Self-adaptive curvature leveling device, automatic unwinding equipment and double-sided coating production line

Abstract

The invention discloses a self-adaptive curvature leveling device, automatic unwinding equipment and a double-sided coating production line, and belongs to the technical field of film leveling devices.The self-adaptive curvature leveling device comprises a fixed seat, a bidirectional threaded rod, two movable seats, two connecting seats, a plurality of arc-shaped steel sheets, a first driving assembly and a second driving assembly; the first moving seat and the second moving seat are arranged at the two opposite ends of the two-way threaded rod correspondingly, a first connecting seat is rotationally arranged on the first moving seat, and a second connecting seat is rotationally arranged on the second moving seat. The multiple arc-shaped steel sheets are connected with the two connecting bases, the first driving assembly is used for driving the leveling roller to rotate in the circumferential direction, and the second driving assembly is used for driving the two-way threaded rod to rotate so as to change the diameter of the middle of the leveling roller. According to the invention, discrete mechanical adjustment is converted into continuous variable curved surface reconstruction by utilizing the continuous elastic deformation capability of the arc-shaped steel sheet, the transverse tension distribution of the thin film is matched in real time, and stepless precise regulation and control of the curvature of the roller surface are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of film flattening devices, and particularly to an adaptive curvature leveling device, an automatic unwinding device, and a double-sided coating production line. Background Art

[0002] Double-sided coating production lines for films are widely used in fields such as lithium battery films, optical films, and flexible packaging films. Its core processes include unwinding, coating, drying, laminating, and winding, etc. During the double-sided coating process, the substrate film needs to be coated twice and cured by high-temperature drying. Due to the combined action of the surface tension of the coating liquid, drying shrinkage, and mechanical traction force, the film is extremely prone to problems such as horizontal or vertical wrinkles and edge warping, especially in the production of high-speed or ultra-thin films. In addition, double-sided coating has extremely high requirements for the flatness of the film. Subtle wrinkles or uneven tension may lead to coating thickness deviation, thereby affecting product performance.

[0003] Currently, drum-shaped flattening rollers and bow-shaped flattening rollers are mainly used in film coating production lines to flatten the film. However, drum-shaped flattening rollers and bow-shaped flattening rollers cannot achieve continuous and precise control of the roller surface curvature, and thus cannot dynamically adapt to different film thicknesses and tension changes, making it difficult to achieve precise and efficient leveling effects, which affects the production quality and yield rate of the film. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides an adaptive curvature leveling device, an automatic unwinding device, and a double-sided coating production line, which can achieve precise compensation for the lateral and longitudinal deformations of the film and improve the flatness of the film.

[0005] According to the first aspect of the present invention, the adaptive curvature leveling device, automatic unwinding equipment and double-sided coating production line include: a fixed seat; a bidirectional threaded rod, the bidirectional threaded rod is rotatably arranged on the fixed seat; a first movable seat and a second movable seat, the first movable seat and the second movable seat are respectively arranged at opposite ends of the bidirectional threaded rod, the first movable seat is connected to the bidirectional threaded rod by a forward thread, and the second movable seat is connected to the bidirectional threaded rod by a reverse thread; a first connecting seat and a second connecting seat, the first connecting seat and the second connecting seat are connected, the first connecting seat is rotatably arranged on the first moving seat, and the second connecting seat is rotatably arranged on the second moving seat; a plurality of arc-shaped steel sheets, A plurality of arc-shaped steel sheets are arranged between the first connecting seat and the second connecting seat, and the plurality of arc-shaped steel sheets, the first connecting seat and the second connecting seat are combined to form a leveling roller, and the bidirectional threaded rod controls the first movable seat and the second movable seat to drive the arc-shaped steel sheets to deform so as to change the diameter of the middle part of the leveling roller; the first drive assembly and the second drive assembly, the first drive assembly and the second drive assembly are both arranged on the fixed seat, and the second connecting seat is located on the side of the first connecting seat away from the first drive assembly, the first drive assembly is transmission-connected with the second connecting seat, the first drive assembly is used to drive the leveling roller to rotate circumferentially, the second drive assembly is transmission-connected with the bidirectional threaded rod, and the second drive assembly is used to drive the bidirectional threaded rod to rotate.

