Light-curing 3D printing equipment monitoring system, method, equipment and storage medium

Abstract

The present invention discloses a monitoring system, method, device and storage medium for photocuring 3D printing equipment, and relates to the field of 3D printing technology. The system includes: a laser for outputting laser; a laser optical path control unit for transmitting laser, the laser is used to irradiate the printed workpiece to solidify the printed workpiece; a coherent modulation imaging unit for receiving the diffraction pattern formed after the laser passes through the solidified printed workpiece molding surface, and forming an image according to the diffraction pattern; a main control unit connected to the coherent modulation imaging unit, used to acquire an image, judge the quality of the printed workpiece molding surface according to the image, and send a modulation signal according to the judgment result; a laser control unit, connected to the main control unit and the laser optical path control unit, used to modulate the laser transmitted by the laser optical path control unit according to the modulation signal. The entire monitoring process is carried out in real time with high reliability, so that the incident laser irradiating the printed workpiece can be adaptively adjusted to meet the printing requirements of the printed workpiece.

Description

Technical Field

[0001] The present invention relates to the field of 3D printing technology, and in particular to a light-curing 3D printing equipment monitoring system, method, equipment and storage medium. Background Art

[0002] 3D printing technology refers to converting a design model into a three-dimensional entity by printing layer by layer. Compared with traditional mechanical processing technology, 3D printing technology simplifies the process and reduces production costs. At present, the main light-curing 3D printing technologies are stereolithography apparatus (SLA) printing and digital light processing (DLP) printing. However, during the printing process, factors such as resin purity, printing parameters, and complex structure of the printed model may result in low quality of the printed workpiece. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a light-curing 3D printing equipment monitoring system, method, equipment and storage medium, which can monitor the printing process of the light-curing 3D printing equipment in real time, thereby improving the quality of the printed workpiece.

[0004] A light-curing 3D printing equipment monitoring system according to a first embodiment of the present invention includes:

[0005] A laser, wherein the laser is used to output laser light;

[0006] A laser light path control unit, the laser light path control unit is used to transmit the laser, and the laser is used to irradiate the printed workpiece to solidify the printed workpiece;

[0007] A coherent modulation imaging unit, the coherent modulation imaging unit is used to receive a diffraction pattern formed after the laser passes through the cured printed workpiece molding surface, and is used to form an image according to the diffraction pattern;

[0008] A main control unit, the main control unit is connected to the coherent modulation imaging unit, and is used to obtain the image, and to judge the quality of the molding surface of the printed workpiece according to the image, and send a modulation signal according to the judgment result;

[0009] A laser control unit is connected to the main control unit and the laser optical path control unit, and is used to receive a modulation signal from the main control unit and modulate the laser transmitted by the laser optical path control unit according to the modulation signal.

[0010] According to the photocuring 3D printing equipment monitoring system of the embodiment of the present invention, there are at least the following beneficial effects: the laser outputs laser light, which is transmitted through the laser light path control unit and irradiated onto the printed workpiece to realize photocuring 3D printing. The coherent modulation imaging unit receives the diffraction pattern formed after the laser passes through the cured printed workpiece molding surface (the printed workpiece molding surface is the layer being printed), forms an image based on the diffraction pattern, and sends it to the main control unit. The main control unit obtains the image, judges the quality of the printed workpiece molding surface based on the image, and sends a modulation signal based on the judgment result. The laser control unit receives the modulation signal and modulates the laser transmitted by the laser light path control unit according to the modulation signal. The entire monitoring process is carried out in real time with high reliability, so that the incident laser irradiating the printed workpiece can be adaptively adjusted to meet the printing requirements of the printed workpiece.

[0011] According to some embodiments of the present invention, the laser light path control unit includes:

[0012] A coupling component, the coupling component comprising:

[0013] A collimator, the collimator is used to convert the laser light output by the laser into parallel light;

[0014] A lens, wherein the lens is used to converge the parallel light;

[0015] A beam splitter is used to split the converged parallel light into incident laser light and feedback laser light.

