A film bidirectional synchronous stretching device based on a conjugate curved surface roller set

Abstract

The utility model discloses a kind of film bidirectional synchronous stretching device based on conjugate curved surface roller group, including at least one front auxiliary roller group, one or more conjugate curved surface roller groups and at least one rear auxiliary roller group, each conjugate curved surface roller group includes an upper curved surface roller with concave generatrix and a lower curved surface roller with convex generatrix, the upper curved surface roller with concave generatrix is arranged in parallel with the lower curved surface roller with convex generatrix, and roll surface is conjugated cooperation;Front, rear auxiliary roller group is divided into conjugate curved surface roller group front and rear ends, for tensioning film.The utility model has the advantages of: low failure rate, not only eliminate film edge damage problem, also improve the uniformity of film;Equipment structure is simple, compact, small floor area, low energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of thin film processing technology, specifically to a bidirectional synchronous stretching device for thin films based on conjugate curved surface rollers. Background Technology

[0002] Traditional biaxially oriented film production requires step-by-step longitudinal (MD) and transverse (TD) stretching, with transverse (TD) stretching typically achieved using chain clamps. This traditional biaxially oriented film production method usually suffers from the following drawbacks: cumbersome operation procedures, complex and lengthy equipment structure, high failure rate, large footprint, and high energy consumption; uneven film thickness during stretching, and easy edge damage during transverse stretching. Utility Model Content

[0003] The purpose of this invention is to provide a bidirectional synchronous stretching device for thin films based on conjugate curved surface rollers, in order to solve the technical problems existing in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A film bidirectional synchronous stretching device based on conjugate curved surface roller groups includes one or more conjugate curved surface roller groups, and each conjugate curved surface roller group includes an upper curved surface roller with a concave generatrix and a lower curved surface roller with a convex generatrix. The upper curved surface roller with a concave generatrix and the lower curved surface roller with a convex generatrix corresponding to each conjugate curved surface roller group are arranged parallel to each other on the axis, and the roller surfaces are conjugately fitted. When multiple conjugate curved surface roller groups are included, the multiple conjugate curved surface roller groups are arranged sequentially along the film advancing direction in such a way that the roller length of the later conjugate curved surface roller group is greater than the roller length of the earlier conjugate curved surface roller group.

[0006] Furthermore, the equation for the concave generatrix of the upper curved roller with the concave generatrix is: ,in, It is a monotonically increasing function about the Y-axis direction of the conjugate curved surface roller group spatial coordinate system; The radius corresponding to the center of the upper curved roller with a concave generatrix; For the concave generatrix function of the upper curved surface roller with concave generatrix;

[0007] The equation for the convex generatrix of the lower curved roller with a convex generatrix is: ,in, It is a monotonically increasing function about the Y-axis direction of the conjugate curved surface roller group spatial coordinate system; The radius corresponding to the center of the lower curved roller shaft with a convex generatrix; For a lower curved roller with a convex generatrix, the convex generatrix function is defined.

[0008] The conjugate fit between the upper curved roller with a concave generatrix and the lower curved roller with a convex generatrix satisfies the following: ,in, Let be the gap function between the conjugate generatrices of the upper curved roller with a concave generatrices and the lower curved roller with a convex generatrices, and D be the distance between the axes of the upper curved roller with a concave generatrices and the lower curved roller with a convex generatrices.

[0009] The origin O of the spatial coordinate system of the conjugate curved surface roller group is located at the center of the central gap of the conjugate curved surface roller group. The X-axis direction is the direction of the film's movement within the conjugate curved surface roller group, the Y-axis direction is the axial direction of the conjugate curved surface roller group, and the Z-axis direction is the thickness direction of the film.

[0010] Furthermore, the gap function satisfy ,in, The center gap between the upper curved roller (201) with a concave generatrix and the lower curved roller (202) with a convex generatrix is... It is a constant. It is a nonlinear function and satisfies the derivative. .

[0011] Furthermore, the nonlinear function It can be any one of parabolic, logarithmic, or exponential functions;

[0012] When nonlinear function When it is a parabolic function, ,in, Let be the function coefficients, and ;

[0013] When nonlinear function When ) is a logarithmic function, ,in, , All are function coefficients, and , ;

[0014] When nonlinear function When it is an exponential function, ,in, Let be the function coefficients, and .

