Non-contact dispensing device for optical fibers

Abstract

This invention relates to the field of automation equipment technology and discloses a non-contact optical fiber dispensing device, comprising a base, a gantry moving assembly at the top of the base, a feeding assembly at the rear of the gantry moving assembly, a tooling fixture base on the upper side of the base, a vacuum adsorption assembly inside the tooling fixture base, a moving seat on the upper side of the tooling fixture base, an injector mounted on the moving seat, a curing assembly on the left side of the injector, and a mounting bracket including a mounting bracket. A laser contour sensor is mounted on the front of the mounting bracket, and a focus driver is mounted inside the mounting bracket. This invention, through synchronous dynamic compensation of focus and power, ensures that changes in the spot area caused by changes in Z-axis height are offset by changes in power, thus maintaining a constant actual energy density of the curing lamp on the workpiece surface and solving the problem of uneven curing caused by workpiece surface undulations.

Description

Technical Field

[0001] This invention relates to the field of automation equipment technology, specifically to a non-contact optical fiber dispensing device. Background Technology

[0002] In precision manufacturing fields such as electronic packaging, optical devices, and medical devices, non-contact dispensing followed by UV (ultraviolet) curing is a widely used process. In traditional production methods, the dispensing process and UV curing are usually two separate workstations or steps. This allows the adhesive sufficient time to flow, spread, or deform before curing, resulting in poor final molding accuracy and low consistency.

[0003] To address this issue, some existing technologies integrate UV curing functionality into the dispensing head. These devices typically utilize flexible optical fibers to transmit UV light energy to an irradiation head near the dispensing nozzle, enabling on-demand curing. This has proven effective when processing planar workpieces. However, when processing warped planar workpieces or three-dimensional workpieces with complex 3D contours, the relative position between the fiber optic output and the workpiece surface fluctuates drastically with changes in the Z-axis height of the workpiece surface. For the light beam transmitted through the fiber and output via a lens, this distance variation causes instability in the beam's projection onto the workpiece surface, resulting in UV spot defocusing, significant energy attenuation, a sharp decline in curing effectiveness, and even complete failure.

[0004] To address this challenge, more advanced equipment has introduced automatic focusing systems that adjust the optical focal length of the fiber optic output head in real time using methods such as laser ranging, attempting to ensure that the light spot is always clearly focused on the uneven surface of the three-dimensional workpiece. However, this focusing-only solution overlooks a more subtle physical defect: according to optical principles, changes in focal length inevitably lead to changes in the spot area (i.e., magnification). When the focal length is lengthened to accommodate the distant surface of a recessed area on a three-dimensional workpiece, the spot area output by the fiber increases; conversely, when accommodating a raised surface, the spot area decreases. Assuming a constant UV-LED output power, the light energy originating from the fiber end face is projected onto areas of varying sizes, directly causing fluctuations in the actual energy density acting on the workpiece surface. This inconsistency in energy density can lead to over-curing (potentially causing material embrittlement or discoloration) or under-curing (affecting adhesion and performance) at different locations on the three-dimensional workpiece, severely impacting product quality and reliability in high-precision manufacturing.

[0005] Therefore, the present invention provides a non-contact optical fiber dispensing device to overcome the shortcomings of the prior art. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a non-contact optical fiber dispensing device, which solves the problem of inconsistent UV energy density caused by changes in workpiece height and optical focusing during synchronous dispensing and curing of workpieces with complex three-dimensional contours, leading to inconsistent curing quality.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a non-contact optical fiber dispensing device, comprising a device base, a gantry moving assembly at the top of the device base, a feeding assembly at the rear of the gantry moving assembly, a tooling fixture substrate on the upper side of the device base, a vacuum adsorption assembly inside the tooling fixture substrate, a moving seat on the upper side of the tooling fixture substrate, an injector mounted on the moving seat, a curing assembly on the left side of the injector, the curing assembly including a mounting bracket, a laser contour sensor mounted at the front of the mounting bracket, a focus driver mounted inside the mounting bracket, a focusing optical module mounted at the bottom of the mounting bracket, a curing lamp mounted inside the focusing optical module, a programmable power supply mounted at the top of the mounting bracket, a dispensing valve mounted at the top of the injector, and a main controller mounted on the right side of the device base;

[0008] The main controller is configured as follows:

[0009] Based on the Z-axis height data detected in real time by the laser contour sensor, the focal length and power parameters are determined.

[0010] Simultaneously control the focal length driver and the programmable power supply to adjust the focal length of the focusing optical module and the output power of the curing lamp, thereby compensating for changes in the spot area and keeping the actual energy density of the curing lamp on the workpiece surface constant.

