Ultrasonic phased array imaging detection method for steam turbine blade root bolt holes

A steam turbine blade and ultrasonic phased array technology, which is applied to the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve problems such as the ultrasonic phased array detection method for bolt holes without fork-shaped blade roots, and achieves reduction of learning costs and savings. Time cost, the effect of saving assembly cost

Inactive Publication Date: 2016-02-10
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the inventors have found that most ultrasonic phased array detection methods detect the entire blade root, such as the root of a vertical tree blade, the root of a fungal blade, etc., and there is no ultrasonic phased array detection for the bolt holes of a fork blade root method

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  • Ultrasonic phased array imaging detection method for steam turbine blade root bolt holes
  • Ultrasonic phased array imaging detection method for steam turbine blade root bolt holes
  • Ultrasonic phased array imaging detection method for steam turbine blade root bolt holes

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Embodiment Construction

[0032] The present invention is further described in conjunction with the following examples.

[0033] An ultrasonic phased array imaging detection method for bolt holes at the root of a steam turbine blade, wherein the root of the blade is a fork-shaped blade root. In the related art, the fork-shaped blade root is divided into two-pronged blade roots, three-pronged blade roots, four-pronged blade roots, and seven-pronged blade roots according to the number of fork teeth. . However, no matter how many fork-shaped blade roots have, compared with the fork teeth arranged in the middle, the front fork teeth arranged at the front and the rear fork teeth arranged at the back receive the greatest stress, and the stress is concentrated Bolt holes at the top of the front and rear forks. Therefore, the inspection generally focuses on the bolt holes at the top of the front fork and rear fork.

[0034] In this example, if figure 1 with figure 2 As shown, the fork-shaped blade root 1...

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Abstract

The invention relates to an ultrasonic phased array imaging detection method for steam turbine blade root bolt holes. The detection method comprises the following steps that a first phased array probe is arranged on an inner arc side shoulder on the air inlet side of a blade root, and the air outlet side of the front fork tooth bolt hole and the air outlet side of the rear fork tooth bolt hole are detected; a second phased array probe is arranged on an outer arc front side shoulder on the air outlet side of the blade root, and the air inlet side of the front fork tooth bolt hole is detected; a third phased array probe is arranged on the outer arc rear side shoulder of the air outlet side of the blade root, and the air inlet side of the rear fork tooth bolt hole is detected. The ultrasonic phased array imaging detection method for the steam turbine blade root bolt holes has the advantages that the blade root of a steam turbine does not need to be demounted and mounted, and thus the assembling cost and the time cost of halt operation are saved while the detection precision is not affected. After parameters of a phased array detector are adjusted and stored, a detection result can be obtained without moving of the probes or with little moving of the probes after the phased array probes are attached to a workpiece, the detection efficiency is high, and time cost is saved.

Description

technical field [0001] The invention relates to the field of ultrasonic analysis and detection, in particular to an ultrasonic phased array imaging detection method for bolt holes at the root of steam turbine blades. Background technique [0002] The roots of steam turbine blades are subject to long-term stress during use and are prone to fatigue cracks, so they are the key inspection parts during maintenance. However, due to the dense arrangement of the blade roots of the steam turbine, the reserved detection space is limited, and the blade roots are inserted into the bearing housings and fixed with bolts. Therefore, it is necessary to remove all the blade roots of the steam turbine for penetration testing during maintenance, resulting in a long detection time. , The workload is heavy, and multiple disassembly and assembly have a great impact on the precision of the blade. In the related art, the ultrasonic phased array detection method is used to detect the root of the st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
Inventor 何成李文胜温冠伟赵建平纪轩荣张伟孙谊偂艾红张龙蔡庆生游溢
Owner STATE GRID CORP OF CHINA
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