A double-sided film coating apparatus for metal strip

Abstract

The present application relates to film covering equipment technical field, specifically to a kind of double-sided film covering equipment of metal strip, it includes rack, film covering mechanism, exhaust roller and winding roller;Two film covering mechanisms are provided, two film covering mechanisms are symmetrically arranged in the upper and lower sides of strip body, so that the film covering work of the double sides of strip body is simultaneously completed, with higher film covering efficiency.Film covering mechanism includes material winding roller and first heating roller sequentially arranged along the first direction, exhaust roller is located between material winding roller and first heating roller, baffle is arranged between roller body and film material, at least one blade on roller body is sealed and abuts with strip body in initial state, at least one blade is sealed and abuts with baffle;Exhaust roller is connected with driving assembly, and driving assembly is used to drive exhaust roller to rotate, exhaust roller is driven to rotate by driving assembly, gas between film material and strip body is discharged before film covering, so that film covering bubble problem is effectively solved, and film covering quality and yield are improved.

Description

Technical Field

[0001] This invention relates to the field of coating equipment technology, and specifically to a double-sided coating equipment for metal strips. Background Technology

[0002] Metal strip coating is a technology that uses a thermo-pressing process to coat a metal surface with a protective or decorative film. A typical coating unit consists of an unwinding unit, a heated roller assembly, and a rewinding unit. The heated rollers use heat and pressure to bond the pre-coated hot melt adhesive film to the metal strip surface. To further improve production efficiency and avoid the thermal stress asymmetry problem inherent in single-sided coating, a double-sided coating mechanism has been developed. This mechanism uses symmetrically arranged coating units, allowing simultaneous coating operations on both sides of the strip, effectively improving production efficiency and product quality consistency.

[0003] However, existing lamination equipment commonly suffers from bubble defects during actual production, severely impacting product aesthetics and lifespan. The main causes of bubble formation include: First, during processing and storage, metal strips easily absorb contaminants such as grease and dust. These impurities hinder the effective bonding of hot melt adhesive to the substrate during lamination, forming microscopic air cavities. Second, when the lamination speed is too high, air at the interface between the film and strip cannot be completely expelled and remains trapped within the adhesive layer, forming bubbles. Furthermore, under high humidity conditions, the strip surface absorbs moisture, which vaporizes during heating, becoming water vapor that cannot escape in time and remains trapped at the lamination interface. These bubble defects not only affect product appearance but also reduce the adhesion, corrosion resistance, and lifespan of the lamination layer, leading to decreased product yield and increased production costs. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention proposes a double-sided coating equipment for metal strips, which solves the problem of air bubble defects in the coating equipment of the prior art.

[0005] The double-sided coating equipment for metal strips of the present invention adopts the following technical solution, including: A frame on which a feeding roller is rotatably mounted. The feeding roller is used to wind up the strip body, and the released strip body extends along a first direction. There are two laminating mechanisms, located on the upper and lower sides of the released strip body, respectively. Each laminating mechanism includes a winding roller and a first heating roller arranged sequentially along a first direction, both of which are rotatably mounted on the frame. The winding roller is used to wind up the film material, one side of which has an adhesive layer, with the adhesive layer of the released film material facing the strip body. The first heating roller has a heating element inside, used to heat the film material to melt the adhesive layer and press the film material onto the surface of the strip body. There are two exhaust rollers, located on the upper and lower sides of the strip body respectively, between the winding roller and the first heating roller. Each exhaust roller includes a roller body and multiple blades. The blades are evenly distributed circumferentially along the roller body and extend radially along the roller body, and are radially movable on the roller body. A spring is provided between the roller body and the blades, which causes the blades to tend to move outward. A baffle is provided between the roller body and the film. In the initial state, at least one blade on the roller body is in sealed contact with the strip body, and at least one blade is in sealed contact with the baffle. The exhaust roller is connected to a drive assembly, which is used to drive the exhaust roller to rotate. The take-up roller is rotatably mounted on the frame and is used to take up the coated strip body.

