A multi-layer laminating device for insulation paper
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- YILI TECH TONGSHAN CO LTD
- Filing Date
- 2026-02-09
- Publication Date
- 2026-06-05
Smart Images
Figure CN122143419A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of insulator production technology, specifically to a multilayer lamination device for insulating paper. Background Technology
[0002] Insulating paper, as a key insulating material in electrical equipment such as power transformers and motors, typically requires multi-layer lamination to enhance its mechanical strength and dielectric properties. During multi-layer lamination, the adhesive (usually water-based or solvent-based) is applied to the surface of the insulating paper and must undergo thorough drying to evaporate any moisture or organic solvents. Otherwise, residual solvents will severely affect the interlayer bonding quality and insulation performance. Because adhesives exhibit different rheological properties and curing behaviors at different temperatures, existing technologies typically employ a multi-stage heating strategy: first, preheating at a lower temperature to activate the adhesive molecules and give them appropriate fluidity; then, applying pressure with pressing rollers to achieve initial interlayer bonding; next, sending the paper to a high-temperature drying device to completely evaporate residual solvents and cure the adhesive layer; and finally, cooling for final shaping. This process effectively ensures lamination quality and is therefore widely used in the industry.
[0003] However, existing equipment typically treats preheating, drying, and cooling as three independent process units, each equipped with its own heating and cooling devices. This layout results in a lack of heat coordination between the heating units, preventing the waste heat generated during the preheating stage from being transferred and utilized in the drying stage. At the same time, the high-temperature exhaust gas discharged from the drying chamber is directly released into the environment, resulting in a large loss of sensible heat and high energy consumption. Summary of the Invention
[0004] The purpose of this invention is to address the problems in the prior art where the heat between heating units cannot be utilized in a coordinated manner and the energy consumption is high due to the loss of sensible heat from high-temperature exhaust gas. This invention proposes a multi-layer bonding device for insulating paper.
[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A multilayer bonding device for insulating paper includes a base and further includes: A pair of composite rollers are disposed on the base. When the pair of composite rollers rotate, they are used to press and bond multiple layers of insulating paper. A drying box, set on the base and located at the discharge end of the composite roller, is used to dry the pressed insulating paper; A cooling box, mounted on the base and located at the discharge end of the drying box, is used to cool and shape the dried insulating paper. An airflow circulation assembly, connected to the cooling box and the drying box, is used to transfer the cooling airflow from the cooling box to the drying box to form a heated airflow. The heated airflow sequentially preheats and dries the insulating paper at high temperature, thereby achieving segmented drying of the adhesive.
[0006] Based on the above technical solution, the present invention can be further improved as follows.
[0007] Furthermore, a frame is fixedly installed on the base, and the frame is provided with no less than two tension rollers, which are located upstream of the composite roller; A pair of composite rollers are mounted on a base, and a drive motor is fixedly installed on the base. The output end of the drive motor is fixedly connected to the center of one side of the composite roller. A gear is fixedly installed at the center of the other side of the composite roller. The gears on the pair of composite rollers mesh with each other to drive the pair of composite rollers to rotate.
[0008] Furthermore, the cooling box is also equipped with an airflow purging assembly that communicates with both the drying box and the cooling box. The airflow purging assembly includes: An air pump is fixedly installed on the cooling box, and its air outlet is connected to two air outlet pipes through a T-connector. The cover consists of two units, which are fixedly installed on the side walls of the drying chamber and the cooling chamber respectively, and are interconnected with the internal areas of the drying chamber and the cooling chamber. The air distribution plates are fixedly installed on the inside of the cover, and their number and distribution position are adapted to the cover. The heating wire is fixedly installed inside the cover located on the outside of the drying oven.
[0009] Furthermore, the airflow circulation assembly includes: Two air inlet covers are fixedly installed on the side walls of the drying chamber and the cooling chamber respectively, and are interconnected with the internal areas of the drying chamber and the cooling chamber. An air outlet hood is fixedly installed on the outer cover of the drying oven and is connected to the outer cover of the drying oven. The air outlet hood is also provided with an air outlet hole, through which the hot air flow inside the drying oven can flow out to the outside of the drying oven. There are two airflow pipes, one end of which is connected to the outer cover of the cooling box. One airflow pipe runs through the inside of the other cover, and the other airflow pipe runs through the inside of the air outlet cover. The low-temperature purging component is connected to the airflow pipe inside the air outlet hood. It is used to preheat the multi-layer insulating paper at low temperature to prevent the adhesive surface from forming a skin quickly. The high-temperature purging component is connected to the airflow pipe inside the enclosure, and it is used to deeply evaporate the solvent to enhance the activity of the adhesive.
[0010] Furthermore, the cryogenic purging component includes: The first serpentine heat exchange tube has one end connected to the airflow tube inside the air outlet shroud; The first purge tube has one end connected to the other end of the first serpentine heat exchange tube, and the other end of the first purge tube is connected to two first air distribution seats arranged vertically and horizontally through a three-way connector. Several first nozzles are divided into two groups and respectively set on two first air distribution seats, with the air outlet of the first nozzles facing the side of the insulation layer.
[0011] Furthermore, the high-temperature purging component includes: The second serpentine heat exchange tube has one end connected to the airflow tube inside the casing; The second purge tube has one end connected to the other end of the second serpentine heat exchange tube, and the other end of the second purge tube is connected to two second air distribution seats arranged vertically and horizontally through a tee connector. Several second nozzles are divided into two groups and respectively set on two second air distribution seats. The air outlet of the second nozzle faces the side of the insulation layer, and the second nozzle is located downstream of the first nozzle.
[0012] Furthermore, both the drying box and the cooling box are equipped with several winding rollers. The insulating paper passes through the winding rollers in the drying box in sequence for drying and then enters the cooling box. After passing through the winding rollers in the cooling box in sequence for cooling and shaping, it is output through the outlet of the cooling box.
