CN215574239U - Nondestructive testing device for creep testing of metal material - Google Patents

Abstract

The utility model discloses a nondestructive testing device for creep testing of metal materials; the device comprises an acoustic detection module, an opto-acoustic detection module, an automatic scanning mechanism, a digitization module and signal analysis software; the nondestructive testing device for creep deformation testing improves the signal-to-noise ratio of testing and the repeatability of testing results by methods of sensor integration, scanning mechanism optimization, high-precision digital sampling and the like, and lays a foundation for improving the reliability of creep deformation nondestructive testing; the utility model provides stable and simplified detection conditions, improves the signal acquisition capability, and improves the repeatability of detection data and higher signal-to-noise ratio; the acoustic detection method and the photoacoustic detection method can be respectively used, the high integrity of signals is kept in the acquisition process, and a foundation is provided for subsequent deep analysis and comprehensive cross analysis; an automatic data acquisition mode can be adopted, a large amount of detection data can be rapidly acquired, and support is provided for statistical analysis of the detection data.

Description

Nondestructive testing device for creep testing of metal material

Technical Field

The utility model relates to the field of nondestructive testing, in particular to a nondestructive testing device for creep testing of a metal material.

Background

The metal material can generate slow deformation, called creep, under the high-temperature low-stress service state. The creep can cause the sudden rupture of a high-temperature metal structure, is an important reason for the failure of the metal structure in the petrochemical industry and the power industry, and the accurate estimation of the creep state and the creep service life of the high-temperature service metal structure is a current field problem.

At present, creep detection and monitoring of metal materials are mostly carried out by adopting a mode of combining parameter model extrapolation and local sampling test; however, the sampling ratio is small, so that the evaluation result has large dispersion and low accuracy. The nondestructive testing method has no damage to the testing object, can realize full coverage of the testing object under most conditions, is analyzed from the sampling proportion, and has higher potential reliability for creep state evaluation. Therefore, the nondestructive testing method for testing and monitoring the creep state of the metal material is widely concerned and researched, but the modulation effect of the creep structure on the nondestructive testing signal is weak, so that the sensitivity of the testing and monitoring signal is low, the testing and monitoring signal is easily interfered by coupling, a scanning mechanism and other noises, the repeatability of the testing and monitoring experiment is poor, and the fluctuation and the dispersion of data are also large.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a nondestructive testing apparatus for creep testing of a metal material, so as to solve the problems mentioned in the background art.

In order to achieve the purpose, the utility model provides the following technical scheme:

a nondestructive testing device for creep detection of metal materials comprises an acoustic detection module, a photoacoustic detection module, an automatic scanning mechanism, a digitization module and signal analysis software; the nondestructive testing device for creep deformation testing improves the signal-to-noise ratio of testing and the repeatability of testing results through methods of sensor integration, scanning mechanism optimization, high-precision digital sampling and the like, and lays a foundation for improving the reliability of creep deformation nondestructive testing.

As a still further scheme of the utility model: the acoustic detection sensor used by the acoustic detection module adopts a coaxial harmonic frequency sensor, and the basic model is fundamental frequency excitation-double frequency receiving, fundamental frequency excitation-half frequency doubling receiving or similar triple frequency and other frequency doubling models according to requirements.

As a still further scheme of the utility model: the acoustic detection module has a large receiving bandwidth and a large analog amplification range, and can ensure that signals in a large range are not distorted; the ultrasonic transducer can excite ultrasonic signals in a conventional range and has the functions of external synchronization and external triggering; as a further scheme of the utility model: the photoacoustic detection module comprises a laser ultrasonic transmitting device and a laser ultrasonic receiving device. As a still further scheme of the utility model: the photoacoustic detection module can use laser pulses with different pulse widths to excite ultrasound.

As a still further scheme of the utility model: the photoacoustic detection module comprises an optical ultrasonic receiving device and a piezoelectric ultrasonic receiving device, and has external synchronization and external triggering functions.

As a still further scheme of the utility model: the automatic scanning mechanism adopted by the utility model is driven by a pneumatic or hydraulic device, so that the noise caused by motor driving is eliminated; meanwhile, the grating ruler is adopted for positioning, so that the repetition precision and the absolute movement precision are ensured; the scanning mechanism can output an external trigger signal according to position step by step, and a unified clock for exciting and acquiring a detection signal is ensured; by matching with the mechanism, ultrasonic detection imaging and photoacoustic detection imaging of a detection object can be realized.

As a still further scheme of the utility model: the detection signal digitization module has the sampling precision of more than or equal to 14bits, the real-time sampling rate of more than or equal to 1GHz, and the-3 dB bandwidth of more than or equal to 400MHz, so that the integrity of signals is ensured, and the requirement of multiple harmonic parameter analysis can be met.