[0006] Optionally, the coating mechanism further includes a licker-in roller and a second heating roller. The licker-in roller is mounted on the frame and is located between the first heating roller and the take-up roller. The peripheral wall of the licker-in roller is provided with multiple spikes. The sum of the distance between the axis of the licker-in roller and the outer end of the spikes and the thickness of the film is equal to the distance between the axis of the licker-in roller and the end face of the strip body facing the licker-in roller. The second heating roller is rotatably mounted on the frame and is located between the licker-in roller and the take-up roller. The second heating roller is provided with a heating element inside for reheating the film and pressing the film onto the surface of the strip body.

[0007] Optionally, a pressure holding roller is mounted on the frame in a vertically movable manner, and the pressure holding roller is located above the first heating roller and the second heating roller.

[0008] Optionally, the licker roller is rotatably mounted on the frame, and an angle sensor is provided at the end of the licker roller to record the angle of rotation of the licker roller. An adjustment mechanism is provided inside the roller body to adjust the length of the blades extending out of the roller body according to the angle of rotation of the licker roller per unit time.

[0009] Optionally, the adjustment mechanism includes an air pump, an air passage, and multiple movable plates; multiple mounting slots are evenly distributed circumferentially inside the roller body, and multiple movable plates are respectively mounted radially in the multiple mounting slots; one end of the spring abuts against the movable plate, and the other end abuts against the blade; the movable plate is sealed to the mounting slot, and the inner surface of the movable plate and the mounting slot define an adjustment cavity; the air passage connects multiple adjustment cavities; the air pump is used to adjust the air pressure in the air passage according to the rotation angle of the licker roller per unit time; the greater the rotation angle of the licker roller, the greater the pressure in the air passage.

[0010] Optionally, the coating mechanism also includes a flattening roller and multiple guide rollers; the flattening roller is rotatably mounted on the frame and located between the roll roller and the exhaust roller, for flattening the film material; the multiple guide rollers are rotatably mounted on the frame for guiding and adjusting the transmission path and tension of the film material.

[0011] Optionally, the drive assembly includes a drive wheel and a driven wheel. The drive wheel is synchronously connected to the flattening roller, and the driven wheel is synchronously connected to the exhaust roller. The driven wheel meshes with the drive wheel.

[0012] Optionally, a cooling mechanism is provided between the take-up roller and the second heating roller; the cooling mechanism is used to cool the strip body after coating.

[0013] Optionally, the cooling mechanism includes multiple cooling rollers, which are spaced apart in a first direction and staggered in a vertical direction, and the coated strip body is wrapped around the multiple cooling rollers.

[0014] Optionally, a sealing gasket is connected to the outer end of the blade.

[0015] The beneficial effects of this invention are as follows: By setting coating mechanisms on both the upper and lower sides of the strip body, this invention can simultaneously complete the coating work on both sides of the strip body, resulting in high coating efficiency. Furthermore, by setting an exhaust roller rotatably mounted on the frame and using a drive assembly to rotate the exhaust roller, gas entering between the film material and the strip body is discharged before coating. Additionally, the blades can scrape away impurities from the surface of the strip body, effectively solving the problem of air bubbles during coating and improving coating quality and yield.

[0016] Furthermore, this invention incorporates a piercing roller and a second heating roller positioned between the first heating roller and the take-up roller. The heating element in the second heating roller raises its temperature. The strip body, after its initial coating, passes between the upper and lower piercing rollers. Since the sum of the distance from the piercing roller axis to the outer end of the spike and the film thickness equals the distance from the piercing roller axis to the end face of the strip body facing the piercing roller, areas without air bubbles can pass smoothly between the upper and lower piercing rollers. When areas containing air bubbles reach between the two piercing rollers, the bubbles bulge towards the piercing rollers. Upon contact with the spikes, the bubbles are punctured, releasing the gas within. Subsequently, the strip body and the upper and lower film layers reach between the two second heating rollers, where they undergo secondary heating and pressing, ensuring the film smoothly adheres to the strip body and sealing the piercings. This completely eliminates air bubbles and improves the smoothness and bonding strength of the coated surface.

