Plastic bottle film sealing mechanism

Abstract

The utility model relates to the technical field of plastic bottle packaging, in particular to a plastic bottle film sealing mechanism. Comprising a rack; the first film roll and the second film roll are rotatably arranged on the rack; the guide roller is rotatably arranged on the rack; the heat sealing assembly is arranged on the rack; the plastic bottle clamping seat is arranged on the rack; a thin film on the first film roll is guided by the guide roller and passes through the heat sealing assembly, and therefore the thin film is attached to a bottle opening of a plastic bottle in the plastic bottle clamping base in a heat sealing mode. The heat sealing assembly comprises a fixing base fixedly connected with the rack; the fixed shaft is fixedly arranged at the lower end of the fixed seat; the first lifting plate is arranged on the fixed shaft in a sliding manner and is provided with a heat sealing column; and the bottom plate is fixedly arranged at the lower end of the fixed shaft and is provided with a hole cavity for the heat sealing column to penetrate through. The plastic bottle sealing device can achieve automatic sealing operation of plastic bottles and is reliable and efficient.

Description

Technical Field

[0001] This utility model relates to the field of plastic bottle packaging technology, specifically to a plastic bottle film sealing mechanism. Background Technology

[0002] Plastic bottles, as widely used medical packaging containers, typically require sealing at the bottle neck after filling to prevent leakage, contamination, or oxidation, and to ensure the product's shelf life and safety. Among various sealing technologies, film sealing is a common and efficient method, which achieves a seal by heat-pressing a thin film material onto the bottle neck. This method offers advantages such as low cost, fast sealing speed, and good adaptability, and is widely used in the food, beverage, pharmaceutical, and chemical industries.

[0003] Currently, there are various plastic bottle film sealing mechanisms on the market. A typical sealing mechanism usually includes a station for placing the plastic bottle, an unwinding device for providing the film, a guide component for guiding the film path, and a heat-sealing assembly for heating and pressing the film and bottle neck together. During operation, the film is pulled above the bottle neck, and the heat-sealing assembly presses down, heating and pressing the film against the periphery of the bottle neck to form a seal.

[0004] However, existing sealing mechanisms still face some technical challenges in practical applications. First, the stability and consistency of the heat-sealing process are crucial. If the downward pressure of the heat-sealing component is unstable or the contact with the bottle neck is insufficient, it can easily lead to weak seals, partial incomplete seals, or film tearing, affecting the reliability of the seal. Second, manufacturing tolerances of plastic bottles, and slight deviations in the height or position of the bottle neck during transport, can cause the heat-sealing component to collide hard with the bottle neck. This can damage not only the bottle neck or film but also impact the heat-sealing component itself, affecting its service life and sealing quality. Furthermore, for production lines requiring high efficiency and continuous production, simplifying the mechanism, improving the response speed and reset accuracy of the heat-sealing action, while ensuring uniform heating of the film and precise temperature control are also issues that need optimization. Utility Model Content

[0005] In order to solve the technical problems existing in the background art, the present invention provides a plastic bottle film sealing mechanism, which can realize the automatic sealing operation of plastic bottles, and is reliable and efficient.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A plastic bottle film sealing mechanism, including:

[0008] frame;

[0009] The first and second film rolls are rotatably mounted on the frame;

[0010] Guide rollers are rotatably mounted on the frame;

[0011] The heat-sealing assembly is mounted on the rack.

[0012] Plastic bottle holder, mounted on the machine frame;

[0013] In this process, the film on the first film roll is guided by a guide roller and then heat-sealed by a heat-sealing assembly to adhere to the mouth of a plastic bottle placed in a plastic bottle holder.

[0014] Furthermore, the heat-sealing component includes:

[0015] The mounting base is fixedly connected to the frame.

[0016] A fixed shaft is fixedly mounted at the lower end of a fixed base;

[0017] The first lifting plate is slidably mounted on a fixed shaft and is equipped with a heat sealing column;

[0018] The base plate is fixedly installed at the lower end of the fixed shaft and has a cavity through which the heating sealing column passes.

