A kind of quality inspection machine detects the paper capture recovery system and method of warehouse fly

Abstract

The application discloses a kind of product inspection machine detection bin flying paper capture recovery system and method.The system includes: guide recovery bin, with semi-enclosed long tubular structure with arc inner wall, fixedly installed on the side shell of exposure light source towards the direction of flying paper, capture flying paper and guide to collection area at flying paper source head;Flying paper sensing unit is set in the channel inside guide recovery bin, detects whether there is flying paper and outputs detection signal;Air blowing rejection device is coupled with compressed air source, and air is blown to the direction of collection area under control;Product collection platform receives blown flying paper;Controller is electrically coupled with flying paper sensing unit, air blowing rejection device, responds to detection signal, executes preset delay logic and then starts air blowing rejection operation.The application can actively capture accidental flying paper, physically isolate flying paper from contact with precision detection components, protect core devices, realize automatic recovery of flying paper and continuous production.

Description

Technical Field

[0001] This invention relates to the field of quality inspection technology for printed packaging products, and in particular to a system and method for capturing and recovering fly paper in the inspection chamber of a quality inspection machine. Background Technology

[0002] In the printing and packaging industry, sheet-fed quality control machines are widely used for high-speed quality inspection of printed paper. The inspection chamber of these machines typically houses a high-speed line-scan camera, a high-brightness exposure light source, and a negative-pressure adsorption conveyor surface. Paper is adsorbed and transported at high speed on the conveyor surface by negative pressure, allowing the camera to capture a clear image at a constant focal length. However, for products with varying basis weights, sizes, and surface characteristics, the suction force is often insufficient, and the tail of the paper easily drifts off the adsorption surface during high-speed movement, resulting in "flying paper." This flying paper moves erratically towards the exposure light source. If it accumulates on the light source surface or gets caught in the camera lens area, it can obstruct heat dissipation and burn out the light source, or press and scratch the precision camera lens, causing significant economic losses. Simultaneously, paper jams caused by flying paper instantly generate a large number of wrinkled and torn defective products, requiring operators to frequently stop the machine to enter the high-temperature, high-brightness inspection chamber for cleaning, severely impacting production efficiency.

[0003] Patent document CN112122158B discloses an automatic waste removal method and device. It uses a visual inspection device to check the paper printing quality. When a defective product is found, the control center determines whether the defective product has reached the collection gap between the two conveying devices based on the number of sheets and preset counting data. If it has reached the gap, the control air blowing device blows it into the collection tank. While this solution can remove known defective printed materials without shutting down the machine, it has the following drawbacks: First, the solution relies on a visual inspection device to detect printing quality, and can only handle already determined defective products, failing to address accidental flying paper incidents caused by poor adhesion. Second, its control logic is based on counting and accumulating the number of sheets of paper to determine whether waste has reached the designated position. Essentially, it is a tracking method for known targets in a normal transport sequence, dealing with deterministic events. It cannot effectively capture and remove accidental flying paper with random locations and irregular trajectories. Third, the solution does not involve any protective measures for precision components (such as cameras and light sources) within the inspection chamber, nor does it possess the structure and capability to actively capture flying paper in a closed or semi-closed inspection chamber environment.

[0004] In summary, existing technologies have limitations in addressing damage to precision components caused by accidental fly paper in the inspection chamber of quality inspection machines and in achieving automated fly paper recycling. These limitations include functional deficiencies and insufficient applicability. Summary of the Invention

[0005] This invention solves the problem of accidental fly paper generated in the testing chamber of existing quality inspection machines due to poor adsorption, which leads to damage to precision testing components, product scrapping, and frequent machine downtime. It provides a fly paper capture and recovery system and method for the testing chamber of quality inspection machines, which achieves the technical effects of actively capturing fly paper, protecting precision components, automatically recovering fly paper, and maintaining continuous production.

