Film flattening apparatus

Abstract

The application discloses a film flattening device and relates to the technical field of film coating production. The film flattening device comprises a rack, a circulating rotating supporting belt, two first adsorption boxes, a driving device and a negative pressure device. The supporting belt is provided with adsorption holes for supporting and adsorbing the film and synchronously conveying the film. The two first adsorption boxes are located in the supporting belt and have openings facing upwards and respectively move along two symmetrically inclined first paths arranged towards the front. The driving device drives the two adsorption boxes to synchronously move away from each other, and the speed difference of the two adsorption boxes in the front-back direction is consistent with the film conveying speed. At this time, the negative pressure device forms a negative pressure in the adsorption boxes, and the adsorption holes exert a transverse pulling force on the film from inside to outside to flatten the film. The film flattening device realizes efficient flattening through non-contact adsorption and flexible supporting, and avoids damage to the surface of the film caused by rigid contact.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to a film flattening device. Background Technology

[0002] Coating production lines are continuous precision processing lines for flexible roll-to-roll substrates such as films. They primarily involve continuous processes including unwinding, substrate pretreatment, coating, drying and curing, leveling, and rewinding to uniformly coat the surface of the film substrate with functional coating materials. These processes are widely used in optical films, lithium-ion battery separators, and electronic functional films. In the continuous production process of a coating line, the leveling process is a crucial intermediate step connecting coating, drying, and rewinding. It corrects the lateral deformation of the high-speed conveyed film substrate, eliminating deformation defects such as lateral wrinkles, longitudinal ripples, and edge warping caused by unwinding traction, coating forces, drying heat shrinkage, and uneven tension during roll-to-roll conveying. This ensures the film remains flat and under uniform tension throughout the entire process before entering subsequent processing stages. The effectiveness of this process directly determines the uniformity of coating thickness, the dimensional stability of the film, and the appearance quality of the finished product.

[0003] Currently, arched flattening rollers are commonly used to complete film flattening operations. The middle of the arched flattening roller body is arched and the two ends are flat. When the film is conveyed to the roller surface, it is continuously stretched to both sides to distribute the tension, thereby offsetting the transverse (i.e., the width direction) wrinkles of the film. Flattening rollers generally adopt a rigid contact extrusion flattening structure, that is, the film will continuously rub and extrude against the roller surface during high-speed conveying. For thin and soft films that have reduced toughness after high-temperature drying, the surface of the film has poor friction and extrusion resistance, and is very prone to surface scratches, whitening, and fuzzing, which greatly reduces the quality and production yield of the finished film and makes it difficult to meet the processing requirements of high-precision film coating. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a film flattening device that can achieve film flattening and smoothing while avoiding film surface damage, thus meeting the needs of high-quality film coating production and processing.

[0005] According to an embodiment of the present invention, a film flattening device includes a frame; a support belt rotatably connected to the frame, the support belt having a plurality of adsorption holes distributed thereon, the upper surface of the support belt being used to support the film, and the forward movement speed of the upper surface of the support belt being consistent with the film conveying speed when the support belt rotates cyclically; two first adsorption boxes disposed within the area enclosed by the support belt and with their openings facing upwards, each of the two first adsorption boxes having an inclined first path, the first path being a straight line, the two first paths being symmetrically arranged and the V-shaped opening formed by them facing forward; and a driving device disposed within the frame. On the frame, the driving device is used to drive the two first adsorption boxes to move closer or further away from each other synchronously along the corresponding first path, and when the two first adsorption boxes move away from each other, the velocity component of the two first adsorption boxes in the front-back direction is consistent with the film conveying speed; the negative pressure device is provided on the frame, and when the two first adsorption boxes move away from each other, the negative pressure device creates a negative pressure in the two first adsorption boxes, adsorbs the film attached to the upper surface of the support belt through the adsorption holes, and applies a pulling force to the film along the width direction of the film from the center area to the two side edges to flatten the film.

[0006] It has at least the following beneficial effects: During production, the film is conveyed at a constant speed from back to front. The forward movement speed of the upper surface of the rotating support belt is consistent with the film conveying speed, ensuring stable support of the film and preventing relative slippage between the film and the support belt that could cause film surface wear. Two first adsorption boxes located within the area enclosed by the support belt move symmetrically in an inclined, V-shaped, forward-facing straight path. Driven by the drive device, they reciprocate synchronously, moving closer to or further away from each other. This continuous reciprocating movement of the first adsorption boxes enables uninterrupted cyclic flattening of the continuously conveyed film. When the two first adsorption boxes move synchronously away from each other... When the negative pressure device is activated, it creates a negative pressure inside the two first adsorption boxes. The negative pressure airflow acts on the bottom surface of the film through the adsorption holes on the support belt, tightly adsorbing and adhering the film to the upper surface of the support belt. At the same time, the moving first adsorption box drives the film to generate a lateral tension from the inside out through the adsorption force, thereby stretching and unfolding the film and eliminating lateral wrinkles, longitudinal ripples and edge warping generated during film transportation, thus achieving film flattening. When the two first adsorption boxes approach each other synchronously, the negative pressure device stops drawing negative pressure, releases the adsorption on the film, and avoids stretching the film and causing deformation during the return movement. Compared to traditional rigid extrusion arch bridge flattening rollers, this film flattening equipment adopts a non-contact flattening method with negative pressure adsorption throughout the entire process. It relies on flexible lateral tension from the inside out to complete the film flattening, completely avoiding film surface damage caused by continuous friction and extrusion between the rigid roller and the film. At the same time, through the precise coordination of speed matching and intermittent negative pressure adsorption, it can continuously and stably correct various deformation defects of the film under high-speed continuous conveying conditions, ensuring that the film is flat and has uniform tension throughout the process. This effectively improves the uniformity of coating thickness, the dimensional stability of the film, and the appearance quality of the finished product, greatly increasing the yield of film coating production, and thus meeting the needs of high-quality film coating production and processing.

[0007] According to an embodiment of the film flattening device of the present invention, the frame is provided with two first ventilation devices, which are respectively arranged corresponding to two first adsorption boxes. Each of the two first adsorption boxes has a first ventilation hole on its side wall. When the two first adsorption boxes are far apart, the two first ventilation devices respectively block and seal the two first ventilation holes. When the two first adsorption boxes are close to each other, the two first ventilation devices respectively open the two first ventilation holes so that the inner cavity of the two first adsorption boxes can communicate with the outside through the first ventilation holes.

[0008] According to an embodiment of the film flattening device of the present invention, the first ventilation device includes a rotating component, a first top rod, and a second top rod. The middle part of the rotating component is rotatably connected to the outer wall of the first adsorption box. The first top rod and the second top rod are both disposed on the frame. The first top rod and the second top rod are respectively disposed at both ends of the first path. The first top rod is disposed outside the second top rod. When the first adsorption box moves from the inside to the outside, the lower end of the rotating component can strike the first top rod, causing the rotating component to rotate and opening the first ventilation hole at the upper end of the rotating component. When the first adsorption box moves from the outside to the inside, the lower end of the rotating component can strike the second top rod, causing the rotating component to rotate and blocking and sealing the first ventilation hole at the upper end of the rotating component.

