Detection device and laser cutting system

Abstract

This invention belongs to the field of laser processing technology and discloses a detection device and a laser cutting system. The detection device, located on the laser cutting head, monitors the status of the laser-cut workpiece and includes a housing, a perforation assembly, a process monitoring assembly, and a camera assembly. The housing houses a light-inlet assembly and a control board, allowing the total beam of light to enter the light-inlet assembly. The perforation assembly includes a first detection board capable of sensing a first split beam of light. The process monitoring assembly includes a second detection board capable of sensing a second split beam of light. The camera assembly includes a camera capable of acquiring images of the laser-cut workpiece. The control board is electrically connected to the first detection board, the camera, and the second detection board. Both the first and second split beams are formed by separating the total beam of light. The laser cutting system includes a double-cemented mirror and the detection device, with light passing through the double-cemented mirror to form the total beam of light. This invention enables monitoring of the laser processing status, identification of abnormal states, and assistance in improving the processing quality of the laser cutting system.

Description

Technical Field

[0001] This invention relates to the field of laser processing technology, and more particularly to a detection device and a laser cutting system. Background Technology

[0002] In recent years, with the development of vision technology, machine vision application technology has gradually penetrated into industrial production.

[0003] In the field of laser cutting, the laser beam emitted by a fiber laser passes through the collimating and focusing lenses of the laser cutting head to form a high-energy focused spot that irradiates the surface of a metal sheet to cut it. To obtain a better cut surface quality, cutting gas is usually added during the cutting process. This gas flows out of the cutting nozzle to purge the molten metal in the weld pool at the cut edge, allowing it to detach from the kerf.

[0004] In actual cutting processes, traditional laser cutting heads often encounter the following problems:

[0005] (1) When a high-power laser beam irradiates the focusing lens of the cutting head for a long time, the temperature rise of the lens will change the curvature of its surface contour, which will cause the focus of the cutting head to shift, resulting in a reduction in cutting quality.

[0006] (2) When the laser beam deviates from the center of the nozzle, the cutting gas and the laser beam are no longer coaxial, and the purging of the cutting pool by the cutting gas is no longer symmetrical, which will also lead to a decrease in cutting quality.

[0007] (3) During operation, the laser cutting head may collide or scrape due to the operator's negligence, which may cause the cutting nozzle to tilt, thereby affecting the laser beam or cutting gas and resulting in a decrease in cutting quality.

[0008] (4) Because a large amount of smoke and metal particles are generated during the laser cutting process, long-term cutting may clog the nozzle or splash onto the inner wall of the nozzle, which will directly affect the decline in actual cutting quality. Summary of the Invention

[0009] The purpose of this invention is to provide a detection device and a laser cutting system for monitoring the working status of a laser beam, identifying abnormal states, and improving the processing quality of the laser cutting system.

[0010] To achieve this objective, the present invention adopts the following technical solution:

[0011] A detection device, mounted on the laser cutting head, is used to monitor the status of the laser-cut workpiece, including:

[0012] The housing contains a light-gathering component and a control board, and the total beam of light can enter the light-gathering component;

[0013] A perforation assembly, the perforation assembly including a first detection plate, the first detection plate being capable of sensing a first beam of light;

[0014] A camera assembly, including a camera capable of acquiring images of the laser-cut workpiece;

[0015] A process monitoring component, the process monitoring component including a second detection plate, the second detection plate being capable of sensing a second beam of light;

[0016] The perforation assembly, the camera assembly, and the process monitoring assembly are all housed within the housing.

[0017] The control board is electrically connected to the first detection board, the camera, and the second detection board.

[0018] Both the first and second beam splitters are formed by separating from the total beam.

[0019] As an optional solution for the detection device, the perforation assembly further includes a perforation base. The perforation base has a first vertical light-passing hole and a first horizontal light-passing hole connected to the first vertical light-passing hole. The first detection plate is disposed at the end of the first horizontal light-passing hole. The first vertical light-passing hole is connected to the light-inlet channel of the light-inlet assembly. The total beam of light passes through the light-inlet channel and is separated into a first split beam of light and a third split beam of light. The first split beam of light can illuminate the first detection plate through the first horizontal light-passing hole.