[0013] Furthermore, it also includes an intelligent temperature control system that works in conjunction with the low-temperature purging component and the high-temperature purging component, the intelligent temperature control system comprising: The first temperature sensor group is located in the air outlet area of the first nozzle of the low-temperature purging component, and is used to detect the real-time temperature of the adhesive on the surface of the insulating paper in the preheating zone. ; The second temperature sensor group is located in the air outlet area of the second nozzle of the high-temperature purging component, and is used to detect the solvent evaporation temperature of the insulating paper in the drying zone. ; A composite roller temperature sensor, embedded in the surface of the composite roller, is used to detect the temperature of the insulating paper substrate entering the bonding area. ; The main controller is electrically connected to the heating wire, drive motor, and air pump, and executes a segmented temperature control strategy based on the detected temperature. Preheating control: Temperature of the first serpentine heat exchanger tube satisfy:
[0014] In the formula: This refers to the preheating coefficient; is the equivalent thickness of the insulating paper; is the gradient temperature rise.
[0015] Drying control: The temperature of the second serpentine heat exchanger tube meets the following requirements:
[0016] In the formula: Heat of solvent evaporation; The heat capacity of the airflow; This is the layer number coefficient; The number of floors.
[0017] Furthermore, the intelligent temperature control system also includes a fit quality feedback diagnostic unit: A peel strength detector is installed 200-300mm downstream of the outlet of the cooling box to detect the interlayer peel strength of the multilayer insulating paper in real time. ; A bubble defect scanner, located downstream of the cooling box outlet, is used to detect the bubble density between the laminated insulating paper layers. ; The diagnostic processing module, integrated into the main controller, diagnoses process abnormalities within the drying oven based on detection results: when ,in The critical value is used to calculate the activation deficiency index. ;
[0018] In the formula: This is the bubble influence coefficient; Diagnostic rules: when If the preheating is insufficient, it is determined that the preheating is inadequate. when And the average bubble diameter When the temperature reaches mmmm, it indicates that the solvent has not evaporated completely; Temperature field uniformity index for:
[0019] In the formula: The standard deviation of temperature; Average temperature; For flow coefficient, For flow deviation; when At that time, it was determined that the airflow distribution was uneven.
[0020] Furthermore, the main controller is configured with a closed-loop adaptive control algorithm based on fit quality feedback: The main controller is configured with a closed-loop adaptive control algorithm: Level 1 regulation: When At that time, temperature compensation amount for:
[0021] In the formula: This is the proportionality coefficient; The compensated temperature range is 58℃.
[0022] Secondary regulation: When Execute coordinated adjustments:
[0023] In the formula: This is the speed adjustment coefficient; This refers to the traffic linkage coefficient; Temperature-velocity coefficient; Temperature-flow coefficient; After adjustment The temperature range is 75–95℃.
[0024] Self-learning mechanism: Recording quality improvement :
[0025] When 3 consecutive batches Update parameters as needed:
[0026] in and This represents the average improvement across three batches.
[0027] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: This invention constructs a closed-loop heat utilization system within the bonding device by setting up an airflow circulation component. The airflow circulation component recovers the low-temperature airflow used to cool the insulating paper in the cooling box, and then guides this airflow to the drying box to exchange heat with the high-temperature environment inside the drying box. Through temperature gradient transfer, it obtains higher heat energy, thereby transforming into a heated airflow with preheating and drying capabilities. This design achieves an organic coupling between waste heat recovery in the cooling process and heat output in the drying process. This allows both the high-temperature exhaust gas that would otherwise be emitted into the environment and the low-temperature airflow generated during the cooling process to be incorporated into the recycling system. The heated airflow formed after heat exchange sequentially undertakes the two functions of preheating and high-temperature drying, eliminating the redundant configuration of independent heating units for the preheating and drying units in the prior art. The segmented drying requirements of the adhesive are completed through a single airflow circulation path. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the overall connection structure of the present invention; Figure 2 This is a schematic diagram of the connection structure of the airflow circulation component of the present invention; Figure 3 This is a schematic diagram of the connection structure between the drying oven and the airflow purging assembly of the present invention; Figure 4 This is a schematic diagram of the drying box and the winding roller structure of the present invention; Figure 5 This is a diagram showing the overall architecture of the intelligent temperature control system of the present invention. Figure 6 This is a block diagram of the fit quality feedback diagnostic unit of the present invention; Figure 7 This is a flowchart of the closed-loop adaptive control algorithm of the present invention.
[0029] In the diagram: 1. Base; 2. Composite roller; 3. Drying box; 4. Cooling box; 5. Airflow circulation assembly; 51. Air inlet hood; 52. Air outlet hood; 53. Airflow pipe; 54. Low-temperature purging component; 541. First serpentine heat exchange tube; 542. First purging pipe; 543. First air distribution seat; 544. First nozzle; 55. High-temperature purging component; 551. Second serpentine heat exchange tube; 552. Second purging pipe; 553. Second air distribution seat; 554. Second nozzle; 6. Frame; 7. Tensioning roller; 8. Drive motor; 9. Gear; 10. Airflow purging assembly; 101. Air pump; 102. Air outlet pipe; 103. Cover; 104. Air distribution plate; 105. Heating wire; 11. Winding roller. Detailed Implementation
[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0031] Combination Figures 1-7 As shown, a multilayer bonding device for insulating paper according to the present invention includes a base 1, and further includes: A pair of composite rollers 2 are set on the base 1. When the pair of composite rollers 2 rotate, they are used to press and bond multiple layers of insulating paper. The drying box 3 is set on the base 1 and located at the discharge end of the composite roller 2, and is used to dry the pressed insulating paper. Cooling box 4, set on base 1 and located at the discharge end of drying box 3, is used to cool and shape the dried insulating paper; The airflow circulation component 5 is connected to the cooling box 4 and the drying box 3. It is used to transfer the cooling airflow from the cooling box 4 to the drying box 3 to form a heated airflow. The heated airflow preheats and dries the insulating paper in stages, thereby achieving the segmented drying of the adhesive.