[0011] Preferably, the main controller is configured as follows:

[0012] Real-time acquisition of Z-axis height data of the workpiece surface along the dispensing path, detected by the laser contour sensor;

[0013] Based on the Z-axis height data, the internally stored three-dimensional compensation lookup table for height, focal length, and power is queried to determine the focal length and power parameters corresponding to the current height.

[0014] Simultaneously, two independent control commands are issued: the focal length parameter is sent to the focal length driver to control the focusing optical module to adjust the focal length of the curing lamp in real time to ensure that the light spot is clearly focused on the workpiece surface; the power parameter is sent to the programmable power supply to adjust the output power of the curing lamp in real time and linearly.

[0015] Through the synchronous dynamic compensation of focal length and power, the change in spot area caused by the change in Z-axis height is ensured to be offset by the change in power, thereby keeping the actual energy density of the curing lamp on the workpiece surface constant throughout the entire dispensing and curing process.

[0016] Preferably, the gantry moving assembly includes a Y-axis linear guide rail, which is mounted on the equipment base. A Y-axis slider is slidably connected to the Y-axis linear guide rail. A crossbeam is fixedly connected to the top of the Y-axis slider. An X-axis linear guide rail is fixedly connected to the inner side of the crossbeam. A movable seat is slidably connected to the X-axis linear guide rail. One end of a drag chain is fixedly connected to the rear side of the movable seat. The other end of the drag chain is fixedly connected to the crossbeam. A Z-axis linear guide rail is mounted on the inner side of the crossbeam. A Z-axis slider is slidably connected to the outer side of the Z-axis linear guide rail. The movable seat is mounted on the front side of the Z-axis slider.

[0017] Preferably, the feeding assembly includes a conveyor belt, which is located on the rear side of the gantry moving assembly. A support frame is installed on the conveyor belt, and an industrial camera is installed at the bottom of the support frame. A robotic arm is installed on the right side of the conveyor belt, and a gripper is fixedly connected to the output end of the robotic arm. A workpiece recycling bin is provided inside the equipment base, and the workpiece recycling bin is located at the tail end of the conveyor belt.

[0018] Preferably, the vacuum adsorption assembly includes a vacuum channel disposed inside the tooling fixture substrate and an adsorption hole communicating with the vacuum channel. A vacuum interface is fixedly connected to the rear side of the tooling fixture substrate. A vacuum tube is fixedly connected to the side of the vacuum interface away from the tooling fixture substrate. A vacuum generator is fixedly connected to the vacuum tube away from the vacuum interface. The vacuum generator is mounted on the equipment base and is disposed in front of the pressure gauge.

[0019] Preferably, the vacuum interface is fixedly connected to the vacuum channel on the tooling fixture base plate.

[0020] Preferably, a base plate guide rail is mounted on the top of the equipment base, and the top of the base plate guide rail is fixedly connected to the bottom of the tooling fixture base plate.

[0021] Preferably, the main controller is also electrically connected to the feeding assembly, and the main controller is further configured to: control the robotic arm to grasp the workpiece on the conveyor belt and place it on the tooling fixture base plate based on the image signal acquired by the industrial camera.

[0022] Preferably, the focusing optical module includes a fixed optical path element, a liquid lens, and a liquid lens driver;

[0023] The ultraviolet light emitted by the curing lamp passes sequentially through the fixed optical path element and the liquid lens;

[0024] The focal length driver is used to receive the focal length parameter command and directly drive the liquid lens.

[0025] Preferably, a precision air pressure controller is installed on the equipment base. The precision air pressure controller is electrically connected to the main controller and connected to the air circuit of the dispensing valve. It is used to adjust the spray pressure of the dispensing valve according to the instructions of the main controller. The movable base is equipped with a pressure gauge for real-time monitoring and display of the air circuit pressure supplied to the dispensing valve.

[0026] This invention provides a non-contact optical fiber dispensing device. It has the following beneficial effects:

[0027] 1. This invention utilizes a laser contour sensor, a focusing optical module, a programmable power supply, and a main controller equipped with a three-dimensional compensation lookup table to work together to detect the Z-axis height of the workpiece in real time and dynamically adjust the focal length and output power of the curing lamp simultaneously. This ensures a constant UV light energy density on the surface of workpieces with complex 3D contours. This fundamentally solves the technical problems of uneven curing, over-curing, or under-curing caused by workpiece undulations, greatly improving the curing quality, reliability, and yield of the product.