[0017] Furthermore, this invention can adaptively adjust the venting effect according to the actual coating effect. When air bubbles are present in the coating, the air bubbles trigger the rotation of the licker roller. If the angle sensor detects that the rotation angle of the licker roller is large per unit time, it indicates that there are many air bubbles. At this time, the air pump increases the air pressure in the adjustment chamber, pushes the moving plate outward and increases the spring preload, so that the blades extend outward to enhance the scraping and venting intensity. If the licker roller is not detected to be rotating, it indicates that no air bubbles are generated. The air pump reduces the air pressure, and the spring rebounds, causing the moving plate and blades to retract inward, reducing friction with the strip body, reducing energy consumption, and improving coating efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a double-sided coating device for metal strips according to the present invention; Figure 2 This is a schematic diagram of the overall structure of a double-sided coating device for metal strips according to the present invention from another perspective; Figure 3 This is a top view of a double-sided coating device for metal strips according to the present invention; Figure 4 for Figure 3 Sectional view of section AA; Figure 5 for Figure 4 Enlarged view at point X; Figure 6 This invention provides a double-sided coating device for metal strips. Figure 3 Schematic diagram of the structure cut at section BB; Figure 7 This is a schematic diagram of the structure of the exhaust roller in a double-sided coating device for metal strip according to the present invention; Figure 8 for Figure 7 Sectional view of the CC section.

[0020] In the picture: 100. Frame; 110. Strip body; 120. Baffle; 200. Coating mechanism; 210. Roller; 211. Film material; 212. Magnetic powder brake; 220. First heating roller; 230. Pinching roller; 240. Second heating roller; 250. Pressure holding roller; 260. Flattening roller; 270. Guide roller; 300, Exhaust roller; 301, Exhaust chamber; 310, Roller body; 320, Blade; 321, Sealing gasket; 330, Spring; 340, Drive assembly; 341, Drive wheel; 342, Driven wheel; 350, Adjustment mechanism; 351, Air pump; 352, Air passage; 353, Moving plate; 354, Adjustment chamber; 400. Take-up roller; 500. Cooling roller. Detailed Implementation

[0021] 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.

[0022] like Figures 1 to 8 As shown, the double-sided coating equipment for metal strip provided by the present invention includes a frame 100, a coating mechanism 200, an exhaust roller 300, and a take-up roller 400.

[0023] A feeding roller is rotatably mounted on the frame 100. The feeding roller is used to wind up the strip body 110, and the released strip body 110 extends along the first direction.

[0024] Two coating mechanisms 200 are provided, located on the upper and lower sides of the released strip body 110 respectively. Each coating mechanism 200 includes a winding roller 210 and a first heating roller 220 arranged sequentially along a first direction, both of which are rotatably mounted on the frame 100. The winding roller 210 is used to wind up the film material 211, one side of which has an adhesive layer, with the adhesive layer of the released film material 211 facing the strip body 110. A magnetic powder brake 212 is provided at the end of the winding roller 210 to control the release speed of the film material 211 and prevent the winding roller 210 from releasing the material too quickly, which would affect the coating effect. The first heating roller 220 has a heating element inside, which is used to heat the film material 211 to melt the adhesive layer and press the film material 211 onto the surface of the strip body 110.

[0025] Two exhaust rollers 300 are provided, located on the upper and lower sides of the strip body 110 respectively; the exhaust rollers 300 are located between the winding roller 210 and the first heating roller 220; the exhaust roller 300 includes a roller body 310 and multiple blades 320; the multiple blades 320 are evenly distributed along the circumference of the roller body 310, the blades 320 extend radially along the roller body 310, and are radially movable on the roller body 310; a spring 330 is provided between the roller body 310 and the blades 320, the spring 330 causing the blades 320 to have an outward tendency; a baffle 120 is provided between the roller body 310 and the film 211, in the initial state, at least one blade 320 on the roller body 310 is in sealed contact with the strip body 110, and at least one blade 320 is in sealed contact with the baffle 120; the exhaust roller 300 is connected to a drive assembly 340, which is used to drive the exhaust roller 300 to rotate.