[0015] Furthermore, the aforementioned The function form is any one of quadratic function, logarithmic function, exponential function, or B-spline curve; The function can be any one of the following: quadratic function, logarithmic function, exponential function, or B-spline curve.

[0016] Furthermore, the curvature of the upper curved roller with a concave generatrix is ​​less than the curvature of the lower curved roller with a convex generatrix.

[0017] Furthermore, the film bidirectional synchronous stretching device based on conjugate curved surface roller group also includes at least one front auxiliary roller group disposed at the film entry end of the one or more conjugate curved surface roller groups, the front auxiliary roller group including front auxiliary roller A and front auxiliary roller arranged parallel to each other on the axis.

[0018] Furthermore, the film bidirectional synchronous stretching device based on conjugate curved surface roller group also includes at least one rear auxiliary roller group disposed at the film output end of the one or more conjugate curved surface roller groups, the rear auxiliary roller group including rear auxiliary roller A and rear auxiliary roller B arranged parallel to each other on the axis.

[0019] Furthermore, the film bidirectional synchronous stretching device based on conjugate curved surface roller group also includes at least one front auxiliary roller group drive motor group, one or more conjugate curved surface roller group drive motor groups and at least one rear auxiliary roller group drive motor group.

[0020] Among them, the front auxiliary roller group drive motor group includes a front auxiliary roller servo motor A connected to one end of the front auxiliary roller A and used to drive the front auxiliary roller A to rotate, and a front auxiliary roller servo motor B connected to one end of the front auxiliary roller B and used to drive the front auxiliary roller B to rotate.

[0021] The conjugate curved surface roller group drive motor group includes an upper curved surface roller servo motor connected to one end of an upper curved surface roller with a concave generatrix and used to drive the upper curved surface roller with a concave generatrix to rotate, and a lower curved surface roller servo motor connected to one end of a lower curved surface roller with a convex generatrix and used to drive the lower curved surface roller with a convex generatrix to rotate.

[0022] The rear auxiliary roller drive motor group includes a rear auxiliary roller servo motor A connected to one end of the rear auxiliary roller A and used to drive the rear auxiliary roller A to rotate, and a rear auxiliary roller servo motor B connected to one end of the rear auxiliary roller B and used to drive the rear auxiliary roller B to rotate.

[0023] Compared with the prior art, the advantages of this utility model are as follows:

[0024] (1) The chain clamp structure of the traditional two-step stretching method is eliminated, which greatly simplifies the transverse stretching (TD) system, reduces the probability of failure, eliminates the problem of film edge damage, and improves the uniformity of the film.

[0025] (2) The equipment structure is simpler and more compact, occupies less space, and can reduce energy consumption by 20-30%. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the description of the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a top view of a bidirectional synchronous stretching device for thin films based on conjugate curved surface rollers, according to an embodiment of the present invention, which has a single conjugate curved surface roller group.

[0028] Figure 2 yes Figure 1 A front view of an embodiment of a film bidirectional synchronous stretching device based on conjugate curved surface rollers involved in the present invention;

[0029] Figure 3 yes Figure 1 A top view of the embodiment of the film bidirectional synchronous stretching device based on conjugate curved surface roller group in the bidirectional synchronous stretching working state of the film.

[0030] Figure 4 yes Figure 1 A front view of the embodiment of the film bidirectional synchronous stretching device based on conjugate curved surface roller group in the working state of film bidirectional synchronous stretching.

[0031] Figure 5 yes Figure 1 A partial three-dimensional structural diagram of the film bidirectional synchronous stretching device based on conjugate curved surface roller group in the working state of film bidirectional synchronous stretching;

[0032] Figure 6 This is a top plan view of a film bidirectional synchronous stretching device based on conjugate curved surface roller groups according to an embodiment of the present invention, which has multiple conjugate curved surface roller groups.

[0033] Figure 7 yes Figure 6 A front view of an embodiment of a film bidirectional synchronous stretching device based on conjugate curved surface rollers involved in the present invention;

[0034] Figure 8 yes Figure 6 A top view of the embodiment of the film bidirectional synchronous stretching device based on conjugate curved surface roller group in the bidirectional synchronous stretching working state of the film.

[0035] Figure 9 yes Figure 6 A front view of the embodiment of the film bidirectional synchronous stretching device based on conjugate curved surface roller group in the working state of film bidirectional synchronous stretching.

