A film roll unwinding device

Abstract

This application relates to the field of film unwinding technology, and more particularly to a film roll unwinding device, including side plates, two side plates, an unwinding roller disposed between the two side plates, and the two unwinding rollers rotatably connected to the side plates. One end of one of the unwinding rollers is provided with a mounting shaft for an external transmission structure. A mounting rod is provided below the unwinding roller, and a stabilizing roller for stabilizing the film roll is disposed on the mounting rod. At least one set of leveling rollers is provided along the unwinding direction of the film roll, and a leveler is disposed below the leveling rollers. Therefore, a film roll unwinding device can solve the technical problem that existing film rolls are prone to axial displacement due to inertia, manifested as obvious left and right swaying, and that insufficient tension control accuracy leads to uneven unwinding.

Description

Technical Field

[0001] This application relates to the field of film unwinding technology, and more specifically, to a film unwinding device. Background Technology

[0002] Against the backdrop of the rapid development of the consumer electronics industry, the market demand for mobile phone roll films continues to rise. These roll materials require continuous feeding via an unwinding machine during processing, and the stability of the unwinding directly affects the processing accuracy of subsequent processes such as lamination and die-cutting. However, traditional mobile phone roll film unwinding machines face two major technical bottlenecks in actual operation.

[0003] Axial sway of the coiled material is a significant problem. Existing unwinding machines often employ a single-sided air shaft or a simple support structure. During high-speed unwinding, the coil is prone to axial displacement due to inertia, manifesting as noticeable lateral swaying. This is especially pronounced in the later stages when the coil diameter gradually decreases, as the shift in the center of gravity further exacerbates the sway, causing the unwinding path to deviate significantly from the theoretical trajectory. This sway not only directly causes wrinkles at the coil edges but can also lead to film breakage due to excessive stretching, and even unplanned equipment downtime, severely impacting production continuity.

[0004] Insufficient tension control precision leads to uneven unwinding. Traditional unwinding machines generally use friction plates or magnetic powder brakes for tension control. These passive adjustment methods have inherent defects such as response lag and low adjustment precision. When parameters such as roll diameter and unwinding speed change dynamically, the tension control system struggles to match process requirements in real time, resulting in fluctuations in unwinding tension. Specifically, the film layer sometimes becomes loose, causing accumulated wrinkles, and sometimes becomes taut, leading to stretching deformation. Interlayer slippage occurs frequently, severely restricting the yield of downstream processing steps. Utility Model Content

[0005] Based on the above problems, this application proposes a film roll unwinding device to solve the technical problem that existing rolls are prone to axial displacement due to inertia, which manifests as obvious left and right swaying, and uneven unwinding due to insufficient tension control accuracy.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A film roll unwinding device includes two side plates, an unwinding roller is disposed between the two side plates, the two unwinding rollers are rotatably connected to the side plates, one end of one of the unwinding rollers is provided with a mounting shaft for an external transmission structure, a mounting rod is disposed below the unwinding roller, a stabilizing roller for stabilizing the film roll is disposed on the mounting rod, at least one set of leveling rollers is disposed along the unwinding direction of the film roll, and a leveler is disposed below the leveling rollers.

[0008] In one specific implementation, the two side panels are arranged symmetrically.

[0009] In one specific implementation, two stabilizing rollers are provided, which are respectively disposed on both sides of the roll film and abut against each other between the roll film, and the stabilizing rollers are rotatably connected to the mounting rod.

[0010] In one specific implementation, the two ends of each of the leveling rollers are rotatably connected to the side plate, and the open film roll is crisscrossed and passed between each of the stabilizing rollers.

[0011] In one specific implementation, the leveler includes a mounting frame, a first roller mounted on the mounting frame, the first roller being rotatably connected to the mounting frame, and an eliminater for eliminating wrinkles mounted on the mounting frame.

[0012] In one specific implementation, the eliminator includes a telescopic rod mounted on a mounting frame, the telescopic rod being prestressed, a mounting seat being mounted on the telescopic rod, a second roller being mounted on the mounting seat via a connecting rod, the mounting seat and the connecting rod being connected via a connecting seat, and the two ends of the connecting seat being hinged to the connecting rod and the mounting seat.

[0013] In one specific implementation, the mounting frame is provided with a limiting block, the limiting block is connected to the mounting frame by an elastic element with appropriate prestress, and the limiting block is movably connected to the connecting rod.

[0014] The positive effects of this utility model are:

[0015] By symmetrically distributing stabilizing rollers on both sides of the roll material, physical restraint is achieved through the frictional resistance between the roller surface and the roll material. When the roll material tends to shift axially due to inertia, the abutting action of the stabilizing rollers effectively counteracts the swaying moment. Compared to traditional single-sided support structures, the symmetrical dual-roller design results in a more balanced distribution of sway suppression force.