[0016] According to some embodiments of the present invention, the laser light path control unit further includes:

[0017] A galvanometer is used to receive the incident laser beam split by the beam splitter and to position the incident laser beam.

[0018] According to some embodiments of the present invention, the laser light path control unit further includes:

[0019] A projection mirror is used to converge the positioned incident laser so that its focus is aligned with the printing workpiece.

[0020] According to some embodiments of the present invention, the coherent modulation imaging unit includes a coherent modulation unit and a light imaging unit, the coherent modulation unit is connected to the light imaging unit, and the light imaging unit is connected to the main control unit;

[0021] The optical imaging unit is used to receive a diffraction pattern formed after the incident laser passes through the solidified printed workpiece molding surface, and form an image according to the diffraction pattern;

[0022] The coherent modulation unit is used to modulate the phase of the laser that passes through the solidified molding surface of the printed workpiece.

[0023] According to some embodiments of the present invention, the laser control unit includes an acousto-optic modulation unit and a laser power metering unit;

[0024] The laser power metering unit is connected to the main control unit, and is used to receive the feedback laser separated by the beam splitter and calculate the power of the feedback laser and send it to the main control unit. The main control unit is used to judge whether the power of the feedback laser needs to be adjusted according to the quality of the molding surface of the printed workpiece, and if adjustment is required, a modulation signal is sent to the acousto-optic modulation unit;

[0025] The acousto-optic modulation unit is connected to the main control unit and the collimator, and is used to modulate the intensity of the parallel light output by the collimator according to the modulation signal.

[0026] A method for monitoring a photocuring 3D printing device according to a second aspect of the present invention includes:

[0027] Acquire an image, wherein the image is formed according to a diffraction pattern formed after the laser passes through the cured molding surface of the printed workpiece;

[0028] judging the quality of the molding surface of the printed workpiece according to the image;

[0029] Sending a modulated signal according to the judgment result;

[0030] The modulation signal is received, and the laser is modulated according to the modulation signal; wherein the laser is used to irradiate the printed workpiece to solidify the printed workpiece.

[0031] The monitoring method of the photocuring 3D printing device according to the embodiment of the present invention has at least the following beneficial effects: acquiring an image, judging the quality of the molding surface of the printed workpiece according to the image, and sending a modulation signal according to the judgment result to modulate the laser transmitted by the laser optical path control unit. The above monitoring method is carried out in real time and has high reliability, so that the incident laser irradiating the printed workpiece can be adaptively adjusted to meet the printing requirements of the printed workpiece.

[0032] According to some embodiments of the present invention, judging the quality of the molding surface of the printed workpiece according to the image includes:

[0033] Calculating the error between the image and a preset image;

[0034] Determining whether the error is within a preset range;

[0035] The quality of the molding surface of the printed workpiece is judged according to the judgment result.

[0036] An electronic device according to an embodiment of a third aspect of the present invention includes:

[0037] at least one processor, and

[0038] a memory communicatively connected to the at least one processor; wherein,

[0039] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the light-curing 3D printing equipment monitoring method described in the second aspect.

[0040] According to the computer-readable storage medium of the fourth aspect embodiment of the present invention, the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the light-curing 3D printing equipment monitoring method described in the second aspect.

[0041] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0043] Figure 1 A schematic diagram of the structure of a light-curing 3D printing equipment monitoring system provided by an embodiment of the present invention;

[0044] Figure 2 A schematic diagram of the structure of a light-curing 3D printing equipment monitoring system provided by another embodiment of the present invention;

[0045] Figure 3 A schematic diagram of a process for monitoring a light-curing 3D printing device provided in one embodiment of the present invention;

[0046] Figure 4 for Figure 3 Schematic diagram of the sub-step flow chart of step S200.

