Bidirectional film stretching device

Abstract

The utility model discloses a film two-way stretching device which comprises a circular workbench used for containing a film, a driving motor arranged on a bottom plate of the workbench, sliding grooves formed along the radius of the workbench, a plurality of fan-shaped sliding grooves distributed on the single side, and two sets of sliding grooves symmetrically arranged about the center line of the workbench. The bidirectional stretching assembly is installed in the sliding groove in a sliding mode, and a clamp for clamping the thin film is hinged to the upper half portion of the stretching assembly; and the pushing assembly is arranged on the lower end face of the circular workbench in a sliding mode and arranged relative to the lower half of the stretching assembly, and the pushing assembly is connected with the output end of the driving motor. According to the two-way film stretching device, the problem that horizontal plane stretching in the transverse direction or the longitudinal direction cannot be carried out at the same time in the prior art is solved.

Description

A device for biaxial stretching of thin films Technical Field

[0001] This utility model relates to the field of thin film processing technology, specifically to a device for biaxial stretching of thin films. Background Technology

[0002] Film stretching is a crucial step in film production, aimed at improving film performance. Current film stretching methods are mainly categorized into uniaxial and biaxial stretching. Uniaxially stretched films, such as polypropylene (OPP) film, are commonly used in packaging due to their high tensile strength and good transparency, making them suitable for food packaging and adhesive tapes. Biaxially stretched films, such as polyester (BOPET) film, are used in electronics, packaging, and optics.

[0003] In the prior art, most film stretching can only achieve stretching in one horizontal direction. For example, application number 202321089730.4 describes a film biaxial stretching machine. The moving plate moves on the outside of the positive and negative threaded rods by a drive motor, and then the support plate drives the fixed shaft to move, so that the film can be stretched in a parallel plane. However, the device has the following drawback: the structure of the positive and negative threaded rods can only achieve stretching of both sides of a single horizontal plane of the film at a time, and cannot simultaneously perform horizontal stretching in two directions, either transverse or longitudinal. Summary of the Invention

[0004] One object of this invention is to solve at least the aforementioned problems and / or defects, and to provide at least the advantages described below.

[0005] To achieve these objectives and other advantages according to the present invention, an apparatus for biaxial stretching of a thin film is provided, comprising: a circular worktable for placing the thin film, wherein a drive motor is placed on the base plate of the worktable; and further comprising:

[0006] The slide is opened along the radius of the worktable, and multiple slides are distributed in a fan shape on one side. Two sets of slides are symmetrically arranged about the center line of the worktable.

[0007] A bidirectional stretching assembly is slidably installed in a groove, and the upper half of the stretching assembly is hinged with a clamp to hold the film.

[0008] A pushing component is slidably disposed on the lower end face of a circular worktable and disposed relative to the lower half of a stretching component. The pushing component is connected to the output end of a drive motor.

[0009] Preferably, the structure of the tensioning component further includes:

[0010] A roller is located at the bottom of the moving rod and is tactilely connected to the pushing assembly.

[0011] The structure of the propulsion component includes:

[0012] Gear I, which is fixedly mounted on the output shaft of the drive motor;

[0013] A rotating shaft is provided with a forward-rotating threaded section, a threadless section and a reverse-rotating threaded section in sequence, and a gear II is fixedly installed on the threadless section, with gear II meshing with gear I;

[0014] The movable plate with grooves has two sets of grooves arranged symmetrically about gear II, and is located on the forward thread section and the reverse thread section respectively. The grooves are arranged opposite to the rollers to achieve rolling connection.

[0015] Preferably, the movable plate with grooves has through holes on both sides;

[0016] Guide posts are installed on both sides of the worktable, and the guide posts are sleeved in the through holes to realize the horizontal sliding of the pushing component.

[0017] This utility model has at least the following beneficial effects:

[0018] This device uses a series of sliding grooves arranged in a fan shape along the radius to push the component in conjunction with multiple stretching components, thereby stretching the film in both the transverse and longitudinal directions and ensuring the consistency of the quality and performance of the film after stretching.

