Polyimide film production line

Abstract

A polyimide film production line, comprising a steel belt casting machine (A), a peeling transition unit (B), a transverse stretching machine (C), an inspection unit (D), an annealing unit (E) and a winding unit (F) which are sequentially arranged, wherein a drying oven (1) of the steel belt casting machine (A) comprises a frame (11), outer thermally-insulating structures (5) arranged on two sides of the frame (11), and an upper air duct assembly (193) and a lower air duct assembly (194) which are arranged on the frame (11); the frame (11) comprises a bottom thermally-insulating layer (111), a middle-lower heat thermally-insulating layer (112), a middle-upper thermally-insulating layer (113) and a top thermally-insulating layer (114) which are sequentially spaced apart from each other from bottom to top and are parallel to each other; and the transverse stretching machine (C) comprises a transverse pulling box body (7) and a conveying system, and inner tracks (85) located in the transverse pulling box body (7) and outer tracks (86) located outside the transverse pulling box body (7) are provided between a driving sprocket assembly (82) and a driven sprocket assembly (81) of the conveying system. The polyimide film production line effectively reduces the total heating space in the drying box (1) and in the transverse pulling box body (7), the structure is more compact, and the heat loss during heat transfer is reduced, such that the energy consumption can be reduced, and the production cost is reduced.

Description

A polyimide film production line Technical Field

[0001] The present invention relates to the technical field of polyimide film production equipment, in particular to a polyimide film production line. Background Art

[0002] Polyimide film, also known as PI film, is the world's best-performing thin-film insulating material. It has excellent high and low temperature resistance, electrical insulation, adhesion, radiation resistance, and dielectric resistance. It is particularly suitable for use as a substrate for flexible printed circuit boards and various high-temperature resistant motor and electrical insulation materials.

[0003] Polyimide film is generally prepared by a solvent casting molding method, specifically, an extrusion die extrudes polyimide slurry onto the steel belt of a steel belt casting machine. The steel belt carries the polyimide slurry through a drying oven for drying and curing. The polyimide slurry is then transferred to a transverse stretching machine through a peeling transition mechanism for transverse stretching, and a heat source is used for imidization reaction. Finally, it is wound after annealing treatment.

[0004] However, existing conventional polyimide film production lines have the following disadvantages:

[0005] 1. In the production process of polyimide film, heat sources are required to achieve drying and imidization reaction, which consumes a lot of energy. Therefore, in order to achieve energy saving and reduce production costs, it is necessary to improve the production equipment to reduce heat energy loss.

[0006] 2. In order to extend the drying path, the steel belt will generally move in a waist-shaped path, that is, the steel belt is wound on the active drum structure and the driven drum structure, and the upper and lower straight sections of the steel belt are built into the drying box. The polyimide slurry follows the rotation of the steel belt to achieve secondary drying. The steel belt on the steel belt casting machine needs to be disassembled and maintained regularly, such as cleaning the steel belt and checking the damage of the steel belt so that it can be repaired or replaced in time to ensure the production quality of the polyimide film. The frame and outer insulation structure of the drying box prevent the steel belt from being disassembled from the front or back of the drying box. In addition, the drying box also includes an air duct structure set on the frame. If the air duct structure needs to be disassembled to facilitate the disassembly of the steel belt, then the air duct position needs to be reassembled and debugged later, which is very cumbersome and time-consuming. Therefore, it is necessary to design the steel belt casting machine based on the needs of steel belt disassembly and maintenance.

[0007] 3. The outer insulation structure of the drying box needs to be assembled by splicing insulation modules. Since the internal parts of the steel strip cast film machine need to be regularly maintained, replaced, cleaned, lubricated, and troubleshooted, it is necessary to design an inspection port for staff to enter the interior of the steel strip cast film machine. If an inspection port is set on the insulation outer body of the insulation module, the insulation inner body needs to be installed to fill the inspection port in the working state to reduce the heat transfer and loss to the outside through the inspection port. During maintenance, the insulation inner body is pulled out from the inspection port to open the inspection port for staff to enter. However, the insulation inner body is heavy and has a certain volume, so the friction between the insulation inner body and the insulation outer body is very large, which makes it very inconvenient for staff to pull out and put in the insulation inner body. It is not only time-consuming and labor-intensive, but also difficult to adjust the position of the insulation inner body.

[0008] 4. Due to the traction and manufacturing errors of the steel belt of the steel belt casting machine, the steel belt will deviate left and right during the transmission process, or even deviate from the track, which can easily lead to stress concentration on the steel belt, reduce the service life of the steel belt, and affect the connectivity and stability of production; in addition, due to the instability of the steel belt, it is difficult to ensure that the polyimide slurry is evenly distributed on the surface of the steel belt during the casting process, thereby affecting the thickness uniformity of the polyimide film and further affecting the quality of the polyimide film.

[0009] 5. The conveying system of the existing transverse stretching machine adjusts the distance between the two sprockets by setting a transverse adjustment mechanism. During the operation, the film needs to be heated by high temperature. However, the various components in the transverse stretching machine will expand when heated. For example, the track will stretch along its length after heating. The elongated track will squeeze the sprocket assembly, causing the sprocket assembly and the transverse adjustment mechanism to deform, seriously affecting the transverse stretching quality of the PI film.

[0010] 6. The secondary annealing device is an offline device used after the PI film is formed. Its purpose is to eliminate the internal stress of the film and improve the tensile strength of the film. The existing secondary annealing device uses electric heating tubes for heating. This method has low thermal efficiency and uneven temperature distribution, and cannot effectively eliminate the internal stress of the film. Summary of the Invention

[0011] In view of the above-mentioned deficiencies in the prior art, the main purpose of the present invention is to provide a polyimide film production line with good compactness and low heat loss, so as to at least partially solve the above-mentioned deficiencies.

[0012] In order to achieve the above object, the present invention adopts the following technical solutions:

[0013] A polyimide film production line comprises a steel strip casting machine, a stripping transition unit, a transverse stretching machine, a detection unit, an annealing unit and a winding unit arranged in sequence, wherein the steel strip casting machine comprises a drying box, an active drum mechanism arranged at one end of the drying box near the stripping transition unit, a passive drum mechanism arranged at the other end of the drying box, a waist-shaped steel strip pulled by the active drum mechanism and the passive drum mechanism, an extrusion die head arranged on the active drum mechanism and a lead-out roller arranged below the extrusion die head, the drying box comprises a frame, an outer heat-insulating structure arranged on both sides of the frame, an upper air duct assembly and a lower air duct assembly arranged on the frame, and a roller for aligning the upper air duct assembly and the lower air duct assembly. The invention relates to a hot air unit for providing hot air, and a first nitrogen generating assembly; the frame comprises a bottom insulation layer, a middle and lower insulation layer, a middle and upper insulation layer, and a top insulation layer, which are arranged in sequence and parallel to each other from bottom to top; an upper drying tunnel for the upper straight section of the steel strip to pass through is formed between the top insulation layer and the middle and upper insulation layer, a lower drying tunnel for the lower straight section of the steel strip to pass through is formed between the bottom insulation layer and the middle and lower insulation layer, and an overhead interval is formed between the middle and upper insulation layer and the middle and lower insulation layer; the first nitrogen generating assembly is used to transport nitrogen to the upper drying tunnel and the lower drying tunnel; the transverse stretching machine comprises a transverse stretching box, a conveying system, and a second nitrogen generating assembly, and the second nitrogen generating assembly is used to transport nitrogen to the transverse stretching box.

[0014] Furthermore, the middle and lower insulation layer and the middle and upper insulation layer are connected by multiple middle-layer support columns, and the bottom insulation layer and the middle and lower insulation layer are connected by lower support columns; the top insulation layer and the middle and upper insulation layer are connected by upper support columns; the side surfaces of some of the middle-layer support columns are fixed with beam lugs for cooperating with longitudinal beams; and multiple lifting rings are provided on the top surface of the top insulation layer.

[0015] Furthermore, the upper duct assembly is arranged at the bottom of the top insulation layer, and the down duct assembly is arranged at the top of the bottom insulation layer; the upper duct assembly is provided in plurality and is arranged at intervals therebetween, and an upper concave cavity is formed between adjacent upper duct assemblies, and each upper concave cavity is provided with a sealing plate hanger fixed on the bottom surface of the top insulation layer, and a flat upper guide sealing plate is provided on the sealing plate hanger; the down duct assembly is provided in plurality and is arranged at intervals therebetween, and a lower concave cavity is formed between adjacent down duct assemblies, and each lower concave cavity is provided with a sealing plate bracket fixed on the upper surface of the bottom insulation layer, and a flat lower guide sealing plate is provided on the sealing plate bracket.

[0016] Furthermore, the sealing plate hanger is connected to the middle and upper insulation layer screws through the first inner layer support; the sealing plate bracket is connected to the middle and lower insulation layer screws through the second inner layer support.

[0017] Furthermore, the outer insulation structure includes an upper insulation layer, a hollow layer and a lower insulation layer spliced ​​together from top to bottom, the upper insulation layer is used to seal the upper drying tunnel, the hollow layer is used to seal the overhead interval, and the lower insulation layer is used to seal the lower drying tunnel. The upper insulation layer and the lower insulation layer both include an inspection insulation module, an observation insulation module, and a splicing insulation module. The inspection insulation module and the observation insulation module can be directly spliced ​​left and right, and the two inspection insulation modules are spliced ​​together through the splicing insulation module.

[0018] Furthermore, the maintenance insulation module is in a "convex" shape when viewed from above, the observation insulation module is in an inverted "convex" shape when viewed from above, and the splicing insulation module is in an inverted "convex" shape when viewed from above.

[0019] Furthermore, the maintenance and insulation module includes an insulation outer body with an inspection port, an outer insulation door body for closing or opening the inspection port, and an insulation inner body arranged in the insulation outer body and used to fill the inspection port; the inspection port is a rectangular structure, a handle is provided on the front end surface of the insulation inner body, and a plurality of universal balls are provided on the outer wall surface of the insulation inner body.

[0020] Furthermore, the inspection port includes a first cavity, a second cavity and a third cavity arranged in sequence from the inside to the outside, the space of the first cavity is smaller than the space of the second cavity, so that a first transition step is formed between the first cavity and the second cavity, and the space of the second cavity is smaller than the space of the third cavity, so that a second transition step is formed between the second cavity and the third cavity; the outer insulation door body is arranged in the third cavity, and the insulation inner body is arranged in the second cavity.

[0021] Furthermore, the maintenance insulation module, observation insulation module and splicing insulation module are all provided with mounting holes, and the sides of the bottom insulation layer, the middle and lower insulation layer, the middle and upper insulation layer and the top insulation layer are provided with threaded holes corresponding to the mounting holes, and the long screws are connected to the threaded holes after passing through the mounting holes.

[0022] Furthermore, the passive drum mechanism includes a passive drum, two sockets rotatably connected to the shafts at both ends of the passive drum, a guide rail arranged under the socket, and screw lifters that are the same in number and one-to-one corresponding to the sockets. The lifter bodies of the two screw lifters are fixed by a mounting plate, the input shaft of each screw lifter is connected to the corresponding driving mechanism, and the output end of each screw lifter is connected to the side of the socket through a pressure sensing component; the guide rail extends along the casting direction and is connected to the socket through a slider, and the shaft sleeves at both ends of the passive drum have spherical roller bearings connected to the corresponding sockets.

[0023] Furthermore, the pressure sensing assembly includes a fixed block, a weighing sensor, and a connecting shaft connected in sequence, the fixed block is fixed on the socket, and the connecting shaft is connected to the output end of the screw lifter; the driving mechanism includes a reducer that is transmission-connected to the input end of the screw lifter, and the input shaft of the reducer is connected to the motor drive.

[0024] Furthermore, the input shaft of the reducer has dual input ends, one of the input shafts of the reducer is connected to the motor drive, and the other input shaft is connected to the handwheel.

[0025] Furthermore, the socket is provided with an oil pipeline for inputting lubricating oil to the spherical roller bearing, and the input end of the oil pipeline is connected to the oil cup; a cooling channel is provided in the passive drum, and a rotary joint is provided for connecting the end shaft of the passive drum to the cooling channel; a magnetostrictive displacement sensor is provided on the side of the guide rail, and the sensing end of the magnetostrictive displacement sensor is connected to the socket.

[0026] Furthermore, lower insulation pads are fixedly provided on the top surfaces of both ends of the bottom insulation layer, and each lower insulation pad is connected to the lower and middle insulation layers through lower support columns; upper insulation pads are provided on the bottom surfaces of both ends of the top insulation layer, and each upper insulation pad is connected to the upper and middle insulation layers through upper support columns.

[0027] Furthermore, the beam lug includes a reference mounting plate and a frame-shaped inserting plate, and one side surface of the inserting plate is welded to the reference mounting plate.

[0028] Furthermore, there are four beam insertion ears, two of which can be inserted by the same longitudinal beam, and the two beam insertion ears constitute a left lifting ear assembly, and the remaining two beam insertion ears can be inserted by the same longitudinal beam, and the two beam insertion ears constitute a right lifting ear assembly, and the left lifting ear assembly and the right lifting ear assembly are arranged symmetrically on the left and right.

[0029] Furthermore, a static pressure box insulation layer is provided on the middle and lower insulation layers, and casters are provided on the bottom surfaces of the middle and lower insulation layers.

[0030] Furthermore, one end of the middle and lower insulation layer and the middle and upper insulation layer are connected by a first mounting vertical plate, and the other end is connected by a second mounting vertical plate. The sides of the bottom insulation layer, the middle and lower insulation layer, the middle and upper insulation layer and the top insulation layer are provided with multiple mounting holes for installing the outer insulation structure.

[0031] Furthermore, the insulation outer body is provided with a plurality of mounting holes which pass through from front to back, and a long screw is inserted into each mounting hole, and the long screw is threadedly connected to the frame of the steel strip casting machine; insulation cotton is provided inside the insulation outer body, insulation inner body and outer insulation door body; one side of the outer insulation door body is connected to the insulation outer body by a hinge, and the other side is connected to the insulation outer body by a door lock.

[0032] Furthermore, the rear end face of the thermal insulation inner body presses against the first transition step to form a seal, and the second transition step is enclosed by a rectangular sealing strip; the thermal insulation inner body is fixedly connected to the inner wall of the thermal insulation outer body through a limiting lock.

[0033] Furthermore, a heating system is provided in the transverse pulling box body, and the transverse pulling box body is provided with an inlet end at one end close to the stripping transition unit, and an outlet end at the other end; the conveying system includes two symmetrically arranged traction mechanisms and amplitude modulation mechanisms, the traction mechanism includes a driven sprocket assembly arranged near the inlet end, a driving sprocket assembly arranged near the outlet end, and a chain sleeved on the driving sprocket assembly and the driven sprocket assembly, and a plurality of clamps for clamping the polyimide film are provided on the chain, and an inner track located in the transverse pulling box body and an outer track located outside the transverse pulling box body are provided between the driving sprocket assembly and the driven sprocket assembly, and a plurality of amplitude modulation mechanisms are provided in the transverse pulling box body at equal intervals, and the inner tracks on the two traction mechanisms are connected to the output end of the amplitude modulation mechanism to adjust the distance between the two inner tracks.

[0034] Furthermore, the transverse stretching machine further comprises a first protective cover symmetrically arranged on both sides of the transverse stretching box body, and the outer track is arranged in the first protective cover.

[0035] Furthermore, the driving sprocket assembly includes a first bracket, a first slide slidably provided on the first bracket, a first lateral translation mechanism provided on the first bracket and a first fixed seat provided on the first bracket, the first slide is rotatably connected to the first movable sprocket, a driving assembly for driving the first movable sprocket to rotate is provided between the first slide and the output end of the first lateral translation mechanism, and the first fixed seat is rotatably connected to the first fixed sprocket; one end of the inner track is provided on the first slide, and one end of the outer track is provided on the first bracket.