[0032] After being pressed together by the composite roller 2, the multi-layered insulating paper coated with adhesive enters the drying chamber 3 for drying. During the drying process, the high-temperature environment inside the drying chamber 3 continuously accumulates heat energy. Subsequently, the insulating paper enters the cooling chamber 4, where the cooling airflow absorbs the heat from the insulating paper and its temperature rises, becoming a heated airflow. The airflow circulation component 5 guides this heated airflow back to the drying chamber 3 for temperature exchange, utilizing the high-temperature environment of the drying chamber 3 to heat it, converting the waste heat that would otherwise be discharged into usable heated airflow. This heated airflow re-enters the drying chamber 3 to preheat and dry the insulating paper in sequence, achieving segmented drying of the adhesive. This cyclical process allows the waste heat from both the cooling and drying stages to be recovered and utilized, eliminating the energy waste of independent heating in the preheating and drying units in traditional technologies, and significantly reducing overall energy consumption.
[0033] In a preferred embodiment, the present invention may be further configured as follows: Figure 1 , Figure 2 As shown; a frame 6 is also fixedly installed on the base 1, and no less than two tension rollers 7 are provided on the frame 6. The tension rollers 7 are located upstream of the composite roller 2. A pair of composite rollers 2 are mounted on a base 1, and a drive motor 8 is also fixedly installed on the base 1. The output end of the drive motor 8 is fixedly connected to the shaft center of one side of one of the composite rollers 2, and a gear 9 is fixedly installed at the shaft center of the other side of the composite roller 2. The gears 9 on the pair of composite rollers 2 mesh with each other to drive the pair of composite rollers 2 to rotate. The tension roller 7 adjusts the tension of the multilayer insulating paper before it enters the pressing process, ensuring that the surface of the insulating paper is flat and the layers are aligned, providing a good initial state for subsequent bonding. The drive motor 8 drives one of the composite rollers 2 to rotate, and through the meshing transmission of the gears 9, drives the other composite roller 2 to rotate synchronously in the opposite direction, ensuring that the two composite rollers 2 apply a uniform and continuous pressing force to the multilayer insulating paper, achieving full contact and initial bonding of the interlayer adhesive, laying the foundation for the subsequent drying process.
[0034] In a preferred embodiment, the present invention may be further configured as follows: Figure 1 , Figure 2 As shown; the cooling box 4 is also equipped with an airflow purging assembly 10 that is interconnected with the drying box 3 and the cooling box 4. The airflow purging assembly 10 includes: An air pump 101 is fixedly installed on the cooling box 4, and its air outlet is connected to two air outlet pipes 102 through a three-way connector. The cover 103 consists of two covers, which are respectively fixedly installed on the side walls of the drying box 3 and the cooling box 4 and are interconnected with the internal areas of the drying box 3 and the cooling box 4. The air distribution plate 104 is fixedly installed on the inside of the cover 103, and its quantity and distribution position are adapted to the cover 103. The heating wire 105 is fixedly installed inside the cover 103 located outside the drying chamber 3. The airflow purging assembly 10 delivers airflow to two outlet pipes 102 via the air pump 101, directionally purging the drying chamber 3 and the cooling chamber 4 respectively. The airflow entering the drying chamber 3 is heated by the heating wire 105 inside the cover 103 and then evenly distributed by the air distribution plate 104 to form a stable hot airflow for drying the insulating paper. The airflow entering the cooling chamber 4 is evenly distributed by the air distribution plate 104 to cool the insulating paper. This assembly provides an independently controllable airflow supply for the drying and cooling processes, and together with the airflow circulation assembly 5, it constitutes a complete airflow heat management system.
[0035] In a preferred embodiment, the present invention may be further configured as follows: Figure 1 , Figure 2 As shown; the airflow circulation component 5 includes: Two air inlet covers 51 are fixedly installed on the side walls of the drying chamber 3 and the cooling chamber 4 respectively and are interconnected with the internal areas of the drying chamber 3 and the cooling chamber 4. The air outlet hood 52 is fixedly installed on the cover 103 on the outside of the drying oven 3. It is connected to the cover 103 on the outside of the drying oven 3. The air outlet hood 52 is also provided with an air outlet hole, through which the hot air flow inside the drying oven 3 can flow out to the outside of the drying oven 3. There are two airflow pipes 53, one end of which is connected to the cover 103 on the outside of the cooling box 4. One airflow pipe 53 extends into the inside of the other cover 103, and the other airflow pipe 53 extends into the inside of the air outlet cover 52. The low-temperature purging component 54 is connected to the airflow pipe 53 inside the air outlet hood 52. It is used to preheat the multilayer insulating paper at low temperature to prevent the adhesive surface from forming a skin quickly. The high-temperature purging component 55 is interconnected with the airflow pipe 53 inside the cover 103. It is used to deeply evaporate the solvent to enhance the adhesive activity. The airflow circulation component 5 recovers airflow from the drying chamber 3 and the cooling chamber 4 through the air inlet hood 51. The heated airflow in the cooling chamber 4 is transported to the cover 103 and the outlet hood 52 outside the drying chamber 3 via the airflow pipe 53. One airflow enters the outlet hood 52 and connects to the low-temperature purging component 54. The indirect heat exchange between the outlet hood 52 and the high-temperature environment inside the drying chamber 3 raises the temperature of the heated airflow, forming a low-temperature heated airflow suitable for preheating and preventing rapid skin formation on the adhesive surface. The other airflow enters the cover 103 and is further heated by the heating wire 105 and connected to the high-temperature purging component 55 to form a high-temperature heated airflow that deeply evaporates the solvent and enhances the adhesive activity. Some of the high-temperature exhaust gas inside the drying chamber 3 is discharged through the air outlet on the air outlet hood 52 to achieve pressure balance. It should be noted that the air inlet hood 51 is located between the air outlet hood 52 and the drying chamber 3. Therefore, the temperature inside the air outlet hood 52 is lower than the temperature inside the air inlet hood 51. Consequently, the temperature at the air outlet of the low-temperature purging component 54 connected to the air outlet hood 52 is lower than the temperature at the air outlet of the high-temperature purging component 55. In this way, the cooling waste heat and drying waste heat are fully utilized through the two-stage temperature gradient, and the temperature requirements for segmented drying are achieved.