[0006] According to the adaptive curvature leveling device, automatic unwinding equipment and double-sided coating production line of the embodiments of the present invention, there are at least the following beneficial effects: two connecting seats and a plurality of arc-shaped steel sheets uniformly distributed along the circumferential direction enclose a leveling roller. During operation, the second drive component drives the two-way threaded rod to rotate, and drives the moving seats at both ends to move synchronously toward or away from each other through the positive and negative threads, forcing the connecting seat to pull the arc-shaped steel sheet to bend. At this time, the diameter of the middle part of the leveling roller changes with the curvature of the steel sheet, forming a controllable convexity, thereby offsetting the wrinkles caused by uneven tension of the film. At the same time, the first drive component drives the leveling roller to rotate actively to achieve coordinated control of lateral flattening and longitudinal tension balance. Therefore, the continuous elastic deformation capacity of the arc-shaped steel sheet is utilized to convert discrete mechanical adjustments into continuously variable surface reconstruction, matching the lateral tension distribution of the film in real time, thereby achieving stepless and precise control of the curvature of the roller surface.

[0007] According to some embodiments of the present invention, an anti-twist component is further included. The anti-twist component is rotatably disposed on a fixed seat, the anti-twist component is connected to all the arc-shaped steel sheets, and the anti-twist component is used to prevent the arc-shaped steel sheets from circumferentially twisting.

[0008] According to some embodiments of the present invention, the anti-twist assembly includes a plurality of limit plates, which are evenly distributed along the circumference of the leveling roller, and each of the limit plates is provided with a plurality of connecting members along the circumference, and the number of the connecting members corresponds to the number of arc-shaped steel sheets. The limit plates are elastically connected to the corresponding arc-shaped steel sheets through the connecting members, and the connecting members are configured to adapt to the curvature changes of the arc-shaped steel sheets.

[0009] According to some embodiments of the present invention, the connecting member includes: an outer cylinder, which is arranged on the side wall of the limiting plate, and an elastic member is axially arranged inside the outer cylinder; an inner cylinder, one end of the inner cylinder is movably inserted into the outer cylinder through the elastic member, and the other end of the inner cylinder is fixedly connected to the corresponding arc-shaped steel sheet.

[0010] According to some embodiments of the present invention, the first connecting seat is rotatably connected to the arc-shaped steel sheet, and the second connecting seat is rotatably connected to the arc-shaped steel sheet.

[0011] According to some embodiments of the present invention, the first drive component includes: a first drive member, the first drive member is arranged on a fixed seat; a drive shaft, the first drive member is transmission-connected to the drive shaft via a spline connecting shaft, the drive shaft is slidingly connected to the first movable seat and the first connecting seat respectively, the drive shaft sequentially penetrates the first movable seat and the first connecting seat in a direction away from the first drive member, and is transmission-connected to the second connecting seat, and the first drive member drives the second connecting seat to rotate by controlling the drive shaft.

[0012] According to some embodiments of the present invention, a coating is further included, which is arranged on the contact surface between the leveling roller and the film, and the coating is configured to reduce the friction between the steel sheet and the film to improve the leveling accuracy of the film.

[0013] According to some embodiments of the present invention, it also includes a tensioning roller and a floating roller, both of which are arranged on a fixed seat, the tensioning roller, the floating roller and the leveling roller are arranged in sequence along the conveying path of the film, the film is wound around the tensioning roller, the floating roller and the leveling roller in sequence, and the tensioning roller and the floating roller cooperate with each other to adjust the tension of the film.

[0014] According to the second aspect of the present invention, the automatic unwinding device comprises a frame, an unwinding device and an adaptive curvature leveling device, wherein the unwinding device and the adaptive curvature leveling device are sequentially arranged on the frame along the conveying path of the film.

[0015] According to the double-sided coating production line of the third aspect of the embodiment of the present invention, it includes a preheating oven, a first drying box, a surface changing device, a second drying box, an automatic winding device, two coating devices, a winding device and an automatic unwinding device. The automatic unwinding device, the preheating oven, one of the coating devices, the first drying box, the surface changing device, the other coating device, the second drying box and the automatic winding device are arranged in sequence along the conveying path of the film.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 This is a schematic structural diagram of the adaptive curvature leveling device in this specific embodiment; Figure 2 is Figure 1 a schematic structural diagram of the leveling roller in Figure 3 is Figure 2 a schematic structural diagram of the hidden film and the fixing seat in Figure 4 is Figure 2 a schematic cross-sectional view of the leveling roller in

