Laser coaxial calibration equipment applied to laser equipment and calibration method thereof

Abstract

The invention discloses laser coaxial calibration equipment applied to laser equipment and a calibration method of the laser coaxial calibration equipment. The laser coaxial calibration equipment comprises a camera module and a core development board, wherein the camera module is used for shooting a nozzle and red light; and the core development board is used for receiving and processing information of the camera module and then judging the relative position of the center of the contour circle of a light through hole of the nozzle and the center of the contour circle of the red light. The whole-process visual operation of laser coaxial operation is carried out through the terminal equipment and the wireless connection equipment thereof, so that the coaxial operation efficiency is higher; the coaxial operation process can be displayed in an operation interface in real time, and repeated naked eye judgment centering and coaxial screw adjustment amplitude control are not needed. Meanwhile, the coaxial precision is more objective and stable; whether coaxiality is in place or not is automatically judged according to the circle center pixel distance of the red light contour circle and the nozzle light through hole contour circle, and manual experience-based judgment is not needed. Spot laser does not need to be emitted, and safety is higher; and laser coaxiality can be realized only by means of red light of the laser.

Description

Technical Field

[0001] The present invention belongs to the technical field of laser calibration, and in particular relates to a laser coaxial calibration device applied to laser equipment and a calibration method thereof. Background Art

[0002] Laser coaxial calibration is an essential preparation before the laser cutting head is officially started. Its purpose is to ensure that the laser passes through the center of the nozzle aperture, thereby improving the cutting quality and the service life of the nozzle. Currently, transparent tape is commonly used in the laser cutting field for laser coaxial calibration. The main steps are as follows:

[0003] 1) Use transparent tape to stick to the nozzle aperture, then shoot the laser to leave a laser dot on the transparent tape.

[0004] 2) Remove the transparent tape and visually check whether the laser dot is centered within the circular outline of the nozzle aperture. If not, repeat steps 1) and 2) until it is.

[0005] However, the above-mentioned laser coaxial alignment method using transparent tape has the following disadvantages:

[0006] (1) Low coaxial efficiency. It is necessary to repeatedly apply transparent tape to the nozzle to remove the outline of the nozzle aperture and the laser dot marks. After each laser dot, the tape must be removed to visually judge the effect. The adjustment range of the coaxial screw is difficult to control.

[0007] (2) Coaxial accuracy is greatly affected by subjectivity. Operation standardization and coaxial accuracy are completely dependent on the subjective experience of the operator. There is a lack of objective reference standards, so the accuracy of coaxial calibration cannot be guaranteed.

[0008] (3) Low safety factor. It requires a point-to-point laser, which can easily cause safety accidents if not operated properly.

[0009] In order to solve the above technical problems, it is necessary to develop a laser coaxial calibration device and a calibration method thereof for use in laser equipment. Summary of the Invention

[0010] The purpose of the present invention is to provide a laser coaxial calibration device and a calibration method for laser equipment to solve the above technical problems. The laser coaxial calibration device can be placed directly under the cutting head, and the whole process of laser coaxial operation can be visualized after being wirelessly connected to the terminal device, which has higher coaxial operation efficiency; the coaxial operation process can be displayed in real time in the operation interface, without the need to repeatedly judge the centering and control the adjustment range of the coaxial screw with the naked eye. At the same time, the coaxial accuracy is more objective and stable; the pixel distance between the center of the red light contour circle and the center of the nozzle light hole contour circle automatically determines whether the coaxial is in place, without the need for manual judgment based on experience. And there is no need to emit a point laser, which is safer; laser coaxial can be achieved with the help of the laser red light.

[0011] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0012] A laser coaxial calibration device for laser equipment includes a camera module that captures the nozzle and laser red light, and a core development board that receives and processes the information from the camera module and determines the relative position of the center of the nozzle aperture outline circle and the center of the red light outline circle. The laser equipment nozzle is provided with a nozzle aperture;

[0013] Preferably, the core development board is arranged below the camera module.

