Film covering equipment

Abstract

The invention discloses film laminating equipment, which comprises an unwinding mechanism, a film laminating mechanism, a film laminating mechanism and a film laminating mechanism, the gluing mechanism is used for uniformly coating glue on the surface of the spread iron plate of the iron roll in a roller coating or spray coating or blade coating mode; the heating box is arranged at an outlet of the gluing mechanism, and the iron plate directly enters the heating box after being glued; and the film covering mechanism is arranged at the outlet end of the heating box and is provided with an unwinding group, a film tearing group, a buffer roller group, a preheating pressing group, a cooling group and a winding group. The film laminating mechanism is tightly arranged at the outlet end of the heating box, rapid bearing of the iron plate is achieved through the buffer roller set, the iron plate conveying distance is greatly shortened, the iron plate enters the film laminating mechanism, the viscosity of an adhesive layer on the iron plate is activated through waste heat, power consumption of a preheating pressing set of the film laminating machine is reduced, and the preheating time is shortened; the gluing force of the iron plate and the colored film is improved, the production cost is greatly reduced, and efficient and energy-saving production is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of laminating on metal plates, in particular to a laminating device. Background Art

[0002] In the metal sheet laminating industry, traditional equipment coats the sheet metal with glue, cures it at high temperatures, and then reels it. The heating box and laminating machine operate independently, resulting in the storage and transportation of the sheet metal in rolls. An unwinding device then gradually unwinds the rolls, providing a continuous and stable supply of sheet metal to the laminating machine. The laminating machine's preheating and pressing unit consumes significant energy to reheat the sheet metal to the appropriate temperature, resulting in high energy consumption and increased production costs.

[0003] The high-temperature curing stage after gluing the iron sheet also presents numerous drawbacks. For example, during the transmission process, the single-end drive method struggles to cope with the increased viscosity of the iron sheet after gluing, which can easily cause the iron sheet to stretch, deform, loosen, accumulate, or even be interrupted. An unreasonable support structure causes the iron sheet to fall during long-distance transmission, resulting in uneven glue flow and poor curing quality. During the temperature-raising and curing stage, traditional ovens often use a single heating method, resulting in uneven temperature distribution and an inability to meet the segmented heating requirements of different glues, leading to incomplete glue curing or local overheating and burning. Furthermore, the lack of an effective hot air circulation and ventilation exhaust system not only reduces heat transfer efficiency but also causes the accumulation of harmful gases and vapors generated during the glue curing process, affecting the glue's performance and the health of operators. Summary of the Invention

[0004] The purpose of the present invention is to provide a laminating device to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows: The present invention provides a laminating device, comprising: Unwinding mechanism, used to unwind the iron coil; A gluing mechanism, used for evenly coating the glue on the surface of the iron plate unrolled from the iron coil by roller coating, spraying or scraping; A heating box is provided at the outlet of the gluing mechanism, and the iron plate directly enters the heating box after being glued; The laminating mechanism is arranged at the outlet end of the heating box, and comprises a unwinding group, a film tearing group, a buffer roller group, a preheating and pressing group, a cooling group, and a winding group. The unwinding group is connected to the film tearing group, and is used to peel off the base film of the pre-prepared colored film. The buffer roller group is arranged between the preheating and pressing group and the outlet end of the heating box, and is used to adjust the movement of the iron plate so that the iron plate with residual temperature directly enters the preheating and pressing group. The preheating and pressing group preheats and presses the iron plate and the colored film after the base film is peeled off. The cooling group is located on one side of the preheating and pressing group, cools the pressed colored plate and rewinds it through the winding group.

[0006] Specifically, a colored film is placed on the unwinding group, outputted through the unwinding group, and enters the film tearing group through several transition rollers. The surface of the transition roller is coated with a silicone layer to ensure that the film material is transmitted smoothly and without scratches; the film tearing group has a film tearing knife assembly, and the angle between the film tearing knife assembly and the base film traction roller group is 30-45 degrees, and the base film peeling tension is controlled by a servo motor; the buffer roller group is composed of several guide rollers, which are arranged in a stepped manner. A magnetic powder brake is set at both ends of each guide roller. The real-time data of the tension sensor is received through the PLC system, and the braking torque of each guide roller is dynamically adjusted to prevent deviation or wrinkles caused by tension fluctuations; the cooling group adopts an air-cooling-water-cooling composite method to cool the laminated sheet to below 40°C to avoid internal stress concentration caused by too rapid cooling; the winding group is driven by a torque motor, and the winding tension is automatically adjusted according to the thickness of the sheet, and the winding speed is linked to the overall operating speed of the laminating machine.

[0007] In this technical solution, the laminating mechanism is tightly arranged at the outlet end of the heating box, and the buffer roller group is used to realize the rapid reception of the iron plate, which greatly shortens the transmission distance of the iron plate, so that the iron plate enters the laminating mechanism and uses the residual heat to activate the viscosity of the glue layer on the iron plate, reducing the power consumption of the preheating and pressing group of the laminating machine, shortening the preheating time, and improving the bonding strength between the iron plate and the colored film, thereby greatly reducing production costs and achieving efficient and energy-saving production.

[0008] As an extension of the above solution, the heating box has: A box body, wherein the inlet and outlet of the box body are respectively provided with active rollers driven by a variable frequency motor, and a plurality of rollers are provided in the box body; the box body adopts a segmented heating setting, which is divided into a low-temperature zone in the front section, a high-temperature zone in the middle section, and a heat preservation zone in the rear section, and low-temperature heating elements, high-temperature heating elements, and heat preservation heating elements are respectively provided corresponding to the low-temperature zone, the high-temperature zone, and the heat preservation zone, and the low-temperature heating element, the high-temperature heating element, and the heat preservation heating element are respectively provided with an upper part and a lower part, and the upper part and the lower part of the heating element are correspondingly erected above and below the walking path of the iron plate; A hot air circulation device comprises a hot air input pipe, a hot air output pipe, and several groups of centrifugal fans. The centrifugal fans are arranged in the middle of the top of the box and distributed along the direction of the iron plate. One side of the centrifugal fans is connected to the hot air input pipe and the other side blows into the box. The hot air output pipe is arranged at the bottom of the box. The ventilation and exhaust device comprises a plurality of exhaust ducts arranged on the top or side of the box body.

