Partitioned exposure curing system and method of photocuring 3D printer

Abstract

The invention discloses a partitioned exposure curing system and method of a photocuring 3D printer, and belongs to the technical field of photocuring printing. The system comprises a light source module, a light track, a partition shutter group, a light energy constant control unit and a control module, ultraviolet light output by the light source module is guided to a printing area through the light track, the partition shutter group is controlled by a plurality of independent driving units to open a time sequence, and the light energy constant control unit realizes closed-loop power regulation through light intensity and temperature detection. The control panel module dynamically synchronizes the exposure area according to the nozzle motion parameters, so that the energy output is uniform, and the boundary curing precision is improved. The energy consumption can be remarkably reduced, the service life of the light source can be prolonged, and the method is suitable for medium-large photocuring 3D printing equipment.

Description

Technical Field

[0001] This invention relates to the field of printer technology, specifically demonstrating a partitioned exposure curing system and method for a photopolymer 3D printer. Background Technology

[0002] Photopolymer 3D printing, also known as stereolithography, is an advanced molding technology based on the principle of additive manufacturing. Its basic process involves selectively irradiating liquid photosensitive resin with light of a specific wavelength (usually ultraviolet light), causing the resin in the irradiated area to undergo a cross-linking reaction and solidify, thereby accumulating layer by layer to form a three-dimensional solid.

[0003] In existing surface-exposure photopolymerization 3D printers, a single, complete layer pattern is typically projected using a full-surface light source (such as an LCD screen or DLP optical engine) to achieve rapid curing of the entire layer. However, for large-format 3D printing applications, especially in industrial model and mold manufacturing, PolyJet or similar processes based on "inkjet + UV instant curing" technology are more common. In this process, the printhead moves in the XY plane, simultaneously ejecting micro-droplets of photosensitive resin, which then needs to be immediately cured by UV light irradiation following the movement of the printhead.

[0004] However, existing follow-up curing systems integrated with the nozzle have at least the following technical problems: 1. Integrating heavier components such as the light source and heat dissipation unit into the printhead significantly increases the mass and inertia of the printhead's moving parts. During high-speed, high-acceleration printing, this enormous inertia can cause vibration and impact, affecting not only ejection and positioning accuracy but also limiting further increases in printhead speed, thus becoming a major obstacle to improving printing efficiency.

[0005] 2. The light source that moves with the printhead illuminates all areas along the entire scanning path. However, at any given moment, only the tiny area directly below the printhead where resin has been sprayed needs to be exposed. This "whole scan" method results in a huge waste of energy and causes unnecessary UV scattering of resin in non-forming areas of the resin tank, increasing the risk of pre-curing and potentially affecting the surface quality of the printed parts.

[0006] Therefore, there is an urgent need in this field for an innovative curing solution that can meet the needs of large-format printing while effectively addressing multiple challenges such as energy efficiency, curing uniformity, system inertia, and thermal management, thereby achieving high-speed, high-precision, and high-reliability 3D printing manufacturing. Summary of the Invention

[0007] In view of the technical problems in the background art, the purpose of this invention is to provide a partitioned exposure curing system and method for a photopolymer 3D printer, so as to achieve high-speed, high-precision, and high-reliability 3D printing manufacturing.

[0008] The technical solution is as follows: On one hand, this invention proposes a partitioned exposure curing system for a photopolymer 3D printer, comprising: The light track is a closed cavity arranged along the X-axis, with a slit light outlet at its bottom; A light source module is fixedly installed inside the cavity of the light track to generate a solidified light beam; A partitioned shutter group is set below the light outlet of the slit in the light track. The partitioned shutter group is divided into multiple independently controlled curing areas along the X-axis. The light beam output by the light source module is transmitted to the partitioned shutter group through the light track. A light energy constant control unit is set on or inside the light track, including a light intensity detection unit and a temperature detection unit, and is used to perform closed-loop feedback adjustment of the output power of the light source module. The control board module is electrically connected to the light source module, the partition shutter group, and the light energy constant control unit; The control board module is configured to communicate with the nozzle motion control system of the 3D printer, control the opening of the partition shutter of the corresponding curing area according to the real-time position of the nozzle of the 3D printer, and adjust the output power of the light source module based on the feedback signal of the light energy constant control unit to achieve uniform curing; the partition shutter group can adaptively adjust the opening time according to the nozzle scanning speed.

