Automatic roll changing device for high-speed two-way stretch polyester film thick film

Abstract

The utility model relates to the technical field of automatic roll changing, in particular to an automatic roll changing device for a high-speed two-way stretch polyester thick film, which comprises a base, a rotating table which is arranged above the base and is driven by a motor to rotate, and a fixed seat which is fixed above the base. According to the automatic roll changing device for the high-speed two-way stretch polyester thick film, roll changing without shutdown is achieved through cooperative action of the rotating table double-station wind-up roll and the movable base, and the production efficiency is improved by 30% or above; through the meshing design of the driving gear and the arc-shaped guide rail, it is ensured that the arc-shaped motion trail of the ejector rod is synchronous with the winding roller, the reel changing time is shortened to be within 5 seconds, the left abutting roller, the lower abutting roller and the reset spring are combined to form a dynamic buffering guide system, and tension fluctuation during thick film reel changing is reduced (the peak tension is reduced by 25%).

Description

Technical Field

[0001] This utility model relates to the field of automatic roll changing technology, specifically an automatic roll changing device for high-speed biaxially oriented polyester film thick film. Background Technology

[0002] With the widespread application of biaxially oriented polyester film (BOPET) in packaging, electronics, and other fields, the demand for continuous winding of thick films (thickness ≥ 50 μm) in its production process is increasing. Traditional roll-changing devices mostly use single-station winding or manual intervention for roll changing, which has the following problems:

[0003] Low roll changing efficiency: It requires stopping the machine to switch the take-up roll, which leads to production line interruption and affects production capacity;

[0004] Thick films are prone to breakage: Thick films have high tension, and stress concentration during roll changes can easily lead to breakage or wrinkles.

[0005] Poor alignment accuracy: Existing guiding mechanisms cannot guarantee accurate bonding of new / old film rolls, and are prone to misalignment;

[0006] Insufficient buffering: The take-up roller and guide roller are in rigid contact, which can easily damage the film surface. Utility Model Content

[0007] To address the shortcomings of existing technologies, this invention provides an automatic roll-changing device for high-speed biaxially oriented polyester film of thick film, which solves the aforementioned problems.

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution: an automatic roll changing device for high-speed biaxially oriented polyester film thick film, comprising a base, a rotating table driven to rotate above the base by a motor, and a fixed seat fixed above the base. Two take-up rollers and two guide rollers are rotatably connected to the surface of the rotating table, and the two take-up rollers and the two guide rollers are distributed in a ring array on the surface of the rotating table.

[0009] A guide rail is fixedly connected to the surface of the fixed base, and a movable base driven by a power source is slidably connected to one side of the guide rail;

[0010] The surface of the movable base is rotatably connected to a left abutment roller, a lower abutment roller, and a drive gear via bearing seats. A fixing block is fixedly connected to the surface of the movable base, and an arc-shaped guide rail is slidably connected to the inner cavity of the fixing block. A top rod is fixedly connected to one side of the arc-shaped guide rail, and a cutter driven by a cylinder is slidably connected to the surface of the top rod. The top of the arc-shaped guide rail has teeth that mesh with the drive gear. When changing rollers during use, the left take-up roller with the film wound on it is rotated to the right, and the unwound take-up roller is rotated to the left. At this time, the film abuts against the left take-up roller and the lower guide roller respectively. Then, the movable base is driven to move to the right on the guide rail, causing the left abutment roller to abut against the left side of the left take-up roller, and the lower abutment roller to abut against the left side of the left take-up roller. The film passes between the left abutment roller and the left take-up roller, then through the lower take-up roller and contacts the top rod. It is then wound up by the right take-up roller. The cutter on the top rod cuts the film. At this time, the left take-up roller rotates and winds the film around it under electrostatic adsorption. During the cutting, the drive gear drives the arc-shaped guide rail to rotate counterclockwise around the left take-up roller, which in turn drives the top rod to push the film in an arc shape, moving it towards the left take-up roller so that it can be effectively wound around the left take-up roller. Even if the film is relatively thick, it can maintain a good winding effect. The lower abutment roller of the left abutment roller applies an external guiding force to guide the film and make it fit the surface of the left take-up roller, which facilitates roll changing.

[0011] As a further embodiment of this utility model: the arc-shaped guide rail moves with the left take-up roller as the center.

[0012] As a further embodiment of this utility model: the bearing seats at the connection points between the left abutting roller and the lower abutting roller and the moving seat are both fixedly connected with a return spring that is fixedly connected to the inner cavity of the moving seat. By setting the return spring, when the left abutting roller and the lower abutting roller come into contact with the take-up roller, a buffer space is reserved to prevent excessive squeezing force from affecting the normal rotation of the take-up roller and causing damage to the polyester film.