As a still further scheme of the utility model: the nondestructive testing device for creep testing can be used for signal acquisition of manual testing, wherein the manual testing is to manually control the position of a sensor to respectively finish acquisition and analysis of an acoustic testing signal and an opto-acoustic testing signal; the detection method comprises the steps that after the sensors are placed and coupled, the acoustic detection module excites ultrasonic detection signals, and meanwhile, the digitization module is triggered to complete signal acquisition and digitization; the photoacoustic detection module excites a photoacoustic signal and triggers the digitization module to complete the acquisition and digitization of the photoacoustic signal; the acquired signals are transmitted to signal analysis software of an upper computer through a bus to carry out sensitive parameter analysis, including multiple harmonic parameter analysis and other signal processing subprogram analysis, and comparison and evaluation are given to the detection sensitivity of different parameters.

A detection method of a nondestructive testing device for creep detection comprises the following steps: the automatic scanning mechanism clamps the acoustic detection module and/or the photoacoustic detection module to automatically scan and detect the detection test block, and triggers the acoustic detection module and/or the photoacoustic detection module step by step according to the position; the acoustic detection module excites an ultrasonic detection signal and triggers the digitization module to finish the acquisition and digitization of the signal; the photoacoustic detection module excites a photoacoustic signal and triggers the digitization module to complete the acquisition and digitization of the photoacoustic signal; the acquired signals are transmitted to signal analysis software of an upper computer through a bus to carry out sensitive parameter analysis, including multiple harmonic parameter analysis and other signal processing subprogram analysis, so that acoustic imaging and photoacoustic detection imaging of a detected object are realized, and detection sensitivity of different parameters is compared and evaluated.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model provides stable and simplified detection conditions, improves the signal acquisition capability, and improves the repeatability of detection data and higher signal-to-noise ratio; an acoustic detection method and a photoacoustic detection method can be used, the high integrity of signals is kept in the acquisition process, and a foundation is provided for subsequent deep analysis and comprehensive cross analysis; an automatic data acquisition mode can be adopted, a large amount of detection data can be rapidly acquired, and support is provided for statistical analysis of the detection data.

Drawings

FIG. 1 is a diagram of a manual mode apparatus of a nondestructive testing apparatus for creep testing of a metallic material.

FIG. 2 is a diagram of an automatic scanning mode apparatus of a nondestructive testing apparatus for creep testing of a metallic material.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, in an embodiment of the present invention, a nondestructive testing apparatus for creep testing of a metal material includes an acoustic testing module, a photoacoustic testing module, an automatic scanning mechanism, a digitizing module, and signal analysis software; the nondestructive testing device for creep deformation testing improves the signal-to-noise ratio of testing and the repeatability of testing results through methods of sensor integration, scanning mechanism optimization, high-precision digital sampling and the like, and lays a foundation for improving the reliability of creep deformation nondestructive testing.

The acoustic detection sensor used by the acoustic detection module adopts a coaxial harmonic frequency sensor, and the basic model is fundamental frequency excitation-double frequency receiving, fundamental frequency excitation-half frequency doubling receiving or similar triple frequency and other frequency doubling models according to requirements. The sensor adopts an integrated design, and the coupling area is not larger than that of a conventional sensor; compared with a separated creep deformation ultrasonic sensor, the sensor has the advantages of good sound field consistency, high coupling stability, good signal repeatability and the like.

The acoustic detection module has a large receiving bandwidth and a large analog amplification range, and can ensure that signals in a large range are not distorted; can excite ultrasonic signals in a conventional range, and has the functions of external synchronization and external trigger work.

The photoacoustic detection module comprises a laser ultrasonic transmitting device and a laser ultrasonic receiving device, has external synchronization and external triggering functions, is integrated, is in point contact or non-contact with a detection object, and can more easily realize stable detection conditions.

The photoacoustic detection module can generate laser pulses with different pulse widths and different intensities, has power regulation capability in a certain range, and can realize excitation parameter optimization in a certain range aiming at a specific detection object. The photoacoustic detection module can receive ultrasound by adopting an optical method and can also receive ultrasound by adopting a piezoelectric method, has higher flexibility, can be combined with the acoustic module for detection, and fully acquires data.

The automatic scanning mechanism adopted by the utility model is driven by a pneumatic or hydraulic device, so that the noise caused by motor driving is eliminated; meanwhile, the grating ruler is adopted for positioning, so that the repetition precision and the absolute movement precision are ensured; the scanning mechanism can output an external trigger signal according to position step by step, and a unified clock for exciting and acquiring a detection signal is ensured; by matching with the mechanism, ultrasonic detection imaging and photoacoustic detection imaging of a detection object can be realized. .

