Automatic plate feeding equipment for POB light bar production

Abstract

The present application relates to the technical field of LED lighting device production, and specifically discloses an automatic plate feeding device for POB lamp strip production, which comprises a rack, a control system is arranged in the electrical cabinet of the rack, a storage mechanism, a plate separating mechanism, a conveying mechanism and a positioning mechanism are sequentially connected to the rack, an electrostatic elimination mechanism is arranged between the storage mechanism and the conveying mechanism, and a double-sheet detection mechanism is arranged above the inlet end of the conveying mechanism; the storage mechanism is arranged at the feeding end of the rack, is used for stacking and storing the flexible circuit board to be processed, and lifts the uppermost circuit board to a predetermined plate taking height; the plate separating mechanism is arranged above the storage mechanism, comprises a paster component and a pressure roller component, the paster component is used for pushing the uppermost circuit board to the conveying mechanism by friction, and the pressure roller component is used for pressing the edge of the second circuit board during the plate separating process, so that the second circuit board is prevented from being taken out together; and the problems of plate positioning, lamination and electrostatic damage of the POB lamp strip are solved.

Description

Technical Field

[0001] This invention relates to the field of LED lighting equipment manufacturing technology, and in particular to an automatic board loading device for POB light strip production. Background Technology

[0002] POB (Printed On Board) LED strips are widely used in interior decoration and outdoor lighting due to their advantages such as thinness, good heat dissipation, and uniform light emission. With the development of the LED industry, market demand and requirements for product yield are constantly increasing, driving production towards automation and precision.

[0003] The board loading process is a core upstream step in POB light strip production, responsible for accurately conveying each flexible printed circuit board (FPC) to the die bonder. Its efficiency and precision directly determine the production line's capacity and product quality. Currently, some small and medium-sized enterprises still use manual board loading, which is not only labor-intensive and costly, but also prone to positioning deviations of the circuit boards due to operational errors, affecting die bonding accuracy. Static electricity generated by manual contact can damage circuit board components and copper foil, and the slow loading speed cannot match the cycle time of subsequent automated equipment, thus restricting capacity improvement.

[0004] To address the drawbacks of manual board loading, some companies have introduced simplified automated board loading equipment. However, this still suffers from numerous shortcomings, leading to long-term technological biases. Firstly, flexible circuit boards are thin and flexible, and existing material storage mechanisms lack precise guiding and limiting, making stacking prone to misalignment and causing difficulties in board separation and positioning. Secondly, the board separation mechanism is poorly designed, easily resulting in stacking issues, requiring manual shutdown for cleaning, which is slow and has poor adaptability. Thirdly, the lack of an effective static electricity elimination mechanism means that static electricity generated by board separation friction can easily damage precision components, leading to product scrap. Fourthly, the absence of a reliable double-sheet detection mechanism means that stacked board feeding can cause subsequent processing defects, increasing the defect rate.

[0005] In addition, the existing equipment has poor coordination among its various mechanisms, the control system cannot provide precise overall control, the conveying speed cannot be dynamically matched with the die bonder's board picking cycle, and circuit boards are prone to piling up or excessively long intervals; moreover, it has poor versatility, and changing circuit board specifications requires cumbersome manual adjustments, resulting in long production changeover times and making it difficult to meet the needs of multi-variety production.

[0006] Therefore, an automatic board loading device for POB light strip production is proposed to solve the problems of POB light strip board positioning, stacking, and electrostatic damage. Summary of the Invention

[0007] The purpose of this invention is to provide an automatic board loading device for POB light strip production, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: An automatic board loading device for POB light strip production includes a frame, on which a material storage mechanism, a board separating mechanism, a conveying mechanism, a positioning mechanism, an electrostatic elimination mechanism, and a double-sheet detection mechanism are fixedly connected; An electrical cabinet is provided on one side of the frame, and a control system is installed in the electrical cabinet. The control system is electrically connected to the sensors, drivers and actuators of each mechanism. The frame is a frame structure with adjustable feet at the bottom and a worktable at the top. The material storage mechanism is located at the feeding end on the left side of the frame and is used to support and lift the stacked flexible circuit boards; the board separating mechanism is located above the material storage mechanism and is used to separate the circuit boards one by one and push them. The conveying mechanism is located on the workbench and on the outlet side of the storage mechanism, and is used to convey circuit boards. The positioning mechanism is located above the conveying mechanism and is used for multi-directional precise positioning of the circuit board; the static electricity elimination mechanism is located between the storage mechanism and the conveying mechanism and is used to eliminate static electricity from the circuit board. The double-sheet detection mechanism is located above the inlet end of the conveying mechanism and is used to detect the stacking of circuit boards. The equipment integrates the functions of corrugated board separation, flexible conveying, multi-directional precise positioning, online static elimination and double-sheet detection, and realizes time-series coordination and information closed-loop control through the control system.