[0009] According to an embodiment of the film flattening device of the present invention, the frame is provided with two first back pressure devices, which are respectively connected to two first adsorption boxes. When the two first adsorption boxes are close to each other, the two first back pressure devices respectively inject gas into the two first adsorption boxes.

[0010] According to an embodiment of the film flattening device of the present invention, the first back pressure device includes a piston-type air cylinder and a connecting mechanism. The piston-type air cylinder is disposed on the frame, and the length direction of the piston-type air cylinder is parallel to the first path. The piston rod in the piston-type air cylinder is connected to the first adsorption box. The cylinder body in the piston-type air cylinder is connected to the outside atmosphere and the first adsorption box through the connecting mechanism. When the first adsorption box moves from the inside to the outside, it pulls the piston rod, causing the cylinder body to draw in outside gas through the connecting mechanism. When the first adsorption box moves from the outside to the inside, it pushes the piston rod, causing the gas in the cylinder body to be injected into the first adsorption box through the connecting mechanism.

[0011] According to an embodiment of the thin film flattening device of the present invention, the communication mechanism includes a guide member, a first one-way valve, a second one-way valve, and an air pipe. The guide member has a transition cavity. The guide member is connected to the cylinder body. The cylinder body communicates with the transition cavity. The first one-way valve and the second one-way valve are both disposed on the guide member and communicate with the transition cavity. The first one-way valve is connected to the first adsorption box through the air pipe. The first one-way valve allows gas in the transition cavity to flow into the air pipe only through the first one-way valve. The second one-way valve allows external gas to flow into the transition cavity only through the second one-way valve. The air outlet of the air pipe is directly opposite the first vent hole.

[0012] According to an embodiment of the present invention, the film flattening device further includes two second adsorption boxes, which are disposed within the area enclosed by the supporting belt and have their openings facing upwards. The two second adsorption boxes are respectively disposed behind the two first adsorption boxes. Each of the two second adsorption boxes has an inclined second path, which is a straight line. The two second paths are symmetrically arranged and the V-shaped opening formed by them faces forward. The driving device can drive the two second adsorption boxes to move closer or further away from each other synchronously along the corresponding second paths. When the two second adsorption boxes move away from each other, the velocity component of the two second adsorption boxes in the front-back direction is consistent with the film conveying speed. When the two second adsorption boxes move away from each other, the negative pressure device can create a negative pressure inside the two second adsorption boxes.

[0013] According to an embodiment of the present invention, the first adsorption box and the second adsorption box are configured to alternately flatten the film.

[0014] According to an embodiment of the present invention, the film flattening device includes two first linear slides and two second linear slides. The two first linear slides and the two second linear slides are all disposed on the frame. The output ends of the two first linear slides are respectively connected to the two first adsorption boxes, and the output ends of the two second linear slides are respectively connected to the two second adsorption boxes.

[0015] According to an embodiment of the present invention, the film flattening device includes a negative pressure device comprising a negative pressure pump mechanism, a first pipeline assembly, a second pipeline assembly, and a pipeline switching assembly. The pipeline switching assembly enables the negative pressure pump mechanism to communicate with two first adsorption boxes through the first pipeline assembly, or enables the negative pressure pump mechanism to communicate with two second adsorption boxes through the second pipeline assembly.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of the film flattening device and the film according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a film flattening device; Figure 3 This is a schematic diagram of the internal structure of a film flattening device; Figure 4 This is a top view of the first adsorption box, the second adsorption box, and the driving device; Figure 5This is a structural schematic diagram of the first adsorption box, the first ventilation device, and the first linear slide. Figure 6 This is a schematic diagram of the structure with the first vent hole open at the upper end of the rotating component; Figure 7 This is a structural schematic diagram of the first adsorption box and the first back pressure device; Icon labels: First adsorption box 100; first vent 101; first ventilation device 110; rotating component 111; first push rod 112; second push rod 113; sealing gasket 114; first back pressure device 120; piston-type air cylinder 121; guide component 122; first one-way valve 123; second one-way valve 124; air pipe 125; piston rod 126; cylinder body 127; Second adsorption box 200; Second ventilation device 210; Support belt 300; suction hole 301; drive belt roller 310; rotary drive component 320; Drive unit 400; first linear slide 410; second linear slide 420; 500 racks; First path 10; Second path 20; Film 30. Detailed Implementation

[0018] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0019] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0020] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0021] refer to Figures 1 to 4This invention discloses a film flattening device, including a frame 500, a support belt 300, a drive device 400, a negative pressure device, and two first adsorption boxes 100. The support belt 300 is rotatably connected to the frame 500, and has multiple adsorption holes 301 distributed on it. The upper surface of the support belt 300 is used to support the film 30. When the support belt 300 rotates cyclically, the forward movement speed of the upper surface of the support belt 300 is consistent with the conveying speed of the film 30. The two first adsorption boxes 100 are located within the area enclosed by the support belt 300 and have upward-facing openings. Each of the two first adsorption boxes 100 has an inclined first path 10, which is a straight line. The two first paths 10 are symmetrically arranged, and the V-shaped opening formed by them faces forward. The drive device 400 is mounted on the frame 500 and drives... The device 400 is used to drive two first adsorption boxes 100 to move closer or further away from each other synchronously along the corresponding first path 10. When the two first adsorption boxes 100 move away from each other, the component speed of the two first adsorption boxes 100 in the front-back direction is consistent with the conveying speed of the film 30. The negative pressure device is set on the frame 500. When the two first adsorption boxes 100 move away from each other, the negative pressure device creates a negative pressure in the two first adsorption boxes 100. The film 30 adsorbs and adheres to the upper surface of the support belt 300 through the adsorption holes 301, and applies a pulling force to the film 30 along the width direction of the film 30 from the center area to the two side edges to flatten the film 30.

[0022] In this invention, "lateral" refers to the width direction of the film 30, i.e., the left-right direction; from the center area to the two side edges along the width direction of the film 30, i.e., from the inside out. The film flattening equipment also includes a rotary drive 320 and at least two drive rollers 310, which are parallel to the left-right direction and rotatably connected to the frame 500; the rotary drive 320, such as a motor, has its output end connected to one of the drive rollers 310; the support belt 300 is an annular belt, which is sleeved on two or more drive rollers 310, one of which is driven by the rotary drive 320, thereby enabling the support belt 300 to rotate cyclically. The upper surface of the support belt 300 is used to contact the film 30, so that the upper surface of the support belt 300 can support the film 30. By adjusting the output power of the rotary drive 320, the speed of the upper surface of the support belt 300 can be made the same as the conveying speed of the film 30, achieving relative slip-free conveying of the film 30.