[0036] Furthermore, the driven sprocket assembly includes a second bracket, a transverse movable plate slidably provided on the second bracket, a second transverse translation mechanism provided on the second bracket, a longitudinal movable plate slidably provided on the transverse movable plate, a longitudinal translation mechanism provided on the longitudinal movable plate, a second slide provided at the output end of the longitudinal translation mechanism and a second fixed seat provided on the second bracket; the transverse movable plate is connected to the output end of the second transverse translation mechanism, and the translation direction of the longitudinal movable plate is perpendicular to the translation direction of the transverse movable plate; a second movable sprocket is rotatably connected to the second slide, and a second fixed sprocket is rotatably connected to the second fixed seat; the other end of the inner track is provided on the longitudinal movable plate, and the other end of the outer track is provided on the second bracket.

[0037] Furthermore, it also includes a follow-up guide mechanism, which includes a fixed frame rotatably connected to the second fixed seat, a movable frame rotatably connected to the second slide seat, and a docking track provided on the fixed frame. A telescopic component is provided between the docking track and the movable frame, and the docking track is always located on the tangent of the second fixed sprocket and the second movable sprocket.

[0038] Furthermore, the telescopic assembly includes a fixed block arranged on the movable frame, a guide rod with one end arranged on the fixed block, and a guide seat arranged on the docking track, and the guide rod is slidably connected to the guide seat.

[0039] Furthermore, the amplitude modulation mechanism includes an amplitude modulation track, a width adjustment device and a slide. The two ends of the amplitude modulation track are respectively connected to the two sides of the horizontal pull box. The two slides are slidably arranged on the amplitude modulation track. The output end of the width adjustment device is connected to the two slides so that the two slides can move toward or away from each other synchronously; an adjustment seat is provided on the top of each slide, and an adjustment slot is opened on the top of the adjustment seat, and the length extension direction of the adjustment slot is perpendicular to the translation direction of the slide. The adjustment slot is slidably connected to a positioning column, and the positioning column is connected to the inner track.

[0040] Furthermore, the inner track includes several track segments spliced ​​in sequence, and the positioning column is arranged at the connection position of two adjacent track segments; the adjustment groove is an inverted T-shaped groove, and the lower end of the positioning column is provided with a sliding part that is slidably connected to the adjustment groove; the middle part of the adjustment groove is provided with an insertion hole that matches the sliding part.

[0041] Furthermore, the heating system sequentially arranges a first heating zone, a second heating zone and a third heating zone along the conveying direction of the polyimide film, the temperature of the second heating zone is higher than that of the first heating zone and the third heating zone, and an exhaust mechanism is provided on the top of the first heating zone and the third heating zone.

[0042] Furthermore, the conveying system of the transverse stretching machine includes a sprocket mechanism arranged at the inlet end of the transverse stretching machine, the sprocket mechanism includes a mounting frame, a first translation mechanism and two sprocket assemblies that move toward or away from each other; the first translation mechanism is arranged on the mounting frame, and the sprocket assembly includes a transverse moving plate arranged at the output end of the first translation mechanism, a longitudinal moving plate slidably arranged on the transverse moving plate and a second translation mechanism arranged on the longitudinal moving plate; two parallel first guide rails are provided on the transverse moving plate, and a first slider slidably connected to the first guide rails is provided at the bottom of the longitudinal moving plate, and the translation direction of the longitudinal moving plate is perpendicular to the translation direction of the transverse moving plate; the second translation mechanism includes a slide seat slidably connected to the longitudinal moving plate, and the translation direction of the slide seat is parallel to the translation direction of the longitudinal moving plate; the slide seat is rotatably connected to the sprocket; the longitudinal moving plate is connected to the track.

[0043] Furthermore, the first translation mechanism includes two groups of third guide rails respectively arranged on the mounting frame, a drive motor arranged on the mounting frame and a screw rod rotatably connected to the mounting frame. The transverse moving plate on each sprocket assembly can be slidably arranged on the corresponding third guide rail. The drive motor drives the screw rod to rotate. The screw rod is provided with two sections of threads with opposite rotation directions. A screw rod nut engaged with the screw rod is provided at the bottom of each transverse moving plate.

[0044] Furthermore, the first translation mechanism further includes a displacement sensor provided on the mounting frame, and an extended end of the displacement sensor is connected to the transverse moving plate.

[0045] Furthermore, the first translation mechanism also includes a commutator, the output end of the drive motor is connected to the input end of the commutator, the output end of the commutator is connected to the lead screw, the input end of the commutator is also connected to a connecting rod, and a handwheel is provided at the end of the connecting rod.

[0046] Furthermore, the second translation mechanism also includes a second guide rail and a driving cylinder. Two parallel second guide rails are arranged on the longitudinal movable plate. A second slider is provided at the bottom of the slide seat, which is slidably connected to the second guide rail. The cylinder body of the driving cylinder is hinged to the longitudinal movable plate, and its extending rod is hinged to the slide seat.

[0047] Furthermore, two bearing seats are provided on the slide, and the two bearing seats are rotatably connected to the rotating shaft through bearings, and the sprocket is provided on the rotating shaft; an oil filling hole is provided in the rotating shaft, and a diversion hole connected to the oil filling hole is opened on the side wall of the rotating shaft, and the diversion hole is used to supply lubricating oil to the bearing; the slide is also provided with an upper oil pan located on the top of the sprocket and a lower oil pan located below the sprocket.

[0048] Furthermore, the polyimide film production line also includes a secondary annealing device arranged between the annealing unit and the winding unit, the secondary annealing device includes a first traction device, an annealing furnace, and a second traction device arranged in sequence along the conveying direction of the PI film, the annealing furnace includes several annealing modules arranged in parallel, the single annealing module includes a box body, a heating device arranged in the box body, an exhaust device arranged on the box body, and a third nitrogen generating assembly, one side of the box body is provided with an inlet end, and the other side thereof is provided with an outlet end, the heating device includes several far-infrared ceramic heating plates, and the third nitrogen generating assembly is used to transport nitrogen to the box body.

[0049] Furthermore, the box body includes an inner layer, an outer layer and thermal insulation cotton filled between the inner layer and the outer layer, and a support block for supporting the heating device is provided in the box body.

[0050] Furthermore, the heating device also includes a mounting frame arranged on the support block, the mounting frame includes a rectangular frame formed by splicing a plurality of angle irons, and a plurality of far-infrared ceramic heating plates are arranged on the top of the mounting frame and / or the bottom of the mounting frame.

[0051] Furthermore, the exhaust device includes a fan, a main pipe connected to the fan, and several branch pipes connected to the main pipe. The ends of the several branch pipes extend into the box and are respectively arranged close to the inlet end and the outlet end.

[0052] Furthermore, the inlet end and the outlet end are respectively provided with two baffles, which are symmetrically arranged up and down and can be slid up and down on the box body.

[0053] Furthermore, it also includes a corona machine arranged between the annealing furnace and the second traction device.

[0054] Furthermore, the first traction device includes a first frame, a first adjusting roller vertically slidably arranged on the frame, a first pressure roller vertically slidably arranged on the first frame, and a first driving motor arranged on the first frame. The first frame rotates in sequence along the conveying direction of the PI film and is connected with a first transition roller, a first tension detection roller, a second transition roller and a first traction roller. First tension sensors are respectively provided at both ends of the first tension detection roller. The first adjusting roller is arranged between the second transition roller and the first traction roller. The output end of the first driving motor is connected to the first traction roller. The first pressure roller and the first traction roller cooperate to convey the PI film.

[0055] Furthermore, the annealing furnace also includes two first clamping assemblies arranged symmetrically at the outlet end, the first clamping assembly includes a translation mechanism, an adjustment seat arranged at the output end of the translation mechanism, a lower clamping wheel rotatably connected to the adjustment seat, a first driving cylinder arranged on the adjustment seat and a connecting rod rotatably connected to the adjustment seat, one end of the connecting rod is hinged to the extension rod of the first driving cylinder, and the other end thereof is rotatably connected to the upper clamping wheel.

[0056] Furthermore, the second traction device includes a second frame, a second adjusting roller vertically slidably arranged on the second frame, a second pressure roller vertically slidably arranged on the second frame, a second driving motor arranged on the second frame and two second clamping assemblies symmetrically arranged on the second frame, the second frame rotates in sequence along the conveying direction of the PI film and is connected to the third transition roller, the second tension detection roller, the fourth transition roller and the second traction roller, the two ends of the second tension detection roller are respectively provided with a second tension sensor, the second adjusting roller is arranged between the fourth transition roller and the second traction roller, the output end of the second driving motor is connected to the second traction roller, the second pressure roller and the second traction roller cooperate to convey the PI film, and the two second clamping assemblies are arranged on the downstream side of the second traction roller.

[0057] The beneficial effects of the present invention are as follows:

[0058] 1. Compared with the prior art, the polyimide film production line provided by the present invention provides an overhead section inside the drying box to separate the interior of the drying box into an upper drying tunnel and a lower drying tunnel, so that there is no need to heat the overhead section during operation; and the outer track in the traction system is provided outside the horizontal pull box to reduce the structure of the horizontal pull box, effectively reducing the total heating space inside the drying box and the horizontal pull box, making the structure more compact and reducing heat loss due to heat transfer, thereby reducing energy consumption and production costs.

[0059] 2. Compared with the prior art, the drying box of the steel strip casting machine of the polyimide film production line provided by the present invention fully takes into account the needs of disassembly and assembly of the steel strip in the later stage, and satisfies the disassembly and assembly of the steel strip with minimal disassembly and assembly workload. The frame of the drying box is cleverly provided with lifting rings and beam lifting ears, which can quickly and pre-maintain the positions of the middle and lower insulation layer, the middle and upper insulation layer and the top insulation layer before disassembling the steel strip. Even if the lower supporting column and the upper supporting column are removed to remove the obstruction to the steel strip, the positions of the middle and lower insulation layer, the middle and upper insulation layer and the top insulation layer will not change, thereby ensuring that the steel strip can be quickly disassembled and assembled, thereby improving work efficiency. At the same time, the frame of the drying box has a small amount of disassembly and assembly changes, which is convenient for later recovery.

[0060] 3. The maintenance insulation module of the steel strip casting machine in the polyimide film production line provided by the present invention provides an inspection port on the insulation outer body and a closable outer insulation door, so that staff can easily enter the interior to replace, clean, lubricate and troubleshoot parts, thereby simplifying the maintenance process. When maintenance is not required, the insulation inner body is filled in the inspection port to reduce heat transfer from the inspection port to the outside and reduce energy waste. Since a handle is provided on the front end surface of the insulation inner body and a plurality of universal balls are provided on the outer wall surface, it becomes easier to extract and insert the insulation inner body, which reduces the workload of the operator and improves work efficiency.

[0061] 4. Compared with the prior art, the passive drum deflection correction structure in the polyimide film production line provided by the present invention automatically determines the offset of the steel strip based on changes in tension sensed by a pressure sensing component. This structure then coordinates with the drive mechanism and screw lifter to dynamically correct the steel strip, ensuring that the steel strip is always centered, thus increasing its service life. It also ensures that the polyimide slurry is evenly distributed across the steel strip surface during the casting process, thereby ensuring consistent thickness uniformity of the polyimide film and improving the product quality of the polyimide film. Furthermore, the ingenious use of the self-aligning properties of the spherical roller bearing simplifies deflection correction. Under the action of the deflection correction force, the passive drum can flexibly change its axial position to adapt to different deflection correction situations, while also providing a certain degree of fault tolerance for passive drum installation.

[0062] 5. The transverse stretching machine in the polyimide film production line provided by the present invention comprises a driven sprocket assembly disposed at the inlet end of a box, a driving sprocket assembly disposed at the outlet end of the box, and multiple amplitude modulation mechanisms disposed at equal intervals within the box. Furthermore, an inner track located within the box and an outer track located outside the box are disposed between the driving sprocket assembly and the driven sprocket assembly, and the amplitude modulation mechanisms are capable of adjusting the spacing between the two inner tracks. A chain circulates around the driving sprocket assembly, the outer track, the driven sprocket assembly, and the inner track. At the inlet end, multiple clamps secure both sides of the PI film and, under the traction of the inner track, continuously transversely stretch the PI film. Since the outer track is disposed outside the box, the number of components within the box can be reduced, thereby reducing the size of the box, making the box structure more compact and reducing energy consumption.

[0063] 6. The sprocket mechanism in the polyimide film production line provided by the present invention adjusts the distance between the two sprocket assemblies by setting a first translation mechanism to be suitable for stretching PI films of different widths; and adjusts the installation position of the sprocket on each sprocket assembly by setting a second translation mechanism to adjust the tension of the chain to ensure that the PI film can be smoothly pulled forward for transportation; in addition, a first guide rail is set on the transverse moving plate, and the longitudinal moving plate can be slidably set on the first guide rail. When the rail is deformed by heat, it pushes the longitudinal moving plate to move a corresponding distance along the first guide rail to avoid the sprocket assembly and the first translation mechanism from being squeezed by the rail and deformed, thereby ensuring the transverse stretching quality of the PI film.

[0064] 7. The secondary annealing device in the polyimide film production line provided by the present invention is sequentially provided with a first traction device, an annealing furnace, and a second traction device. The PI film passes through the annealing furnace under the traction of the first traction device and the second traction device, and is finally wound up by the winding unit; a plurality of far-infrared ceramic heating plates are arranged in the annealing furnace to heat the PI film. The heating efficiency is high and the temperature distribution in the box is uniform, which can well eliminate the internal stress of the PI film and improve the tensile strength of the PI film. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] FIG1 is a front view of a first embodiment of a polyimide film production line provided by the present invention, wherein the solid arrow in the figure indicates the conveying direction of the polyimide film.

[0066] FIG2 is a structural diagram of a transverse stretching machine in the first embodiment provided by the present invention.

[0067] FIG3 is a front view of the transverse stretching machine in the first embodiment provided by the present invention.

[0068] FIG4 is a structural diagram of the conveying system in the first embodiment provided by the present invention.

[0069] FIG5 is a side view of the driving sprocket assembly in the first embodiment provided by the present invention.

[0070] FIG6 is a structural diagram of a driven sprocket assembly according to a first embodiment of the present invention.

[0071] FIG7 is a schematic diagram of the installation of the follower guide mechanism and the driven sprocket assembly in the first embodiment provided by the present invention.

[0072] FIG8 is a schematic diagram of the adjustment principle of the follower guide mechanism in the first embodiment provided by the present invention.

[0073] FIG9 is a schematic diagram of the coordination structure of the chain and the guide rail in the first embodiment provided by the present invention.

[0074] FIG10 is a structural diagram of the amplitude modulation mechanism in the first embodiment provided by the present invention.

[0075] FIG11 is an enlarged view of point M in FIG10 .

[0076] FIG12 is a cross-sectional view of the slide in the first embodiment provided by the present invention.

[0077] FIG13 is a schematic diagram of the coordination structure of the chain and the inner rail in the first embodiment provided by the present invention.

[0078] FIG14 is a schematic structural diagram of a steel belt casting machine in the second embodiment of the polyimide film production line provided by the present invention, wherein the solid arrows in the figure indicate the casting direction of the polyimide film.

[0079] FIG15 is a first perspective view of a frame of a drying box in a second embodiment of the present invention.

[0080] FIG16 is a second perspective view of the frame of the drying box in the second embodiment provided by the present invention.

[0081] FIG17 is a front view of a frame of a drying box in a second embodiment provided by the present invention.

[0082] FIG18 is a schematic structural diagram of the cooperation between the steel belt and the frame in the second embodiment provided by the present invention, in which the solid arrow indicates the movement direction of the steel belt.

[0083] FIG19 is a three-dimensional diagram of the outer heat insulation structure in the second embodiment provided by the present invention.

[0084] FIG20 is a three-dimensional diagram of the maintenance insulation module in the second embodiment provided by the present invention.