[0009] In addition, the above embodiments of the present invention may also have the following additional technical features: According to one embodiment of the present invention, a reflective layer is provided on the inner wall of the cavity enclosed by the optical track, forming a reflective shaping optical path to improve light energy utilization. By setting the reflective layer to form a reflective shaping optical path, stray light that might otherwise be absorbed by the cavity is efficiently collected and guided to the light outlet.

[0010] According to one embodiment of the present invention, the partitioned shutter group includes multiple parallel light-blocking plates, each of which is controlled to open and close via an independent electromagnetic drive unit to form an independent curing area. Electromagnetic drive has the advantages of fast response speed, simple control, low cost, and high driving force.

[0011] According to one embodiment of the present invention, the control board module controls the partition shutter group by opening only the partition shutters of one or more curing areas corresponding to the current position of the 3D printer nozzle, while keeping the partition shutters of the remaining curing areas closed. This minimizes energy waste and unnecessary resin irradiation.

[0012] According to one embodiment of the present invention, the light energy control unit includes a light intensity sensor and a temperature sensor. The control board module is configured to perform closed-loop adjustment based on the signal fed back by the light intensity sensor to stabilize the output light intensity, and to perform overheat protection based on the signal fed back by the temperature sensor. This improves the system output stability.

[0013] According to one embodiment of the present invention, a quartz lens or a composite reflective cavity made of a high ultraviolet reflectivity material is provided at the light exit port of the light track slit. The composite reflective cavity consists of an aluminum alloy reflective layer and a quartz protective sheet, which is used to prevent ultraviolet light leakage and constrain the light exit angle. This effectively prevents harmful ultraviolet light leakage, protects the equipment and operators, and also constrains the light exit angle, making the light spot more concentrated.

[0014] According to one embodiment of the present invention, the light track and its internal light source module are fixedly mounted as a whole on the gantry beam of the 3D printer, and are independently set from the nozzle of the 3D printer. This ensures that the system and the nozzle are in contact, guaranteeing motion accuracy.

[0015] On the other hand, this invention proposes a method for controlling the partitioned exposure curing of a photopolymer 3D printer, wherein the method is executed by the control board module of the partitioned exposure curing system as described above; the method includes the following steps: Step S1: Real-time acquisition of the current position coordinates and movement speed of the 3D printer nozzle; Step S2: Determine the target curing area corresponding to the nozzle based on the current position coordinates; Step S3: Generate control commands to open the shutter corresponding to the target curing area, while keeping the shutters of other curing areas closed. Step S4: Monitor the output light intensity and operating temperature of the light source module in real time; Step S5: Based on the monitored output light intensity, adjust the driving power of the light source module through closed-loop feedback to maintain a stable output light intensity; and based on the monitored operating temperature, implement an overheat protection strategy. In step S3, the opening duration of the partition shutter is adaptively adjusted according to the movement speed of the nozzle.

[0016] In one implementation, step S5, "adjusting the driving power of the light source module through closed-loop feedback," specifically includes: The monitored real-time light intensity value is compared with the preset target light intensity value; If the real-time light intensity value is lower than the target light intensity value, then increase the drive current or PWM duty cycle of the light source module; If the real-time light intensity value is higher than the target light intensity value, then reduce the drive current or PWM duty cycle of the light source module.

[0017] It achieves automation, real-time processing, and precision in light intensity regulation, ensuring the stability and response speed of the feedback control system.

[0018] In other implementations, step S3, "adaptively adjusting the opening duration of the partition shutter according to the movement speed of the nozzle," specifically means: The opening duration is inversely proportional to the movement speed to ensure that the exposure energy received by the resin per unit area below the printhead remains constant during scanning. This solves the problem of exposure fluctuations caused by changes in printing speed.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: By fixing the heavy light source module and heat dissipation system to an independent gantry beam, completely separating them from the moving print head, the moving mass of the print head is greatly reduced. This allows the print head to achieve higher motion acceleration and maximum speed, solving the technical defects of traditional follow-up light source systems in printing efficiency and helping to achieve high-speed, high-frequency reciprocating printing.