[0023] The film flattening equipment of this invention is applied in a coating production line. The frame 500 has a reference plane, which is a vertical plane. During the forward conveying of the film 30, and with the combined action of the correction equipment, tensioning equipment, and other equipment in the coating production line, the film 30 is also symmetrical about the reference plane in the width direction. Two first adsorption boxes 100 are symmetrically arranged about the reference plane. The two first adsorption boxes 100 are located inside the annular area enclosed by the support belt 300, with their openings facing upwards and directly opposite the inner surface of the support belt 300. The first adsorption boxes 100 can only move in a straight line along a preset first path 10. The two first paths 10 are symmetrically arranged about the reference plane, forming a figure-eight layout. The drive device 400 is connected to the two first adsorption boxes 100 and can precisely control them to perform synchronous and opposite reciprocating movements along their respective first paths 10. The width of the adsorption holes 301 on the support belt 300 in the left-right direction is greater than the width of the film 30.

[0024] It should be explained that this film flattening equipment is designed to flatten films 30 transported from back to front. The defined inside and outside directions refer to the transverse direction of the film 30. The inside is the central region between the symmetrical centers of the two first adsorption boxes 100, and the outside is the region on both sides near the left and right edges of the film 30. The direction from the inside to the outside, i.e., from the transverse center of the film 30 to the two side edges of the film 30, is also the direction in which the flattening tension is applied. Specifically, when the two first adsorption boxes 100 move away from each other, the first adsorption boxes 100 move from the inside to the outside; when the two first adsorption boxes 100 move closer to each other, the first adsorption boxes 100 move from the outside to the inside. The two first adsorption boxes 100 remain symmetrical about the reference plane throughout the movement.

[0025] Understandably, during the production process, the film 30 is conveyed at a uniform speed from back to front. The forward movement speed of the upper surface of the circulating support belt 300 is consistent with the conveying speed of the film 30, which can always stably support the film 30 and avoid relative sliding between the film 30 and the support belt 300, thus preventing film surface wear. The two first adsorption boxes 100 located within the area enclosed by the support belt 300 move along a symmetrically inclined, straight first path 10 with a V-shaped opening facing forward. Driven by the drive device 400, they perform synchronous reciprocating movements that move closer or further apart from each other. Relying on the continuous reciprocating movement of the first adsorption boxes 100, the continuous circulating flattening operation of the continuously conveyed film 30 is achieved. When the two first adsorption boxes 100 move synchronously... When the two first adsorption boxes 100 move away from each other, the negative pressure device is activated, creating a negative pressure inside the two first adsorption boxes 100. The negative pressure airflow acts on the bottom surface of the film 30 through the adsorption holes 301 on the support belt 300, tightly adsorbing and adhering the film 30 to the upper surface of the support belt 300. At the same time, the moving first adsorption box 100 drives the film 30 to generate a lateral tension from the inside out through the adsorption force, thereby stretching and unfolding the film 30, eliminating lateral wrinkles, longitudinal ripples and edge warping generated during the transport of the film 30, and realizing the flattening of the film 30. When the two first adsorption boxes 100 move closer to each other synchronously, the negative pressure device stops drawing negative pressure, releasing the adsorption on the film 30, and avoiding deformation caused by pulling the film 30 during the return movement.

[0026] During the process of the two first adsorption boxes 100 moving away from each other, the film 30 is adsorbed in a localized area throughout. The velocity component of the first adsorption box 100 in the front-to-back direction matches the conveying speed of the film 30, ensuring that the film 30, the first adsorption box 100, and the supporting belt 300 are completely stationary relative to each other in the front-to-back conveying direction during the adsorption and flattening stage. This completely eliminates relative friction and pulling in the front-to-back direction, avoiding scratches, whitening, and fuzzing of the film surface, and ensuring stable conveying tension of the film 30, preventing the film 30 from shifting or stretching during the flattening process. The negative pressure device only applies negative pressure when the two first adsorption boxes 100 are moving away from each other and does not apply negative pressure when they are moving closer together. The phase when they are moving away from each other is the effective working stroke for flattening the film 30, which requires negative pressure adsorption to fix the film 30 and lateral movement to achieve flattening. The phase when they are moving closer together is the return stroke, which does not require flattening. If negative pressure is continuously applied to adsorb the film 30, the adsorption box moving back will pull the film 30 in the opposite direction, causing the flattened film 30 to wrinkle, loosen, or stretch again, thus destroying the flattening effect.

[0027] Compared to traditional rigid extrusion arch bridge flattening rollers, this film flattening equipment adopts a non-contact flattening method with negative pressure adsorption throughout the entire process. It relies on flexible lateral tension from the inside out to complete the flattening of the film 30, completely avoiding the film surface damage caused by continuous friction and extrusion between the rigid roller and the film 30. At the same time, through the precise coordination of speed matching and intermittent negative pressure adsorption, it can continuously and stably correct various deformation defects of the film 30 under high-speed continuous conveying conditions, ensuring that the film 30 is flat and has uniform tension throughout the process. This effectively improves the uniformity of coating thickness, the dimensional stability of the film 30, and the appearance quality of the finished product, greatly improving the yield of film 30 coating production, and thus meeting the needs of high-quality film 30 coating production and processing.

[0028] A very small gap is left between the opening end on the upper side of the first adsorption box 100 and the inner surface of the support belt 300. This ensures that the negative pressure airflow can pass vertically through the adsorption hole 301 and act on the bottom surface of the film 30, while avoiding friction between the first adsorption box 100 and the inner surface of the support belt 300.

[0029] This invention provides two preferred embodiments. The above is the first embodiment without a lifting structure. As another embodiment of this invention, the opening end on the upper side of the first adsorption box 100 is kept in contact with the inner surface of the support belt 300 to ensure no airflow leakage. The film flattening device is also provided with two lifting support assemblies. The two lifting support assemblies are respectively assembled at the bottom of the two first adsorption boxes 100, and both lifting support assemblies are connected to the output end of the driving device 400. The driving device 400 drives the first adsorption box 100 to move by driving the lifting support assemblies to move. Here, only one set of lifting support assemblies is described.

