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

Abstract

The utility model discloses a non-destructive testing device for creep detection of metal materials, comprising an acoustic detection module, a photoacoustic detection module, an automatic scanning mechanism, a digitization module and signal analysis software; the non-destructive detection device for creep detection The device improves the signal-to-noise ratio of detection and the repeatability of the detection results by means of sensor integration, scanning mechanism optimization, high-precision digital sampling and other methods, and lays a foundation for improving the reliability of creep non-destructive testing; Simplified detection conditions, improved signal acquisition capabilities, improved test data repeatability and higher signal-to-noise ratio; acoustic detection methods and photoacoustic detection methods can be used respectively, and the acquisition process maintains high signal integrity, which is a good source for subsequent detection. The in-depth analysis and comprehensive cross-analysis provide the foundation; the automatic data collection mode can be adopted, which can quickly obtain a large amount of test data and provide support for the statistical analysis of the test data.

Description

A non-destructive testing device for creep testing of metallic materials

technical field

The utility model relates to the field of non-destructive testing, in particular to a non-destructive testing device used for creep detection of metal materials.

Background technique

Under the service state of high temperature and low stress, metal materials will produce slow deformation, which is called creep. Creep can cause sudden rupture of high-temperature metal structures, which is an important reason for the failure of metal structures in petrochemical and power industries. Accurately estimating the creep state and creep life of metal structures in high-temperature service is a current field problem.

At present, most of the creep detection and monitoring of metal materials are carried out by the combination of parameter model extrapolation and local sampling test. However, due to the small sampling ratio, the evaluation results have large dispersion and low accuracy. The non-destructive testing method has no damage to the test object, and can achieve full coverage of the test object under most conditions. From the analysis of the sampling ratio, the potential reliability of the creep state evaluation is higher. Therefore, the nondestructive testing method for the detection and monitoring of the creep state of metal materials has received extensive attention and a lot of research. However, due to the weak modulation effect of the creep structure on the nondestructive testing signal, the sensitivity of the detection and monitoring signal is low and it is easy to be affected. Due to the interference of coupling, scanning mechanism and other noises, the repeatability of detection and monitoring experiments is poor, and the fluctuation and dispersion of data are also large.

Utility model content

The purpose of the present invention is to provide a non-destructive testing device for creep detection of metal materials, so as to solve the problems raised in the above background technology.

To achieve the above object, the utility model provides the following technical solutions:

A non-destructive testing device for creep detection of metal materials, comprising an acoustic detection module, a photoacoustic detection module, an automatic scanning mechanism, a digitization module and signal analysis software; the non-destructive testing device for creep detection is integrated by sensors, Scanning mechanism optimization, high-precision digital sampling and other methods have improved the signal-to-noise ratio of detection and the repeatability of detection results, laying a foundation for improving the reliability of creep non-destructive testing.

As a further scheme of the present invention: the acoustic detection sensor used by the acoustic detection module adopts a coaxial harmonic frequency sensor, and the basic models are fundamental frequency excitation-double frequency reception, fundamental frequency excitation-half frequency multiplication according to needs Receive or similar triple and other multiplier models.

As a further solution of the present invention: the acoustic detection module has a large receiving bandwidth and an analog amplification range, which can ensure that a large range of signals is not distorted; it can excite ultrasonic signals in a conventional range, and has external synchronization and external synchronization. Trigger function; as a further scheme of the present invention: the photoacoustic detection module includes a laser ultrasonic transmitting device and a laser ultrasonic receiving device. As a further solution of the present invention, the photoacoustic detection module can use laser pulses with different pulse widths to excite ultrasound.

As a further solution of the present invention, the photoacoustic detection module includes an optical ultrasonic receiving device and a piezoelectric ultrasonic receiving device, and has external synchronization and external triggering functions.