[0047] Reference numerals:

[0048] Laser 100, laser optical path control unit 200, coupling component 210, collimator 211, lens 212, spectrometer 213, galvanometer 220, projection mirror 230, printing workpiece 300, coherent modulation imaging unit 400, coherent modulation unit 410, optical imaging unit 420, main control unit 500, laser control unit 600, acousto-optic modulation unit 610, laser power metering unit 620. DETAILED DESCRIPTION

[0049] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0050] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0052] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0053] At present, the main light-curing 3D printing technologies are stereolithography apparatus (SLA) printing and digital light processing (DLP) printing. However, during the printing process, factors such as resin purity, printing parameters, and complex structure of the printed model may cause defects such as staggered layers, delamination, bending and deformation of the printed workpiece, resulting in low quality. The current light-curing 3D printing equipment monitoring system mainly monitors the amount of resin box material and the liquid level height change of the resin tank through sensors, calculates the actual amount of material used in the printed workpiece, compares it with the expected amount of material used, and uses this to determine whether the printing process is normal. The printing quality is evaluated by material difference, the defect location and defect size are uncertain, and the accuracy is not high. If the liquid level height and quality difference required to be monitored are highly accurate, the sensor sensitivity requirements are higher, and the cost index rises.

[0054] At present, there are few systems that use optical principles to monitor light-curing 3D printing equipment in real time. Using optical monitoring, the accuracy can reach tens of microns. By judging the quality of the printed workpiece molding surface, the printing parameters (mainly the laser power of the incident laser irradiating the printed workpiece) are optimized or corrected, thereby preparing a higher-precision printed workpiece.

[0055] Based on this, the embodiments of the present invention provide a light-curing printing device monitoring system, method, device and storage medium, which can perform optical real-time monitoring of the printing process of the light-curing 3D printing device, thereby improving the quality of the printed workpiece.

[0056] Reference Figure 1 , is a schematic diagram of the structure of the light-curing 3D printing equipment monitoring system provided by an embodiment of the present invention. Figure 1 As shown, the system includes:

[0057] A laser 100, the laser 100 is used to output laser light;

[0058] A laser light path control unit 200, the laser light path control unit 200 is used to transmit laser light, and the laser light is used to irradiate the printed workpiece 300 to solidify the printed workpiece 300;

[0059] A coherent modulation imaging unit 400, which is used to receive a diffraction pattern formed after the laser passes through the cured printed workpiece molding surface, and to form an image according to the diffraction pattern;

[0060] A main control unit 500, which is connected to the coherent modulation imaging unit 400, and is used to acquire an image, and to judge the quality of the molding surface of the printed workpiece according to the image, and to send a modulation signal according to the judgment result;

[0061] The laser control unit 600 is connected to the main control unit 500 and the laser optical path control unit 200, and is used to receive a modulation signal from the main control unit 500, and modulate the laser transmitted by the laser optical path control unit 200 according to the modulation signal.

[0062] The laser 100 outputs laser light, which is transmitted through the laser light path control unit 200 and irradiated onto the printed workpiece 300 to realize photocuring 3D printing. The coherent modulation imaging unit 400 receives the diffraction pattern formed after the laser passes through the cured printed workpiece molding surface (the printed workpiece molding surface is the layer being printed), forms an image based on the diffraction pattern, and sends it to the main control unit 500. The main control unit 500 obtains the image, judges the quality of the printed workpiece molding surface based on the image, and sends a modulation signal to the laser control unit 600 based on the judgment result. The laser control unit 600 modulates the laser transmitted by the laser light path control unit 200 according to the modulation signal. The entire monitoring process is carried out in real time, and the accuracy can reach tens of microns by using optical monitoring, with high reliability, so that the incident laser irradiating the printed workpiece can be adaptively adjusted to meet the printing requirements of the printed workpiece, thereby preparing a higher precision printed workpiece.

[0063] In some embodiments, the laser 100 is one or more of a solid laser, a gas laser, a semiconductor laser, and a common ultraviolet lamp.

[0064] In some embodiments, the main control unit 500 can be implemented by a device with data processing capability, such as a processor, a main controller, a single chip microcomputer, a PC, etc.