[0009] In this extended solution, by dividing the box into a low-temperature zone, a high-temperature zone, and an insulation zone, precise segmented temperature control of the glue curing process is achieved. Compared with the traditional single heating method, the degree of glue curing is effectively improved, effectively avoiding local overheating and burning or incomplete curing problems. At the same time, the heating elements are symmetrically distributed up and down, and combined with the hot air circulation device, the temperature deviation of each temperature zone in the box is small, ensuring that the glue on the surface of the iron plate is heated evenly. The ventilation and exhaust device promptly discharges harmful gases such as organic solvent vapor and reaction exhaust gas generated during the glue curing process, maintains the clean air in the box, avoids the negative impact of harmful gas accumulation on the performance of the glue, and ensures the health and safety of operators.

[0010] As an extension of the above solution, the low-temperature heating element is a ceramic heating tube, the high-temperature heating element is a high-temperature resistance wire heating assembly, and the heat-insulating heating element is an infrared heating plate. This combination of three heating elements allows for compatibility with a variety of mainstream industrial adhesives, including one-component polyurethane, two-component epoxy, and polyimide adhesives. This improves the versatility of the device and effectively addresses the issue of limited glue compatibility.

[0011] As an extension of the above solution: guide plates are provided in the box corresponding to the low temperature zone, the high temperature zone and the heat preservation zone, and the guide plates include an inclined side plate and a rotating arc plate provided on the inner side of the box; One side end of the inclined side plate is connected to the top of the box body, and the other side end is connected to the inner side surface of the box body, and is arranged in an inclined manner; The rotary arc plate is set below the iron plate walking path, and one side end is smoothly connected to the inner side of the box body, the middle section is an arc structure, and the other side end extends along the tangent direction of the arc end and points to the bottom side of the iron plate.

[0012] In this extended scheme, the centrifugal fan drives the hot air circulation, and cooperates with the inclined side plates and the rotating arc plates to guide the heat flow. The hot air first flows from the top of the box to the upper surface of the iron plate, flows in the horizontal plane at the upper surface of the iron plate, and flows to the gap between the iron plate and the box at the edge of the iron plate. Then, it is guided by the rotating arc plate and the inner side surface of the box in a smooth transition, enters the middle arc structure, and uses the arc surface of the arc structure to change direction. Finally, it flows toward the bottom side of the iron plate along the tangential direction of the arc end. Part of the hot air flows again along the bottom side of the iron plate to improve the heating uniformity of the iron plate. Part of the hot air enters the box through the hot air output pipe, the hot air heating unit, the hot air input pipe, and the centrifugal fan to form a circulation, ensuring that the glue is evenly cured on the surface of the iron plate.

[0013] As an extension of the above solution, the rollers are positioned perpendicular to the direction of travel of the iron sheet, and a support structure is provided below the rollers. The support structure comprises a base, a support column, an electric push rod mounted within the support column, and a support beam mounted at the end of the electric push rod. The rollers are mounted on the support beam. This extension solution, through the combination of the electric push rod and the support beam, allows the rollers to be adjusted in height, effectively preventing the problem of glue flow concentration caused by the iron sheet falling.

[0014] As an extension of the above solution, an upper connecting plate and a lower connecting plate are provided between the support beam and the electric push rod. The lower connecting plate is fixedly connected to the end of the electric push rod, and the upper connecting plate is fixedly connected to the support beam. A compression spring is provided between the upper and lower connecting plates. The compression spring effectively buffers vibrations generated during the transmission of the iron plate and provides adaptive support based on the deadweight of the iron plate.

[0015] As an extension of the above solution: a cleaning mechanism is provided between the unwinding mechanism and the gluing mechanism, and the cleaning mechanism includes a pre-spraying area, a main cleaning area and a rinsing area; The pre-spraying area is provided with a low-pressure water nozzle, which uses low-pressure water to preliminarily rinse the surface of the iron plate to wash away larger particles of impurities; The main cleaning area includes a high-pressure spray head and a brush roller. The high-pressure spray head is located above the iron plate travel path. The brush roller is set on the upper side and the lower side of the iron plate travel path. The cleaning liquid containing metal detergent is sprayed on the iron plate at high pressure through the high-pressure spray head and brushed by the brush roller. The rinsing area is provided with a clean water nozzle to rinse away the residual cleaning agent with clean water.

[0016] In this extended solution, the cleaning mechanism can efficiently remove impurities on the surface of the iron plate through a three-stage cleaning process consisting of the pre-spraying area, the main cleaning area, and the rinsing area. The clean iron plate surface provides a good adhesion basis for the glue.

[0017] As an extension of the above solution, a leveling and straightening mechanism is provided between the cleaning mechanism and the gluing mechanism. The leveling and straightening mechanism includes a leveling and straightening device with multiple sets of rollers. The leveling and straightening device compresses and stretches the iron plate, correcting any bending and wavy defects on the iron plate and flattening it. The flat iron plate surface facilitates even application of glue by the gluing mechanism, preventing glue accumulation or missed applications due to unevenness of the iron plate.

[0018] As an extension of the above solution, the leveling and straightening mechanism also includes a passivation tank located on one side of the multiple roller sets. After leveling and straightening, the iron plate enters the passivation tank for passivation treatment, forming a dense passivation film on the iron plate's surface. Immediately after leveling and straightening, the iron plate enters the passivation tank for treatment, forming a dense passivation film approximately 0.5-1μm thick on its surface. This passivation film effectively isolates the iron plate from direct contact with the external environment, improving its corrosion resistance.