[0028] 2. This invention integrates the dispensing valve and the curing component with automatic focusing function onto the same moving base, achieving simultaneous dispensing and curing. This effectively prevents the adhesive from flowing or deforming before curing, ensuring the precision of the dispensing process. Simultaneously, the automatic focusing function allows it to adapt to warped or three-dimensional workpieces, significantly expanding the equipment's application range and enabling it to handle complex processing tasks that traditional planar dispensing and curing equipment cannot accomplish.

[0029] 3. This invention, by setting up a feeding component, a vision positioning system, and a vacuum adsorption component, and centrally scheduling them with a main controller, achieves full automation from workpiece feeding, precise positioning, and secure clamping to processing completion. This significantly reduces manual intervention and substantially improves production efficiency and processing stability. Compared with traditional manual or semi-automatic equipment, this invention reduces labor costs and human error rates, achieving higher efficiency and more reliable continuous production. Attached Figure Description

[0030] Figure 1 This is a perspective view of the present invention;

[0031] Figure 2 This is a rear view of the present invention;

[0032] Figure 3 This is a schematic diagram of the feeding assembly structure of the present invention;

[0033] Figure 4This is a partial structural diagram of the present invention;

[0034] Figure 5 This is a schematic diagram of the vacuum adsorption component structure of the present invention;

[0035] Figure 6 This is a schematic diagram of the vacuum flow channel structure of the present invention;

[0036] Figure 7 This is a schematic diagram of the curing component structure of the present invention;

[0037] Figure 8 This is a schematic diagram of the constant energy density curing system of the present invention.

[0038] The components include: 1. Equipment base; 2. X-axis linear guide rail; 3. Crossbeam; 4. Y-axis linear guide rail; 5. Z-axis linear guide rail; 6. Cable chain; 7. Moving seat; 8. Loading assembly; 81. Conveyor belt; 82. Industrial camera; 83. Support frame; 84. Robotic arm; 85. Gripper; 86. Workpiece recovery bin; 9. Dispensing valve; 10. Injector; 11. Precision air pressure controller; 12. Pressure gauge; 13. Tooling fixture base plate; 14. Vacuum adsorption assembly; 141. Vacuum flow channel; 142. Adsorption hole; 143. Vacuum interface; 144. Vacuum generator; 145. Vacuum tube; 15. Curing assembly; 151. Mounting bracket; 152. Laser contour sensor; 153. Curing lamp; 154. Focusing optical module; 155. Focus driver; 156. Programmable power supply; 16. Main controller; 17. Base plate guide rail. Detailed Implementation

[0039] The technical solutions in 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.

[0040] Please see the appendix Figure 1 - Appendix Figure 7This invention provides a non-contact optical fiber dispensing device, including a base 1, a gantry moving assembly on the top of the base 1, a feeding assembly 8 on the rear side of the gantry moving assembly, a fixture base plate 13 on the upper side of the base 1, a base plate guide rail 17 mounted on the top of the base 1, the top of the base plate guide rail 17 being fixedly connected to the bottom of the fixture base plate 13, a vacuum adsorption assembly 14 inside the fixture base plate 13, a movable seat 7 on the upper side of the fixture base plate 13, and an injection unit mounted on the movable seat 7. The device 10 has a curing component 15 on its left side. The curing component 15 includes a mounting bracket 151. A laser contour sensor 152 is mounted on the front of the mounting bracket 151. A focus driver 155 is installed inside the mounting bracket 151. A focusing optical module 154 is mounted on the bottom of the mounting bracket 151. A curing lamp 153 is installed inside the focusing optical module 154. A programmable power supply 156 is mounted on the top of the mounting bracket 151. A dispensing valve 9 is mounted on the top of the syringe 10. A main controller 16 is mounted on the right side of the device base 1.

[0041] The main controller 16 is configured as follows:

[0042] Based on the Z-axis height data detected in real time by the laser profile sensor 152, the focal length and power parameters are determined.

[0043] Simultaneously control the focus driver 155 and the programmable power supply 156 to adjust the focal length of the focusing optical module 154 and the output power of the curing lamp 153, thereby compensating for changes in the spot area and keeping the actual energy density of the curing lamp 153 on the workpiece surface constant.

[0044] Specifically, the main controller 16 is the core control unit of this device, which controls all automated components such as the gantry moving assembly, the feeding assembly 8, the vacuum adsorption assembly 14, and the curing assembly 15 via electrical connections. During the dispensing and curing operation, the main controller 16 achieves the core function of this invention: constant energy density curing.