[0019] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0020] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 is a top view of this utility model;

[0022] Figure 3 is an enlarged cross-sectional view of point A in Figure 2 of this utility model;

[0023] Figure 4 is a side view of this utility model;

[0024] Figure 5 is a schematic diagram of the separately disassembled tensioning component and pushing component of this utility model;

[0025] The markings in the diagram are: 1. Worktable, 11. Film, 2. Drive motor, 3. Slide, 4. Stretching assembly, 41. Moving rod, 42. Ball bearing assembly, 43. Roller, 5. Fixture, 6. Pushing assembly, 61. Gear I, 62. Rotating shaft, 63. Gear II, 64. Moving plate, 65. Groove, 7. Through hole, 8. Guide post, A. Forward threaded section, B. Unthreaded section, C. Reverse threaded section. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0027] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0028] It should be noted that in the description of this utility model, the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0030] Furthermore, in this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] The following is a detailed description of this novel experimental device with reference to the accompanying drawings:

[0032] Figures 1-5 show a device for biaxial stretching of a thin film according to the present invention, including: a circular worktable 1 for placing the thin film 11, a drive motor 2 placed on its base plate, and further including:

[0033] The slide 3 is opened along the radius of the worktable 1, and multiple slides are distributed in a fan shape on one side. Two sets of slides 3 are symmetrically arranged about the center line of the worktable 1.

[0034] The bidirectional stretching assembly 4 is slidably installed in the slide groove 3, and the upper half of the stretching assembly 4 is hinged with a clamp 5 for clamping the film 11.

[0035] The pushing component 6 is slidably disposed on the lower end face of the circular worktable 1 and is disposed relative to the lower half of the stretching component 4. The pushing component 6 is connected to the output end of the drive motor 2.

[0036] Working principle:

[0037] The operator first lays the film 11 flat on the circular worktable 1, uses the clamp 5 to fix the two sides of the film 11, and starts the drive motor 2 through the external power supply. The drive motor 2 transmits power to the push component 6 on the lower end of the circular worktable 1, so that the push component 6 moves horizontally to both sides. During the sliding process, it will generate a thrust on the stretching component 4, so that the stretching component 4 slides along the slide groove 3.

[0038] At this time, multiple stretching components 4 arranged symmetrically on both sides slide simultaneously along the radial direction, driving the clamp 5 to stretch the film 11 in both the transverse and longitudinal directions at the same time, achieving the effect of bidirectional stretching.

[0039] The fixture 5 can be selected from commercially available products according to the film 11 to be processed, or can be selected from applications such as CN201810004349.0, a film material tensile test fixture device, etc.

[0040] This device uses a series of sliding grooves 3 arranged in a fan shape along the radius to push the component 6 in conjunction with multiple stretching components 4, thereby stretching the film 11 in the transverse and longitudinal directions and ensuring the consistency of the quality and performance of the film 11 after stretching.

[0041] As described above, the structure of the stretching component 4 includes:

[0042] The upper half of the movable rod 41 is hinged to a clamp 5 for holding the film 11;

[0043] The ball bearing assembly 42 is symmetrically arranged in the middle section of the moving rod 41, and the ball bearing assembly 42 is tactilely connected to the slide groove 3.

[0044] Working principle:

[0045] After the equipment is started, the pushing component 6 begins to move under the drive of the drive motor 2. The pushing component 6 acts on the bottom of the moving rod 41, so that the moving rod 41 is subjected to force. As the moving rod 41 slides in the slide groove 3, the moving rod 41 will drive the clamp 5 to move along the radius of the worktable 1. The two sets of symmetrically distributed slide grooves 3 and the stretching component 4 work together to achieve bidirectional stretching of the film 11.

[0046] The ball bearing assembly 42 can roll within the slide groove 3, which greatly reduces the friction between the moving rod 41 and the slide groove 3, allowing the moving rod 41 to slide smoothly along the slide groove 3. Furthermore, the symmetrically distributed ball bearing assembly 42 can evenly support the moving rod 41, ensuring its stability when moving within the slide groove 3 and preventing the moving rod 41 from wobbling or deviating.

[0047] In actual use, select a suitable lubricant, such as lubricating oil or grease, and apply it evenly to the contact surface between the ball assembly 42 and the slide groove 3 to reduce the friction between the ball assembly 42 and the slide groove 3 and extend the service life of the components.

[0048] In summary, the tensioning assembly 4 has a relatively simple structure, mainly consisting of a moving rod 41, a ball bearing assembly 42, and a clamp 5. The number of parts is small, which reduces the complexity of the structure.

[0049] As described above, the structure of the stretching component 4 further includes:

[0050] A roller 43 is rotatably disposed at the bottom of the moving rod 41, and the roller 43 is in a rolling connection with the pushing assembly 6.