[0018] Reference numerals: Fixing seat 100, tensioning roller 110, floating roller 120; Bidirectional threaded rod 200; First moving seat 300, first connecting seat 310; Second moving seat 400, second connecting seat 410; Arc-shaped steel sheet 500, leveling roller 510; First driving assembly 600, first driving member 610, driving shaft 620, spline connecting shaft 630; Second driving assembly 700; Anti-twist assembly 800, limiting disc 810, connecting member 820, outer cylinder 821, inner cylinder 822; Film 900; Film 10. Detailed implementation manner

[0019] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0020] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is two or more, greater than, less than, exceeding, etc. are understood not to include the original number, and "above", "below", "within", etc. are understood to include the original number. If there is a description of "first", "second", etc., it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0021] In the description of the present invention, unless otherwise clearly defined, words such as “setting”, “installation” and “connection” should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0022] Please refer to Figures 1 to 4 The present embodiment discloses an adaptive curvature leveling device, including a fixed seat 100, a bidirectional threaded rod 200, a first movable seat 300, a second movable seat 400, a first connecting seat 310, a second connecting seat 410, a plurality of arc-shaped steel sheets 500, a first driving assembly 600 and a second driving assembly. The bidirectional threaded rod 200 is rotatably arranged on the fixed seat 100, the first movable seat 300 and the second movable seat 400 are respectively arranged at opposite ends of the bidirectional threaded rod 200, the first movable seat 300 is connected to the bidirectional threaded rod 200 by a forward thread fit, and the second movable seat 400 is connected to the bidirectional threaded rod 200 by a reverse thread fit. The first connecting seat 310 and the second connecting seat 410 are connected, the first connecting seat 310 is rotatably arranged on the first movable seat 300, and the second connecting seat 410 is rotatably arranged on the second movable seat 400. One end of the plurality of arc-shaped steel sheets 500 is connected to the first connection seat 310, and the other end of the plurality of arc-shaped steel sheets 500 is connected to the second connection seat 410. The plurality of arc-shaped steel sheets 500, the first connection seat 310 and the second connection seat 410 enclose a flattening roller 510. The bidirectional threaded rod 200 controls the first movable seat 300 and the second movable seat 400 to drive the arc-shaped steel sheets 500 to deform, thereby changing the diameter of the middle part of the flattening roller 510. The first driving assembly 600 and the second driving assembly 700 are both arranged on the fixed seat 100. The second connection seat 410 is located on the side of the first connection seat 310 away from the first driving assembly 600. The first driving assembly 600 is connected to the second connection seat 410 in a transmission manner. The first driving assembly 600 is used to drive the flattening roller 510 to rotate circumferentially. The second driving assembly 700 is connected to the bidirectional threaded rod 200 in a transmission manner. The second driving assembly 700 is used to drive the bidirectional threaded rod 200 to rotate.

[0023] like Figure 1 , Figure 2 and Figure 3As shown in the figure, a bidirectional threaded rod 200 is provided on the fixed seat 100. The two ends of the bidirectional threaded rod 200 are respectively connected with a first moving seat 300 and a second moving seat 400. The second driving assembly 700 is connected with the bidirectional threaded rod 200. When the second driving assembly 700 drives the bidirectional threaded rod 200 to rotate, the first moving seat 300 and the second moving seat 400 at both ends of the bidirectional threaded rod 200 can approach and move away from each other along the axis. The first connecting seat 310 and the second connecting seat 410 are connected by a plurality of arc-shaped steel sheets 500. The first connecting seat 310, the second connecting seat 410 and a plurality of arc-shaped steel sheets 500 evenly distributed circumferentially enclose a leveling roller 510. The first driving assembly 600 is in transmission connection with the leveling roller 510 to drive the leveling roller 510 to rotate around the axis.

[0024] During operation, the second driving assembly 700 drives the bidirectional threaded rod 200 to rotate, drives the first moving seat 300 and the second moving seat 400 to move synchronously towards or away from each other through positive and reverse threads, and forces the first connecting seat 310 and the second connecting seat 410 to pull the arc-shaped steel sheet 500 to bend. At this time, the diameter of the middle part of the leveling roller 510 changes with the curvature of the steel sheet, forming a controllable convexity, so as to offset the wrinkles caused by uneven tension or drying shrinkage of the film 10. At the same time, the first driving assembly 600 drives the leveling roller 510 to rotate actively to realize the coordinated control of transverse flattening and longitudinal tension balance. Thus, the continuous elastic deformation ability of the arc-shaped steel sheet 500 is used to convert discrete mechanical adjustment into continuous variable surface reconstruction, match the transverse tension distribution of the film 10 in real time, and then realize the stepless and precise control of the roller surface curvature.