[0019] Furthermore, the upper end of the heat-sealing column is provided with a central guide shaft that is slidably connected to the first lifting plate. A central spring is sleeved on the outer periphery of the central guide shaft, and the two ends of the central spring abut against the heat-sealing column and the first lifting plate, respectively.

[0020] Furthermore, the heat-sealing assembly also includes:

[0021] The second lifting plate has two heat-sealing columns installed together.

[0022] Furthermore, the heat-sealing assembly also includes:

[0023] third lifting plate;

[0024] The bottom guide shaft is fixedly mounted on the third lifting plate and slidably connected to the second lifting plate;

[0025] The bottom spring is sleeved on the outer periphery of the bottom guide shaft and located between the third lifting plate and the second lifting plate.

[0026] Furthermore, a top guide shaft is provided on the first lifting plate, and the top guide shaft is slidably connected to the fixed base.

[0027] Furthermore, the fixed base is equipped with a cylinder, which drives the first lifting plate to move.

[0028] Furthermore, the heat-sealing column includes:

[0029] Column;

[0030] A connecting hole is provided at the upper end of the column and is fixedly connected to the central guide shaft.

[0031] The first cavity is located within the column and is equipped with a heating element;

[0032] The second chamber is located inside the column and is equipped with temperature monitoring elements.

[0033] The beneficial effects of this utility model are:

[0034] (1) The heat sealing assembly adopts a spring buffer design, which enables the heat sealing column to effectively absorb displacement errors and impacts during the pressing process, ensuring that the pressure applied to the bottle mouth is uniform and gentle. It can also automatically adapt to the bottle mouth of plastic bottles with slight deformation, significantly reducing the risk of film breakage, incomplete sealing or bottle mouth damage caused by uneven pressure, thereby ensuring the sealing performance and appearance consistency of the seal.

[0035] (2) Before the heat sealing operation, the third lifting plate will move downwards and work with the base plate to press and straighten the film. This effectively eliminates the looseness or wrinkles of the film, thereby ensuring the flatness of the subsequent heat sealing area and guaranteeing the sealing quality.

[0036] (3) Heating elements and temperature monitoring elements are installed inside the heat sealing column, which realizes real-time monitoring and closed-loop control of the heat sealing temperature. This ensures that the heat sealing temperature remains stable within the optimal range, guarantees consistent heat input for each heat sealing operation, and results in high sealing strength and reliable sealing performance.

[0037] (4) It integrates multiple functional modules such as film placement, guiding, and heat sealing into one unit. With the plastic bottle holder, it can be easily connected to upstream and downstream equipment such as conveyor lines to realize automatic positioning and continuous sealing of plastic bottles, which significantly improves the automation level of the production line and the overall sealing efficiency. Attached Figure Description

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0039] Figure 1 This is a schematic diagram of the structure of this utility model;

[0040] Figure 2 This is a structural diagram of a heat-sealing assembly. Figure 1 ;

[0041] Figure 3 This is a structural diagram of a heat-sealing assembly. Figure 2 ;

[0042] Figure 4 This is a schematic diagram of the heat-sealing column.

[0043] In the picture:

[0044] 1. Frame, 2. First film roll, 3. Guide roller, 4. Heat sealing assembly, 5. Second film roll, 6. Plastic bottle holder;

[0045] 401. Fixed seat, 402. Fixed shaft, 403. First lifting plate, 404. Heat sealing column, 405. Second lifting plate, 406. Third lifting plate, 407. Base plate, 408. Cavity, 409. Bottom guide shaft, 410. Bottom spring, 411. Middle guide shaft, 412. Middle spring, 413. Top guide shaft, 414. Cylinder;

[0046] 4041. Column, 4042. Connecting hole, 4043. First cavity, 4044. Second cavity. Detailed Implementation

[0047] The present invention will be further described in detail below with reference to the accompanying drawings.

