Laser welding monitoring device and laser welding equipment thereof

Abstract

The utility model discloses a laser welding monitoring device and laser welding equipment thereof, the laser welding monitoring device comprises a lighting mechanism, the lighting mechanism is provided with a through hole, and reflected light enters the lighting mechanism through the through hole; the lighting mechanism is connected to the input end of the photoelectric conversion mechanism, and the photoelectric conversion mechanism is used for converting reflected light entering the lighting mechanism into electric signals; wherein the photoelectric conversion mechanism comprises a light splitting assembly and a conversion assembly, the light splitting assembly is used for splitting reflected light into different light beams according to the wavelength range, and the conversion assembly converts the light beams into corresponding electric signals. By means of the mode, real-time monitoring of the welding process is achieved, the light splitting assembly decomposes reflected light into light beams with different wavelengths according to the wavelength range, the conversion assembly converts all the light beams into corresponding electric signals, so that defects existing in weld joints are recognized, and the welding quality of workpieces is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser processing technical field especially relates to a laser welding monitoring devices and laser welding equipment thereof. BACKGROUND

[0002] Laser welding is a kind of high-efficiency precision welding mode using high-energy density laser beam as heat source, and laser welding mainly uses continuous pulse laser beam to weld materials, and under high-power density laser irradiation, materials evaporate and form small holes, and small holes generate high temperature under laser irradiation, so that metal is melted, and the purpose of connecting metal is achieved.Because laser processing has the characteristics of high energy density, large thermal gradient in processing area and fast processing speed, therefore, when there is a protrusion, crack or defect in a certain position of weld, it cannot be found in time. SUMMARY

[0003] The utility model discloses a laser welding monitoring device which overcomes the shortcomings of the prior art.

[0004] The utility model discloses a laser welding monitoring device which overcomes the shortcomings of the prior art.

[0005] The utility model discloses a laser welding monitoring device, which comprises a light collecting mechanism, a through hole is arranged in the light collecting mechanism, and reflected light enters the inside of the light collecting mechanism through the through hole;A photoelectric conversion mechanism is connected to the input end of the light collecting mechanism, and the photoelectric conversion mechanism is used for converting the reflected light entering the light collecting mechanism into an electric signal;Wherein, the photoelectric conversion mechanism comprises a light splitting component and a conversion component, the light splitting component is used for dividing the reflected light into different light beams according to wavelength range, and the conversion component converts each light beam into a corresponding electric signal.

[0006] Further, the photoelectric conversion mechanism further comprises a shell, the light splitting component comprises a first light splitting mirror group, a second light splitting mirror group and a third light splitting mirror group, and the first light splitting mirror group, the second light splitting mirror group and the third light splitting mirror group are sequentially arranged in parallel along the height direction of the shell according to wavelength range from low to high.

[0007] Further, the photoelectric conversion mechanism further comprises a focusing component, and the light splitting component, the focusing component and the conversion component are sequentially arranged in the shell according to the transmission direction of the reflected light.

[0008] Further, the first light splitting mirror group, the second light splitting mirror group and the third light splitting mirror group each comprise a first mounting plate, a second mounting plate and a light splitting lens, the first mounting plate is provided with a mounting position, the second mounting plate is arranged on the mounting position, and the refractive indexes of the light splitting lenses of the first light splitting mirror group, the second light splitting mirror group and the third light splitting mirror group are different.

[0009] Further, the focusing assembly comprises a first focusing lens group, a second focusing lens group and a third focusing lens group, the first focusing lens group, the second focusing lens group and the third focusing lens group are sequentially arranged along the height direction of the shell, and the first focusing lens group, the second focusing lens group and the third focusing lens group correspond to the first filter lens group, the second filter lens group and the third filter lens group one by one.

[0010] Further, the photoelectric conversion mechanism further comprises a filter assembly, and the light splitting assembly, the focusing assembly, the filter assembly and the conversion assembly are sequentially arranged in the shell in the transmission direction of reflected light.