[0025] Specifically, both the first connecting seat 310 and the second connecting seat 410 can be divided into two parts. One part is connected to the corresponding moving seat, and the other part is connected to the arc-shaped steel sheet 500. Among them, the first connecting seat 310 is rotatably connected to the first moving seat 300 through a bearing, and the second connecting seat 410 is rotatably connected to the second moving seat 400 through a bearing. The cross-sections of the parts of the first connecting seat 310 and the second connecting seat 410 connected to the arc-shaped steel sheet 500 are both regular polygons, and the number of their side lengths is the same as the number of arc-shaped steel sheets 500.

[0026] Specifically, the second driving assembly 700 drives the bidirectional threaded rod 200 in the way of a servo motor, which will not be further elaborated here.

[0027] In some specific embodiments of the present invention, an anti-twist assembly 800 is further included. The anti-twist assembly 800 is rotatably arranged on the fixed seat 100. The anti-twist assembly 800 is connected to all the arc-shaped steel sheets 500, and the anti-twist assembly 800 is used to prevent the circumferential twist of the arc-shaped steel sheets 500.

[0028] It should be noted that the curved steel sheet 500 may be twisted in the circumferential direction due to centrifugal force, tension fluctuation of the film 10 or mechanical vibration when running at high speed. This twisting will cause phase difference between adjacent steel sheets, destroy the continuity of the roller surface profile, and cause the curvature distribution of the leveling roller 510 to be inaccurate, which will not only fail to eliminate the wrinkles of the film 10, but will also aggravate defects such as transverse ripples or longitudinal stripes. Figure 3 and Figure 4 As shown, an anti-torsion component 800 is provided inside the leveling roller 510. Specifically, the anti-torsion component 800 is fixedly connected to all the arc-shaped steel sheets 500. By rigidly connecting the anti-torsion component 800 to all the arc-shaped steel sheets 500, an axial anti-torsion constraint system is constructed. When the first driving component 600 drives the leveling roller 510 to rotate actively, the anti-torsion component 800 rotates together with the leveling roller 510, and the relative rotation of the arc-shaped steel sheets 500 around the roller axis is prevented by physical limiting, thereby ensuring that each arc-shaped steel sheet 500 always maintains a preset curvature distribution shape.

[0029] In some specific embodiments of the present invention, the anti-twist assembly 800 includes a plurality of limit plates 810, and the plurality of limit plates 810 are evenly distributed along the axial direction of the leveling roller 510. The plurality of limit plates 810 are each provided with a plurality of connecting members 820 along the periphery, and the number of connecting members 820 corresponds to the number of arc-shaped steel sheets 500. The limit plates 810 are elastically connected to the corresponding arc-shaped steel sheets 500 through the connecting members 820, and the connecting members 820 are configured to adapt to the curvature changes of the arc-shaped steel sheets 500.

[0030] like Figure 3 and Figure 4 As shown, the limit plate 810, the first movable seat 300 and the second movable seat 400 are coaxially arranged, and each arc-shaped steel sheet 500 is correspondingly connected through a plurality of connecting pieces 820 arranged on the periphery of the limit plate 810. Specifically, the limit plate 810 serves as an anti-twist reference surface, and its peripheral connecting piece 820 is elastically connected to the corresponding arc-shaped steel sheet 500. When the bidirectional threaded rod 200 drives the first movable seat 300 and the second movable seat 400 to change the curvature of the arc-shaped steel sheet 500, the elastic deformation of the connecting piece 820 can absorb the radial displacement component of the arc-shaped steel sheet 500, and at the same time, the connecting piece 820 strictly limits the relative rotation of each arc-shaped steel sheet 500, thereby effectively suppressing the axial torsion of the steel sheet while retaining the freedom of radial deformation of the arc-shaped steel sheet 500, thereby ensuring the reliability of the anti-twist function and avoiding the interference of the rigid connection on the curvature adjustment accuracy.

[0031] like Figure 3 As shown, in this specific embodiment, one limit plate 810 is provided. Of course, a plurality of limit plates 810 may also be provided. The plurality of limit plates 810 are evenly distributed along the axial direction of the leveling roller 510, and then are adjusted with the axial length corresponding to the leveling roller 510, to ensure that a stable curvature adjustment can be maintained between the plurality of arc-shaped steel sheets 500.