[0014] Preferably, the imaging module includes a camera module. The camera module is electrically connected to the core development board;

[0015] Preferably, the camera module further comprises a filter disposed above the camera module. Along the axial direction of the laser coaxial calibration setting, the camera module and the filter are disposed in sequence, and the filter is disposed toward the nozzle;

[0016] Preferably, the camera module further includes a fill light arranged between the filter and the camera module.

[0017] Preferably, the fill light is integrated on a power management circuit board, and the power management circuit board is electrically connected to the core development board. The power management circuit board is electrically connected to a power source provided in the housing, and the power source is specifically a battery;

[0018] Preferably, the laser coaxial calibration device further includes a shell.

[0019] Preferably, the upper end surface of the housing is provided with a first through hole for facilitating the camera module to shoot, and the first through hole is coaxially arranged with the camera module shooting path.

[0020] Preferably, a spirit level is provided on the upper end surface of the shell.

[0021] Preferably, a wireless antenna is provided on the upper end surface of the housing, and the wireless antenna is electrically connected to the core development board. The wireless antenna is used to transmit WIFI, facilitating communication between the terminal device and the core development board;

[0022] Preferably, a switch button is provided on the side of the housing, wherein the switch button is electrically connected to the core development board;

[0023] Preferably, an indicator light is provided on the side of the housing. The indicator light is provided below the switch button; the indicator light is electrically connected to the core development board;

[0024] Preferably, a charging port for charging the power supply is provided on the side of the housing, wherein the charging port is specifically a Type-C charging interface.

[0025] Preferably, the laser coaxial calibration device is wirelessly connected to the terminal device.

[0026] Preferably, the terminal device includes a mobile phone, tablet, notebook, or desktop computer with WIFI communication connection function.

[0027] Preferably, the terminal device displays the center position of the nozzle light hole outline circle and the center position of the red light outline circle. Specifically, the terminal device displays an operation interface deployed on the core development board, wherein the operation interface displays the center position of the nozzle light hole outline circle and the center position of the red light outline circle in real time;

[0028] Preferably, in the calibration state, the terminal device displays that the distances between the center coordinates (Cx, Cy) of the nozzle light hole contour circle and the center coordinates (Rx, Ry) of the red light contour circle are both 0 on the horizontal and vertical coordinates.

[0029] A calibration method, comprising the laser coaxial calibration device as described above, comprises the following steps:

[0030] The S100 camera module captures the nozzle and laser red light and sends the captured information to the core development board;

[0031] The S200 core development board processes the received shooting information, determines the center of the nozzle light hole contour circle and the center of the red light contour circle, and judges and adjusts the relative position of the center of the nozzle light hole contour circle and the center of the red light contour circle.

[0032] The calibration target is to make the center of the nozzle light hole outline circle coincide with the center of the red light outline circle.

[0033] Preferably, determining the center of the nozzle light hole contour circle includes the following steps:

[0034] S301 uses the target detection algorithm to locate the nozzle aperture;

[0035] S302 cuts out the nozzle light hole area image from the nozzle image according to the position rectangle of the nozzle light hole, and processes it using image technology;

[0036] S303: Fitting the outline circle of the nozzle light hole to obtain the center of the outline circle of the nozzle light hole.

[0037] Preferably, the step S301 of positioning the nozzle light hole includes the following steps:

[0038] The coordinates of the rectangular frame of the light hole (x1, y1, x2, y2) are located by the lightweight deep learning CNN target detection algorithm yolo-faster.

[0039] Among them, x1, y1, x2, and y2 represent the upper left corner abscissa, upper left corner ordinate, lower right corner abscissa, and lower right corner ordinate of the rectangular frame of the nozzle light hole position respectively;

[0040] The step S302 of processing the image of the nozzle aperture area includes the following steps:

[0041] Cut out the nozzle aperture area image from the nozzle image according to the coordinates of the position rectangle frame and perform basic image processing;

[0042] The S303 nozzle aperture contour circle fitting includes the following steps:

[0043] Perform debinarization and threshold segmentation on the result image processed in step S302 to extract all pixels representing the nozzle aperture area. Then, use the least squares method to perform circle fitting to obtain the circle center coordinates (Cx, Cy) and radius R. Cx represents the horizontal coordinate of the circle center after the nozzle aperture contour circle fitting is completed, and Cy represents the vertical coordinate of the circle center after the nozzle aperture contour circle fitting is completed.