[0011] Further, the filter assembly comprises a first filter lens group, a second filter lens group and a third filter lens group, the first filter lens group, the second filter lens group and the third filter lens group are sequentially arranged along the height direction of the shell, and the first focusing lens group, the second focusing lens group and the third focusing lens group correspond to the first filter lens group, the second filter lens group and the third filter lens group one by one.

[0012] Further, the light collecting mechanism comprises a mirror seat and a mirror group, the mirror group is installed on the mirror seat, the through hole is arranged on the mirror seat, and the output end of the mirror seat is connected with the input end of the conversion assembly.

[0013] Further, the mirror group comprises a fixed frame and a mirror piece, the fixed frame is installed on the mirror seat, and the mirror piece is installed in the fixed frame.

[0014] The utility model discloses further provide a kind of laser welding equipment, including the laser welding monitoring device as described above.

[0015] The utility model has the beneficial effects of:

[0016] Compared with the prior art, the laser welding monitoring device provided by the utility model collects and transmits the reflected light generated in the laser welding process to the photoelectric conversion mechanism, the photoelectric conversion mechanism converts the reflected light entering the light collecting mechanism into an electrical signal, realizes real-time monitoring of the welding process, the light splitting assembly decomposes the reflected light into light beams of different wavelengths according to the wavelength range, and the conversion assembly converts each light beam into a corresponding electrical signal to identify defects in the weld, thereby improving the welding quality of the workpiece.

[0017] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, it can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A kind of laser welding monitoring device overall structure schematic view is proposed for the utility model;

[0019] Figure 2 A kind of laser welding monitoring device in the section structure schematic view of photoelectric conversion mechanism is proposed for the utility model;

[0020] Figure 3 A kind of laser welding monitoring device in the exploded structure schematic view of first beam splitter group is proposed for the utility model;

[0021] Figure 4 A kind of laser welding monitoring device in the section structure schematic view of light collecting mechanism is proposed for the utility model;

[0022] Figure 5 A kind of laser welding monitoring device in the section structure schematic view of reflector group is proposed for the utility model.

[0023] Explanation of reference signs:

[0024] 1, light collecting mechanism;11, mirror seat;111, through hole;12, reflector group;121, fixed frame;122, reflector lens;2, photoelectric conversion mechanism;21, shell;22, beam splitting component;221, first beam splitter group;2211, first mounting plate;2212, second mounting plate;2213, beam splitter lens;2214, mounting position;2215, gasket;2216, positioning bead;222, second beam splitter group;223, third beam splitter group;23, focusing component;231, first focusing mirror group;232, second focusing mirror group;233, third focusing mirror group;24, light filtering component;241, first light filtering mirror group;242, second light filtering mirror group;243, third light filtering mirror group;25, conversion component. Specific implementation

[0025] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model will be further described in detail below with the help of the drawings and specific implementation.

[0026] The technical scheme in the embodiments of the utility model will be described clearly and completely below with the help of the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the utility model.

[0027] In the description of the utility model, it is understood that the directions or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are the directions or positional relationships described based on the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0028] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0029] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0030] In the utility model, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or the indirect contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and oblique above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical direction of the first feature below and oblique below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0031] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0032] Please refer to Figures 1 to 5 The utility model provides a kind of laser welding monitoring device, comprising: light collecting mechanism 1, light collecting mechanism 1 is equipped with through hole 111, reflected light passes through through hole 111 and enters the inside of light collecting mechanism 1;Photoelectric conversion mechanism 2, light collecting mechanism 1 is connected to the input end of photoelectric conversion mechanism 2, photoelectric conversion mechanism 2 is used to convert the reflected light entering light collecting mechanism 1 into electrical signal;Wherein, photoelectric conversion mechanism 2 includes light splitting component 22 and conversion component 25, light splitting component 22 is used to divide reflected light into different beams according to wavelength range, and conversion component 25 converts each beam into corresponding electrical signal.