[0085] FIG21 is a front view of the maintenance insulation module in the second embodiment provided by the present invention.

[0086] FIG22 is a cross-sectional view taken along line AA in FIG21 .

[0087] FIG23 is a perspective schematic diagram of the second embodiment of the present invention wherein the heat-insulating inner body is removed from the maintenance heat-insulating module.

[0088] FIG24 is a three-dimensional diagram of the passive drum mechanism in the second embodiment provided by the present invention.

[0089] FIG25 is a schematic structural diagram of the second embodiment of the present invention in which the end shaft of the passive drum is connected to the sliding receiving seat through a spherical roller bearing.

[0090] FIG26 is a left side view of the passive drum mechanism in the second embodiment provided by the present invention.

[0091] FIG27 is a structural diagram of the sprocket mechanism of the transverse stretching machine in the third embodiment of the polyimide film production line provided by the present invention.

[0092] FIG28 is a structural diagram of the sprocket mechanism of the transverse stretching machine in the third embodiment provided by the present invention.

[0093] FIG29 is a bottom view of the sprocket mechanism of the transverse stretching machine in the third embodiment provided by the present invention.

[0094] 30 is a side view of the sprocket assembly in the sprocket mechanism of the transverse stretching machine in the third embodiment provided by the present invention.

[0095] FIG31 is a cross-sectional view taken along line EE of FIG30 .

[0096] FIG32 is a front view of a secondary annealing device in the fourth embodiment of the polyimide film production line provided by the present invention.

[0097] FIG33 is a top view of the secondary annealing device in the fourth embodiment provided by the present invention.

[0098] FIG34 is a structural diagram of a secondary annealing device in a fourth embodiment provided by the present invention.

[0099] Figure 35 is an enlarged view of point E in Figure 34.

[0100] FIG36 is an enlarged view of point F in FIG34 .

[0101] FIG37 is a partial structural diagram of a secondary annealing device in a fourth embodiment provided by the present invention.

[0102] FIG38 is a structural diagram of the annealing furnace in the secondary annealing device in the fourth embodiment provided by the present invention.

[0103] FIG39 is a main cross-sectional view of the annealing furnace in the secondary annealing device in the fourth embodiment provided by the present invention.

[0104] Explanation of the accompanying drawings: First embodiment: steel strip casting machine A, stripping transition unit B; transverse stretching machine C: transverse stretching box 7, inlet end 71, outlet end 72, first protective cover 73, L-shaped bracket 74, second protective cover 75, traction mechanism 8, driven sprocket assembly 81, second bracket 811, transverse movable plate 812, second transverse translation mechanism 813, longitudinal movable plate 814, longitudinal translation mechanism 815, second slide 816, second fixed seat 817, second movable sprocket 818, second fixed sprocket 819, driving sprocket assembly 82, first bracket 821, first slide 822, first transverse translation mechanism 823, first fixed seat 824, first movable sprocket 825, driving assembly 826, first fixed sprocket 827, chain 83, clamp 8 4, inner track 85, track segment 851, guide portion 852, outer track 86, follow-up guide mechanism 87, fixed frame 871, movable frame 872, docking track 873, telescopic assembly 874, fixed block 8741, guide rod 8742, guide seat 8743, amplitude modulation mechanism 9, amplitude modulation track 91, width adjustment device 92, drive motor 921, width adjustment screw rod 922, slide 93, side plate 931, connecting plate 932, roller 933, adjustment seat 94, adjustment slot 941, insertion hole 942, lubricating oil groove 943, positioning column 95, sliding portion 951, heating system 10, first heating zone 101, second heating zone 102, third heating zone 103, exhaust mechanism 104; detection unit D; annealing unit E; winding unit F.Second embodiment: drying box 1, frame 11, bottom insulation layer 111, middle and lower insulation layer 112, middle and upper insulation layer 113, Top insulation layer 114, threaded hole 115, middle support column 12, beam lug 13, lower insulation pad 141, lower support column 142, upper insulation pad 143, upper support column 144, lifting ring 151, upper drying tunnel 161, lower drying tunnel 162, overhead section 163, sealing plate hanger 171, upper guide sealing plate 172, first inner layer support 173, sealing plate bracket 174, lower guide sealing plate 175, second inner layer support 176, static pressure box insulation layer 177, first mounting riser 191, second mounting riser 192, upper air duct assembly 193, lower air duct assembly 194, active drum mechanism 2, passive drum mechanism 3, passive drum 31, receiving seat 32, guide rail 331, slider 332, screw lifter 34, mounting plate 341, pressure sensor Component 35, fixed block 351, weighing sensor 352, connecting shaft 353, driving mechanism 36, reducer 361, motor 362, handwheel 363, spherical roller bearing 37, steel belt 4, outer insulation structure 5, upper insulation layer 591, hollow layer 592, lower insulation layer 593, maintenance insulation module 594, observation insulation module 595, splicing insulation module 596, insulation outer body 51, inspection port 511, first cavity 5111, second cavity 5112, third cavity 5113, first transition step 5114, second transition step 5115, mounting hole 512, outer insulation door body 52, insulation inner body 53, handle 54, universal ball 55, sealing strip 56, limit lock 57, hinge 581, door lock 582, extrusion die 6, film 7. Third embodiment: mounting frame 1, first translation mechanism 2, third guide rail 21, drive motor 22, screw 23, screw nut 24, displacement sensor 25, commutator 26, connecting rod 27, handwheel 28, third slider 29, transverse moving plate 3, longitudinal moving plate 4, second translation mechanism 5, second guide rail 51, second limit block 511, drive cylinder 52, second slider 53, first guide rail 6, first slider 61, first limit block 62, slide seat 7, bearing seat 71, bearing 72, rotating shaft 73, diverter hole 731, upper oil pan 74, lower oil pan 75, top plate 76, bottom plate 77, first side plate 78, second side plate 79, sprocket 8, track 9, plug 10.Fourth embodiment: first traction device 2, first frame 21, first adjusting roller 22, first height adjustment mechanism 221, first pressure roller 23, second height adjustment mechanism 231, first drive motor 24, first transition roller 25, first tension detection roller 26, first tension sensor 261, second transition roller 27, first traction roller 28, second traction device 3, second frame 31, second adjusting roller 32, second pressure roller 33, second drive motor 34, third transition roller 35, second tension detection roller 36, second tension sensor 361, fourth transition roller 37, second traction roller 38, second clamping assembly 39, winding unit 4, annealing module 5, box 51, inlet End 511, outlet end 512, inner layer 513, outer layer 514, support block 515, heating device 52, far-infrared ceramic heating plate 521, mounting bracket 522, exhaust device 53, main pipe 531, branch pipe 532, baffle 6, waist hole 61, first clamping edge assembly 7, translation mechanism 71, adjustment seat 72, lower clamping wheel 73, first driving cylinder 74, connecting rod 75, upper clamping wheel 76, corona machine 8, third bracket 81, corona generator 82, fifth transition roller 83, corona roller 84, sixth transition roller 85, second driving cylinder 86. DETAILED DESCRIPTION

[0105] First embodiment

[0106] In this embodiment, the “X-axis” is the width direction and the transverse direction of the transverse box body 7 ; the “Y-axis” is the length direction and the longitudinal direction of the transverse box body 7 , that is, the conveying direction of the polyimide film.

[0107] Please refer to Figures 1-13. The present invention provides a polyimide film production line, including a steel strip casting machine A, a peeling transition unit B, a transverse stretching machine C, a detection unit D, an annealing unit E and a winding unit F arranged in sequence. The steel strip casting machine A includes a drying box, an active drum mechanism arranged at one end of the drying box near the peeling transition unit B, a passive drum mechanism arranged at the other end of the drying box, a waist-shaped steel strip pulled by the active drum mechanism and the passive drum mechanism, an extrusion die set on the active drum mechanism, and a lead-out roller set below the extrusion die; the transverse stretching machine C includes a transverse stretching box body 7, a conveying system and a second nitrogen generating assembly, a heating system 10 is provided in the transverse stretching box body 7, an inlet end 71 is provided at one end of the transverse stretching box body 7 near the peeling transition unit B, and an outlet end is provided at the other end. End 72; the conveying system includes two symmetrically arranged traction mechanisms 8 and amplitude modulation mechanisms 9, the traction mechanism 8 includes a driven sprocket assembly 81 arranged near the inlet end 71, a driving sprocket assembly 82 arranged near the outlet end 72, and a chain 83 sleeved on the driving sprocket assembly 82 and the driven sprocket assembly 81, and the chain 83 is provided with a plurality of clamps 84 for clamping the polyimide film, and an inner track 85 located in the horizontal pulling box body 7 and an outer track 86 located outside the horizontal pulling box body 7 are provided between the driving sprocket assembly 82 and the driven sprocket assembly 81, and a plurality of amplitude modulation mechanisms 9 are arranged at equal intervals in the horizontal pulling box body 7, and the inner tracks 85 on the two traction mechanisms 8 are connected to the output end of the amplitude modulation mechanism 9 to adjust the distance between the two inner tracks 85; the second nitrogen generating assembly is used to transport nitrogen to the horizontal pulling box body 7.

[0108] Before transverse stretching, it is necessary to adjust the driven sprocket assembly 81, the driving sprocket assembly 82 and the amplitude modulation mechanism 9 according to the width of the PI film, wherein the distance between the two driven sprocket assemblies 81 is adjusted to the width of the PI film when it enters the entrance end 71 of the box body 1, the distance between the two driving sprocket assemblies 82 is adjusted to the width required after the PI film is stretched, and multiple amplitude modulation mechanisms 9 are adjusted to adjust the distance between the two inner rails 85, so that the inner rail 85 extends from the driven sprocket assembly 81 toward the driving sprocket assembly 82, that is, the distance between the two inner rails 85 gradually increases, thereby realizing continuous transverse stretching of the PI film.

[0109] During operation, the polyimide film raw material is added to the mixer, extruded through the extrusion die and cast onto the steel belt to form a polyimide slurry. The steel belt is first pulled by the active drum mechanism and the passive drum mechanism to transport the polyimide slurry into the drying tunnel. The polyimide slurry on the steel belt is dried and solidified to achieve preliminary heat setting. Then the steel belt carries the polyimide slurry and turns at the passive drum mechanism to enter the drying tunnel. It is then dried and solidified again to form a polyimide film. The polyimide film is cast through the lead-out roller to the stripping transition unit B. The polyimide film trimmed by the stripping transition unit B enters the transverse stretching machine C, and the second nitrogen generating assembly supplies nitrogen to the transverse stretching box 7. The chains 83 of the two traction mechanisms 8 move around the driven sprocket assembly 81, the inner track 85, the driving sprocket assembly 82 and the outer track 86. A plurality of clamps 84 clamp the two sides of the polyimide film in turn to pull the polyimide film forward. The heating system 10 heats the polyimide film so that the polyimide film undergoes imidization reaction in the transverse stretching box 7. Under the traction of the inner track 85, the chain 83 realizes continuous transverse stretching of the polyimide film to prevent the polyimide film from shrinking during the imidization process. After leaving the transverse stretching machine C, the polyimide film enters the detection unit D and the annealing unit E in turn, and is finally wound up by the winding unit F.

[0110] Please refer to Figure 2. By setting the outer rail 86 outside the transverse pull box 7, the components located inside the transverse pull box 7 can be reduced, thereby reducing the structure of the transverse pull box 7, making the structure of the transverse pull box 7 more compact, and reducing the heat loss transferred to the outer rail 86, thereby reducing heat energy loss; in addition, reducing the size of the transverse pull box 7 means reducing the space inside the transverse pull box 7, thereby reducing the energy consumption of the heating system 10 and reducing production costs.

[0111] Compared with the prior art, the total internal heating space of the horizontal pulling box 7 is reduced, so that the structure of the polyimide film production line is compact, energy consumption is reduced, and heat loss is effectively reduced.

[0112] It should be noted that the aforementioned peeling transition unit B, detection unit D, annealing unit E, and winding unit F are all prior art, and their specific structures and operating principles are not further described. The peeling transition unit B includes a clamping device, a floating roller, a pulling roller, a pressure roller, an adjusting roller, an electrostatic eliminator, an auxiliary winding device, an upper clamping device, and a film break detection device. The clamping device prevents curling on both sides of the film, and the floating roller balances the tension, preventing stretching, shrinkage, and film breakage, ensuring that the polyimide film enters the transverse stretching machine C smoothly. The detection unit D includes a cutter device, a storage device, an ultrasonic dust removal device, a thickness gauge, and a defect detection device. The cutter device removes waste edges from both sides of the polyimide film, which are then vacuumed into the storage device. The ultrasonic dust removal device removes dust particles adsorbed on the surface of the polyimide film. The thickness gauge detects the thickness of the finished film, and the defect detection device detects product defects in the finished film. The annealing unit E eliminates internal stress in the polyimide film, improving the material's structure and properties. The winding unit F winds the continuous polyimide film into a roll.

[0113] Referring to Figures 2 and 4 , the transverse stretching machine C in this embodiment further includes first protective covers 73 symmetrically positioned on either side of the transverse stretching housing 7 , with the outer rail 86 positioned within the first protective covers 73 . Specifically, a plurality of L-shaped brackets 74 are secured to each side of the transverse stretching housing 7 , with the outer rail 86 positioned on these brackets to enhance the stability of the outer rail 86 . The first protective covers 73 not only protect the outer rail 86 , but also insulate the chain 83 and clamp 84 that pass around the outer rail 86 , minimizing heat loss.

[0114] Similarly, the driven sprocket assembly 81 and the driving sprocket assembly 82 are respectively provided with a second protective cover 75 to protect the driven sprocket assembly 81 and the driving sprocket assembly 82 and to keep the chain 83 and the clamp 84 warm.

[0115] 4 and 5 , the driving sprocket assembly 82 includes a first bracket 821, a first slide 822 slidably arranged on the first bracket 821, a first lateral translation mechanism 823 arranged on the first bracket 821, and a first fixed seat 824 arranged on the first bracket 821. The first slide 822 is rotatably connected to the first movable sprocket 825. A driving assembly 826 for driving the first movable sprocket 825 to rotate is provided between the first slide 822 and the output end of the first lateral translation mechanism 823. The first fixed seat 824 is rotatably connected to the first fixed sprocket 827. One end of the inner rail 85 is provided on the first slide 822, and one end of the outer rail 86 is provided on the first bracket 821. Through the above-mentioned setting, the first lateral translation mechanism 823 drives the first slide 822 to move horizontally along the X-axis to adjust the installation position of the first movable sprocket 825, and the driving assembly 826 drives the first movable sprocket 825 to rotate to realize the circular motion of the driving chain 83 around the driving sprocket assembly 82, the outer track 86, the driven sprocket assembly 81 and the inner track 85.

[0116] Optionally, the first lateral translation mechanism 823 can be a motor-driven ball screw transmission assembly motion mechanism to achieve horizontal movement of the drive assembly 826; the drive assembly 826 can use a motor-driven reducer as a power source, and the reducer drives the first movable sprocket 825 to rotate.

[0117] It should be understood that the positions of the first movable sprockets 825 on the two driving sprocket assemblies 82 need to be adjusted simultaneously so that the two first movable sprockets 825 are symmetrically arranged to stretch the polyimide film to a desired width.