[0030] The lifting support assembly can drive the first adsorption box 100 to move up and down vertically. When the driving device 400 drives the first adsorption box 100 to move outward along the first path 10, the lifting support assembly drives the first adsorption box 100 to lift so that the open end of the upper side of the first adsorption box 100 fits against the inner surface of the support belt 300, sealing the airflow gap between the adsorption hole 301 and the inner cavity of the first adsorption box 100, preventing negative pressure airflow from leaking out from the gap between the two and causing pressure loss and adsorption loss. The surface of the open end of the upper side of the first adsorption box 100 is coated with a smooth polytetrafluoroethylene coating, and the forward and backward speed of the first adsorption box 100 is completely synchronized with the conveying speed of the support belt 300 throughout the outward movement. There is no relative slippage between the two in the conveying direction, only a very small amount of lateral slippage. The smooth coating can greatly reduce the contact friction resistance and avoid wear on the support belt 300 and the first adsorption box 100. When the drive device 400 moves the first adsorption box 100 inward to reset, the lifting support assembly simultaneously drives the first adsorption box 100 to descend vertically, creating a gap between the upper opening of the first adsorption box 100 and the inner surface of the support belt 300, completely disengaging them and preventing the first adsorption box 100 from continuously rubbing against the support belt 300 during the return movement. Once the first adsorption box 100 has moved inward to the inner end of the first path 10 and completed its reset, the lifting support assembly again drives the first adsorption box 100 to rise and reset, with its top re-attaching to the inner surface of the support belt 300, preparing for the sealing negative pressure for the next round of outward flattening operation. The lifting support assembly can be a common linear electric actuator. The cylinder of the linear electric actuator is connected to the output end of the drive device 400, and the piston rod 126 of the linear electric actuator is connected to the bottom of the first adsorption box 100; details will not be elaborated here.

[0031] refer to Figure 3 and Figure 4 The frame 500 is provided with two first ventilation devices 110, which are respectively arranged corresponding to two first adsorption boxes 100. Each of the two first adsorption boxes 100 has a first ventilation hole 101 on its side wall. When the two first adsorption boxes 100 are far apart, the two first ventilation devices 110 respectively block and seal the two first ventilation holes 101. When the two first adsorption boxes 100 are close to each other, the two first ventilation devices 110 respectively open the two first ventilation holes 101 so that the inner cavity of the two first adsorption boxes 100 can communicate with the outside through the first ventilation hole 101.

[0032] Understandably, when the drive device 400 drives the two first adsorption boxes 100 to move away from each other synchronously and perform the effective stroke stage of flattening the film 30, the two first ventilation devices 110 can correspondingly block and seal their respective matching first ventilation holes 101, so that the inner cavity of the first adsorption box 100 forms a sealed cavity. With the negative pressure operation of the negative pressure device, a stable and high-intensity negative pressure adsorption air pressure can be quickly formed inside the first adsorption box 100, ensuring that the adsorption holes 301 of the support belt 300 have sufficient and uniform adsorption force, reliably adhering to and fixing the film 30 and stably outputting the lateral tensile force from the inside to the outside, ensuring that the film 30 flattening operation is carried out smoothly.

[0033] When the two first adsorption boxes 100 move closer to each other synchronously to perform the reset return action, the first ventilation device 110 releases the blocking and sealing state of the first ventilation hole 101 and fully opens the first ventilation hole 101, so that the inner cavity of the first adsorption box 100 can be directly connected to the outside atmosphere through the first ventilation hole 101. The negative pressure device only draws negative pressure when the first adsorption boxes 100 move away from each other and stops drawing negative pressure when they move closer to each other. After the negative pressure device stops drawing the first adsorption box 100, the inner cavity of the first adsorption box 100 is very likely to have residual negative pressure, forming a negative pressure retention phenomenon. It cannot release pressure quickly, which will cause the first adsorption box 100 to still adsorb and bind the film 30 during the reset return process, thereby pulling and disturbing the already flattened film 30, causing secondary wrinkles, displacement, tension disorder, or even local stretching deformation of the film 30, which damages the flattening quality. By using the adaptive structure of the first ventilation device 110 switching between blocking and sealing and opening the first ventilation hole 101 as the first adsorption box 100 moves, the linkage between the first adsorption box 100's working stroke for closed pressure building and its return stroke for rapid pressure release can be achieved, completely eliminating the problem of negative pressure retention. This ensures that negative pressure adsorption only acts on the effective flattening process, and the adsorption constraint of the film 30 is instantly released during the return stroke, ensuring the consistency of flattening in each cycle, further optimizing the flattening effect of the film 30, and adapting to the production requirements of high-precision continuous coating and flattening of the film 30.

[0034] refer to Figure 5 and Figure 6The first ventilation device 110 includes a rotating component 111, a first push rod 112, and a second push rod 113. The middle part of the rotating component 111 is rotatably connected to the outer wall of the first adsorption box 100. The first push rod 112 and the second push rod 113 are both mounted on the frame 500. The first push rod 112 and the second push rod 113 are respectively located at both ends of the first path 10. The first push rod 112 is located outside the second push rod 113. When the first adsorption box 100 moves from the inside to the outside, the lower end of the rotating component 111 can strike the first push rod 112, causing the rotating component 111 to rotate and opening the first ventilation hole 101 at the upper end of the rotating component 111. When the first adsorption box 100 moves from the outside to the inside, the lower end of the rotating component 111 can strike the second push rod 113, causing the rotating component 111 to rotate and blocking and sealing the first ventilation hole 101 at the upper end of the rotating component 111.

[0035] The rotating component 111 can be a lever or a rocker arm. The middle part of the rotating component 111 is hinged to the outer wall of the first adsorption box 100 via a pivot. The upper end of the rotating component 111 is used to block and seal or move away from the first vent 101, and the lower end of the rotating component 111 is the trigger end. The first push rod 112 is installed at the outer end of the first path 10, that is, the first push rod 112 is set outside the edge of the film 30. The second push rod 113 is installed at the inner starting point of the first path 10.

[0036] In the initial state, when the first adsorption box 100 is at the inner starting point, the upper end of the rotating member 111 blocks and seals the first vent 101. When the first adsorption box 100 begins to move from the inside to the outside and flatten, until it moves to the outer end near the first path 10, the lower end of the rotating member 111 will not contact the first push rod 112, and the upper end of the rotating member 111 continues to seal the first vent 101. When the first adsorption box 100 reaches the outer end and completes the transverse stretching process of the film 30, the first adsorption box 100 is located outside the edge of the film 30, and the lower end of the rotating member 111 will contact and impact the first push rod 112. This impact force causes the rotating member 111 to rotate around its central axis, and the upper end of the rotating member 111 moves away from the position of the first vent 101, opening the first vent 101. At this time, the inner cavity of the first adsorption box 100 is connected to the atmosphere.

[0037] When the first adsorption box 100 begins to move from the outside to the inside to reset, the rotating part 111 remains stationary, that is, the first vent 101 remains open; as the first adsorption box 100 approaches the inner end of the first path 10, the lower end of the rotating part 111 contacts and impacts the second top rod 113, and the rotating part 111 rotates in the opposite direction, so that the upper end of the rotating part 111 re-blocks and seals the first vent 101. Then, the negative pressure device draws negative pressure on the two first adsorption boxes 100; then the driving device 400 begins to drive the two first adsorption boxes 100 away from each other. During the process of the first adsorption box 100 moving from the inside to the outside, the rotating part 111 remains stationary, that is, the rotating part 111 maintains the blocking and sealing of the first vent 101.

