Ultrasonic phased array full-automatic detection method for blades and blade roots of nuclear power station low-pressure cylinder shrinkage-fit rotor steam turbine

Abstract

The invention relates to an ultrasonic phased array full-automatic detection method for blades and blade roots of a nuclear power station low-pressure cylinder shrinkage-fit rotor steam turbine. Setting and a walking area of a phased array probe are determined according to different detection areas; the phased array probe is arranged at the outer arc side of a blade root to detect the inner arc side surface of the blade root; the phased array probe is arranged at the inner arc side of the blade root to detect the outer arc side surface of the blade root; the phased array probe is arranged at an outer arc side platform of the air outlet side of the blade root to detect the inner arc side face and the outer arc side face of the air outlet side of the blade root; and the phased array probe isarranged on an outer arc side platform at the air inlet side of the blade root to detect the inner arc side face and the outer arc side face of the air inlet side of the blade root. According to theinvention, the root of the blade can be detected under the conditions of not lifting the cylinder and dismounting the blade; and the operation is simple, and the data interpretation is accurate.

Description

technical field [0001] The invention relates to an ultrasonic phased array automatic detection method for the blade root of a steam turbine blade root of a low-pressure cylinder red jacket in a nuclear power plant, and belongs to the technical field of phased array ultrasonic inspection. Background technique [0002] The steam turbine is an essential operating equipment for power plants. Due to the centrifugal force generated by the high-speed rotating blades, the stress concentration is caused on the root of the blade. After a certain number of years of operation, the root of the blade is prone to form stress fatigue cracks, and the cracks are all generated on the surface of the root of the blade. , This kind of crack is extremely harmful. When the crack expands to a certain extent, the blade is easy to fly off the factory and cause an accident. Therefore, the crack at the root of the blade poses a major safety hazard. Therefore, it is necessary to detect the root of the bla...

AI Technical Summary

Problems solved by technology

[0002] The steam turbine is an essential operating equipment for power plants. Due to the centrifugal force generated by the high-speed rotating blades, the stress concentration is caused on the root of the blade. After a certain number of years of operation, the root of the blade is prone to form stress fatigue cracks, and the cracks are all generated on the surface of the root of the blade. , this kind of crack is extremely harmful. When the crack expands to a certain extent, the blade is easy to fly out of the workshop and cause an accident. Therefore, the crack at the root of the blade has a major safety hazard. Therefore, it is necessary to detect the root of the blade to ensure the safe operation of the steam turbine.

[0003] There are many existing methods for detecting the blade root, such as eddy current technology, magnetic particle technology, penetration technology and conventional ultrasonic technology, etc., but using these technologies to detect the blade root needs to hang the cylinder first, and then remove the blades from the rotor one by one After the inspection is completed, the blades need to be installed on the rotor again, and the time for disassembling and assembling the blades is almost equal to the time for inspecting the blades, which consumes a lot of time and affects work efficiency

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