[0044] Preferably, the basic image processing includes image grayscale, adaptive binarization and morphology.

[0045] Preferably, determining the center of the red light contour circle includes the following steps:

[0046] S401 red light focus;

[0047] S402 is to fit the red light contour circle to obtain the center of the red light contour circle.

[0048] Preferably, the red light focusing step S401 includes the following steps:

[0049] Slowly adjust the nozzle height to make the brightness of the red light in the imaging image concentrated and the outline circular;

[0050] S402 red light contour circle fitting includes the following steps:

[0051] After completing the red light focusing, the least squares method is used to perform circle fitting to obtain the coordinates of the circle center (Rx, Ry) and the radius Ra. Rx represents the horizontal coordinate of the circle center after the red light contour circle fitting is completed, and Ry represents the vertical coordinate of the circle center after the red light contour circle fitting is completed.

[0052] Preferably, in the process of determining and adjusting the relative positions of the center of the nozzle light hole contour circle and the center of the red light contour circle,

[0053] By adjusting the coaxial screw on the cutting head, the position of the red light contour circle is moved, so that the center coordinates (Rx, Ry) obtained by red light contour fitting are moved, and then adjusted until the center of the red light contour circle coincides with the center of the nozzle light hole contour circle to complete the coaxial calibration.

[0054] Preferably, the terminal device communicates with the core development board;

[0055] The terminal device displays an operation interface, which displays the center position of the nozzle light hole contour circle and the center position of the red light contour circle in real time.

[0056] By adjusting the coaxial screw on the cutting head, the position of the red light contour circle is moved, so that the center coordinates (Rx, Ry) obtained by red light contour fitting are moved, and then adjusted until the center of the red light contour circle coincides with the center of the nozzle light hole contour circle to complete the coaxial calibration.

[0057] This application has achieved beneficial technical effects:

[0058] The laser coaxial calibration device of the present invention automatically determines whether the coaxiality is in place through the pixel distance between the center of the red light contour circle and the center of the nozzle light hole contour circle, without the need for manual judgment based on experience, and has more objective and stable coaxial accuracy.

[0059] The laser coaxial calibration device can be placed directly below the cutting head. Wirelessly connected to a terminal device, the entire laser coaxial calibration process can be visualized, resulting in higher efficiency. The coaxial calibration process is displayed in real time on the user interface, eliminating the need for repeated visual judgment of alignment and coaxial screw adjustment. Furthermore, there's no need for a single laser beam, making it safer. Laser coaxial calibration can be achieved using only the red laser beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 Shown is a schematic structural diagram of the present invention;

[0061] Figure 2 The following is a schematic diagram of the operation interface;

[0062] Figure 3 The figure shows the operation interface before laser coaxial calibration;

[0063] Figure 4 The figure shows the operation interface after laser coaxial calibration;

[0064] Figure 5 The figure shows the working state of the laser coaxial calibration device placed directly below the cutting head;

[0065] Figure 6 The following is a visual coaxial operation diagram of the mobile phone operation interface;

[0066] Figure 7 The figure shows the test results after coaxial calibration using transparent tape;

[0067] Figure 8 The figure shows the test results after coaxial calibration using the calibration method of this technical solution;

[0068] Figure 9 The figure shows the relative position change of the center of the outline circle of the nozzle light hole and the center of the outline circle of the red light before and after the laser coaxial calibration;

[0069] Figure 10 Shown is a schematic flow chart of the calibration method of the present invention.

[0070] Reference numerals

[0071] 1. Wireless antenna; 2. Level; 3. Filter; 4. Power management circuit board; 5. Camera module; 6. Core development board; 7. Switch button; 8. Indicator light; 9. Charging port; 10. First through hole. DETAILED DESCRIPTION

[0072] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other embodiments can be obtained based on these drawings without inventive work.

[0073] The technical solution of the present invention is described in detail below with reference to specific embodiments.