[0065] Reference Figure 2 , is a schematic diagram of the structure of a light-curing 3D printing equipment monitoring system provided by another embodiment of the present invention. Figure 2 As shown, the laser light path control unit 200 includes:

[0066] The coupling assembly 210 includes a collimator 211, a lens 212 and a beam splitter 213. The collimator 211 is used to convert the laser output by the laser 100 into parallel light, the lens 212 is used to converge the parallel light, and the beam splitter 213 is used to divide the converged parallel light into an incident laser and a feedback laser. The incident laser is used to irradiate the printed workpiece, and the feedback laser is used to be input into the laser control unit 600 so that the laser control unit 600 calculates the power of the feedback laser.

[0067] In some embodiments, Figure 2 As shown, the laser light path control unit 200 also includes:

[0068] The galvanometer 220 is used to receive the incident laser beam split by the beam splitter 213 and position the incident laser beam. The galvanometer 220 is driven by a motor to rotate back and forth along the axis at high speed to achieve the purpose of changing the path of the laser beam. The incident laser beam is positioned by the galvanometer 220 so that the incident laser beam can be transmitted along the path to the projection mirror.

[0069] In some embodiments, Figure 2 As shown, the laser light path control unit 200 also includes:

[0070] The projection mirror 230 is aimed at the printed workpiece 300. The projection mirror 230 is used to converge the incident laser after positioning so that its focus is aligned with the printed workpiece 300. In some embodiments, the projection mirror 230 includes a projection lens and an aperture diaphragm. The laser from the projection lens passes through the aperture diaphragm and is irradiated onto the printed workpiece.

[0071] In some embodiments, the projection lens may be a refractive, catadioptric, reflective, or diffractive microscope objective or a refractive, catadioptric, reflective, or diffractive lithography lens.

[0072] In some embodiments, Figure 2 As shown, the coherent modulation imaging unit 400 includes a coherent modulation unit 410 and an optical imaging unit 420, the coherent modulation unit 410 is connected to the optical imaging unit 420, and the optical imaging unit 420 is connected to the main control unit 500;

[0073] The optical imaging unit 420 is used to receive the diffraction pattern formed after the incident laser passes through the solidified printed workpiece molding surface, and form an image according to the diffraction pattern;

[0074] The coherent modulation unit 410 is used to control the phase of the laser beam that passes through the solidified molding surface of the printed workpiece.

[0075] In some embodiments, the coherent modulation unit 410 uses a phase plate. The optical imaging unit 420 includes an image sensor. The image sensor receives the diffraction pattern formed after the incident laser passes through the cured printed workpiece molding surface, collects light intensity distribution data, generates an image according to the diffraction pattern, and sends it to the main control unit 500. The coherent modulation unit 410 can modulate the phase of the laser passing through the cured printed workpiece molding surface during the above optical imaging process, and can enhance the interference effect of different parts of the laser light wave passing through the printed workpiece molding surface, so that the image sensor can collect light wave data with more printed workpiece information to form a higher quality image.

[0076] In some embodiments, Figure 2 As shown, the laser control unit 600 includes an acousto-optic modulation unit 610 and a laser power metering unit 620 .

[0077] The laser power metering unit 620 is connected to the main control unit 500. The laser power metering unit 620 is used to receive the feedback laser split by the beam splitter 213 and calculate the power of the feedback laser and send it to the main control unit 500. The main control unit 500 is used to judge whether the power of the feedback laser needs to be adjusted according to the quality of the workpiece forming surface. If adjustment is required, a modulation signal is sent to the acousto-optic modulation unit 610.

[0078] The acousto-optic modulation unit 610 is connected to the main control unit 500 and the collimator 211 . The acousto-optic modulation unit 610 is used to receive a modulation signal and modulate the intensity of the parallel light output by the collimator 211 according to the modulation signal.