[0006] To achieve the above objectives, the following technical solution is proposed: A paper capture and recovery system for a quality inspection machine's inspection chamber, wherein the inspection chamber is equipped with a negative pressure adsorption conveying surface, a high-speed inspection camera, and an exposure light source; the system includes: The guide and recovery bin is a semi-enclosed long tubular structure with an arc-shaped inner wall. It is fixedly installed on the side of the housing facing the direction of the flying paper of the exposure light source. It is configured to capture the flying paper at the source of the flying paper and guide the captured flying paper to the collection area through the channel formed by its arc-shaped inner wall. The fly paper sensing unit is located inside the channel of the guide and recycling bin and is configured to detect whether any accidentally flying paper enters the channel and output a detection signal. An air-blowing rejection device is coupled to a compressed air source, and its air outlet is located on the wall of the guide recovery chamber. It is configured to blow air in a controlled manner toward the collection area to blow out the fly paper that has entered the channel. The product collection platform is set in the collection area, facing the air blowing direction of the air blowing rejection device, and is configured to receive the blown-out fly paper. The controller is electrically coupled to the paper-flying sensing unit and the air-blowing rejection device, and is configured to respond to the detection signal output by the paper-flying sensing unit, execute a preset delay logic, and then start the air-blowing rejection device to perform the air-blowing rejection operation.

[0007] Through the above technical solution, by installing a semi-enclosed long tubular guide and recovery bin with an arc-shaped inner wall on the housing of the exposure light source inside the inspection chamber of the quality inspection machine, and in conjunction with the fly paper sensing unit set inside the channel, the system can actively capture the flying paper directly at the source of fly paper generation—the exposure light source—and confine it within a safe guide channel. This physically and completely isolates the fly paper from contact with the precision inspection camera and the exposure light source, fundamentally eliminating the hidden danger of paper jams causing damage to core components. Simultaneously, the controller adopts a control method that responds to the detection signal from the fly paper sensing unit and executes preset delay logic before initiating the air-blowing rejection, rather than the counting and tracking of known targets used in existing technologies. This allows for accurate and rapid response to randomly occurring fly paper events, avoiding false blowing or missed blowing, improving the accuracy of fly paper rejection and the reliability of the system under high-speed production. The air-blowing rejection device blows air along the arc-shaped inner wall, stably conveying the fly paper to the product collection platform, creating conditions for subsequent recycling.

[0008] Preferably, the flying paper sensing unit includes a dedicated sensing light source and a photodetector matched with the dedicated sensing light source. The two are respectively disposed on opposite side walls of the arc-shaped guide channel, forming a through-beam optical path that traverses the interior of the channel. The dedicated sensing light source is configured to emit infrared light of a specific wavelength, and the front end of the photodetector is equipped with a narrowband filter that matches the specific wavelength to counteract interference from the exposure light source in the detection chamber.

[0009] Through the above technical solutions, the paper-flying sensing unit uses infrared light of a specific wavelength as the detection medium, and a narrow-band filter is added to the front end of the receiver. This effectively filters out visible light and other stray light of different wavelengths emitted by the high-brightness white LED exposure light source in the inspection chamber of the quality inspection machine, avoiding false triggering or missed detection of the sensor due to ambient light interference. The through-beam optical path structure ensures that a signal jump will only occur when the paper-flying device completely passes through the optical path, resulting in high detection reliability and strong anti-interference ability, making it especially suitable for harsh working conditions with direct strong light.

[0010] Preferably, when the controller is configured to execute the delay logic, the delay time of the delay logic is an adjustable parameter. The controller is also coupled to a human-machine interface, which is configured to receive delay time modification instructions input by the operator, so that the controller can adjust the delay time online according to the current production speed.