[0009] Preferably, the frame is a frame structure welded from square steel or assembled from aluminum alloy profiles; adjustable feet are threaded to the four corners of the bottom of the frame, and a worktable is bolted to the top of the frame; the worktable is made of marble or precision-ground steel plate; the control system consists of a PLC controller, a touch screen operation panel, and a servo driver.

[0010] Preferably, the storage mechanism includes a pallet, a lifting screw, a lifting motor, lateral guide columns, a hopper width adjustment mechanism, and a height sensor; the bottom of the pallet is fixed to the lifting screw by a nut, and the lifting screw is connected to the output shaft of the lifting motor by a coupling; the lifting motor is a servo motor or a stepper motor, fixed to the bottom of the frame and electrically connected to the control system; lateral guide columns are symmetrically arranged on both sides of the pallet, and the bottom of the lateral guide columns is connected to the hopper width adjustment mechanism; a height sensor is fixed to one side of the pallet by a bracket, and the height sensor is electrically connected to the control system.

[0011] Preferably, the hopper width adjustment mechanism includes a bidirectional lead screw and a handwheel; the two ends of the bidirectional lead screw have opposite threads and are respectively threaded to the bottom of two lateral guide columns, and the handwheel is fixed at the end of the bidirectional lead screw.

[0012] Preferably, the separating mechanism includes a washboard assembly and a pressure roller assembly; the washboard assembly includes a washboard, friction strips, a flexible buffer, a washboard drive cylinder, and a linear guide rail; the friction strips are embedded on the lower surface of the washboard, and one side of the washboard is connected to the piston rod of the washboard drive cylinder through the flexible buffer; both sides of the washboard are slidably engaged with the linear guide rail through sliders, and the linear guide rail is fixed to the frame; the cylinder body of the washboard drive cylinder is fixed to the crossbeam on the frame through a flange.

[0013] Preferably, the pressure roller assembly includes a pressure roller, a pressure roller bracket, and a pressure roller drive cylinder; the pressure roller is rotatably mounted on the lower end of the pressure roller bracket via a bearing, and the upper end of the pressure roller bracket is connected to the piston rod of the pressure roller drive cylinder; the cylinder body of the pressure roller drive cylinder is fixed to the crossbeam on the frame via a flange.

[0014] Preferably, the conveying mechanism includes a driving roller, a driven roller, a main conveyor belt, a driven conveyor belt, a conveyor belt drive motor, an inlet photoelectric sensor, and an outlet photoelectric sensor; the driving roller and the driven roller are rotatably mounted on the worktable via bearing seats; the main conveyor belt and the driven conveyor belt are wound around the outside of the roller body; the driving roller is connected to the conveyor belt drive motor via a synchronous belt; the inlet and outlet photoelectric sensors are respectively fixed to both ends of the conveying mechanism via brackets, and both are electrically connected to the control system.

[0015] Preferably, the positioning mechanism includes a front windshield assembly, a side push assembly, and an upper pressure assembly; the front windshield assembly includes a front stop block, a front windshield cylinder, and a photoelectric sensor, with the piston rod of the front windshield cylinder connected to the bottom of the front stop block; the side push assembly includes a left push plate, a right push plate, a left side push cylinder, a right side push cylinder, and a reference guide rail; the upper pressure assembly includes an upper pressure roller, an upper pressure roller bracket, and an upper pressure cylinder, with the upper pressure roller mounted on the lower end of the upper pressure roller bracket via a bearing.

[0016] Preferably, the static elimination mechanism includes an ion bar and an electrostatic sensor; the ion bar is fixed to the frame by a bracket, and the electrostatic sensor is located downstream of the ion bar; both the ion bar and the electrostatic sensor are electrically connected to the control system.

[0017] Preferably, the double-sheet detection mechanism includes a thickness detection sensor and a controller; the thickness detection sensor is fixed to the frame by a bracket, and the controller is electrically connected to both the thickness detection sensor and the control system.

[0018] The beneficial effects of this invention are: This dual-action depaneling structure utilizes a flexible, buffering friction pusher assembly and a pressure roller assembly to simultaneously press down and lock the secondary layer of board material. The pusher assembly, aided by silicone and polyurethane friction strips, increases friction with the circuit board to push each sheet individually, while the pressure rollers, made of rubber-coated rollers, press firmly against the edges of the lower layer of board material. The flexible buffer effectively cushions the pushing impact. This achieves stable, single-sheet peeling of thin, flexible circuit boards without damage, fundamentally solving the technical problems of easy deformation and tearing in traditional vacuum adsorption depaneling and easy stacking and material smearing in ordinary friction depaneling. This significantly reduces the depaneling failure rate and ensures continuous material feeding.