[0020] The zoned shutter system enables on-demand energy distribution, improving energy efficiency and reducing unnecessary exposure. It departs from the traditional long strip light source's overall illumination mode, achieving precise energy delivery. Only the tiny area being printed is exposed, while the vast majority of the area remains in darkness. This significantly reduces UV light scattering and diffuse reflection in non-forming resin areas of the resin tank, effectively lowering the risk of resin pre-curing and thus improving the surface quality of the printed parts. Furthermore, since non-printing areas do not require prolonged light exposure, overall heat accumulation in the resin tank is significantly reduced, minimizing resin thermal aging, yellowing, and viscosity drift, thereby improving material stability.

[0021] This application achieves improved printing speed, accuracy, quality, and system reliability primarily through the collaborative design of a fixed light source, zoned shutter, and automatic control system. Attached Figure Description

[0022] Figure 1 This is a system block diagram of a partitioned exposure curing system for a photopolymer 3D printer according to Embodiment 1 of the present invention; Figure 2 This is a simplified schematic diagram of the optical track-related parts in Embodiment 1 of the present invention; Figure 3 This is a flowchart of a partitioned exposure curing method for a photopolymer 3D printer according to Embodiment 2 of the present invention; The relevant markings in the attached diagram are: 1-light track, 2-light source module, 3-zone shutter group, 4-light energy constant control unit, 5-control board module; 11-reflective layer, 12-slit light outlet, 13-quartz lens, 31-light shield, 32-drive unit, 41-light intensity sensor, 42-temperature sensor. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1 See Figure 1 The present invention provides a partitioned exposure curing system for a photopolymer 3D printer, which mainly comprises: a light track 1, a light source module 2, a partitioned shutter group 3, a light energy constant control unit 4, and a control board module 5. Each module achieves signal communication and collaborative operation through the control board module.

[0025] The optical track 1, serving as the mechanical main body and optical cavity of the system, is horizontally positioned along the X-axis of the printer and fixedly mounted on the printer's gantry beam via a bracket. The light source module 2 is integrated inside the cavity of the optical track 1, specifically above the interior of the optical track. The partition shutter assembly 3 is installed below the optical track 1, close to its light outlet. The sensing part of the light energy constant control unit 4 is located inside the optical track 1 or near the light outlet, and its control part can be integrated with the control board module 5. The control board module 5 can be located inside the side panel of the printer frame, electrically connected to the above components via cables, and communicates in real time with the printer's main control system (especially the printhead motion control system).

[0026] See Figure 2 As shown, the light track 1 is a closed cavity extending along the X-axis. The cross-section of the closed cavity is preferably rectangular or trapezoidal. After precision polishing, the inner wall of the closed cavity is coated with a high reflectivity material layer, such as silver plating or a high reflectivity aluminum film, to form a reflective layer 11. The reflective layer 11 and the cavity structure together constitute a reflective shaping light path, which is used to limit the light output angle and improve the light energy utilization rate.

[0027] Its working principle is as follows: the light emitted by the light source module 2 is divergent. When the light shines on the reflective layer 11, it will be reflected multiple times according to the principle of specular reflection or diffuse reflection (depending on the surface treatment method) and guided to the slit light outlet 12 below. This design has the following advantages: First, it greatly improves the utilization rate of light energy and effectively collects and exports the light that might otherwise be absorbed and wasted by the cavity; Second, through careful optical design (such as designing the reflective surface with a specific curvature), the light can be shaped so that the light spot emitted from the slit light outlet 12 has a more uniform intensity distribution in the Y-axis direction (the width direction of the printing platform).