[0036] Figure 10 yes Figure 6 A partial three-dimensional structural diagram of the film bidirectional synchronous stretching device based on conjugate curved surface roller group in the working state of film bidirectional synchronous stretching;

[0037] Figure 11 This is a top-view schematic diagram of a conjugate curved surface roller assembly;

[0038] Explanation of reference numerals in the attached drawings: 100, Front auxiliary roller group; 101, Front auxiliary roller A; 102, Front auxiliary roller B; 103, Front auxiliary roller bearing housing; 200, Conjugate curved surface roller group; 201, Upper curved surface roller; 202, Lower curved surface roller; 203, Conjugate curved surface roller bearing housing; 300, Rear auxiliary roller group; 301, Rear auxiliary roller A; 302, Rear auxiliary roller B; 303, Rear auxiliary roller bearing housing; 400, Front auxiliary roller group drive motor group; 401, Front auxiliary roller servo motor A; 402, Front auxiliary roller servo motor B; 500, Conjugate curved surface roller group drive motor group; 501, Upper curved surface roller servo motor; 502, Lower curved surface roller servo motor; 600, Rear auxiliary roller group drive motor group; 601, Rear auxiliary roller servo motor A; 602, Rear auxiliary roller servo motor B; 700, Cast film; 800, Diaphragm. Detailed Implementation

[0039] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with the accompanying drawings and specific embodiments, further explains how this utility model is implemented.

[0040] Example 1: See Figures 1 to 5 This invention provides an embodiment of a film bidirectional synchronous stretching device based on a conjugate curved surface roller group, comprising a conjugate curved surface roller group 200, wherein the conjugate curved surface roller group 200 includes an upper curved surface roller 201 with a concave generatrix and a lower curved surface roller 202 with a convex generatrix. The upper curved surface roller 201 with the concave generatrix and the lower curved surface roller 202 with the convex generatrix are arranged parallel to each other on the axis, and the roller surfaces are conjugately fitted.

[0041] Specifically, in this embodiment 1, the equation of the concave generatrix of the upper curved roller 201 with the concave generatrix is: ,in, It is a monotonically increasing function about the Y-axis direction of the conjugate curved surface roller group spatial coordinate system; For the radius corresponding to the center of the upper curved roller 201 with a concave generatrix, refer to... Figure 11 As shown; This is the concave generatrix function (i.e., the mathematical expression of the concave generatrix) of the upper curved roller (201) with a concave generatrix. It should be noted here that... The function graph corresponds to the concave generatrix shape of the upper curved roller 201 with a concave generatrix.

[0042] Specifically, in this embodiment 1, the equation of the convex generatrix of the lower curved roller 202 with the convex generatrix is: ,in, It is a monotonically increasing function about the Y-axis direction of the conjugate curved surface roller group spatial coordinate system; For the radius corresponding to the center of the lower curved roller 202 with a convex generatrix, refer to... Figure 11 As shown; This is the convex generatrix function (i.e., the mathematical expression of the convex generatrix) for the lower curved roller 202 with a convex generatrix. It should be noted here that... The function graph corresponds to the concave generatrix shape of the lower curved roller 202 with a convex generatrix.

[0043] Specifically, in this embodiment 1, see... Figure 1 , Figure 2 , Figure 5 and Figure 11 The origin O of the spatial coordinate system of the conjugate curved surface roller group is at the center gap of the 200 conjugate curved surface roller group. At the center, the X-axis direction is the forward direction of the film within the conjugate curved roller group 200, the Y-axis direction is the axial direction of the conjugate curved roller group 200, and the Z-axis direction is the film thickness direction.

[0044] Specifically, in this embodiment 1, the conjugate fit relationship between the upper curved roller 201 with a concave generatrix and the lower curved roller 202 with a convex generatrix satisfies: ,in, Let D be the gap function between the conjugate generatrices of the upper curved roller 201 with a concave generatrix and the lower curved roller 202 with a convex generatrix, and D be the distance between the axes of the upper curved roller 201 with a concave generatrix and the lower curved roller 202 with a convex generatrix. (See reference...) Figure 11 As shown.

[0045] Specifically, in this embodiment 1, the gap function satisfy ,in, The center gap between the upper curved roller 201 with a concave generatrix and the lower curved roller 202 with a convex generatrix is ​​shown in the figure. Figure 11 As shown, It is a constant. It is a nonlinear function and satisfies the derivative. .