[0036] In a preferred embodiment, the present invention may be further configured as follows: Figure 2 , Figure 3 As shown; the low-temperature purging component 54 includes: The first serpentine heat exchange tube 541 has one end connected to the airflow tube 53 inside the air outlet shroud 52. The first purge pipe 542 has one end connected to the other end of the first serpentine heat exchange pipe 541, and the other end of the first purge pipe 542 is connected to two first air distribution seats 543 arranged vertically and horizontally through a three-way connector. Several first nozzles 544 are evenly divided into two groups and respectively disposed on two first air distribution seats 543. The air outlet of the first nozzles 544 faces the insulating layer. In the low-temperature purging component 54, the hot airflow from the air outlet hood 52 first undergoes heat exchange through the first serpentine heat exchange tube 541. The serpentine structure increases the heat exchange area and prolongs the residence time of the airflow in the high-temperature environment, allowing the airflow temperature to gradually rise to a suitable preheating temperature range. The heated airflow is then transported through the first purging tube 542 to the two parallel first air distribution seats 543, and then blown onto the surface of the insulating paper with a uniform low-temperature airflow through the evenly distributed first nozzles 544. This low-temperature preheating process gradually activates the adhesive molecules and gives them appropriate fluidity, avoiding the rapid skinning phenomenon caused by direct high-temperature purging, ensuring that the solvent inside the adhesive can migrate smoothly to the outside, and creating favorable conditions for subsequent high-temperature drying.
[0037] In a preferred embodiment, the present invention may be further configured as follows: Figure 2 , Figure 3 As shown; the high-temperature purging component 55 includes: The second serpentine heat exchange tube 551 has one end connected to the airflow tube 53 inside the cover 103. The second purge pipe 552 has one end connected to the other end of the second serpentine heat exchange pipe 551, and the other end of the second purge pipe 552 is connected to two second air distribution seats 553 arranged vertically and horizontally through a three-way connector. Several second nozzles 554 are divided into two groups and respectively set on two second air distribution seats 553. The air outlet of the second nozzles 554 faces the side of the insulation layer. The second nozzles 554 are located downstream of the first nozzles 544. In the high-temperature purging component 55, the high-temperature airflow from the cover 103, after being heated by the heating wire 105, first passes through the second serpentine heat exchange tube 551 to further enhance heat exchange, so that the airflow temperature reaches the high-temperature range required for deep drying. The high-temperature airflow is transported through the second purging tube 552 to the two parallel second air distribution seats 553, and then blown onto the surface of the insulation paper with a uniform high-temperature airflow through the equally spaced second nozzles 554. Since the second nozzle 554 is located downstream of the first nozzle 544, the surface adhesive of the insulating paper has been initially activated after low-temperature preheating. At this time, the high-temperature airflow can penetrate deep into the adhesive layer, quickly evaporate the residual solvent and promote the full curing of the adhesive. This avoids incomplete curing due to insufficient preheating or surface carbonization defects due to excessive temperature, and achieves a smooth transition from preheating to high-temperature drying. It should also be noted that the airflow in the drying oven 3 is first blown to the surface of the second serpentine heat exchange tube 551, and heat exchange occurs through the second serpentine heat exchange tube 551, thereby removing most of the heat. Then the airflow is blown to the surface of the first serpentine heat exchange tube 541, and a small portion of the heat is exchanged with the first serpentine heat exchange tube 541. Therefore, the temperature at the outlet of the second nozzle 554 is higher than the temperature at the outlet of the first nozzle 544.
[0038] The multilayer insulating paper undergoes a three-stage gradient drying process within the drying oven 3: preheating, rapid solvent removal, and deep curing. This process is accomplished collaboratively by the first nozzle 544, the second nozzle 554, and the environment of the drying oven 3. The first nozzle 544 sprays a low-temperature airflow at a moderate speed onto the surface of the insulating paper, gradually activating the adhesive molecules and creating appropriate fluidity. The solvent evaporates slowly without forming a surface skin, ensuring a small temperature difference between the inside and outside of the adhesive. This establishes a good diffusion channel for solvent migration and avoids surface densification caused by direct high temperatures that hinders internal solvent diffusion. The second nozzle 554, located downstream of the first nozzle 544, sprays a high-temperature airflow at a high speed, forcibly sweeping the preheated insulating paper. Through forced convection, it rapidly evaporates the surface and shallow solvent layers, causing the solvent content to drop sharply from 20-30% to 58%. The high-speed airflow quickly carries away solvent vapor, maintaining a large concentration gradient, accelerating the mass transfer process, and bringing the adhesive into a preliminary curing state. The drying oven 3, acting as a spatial carrier, maintains a high-temperature environment. Through a serpentine trajectory constructed by the rollers 11, it extends the residence time of the insulating paper to 3 to 8 minutes, completing three key tasks under sustained high temperature: deep solvent depth >0.5mm slowly migrates outward along the diffusion channel and evaporates to a residual amount <1%; the adhesive fully cross-links and cures to form a stable three-dimensional network, improving bonding strength; and radiant heating and natural convection homogenize the temperature and release pressure stress. The core difference between the second nozzle 554 and the drying oven 3 lies in their approaches: the former employs a short-duration, high-intensity intervention strategy with a lower airflow temperature but extremely high wind speed, rapidly treating the surface layer to achieve significant solvent removal; the latter adopts a long-duration, gentle maintenance strategy with a higher ambient temperature but a milder airflow, continuously and deeply treating the entire layer to achieve full curing. Both form a gradient drying strategy—fast first, then slow; surface first, then interior—ensuring both production efficiency and bonding quality.
[0039] In a preferred embodiment, the present invention may be further configured as follows: Figure 4 As shown, both the drying chamber 3 and the cooling chamber 4 are equipped with several winding rollers 11. The insulating paper sequentially passes over these rollers 11 in the drying chamber 3 for drying before entering the cooling chamber 4. It then sequentially passes over these rollers 11 again for cooling and shaping before being output through the outlet of the cooling chamber 4. The insulating paper forms a serpentine trajectory within the drying chamber 3 and cooling chamber 4, extending its residence time in each process area and ensuring sufficient drying and cooling. This layout allows the insulating paper to obtain sufficient processing time within a limited equipment space, ensuring complete curing of the adhesive and sufficient cooling and shaping of the insulating paper. It also avoids increased floor space due to excessive equipment length and heat loss during long-distance airflow transmission, improving the equipment's compactness and thermal efficiency. The specific winding trajectory can be determined by… Figure 4 As shown, the insulating paper is wound in the direction indicated by the dashed arrow.