[0019] As an extension of the above solution, the leveling and straightening mechanism also includes an infrared heating drying oven, located on one side of the passivation tank. After passivation, the iron plate enters the infrared heating drying oven, where it dries out moisture from the plate's surface. This infrared heating drying oven quickly and efficiently removes moisture from the iron plate's surface, leaving it dry. This eliminates the risk of rust caused by residual moisture, further enhances the corrosion resistance developed by the passivation treatment, and extends the iron plate's storage and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 is a schematic structural diagram of a laminating device according to an embodiment; Figure 2 It is a partial structural schematic diagram of the heating box in the embodiment in the direction of iron plate travel.

[0021] In the figure: 100: unwinding mechanism, 200: gluing mechanism, 300: heating box, 310: box body, 311: low temperature zone, 312: high temperature zone, 313: insulation zone, 320: driving roller, 330: roller, 331: base, 332: support column, 333: electric push rod, 334: support beam, 335: compression spring, 340: hot air circulation device, 341: centrifugal fan, 342: hot air output duct , 350: Ventilation and exhaust device, 360: Guide plate, 361: Oblique side plate, 362: Rotary arc plate, 400: Laminating mechanism, 410: Unwinding group, 420: Film tearing group, 430: Buffer roller group, 440: Preheating and pressing group, 450: Cooling group, 460: Winding group, 500: Cleaning mechanism, 600: Leveling and straightening mechanism, 610: Leveling and straightening device, 620: Passivation tank, 630: Infrared heating drying oven. DETAILED DESCRIPTION

[0022] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0024] In the description of the present invention, if there are words such as "several", it means one or more, and "more" means more than two. Greater than, less than, and exceed are understood as not including the number itself, and above, below, and within are understood as including the number itself.

[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0026] Several embodiments of the film coating device of the present invention are given below.

[0027] like Figure 1 As shown, in some embodiments, the present invention provides a film coating device, comprising: The unwinding mechanism 100 is used to unwind the iron coil; The gluing mechanism 200 is used to evenly apply glue to the surface of the iron plate unrolled from the iron coil by roller coating, spraying or scraping; A heating box 300 is provided at the outlet of the gluing mechanism 200, and the iron plate directly enters the heating box 300 after being glued; The laminating mechanism 400 is provided at the outlet end of the heating box 300 and comprises an unwinding group 410, a film tearing group 420, a buffer roller group 430, a preheating and pressing group 440, a cooling group 450, and a winding group 460; The unwinding group 410 is connected to the film tearing group 420 and is used to peel off the base film of the pre-prepared colored film. Specifically, the colored film is placed on the unwinding group 410, outputted by the unwinding group 410, and enters the film tearing group 420 through three transition rollers (diameter 150mm). The surface of the transition roller is coated with a silicone layer to ensure smooth and scratch-free transmission of the film material. The film tearing group 420 has a film tearing knife assembly. The angle between the film tearing knife assembly and the base film pulling roller assembly is 30-45 degrees. The base film peeling tension is precisely controlled by a servo motor at 80-120N. The tension value is monitored and fed back in real time by a tension sensor installed in front of the film tearing knife. The buffer roller group 430 is disposed between the preheating and pressing group 440 and the outlet end of the heating box 300 and is used to regulate the movement of the iron plate so that the iron plate with residual heat enters the preheating and pressing group directly. Specifically, the buffer roller group is composed of 3-5 guide rollers arranged in a stepped manner, with a spacing of 200-300 mm between adjacent rollers to ensure a smooth transition of the iron plate and uniform tension. In some preferred embodiments, magnetic powder brakes are installed at both ends of each guide roller. The PLC system receives real-time data from a tension sensor (range 0-500N, accuracy ±1N) and dynamically adjusts the braking torque of each guide roller to stabilize the iron plate tension within the range of 150-250N, thereby preventing deviation or wrinkling caused by tension fluctuations. The preheating and pressing group 440 preheats and presses the iron plate and the colored film after the release base film, the cooling group 450 is located below one side of the preheating and pressing group 440 (in actual production application, the preheating and pressing group can be arranged on the second floor of the factory building, and the cooling group is arranged on the first floor of the factory building and aligned below one side of the preheating and pressing group, so that the space of the floor height can be used for cooling and heat dissipation), the cooled colored plate is wound by the winding group 460; specifically, the cooling group adopts a combined air cooling and water cooling mode, the air cooling section has a wind speed of 5-8 m / s, the water cooling section has a cooling water temperature of 15-25℃, the cooling water flow is adjusted by a temperature control valve, so that the pressed plate is cooled at a rate of 5-10℃ / s to below 40℃, and the internal stress concentration caused by rapid cooling is avoided; the winding group is driven by a torque motor, the winding tension is automatically adjusted according to the thickness of the plate, the range is 100-300N, the winding speed is linked with the overall running speed of the laminating machine, and the encoder is used for real-time monitoring and synchronous adjustment.

[0028] In the embodiment, the laminating mechanism is closely arranged at the outlet end of the heating box, and the iron plate is quickly received by the buffer roller group, so that the transmission distance of the iron plate is greatly shortened, the iron plate enters the laminating mechanism to activate the adhesion of the adhesive layer on the iron plate by using the residual heat, the power consumption of the preheating and pressing group of the laminating machine is reduced, the preheating time is shortened, the adhesion between the iron plate and the colored film is improved, the production cost is greatly reduced, and efficient and energy-saving production is realized.

[0029] In some specific embodiments, a temperature sensor is arranged on the preheating and pressing group, the residual heat of the iron plate is monitored, and the heating power and the pressing pressure are dynamically adjusted. For example, when the residual heat of the iron plate is high, the pressing pressure is automatically reduced to avoid excessive flow of glue and deformation of the film material; when the residual heat is insufficient, the preheating effect is strengthened to ensure that the glue is fully activated. The dynamic adjustment can effectively improve the adhesion of the adhesive layer and improve the quality and stability of the laminated product.

[0030] Specifically, the preheating and pressing group includes a driving steel roller and a driven silica gel roller, temperature sensors are arranged at the inlet, the middle position and the outlet of the driving steel roller and the driven silica gel roller respectively, and the temperature change of the iron plate and the colored film is monitored in real time. The driving steel roller and the driven silica gel roller are driven by hydraulic pressure, the pressure adjustment range is 0.8-2.0 MPa, when the residual heat of the iron plate is ≥70℃, the pressure is automatically set to 1.2-1.3 MPa; when the residual heat of the iron plate is <60℃, the pressure is increased to 1.5-1.8 MPa.

