The invention belongs to the field of steel rolling, and relates to a hot straightening
machine. The hot straightening
machine comprises a memorial archway, a pressing-down roll-bending device, a balancing device, a pressing-down AGC cylinder, an upper roll box, a lower roll box, an upper roll box clamping device, a lower roll box clamping deice, a shaft connecting bracket, a transmission device and a roll changing device; and a needle bearing, or a cylindrical
roller bearing or a sliding bearing mechanism is adopted by a transmission side of a working roll
system. According to the hot straightening
machine, the situation that a straightening plate cannot meet the product quality requirements due to the too large roll
diameter, or a straightening roller / a
universal joint is prone to beingdamaged to affect production due to the too small roll
diameter is broken through; and the current situations that the roll
diameter of the hot straightening machine is too large, the straightening plate cannot meet the product quality requirements, or the roll diameter is too small, and the straightening roller / the
universal joint is prone to being damaged are completely changed, under the condition of reliable and normal production and covering the specification range of the straightening plate, the straightness of plate straightening is obviously improved, the product quality is obviously improved, the straightening effect is more obvious for plates, especially for wide, thin and high-strength plates, and thus the potential and great benefit effect is brought.