[0040] In a preferred embodiment, the present invention may be further configured as follows: Figure 5 As shown; it also includes an intelligent temperature control system that works in conjunction with the low-temperature purging component 54 and the high-temperature purging component 55. The intelligent temperature control system includes: The first temperature sensor group (not shown) is located in the air outlet area of the first nozzle 544 of the low-temperature purging component 54, and is used to detect the real-time temperature of the adhesive on the surface of the insulating paper in the preheating zone. ; The second temperature sensor group (not shown) is located in the air outlet area of the second nozzle 554 of the high-temperature purging component 55, and is used to detect the solvent evaporation temperature of the insulating paper in the drying zone. ; A composite roller temperature sensor (not shown) is embedded in the surface of composite roller 2 to detect the temperature of the insulating paper substrate entering the bonding area. ; The first temperature sensor group uses a non-contact infrared temperature sensor, which employs the principle of infrared radiation temperature measurement. The sensor is installed to the side or above the first nozzle 544 of the low-temperature purging component 54, with the probe aligned with the adhesive layer on the surface of the insulating paper. By receiving the infrared radiation energy emitted from the adhesive surface, the radiation intensity is converted into a temperature signal according to the Stefan-Boltzmann law. This method is suitable for a preheating temperature range of 42–58°C, does not interfere with the airflow purging process, has a fast response time, and can track the temperature distribution on the surface of the moving insulating paper in real time.
[0041] The second temperature sensor group uses thermocouple temperature sensors, which employ contact temperature measurement. The thermocouple probes are positioned within the air outlet channel of the second nozzle 554 of the high-temperature purging component 55 or approximately 2 mm away from the surface of the insulating paper. The temperature of the high-temperature airflow or the surface of the insulating paper is measured through the thermoelectric effect. To improve measurement accuracy, a multi-point arrangement can be used, and the temperature of the drying zone can be calculated by averaging the results.
[0042] The composite roller temperature sensor is a thin-film platinum resistance temperature sensor, which is embedded in a groove on the surface of the composite roller 2. The outer surface of the sensor is flush with the roller surface or covered with a wear-resistant protective layer to ensure direct or indirect contact with the insulating paper substrate. The substrate temperature is measured using the linear relationship between the resistance value of the platinum resistance and temperature. Since the composite roller 2 is rotating, the temperature signal is transmitted to the main controller 124 via a slip ring or wireless transmission module. The thin-film platinum resistance sensor features high measurement accuracy, good linearity, and excellent long-term stability, making it suitable for measuring substrate temperatures ranging from room temperature to 60°C. Furthermore, the thin-film structure does not affect the mechanical strength or surface finish of the composite roller 2.
[0043] The main controller 124 is electrically connected to the heating wire 105, the drive motor 8, and the air pump 101, and executes a segmented temperature control strategy based on the detected temperature. Preheating control: Temperature of the first serpentine heat exchanger tube 541 satisfy:
[0044] In the formula: This is the preheating coefficient, which is 0.85. This refers to the equivalent thickness of the insulating paper. The gradient temperature is 24℃.
[0045] Drying control: Temperature of the second serpentine heat exchanger tube 551 satisfy:
[0046] In the formula: The heat of solvent evaporation is 385 kJ / kg; The heat capacity of the airflow; This is the layer number coefficient, with a value of 0.12. To determine the number of layers, the intelligent temperature control system uses a first temperature sensor group to detect the adhesive temperature in the preheating zone of the air outlet area of the first nozzle 544, a second temperature sensor group to detect the solvent evaporation temperature in the drying zone of the air outlet area of the second nozzle 554, and a composite roller temperature sensor 2 to detect the substrate temperature. The main controller 124 executes a segmented temperature control strategy based on the collected temperature data: For preheating control, the main controller 124 adjusts the temperature based on the substrate temperature. Equivalent thickness of insulating paper Through formula Calculate the heat transfer temperature of the first serpentine heat exchanger tube 541. This formula reflects a linear positive correlation between thickness and temperature: as the number of insulating paper layers increases, the equivalent thickness... When the temperature increases, the preheating temperature The preheating coefficient is increased accordingly to ensure that heat can penetrate the multi-layer structure and fully activate the adhesive; Adjusting the penetration characteristics according to different adhesive types; gradient temperature rise Ensure the adhesive is activated but does not form a skin.
[0047] For drying control, the main controller 124 is at the preheating temperature. Based on this, and taking into account the heat of solvent evaporation airflow heat capacity and number of layers Through formula Calculate the heat transfer temperature of the second serpentine heat exchanger tube 551. This includes a layer number correction term. Dynamic compensation for the number of layers was implemented: when The time correction term is 1. With each additional layer, the temperature increases. This ensures that the solvent in the inner layer of the multi-layer structure can also evaporate fully. This segmented temperature control strategy solves the problem that traditional fixed temperatures cannot adapt to different working conditions, ensuring that the adhesive is fully cured while avoiding energy waste.
[0048] In a preferred embodiment, the present invention may be further configured as follows: Figure 6 As shown; the intelligent temperature control system also includes a fit quality feedback diagnostic unit: A peel strength detector (not shown in the figure) is installed 200-300 mm downstream of the discharge port of cooling box 4 to detect the interlayer peel strength of the multilayer insulating paper in real time. ; A bubble defect scanner (not shown) is installed downstream of the outlet of the cooling box 4 and uses ultrasonic detection technology to detect the bubble density between the laminated insulating paper layers. ; The diagnostic processing module, integrated into the main controller, diagnoses process abnormalities within the drying oven 3 based on the detection results: when ,in The critical value is 3.2 N / 15 mm, at which the activation deficiency index is calculated. ;
[0049] In the formula: The bubble influence coefficient has a value ranging from 0.008 to 0.012. Diagnostic rules: when If the preheating is insufficient, it is determined that the preheating is inadequate. when And the average bubble diameter When the temperature reaches mm, the solvent is considered to have not evaporated completely; Temperature field uniformity index for:
[0050] In the formula: The standard deviation of temperature; Average temperature; This is the flow coefficient, with a value between 0.025 and 0.035. For flow deviation; when When uneven airflow distribution is detected, the bonding quality feedback diagnostic unit uses a peel strength detector to detect the peel strength of the finished product downstream of the cooling box 4 outlet. Bubble density is detected using a bubble scanner. The diagnostic module is integrated into the main controller, enabling reverse diagnostics from quality results to process steps. When peel strength is detected Below the critical value At that time, the diagnostic module uses formulas Calculate the underactivation index The formula consists of two parts: the first term... The second item quantifies the degree of intensity defects. The influence of superimposed bubble defects, bubble influence coefficient This demonstrates the deteriorating effect of air bubbles on bond strength.