[0026] The take-up roller 400 is rotatably mounted on the frame 100 and is used to take up the coated strip body 110.

[0027] During the lamination process, the strip body 110 is released from the feed roller and transported horizontally along the first direction. At the same time, the upper and lower winding rollers 210 simultaneously release the film material 211, and the adhesive layer of the film material 211 faces the strip body 110. The released film material 211 passes through the baffle 120 on the side away from the roller body 310.

[0028] The drive assembly 340 drives the roller 310 to rotate. Initially, at least one blade 320 contacts the baffle 120, and at least one blade 320 contacts the strip body 110. The blade 320 in contact with the baffle 120, the blade 320 in contact with the strip body 110, the film material 211, and the strip body 110 define an exhaust chamber 301. During the rotation of the roller 310, the blade 320 rotates synchronously with the roller 310. The blade 320 that abuts against the baffle 120 is compressed, resulting in a shorter length extending beyond the roller 310. When the blade 320 rotates to a preset angle, it disengages from the baffle 120 and continues to rotate. When the blade 320 is no longer under the force of the baffle 120, it extends out of the roller 310 under the action of the spring 330. After rotating to a preset angle, the blade 320 comes into contact with the strip body 110. The blade 320 is subjected to the force of the strip body 110, and the spring 330 is compressed and stores energy. The blade 320 moves radially inward along the roller 310. When the blade 320 disengages from the strip body 110, the gas inside is discharged, thereby reducing the amount of gas entering between the film material 211 and the strip body 110 before coating. This solves the problem of air bubbles on the surface of the strip body 110 after coating and poor coating effect. As the roller 310 continues to rotate, the blade 320 passes over the surface of the strip body 110, cleaning its surface, reducing impurities on the surface of the strip body 110, and further optimizing the coating effect.

[0029] The heating element in the first heating roller 220 increases the temperature of the first heating roller 220. After the film material 211 passes through the baffle 120, when the upper and lower film materials 211 and the strip body 110 reach between the upper and lower first heating rollers 220, the temperature of the film material 211 rises after contact with the first heating roller 220, and the adhesive layer on it melts. The upper and lower film materials 211 are pressed together by the two first heating rollers 220 onto the upper and lower surfaces of the strip body 110 for film coating. The strip body 110 after film coating is wound up by the take-up roller 400.

[0030] This invention can simultaneously complete the film coating work on both sides of the strip body 110, with high film coating efficiency. By setting the exhaust roller 300, the gas entering between the film material 211 and the strip body 110 is discharged before film coating, thereby effectively solving the problem of film coating bubbles and improving film coating quality and yield.

[0031] In a further embodiment, the coating mechanism 200 further includes a shim roller 230 and a second heating roller 240. The shim roller 230 is mounted on the frame 100 and is located between the first heating roller 220 and the take-up roller 400. The peripheral wall of the shim roller 230 is provided with a plurality of spikes. The sum of the distance between the axis of the shim roller 230 and the outer end of the spikes and the thickness of the film 211 is equal to the distance between the axis of the shim roller 230 and the end face of the strip body 110 facing the shim roller 230. The second heating roller 240 is rotatably mounted on the frame 100 and is located between the shim roller 230 and the take-up roller 400. The distance between the axis of the second heating roller 240 and the end face of the strip body 110 facing the second heating roller 240 is equal to the sum of the radius of the second heating roller 240 and the thickness of the film 211. The second heating roller 240 is provided with a heating element for reheating the film 211 and pressing the film 211 onto the surface of the strip body 110.