[0074] Reference Figures 1 to 10 In one embodiment of the present invention, a laser coaxial calibration device for laser equipment includes a camera module for capturing images of a nozzle and laser red light, and a core development board 6 for receiving and processing information from the camera module to determine the relative positions of the center of the nozzle aperture contour circle and the center of the red light contour circle. The laser equipment nozzle is provided with a nozzle aperture;

[0075] In one embodiment, the core development board 6 is arranged below the camera module.

[0076] In one embodiment, the camera module includes a camera module 5. The camera module is electrically connected to the core development board;

[0077] In one embodiment, the camera module further includes a filter 3 disposed above the camera module. Along the axial direction of the laser coaxial calibration setting, the camera module and the filter are arranged in sequence, and the filter is arranged toward the nozzle;

[0078] In one embodiment, the camera module further includes a fill light arranged between the filter 3 and the camera module 5 .

[0079] In one embodiment, the fill light is integrated on the power management circuit board 4, and the power management circuit board 4 is electrically connected to the core development board 6. The power management circuit board 4 is electrically connected to a power source provided in the housing, and the power source is specifically a battery;

[0080] In one embodiment, the laser coaxial calibration device further includes a shell 11 .

[0081] In one embodiment, the upper end surface of the housing 11 is provided with a first through hole 10 for facilitating the camera module to shoot. The first through hole 10 is a centering hole, and the first through hole 10 is coaxially arranged with the camera module shooting path.

[0082] In one embodiment, a level 2 is provided on the upper end surface of the housing 11 .

[0083] In one embodiment, a wireless antenna 1 is provided on the upper end surface of the housing 11, and the wireless antenna 1 is electrically connected to the core development board 6. The wireless antenna is used to transmit WIFI, facilitating communication between the terminal device and the core development board 6;

[0084] In one embodiment, a switch button 7 is provided on the side of the housing 11. The switch button 7 is electrically connected to the core development board 6;

[0085] In one embodiment, an indicator light 8 is provided on the side of the housing 11. The indicator light 8 is provided below the switch button to display the power level; the indicator light is electrically connected to the core development board;

[0086] In one embodiment, a charging port 9 for charging the power supply is provided on the side of the housing 11. The charging port 9 is specifically a Type-C charging interface.

[0087] In one embodiment, the laser coaxial calibration device is wirelessly connected to the terminal device.

[0088] In one embodiment, the terminal device includes a mobile phone, tablet, notebook, or desktop computer with WIFI communication connection function.

[0089] In one embodiment, the terminal device displays the center position of the nozzle light hole outline circle and the center position of the red light outline circle. Specifically, the terminal device displays an operation interface deployed on the core development board, wherein the operation interface displays the center position of the nozzle light hole outline circle and the center position of the red light outline circle in real time;

[0090] In one embodiment, in the calibration state, the terminal device displays that the distances between the center coordinates (Cx, Cy) of the nozzle light hole contour circle and the center coordinates (Rx, Ry) of the red light contour circle are both 0 on the horizontal and vertical coordinates.

[0091] A calibration method, comprising the laser coaxial calibration device, comprises the following steps:

[0092] The S100 camera module captures the nozzle and laser red light and sends the captured information to the core development board;

[0093] The S200 core development board processes the received shooting information, determines the center of the nozzle light hole contour circle and the center of the red light contour circle, and judges and adjusts the relative position of the center of the nozzle light hole contour circle and the center of the red light contour circle.

[0094] The calibration target is to make the center of the nozzle light hole outline circle coincide with the center of the red light outline circle.

[0095] In one embodiment, determining the center of the nozzle light hole contour circle comprises the following steps:

[0096] S301 uses the target detection algorithm to locate the nozzle aperture;

[0097] S302 cuts out the nozzle light hole area image from the nozzle image according to the position rectangle of the nozzle light hole, and processes it using image technology;

[0098] S303: Fitting the outline circle of the nozzle light hole to obtain the center of the outline circle of the nozzle light hole.

[0099] In one embodiment, the step S301 of positioning the nozzle light hole includes the following steps:

[0100] The coordinates of the rectangular frame of the light hole (x1, y1, x2, y2) are located by the lightweight deep learning CNN target detection algorithm yolo-faster.