[0033] In actual application process, laser welding machine emits laser beam to workpiece for welding. At the same time, light collecting mechanism 1 receives reflected light from welding area through through hole 111, and light collecting mechanism 1 transmits reflected light to photoelectric conversion mechanism 2, since the light waves generated by different types of defects are different, light splitting component 22 decomposes reflected light into light beams of different wavelengths according to wavelength range, which can accurately identify different types of defects existing in weld, and conversion component 25 converts these light beams into corresponding electrical signals and outputs externally. Since the intensity, frequency and other parameters of electrical signal are related to the brightness, wavelength and other characteristics of light beam, so as to reflect the actual situation of weld, when electrical signal is processed and analyzed externally, the quality information of weld can be obtained.

[0034] In the embodiment, conversion component 25 includes a plurality of photoelectric sensors, and the sensing spectral segments of different photoelectric sensors are different.

[0035] The laser welding monitoring device provided in the embodiment collects and transmits reflected light generated in laser welding process to photoelectric conversion mechanism 2 through light collecting mechanism 1, photoelectric conversion mechanism 2 converts reflected light entering light collecting mechanism 1 into electrical signal, realizes real-time monitoring of welding process, light splitting component 22 decomposes reflected light into light beams of different wavelengths according to wavelength range, and conversion component 25 converts each light beam into corresponding electrical signal, to identify defects existing in weld, and improve the welding quality of workpiece.

[0036] Please refer to Figure 2 The photoelectric conversion mechanism 2 further comprises a housing 21, and the light splitting assembly 22 comprises a first light splitting mirror set 221, a second light splitting mirror set 222, and a third light splitting mirror set 223, which are arranged in parallel along the length direction of the housing 21 in order of low to high wavelength range.

[0037] Specifically, the first light splitting mirror set 221, the second light splitting mirror set 222, and the third light splitting mirror set 223 are arranged at an angle of 45° with the horizontal plane, so that the incidence angle and the emission angle of the reflected light on the first light splitting mirror set 221, the second light splitting mirror set 222, and the third light splitting mirror set 223 are equal, the consistency of the light propagation direction is maintained, and the optical loss is reduced. The first light splitting mirror set 221 can reflect the reflected light with a wavelength of 400 to 800 nm, and the reflected light with a wavelength of 900 to 1800 nm is transmitted through the first light splitting mirror set 221 to the second light splitting mirror set 222. The second light splitting mirror set 222 can reflect the reflected light with a wavelength of 900 to 1100 nm, and the reflected light with a wavelength of 1200 to 1800 nm is transmitted through the second light splitting mirror set 222 to the third light splitting mirror set 223. The third light splitting mirror set 223 reflects the reflected light with a wavelength of 1200 to 1800 nm. In this way, the wavelength separation of the reflected light is realized, and the defects generated in the welding process can be accurately identified.

[0038] Please refer to Figure 3 The first light splitting mirror set 221, the second light splitting mirror set 222, and the third light splitting mirror set 223 each comprise a first mounting plate 2211, a second mounting plate 2212, and a light splitting mirror 2213. The first mounting plate 2211 is provided with a mounting position 2214, the second mounting plate 2212 mounts the light splitting mirror 2213 on the mounting position 2214, and the refractive indexes of the light splitting mirrors 2213 of the first light splitting mirror set 221, the second light splitting mirror set 222, and the third light splitting mirror set 223 are different.