[0046] Specifically, in this invention, the nonlinear function It can be any one of the following: parabolic function (i.e., quadratic function), logarithmic function, or exponential function;

[0047] When nonlinear function When it is a parabolic function, ,in, Let be the function coefficients, and ;

[0048] When nonlinear function When ) is a logarithmic function, ,in, , All are function coefficients, and , ;

[0049] When nonlinear function When it is an exponential function, ,in, Let be the function coefficients, and .

[0050] Furthermore, in an alternative implementation, the nonlinear function It is a parabolic function, that is Then the corresponding gap function It is parabolic and satisfies ,in, .

[0051] Specifically, in this embodiment 1, The function can be any one of the following: quadratic function, logarithmic function, exponential function, or B-spline curve; The function can be any one of the following: quadratic function, logarithmic function, exponential function, or B-spline curve.

[0052] It should be noted here that, , The function forms can be the same, for example: , The functions are all quadratic functions, logarithmic functions, exponential functions, or B-spline curves; , The function form can also be different, for example: The function is a quadratic function. The function form is a logarithmic function; The function form is a logarithmic function. The function form is an exponential function.

[0053] Furthermore, it should be noted that in this invention, the generatrix function forms of the upper curved roller 201 with a concave generatrix and the lower curved roller 202 with a convex generatrix in the conjugate curved roller group 200 are directly related to the film material to be processed and the process parameters, i.e., constrained by the film material and process parameters. Since different film materials have different rheological properties, their processing requirements differ. To ensure that the film bidirectional synchronous stretching device based on the conjugate curved roller group provided by this invention can cover the processing needs of all film materials as much as possible, the generatrix shapes of the upper curved roller 201 and the lower curved roller 202 must change accordingly. That is, when processing different film materials or setting different process parameters, the generatrix function forms of the upper curved roller 201 and the lower curved roller 202 will change accordingly. , The functional form will vary depending on the thin film material being processed; the generatrices of the upper curved roller 201 and the lower curved roller 202 , The form is from , The functional form is determined by this. Furthermore, the gap function between the conjugate generatrices of the upper curved roller 201 and the lower curved roller 202... satisfy The relationship, therefore, the gap function The functional form is also derived from , The function form is determined by this.

[0054] Furthermore, in one alternative implementation, The function form is a quadratic function, for example ,in are function coefficients and Then the corresponding generatrix function of the upper curved roller 201 It is parabolic. More specifically, .

[0055] Furthermore, in one alternative implementation, The function form is a logarithmic function, for example ,in All are function coefficients and Then the corresponding generatrix function of the lower curved roller 202 It is a logarithmic type. More specifically, , .

[0056] Furthermore, in an alternative embodiment, the curvature of the generatrix of the upper curved roller 201 with a concave generatrix is ​​less than the curvature of the generatrix of the lower curved roller 202 with a convex generatrix. This arrangement facilitates smooth lateral stretching of the film, reducing deformation and stress concentration in the film material.

[0057] For details, please continue reading Figure 1 and Figure 4 The bidirectional synchronous stretching device for thin films based on conjugate curved surface roller groups provided in Embodiment 1 further includes a front auxiliary roller group 100 disposed at the film inlet end of the conjugate curved surface roller group 200, used to tension the cast sheet 700 fed into the conjugate curved surface roller group 200. More specifically, the front auxiliary roller group 100 includes a front auxiliary roller A101 and a front auxiliary roller B102 arranged parallel to each other on the axis.

[0058] Furthermore, in one alternative implementation, please refer to... Figure 2 and Figure 4 The installation position of the front auxiliary roller A101 is lower than that of the front auxiliary roller B102, while the installation position of the front auxiliary roller B102 is higher than that of the conjugate curved roller group 200. The purpose of this arrangement of the front auxiliary rollers A101 and B102 is to ensure that the cast sheet 700 (i.e., the film material that has not undergone longitudinal and transverse stretching from the extruder) forms a suitable wrap angle with the front auxiliary roller group 100, thereby ensuring sufficient friction between the front auxiliary roller group 100 and the cast sheet 700 to prevent slippage.

[0059] For details, please continue reading Figure 1 and Figure 4 The bidirectional synchronous stretching device for thin films based on conjugate curved surface roller groups provided in Embodiment 1 further includes a rear auxiliary roller group 300 disposed at the thin film output end of the conjugate curved surface roller group 200, used to tension the film 800 (i.e., the thin film material after longitudinal and transverse stretching by the conjugate curved surface roller group 200) exiting from the conjugate curved surface roller group 200. More specifically, the rear auxiliary roller group 300 includes a rear auxiliary roller A301 and a rear auxiliary roller B302 arranged parallel to each other on the axis.