[0016] The membrane material is wound in a crisscross pattern between the leveling rollers, creating multi-directional constraints by altering the direction of the membrane material. This path design balances the centrifugal force during high-speed operation, reduces the tendency to wobble caused by uneven force on one side, and extends the contact length between the membrane material and the roller surface, enhancing the system's damping effect against wobble.

[0017] The limiting block in the eliminator is connected to the mounting bracket via an elastic element, forming a flexible limiting boundary. When the roll material sways slightly due to a sudden disturbance, the elastic element can absorb the impact energy.

[0018] The telescopic rod in the tension eliminator is prestressed and drives the axial displacement of the second roller by real-time monitoring of unwinding speed and roll diameter changes. When the system detects tension fluctuations, the telescopic rod quickly adjusts the position of the second roller, changing the film wrap angle and frictional resistance to achieve closed-loop tension control. Compared to traditional passive brakes, this mechanism has improved response speed and reduced the range of tension fluctuation suppression, ensuring that the film layer is always in an optimal tension state.

[0019] The first roller on the mounting frame and the wrinkle eliminator constitute a wrinkle treatment unit. When wrinkles occur in the membrane material due to a sudden change in tension, the second roller, driven by a telescopic rod, applies localized reverse tension to the wrinkled area. Combined with the flattening effect of the first roller, this achieves online wrinkle elimination and prevents defects from being passed on to subsequent processes. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a structural schematic diagram of a portion of the present utility model;

[0023] Explanation of reference numerals in the attached figures

[0024] 1. Side plate; 2. Unwinding roll; 3. Mounting shaft; 4. Mounting rod; 5. Stabilizing roll; 6. Leveling roll; 7. Mounting frame; 8. First roll; 9. Second roll; 10. Telescopic rod; 11. Mounting seat; 12. Connecting rod; 13. Connecting seat; 14. Limiting block. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Example 1

[0027] like Figure 1-2As shown, this embodiment provides a film roll unwinding device, including two symmetrically arranged side plates 1. Two unwinding rollers 2 are rotatably connected between the two side plates 1. One end of one unwinding roller 2 extends out of the side plate 1 and forms a mounting shaft 3 for connecting an external transmission structure. A mounting rod 4 is horizontally fixed below the two unwinding rollers 2. Two stabilizing rollers 5 are rotatably connected to the mounting rod 4. The two stabilizing rollers 5 are located on the left and right sides of the film roll to be unwound, respectively, and their roller surfaces are in contact with the side surfaces of the film roll. Along the unwinding direction of the film roll, a set of leveling rollers 6 is arranged downstream of the stabilizing rollers 5. The two ends of the leveling rollers 6 are rotatably connected to the side plates 1. The film material passes through the leveling rollers 6 after being crisscrossed between the two stabilizing rollers 5. A leveler is arranged in front of the leveling rollers 6. The leveler includes a mounting frame 7. A first roller 8 is rotatably connected to the mounting frame 7. An eliminator is installed above the first roller 8.

[0028] Eliminator Structure and Working Principle

[0029] The eliminator includes a prestressed telescopic rod 10. The fixed end of the telescopic rod 10 is connected to the mounting frame 7, and the movable end is equipped with a mounting seat 11. A second roller 9 is connected to the mounting seat 11 via two parallel connecting rods 12. The middle part of the connecting rods 12 is hinged to the connecting seat 13, and the two ends of the connecting seat 13 form a movable hinge structure with the connecting rods 12 and the mounting seat 11, respectively. Two limiting blocks 14 are slidably connected to the top of the mounting frame 7. The bottom surface of the limiting blocks 14 is connected to the mounting frame 7 via an elastic element. The elastic element is prestressed to maintain the limiting blocks 14 in a tight-fitting state against the connecting rods 12.

[0030] Work process and positive results

[0031] During the unwinding operation, the film roll is unwound by the rotation of the unwinding roller 2, while the stabilizing rollers 5 on both sides limit the axial displacement tendency of the film roll through their abutting action. After the film material is crossed and wound by the stabilizing rollers 5, its travel path is constrained into an "S" shape. This path can balance the centrifugal force during high-speed operation and reduce the tendency of swaying caused by uneven force on one side. When the film material shifts slightly due to inertia, the frictional resistance of the stabilizing rollers 5 and the geometric constraint of the cross path form a double limit, effectively suppressing axial sway.

[0032] After the membrane material enters the leveler, it first contacts the first roller 8 for initial flattening. If wrinkles occur during unwinding due to tension fluctuations, the telescopic rod 10 of the eliminator drives the mounting base 11 to shift via prestress, causing the second roller 9 to apply localized reverse tension to the wrinkled area. Simultaneously, the limiting block 14, under the action of the elastic element, provides dynamic support to the connecting rod 12, allowing the displacement of the second roller 9 to adaptively match the degree of wrinkling, thereby eliminating surface defects of the membrane material online. This process requires no manual intervention, significantly improving the flatness of the membrane material during unwinding and the processing quality of downstream processes.