[0118] 4 and 6 , the driven sprocket assembly 81 includes a second bracket 811, a transverse moving plate 812 slidably arranged on the second bracket 811, a second transverse translation mechanism 813 arranged on the second bracket 811, a longitudinal moving plate 814 slidably arranged on the transverse moving plate 812, a longitudinal translation mechanism 815 arranged on the longitudinal moving plate 814, a second slide 816 arranged at the output end of the longitudinal translation mechanism 815, and a second fixed seat 817 arranged on the second bracket 811; the transverse moving plate 812 is connected to the output end of the second transverse translation mechanism 813, and the translation direction of the longitudinal moving plate 814 is perpendicular to the translation direction of the transverse moving plate 812; a second movable sprocket 818 is rotatably connected to the second slide 816, and a second fixed sprocket 819 is rotatably connected to the second fixed seat 817; the other end of the inner rail 85 is arranged on the longitudinal moving plate 814, and the other end of the outer rail 86 is arranged on the second bracket 811. Through the above-mentioned setting, the second transverse translation mechanism 813 drives the transverse movable plate 812 to move horizontally along the X-axis to adjust the installation position of the second movable sprocket 818 in the X-axis direction, so as to be suitable for conveying polyimide films of different widths into the transverse pulling box 7; and the longitudinal translation mechanism 815 drives the second fixed seat 817 to move horizontally along the Y-axis to adjust the installation position of the second movable sprocket 818 in the Y-axis direction to adjust the tension of the chain 83.

[0119] Furthermore, two parallel guide rails are provided on the transverse movable plate 812, and a slider slidably connected to the guide rails is provided at the bottom of the longitudinal movable plate 814. Under the action of the inner rail 85, the longitudinal movable plate 814 can be pushed to move horizontally along the guide rail, that is, to move horizontally along the Y-axis seat. Since the heating system 10 is required to heat the polyimide film during the transverse stretching process, the temperature in the transverse pulling box 7 rises, causing the inner rail 85 to expand due to the heat and extend along its length to push the longitudinal movable plate 814 to move along the guide rail. The distance it moves is determined by the length of the inner rail 85 extended after being heated. After the production process is completed, the heating system 10 stops heating, the temperature in the transverse pulling box 7 gradually drops to room temperature, and the inner rail 85 recovers its deformation, thereby pulling the longitudinal movable plate 814 to reset. It can be seen that the longitudinal movable plate 814 can adaptively translate a corresponding distance according to the changes caused by the thermal deformation of the inner track 85, avoiding the deformation of the driven sprocket assembly 81 due to the squeezing of the inner track 85, thereby ensuring the transverse stretching quality of the polyimide film.

[0120] In this embodiment, the two driven sprocket assemblies 81 share a second lateral translation mechanism 813. Specifically, the second lateral translation mechanism 813 includes a motor-driven ball screw transmission assembly to move, and the screw of the ball screw transmission assembly has two sections of threads with opposite rotation directions, so as to drive the two lateral moving plates 812 to move toward or away from each other synchronously.

[0121] In this embodiment, the longitudinal translation mechanism 815 may be a cylinder to push the second slide 816 to move horizontally along the Y-axis.

[0122] In this embodiment, as shown in FIG. 4 , the distance between the second movable sprocket 818 and the second fixed sprocket 819 is relatively short, and the chain 83 can be directly wound from the second fixed sprocket 819 to the second movable sprocket 818 .

[0123] In other embodiments, the distance between the second movable sprocket 818 and the second fixed sprocket 819 may be larger to prevent the chain 83 from sagging when it passes from the second fixed sprocket 819 to the second movable sprocket 818. As shown in Figures 7 and 8, a follower guide mechanism 87 is further included. The follower guide mechanism 87 includes a fixed frame 871 rotatably connected to the second fixed seat 817, a movable frame 872 rotatably connected to the second slide 816, and a docking track 873 provided on the fixed frame 871. A telescopic assembly 874 is provided between the docking track 873 and the movable frame 872. The docking track 873 is always located on a tangent line between the second fixed sprocket 819 and the second movable sprocket 818.

[0124] It should be noted that the rotation center of the fixed frame 871 is coaxial with the axis of the second fixed sprocket 819 ; the rotation center of the movable frame 872 is coaxial with the axis of the second movable sprocket 818 .

[0125] When adjusting the position of the second movable sprocket 818, the fixed frame 871 swings about the axis of the second fixed sprocket 819, and the movable frame 872 moves with the second slide 816 and swings about the axis of the second movable sprocket 818. Under the guidance of the telescopic assembly 874, the docking track 873 is always located on the tangent line of the second fixed sprocket 819 and the second movable sprocket 818, thereby guiding and supporting the chain 83. The structure of the docking track 873 and the chain 83 is shown in Figure 9.

[0126] In addition, when the distance between the second movable sprocket 818 and the second fixed sprocket 819 is large, the translation distance of the second movable sprocket 818 can be increased, which is further suitable for stretching films of various widths and suitable for horizontally stretching films with larger widths.

[0127] 8 , the telescopic assembly 874 includes a fixed block 8741 mounted on the movable frame 872, a guide rod 8742 having one end mounted on the fixed block 8741, and a guide seat 8743 mounted on the docking track 873. The guide rod 8742 is slidably connected to the guide seat 8743. When the second movable sprocket 818 changes position, the movable frame 872 changes position along with the second slide 816, causing the guide rod 8742 to slide along the guide seat 8743 to compensate for the change in distance between the docking track 873 and the movable frame 872, thereby ensuring that the docking track 873 is always tangent to the second movable sprocket 818 and the second fixed sprocket 819.

[0128] Likewise, the structure in which the second fixed sprocket 819 is rotatably connected to the second fixed seat 817 is similar to the structure in which the second movable sprocket 818 is rotatably connected to the second slide 816 , and reference may be made to the second slide 816 for details.

[0129] Similarly, the driving sprocket assembly 82 may be provided with a follower guide mechanism 87 to guide and support the chain 83 that is wound from the first movable sprocket 825 to the first fixed sprocket 827 .

[0130] Referring to Figures 10 and 11, the amplitude modulation mechanism 9 includes an amplitude modulation track 91, a width adjustment device 92 and a slide 93. The two ends of the amplitude modulation track 91 are respectively connected to the two sides of the horizontal pull box 7. The two slides 93 are slidably arranged on the amplitude modulation track 91. The output end of the width adjustment device 92 is connected to the two slides 93 so that the two slides 93 can move toward or away from each other synchronously; an adjustment seat 94 is provided on the top of each slide 93, and an adjustment slot 941 is opened on the top of the adjustment seat 94, and the length extension direction of the adjustment slot 941 is perpendicular to the translation direction of the slide 93. The adjustment slot 941 is slidably connected to a positioning column 95, and the positioning column 95 is connected to the inner track 85. Specifically, the width adjustment device 92 includes a drive motor 921 arranged on the side wall of the horizontal pulling box 7 and a width adjustment screw rod 922 rotatably connected to both sides of the horizontal pulling box 7. The width adjustment screw rod 922 is provided with two sections of threads with opposite rotation directions. The two slides 93 are respectively engaged with the width adjustment screw rod 922 through screw nuts. The drive motor 921 drives the width adjustment screw rod 922 to rotate so that the two slides 93 move toward or away from each other synchronously along the amplitude modulation track 91 to adjust the distance between the inner tracks 85 located at this position. However, during the adjustment process, the positioning column 95 slides along the adjustment slot 941 to compensate for the change in the center distance between the two adjacent amplitude modulation mechanisms 9 and the slides 93 located on the same side.

[0131] Furthermore, referring to Figure 12 , the AM track 91 is made of rectangular steel. The slide 93 includes two symmetrically arranged side plates 931 and two connecting plates 932 disposed between the side plates 931. The AM track 91 is disposed between the side plates 931. Rollers 933 are rotatably connected to the side plates 931, and the rollers 933 are slidably connected to the AM track 91. The two side plates 931 guide the movement of the slide 93, preventing it from deflecting during movement.

[0132] Preferably, the inner rail 85 includes a plurality of track segments 851 connected in sequence, with a positioning post 95 positioned at the connection between two adjacent track segments 851. The mating structure of the inner rail 85 and the chain 83 is shown in FIG13 . The inner rail 85 is provided with a guide portion 852 that cooperates with the chain 83 and can guide and support the chain 83. The chain 83 and the clamp 84 are both conventionally constructed, and their specific structures and operating principles are not further described. The adjustment slot 941 is an inverted T-shaped slot, and the lower end of the positioning post 95 is provided with a sliding portion 951 that is slidably connected to the adjustment slot 941. The middle portion of the adjustment slot 941 has an insertion hole 942 that matches the sliding portion 951. During assembly, the positioning post 95 can slide into the adjustment slot 941 through the insertion hole 942 and, guided by the adjustment slot 941, can slide along the conveying direction of the polyimide film. In addition, since the sliding portion 951 is an arc surface, the sliding portion 951 can also swing at a small angle around its axis while sliding along the adjustment groove 941 to cooperate with the position adjustment of the inner rail 85.

[0133] Preferably, a lubricating oil groove 943 is provided on the top of the adjustment seat 94. By adding lubricating oil into the lubricating oil groove 943, the friction between the inner track 85 and the adjustment seat 94 and the friction between the positioning column 95 and the adjustment groove 941 are reduced, thereby ensuring the smoothness of the position adjustment of the inner track 85.

[0134] It should be understood that by splicing multiple track segments 851 into a long inner track 85, on the one hand, it provides good support for the inner track 85, and on the other hand, it can reduce the difficulty of assembling the inner track 85. With the cooperation of each amplitude modulation mechanism 9, the inclination angle of the inner track 85 can be adjusted, so that the polyimide film is pulled by the clamps 84 on both sides and is continuously stretched laterally under the guidance of the two left-right symmetrical inner tracks 85.

[0135] Likewise, the outer track 86 may also be formed by splicing together multiple track segments to reduce the difficulty of assembling the outer track 86 .

[0136] Preferably, referring to Figure 3, the heating system 10 is sequentially provided with a first heating zone 101, a second heating zone 102 and a third heating zone 103 along the conveying direction of the polyimide film, the temperature of the second heating zone 102 is higher than that of the first heating zone 101 and the third heating zone 103, and an exhaust mechanism 104 is provided at the top of the first heating zone 101 and the third heating zone 103. Specifically, the first heating zone 101, the second heating zone 102 and the third heating zone 103 are all provided with electric heating tubes. The electric heating tubes of the first heating zone 101 are arranged below the polyimide film, the electric heating tubes of the second heating zone 102 are arranged above and below the polyimide film, and the electric heating tubes of the third heating zone 103 are arranged below the polyimide film, so that the temperature in the horizontal stretching box 7 gradually increases and then gradually decreases along the direction of the inlet end 71 and the outlet end 72, and an exhaust mechanism 104 is arranged at the top of the first heating zone 101 and the third heating zone 103. The exhaust mechanism 104 discharges the gas in the horizontal stretching box 7 so that the temperature of the inlet end 71 and the outlet end 72 will not be too high, thereby avoiding a large temperature difference between this position and the workshop, thereby affecting the transverse stretching effect of the polyimide film.

[0137] Second embodiment

[0138] Please refer to Figures 14 to 26. The steel strip casting machine of the PI film production line provided in this embodiment includes a drying box 1, an active drum mechanism 2 arranged at one end of the drying box 1, a passive drum mechanism 3 arranged at the other end of the drying box 1, and a waist-shaped steel strip 4 pulled by the active drum mechanism 2 and the passive drum mechanism 3. The drying box 1 includes a frame 11, an outer insulation structure 5 arranged on both sides of the frame 11, an upper air duct assembly 193 and a lower air duct assembly 194 arranged on the frame 11, a hot air unit for providing hot air to the upper air duct assembly 193 and the lower air duct assembly 194, and a nitrogen generating assembly; the frame 11 includes a bottom insulation layer 111, a middle and lower insulation layer 112, a middle and upper insulation layer 113, and a top insulation layer 114, which are arranged in sequence from bottom to top and parallel to each other; the middle and lower insulation layer 112 and the middle and upper insulation layer 113 are connected by a plurality of middle support columns 12, and some of the middle support columns 12 are connected. The side of the column 12 is fixed with a beam lug 13 for cooperating with the longitudinal beam; the bottom insulation layer 111 and the middle and lower insulation layer 112 are connected by a lower support column 142; the top insulation layer 114 and the middle and upper insulation layer 113 are connected by an upper support column 144; a plurality of hanging rings 151 are provided on the top surface of the top insulation layer 114; an upper baking hole is formed between the top insulation layer 114 and the middle and upper insulation layer 113 for the upper straight section of the steel strip 4 to pass through The lower drying tunnel 161 is formed between the bottom insulation layer 111 and the middle and lower insulation layer 112, and the lower straight section of the steel strip 4 passes through is formed. An overhead interval 163 is formed between the middle and upper insulation layer 113 and the middle and lower insulation layer 112. The upper air duct assembly 193 is arranged at the bottom of the top insulation layer 114, and the lower air duct assembly 194 is arranged at the top of the bottom insulation layer 111; the nitrogen generating assembly is used to transport nitrogen to the upper drying tunnel 161 and the lower drying tunnel 162.

[0139] During operation, the polyimide film 7 raw material is added to the mixer, extruded through the extrusion die 6 and cast onto the steel belt 4 to form a polyimide slurry. Nitrogen is delivered to the upper drying channel 161 and the lower drying channel 162 by the nitrogen generating assembly. The steel belt 4 is first pulled by the active drum mechanism 2 and the passive drum mechanism 3 to convey the polyimide slurry into the upper drying channel 161. Then, the upper air duct assembly 193 blows hot air to dry and solidify the polyimide slurry on the steel belt 4 to achieve preliminary heat setting. Then, the steel belt carrying the polyimide slurry turns at the passive drum mechanism 3 and enters the lower drying channel 162. Then, the lower air duct assembly 194 blows hot air to dry and solidify the polyimide slurry on the steel belt 4 again to form the polyimide film 7. Finally, the polyimide film 7 is cast onto the stripping transition mechanism via the guide roller. The other components of the PI film production line in this embodiment can be referred to the first embodiment and will not be repeated here.

[0140] Please refer to Figure 18. By setting an overhead section 163 inside the drying box 1, the interior of the drying box 1 can be divided into an upper drying channel 161 and a lower drying channel 162. Compared with the interior of the drying box 1 being completely open and connected, it has the following characteristics: on the one hand, it can form a horizontal hot air flow path in the upper drying channel 161 and the lower drying channel 162, so that the hot air can maintain a larger and appropriate wind pressure, and the polyimide slurry on the steel strip can be blown and solidified more concentratedly and stably, thereby improving the forming speed and effect of the polyimide film; on the other hand, the overhead section 163 means that there is no need to heat this area, which greatly reduces the total heating space, and also reduces the heat loss caused by the heat transfer of hot air to the area, which is more energy-saving and environmentally friendly.

[0141] When the steel belt needs to be disassembled for maintenance after long-term use, the outer insulation structure 5 on one side of the drying box 1 is first disassembled to open the interior of the drying box 1, and then the hook and ring 151 of the overhead crane or the hook and ring 151 of the electric hoist installed on the roof are used to maintain the position of the top insulation layer 114 in a hoisting manner. Then the longitudinal beam is inserted into the beam lug 13, and the longitudinal beam supports the middle and lower insulation layer 112 and the middle and upper insulation layer 113 to maintain the position of the middle and lower insulation layer 112 and the middle and upper insulation layer 113, and the bottom insulation layer 111 is directly supported by the ground to maintain its position unchanged. Then the frame 11 only needs to disassemble the lower support column 142 and the upper support column 144 on the side of the steel belt unloading direction to solve the obstruction of the lower support column 142 and the upper support column 144 to the movement of the steel belt 4, ensuring that the steel belt 4 is efficiently moved longitudinally to achieve disassembly. It can be understood that although part of the lower support column 142 and the upper support column 144 have been disassembled, the positions of the bottom insulation layer 111, the middle and lower insulation layer 112, the middle and upper insulation layer 113 and the top insulation layer 114 are stably maintained without displacement, so it will not affect the setting of the upper air duct assembly 193 and the lower air duct assembly 194, that is, the disassembly and assembly of the steel belt 4 does not require modification or disassembly of the upper air duct assembly 193 and the lower air duct assembly 194, ensuring that it will not affect the normal use of the upper air duct assembly 193 and the lower air duct assembly 194, and there is no need to spend time debugging the upper air duct assembly 193 and the lower air duct assembly 194 in the later stage.