[0060] Furthermore, in one alternative implementation, please refer to... Figure 2 and Figure 4 The rear auxiliary roller A301 is installed lower than the conjugate curved surface roller group 200, while the rear auxiliary roller B302 is installed higher than the rear auxiliary roller A301. This arrangement of the rear auxiliary rollers A301 and B302 aims to create a suitable wrap angle between the diaphragm 800 of the conjugate curved surface roller group 200 and the rear auxiliary roller group 300, ensuring sufficient friction between them to prevent slippage.

[0061] For details, please continue reading Figure 1 The film bidirectional synchronous stretching device based on conjugate curved surface roller group provided in this embodiment 1 also includes a front auxiliary roller group drive motor group 400, a conjugate curved surface roller group drive motor group 500 and a rear auxiliary roller group drive motor group 600.

[0062] The front auxiliary roller group drive motor group 400 includes a front auxiliary roller servo motor A401 connected to one end of the front auxiliary roller A101 and used to drive the front auxiliary roller A101 to rotate, and a front auxiliary roller servo motor B402 connected to one end of the front auxiliary roller B102 and used to drive the front auxiliary roller B102 to rotate.

[0063] The conjugate curved roller group drive motor group 500 includes an upper curved roller servo motor 501 connected to one end of the upper curved roller 201 with a concave generatrix and used to drive the upper curved roller 201 with a concave generatrix to rotate, and a lower curved roller servo motor 502 connected to one end of the lower curved roller 202 with a convex generatrix and used to drive the lower curved roller 202 with a convex generatrix to rotate.

[0064] The rear auxiliary roller drive motor group 600 includes a rear auxiliary roller servo motor A601 connected to one end of the rear auxiliary roller A301 and used to drive the rear auxiliary roller A301 to rotate, and a rear auxiliary roller servo motor B602 connected to one end of the rear auxiliary roller B302 and used to drive the rear auxiliary roller B302 to rotate.

[0065] Among them, the front auxiliary roller servo motor A401, the front auxiliary roller servo motor B402, the upper curved surface roller servo motor 501, the lower curved surface roller servo motor 502, the rear auxiliary roller servo motor A601, and the rear auxiliary roller servo motor B602 each operate independently.

[0066] Furthermore, in one alternative implementation, please refer to... Figure 1 The two ends of the front auxiliary rollers A101 and B102 are respectively supported on a front auxiliary roller bearing seat 103, and one end of the front auxiliary rollers A101 and B102 is respectively connected to the front auxiliary roller servo motors A401 and B402.

[0067] Furthermore, in one alternative implementation, please refer to... Figure 1 The upper curved roller 201 with a concave generatrix and the lower curved roller 202 with a convex generatrix are respectively supported on a conjugate curved roller bearing seat 203 at both ends. One end of the upper curved roller 201 with a concave generatrix and the lower curved roller 202 with a convex generatrix are respectively connected to the upper curved roller servo motor A501 and the lower curved roller servo motor B502.

[0068] Furthermore, in one alternative implementation, please refer to... Figure 1 The two ends of the rear auxiliary rollers A301 and B302 are respectively supported on a rear auxiliary roller bearing seat 303, and one end of the rear auxiliary rollers A301 and B302 is respectively connected to the rear auxiliary roller servo motors A601 and B602.

[0069] Example 2: See Figures 6 to 10 This invention provides another embodiment of the film bidirectional synchronous stretching device based on conjugate curved surface roller groups. The difference between this embodiment 2 and embodiment 1 is that: (1) it includes two conjugate curved surface roller groups 200, and the two conjugate curved surface roller groups 200 are arranged sequentially along the film forward direction in such a way that the roll length of the rear conjugate curved surface roller group 200 is greater than the roll length of the front conjugate curved surface roller group 200; (2) the front auxiliary roller group 100 is arranged at the film entry end of the two conjugate curved surface roller groups 200, and the rear auxiliary roller group 300 is arranged at the film output end of the two conjugate curved surface roller groups 200, and the roll length of the rear auxiliary roller group 300 is equivalent to the roll length of the rear conjugate curved surface roller group 200; (3) embodiment 1 can only realize the single-stage film bidirectional synchronous stretching function, while this embodiment 2 can realize multi-stage film bidirectional synchronous stretching. Compared with embodiment 1, this embodiment 2 can make the film wider laterally.