[0032] This invention, by setting a shim roller 230 and a second heating roller 240 between a first heating roller 220 and a take-up roller 400, and by setting a heating element in the second heating roller 240 to raise its temperature, allows the strip body 110, after its initial coating, to pass between the upper and lower shim rollers 230. Since the sum of the distance between the axis of the shim roller 230 and the outer end of the shim and the thickness of the film 211 is equal to the distance between the axis of the shim roller 230 and the end face of the strip body 110 facing the shim roller 230, areas without air bubbles can be smoothly coated. The material passes between the upper and lower barb rollers 230. When the area containing air bubbles reaches between the two barb rollers 230, the air bubbles bulge towards the barb rollers 230. After contacting the barb, the air bubbles are punctured by the barb, and the gas in the air bubbles is released. After that, the strip body 110 and the upper and lower film materials 211 reach between the two second heating rollers 240. The second heating rollers 240 heat and press them a second time, so that the film material 211 is smoothly attached to the strip body 110 and the puncture holes are sealed, thereby completely eliminating air bubbles and improving the flatness and bonding strength of the coated surface.

[0033] In a further embodiment, a pressure holding roller 250 is mounted on the frame 100 in a vertically movable manner, and the pressure holding roller 250 is located above the first heating roller 220 and the second heating roller 240.

[0034] By setting up the pressure holding roller 250, a stable and controllable pressure is continuously applied to the strip body 110 during the coating and secondary pressing process. The pressure holding roller 250 applies downward pressure to the first heating roller 220 and the second heating roller 240, which solves the problem that the middle part of the first heating roller 220 and the second heating roller 240 is too long and thus affects the coating effect.

[0035] In a further embodiment, the piercing roller 230 is rotatably mounted on the frame 100, and an angle sensor is provided at the end of the piercing roller 230 to record the rotation angle of the piercing roller 230. An adjustment mechanism 350 is provided inside the roller body 310, and the adjustment mechanism 350 is used to adjust the length of the blade 320 extending out of the roller body 310 according to the rotation angle of the piercing roller 230 per unit time.

[0036] The adjustment mechanism 350 includes an air pump 351, an air passage 352, and multiple movable plates 353. Multiple mounting slots are evenly distributed circumferentially inside the roller body 310, and the multiple movable plates 353 are respectively installed radially in the multiple mounting slots. One end of the spring 330 abuts against the movable plate 353, and the other end abuts against the blade 320. The movable plate 353 is sealed to the mounting slot, and the inner surface of the movable plate 353 and the mounting slot define the adjustment cavity 354. The air passage 352 connects the multiple adjustment cavities 354. The air pump 351 is used to adjust the air pressure in the air passage 352 according to the rotation angle of the licking roller 230 per unit time. The larger the rotation angle of the licking roller 230, the greater the pressure in the air passage 352.

[0037] After the bubble comes into contact with the puncturing roller 230, the bubble is punctured by the puncturing roller 230. As the film material 211 and the strip body 110 move, the puncturing roller 230 rotates. When the angle sensor detects that the angle of rotation of the puncturing roller 230 is large per unit time, it means that the number of bubbles in contact with the puncturing roller 230 per unit time is large. At this time, gas is injected into the air passage 352 through the air pump 351, and the air pressure in the adjustment chamber 354 increases, thereby causing the moving plate 353 to move away from the axis of the puncturing roller 230 radially. The elastic force of the spring 330 increases. Since the moving plate 353 cannot move due to the force of the gas, when the spring 330 releases its elastic force, it causes the blade 320 to move outward, thereby enhancing the scraping and exhaust intensity.

[0038] When the angle sensor detects that the licker roller 230 has not rotated within a unit time, it indicates that the coating effect is good and no air bubbles are generated. At this time, the gas injected into the air channel 352 can be reduced by the air pump 351, the air pressure in the adjustment chamber 354 can be reduced, and the moving plate 353 moves inward under the action of the spring 330, causing the blade 320 to move inward, reducing the friction between the blade 320 and the strip body 110, thereby reducing energy consumption and improving coating efficiency.

[0039] In a further embodiment, the coating mechanism 200 also includes a flattening roller 260 and a plurality of guide rollers 270; the flattening roller 260 is rotatably mounted on the frame 100 and located between the roll roller 210 and the exhaust roller 300, for flattening the film material 211; the plurality of guide rollers 270 are rotatably mounted on the frame 100 for guiding and adjusting the transmission path and tension of the film material 211.