[0028] To prevent ultraviolet light leakage and constrain the light emission angle, a specialized protective structure is provided at the light emission port 12 of the slit. In a preferred embodiment, this structure is a quartz lens 13. Quartz has extremely high transmittance for ultraviolet light and can withstand the heat generated by long-term ultraviolet light irradiation. In another preferred embodiment, this structure is a composite reflective cavity, for example, composed of an aluminum alloy reflective layer and a quartz protective sheet. The aluminum alloy reflective layer is used to further guide the light, while the quartz protective sheet is used to seal the cavity, preventing dust from entering while allowing ultraviolet light to pass through efficiently. It should be noted that the width of the slit needs to be precisely controlled, typically between 1 and 3 millimeters, to balance the emitted light energy and the accuracy of area control.

[0029] The light source module 2 is fixedly installed inside the cavity of the optical track 1, typically located in the middle section of the cavity and extending along the X-axis. The core of the light source module 2 is the light-emitting unit. In this embodiment, the light-emitting unit preferably adopts an ultraviolet light-emitting diode array. LEDs have advantages such as long lifespan, fast response speed, pure spectrum, and easy modulation. Of course, the light source module can also be an LED array, a laser line source, or a mercury lamp source.

[0030] Multiple high-power UV-LED chips are integrated in high density on a long strip substrate (such as an aluminum substrate) to form a line light source. These LEDs can be arranged uniformly or non-uniformly according to the optical design requirements to compensate for possible light intensity non-uniformity. The back of the substrate can usually be in close contact with a heat sink (such as a heat pipe or liquid cooling plate) to dissipate the generated heat in time, ensuring that the LEDs work at a stable temperature and avoiding light decay.

[0031] The partition shutter group 3 is the execution component that realizes the functions of "partition exposure" and "energy on demand". The partition shutter group 3 is located directly below the slit light outlet 12 and is precisely divided into multiple independent curing areas along the X-axis.

[0032] Each independent curing area corresponds to a light-shielding plate 31 and a drive unit 32. The light-shielding plate 31 can be made of lightweight, high-strength and UV-resistant materials, such as thin stainless steel or special engineering plastics. The drive unit 32 is preferably an electromagnetic drive unit, such as a small solenoid. When the control board module 5 energizes the electromagnet, the generated magnetic force will attract or push the light-shielding plate 31 connected to it, thereby realizing the rapid action of "opening" and "closing". The drive unit 32 of each light-shielding plate 31 is independently controlled. The response speed of the partition shutter group can reach the millisecond level. Compared with the traditional curing lamp group that moves with the printhead (which has inertial limitations), it can achieve a higher frequency curing follow-up bandwidth, so that the curing position maintains accuracy during high-speed scanning, which is especially suitable for large-format high-speed inkjet printing.

[0033] The light energy control unit 4 is a feedback component that ensures consistent curing quality. It integrates a light intensity sensor 41 and a temperature sensor 42. The light intensity sensor 41 (such as a photodiode or photomultiplier tube) is placed in an appropriate position in the optical path. For example, a beam splitter can be set up to guide a small portion of the light to the sensor, or the sensor can be placed at a specific monitoring point on the inner wall of the light track. Its function is to monitor the intensity of the emitted light in real time. The temperature sensor 42 (such as a thermocouple or thermistor) is attached to the substrate or near the LED of the light source module 2 to monitor the operating temperature of the light source in real time. The light energy control unit can also share real-time parameters with the main control system through a communication interface so as to enable multi-machine linkage or adaptive adjustment of printing tasks.

[0034] The control board module is typically a printed circuit board based on a microprocessor (such as ARM or DSP). Its core function is to execute preset control logic algorithms, specifically including: ① Communication with the host computer: Communication with the printer via industrial fieldbuses such as CAN bus and EtherCAT. The main control system maintains real-time communication and receives the real-time position coordinates (X, Y) and movement speed commands of the nozzles; ②Zoned shutter control logic: The control board module 5 internally stores a mapping table between each area of ​​the zoned shutter group 3 and the X-axis position. When it receives the current position of the print head, it immediately calculates which curing area(s) the print head is above. Then, it sends an open signal to the drive unit 32 of the corresponding area, while the drive units 32 of other areas remain closed. This achieves precise exposure by "light following the print head".