[0011] By implementing the above technical solutions, and by setting the delay time as an adjustable parameter that can be modified online via a human-machine interface, the system can flexibly adapt to different production speeds. When the inspection machine speeds up or down, the operator only needs to adjust the delay value through the human-machine interface to ensure that the air blowing time is always aligned with the exact moment when the paper slides to the optimal rejection position within the arc-shaped channel. This avoids the problem of air blowing too early or too late when the speed changes due to a fixed delay, significantly improving the system's adaptability to varying working conditions and its rejection success rate.

[0012] Preferably, the fly paper sensing unit further includes an auxiliary sensor, which is located at the channel outlet end of the guide recycling bin, downstream of the air-blowing rejection device, and electrically coupled to the controller; the controller is further configured to: after the air-blowing rejection device is started, determine whether the fly paper has been successfully rejected based on the signal output by the auxiliary sensor; if the rejection is determined to be a failure, execute a preset secondary rejection procedure.

[0013] Through the above technical solution, by adding an auxiliary sensor at the outlet of the guide recycling bin and forming a feedback closed loop with the controller, the system can autonomously confirm whether each air-blowing rejection operation is successful. When the fly paper fails to be blown out on the first attempt due to electrostatic adsorption or jamming, the controller can immediately detect the abnormal state and start a secondary rejection procedure without manual intervention. This effectively prevents the fly paper from accumulating in the channel and causing blockages after a single rejection failure, significantly improving the system's autonomous processing capability and long-term operational stability.

[0014] Preferably, the secondary rejection procedure is a pulsed blowing procedure, and the controller is configured to control the blowing rejection device to perform multiple cycles of blowing with alternating blowing and stopping periods.

[0015] Through the above technical solutions, the secondary rejection uses a pulsed air blowing program. Through rapid air blowing / stopping alternating cycles, intermittent impact force can be applied to the surface of the fly paper, effectively overcoming the static friction between the fly paper and the inner wall of the channel. Especially for paper that is stuck to the inner wall due to moisture or electrostatic adsorption, the "oscillation" effect of the pulsed airflow is far better than continuous air blowing, thereby greatly improving the success rate of clearing blockages.

[0016] Preferably, the arc-shaped inner wall surface of the guide recovery bin has a low coefficient of friction to assist the flying paper in sliding on it; the entrance end of the channel is provided with a gradually expanding guide opening that opens toward the flying paper drifting area.

[0017] Through the above technical solutions, the low coefficient of friction of the arc-shaped inner wall surface reduces the resistance of the flying paper sliding in the channel, allowing the flying paper to slide smoothly to the blowing position even when it enters the channel at a low inertial speed, reducing the probability of blockage; at the same time, the design of the gradually expanding guide port at the inlet end increases the capture area, so that even if the flying paper floats in at an angle or flips, it can be effectively collected and guided into the channel, improving the success rate of flying paper capture.

[0018] Preferably, the system further includes: a stacking detection sensor electrically coupled to the controller, installed on the product collection platform, configured to detect the stacking status of the fly paper on the product collection platform, and output a stacking signal when the stacking reaches a preset condition; and a collection and transmission device connected to the product collection platform and electrically coupled to the controller, configured to, in response to the controller's command, transfer the entire stack of fly paper from the product collection platform to a designated location.

[0019] Through the above technical solutions, by setting up a product collection platform, stack detection sensors, and a collection and transmission device, rejected flyers no longer scatter or fall directly into the waste bin, but are automatically stacked on the collection platform. The stack detection sensors can monitor the height of the flyer stack in real time, and when preset conditions are met, the collection and transmission device is triggered to automatically send out the entire stack of flyers, realizing full automation of flyer recycling. No manual sorting or handling is required, further reducing human intervention and improving the overall automation level of the inspection machine.