[0101] Among them, x1, y1, x2, and y2 represent the upper left corner abscissa, upper left corner ordinate, lower right corner abscissa, and lower right corner ordinate of the rectangular frame of the nozzle light hole position respectively;

[0102] The step S302 of processing the image of the nozzle aperture area includes the following steps:

[0103] Cut out the nozzle aperture area image from the nozzle image according to the coordinates of the position rectangle frame and perform basic image processing;

[0104] The S303 nozzle aperture contour circle fitting includes the following steps:

[0105] Perform debinarization and threshold segmentation on the result image processed in step S302 to extract all pixels representing the nozzle aperture area. Then, use the least squares method to perform circle fitting to obtain the circle center coordinates (Cx, Cy) and radius R. Cx represents the horizontal coordinate of the circle center after the nozzle aperture contour circle fitting is completed, and Cy represents the vertical coordinate of the circle center after the nozzle aperture contour circle fitting is completed.

[0106] In one embodiment, the basic image processing includes image grayscale, adaptive binarization and morphology.

[0107] In one embodiment, determining the center of the red light contour circle includes the following steps:

[0108] S401 red light focus;

[0109] S402 is to fit the red light contour circle to obtain the center of the red light contour circle.

[0110] In one embodiment, the step S401 of focusing the red light includes the following steps:

[0111] Slowly adjust the nozzle height to make the brightness of the red light in the imaging image concentrated and the outline circular;

[0112] S402 red light contour circle fitting includes the following steps:

[0113] After completing the red light focusing, the least squares method is used to perform circle fitting to obtain the coordinates of the circle center (Rx, Ry) and the radius Ra. Rx represents the horizontal coordinate of the circle center after the red light contour circle fitting is completed, and Ry represents the vertical coordinate of the circle center after the red light contour circle fitting is completed.

[0114] In one embodiment, in the process of determining and adjusting the relative positions of the center of the nozzle light hole contour circle and the center of the red light contour circle,

[0115] By adjusting the coaxial screw on the cutting head, the position of the red light contour circle is moved, so that the center coordinates (Rx, Ry) obtained by red light contour fitting are moved, and then adjusted until the center of the red light contour circle coincides with the center of the nozzle light hole contour circle to complete the coaxial calibration.

[0116] In one embodiment, the terminal device communicates with the core development board;

[0117] The terminal device displays an operation interface, which displays the center position of the nozzle light hole contour circle and the center position of the red light contour circle in real time.

[0118] By adjusting the coaxial screw on the cutting head, the position of the red light contour circle is moved, so that the center coordinates (Rx, Ry) obtained by red light contour fitting are moved, and then adjusted until the center of the red light contour circle coincides with the center of the nozzle light hole contour circle to complete the coaxial calibration.

[0119] After the terminal device is connected to the WIFI transmitted by the laser coaxial calibration device, enter the corresponding address in the address bar 123 of the terminal device's browser to enter the operation interface;

[0120] The operation interface displayed on the terminal device is provided with a display window 121 that can display the center position of the nozzle light hole outline circle and the center position of the red light outline circle in real time, and an operation button area 122 is provided on one side of the display window 121, wherein the operation button area is provided with multiple function buttons, including a "shoot nozzle" button, a "red light picture" button, a "coaxial calibration" button, and a "complete calibration" button;

[0121] In one embodiment, the shell 11 includes a shell body 111, an upper cover 112 arranged above the shell body 111, and a base 113 arranged below the shell body 111; the wireless antenna 1, the level 2, and the first through hole 10 are all arranged on the upper cover 112, and the switch button 7, the indicator light 8, and the charging port 9 are all arranged on the side of the shell body 111; the core development board 6 and the camera module are both arranged in the shell body 111.

[0122] In one embodiment, the camera module is specifically a camera.