[0019] A three-dimensional composite positioning mechanism, employing a front stop, a side push reference positioning, and a flexible upper pressure roller, limits the front end of the board material. The side push assembly uses a reference guide rail for precise lateral alignment, and the upper pressure roller uses a rubber-coated roller for flexible clamping, avoiding hard contact that could damage the flexible substrate. This mechanism achieves coordinated positioning of the easily deformable flexible circuit board through rigid constraint and flexible clamping, effectively suppressing board warping and offset, controlling positioning accuracy within the requirements of the die bonder process, reducing defects such as chip mounting misalignment and poor soldering, and significantly improving the yield rate of the die bonder process.

[0020] By placing an electrostatic elimination mechanism at the front of the board separation outlet and using a closed-loop feedback system with an electrostatic sensor to regulate the ion air output, the ion air bar instantly releases ions to neutralize the charge at the source of static electricity generated immediately after the board separation friction. A non-contact electrostatic sensor monitors the surface electrostatic potential in real time, and the control system dynamically adjusts the output power of the ion air bar. This achieves immediate elimination of static electricity at the source during the board separation process, unlike the lag in traditional back-end electrostatic elimination methods. It effectively prevents electrostatic discharge from damaging circuit board traces and LED chips, reduces the scrap rate caused by electrostatic discharge, and improves product reliability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the rack mounting structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram showing the location of the pressure-up component in an embodiment of the present invention; Figure 4 This is a schematic diagram of the position of the upper pressure roller in an embodiment of the present invention; Figure 5 This is a side view of the overall structure of an embodiment of the present invention; Figure 6 This is a schematic diagram of the positioning mechanism structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the material storage mechanism according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the plate-splitting mechanism according to an embodiment of the present invention; Figure 9This is a schematic diagram showing the position of the friction strip in an embodiment of the present invention.

[0022] In the diagram: 100, frame; 110, foot; 120, worktable; 130, electrical cabinet; 200, storage mechanism; 210, pallet; 220, lifting screw; 230, lifting motor; 240, lateral guide column; 250, hopper width adjustment mechanism; 251, bidirectional screw; 252, handwheel; 260, height sensor; 300, plate separating mechanism; 310, corrugated board assembly; 311, corrugated board; 312, corrugated board drive cylinder; 313, flexible buffer; 314, linear guide rail; 315, friction strip; 320, pressure roller assembly; 321, pressure roller; 322, pressure roller drive cylinder; 323, pressure roller bracket; 400, conveying mechanism; 410, main conveyor belt; 420, driven conveyor belt; 430, conveyor belt drive. 440. Motor; 450. Driven roller; 460. Inlet-end photoelectric sensor; 470. Outlet-end photoelectric sensor; 500. Positioning mechanism; 510. Front stop assembly; 511. Front stop block; 512. Front stop cylinder; 513. Photoelectric sensor; 520. Side push assembly; 521. Left push plate; 522. Right push plate; 523. Left side push cylinder; 524. Right side push cylinder; 525. Reference guide rail; 530. Upper pressure assembly; 531. Upper pressure roller; 532. Upper pressure roller bracket; 533. Upper pressure cylinder; 600. Static elimination mechanism; 610. Ionizing air bar; 620. Static electricity sensor; 700. Double sheet detection mechanism; 710. Thickness detection sensor; 720. Controller; 800. Control system. Detailed Implementation

[0023] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments in a non-limiting manner. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the concept of the present invention without inventive effort are within the protection scope of the present invention. Example 1

[0024] See Figure 1-9To address the long-standing technical limitations of existing POB light strip production board loading equipment, such as difficulties in positioning flexible circuit boards, slow board feeding speed, easy stacking, and electrostatic damage, this invention provides an automatic board loading device for POB light strip production. The device includes a frame 100, on which a material storage mechanism 200, a board separating mechanism 300, a conveying mechanism 400, a positioning mechanism 500, an electrostatic elimination mechanism 600, and a double-sheet detection mechanism 700 are bolted together. An electrical cabinet 130 is bolted to one side of the frame 100. Inside the electrical cabinet 130, a control system 800 is mounted via guide rails. The control system 800 is electrically connected to all sensors, drivers, and actuators via shielded cables, and is used to coordinate and control the operating parameters and timing of each mechanism.