[0048] like Figure 1 As shown, the plastic bottle film sealing mechanism includes a frame 1. A first film roll 2 and a second film roll 5 are rotatably mounted on the upper end of the frame 1. Several guide rollers 3 are rotatably mounted on the frame 1. A heat-sealing assembly 4 is mounted on the frame 1. A plastic bottle holder 6 is mounted on the frame 1 and is used to hold the plastic bottle to be sealed. The film on the first film roll 2 is guided by the guide rollers 3 and passes through the heat-sealing assembly 4, thereby heat-sealing it onto the bottle neck placed in the plastic bottle holder 6. The used film is guided by the guide rollers 3 and rewound onto the second film roll 5. This equipment integrates multiple functional modules such as film feeding, guiding, and heat sealing. Combined with the plastic bottle holder 6, it can be easily connected to upstream and downstream equipment such as conveyor lines to achieve automatic positioning and continuous sealing of plastic bottles, significantly improving the automation level and overall sealing efficiency of the production line.

[0049] like Figure 2 , 3 As shown, the specific structure of the heat sealing assembly 4 includes a fixed base 401. The fixed base 401 is fixedly connected to the frame 1. A fixed shaft 402 is fixedly disposed at the lower end of the fixed base 401. A first lifting plate 403 is slidably disposed on the fixed shaft 402, and the first lifting plate 403 is provided with a heat sealing column 404. A base plate 407 is fixedly disposed at the lower end of the fixed shaft 402 and has a cavity 408 through which the heat sealing column 404 passes. When the heat sealing column 404 passes downward through the cavity 408, it will cut off the film covering the cavity 408 and simultaneously heat-press it onto the mouth of the plastic bottle placed in the plastic bottle holder 6.

[0050] The upper end of the heat-sealing column 404 is provided with a central guide shaft 411 that is slidably connected to the first lifting plate 403. A central spring 412 is sleeved on the outer periphery of the central guide shaft 411, and the two ends of the central spring 412 abut against the heat-sealing column 404 and the first lifting plate 403, respectively. The heat-sealing column 404 adopts a spring buffer design, which enables the heat-sealing column 404 to effectively absorb displacement errors and impacts during the pressing process, ensuring that the pressure applied to the bottle mouth is uniform and gentle. It can also automatically adapt to the bottle mouth of plastic bottles with slight deformation, significantly reducing the risk of film breakage, incomplete sealing, or bottle mouth damage caused by uneven pressure, thereby ensuring the sealing performance and appearance consistency of the seal.

[0051] The two heat-sealing columns 404 are also connected to a second lifting plate 405. A bottom guide shaft 409 is fixedly mounted on a third lifting plate 406 and slidably connected to the second lifting plate 405. A bottom spring 410 is sleeved on the outer periphery of the bottom guide shaft 409 and located between the third lifting plate 406 and the second lifting plate 405. Before the heat-sealing operation of the heat-sealing columns 404, the third lifting plate 406 moves downwards, working in conjunction with the base plate 407 to press and straighten the film. This effectively eliminates any looseness or wrinkles in the film, thereby ensuring the flatness of the heat-sealing area at the subsequent cavity 408 position and guaranteeing the sealing quality.

[0052] The fixed base 401 is equipped with a cylinder 414, which drives the first lifting plate 403 to move. The first lifting plate 403 is equipped with a top guide shaft 413, which is slidably connected to the fixed base 401.

[0053] like Figure 4 As shown, the heat-sealing column 404 includes a column body 4041. A connecting hole 4042 is formed at the upper end of the column body 4041 and is fixedly connected to the central guide shaft 411. A first cavity 4043 is formed in the column body 4041 and a heating element is installed therein. A second cavity 4044 is formed in the column body 4041 and a temperature monitoring element is installed therein. In a specific embodiment, the heating element is a heating rod. The temperature monitoring element is a thermocouple.

[0054] The heat-sealing column 404 is equipped with heating and temperature monitoring elements, enabling real-time monitoring and closed-loop control of the heat-sealing temperature. This ensures that the heat-sealing temperature remains stable within the optimal range, guaranteeing consistent heat input for each heat-sealing operation, resulting in high sealing strength and reliable sealing performance.

