A curing machine with adjustable light intensity

Abstract

This application belongs to the field of photocuring equipment technology, specifically an adjustable light intensity curing machine, including a worktable, a light source module, a controller, and a lifting and adjusting mechanism. The bearing surface of the worktable is completely within the maximum irradiation area of ​​the light source module. The controller is electrically connected to the light source module. The lifting and adjusting mechanism is used to drive the worktable to adjust its position in the vertical direction. It also includes a housing and a door hinged to the front of the housing. The door is made of UV-resistant material. The worktable can be translated along the Z-axis of the internal cavity of the housing. The light source module is located on the top of the housing, the controller is fixedly connected to the top of the housing, and the lifting and adjusting mechanism is located inside the housing. This application uses the cooperation of a controller and a constant current driver to adjust the output current to achieve light intensity adjustment within a wide range, ensuring consistent light energy in each curing process, thereby improving curing quality and yield.

Description

Technical Field

[0001] This application belongs to the field of light curing equipment technology, specifically a curing machine with adjustable light intensity. Background Technology

[0002] Curing machines, generally using ultraviolet light curing machines, work by using ultraviolet light to irradiate special adhesives or resins coated on the board, causing the adhesives or resins to undergo a polymerization reaction and thus achieve rapid curing. They are widely used in many fields such as dental restoration, electronic packaging, and 3D printing post-processing.

[0003] Currently, most common UV curing machines use fixed mercury lamps or LED arrays as light sources. These machines control the light source's on / off state and rely on fixed intensity levels, which has several drawbacks: First, the intensity adjustment method is simplistic and imprecise, unable to be tailored to the different materials of the objects to be cured, resulting in inconsistent curing effects and poor consistency in repetitive batch curing, affecting product quality. Second, some existing curing machines have a fixed worktable height, making it impossible to adjust the distance between the light source and the object according to its size, resulting in low operational flexibility. This limits the ability to concentrate energy for small, precision parts to improve curing efficiency, and also restricts the irradiation range for large-area coatings, limiting the equipment's applicability. Therefore, a curing machine with adjustable intensity is needed to address these issues. Utility Model Content

[0004] The purpose of this application is to address the shortcomings of existing technologies by designing an adjustable light intensity curing machine that uses a controller to calculate the required light intensity based on the preset type of object to be cured, thereby solving the problem of poor consistency in multiple batches of curing work.

[0005] To achieve the above objectives, the following technical solution is adopted: An adjustable light intensity curing machine includes a worktable, a light source module, a controller, and a lifting and adjusting mechanism; The bearing surface of the workbench is completely within the maximum irradiation area of ​​the light source module. The controller is electrically connected to the light source module, and the lifting and adjusting mechanism is used to drive the workbench to adjust its position in the vertical direction.

[0006] Preferably, it also includes a housing and a door hinged to the front of the housing. The door is made of a UV-resistant material. The workbench can be translated along the Z-axis of the internal cavity of the housing. The light source module is located on the top of the housing. The controller is fixedly connected to the top of the housing. The lifting and adjusting mechanism is located inside the housing.

[0007] Preferably, the light source module includes multiple ultraviolet LED beads and an aluminum-based PCB board. The multiple ultraviolet LED beads are arranged in a matrix on the bottom of the aluminum-based PCB board. The light source module emits ultraviolet light downward in a vertical direction. A heat sink is tightly attached to the top of the aluminum-based PCB board with thermal grease. The heat sink is positioned opposite to a cooling fan disposed on the inner wall of the housing.

[0008] Preferably, the light source module further includes a lampshade, which covers the ultraviolet LED beads, aluminum-based PCB board and heat sink. The lampshade is detachably installed on the top of the housing by means of fasteners. A ventilation slit is provided on the outer periphery of the lampshade along its length. A dustproof mesh is embedded in the inner wall of the ventilation slit. An opening is provided at the bottom of the lampshade.

[0009] Preferably, the controller is electrically connected to the ultraviolet LED beads via an independent constant current driver, and the top of the controller is equipped with a touch screen and operation buttons.

[0010] Preferably, it also includes a light intensity feedback sensor, which is fixed to the edge area of ​​the workbench and avoids the main irradiation area, with its photosensitive surface facing upward. The light intensity feedback sensor is electrically connected to the controller, and the light intensity feedback sensor is an ultraviolet-enhanced photoelectric sensor.

[0011] Preferably, it also includes a temperature sensor, the detection surface of which is attached to the non-component side of the aluminum-based PCB board, and the temperature sensor is electrically connected to the controller.