[0142] Compared with the prior art, the drying box of the steel strip casting machine provided by the present invention fully takes into account the needs of later disassembly and assembly of the steel strip, and meets the disassembly and assembly of the steel strip with minimal disassembly and assembly workload. The frame 11 of the drying box is cleverly provided with a lifting ring 151 and a beam lug 13, which can quickly and pre-maintain the positions of the middle and lower insulation layer 112, the middle and upper insulation layer 113 and the top insulation layer 114 before disassembling the steel strip. Even if the lower support column 142 and the upper support column 144 are removed to remove the obstruction to the steel strip, the positions of the middle and lower insulation layer 112, the middle and upper insulation layer 113 and the top insulation layer 114 will not change. On the one hand, it ensures that the steel strip can be quickly disassembled and assembled, thereby improving work efficiency. On the other hand, the frame 11 of the drying box 1 has a small amount of disassembly and assembly changes, which is convenient for later recovery.

[0143] Specifically, the beam lug 3 comprises a base mounting plate and a square-shaped insert plate. One side of the insert plate is welded to the base mounting plate, ensuring the overall structural strength and stability. The square-shaped insert plate design allows the beam lug 3 to quickly engage with the square tubular longitudinal beam, ensuring that the longitudinal beam can bear the entire weight of the middle and lower insulation layer 12 and the middle and upper insulation layer 13, providing convenient operation during disassembly and maintenance.

[0144] Furthermore, the beam insertion lugs 13 are provided with four, two of which can be inserted by the same longitudinal beam, forming a left lug assembly. The remaining two beam insertion lugs 13 can be inserted by the same longitudinal beam, forming a right lug assembly. The left and right lug assemblies are arranged symmetrically. The symmetrical arrangement of the left and right lug assemblies ensures that at least two longitudinal beams jointly bear the weight of the middle and lower insulation layer 112 and the middle and upper insulation layer 113, resulting in a reasonable weight distribution. This not only prevents the longitudinal beams from breaking due to excessive load, but also improves the balance and stability of the middle and lower insulation layer 112 and the middle and upper insulation layer 113 after they are erected.

[0145] The upper air duct assemblies 193 are provided with multiple and laterally spaced apart arrangements, and upper concave cavities are formed between adjacent upper air duct assemblies 193. However, the upper concave cavities will cause turbulence in the hot air in the upper drying tunnel 161, affecting the drying and curing effect of the hot air on the polyimide slurry. Therefore, each upper concave cavity is provided with a sealing plate hanger 171 fixed to the bottom surface of the top insulation layer 114, and a flat upper guide sealing plate 172 is provided on the sealing plate hanger 171; the upper guide sealing plate 172 covers the space of the upper concave cavity, so that the hot air in the upper drying tunnel 161 can stably and centrally heat the polyimide slurry on the steel strip.

[0146] Furthermore, the cover hanger 171 is screwed to the middle and upper insulation layer 113 via first inner support posts 173. This arrangement allows the first inner support posts 173 to support the cover hanger 171, thereby strengthening the support provided by the middle and upper insulation layer 113 to the interior of the top insulation layer 114, thereby reducing deformation or collapse of the interior of the top insulation layer 114 due to lack of support. It is understood that before removing or installing the steel strips, the first inner support posts 173 must be removed to eliminate any obstruction to the movement of the steel strips.

[0147] Similarly, the downwind duct components 194 are provided in plurality and are arranged at laterally intervals, and a lower concave cavity is formed between adjacent downwind duct components 194. However, the lower concave cavity will cause turbulence of the hot air in the upper drying tunnel 161, affecting the drying and curing effect of the hot air on the polyimide slurry. Each lower concave cavity is provided with a sealing plate bracket 174 fixed to the upper surface of the bottom insulation layer 111, and the sealing plate bracket 174 is provided with a flat lower guide sealing plate 175. The lower guide sealing plate 175 covers the space of the lower concave cavity, so that the hot air in the lower drying tunnel 162 can stably and centrally heat the polyimide slurry on the steel strip.

[0148] In fact, lower insulation pads 141 are fixedly provided on the top surfaces of both ends of the bottom insulation layer 111, and each lower insulation pad 141 is connected to the middle and lower insulation layer 112 via a lower support column 142; upper insulation pads 143 are provided on the bottom surfaces of both ends of the top insulation layer 114, and each upper insulation pad 143 is connected to the middle and upper insulation layer 113 via an upper support column 144. The provision of the upper insulation pads 143 and the lower insulation pads 141 is, on the one hand, to reduce the inlet and outlet of the steel strip in the drying box and reduce heat loss through the inlet and outlet, and on the other hand, the functions of the upper insulation pads 143 and the lower insulation pads 141 are the same as those of the upper guide sealing plate 172 and the lower guide sealing plate 175, which are also to compensate for the cavity problem.

[0149] Furthermore, the cover plate bracket 174 is screwed to the middle and lower insulation layer 112 via second inner support pillars 176. This arrangement strengthens the support provided by the bottom insulation layer 111 to the middle and upper insulation layer 113, thereby reducing deformation or collapse of the middle and upper insulation layer 113 due to lack of support. It is understood that before removing and installing the steel strip 4, the second inner support pillars 176 must be removed to eliminate any obstruction to the movement of the steel strip 4.

[0150] It should be understood that the upper drying tunnel 161 has multiple plate closure hangers 171 and upper guide plates 172 that cooperate with them. The size of each plate closure hanger 171 and upper guide plates 172 is determined by the size of the upper cavity. The lower drying tunnel 162 has multiple plate closure brackets 174 and lower guide plates 175 that cooperate with them. The size of each plate closure bracket 174 and lower guide plates 175 is determined by the size of the lower cavity.

[0151] Preferably, in order to rationally utilize the internal space of the overhead section 163, a static pressure box insulation layer 177 is provided on the middle and lower insulation layer 112, that is, the static pressure box is arranged in the overhead section and is wrapped by the static pressure box insulation layer 177. The static pressure box insulation layer 177 can reduce the heat loss of the hot air in the static pressure box, and better transfer the hot air through the static pressure box to the upper air duct assembly 193 and the lower air duct assembly 194.

[0152] Preferably, casters are provided on the bottom surface of the middle and lower insulation layers 12, so that the drying box has a movable function, which facilitates the adjustment of the position according to the actual position and enables the drying box to be better connected with upstream and downstream equipment.

[0153] Preferably, one end of the middle lower insulation layer 112 and the middle upper insulation layer 113 are connected by a first mounting plate 191, and the other end is connected by a second mounting plate 192. The first mounting plate 191 is connected to the active drum mechanism 2, and the second mounting plate 192 is connected to the passive drum mechanism 3.

[0154] In fact, the lower support column 42, the upper support column 44, the first inner layer support column 73, and the second inner layer support column 76 are all arranged at the two horizontal sides of the insulation layer to avoid obstruction to the normal movement and transmission of the steel belt.

[0155] Specifically, the outer insulation structure 5 includes an upper insulation layer 591, a hollow layer 592 and a lower insulation layer 593 spliced ​​together from top to bottom. The upper insulation layer 591 is used to seal the upper drying tunnel 161, the hollow layer 592 is used to seal the overhead interval 163, and the lower insulation layer 593 is used to seal the lower drying tunnel 162. The upper insulation layer 591 and the lower insulation layer 593 both include an inspection and maintenance insulation module 594, an observation insulation module 595, and a splicing insulation module 596. The inspection and maintenance insulation module 594 and the observation insulation module 595 can be directly spliced ​​left and right, and the two inspection and maintenance insulation modules 594 are spliced ​​through the splicing insulation module 596. The maintenance and insulation module 594 is provided with a maintenance port 511, through which staff can enter the interior of the steel strip casting machine to perform component maintenance, replacement, cleaning and lubrication, and troubleshooting. The observation and insulation module 595 is provided with an observation window, through which staff can directly view the internal conditions of the steel strip casting machine.

[0156] Furthermore, the maintenance insulation module 594 is in a "convex" shape when projected from above, and the observation insulation module 595 is in an inverted "convex" shape when projected from above, so that the joint of the maintenance insulation module 594 and the observation insulation module 595 forms a stepped labyrinth seal. Compared with the planar splicing of the maintenance insulation module 594 and the observation insulation module 595, it can effectively reduce the heat transfer to the outside from the splicing gap between the maintenance insulation module 594 and the observation insulation module 595, thereby improving the insulation performance.

[0157] To standardize the structure of maintenance insulation module 594 and reduce the complexity of manufacturing maintenance insulation module 594, two maintenance insulation modules 594 are spliced ​​together using a splicing insulation module 596. Splicing insulation module 596 also appears in an inverted "convex" shape when viewed from above. The splicing of maintenance insulation module 594 and splicing insulation module 596 forms a stepped labyrinth seal, which effectively reduces heat transfer from the splicing gap between maintenance insulation module 594 and splicing insulation module 596 to the outside, thereby improving thermal insulation performance.

[0158] Specifically, the maintenance and insulation module 594 includes an insulation outer body 51 having an inspection opening 511, an outer insulation door 52 for closing or opening the inspection opening 511, and an insulation inner body 53 disposed within the insulation outer body 51 and used to fill the inspection opening 511; the inspection opening 511 is a rectangular structure. In operation, the insulation inner body 53 needs to be installed to fill the inspection opening 511 to reduce heat loss through the inspection opening 511. During maintenance, the insulation inner body 53 is pulled out of the inspection opening 511 to open the inspection opening 511 for staff to enter. However, the insulation inner body 53 is heavy and has a certain volume, resulting in a very large friction between the insulation inner body 53 and the insulation outer body 51, making it very inconvenient for staff to pull out and put in the insulation inner body 53. This is not only time-consuming and labor-intensive, but also difficult to adjust the position of the insulation inner body 53.

[0159] Therefore, a handle 54 is provided on the front end surface of the heat-insulating inner body 53 , and a plurality of universal balls 55 are provided on the outer wall surface of the heat-insulating inner body 53 . The staff opens the outer insulation door 52, then holds the handle 54 of the insulation inner body 53, and then pulls out the insulation inner body 53. Since the universal ball 55 is mainly arranged on the bottom, left and right sides of the insulation inner body 53, the universal ball 55 located on the bottom of the insulation inner body 53 forms rolling friction with the inner wall surface of the insulation outer body 51, and the friction force is small. The staff only needs to use a small amount of force to smoothly pull out the insulation inner body 53 from the back to the front. At the same time, even if the left and right sides of the insulation inner body 53 are too close to the insulation outer body 51, the universal balls 55 on the left and right sides of the insulation inner body 53 greatly reduce the friction resistance formed by the left and right sides of the insulation inner body 53 and the inner wall surface of the insulation outer body 51. The staff can pull out the insulation inner body 53 smoothly and unimpeded, thereby releasing the inspection port 511 for the staff to enter the interior of the steel strip casting machine.

[0160] On the contrary, when the thermal insulation inner body 53 is to be installed, the staff holds the handle 54 of the thermal insulation inner body 53, then places the thermal insulation inner body 53 into the inspection port 511 of the thermal insulation outer body 51, and then gradually pushes the thermal insulation inner body 53 into the inspection port 511. The thrust is small, and the position of the thermal insulation inner body 53 can be flexibly adjusted during the pushing process to ensure that the thermal insulation inner body 53 is centered in the set position.

[0161] The maintenance and insulation module 594 of the steel strip casting machine simplifies the maintenance process by providing an inspection port 511 on the insulation outer body 51 and a closable outer insulation door 52, allowing staff to easily enter the interior to replace, clean, lubricate and troubleshoot parts. When maintenance is not required, the insulation inner body 53 is filled in the inspection port 511, reducing heat transfer from the inspection port 511 to the outside and reducing energy waste. Since the front end surface of the insulation inner body 53 is provided with a handle 54 and the outer wall surface is provided with multiple universal balls 55, it is easier to extract and insert the insulation inner body 53, reducing the workload of the operator and improving work efficiency.

[0162] Furthermore, the inspection opening 511 includes a first cavity 5111, a second cavity 5112, and a third cavity 5113, arranged sequentially from the inside out. The space of the first cavity 5111 is smaller than that of the second cavity 5112, forming a first transition step 5114 between the first and second cavities 5111 and 5112. The space of the second cavity 5112 is smaller than that of the third cavity 5113, forming a second transition step 5115 between the second and third cavities 5112 and 5113. The outer insulation door 52 is disposed in the third cavity 5113, and the insulation inner cavity 53 is disposed in the second cavity 5112. The insulation inner cavity 53 provides a primary layer of thermal insulation for the inspection opening 511, while the outer insulation door 52 provides a secondary layer of thermal insulation for the inspection opening 511. This dual insulation significantly reduces heat leakage and ensures the thermal insulation effect of the steel strip casting machine.

[0163] Furthermore, the rear end of the thermal insulation inner body 53 presses against the first transition step 5114 to form a seal. This arrangement effectively reduces heat transfer directly through the gap between the outer wall of the thermal insulation inner body 53 and the thermal insulation outer body 51. A rectangular sealing strip 56, made of high-temperature-resistant silicone, encloses the second transition step 5115. This sealing strip 56 effectively fills the gap between the second transition step 5115 and the thermal insulation outer body 51, ensuring a good seal between the second chamber 5112 and the third chamber 5113 during operation, thereby minimizing heat leakage and energy waste.

[0164] Because of the strong hot air flow in the steel strip casting machine, the thermal insulation inner body 53 may be displaced by the hot air. Therefore, the thermal insulation inner body 53 is fixedly connected to the inner wall of the thermal insulation outer body 51 via a limit lock 57. The limit lock 57 ensures that the thermal insulation inner body 53 is firmly connected to the inner wall of the thermal insulation outer body 51, preventing the thermal insulation inner body 53 from falling off or shifting due to vibration or other reasons during operation, thereby improving the stability and reliability of the equipment operation.

[0165] Preferably, the limiting lock 57 can be a sealing buckle or a hasp. The sealing buckle or hasp not only effectively secures the heat-insulating inner body 53, forming a tighter connection between it and the heat-insulating outer body 51, further improving the sealing and heat-insulating effect of the steel strip casting machine in operation, but also provides a convenient and fast connection method, allowing maintenance personnel to easily remove and install the inner body, thereby improving maintenance efficiency.

[0166] Considering that when disassembling and assembling the steel strip, the maintenance insulation module 594, the observation insulation module 595 and the splicing insulation module 596 need to be quickly disassembled and then tightly installed, the maintenance insulation module 594, the observation insulation module 595 and the splicing insulation module 596 are all provided with mounting holes 512, and the sides of the bottom insulation layer 111, the middle and lower insulation layer 112, the middle and upper insulation layer 113 and the top insulation layer 114 are provided with threaded holes 115 corresponding to the mounting holes 512, and the long screws pass through the mounting holes 512 and connect with the threaded holes 115. With this arrangement, when the steel strip needs to be replaced, the operator can easily remove the outer insulation mechanism by twisting and removing the long screw, thereby improving the maintainability and maintenance efficiency of the steel strip casting machine; it also ensures that when in working state, the insulation module can be tightly attached to the frame 11 and has a strong sealing performance.

[0167] In this embodiment, the insulation outer body 51, the insulation inner body 53, and the outer insulation door body 52 are provided with insulation cotton; this can effectively reduce heat transfer, provide good insulation effect, help maintain a stable production environment and reduce energy consumption. One side of the outer insulation door body 52 is connected to the insulation outer body 51 by a hinge 581, and the other side is connected to the insulation outer body 51 by a door lock 582. The connection design of the hinge 581 and the door lock 582 allows the outer insulation door body 52 to be easily opened or closed. The use of the door lock 582 helps to ensure that the door body forms a good seal with the insulation outer body 51 when closed, preventing heat leakage while also ensuring the safety of the workplace. The door lock 582 can use locks such as sealing buckles and hasps, which are simple to operate and have good sealing performance.

