Corrugated board anti-warping regulation and control device and method

Abstract

The invention relates to a corrugated board anti-warping regulation and control device and method, and relates to the technical field of corrugated board warping prevention, and the corrugated board anti-warping regulation and control device comprises a warping detection unit, an upper side function unit, a lower side function unit, a circulating exhaust system, a central control unit and an auxiliary flattening device. Wherein the warping detection unit is used for scanning the outline of a paperboard in real time; the central control unit analyzes the data and generates a regulation and control instruction; the upper side functional unit and the lower side functional unit are used for carrying out asymmetrical regulation and control on hot air drying and steam humidifying on paperboards respectively; the circulating exhaust system manages the environment in the box and recycles condensate water; and the auxiliary flattening device is used for carrying out flexible rolling shaping on the paperboard. According to the method, the internal stress of the paperboard is adjusted through the complete process of real-time detection, intelligent decision making, asymmetric regulation and control, flexible shaping and closed-loop optimization, online, accurate and self-adaptive prevention and correction of warping are achieved, and the paperboard flatness, the production efficiency and the product percent of pass are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of anti-warping technology for corrugated cardboard, and in particular to an anti-warping control device and method for corrugated cardboard. Background Technology

[0002] Currently, corrugated cardboard warping is a common defect in its production process. It manifests as the cardboard warping upwards, downwards, or S-shaped bending after cross-cutting or during storage. The root cause of warping lies in the uneven distribution of internal stress caused by asynchronous changes in tension, humidity, and temperature among the cardboard's constituent layers—face paper, liner paper, and corrugated core paper—during the forming, drying, and cooling processes. Warped cardboard seriously affects the efficiency of subsequent printing, die-cutting, and gluing processes, as well as the stacking strength and appearance quality of finished cartons.

[0003] In existing technologies, solutions to warping are mostly passive and involve localized adjustments:

[0004] Process parameter adjustment based on experience: Operators manually adjust the production line speed, preheater wrap angle, glue application amount, etc. based on experience. The adjustment is lagging and cannot be quantified, resulting in unstable effects.

[0005] Physical pressing: Fixed pressure rollers or gravity bars are set in the conveyor section to try to force flatten the paperboard. This method cannot eliminate internal stress, which can easily lead to stress concentration or indentation damage. The paperboard often bounces back after it leaves the conveyor.

[0006] Coarse humidification: Water or steam is sprayed onto the warped surface to humidify it and the paper absorbs moisture and expands to correct it. However, the traditional method is not precise in controlling the amount of water, which can easily cause water stains, local over-softening or insufficient correction, and cannot achieve dynamic closed-loop control.

[0007] Therefore, there is an urgent need for an integrated solution that can prevent and correct corrugated cardboard warping online, in real time, accurately, and adaptively. Summary of the Invention

[0008] The purpose of this application is to provide a device and method for preventing warping of corrugated cardboard, so as to solve the problems mentioned in the background art.

[0009] On the one hand, the anti-warping control device for corrugated cardboard provided in this application adopts the following technical solution: it includes a roller conveyor, a control box and a warping detection unit. The control box is installed inside the roller conveyor. The warping detection unit is installed outside the feed end of the control box. It also includes an upper functional unit installed at the upper end of the control box, a lower functional unit installed at the lower end of the control box, a circulating exhaust system installed on one side inside the control box, a central control unit set outside the control box, and an auxiliary flattening device installed inside the control box and adjacent to its discharge end.

[0010] The upper functional unit includes a wind box, which is located on the top of the control box. A temperature controller is installed at the lower left end of the wind box. A filter screen is locked at the air inlet end of the wind box. A first fan is installed inside the wind box. A heating coil is located opposite the bottom of the first fan and is snapped into the lower part of the wind box. A conveying pipe is connected to the bottom of the wind box. Partitioned air ducts are arranged at the bottom of the conveying pipe. Controllable air nozzles are arrayed at the bottom of the partitioned air ducts.

[0011] The lower functional unit includes a water tank installed at the lower end of the control box. A steam generator is installed on the top of the water tank. A pressure reducing valve is connected to the exhaust end of the steam generator via a flange. A gas supply pipe is bolted to the exhaust end of the pressure reducing valve. The upper end of the gas supply pipe is locked to the inlet end of the steam-water separator. The steam-water separator is installed on the upper end of the steam generator via a bracket. An insulated pipe is connected to the exhaust end of the steam-water separator. The top of the insulated pipe is connected to the steam collection box. Nozzles are arranged in an array on the top of the steam collection box.

[0012] By adopting the above technical solution, which integrates a complete functional module of detection, asymmetric temperature and humidity control and physical shaping, and the combination of upper hot air drying and lower steam humidification, a fundamental shift from passive correction to active prevention is achieved. The central control unit coordinates all modules to ensure the accuracy and automation of control.

[0013] Preferably, the circulating exhaust system includes a connecting box, which is installed on one side of the inner wall of the control box, and a filter plate is locked at the air inlet end of the connecting box. A second fan is installed inside the connecting box. A steam filter box is fixed to one end of the connecting box away from the inside of the control box. A condenser plate is arranged inside the steam filter box. An exhaust pipe is provided at one end of the steam filter box away from the connecting box. A first collection pipe is connected to the bottom of the steam filter box. A second collection pipe is installed at equal intervals at the bottom of the first collection pipe, and the bottom of the second collection pipe is connected to a water tank.

