Metal welding on-line detection device based on LIBS technology

Abstract

The utility model relates to LIBS technology, specifically provide based on LIBS technology's metal welding on -line detection device, include: LIBS detection unit, including light source, receiving module and analysis module, first discernment unit is used for discerning the position of metal weld joint, drive unit is used for driving the light source movement, makes the emergent light of light source focus at weld joint, the utility model has on -line, result accurate etc.

Description

Technical Field

[0001] This utility model relates to LIBS technology, and in particular to an online inspection device for metal welding based on LIBS technology. Background Technology

[0002] LIBS technology is an emission spectroscopy analysis method that uses laser as a light source to excite samples and obtain the spectra of elements in the samples for analysis. This method requires expanding and focusing the laser beam to focus the laser energy onto the sample surface in order to obtain high-energy spectra.

[0003] Currently, LIBS technology is used in the analysis of stationary samples. When applied to moving samples, the following technical problems arise:

[0004] 1. Due to the fixed light source, it is impossible to ensure that the emitted light from the light source hits the weld.

[0005] 2. It cannot be guaranteed that the emitted light will be focused on the weld.

[0006] 3. It cannot provide real-time calibration, meaning that detection accuracy cannot be guaranteed.

[0007] Due to the aforementioned technical issues, LIBS technology cannot be applied to steel pipe welding. Summary of the Invention

[0008] To address the shortcomings of the existing technical solutions, this utility model provides an online metal welding inspection device based on LIBS technology.

[0009] The objective of this utility model is achieved through the following technical solution:

[0010] An online inspection device for metal welding based on LIBS technology, comprising:

[0011] The LIBS detection unit includes a light source, a receiving module, and an analysis module.

[0012] The first identification unit is used to identify the location of the metal weld.

[0013] A driving unit is used to drive the light source to move, so that the emitted light from the light source is focused on the weld.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. Real-time, online detection has been achieved;

[0016] Based on the weld identification results of the first identification unit, the light source of the LIBS detection unit is moved by the driving unit, and with the operation of the second identification unit, the emitted light of the light source is accurately focused on the weld, thereby realizing real-time online detection.

[0017] 2. High detection accuracy;

[0018] By utilizing the speed and accuracy of LIBS technology, rapid and accurate detection of metals and non-metals at metal welds can be achieved.

[0019] By using standard samples set on the support, real-time calibration was achieved, further improving the accuracy of the test. Attached Figure Description

[0020] The disclosure of this utility model will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are merely illustrative of the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. In the drawings:

[0021] Figure 1 This is a simplified structural diagram of the online metal welding inspection device of this utility model. Detailed Implementation

[0022] Figure 1 The following description illustrates optional embodiments of the present invention to teach those skilled in the art how to implement and reproduce it. For the purpose of teaching the technical solutions of the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art should understand that variations or substitutions derived from these embodiments will be within the scope of the present invention. Those skilled in the art should understand that the following features can be combined in various ways to form multiple variations of the present invention. Therefore, the present invention is not limited to the following optional embodiments, but is defined only by the claims and their equivalents.

[0023] Example 1.

[0024] This utility model provides an online metal welding inspection device based on LIBS technology, such as... Figure 1 As shown, the online metal welding inspection device includes:

[0025] The LIBS detection unit includes a light emission module 11, a receiving module 12, and an analysis module 13. The light emission module 11 includes a light source and a converging lens. The LIBS detection unit is prior art in the field of spectroscopy, as described in the applicant's previous patent CN2020100870698.

[0026] The first identification unit 21 is used to identify the position of the metal weld.

[0027] The driving unit 31 is used to drive the light source to move so that the emitted light from the light source is focused on the weld.

[0028] To ensure that the emitted light is accurately focused on the weld, the online metal welding inspection device further includes:

[0029] The second identification unit 22 is used to identify whether the emitted light is focused on the weld.

[0030] To ensure accurate identification, the second identification unit 22 further employs a visual identification unit or a ranging unit, which is mounted on the robotic arm 31 to measure the distance between the light source and the weld seam, such that the distance is equal to the focal length of the converging lens.

[0031] To provide real-time correction functionality, the online metal welding inspection device further includes:

[0032] A support (not shown) is used to support multiple standard samples, and a driving unit is used to drive the light source to move so that the emitted light from the light source is focused on the standard samples, thereby calibrating the LIBS detection unit in real time.

[0033] Example 2.

[0034] Example of the application of the LIBS-based online metal welding inspection device in steel pipe welding according to Embodiment 1 of this utility model.