[0035] ③ Adaptive opening time control: The control board module 5 can dynamically calculate and adjust the opening time of the partition shutter according to the real-time scanning speed of the print head. When the print head moves at high speed, the shutter opening time is shortened accordingly; when the print head moves at low speed or is refining a certain area, the opening time is extended accordingly. This ensures that the light energy (i.e., exposure) received per unit area remains consistent under different printing speeds. This is the key algorithm for achieving uniform curing.

[0036] ④ Light Energy Constant Control Logic (Closed-Loop Regulation): The control board module 5 continuously reads the voltage value fed back by the light intensity sensor 41 and compares it with the preset target light intensity value. If the feedback light intensity is lower than the target value, the control board module 5 will increase the drive current of the light source module 2 through PWM or current regulation, thereby increasing the output light intensity and stabilizing it near the target value, forming a closed-loop negative feedback control system. The reverse is also true.

[0037] ⑤ Overheat protection logic: The control board module 5 continuously monitors the reading of the temperature sensor 42. When the temperature exceeds the first safety threshold, it will reduce the power of the light source module 2 to reduce heat generation. When the temperature exceeds a higher danger threshold, it will directly shut down the output of the light source module 2 and alarm the host computer to protect the system hardware.

[0038] The workflow of the partitioned exposure curing system in this embodiment is as follows: 1. Initialization: The system is powered on, the control board module 5 completes self-test, and the printer main control system issues the print job.

[0039] 2. Start printing: The print head begins to move along the X-axis and sprays photosensitive resin. At the same time, the print head motion control system sends the real-time position coordinates and movement speed of the print head to the control board module 5 via the communication bus.

[0040] 3. Zone shutter control: Based on the received position information, the control board module 5 determines which curing area the print head is currently in; the control board module 5 sends a command to the electromagnetic drive unit 32 of the corresponding area to drive the light shield 31 of the corresponding area to open. At this time, the light emitted by the light source module 2 in the light track 1 can only shine onto the printing platform through the slit of the corresponding area; the light shields 31 in the area in front of the print head and the area behind the print head remain closed, and the light is blocked.

[0041] 4. Constant light energy control: During the exposure process, the light intensity sensor 41 monitors the light intensity emitted from area B in real time; the temperature sensor 42 monitors the temperature of the light source module 2 in real time; the monitoring data is fed back to the control board module 5 in real time; the control board module 5 runs a closed-loop control algorithm to dynamically adjust the driving power of the light source module 2 to ensure stable output light intensity. At the same time, it determines whether power limiting or overheat protection is needed based on the temperature data.

[0042] 5. Dynamic tracking: When the print head moves from the previous area to the adjacent next area, the control board module 5 will close the light shield 31 of the previous area and open the light shield 31 of the next area in time. This process is continuous, realizing seamless dynamic tracking and irradiation of the print head by the curing area.

[0043] 6. Printing complete: After one layer is printed, the printing platform descends by one layer thickness, and the system repeats steps 2-5 until the entire workpiece is printed.

[0044] This system also supports connecting multiple optical tracks in series for use in larger format devices, and the control board module can perform synchronous dimming of multiple optical tracks.

[0045] Example 2 See Figure 3 The flowchart shown below illustrates the partitioned exposure curing control method of this application. Each step will be explained in detail below with reference to the flowchart.

[0046] Step S100: System initialization. When the control board module 5 is powered on, it performs a hardware self-test, including checking whether the working status of the light source module 2, the drive units 32 of the partition shutter group 3, the light intensity sensor 41 and the temperature sensor 42 are normal. After initialization, the control board module 5 enters the standby state, waiting for the printer main control system to issue printing instructions.

[0047] Step S200: Acquire nozzle motion parameters in real time.

[0048] Once printing begins, the control board module 5 maintains real-time data exchange with the printer's main control system via a communication bus (such as a CAN bus). Its function is to continuously acquire the real-time position coordinates (X, Y) and instantaneous movement speed V of the print head, which is the basis for all subsequent control decisions.