[0032] Specifically, the cross-section of the limiting disc 810 is circular or regular polygon. When the limiting disc 810 is a regular polygon, the number of its side lengths is the same as the number of the arc-shaped steel sheets 500, so as to form a flat connecting surface and stably connect the arc-shaped steel sheets 500 with the limiting disc 810.

[0033] In some specific embodiments of the present invention, the connecting member 820 includes an outer cylinder 821 and an inner cylinder 822. The outer cylinder 821 is arranged on the side wall of the limiting disc 810. An elastic member is axially arranged inside the outer cylinder 821. One end of the inner cylinder 822 passes through the outer cylinder 821 movably through the elastic member, and the other end of the inner cylinder 822 is fixedly connected to the corresponding arc-shaped steel sheet 500.

[0034] As Figure 4 shown, the connecting members 820 are arranged on the outer edge of the limiting disc 810 along the circumferential direction. Each connecting member 820 is arranged along the radial direction of the flattening roller 510. The outer cylinder 821 is fixed on the side wall of the limiting disc 810. A guiding groove is axially formed inside it. One end of the inner cylinder 822 is inserted into the outer cylinder 821 and is elastically connected to the outer cylinder 821 through a compression spring, and the other end is fixedly connected to the corresponding arc-shaped steel sheet 500. When the flattening roller 510 adjusts the curvature, the radial displacement of the arc-shaped steel sheet 500 pushes the inner cylinder 822 to slide inside the outer cylinder 821, compressing the elastic member to balance the deformation stress. When the arc-shaped steel sheet 500 is subjected to a torsional force, circumferential contact friction is generated between the inner cylinder 822 and the outer cylinder 821 to form a torsional stiffness, thereby achieving a high-stiffness connection in the circumferential direction to resist torsion and remaining flexible in the radial direction to adapt to the curvature change of the arc-shaped steel sheet 500, and improving the adaptability of the arc-shaped steel sheet 500 to the production requirements of different material films 10.

[0035] Specifically, the outer cylinder 821 is fixed on the side wall of the limiting disc 810 by welding or bolts, and the inner cylinder 822 is fixed on the inner side of the arc-shaped steel sheet 500 by welding. It should be noted that the stiffness of the elastic member needs to match the deformation force of the steel sheet to ensure that it can buffer the deformation stress and provide sufficient anti-torsion resistance.

[0036] Specifically, the elastic member is a compression spring.

[0037] In some specific embodiments of the present invention, the first connecting seat 310 is rotatably connected to the arc-shaped steel sheet 500, and the second connecting seat 410 is rotatably connected to the arc-shaped steel sheet 500. When the bidirectional threaded rod 200 drives the first moving seat 300 and the second moving seat 400 to axially move, the first connecting seat 310 and the second connecting seat 410 drive the two ends of the arc-shaped steel sheet 500 to generate relative displacement. At this time, the rotational connection enables the arc-shaped steel sheet 500 to freely bend on the premise of keeping the tangential direction of the fixed points with the first connecting seat 310 and the second connecting seat 410 consistent, avoiding local stress concentration caused by rigid connection, and further ensuring that the arc-shaped steel sheet 500 is uniformly stressed during the deformation process, making the curvature change of the leveling roller 510 surface smoother and continuous.

[0038] Specifically, the arc-shaped steel sheet 500 can be connected to the first connecting seat 310 and the second connecting seat 410 through rotational structures such as a pin hinge structure, an angular contact ball bearing group, a cross shaft universal joint structure, etc. The above rotational structures are all common connection structures and will not be further elaborated here.

[0039] In some specific embodiments of the present invention, the first driving assembly 600 includes a first driving member 610 and a driving shaft 620. The first driving member 610 is arranged on the fixed seat 100. The first driving member 610 is in transmission connection with the driving shaft 620 through a spline connecting shaft 630. The driving shaft 620 is slidably connected to the first moving seat 300 and the first connecting seat 310 respectively. The driving shaft 620 sequentially penetrates the first moving seat 300 and the first connecting seat 310 along the direction away from the first driving member 610 and is in transmission connection with the second connecting seat 410. The first driving member 610 drives the second connecting seat 410 to rotate by controlling the driving shaft 620.