[0123] In one of the embodiments, after clicking the "Coaxial Calibration" button, the operation interface displays the values ​​of diff_X and diff_Y in real time during the coaxial calibration process, where diff_X is specifically the absolute value distance between the center coordinates (Cx, Cy) of the nozzle light hole contour circle and the center coordinates (Rx, Ry) of the red light contour circle on the horizontal axis; diff_Y is specifically the absolute value distance between the center coordinates (Cx, Cy) of the nozzle light hole contour circle and the center coordinates (Rx, Ry) of the red light contour circle on the vertical axis. When the displayed values ​​of diff_X and diff_Y are both equal to 0, the coaxial calibration is completed; this operation method makes it easy to determine whether the distances between the center coordinates (Cx, Cy) of the nozzle light hole contour circle and the center coordinates (Rx, Ry) of the red light contour circle on the horizontal and vertical axes are both 0, solves the problem of the calibration process and the calibration result check being out of sync, and provides timely real-time display feedback, thereby improving calibration efficiency.

[0124] The calculation formulas for diff_X and diff_Y are as follows:

[0125] diff_X = |Cx-Rx| or diff_X = |Rx-Cx|;

[0126] diff_Y=|Cy-Ry| or diff_Y=|Ry-Cy|;

[0127] Where Cx represents the horizontal coordinate of the center of the nozzle light hole contour circle after the fitting is completed, and Cy represents the vertical coordinate of the center of the nozzle light hole contour circle after the fitting is completed; Rx represents the horizontal coordinate of the center of the red light contour circle after the fitting is completed, and Ry represents the vertical coordinate of the center of the red light contour circle after the fitting is completed.

[0128] The operation interface is deployed on the core development board, which is connected to the core development board through terminal device communication, and then the operation interface is displayed on the terminal device. The operator clicks the function buttons of the operation interface on the terminal device and performs coaxial calibration operations on the laser.

[0129] This technical solution has the following technical effects:

[0130] 1) The average coaxial deviation is less than 0.05 mm, which is 45.1% lower than that of the transparent glue method and is more objective and stable.

[0131] 2) The coaxial efficiency is improved by nearly 95.8% compared with the transparent glue method.

[0132] 3) Since there is no point-shooting laser, the safety risk can be almost ignored.

[0133] The embodiments of the present invention will be described in detail below with reference to specific examples.

[0134] This invention implements a laser coaxial alignment device based on computer vision technology. It can be placed directly below the cutting head and wirelessly connected to the device via a mobile phone to visualize the entire laser coaxial alignment process. It has the following main features:

[0135] Higher coaxial operation efficiency; the coaxial operation process can be displayed in real time on the operation interface, eliminating the need to repeatedly visually judge the alignment and control the coaxial screw adjustment range.

[0136] More objective and stable coaxial accuracy; the coaxiality is automatically judged by the center pixel distance between the red light contour circle and the nozzle aperture contour circle, without the need for manual judgment based on experience.

[0137] No need to emit laser beams, which is safer; laser coaxiality can be achieved with the help of laser red light.

[0138] The present invention implements a laser coaxial calibration device based on computer vision technology. Its specific structure includes a housing, an imaging module, a fill light and a power management circuit board, a filter, and a core development board.

[0139] Imaging module: After the device is turned on, it obtains the nozzle or red light video stream in real time, and pushes the camera's real-time image stream to the coaxial operation interface through the video push program deployed on the core development board.

[0140] Fill light and power management circuit board: Communicates with the backend software on the core board via the URT serial communication protocol to control the on / off and brightness of the fill light. It also monitors the battery charge and discharge status, and displays this through LED lights as indicators.

[0141] Filter: Low bandpass, can effectively filter out stray light in the laser red light, highlighting the bright area in the center of the red light. Can use the blue light of the fill light to supplement the nozzle.

[0142] Core development board: deploys background control software, video streaming software, and image processing algorithm software.

[0143] Operating Mode: The laser coaxial calibration device utilizes a human-machine interface, providing visual assistance for laser coaxial calibration. Upon powering on, the device automatically transmits a Wi-Fi signal. Users can then connect to the user interface via Wi-Fi-enabled devices such as mobile phones, laptops, and tablets. The user interface is implemented using a front-end development language and deployed within the core development platform. Wi-Fi communication is achieved through parameter configuration of the core development platform's wireless module.