[0051] Based on index Achieving accurate diagnosis within a numerical range: when When the temperature of the first serpentine heat exchanger tube 541 is increased, it indicates that the adhesive activation is severely insufficient, indicating that the preheating of the low-temperature purging component 54 is inadequate; when the temperature of the first serpentine heat exchanger tube 541 is increased, it indicates that the adhesive activation is severely insufficient. And the average bubble diameter When the temperature reaches mm, it indicates that although the adhesive has been activated to a certain extent, the internal solvent has not been fully evaporated, forming large bubbles. It is determined that the solvent in the high-temperature purging component 55 has not been completely evaporated.
[0052] Meanwhile, the diagnostic module uses formulas Calculate the temperature field uniformity index The first item The ratio of the temperature standard deviation to the mean temperature reflects the degree of dispersion in the temperature distribution; the second term... Flow deviation The effects on temperature field uniformity are linearly superimposed, and the flow coefficient This reflects the sensitivity of airflow distribution to temperature uniformity. When If the airflow distribution is found to be uneven, the output of the air pump 101 and the opening of the air distribution plate 104 are adjusted.
[0053] In a preferred embodiment, the present invention may be further configured as follows: Figure 7 As shown; the main controller is configured with a closed-loop adaptive control algorithm based on fit quality feedback: The main controller is configured with a closed-loop adaptive control algorithm: Level 1 regulation: When At that time, temperature compensation amount for:
[0054] In the formula: This is the proportionality coefficient, and its value is 0.028; The compensated temperature range is 58℃.
[0055] Secondary regulation: When Execute coordinated adjustments:
[0056] In the formula: This is the speed adjustment coefficient, with a value of 0.45. This is the traffic linkage coefficient, with a value of 1.3. This is the temperature-velocity coefficient, with a value of 0.15. This is the temperature-flow coefficient, with a value of 0.45. After adjustment The temperature range is 75–95℃.
[0057] Self-learning mechanism: Recording quality improvement :
[0058] When 3 consecutive batches Update parameters as needed:
[0059] in and To achieve the average improvement across three batches, the closed-loop adaptive control algorithm configured in the main controller executes a three-level progressive control strategy based on the diagnostic results: Primary regulation targets mild activation deficiency. Perform temperature compensation: using the formula
[0060] Calculate the temperature compensation for the first serpentine heat exchanger tube 541. This formula employs a proportional control strategy: activation deficiency index... The larger the value, the greater the compensation; current preheating temperature The higher, the same The larger the compensation amount, the more it reflects the temperature reference effect; the proportionality coefficient Ensure that the compensated temperature is within the range of 4258℃, correcting minor deviations without over-adjusting.
[0061] Secondary control is used to address severe quality issues by implementing coordinated control of three parameters: temperature, velocity, and airflow. First, through the formula Calculate the speed adjustment of composite roller 2. A negative sign indicates a reduction in speed: when activation is insufficient or the temperature field is uneven, reducing the speed of composite roller 2 extends the residence time of the insulating paper, allowing the adhesive to receive more thorough preheating and drying; speed adjustment coefficient. Control the rate of deceleration. and The superposition reflects the synergistic effect of the two anomalies.
[0062] Then through the formula Calculate the flow adjustment of air pump 101. This formula establishes a linkage between velocity and flow rate: when the velocity decreases, the flow rate decreases accordingly to avoid excessive airflow purging; flow rate linkage coefficient. Adjusting the flow rate's response to velocity changes, with a reference flow rate. Provide a proportional benchmark.
[0063] Finally, the formula is used. Calculate the new temperature of the second serpentine heat exchanger tube 551. This formula achieves bidirectional temperature correction: the first term... Convert the speed adjustment amount into temperature correction, temperature-speed coefficient. This demonstrates the effect of speed variation on drying efficiency; the second item. Convert the flow adjustment to temperature correction, temperature-flow coefficient. This demonstrates the impact of flow rate on heat exchange. It ensures that the adjusted temperature remains within the range of 75~95℃, achieving synergistic optimization of speed, flow rate, and temperature.
[0064] The self-learning mechanism records the quality improvement rate of each batch of bonding. Quantitative control effect. When three consecutive batches When this occurs, it indicates that the current control strategy remains effective, and the system automatically updates the baseline values of the control parameters: through the formula...
[0065] Fine-tuning the preheating permeability coefficient And layer correction factor .in and The average improvement over three batches demonstrates the system's adaptive learning capability towards process parameters. This closed-loop mechanism realizes a complete control loop of "real-time detection → precise diagnosis → graded control → continuous optimization".