[0025] The frame 100 is a frame structure assembled from square steel welded or aluminum alloy profiles, providing an installation and support foundation for all mechanisms. Adjustable height feet 110 are threadedly connected to the four corners of the bottom of the frame 100. These feet 110 are used to adjust the levelness of the frame 100, ensuring the operational stability of each mechanism. A worktable 120 is bolted to the top of the frame 100 to ensure the flatness accuracy of the installation reference. The control system 800 consists of a PLC controller, a touch screen operation panel, and a servo driver, responsible for coordinating the actions of each mechanism and realizing automated equipment operation.

[0026] The storage mechanism 200 is located at the left feeding end of the frame 100 and is used to support and lift stacked flexible circuit boards. It includes a support plate 210, the bottom of which is fixedly connected to a lifting screw 220 by a nut. The support plate 210 is used to support the stacked flexible circuit boards. The lower end of the lifting screw 220 is fixedly connected to the output shaft of a lifting motor 230 by a coupling. The lifting motor 230 is selected as a servo motor or a stepper motor and is fixed to the bottom crossbeam of the frame 100 by bolts. It is electrically connected to the control system 800 and is used to drive the support plate 210 to move up and down in the vertical direction. Lateral guide posts 240 are symmetrically arranged on both sides of the pallet 210. The lateral guide posts 240 extend vertically to limit the horizontal displacement of the circuit board and prevent the circuit board from tilting or slipping during lifting. The bottom of the two lateral guide posts 240 is connected to a hopper width adjustment mechanism 250. The hopper width adjustment mechanism 250 includes a bidirectional lead screw 251. The two ends of the bidirectional lead screw 251 have opposite threads and are threaded to the bottom nut seats of the two lateral guide posts 240 respectively. A handwheel 252 is fixedly connected to the end of the bidirectional lead screw 251. By rotating the handwheel 252, the two lateral guide posts 240 can be driven to move closer or further away synchronously to adapt to flexible circuit boards of different widths. A height sensor 260 is fixedly connected to one side of the pallet 210 via a bracket. The height sensor 260 is electrically connected to the control system 800 and is used to detect the position of the uppermost circuit board on the pallet 210 in real time. The control system 800 automatically controls the lifting motor 230 to operate based on its feedback signal, so that the uppermost circuit board is always kept at the predetermined board lifting height.

[0027] The board separation mechanism 300 is located above the storage mechanism 200 and is used to separate the stacked flexible circuit boards one by one and push them to the conveying mechanism; it includes a rubbing board assembly 310 and a pressure roller assembly 320, which work together to achieve anti-overlapping board separation.

[0028] The washboard assembly 310 includes a washboard 311, which is a rectangular plate structure with friction strips 315 embedded on its lower surface. The friction strips 315 are made of silicone or polyurethane. One side of the washboard 311 is fixedly connected to the piston rod of the washboard drive cylinder 312 via a flexible buffer 313. The flexible buffer 313 is a compression spring or a rubber buffer pad, used to adjust the contact pressure between the washboard 311 and the circuit board and absorb the pushing impact. The cylinder body of the washboard drive cylinder 312 is fixed to the upper crossbeam of the frame 100 by flange bolts, and is used to drive the washboard 311 to reciprocate in the horizontal direction; the washboard 311 has sliders fixed to both sides by bolts, and the sliders are slidably engaged with the horizontally installed linear guide rail 314. The linear guide rail 314 is fixed to the frame 100 by bolts to ensure the straightness of the movement of the washboard 311 and avoid pushing off course.

[0029] The pressure roller assembly 320 includes a pressure roller 321, which is a rubber-coated roller and is rotatably mounted on the lower end of the pressure roller bracket 323 via a deep groove ball bearing, for pressing the edge of the second circuit board; the upper end of the pressure roller bracket 323 is fixedly connected to the piston rod of the pressure roller drive cylinder 322, and the cylinder body of the pressure roller drive cylinder 322 is vertically fixed to the upper crossbeam of the frame 100 via flange bolts, for driving the pressure roller 321 to move up and down in the vertical direction.

[0030] When the storage mechanism 200 raises the topmost stacked circuit board to the predetermined board-retrieving height, the control system 800 issues a command. The scouring pad drive cylinder 312 pushes the scouring pad 311 along the linear guide rail 314 toward the conveying mechanism 400. The friction strip 315 contacts the upper surface of the topmost circuit board, pushing it forward by friction. At the same time, the pressure roller drive cylinder 322 pushes the pressure roller 321 downward, pressing the edge of the second circuit board to prevent it from being carried out due to electrostatic adsorption or edge hooking. After the scouring pad 311 has traveled a preset distance, the topmost circuit board completely leaves the stacking area and lands at the entrance of the conveying mechanism 400. Subsequently, the scouring pad drive cylinder 312 and the pressure roller drive cylinder 322 reset simultaneously, and the pallet 210 rises to the height of one circuit board thickness under the drive of the lifting motor 230, preparing for the next board separation operation.