[0012] Preferably, the lifting and adjusting mechanism includes guide columns and screws symmetrically arranged inside the housing. The guide columns are vertically fixed to the inner wall of the housing, and the outer wall of the guide columns is slidably connected to the inner wall of the worktable. The surface of the worktable has an internally threaded hole that penetrates the worktable vertically. The screw passes through the worktable and is engaged with the internally threaded hole of the worktable. The screw is rotatably connected to the inner wall of the housing through a bearing seat, and a handwheel is fixedly connected to the top of the screw and extends to the outside of the housing.

[0013] Compared with the prior art, the beneficial effects of this application are: 1. This application uses a combination of a controller and a constant current driver, which can calculate the required light intensity according to the preset type of object to be cured. By adjusting the output current, the light intensity can be adjusted within a large range, ensuring that the light energy is consistent in each curing process, thus guaranteeing the consistency of multiple batches of curing work, thereby improving the curing quality and yield.

[0014] 2. This application uses a lifting and adjusting mechanism to adjust the height of the worktable in the vertical direction to match the required irradiation distance for objects of different sizes to be cured. For small precision parts, the distance of the light source can be reduced to concentrate energy and improve efficiency. For large-area coatings, the light source can be raised to expand the irradiation range, thereby improving the applicability and flexibility of the equipment and realizing flexible control of the irradiation area and unit light intensity. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure when the cabinet door is closed in this application; Figure 2 This is a schematic diagram showing the disassembly of the cabinet door when it is opened in this application; Figure 3 For this application Figure 2 Enlarged view of point A in the middle; Figure 4 This is a bottom view of the light source module in this application; Figure 5 This is a schematic diagram showing the disassembled light source module in this application; Figure 6 This is a split diagram of the light source module from another perspective in this application.

[0016] Among them, 10, cabinet; 11, cabinet door; 20, workbench; 30, light source module; 31, ultraviolet LED beads; 32, aluminum-based PCB board; 33, lampshade; 331, opening; 34, heat sink; 341, cooling fan; 35, ventilation seam; 41, controller; 42, temperature sensor; 43, light intensity feedback sensor; 44, constant current driver; 50, lifting and adjusting mechanism; 51, guide column; 52, screw; 53, handwheel. Detailed Implementation

[0017] Reference Figure 1 - Figure 6 An adjustable light intensity curing machine includes a worktable 20, a light source module 30, a controller 41, and a lifting and adjusting mechanism 50. The bearing surface of the workbench 20 is completely within the maximum irradiation area of ​​the light source module 30. The workbench 20 is used to support the object to be cured. It is made of quartz glass, which can withstand long-term high-intensity ultraviolet irradiation without yellowing or deformation, ensuring stable light transmittance so that the ultraviolet light can irradiate and cure the object. The controller 41 is electrically connected to the light source module 30. The controller 41 is used to adjust the driving current to change the light intensity of the light source module 30. The lifting adjustment mechanism 50 is used to drive the workbench 20 to adjust its position in the vertical direction. The lifting adjustment mechanism 50 is used to change the distance between the light source module 30 and the object to be cured on the workbench 20, thereby adjusting the irradiation area and the uniformity of light intensity distribution per unit area.

[0018] In this embodiment, during use, the object to be cured, such as an electronic component coated with adhesive, is placed on the worktable 20. The lighting parameters are set by the controller 41. For example, for a 3mm guide plate resin, the light intensity needs to be set to 350mW / cm² and the irradiation time to 20s. After setting, the controller 41 adjusts the driving current of the light source module 30 through the constant current driver 44 to achieve precise light intensity adjustment. At the same time, the height of the worktable 20 is adjusted by the lifting adjustment mechanism 50, allowing the user to adjust the height of the light source according to the thickness of the workpiece or the required light spot size to match the required irradiation distance for objects of different sizes. For example, for small precision parts, the light source distance can be reduced to concentrate energy and improve efficiency, while for large-area coatings, the light source distance can be increased to expand the coverage of the irradiation area, improve irradiation uniformity, and enhance the applicability and flexibility of the equipment.

[0019] As a preferred embodiment, the system also includes a housing 10 and a door 11 hinged to the front of the housing 10. The housing 10 forms the main support structure of the curing machine and has an internal chamber. A safety interlock switch, model STI T4012, is installed inside the door 11. When the door 11 is open, it sends a power-off signal to the controller 41 to immediately cut off the power supply to the light source module 30, preventing accidental UV exposure. The system is only allowed to start the curing program after the door 11 is completely closed. The door 11 is made of UV-resistant material to ensure that the operator is protected from UV radiation. The workbench 20 can be moved along the Z-axis of the internal chamber of the housing 10. The light source module 30 is located on the top of the housing 10. The controller 41 is fixedly connected to the top of the housing 10. The lifting and adjusting mechanism 50 is located inside the housing 10.