[0168] When the steel belt is reinstalled on the steel belt casting machine, the steel belt 4 is in a loose state, and the active drum mechanism 2 and the passive drum mechanism 3 need to be used to tension the steel belt to provide traction for the steel belt. However, due to the traction and manufacturing errors, the steel belt will deviate left and right during the transmission process, or even deviate from the track. On the one hand, it is easy to cause stress concentration on the steel belt 4, reduce the service life of the steel belt, and affect the connectivity and stability of production; on the other hand, due to the instability of the steel belt, it is difficult to ensure that the polyimide slurry is evenly distributed on the surface of the steel belt during the casting process, thereby affecting the thickness uniformity of the polyimide film 7, and further affecting the quality of the polyimide film 7. Therefore, the passive drum mechanism 3 must have not only a tensioning function but also a deviation correction function.

[0169] Specifically, the passive drum mechanism 3 includes a passive drum 31, two sliding sockets 32 respectively connected to the two end shafts of the passive drum 31, and the same number of screw lifters 34 as the sliding sockets 32 and corresponding one to one. The lifter bodies of the two screw lifters 34 are fixed by a mounting plate 341, the input shaft of each screw lifter 34 is connected to the corresponding driving mechanism 36, and the output end of each screw lifter 34 is connected to the side of the sliding socket 32 ​​through a pressure sensing component 35; the sliding socket 32 ​​is arranged on the sliding socket 32 ​​through a guide rail 331 and a slider 332, and the guide rail 331 extends horizontally. The shaft sleeves at both ends of the passive drum 31 are provided with spherical roller bearings 37 connected to the corresponding sliding socket 32.

[0170] When the passive drum 31 tensions the steel belt, the two driving mechanisms 36 synchronously drive the output rod of the screw lifter 34 to extend, and then transmit it to the sliding receiving seat 32 through the pressure sensing component 35, so that the passive drum 31 moves in the direction away from the active drum. At this time, the tension of the steel belt on the passive drum 31 will be sensed by the pressure sensing component 35, that is, the pressure sensing component 35 senses that the tension value is getting larger and larger. When the tension value reaches the set tension value and the values ​​sensed by the two pressure sensors are the same, it means that the steel belt is properly tensioned and the axis of the passive drum 31 is in a left-right straight state.

[0171] As the steel belt is pulled and rotated, the steel belt 4 on the passive drum 31 will dynamically deviate left and right, or even detach from the passive drum 31. At this time, the steel belt must be corrected, that is, adjusted to a centered position. It is understood that once the steel belt deviates, the tension values ​​sensed by the two pressure sensing components 35 will change. At this time, based on the comparison of the tension value changes, the offset of the steel belt 4 is determined, and then one of the drive mechanisms 36 is controlled to drive the screw lifter 34 to move, applying a corrective force to the sliding support 32. Since the sliding support 32 is constrained by the guide rail 331 and the slider 332, the sliding support 32 actually does not change position. However, the spherical roller bearing 37 on the sliding support 32 has an allowable aligning angle of 1° to 2.5°. Under the action of the corrective force, the center position of the passive drum 31 end shaft on the spherical roller bearing 37 will change, causing the axis of the passive drum 31 to deviate slightly left and right, thereby driving the steel belt 4 to dynamically return to the centered position of the passive drum 31. It is understandable that, during the movement of the steel belt 4 , the passive drum mechanism 3 performs dynamic deviation correction on the steel belt 4 .

[0172] The passive drum mechanism 3 senses changes in tension through the pressure sensing component 35, allowing the structure to automatically determine the offset of the steel strip. It then coordinates with the drive mechanism 36 and the screw lifter 34 to dynamically correct the steel strip, ensuring that the steel strip is always centered. This not only increases the service life of the steel strip, but also ensures that the polyimide slurry is evenly distributed on the surface of the steel strip during the casting process, thereby ensuring the uniformity of the thickness of the polyimide film 7 and improving the product quality of the polyimide film 7. Furthermore, the ingenious use of the self-aligning characteristics of the spherical roller bearing 37 simplifies correction. Under the action of the correction force, the passive drum 31 can flexibly change the axial position of the passive drum 31 to adapt to different correction situations, while also providing a certain degree of fault tolerance for the installation of the passive drum 31. Specifically, the pressure sensing assembly 35 includes a fixed block 351, a weighing sensor 352, and a connecting shaft 353 connected in sequence. The fixed block 351 is fixed on the sliding supporting seat 32. The setting of the fixed block 351 enables the weighing sensor 352 to be firmly installed on the sliding supporting seat 32, maintaining the fixed position and stable working state of the weighing sensor 352, thereby improving the measurement accuracy; the connecting shaft 353 is connected to the output end of the screw lifter 34, so that the pressure sensing assembly 35 can accurately sense the force change state of the sliding supporting seat 32, thereby reflecting the tension of the passive drum 31 and the offset of the steel belt in real time.

[0173] Furthermore, the driving mechanism 36 includes a reducer 361 that is transmission-connected to the input end of the screw lifter 34 , and the input shaft of the reducer 361 is drive-connected to the motor 362 , and the motor 362 is connected to the control system to achieve automatic correction based on the feedback of the pressure sensing component 35 .

[0174] For situations requiring fine-tuning or manual intervention, manual operation allows for more direct and precise adjustments. Therefore, the input shaft of reducer 361 has dual inputs: one is connected to motor 362, and the other is connected to handwheel 363. This dual-input design allows for connection to either motor 362 or handwheel 363, providing the operator with the option of manual control. Manual operation can be controlled by rotating handwheel 363, while automated operation can be driven by motor 362, thus enabling switching between multiple operating modes.

[0175] The active drum mechanism 2 includes an active drum, two fixed receiving seats 32 rotatably connected to the shafts at both ends of the active drum, and a steel belt driving mechanism 36 for driving the active drum to rotate.

[0176] The upper duct assembly 193 and the lower duct assembly 194, and the hot air unit for providing hot air to the upper duct assembly 193 and the lower duct assembly 194 are existing equipment, and the upper duct assembly and the lower duct assembly 194 are structures that use dense air ducts to blow air.

[0177] The receiving base 2 is provided with an oil pipeline for supplying lubricating oil to the spherical roller bearing 7. The input end of the oil pipeline is connected to the oil cup. By supplying lubricating oil to the spherical roller bearing 7, rolling friction and wear are reduced, ensuring smooth runout correction of the passive drum 1, extending the service life of the bearing and reducing replacement costs.

[0178] The passive drum 1 is provided with a cooling channel, and a rotary joint is connected to the end shaft of the passive drum 1. The cooling channel can effectively dissipate the heat generated inside the passive drum 1, ensuring that the equipment can maintain a suitable operating temperature during operation and preventing equipment damage and performance degradation due to overheating.

[0179] A magnetostrictive displacement sensor is provided beside the guide rail 31, and the sensing end of the magnetostrictive displacement sensor is connected to the receiving seat 2. The magnetostrictive displacement sensor can monitor the position change of the receiving seat in real time, thereby realizing accurate control and monitoring of the position of the passive drum 1.

[0180] Third embodiment

[0181] Please refer to Figures 27-31. The sprocket mechanism of the transverse stretching machine in the PI film production line provided in this embodiment includes a mounting frame 1, a first translation mechanism 2 and two sprocket assemblies that move toward or away from each other; the first translation mechanism 2 is arranged on the mounting frame 1; the sprocket assembly includes a transverse moving plate 3 arranged at the output end of the first translation mechanism 2, a longitudinal moving plate 4 slidably arranged on the transverse moving plate 3 and a second translation mechanism 5 arranged on the longitudinal moving plate 4; two parallel first guide rails 6 are provided on the transverse moving plate 3, and a first slider 61 slidably connected to the first guide rail 6 is provided at the bottom of the longitudinal moving plate 4, and the translation direction of the longitudinal moving plate 4 is perpendicular to the translation direction of the transverse moving plate 3; the second translation mechanism 5 includes a slide 7 slidably connected to the longitudinal moving plate 4, and the translation direction of the slide 7 is parallel to the translation direction of the longitudinal moving plate 4; the slide 7 is rotatably connected to the sprocket 8; the longitudinal moving plate 4 is connected to the track 9.

[0182] The sprocket mechanism provided in this embodiment is provided at the inlet end of the PI film transverse stretching machine, and the track 9 is used to guide the movement direction of the chain. Other components of the PI film production line in this embodiment can also refer to the first embodiment or the second embodiment, and will not be repeated here.

[0183] According to the width of the PI film, the distance between the two sprocket assemblies is adjusted by the first translation mechanism 2 to be suitable for conveying the PI film of this width into the transverse stretching machine; and the installation position of the sprocket 8 is adjusted by the second translation mechanism 5 to adjust the tension of the chain and ensure that the chain can smoothly pull the PI film forward. During the stretching process, the track 9 is deformed by heat and pushes the longitudinal movable plate 4 outward. Under the guidance of the first guide rail 6, the longitudinal movable plate 4 moves along the first guide rail 6 in the direction away from the track 9. The distance it moves is determined by the length of the track 9 extended after being heated. After the production process is completed, the temperature in the transverse stretching machine gradually drops to room temperature, and the track 9 recovers its deformation, thereby pulling the longitudinal movable plate 4 back to its original position. This achieves adaptive translation of the corresponding distance according to the changes caused by the thermal deformation of the track 9, avoids deformation caused by the extrusion of the track 9, and ensures the transverse stretching quality of the PI film.

[0184] Referring to Figures 28 and 29, the first translation mechanism 2 includes two sets of third guide rails 21, each of which is provided on the mounting frame 1; a drive motor 22, which is provided on the mounting frame 1; and a screw rod 23, which is rotatably connected to the mounting frame 1. The transverse movable plate 3 on each sprocket assembly is slidably mounted on the corresponding third guide rail 21. Specifically, each set includes two parallel third guide rails 21, and each transverse movable plate 3 is provided with a third slider 29 at the bottom. The third guide rail 21 and the third slider 29 are slidably connected to define the movement direction of the transverse movable plate 3. The drive motor 22 drives the screw rod 23 to rotate. The screw rod 23 is provided with two sections of threads rotating in opposite directions. The bottom of each transverse movable plate 3 is provided with a screw nut 24 that engages with the screw rod 23. The drive motor 22 drives the screw rod 23 to rotate. The two sections of threads rotating in opposite directions engage with the two screw nuts 24, respectively, so that the two transverse movable plates 3 move synchronously toward or away from each other, thereby adjusting the distance between the two sprockets 8.

[0185] Furthermore, referring to FIG. 28 , the first translation mechanism 2 further includes a displacement sensor 25 mounted on the mounting frame 1, the extended end of the displacement sensor 25 being connected to the transversely movable plate 3. In this embodiment, a displacement sensor 5 is provided for each sprocket assembly. The displacement sensor 25 detects the position of the transversely movable plate 3 and feeds the detection signal back to the controller of the transverse stretching machine to monitor the travel distance of the transversely movable plate 3, thereby enabling precise adjustment of the distance between the two sprockets 8.

[0186] Furthermore, referring to Figures 28 and 29, the first translation mechanism 2 also includes a commutator 26. The output end of the drive motor 22 is connected to the input end of the commutator 26, which is in turn connected to the lead screw 23. The input end of the commutator 26 is further connected to a connecting rod 27, at the end of which is a handwheel 28. This arrangement allows the distance between the two sprockets 8 to be adjusted by controlling the drive motor 22 and rotating the handwheel 28, providing greater operational flexibility.

[0187] In this embodiment, the commutator 26 is preferably a worm gear commutator, the input end of the worm gear commutator is a worm, the worm is connected to the drive motor 22 and the connecting rod 27, and the output end of the worm gear commutator is a worm wheel, which drives the screw 23 to rotate.

[0188] Preferably, referring to FIG. 30 , first limiting blocks 62 are respectively provided at both ends of the first guide rail 6 to prevent the first sliding block 61 from sliding out of the first guide rail 6 .

[0189] Preferably, referring to FIG30 , the second translation mechanism 5 further includes second guide rails 51 and a drive cylinder 52 . Two parallel second guide rails 51 are provided on the longitudinally movable plate 4 . A second slider 53 is provided at the bottom of the slide 7 slidably connected to the second guide rails 51 , which serve as a guide. The cylinder body of the drive cylinder 52 is hingedly connected to the longitudinally movable plate 4 , and its extension rod is hingedly connected to the slide 7 . Extension or retraction of the extension rod of the drive cylinder 52 drives the longitudinally movable plate 4 to translate along the second guide rails 51 .

[0190] Furthermore, second limiting blocks 511 are respectively provided at both ends of the second guide rail 51 to limit the second sliding block 53 from sliding out of the second guide rail 51 .

[0191] Referring to Figure 31, the slide 7 is provided with two bearing seats 71, each of which is rotatably connected to a rotating shaft 73 via a bearing 72. The sprocket 8 is provided on the rotating shaft 73. Specifically, the slide 7 includes a top plate 76, a bottom plate 77, a first side plate 78, and a second side plate 79. The top plate 76 and the bottom plate 77 are arranged in parallel. The first side plate 78 is perpendicularly connected to the top plate 76 and the bottom plate 77 to form a C-shaped structure. The second side plate 79 is perpendicularly connected to the first side plate 78 and the top plate 76 and the bottom plate 77 to increase the structural strength of the slide 7. One bearing seat 71 is provided on the top plate 76, and the other bearing seat 71 is provided on the bottom plate 77. The two ends of the rotating shaft 73 are rotatably connected to the two bearing seats 71 via bearings 72. The above arrangement improves the stability of the installation of the rotating shaft 73 and the sprocket 8.

[0192] Optionally, the extension rod of the driving cylinder 52 is fixed with a Y-shaped joint, and a hinge seat is fixed on the first side plate 78, and the Y-shaped joint and the hinge seat are hinged.

[0193] In this embodiment, referring to FIG31 , the rotating shaft 73 is provided with an oil filling hole. A diverter hole 731 is formed on the sidewall of the rotating shaft 73 and communicates with the oil filling hole. The diverter hole 731 is used to drip lubricating oil into the bearing 72. When lubricating oil is dripped into the oil filling hole, the lubricating oil drips through the diverter hole 731 into the bearing 72, thereby lubricating the bearing 72.

[0194] In this embodiment, to facilitate the addition of lubricating oil to the oil filling hole, a through hole corresponding to the oil filling hole is provided on the top of the bearing seat 71 located on the top plate 76. A removable plug 10 is installed in the through hole. When filling the oil, the plug 10 is removed; after filling the oil, the plug 10 is replaced to prevent foreign matter from entering the bearing 72.

[0195] Among them, the oil filling hole is not drawn in the accompanying drawings, and an oil nozzle is provided on the oil filling hole for easy oil filling.

[0196] Preferably, referring to Figure 31, the slide 7 is also provided with an upper oil pan 74 located on the top of the sprocket 8 and a lower oil pan 75 located below the sprocket 8. The upper oil pan 74 and the lower oil pan 75 are used to receive the outflowing lubricating oil to prevent the lubricating oil from flowing out or overflowing the sprocket assembly and adhering to the PI film, which seriously affects the production quality of the PI film.

[0197] Fourth embodiment

[0198] Please refer to Figures 32-39. The secondary annealing device in the PI film production line provided in this embodiment is arranged between the annealing unit and the winding unit in the production line, including a first traction device 2, an annealing furnace, and a second traction device 3 arranged in sequence along the conveying direction of the PI film. The annealing furnace includes several annealing modules 5 arranged in parallel. The annealing module 5 includes a box body 51, a heating device 52 arranged in the box body 51, an exhaust device 53 arranged on the box body 51, and a third nitrogen generating assembly. One side of the box body 51 is provided with an inlet end 511, and the other side thereof is provided with an outlet end 512. The heating device 52 includes several far-infrared ceramic heating plates 521. The third nitrogen generating assembly is used to transport nitrogen to the box body 51.