[0031] The conveying mechanism 400 is fixed to the workbench 120 by bolts and is located on the outlet side of the storage mechanism 200. It is used to smoothly convey the flexible circuit board after separation to the positioning mechanism. It includes a drive roller 440 and a driven roller 450, which are rotatably connected to both ends of the workbench 120 by bearings. A main conveyor belt 410 and a driven conveyor belt 420 are wound around the outside of the drive roller 440 and the driven roller 450. The main conveyor belt 410 and the driven conveyor belt 420 are arranged in parallel with a gap. Their surfaces are provided with anti-slip textures or have anti-slip pads attached to increase the friction between them and the circuit board and prevent slippage during conveying. The shaft end of the drive roller 440 is connected to the output shaft of the conveyor belt drive motor 430 via a synchronous pulley and a synchronous belt. The conveyor belt drive motor 430 is a stepper motor or a servo motor, which is fixed to the bottom of the worktable 120 by bolts to provide power for the operation of the conveyor belt. Through-beam photoelectric sensors 460 are fixed on both sides of the inlet end of the conveying mechanism 400 by L-shaped brackets to detect the entry signal of the circuit board. Through-beam photoelectric sensors 470 are fixed on both sides of the outlet end by the same structure to detect the output signal of the circuit board. The through-beam photoelectric sensors 460 and 470 are electrically connected to the control system 800 to realize precise control of the conveying process.

[0032] When the inlet photoelectric sensor 460 detects the circuit board entering, the control system 800 starts the conveyor belt drive motor 430 to convey the circuit board forward; when the outlet photoelectric sensor 470 detects the circuit board being sent out, the control system 800 decides whether to pause the conveying according to the working requirements of the subsequent equipment to ensure coordinated operation between the equipment.

[0033] The positioning mechanism 500 is located above the conveying mechanism 400, near the entrance of the die bonder, and is used to perform multi-directional precise positioning of the conveyed flexible circuit board to ensure the accuracy of subsequent die bonder board picking and mounting; it includes a front baffle assembly 510, a side push assembly 520 and an upper pressure assembly 530, which work together to achieve omnidirectional positioning of the circuit board.

[0034] The front stop assembly 510 includes a front stop block 511, which is an L-shaped metal block with a rubber buffer pad at the front end to block the front end of the circuit board and prevent collision damage. The bottom of the front stop block 511 is fixedly connected to the piston rod of the front stop cylinder 512. The front stop cylinder 512 is vertically mounted on the frame below the worktable 120 and is used to drive the front stop block 511 to move up and down in the vertical direction. A photoelectric sensor 513 is fixed to the side of the front stop block 511 by a bracket. The photoelectric sensor 513 is electrically connected to the control system 800 and is used to detect whether the circuit board has contacted the front stop block 511, providing a trigger signal for the positioning action.

[0035] The side-pushing assembly 520 includes a left push plate 521 and a right push plate 522, which are arranged opposite to each other on both sides of the conveying mechanism 400. Wear-resistant pads are attached to their inner surfaces to protect the circuit board surface and enhance positioning stability. The outer side of the left push plate 521 is fixedly connected to the piston rod of the left push cylinder 523, and the outer side of the right push plate 522 is fixedly connected to the piston rod of the right push cylinder 524. The left push cylinder 523 and the right push cylinder 524 are both fixed to the worktable 120 by bolts to drive the push plate to move horizontally. A reference guide rail 525 is fixed to one side of the worktable 120 by bolts as a reference surface for lateral positioning. The circuit board is pushed towards the reference guide rail 525 by the action of the push plate to achieve lateral positioning.

[0036] The upper pressing assembly 530 includes an upper pressing roller 531, which is a rubber-coated roller and is rotatably mounted on the lower end of the upper pressing roller bracket 532 via bearings. It is used to press the upper surface of the circuit board to prevent it from tilting or shifting when the board is removed. The upper end of the upper pressing roller bracket 532 is fixedly connected to the piston rod of the upper pressing cylinder 533. The upper pressing cylinder 533 is vertically mounted on the upper crossbeam of the frame 100 and is used to drive the upper pressing roller 531 to move up and down in the vertical direction.

[0037] The conveying mechanism 400 transports the circuit board to the position of the front stop 511. The photoelectric sensor 513 is triggered → the conveying mechanism 400 pauses → the front stop cylinder 512 drives the front stop 511 to rise, blocking the front end of the circuit board → the left push cylinder 523 and the right push cylinder 524 act simultaneously to push the circuit board towards the reference guide rail 525, completing the lateral positioning → the upper pressure cylinder 533 drives the upper pressure roller 531 to descend, pressing the upper surface of the circuit board → the control system 800 sends a "ready" signal to the die bonder; after the die bonder finishes picking up the board, the upper pressure roller 531 is raised, the front stop 511 is lowered, the conveying mechanism 400 starts, and the next circuit board is sent out.