[0040] As Figure 1 shown, the first driving member 610 is in transmission connection with the driving shaft 620 through the spline connecting shaft 630. The driving shaft 620 sequentially penetrates the first moving seat 300 and the first connecting seat 310 and then forms a rigid connection with the second connecting seat 410 at the distal end. When the first driving member 610 is started, the driving torque acts on the first connecting seat 310 and the second connecting seat 410 simultaneously, enabling the leveling roller 510 surface formed by the arc-shaped steel sheet 500 to achieve synchronous rotation without slip. It should be further noted that when the bidirectional threaded rod 200 adjusts the positions of the first moving seat 300 and the second moving seat 400, the driving shaft 620 needs to axially slide with the second moving seat 400, and the unique structure of the spline pair can still maintain a stable torque transmission ability during the axial relative movement. The first driving member 610 transmits the torque to the driving shaft 620 through the spline connecting shaft 630, which not only ensures the transmission accuracy but also allows the driving shaft 620 to freely move axially to adapt to the curvature adjustment, thereby ensuring the dynamic balance of the leveling roller 510 surface during high-speed rotation.

[0041] In addition, the drive shaft 620 passes through the limit disk 810 and is movably connected to the limit disk 810. Specifically, several limit grooves are axially provided on a part of the drive shaft 620, corresponding to the limit protrusions on the inner wall of the limit disk 810, and the length of the limit grooves corresponds to the displacement range of the connecting seat 310. Thus, while allowing the drive shaft 620 to slide axially, the circumferential rotational freedom is forcibly locked through the mechanical interference between the limit grooves and the limit protrusions, realizing the precise constraint of the circumferential freedom of the arc-shaped steel sheet 500 of the limit disk 810. Of course, the drive shaft 620 and the limit disk 810 can also be connected through limit guide rails, and the limit guide rails can also limit the circumferential rotational freedom of the limit disk, which will not be elaborated further here.

[0042] Specifically, when the drive shaft 620 passes through the first connecting seat 310, it is supported by a linear bearing to ensure smooth axial sliding, and torque transmission is achieved through flange connection with the second connecting seat 410.

[0043] Specifically, the first driving member 610 is a servo motor, which will not be elaborated further here.

[0044] In some specific embodiments of the present invention, a coating film 900 is further included. The coating film 900 is disposed to cover the contact surface between the leveling roller 510 and the film 10. The coating film 900 is configured to reduce the friction between the steel sheet and the film 10 to improve the leveling accuracy of the film 10. Specifically, the coating film 900 effectively reduces the lateral resistance when the film 10 travels by reducing the friction coefficient of the contact interface with the film 10, so that the film 10 can obtain a uniform flattening force during the leveling process and avoid micro-scratches or electrostatic adsorption caused by friction, solving the problem of friction damage between the film 10 and the arc-shaped steel sheet 500 during high-speed coating.

[0045] Specifically, the coating film 900 is a high-performance polyurethane coating film 900, a polyether ether ketone composite coating film 900 and other composite films with high wear resistance, low friction, high temperature resistance and chemical corrosion resistance, and it can be wound on the entire surface of the leveling roller 510 or can be separately wound on the surface of each arc-shaped steel sheet 500.

[0046] Specifically, limit grooves are circumferentially provided on both the first connecting seat 310 and the second connecting seat 410. A bushing with the coating film 900 is embedded in the limit grooves, and the coating film 900 is connected to the inside of the bushing through interference fit, thereby realizing the fixation of the coating film 900 to the leveling roller 510.

[0047] In some specific embodiments of the present invention, a tension roller 110 and a floating roller 120 are further included. The tension roller 110 and the floating roller 120 are both arranged on the fixed seat 100. The tension roller 110, the floating roller 120 and the flattening roller 510 are arranged in sequence along the conveying path of the film 10. The film 10 is wound around the tension roller 110, the floating roller 120 and the flattening roller 510 in sequence. The tension roller 110 and the floating roller 120 cooperate with each other to adjust the tension of the film 10.

[0048] As Figure 1 shown, the tension roller 110, the floating roller 120 and the flattening roller 510 are arranged in sequence along the conveying path of the film 10. The tension roller 110 applies an accurate initial tension through a servo drive system, while the floating roller 120 is free to displace within a preset range through a pneumatic mechanism. When the length of the film 10 changes due to thermal shrinkage or mechanical stretching, the displacement of the floating roller 120 automatically compensates for this change, suppressing the tension fluctuation within the preset range. Thus, as the terminal execution unit of the tension system, the flattening roller 510 can accurately flatten the film 10 under the action of a stable tension field, so that the film 10 is always in the best stress state during the conveying process. The tension roller 110 and the floating roller 120 are both common rollers in the film 10 processing technology, and will not be further elaborated here.