[0066] The specific working principle of the multilayer bonding device for insulating paper of the present invention is as follows: The multi-layer insulating paper coated with adhesive is first tensioned by tension rollers 7 on frame 6 to ensure that the surface of the insulating paper is flat and the layers are aligned; then it enters a pair of composite rollers 2 driven by drive motor 8, and synchronously rotates in opposite directions through the meshing transmission of gears 9, applying uniform and continuous pressure to the multi-layer insulating paper to complete the full contact and initial bonding of the interlayer adhesive. After the insulation paper is pressed, it enters the drying oven 3. At this time, the air pump 101 in the airflow blowing assembly 10 delivers the airflow through the air outlet pipe 102 to the cover 103 outside the drying oven 3. After the airflow is heated by the heating wire 105, it is evenly distributed through the air distribution plate 104 to form stable hot air. After drying, the insulating paper enters the cooling box 4. The air pump 101 supplies cooling airflow to the outer cover 103 of the cooling box 4 through another air outlet pipe 102. After being evenly distributed by the air distribution plate 104, the insulating paper is cooled and shaped. At this time, the cooling airflow absorbs the heat of the insulating paper and its temperature rises, becoming a hot airflow, which is then recycled by the airflow circulation component 5. The airflow circulation assembly 5 recovers the hot airflow from the cooling box 4 through the air inlet hood 51. The airflow is transported to the outside of the drying box 3 through the airflow pipe 53 and is divided into two paths: one path enters the air outlet hood 52 and is connected to the low temperature purging component 54. By utilizing the indirect heat exchange between the air outlet hood 52 and the high temperature environment inside the drying box 3, the hot airflow is heated to a suitable preheating temperature range through the first serpentine heat exchange pipe 541. Then, it is blown onto the surface of the insulating paper with a uniform low temperature airflow of 42-58°C through the first purging pipe 542, the first uniform air distribution seat 543 and the first nozzle 544, so that the adhesive molecules are gradually activated and obtain appropriate fluidity, preventing the surface from forming a skin quickly. Another path enters the enclosure 103, where it is further heated by the heating wire 105 and connected to the high-temperature blowing component 55. The high-temperature airflow is enhanced by heat exchange through the second serpentine heat exchange tube 551, reaching the high-temperature range of 75-95°C required for deep drying. It is then blown onto the preheated surface of the insulating paper through the second blowing tube 552, the second uniform air seat 553, and the second nozzle 554, penetrating deep into the adhesive layer to rapidly evaporate residual solvent and promote full curing of the adhesive. Some of the high-temperature exhaust gas in the drying chamber 3 is discharged through the air outlet on the exhaust hood 52 to achieve pressure balance. Meanwhile, the insulating paper passes around several winding rollers 11 in sequence in the drying chamber 3, forming a serpentine running trajectory, extending the residence time to ensure thorough drying. The intelligent temperature control system collects real-time data on the adhesive temperature in the preheating zone, the solvent evaporation temperature in the drying zone, and the substrate temperature through a first temperature sensor group, a second temperature sensor group, and a composite roller temperature sensor. The main controller 124 executes a segmented temperature control strategy based on the detected temperatures: for the low-temperature purging component 54, the heat exchange temperature of the first serpentine heat exchange tube 541 is calculated using an exponential function relationship based on the equivalent thickness of the insulating paper layers and the substrate temperature, ensuring that the preheating temperature activates the adhesive without causing surface skinning; for the high-temperature purging component 55, a nonlinear coupling relationship is established based on the latent heat of evaporation of the adhesive solvent, the rotation speed of the composite roller 2, and the number of insulating paper layers to dynamically adjust the heat exchange temperature of the second serpentine heat exchange tube 551. The bonding quality feedback diagnostic unit monitors the interlayer peel strength, bubble density, and bubble diameter distribution of the final bonded product in real-time using a peel strength detector and a bubble defect scanner. The diagnostic processing module calculates the adhesive activation insufficiency index and the temperature field uniformity index based on the detection results, and reverse-diagnoses the process problems within the drying oven 3, determining whether the low-temperature purging component 54 is underheated or the solvent in the high-temperature purging component 55 is not completely evaporated. The closed-loop adaptive control algorithm executes a hierarchical control strategy based on the diagnostic results: the first-level fine control calculates the temperature compensation of the first serpentine heat exchange tube 541 through the proportional-integral control algorithm to achieve precise temperature control; the second-level linkage control synchronously adjusts the speed of the composite roller 2, the flow rate of the air pump 101, and the temperature of the second serpentine heat exchange tube 551. Through the innovative speed response weight, speed-flow coupling coefficient, speed-temperature conversion coefficient, and flow-temperature difference coupling coefficient, a nonlinear coupling relationship of three parameters is established to ensure that the adjustment process is smooth and does not over-adjust. The self-learning optimization mechanism records the bonding quality improvement rate for each batch. When the improvement rate exceeds 88% for three consecutive batches, the baseline values of the preheating penetration coefficient and the layer correction coefficient are automatically updated, enabling the system to continuously optimize. This cyclical process allows the waste heat from both the cooling and drying stages to be recovered and reused, eliminating the energy waste caused by the independent heating of the preheating and drying units in traditional technologies. A single airflow circulation path completes the segmented drying requirements of the adhesive, realizing a complete control loop of "quality detection → problem diagnosis → parameter adjustment → feedback optimization." This significantly reduces overall energy consumption and improves the stability of bonding quality and the intelligence level of the equipment.
[0067] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A multilayer bonding device for insulating paper, comprising a base (1), characterized in that, Also includes: A pair of composite rollers (2) are disposed on the base (1). When the pair of composite rollers (2) rotate, they are used to press and bond multiple layers of insulating paper. The drying box (3) is set on the base (1) and located at the discharge end of the composite roller (2) for drying the pressed insulating paper; Cooling box (4), set on the base (1) and located at the discharge end of the drying box (3), is used to cool and shape the insulating paper after drying. The airflow circulation component (5) is connected to the cooling box (4) and the drying box (3) to form a heating airflow after the cooling airflow from the cooling box (4) is exchanged for temperature in the drying box (3). The heating airflow preheats and dries the insulating paper in sequence to achieve segmented drying of the adhesive.
2. The multilayer lamination device for insulating paper according to claim 1, characterized in that, A frame (6) is also fixedly installed on the base (1), and no less than two tension rollers (7) are provided on the frame (6). The tension rollers (7) are located upstream of the composite roller (2). A pair of composite rollers (2) are both mounted on a base (1). A drive motor (8) is also fixedly mounted on the base (1). The output end of the drive motor (8) is fixedly connected to the center of one side of the composite roller (2). A gear (9) is fixedly mounted at the center of the other side of the composite roller (2). The gears (9) on the pair of composite rollers (2) mesh with each other to drive the pair of composite rollers (2) to rotate.
3. The multilayer lamination device for insulating paper according to claim 2, characterized in that, The cooling box (4) is also provided with an airflow purging assembly (10) that is interconnected with the drying box (3) and the cooling box (4). The airflow purging assembly (10) includes: An air pump (101) is fixedly installed on a cooling box (4), and its outlet end is connected to two air outlet pipes (102) through a three-way connector. The number of covers (103) is two, which are fixedly installed on the side walls of the drying box (3) and the cooling box (4) respectively and are interconnected with the internal areas of the drying box (3) and the cooling box (4); The air distribution plate (104) is fixedly installed on the inside of the cover (103), and its quantity and distribution position are adapted to the cover (103); The heating wire (105) is fixedly installed inside the cover (103) located outside the drying oven (3).