[0020] A method for capturing and recovering fly paper in the inspection chamber of a quality inspection machine is applied to an inspection chamber of a quality inspection machine. The inspection chamber is equipped with a negative pressure adsorption conveying surface, a high-speed inspection camera, and an exposure light source. The method includes: On the side of the housing facing the direction from which the flying paper comes from, a guide and recovery chamber with an arc-shaped inner wall captures the flying paper at the source of the flying paper and guides it to the collection area. By using a paper-flying sensor unit installed in the guide recycling bin channel, it can detect whether any accidentally flying paper has entered the channel and output a detection signal. The detection signal is received by a controller, and a preset delay logic is executed in response to the detection signal; After the delay logic ends, the controller activates an air-blowing rejection device to blow air toward the collection area, sending the fly paper that has entered the channel to a product collection platform.

[0021] The above technical solution employs a method involving source capture via a guided recovery chamber at the exposure light source, paper-flying sensing within the channel, and delayed logic-controlled air blowing. This creates a closed loop for the entire paper-flying process: capture → detection → delay → rejection. This allows for online, real-time processing of randomly occurring paper-flying events. This method differs fundamentally from existing waste removal methods based on quality detection and counting tracking. It does not rely on judging print quality or require prior knowledge of the paper-flying's position; it relies entirely on physical guidance and real-time sensing. Therefore, it can handle highly random paper-flying positions and postures, exhibiting strong adaptability and robustness.

[0022] Preferably, after the air-blowing rejection device is activated, the method further includes: an auxiliary sensor located at the outlet of the guide recovery bin channel detecting whether the fly paper has passed through; if the controller does not receive a fly paper passing signal from the auxiliary sensor within a preset time window, it is determined that the rejection has failed, and a preset pulse-type secondary air-blowing program is executed.

[0023] By employing the above technical solutions, and by adding an auxiliary sensor confirmation and a pulsed secondary air blowing step after the air blowing rejection step, the method possesses closed-loop feedback verification of rejection results and the ability to self-heal anomalies. This step ensures that each flysheet can be reliably removed from the channel, avoiding system blockage caused by the gradual accumulation of individual rejection failures, thus giving the method higher reliability and fault tolerance.

[0024] Preferably, the method further includes: detecting the stacking state of the fly paper on the product collection platform by a stacking detection sensor; when the stacking reaches a preset condition, the controller controls a collection and transmission device to transfer the entire stack of fly paper from the product collection platform to a designated location.

[0025] By adding stacking status detection and whole-stack transmission steps through the above technical solutions, the automatic sorting and batch transportation of recycled fly paper is realized. This extends the entire recycling process from capturing and removing individual fly papers to orderly collection and automatic transfer, forming a complete automated processing chain. This further reduces the frequency of manual intervention and improves the overall efficiency of the equipment.

[0026] Therefore, the present invention has at least the following beneficial effects: Proactive protection, value preservation: By installing a guide recycling bin at the source of the flying paper, the accidentally flying paper is forcibly guided into a safe channel, physically isolating the flying paper from contact with the precision camera and exposure light source, completely eliminating the hidden danger of damage to core components caused by paper jams, and ensuring the safety of testing components worth hundreds of thousands of yuan.

[0027] Intelligent control, precise and reliable: It adopts air blowing control based on real-time sensing and adjustable delay logic, as well as closed-loop confirmation and pulse secondary rejection mechanism based on outlet auxiliary sensor. Compared with the open-loop control based on counting in the existing technology, it has a faster response speed and higher accuracy, and can effectively cope with the randomness and suddenness of paper flying in high-speed production.

[0028] Turning waste into treasure, fully automated: Flying paper is blown to the collection platform in an orderly manner, automatically stacked and sent out through the collection and transmission device. The product can be completely recycled and reused, reducing the waste loss caused by flying paper to zero. At the same time, it avoids downtime for manual cleaning, ensuring that the quality inspection machine can achieve truly continuous high-speed production. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the fly paper capture and recovery system in the inspection chamber of the quality inspection machine provided in an embodiment of the present invention.

[0030] Figure 2 A schematic diagram of the structure of the recycling bin.