[0038] The static elimination mechanism 600 is located between the outlet side of the storage mechanism 200 and the inlet side of the conveying mechanism 400 to eliminate static electricity on the surface of the circuit board, avoiding static damage and potential stacking hazards. It includes an ion air bar 610, which is fixed to the frame 100 by a bracket. Its length direction is perpendicular to the circuit board conveying direction, and it generates ion air to neutralize the static charge on the circuit board surface. A static sensor 620 is fixed downstream of the ion air bar 610 by a bracket. The static sensor 620 is a non-contact electrostatic potentiometer with its probe facing the circuit board surface, used to monitor the static potential on the circuit board surface in real time. Both the ion air bar 610 and the static sensor 620 are electrically connected to the control system 800, forming a closed-loop control for static elimination.

[0039] The rubbing plate 311 of the board separation mechanism 300 generates static electricity during the frictional pushing of the circuit board. The ion wind bar 610 generates ion wind the moment the circuit board leaves the stacking area to neutralize the static charge on the surface of the circuit board. The static electricity sensor 620 monitors the elimination effect in real time. When the static electricity potential exceeds the set threshold, the control system 800 automatically increases the high voltage output voltage of the ion wind bar 610 or increases the air volume to ensure that the static electricity elimination effect meets the standard.

[0040] The double-sheet detection mechanism 700 is located above the inlet end of the conveying mechanism 400 and is used to detect whether there is stacking of circuit boards during feeding, promptly detect faults and provide feedback; it includes a thickness detection sensor 710, which is a laser displacement sensor or an ultrasonic sensor, fixed to the frame 100 by a bracket, with the detection probe facing the surface of the circuit board on the conveyor belt, for real-time measurement of the thickness of the circuit board; the thickness detection sensor 710 is electrically connected to a controller 720, which is electrically connected to the control system 800, for processing detection data and determining whether stacking exists.

[0041] When the circuit board passes under the thickness detection sensor 710, the sensor measures the thickness value of the circuit board. The controller 720 compares the measured thickness value with a preset single-sheet thickness threshold. If the measured thickness exceeds a preset multiple of the single-sheet thickness threshold, it is determined that two or more sheets are overlapping. The control system 800 immediately issues an alarm signal and stops the operation of the conveying mechanism 400 and the separating mechanism 300, waiting for manual intervention. At the same time, the control system 800 records the fault and automatically adjusts the driving force of the washboard drive cylinder 312 and the pressure of the pressure roller drive cylinder 322. By changing the friction and clamping force, the separating effect is improved, and the recurrence of the stacking fault is reduced.

[0042] Working principle: Standby state: The operator sets the equipment working parameters through the touch screen. The lifting motor 230 drives the pallet 210 to rise to the highest position. The operator places a stack of flexible circuit boards to be processed on the pallet 210 and adjusts the spacing of the guide columns 240 on both sides through the handwheel 252 to match the width of the circuit boards. The control system 800 automatically adjusts the height of the pallet 210 according to the feedback signal of the height sensor 260, so that the topmost circuit board is in the predetermined board picking position, and the equipment enters the standby ready state.

[0043] Automatic Operation Cycle: Step 1: The control system 800 issues a "pick board" command. The rubbing plate drive cylinder 312 drives the rubbing plate 311 to push the topmost circuit board forward, while the pressure roller drive cylinder 322 pushes the pressure roller 321 down to press the edge of the second circuit board. Step 2: The circuit board is pushed to the inlet end of the conveyor mechanism 400. The photoelectric sensor 460 at the inlet end is triggered, and the control system 800 starts the conveyor belt drive motor 430. Step 3: The circuit board passes under the ion air bar 610 to complete static elimination. At the same time, the thickness detection sensor 710 measures the thickness of the circuit board to determine whether it is a single sheet feed. If stacked sheets are detected, the system immediately alarms and stops. Step 4: The circuit board is conveyed to the positioning mechanism 500. The photoelectric sensor 513 is triggered, the front stop 511 rises, and the conveyor mechanism 400 pauses. The side push assembly 520 completes lateral positioning, and the upper pressure roller 531 descends to press the circuit board. Step 5: The control system 800 sends a "board in place" signal to the die bonder. After the die bonder picks up the board, the photoelectric sensor 470 at the outlet detects that the circuit board has left, the front stop 511 descends, the conveying mechanism 400 restarts, and the next cycle begins.