[0070] It is understood here that the number of conjugate curved surface roller groups 200 in the film bidirectional synchronous stretching device based on conjugate curved surface roller groups provided by this utility model can be set according to actual needs, that is, according to different transverse widening requirements of the film; each additional conjugate curved surface roller group 200 will increase the transverse width of the film by a certain amount compared to the original transverse width of the film, see reference. Figure 8 As shown.

[0071] Specifically, the working principle of the film bidirectional synchronous stretching device based on conjugate curved surface roller group provided by this utility model is as follows:

[0072] In use, the cast sheet 700 (i.e., the thin die material from the extruder) is first manually passed around the front auxiliary rollers A101 and B102 of the front auxiliary roller group 100. Then, it is fed into the gap between the upper curved roller 201 with a concave generatrix and the lower curved roller 202 with a convex generatrix of the conjugate curved roller group 200. Then, the front auxiliary roller group 100 and the conjugate curved roller group 200 are started to rotate. By utilizing the speed difference between the upper curved roller 201 and the lower curved roller 202 in the conjugate curved roller group 200, the longitudinal (i.e., the length direction of the cast sheet) stretching of the cast sheet 700 is achieved. At the same time, the conjugate curved rollers are used to stretch the cast sheet 700. The gradient distribution of the gap between the upper curved roller 201 and the lower curved roller 202 in group 200 enables the transverse (i.e., the width direction of the cast sheet) stretching of the cast sheet 700. Then, the film 800 (i.e., the film material after longitudinal and transverse stretching) coming out of the conjugate curved roller group 200 is manually passed around the rear auxiliary roller A301 and rear auxiliary roller B302 in the rear auxiliary roller group 300, and then wound onto the subsequent film take-up roller (not shown in the figure). Finally, the rear auxiliary roller group 300 and the film take-up roller are started to rotate, and the film 800 coming out of the conjugate curved roller group 200 is wound onto the film take-up roller.

[0073] To clarify, in practical applications, the film bidirectional synchronous stretching device based on conjugate curved surface roller group provided by this utility model is specifically set between film extrusion molding equipment (such as extruder) and film winding equipment (such as film winding roller).

[0074] Furthermore, it should be noted that the "front conjugate curved surface roller group 200" and "rear conjugate curved surface roller group 200" described in this utility model are based on the film's forward direction. That is, the front and rear position relationships of multiple conjugate curved surface roller groups 200 are distinguished by the location of the front and rear auxiliary roller groups. Specifically, the conjugate curved surface roller group 200 closer to the front auxiliary roller group 100 is the front conjugate curved surface roller group 200, and the conjugate curved surface roller group 200 closer to the rear auxiliary roller group 300 is the rear conjugate curved surface roller group 200.

[0075] Finally, it should be noted that the above description is only an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A film bidirectional synchronous stretching device based on conjugate curved surface rollers, characterized in that, The system includes one or more conjugate curved roller groups (200), and each conjugate curved roller group (200) includes an upper curved roller (201) with a concave generatrix and a lower curved roller (202) with a convex generatrix. The upper curved roller (201) with a concave generatrix and the lower curved roller (202) with a convex generatrix corresponding to each conjugate curved roller group (200) are arranged parallel to each other on the axis and the roller surfaces are conjugately fitted. When multiple conjugate curved roller groups (200) are included, the multiple conjugate curved roller groups (200) are arranged sequentially along the film advancing direction in such a way that the roller length of the later conjugate curved roller group (200) is greater than the roller length of the earlier conjugate curved roller group (200).