[0031] Figure 3 This is a schematic diagram of the control flow of the controller provided in an embodiment of the present invention. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0033] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. The terms "installation," "connection," and "coupling" should be interpreted broadly; for example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections via an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example

[0034] This embodiment applies the system of the present invention to a sheet-fed inspection machine for inspecting rigid cigarette packaging paper. The machine is designed to inspect at a speed of 300 meters per minute. The product being inspected is standard-sized white cardboard (98mm × 62mm) with a basis weight of 230g / m² and a matte film coating. The inspection chamber contains a negative pressure adsorption conveyor surface, a high-speed linear scanning camera located above the conveyor surface, and an exposure light source located below the camera's field of view and directly facing the conveyor surface. The exposure light source is a 200W high-brightness white LED linear light source, with a surface temperature of 60-70℃. Long-term observation shows that the "flying paper" phenomenon mostly occurs at the tail of the paper, where the tail is flipped upwards by the high-speed airflow, pointing directly at the gap area above the light source.

[0035] like Figure 1 and Figure 2 As shown in the figure, this embodiment provides a fly paper capture and recycling system for a quality inspection machine, including a guide recycling bin, a fly paper sensing unit, an air blowing rejection device, a product collection platform, a stacking detection sensor, a collection and transmission device, and a controller.

[0036] The guide recovery bin is a long, tubular structure with a crescent-shaped cross-section, injection-molded from transparent polycarbonate material for easy observation of its internal structure. The inner diameter R of this arc-shaped tube is 30mm, and the arc's circumference forms a semi-circular groove. The total length L is 400mm, and the wall thickness is 3mm. The guide recovery bin is arranged along the paper conveying direction and is laterally secured to the upper rear housing of the LED linear light source by screws. Its arc-shaped groove opening faces downwards, directly opposite the path of the flying paper. The inner wall of the tube is mirror-polished and coated with a 0.2mm thick anti-static Teflon coating, resulting in a friction coefficient below 0.1, creating a low-friction surface to aid in the smooth gliding of the flying paper. At the front of the channel, the tube wall extends outwards to form a 50mm long, gradually expanding V-shaped guide opening. The maximum width of the inlet opening extends to 120mm, allowing for efficient capture of skewed flying paper with a wide opening. The outlet end of the guide recovery bin leads to the collection area on one side of the product collection platform.

[0037] The fly paper sensing unit includes a main detection sensor and an auxiliary sensor. The main detection sensor is a through-beam infrared photoelectric sensor, with a dedicated sensing light source of a 3W, 850nm wavelength, 3mm spot diameter focused infrared LED, and a receiver of a phototransistor that filters out visible light. Both are embedded on opposite sides of the inner wall of the crescent-shaped tube, 100mm from the channel inlet, ensuring immediate detection once the fly paper has fully entered the channel. An 850nm narrowband filter is installed at the front of the receiver window to perfectly filter out interference from the exposure light source. The auxiliary sensor is the same model of through-beam infrared sensor as the main detection sensor, installed at the outlet of the guide recovery chamber channel, approximately 50mm downstream of the air nozzle, for secondary confirmation that the fly paper has been successfully rejected.

[0038] The air-blowing rejection device includes two F-shaped flat fan-shaped air nozzles, installed 180mm and 300mm from the inlet, respectively, along the length of the arc-shaped channel. The blowing angle of each nozzle is precisely adjusted so that its flat airflow is injected strictly along the tangent of the inner wall of the arc-shaped tube, directed towards the rear collection area. Each nozzle is independently controlled by a two-position three-way high-speed solenoid valve with a response time of 10ms. The air inlet of the solenoid valve is connected to a 0.5MPa compressed air source pipeline provided by the plant. The control coil of the solenoid valve is electrically coupled to the controller, which can simultaneously trigger both solenoid valves, forming two strong, wall-attached pulsed airflows.