[0013] As a further embodiment of this utility model: when the arc-shaped guide rail is in its initial position, the top rod is located to the lower right of the lower abutment roller.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] High-efficiency continuous production:

[0016] By coordinating the operation of the rotary table's dual-station take-up rollers and the moving seat, roll changing can be achieved without stopping the machine, increasing production efficiency by more than 30%.

[0017] The meshing design of the drive gear and the arc-shaped guide rail ensures that the arc-shaped movement trajectory of the top rod is synchronized with the take-up roller, reducing the roll change time to within 5 seconds.

[0018] Thick film stable winding:

[0019] The left abutment roller, the lower abutment roller, and the reset spring combine to form a dynamic buffer guide system, which reduces tension fluctuations during thick film roll changes (peak tension decreases by 25%).

[0020] The cutter and top rod work together to cut the film, and combined with electrostatic adsorption technology, ensure that the cut end of the film is quickly attached to the new roll, avoiding film breakage or loosening.

[0021] High-precision alignment:

[0022] The arc-shaped guide rail moves along the trajectory of the center of the take-up roller, and in conjunction with the linear movement of the guide rail, it achieves precise bonding between the film end and the surface of the take-up roller (offset ≤ 0.5mm).

[0023] Modular scalability:

[0024] The separate design of the fixed base and the movable base can be adapted to polyester film production lines with different widths (500-2000mm), reducing equipment modification costs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention in the roll-changing state;

[0026] Figure 2 This is a cross-sectional view of the structure of this utility model in the roll-changing state;

[0027] Figure 3 This is a schematic diagram of the structural connection of this utility model in the unrolled state;

[0028] Figure 4 This utility model Figure 2 A magnified view of a portion of point A in the middle.

[0029] In the diagram: 1. Base; 2. Fixed seat; 3. Rotary table; 4. Guide roller; 5. Take-up roller; 6. Guide rail; 7. Moving seat; 8. Left abutment roller; 9. Lower abutment roller; 10. Return spring; 12. Drive gear; 13. Fixed block; 14. Arc-shaped guide rail; 15. Top rod; 16. Cutting knife. Detailed Implementation

[0030] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0031] Please see Figure 1-4 This utility model provides the following three technical solutions:

[0032] Example 1

[0033] An automatic roll-changing device for high-speed biaxially oriented polyester film thick film includes a base 1, a rotating table 3 driven to rotate above the base 1 by a motor, and a fixed seat 2 fixed above the base 1. Two take-up rollers 5 and two guide rollers 4 are rotatably connected to the surface of the rotating table 3, and the two take-up rollers 5 and the two guide rollers 4 are distributed in a ring array on the surface of the rotating table 3.

[0034] A guide rail 6 is fixedly connected to the surface of the fixed base 2, and a movable base 7 driven by a power source is slidably connected to one side of the guide rail 6.

[0035] The surface of the movable seat 7 is rotatably connected to the left abutment roller 8, the lower abutment roller 9, and the drive gear 12 via bearing seats. A fixing block 13 is fixedly connected to the surface of the movable seat 7. An arc-shaped guide rail 14 is slidably connected to the inner cavity of the fixing block 13. A top rod 15 is fixedly connected to one side of the arc-shaped guide rail 14. A cutter 16 driven by a cylinder is slidably connected to the surface of the top rod 15. The top of the arc-shaped guide rail 14 has teeth that mesh with the drive gear 12. When changing rollers, the left take-up roller 5 with the film wound around it is rotated to the right, and the unwound take-up roller 5 is rotated to the left. At this time, the film abuts against the left take-up roller 5 and the lower guide roller 4 respectively. Then, the movable seat 7 is driven to move to the right on the guide rail 6, causing the left abutment roller 8 to abut against the left side of the left take-up roller 5, and the lower abutment roller 9 to abut against the left side of the left take-up roller 5. The receiving roller 9 abuts against the lower part of the left take-up roller 5. At this time, the film passes between the left receiving roller 8 and the left take-up roller, then passes through the lower take-up roller 5 and contacts the top rod 15. Then it is wound up by the right take-up roller 5. Then the cutter 16 on the surface of the top rod 15 is activated to cut the film. At this time, the left take-up roller 5 rotates and winds the film under electrostatic adsorption. When cutting, the drive gear 12 drives the arc guide rail 14 to rotate counterclockwise around the left take-up roller 5, which drives the top rod 15 to make an arc-shaped push, pushing the film towards the left take-up roller 5, so that it is effectively wound by the left take-up roller 5. Even if the film is relatively thick, it can maintain a good winding effect. The setting of the lower receiving roller 9 of the left receiving roller 8 applies an external guiding force to guide the film and make it fit the surface of the left take-up roller 5, which facilitates the change of roll.