[0020] As an optional solution for the detection device, the perforated base is provided with a lens base, which is located between the first horizontal light-transmitting hole and the first detection plate. The lens base is provided with a first filter and a first attenuator in sequence along a first direction. The first beam of light can pass through the first filter and the first attenuator in sequence. The first direction is the propagation direction of the first beam of light.

[0021] As an alternative to the detection device, the perforation assembly further includes a first detection plate base, wherein the first detection plate is disposed on the first detection plate base.

[0022] As an optional solution for the detection device, the process monitoring component further includes a detection base, in which a second vertical light-transmitting hole and a second horizontal light-transmitting hole connected to the second vertical light-transmitting hole are formed. The second detection plate is located at the end of the second horizontal light-transmitting hole. A first beam splitter is provided between the second vertical light-transmitting hole and the first vertical light-transmitting hole. The total beam of light passes through the first beam splitter to form a first beam splitter and a third beam splitter. The third beam splitter separates the second beam splitter, and the second beam splitter passes through the second horizontal light-transmitting hole and illuminates the second detection plate.

[0023] As an optional solution for the detection device, a second beam splitter is also embedded in the detection base. The third beam splitter separates the second beam splitter into a second beam splitter and a fourth beam splitter, and the fourth beam splitter can be projected into the camera.

[0024] As an optional embodiment of the detection device, the detection device further includes a filter assembly, which includes a filter base and a second filter disposed within the filter base. The fourth beam of light can pass through the second filter to form a fifth beam of light, and the fifth beam of light can enter the camera.

[0025] As an alternative to the detection device, the detection device further includes a reflector assembly, which includes two symmetrically and tilted reflectors, through which the fifth beam of light is reflected sequentially into the camera.

[0026] As an optional solution for the detection device, the housing is provided with a light inlet hole, through which the total beam of light enters the light inlet component.

[0027] A laser cutting system includes a laser cutting head, the laser cutting head being equipped with a double cemented mirror, and a detection device as described in any of the above embodiments. The light generated by the laser cutting head cutting the workpiece is passed through the double cemented mirror to form the total beam of light.

[0028] Beneficial effects:

[0029] In this invention, a laser cutting head emits a laser beam to irradiate the surface of a workpiece, cutting the workpiece along a predetermined path. During the laser cutting process, bright sparks are generated on the surface of the workpiece. The light from these sparks converges to form a total beam, which enters the detection device. The device senses and collects the first and second split beams separated from the total beam, and further acquires images of the laser-cut workpiece using a camera. This enables the detection and monitoring of the laser cutting process, allowing the operator to perform appropriate subsequent operations based on the detection results. This ensures timely detection of any abnormalities in the laser cutting process, thereby improving the quality of laser cutting. Specifically, the first split beam formed by separating the total beam enters the first detection plate; the second... The split beam of light enters the second detection plate, and the first and second detection plates can detect beams of different wavelengths to identify the cutting status. A camera can also be used to photograph the kerf on the cutting surface. By observing the changes in the weld width displayed in the captured image, it can be determined whether the laser focus emitted by the cutting head forms a closed loop and whether the kerf width is maintained. In addition, when the laser and nozzle are not aligned, or when there are contaminants on the nozzle or when it is scraped or deviated, relevant information can be obtained in a timely manner through the image acquired by the camera, thereby reminding the operator to make subsequent adjustments. The control board is electrically connected to the first detection plate, camera, and second detection plate, which can summarize the detection results from each component and further analyze and transmit them through the control board.

[0030] In this invention, the laser cutting system equipped with this detection device can monitor various abnormal working states in real time, allowing operators to adjust subsequent operations in a timely manner and ensuring the stability of laser cutting quality. Attached Figure Description

[0031] Figure 1 This is an isometric view of the detection device provided in the embodiment of the present invention from a first perspective;

[0032] Figure 2 This is an isometric view of the detection device provided in the embodiment of the present invention from a second perspective;

[0033] Figure 3 This is a front view of the detection device for hiding the top cover provided in an embodiment of the present invention;

[0034] Figure 4 This is a cross-sectional schematic diagram of the detection device provided in an embodiment of the present invention;

[0035] Figure 5 yes Figure 4 A magnified view of a portion at point A;

[0036] Figure 6 This is a partial cross-sectional schematic diagram of the light-gathering component and the process monitoring component provided in an embodiment of the present invention;

[0037] Figure 7 This is a front view of the reflector assembly provided in an embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the optical path provided in an embodiment of the present invention.