[0038] The first ventilation device 110 also includes a hinge shaft, a sealing gasket 114, a damper, and a spring. The sealing gasket 114 is located at the upper end of the rotating member 111, and its diameter is larger than the diameter of the first ventilation hole 101. The rotating member 111 is hinged to the outer wall of the first adsorption box 100 via the hinge shaft, providing a stable rotation fulcrum for the rotating member 111. A spring is positioned between the end of the hinge shaft away from the first adsorption box 100 and the rotating member 111. The spring continuously applies a pressing force towards the first adsorption box 100 to the rotating member 111, ensuring that the sealing gasket 114 at the upper end of the rotating member 111 is always tightly fitted against the outer wall of the first adsorption box 100. The damper is set between the rotating part 111 and the outer wall of the first adsorption box 100. The damper is used to increase the frictional resistance at the hinge position between the rotating part 111 and the outer wall of the first adsorption box 100. After the rotating part 111 is deflected by the impact of the top rod, the damper can lock the current deflection posture of the rotating part 111 by frictional damping, so as to ensure that the sealing gasket 114 can stably maintain the fixed state of shielding and sealing or being completely open, and prevent the sealing gasket 114 from causing the first vent hole 101 to leak or fail due to micro-displacement, thus ensuring the stability of the negative pressure in the inner cavity of the first adsorption box 100.

[0039] When the first adsorption box 100 moves from the inside to the outer end point, and reaches the outer end point, the lower end of the rotating part 111 strikes the first push rod 112. The first push rod 112 applies a pushing force to the lower end of the rotating part 111, and the rotating part 111 rotates around the hinge axis against the spring clamping force and the damper friction force. The upper end of the rotating part 111, along with the sealing gasket 114, moves away from the first vent 101, and the first vent 101 is fully open. When the first adsorption box 100 moves from the outside to the inner starting point to reset, the lower end of the rotating part 111 strikes the first vent 101. The second push rod 113 pushes the lower end of the rotating part 111, causing the rotating part 111 to rotate in the opposite direction around the hinge axis. The sealing gasket 114 at the upper end of the rotating part 111 is pressed and adhered to the outside of the first vent 101, thus achieving the sealing of the sealing gasket 114 and the first vent 101. The size of the sealing gasket 114 is larger than the diameter of the first vent 101, which can completely block the hole, achieving the airtight isolation of the first vent 101 and ensuring that the inner cavity of the first adsorption box 100 can be sealed to form an effective negative pressure during the subsequent flattening stroke.

[0040] In this embodiment of the invention, the outer endpoints of the two first paths 10 are respectively located on the left and right sides of the film 30; when the first adsorption box 100 moves outward along the first path 10 to reach the outer endpoint, the two first adsorption boxes 100 are located on the left and right sides of the film 30, that is, the first adsorption box 100 is located outside the edge of the film 30. This arrangement allows the negative pressure adsorption area to extend to the edge of the film 30, applying sufficient lateral tensile force to the edge of the film 30, which can specifically correct edge warping and edge wrinkling defects of the film 30, avoiding the problem of insufficient edge stretching and residual wrinkles caused by only adsorbing the middle part of the film 30, completely covering the flattened area of ​​the film 30 from the center to the two side edges, ensuring that the entire width of the film 30 is subjected to uniform force and there are no local flattening blind spots.

[0041] The first push rod 112 is installed at the outer end of the first path 10, and the second push rod 113 is installed at the inner end of the first path 10. Only when the first adsorption box 100 moves outward to the outer end and is about to return to its original position will the lower end of the rotating part 111 contact the first push rod 112 to trigger rotation, thus opening the first vent 101. The position of the first push rod 112 ensures that the first vent 101 remains sealed throughout the complete lateral stretching stroke of the membrane 30, maintaining a stable negative pressure in the inner cavity. The membrane 30 is stretched and flattened entirely by adsorption force. The vent is opened to release pressure only after the flattening action is completely finished and the membrane is about to return to its original position. This prevents pressure release midway and weakens the adsorption force, ensuring the stability of the negative pressure throughout the entire flattening stroke.

[0042] It needs further explanation that, in actual production conditions, after the first adsorption box 100 moves outward to the outer end of the first path 10 and completes the flattening of the film 30, the drive device 400 immediately drives the two first adsorption boxes 100 to quickly return to their original positions inward, without any additional time for static pressure relief. However, the adsorption holes 301 on the support belt 300 have a small diameter and limited ventilation capacity. Relying solely on the adsorption holes 301 cannot achieve instantaneous ventilation and pressure relief, resulting in pressure relief lag and residual pressure retention. The negative pressure in the cavity cannot be eliminated in time when the first adsorption box 100 retracts. If the first ventilation device 110 is not installed, after the negative pressure device stops drawing negative pressure, a stable negative pressure will remain in the cavity during the return reset of the first adsorption box 100. This pressure will continue to adhere to and bind the film 30 through the adsorption holes 301. The inward-moving first adsorption box 100 will pull the flattened film 30 in the opposite direction, causing defects such as local wrinkles, stretching deformation, and uneven tension in the film 30, severely affecting the flattening accuracy and finished product quality. The first ventilation device 110 can quickly open the first ventilation hole 101 with a larger diameter at the moment the first adsorption box 100 enters the return stroke, greatly increasing the ventilation flow section, so that the inner cavity of the first adsorption box 100 can be instantly connected to the outside atmosphere, quickly eliminating the internal residual negative pressure and ensuring the stability of the equipment's continuous cyclic flattening operation.

[0043] refer to Figure 7 The frame 500 is equipped with two first back pressure devices 120, which are respectively connected to two first adsorption boxes 100. When the two first adsorption boxes 100 approach each other, the two first back pressure devices 120 inject gas into the two first adsorption boxes 100 respectively. During the inward reset phase of the first adsorption box 100, even if the first vent hole 101 is open to connect the inner cavity with the atmosphere, the depressurization speed relying on natural air convection still has an upper limit. Under high-speed continuous production conditions, a slight negative pressure is easily left in the inner cavity of the adsorption box. The slight negative pressure will still generate a slight adsorption pull on the film 30 through the adsorption hole 301, which can easily disturb the flat film 30 during the return movement. By additionally setting an independent first back pressure device 120, air is introduced into the inner cavity of the first adsorption box 100 during the inward repositioning process. This quickly neutralizes the residual negative pressure inside the first adsorption box 100, significantly accelerating the recovery of the air pressure inside the first adsorption box 100 to standard atmospheric pressure. This completely eliminates residual adsorption force and prevents the film 30 from being slightly adsorbed and stretched during the return phase, thus avoiding secondary wrinkles and tension fluctuations. On the other hand, the introduced air will not pass upward through the adsorption hole 301 to impact the film 30. The airflow is discharged outward through the open first vent hole 101, preventing any bloating or disturbance to the flattened film 30.