[0044] Changeover process: When it is necessary to change to a circuit board of different specifications, the operator inputs the new product parameters on the touch screen. The control system 800 prompts the operator to manually adjust the width of the guide column 240, the front and rear positions of the front stop 511, the reference position of the side push assembly 520, and the clamping force of the upper pressure roller 531 to complete the changeover. Example 2

[0045] Based on the above embodiment 1, the conveyor belt drive motor 430 of the conveying mechanism 400 is selected as a servo motor. The servo motor is electrically connected to the control system 800 through a servo driver, and its speed is dynamically adjusted by the control system 800 according to the board picking cycle of the subsequent die bonder.

[0046] When the die bonder picks up the board faster, the control system 800 automatically increases the speed of the servo motor and shortens the circuit board conveying interval through the trigger frequency feedback of the output end photoelectric sensor 470, so as to ensure that the board supply speed matches the board picking speed. When the die bonder pauses board picking, the conveying mechanism 400 automatically slows down or stops to prevent circuit boards from piling up at the positioning mechanism and to prevent damage to the circuit boards or positioning deviations. Example 3

[0047] Based on the above embodiments one or two, the flexible buffer 313 of the washboard assembly 310 adopts a replaceable compression spring group. By replacing springs with different stiffnesses, the contact pressure between the washboard 311 and the circuit board can be flexibly adjusted. A proportional pressure regulating valve is connected to the air supply line of the washboard drive cylinder 312. The proportional pressure regulating valve is electrically connected to the control system 800 and is used to precisely adjust the output pressure of the cylinder. The control system 800 automatically adjusts the output air pressure of the proportional pressure regulating valve according to the circuit board thickness measured by the thickness detection sensor 710: the thicker the circuit board, the higher the air supply pressure, to ensure sufficient pushing friction and ensure smooth pushing of the circuit board; the thinner the circuit board, the lower the air supply pressure, to avoid excessive pressure damaging the copper foil on the surface of the circuit board. This automatic adjustment function allows the equipment to seamlessly process circuit boards of different thicknesses without repeated manual adjustments, improving production efficiency and equipment adaptability. Example 4

[0048] This embodiment provides a POB LED strip production line using the aforementioned automatic board loading equipment. The automatic board loading equipment has a die bonder connected to its outlet via a conveyor belt. The die bonder's outlet is connected to a reflow oven via a conveyor belt, and the reflow oven's outlet is connected to a dispensing machine via a conveyor belt. The automatic board loading equipment precisely loads and positions the flexible circuit boards one by one. The die bonder's nozzle directly picks up the circuit boards from above the positioning mechanism for chip mounting. After mounting, the circuit boards are soldered in the reflow oven to ensure a reliable connection between the chips and the circuit boards. Finally, the boards are encapsulated by the dispensing machine, completing the core production process of the POB LED strip.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic board loading device for POB light strip production, comprising a frame (100), wherein a storage mechanism (200), a board separating mechanism (300), a conveying mechanism (400), a positioning mechanism (500), an electrostatic elimination mechanism (600), and a double-sheet detection mechanism (700) are fixedly connected to the frame (100). An electrical cabinet (130) is provided on one side of the frame (100), and a control system (800) is installed in the electrical cabinet (130). The control system (800) is electrically connected to the sensors, drivers and actuators of each mechanism respectively. The frame (100) is a frame structure with adjustable feet (110) at the bottom and a worktable (120) at the top. The storage mechanism (200) is located at the left feeding end of the frame (100) and is used to carry and lift the stacked flexible circuit boards; the board separating mechanism (300) is located above the storage mechanism (200) and is used to separate the circuit boards one by one and push them. The conveying mechanism (400) is located on the workbench (120) and on the outlet side of the storage mechanism (200), and is used to convey circuit boards; The positioning mechanism (500) is located above the conveying mechanism (400) and is used for multi-directional precise positioning of the circuit board; the static electricity elimination mechanism (600) is located between the storage mechanism (200) and the conveying mechanism (400) and is used to eliminate static electricity from the circuit board. The double-sheet detection mechanism (700) is located above the entrance end of the conveying mechanism (400) and is used to detect the stacking of circuit boards. The equipment integrates the functions of corrugated board separation, flexible conveying, multi-directional precise positioning, online static elimination and double-sheet detection, and realizes time-series coordination and information closed-loop control through the control system (800).

2. The automatic loading equipment for POB light strip production according to claim 1, characterized in that: The frame (100) is a frame structure made of welded square steel or assembled aluminum alloy profiles; the four corners of the bottom of the frame (100) are connected by threaded feet (110), and the top of the frame (100) is fixed with a worktable (120) by bolts; the worktable (120) is made of marble or precision ground steel plate; the control system (800) consists of a PLC controller, a touch screen operation panel and a servo driver.

