Inspection device and inspection method

An inspection method for inspecting a turbine generator including a rotor main body and a stator facing outside of the rotor main body, the method comprising:

• a moving step of moving a moving main body on and along the rotor main body, while the moving main body is disposed in a gap between the rotor main body and the stator;
• an arm driving step of driving at least two arms attached to the moving main body so that the at least two arms each selectively takes a pressed position where the arm extends toward the stator to be pressed to the stator, and a detached position where the arm is detached from the stator;
• and
• an inspection step of inspecting at least one of the rotor main body and the stator, by at least one detector attached to at least one of the moving main body and the arms, wherein
• the arm driving step is conducted while at least one of the at least two arms are maintained in the pressed position,
• the moving body is connected with a cable extending an outer direction of the gap, the cable connected at an end of the moving main body,
• first and second springs are attached to the moving main body, each of the first and second springs biasing each arm for expanding toward the stator in a state that each arm contacts the stator and that is inclined toward a direction opposite to the end of the moving body,
• the arm driver drives the arms so that the arms each selectively takes the pressed position and the detached position,
• when the arm driver is operable, the moving main body moves itself on and along the rotor main body, while the main body moves and before one of the arms strikes a baffle of the stator, one of the arms is located in the detached position by the arm driver against a force of the first spring and the other arm is maintained to contact the stator by a force of the second spring, and
• when the arm driver is inoperable, the moving main body is pulled out of the gap by the cable on and along the rotor main body and when the arm strikes the baffle, one of the arms is pushed down toward the rotor main body by the baffle pushing the inclination of one of the arms against a force of the first spring and the other arm is maintained to contact the stator by a force of the second spring.