[0033] Example 2

[0034] This embodiment optimizes the connection relationships and positional layout of key components based on Embodiment 1. Two stabilizing rollers 5 are rotatably connected to the mounting rod 4 via bearings, their axes parallel to the axis of the unwinding roller 2 and in the same vertical plane, ensuring symmetrical positioning of the film roll. Two sets of leveling rollers 6 are configured, located on the upper and lower sides downstream of the stabilizing rollers 5 respectively. The film material is sequentially and crosswise wound around the top of the upper leveling roller 6 and the bottom of the lower leveling roller 6, forming a multi-stage tension adjustment path. The mounting bracket 7 of the leveler is fixed to the front end of the side plate 1. The axes of the first roller 8 and the second roller 9 are both perpendicular to the axis of the unwinding roller 2, forming a flattening surface perpendicular to the film material's travel direction.

[0035] The mounting base 11 and the connecting rod 12 are connected by a ball joint, enabling the second roller 9 to have multi-degree-of-freedom adjustment capabilities. The limiting block 14 and the mounting frame 7 are connected by a helical spring, the prestress of which is preset according to the membrane thickness and tension requirements. When the membrane tension changes abruptly, the telescopic rod 10 quickly responds and drives the second roller 9 to move axially, changing the wrap angle between the membrane and the first roller 8, thereby adjusting the frictional resistance to achieve closed-loop tension control.

[0036] Work process and positive results

[0037] In high-speed unwinding scenarios, the inertial force of the film roll is decomposed into radial and axial components by the symmetrical limiting of the stabilizing roller 5. The axial component is offset by the friction between the stabilizing roller 5 and the side of the film roll, while the radial component is converted into the internal stress of the film material through the cross-winding path. The design of the multi-stage leveling roller 6 enables segmented tension adjustment: the front leveling roller 6 performs coarse adjustment, while the rear leveling roller 6, in conjunction with the eliminator, achieves fine adjustment.

[0038] When the system detects tension fluctuations, the telescopic rod 10 of the eliminator drives the second roller 9 to shift, synchronously changing the contact arc length between the first roller 8 and the second roller 9. If the tension is too high, the second roller 9 shifts in the opposite direction of the film's travel, reducing the contact arc length to lower frictional resistance; if the tension is insufficient, the second roller 9 shifts in the same direction as the film's travel, increasing the contact arc length to improve frictional resistance. This dynamic adjustment mechanism reduces the range of tension fluctuations, ensuring the film remains in a stable unwinding state. Simultaneously, the multi-degree-of-freedom adjustment capability of the second roller 9 can adapt to wrinkles with different radii of curvature, ensuring the universality of the flattening effect.

[0039] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A film roll unwinding device, characterized in that, Includes side plates (1), two side plates (1) are provided, an unwinding roller (2) is provided between the two side plates (1), the two unwinding rollers (2) are rotatably connected to the side plates (1), one end of one of the unwinding rollers (2) is provided with an installation shaft (3) of an external transmission structure, an installation rod (4) is provided below the unwinding roller (2), a stabilizing roller (5) for stabilizing the film roll is provided on the installation rod (4), at least one set of leveling rollers (6) is provided along the unwinding direction of the film roll, and a leveler is provided below the leveling rollers (6).

2. The film roll unwinding device according to claim 1, characterized in that, The two side plates (1) are arranged symmetrically.

3. The film roll unwinding device according to claim 1, characterized in that, There are two stabilizing rollers (5), which are respectively arranged on both sides of the roll film and abut against each other between the roll film. The stabilizing rollers (5) are rotatably connected to the mounting rod (4).

4. The film roll unwinding device according to claim 1, characterized in that, The two ends of each of the leveling rollers (6) are rotatably connected to the side plate (1), and the open film roll is crisscrossed and passed between each of the stabilizing rollers (5).

5. The film roll unwinding device according to claim 1, characterized in that, The smoother includes a mounting frame (7), a first roller (8) mounted on the mounting frame (7), the first roller (8) being rotatably connected to the mounting frame (7), and an eliminater for eliminating wrinkles mounted on the mounting frame (7).

6. The film roll unwinding device according to claim 5, characterized in that, The eliminator includes a telescopic rod (10) mounted on a mounting frame (7), a mounting seat (11) is mounted on the telescopic rod (10), a second roller (9) is provided on the mounting seat (11) via a connecting rod (12), the mounting seat (11) and the connecting rod (12) are connected by a connecting seat (13), and the two ends of the connecting seat (13) are hinged to the connecting rod (12) and the mounting seat (11).

7. A film roll unwinding device according to claim 6, characterized in that, The mounting bracket (7) is provided with a limiting block (14). The bottom surface of the limiting block (14) is connected to the mounting bracket (7) by an elastic element with appropriate prestress. The limiting block (14) is movably connected to the connecting rod (12).

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