[0039] In the picture:

[0040] 1. Housing; 11. Light-inlet assembly; 110. Light-inlet base; 111. Light-inlet channel; 112. Reflector; 12. Control board; 13. Light-inlet hole; 14. Base; 15. Top cover; 16. Wiring hole; 17. Terminal block; 18. Fixing hole; 19. Sealing ring;

[0041] 2. Perforation assembly; 21. First detection plate; 22. Perforation base; 221. First vertical light-transmitting hole; 222. First horizontal light-transmitting hole; 23. Lens base; 231. First filter; 232. First attenuator; 24. First detection plate base;

[0042] 3. Camera components; 31. Camera;

[0043] 4. Process monitoring component; 41. Second detection plate; 42. Detection base; 421. Second vertical light transmission hole; 422. Second horizontal light transmission hole;

[0044] 5. First beam splitter;

[0045] 6. Second beam splitter;

[0046] 7. Total beam; 71. First beam; 72. Second beam; 73. Third beam; 74. Fourth beam; 75. Fifth beam;

[0047] 8. Filter assembly; 81. Filter base; 82. Second filter;

[0048] 9. Reflector assembly; 91. Reflector;

[0049] 100. Cemented doublet lens. Detailed Implementation

[0050] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0051] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0054] Please see the appendix Figure 1 -Appendix Figure 8 One aspect of this embodiment relates to a detection device disposed on a laser cutting head for monitoring the state of a laser-cut workpiece. The device includes: a housing 1, a perforation assembly 2, a camera assembly 3, and a process monitoring assembly 4. The housing 1 contains a light-inlet assembly 11 and a control board 12, and the total beam of light 7 can enter the light-inlet assembly 11. The perforation assembly 2 includes a first detection plate 21 that can sense a first split beam of light 71. The camera assembly 3 includes a camera 31 that can acquire images of the laser-cut workpiece. The process monitoring assembly 4 includes a second detection plate 41 that can sense a second split beam of light 72. The perforation assembly 2, camera assembly 3, and process monitoring assembly 4 are all disposed within the housing 1. The control board 12 is electrically connected to the first detection plate 21, the camera 31, and the second detection plate 41. The first split beam of light 71 and the second split beam of light 72 are both formed by separation from the total beam of light 7.

[0055] In this embodiment, the laser cutting head emits a laser beam to irradiate the surface of the workpiece. The laser cuts the workpiece along a predetermined path. During the laser cutting process, bright sparks are generated on the surface of the workpiece. The light generated by the sparks converges to form a main beam 7, which enters the detection device. The first and second beams 71, separated from the main beam 7, are sensed and collected. Furthermore, an image of the laser-cut workpiece is acquired by a camera 31, realizing the status detection and monitoring of the laser cutting process. This allows the operator to perform corresponding subsequent operations based on the detection results, ensuring timely detection of abnormal laser cutting conditions and thus improving the quality of laser cutting. Specifically, the first beam 71, formed by separating the main beam 7, enters the first detection plate 21; the second beam 72 enters the second detection plate. 41. The cutting state can be identified by detecting visible light of different wavelengths set by the first detection plate 21 and the second detection plate 41 respectively. For example, when using a laser to pierce a workpiece, if the visible light projected onto the first detection plate 21 is A1nm, then the first detection plate 21 is set to be able to detect visible light of A1nm. That is, when the first detection plate 21 detects visible light of A1nm, it can be proven that the laser cannot cut through the workpiece at this time, and the piercing operation needs to continue. When using a laser to continuously cut a workpiece, if the beam wavelength projected onto the second detection plate 41 is A2nm, then the second detection plate 41 is set to be able to detect beams of A2nm. That is, when the second detection plate 41 detects beams of A2nm, it can be proven that the workpiece has not been cut through in the current state, and it is necessary to back up a certain distance and cut again. When a high-power laser beam irradiates the focusing lens of the cutting head for an extended period, the temperature rise of the focusing lens will change the curvature of its surface contour, leading to a shift in the cutting head's focus. In this case, camera 31 can be used to detect the cutting kerf on the workpiece surface in real time to determine if the laser focus of the cutting head has shifted. If a shift occurs, the system controls and adjusts the cutting head's focus to achieve focus compensation, ensuring a constant kerf width. Furthermore, if the laser and nozzle are not aligned, or if there are contaminants on the nozzle or if it is subject to friction or shift, relevant information can be obtained from the image acquired by camera 31, prompting the operator to make subsequent adjustments. Control board 12 is electrically connected to the first detection board 21, camera 31, and second detection board 41. It not only supplies power to the first and second detection boards 21 and 41 but also aggregates the detection results from each component and further analyzes and transmits them through control board 12.

