The fuselage is a C-type single arm structure. After welding, it is subject to vibration treatment to ensure that the fuselage is not deformed. The hydraulic system is located at the lower side of the fuselage, which is easy to operate. It is equipped with independent hydraulic and electrical control system, which adopts button centralized control, and can realize both fixed range and constant pressure forming processes, with functions of pressure display, stroke and pressure adjustment.