[0014] By adopting the above technical solution, the effective management of the humid and hot environment inside the control box is achieved. The second fan actively discharges excess moisture to prevent steam from condensing and dripping from the top of the box, causing water stains on the cardboard. The condenser plate condenses and recovers water vapor, and returns it to the water tank through the first and second collection pipes, realizing the recycling of water resources, saving energy and protecting the environment, while maintaining stable operating conditions inside the box.

[0015] Preferably, the auxiliary flattening device includes a fixed frame, which is locked to one side of the inner wall of the control box. A cylinder is installed in the middle of the upper end of the fixed frame, and a docking block is connected to the bottom of the cylinder. A connecting rod is inserted into the docking block. Side plates are installed on both sides of the connecting rod, and the top of the side plates on both sides are slidably connected to the fixed frame. A rotating cylinder is rotatably installed between the side plates on both sides, and a motor is connected to the left side of the rotating cylinder. A transmission groove is opened on the outside of the rotating cylinder, and the inside of the transmission groove is connected to the outer end of the pressure roller. A guide rod is inserted into the upper end of the pressure roller, and the guide rod is fixed to the side plates on both sides.

[0016] By adopting the above technical solution, the cylinder can adjust the initial height of the auxiliary flattening device as a whole, the motor drives the rotating drum to rotate, and through the transmission groove, it drives multiple pressure rollers to reciprocate, so as to gently roll the cardboard that has become flat after temperature and humidity control, which helps to further eliminate micro stress, ensure stable output of cardboard flatness, and avoid damage or stress rebound that may be caused by simple rigid pressure rollers.

[0017] Preferably, the pressure roller component includes a first housing, which is connected to a transmission groove via a shaft. A convex shaft is slidably inserted into one side of the first housing. A push rod is inserted inside the first housing, with its upper end aligned with the convex shaft. The bottom of the push rod is inserted into the second housing. A positioning rod is fixed inside the second housing, and it is inserted into the bottom of the push rod. A spring is provided on the outside of the positioning rod. A pressure roller frame is fixed at the bottom of the second housing. A pressure roller is rotatably installed inside the pressure roller frame. The convex shaft abuts against the outer side of the guide plate, and both sides of the guide plate are locked to the side plates.

[0018] By adopting the above technical solution, when the drum rotates, the cam shaft moves along the contour of the guide plate and transmits the motion to the second receiving shell through the push rod, driving the pressure roller to generate a composite displacement of vertical and horizontal. The spring provides continuous elastic pressure, enabling the pressure roller to adapt to the slight undulations of the cardboard surface, which not only ensures the flattening effect, but also avoids hard scratches or excessive pressure on the cardboard surface.

[0019] Preferably, the warpage detection unit is a multi-line laser profile scanner, and the detection surface of the warpage detection unit faces the running plane of the corrugated cardboard of the roller conveyor.

[0020] By adopting the above technical solution, namely the multi-line laser profile scanner, three-dimensional profile data of the cardboard cross-section can be acquired non-contactly, at high speed and with high precision, and the accurate warp height, direction and shape distribution can be calculated in real time. This provides a reliable and quantitative data basis for the intelligent decision-making of the central control unit, which is a prerequisite for achieving precise control.

[0021] Preferably, both the controllable air nozzle and the nozzle are arranged along the width direction of the cardboard, and the nozzle is set in the shape of a slit nozzle.

[0022] By adopting the above technical solution, which is arranged along the width direction, the possibility of independent control of the zones is realized. This allows the device to perform differentiated treatment for the warping of different areas of the cardboard. The slit nozzles can generate a uniform and wide-coverage steam curtain, ensuring the uniformity and controllability of humidification of the target area on the lower surface of the cardboard, and avoiding point-like over-wetting or drying dead zones.

[0023] Preferably, the condenser plates are installed vertically alternately up and down along the inside of the air filter box, and the number of condenser plates is not less than three.

[0024] By adopting the above technical solution, namely, multiple condenser plates installed vertically in alternating positions, the contact area and path length between the hot and humid airflow and the condensation surface are greatly increased, thereby improving condensation efficiency, ensuring that most of the water vapor can be effectively condensed and recovered, improving the water resource recovery rate, and at the same time reducing the humidity of the exhaust gas and optimizing the working environment.

[0025] Preferably, the transmission grooves are gradually inclined from the middle to both sides along the rotating drum, and the number of transmission grooves is consistent with the number of pressure rollers.

[0026] By adopting the above-mentioned technical solution, namely the design of the transmission groove that gradually slopes from the middle to both sides, when the drum rotates at a constant speed, the pressure rollers connected in different transmission grooves will produce left and right movements with different phases and amplitudes.

[0027] Preferably, the bottom of the guide plate has concave grooves at equal intervals, and the adjacent concave grooves form a wavy profile.