[0044] refer to Figure 7The first back pressure device 120 includes a piston-type air cylinder 121 and a connecting mechanism. The piston-type air cylinder 121 is mounted on the frame 500. The length direction of the piston-type air cylinder 121 is parallel to the first path 10. The piston rod 126 in the piston-type air cylinder 121 is connected to the first adsorption box 100. The cylinder 127 in the piston-type air cylinder 121 is connected to the outside atmosphere and the first adsorption box 100 through the connecting mechanism. When the first adsorption box 100 moves from the inside to the outside, it pulls the piston rod 126, causing the cylinder 127 to draw in outside gas through the connecting mechanism. When the first adsorption box 100 moves from the outside to the inside, it pushes the piston rod 126, causing the gas in the cylinder 127 to be injected into the first adsorption box 100 through the connecting mechanism. The connecting mechanism includes a guide 122, a first one-way valve 123, a second one-way valve 124, and an air pipe 125. The guide 122 has a transition chamber and is connected to the cylinder 127. The cylinder 127 is connected to the transition chamber. The first one-way valve 123 and the second one-way valve 124 are both located on the guide 122 and are connected to the transition chamber. The first one-way valve 123 is connected to the first adsorption box 100 through the air pipe 125. The first one-way valve 123 allows gas in the transition chamber to flow into the air pipe 125 through the first one-way valve 123. The second one-way valve 124 allows external gas to flow into the transition chamber through the second one-way valve 124.

[0045] The piston-type air cylinder 121 is a common closed cylindrical structure with a piston rod 126 internally sliding. The extension and retraction of the piston rod 126 can change the volume of the inner cavity of the cylinder 127. When the volume expands, it forms a negative pressure to draw in gas, and when the volume shrinks, it squeezes the internal gas outward. It can autonomously complete gas collection and release without the need for an external gas source.

[0046] When the first adsorption box 100 moves from the inside to the outside along the first path 10 to perform the flattening process, the first adsorption box 100 simultaneously pulls the piston rod 126 of the piston-type air cylinder 121 to slide outward, and the volume of the inner cavity of the cylinder 127 increases accordingly. A negative pressure is generated in the inner cavity of the cylinder 127 and the transition cavity in the conductor 122. Outside air pushes open the second one-way valve 124 and flows into the transition cavity, and the gas in the transition cavity flows into the cylinder 127 to complete the gas storage. At this time, the first one-way valve 123 is in the closed state, and the gas in the transition cavity cannot enter the first adsorption box 100, so it will not interfere with the negative pressure adsorption operation.

[0047] When the first adsorption box 100 moves from the outside to the inside along the first path 10 to return to its original position, the first adsorption box 100 pushes the piston rod 126 to retract, reducing the volume of the inner cavity of the cylinder 127 and compressing the internal air. This causes the air pressure in the inner cavity and transition cavity of the cylinder 127 to rise and open the first one-way valve 123. The gas stored in the cylinder 127 is then introduced into the first adsorption box 100 through the air pipe 125. At this time, the second one-way valve 124 closes to block the intake of external air. The first backpressure device 120 achieves automatic gas collection and backpressure gas supply by relying on the reciprocating movement of the first adsorption box 100 itself, reducing equipment energy consumption and manufacturing costs. The first one-way valve 123 and the second one-way valve 124 are both common spring-loaded check valves, which will not be described in detail here.

[0048] The air outlet of the trachea 125 is directly opposite the first vent 101. The airflow output from the trachea 125 can be directly directed to the first vent 101 and discharged in a directional manner. The airflow does not need to penetrate the adsorption holes 301 on the support belt 300, thus avoiding the airflow impacting the membrane 30 through the adsorption holes 301 and causing the membrane surface to shake. Furthermore, a gas distribution pipe 125 can be provided inside the first adsorption box 100. The gas distribution pipe 125 is connected to the air outlet of the air pipe 125, and the multiple air outlets on the gas distribution pipe 125 all face downward. The gas distribution pipe 125 is a multi-porous gas equalization pipe 125 arranged horizontally inside the first adsorption box 100. The hollow interior of the pipe forms an airflow distribution channel, which can evenly distribute the single-path air intake to multiple air outlets for output. The gas introduced from the air pipe 125 first flows into the gas distribution pipe 125, and after being dispersed by the gas distribution pipe 125, it is evenly sprayed out from the multiple sets of downward-facing air outlets. The airflow flows in a direction away from the support belt 300, completely eliminating the problem of the membrane 30 shaking caused by the airflow impacting the bottom surface of the membrane 30 upward. The multi-point dispersed air outlet can make the gas evenly fill the entire cavity of the first adsorption box 100, neutralize the residual negative pressure in all directions, avoid uneven local air pressure leading to incomplete pressure relief, and ensure a stable and smooth back pressure relief process.

[0049] refer to Figure 2 , Figure 3 and Figure 4 The film flattening device also includes two second adsorption boxes 200. The two second adsorption boxes 200 are located within the area enclosed by the support belt 300 and their openings face upwards. The two second adsorption boxes 200 are respectively located behind the two first adsorption boxes 100. The two second adsorption boxes 200 each have a second path 20 that is inclined and straight. The two second paths 20 are arranged symmetrically and the V-shaped opening formed by them faces forward. The driving device 400 can drive the two second adsorption boxes 200 to move closer or further away from each other synchronously along the corresponding second path 20. When the two second adsorption boxes 200 move away from each other, the velocity component of the two second adsorption boxes 200 in the front-back direction is consistent with the conveying speed of the film 30. When the two second adsorption boxes 200 move away from each other, the negative pressure device can create a negative pressure inside the two second adsorption boxes 200.

[0050] refer to Figure 4 Two second paths 20 are arranged parallel to two first paths 10, respectively. The two second paths 20 are symmetrical about a reference plane, and the length of the second path 20 is the same as the length of the first path 10. The two second adsorption boxes 200 are also symmetrical about the reference plane. Preferably, the angle between the first path 10, the second path 20 and the front-back direction is 45°, and the two first paths 10 are perpendicular to each other, and the two second paths 20 are perpendicular to each other.

[0051] The flattening process of the two second adsorption boxes 200 is similar to that of the first adsorption box 100, and will not be described again here. The additional second adsorption boxes 200 cooperate with the first adsorption box 100 to form two independent negative pressure adsorption and flattening stations in the conveying direction of the film 30. The dual flattening process can further reduce the probability of edge warping and local wrinkles of the film 30, adapting to high-precision coating processing scenarios of large-width films 30, and steadily improving the flatness of the film 30 and the consistency of coating thickness. The first adsorption box 100 and the second adsorption box 200 are configured to alternately flatten the film 30.