[0040] In a further embodiment, the drive assembly 340 includes a drive wheel 341 and a driven wheel 342. The drive wheel 341 is synchronously rotatably connected to the flattening roller 260, and the driven wheel 342 is synchronously rotatably connected to the exhaust roller 300. The driven wheel 342 meshes with the drive wheel 341. When the film material 211 is released, the friction between the film material 211 and the flattening roller 260 causes the flattening roller 260 to rotate. When the flattening roller 260 rotates, it drives the drive wheel 341 to rotate synchronously, thereby driving the driven wheel 342 to rotate. The rotation direction of the driven wheel 342 is opposite to that of the drive wheel 341. When the driven wheel 342 rotates, it drives the roller body 310 to rotate. The drive assembly 340 utilizes the power generated by the film material 211 during the coating process, and can realize the active rotation of the exhaust roller 300 without the need for an additional drive motor. Moreover, the rotation speed of the exhaust roller 300 is automatically adjusted according to the coating speed, which can adapt to different production efficiencies.

[0041] In a further embodiment, a cooling mechanism is provided between the take-up roller 400 and the second heating roller 240; the cooling mechanism is used to cool the coated strip body 110.

[0042] The cooling mechanism includes multiple cooling rollers 500, which are spaced apart in the first direction and staggered in the vertical direction. The coated strip body 110 is wound around the multiple cooling rollers 500. By winding around each cooling roller 500, the coated strip body 110 increases the contact area and cooling time, ensuring rapid shaping of the coated layer and guaranteeing the coating quality.

[0043] In a further embodiment, a sealing gasket 321 is connected to the outer end of the blade 320. The sealing gasket 321 is made of a flexible and wear-resistant material and can maintain close contact with the surface of the strip body 110. This allows it to scrape away impurities from the surface of the strip body 110 during the rotation of the blade 320, prevent external contaminants from entering the coating area, optimize the coating effect, and avoid damaging the surface of the strip body 110.

[0044] Work process: During lamination, the strip body 110 is released from the unloading roller and conveyed horizontally along the first direction. Simultaneously, the upper and lower winding rollers 210 release the film material 211, with the adhesive layer of the film material 211 facing the strip body 110. The released film material 211 passes between the flattening roller 260 and the baffle 120. The friction between the film material 211 and the flattening roller 260 causes the flattening roller 260 to rotate. (Refer to...) Figure 4The flattening roller 260 located above the strip body 110 rotates counterclockwise. When the flattening roller 260 rotates, it drives the driving wheel 341 to rotate synchronously. The driving wheel 341 meshes with the driven wheel 342, thereby driving the driven wheel 342 to rotate. The roller body 310 rotates synchronously with the driven wheel 342. The roller body 310 located above the strip body 110 rotates clockwise, and the blades 320 on the roller body 310 rotate synchronously with the roller body 310.

[0045] In the initial state, at least one blade 320 is in contact with the baffle 120, and at least one blade 320 is in contact with the strip body 110; the blades 320, the film material 211, and the strip body 110 define an exhaust chamber 301; the blades 320 rotate synchronously with the roller body 310, and the blades 320 that abut against the baffle 120 are compressed, resulting in a shorter length extending out of the roller body 310. When the blades 320 rotate to a preset angle, they disengage from the baffle 120 and continue to rotate. The blades 320 are no longer subjected to the force of the baffle 120, and at this time, the blades 320 extend out of the roller body 310 under the action of the spring 330. After rotating at a preset angle, the blade 320 abuts against the strip body 110. The blade 320 is subjected to the force of the strip body 110, and the spring 330 is compressed and stored. The blade 320 moves inward along the radial direction of the roller 310. As the roller 310 continues to rotate, the blade 320 passes over the surface of the strip body 110. The sealing gasket 321 at its outer end scrapes away impurities from the surface of the strip body 110, preventing external contaminants from entering the coating area, optimizing the coating effect, and avoiding wear on the strip body 110. The gas in the exhaust chamber 301 is discharged with the rotation of the blade 320, and the gas between the strip body 110 and the film material 211 is reduced.