[0051] The structure of the driving component 6 includes:

[0052] Gear I61 is fixedly mounted on the output shaft of drive motor 2;

[0053] The rotating shaft 62 has a forward threaded section A, a threadless section B, and a reverse threaded section C arranged sequentially on it. Gear II 63 is fixedly installed on the threadless section B, and gear II 63 meshes with gear I 61.

[0054] The movable plate 64 with groove 65 has two sets of grooves symmetrically arranged about gear II 63, and is located on the forward thread section A and the reverse thread section C respectively. The groove 65 is arranged opposite to the roller 43 to achieve rolling connection.

[0055] Working principle:

[0056] After the drive motor 2 is started by the external power supply, its output shaft drives gear I 61 to rotate, and drives gear II 63 to rotate through the meshing relationship. Since gear II 63 is fixed on the unthreaded section B of the rotating shaft 62, the rotating shaft 62 starts to rotate synchronously.

[0057] As the rotating shaft 62 begins to rotate, both the forward-rotating thread segment A and the reverse-rotating thread segment C drive the corresponding moving plate 64 to move away from gear II 63, thus achieving opposite movements for the two sets of moving plates 64.

[0058] Due to the shape of the circular worktable 1, when the moving plate 64 moves outward, the radius of its movement trajectory gradually increases. In order for the stretching component 4 to move obliquely along the slide 3, the roller 43 can roll horizontally in the groove 65 during the forward pushing of the moving plate 64 (in order to meet the process of radius increase and avoid jamming). The two sets of symmetrical slides 3 and stretching components 4 work together to realize the transverse and longitudinal stretching of the film 11.

[0059] Among them, the forward-rotating thread section A and the reverse-rotating thread section C are combined with the gear II 63 to ensure that the two sets of moving plates 64 move at equal speeds and in opposite directions, thereby achieving bidirectional stretching of the film 11 and avoiding tearing or uneven performance of the film 11 due to uneven stretching.

[0060] In the above scheme, the movable plate 64 with groove 65 is provided with through holes 7 on both sides;

[0061] Guide posts 8 are installed on both sides of the worktable 1, and the guide posts 8 are sleeved in the through holes 7 to realize the horizontal sliding of the pushing component 6.

[0062] Working principle:

[0063] The through holes 7 on both sides of the movable plate 64 cooperate with the guide posts 8 installed on both sides of the workbench 1. During the movement of the movable plate 64, the guide posts 8 are always fitted into the through holes 7, providing horizontal guidance constraints for the movable plate 64.

[0064] This allows the movable plate 64 to slide smoothly along the axial direction of the guide post 8 under the drive of the threaded transmission, avoiding radial offset or shaking that may occur due to the threaded transmission.

[0065] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An apparatus for biaxial stretching of a thin film, comprising: A circular worktable for placing a film, with a drive motor placed on its base plate, is characterized by further comprising: a sliding groove, which is opened along the radius of the worktable and is distributed in a fan shape on one side, with two sets of sliding grooves symmetrically arranged about the center line of the worktable; a bidirectional stretching assembly, which is slidably installed in the sliding groove, and the upper half of the stretching assembly is hinged to a clamp for holding the film; and a pushing assembly, which is slidably arranged on the lower end face of the circular worktable and is arranged relative to the lower half of the stretching assembly, the pushing assembly being connected to the output end of the drive motor.

2. The apparatus for biaxial stretching of thin films according to claim 1, characterized in that, The structure of the stretching assembly includes: a movable rod, the upper half of which is hinged to a clamp for holding the film; and a ball bearing assembly, which is symmetrically arranged in the middle section of the movable rod and is tactilely connected to a sliding groove.

3. The apparatus for biaxial stretching of thin films according to claim 2, characterized in that, The structure of the stretching assembly further includes: a roller, which is rotatably disposed at the bottom of the moving rod, and the roller is in rolling connection with the pushing assembly; the structure of the pushing assembly includes: a gear I, which is fixedly mounted on the output shaft of the drive motor; a rotating shaft, on which a forward threaded section, a non-threaded section and a reverse threaded section are sequentially arranged, and a gear II is fixedly mounted on the non-threaded section, and the gear II meshes with the gear I; a moving plate with grooves, which is symmetrically arranged in two sets about the gear II, and is located on the forward threaded section and the reverse threaded section respectively, and the grooves are arranged opposite to the rollers to achieve rolling connection.

4. The apparatus for biaxial stretching of thin films according to claim 3, characterized in that, The grooved movable plate has through holes on both sides; guide posts are installed on both sides of the worktable, and the guide posts are sleeved in the through holes to realize the horizontal sliding of the pushing component.

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