[0028] By adopting the above-mentioned technical solution, namely the guide plate with regular concave grooves and convex contours, a preset motion trajectory is provided for the convex shaft. This allows the pressure roller to produce regular and periodic undulating motion according to the contour of the guide plate while the pressure roller revolves with the rotating drum. This further enhances the kneading effect and can more effectively handle slight warping or local unevenness.

[0029] On the other hand, a method for anti-warping control of corrugated cardboard is also proposed, including the following steps:

[0030] S1. Real-time detection: When the corrugated cardboard is running on the roller conveyor, the warpage detection unit performs a non-contact scan of its surface contour to obtain real-time warpage shape, height and direction data.

[0031] S2, Analysis and Decision: The central control unit receives and analyzes the data from step S1, identifies the warped concave and convex areas, and calculates the control parameters for each partition of the upper and lower functional units.

[0032] S3. Asymmetric control: Based on the decision in step S2, the central control unit synchronously drives the upper and lower functional units: for the lower area corresponding to the identified concave surface of the cardboard, it controls the corresponding nozzles to open for precise steam humidification; for the upper area corresponding to the identified convex surface of the cardboard, it controls the corresponding controllable nozzles to output heated airflow for drying.

[0033] S4. Assisted leveling and exhaust gas treatment: While temperature and humidity are controlled, the circulating exhaust system continues to work to expel moisture from the box and recover condensate; after being controlled, the cardboard, which tends to be flat, is then subjected to a final gentle rolling and shaping by the auxiliary flattening device.

[0034] S5. Closed-loop optimization: The temperature and humidity sensor network feeds back the environmental data inside the box to the central control unit. Combined with the cardboard exit status, the control model parameters are adaptively fine-tuned to achieve continuous optimization of the production process.

[0035] By adopting the above technical solution, which organically combines high-precision detection, intelligent decision-making, asymmetric temperature and humidity control, flexible physical shaping, and closed-loop environmental management, the core of which lies in the closed-loop logic of "detection-analysis-targeted control-shaping-feedback optimization", it not only achieves rapid correction of warping but also enables preventive intervention in the production process through continuous optimization, significantly improving the stability of cardboard flatness and production efficiency, and solving the pain points of traditional methods such as lag, roughness, and uncontrollability.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. This application establishes an online detection and intelligent decision-making system consisting of a warping detection unit and a central control unit, which enables real-time, non-contact, high-precision detection and intelligent analysis of the warping state of corrugated cardboard, replacing the traditional manual adjustment method and providing a reliable data foundation for subsequent precise control.

[0038] 2. This application establishes an asymmetric temperature and humidity control system consisting of an upper functional unit and a lower functional unit. Based on the test results, it can perform differentiated treatment of different warped areas of the cardboard by upper drying and lower steaming, thereby adjusting the internal stress from the root cause, effectively correcting and preventing warping, with stable results and low relapse rate.

[0039] 3. This application achieves proactive management of the humid and hot environment inside the control box and recycling of water resources by setting up a circulating exhaust system, effectively preventing steam condensation and dripping pollution, maintaining a stable working environment, and achieving energy-saving and environmental protection effects.

[0040] 4. This application uses an auxiliary flattening device to perform dynamic and flexible composite rolling on the temperature and humidity controlled cardboard, further eliminating microscopic residual stress and achieving final flatness and shaping, thus avoiding surface damage that may be caused by traditional rigid pressure rollers.

[0041] 5. This application transforms the traditional passive and lagging warping treatment method into an active and precise online closed-loop control through an intelligent process of real-time detection, analysis and decision-making, asymmetric control, assisted shaping, and closed-loop optimization. Its core lies in using asymmetric temperature and humidity control to directly act on the root cause of warping stress, and combining it with flexible rolling to eliminate residual stress, effectively preventing and correcting warping from the source, significantly improving the flatness, production efficiency, and product qualification rate of corrugated cardboard, and realizing full-process automation and continuous optimization. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0043] Figure 2 This is a frontal view of the internal structure of an embodiment of this application;

[0044] Figure 3 This is a front view of the internal structure of the upper functional unit in an embodiment of this application;

[0045] Figure 4 This is a front view structural diagram of the lower functional unit in an embodiment of this application;

[0046] Figure 5 This is a schematic diagram of the circulating exhaust system structure according to an embodiment of this application;

[0047] Figure 6 This is a schematic diagram of the right-side cross-sectional structure of the circulating exhaust system according to an embodiment of this application;

[0048] Figure 7 This is a front view schematic diagram of the auxiliary flattening device according to an embodiment of this application;

[0049] Figure 8 This is a three-dimensional structural diagram of the auxiliary flattening device according to an embodiment of this application;

[0050] Figure 9 This is a schematic diagram of the three-dimensional structure of the auxiliary flattening device according to an embodiment of this application;

[0051] Figure 10 This is a rear-view perspective view of the pressure roller component according to an embodiment of this application;

[0052] Figure 11 This is a schematic diagram of the cross-sectional structure of the pressure roller component according to an embodiment of this application;

[0053] Figure 12This is a schematic diagram illustrating the method of using the anti-warping control device according to an embodiment of this application.