[0031] It should be noted that the components of the gluing mechanism and the film coating mechanism not mentioned are implemented by conventional techniques in the prior art, such as the unwinding group is provided with an unwinding frame, the film tearing group includes a power and transmission device driving the film tearing knife assembly, the buffer roller group is provided with a tension control device, the preheating and pressing group is provided with a heating device, the cooling group is provided with an air cooling device and a cold water tank, the winding group is provided with a power winding frame, etc., and the positional relationship between the components not mentioned and the components located on the side or in the up-down direction of another component can be arranged by technicians according to conventional means in combination with the actual use site size and environment. Therefore, the embodiments do not limit the structure of the components not mentioned for realizing their own functions and the positional relationship between the components, and technicians can set them according to actual use requirements, and this document does not excessively elaborate.

[0032] For better understanding, embodiments of the present application provide a specific structure and preparation method of a colored film, which comprises, in sequence, a base film, a release agent layer, a protective resin layer, a colored resin layer, an aluminum plating layer and an adhesive layer. The preparation steps of the colored film include: A transparent and high-brightness PET base film with a thickness of 16-19 μm is prepared, the surface of the base film is checked for flatness, scratches, bubbles and other defects, and the quality of the base film is ensured to meet the requirements. The qualified PET base film is installed on the unwinding device, the unwinding tension is adjusted by the tension control system, and the tension is controlled at 15-25 N to make the base film expand smoothly and uniformly, avoiding deformation or wrinkles of the base film caused by uneven tension; Silicone oil is used as the release agent, and the gravure printing or micro-embossing coating process is used for coating. The silicone oil is first diluted to a suitable viscosity, and the solid content is controlled at 1%-3% to ensure that the release agent layer is uniform and has a moderate thickness, so that the release agent uniformly covers the surface of the base film to form a release agent layer with a thickness of 0.3-0.5 μm. After coating, the base film is sent into a drying channel and dried at a temperature of 60-80°C to fully volatilize the solvent and ensure the drying and curing of the release agent layer, thereby enhancing the adhesion to the base film and ensuring the coating effect of the subsequent coating layer; A two-component polyurethane resin or an acrylic resin is selected as the material of the protective resin layer. If a two-component polyurethane resin is selected, the hydroxyl component and the isocyanate component are mixed at a molar ratio of 1:1.2-1:1.5, and an appropriate amount of solvent is added for dilution to adjust the viscosity to 80-120 s (coating-4 cups, 25°C). If an acrylic resin is used, it can be directly used or 1%-3% of a photoinitiator (such as 1173) can be added as needed to adjust the viscosity to 60-100 s (coating-4 cups, 25°C). Use roller coating or knife coating to evenly cover the surface of the release agent layer with the protective resin. The coating thickness should be controlled at 8-12μm. After coating, it will cure quickly to form a hard and wear-resistant protective resin layer. If it is a two-component polyurethane resin, after coating, the composite film will be sent to the curing room and cured at 60-80℃ for 15-20 minutes to fully cross-link the resin. If it is an acrylic resin, after coating, it will be immediately put into the UV curing equipment and irradiated with ultraviolet light with a wavelength of 365nm and an intensity of 800-1200mW / cm² for 3-5 seconds to quickly cure the resin and form a hard and wear-resistant protective resin layer. The color crystal and the resin slurry are mixed and dispersed to form a colored resin material coated on the protective resin layer, the colored resin is coated on the protective resin layer by knife coating or roller coating, and cured after coating to form a high temperature resistant and uniform colored resin layer; The cured composite film is fed into a vacuum evaporation machine for aluminum coating using a resistance heating evaporation source or an electron beam evaporation source. The vacuum chamber is first evacuated to a vacuum of ≤10-³Pa. Aluminum wire or aluminum particles with a purity of ≥99.99% are then placed into the evaporation source. The evaporation temperature is controlled at 1200-1400°C for resistance heating and 1400-1600°C for electron beam evaporation to fully vaporize the aluminum. Aluminum vapor is evenly deposited on the surface of the colored resin layer at a deposition rate of 0.5-2nm / s. The thickness of the aluminum coating is controlled at 50-200nm, forming an aluminum coating with a mirror-like effect. During the aluminum coating process, the composite film's conveying speed is controlled at 3-5m / min, and the vacuum chamber temperature is maintained at 40-60°C to ensure a uniform, dense aluminum coating with excellent mirror-like reflection. A single-component polyurethane is selected as the material for the adhesive layer and is applied by roller coating or spraying so that the single-component polyurethane is evenly covered on the surface of the aluminum-plated layer. After coating, the composite film is sent to a moisture curing chamber so that the single-component polyurethane is cross-linked and cured by reacting with moisture in the air to form a strong adhesive layer. This adhesive layer is used to bond with the adhesive layer of the iron plate and also serves as a protective layer for the aluminum-plated layer before being composited with the substrate, isolating the aluminum-plated layer from the external environment and inhibiting oxidation of the aluminum layer.