[0049] This embodiment discloses an automatic unwinding device, including a frame, an unwinding device and an adaptive curvature flattening device. The unwinding device and the adaptive curvature flattening device are arranged on the frame in sequence along the conveying path of the film 10.

[0050] This embodiment discloses a double-sided coating production line, including a preheating oven, a first drying oven, a surface-changing device, a second drying oven, an automatic winding device, two coating devices, a winding device and an automatic unwinding device. The automatic unwinding device, the preheating oven, one of the coating devices, the first drying oven, the surface-changing device, the other coating device, the second drying oven and the automatic winding device are arranged in sequence along the conveying path of the film 10.

[0051] The following illustrates this adaptive curvature flattening device through a specific embodiment. As Figures 1 to 4As shown in the figure, a bidirectional threaded rod 200 is provided on the fixing base 100 in the left-right direction. The two ends of the bidirectional threaded rod 200 are respectively connected with a first moving seat 300 and a second moving seat 400. The second driving component 700 is in transmission connection with the bidirectional threaded rod 200. When the second driving component 700 drives the bidirectional threaded rod 200 to rotate, the first moving seat 300 and the second moving seat 400 can approach and move away from each other along the axis. The first connecting seat 310 and the second connecting seat 410 are connected by a plurality of arc-shaped steel sheets 500. The first connecting seat 310, the second connecting seat 410 and a plurality of arc-shaped steel sheets 500 evenly distributed in the circumferential direction enclose to form a leveling roller 510. Among them, the first driving component 600 is in transmission connection with the driving shaft 620 through a flower connection shaft. The first connecting seat 310 is connected to the driving shaft 620 through a bearing to ensure the axial displacement of the driving shaft 620 during the process of adjusting the curvature of the leveling roller 510. The second connecting seat 410 is in transmission connection with the driving shaft 620 to realize the transmission connection between the driving shaft 620 and the leveling roller 510. Furthermore, the first driving component 600 can drive the leveling roller 510 to rotate around the axis by controlling the driving shaft 620.

[0052] During operation, when the film thickness and tension change dynamically, the built-in control module of the system controls the first driving component 600 to drive the leveling roller 510 to rotate actively, and the second driving component 700 drives the bidirectional threaded rod 200 to rotate. The first moving seat 300 and the second moving seat 400 at both ends are driven to move synchronously towards or away from each other through the left-handed and right-handed threads, forcing the first connecting seat 310 and the second connecting seat 410 to pull the arc-shaped steel sheets 500 to bend. At this time, the diameter of the middle part of the leveling roller 510 changes with the curvature of the steel sheets, forming a controllable convexity, so as to offset the wrinkles caused by uneven tension or drying shrinkage of the film 10. At the same time, the radial displacement of the arc-shaped steel sheets 500 pushes the inner cylinder 822 on the limit disk 810 to slide in the outer cylinder 821, and balances the deformation stress by compressing the compression spring. When the arc-shaped steel sheets 500 are subjected to torsional force, the inner cylinder 822 and the outer cylinder 821 generate circumferential contact friction to form torsional stiffness, and then form a high-stiffness connection in the circumferential direction to resist torsion, and remain flexible in the radial direction to adapt to the curvature change of the arc-shaped steel sheets 500. Thus, this specific embodiment utilizes the continuous elastic deformation ability of the arc-shaped steel sheets 500 to convert discrete mechanical adjustment into continuously variable surface reconstruction, and matches the transverse tension distribution of the film 10 in real time, thereby realizing stepless and precise control of the roller surface curvature.

[0053] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art to which the present invention pertains, various changes can be made without departing from the purpose of the present invention.

