow valve is communicated with an oil tank. The locking device is adopted to lock an inlet bending roller and then to prevent an outlet bending roller from being compressed by a bending roller intermediate guide plate, thereby achieving the purpose of independent compression and calibration of the inlet bending roller and the outlet bending roller and completely eliminating the need of manual measurement a