[0039] Specifically, the beamsplitter plate 2213 of the first beamsplitter group 221 can reflect the reflected light with a wavelength of 400-800 nm, and the reflected light with a wavelength of 900-1800 nm can pass through the beamsplitter plate 2213 of the first beamsplitter group 221 to the second beamsplitter group 222, the beamsplitter plate of the second beamsplitter group 222 can reflect the reflected light with a wavelength of 900-1100 nm, and the reflected light with a wavelength of 1200-1800 nm can pass through the beamsplitter plate of the second beamsplitter group 222 to the third beamsplitter group 223, and the beamsplitter plate of the third beamsplitter group 223 reflects the reflected light with a wavelength of 1200-1800 nm. By using the beamsplitter plates with different refractive indexes, the separation and transmission efficiency of the reflected light in different wavelength ranges are improved, and the monitoring accuracy is enhanced. The first beamsplitter group 221, the second beamsplitter group 222, and the third beamsplitter group 223 further include a plurality of positioning beads 2216 and a gasket 2215. The positioning beads 2216 are installed on the first arrangement plate, so that the first beamsplitter group 221, the second beamsplitter group 222, and the third beamsplitter group 223 are installed in the shell 21. The gasket 2215 is installed on the mounting position 2214, and the beamsplitter plate 2213 is in contact with the gasket 2215. Since the gasket 2215 has elasticity or plasticity, it can absorb the deformation caused by assembly stress or temperature change, so that the beamsplitter plate 2213 is stably fixed on the mounting position 2214.

[0040] Referring to Figure 2 The photoelectric conversion mechanism 2 further includes a focusing assembly 23. The beamsplitting assembly 22, the focusing assembly 23, and the conversion assembly 25 are sequentially arranged in the shell 21 according to the transmission direction of the reflected light.

[0041] Specifically, after the wavelength separation of the reflected light by the beamsplitting assembly 22, the light beams with different wavelengths are transmitted to the focusing assembly 23. The focusing assembly 23 focuses the light beams, so that the size of the light spot is reduced and the light intensity is increased. At the same time, the loss and interference of the light energy are reduced, and the accuracy and stability of the laser welding monitoring are improved. The beamsplitting assembly 22, the focusing assembly 23, and the conversion assembly 25 are sequentially arranged in the shell 21 according to the transmission direction of the reflected light, and the spatial layout is optimized.

[0042] Referring to Figure 2 The focusing assembly 23 includes a first focusing mirror group 231, a second focusing mirror group 232, and a third focusing mirror group 233. The first focusing mirror group 231, the second focusing mirror group 232, and the third focusing mirror group 233 are sequentially arranged along the height direction of the shell 21. The first beamsplitter group 221, the second beamsplitter group 222, and the third beamsplitter group 223 are correspondingly arranged with the first focusing mirror group 231, the second focusing mirror group 232, and the third focusing mirror group 233, so that the light emitted by the first beamsplitter group 221, the second beamsplitter group 222, and the third beamsplitter group 223 is respectively transmitted to the first focusing mirror group 231, the second focusing mirror group 232, and the third focusing mirror group 233.

[0043] Specifically, the first light splitting mirror set 221 reflects the reflected light with a wavelength of 400-800nm to the first focusing lens set 231 for focusing, and the focused light beam is transmitted to the conversion assembly 25 for conversion into an electrical signal; the reflected light after the first light splitting is transmitted to the second light splitting mirror set 222, and the second light splitting mirror set 222 transmits the reflected light with a wavelength of 900-1100nm to the second focusing lens set 232 for focusing, and the focused light beam is transmitted to the conversion assembly 25 for conversion into an electrical signal; the reflected light after the second light splitting is transmitted to the third light splitting mirror set 223, and the third light splitting mirror set 223 transmits the reflected light with a wavelength of 1200-1800nm to the third focusing lens set 233 for focusing, and the focused light beam is transmitted to the photoelectric conversion assembly 25 for conversion into an electrical signal. In this way, three-stage light splitting and focusing are realized, the light intensity reaching the photoelectric conversion assembly 25 is improved, and thus the monitoring sensitivity is improved.

[0044] Please refer again to Figure 2 , the photoelectric conversion mechanism 2 further comprises a light filtering assembly 24, and the light splitting assembly 22, the focusing assembly 23, the light filtering assembly 24 and the conversion assembly 25 are sequentially arranged in the shell 21 in the transmission direction of the reflected light.