[0045] As the moving seat 7 moves along the workpiece surface, the laser contour sensor 152, mounted on the front of the mounting bracket 151, continuously scans the workpiece surface in front of the dispensing path, acquiring high-precision Z-axis height data in real time and feeding it back to the main controller 16 in milliseconds. Upon receiving the Z-axis height data, the main controller 16 immediately queries a pre-calibrated 3D compensation lookup table stored internally, instantly calculating the optimal focal length and required power parameters corresponding to the current height. Immediately afterward, the main controller 16 simultaneously issues two independent control commands: on one hand, it sends the focal length parameters to the focal length driver 155 installed inside the mounting bracket 151, which controls the focusing optical module 154 at the bottom of the mounting bracket 151 to adjust the focal length in real time, ensuring that the UV light spot emitted by the curing lamp 153 is always clearly focused on the workpiece surface; on the other hand, it sends the power parameters to the programmable power supply 156 at the top of the mounting bracket 151, adjusting the output power of the curing lamp 153 in real time and linearly. The purpose of this power compensation is to counteract the change in spot area caused by the change in focal length (change in optical magnification), thereby ensuring the actual energy density (unit: W / cm²) ultimately projected onto the workpiece surface. 2 The curing process remains constant throughout the entire dispensing process, completely solving the problem of uneven curing or damage caused by workpiece undulations.

[0046] The gantry moving assembly includes a Y-axis linear guide rail 4, which is mounted on the equipment base 1. A Y-axis slider is slidably connected to the Y-axis linear guide rail 4. A crossbeam 3 is fixedly connected to the top of the Y-axis slider. An X-axis linear guide rail 2 is fixedly connected to the inner side of the crossbeam 3. A moving seat 7 is slidably connected to the X-axis linear guide rail 2. One end of a drag chain 6 is fixedly connected to the rear side of the moving seat 7. The other end of the drag chain 6 is fixedly connected to the crossbeam 3. A Z-axis linear guide rail 5 is mounted on the inner side of the crossbeam 3. A Z-axis slider is slidably connected to the outer side of the Z-axis linear guide rail 5. The moving seat 7 is mounted on the front side of the Z-axis slider.

[0047] Specifically, during operation, the main controller 16 loads a preset workpiece processing path file. First, the main controller 16 controls the Y-axis linear guide rail 4 to drive the Y-axis slider, causing the entire beam 3 to move back and forth along the Y-axis on the equipment base 1, achieving a wide range of workstation switching or processing area positioning. Simultaneously, it controls the X-axis linear guide rail 2 to drive the moving seat 7 to move left and right along the X-axis on the beam 3; and it controls the Z-axis linear guide rail 5 inside the moving seat 7 to drive the Z-axis slider, achieving precise up and down Z-axis lifting of the moving seat 7. Through precise servo and interpolation movements of the X, Y, and Z axes, the main controller 16 drives the moving seat 7, which is equipped with the syringe 10 and curing component 15, enabling it to perform high-speed, smooth, and precise dispensing and synchronous curing operations on the workpiece surface along any complex three-dimensional spatial path. During this process, the cable chain 6 extends and retracts with the movement of the moving seat 7 along the X and Y axes, providing a stable and protected power and signal transmission channel for the dispensing valve 9, curing component 15, and other actuators on the moving seat 7.

[0048] The feeding assembly 8 includes a conveyor belt 81, which is located on the rear side of the gantry moving assembly. A support frame 83 is installed on the conveyor belt 81, and an industrial camera 82 is installed at the bottom of the support frame 83. A robotic arm 84 is installed on the right side of the conveyor belt 81, and a gripper 85 is fixedly connected to the output end of the robotic arm 84. A workpiece recovery bin 86 is provided inside the equipment base 1, and the workpiece recovery bin 86 is located at the tail end of the conveyor belt 81.

[0049] Specifically, at the start of the workflow, the workpiece is automatically fed in by the conveyor belt 81. When the workpiece moves into the field of view of the industrial camera 82 below the support frame 83, the sensor triggers the industrial camera 82 to take a picture and send the real-time image signal of the workpiece to the main controller 16. The visual recognition algorithm of the main controller 16 immediately processes the image, compares it with the pre-stored standard workpiece template, and accurately calculates the deviation of the workpiece's planar coordinates X, Y and rotation angle R on the conveyor belt 81. Based on this deviation data, the main controller 16 corrects the gripping coordinates of the robotic arm 84 in real time and directs the robotic arm 84 to drive the gripper 85 to accurately grip the workpiece in the compensated posture. Subsequently, the robotic arm 84 transfers the workpiece and accurately places it on the preset processing origin of the tooling fixture base plate 13. After the glue curing operation is completed, the main controller 16 again directs the robotic arm 84 to grip the processed finished product and put it into the workpiece recycling bin 86 inside the equipment base 1, and then starts the next feeding cycle, realizing truly fully automated production.

