Electromagnetic ultrasonic transducer and on-line inspection system comprising same

An on-line inspection system comprising:

• an electromagnetic ultrasonic transducer;
• a lifting system configured to control lifting of the electromagnetic ultrasonic transducer;
• and
• a signal generation and processing system configured to control the electromagnetic ultrasonic transducer to perform an inspection operation;
• wherein the electromagnetic ultrasonic transducer comprises:
• a detection bottom surface and a stopper connected to a sidewall of the electromagnetic ultrasonic transducer;
• the stopper extends towards the detection bottom surface;
• a bottom surface of the stopper is lower than the detection bottom surface;
• a distance “d” between the bottom surface of the stopper and the detection bottom surface is in a range 0 mm<d≦1 mm;
• the bottom surface of the stopper contacts a surface of an object to be detected in a working state of the electromagnetic ultrasonic transducer;
• the on-line inspection system further comprises:
• a buffer device;
• wherein the buffer device comprises:
• a buffer arm, a scroll wheel, a first elastic buffer member and a buffer arm connection component;
• one end of the buffer arm is hinged to one sidewall of the electromagnetic ultrasonic transducer;
• the scroll wheel, in a scrollable state, is disposed on another end of the buffer arm;
• a bottom surface of the scroll wheel is lower than a bottom surface of the buffer arm;
• a rotation central axis of the scroll wheel is parallel to the sidewall of the electromagnetic ultrasonic transducer on which the buffer arm is hinged with the electromagnetic ultrasonic transducer;
• the first elastic buffer member is connected between the buffer arm and the buffer arm connection component to assist in the movement of the buffer arm;
• and
• the bottom surface of the scroll wheel has a state in which the bottom surface of the scroll wheel is lower than the bottom surface of the stopper in a non-working state of the electromagnetic ultrasonic transducer, and a state in which the bottom surface of the scroll wheel is level with the bottom surface of the stopper in a working state of the electromagnetic ultrasonic transducer.