[0056] Optionally, the control board 12 is connected to a host computer. By sending the detection results to the control board 12, further performing calculations on the control board 12, and outputting the results to the host computer, the host computer issues execution commands based on the detection results to control the laser cutting head, thereby achieving control feedback.

[0057] As a preferred option, the control board 12 is the main control PCB board.

[0058] Optionally, the first detection board 21 and the second detection board 41 are PCB boards capable of detecting visible light in the corresponding wavelength band.

[0059] Because the detection device has a multi-component collaborative detection function, the total beam 7 needs to be split proportionally as needed to form the first beam 71 and the second beam 72.

[0060] Optionally, the housing 1 is provided with a light inlet hole 13, through which the total beam of light 7 enters the light-attracting assembly 11. In this embodiment, the housing 1 includes a base 14 and a top cover 15, which are fastened together to form an integral housing 1. A light inlet hole 13 is provided on the base 14, through which the total beam of light 7 enters the light-attracting assembly 11.

[0061] Optionally, the base 14 is provided with fixing holes 18, through which the entire detection device is fixed to the laser cutting head. Specifically, a threaded fastener can be passed through the fixing hole 18 and connected to the laser cutting head. In this embodiment, four fixing holes 18 are provided, and those skilled in the art can adjust the number of fixing holes 18 as needed.

[0062] Optionally, the top of the base 14 is also provided with a wiring terminal 17 for transmitting image data acquired by the camera 31. Optionally, a sealing ring 19 is provided between the base 14 and the top cover 15 to prevent impurities and moisture from entering the detection device.

[0063] Optionally, a wire-through hole 16 is provided on the base 14. One end of the lead wire is connected to the control board 12 through the wire-through hole 16, and the other end passes through the wire-through hole 16 to connect to the host computer.

[0064] Optionally, the light-gathering assembly 11 includes a light-gathering base 110, inside which a reflector 112 is provided. The total beam of light 7 can be irradiated onto the reflector 112 through the light-gathering aperture 13 and reflected by the reflector 112, thereby changing the incident direction of the total beam of light 7. In this embodiment, the reflector 112 is set at 45° to the vertical plane, which can transform the horizontally incident total beam of light 7 into vertically incident light through the reflector 112. The reflector 112 is embedded in the cavity inside the light-gathering base 110, and the light-gathering aperture 13 is completely enclosed inside the light-gathering base 110 to avoid light loss of the total beam of light 7 during the incident process.

[0065] Optionally, an opening is provided on the base, and a threaded fastener passes through the opening and connects to the light-inlet base 110, so that the light-inlet base 110 is fixed inside the housing 1. A connecting groove is provided at the bottom of the light-inlet base 110, which can facilitate the fixing of the reflector 112. After the reflector 112 is assembled, the connecting groove is closed by using a mounting plate.

[0066] Optionally, the perforated assembly 2 further includes a perforated base 22, which has a first vertical light-passing hole 221 and a first horizontal light-passing hole 222 connected to the first vertical light-passing hole 221. The first detection plate 21 is located at the end of the first horizontal light-passing hole 222. The first vertical light-passing hole 221 is connected to the light-passing channel 111 of the light-passing assembly 11. The total beam of light 7 passes through the light-passing channel 111 and is separated into a first beam of light 71 and a third beam of light 73. The first beam of light 71 can shine on the first detection plate 21 through the first horizontal light-passing hole 222.

