Press-down loosening device for four-roller reversible tungsten-molybdenum hot rolling mill

The invention discloses an press-down loosening device for a four-roller reversible tungsten-molybdenum hot rolling mill. The press-down loosening device comprises a double-cavity hydraulic cylinder body arranged between two press-down reduction boxes, and an electromagnetic clutch is further arranged between high-speed shafts of the two press-down reduction boxes. The double-cavity hydraulic cylinder body is installed in a sliding rail of a support through a sliding bearing. The double-cavity hydraulic cylinder body is fixedly connected with a thickened arm, and the other end of the thickened arm is hinged to a piston rod of a lifting hydraulic cylinder. A pair of loosening hydraulic cylinders are arranged in the double-cavity hydraulic cylinder body, and the outer end of a loosening piston rod of the loosening hydraulic cylinder on each side penetrates out of a cylinder cover of the corresponding side of the double-cavity hydraulic cylinder body. A piston rod end face gear is connected with the outer end of the loosening piston rod of each side, and a gear on the end face of the piston rod of each side corresponds to a gear of the end face of a worm of the press-down reduction box of the corresponding side. According to the press-down loosening device for the four-roller reversible tungsten-molybdenum hot rolling mill, the use requirement can be met, the power of a motor is not increased, and equipment cost is saved.