[0020] As a preferred embodiment, the light source module 30 includes multiple ultraviolet LED beads 31 and an aluminum-based PCB board 32. The multiple ultraviolet LED beads 31 are arranged in a matrix at the bottom of the aluminum-based PCB board 32. The light source module 30 emits ultraviolet light vertically downwards, emitting ultraviolet light with a main wavelength of 365nm or 395nm. A heat sink 34 is tightly attached to the top of the aluminum-based PCB board 32 with thermal grease. The heat sink 34 is opposite to a cooling fan 341 located on the inner wall of the housing 10. The cooling fan 341 is connected to the aluminum-based PCB board 32 for power supply via a power cord. During operation, it generates a large amount of heat, which is efficiently conducted to the metal heat sink 34 through the thermal grease. Then, the cooling fan 341, which is fixed to the inner wall of the housing 10, performs forced convection cooling, forming an active air cooling system. This ensures that the junction temperature of the ultraviolet LED beads 31 is below 85°C under continuous high-power operation, maintaining the stability of light output and avoiding wavelength shift or light intensity reduction due to temperature rise.

[0021] As a preferred embodiment, the light source module 30 also includes a lampshade 33 made of metal or flame-retardant engineering plastic. The lampshade 33 covers the ultraviolet LED beads 31, the aluminum-based PCB board 32, and the heat sink 34. The lampshade 33 is detachably mounted on the top of the housing 10 by means of fasteners. A ventilation slit 35 is provided along the length of the outer periphery of the lampshade 33. The inner wall of the ventilation slit 35 is embedded with a fine dustproof mesh with a pore size ≤50μm, which allows hot air to be discharged naturally by convection and prevents external dust from entering the light source area and contaminating the LED surface. An opening 331 is provided at the bottom of the lampshade 33. The ultraviolet radiation emitted by the ultraviolet LED beads 31 is emitted downward through the opening 331. All ultraviolet radiation is emitted downward through this opening, avoiding lateral light leakage that may affect surrounding equipment.

[0022] As a preferred embodiment, the controller 41 is electrically connected to the UV LED bead 31 via an independent constant current driver 44. The controller 41 has a touch screen and operation buttons on its top for inputting curing time, light intensity level, and start and stop commands. The controller 41 has built-in templates for various curing process parameters, such as guide plate resin, epoxy resin, and photosensitive resin. After the user sets the type of material to be cured via the touch screen, the controller 41 calls up the corresponding standard light intensity and time curves and outputs a PWM dimming signal to the constant current driver 44 through a built-in PID algorithm. This controls the constant current driver 44 to adjust the output current linearly within the range of 100mA to 500mA, thereby achieving the adjustment of light intensity between 300mW / cm² and 1500mW / cm².

[0023] As a preferred embodiment, a light intensity feedback sensor 43 is also included. The light intensity feedback sensor 43 is fixed to the edge area of ​​the worktable 20 and avoids the main irradiation area. Its photosensitive surface is arranged facing upwards to receive ultraviolet light emitted downwards from the light source module 30. The light intensity feedback sensor 43 is electrically connected to the controller 41 to detect the actual ultraviolet light intensity received by the worktable 20 at the current position in real time and feed the signal back to the controller 41. The controller 41 dynamically adjusts the duty cycle of the PWM drive signal according to the deviation between the detected value and the set value to realize closed-loop control of the light intensity. The light intensity feedback sensor 43 is an ultraviolet-enhanced photoelectric sensor, model GUVA-S12SD, with a response wavelength range of 250nm to 450nm, covering the UVA, UVB and part of the UVC bands, and is equipped with a quartz glass protective cover to prevent organic volatiles from contaminating the sensor surface.

[0024] As a preferred embodiment, a temperature sensor 42 is also included. The temperature sensor 42 is attached to the non-component side of the aluminum-based PCB board 32 and is a platinum resistance PT100 sensor used to monitor the LED junction temperature. The temperature sensor 42 is electrically connected to the controller 41. During the curing process, the controller 41 corrects the PWM duty cycle in a closed loop based on the feedback signals from the light intensity feedback sensor 43 and the temperature sensor 42, so that the deviation between the actual light intensity and the set light intensity is ≤±3%. The controller 41 has a built-in temperature and light decay compensation algorithm model. Since the LED will experience light decay due to temperature rise, when the temperature sensor 42 detects that the temperature rise rate of the aluminum-based PCB board exceeds the preset threshold, the controller 41 increases the PWM duty cycle in advance to offset the expected light intensity decrease trend, ensuring that the light energy is consistent in each curing process, thereby ensuring the consistency of multiple batches of curing work.