[0144] Working principle: This device realizes laser coaxiality based on the principle of two concentric circles. Figure 4As shown, the yellow circle is the optimal contour circle of the nozzle aperture fitted using image processing technology; the red circle is the optimal contour circle of the red light bright spot fitted using image processing technology. When the coaxial screw on the cutting head is turned with an Allen screwdriver, the red light contour circle moves in real time until the distance between the red light contour circle center coordinates (Rx, Ry) and the nozzle contour circle center coordinates (Cx, Cy) on the horizontal and vertical coordinates are both 0, which means the calibration is in place. Specifically, the judgment is made by comparing the absolute value distance between the red light contour circle center coordinates (Rx, Ry) and the nozzle contour circle center coordinates (Cx, Cyy).

[0145] Specific implementation process

[0146] Step 1: Equipment Alignment

[0147] 1) Turn on the red laser light and place the device directly under the nozzle.

[0148] 2) Adjust the nozzle to a height of about 7mm-10mm above the equipment.

[0149] 3) Fine-tune the position of the device until all the red light enters the first through hole 10 of the upper cover 112 to complete the device alignment.

[0150] Step 2: Device connection and interface login

[0151] 1) Press the power button to start the device. The background software, image processing software, etc. will automatically start.

[0152] 2) About 10 seconds after powering on, open the WiFi interface on your phone and connect to the WiFi named NVA.

[0153] 3) Set your phone screen to auto-rotate mode or set your phone browser to landscape mode to ensure the operation interface can be displayed in landscape mode.

[0154] 4) Open the mobile browser and enter: 192.168.0.1:8088 in the address bar to enter the operation interface.

[0155] Step 3: Fitting the contour circle of the nozzle aperture

[0156] After logging into the operation interface, the fill light will automatically turn on and a black and white picture of the nozzle will appear on the operation interface. Clicking the "Photograph Nozzle" button will automatically capture the nozzle picture and perform circle fitting of the aperture contour. The specific implementation steps are as follows:

[0157] 1) Positioning the nozzle aperture

[0158] The coordinates of the rectangular box of the light hole are located (x1, y1, x2, y2) through the lightweight deep learning CNN target detection algorithm yolo-faster, where x1, y1, x2, y2 represent the upper left corner horizontal coordinate, upper left corner vertical coordinate, lower right corner horizontal coordinate and lower right corner vertical coordinate of the rectangular box of the light hole position, respectively.

[0159] 2) Image processing of the nozzle aperture area

[0160] The nozzle aperture area image is cropped from the nozzle image according to the coordinates of the position rectangle, and basic image processing such as image grayscale, adaptive binarization and morphology is performed.

[0161] 3) Nozzle aperture contour circle fitting

[0162] The result image processed in step 2) is debinarized and threshold segmented to extract all the pixels representing the nozzle light hole area. Then, the least squares method is used to perform circle fitting to obtain the center coordinates (Cx, Cy) and radius R.

[0163] Step 4: Coaxial Calibration

[0164] After completing the nozzle aperture circle fitting, turn on the laser red light, click the "Red Light Screen" button to automatically display the red light screen, and perform red light contour circle fitting. The specific implementation steps are as follows:

[0165] 1) Red light focus.

[0166] Red light focusing is a process of slowly adjusting the nozzle height so that the brightness of the red light in the imaging image is concentrated and the outline is circular.

[0167] 2) Red light contour circle fitting

[0168] After the red light focusing is completed, the least square method is used to perform circle fitting to obtain the coordinates of the circle center (Rx, Ry) and the radius Ra.

[0169] 3) Click the "Coaxial Calibration" button, and the nozzle image and the real-time fitting result of the red light circle fitting will appear in the operation interface, as shown in the following figure: Figure 3 Then use an inner hexagon screwdriver to adjust the coaxial screw on the cutting head to move the position of the red light circle. Once the two circles are aligned, the coaxial calibration is complete.

[0170] Figure 7 The figure shows the test results of coaxial calibration using transparent tape in the existing technology. This result is provided by KEYENCE professional measurement equipment. It can be seen that the coaxial deviation of the transparent tape method on a nozzle with a diameter of 1.7mm reaches 0.11mm.

[0171] Figure 8The figure shows the test results after coaxial calibration using the calibration method of this technical solution. This result is provided by KEYENCE professional measuring equipment. It can be seen that the coaxial deviation of this equipment on a nozzle with a diameter of 1.7mm is only 0.03mm.