[0050] The vacuum adsorption assembly 14 includes a vacuum channel 141 disposed inside the tooling fixture base plate 13 and an adsorption hole 142 communicating with the vacuum channel 141. A vacuum interface 143 is fixedly connected to the rear side of the tooling fixture base plate 13. A vacuum tube 145 is fixedly connected to the side of the vacuum interface 143 away from the tooling fixture base plate 13. A vacuum generator 144 is fixedly connected to the vacuum tube 145 away from the vacuum interface 143. The vacuum generator 144 is mounted on the equipment base 1 and is disposed in front of the pressure gauge 12. The vacuum interface 143 is fixedly connected to the vacuum channel 141 on the tooling fixture base plate 13.

[0051] Specifically, the vacuum adsorption assembly 14 provides rigid fixation for the workpiece during high-speed movement. Its operating logic is a closed-loop control process: when the robotic arm 84 places the workpiece on the surface of the fixture substrate 13 and covers the adsorption hole 142, the main controller 16 issues a command to start the vacuum generator 144. The negative pressure generated by the vacuum generator 144 rapidly draws air from the vacuum channel 141 inside the fixture substrate 13 through the vacuum tube 145 and vacuum interface 143. Due to the atmospheric pressure difference, the bottom surface of the workpiece is firmly pressed against the substrate surface where the adsorption hole 142 is located. The key is that the vacuum generator 144 or pipeline usually integrates a vacuum pressure switch or sensor. This sensor feeds back the real-time vacuum signal to the main controller 16. The main controller 16 sets a vacuum threshold (e.g., -60kPa). Only when the detected vacuum reaches this threshold and the workpiece is confirmed to have been successfully and firmly adsorbed will the main controller 16 release the gripper 85 of the robotic arm 84 and allow it to withdraw. Only then will the high-speed dispensing program be executed. This ensures that the workpiece will never experience any slight displacement due to vibration or acceleration during processing, thus guaranteeing processing accuracy.

[0052] A precision air pressure controller 11 is installed on the equipment base 1. The precision air pressure controller 11 is electrically connected to the main controller 16 and connected to the air circuit of the dispensing valve 9. It is used to adjust the spray pressure of the dispensing valve 9 according to the instructions of the main controller 16. A pressure gauge 12 is installed on the movable base 7 to monitor and display the air circuit pressure supplied to the dispensing valve 9 in real time.

[0053] Specifically, during dispensing, the main controller 16 first sends an analog or digital command (e.g., 4-20mA or RS485 signal) to the precision pneumatic controller 11 based on the current process (e.g., adhesive viscosity, temperature, and desired dot diameter). The precision pneumatic controller 11 is a closed-loop regulator that precisely reduces the pressure of the factory's high-pressure air source and stably outputs a pressure with extremely low fluctuations (e.g., 0.1-0.5MPa). This pressure is applied to the dispensing valve 9 through the air path to push the adhesive in the syringe 10, ensuring that the adhesive is always ready to be dispensed. Subsequently, the main controller 16 sends a high-frequency pulse trigger signal to the actuator (typically a piezoelectric ceramic or high-speed electromagnetic coil) of the dispensing valve 9 according to the speed and dispensing volume requirements of the dispensing path. Each time the dispensing valve 9 receives a pulse, its internal striking pin or diaphragm opens and closes instantaneously (typically on the order of milliseconds), using the inertia of the fluid to eject a tiny droplet of adhesive. The pressure gauge 12 is mounted on the movable base 7, near the air inlet of the dispensing valve 9. It is used to display the driving air pressure set by the precision air pressure controller 11 in real time and intuitively, so that the operator can debug the equipment or troubleshoot the fault in case of pressure abnormality (such as blockage or leakage), thereby ensuring the high consistency and stability of the volume of the sprayed glue dots.

[0054] Reference Appendix Figure 8 The main controller 16 is configured as follows:

[0055] Real-time acquisition of Z-axis height data of the workpiece surface along the dispensing path, detected by laser contour sensor 152;

[0056] Based on the Z-axis height data, query the internally stored 3D compensation lookup table for height, focal length, and power to determine the focal length and power parameters corresponding to the current height;

[0057] At the same time, two independent control commands are issued: the focal length parameter is sent to the focal length driver 155 to control the focusing optical module 154 to adjust the focal length of the curing lamp 153 in real time to ensure that the light spot is clearly focused on the workpiece surface; the power parameter is sent to the programmable power supply 156 to adjust the output power of the curing lamp 153 in real time and linearly.