Claims

1. An adaptive curvature leveling device, characterized in that, Comprising: Fixed seat; Bidirectional threaded rod, which is rotatably arranged on the fixed seat; First moving seat and second moving seat, the first moving seat and the second moving seat are respectively arranged at opposite ends of the bidirectional threaded rod, the first moving seat is connected to the bidirectional threaded rod through a positive thread fit, and the second moving seat is connected to the bidirectional threaded rod through a reverse thread fit; First connecting seat and second connecting seat, the first connecting seat and the second connecting seat are connected, the first connecting seat is rotatably arranged on the first moving seat, and the second connecting seat is rotatably arranged on the second moving seat; Multiple arc-shaped steel sheets, the multiple arc-shaped steel sheets are arranged between the connection of the first connecting seat and the second connecting seat, the multiple arc-shaped steel sheets, the first connecting seat and the second connecting seat enclose a leveling roller, and the bidirectional threaded rod controls the first moving seat and the second moving seat to drive the arc-shaped steel sheet to deform, so as to change the diameter of the middle part of the leveling roller; First driving component and second driving component, the first driving component and the second driving component are both arranged on the fixed seat, the second connecting seat is located on the side of the first connecting seat away from the first driving component, the first driving component is in transmission connection with the second connecting seat, the first driving component is used to drive the leveling roller to rotate circumferentially, the second driving component is in transmission connection with the bidirectional threaded rod, and the second driving component is used to drive the bidirectional threaded rod to rotate.

2. The adaptive curvature leveling device according to claim 1, characterized in that, It further includes an anti-torsion component, the anti-torsion component is rotatably arranged on the fixed seat, the anti-torsion component is connected to all the arc-shaped steel sheets, and the anti-torsion component is used to prevent the arc-shaped steel sheets from twisting circumferentially.

3. The adaptive curvature leveling device according to claim 2, wherein, The anti-torsion component includes several limiting discs, the several limiting discs are evenly distributed along the axial direction of the leveling roller, several limiting discs are provided with multiple connecting pieces along the circumference, the number of the connecting pieces corresponds to the number of the arc-shaped steel sheets, and the limiting discs are elastically connected to the corresponding arc-shaped steel sheets through the connecting pieces, and the connecting pieces are configured to adapt to the curvature change of the arc-shaped steel sheets.

4. The adaptive curvature leveling device according to claim 3, characterized in that, The connecting piece includes: Outer cylinder, the outer cylinder is arranged on the side wall of the limiting disc, and an elastic member is arranged axially inside the outer cylinder; Inner cylinder, one end of the inner cylinder is movably inserted into the outer cylinder through the elastic member, and the other end of the inner cylinder is fixedly connected to the corresponding arc-shaped steel sheet.

5. The adaptive curvature leveling device according to claim 1, characterized in that, The first connecting seat is rotatably connected to the arc-shaped steel sheet, and the second connecting seat is rotatably connected to the arc-shaped steel sheet.

6. The adaptive curvature leveling device according to claim 1, characterized in that The first driving component includes: First driving member, the first driving member is arranged on the fixed seat; Drive shaft, the first driving member is in transmission connection with the drive shaft through a spline connecting shaft, the drive shaft is slidably connected to the first moving seat and the first connecting seat, the drive shaft sequentially penetrates through the first moving seat and the first connecting seat in the direction away from the first driving member, and is in transmission connection with the second connecting seat, and the first driving member drives the second connecting seat to rotate by controlling the drive shaft.

7. The adaptive curvature leveling device according to claim 1, characterized in that, It further includes a coating film, the coating film is disposed to cover the contact surface between the flattening roller and the film, and the coating film is configured to reduce the friction between the steel sheet and the film so as to improve the flattening accuracy of the film.

8. The adaptive curvature leveling device according to claim 1, wherein It further includes a tension roller and a floating roller, both the tension roller and the floating roller are disposed on the fixed seat, the tension roller, the floating roller and the flattening roller are arranged in sequence along the conveying path of the film, the film is wound around the tension roller, the floating roller and the flattening roller in sequence, and the tension roller and the floating roller cooperate with each other to adjust the tension of the film.

9. Automatic unwinding device, characterized in that, It includes a frame, an unwinding device and the adaptive curvature flattening device according to any one of claims 1 to 8, and the unwinding device and the adaptive curvature flattening device are arranged on the frame in sequence along the conveying path of the film.

10. Double-sided coating production line, characterized in that It includes a preheating oven, a first drying oven, a surface-changing device, a second drying oven, an automatic winding device, two coating devices, a winding device and the automatic unwinding device according to claim 9, and the automatic unwinding device, the preheating oven, one of the coating devices, the first drying oven, the surface-changing device, the other coating device, the second drying oven and the automatic winding device are arranged in sequence along the conveying path of the film.

Images