[0033] like Figure 1 As shown, in some embodiments, the heating box 300 has: The box body 310 has active rollers 320 driven by a variable frequency motor at its inlet and outlet, and a plurality of rollers 330 are provided inside the box body 310. The active rollers 320 driven by a variable frequency motor at the inlet and outlet of the box body 310 cooperate with the supporting structure of the rollers 330 inside the box body 310 to ensure that the iron plate remains stable during long-distance transportation, thereby avoiding uneven heating or equipment damage caused by shaking or falling of the iron plate. The box body 310 adopts a segmented heating setting, which is divided into a low-temperature zone 311 in the front section, a high-temperature zone 312 in the middle section, and a heat preservation zone 313 in the rear section. A low-temperature heating element, a high-temperature heating element, and a heat preservation heating element are respectively provided corresponding to the low-temperature zone 311, the high-temperature zone 312, and the heat preservation zone 313. The low-temperature heating element, the high-temperature heating element, and the heat preservation heating element are respectively provided with an upper part and a lower part, and the upper and lower parts of the heating elements are correspondingly erected above and below the walking path of the iron plate; specifically, each temperature zone has an independent solid-state relay and a PID temperature control instrument, and the temperature control instrument receives data from a K-type thermocouple temperature sensor. When the measured temperature is lower than the set value, the solid-state relay increases the power of the heating element proportionally; when it is higher than the set value, the power is reduced to achieve a small temperature deviation; The hot air circulation device 340 includes a hot air input duct, a hot air output duct 342, and several groups of centrifugal fans 341. The centrifugal fans 341 are located in the middle of the top of the box 310 and distributed along the direction of the iron plate. One side is connected to the hot air input duct, and the other side blows into the box 310. The hot air output duct is located at the bottom of the box 310. The hot air circulation device 340 drives the hot air through the top centrifugal fans 341, and circulates it within the box through the hot air input duct and hot air output duct 342. The guide plate guides the heat flow, ensuring that the hot air fully contacts the surface of the iron plate, thereby improving heat exchange efficiency. The ventilation and exhaust device 350 comprises several exhaust ducts arranged on the top or sides of the box. Specifically, four exhaust ducts with a diameter of 150 mm are evenly distributed and symmetrically arranged on the top of the box; alternatively, two rows of three exhaust ducts are arranged on the sides of the box to ensure timely exhaust of exhaust gases from the box. The exhaust ducts are equipped with electric dampers, which are automatically adjusted by a PLC control system. When the concentration of harmful gases exceeds the standard, the exhaust volume is increased; when the concentration drops to a safe range, the exhaust volume is reduced, achieving energy-saving operation. The ventilation and exhaust device uses the exhaust ducts on the top or sides to promptly exhaust harmful gases such as organic solvent vapor and reaction exhaust generated during the glue curing process. This maintains clean air inside the box, prevents the accumulation of harmful gases from negatively impacting the glue's performance, and ensures the health and safety of operators. Furthermore, the exhaust process adjusts the humidity and air pressure inside the box to meet the environmental requirements of different types of glue. This makes the heating box compatible with a variety of mainstream industrial glues, such as one-component polyurethane and two-component epoxy glue, effectively meeting diverse production needs.

[0034] In this embodiment, by dividing the box into a low-temperature zone, a high-temperature zone, and a heat preservation zone, precise segmented temperature control of the glue curing process is achieved. For single-component polyurethane glue, the low-temperature zone of 40-60°C is preheated to activate molecular activity, the high-temperature zone of 120-150°C accelerates the cross-linking reaction, and the heat preservation zone of 80-100°C promotes complete curing. Compared with the traditional single heating method, the degree of glue curing is effectively improved, effectively avoiding local overheating and burning or incomplete curing problems. At the same time, the heating elements are symmetrically distributed up and down, and cooperate with the hot air circulation device to minimize the temperature deviation of each temperature zone in the box, ensuring that the glue on the surface of the iron plate is heated evenly.

[0035] In some specific embodiments, the hot air input duct is constructed of 200mm diameter stainless steel pipe with a 3mm wall thickness, and the inner wall is smoothed to reduce air resistance. The hot air output duct is 250mm in diameter and also made of stainless steel. A regulating valve is installed at the end of the duct to adjust the exhaust volume according to production requirements. The centrifugal fan is a high-temperature resistant centrifugal fan (model: DF-N1200, air volume 5000-10000 m³ / h, air pressure 300-500 Pa). Adjacent centrifugal fans are spaced 1-1.5 meters apart and evenly spaced along the direction of the iron plate's movement. The other ends of the hot air input and output ducts are connected to an external hot air heating unit. This hot air heating unit can be independently configured to meet the temperature requirements of different temperature zones, or a single unit can be shared by all three zones. This can be implemented using existing technology based on actual needs. This embodiment does not impose any restrictions on the specific structure of the hot air heating unit or the means for achieving hot air circulation.

[0036] In some embodiments, the low-temperature heating element is a ceramic heating tube, the high-temperature heating element is a high-temperature resistance wire heating assembly, and the heat-insulating heating element is an infrared heating plate.

[0037] Specifically, the ceramic heating tube is fixed to the upper and lower parts of the box through a high-temperature resistant ceramic bracket. The bracket and the box are connected with bolts for easy disassembly and replacement; the high-temperature resistance wire heating component adopts a frame structure, and the resistance wire is wrapped around the high-temperature resistant ceramic frame. The frame is fixed to the inside of the box through a high-temperature resistant insulating clamp, and stainless steel reflective plates are installed around it. The distance between the reflective plate and the frame is 50-80mm to enhance the heat reflection effect; the infrared heating plate is embedded in the box wall through an aluminum alloy mounting frame, and high-temperature resistant sealant is filled between the mounting frame and the box to ensure sealing and heat insulation.

[0038] In some specific embodiments, each heating element is connected to a corresponding solid-state relay via a high-temperature resistant wire. The control end of the solid-state relay is connected to the output port of a PID temperature control instrument. A K-type thermocouple temperature sensor is arranged at the center of each temperature zone. The temperature signal is transmitted to the temperature control instrument via a compensation wire, forming a complete temperature closed-loop control system, ensuring that the heating element accurately adjusts the power according to the actual temperature. In some more specific embodiments, a high-temperature resistant quartz protective sleeve is installed on the outside of the ceramic heating tube to prevent mechanical damage and dust contamination. A protective cover made of stainless steel with a mesh diameter of 2-3mm is provided for the high-temperature resistance wire heating component to ensure ventilation and heat dissipation while preventing foreign matter from entering. The surface of the infrared heating plate is sprayed with a high-temperature resistant anti-oxidation coating to extend its service life. At the same time, an overheating protection device is installed inside the box. When the temperature of the heating element exceeds a set threshold (such as exceeding 800°C for the ceramic heating tube, exceeding 1200°C for the high-temperature resistance wire, and exceeding 500°C for the infrared heating plate), the power supply is automatically cut off to ensure safe operation of the equipment.