As a further scheme of the present utility model: the automatic scanning mechanism adopted in the present utility model is driven by pneumatic or hydraulic devices, which eliminates the noise caused by the motor drive; meanwhile, the grating ruler is used for positioning, which ensures the repeatability and absolute motion accuracy; The scanning mechanism can output external trigger signals according to position steps, ensuring a unified clock for excitation and acquisition of detection signals; with this mechanism, ultrasonic detection imaging and photoacoustic detection imaging of detection objects can be realized.

As a further scheme of the present utility model: the detection signal digitization module has a sampling accuracy of ≥14bits, a real-time sampling rate of ≥1GHz, and a -3dB bandwidth of ≥400MHz, which ensures the integrity of the signal and can meet the needs of multiple harmonic parameter analysis. .

As a further scheme of the present invention: the non-destructive testing device for creep detection can be used for signal acquisition of manual detection, and manual detection is to manually control the position of the sensor to complete the acquisition and analysis of the acoustic detection signal and the photoacoustic detection signal respectively. The detection method is that after the sensor is placed and the coupling is completed, the acoustic detection module excites the ultrasonic detection signal, and at the same time triggers the digitization module to complete the acquisition and digitization of the signal; the photoacoustic detection module excites the photoacoustic signal, and simultaneously triggers the digitization module to complete the matching. Collection and digitization of photoacoustic signals; the collected signals are transmitted to the signal analysis software of the host computer through the bus to analyze sensitive parameters, including multiple harmonic parameter analysis and other signal processing subroutine analysis, and detect different parameters Sensitivity is given for comparison and evaluation.

A detection method for a non-destructive testing device used for creep detection, comprising the following steps: an automatic scanning mechanism clamps an acoustic detection module and/or a photoacoustic detection module to automatically scan and detect a detection test block, and triggers according to position steps The acoustic detection module and/or the photoacoustic detection module; the acoustic detection module stimulates the ultrasonic detection signal, and at the same time triggers the digitization module to complete the acquisition and digitization of the signal; the photoacoustic detection module stimulates the photoacoustic signal, and simultaneously triggers the digitization module to complete the photoacoustic signal. The collected signal is transmitted to the signal analysis software of the host computer through the bus to carry out sensitive parameter analysis, including multiple harmonic parameter analysis and other signal processing subroutine analysis, to achieve acoustic imaging and photoacoustic detection of the object. Detect imaging, and compare and evaluate the detection sensitivity of different parameters.

Compared with the prior art, the beneficial effects of the present utility model are:

The utility model provides stable and simplified detection conditions, improves the signal acquisition capability, improves the repeatability of the detection data and has a higher signal-to-noise ratio; the acoustic detection method and the photoacoustic detection method can be used, and the acquisition process maintains the high integrity of the signal , which provides a basis for subsequent in-depth analysis and comprehensive cross-analysis; the automatic data collection mode can be used to quickly obtain a large amount of test data, providing support for statistical analysis of test data.

Description of drawings

Fig. 1 is a manual mode device diagram of a non-destructive testing device used for creep detection of metal materials.

FIG. 2 is a diagram of an automatic scanning mode device of a non-destructive testing device used for creep detection of metal materials.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Referring to FIGS. 1-2, in an embodiment of the present invention, a nondestructive testing device for creep detection of metal materials includes an acoustic detection module, a photoacoustic detection module, an automatic scanning mechanism, a digitization module, and a signal analysis software; The non-destructive testing device used for creep detection improves the signal-to-noise ratio of detection and the repeatability of detection results by means of sensor integration, optimization of scanning mechanism, high-precision digital sampling, etc., and improves the reliability of creep non-destructive testing. Foundation.

The acoustic detection sensor used in the acoustic detection module adopts a coaxial harmonic frequency sensor, and the basic model is fundamental frequency excitation-double frequency reception, fundamental frequency excitation-half frequency reception or similar triple frequency and other times as required. frequency model. The sensor adopts an integrated design, and the coupling area is not larger than that of the conventional sensor; compared with the separate creep ultrasonic sensor, it has the advantages of good sound field consistency, high coupling stability, and good signal repeatability.

