转子中心孔探伤是预防汽轮机转子断裂事故的一个重要检查手段。为此,首先要拆卸转子中心孔闷头。以往闷头都是靠拉螺栓拉出,特别是高、中压转子闷头由于在高温下长时间运行,产生塑性变形而胀死,造成拉螺栓断裂,在检修中贻误工期,有时则因闷头拆不下来,而放弃探伤检查。 Rotor center hole flaw detection is an important measure to prevent turbine rotor rupture. To do this, we must first disassemble the rotor center hole bulk head. In the past are closed by pulling the bolt pull out, especially high and medium pressure rotor bulging due to prolonged operation at high temperatures, resulting in plastic deformation and expansion, resulting in pull bolt fracture, overhaul in the maintenance period, sometimes because of bulk head dismantling Down, and give up the inspection.