[0035] In this application example, such as Figure 1 As shown, the LIBS detection unit includes a light emitting module 11, a receiving module 12, and an analysis module 13. The light emitting module 11 includes a laser and a converging lens, and is mounted on the driving unit 31 (in this embodiment, a three-dimensional robotic arm is used, providing vertical up-and-down movement and horizontal rotation). The receiving module 12 includes a lens group and a spectrometer. The lens group is mounted on the driving unit 31 and is connected to the spectrometer via an optical fiber 14.

[0036] The first identification unit 21 employs a visual identification unit to identify the location of the weld seam between steel pipes 1. Visual identification is existing technology, and its specific structure and operation will not be described again.

[0037] The second identification unit 22 adopts a ranging unit, specifically a laser rangefinder, which is set on the three-dimensional robotic arm to obtain the distance between the light source (or converging lens) and the weld.

[0038] The gas supply unit 41 includes an argon gas cylinder and a pipeline, from which argon gas is discharged to purge the ignition point of the weld.

[0039] Various grades of steel standard samples are placed on the support, and a three-dimensional robotic arm drives the light source so that the laser beam is focused onto the standard sample.

[0040] The metal welding inspection device in this embodiment operates as follows:

[0041] The first identification unit 21 uses image recognition technology to identify the location of the weld;

[0042] The driving unit 31 drives the light emitting module 11 and the receiving module 12 to move according to the position. At the same time, the laser rangefinder obtains the distance between the light source and the weld. When the distance between the converging lens and the weld is equal to the focal length of the converging lens, the driving unit 31 stops moving.

[0043] The emitted light from the laser is focused onto the weld seam by a converging lens. The light at the weld seam passes through a lens group and then through fiber optic cable 14 to a spectrometer. The spectrometer disperses the light and converts it into an electrical signal through a linear array detector. The electrical signal is then sent to the analysis module 13.

[0044] During the excitation process, the laser rangefinder outputs the distance in real time. When the distance between the converging lens and the weld deviates from the focal length of the converging lens, the drive unit 31 drives the light source to move, so that the distance between the converging lens and the weld is equal to the focal length. Argon gas supplied by the gas supply unit 41 purges the excitation area of ​​the weld.

[0045] After a period of use, the drive unit 31 drives the light source to move, cooperating with the laser rangefinder to make the distance between the converging lens and the standard sample equal to the focal length. The emitted light from the laser is focused onto the standard sample by the converging lens, and the excitation light on the standard sample is received by the receiving module 12 and sent to the analysis module 13. A correction coefficient is obtained based on the measured value output by the analysis module 13 and the nominal value of the standard sample, and is used for weld detection. The determination of the correction coefficient is existing technology in the field of analytical instruments.

[0046] Example 3.

[0047] According to Embodiment 1 of this utility model, the application example of the online metal welding inspection device based on LIBS technology in copper pipe welding differs from Embodiment 2 in that:

[0048] 1. The second identification unit adopts a visual identification unit, which uses image recognition technology to identify whether the emitted light is focused on the weld or the standard sample.

[0049] 2. Prepare various standard samples that match the copper tubes.

[0050] 3. The three-dimensional robotic arm provides translational motion in the forward, backward, left, right, and up and down directions.

Claims

1. An online inspection device for metal welding based on LIBS technology, characterized in that, The LIBS-based online metal welding inspection device includes: The LIBS detection unit includes a light source, a receiving module, and an analysis module. The first identification unit is used to identify the location of the metal weld. A driving unit is used to drive the light source to move so that the emitted light from the light source is focused on the weld seam. The second identification unit is used to identify whether the emitted light is focused on the weld.

2. The online metal welding inspection device based on LIBS technology according to claim 1, characterized in that, The second identification unit is a visual identification unit or a ranging unit, which is mounted on a robotic arm to obtain the distance between the light source and the weld.

3. The online metal welding inspection device based on LIBS technology according to claim 2, characterized in that, The first recognition unit is a visual recognition unit, and the ranging unit is a laser rangefinder.

4. The online metal welding inspection device based on LIBS technology according to claim 1, characterized in that, The drive unit is a three-dimensional robotic arm.

5. The online metal welding inspection device based on LIBS technology according to claim 1, characterized in that, The online metal welding inspection device also includes: The carrier is used to support multiple standard samples, and the driving unit is used to drive the light source to move so that the emitted light from the light source is focused on the standard samples.

6. The online metal welding inspection device based on LIBS technology according to claim 1, characterized in that, The light source is a laser, and the receiving module includes a lens group and a spectrometer, with the lens group mounted on the driving unit.

7. The online metal welding inspection device based on LIBS technology according to claim 1, characterized in that, The online metal welding inspection device also includes: A gas supply unit is provided to supply inert gas and purge the weld.

Images