[0045] Specifically, the focused light beam enters the light filtering assembly 24, and the light filtering assembly 24 filters the light beam to retain light rays of a specific wavelength. Under the action of the light splitting assembly 22, the focusing assembly 23 and the light filtering assembly 24, the reflected light is accurately processed and converted, and the monitoring accuracy and sensitivity are improved.

[0046] Please refer again to Figure 2 , the light filtering assembly 24 comprises a first light filtering mirror set 241, a second light filtering mirror set 242 and a third light filtering mirror set 243, the first light filtering mirror set 241, the second light filtering mirror set 242 and the third light filtering mirror set 243 are sequentially arranged along the length direction of the shell 21, and the first focusing lens set 231, the second focusing lens set 232 and the third focusing lens set 233 correspond to the first light filtering mirror set 241, the second light filtering mirror set 242 and the third light filtering mirror set 243 one by one, so that the light emitted by the first focusing lens set 231, the second focusing lens set 232 and the third focusing lens set 233 is respectively transmitted to the first light filtering mirror set 241, the second light filtering mirror set 242 and the third light filtering mirror set 243.

[0047] Specifically, the first light splitting mirror set 221 reflects the reflected light with a wavelength of 400-800nm to the first focusing lens set 231 for focusing, and the focused light beam is transmitted to the first filter lens set 241 for filtering, and the filtered light beam is transmitted to the photoelectric conversion assembly 25 for conversion into an electrical signal; the reflected light after the first light splitting is transmitted to the second light splitting mirror set 222, the second light splitting mirror set 222 transmits the reflected light with a wavelength of 900-1100nm to the second focusing lens set 232 for focusing, and the focused light beam is transmitted to the second filter lens set 242 for filtering, and the filtered light beam is transmitted to the photoelectric conversion assembly 25 for conversion into an electrical signal; the reflected light after the second light splitting is transmitted to the third light splitting mirror set 223, the third light splitting mirror set 223 transmits the reflected light with a wavelength of 1200-1800nm to the third focusing lens set 233 for focusing, and the focused light beam is transmitted to the third filter lens set 243 for filtering, and the filtered light beam is transmitted to the photoelectric conversion assembly 25 for conversion into an electrical signal, thereby realizing the processing and screening of the reflected light with different wavelengths and improving the monitoring precision and sensitivity.

[0048] Referring to Figure 4 , the light collecting mechanism 1 comprises a mirror seat 11 and a mirror set 12, the mirror set 12 is installed on the mirror seat 11, a through hole 111 is arranged on the mirror seat 11, and the output end of the mirror seat 11 is connected with the input end of the conversion assembly 25.

[0049] Specifically, the reflected light generated in the laser welding process enters the light collecting mechanism 1 through the through hole 111, and the mirror set 12 reflects and guides the reflected light, so that the reflected light is transmitted to the output end of the mirror seat 11. The mirror set 12 is arranged at an angle of 45° with the horizontal plane, thereby improving the collection efficiency of the reflected light and enabling more reflected light to be collected, and improving the monitoring precision.

[0050] Referring to Figure 5 , the mirror set 12 comprises a fixed frame 121 and a mirror piece 122, the fixed frame 121 is installed on the mirror seat 11, and the mirror piece 122 is installed in the fixed frame 121.

[0051] Specifically, the mirror piece 122 is installed on the mirror seat 11 through the fixed frame 121, so that the stability of the mirror piece 122 during the laser welding process can be ensured, and the monitoring error caused by vibration or movement can be avoided, and meanwhile, the installation of the mirror piece 122 in the fixed frame 121 facilitates daily maintenance and replacement.

[0052] The utility model also provides a laser welding equipment, including laser welding monitoring device as described above.

[0053] Specifically, the laser welding monitoring device is applied to the laser welding equipment, so that the beneficial effects of the laser welding equipment and the laser welding monitoring device are the same.