[0054] Explanation of reference numerals in the attached drawings: 1. Roller conveyor; 2. Control box; 3. Warpage detection unit; 4. Upper functional unit; 41. Air box; 42. Thermostat; 43. Filter screen; 44. First fan; 45. Heating coil; 46. Conveying pipe; 47. Zoned air duct; 48. Controllable air nozzle; 5. Lower functional unit; 51. Water tank; 52. Steam generator; 53. Pressure reducing valve; 54. Gas supply pipe; 55. Steam-water separator; 56. Insulated pipeline; 57. Steam collection box; 58. Nozzle; 6. Circulating exhaust system; 61. Connecting box; 62. Filter plate; 63. Second fan 64. Air filter box; 65. Condensing plate; 66. Exhaust pipe; 67. First collection pipe; 68. Second collection pipe; 7. Central control unit; 8. Auxiliary flattening device; 81. Fixing frame; 82. Cylinder; 83. Connecting block; 84. Connecting rod; 85. Side plate; 86. Rotary drum; 87. Motor; 88. Transmission groove; 89. Pressure roller; 891. First housing; 892. Protruding shaft; 893. Push rod; 894. Second housing; 895. Positioning rod; 896. Spring; 897. Pressure roller frame; 898. Pressure roller; 899. Guide plate; 810. Guide rod. Detailed Implementation

[0055] The following is in conjunction with the appendix Figure 1 -Appendix Figure 12 This application will be described in further detail below.

[0056] A corrugated cardboard anti-warping control device, referring to Figures 1-2 The system includes a roller conveyor 1, a control box 2, a warpage detection unit 3, an upper functional unit 4, a lower functional unit 5, a circulating exhaust system 6, a central control unit 7, and an auxiliary flattening device 8. The control box 2 is installed inside the roller conveyor 1. The warpage detection unit 3 is installed outside the feed end of the control box 2. This unit is preferably a multi-line laser profile scanner. Its detection surface faces the paperboard running plane on the conveyor and can acquire the three-dimensional profile data of the paperboard cross-section in real time without contact, providing initial warpage shape, height, and direction information for subsequent precise control. At the same time, an infrared temperature measurement array can be optionally equipped to synchronously monitor the initial temperature distribution of the upper and lower surfaces of the paperboard. The system also includes an upper functional unit 4 installed at the upper end of the control box 2, a lower functional unit 5 installed at the lower end of the control box 2, a circulating exhaust system 6 installed on one side inside the control box 2, a central control unit 7 located outside the control box 2, and an auxiliary flattening device 8 installed inside the control box 2 and adjacent to its discharge end.

[0057] The central control unit 7 is located outside the control box 2 and is electrically connected to the motor 87 and cylinder 82 of the warp detection unit 3, the upper functional unit 4, the lower functional unit 5, the circulating exhaust system 6, and the auxiliary flattening device 8. It has a built-in temperature and humidity coupling control model. Based on real-time warp data, combined with the cardboard speed and the characteristics of the raw paper, the model calculates the target temperature difference and humidity difference between the upper and lower surfaces required to correct the current warp. It further decomposes the model into temperature / airflow commands for each upper air nozzle and on / off duration / steam flow commands for each lower steam nozzle. The central control unit 7 receives the scanning data from the warp detection unit 3 in real time, analyzes and identifies the warped concave and convex areas of the cardboard, and calculates the temperature and humidity control commands for each zone of the upper and lower surfaces required to correct the current warp, combined with parameters such as the cardboard running speed and preset raw paper characteristics. The commands are then sent to the corresponding actuators. The control box 2 is also equipped with a temperature and humidity sensor network, which can monitor the environmental parameters of different areas inside the box in real time.

[0058] Reference Figure 3 The upper functional unit 4 includes a bellows 41, which is located on top of the control box 2. The bellows 41 serves as the assembly housing, with an air inlet at its top. A filter 43 is bolted to the air inlet. A first fan 44 is bolted inside the bellows 41, with its outlet facing downwards. A heating coil 45 is fixed within the bellows 41 below the first fan 44, ensuring uniform airflow across its surface. A thermostat 42 is mounted on the outer wall of the bellows 41, with its temperature sensor probe extending into the bellows 41 or close to the heating coil 45. Its control output is connected to the power controller of the heating coil 45 via a cable. An air outlet is located at the bottom of the bellows 41, sealed to the upper end of a conveying pipe 46 via a flange or clamp. The lower end of the conveying pipe 46 connects to multiple partitioned air ducts 47 arranged parallel to the width of the cardboard. The upper end is connected, and the partitioned air duct 47 is fixed to the top of the control box 2 by the bracket. At the bottom of each partitioned air duct 47, controllable air nozzles 48 are installed in an array through threaded interfaces at a certain interval. Each controllable air nozzle 48 integrates an electric air valve. The control lines of the air valve are connected to the corresponding output terminal of the central control unit 7. That is, after the outside air is purified by the filter screen 43, it is sent into the air box 41 by the first fan 44. It flows through the heating coil 45 and is heated into clean hot air. The hot air is distributed to multiple partitioned air ducts 47 arranged along the width direction of the cardboard through the delivery pipe 46. Finally, it is blown onto the upper surface of the cardboard through the array of controllable air nozzles 48. The temperature controller 42 is linked with the heating coil 45 to achieve precise control of the outlet air temperature. The air volume of each controllable air nozzle 48 or air nozzle group can be adjusted independently, thereby realizing differentiated heating and drying of different areas of the upper surface of the cardboard.