[0067] In this embodiment, the perforated base 22 is L-shaped, and its bottom is screwed to the top of the light-incoming base 110. Specifically, the perforated base 22 has a base connection hole, and the top of the light-incoming base 110 has a base threaded hole. A bolt with an elastic washer passes through the base connection hole and is screwed to the base threaded hole. Inside the perforated base 22, there is a first vertical light-passing hole 221 and a first horizontal light-passing hole 222 connected to the first vertical light-passing hole 221. The first vertical light-passing hole 221 is connected to the light-incoming channel 111 of the light-incoming component 11. The total beam of light 7 first passes through the light-incoming channel 111 and is separated to form a first beam splitter 71 and a third beam splitter 73. The first beam splitter 71 illuminates the first detection plate 21 through the first horizontal light-passing hole 222 and can be detected by the first detection plate 21.

[0068] The perforated base 22 can further change the direction of light propagation, making it easier to lay out the first detection plate 21 and making the structure of the entire detection device more compact.

[0069] Furthermore, a lens base 23 is provided inside the perforated base 22. The lens base 23 is located between the first horizontal light-transmitting hole 222 and the first detection plate 21. The lens base 23 is provided with a first filter 231 and a first attenuator 232 in sequence along the first direction. The first beam splitter 71 can pass through the first filter 231 and the first attenuator 232 in sequence. By setting the first filter 231, the first beam 71 can be filtered to remove visible light in the interference band, so that the beam that can be accurately identified by the first detection plate 21 is projected onto the first detection plate 21. In addition, the first attenuator 232 can reduce the light intensity of the first beam 71, so as to avoid the light from the laser processing workpiece being too strong and exceeding the light intensity range of the first detection plate 21, which would burn out the photosensitive element on the first detection plate 21. Furthermore, by integrating the first attenuator 232 and the first filter 231 into the same lens base 23, modularization can be easily achieved, which is convenient for assembly. The first direction is the propagation direction of the first beam 71.

[0070] Optionally, the perforation assembly 2 further includes a first detection plate base 24, on which the first detection plate 21 is disposed. The first detection plate base 24 is screwed to the perforation base 22 to ensure reliable fixation of the first detection plate base 24 and to facilitate adjustment of the distance between the first detection plate 21 and the perforation base 22.

[0071] Optionally, the process monitoring component 4 further includes a detection base 42, which has a second vertical light-transmitting hole 421 and a second horizontal light-transmitting hole 422 connected to the second vertical light-transmitting hole 421. The second detection plate 41 is located at the end of the second horizontal light-transmitting hole 422. A first beam splitter 5 is provided between the second vertical light-transmitting hole 421 and the first vertical light-transmitting hole 221. The total beam 7 passes through the first beam splitter 5 to form a first beam splitter 71 and a third beam splitter 73. The third beam splitter 73 separates into a second beam splitter 72. The second beam splitter 72 passes through the second horizontal light-transmitting hole 422 and illuminates the second detection plate 41.

[0072] In this embodiment, the first beam splitter 5 can divide the total beam 7 into a first beam 71 and a third beam 73 according to a certain ratio. The third beam 73 is then separated into a second beam 72, which illuminates the second detection plate 41.

[0073] The process monitoring component 4 is located above the perforation component 2, and the structure of the process monitoring component 4 is basically the same as that of the perforation component 2. The specific connection form and structural style will not be described in detail. The difference between the two is that the first detection plate 21 and the second detection plate 41 can sense different wavelengths of visible light, thereby expanding the detection range of this detection device.

[0074] Optionally, a second beam splitter 6 is also embedded in the detection base 42. The third beam splitter 73 is separated into a second beam splitter 72 and a fourth beam splitter 74 by the second beam splitter 6. The fourth beam splitter 74 can be projected into the camera 31.

[0075] In this embodiment, the second beam splitter 6 separates the third beam splitter 73 into the second beam splitter 72 and the fourth beam splitter 74, and the fourth beam splitter 74 is projected into the camera 31 to form a captured image.