[0039] In this embodiment, the ceramic heating tube outputs gentle and stable heat in the low-temperature zone (40-60°C) to slowly increase the temperature of the iron plate, which is particularly suitable for the preheating stage of single-component polyurethane glue to activate the activity of the glue; the high-temperature resistance wire heating component quickly heats up in the high-temperature zone (120-150°C), providing sufficient heat for the glue cross-linking reaction and accelerating the curing process; the infrared heating plate maintains a constant temperature in the insulation zone (80-100°C) with precise temperature control characteristics, promotes the complete curing of the glue, improves the overall curing effect, and effectively solves the problem of unstable glue curing quality in traditional processes.

[0040] This embodiment, through the combination of three heating elements, is compatible with a variety of mainstream industrial adhesives, including one-component polyurethane, two-component epoxy, and polyimide adhesives. For example, polyimide adhesive requires slow solvent removal at low temperatures, followed by high-temperature imidization, and finally thermal insulation to stabilize the structure. This embodiment precisely meets these process requirements, improving the versatility of the equipment and effectively addressing the limited range of adhesives it can accommodate.

[0041] like Figure 2 As shown, in some embodiments, guide plates 360 are provided in the box body 310 corresponding to the low temperature zone, the high temperature zone, and the heat preservation zone. The guide plates 360 include an inclined side plate 361 and a rotating arc plate 362 provided on the inner side of the box body 310. One side end of the inclined side plate 361 is connected to the top of the box body 310, and the other side end is connected to the inner side surface of the box body 310, and is arranged in an inclined manner; The rotating arc plate 362 is lower than the iron plate ( Figure 2The solid black part in the middle represents the iron plate) walking path setting, and one side end is smoothly connected to the inner side of the box 310, the middle section is an arc structure, and the other side end extends along the tangent direction of the arc end and points to the bottom side of the iron plate.

[0042] In this embodiment, the centrifugal fan 341 drives the hot air circulation, and cooperates with the inclined side plate 361 and the rotating arc plate 362 to guide the heat flow. The hot air first flows from the top of the box 310 to the upper surface of the iron plate, flows in the horizontal plane at the upper surface of the iron plate, and flows to the gap between the iron plate and the box 310 at the edge of the iron plate. Then, it is guided by the rotating arc plate 362 and the inner surface of the box 310 in a smooth transition, enters the middle arc structure, and uses the arc surface of the arc structure to change direction. Finally, it flows toward the bottom side of the iron plate along the tangential direction of the arc end. Part of the hot air flows again along the bottom side of the iron plate to improve the heating uniformity of the iron plate. Part of the hot air enters the box through the hot air output pipe, the hot air heating unit, the hot air input pipe, and the centrifugal fan to form a circulation, ensuring that the glue is evenly cured on the surface of the iron plate.

[0043] like Figure 1 and Figure 2 As shown, in some embodiments, the roller 330 is arranged perpendicular to the traveling direction of the iron plate, and a support structure is arranged below the roller 330. The support structure includes a base 331, a support column 332, an electric push rod 333 arranged in the support column 332, and a support beam 334 mounted at the end of the electric push rod 333. The roller 330 is mounted on the support beam 334.

[0044] Traditional heating boxes cannot handle the effects of the weight of the iron sheet during long-distance transport, often causing it to sag, resulting in glue accumulation in recessed areas and uneven adhesive layer thickness. This embodiment, through the combination of an electric push rod and support beam, can adjust the roller height, effectively avoiding the problem of glue flow concentration caused by the iron sheet sag.

[0045] In some specific embodiments, a laser ranging sensor is set to obtain the horizontal position of the iron plate. When the laser ranging sensor detects that the iron sheet has dropped by more than 5 mm, the electric push rod can respond within 0.5 seconds and raise the roller height to a suitable position to ensure that the iron plate always remains horizontal. During the long-distance transmission process, the amount of drop of the iron plate is controlled within the allowable range, effectively avoiding the problem of glue flow concentration caused by the drop of the iron sheet.

[0046] The DT50 electric linear actuator features a travel range of 0-100mm, a maximum thrust of 100N, a speed of 10mm / s, a repeatability of ±0.1mm, an operating voltage of 24V DC, and an IP65 rating to withstand the high-temperature, dusty working environment of the heating chamber. The linear actuator is fixedly connected to the bottom of the hollow support column via a flange. The telescopic shaft of the linear actuator is fixedly connected to the support beam. The top of the support beam features a U-shaped groove that matches the roller shaft. The groove is inlaid with a wear-resistant copper sleeve. The roller shaft is inserted into the sleeve and secured with locking nuts on both sides to ensure a secure roller installation.

[0047] like Figure 2 As shown, in some embodiments, an upper connecting plate and a lower connecting plate are provided between the support beam 334 and the electric push rod 333. The lower connecting plate is fixedly connected to the end of the electric push rod 333, and the upper connecting plate is fixedly connected to the support beam 334. A compression spring member 335 is provided between the upper and lower connecting plates. The compression spring member adopts a cylindrical coil spring, which can effectively buffer the vibration generated during the transmission of the iron plate and realize adaptive support according to the deadweight of the iron plate.

[0048] like Figure 1 As shown, in some embodiments, a cleaning mechanism 500 is provided between the unwinding mechanism 100 and the gluing mechanism 200, and the cleaning mechanism 500 includes a pre-spraying area, a main cleaning area, and a rinsing area; The pre-spraying area is provided with a low-pressure water nozzle, which uses low-pressure water to preliminarily rinse the surface of the iron plate to wash away larger particles of impurities; The main cleaning area includes a high-pressure spray head and a brush roller. The high-pressure spray head is located above the iron plate travel path. The brush roller is set on the upper side and the lower side of the iron plate travel path. The cleaning liquid containing metal detergent is sprayed on the iron plate at high pressure through the high-pressure spray head and brushed by the brush roller. The rinsing area is provided with a clean water nozzle to rinse away the residual cleaning agent with clean water.

