An ultrasonic automatic inspection device for blade root

Abstract

The invention belongs to the technical field of nuclear power station steam turbine blade and other steam turbine blade ultrasonic nondestructive test and relates to a blade root ultrasonic automatic inspection device. Two ends of a flexible guide rail are respectively fixed to two side ends of a steam turbine blade through a fixing fork and a locking fork, wire rope guide blocks are uniformly arranged between the steam turbine blade and the flexible guide rail, the middle of the wire rope guide block is provided with a steel wire rope transmission guiding aperture, a steel wire rope goes through the steel wire rope transmission guiding aperture and form a closed ring, the steel wire rope can move along the flexible guide rail, a scanning arm is connected to the steel wire rope and can slide along the flexible guide rail, a motor driver is installed on the flexible guide rail and is close to the outer side of the locking fork, a positioning rack is fixed to the flexible guide rail and is located between the scanning arm and the locking fork, the motor driver drives the steel wire rope to move and the steel wire rope drives the scanning arm to move on the flexible guide rail. The device is suitable for a small use space and complex detected object shape and structure.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic non-destructive testing of steam turbine blades of nuclear power plants and other steam turbine blades, and in particular relates to an ultrasonic automatic inspection device for blade roots. Background technique [0002] The steam turbine is the main component of the conventional island of a nuclear power plant, and the component with the highest operating requirements and the largest workload in the steam turbine is the steam turbine rotor. The rotor is equipped with seven stages of blades, the number of which is over a thousand. Each blade rotates rapidly in an extremely harsh environment, and the root of the blade bears tens to hundreds of tons of various stresses, so it is easy to cause cracks at the root of the blade during operation. [0003] The integrity of the steam turbine blade structure is a key factor related to the safe and stable operation of the steam turbine. Due to the limit...

AI Technical Summary

Problems solved by technology

The inspection efficiency of this method is low, and the personnel work intensity is high, and the location of the detected defects is poor. Therefore, there must be an inspection device that can realize the automatic ultrasonic scanning of the root of the steam turbine blade.

[0004] At present, the automatic inspection equipment known at home and abroad is only the automatic scanning device designed by ZETEC for the root of the last-stage blade of the steam turbine MARK II low-pressure rotor of Daya Bay Nuclear Power Plant.

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