2. The film bidirectional synchronous stretching device based on conjugate curved surface roller group according to claim 1, characterized in that, The equation for the concave generatrix of the upper curved roller (201) with the concave generatrix is: ,in, It is a monotonically increasing function about the Y-axis direction of the conjugate curved surface roller group spatial coordinate system; The radius corresponding to the axis of the upper curved roller (201) with a concave generatrix; The concave generatrix function of the upper curved roller (201) with a concave generatrix; The equation for the convex generatrix of the lower curved roller (202) with the convex generatrix is: ,in, It is a monotonically increasing function about the Y-axis direction of the conjugate curved surface roller group spatial coordinate system; The radius corresponding to the axis of the lower curved roller (202) with a convex generatrix; For the convex generatrix function of the lower curved roller (202) with convex generatrix; The conjugate fit relationship between the upper curved roller (201) with a concave generatrix and the lower curved roller (202) with a convex generatrix satisfies: ,in, Let D be the gap function between the conjugate generatrices of the upper curved roller (201) with a concave generatrices and the lower curved roller (202) with a convex generatrices, and let D be the distance between the axes of the upper curved roller (201) with a concave generatrices and the lower curved roller (202) with a convex generatrices. The origin O of the spatial coordinate system of the conjugate curved roller group is located at the center of the central gap of the conjugate curved roller group (200). The X-axis direction is the forward direction of the film within the conjugate curved roller group (200), the Y-axis direction is the axial direction of the conjugate curved roller group (200), and the Z-axis direction is the thickness direction of the film.

3. The film bidirectional synchronous stretching device based on conjugate curved surface roller group according to claim 2, characterized in that, The gap function satisfy ,in, The center gap between the upper curved roller (201) with a concave generatrix and the lower curved roller (202) with a convex generatrix is... It is a constant. It is a nonlinear function and satisfies the derivative. .

4. The film bidirectional synchronous stretching device based on conjugate curved surface roller group according to claim 3, characterized in that, The nonlinear function It can be any one of parabolic, logarithmic, or exponential functions; When nonlinear function When it is a parabolic function, ,in, Let be the function coefficients, and ; When nonlinear function When ) is a logarithmic function, ,in, , All are function coefficients, and , ; When nonlinear function When it is an exponential function, ,in, Let be the function coefficients, and .

5. The film bidirectional synchronous stretching device based on conjugate curved surface roller group according to claim 2, characterized in that, The The function form is any one of quadratic function, logarithmic function, exponential function, or B-spline curve; The function can be any one of the following: quadratic function, logarithmic function, exponential function, or B-spline curve.

6. The film bidirectional synchronous stretching device based on conjugate curved surface roller group according to claim 1, characterized in that, The curvature of the upper curved roller (201) with a concave generatrix is ​​less than that of the lower curved roller (202) with a convex generatrix.

7. The film bidirectional synchronous stretching device based on conjugate curved surface roller group according to any one of claims 1 to 6, characterized in that, It also includes at least one front auxiliary roller group (100) disposed at the film entry end of the one or more conjugate curved roller groups (200), the front auxiliary roller group (100) including front auxiliary roller A (101) and front auxiliary roller B (102) disposed parallel to each other on the axis.

8. The film bidirectional synchronous stretching device based on conjugate curved surface roller group according to claim 7, characterized in that, It also includes at least one rear auxiliary roller group (300) disposed at the film output end of the one or more conjugate curved roller groups (200), the rear auxiliary roller group (300) including rear auxiliary roller A (301) and rear auxiliary roller B (302) arranged parallel to each other on the axis.

9. The film bidirectional synchronous stretching device based on conjugate curved surface roller group according to claim 8, characterized in that, It also includes at least one front auxiliary roller group drive motor group (400), one or more conjugate curved surface roller group drive motor groups (500) and at least one rear auxiliary roller group drive motor group (600). The front auxiliary roller drive motor assembly (400) includes a front auxiliary roller servo motor A (401) connected to one end of the front auxiliary roller A (101) and used to drive the front auxiliary roller A (101) to rotate, and a front auxiliary roller servo motor B (402) connected to one end of the front auxiliary roller B (102) and used to drive the front auxiliary roller B (102) to rotate. The conjugate curved roller group drive motor group (500) includes an upper curved roller servo motor (501) connected to one end of the upper curved roller (201) with a concave generatrix and used to drive the upper curved roller (201) with a concave generatrix to rotate, and a lower curved roller servo motor (502) connected to one end of the lower curved roller (202) with a convex generatrix and used to drive the lower curved roller (202) with a convex generatrix to rotate. The rear auxiliary roller drive motor assembly (600) includes a rear auxiliary roller servo motor A (601) connected to one end of the rear auxiliary roller A (301) and used to drive the rear auxiliary roller A (301) to rotate, and a rear auxiliary roller servo motor B (602) connected to one end of the rear auxiliary roller B (302) and used to drive the rear auxiliary roller B (302) to rotate.

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