[0046] The heating element in the first heating roller 220 increases the temperature of the first heating roller 220. After the film material 211 passes through the baffle 120, when the upper and lower film materials 211 and the strip body 110 reach between the upper and lower first heating rollers 220, the temperature of the film material 211 rises after contact with the first heating roller 220, and the adhesive layer on it melts. The upper and lower film materials 211 are pressed together by the two first heating rollers 220 onto the upper and lower surfaces of the strip body 110 for film coating.

[0047] When the strip body 110, after its initial coating, passes between the upper and lower puncture rollers 230, the area without air bubbles can pass smoothly between the two puncture rollers 230 because the sum of the distance between the axis of the puncture roller 230 and the outer end of the spike and the thickness of the film 211 is equal to the distance between the axis of the puncture roller 230 and the end face of the strip body 110 facing the puncture roller 230. When the area with air bubbles reaches between the two puncture rollers 230, the air bubbles bulge towards the puncture roller 230 and are punctured by the spikes after contacting them, releasing the gas inside. As the film 211 and the strip body 110 move, the puncture rollers 230 rotate. Afterward, the strip body 110 and the upper and lower layers of film 211 reach between the two second heating rollers 240, where the second heating rollers 240 heat and press them a second time, so that the film 211 is smoothly attached to the strip body 110 and the puncture holes are sealed, thereby completely eliminating air bubbles and improving the flatness and bonding strength of the coated surface. At the same time, the pressure roller 250 applies downward pressure to the first heating roller 220 and the second heating roller 240 to solve the problem that the middle of the first heating roller 220 and the second heating roller 240 is curled up due to their excessive length, which affects the coating effect.

[0048] During the above process, when the angle sensor detects that the angle of rotation of the spiking roller 230 is large per unit time, it indicates that the number of bubbles in contact with the spiking roller 230 per unit time is large. At this time, gas is injected into the air passage 352 by the air pump 351, and the air pressure in the adjustment chamber 354 increases, thereby causing the moving plate 353 to move radially away from the axis of the spiking roller 230. The elastic force of the spring 330 increases. Since the moving plate 353 cannot move due to the force of the gas, when the spring 330 releases its elastic force, it causes the blade 320 to move outward, thereby enhancing the scraping and exhaust intensity.

[0049] When the angle sensor detects that the licker roller 230 has not rotated within a unit time, it indicates that the coating effect is good and no air bubbles are generated. At this time, the gas injected into the air channel 352 can be reduced by the air pump 351, the air pressure in the adjustment chamber 354 can be reduced, and the moving plate 353 moves inward under the action of the spring 330, causing the blade 320 to move inward, reducing the friction between the blade 320 and the strip body 110, thereby reducing energy consumption and improving coating efficiency.

[0050] The coated strip body 110 is cooled and shaped by multiple cooling rollers 500 and then wound up by take-up rollers 400.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A double-sided coating equipment for metal strips, characterized in that, include: A frame on which a feeding roller is rotatably mounted. The feeding roller is used to wind up the strip body, and the released strip body extends along a first direction. There are two laminating mechanisms, located on the upper and lower sides of the released strip body, respectively. Each laminating mechanism includes a winding roller and a first heating roller arranged sequentially along a first direction, both of which are rotatably mounted on the frame. The winding roller is used to wind up the film material, one side of which has an adhesive layer, with the adhesive layer of the released film material facing the strip body. The first heating roller has a heating element inside, used to heat the film material to melt the adhesive layer and press the film material onto the surface of the strip body. There are two exhaust rollers, located on the upper and lower sides of the strip body respectively, between the winding roller and the first heating roller. Each exhaust roller includes a roller body and multiple blades. The blades are evenly distributed circumferentially along the roller body and extend radially along the roller body, and are movably mounted radially on the roller body. A spring is installed between the roller body and the blades, causing the blades to tend to move outwards. A baffle is installed between the roller body and the film. Initially, at least one blade on the roller body is in contact with the strip body, and at least one blade is in sealed contact with the baffle. The side of the baffle away from the roller body is in sealed contact with the film. The exhaust roller is connected to a drive assembly for rotating the exhaust roller. The blades in contact with the baffle and the blades in contact with the strip body... The blades, film material, and strip body define the exhaust chamber. During the rotation of the roller, the blades rotate synchronously with the roller. The blades that abut against the baffle are compressed, and the length extending out of the roller is relatively short. When the blade rotates to a preset angle, the blade disengages from the baffle and continues to rotate. The blade is no longer subject to the force of the baffle. At this time, the blade extends out of the roller under the action of the spring. After the blade continues to rotate to a preset angle, it abuts against the strip body. The blade is subject to the force of the strip body, and the spring is compressed and stores energy. The blade moves inward along the radial direction of the roller. When the blade disengages from the strip body, the gas inside is discharged. As the roller continues to rotate, the blade passes over the surface of the strip body, cleaning its surface. The take-up roller is rotatably mounted on the frame and is used to take up the coated strip body.