[0049] Traditional iron plate pretreatment processes often lack a systematic cleaning process, resulting in residual dust, oil, rust and other impurities on the surface of the iron plate. These impurities will hinder the effective bonding of glue and iron plate, causing defects such as bubbles and degumming after lamination. The cleaning mechanism of this embodiment can efficiently remove impurities on the surface of the iron plate through a three-level cleaning process of pre-spraying area, main cleaning area and rinsing area. The clean iron plate surface provides a good adhesion basis for glue.

[0050] In some specific embodiments, the low-pressure water nozzles are arranged equidistantly above the path of the iron plate, with a spacing of 200-300 mm, to ensure full coverage across the width of the iron plate. Similar nozzles are positioned below the path to achieve double-sided flushing. The low-pressure water nozzles are connected to an independent water supply tank via a water supply pipe. A liquid level sensor is installed in the tank, which automatically replenishes water when the water level falls below a set value.

[0051] The high-pressure spray nozzles utilize solid conical shapes. Two rows of nozzles are arranged above the iron plate, staggered 150mm apart. A row of nozzles is positioned below, corresponding to the upper rows, ensuring thorough cleaning. The brush roller is made of nylon 66, with bristles 0.3mm in diameter and 30mm in length, offering a moderate hardness (Shore A hardness of 70). The brush roller has a diameter of 100mm and is 200mm longer than the width of the iron plate. Both ends are secured to the bracket via bearing blocks and driven by a variable-frequency motor with an adjustable speed between 600-1200 rpm. The main cleaning area features a cleaning fluid circulation tank equipped with an agitator and internal circulation pump. The agitator ensures uniform cleaning fluid concentration, while the circulation pump transports the cleaning fluid from the tank to the high-pressure spray nozzles. Returning cleaning fluid passes through a filter and oil-water separator before returning to the circulation tank. The cleaning fluid concentration is regularly monitored, and metal cleaner is automatically added when it falls below a set value.

[0052] Flat-type nozzles are used for the fresh water, with two to three nozzles positioned linearly above and below the iron plate. A drainage trough with a 1% slope is located below the rinsing area to ensure smooth drainage of wastewater. The drainage pipe is connected to the sewage treatment system, and a flow meter is installed on the pipe to monitor the discharge volume in real time.

[0053] like Figure 1 As shown, in some embodiments, a leveling and straightening mechanism 600 is provided between the cleaning mechanism 500 and the gluing mechanism 200. The leveling and straightening mechanism includes a leveling and straightening device 610 having multiple sets of rollers. The leveling and straightening device compresses and stretches the iron plate through the multiple sets of rollers to correct the bending and wavy shape defects of the iron plate and make the iron plate flat. The flat iron plate surface helps the gluing mechanism to evenly apply glue, avoiding glue accumulation or missing coating caused by unevenness of the iron plate.

[0054] In this embodiment, multiple roller sets are driven by a variable-frequency motor via a synchronous belt. There are 5-7 sets of upper and lower rollers arranged in a staggered arrangement. The rollers are longer than the width of the iron plate to ensure full coverage across the width of the plate. The upper rollers are fixed, while the lower rollers are adjustable via hydraulic cylinders. The spacing between adjacent roller sets is 300-400mm, and the centerlines of the upper and lower rollers are offset by 20mm, creating a staggered squeezing effect and enhancing correction capabilities.

[0055] As shown in some embodiments, the leveling and straightening mechanism 600 also includes a passivation groove 620, which is located on one side of the multiple groups of rollers. The iron plate after leveling and straightening enters the passivation groove 620 for passivation treatment, forming a dense passivation film on the surface of the iron plate.

[0056] In this embodiment, after leveling and straightening, the iron plate is immediately placed in a passivation tank for treatment, forming a dense passivation film approximately 0.5-1 μm thick on its surface. This passivation film effectively isolates the iron plate from direct contact with the external environment, improving its corrosion resistance. It should be noted that the size and material of the passivation tank are determined based on actual production requirements. The passivation solution circulation and replenishment, as well as the iron plate transport and positioning, are implemented using existing technologies. For example, two sets of parallel stainless steel transport rollers are installed within the passivation tank. These rollers are driven by a variable frequency motor via a chain, with a rotational speed adjustable within a range of 5-15 rpm. This ensures that the iron plate passes smoothly through the passivation tank at an appropriate speed, with a residence time within the tank controlled to 3-5 minutes to ensure sufficient passivation reaction. For example, a set of photoelectric sensors are installed at the entrance and exit of the passivation tank to detect the position and operating status of the iron plate. When the iron plate enters the passivation tank, the photoelectric sensors trigger the transport rollers to start; when the iron plate is about to leave the passivation tank, the transport rollers automatically slow down to match the rhythm of subsequent processes.

[0057] In some embodiments, the leveling and straightening mechanism also includes an infrared heating drying box 630, which is arranged on one side of the passivation tank 620. After the passivation treatment, the iron plate enters the infrared heating drying box 630, and the infrared heating drying box 630 dries the moisture on the surface of the iron plate.

[0058] In the embodiment, the infrared heating drying box can quickly and efficiently dry the moisture on the surface of the iron plate, so that the surface of the iron plate reaches a dry state, avoiding the risk of rust caused by residual moisture, further consolidating the corrosion resistance formed by the passivation treatment, and extending the storage and use cycle of the iron plate. It should be noted that the box structure of the infrared heating drying box is set according to actual production needs, and its heating means and iron plate transmission method adopt existing technologies. For example, near-infrared heating tubes are used as heating elements, which are evenly arranged at the top and bottom of the drying box to ensure that the upper and lower surfaces of the iron plate are evenly heated. For example, three groups of stainless steel transmission rollers are set in the drying box, and the surface of the transmission rollers is polished to reduce the friction coefficient. The transmission rollers are driven by a servo motor through a synchronous belt to ensure a stable transmission speed.