[0036] The arc-shaped guide rail 14 moves with the left take-up roller 5 as the center.

[0037] The bearing seats at the connection points between the left abutment roller 8 and the lower abutment roller 9 and the movable seat are all fixedly connected with a return spring 10 that is fixedly connected to the inner cavity of the movable seat 7. By setting the return spring 10, when the left abutment roller 8 and the lower abutment roller 9 come into contact with the take-up roller 5, a buffer space is reserved to prevent excessive squeezing force from affecting the normal rotation of the take-up roller 5 and causing damage to the polyester film.

[0038] When the arc-shaped guide rail 14 is in its initial position, the top rod 15 is located to the lower right of the lower abutment roller 9.

[0039] Example 2

[0040] Fully automated roll changing process for thick film

[0041] Initial state: The left take-up roller 5 of the rotary table 3 has completed the winding of the thick film (thickness 80μm), and the right take-up roller 5 is in standby state;

[0042] Roll change trigger: When the left take-up roller 5 reaches the set length, the motor drives the rotary table 3 to rotate 180° counterclockwise, so that the right empty roller is switched to the left station.

[0043] Positioning of the moving seat: The moving seat 7 moves to the right along the guide rail 6, the left abutting roller 8 presses against the left side of the new winding roller, the lower abutting roller 9 abuts against the bottom of the new winding roller, and the return spring 10 provides a buffer force of 10-15N;

[0044] Thin film severing and adsorption:

[0045] The cylinder drives the cutter 16 to cut the film, while the drive gear 12 drives the arc guide rail 14 to rotate counterclockwise, and the push rod 15 pushes the end of the film to the surface of the new roll along the arc trajectory.

[0046] The new roll is activated by electrostatic adsorption (voltage 1.5kV) to firmly adhere the film ends;

[0047] Continuous winding: The new roll is wound at a speed of 20m / min, and the old roll is automatically unloaded, requiring no manual intervention throughout the process.

[0048] Example 3

[0049] Return spring optimization and impact resistance testing

[0050] Structural improvement: A double return spring 10 is added inside the bearing seat of the left abutment roller 8, with a stiffness coefficient of 50N / mm and a pre-compression amount of 5mm;

[0051] Test conditions: Simulated instantaneous impact force (peak value 200N) during roll changing of a thick film (100μm thickness);

[0052] Results analysis:

[0053] The return spring 10 has a compression of 8mm and absorbs approximately 80J of impact energy. The rotational speed fluctuation range of the take-up roller 5 is reduced from ±5% to ±1.5%.

[0054] The film surface is free of indentations or scratches, and the film breakage rate is reduced from 3.2% in conventional devices to below 0.5%.

[0055] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A high-speed automatic roll changing device for biaxially oriented polyester film thick film, comprising a base (1), a rotating table (3) rotating above the base (1) by motor drive, and a fixed base (2) fixed above the base (1), characterized in that: The surface of the rotating table (3) is rotationally connected with two winding rollers (5) and two guide rollers (4), and the two winding rollers (5) and the two guide rollers (4) are distributed in an annular array on the surface of the rotating table (3); The surface of the fixed seat (2) is fixedly connected with a guide rail (6), one side of the guide rail (6) is slidingly connected with a moving seat (7) driven by a power source; The surface of the moving seat (7) is rotationally connected with a left abutting roller (8), a lower abutting roller (9) and a drive gear (12) through a bearing seat, the surface of the moving seat (7) is fixedly connected with a fixed block (13), the inner cavity of the fixed block (13) is slidingly connected with an arc-shaped guide rail (14), one side of the arc-shaped guide rail (14) is fixedly connected with a top rod (15), the surface of the top rod (15) is slidingly connected with a cutter (16) driven by an air cylinder, and the top of the arc-shaped guide rail (14) is provided with a tooth pattern engaged with the drive gear (12).

2. The automatic roll changing device for thick film of high speed biaxially oriented polyester film according to claim 1, characterized in that: The arc-shaped guide rail (14) moves with the left winding roller (5) as the center.

3. The automatic roll changing device for thick film of high speed biaxially oriented polyester film according to claim 1, characterized in that: The bearing seat at the connection between the left abutting roller (8) and the lower abutting roller (9) and the moving seat is fixedly connected with a reset spring (10) fixedly connected with the inner cavity of the moving seat (7).

4. The automatic roll changing device for thick film of high speed biaxially oriented polyester film according to claim 1, characterized in that: When the arc-shaped guide rail (14) is in the initial position, the top rod (15) is located below and to the right of the lower abutting roller (9).

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