[0172] Testing on common domestic laser brands and power levels, as well as comparative analysis with the currently used transparent tape coaxial method, demonstrates the following benefits of this solution: 1) Average coaxial deviation is less than 0.05mm, a 45.1% reduction compared to the transparent tape method, demonstrating improved objectivity and stability. 2) Coaxial efficiency is increased by nearly 95.8% compared to the transparent tape method. 3) Because it eliminates the need for point-and-shoot lasers, safety risks are negligible.

[0173] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0174] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

[0175] The above is a detailed description of an embodiment of a laser coaxial calibration device and a calibration method thereof for laser equipment provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in several ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A laser coaxial calibration device for laser equipment, characterized in that: It comprises a housing (11), a camera module for photographing the nozzle and the red light of the laser, and a core development board (6) for receiving and processing information from the camera module and determining the relative position of the center of the outline circle of the nozzle light hole and the center of the outline circle of the red light; The camera module comprises a camera module (5), a filter (3) arranged above the camera module, and a fill light arranged between the filter (3) and the camera module (5); The fill light is integrated on a power management circuit board (4), and the power management circuit board (4) is electrically connected to a core development board (6).

2. The laser coaxial calibration device according to claim 1, characterized in that: The laser coaxial calibration device is wirelessly connected to the terminal device.

3. A calibration method, characterized in that: The steps include: The S100 camera module captures the nozzle and laser red light and sends the captured information to the core development board; The S200 core development board processes the received shooting information, determines the center of the nozzle light hole contour circle and the center of the red light contour circle, and determines whether the center of the nozzle light hole contour circle coincides with the center of the red light contour circle.

4. The calibration method according to claim 3, wherein: Determining the center of the nozzle light hole contour circle includes the following steps: S301 uses the target detection algorithm to locate the nozzle aperture; S302 cuts out the nozzle light hole area image from the nozzle image according to the position rectangle of the nozzle light hole, and processes it using image technology; S303: Fitting the outline circle of the nozzle light hole to obtain the center of the outline circle of the nozzle light hole.

5. The calibration method according to claim 4, characterized in that: The step S301 of positioning the nozzle light hole includes the following steps: The coordinates of the rectangular frame of the light hole (x1, y1, x2, y2) are located by the lightweight deep learning CNN target detection algorithm yolo-faster. Among them, x1, y1, x2, and y2 represent the upper left corner abscissa, upper left corner ordinate, lower right corner abscissa, and lower right corner ordinate of the rectangular frame of the nozzle light hole position respectively; The step S302 of processing the image of the nozzle aperture area includes the following steps: The nozzle aperture area image is cropped from the nozzle image according to the coordinates of the position rectangle frame and image processing is performed; The S303 nozzle aperture contour circle fitting includes the following steps: The result image processed in step S302 is subjected to debinarization and threshold segmentation to extract all pixel points representing the nozzle light hole area, and then a least squares method is used to perform circle fitting to obtain the center coordinates (Cx, Cy) and radius R.

6. The calibration method according to claim 5, characterized in that: The image processing includes image grayscale, adaptive binarization and morphology.

7. The calibration method according to claim 5 or 6, characterized in that: Determining the center of the red light outline circle includes the following steps: S401 red light focus; S402 is to fit the red light contour circle to obtain the center of the red light contour circle.

8. The calibration method according to claim 7, characterized in that: The red light focusing step S401 includes the following steps: Slowly adjust the nozzle height to make the brightness of the red light in the imaging image concentrated and the outline circular; S402 red light contour circle fitting includes the following steps: After the red light focusing is completed, the least square method is used to perform circle fitting to obtain the coordinates of the circle center (Rx, Ry) and the radius Ra.

9. The calibration method according to claim 8, characterized in that: In the process of determining and adjusting the relative positions of the center of the nozzle light hole contour circle and the center of the red light contour circle, By adjusting the coaxial screw on the cutting head, the position of the red light contour circle is moved, so that the center coordinates (Rx, Ry) obtained by red light contour fitting are moved, and then adjusted until the center of the red light contour circle coincides with the center of the nozzle light hole contour circle to complete the coaxial calibration.

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