[0058] The focusing optical module 154 includes fixed optical path elements, a liquid lens, and a liquid lens driver;

[0059] The ultraviolet beam emitted by the curing lamp 153 passes sequentially through the fixed optical path element and the liquid lens;

[0060] The focal length driver 155 is used to receive the focal length parameter command and directly drive the liquid lens.

[0061] Through the synchronous dynamic compensation of focal length and power, the change in spot area caused by the change in Z-axis height is ensured to be offset by the change in power, thereby keeping the actual energy density of the curing lamp 153 on the workpiece surface constant throughout the dispensing and curing process.

[0062] The main controller 16 is also electrically connected to the feeding assembly 8. The main controller 16 is further configured to control the robotic arm 84 to grab the workpiece on the conveyor belt 81 and place it on the tooling fixture base plate 13 based on the image signal collected by the industrial camera 82.

[0063] Specifically, firstly, during the automatic feeding stage, the main controller 16 executes the vision-guided robot VGR algorithm. When the workpiece enters the field of view of the industrial camera 82 along with the conveyor belt 81, the camera triggers image capture and upload. The main controller 16 then uses image processing algorithms to identify the precise position of the workpiece in the conveyor belt's planar coordinate system. and deflection angle Subsequently, the main controller 16 converts these coordinates into base coordinate system data of the robotic arm 84, instructs the robotic arm 84 to dynamically adjust the posture of the gripper 85 for precise grasping, and places it at the preset zero point position of the tooling fixture base plate 13 to complete the loading.

[0064] Next, the core dispensing and curing stage begins, where the main controller 16 executes a three-dimensional real-time closed-loop control based on a mathematical model, encompassing ranging, focusing, and power adjustment. To ensure consistent curing quality, the main controller 16 is pre-set with an ideal curing energy density constant. And calibration functions reflecting the inherent characteristics of the focusing optical module 154. When the gantry moving assembly drives the curing assembly 15 along a preset path, the laser profile sensor 152 continuously measures at an extremely high sampling rate, at any given moment. Obtain the real-time Z-axis height of the workpiece surface The main controller 16 received Then, immediately perform the following synchronous calculations and controls:

[0065] Regarding focusing, the main controller 16 adjusts according to altitude. The corresponding liquid lens control voltage is determined and sent to the focus driver 155. The driver adjusts the focal length of the optical system in milliseconds by changing the voltage applied to the liquid lens, ensuring that the UV light is always precisely focused on the undulating workpiece surface. Regarding power adjustment, the main controller 16, based on optical imaging principles, first calculates the current height... When achieving clear focusing, the actual area that the UV spot will inevitably form on the workpiece surface. :

[0066] ;

[0067] in, This represents the calibration function of the optical system.

[0068] Subsequently, in order to offset the actual area The main controller 16 calculates the effect of changes on energy density in real time using the following formula for the curing lamp 153. The compensation power that must be output at all times :

[0069] ;

[0070] Finally, the main controller 16 converts this physical power demand into an electronic control signal. Such as duty cycle or current value, where The preset power control coefficients are sent to the programmable power supply 156:

[0071] ;

[0072] The programmable power supply 156 quickly adjusts the drive current of the curing lamp 153 based on this signal. Through this formula-based precise compensation, the device ensures that the actual ultraviolet light energy density acting on the adhesive remains at a preset level regardless of the surface irregularities of the workpiece. level.

[0073] Working principle: When using this device, the workpiece is fed into the working area by the conveyor belt 81. The industrial camera 82 installed under the support frame 83 will immediately take pictures of the workpiece. The acquired image signal is transmitted to the main controller 16, which is the brain of the device. Through the visual recognition algorithm, the position and posture of the workpiece on the conveyor belt 81 are accurately analyzed. Based on this data, the main controller 16 then dispatches the robotic arm 84 to drive the gripper 85 at its end to accurately grasp the workpiece and place it stably on the preset processing position of the tooling fixture base plate 13 under the gantry moving assembly.