[0054] Compared with the prior art, the laser welding monitoring device provided by the utility model realizes the real-time monitoring of the welding process, the reflected light is decomposed into light beams of different wavelengths by the light splitting assembly 22 according to the wavelength range, the conversion assembly 25 converts each light beam into a corresponding electric signal, defects existing in the weld are identified, and the welding quality of the workpiece is improved.

[0055] The above is only a specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the utility model, and these modifications or replacements should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A laser welding monitoring apparatus characterized by comprising: The application relates to a laser welding monitoring device. The laser welding monitoring device comprises a light collecting mechanism, a photoelectric conversion mechanism and a laser welding monitoring device. The light collecting mechanism is provided with a through hole through which reflected light enters the inside of the light collecting mechanism. The photoelectric conversion mechanism is connected to the input end of the light collecting mechanism and is used for converting the reflected light entering the light collecting mechanism into an electric signal.

2. The laser welding monitoring device of claim 1, wherein, The photoelectric conversion mechanism comprises a light splitting assembly and a conversion assembly.

3. The laser welding monitoring device of claim 2, wherein, The light splitting assembly is used for splitting the reflected light into different light beams according to wavelength ranges.

4. The laser welding monitoring apparatus of claim 2, wherein The conversion assembly converts each light beam into a corresponding electric signal.

5. The laser welding monitoring device of claim 4, wherein, The photoelectric conversion mechanism further comprises a shell.

6. The laser welding monitoring device of claim 5, wherein, The light splitting assembly comprises a first light splitting mirror group, a second light splitting mirror group and a third light splitting mirror group.

7. The laser welding monitoring device of claim 6, wherein, The first light splitting mirror group, the second light splitting mirror group and the third light splitting mirror group are sequentially and parallelly arranged along the height direction of the shell according to wavelength ranges from low to high.

8. The laser welding monitoring apparatus of claim 1, wherein, The first light splitting mirror group, the second light splitting mirror group and the third light splitting mirror group each comprise a first mounting plate, a second mounting plate and a light splitting lens.

9. The laser welding monitoring device of claim 8, wherein, The first mounting plate is provided with a mounting position.

10. A laser welding apparatus characterized by comprising: The second mounting plate mounts the light splitting lens on the mounting position. The refractive indexes of the light splitting lenses of the first light splitting mirror group, the second light splitting mirror group and the third light splitting mirror group are different. The photoelectric conversion mechanism further comprises a focusing assembly. The light splitting assembly, the focusing assembly and the conversion assembly are sequentially arranged in the shell according to the transmission direction of the reflected light. The focusing assembly comprises a first focusing mirror group, a second focusing mirror group and a third focusing mirror group. The first focusing mirror group, the second focusing mirror group and the third focusing mirror group are sequentially arranged along the height direction of the shell. The first focusing mirror group, the second focusing mirror group and the third focusing mirror group correspond to the first light splitting mirror group, the second light splitting mirror group and the third light splitting mirror group one by one. The photoelectric conversion mechanism further comprises a light filtering assembly. The light filtering assembly comprises a first light filtering mirror group, a second light filtering mirror group and a third light filtering mirror group. The first light filtering mirror group, the second light filtering mirror group and the third light filtering mirror group are sequentially arranged along the height direction of the shell. The first light filtering mirror group, the second light filtering mirror group and the third light filtering mirror group correspond to the first focusing mirror group, the second focusing mirror group and the third focusing mirror group one by one. The light collecting mechanism comprises a mirror seat and a mirror group. The through hole is arranged on the mirror seat. The output end of the mirror seat is connected to the input end of the conversion assembly. The mirror group comprises a fixed frame and a mirror lens. The fixed frame is mounted on the mirror seat. The mirror lens is mounted in the fixed frame. The laser welding monitoring device comprises the laser welding monitoring device according to any one of claims 1-9.

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