[0059] Reference Figure 4The lower functional unit 5 includes a water tank 51, which is installed at the lower end of the control box 2. A steam generator 52 is installed on the top of the water tank 51. A pressure reducing valve 53 is connected to the exhaust end of the steam generator 52 via a flange. A gas supply pipe 54 is bolted to the exhaust end of the pressure reducing valve 53. The upper end of the gas supply pipe 54 is locked to the inlet end of the steam-water separator 55. The steam-water separator 55 is installed on the upper end of the steam generator 52 via a bracket. An insulated pipe 56 is connected to the exhaust end of the steam-water separator 55. The top of the insulated pipe 56 is connected to a steam collection box 57. The top of the steam collection box 57 has nozzles arranged in an array. 58, namely water tank 51 supplies water, steam generator 52 generates saturated steam, after pressure stabilization by pressure reducing valve 53, it is transported to steam-water separator 55 through gas pipeline 54 to remove liquid water and obtain dry steam. The dry steam is transported to steam collection box 57 through heat preservation pipeline 56, and finally sprayed evenly and controllably onto specific areas of the lower surface of the cardboard by slit nozzles 58 arranged in an array along the width direction of the cardboard, to achieve precise humidification and micro-heating. The nozzles 58 are usually grouped and controlled by independent solenoid valves to achieve independent spraying in different areas. The liquid water flows back to water tank 51 for water resource recycling and reuse.

[0060] Reference Figures 5-6 The circulating exhaust system 6 includes a connecting box 61, which is bolted to the inner wall of one side of the control box 2. The opening facing the inside of the box is the air inlet, where a filter plate 62 is installed. A second fan 63 is installed inside the connecting box 61, with its air inlet facing the filter plate 62 and its air outlet facing the other side of the connecting box 61. A steam filter box 64 is fixed to the end of the connecting box 61 away from the inside of the control box 2. Condensation plates 65 are arranged inside the steam filter box 64. An exhaust pipe 66 is provided at the end of the steam filter box 64 away from the connecting box 61, and a first collection pipe 67 is connected to the bottom of the steam filter box 64. The bottom of the first collection pipe 67 is equidistant from the connecting box 61. A second collection pipe 68 is installed, and the bottom of the second collection pipe 68 is connected to the water tank 51. That is, after the second fan 63 is started, the hot and humid air in the control box 2 is drawn into the connecting box 61 through the filter plate 62 and sent into the steam filter box 64. Multiple condensing plates 65 are vertically installed alternately inside the steam filter box 64. When the hot and humid air flows through, water vapor condenses into water on the surface of the condensing plate 65. The condensed water flows down the plate surface and is collected through the first collection pipe 67 and the second collection pipe 68. Finally, it flows back to the water tank 51 for recycling. The dehumidified air is discharged through the exhaust pipe 66, which effectively prevents steam from condensing and dripping from the top of the box and contaminating the cardboard. At the same time, it is energy-saving and environmentally friendly.

[0061] Reference Figures 7-9The auxiliary flattening device 8 includes a fixed frame 81, which is locked to one side of the inner wall of the control box 2. A cylinder 82 is installed at the middle of the upper end of the fixed frame 81. A docking block 83 is connected to the bottom of the cylinder 82. Two connecting rods 84 are horizontally fixedly inserted inside the docking block 83. Side plates 85 are installed on both sides of the two connecting rods 84, and the top of the side plates 85 slides and docks with the fixed frame 81. A rotating drum 86 is rotatably installed between the two side plates 85, and a motor 87 is docked to the left side of the rotating drum 86. Multiple transmission grooves 88 are opened on the outside of the rotating drum 86, and the interior of each of the multiple transmission grooves 88 is connected to the pressure roller. The outer ends of the components 89 are connected, and two guide rods 810 are inserted inside the upper end of the pressure roller component 89 for guidance. The two guide rods 810 are fixed to the side plate 85 on both sides. That is, the cylinder 82 can adjust the initial height of the auxiliary flattening device 8 as a whole. The motor 87 drives the rotating drum 86 to rotate, and drives multiple pressure roller components 89 to reciprocate through the transmission groove 88. This gently rolls the cardboard, which has become flat after temperature and humidity control, with a kneading effect. This helps to further eliminate micro-stress, ensure stable output of cardboard flatness, and avoid damage or stress rebound that may be caused by simple rigid pressure rollers.