2. The double-sided coating equipment for metal strips according to claim 1, characterized in that, The coating mechanism also includes a licker-in roller and a second heating roller. The licker-in roller is mounted on the frame and is located between the first heating roller and the take-up roller. The peripheral wall of the licker-in roller is provided with multiple spikes. The sum of the distance between the axis of the licker-in roller and the outer end of the spikes and the thickness of the film is equal to the distance between the axis of the licker-in roller and the end face of the strip body facing the licker-in roller. The second heating roller is rotatably mounted on the frame and is located between the licker-in roller and the take-up roller. The second heating roller is provided with a heating element inside, which is used to reheat the film and press the film onto the surface of the strip body.

3. The double-sided coating equipment for metal strips according to claim 2, characterized in that, A pressure-holding roller is mounted on the frame and moves up and down. The pressure-holding roller is located above the first heating roller and the second heating roller.

4. The double-sided coating equipment for metal strips according to claim 3, characterized in that, The licker roller is rotatably mounted on the frame. An angle sensor is installed at the end of the licker roller to record the rotation angle of the licker roller. An adjustment mechanism is installed inside the roller body to adjust the length of the blades extending out of the roller body according to the rotation angle of the licker roller per unit time.

5. The double-sided coating equipment for metal strips according to claim 4, characterized in that, The adjustment mechanism includes an air pump, an air passage, and multiple movable plates. Multiple mounting slots are evenly distributed circumferentially inside the roller body, and multiple movable plates are respectively installed radially in the multiple mounting slots. One end of the spring abuts against the movable plate, and the other end abuts against the blade. The movable plate is sealed to the mounting slot, and the inner surface of the movable plate and the mounting slot define the adjustment chamber. The air passage connects multiple adjustment chambers. The air pump is used to adjust the air pressure in the air passage according to the angle of rotation of the licker roller per unit time. The greater the rotation angle of the licker roller, the greater the pressure in the air passage.

6. The double-sided coating equipment for metal strips according to claim 2, characterized in that, The coating mechanism also includes a flattening roller and multiple guide rollers; the flattening roller is rotatably mounted on the frame and located between the roll roller and the exhaust roller, and is used to flatten the film material; the multiple guide rollers are rotatably mounted on the frame and are used to guide and adjust the transmission path and tension of the film material.

7. The double-sided coating equipment for metal strips according to claim 6, characterized in that, The drive assembly includes a drive wheel and a driven wheel. The drive wheel is synchronously connected to the flattening roller, and the driven wheel is synchronously connected to the exhaust roller. The driven wheel meshes with the drive wheel.

8. The double-sided coating equipment for metal strips according to claim 2, characterized in that, A cooling mechanism is provided between the take-up roller and the second heating roller; the cooling mechanism is used to cool the strip body after coating.

9. A double-sided coating equipment for metal strips according to claim 8, characterized in that, The cooling mechanism includes multiple cooling rollers, which are spaced apart in the first direction and staggered in the vertical direction. The coated strip body is wrapped around the multiple cooling rollers.

10. The double-sided coating equipment for metal strips according to claim 1, characterized in that, A sealing gasket is connected to the outer end of the blade.

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