[0079] Specifically, the laser power metering unit 620 calculates the power of the feedback laser and sends it to the main control unit 500. The main control unit 500 determines the quality of the printed workpiece molding surface based on the image. Specifically, it can determine the morphology of the printed workpiece molding surface by whether the image clarity, grayscale change and other parameters are within a preset range, thereby determining the quality. If it is determined that the quality of the printed workpiece molding surface does not meet the requirements (the error is too large), the main control unit 500 determines that the power of the feedback laser needs to be adjusted, and sends a modulation signal to the acousto-optic modulation unit 610. The acousto-optic modulation unit 610 modulates the intensity of the parallel light output by the collimator 211 according to the modulation signal; if it is determined that the quality of the printed workpiece molding surface meets the requirements, the main control unit 500 determines that the power of the feedback laser does not need to be adjusted, and does not send a modulation signal.

[0080] It is worth noting here that if it is determined that the quality of the molding surface of the printed workpiece does not meet the requirements, the main control unit 500 can also send a modulation signal to the galvanometer 220, or simultaneously send a modulation signal to the galvanometer 220 and the acousto-optic modulation unit 610. Sending a modulation signal to the galvanometer 220 can adjust the parameters of the galvanometer 220, specifically the laser beam path.

[0081] Further, refer to Figure 3 , is a flow chart of a method for monitoring a light-curing 3D printing device provided by an embodiment of the present invention. Figure 3 As shown, the method includes:

[0082] S100, acquiring an image, where the image is formed according to a diffraction pattern formed after the laser passes through the solidified printed workpiece molding surface;

[0083] S200, judging the quality of the molding surface of the printed workpiece according to the image;

[0084] S300, sending a modulated signal according to the judgment result;

[0085] S400, receiving a modulation signal, and modulating a laser according to the modulation signal; wherein the laser is used to irradiate a printed workpiece to solidify the printed workpiece.

[0086] An image is acquired, the quality of the molding surface of the printed workpiece is judged according to the image, a modulation signal is sent according to the judgment result, and a laser used to cure the printed workpiece is modulated according to the modulation signal.

[0087] In some embodiments, Figure 4 As shown, step S200 includes:

[0088] S210, calculating the error between the image and the preset image;

[0089] S220, determine whether the error is within a preset range; if so, execute step S230, otherwise execute step S240;

[0090] S230, judging that the quality of the molding surface of the printed workpiece meets the requirements;

[0091] S240, determining that the quality of the molding surface of the printed workpiece does not meet the requirements.

[0092] In some embodiments, the error between the image and the preset image can be specifically calculated by the difference between the image's clarity, grayscale change and other parameters and the preset image's clarity, grayscale change and other parameters. By judging whether the error is within a preset range, it is judged whether the quality of the printed workpiece molding surface meets the requirements.

[0093] In some embodiments, the specific process of the above-mentioned light-curing 3D printing equipment monitoring method can refer to the description of the light-curing 3D printing equipment monitoring system, which will not be repeated here. The above-mentioned light-curing 3D printing equipment monitoring method is carried out in real time and has high reliability, so that the incident laser irradiating the printed workpiece can be adaptively adjusted to meet the printing requirements of the printed workpiece, thereby preparing a higher precision printed workpiece.

[0094] Furthermore, an embodiment of the present invention provides an electronic device, including:

[0095] at least one processor, and

[0096] a memory communicatively connected to at least one processor; wherein,

[0097] The memory stores instructions that can be executed by at least one processor, and the instructions are executed by at least one processor so that the at least one processor can execute the above-mentioned light-curing 3D printing equipment monitoring method.

[0098] For example, steps S100 to S400 of the above-mentioned method for monitoring the light-curing 3D printing device may be performed.

[0099] Furthermore, an embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to enable a computer to execute the above-mentioned light-curing 3D printing equipment monitoring method.

[0100] For example, steps S100 to S400 of the above-mentioned method for monitoring the light-curing 3D printing device may be performed.