[0062] Reference Figures 10-11 The pressure roller component 89 includes a first housing 891, which is connected to a transmission groove 88 via a shaft. A convex shaft 892 is slidably inserted into one side of the first housing 891. A push rod 893 is inserted inside the first housing 891, with its upper end aligned with the convex shaft 892. The bottom of the push rod 893 is inserted into a second housing 894. A positioning rod 895 is fixed inside the second housing 894, and it is inserted into the bottom of the push rod 893. A spring 896 is provided outside the positioning rod 895. A pressure roller frame 897 is fixed to the bottom of the second housing 894. The roller frame 897 has a pressure roller 898 rotatably mounted inside. The outer side of the convex shaft 892 abuts against the outer side of the guide plate 899, and both sides of the guide plate 899 are locked to the side plate 85. When the rotating drum 86 rotates, the convex shaft 892 moves along the contour of the guide plate 899 and transmits the motion to the second housing 894 through the push rod 893, driving the pressure roller 898 to produce a compound displacement of vertical and horizontal. The spring 896 provides continuous elastic pressure, so that the pressure roller 898 can adapt to the slight undulations of the cardboard surface, which not only ensures the flattening effect, but also avoids hard scratches or excessive pressure on the cardboard surface.

[0063] Among them, the controllable air nozzle 48 and the nozzle 58 are arranged along the width direction of the cardboard, and the nozzle 58 is set in the shape of a slit nozzle, that is, the arrangement along the width direction realizes the possibility of independent control of the zone, so that the device can perform differentiated treatment for the warping of different areas of the cardboard. The slit nozzle can generate a uniform and wide-coverage steam curtain, ensuring the uniformity and controllability of humidification of the target area on the lower surface of the cardboard, and avoiding point-like over-humidification or drying dead corners.

[0064] The condenser plate 65 is installed vertically and alternately inside the air filter box 64, and there are no fewer than three condenser plates 65 installed vertically and alternately. This greatly increases the contact area and path length between the hot and humid airflow and the condenser surface, improves the condensation efficiency, ensures that most of the water vapor can be effectively condensed and recovered, improves the water resource recovery rate, and at the same time reduces the humidity of the exhaust gas and optimizes the working environment.

[0065] The transmission grooves 88 are gradually inclined from the middle to both sides along the rotating drum 86, and the number of transmission grooves 88 is consistent with the number of pressure rollers 89. That is, the design of the transmission grooves 88 that gradually inclines from the middle to both sides makes it possible for the pressure rollers 89 connected in different transmission grooves 88 to produce left and right movements with different phases and amplitudes when the rotating drum 86 rotates at a constant speed.

[0066] The guide plate 899 has concave grooves at equal intervals at its bottom, and the adjacent concave grooves form a wave-shaped profile. The guide plate 899 with regular concave grooves and raised profiles provides a preset motion trajectory for the convex shaft 892. This allows the pressure roller 898 to produce regular and periodic undulating motion according to the profile of the guide plate 899 while the pressure roller 89 revolves with the rotating drum 86. This further enhances the kneading effect and can more effectively handle slight warping or local unevenness.

[0067] A method for adjusting the anti-warping device of corrugated cardboard, see reference. Figure 12 This includes the following steps:

[0068] S1. Real-time detection: When the corrugated cardboard is running on the roller conveyor 1, the warping detection unit 3 performs a non-contact scan of its surface contour to obtain real-time warping shape, height and direction data.

[0069] S2, Analysis and Decision: The central control unit 7 receives the data from step S1, analyzes it through the built-in temperature and humidity coupling control model, identifies the warped concave and convex areas, and calculates the control parameters for each partition of the upper functional unit 4 and the lower functional unit 5.

[0070] S3. Asymmetric control: According to the decision in step S2, the central control unit 7 synchronously drives the upper functional unit 4 and the lower functional unit 5: for the lower area corresponding to the identified concave surface of the cardboard, the corresponding nozzle 58 is controlled to open for precise steam humidification; for the upper area corresponding to the identified convex surface of the cardboard, the corresponding controllable nozzle 48 is controlled to output heated airflow for drying.

[0071] S4. Assisted leveling and exhaust gas treatment: While controlling temperature and humidity, the circulating exhaust system 6 continues to work to discharge moisture from the box and recover condensate; after being controlled, the cardboard, which tends to be flat, passes through the auxiliary flattening device 8 for final gentle rolling and shaping.

[0072] S5. Closed-loop optimization: The temperature and humidity sensor network feeds back the environmental data inside the box to the central control unit 7. Combined with the cardboard exit status, the control model parameters are adaptively fine-tuned to achieve continuous optimization of the production process.

[0073] By adopting the above technical solution, which organically combines high-precision detection, intelligent decision-making, asymmetric temperature and humidity control, flexible physical shaping, and closed-loop environmental management, the core of which lies in the closed-loop logic of "detection-analysis-targeted control-shaping-feedback optimization", it not only achieves rapid correction of warping but also enables preventive intervention in the production process through continuous optimization, significantly improving the stability of cardboard flatness and production efficiency, and solving the pain points of traditional methods such as lag, roughness, and uncontrollability.

[0074] The implementation principle of this application embodiment is as follows:

[0075] First, the corrugated cardboard is carried by the roller conveyor 1 and fed into the processing line at a uniform speed. Before entering the core control area, the warping detection unit 3 located upstream performs a high-speed non-contact scan on the surface of the cardboard to obtain the three-dimensional contour data of the cardboard cross section. The data is transmitted to the central control unit 7 in real time via cable to provide the entire system with accurate quantitative information on the warping shape, height and direction.

