Pressure pipeline ultrasonic internal detection automation device

Abstract

The invention relates to a pressure pipeline ultrasonic internal detection automation device; a purpose comprises that the provided device can meet detection requirements of a larger-diameter pipeline and has the characteristics of high detection accuracy and high detection efficiency. The technical scheme comprises that the pressure pipeline ultrasonic automatic detection device comprises a pipeline crawling robot, a probe assembly device, encoders, centralizers, supporting frames, a phased array module device and an ultrasonic detecting instrument; the probe assembly device comprises a first annular phased array probe assembly, a second annular phased array probe assembly, a conical phased array probe assembly for detecting defects of inner and outer surfaces and an interior circumference, and corresponding probe holding devices; the first annular phased array probe assembly, the second annular phased array probe assembly and the conical phased array probe assembly are each composed of more than 3 of 128 array element phased array probes; ultrasonic waves emitted by piezoelectric crystal plates of the probe assemblies firstly pass through an annular concave lens and then scan circumferential pipeline walls.

Description

technical field [0001] The invention relates to the field of pressure pipeline ultrasonic testing, in particular to an ultrasonic phased array automatic internal detection device for pressure pipeline defects. Background technique [0002] Pipeline transportation is one of the five major modes of transportation along with railways, highways, water transportation, and aviation. Pressure pipes are special equipment used to transport fluid media under a certain temperature and pressure. They are widely used in petrochemical, metallurgy, electric power and other industries, as well as public life such as urban gas and heating systems. Some of these media are explosive, toxic or destructive to the environment. Once leaked, it will cause casualties, property losses, environmental pollution and huge economic losses, and sometimes affect people's lives. Therefore, the pressure pipelines in use should be inspected regularly at regular intervals. However, the periodic inspection of ...

AI Technical Summary

Problems solved by technology

The reason is that pressure pipes have the following characteristics: (1) There are many types and quantities, and there are many links in design, manufacture, installation, and application management; (2) The slenderness ratio is large, the spanning space is large, and the boundary conditions are complicated; (3) The material application There are many types and complex selection; (4) There are many components such as elbows and tees, and the product quality assurance is poor. According to accident analysis, it accounts for 30∽40%; (5) The distribution of pressure pipelines is extremely wide, with many points, wide areas, The length of the line and other characteristics; and the transmission medium is complex, the pressure, temperature, and chemical properties of the medium are changeable, and the stress situation is complicated; (6) Most of the pipelines in use have not been inspected by supervisory inspection, the design and use are unknown, and the safety status is difficult. It is determined that there is a big gap between the installation quality and the current standard. How to deal with the over-standard defects of the pressure pipeline and how to scientifically and accurately evaluate the safety of the pressure pipeline have become difficult points

(7) Many pipelines are laid underground, and many pipelines are laid in trenches, making external detection difficult

The above methods all use conventional ultrasonic straight probes, which cannot form a circumferential automatic electronic scan

The multi-element ultrasonic array method needs to achieve a certain coverage of the transducer detection area, and the water immersion focusing method cannot be used, resulting in detection sensitivity and resolution far lower than that of the focusing probe

Although the detection efficiency of the built-in rotary ultrasonic detection (IRIS) is high, after the second 45° mirror reflection, not only the use of sound pressure reflectivity is lost, but also the focal length becomes longer, which is not conducive to the improvement of lateral resolution

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