The acoustic detection module has a large receiving bandwidth and an analog amplification range, which can ensure that a large range of signals is not distorted; can excite ultrasonic signals in a conventional range, and has external synchronization and external triggering functions.

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

The photoacoustic detection module can generate laser pulses with different pulse widths and different intensities, has a certain range of power adjustment capability, and can realize the optimization of excitation parameters within a certain range for specific detection objects. The photoacoustic detection module can receive ultrasonic waves by an optical method and can also receive ultrasonic waves by a piezoelectric method, has high flexibility, and can perform combined detection with an acoustic module to fully acquire data.

The automatic scanning mechanism adopted by the utility model is driven by a pneumatic or hydraulic device, which eliminates the noise caused by the motor drive; meanwhile, the grating ruler is used for positioning, which ensures the repeatability and absolute motion accuracy; the scanning mechanism can output step by step according to the position. The external trigger signal ensures a unified clock for excitation and acquisition of the detection signal; with this mechanism, the ultrasonic detection imaging and photoacoustic detection imaging of the detection object can be realized. .

The detection signal digitization module has a sampling accuracy of ≥ 14 bits, a real-time sampling rate of ≥ 1 GHz, and a -3dB bandwidth of ≥ 400 MHz, which ensures the integrity of the signal and can meet the needs of multiple harmonic parameter analysis.

The signal analysis software adopts an open architecture, and can import different signal processing subroutines to realize the extraction of different detection parameters; at the same time, the values and changing trends of different parameters can be displayed in parallel in multiple windows, and the detection sensitivity can be compared. and assessment.

The non-destructive testing device for creep detection can be used for signal acquisition of manual detection, and can also be used for signal acquisition of automatic detection; manual detection is to manually control the position of the sensor, and complete the acquisition and detection of acoustic detection signals and photoacoustic detection signals respectively. Analysis; the detection method is that after the sensor is placed and the coupling is completed, the acoustic detection module excites the ultrasonic detection signal, and at the same time triggers the digitization module to complete the acquisition and digitization of the signal; the photoacoustic detection module stimulates the photoacoustic signal, and simultaneously triggers the digitization module to complete The collection and digitization of photoacoustic signals; the collected signals are transmitted to the signal analysis software of the host computer through the bus, and the sensitive parameters are analyzed, including the analysis of multiple harmonic parameters and other signal processing subroutines. Detection sensitivity is given for comparison and evaluation.

A detection method for a non-destructive testing device used for creep detection, comprising the following steps: an automatic scanning mechanism clamps an acoustic detection module and/or a photoacoustic detection module to automatically scan and detect a detection test block, and triggers according to position steps The acoustic detection module and/or the photoacoustic detection module; the acoustic detection module stimulates the ultrasonic detection signal, and at the same time triggers the digitization module to complete the acquisition and digitization of the signal; the photoacoustic detection module stimulates the photoacoustic signal, and simultaneously triggers the digitization module to complete the photoacoustic signal. The collected signal is transmitted to the signal analysis software of the host computer through the bus to carry out sensitive parameter analysis, including multiple harmonic parameter analysis and other signal processing subroutine analysis, to achieve acoustic imaging and photoacoustic detection of the object. Detect imaging, and compare and evaluate the detection sensitivity of different parameters.

The working principle of the utility model is:

The detection device combines acoustic detection and photoacoustic detection for the first time, forming a new technology and new method for creep detection of metal materials. A special scanning mechanism is designed and adopted to reduce noise interference. By designing and adopting digital modules with large dynamic range and high sampling rate, corresponding detection tooling and special integrated detection sensors, the detection conditions are fully guaranteed in all aspects. Stability: By simplifying the experimental operating conditions, reducing noise sources and comprehensively processing and comparing various testing data, the problems of poor repeatability and large data fluctuations in the process of creep testing of metal materials have been greatly improved, and the reliability of creep non-destructive testing has been improved. Sexual improvement laid the foundation.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention may be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments are to be considered in all respects as exemplary and not restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is therefore intended that the All changes within the meaning and range of the required equivalents are embraced within the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be 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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