[0052] refer to Figure 4 The driving device 400 includes two first linear slides 410 and two second linear slides 420, all mounted on a frame 500. The output ends of the two first linear slides 410 are connected to two first adsorption boxes 100, and the output ends of the two second linear slides 420 are connected to two second adsorption boxes 200. The linear slides are common linear drive modules, capable of stably controlling the load to move uniformly along a preset linear trajectory. The displacement speed and stroke range can be precisely adjusted electrically, which will not be elaborated further here. The two first linear slides 410 are arranged parallel to the two first paths 10, respectively. Their output ends drive the first adsorption boxes 100 to synchronously move closer and further apart, flattening and resetting along the first paths 10. The output ends are connected to the first adsorption boxes 100, precisely controlling the lateral stretching stroke and forward and backward speed of the first adsorption boxes 100. Two second linear slides 420 are arranged in parallel to the two second paths 20, respectively. Their output ends drive the second adsorption boxes 200 to complete synchronous flattening and resetting actions along the second path 20, moving closer and further apart. The output ends are connected to the second adsorption boxes 200 to precisely control the lateral stretching stroke and front-back speed of the second adsorption boxes 200. The first linear slide 410 and the second linear slide 420 are controlled independently.

[0053] The negative pressure device is a common negative pressure air extraction unit, including a negative pressure pump mechanism, a first pipeline assembly, a second pipeline assembly, and a pipeline switching assembly. The pipeline switching assembly enables the negative pressure pump mechanism to connect to the two first adsorption boxes 100 through the first pipeline assembly, or to connect the negative pressure pump mechanism to the two second adsorption boxes 200 through the second pipeline assembly; details will not be elaborated here. The negative pressure pump mechanism continuously provides stable negative pressure suction power. The first pipeline assembly serves as an airflow channel between the negative pressure pump mechanism and the two first adsorption boxes 100, and the second pipeline assembly serves as an airflow connection between the negative pressure pump mechanism and the two second adsorption boxes 200. The pipeline switching assembly can automatically switch the pipeline on / off state based on the movement stroke of the first adsorption box 100 and the second adsorption box 200. The pipeline switching component has a first conducting state and a second conducting state. When the pipeline switching component is in the first conducting state, it connects the negative pressure pump mechanism and the first pipeline component, while simultaneously cutting off the passage of the second pipeline component. The negative pressure pump mechanism only draws negative pressure 100 on the two first adsorption boxes. When the pipeline switching component is in the second conducting state, it connects the negative pressure pump mechanism and the second pipeline component, while simultaneously cutting off the passage of the first pipeline component. The negative pressure pump mechanism only draws negative pressure 200 on the two second adsorption boxes.

[0054] The first pipeline assembly includes multiple negative pressure branch pipes. One end of each negative pressure branch pipe is connected to the negative pressure pump mechanism via a pipeline switching assembly, and the other end is connected to the inner cavity of each of the two first adsorption boxes 100. The second pipeline assembly also has multiple negative pressure branch pipes. One end of each negative pressure branch pipe is connected to the negative pressure pump mechanism via a pipeline switching assembly, and the other end is connected to the inner cavity of each of the two second adsorption boxes 200. This type of multi-branch negative pressure diversion pipeline structure is common in negative pressure adsorption conveying equipment and will not be described in detail. The pipeline switching assembly integrates two sets of independent on / off valve bodies, which are respectively connected to the main circuits of the first pipeline assembly and the second pipeline assembly. The valve body is electrically connected to the control module and can selectively open one set of negative pressure pipelines and simultaneously close the other set of negative pressure pipelines based on the slide stroke signal, realizing the automatic switching of the air supply object of the negative pressure pump mechanism. This type of pipeline switching assembly is also common and will not be described in detail.

[0055] In this embodiment of the invention, the film flattening device also includes two second ventilation devices 210 and two second back pressure devices. The side walls of the two second adsorption boxes 200 are provided with second ventilation holes. The structure, working principle and assembly logic of the second ventilation device 210 and the second back pressure device are completely consistent with the first ventilation device 110 and the first back pressure device 120 described above. They are respectively adapted to the two second adsorption boxes 200 to complete the sealing and pressure building of the station cavity, rapid pressure relief during return, and neutralization of residual negative pressure by the back pressure of the cavity. The supporting structure and linkage control method will not be described here.

[0056] In this invention, the film flattening device also includes a control module, which is electrically connected to the first linear slide 410, the second linear slide 420, the negative pressure pump mechanism, and the pipeline switching assembly. The flattening speed is defined as the synchronous moving speed of the two first adsorption boxes 100 and the two second adsorption boxes 200 moving away from each other, and the reset speed is defined as the synchronous moving speed of them moving closer to each other. The reset speed is greater than the flattening speed.

[0057] The flattening method of this film flattening equipment is roughly as follows: S1. The control module controls the negative pressure pump mechanism to maintain a constant open state. S2. The control module controls the two first linear slides 410 to drive the two first adsorption boxes 100 to move away from each other synchronously along the corresponding first path 10 at a flattening speed. At the same time, it controls the two second linear slides 420 to drive the two second adsorption boxes 200 to move closer to each other synchronously along the corresponding second path 20 at a reset speed. At this time, the control module controls the pipeline switching component to switch to the first conduction state. S3. When the two first adsorption boxes 100 move to the outer end of the first path 10, the control module controls the two first linear slides 410 to drive the two first adsorption boxes 100 to move closer to each other synchronously along the corresponding first path 10 at a reset speed. At the same time, the control module controls the two second linear slides 420 to drive the two second adsorption boxes 200 to move further away from each other synchronously along the corresponding second path 20 at a flattening speed. At this time, the control module controls the pipeline switching component to switch to the second conduction state. S4. Repeat steps S2 and S3 to ensure that the two first adsorption boxes 100 and the two second adsorption boxes 200 alternately perform flattening and resetting operations. In conjunction with the path switching of the pipeline switching component, uninterrupted alternating flattening operations are achieved during the continuous conveying of the film 30.

[0058] Understandably, when the equipment officially begins the 30-coating and flattening production of the film, the control module first controls the negative pressure pump mechanism to remain constantly running. In the initial stage of the equipment's cyclic operation, step S2 is executed. The control module synchronously regulates the differentiated operation of the first linear slide 410 and the second linear slide 420. The two sets of first linear slides 410 drive the two first adsorption boxes 100 at a low and stable flattening speed, moving away from each other along the symmetrical first path 10 to perform the lateral stretching and flattening operation of the film 30. At the same time, the two sets of second linear slides 420 drive the two second adsorption boxes 200 at a faster reset speed, moving closer to each other along the second path 20 to complete the rapid reset of the workstation. In this stage, the control module drives the pipeline switching component to switch to the first conduction state, separately conducting the negative pressure pump mechanism and the first pipeline component, providing negative pressure adsorption force only to the first adsorption box 100, so that the first adsorption box 100 adheres to the film 30 through negative pressure adsorption and applies lateral flattening tension, completing the precise flattening of a single section of film 30. The second adsorption box 200 is in a standby state without negative pressure reset.