[0074] Next, the workpiece is precisely fixed. To ensure the absolute stability of the workpiece during the subsequent high-speed movement, the main controller 16 will activate the vacuum adsorption component 14 and start the vacuum generator 144. The generated negative pressure is applied to the vacuum channel 141 inside the tooling fixture base plate 13 through the vacuum tube 145 and the vacuum interface 143. The negative pressure then passes through the adsorption holes 142 distributed on the surface of the base plate, firmly adsorbing the workpiece onto the bearing surface.

[0075] Subsequently, the equipment enters the core precision dispensing and synchronous curing stage. The main controller 16 drives the gantry moving assembly, coordinating the X-axis linear guide rail 2 on the crossbeam 3 and the Y-axis linear guide rail 4 on the equipment base 1 to move the moving seat 7 on the Z-axis slider at high speed along a preset complex three-dimensional path. During the movement, the main controller 16 sends real-time commands to the precision pneumatic controller 11 installed on the equipment base 1. This controller precisely adjusts the pneumatic pressure supplied to the dispensing valve 9 on the moving seat 7, driving the glue in the syringe 10 to be evenly applied to the workpiece surface in a non-contact spray manner. Meanwhile, the pressure gauge 12 installed on the moving seat 7 monitors the air supply pressure throughout the process to ensure a high degree of consistency in the dispensing amount. At the same time, the laser contour sensor 152 installed at the front of the mounting bracket 151 continuously scans the surface contour of the workpiece in front of the dispensing path. The system acquires high-precision Z-axis height data in real time and feeds it back to the main controller 16 in milliseconds. Upon receiving the data, the main controller 16 immediately queries the internally stored, pre-calibrated three-dimensional compensation lookup table for height, focal length, and power to instantly calculate the optimal focal length parameter and required power parameter P corresponding to the current height. Then, the main controller 16 simultaneously issues two independent control commands: on the one hand, it sends the focal length parameter to the focal length driver 155, driving the focusing optical module 154 at the bottom of the mounting bracket 151 to adjust the curing lamp 153's focal length in real time by changing the voltage of the internal liquid lens without mechanical movement, ensuring that the UV spot is always clearly focused on the workpiece surface; on the other hand, it sends the power parameter to the programmable power supply 156 at the top of the mounting bracket 151 to adjust the output power of the curing lamp 153 in real time and linearly. This power compensation aims to offset the change in spot area caused by focal length variations, thereby ensuring that the actual energy density projected onto the workpiece surface remains constant throughout the entire dispensing and curing process, completely solving the problem of uneven curing or damage caused by workpiece undulations.

[0076] Finally, after all dispensing and curing paths are completed, the vacuum adsorption is released, and the tooling fixture substrate 13 is moved forward by the substrate guide rail 17. Then, the operator opens the outer shell of the tooling fixture substrate 13, and the main controller 16 once again commands the robotic arm 84 to grab the completed workpiece and place it into the workpiece recycling bin 86 inside the equipment base. At this point, a complete work cycle ends, the equipment automatically resets, and it is ready to start processing the next workpiece.

Claims

1. A non-contact optical fiber dispensing device, comprising a device base (1), characterized in that, A gantry moving assembly is provided on the top of the equipment base (1), and a feeding assembly (8) is provided on the rear side of the gantry moving assembly. A tooling fixture base plate (13) is provided on the upper side of the equipment base (1), and a vacuum adsorption assembly (14) is provided inside the tooling fixture base plate (13). A moving seat (7) is provided on the upper side of the tooling fixture base plate (13), and an syringe (10) is installed on the moving seat (7). A curing assembly (15) is provided on the left side of the syringe (10), and the curing assembly (15) includes a mounting bracket (151). A laser profile sensor (152) is installed on the front side of the mounting bracket (151), a focus driver (155) is installed inside the mounting bracket (151), a focusing optical module (154) is installed at the bottom of the mounting bracket (151), a curing lamp (153) is installed inside the focusing optical module (154), a programmable power supply (156) is installed on the top of the mounting bracket (151), a dispensing valve (9) is installed on the top of the syringe (10), and a main controller (16) is installed on the right side of the device base (1). The main controller (16) is configured as follows: Based on the Z-axis height data detected in real time by the laser profile sensor (152), the focal length parameter and power parameter are determined; The focal length driver (155) and the programmable power supply (156) are controlled synchronously to adjust the focal length of the focusing optical module (154) and the output power of the curing lamp (153), thereby compensating for changes in the spot area and keeping the actual energy density of the curing lamp (153) on the workpiece surface constant.