[0049] Step S300: Determine the target curing area. The control board module 5 internally stores a "position-area" mapping table. After receiving the X coordinate of the print head, the control board module 5 immediately determines the specific curing area (i.e., the "target curing area") where the print head is currently located by querying this mapping table. For example, if the mapping table defines area B as X coordinates between 100mm and 120mm, and the current print head X coordinate is 105mm, then the target curing area is area B.

[0050] Step S400: Control the opening of the zone shutter and adaptively adjust the duration. The control board module 5 generates a drive command and sends it to the electromagnetic drive unit 32 corresponding to the target curing area (such as area B), so that it attracts the light shield 31 and opens the light path. At the same time, it ensures that the shutters of all other non-target areas remain closed.

[0051] Step S500: Real-time monitoring of light intensity and temperature. During the exposure process, the light energy control unit 4 works continuously. The light intensity sensor 41 converts the monitored light intensity signal into an electrical signal, and the temperature sensor 42 (such as a thermocouple) converts the monitored temperature value into an electrical signal. These signals are transmitted in real time to the analog-to-digital converter of the control board module 5 for processing.

[0052] Step S600: Closed-loop feedback regulation and overheat protection, comprising two aspects: a. Light intensity closed-loop adjustment (power stability): The control board module 5 compares the real-time light intensity value read in step S500 with the preset target light intensity value (determined by printing material and process parameters). Its adjustment strategy follows the classic closed-loop feedback control principle (PID or adaptive control can be used to make the algorithm protection more specific and facilitate the review of the control algorithm to perform light intensity closed-loop adjustment). If the real-time light intensity value is lower than the target value, it indicates that the light source output is insufficient. The control board module 5 will increase the drive current output to the light source module 2 or increase the duty cycle of the PWM signal to improve its brightness.

[0053] If the real-time light intensity value is higher than the target value, reduce the drive current or PWM duty cycle to decrease the brightness.

[0054] Through such real-time and dynamic adjustment, the interference of LED aging, voltage fluctuations, temperature changes and other factors on the output light intensity can be effectively overcome, and the light intensity can always be kept stable within the optimal range, improving the light energy utilization rate by more than 30%.

[0055] b. Temperature Monitoring and Overheat Protection (System Protection): Control board module 5 simultaneously monitors the temperature value and executes a graded protection strategy. Level 1 Warning: When the temperature exceeds the first threshold T1 (e.g., 60℃) but is below the danger threshold T2, control board module 5 may, while ensuring light intensity, moderately reduce the light source power or increase the cooling fan speed to suppress temperature rise. Level 2 Protection: When the temperature exceeds the danger threshold T2 (e.g., 80℃), control board module 5 will immediately force a reduction in light source power to a safe level, or directly shut down the light source output, and send an alarm message to the host computer to prevent hardware damage.

[0056] In summary, if an anomaly is detected, return to S200 to recalibrate the exposure time.

[0057] Step S700: Determine whether the nozzle has moved out of the current area. The control board module 5 continuously determines whether the print head is still within the current target curing area. As long as the print head has not moved out, it returns to steps S140 and S150 to continue maintaining the current shutter opening state and monitor and adjust the light intensity and temperature.

[0058] Step S800: Close the shutter of the current area and switch to the next area.

[0059] When the control board module 5 detects that the print head has moved out of the current target curing area (such as from area B to area C), it immediately generates a command to close the shutter of the current area (area B) and then jumps to step S120 to determine the newly entered area (area C) as the new target curing area and open its shutter; this cycle repeats until one layer of printing is completed or the entire printing task is finished.