[0199] In this embodiment, there are preferably two annealing modules 5, and the outlet end 512 of the upstream annealing module 5 is spliced ​​with the inlet end 511 of the downstream annealing module 5. The other components of the PI film production line in this embodiment can be similarly referred to the first to third embodiments and will not be repeated here.

[0200] During the secondary annealing, the PI film is transported forward into the annealing furnace under the action of the first traction device 2, and nitrogen is transported into the box by the third nitrogen generating assembly. After the multiple far-infrared ceramic heating plates 521 are powered on, they generate far-infrared radiation, which is absorbed by the object and converted into heat energy, thereby achieving the effect of heating the PI film. The heating method using the far-infrared ceramic heating plate 521 has high thermal efficiency and uniform temperature distribution; the PI film leaves the annealing furnace under the action of the second traction device 3, and is finally wound by the winding unit 4; compared with the existing technology, the internal stress of the PI film is well eliminated and the tensile strength of the PI film is improved.

[0201] Referring to Figure 39, the box body 51 includes an inner layer 513, an outer layer 514 and thermal insulation cotton filled between the inner layer 513 and the outer layer 514. The thermal insulation cotton has good thermal insulation effect, thereby reducing heat loss; a support block 515 for supporting the heating device 52 is provided in the box body 51 to improve the stability of the installation of the heating device 52; similarly, the support block 515 can be filled with thermal insulation cotton to achieve the effect of thermal insulation.

[0202] Referring to FIG39 , the heating device 52 further comprises a mounting frame 522 disposed on the support block 515. The mounting frame 522 comprises a rectangular frame formed by splicing together a plurality of angle irons. The rectangular frame has good structural stability and can well support and fix a plurality of far-infrared ceramic heating plates 521. The plurality of far-infrared ceramic heating plates 521 are disposed on the top and / or bottom of the mounting frame 522. That is, the plurality of far-infrared ceramic plates can be disposed on the top of the mounting frame 522, in which case the far-infrared ceramic plates are located above the PI film; the plurality of far-infrared ceramic plates can be disposed on the bottom of the mounting frame 522, in which case the far-infrared ceramic plates are located below the PI film; the plurality of far-infrared ceramic plates can be disposed on the top and bottom of the mounting frame 522, in which case the far-infrared ceramic plates are located above and below the PI film. This arrangement has a higher heating efficiency but consumes more energy. The specific arrangement should be determined according to actual production requirements.

[0203] Preferably, a plurality of far-infrared ceramic plates can be arranged on the top of the mounting frame 522, and a plurality of far-infrared ceramic heating plates 521 are arranged on the mounting frame 522 in a matrix arrangement to further improve the uniformity of temperature distribution.

[0204] Referring to Figures 38 and 39 , the exhaust device 53 includes a fan, a main pipe 531 connected to the fan, and several branch pipes 532 connected to the main pipe 531. The ends of the branch pipes 532 extend into the housing 51 and are respectively located near the inlet end 511 and the outlet end 512. The fan, which is not shown in the drawings, draws air, and the hot air in the housing 51 is discharged outdoors through the branch pipes 532 and the main pipe 531. Furthermore, the ends of the branch pipes 532 are located near the inlet end 511 and the outlet end 512 to prevent the temperature at the inlet end 511 and the outlet end 512 from being too high, that is, to prevent a large temperature difference between these locations and the workshop temperature, which would affect the annealing effect of the PI film.

[0205] Furthermore, referring to Figure 36 , two baffles 6 are respectively provided at the inlet 511 and outlet 512. These baffles 6 are symmetrically arranged vertically and slidably mounted on the housing 51. Specifically, the baffles 6 are L-shaped plates with vertically extending waist holes 61 fixed to the housing 51 via screws. During film threading, the spacing between the two baffles 6 is increased to facilitate threading. After threading is complete, the spacing between the two baffles 6 is decreased to narrow the distance between the inlet 511 and outlet 512, preventing heat from flowing into the workshop through the inlet 511 and outlet 512 and increasing the workshop temperature.

[0206] To increase the surface roughness of the PI film and facilitate subsequent coating, a corona treatment device 8 is also included, as shown in Figure 37, between the annealing furnace and the second traction device 3. Specifically, the corona treatment device 8 includes a third bracket 81 and a corona generator 82 mounted on the third bracket 81. A fifth transition roller 83, a corona roller 84, and a sixth transition roller 85 are connected to the third bracket 81, rotating in sequence along the conveying direction of the PI film. The corona generator 82 is located below the corona roller 84. The PI film passes over the fifth transition roller 83, the corona roller 84, and the sixth transition roller 85 in sequence. The corona roller 84 and the corona generator 82 cooperate to perform a corona treatment on the PI film, improving its surface adhesion and facilitating subsequent coating.

[0207] Specifically, a plurality of second driving cylinders 86 are provided on the third bracket 81 , and the extension rods of the second driving cylinders 86 are hinged to the corona generator 82 . The extension or retraction of the plurality of second driving cylinders 86 drives the corona generator 82 to move up and down to facilitate film penetration.

[0208] Referring to Figures 32 and 33, the first traction device 2 includes a first frame 21, a first adjusting roller 22 vertically slidably arranged on the frame, a first pressure roller 23 vertically slidably arranged on the first frame 21, and a first drive motor 24 arranged on the first frame 21. The first frame 21 rotates in sequence along the conveying direction of the PI film and is connected with a first transition roller 25, a first tension detection roller 26, a second transition roller 27 and a first traction roller 28. The first tension detection roller 26 has first tension sensors 261 at both ends, the first adjusting roller 22 is arranged between the second transition roller 27 and the first traction roller 28, the output end of the first drive motor 24 is connected to the first traction roller 28, and the first pressure roller 23 and the first traction roller 28 cooperate to convey the PI film. The PI film sequentially passes over the first transition roller 25, the first tension detection roller 26, the second transition roller 27, the first adjusting roller 22, and the first pulling roller 28. The first pressure roller 23 moves toward the first pulling roller 28, and the first drive motor 24 drives the first pulling roller 28 to rotate, so that the first pressure roller 23 and the first pulling roller 28 cooperate to convey the PI film. The first tension sensor 261 detects the tension applied to the first tension detection roller 26 and then adjusts the installation height of the first adjusting roller 22 to adjust the PI film tension to the appropriate level.

[0209] Referring to Figure 35 , the first traction device 2 further includes two symmetrically arranged first height adjustment mechanisms 221. The first height adjustment mechanisms 221 comprise a first mounting seat, a first slide vertically slidably mounted on the first mounting seat, and a first screw rotatably connected to the first mounting seat. The first slide engages with the first screw and is rotatably connected to the distal end of the first adjustment roller 22. A handwheel is provided at the upper end of the first screw. Turning the handwheel causes the first screw to drive the first slide to move up and down, thereby adjusting the mounting height of the first adjustment roller 22.

[0210] Referring to Figure 35 , the first traction device 2 further includes two symmetrically arranged second height adjustment mechanisms 231. The second height adjustment mechanisms 231 comprise a second slide mounted vertically on the first frame 21 and a third drive cylinder mounted on the first frame 21. The extension rod of the third drive cylinder is hingedly connected to the second slide, which is rotatably connected to the end of the first pressure roller 23. The extension or retraction of the extension rod of the third drive cylinder drives the first pressure roller 23 to move upward and downward, enabling the first pressure roller 23 to cooperate with the first traction roller 28 to transport the PI film.

[0211] Referring to FIG. 37 , the annealing furnace further includes two symmetrically arranged first edge clamping assemblies 7 located at the outlet end 512. The first edge clamping assemblies 7 include a translation mechanism 71, an adjustment seat 72 located at the output end of the translation mechanism 71, a lower clamping wheel 73 rotatably connected to the adjustment seat 72, a first drive cylinder 74 located on the adjustment seat 72, and a connecting rod 75 rotatably connected to the adjustment seat 72. One end of the connecting rod 75 is hinged to the extension rod of the first drive cylinder 74, and the other end is rotatably connected to the upper clamping wheel 76. According to the width of the PI film, the positions of the two adjustment seats 72 are adjusted by the two translation mechanisms 71, respectively, so that the upper clamping wheels 76 and the lower clamping wheels 73 can act on the side edges of the PI film. When clamping, the extension rod of the first drive cylinder 74 extends, and the upper clamping wheel 76 swings toward the lower clamping wheel 73. The upper clamping wheel 76 and the lower clamping wheel 73 cooperate to clamp the edge of the PI film, and then the position of the adjustment seat 72 is adjusted outward, causing the PI film to expand and relax, thereby preventing wrinkles in the PI film.

[0212] As mentioned above, the translation mechanism 71 can be a handwheel-driven ball screw transmission assembly mechanism to adjust the position of the adjustment seat 72.

[0213] Referring to Figures 32 and 33, the second traction device 3 includes a second frame 31, a second adjusting roller 32 vertically slidably arranged on the second frame 31, a second pressure roller 33 vertically slidably arranged on the second frame 31, a second drive motor 34 arranged on the second frame 31 and two second clamping assemblies 39 symmetrically arranged on the second frame 31. The second frame 31 rotates in sequence along the conveying direction of the PI film and is connected with a third transition roller 35, a second tension detection roller 36, a fourth transition roller 37 and a second traction roller 38. Second tension sensors 361 are respectively provided at both ends of the second tension detection roller 36. The second adjusting roller 32 is arranged between the fourth transition roller 37 and the second traction roller 38. The output end of the second drive motor 34 is connected to the second traction roller 38. The second pressure roller 33 and the second traction roller 38 cooperate to convey the PI film. The two second clamping assemblies 39 are arranged on the downstream side of the second traction roller 38. The PI film sequentially passes over the third transition roller 35, the second tension detection roller 36, the fourth transition roller 37, the second adjusting roller 32, the second pulling roller 38, and the second clamping assembly 39. The second pressure roller 33 moves toward the second pulling roller 38. The second drive motor 34 drives the second pulling roller 38 to rotate, so that the second pressure roller 33 and the second pulling roller 38 cooperate to convey the PI film. Under the action of the two second clamping assemblies 39, the PI film is kept in an unrolled and relaxed state, thereby ensuring the subsequent winding quality. The second tension sensor 361 detects the tension applied to the second tension detection roller 36 and then adjusts the installation height of the second adjusting roller 32 to adjust the PI film tension to the appropriate state.

[0214] The height adjustment structure of the second adjusting roller 32 is similar to the structure of the above-mentioned first height adjustment mechanism 221, the height adjustment structure of the second pressing roller 33 is similar to the structure of the above-mentioned second height adjustment mechanism 231, and the second clamping assembly 39 is similar to the structure of the first clamping assembly 7. For details, please refer to the first height adjustment mechanism 221, the second height adjustment mechanism 231 and the first clamping assembly 7.

Claims

1. A polyimide film production line, characterized in that, It includes a steel belt casting machine, a peeling transition unit, a transverse stretching machine, a detection unit, an annealing unit and a winding unit arranged in sequence; The steel belt casting machine includes a drying oven, a driving drum mechanism arranged at one end of the drying oven close to the peeling transition unit, a driven drum mechanism arranged at the other end of the drying oven, a waist-shaped steel belt driven by the driving drum mechanism and the driven drum mechanism, an extrusion die head arranged on the driving drum mechanism, and a guiding roller arranged below the extrusion die head; The drying oven includes a frame, an outer heat insulation structure arranged on both sides of the frame, an upper air duct assembly and a lower air duct assembly arranged on the frame, a hot air blower group for providing hot air to the upper air duct assembly and the lower air duct assembly, and a first nitrogen generation assembly; The frame includes a bottom heat insulation layer, a middle-lower heat insulation layer, a middle-upper heat insulation layer, and a top heat insulation layer that are sequentially spaced and parallel to each other from bottom to top; an upper drying channel for the upper straight section of the steel belt to pass through is formed between the top heat insulation layer and the middle-upper heat insulation layer, a lower drying channel for the lower straight section of the steel belt to pass through is formed between the bottom heat insulation layer and the middle-lower heat insulation layer, and an overhead interval is formed between the middle-upper heat insulation layer and the middle-lower heat insulation layer; the first nitrogen generation assembly is used to convey nitrogen to the upper drying channel and the lower drying channel; The transverse stretching machine includes a transverse stretching box body, a conveying system and a second nitrogen generation assembly, and the second nitrogen generation assembly is used to convey nitrogen to the transverse stretching box body.

2. The polyimide film production line according to claim 1, wherein The middle-lower heat insulation layer and the middle-upper heat insulation layer are connected by a plurality of middle-layer support columns, and the bottom heat insulation layer and the middle-lower heat insulation layer are connected by lower support columns; the top heat insulation layer and the middle-upper heat insulation layer are connected by upper support columns; insertion beam lifting lugs for cooperating with longitudinal beams are fixed on the sides of some of the middle-layer support columns; a plurality of lifting rings are arranged on the top surface of the top heat insulation layer.

3. The polyimide film production line according to claim 1 or 2, wherein The upper air duct assembly is arranged at the bottom of the top heat insulation layer, and the lower air duct assembly is arranged at the top of the bottom heat insulation layer; a plurality of upper air duct assemblies are arranged and spaced transversely, an upper concave cavity is formed between adjacent upper air duct assemblies, a sealing plate hanger fixed on the bottom surface of the top heat insulation layer is arranged in each upper concave cavity, and a horizontally placed upper diversion sealing plate is arranged on the sealing plate hanger; a plurality of lower air duct assemblies are arranged and spaced transversely, a lower concave cavity is formed between adjacent lower air duct assemblies, a sealing plate support fixed on the upper surface of the bottom heat insulation layer is arranged in each lower concave cavity, and a horizontally placed lower diversion sealing plate is arranged on the sealing plate support.

4. The polyimide film production line according to claim 3, wherein The sealing plate hanger is screwed to the middle-upper heat insulation layer through a first inner-layer support column; the sealing plate support is screwed to the middle-lower heat insulation layer through a second inner-layer support column.

5. The polyimide film production line according to claim 1 or 2, wherein The outer thermal insulation structure includes an upper thermal insulation layer, a hollow layer, and a lower thermal insulation layer that are spliced and combined from top to bottom. The upper thermal insulation layer is used to seal the upper drying channel, the hollow layer is used to seal the overhead section, and the lower thermal insulation layer is used to seal the lower drying channel. Both the upper thermal insulation layer and the lower thermal insulation layer include a maintenance thermal insulation module, an observation thermal insulation module, and a splicing thermal insulation module. The maintenance thermal insulation module and the observation thermal insulation module can be directly spliced left and right, and two maintenance thermal insulation modules are spliced through the splicing thermal insulation module.

6. The polyimide film production line according to claim 5, wherein the maintenance thermal insulation module is "convex"-shaped in a top-down projection, the observation thermal insulation module is an inverted "convex"-shaped in a top-down projection, and the splicing thermal insulation module is an inverted "convex"-shaped in a top-down projection.

7. The polyimide film production line according to claim 5, wherein the maintenance thermal insulation module includes a thermal insulation outer body with a maintenance opening, an outer thermal insulation door body for closing or opening the maintenance opening, and a thermal insulation inner body disposed inside the thermal insulation outer body and used to fill the maintenance opening; the maintenance opening is a rectangular structure, a handle is provided on the front end face of the thermal insulation inner body, and a plurality of universal balls are provided on the outer wall surface of the thermal insulation inner body.

8. The polyimide film production line according to claim 7, wherein the maintenance opening includes a first cavity, a second cavity, and a third cavity arranged in sequence from inside to outside. The space of the first cavity is smaller than the space of the second cavity, so that a first transition step is formed between the first cavity and the second cavity. The space of the second cavity is smaller than the space of the third cavity, so that a second transition step is formed between the second cavity and the third cavity; the outer thermal insulation door body is disposed in the third cavity, and the thermal insulation inner body is disposed in the second cavity.