2. The non-contact optical fiber dispensing device according to claim 1, characterized in that, The main controller (16) is configured as follows: The laser contour sensor (152) detects the Z-axis height data of the workpiece surface on the dispensing path in real time. Based on the Z-axis height data, the internally stored three-dimensional compensation lookup table for height, focal length, and power is queried to determine the focal length and power parameters corresponding to the current height. Simultaneously, two independent control commands are issued: the focal length parameter is sent to the focal length driver (155) to control the focusing optical module (154) to adjust the focal length of the curing lamp (153) in real time to ensure that the light spot is clearly focused on the workpiece surface; the power parameter is sent to the programmable power supply (156) to adjust the output power of the curing lamp (153) in real time and linearly. Through the above-mentioned synchronous dynamic compensation of focal length and power, the change in spot area caused by the change in Z-axis height is ensured to be offset by the change in power, so that the actual energy density of the curing lamp (153) on the workpiece surface remains constant throughout the dispensing curing process.

3. The non-contact optical fiber dispensing device according to claim 1, characterized in that, The gantry moving assembly includes a Y-axis linear guide rail (4), which is mounted on the equipment base (1). A Y-axis slider is slidably connected to the Y-axis linear guide rail (4). A crossbeam (3) is fixedly connected to the top of the Y-axis slider. An X-axis linear guide rail (2) is fixedly connected to the inner side of the crossbeam (3). A moving seat (7) is slidably connected to the X-axis linear guide rail (2). One end of a drag chain (6) is fixedly connected to the rear side of the moving seat (7). The other end of the drag chain (6) is fixedly connected to the crossbeam (3). A Z-axis linear guide rail (5) is installed on the inner side of the crossbeam (3). A Z-axis slider is slidably connected to the outer side of the Z-axis linear guide rail (5). The moving seat (7) is installed on the front side of the Z-axis slider.

4. The non-contact optical fiber dispensing device according to claim 1, characterized in that, The feeding assembly (8) includes a conveyor belt (81) which is located on the rear side of the gantry moving assembly. A support frame (83) is installed on the conveyor belt (81). An industrial camera (82) is installed at the bottom of the support frame (83). A robotic arm (84) is installed on the right side of the conveyor belt (81). A gripper (85) is fixedly connected to the output end of the robotic arm (84). A workpiece recycling bin (86) is provided inside the equipment base (1). The workpiece recycling bin (86) is located at the tail end of the conveyor belt (81).

5. The non-contact optical fiber dispensing device according to claim 1, characterized in that, The vacuum adsorption assembly (14) includes a vacuum channel (141) disposed inside the tooling fixture base plate (13) and an adsorption hole (142) communicating with the vacuum channel (141). A vacuum interface (143) is fixedly connected to the rear side of the tooling fixture base plate (13). A vacuum tube (145) is fixedly connected to the side of the vacuum interface (143) away from the tooling fixture base plate (13). A vacuum generator (144) is fixedly connected to the vacuum tube (145) away from the vacuum interface (143). The vacuum generator (144) is mounted on the equipment base (1) and is located in front of the pressure gauge (12).

6. The non-contact optical fiber dispensing device according to claim 5, characterized in that, The vacuum interface (143) is fixedly connected to the vacuum channel (141) on the tooling fixture base plate (13).

7. The non-contact optical fiber dispensing device according to claim 1, characterized in that, The top of the equipment base (1) is equipped with a base plate guide rail (17), and the top of the base plate guide rail (17) is fixedly connected to the bottom of the tooling fixture base plate (13).

8. The non-contact optical fiber dispensing device according to claim 4, characterized in that, The main controller (16) is also electrically connected to the feeding assembly (8), and the main controller (16) is further configured to: control the robotic arm (84) to grab the workpiece on the conveyor belt (81) and place it on the tooling fixture base plate (13) based on the image signal collected by the industrial camera (82).

9. The non-contact optical fiber dispensing device according to claim 1, characterized in that, The focusing optical module (154) includes fixed optical path elements, a liquid lens, and a liquid lens driver; The ultraviolet light beam emitted by the curing lamp (153) passes sequentially through the fixed optical path element and the liquid lens; The focal length driver (155) is used to receive the focal length parameter command and directly drive the liquid lens.

10. The non-contact optical fiber dispensing device according to claim 1, characterized in that, A precision air pressure controller (11) is installed on the equipment base (1). The precision air pressure controller (11) is electrically connected to the main controller (16) and connected to the air circuit of the dispensing valve (9). It is used to adjust the spray pressure of the dispensing valve (9) according to the instructions of the main controller (16). A pressure gauge (12) is installed on the movable seat (7) to monitor and display the air circuit pressure supplied to the dispensing valve (9) in real time.

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