[0076] Secondly, after receiving the detection data, the central control unit 7 calls the built-in temperature and humidity coupling control model for analysis. The model combines parameters such as cardboard speed and raw paper characteristics to identify the concave and convex areas that cause warping. Based on this, the model calculates the differentiated control instructions for each zone on the upper and lower surfaces of the cardboard required to correct the warping, including the temperature / airflow setting of each controllable air nozzle 48 and the opening and closing duration of the corresponding solenoid valve of each steam nozzle 58.

[0077] Secondly, according to the control command, the upper functional unit 4 is started. The first fan 44 draws outside air into the air box 41 after filtering it through the filter screen 43. The air flows through the heating coil 45, which is precisely temperature controlled by the temperature controller 42, and is heated to clean hot air at the set temperature. The hot air is distributed to multiple zone air ducts 47 through the delivery pipe 46 and finally blown out from the array of controllable air nozzles 48. The outlet air temperature and air volume of each air nozzle or air nozzle group can be adjusted independently. Simultaneously, the lower functional unit 5 acts according to the command. The steam generator 52 uses water from the water tank 51 to generate saturated steam. After the pressure is stabilized by the pressure reducing valve 53 and the water is removed by the steam-water separator 55, dry steam is obtained. The dry steam is delivered to the steam collection box 57 through the heat preservation pipe 56 and finally sprayed upward from the array of slit nozzles 58. The independent solenoid valve in front of each nozzle or nozzle group is controlled to open and close.

[0078] Secondly, during the control process, the circulating exhaust system 6 continues to work. The second fan 63 actively draws the humid and hot air in the control box 2 into the connecting box 61 through the filter plate 62 and inputs it into the steam filter box 64. When the air flows through the multiple vertically installed condenser plates 65, which are alternately installed inside, the water vapor condenses into water. The condensate flows down the plate surface and is collected through the first collection pipe 67 and the second collection pipe 68, and finally flows back to the water tank 51. The dried air is discharged through the exhaust pipe 66.

[0079] Secondly, after temperature and humidity control, the cardboard, whose stress has been basically balanced, enters the auxiliary flattening device 8 area. The cylinder 82 drives the entire flattening assembly to descend to the set pressure, and the motor 87 drives the rotating drum 86 to rotate at a constant speed. As the transmission groove 88 gradually tilts from the middle to both sides, the multiple pressure rollers 89 connected to the groove generate lateral reciprocating motions with different phases while revolving. At the same time, the convex shaft 892 of each pressure roller rolls along the wavy contour of the fixed guide plate 899. Through the transmission of the push rod 893 and the spring 896, it is finally transformed into the regular up-and-down undulating motion of the pressure roller 898. In this way, multiple pressure rollers 898 can form a wave-like composite rolling on the surface of the cardboard. The spring 896 provides constant and flexible pressure, so that the pressure roller 898 can adapt to the micro-undulations of the cardboard. This dynamic and flexible flattening method can further eliminate micro-residual stress, achieve perfect shaping, and avoid damage or stress rebound that may be caused by traditional rigid pressure rollers 898. In this way, the anti-warping effect of corrugated cardboard is improved.

[0080] In summary, the environmental parameters are continuously monitored by a network of temperature and humidity sensors installed inside the control box 2 and fed back to the central control unit 7. The central control unit 7 compares the actual environmental data with the expected model and can also adaptively fine-tune and learn the parameters of the internal temperature and humidity coupling control model based on the final output state of the cardboard.

Claims

1. A corrugated cardboard anti-warping control device, comprising a roller conveyor (1), a control box (2), and a warping detection unit (3), wherein the control box (2) is installed inside the roller conveyor (1), and the warping detection unit (3) is installed outside the feed end of the control box (2), characterized in that, Also include installed in the upper end of the control box (2) upper side of the functional unit (4), installed in the lower end of the control box (2) lower side of the functional unit (5), installed in the control box (2) inside a side of the circulating exhaust system (6), set in the control box (2) outside of the central control unit (7) and installed in the control box (2) inside and adjacent to the discharge end of the auxiliary flattening device (8); The upper side of the functional unit (4) includes a wind box (41), which is provided on the top of the control box (2), and the lower left end of the wind box (41) is provided with a temperature controller (42), the air inlet end of the wind box (41) is locked with a filter screen (43), the inside of the wind box (41) is provided with a first fan (44), the bottom of the first fan (44) is provided with a heating coil (45), and the heating coil (45) is clamped in the lower part of the wind box (41), the bottom of the wind box (41) is connected with a conveying pipe (46), the bottom of the conveying pipe (46) is arranged with a partition air duct (47), and the bottom of the partition air duct (47) is arranged with a controllable air nozzle (48); The lower side of the functional unit (5) includes a water tank (51), which is installed in the lower end of the control box (2), and the top of the water tank (51) is provided with a steam generator (52), the steam generator (52) is connected with a pressure reducing valve (53) through a flange at the exhaust end, the exhaust end of the pressure reducing valve (53) is bolted with a gas conveying pipe (54), the upper end of the gas conveying pipe (54) is locked with a steam-water separator (55), the steam-water separator (55) is installed on the upper end of the steam generator (52) through a support, and the exhaust end of the steam-water separator (55) is connected with a heat preservation pipeline (56), the top of the heat preservation pipeline (56) is connected with a steam collecting tank (57), and the top of the steam collecting tank (57) is arranged with a nozzle (58).