[0060] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A partitioned exposure curing system for a photopolymer 3D printer, characterized in that, include: The light track is a closed cavity arranged along the X-axis, with a slit light outlet at its bottom; A light source module is fixedly installed inside the cavity of the light track to generate a solidified light beam; A partitioned shutter group is set below the light outlet of the slit in the light track. The partitioned shutter group is divided into multiple independently controlled curing areas along the X-axis. The light beam output by the light source module is transmitted to the partitioned shutter group through the light track. A light energy constant control unit is set on or inside the light track, including a light intensity detection unit and a temperature detection unit, and is used to perform closed-loop feedback adjustment of the output power of the light source module. The control board module is electrically connected to the light source module, the partition shutter group, and the light energy constant control unit; The control board module is configured to communicate with the nozzle motion control system of the 3D printer, control the opening of the partition shutter of the corresponding curing area according to the real-time position of the nozzle of the 3D printer, and adjust the output power of the light source module based on the feedback signal of the light energy constant control unit to achieve uniform curing. The zone shutter group can adaptively adjust the opening duration according to the printhead scanning speed.

2. The partitioned exposure curing system for a photopolymer 3D printer according to claim 1, characterized in that, The inner wall of the enclosed cavity of the optical track is provided with a reflective layer, which forms a reflective shaping optical path to improve the utilization rate of light energy.

3. The partitioned exposure curing system for a photopolymer 3D printer according to claim 1, characterized in that, The partitioned shutter group includes multiple parallel light-blocking plates, each of which is controlled by an independent electromagnetic drive unit to form an independent curing area.

4. The partitioned exposure curing system for a photopolymer 3D printer according to claim 1, characterized in that, The logic of the control board module in controlling the partition shutter group is as follows: only the partition shutter of one or more curing areas corresponding to the current position of the 3D printer nozzle is opened, while the partition shutters of the remaining curing areas remain closed.

5. The partitioned exposure curing system for a photopolymer 3D printer according to claim 1, characterized in that, The light energy constant control unit includes a light intensity sensor and a temperature sensor. The control board module is configured to perform closed-loop adjustment based on the signal fed back by the light intensity sensor to stabilize the output light intensity, and to perform overheat protection based on the signal fed back by the temperature sensor.

6. The partitioned exposure curing system for a photopolymer 3D printer according to claim 1, characterized in that, The light exit point of the light track is provided with a quartz lens or a composite reflective cavity made of a high ultraviolet reflectivity material. The composite reflective cavity consists of an aluminum alloy reflective layer and a quartz protective sheet, which is used to prevent ultraviolet light leakage and constrain the light exit angle.

7. The partitioned exposure curing system for a photopolymer 3D printer according to claim 1, characterized in that, The light track and the internal light source module are fixedly installed as a whole on the gantry beam of the 3D printer, and are set independently from the nozzle of the 3D printer.

8. A method for controlling the zoned exposure and curing of a photopolymer 3D printer, characterized in that, The method is performed according to the control board module of the partitioned exposure curing system as described in any one of claims 1 to 7; the method includes the following steps: Step S1: Real-time acquisition of the current position coordinates and movement speed of the 3D printer nozzle; Step S2: Determine the target curing area corresponding to the nozzle based on the current position coordinates; Step S3: Generate control commands to open the shutter corresponding to the target curing area, while keeping the shutters of other curing areas closed. Step S4: Monitor the output light intensity and operating temperature of the light source module in real time; Step S5: Based on the monitored output light intensity, adjust the driving power of the light source module through closed-loop feedback to maintain a stable output light intensity; and based on the monitored operating temperature, implement an overheat protection strategy. In step S3, the opening duration of the partition shutter is adaptively adjusted according to the movement speed of the nozzle.

9. A method for controlling the zoned exposure and curing of a photopolymer 3D printer according to claim 8, characterized in that, The step S5, "adjusting the driving power of the light source module through closed-loop feedback," specifically includes: The monitored real-time light intensity value is compared with the preset target light intensity value; If the real-time light intensity value is lower than the target light intensity value, then increase the drive current or PWM duty cycle of the light source module; If the real-time light intensity value is higher than the target light intensity value, then reduce the drive current or PWM duty cycle of the light source module.

10. A method for controlling the zoned exposure and curing of a photopolymer 3D printer according to claim 9, characterized in that, In step S3, "adaptively adjusting the opening duration of the partition shutter according to the movement speed of the nozzle" specifically means: The opening duration is inversely proportional to the movement speed to ensure that the exposure energy received by the resin per unit area below the nozzle remains constant during the scanning process.

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