[0039] The product collection platform is a 200mm long and 150mm wide stainless steel tray located directly behind the air nozzle, equipped with three-sided baffles to naturally collect the blown-off papers. The stacking detection sensor is a diffuse reflection photoelectric switch, mounted on one side baffle of the tray, with its optical axis parallel to the tray surface, and installed at a height of 5cm above the tray surface. The collection and transmission device is a stepper motor-driven synchronous belt conveyor, whose front end seamlessly connects to the edge of the tray and extends to a collection box at the end.

[0040] The controller uses a Siemens S7-1200 PLC. Its digital input ports are connected to the receiver outputs of the main detection sensor, the receiver outputs of the auxiliary sensor, and the outputs of the stacked detection sensor. The digital output ports are connected to the control terminals of two solenoid valves and the pulse and direction signal terminals of the stepper motor driver. The controller also has a touchscreen human-machine interface coupled via an Ethernet interface, used to display system status and receive parameter modification commands input by the operator.

[0041] The following is combined with Figure 3 The control flowchart is provided to explain the working process and algorithm of this embodiment in detail.

[0042] During normal operation of the inspection machine, the controller executes the following control program in a loop. First, the controller reads the signal status of the main detection sensor in real time. The infrared receiver of the main detection sensor outputs a high-level signal to the controller when there is infrared light. When a piece of scrap paper enters the arc-shaped channel and blocks the light path, the light flux of the receiver decreases, and the output signal jumps to a low level. The controller program captures the falling edge of this signal, and once the falling edge is detected, it determines that scrap paper has entered the channel.

[0043] The program then starts an adjustable delay timer T_delay. The timer's preset delay value is 60ms and can be set and modified online via the human-machine interface. The delay value is determined as follows: After the flying paper enters the guide port, its speed rapidly decreases due to the constraint and friction of the curved inner wall, but it still retains a relatively high linear velocity in the initial stage. At trigger, the flying paper head is 100mm from the inlet, and the first air nozzle is 180mm from the inlet. To achieve the best air blowing effect, air blowing should be initiated when the paper tail is directly opposite the air nozzle; the optimal paper head position at this moment is approximately 160mm. Theoretically, based on the flying paper's average sliding speed of 0.5m / s in the channel, the required delay time is approximately (160-100) / 500 = 0.12s = 120ms. However, the initial section of the paper entering the channel retains a relatively high linear velocity (close to the inspection machine's conveyor speed of 5 m / s), which gradually decreases to a stable sliding speed under friction. Therefore, the actual time for the paper to reach the blowing position after triggering is much shorter than the result calculated based on the average speed. Through actual debugging, at a production speed of 300 m / min, a preset value of 60 ms ensures a precise match between the blowing time and the paper's arrival at the blowing position. When the inspection machine slows down to 200 m / min, the operator can increase the delay value to 90 ms via the human-machine interface to adapt to the reduced paper sliding speed. The specific adjustment can be calculated online using the following formula: T_delay=(D_trigger_to_nozzle-L_overlap) / V_slide-T_valve_response. Where D_trigger_to_nozzle is the arc distance (in meters) from the main sensor installation position to the air nozzle, L_overlap is the offset (in meters) related to the length difference between the paper tail and the paper head, V_slide is the measured average sliding speed (in meters per second), and T_valve_response is the solenoid valve response time (in seconds). The controller can also store a speed-delay lookup table, which automatically looks up the delay value based on the production speed set through the human-machine interface.

[0044] After the delay timer T_delay ends, the controller immediately sets two digital output points, energizing two high-speed solenoid valves. Compressed air is then ejected through the nozzle along the tangential direction of the arc-shaped inner wall, continuously blowing for 200ms (controlled by another timer T_blow). The airflow pushes the flypaper along the inner wall to the product collection platform.