[0025] As a preferred embodiment, the lifting and adjusting mechanism 50 includes guide columns 51 and screws 52 symmetrically arranged inside the housing 10. The guide columns 51 are vertically fixed to the inner wall of the housing 10, and the outer wall of the guide columns 51 is slidably connected to the inner wall of the worktable 20. A sliding sleeve is fixedly connected to the inner wall of the worktable 20, and the sliding sleeve is sleeved on the outer periphery of the guide columns 51 to form a sliding fit. Linear bearings are provided on both sides of the worktable 20, which are sleeved on the guide columns 51 to achieve smooth sliding. A vertical through-hole is formed on the surface of the worktable 20. The screw 52 passes through the internal threaded hole of the worktable 20 and is connected to the internal threaded hole of the worktable 20. The screw 52 is rotatably connected to the inner wall of the housing 10 through the bearing seat. The top of the screw 52 and the handwheel 53 extending to the outside of the housing 10 are fixedly connected to the handwheel 53, which is used to manually rotate and drive the worktable 20 to slide up and down along the guide post 51. Rotating the handwheel 53 outside the housing 10 drives the screw 52 to rotate. Since the two ends of the screw 52 are limited by the bearing seat and cannot move axially, the worktable 20 is driven to move up and down along the Z-axis.

Claims

1. A curing machine with adjustable light intensity, characterized in that, It includes a worktable (20), a light source module (30), a controller (41), and a lifting and adjusting mechanism (50); The bearing surface of the workbench (20) is completely within the maximum irradiation area of ​​the light source module (30). The controller (41) is electrically connected to the light source module (30). The lifting adjustment mechanism (50) is used to drive the workbench (20) to adjust its position in the vertical direction.

2. The adjustable intensity curing light of claim 1, wherein: It also includes a housing (10) and a door (11) hinged to the front of the housing (10). The door (11) is made of UV-resistant material. The workbench (20) can be translated along the Z-axis of the internal cavity of the housing (10). The light source module (30) is located on the top of the housing (10). The controller (41) is fixedly connected to the top of the housing (10). The lifting adjustment mechanism (50) is located inside the housing (10).

3. The adjustable intensity curing light of claim 1, wherein: The light source module (30) includes multiple ultraviolet LED beads (31) and an aluminum-based PCB board (32). The multiple ultraviolet LED beads (31) are arranged in a matrix at the bottom of the aluminum-based PCB board (32). The light source module (30) emits ultraviolet light downward in a vertical direction. The top of the aluminum-based PCB board (32) is tightly attached to a heat sink (34) with thermal grease. The heat sink (34) is arranged opposite to a cooling fan (341) set on the inner wall of the housing (10).

4. The intensity adjustable curing machine of claim 3, wherein: The light source module (30) also includes a lampshade (33), which covers the outside of the ultraviolet LED beads (31), the aluminum-based PCB board (32) and the heat sink (34). The lampshade (33) is detachably installed on the top of the housing (10) by means of a fastener. A ventilation slit (35) is provided on the outer periphery of the lampshade (33) along the length extension direction. A dustproof mesh is embedded in the inner wall of the ventilation slit (35). An opening (331) is provided at the bottom of the lampshade (33).

5. The adjustable intensity curing light of claim 1, wherein: The controller (41) is electrically connected to the ultraviolet LED beads (31) via an independent constant current driver (44), and the top of the controller (41) is equipped with a touch screen and operation buttons.

6. The adjustable intensity curing light of claim 1, wherein: It also includes a light intensity feedback sensor (43), which is fixed to the edge area of ​​the workbench (20) and avoids the main irradiation area. Its photosensitive surface is arranged facing upwards. The light intensity feedback sensor (43) is electrically connected to the controller (41). The light intensity feedback sensor (43) is an ultraviolet-enhanced photoelectric sensor.

7. The adjustable intensity curing light of claim 1, wherein: It also includes a temperature sensor (42), the detection surface of which is attached to the non-component side of the aluminum-based PCB board (32), and the temperature sensor (42) is electrically connected to the controller (41).

8. The intensity adjustable curing machine of claim 1, wherein: The lifting adjustment mechanism (50) includes a guide column (51) and a screw (52) symmetrically arranged inside the housing (10). The guide column (51) is vertically fixed to the inner wall of the housing (10). The outer wall of the guide column (51) is slidably connected to the inner wall of the worktable (20). The surface of the worktable (20) is provided with an internal threaded hole that penetrates the worktable (20). The screw (52) penetrates the worktable (20) and is engaged with the internal threaded hole of the worktable (20). The screw (52) is rotatably connected to the inner wall of the housing (10) through a bearing seat. A handwheel (53) is fixedly connected to the top of the screw (52) and extends to the outside of the housing (10).

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