The detection signal digitization module has the sampling precision of more than or equal to 14bits, the real-time sampling rate of more than or equal to 1GHz, and the-3 dB bandwidth of more than or equal to 400MHz, so that the integrity of signals is ensured, and the requirement of multiple harmonic parameter analysis can be met.

The signal analysis software adopts an open architecture, and can introduce different signal processing subprograms to extract different detection parameters; meanwhile, the numerical values and the variation trends of different parameters can be displayed in a plurality of windows in parallel, and comparison and evaluation are given to the detection sensitivity.

The nondestructive testing device for creep testing can be used for signal acquisition of manual testing and also can be used for signal acquisition of automatic testing; the manual detection is that the position of the sensor is controlled manually to respectively finish the acquisition and analysis of an acoustic detection signal and a photoacoustic detection signal; the detection method comprises the steps that after the sensors are placed and coupled, the acoustic detection module excites ultrasonic detection signals, and meanwhile, the digitization module is triggered to complete signal acquisition and digitization; the photoacoustic detection module excites a photoacoustic signal and triggers the digitization module to complete the acquisition and digitization of the photoacoustic signal; the acquired signals are transmitted to signal analysis software of an upper computer through a bus to carry out sensitive parameter analysis, including multiple harmonic parameter analysis and other signal processing subprogram analysis, and comparison and evaluation are given to the detection sensitivity of different parameters.

A detection method of a nondestructive testing device for creep detection comprises the following steps: the automatic scanning mechanism clamps the acoustic detection module and/or the photoacoustic detection module to automatically scan and detect the detection test block, and triggers the acoustic detection module and/or the photoacoustic detection module step by step according to the position; the acoustic detection module excites an ultrasonic detection signal and triggers the digitization module to finish the acquisition and digitization of the signal; the photoacoustic detection module excites a photoacoustic signal and triggers the digitization module to complete the acquisition and digitization of the photoacoustic signal; the acquired signals are transmitted to signal analysis software of an upper computer through a bus to carry out sensitive parameter analysis, including multiple harmonic parameter analysis and other signal processing subprogram analysis, so that acoustic imaging and photoacoustic detection imaging of a detected object are realized, and detection sensitivity of different parameters is compared and evaluated.

The working principle of the utility model is as follows:

the detection device combines acoustic detection and photoacoustic detection for the first time, and forms a new technology and a new method for creep detection of metal materials. A special scanning mechanism is designed and adopted for reducing noise interference, and the stability of detection conditions is fully ensured in all aspects by designing and adopting a digital module with a large dynamic range and a high sampling rate characteristic, a corresponding detection tool and a special integrated detection sensor; by simplifying experimental operating conditions and reducing noise sources and a method for comprehensively processing and contrastively analyzing various detection data, the problems of poor repeatability, large data fluctuation and the like in the creep detection process of the metal material are greatly improved, and a foundation is laid for improving the reliability of creep nondestructive detection.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (1)

1. A nondestructive testing device for creep detection of metal materials is characterized by comprising an acoustic detection module, a photoacoustic detection module, an automatic scanning mechanism, a digitization module and signal analysis software; the nondestructive testing device for creep testing improves the signal-to-noise ratio of testing and the repeatability of testing results through sensor integration, scanning mechanism optimization and a high-precision digital sampling method; the acoustic detection sensor used by the acoustic detection module adopts a coaxial harmonic frequency sensor, and the basic model is fundamental frequency excitation-double frequency receiving, fundamental frequency excitation-half frequency doubling receiving or triple frequency doubling; the acoustic detection module has a larger receiving bandwidth and a larger analog amplification range, and can ensure that signals in a larger range are not distorted; the ultrasonic transducer can excite ultrasonic signals in a conventional range and has the functions of external synchronization and external triggering; the photoacoustic detection module comprises a laser ultrasonic transmitting device and a laser ultrasonic receiving device; the photoacoustic detection module can excite ultrasound by using laser pulses with different pulse widths; the photoacoustic detection module comprises an optical ultrasonic receiving device and a piezoelectric ultrasonic receiving device; the automatic scanning mechanism is driven by a pneumatic or hydraulic device, so that noise caused by motor driving is eliminated; meanwhile, the grating ruler is adopted for positioning, so that the repetition precision and the absolute movement precision are ensured; the scanning mechanism outputs an external trigger signal according to position step by step, and a unified clock for exciting and acquiring a detection signal is ensured; the ultrasonic detection imaging and the photoacoustic detection imaging of the detection object are realized by matching with the mechanism; the sampling precision of the digitization module is more than or equal to 14bits, the real-time sampling rate is more than or equal to 1GHz, and the-3 dB bandwidth is more than or equal to 400 MHz.

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