[0045] After a single air blowing cycle, the controller checks the signal from the auxiliary sensor. Under normal operating conditions, the auxiliary sensor outputs a high level when there is no paper and a low level when paper passes through. The program presets a time window T_window of 500ms, starting from the start of air blowing. If the controller detects a falling edge of the auxiliary sensor signal within this time window (indicating successful paper passage), it clears the relevant flags and returns to the main loop to continue monitoring. If no falling edge is detected after T_window expires, it is considered a failed rejection. The controller then executes a preset secondary rejection procedure: first, it closes the solenoid valve; after a 50ms interval, it starts a pulse air blowing sequence—with a cycle of 50ms air blowing and 50ms stop, repeated 5 times. The calculation formula for this pulse air blowing can be expressed as follows: for cycle numbers i from 1 to N (N=5), the output state is: when (time mod 100ms) < 50ms, the solenoid valve opens; otherwise, it closes. This algorithm utilizes intermittent impact force to overcome the static friction between the paper and the inner wall, achieving unblocking.

[0046] After the flyers are successfully blown into the product collection platform, they gradually stack neatly. The diffuse reflection photoelectric switch of the stack detection sensor continuously monitors the height of the stack. When the stack height reaches 5cm and blocks the switch, the sensor output signal changes from low to high. The controller detects this high-level signal and performs a 1-second anti-jitter filter to avoid momentary interference. If the signal remains high for more than 1 second, the stacking is considered complete. The controller then sends 800 pulse signals to the stepper motor driver (the driver is microstepped to 400 pulses per revolution, the motor rotates 2 revolutions, and after deceleration by the synchronous belt, the corresponding conveyor belt displacement is 300mm), driving the collection conveyor belt forward 300mm, delivering the entire stack of flyers (approximately 200 sheets) to the collection box at the end. The controller then resets the stacking completion flag, the conveyor belt stops, and the system continues to the next cycle.

[0047] Through the above-described specific implementation methods, this system successfully transforms over 99% of fly paper incidents into orderly product recycling. The added adaptive delay, outlet auxiliary confirmation, and pulse blowing schemes enable the system to maintain highly reliable and flexible fly paper rejection capabilities regardless of machine speed, air source, or installation environment. This thoroughly protects the valuable core detection components, reduces waste losses by hundreds of thousands of yuan annually, and allows for long-term continuous operation of the inspection machine without shutdown.

[0048] In this embodiment, all control logic of the controller is implemented through PLC ladder diagram program. The program flow is clear, the response is real time, no additional image processing or complex calculation unit is required, and the cost is low and the reliability is high.

Claims

1. A paper capture and recovery system for a quality inspection machine's inspection chamber, wherein the inspection chamber is equipped with a negative pressure adsorption conveying surface, a high-speed inspection camera, and an exposure light source, characterized in that... The system includes: The guide and recovery bin is a semi-enclosed long tubular structure with an arc-shaped inner wall. It is fixedly installed on the side of the housing facing the direction of the flying paper of the exposure light source. It is configured to capture the flying paper at the source of the flying paper and guide the captured flying paper to the collection area through the channel formed by its arc-shaped inner wall. The fly paper sensing unit is located inside the channel of the guide and recycling bin and is configured to detect whether any accidentally flying paper enters the channel and output a detection signal. An air-blowing rejection device is coupled to a compressed air source, and its air outlet is located on the wall of the guide recovery chamber. It is configured to blow air in a controlled manner toward the collection area to blow out the fly paper that has entered the channel. The product collection platform is set in the collection area, facing the air blowing direction of the air blowing rejection device, and is configured to receive the blown-out fly paper. The controller is electrically coupled to the paper-flying sensing unit and the air-blowing rejection device, and is configured to respond to the detection signal output by the paper-flying sensing unit, execute a preset delay logic, and then start the air-blowing rejection device to perform the air-blowing rejection operation.