[0076] Optionally, the detection device further includes a filter assembly 8, which includes a filter base 81 and a second filter 82 disposed within the filter base 81. The fourth beam 74 can pass through the second filter 82 to form a fifth beam 75, which can enter the camera 31. In this embodiment, the filter base 81 is screwed to the detection base 42. Through the second filter 82 disposed on the filter base 81, visible light with interfering wavelengths in the fourth beam 74 can be filtered out, separating the fifth beam 75, which is then received by the camera 31.

[0077] Optionally, the detection device also includes a reflector assembly 9, which includes two symmetrically and tilted reflectors 91, through which the fifth beam 75 is reflected sequentially into the camera 31.

[0078] In this embodiment, the reflector assembly 9 is disposed above the filter base 81 and connected to the base 14. The fifth beam 75 first arrives at the first reflector 91 in a vertical direction. The first reflector 91 is at a 45° angle to the vertical plane. Therefore, the direction of the fifth beam 75 after being reflected by the first reflector 91 is adjusted from vertically upward to horizontal. Then, through the second reflector 91, which is symmetrical to the first reflector 91, the fifth beam 75 is made to remain vertical again. However, at this time, the direction of the fifth beam 75 has been adjusted to vertically downward. At this time, the fifth beam 75 enters the camera 31 in a vertically downward direction.

[0079] The propagation direction of the fifth beam 75 is changed by the double reflection of the mirror assembly 9, which optimizes the layout of the camera 31 and makes the structure of the entire detection device more compact.

[0080] Another aspect of this embodiment relates to a laser cutting system, which includes a laser cutting head and the above-mentioned detection device. The laser cutting head is provided with a double-cemented mirror 100, and the light generated by the laser cutting head cutting the workpiece is formed into a total beam 7 by the double-cemented mirror 100. The double-cemented mirror 100 can focus the light from the sparks generated by the laser cutting of the workpiece into a total beam 7 that can enter the detection device.

[0081] Please refer to the appendix for further details. Figure 8 This is a working optical path principle model of the detection device. In the entire optical path model, the beam before the cemented doublet 100 is the object-side beam, and the beam after the cemented doublet 100 is the total beam 7. The total beam 7 is split into a first beam 71, a second beam 72, and a fourth beam 74 by the action of beam splitters 5 and 6. The object-side beam propagates from the nozzle to the cemented doublet 100, and the optical path length of this segment is the object distance L0. The image-side beam propagates from the cemented doublet 100 to the camera 31, and the optical path length of this segment is the image distance L1. The following relationship applies when the two satisfy:

[0082] 1 / L0 + 1 / L1 = 1 / f (f is the focal length of a cemented doublet lens of 100°) (1)

[0083] Only images captured by camera 31 can meet the requirements for clarity.

[0084] For example, when a high-power laser beam irradiates the focusing lens of the laser cutting head for a long time, the temperature rise of the focusing lens will change the curvature of its surface contour, thereby causing the focus of the cutting head to shift and the kerf width to change. At this time, the image captured by the camera 31 of the detection device can extract relevant features to discover the change in kerf width, and then the focus of the laser cutting head is adjusted to form a closed loop to keep the kerf width constant.

[0085] For example, when the laser beam deviates from the center of the nozzle, or when it collides or scrapes due to the operator's negligence, causing the cutting nozzle to become skewed; or when a large amount of smoke and metal particles are generated during the laser cutting process, prolonged cutting may clog the nozzle or splash onto the inner wall of the nozzle, causing the cutting gas and the laser beam to become out of sync, and the purging of the cutting pool by the cutting gas to become asymmetrical, which will also lead to a decrease in cutting quality; at this time, the image captured by camera 31 can be detected in time, reminding the operator to adjust or replace the nozzle.

[0086] For example, the laser cutting head typically performs a perforation operation first. When the laser fails to penetrate the material, the sparks generated by the laser on the surface of the material fly upwards and are quite bright. When the material is penetrated, the laser sparks downwards and are weaker. Therefore, when the first detection plate 21 in the perforation assembly 2 can sense the light, it means that the laser cannot penetrate the material. At this time, the system will control the laser cutting head to continue performing the perforation operation until the material is cut through. When the material is penetrated, if the first detection plate 21 detects light of a specified wavelength, detects no light, or detects a significant decrease in light intensity, the system will issue a command to stop the perforation operation and begin the cutting operation.