4. The multilayer lamination device for insulating paper according to claim 3, characterized in that, The airflow circulation component (5) includes: Two air inlet covers (51) are fixedly installed on the side walls of the drying box (3) and the cooling box (4) respectively and are connected to the internal areas of the drying box (3) and the cooling box (4); An air hood (52) is fixedly installed on the cover (103) outside the drying box (3). It is connected to the cover (103) outside the drying box (3). An air outlet is also provided on the air hood (52). The hot air flow inside the drying box (3) can flow out to the outside of the drying box (3) through the air outlet. There are two airflow pipes (53), one end of which is connected to the cover (103) outside the cooling box (4). One airflow pipe (53) penetrates into the interior of the other cover (103), and the other airflow pipe (53) penetrates into the interior of the air outlet cover (52). The low-temperature purging component (54) is connected to the airflow pipe (53) inside the air outlet hood (52), and is used to preheat the multilayer insulating paper at low temperature to prevent the adhesive surface from forming a skin quickly. The high-temperature purging component (55) is connected to the airflow pipe (53) inside the cover (103), and is used to deeply evaporate the solvent to enhance the activity of the adhesive.
5. The multilayer laminating device for insulating paper according to claim 4, characterized in that, The cryogenic purging component (54) includes: The first serpentine heat exchange tube (541) has one end connected to the airflow tube (53) inside the air outlet shroud (52); The first purge pipe (542) has one end connected to the other end of the first serpentine heat exchange pipe (541), and the other end of the first purge pipe (542) is connected to two first air distribution seats (543) arranged vertically and horizontally through a three-way connector. Several first nozzles (544) are divided into two groups and respectively set on two first air distribution seats (543), with the air outlet of the first nozzles (544) facing the side of the insulating layer.
6. The multilayer lamination device for insulating paper according to claim 5, characterized in that, The high-temperature purging component (55) includes: The second serpentine heat exchange tube (551) has one end connected to the airflow tube (53) inside the cover (103); The second purge pipe (552) has one end connected to the other end of the second serpentine heat exchange pipe (551), and the other end of the second purge pipe (552) is connected to two second air distribution seats (553) arranged vertically and horizontally through a three-way connector. Several second nozzles (554) are divided into two groups and respectively set on two second air distribution seats (553). The air outlet of the second nozzle (554) faces the side of the insulating layer. The second nozzle (554) is located downstream of the first nozzle (544).
7. The multilayer laminating device for insulating paper according to claim 1, characterized in that, Both the drying box (3) and the cooling box (4) are equipped with several winding rollers (11). The insulating paper passes through the winding rollers (11) in the drying box (3) in sequence for drying and then enters the cooling box (4). After passing through the winding rollers (11) in the cooling box (4) in sequence for cooling and shaping, it is output through the outlet of the cooling box (4).
8. The multilayer laminating device for insulating paper according to claim 6, characterized in that, It also includes an intelligent temperature control system that works in conjunction with the low-temperature purging component (54) and the high-temperature purging component (55), the intelligent temperature control system comprising: The first temperature sensor group is located in the air outlet area of the first nozzle (544) of the low-temperature purging component (54) and is used to detect the real-time temperature of the adhesive on the surface of the insulating paper in the preheating zone. ; The second temperature sensor group is located in the air outlet area of the second nozzle (554) of the high-temperature purging component (55) and is used to detect the solvent evaporation temperature of the insulating paper in the drying zone. ; A composite roller temperature sensor is embedded in the surface of the composite roller (2) to detect the temperature of the insulating paper substrate entering the bonding area. ; The main controller (124) is electrically connected to the heating wire (105), the drive motor (8), and the air pump (101), and executes a segmented temperature control strategy based on the detected temperature: Preheating control: Temperature of the first serpentine heat exchanger tube (541) satisfy: ； In the formula: This refers to the preheating coefficient; This refers to the equivalent thickness of the insulating paper. For gradient temperature rise; Drying control: Temperature of the second serpentine heat exchanger tube (551) satisfy: ； In the formula: Heat of solvent evaporation; The heat capacity of the airflow; This is the layer number coefficient; The number of floors.
9. A multilayer laminating device for insulating paper according to claim 8, characterized in that, The intelligent temperature control system also includes a fit quality feedback diagnostic unit: A peel strength detector is installed 200-300 mm downstream of the outlet of the cooling box (4) to detect the interlayer peel strength of the multilayer insulating paper in real time. ; A bubble defect scanner is installed downstream of the outlet of the cooling box (4) to detect the bubble density between the insulating paper layers after lamination. ; The diagnostic processing module, integrated within the main controller, diagnoses process abnormalities within the drying oven (3) based on the detection results: when ,in The critical value is used to calculate the activation deficiency index. ; ； In the formula: This is the bubble influence coefficient; Diagnostic rules: when If the preheating is insufficient, it is determined that the preheating is inadequate. when And the average bubble diameter When the temperature reaches mm, the solvent is considered to have not evaporated completely; Temperature field uniformity index for: ； In the formula: This represents the standard deviation of temperature. Average temperature; For flow coefficient, For flow deviation; when At that time, it was determined that the airflow distribution was uneven.
10. A multilayer laminating device for insulating paper according to claim 9, characterized in that, The main controller is equipped with a closed-loop adaptive control algorithm based on fit quality feedback: The main controller is configured with a closed-loop adaptive control algorithm: Level 1 regulation: When At that time, temperature compensation amount for: ； In the formula: This is the proportionality coefficient; The compensated temperature range is 58℃; Secondary regulation: When Execute coordinated adjustments: ； In the formula: This is the speed adjustment coefficient; This refers to the traffic linkage coefficient; Temperature-velocity coefficient; Temperature-flow coefficient; After adjustment The temperature range is 75–95℃; Self-learning mechanism: Recording quality improvement : ； When 3 consecutive batches Update parameters as needed: in and This represents the average improvement across three batches.