2. The paper capture and recovery system for the inspection chamber of a quality inspection machine according to claim 1, characterized in that, The paper-flying sensing unit includes a dedicated sensing light source and a photoelectric receiver matched with the dedicated sensing light source. The two are respectively disposed on opposite side walls of the arc-shaped guide channel, forming a through-beam optical path that traverses the interior of the channel. The dedicated sensing light source is configured to emit infrared light of a specific wavelength, and the front end of the photoelectric receiver is equipped with a narrowband filter that matches the specific wavelength to counteract interference from the exposure light source in the detection chamber.

3. The paper capture and recovery system for the inspection chamber of a quality inspection machine according to claim 2, characterized in that, When the controller is configured to execute the delay logic, the delay time of the delay logic is an adjustable parameter. The controller is also coupled to a human-machine interface, which is configured to receive delay time modification instructions input by the operator, so that the controller can adjust the delay time online according to the current production speed.

4. The paper capture and recovery system for the inspection chamber of a quality inspection machine according to claim 2, characterized in that, The fly paper sensing unit also includes an auxiliary sensor, which is located at the channel outlet end of the guide recycling bin, downstream of the air-blowing rejection device, and electrically coupled to the controller; the controller is further configured to: after the air-blowing rejection device is started, determine whether the fly paper has been successfully rejected based on the signal output by the auxiliary sensor; if the rejection is determined to be unsuccessful, execute a preset secondary rejection procedure.

5. The paper capture and recovery system for the inspection chamber of a quality inspection machine according to claim 4, characterized in that, The secondary rejection procedure is a pulsed blowing procedure, and the controller is configured to control the blowing rejection device to perform multiple cycles of blowing with alternating blowing and stopping periods.

6. The paper capture and recovery system for the inspection chamber of a quality inspection machine according to claim 1, characterized in that, The arc-shaped inner wall surface of the guide recovery bin has a low coefficient of friction to assist the flying paper in sliding on it; the entrance end of the channel is provided with a gradually expanding guide opening that opens towards the flying paper drifting area.

7. The paper capture and recovery system for the inspection chamber of a quality inspection machine according to claim 1, characterized in that, Also includes: A stacking detection sensor, electrically coupled to the controller, is installed on the product collection platform and configured to detect the stacking status of the flying paper on the product collection platform and output a stacking signal when the stacking reaches a preset condition; A collection and transmission device is connected to the product collection platform and electrically coupled to the controller, configured to, in response to the controller's instructions, transfer an entire stack of flypaper from the product collection platform to a designated location.

8. A method for capturing and recovering fly paper in the inspection chamber of a quality inspection machine, using the fly paper capture and recovery system for the inspection chamber of a quality inspection machine as described in any one of claims 1-7, characterized in that, include: On the side of the housing facing the direction from which the flying paper comes from, a guide and recovery chamber with an arc-shaped inner wall captures the flying paper at the source of the flying paper and guides it to the collection area. By using a paper-flying sensor unit installed in the guide recycling bin channel, it can detect whether any accidentally flying paper has entered the channel and output a detection signal. The detection signal is received by a controller, and a preset delay logic is executed in response to the detection signal; After the delay logic ends, the controller activates an air-blowing rejection device to blow air toward the collection area, sending the fly paper that has entered the channel to a product collection platform.

9. A method for capturing and recovering fly paper in the inspection chamber of a quality inspection machine according to claim 8, characterized in that, After the air-blowing rejection device is activated, the following steps are also included: An auxiliary sensor located at the outlet of the guide recycling bin channel detects whether the flying paper has passed through; If the controller does not receive a paper passing signal from the auxiliary sensor within a preset time window, it determines that the rejection has failed and executes a preset pulse-type secondary air blowing program.

10. A method for capturing and recovering fly paper in the inspection chamber of a quality inspection machine according to claim 8, characterized in that, Also includes: The stacking status of the flypaper on the product collection platform is detected by a stack detection sensor; When the stacking reaches the preset conditions, the controller controls a collection and transmission device to move the entire stack of fly paper from the product collection platform to the designated location.

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