[0087] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A detection device, mounted on a laser cutting head, for monitoring the status of a laser-cut workpiece, characterized in that, include: The housing (1) is provided with a light-inlet component (11) and a control board (12) inside the housing (1), and the total beam of light (7) can enter the light-inlet component (11); The perforation assembly (2) includes a first detection plate (21) which can sense a first beam of light (71); The camera assembly (3) includes a camera (31) capable of acquiring images of the laser-cut workpiece; The process monitoring component (4) includes a second detection plate (41) which can sense a second beam of light (72). The perforation assembly (2), the camera assembly (3), and the process monitoring assembly (4) are all housed within the housing (1); The control board (12) is electrically connected to the first detection board (21), the camera (31), and the second detection board (41); The first beam splitter (71) and the second beam splitter (72) are both formed by separating from the total beam (7).

2. The detection device according to claim 1, characterized in that, The perforated assembly (2) further includes a perforated base (22), which has a first vertical light-passing hole (221) and a first horizontal light-passing hole (222) connected to the first vertical light-passing hole (221). The first detection plate (21) is located at the end of the first horizontal light-passing hole (222). The first vertical light-passing hole (221) is connected to the light-passing channel (111) of the light-passing assembly (11). The total beam of light (7) passes through the light-passing channel (111) and is separated to form the first beam of light (71) and the third beam of light (73). The first beam of light (71) can be irradiated onto the first detection plate (21) through the first horizontal light-passing hole (222).

3. The detection device according to claim 2, characterized in that, The perforated base (22) is provided with a lens base (23), which is located between the first horizontal light-transmitting hole (222) and the first detection plate (21). The lens base (23) is provided with a first filter (231) and a first attenuator (232) in sequence along a first direction. The first beam splitter (71) can pass through the first filter (231) and the first attenuator (232) in sequence. The first direction is the propagation direction of the first beam splitter (71).

4. The detection device according to claim 3, characterized in that, The perforation assembly (2) further includes a first detection plate base (24), on which the first detection plate (21) is disposed.

5. The detection device according to claim 4, characterized in that, The process monitoring component (4) further includes a detection base (42), which has a second vertical light-transmitting hole (421) and a second horizontal light-transmitting hole (422) connected to the second vertical light-transmitting hole (421). The second detection plate (41) is located at the end of the second horizontal light-transmitting hole (422). A first beam splitter (5) is provided between the second vertical light-transmitting hole (421) and the first vertical light-transmitting hole (221). The total beam (7) is formed by the first beam splitter (5) into the first beam splitter (71) and the third beam splitter (73). The third beam splitter (73) separates the second beam splitter (72). The second beam splitter (72) passes through the second horizontal light-transmitting hole (422) and illuminates the second detection plate (41).

6. The detection device according to claim 5, characterized in that, The detection base (42) is also embedded with a second beam splitter (6). The third beam splitter (73) is separated into the second beam splitter (72) and the fourth beam splitter (74) by the second beam splitter (6). The fourth beam splitter (74) can be projected into the camera (31).

7. The detection device according to claim 6, characterized in that, The detection device further includes a filter assembly (8), which includes a filter base (81) and a second filter (82) disposed in the filter base (81). The fourth beam (74) can pass through the second filter (82) to form a fifth beam (75), and the fifth beam (75) can enter the camera (31).

8. The detection device according to claim 7, characterized in that, The detection device also includes a reflector assembly (9), which includes two symmetrically and tilted reflectors (91). The fifth beam of light (75) is reflected sequentially by the two reflectors (91) into the camera (31).

9. The detection device according to any one of claims 1-8, characterized in that, The housing (1) is provided with a light inlet hole (13), and the total beam of light (7) enters the light inlet assembly (11) through the light inlet hole (13).

10. A laser cutting system, comprising a laser cutting head, wherein the laser cutting head is provided with a double cemented mirror (100), characterized in that, It also includes the detection device as described in any one of claims 1-9, wherein the light generated by the laser cutting head cutting the workpiece is passed through the double cemented mirror (100) to form the total beam (7).

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