[0101] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

[0102] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0103] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0104] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0105] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A light-curing 3D printing equipment monitoring system, characterized in that: include: A laser, wherein the laser is used to output laser light; A laser light path control unit, the laser light path control unit is used to transmit the laser, and the laser is used to irradiate the printed workpiece to solidify the printed workpiece; A coherent modulation imaging unit, the coherent modulation imaging unit is used to receive a diffraction pattern formed after the laser passes through the cured printed workpiece molding surface, and is used to form an image according to the diffraction pattern; A main control unit, the main control unit is connected to the coherent modulation imaging unit, and is used to obtain the image, and to judge the quality of the molding surface of the printed workpiece according to the image, and send a modulation signal according to the judgment result; A laser control unit is connected to the main control unit and the laser optical path control unit, and is used to receive a modulation signal from the main control unit and modulate the laser transmitted by the laser optical path control unit according to the modulation signal.

2. The light-curing 3D printing equipment monitoring system according to claim 1, characterized in that: The laser light path control unit comprises: A coupling component, the coupling component comprising: A collimator, the collimator is used to convert the laser light output by the laser into parallel light; A lens, wherein the lens is used to converge the parallel light; A beam splitter is used to split the converged parallel light into an incident laser and a feedback laser, wherein the incident laser is used to irradiate the printing workpiece, and the feedback laser is used to be input into the laser control unit so that the laser control unit calculates the power of the feedback laser.

3. The light-curing 3D printing equipment monitoring system according to claim 2, characterized in that: The laser light path control unit also includes: A galvanometer is used to receive the incident laser beam split by the beam splitter and to position the incident laser beam.

4. The light-curing 3D printing equipment monitoring system according to claim 3, characterized in that: The laser light path control unit also includes: A projection mirror is used to converge the positioned incident laser so that its focus is aligned with the printing workpiece.

5. The light-curing 3D printing equipment monitoring system according to claim 4, characterized in that: The coherent modulation imaging unit includes a coherent modulation unit and a light imaging unit, the coherent modulation unit is connected to the light imaging unit, and the light imaging unit is connected to the main control unit; The optical imaging unit is used to receive a diffraction pattern formed after the incident laser passes through the solidified printed workpiece molding surface, and form an image according to the diffraction pattern; The coherent modulation unit is used to modulate the phase of the laser that passes through the solidified molding surface of the printed workpiece.

6. The light-curing 3D printing equipment monitoring system according to any one of claims 2 to 5, characterized in that: The laser control unit includes an acousto-optic modulation unit and a laser power metering unit; The laser power metering unit is connected to the main control unit, and is used to receive the feedback laser separated by the beam splitter and calculate the power of the feedback laser and send it to the main control unit. The main control unit is used to determine whether the power of the feedback laser needs to be adjusted according to the quality of the molding surface of the printed workpiece, and if adjustment is required, send a modulation signal to the acousto-optic modulation unit; The acousto-optic modulation unit is connected to the main control unit and the collimator, and is used to modulate the intensity of the parallel light output by the collimator according to the modulation signal.

7. A method for monitoring a light-curing 3D printing device, characterized in that: include: Acquire an image, wherein the image is formed according to a diffraction pattern formed after the laser passes through the cured molding surface of the printed workpiece; judging the quality of the molding surface of the printed workpiece according to the image; Sending a modulated signal according to the judgment result; The modulation signal is received, and the laser is modulated according to the modulation signal; wherein the laser is used to irradiate the printed workpiece to solidify the printed workpiece.

8. The method for monitoring a light-curing 3D printing device according to claim 7, characterized in that: The step of judging the quality of the molding surface of the printed workpiece according to the image comprises: Calculating the error between the image and a preset image; Determining whether the error is within a preset range; The quality of the molding surface of the printed workpiece is judged according to the judgment result.

9. An electronic device, characterized in that: include: at least one processor, and a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the light-curing 3D printing equipment monitoring method as described in claim 7 or 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the light-curing 3D printing equipment monitoring method according to claim 7 or 8.

Images