[0059] The above specifically describes the preferred embodiments of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A laminating device, characterized in that: include: An unwinding mechanism (100) for unwinding the iron coil; A gluing mechanism (200) is used to evenly apply glue to the surface of the iron plate unrolled from the iron coil by roller coating, spraying or scraping; A heating box (300) is provided at the outlet of the gluing mechanism (200), and the iron plate directly enters the heating box (300) after being glued; The laminating mechanism (400) is arranged at the outlet end of the heating box (300), and comprises an unwinding group (410), a film tearing group (420), a buffer roller group (430), a preheating pressing group (440), a cooling group (450), and a winding group (460). The unwinding group (410) is connected to the film tearing group (420) and is used to peel off the base film of the pre-prepared colored film. The buffer roller group (430) is arranged at the preheating pressing group (440). The preheating and pressing group (440) and the outlet end of the heating box (300) are used to adjust the movement of the iron plate so that the iron plate with residual temperature directly enters the preheating and pressing group (440). The preheating and pressing group (440) preheats and presses the iron plate and the colored film after the base film is peeled off. The cooling group (450) is located on one side of the preheating and pressing group (440) to cool the pressed colored plate and rewind it through the rewinding group (460).

2. A film laminating device according to claim 1, characterized in that: The heating box (300) has: A box body (310), wherein an inlet and an outlet of the box body (310) are respectively provided with active rollers (320) driven by a variable frequency motor, and a plurality of rollers (330) are provided in the box body (310); the box body (310) adopts a segmented heating setting, which is divided into a low-temperature zone (311) in the front section, a high-temperature zone (312) in the middle section, and a heat preservation zone (313) in the rear section, and a low-temperature heating element, a high-temperature heating element, and a heat preservation heating element are respectively provided corresponding to the low-temperature zone (311), the high-temperature zone (312), and the heat preservation zone (313); the low-temperature heating element, the high-temperature heating element, and the heat preservation heating element are respectively provided with an upper part and a lower part, and the upper part and the lower part of the heating element are correspondingly arranged above and below the walking path of the iron plate; A hot air circulation device (340) comprises a hot air input duct, a hot air output duct (342), and a plurality of centrifugal fans (341). The centrifugal fans (341) are arranged in the middle of the top of the box (310) and distributed along the direction in which the iron plates travel. One side of the centrifugal fans is connected to the hot air input duct, and the other side blows air into the box (310). The hot air output duct (342) is arranged at the bottom of the box (310). The ventilation and exhaust device (350) has a plurality of exhaust ducts arranged on the top or side of the box body (310).

3. A laminating device according to claim 2, characterized in that: The low-temperature heating element is a ceramic heating tube, the high-temperature heating element is a high-temperature resistance wire heating component, and the heat-insulating heating element is an infrared heating plate.

4. The laminating device according to claim 2, characterized in that: Guide plates (360) are provided in the box (310) corresponding to the low-temperature zone (311), the high-temperature zone (312), and the heat preservation zone (313). The guide plates (360) include an inclined side plate (361) and a rotating arc plate (362) provided on the inner side of the box (310). One side end of the inclined side plate (361) is connected to the top of the box body (310), and the other side end is connected to the inner side surface of the box body (310), and is arranged in an inclined manner; The rotating arc plate (362) is set below the walking path of the iron plate, and one side end is smoothly connected to the inner side surface of the box (310), the middle section is an arc structure, and the other side end extends along the tangent direction of the arc end and points to the bottom side surface of the iron plate.

5. The laminating device according to claim 2, characterized in that: The roller (330) is arranged perpendicular to the direction in which the iron plate travels. A support structure is provided below the roller (330). The support structure comprises a base (331), a support column (332), an electric push rod (333) provided in the support column (332), and a support beam (334) mounted at the end of the electric push rod (333). The roller (330) is sleeved on the support beam (334).

6. The laminating device according to claim 5, characterized in that: An upper connecting plate and a lower connecting plate are provided between the support beam and the electric push rod (333); the lower connecting plate is fixedly connected to the end of the electric push rod (333); the upper connecting plate is fixedly connected to the support beam (334); and a compression spring member (335) is provided between the upper connecting plate and the lower connecting plate.

7. The laminating device according to claim 1, characterized in that A cleaning mechanism (500) is provided between the unwinding mechanism (100) and the gluing mechanism (200), and the cleaning mechanism (500) includes a pre-spraying area, a main cleaning area, and a rinsing area; The pre-spraying area is provided with a low-pressure water nozzle, which uses low-pressure water to preliminarily rinse the surface of the iron plate to wash away larger particles of impurities; The main cleaning area includes a high-pressure spray head and a brush roller. The high-pressure spray head is located above the iron plate travel path. The brush roller is set on the upper side and the lower side of the iron plate travel path. The cleaning liquid containing metal detergent is sprayed on the iron plate at high pressure through the high-pressure spray head and brushed by the brush roller. The rinsing area is provided with a clean water nozzle to rinse away the residual cleaning agent with clean water.

8. The laminating device according to claim 7, characterized in that: A leveling and straightening mechanism (600) is provided between the cleaning mechanism (500) and the gluing mechanism (200). The leveling and straightening mechanism (600) comprises a leveling and straightening device (610). The leveling and straightening device (610) comprises a plurality of rollers. The plurality of rollers are used to squeeze and stretch the iron plate to correct bending and wavy defects of the iron plate, so that the iron plate reaches a flat state.

9. The laminating device according to claim 8, characterized in that: The leveling and straightening mechanism (600) further comprises a passivation groove (620), wherein the passivation groove (620) is located on one side of the plurality of roller groups. The iron plate after leveling and straightening enters the passivation groove (620) for passivation treatment, thereby forming a dense passivation film on the surface of the iron plate.

10. The laminating device according to claim 9, characterized in that: The leveling and straightening mechanism (600) further comprises an infrared heating drying box (630), wherein the infrared heating drying box (630) is arranged on one side of the passivation tank (620); the iron plate enters the infrared heating drying box (630) after passivation treatment, and the infrared heating drying box (630) dries moisture on the surface of the iron plate.

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