2. The anti-warping control device for corrugated board according to claim 1, characterized in that, The circulating exhaust system (6) includes a connecting box (61), which is installed on one side of the inner wall of the control box (2), and the air inlet end of the connecting box (61) is locked with a filter plate (62), the second fan (63) is installed in the connecting box (61), the filter box (64) is fixed on the end of the connecting box (61) away from the inside of the control box (2), the filter box (64) is arranged with a condensing plate (65), the filter box (64) is provided with an exhaust pipe (66) away from the connecting box (61), and the bottom of the filter box (64) is connected with a first collecting pipe (67), the bottom of the first collecting pipe (67) is installed with a second collecting pipe (68) at equal intervals, and the bottom of the second collecting pipe (68) is connected with the water tank (51).

3. The anti-warping control device for corrugated board according to claim 1, characterized in that, The auxiliary flattening device (8) comprises a fixing frame (81) locked on one side of the inner wall of the control box (2), a gas cylinder (82) installed at the middle of the upper end of the fixing frame (81), a butt joint block (83) connected to the bottom of the gas cylinder (82), a connecting rod (84) inserted into the butt joint block (83), side plates (85) installed on the left and right sides of the connecting rod (84), the top of the side plates (85) on the left and right sides being slidably connected with the fixing frame (81), a rotating drum (86) rotatably installed between the side plates (85) on the left and right sides, a motor (87) connected to the left side of the rotating drum (86), a transmission groove (88) formed in the outer part of the rotating drum (86), and a pressure roller (89) connected to the inner end of the transmission groove (88), the upper end of the pressure roller (89) being inserted into a guide rod (810).

4. The anti-warping control device for corrugated board according to claim 3, characterized in that, The pressure roller (89) comprises a first connecting shell (891) connected with the transmission groove (88) through a shaft, a convex shaft (892) slidably inserted into one side of the first connecting shell (891), a push rod (893) inserted into the first connecting shell (891), the upper end of the push rod (893) being connected with the convex shaft (892), the bottom of the push rod (893) being inserted into a second connecting shell (894), a positioning rod (895) fixed in the second connecting shell (894) and connected with the bottom of the push rod (893), a spring (896) arranged on the outer part of the positioning rod (895), a pressure roller frame (897) fixed at the bottom of the second connecting shell (894), a pressure roller (898) rotatably installed in the pressure roller frame (897), and a guide plate (899) abutting against the outer side of the convex shaft (892) and locked with the side plates (85) on the left and right sides.

5. The anti-warping control device for corrugated board according to claim 1, wherein The warping detection unit (3) is a multi-line laser profile scanner, and the detection surface of the warping detection unit (3) faces the running plane of the corrugated paperboard of the drum conveyor (1).

6. The anti-warping control device for corrugated board according to claim 1, wherein The controllable tuyere (48) and the nozzle (58) are arranged along the width direction of the paperboard, and the nozzle (58) is in the shape of a slit nozzle.

7. The anti-warping control device for corrugated board according to claim 2, wherein The condensing plates (65) are alternately and vertically installed inside the steam filter box (64), and the number of the condensing plates (65) is not less than three.

8. The anti-warping control device for corrugated board according to claim 3, characterized in that, The transmission grooves (88) are gradually inclined from the middle to the left and right sides of the rotating drum (86), and the number of the transmission grooves (88) is consistent with the number of the pressure rollers (89).

9. The anti-warping control device for corrugated board according to claim 4, wherein The bottom of the guide plate (899) is provided with concave grooves at equal intervals, and adjacent concave grooves form a wave-shaped profile.

10. A method of preventing warping of corrugated board using a device according to any one of claims 1-9, characterized in that, The method comprises the following steps: S1, real-time detection: when the corrugated paperboard runs on the drum conveyor (1), the warping detection unit (3) performs non-contact scanning on the surface profile of the corrugated paperboard to obtain real-time warping shape, height and direction data; S2, analysis decision: the central control unit (7) receives the data of step S1 and analyzes, identifies the concave and convex areas of the warping, and calculates the control parameters for each partition of the upper functional unit (4) and the lower functional unit (5); S3, asymmetric control: according to the decision of step S2, the central control unit (7) synchronously drives the upper functional unit (4) and the lower functional unit (5): for the lower area corresponding to the identified concave surface of the paperboard, the corresponding nozzle (58) is controlled to open for precise steam humidification; for the upper area corresponding to the identified convex surface of the paperboard, the corresponding controllable air nozzle (48) is controlled to output heated air flow for drying; S4, auxiliary flattening and waste gas treatment: while the temperature and humidity are controlled, the circulating exhaust system (6) continuously works to exhaust the moisture in the box and recover the condensed water; the paperboard that tends to be flat after being controlled passes through the auxiliary flattening device (8) for the last gentle rolling and setting; S5, closed-loop optimization: the temperature and humidity sensor network feeds back the data of the environment in the box to the central control unit (7), and combines the state of the paperboard out of the box to adaptively fine-tune the control model parameters, so as to realize the continuous optimization of the production process.

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