3. The automatic loading equipment for POB light strip production according to claim 1, characterized in that: The storage mechanism (200) includes a pallet (210), a lifting screw (220), a lifting motor (230), a lateral guide column (240), a hopper width adjustment mechanism (250), and a height sensor (260). The bottom of the pallet (210) is fixed to the lifting screw (220) by a nut, and the lifting screw (220) is connected to the output shaft of the lifting motor (230) by a coupling. The lifting motor (230) is a servo motor or a stepper motor, fixed to the bottom of the frame (100), and electrically connected to the control system (800). Lateral guide columns (240) are symmetrically arranged on both sides of the pallet (210), and the bottom of the lateral guide column (240) is connected to the hopper width adjustment mechanism (250). The height sensor (260) is fixed to one side of the pallet (210) by a bracket, and the height sensor (260) is electrically connected to the control system (800).

4. The automatic loading equipment for POB light strip production according to claim 3, characterized in that: The hopper width adjustment mechanism (250) includes a two-way lead screw (251) and a handwheel (252); the two ends of the two-way lead screw (251) have opposite threads and are respectively threaded to the bottom of two lateral guide columns (240), and the handwheel (252) is fixed at the end of the two-way lead screw (251).

5. The automatic loading equipment for POB light strip production according to claim 1, characterized in that: The plate separating mechanism (300) includes a washboard assembly (310) and a pressure roller assembly (320); the washboard assembly (310) includes a washboard (311), a friction strip (315), a flexible buffer (313), a washboard drive cylinder (312), and a linear guide (314); the friction strip (315) is embedded on the lower surface of the washboard (311), and one side of the washboard (311) is connected to the piston rod of the washboard drive cylinder (312) through the flexible buffer (313); the two sides of the washboard (311) are slidably engaged with the linear guide (314) through sliders, and the linear guide (314) is fixed to the frame (100); the cylinder body of the washboard drive cylinder (312) is fixed to the upper beam of the frame (100) through a flange.

6. The automatic loading equipment for POB light strip production according to claim 1, characterized in that: The pressure roller assembly (320) includes a pressure roller (321), a pressure roller bracket (323), and a pressure roller drive cylinder (322); the pressure roller (321) is rotatably mounted on the lower end of the pressure roller bracket (323) via a bearing, and the upper end of the pressure roller bracket (323) is connected to the piston rod of the pressure roller drive cylinder (322); the cylinder body of the pressure roller drive cylinder (322) is fixed to the upper beam of the frame (100) via a flange.

7. The automatic loading equipment for POB light strip production according to claim 1, characterized in that: The conveying mechanism (400) includes a drive roller (440), a driven roller (450), a main conveyor belt (410), a driven conveyor belt (420), a conveyor belt drive motor (430), an inlet photoelectric sensor (460), and an outlet photoelectric sensor (470). The drive roller (440) and the driven roller (450) are rotatably mounted on the worktable (120) via bearing seats. The main conveyor belt (410) and the driven conveyor belt (420) are wound around the outside of the roller body. The drive roller (440) is connected to the conveyor belt drive motor (430) via a synchronous belt. The inlet and outlet photoelectric sensors are fixed at both ends of the conveying mechanism (40) via brackets and are electrically connected to the control system (800).

8. The automatic loading equipment for POB light strip production according to claim 1, characterized in that: The positioning mechanism (500) includes a front windshield assembly (510), a side push assembly (520), and an upper pressure assembly (530); the front windshield assembly (510) includes a front stop block (511), a front windshield cylinder (512), and a photoelectric sensor (513), with the piston rod of the front windshield cylinder (512) connected to the bottom of the front stop block (511); the side push assembly (520) includes a left push plate (521), a right push plate (522), a left push cylinder (523), a right push cylinder (524), and a reference guide rail (525); the upper pressure assembly (530) includes an upper pressure roller (531), an upper pressure roller bracket (532), and an upper pressure cylinder (533), with the upper pressure roller (531) mounted on the lower end of the upper pressure roller bracket (532) via a bearing.

9. An automatic loading device for POB light strip production according to claim 1, characterized in that: The static elimination mechanism (600) includes an ion bar (610) and an electrostatic sensor (620); the ion bar (610) is fixed to the frame (100) by a bracket, and the electrostatic sensor (620) is located downstream of the ion bar (610); both the ion bar (610) and the electrostatic sensor (620) are electrically connected to the control system (800).

10. An automatic loading device for POB light strip production according to claim 1, characterized in that: The double sheet detection mechanism (700) includes a thickness detection sensor (710) and a controller (720); the thickness detection sensor (710) is fixed to the frame (100) by a bracket, and the controller (720) is electrically connected to the thickness detection sensor (710) and the control system (800) respectively.

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