[0059] When the first adsorption box 100 moves smoothly to the outer end of the first path 10 and completes the current stage of film 30 flattening operation, the equipment automatically switches to step S3. The control module switches the running status of the two sets of slides in real time, controls the first linear slide 410 to drive the first adsorption box 100 to retract and reset inward at a high speed, and controls the second linear slide 420 to drive the second adsorption box 200 to move away from each other along the second path 20 at a low speed flattening speed, and starts the secondary flattening operation. At the same time, the pipeline switching component switches to the second conduction state, cuts off the negative pressure passage of the first pipeline component, and connects the second pipeline component and the negative pressure pump mechanism separately, supplying negative pressure only to the second adsorption box 200, so that the second adsorption box 200 takes over from the first adsorption box 100 to adsorb, stretch and flatten the continuously conveyed film 30. The equipment continuously and alternately executes the process logic of steps S2 and S3, so that the first adsorption box 100 and the second adsorption box 200 always work alternately to flatten and reset. With the switching of the air passage, the equipment achieves uninterrupted and unstoppable alternating flattening processing of the film 30 under the condition of high-speed continuous uninterrupted conveying of the film 30.

[0060] On the other hand, the alternating standby and relay operation mode of the two sets of adsorption boxes solves the problem of no flattening process in the single station reset stage and the temporary lack of correction of film 30. It realizes seamless flattening and correction of film 30 throughout the entire transportation process, eliminates new wrinkles caused by station reset gaps, and ensures that film 30 remains flat throughout the entire transportation process after coating and drying. This improves the uniformity of coating thickness and the appearance quality of finished products, and significantly improves the yield of film coating production.

[0061] The control module is a general-purpose PLC programmable controller for industrial equipment, which integrates signal acquisition, logic operation and output drive functions, which will not be described in detail here.

[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A film flattening device for flattening films conveyed from back to front, characterized in that, include: frame; A support belt is rotatably connected to the frame. The support belt has multiple adsorption holes. The upper surface of the support belt is used to support the film. When the support belt rotates cyclically, the forward movement speed of the upper surface of the support belt is the same as the film conveying speed. Two first adsorption boxes are disposed within the area enclosed by the support belt and have their openings facing upwards. Each of the two first adsorption boxes has an inclined first path. The first path is a straight line. The two first paths are arranged symmetrically and the V-shaped opening formed by the two faces forward. A driving device is provided on the frame. The driving device is used to drive the two first adsorption boxes to move closer or further away from each other synchronously along the corresponding first path. When the two first adsorption boxes move away from each other, the component speed of the two first adsorption boxes in the front-back direction is consistent with the conveying speed of the film. A negative pressure device is installed on the frame. When the two first adsorption boxes are far apart, the negative pressure device creates a negative pressure in the two first adsorption boxes, adsorbs the film attached to the upper surface of the support belt through the adsorption holes, and applies a pulling force along the width direction of the film from the center area to the two side edges to flatten the film.

2. The film flattening equipment according to claim 1, characterized in that: The frame is equipped with two first ventilation devices, which are respectively arranged corresponding to two first adsorption boxes. Each of the two first adsorption boxes has a first ventilation hole on its side wall. When the two first adsorption boxes are far apart, the two first ventilation devices block and seal the two first ventilation holes respectively. When the two first adsorption boxes are close to each other, the two first ventilation devices open the two first ventilation holes respectively, so that the inner cavity of the two first adsorption boxes can communicate with the outside through the first ventilation holes.

3. The film flattening equipment according to claim 2, characterized in that: The first ventilation device includes a rotating component, a first push rod, and a second push rod. The middle part of the rotating component is rotatably connected to the outer wall of the first adsorption box. The first push rod and the second push rod are both mounted on the frame and are respectively located at both ends of the first path. The first push rod is located outside the second push rod. When the first adsorption box moves from the inside to the outside, the lower end of the rotating component can strike the first push rod, causing the rotating component to rotate and opening the first ventilation hole at the upper end of the rotating component. When the first adsorption box moves from the outside to the inside, the lower end of the rotating component can strike the second push rod, causing the rotating component to rotate and blocking and sealing the first ventilation hole at the upper end of the rotating component.

4. The film flattening equipment according to claim 2, characterized in that: The frame is equipped with two first back pressure devices, which are respectively connected to two first adsorption boxes. When the two first adsorption boxes are close to each other, the two first back pressure devices inject gas into the two first adsorption boxes respectively.

5. The film flattening equipment according to claim 4, characterized in that: The first back pressure device includes a piston-type air cylinder and a connecting mechanism. The piston-type air cylinder is mounted on the frame, and its length direction is parallel to the first path. The piston rod in the piston-type air cylinder is connected to the first adsorption box. The cylinder body in the piston-type air cylinder is connected to the outside atmosphere and the first adsorption box through the connecting mechanism. When the first adsorption box moves from the inside to the outside, it pulls the piston rod, causing the cylinder body to draw in outside gas through the connecting mechanism. When the first adsorption box moves from the outside to the inside, it pushes the piston rod, causing the gas inside the cylinder body to be injected into the first adsorption box through the connecting mechanism.

6. The film flattening equipment according to claim 5, characterized in that: The communication mechanism includes a guide, a first one-way valve, a second one-way valve, and an air pipe. The guide has a transition cavity and is connected to the cylinder. The cylinder communicates with the transition cavity. The first one-way valve and the second one-way valve are both located on the guide and communicate with the transition cavity. The first one-way valve communicates with the first adsorption box through the air pipe. The first one-way valve allows gas in the transition cavity to flow into the air pipe only. The second one-way valve allows external gas to flow into the transition cavity only. The air outlet of the air pipe is directly opposite the first vent hole.

7. The film flattening equipment according to claim 1, characterized in that: It also includes two second adsorption boxes, which are located within the area enclosed by the support belt and have their openings facing upwards. The two second adsorption boxes are respectively located behind the two first adsorption boxes. Each of the two second adsorption boxes has an inclined second path, which is a straight line. The two second paths are symmetrically arranged, and the V-shaped opening formed by them faces forward. The driving device can drive the two second adsorption boxes to move closer or further away from each other synchronously along the corresponding second paths. When the two second adsorption boxes move away from each other, the velocity component of the two second adsorption boxes in the front-back direction is consistent with the film conveying speed. When the two second adsorption boxes move away from each other, the negative pressure device can create a negative pressure inside the two second adsorption boxes.

8. The film flattening equipment according to claim 7, characterized in that: The first adsorption box and the second adsorption box are configured to alternately flatten the film.

9. The film flattening equipment according to claim 7, characterized in that: The driving device includes two first linear slides and two second linear slides, both of which are mounted on the frame. The output ends of the two first linear slides are respectively connected to the two first adsorption boxes, and the output ends of the two second linear slides are respectively connected to the two second adsorption boxes.

10. The film flattening device according to claim 7, characterized in that: The negative pressure device includes a negative pressure pump mechanism, a first pipeline assembly, a second pipeline assembly, and a pipeline switching assembly. The pipeline switching assembly enables the negative pressure pump mechanism to communicate with the two first adsorption boxes through the first pipeline assembly, or enables the negative pressure pump mechanism to communicate with the two second adsorption boxes through the second pipeline assembly.

Images