9. The polyimide film production line according to claim 5, wherein installation holes are provided on the maintenance thermal insulation module, the observation thermal insulation module, and the splicing thermal insulation module, and threaded holes corresponding to the installation holes are provided on the sides of the bottom thermal insulation layer, the middle and lower thermal insulation layer, the middle and upper thermal insulation layer, and the top thermal insulation layer. Long screws pass through the installation holes and are connected to the threaded holes.

10. The polyimide film production line according to claim 1 or 2, wherein the passive drum mechanism includes a passive drum, two receiving seats respectively rotationally connected to the two end shafts of the passive drum, a guide rail disposed below the receiving seats, and screw jacks corresponding to the number of receiving seats one by one. The lifting bodies of the two screw jacks are fixed by a mounting plate. The input rotating shaft of each screw jack is connected to a corresponding driving mechanism, and the output end of each screw jack is connected to the side of the receiving seat through a pressure sensing assembly; the guide rail extends along the casting direction and is connected to the receiving seat through a slider. The two end shafts of the passive drum are sleeved with self-aligning roller bearings and connected to the corresponding receiving seats.

11. The polyimide film production line according to claim 10, wherein The pressure sensing assembly includes a fixed block, a weighing sensor, and a connecting shaft connected in sequence, the fixed block is fixed on a receiving seat, and the connecting shaft is connected to the output end of the screw lifter; the driving mechanism includes a reducer that is transmission-connected to the input end of the screw lifter, and the input shaft of the reducer is drive-connected to the motor.

12. The polyimide film production line according to claim 11, characterized in that: The input shaft of the reducer has double input ends, one of the input shafts of the reducer is connected to the motor drive, and the other input shaft is connected to the hand wheel.

13. The polyimide film production line according to claim 10, characterized in that: The socket is provided with an oil pipeline for inputting lubricating oil to the spherical roller bearing, and the input end of the oil pipeline is connected to the oil cup; a cooling channel is provided in the passive drum, and a rotary joint is connected between the end shaft of the passive drum and the cooling channel; a magnetostrictive displacement sensor is provided on the side of the guide rail, and the sensing end of the magnetostrictive displacement sensor is connected to the socket.

14. The polyimide film production line according to claim 2, characterized in that: Lower insulation pads are fixedly provided on the top surfaces of both ends of the bottom insulation layer, and each lower insulation pad is connected to the lower and middle insulation layers through lower supporting columns; upper insulation pads are provided on the bottom surfaces of both ends of the top insulation layer, and each upper insulation pad is connected to the upper and middle insulation layers through upper supporting columns.

15. The polyimide film production line according to claim 14, characterized in that: The beam insertion ear comprises a reference mounting plate and a square frame-shaped insertion plate, and one side surface of the insertion plate is welded to the reference mounting plate.

16. The polyimide film production line according to claim 14 or 15, characterized in that: There are four beam-inserting lifting ears, two of which can be inserted by the same longitudinal beam, and the two beam-inserting lifting ears constitute a left lifting ear assembly, and the remaining two beam-inserting lifting ears can be inserted by the same longitudinal beam, and the two beam-inserting lifting ears constitute a right lifting ear assembly. The left lifting ear assembly and the right lifting ear assembly are arranged symmetrically on the left and right.

17. The polyimide film production line according to claim 14, characterized in that: A static pressure box insulation layer is arranged on the middle and lower insulation layer, and casters are arranged on the bottom surface of the middle and lower insulation layer.

18. The polyimide film production line according to claim 14, characterized in that: One end of the middle and lower insulation layer and the middle and upper insulation layer are connected by a first mounting vertical plate, and the other end is connected by a second mounting vertical plate. The sides of the bottom insulation layer, the middle and lower insulation layer, the middle and upper insulation layer and the top insulation layer are provided with a plurality of mounting holes for installing the outer insulation structure.

19. The polyimide film production line according to claim 7, characterized in that: The thermal insulation outer body is provided with a plurality of mounting holes which pass through from front to back, and a long screw is inserted into each mounting hole, and the long screw is threadedly connected to the frame of the steel strip casting machine; thermal insulation cotton is arranged inside the thermal insulation outer body, the thermal insulation inner body and the outer thermal insulation door body; one side of the outer thermal insulation door body is connected to the thermal insulation outer body by a hinge, and the other side is connected to the thermal insulation outer body by a door lock.

20. The polyimide film production line according to claim 8, characterized in that: The rear end face of the inner heat-insulating body abuts against the first transition step to form a seal, and a rectangular sealing strip is enclosed on the second transition step; the inner heat-insulating body is fixedly connected to the inner wall of the outer heat-insulating body through a limit lock.

21. The polyimide film production line according to claim 1, wherein a heating system is provided in the transverse stretching box, an inlet end is provided at one end of the transverse stretching box close to the peeling transition unit, and an outlet end is provided at the other end; the conveying system includes two symmetrically arranged traction mechanisms and amplitude modulation mechanisms, the traction mechanism includes a driven sprocket assembly arranged close to the inlet end, a driving sprocket assembly arranged close to the outlet end, and a chain sleeved on the driving sprocket assembly and the driven sprocket assembly, a plurality of clamping devices for clamping the polyimide film are arranged on the chain, an inner track located inside the transverse stretching box and an outer track located outside the transverse stretching box are arranged between the driving sprocket assembly and the driven sprocket assembly, and a plurality of amplitude modulation mechanisms are arranged in the transverse stretching box at equal intervals, and the inner tracks on the two traction mechanisms are connected to the output ends of the amplitude modulation mechanisms to adjust the distance between the two inner tracks.

22. The polyimide film production line according to claim 21, wherein the transverse stretching machine further includes first protective covers symmetrically arranged on both sides of the transverse stretching box, and the outer track is arranged inside the first protective cover.

23. The polyimide film production line according to claim 21, wherein the driving sprocket assembly includes a first bracket, a first sliding seat slidably arranged on the first bracket, a first transverse translation mechanism arranged on the first bracket, and a first fixed seat arranged on the first bracket, a first movable sprocket is rotatably connected to the first sliding seat, a driving component for driving the first movable sprocket to rotate is arranged between the first sliding seat and the output end of the first transverse translation mechanism, and a first fixed sprocket is rotatably connected to the first fixed seat; one end of the inner track is arranged on the first sliding seat, and one end of the outer track is arranged on the first bracket.

24. The polyimide film production line according to claim 21, wherein the driven sprocket assembly includes a second bracket, a transverse moving plate slidably arranged on the second bracket, a second transverse translation mechanism arranged on the second bracket, a longitudinal moving plate slidably arranged on the transverse moving plate, a longitudinal translation mechanism arranged on the longitudinal moving plate, a second sliding seat arranged at the output end of the longitudinal translation mechanism, and a second fixed seat arranged on the second bracket; the transverse moving plate is connected to the output end of the second transverse translation mechanism, and the translation direction of the longitudinal moving plate is perpendicular to the translation direction of the transverse moving plate; a second movable sprocket is rotatably connected to the second sliding seat, and a second fixed sprocket is rotatably connected to the second fixed seat; the other end of the inner track is arranged on the longitudinal moving plate, and the other end of the outer track is arranged on the second bracket.

25. The polyimide film production line according to claim 24, wherein it further includes a follow-up guiding mechanism, the follow-up guiding mechanism includes a fixed frame rotatably connected to the second fixed seat, a movable frame rotatably connected to the second sliding seat, and a docking track arranged on the fixed frame, a telescopic component is arranged between the docking track and the movable frame, and the docking track is always located on the tangent line of the second fixed sprocket and the second movable sprocket.

26. The polyimide film production line according to claim 25, characterized in that the telescopic assembly includes a fixed block provided on the movable frame, a guide rod with one end provided on the fixed block, and a guide seat provided on the docking track, and the guide rod is slidably connected to the guide seat.

27. The polyimide film production line according to claim 21, characterized in that the amplitude modulation mechanism includes an amplitude modulation track, a width adjustment device and a sliding table. The two ends of the amplitude modulation track are respectively connected to both sides of the horizontal pulling box body. Two sliding tables are slidably arranged on the amplitude modulation track. The output end of the width adjustment device is connected to the two sliding tables to make the two sliding tables move synchronously towards or away from each other. An adjustment seat is provided on the top of each sliding table, and an adjustment groove is opened on the top of the adjustment seat. The length extension direction of the adjustment groove is perpendicular to the translation direction of the sliding table. A positioning column is slidably connected to the adjustment groove, and the positioning column is connected to the inner track.

28. The polyimide film production line according to claim 27, characterized in that the inner track includes a plurality of sequentially spliced track segments, and the positioning column is arranged at the connection position of two adjacent track segments; the adjustment groove is an inverted T-shaped groove, and the lower end of the positioning column is provided with a sliding portion slidably connected to the adjustment groove; an insertion hole matching the sliding portion is provided in the middle of the adjustment groove.

29. The polyimide film production line according to claim 21, characterized in that the heating system sequentially arranges a first heating zone, a second heating zone and a third heating zone along the conveying direction of the polyimide film. The temperature of the second heating zone is higher than that of the first heating zone and the third heating zone. Exhaust mechanisms are provided on the tops of the first heating zone and the third heating zone.

30. The polyimide film production line according to claim 1, characterized in that the conveying system of the horizontal stretching machine includes a sprocket mechanism arranged at the inlet end of the horizontal stretching machine. The sprocket mechanism includes a mounting frame, a first translation mechanism and two sprocket assemblies that move towards or away from each other respectively. The first translation mechanism is arranged on the mounting frame. The sprocket assembly includes a horizontal moving plate arranged at the output end of the first translation mechanism, a longitudinal moving plate slidably arranged on the horizontal moving plate, and a second translation mechanism arranged on the longitudinal moving plate. Two parallel first guide rails are provided on the horizontal moving plate. A first slider slidably connected to the first guide rail is provided at the bottom of the longitudinal moving plate, and the translation direction of the longitudinal moving plate is perpendicular to the translation direction of the horizontal moving plate. The second translation mechanism includes a sliding seat slidably connected to the longitudinal moving plate, and the translation direction of the sliding seat is parallel to the translation direction of the longitudinal moving plate. A sprocket is rotatably connected to the sliding seat. A track is connected to the longitudinal moving plate.

31. The polyimide film production line according to claim 30, characterized in that the first translation mechanism includes two groups of third guide rails respectively arranged on the mounting frame, a driving motor arranged on the mounting frame, and a lead screw rotatably connected to the mounting frame. The horizontal moving plate of each sprocket assembly is slidably arranged on the corresponding third guide rail. The driving motor drives the lead screw to rotate. Two threads with opposite helix directions are provided on the lead screw. A lead screw nut meshing with the lead screw is provided at the bottom of each horizontal moving plate.

32. The polyimide film production line according to claim 30, wherein, The first translation mechanism further includes a displacement sensor disposed on the mounting bracket, and the extending end of the displacement sensor is connected to the lateral moving plate.

33. The polyimide film production line according to claim 31, characterized in that, The first translation mechanism further includes a commutator. The output end of the driving motor is connected to the input end of the commutator, the output end of the commutator is connected to the lead screw, and a connecting rod is further connected to the input end of the commutator. A hand wheel is provided at the end of the connecting rod.

34. The polyimide film production line according to claim 30, wherein The second translation mechanism further includes a second guide rail and a driving cylinder. Two parallel second guide rails are disposed on the longitudinal moving plate. A second slider slidably connected to the second guide rail is provided at the bottom of the sliding seat. The cylinder block of the driving cylinder is hinged to the longitudinal moving plate, and its extending rod is hinged to the sliding seat.

35. The polyimide film production line according to claim 30, wherein Two bearing seats are provided on the sliding seat. Two rotating shafts are respectively rotatably connected to the two bearing seats through bearings, and a sprocket is disposed on the rotating shaft; an oil injection hole is provided in the rotating shaft, and a diversion hole communicating with the oil injection hole is opened on the side wall of the rotating shaft. The diversion hole is used for dripping lubricating oil for the bearing; an upper oil receiving tray located above the sprocket and a lower oil receiving tray located below the sprocket are further provided in the sliding seat.

36. The polyimide film production line according to claim 1, wherein, It further includes a secondary annealing device disposed between the annealing unit and the winding unit. The secondary annealing device includes a first traction device, an annealing furnace, and a second traction device sequentially arranged along the conveying direction of the polyimide film. The annealing furnace includes a plurality of annealing modules arranged in parallel. The annealing module includes a box body, a heating device disposed in the box body, an exhaust device disposed on the box body, and a third nitrogen generation component. An inlet end is provided on one side of the box body, and an outlet end is provided on the other side thereof. The heating device includes a plurality of far-infrared ceramic heating plates, and the third nitrogen generation component is used for conveying nitrogen to the box body.

37. The polyimide film production line according to claim 36, characterized in that, The box body includes an inner layer, an outer layer, and heat-insulating cotton filled between the inner layer and the outer layer. A support block for supporting the heating device is provided in the box body.

38. The polyimide film production line according to claim 37, wherein, The heating device further includes a mounting bracket disposed on the support block. The mounting bracket includes a rectangular frame formed by splicing a plurality of angle irons. A plurality of far-infrared ceramic heating plates are disposed on the top and / or the bottom of the mounting bracket.

39. The polyimide film production line according to claim 36, characterized in that, The exhaust device includes a blower, a main pipe connected to the blower, and a plurality of branch pipes connected to the main pipe. The ends of the plurality of branch pipes extend into the box body and are respectively disposed near the inlet end and the outlet end.

40. The polyimide film production line according to claim 36, wherein, Two baffles are respectively provided at the inlet end and the outlet end. The two baffles are symmetrically arranged up and down and are slidably disposed on the box body up and down.

41. The polyimide film production line according to claim 36, characterized in that, It further includes a corona machine disposed between the annealing furnace and the second traction device.

42. The polyimide film production line according to claim 36, characterized in that, The first traction device includes a first frame, a first adjusting roller slidably arranged vertically on the frame, a first pressing roller slidably arranged vertically on the first frame, and a first driving motor arranged on the first frame. The first frame is sequentially rotatably connected with a first transition roller, a first tension detection roller, a second transition roller, and a first traction roller along the conveying direction of the polyimide film. First tension sensors are respectively arranged at both ends of the first tension detection roller. The first adjusting roller is arranged between the second transition roller and the first traction roller. The output end of the first driving motor is connected to the first traction roller. The first pressing roller and the first traction roller cooperate to convey the polyimide film.

43. The polyimide film production line according to claim 36, wherein, The annealing furnace further includes two first edge clamping assemblies symmetrically arranged at the outlet end. The first edge clamping assembly includes a translation mechanism, an adjusting seat arranged at the output end of the translation mechanism, a lower clamping wheel rotatably connected to the adjusting seat, a first driving cylinder arranged on the adjusting seat, and a connecting rod rotatably connected to the adjusting seat. One end of the connecting rod is hinged to the extending rod of the first driving cylinder, and the other end is rotatably connected with an upper clamping wheel.

44. The polyimide film production line according to claim 36, wherein, The second traction device includes a second frame, a second adjusting roller slidably arranged vertically on the second frame, a second pressing roller slidably arranged vertically on the second frame, a second driving motor arranged on the second frame, and two second edge clamping assemblies symmetrically arranged on the second frame. The second frame is sequentially rotatably connected with a third transition roller, a second tension detection roller, a fourth transition roller, and a second traction roller along the conveying direction of the polyimide film. Second tension sensors are respectively arranged at both ends of the second tension detection roller. The second adjusting roller is arranged between the fourth transition roller and the second traction roller. The output end of the second driving motor is connected to the second traction roller. The second pressing roller and the second traction roller cooperate to convey the polyimide film. The two second edge clamping assemblies are arranged on the downstream side of the second traction roller.

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