[0055] Specific work steps:

[0056] Cylinder 414 drives the first lifting plate 403 to descend, and the first lifting plate 403 drives the second lifting plate 405 and the third lifting plate 406 to descend synchronously.

[0057] The bottom spring 410 is compressed, and the third lifting plate 406 first presses against the bottom plate 407. Together with the bottom plate 407, it presses and straightens the film located between the third lifting plate 406 and the bottom plate 407 to ensure the flatness of the heat-sealing area at the cavity 408.

[0058] The bottom spring 410 is further compressed, and the heat-sealing column 404 passes downward through the cavity 408. The heat-sealing column 404 will cut off the film covering the cavity 408 and simultaneously heat-seal it to the mouth of the plastic bottle placed in the plastic bottle holder 6.

[0059] The heat-sealing column 404 employs a spring buffer design consisting of a central spring 412, which effectively absorbs displacement errors and impacts during the pressing process, ensuring uniform and gentle pressure applied to the bottle mouth. It can also automatically adapt to the slight deformation of the plastic bottle mouth, significantly reducing the risk of film breakage, incomplete sealing, or bottle mouth damage caused by uneven pressure, thereby ensuring the sealing performance and consistent appearance of the seal.

[0060] To ensure that the above steps can be carried out in an orderly manner, the stiffness of the middle spring 412 must be greater than that of the bottom spring 410.

[0061] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A plastic bottle film sealing mechanism, characterized in that, include: Rack (1); The first film roll (2) and the second film roll (5) are rotatably mounted on the frame (1); Guide roller (3) is rotatably mounted on the frame (1); A heat-sealing assembly (4) is disposed on the frame (1); A plastic bottle holder (6) is mounted on the frame (1); The film on the first film roll (2) is guided by the guide roller (3) and passed through the heat sealing assembly (4) to be heat-sealed onto the mouth of the plastic bottle placed in the plastic bottle holder (6).

2. The plastic bottle film sealing mechanism according to claim 1, characterized in that, The heat-sealing assembly (4) includes: A fixed base (401) is fixedly connected to the frame (1); A fixed shaft (402) is fixedly disposed at the lower end of the fixed base (401); The first lifting plate (403) is slidably mounted on the fixed shaft (402) and is provided with a heat sealing column (404). The base plate (407) is fixedly disposed at the lower end of the fixed shaft (402) and has a cavity (408) through which the heat sealing column (404) passes.

3. The plastic bottle film sealing mechanism according to claim 2, characterized in that, The upper end of the heat-sealing column (404) is provided with a central guide shaft (411) that is slidably connected to the first lifting plate (403). A central spring (412) is sleeved on the outer periphery of the central guide shaft (411). The two ends of the central spring (412) abut against the heat-sealing column (404) and the first lifting plate (403) respectively.

4. The plastic bottle film sealing mechanism according to claim 3, characterized in that, The heat-sealing assembly (4) further includes: The second lifting plate (405) and the two heat sealing columns (404) are jointly disposed on the second lifting plate (405).

5. The plastic bottle film sealing mechanism according to claim 4, characterized in that, The heat-sealing assembly (4) further includes: third lifting plate (406); The bottom guide shaft (409) is fixedly mounted on the third lifting plate (406) and slidably connected to the second lifting plate (405); The bottom spring (410) is sleeved on the outer periphery of the bottom guide shaft (409) and located between the third lifting plate (406) and the second lifting plate (405).

6. The plastic bottle film sealing mechanism according to claim 2, characterized in that, The first lifting plate (403) is provided with a top guide shaft (413), which is slidably connected to the fixed seat (401).

7. The plastic bottle film sealing mechanism according to claim 2, characterized in that, The fixed base (401) is equipped with a cylinder (414), which drives the first lifting plate (403) to move.

8. The plastic bottle film sealing mechanism according to claim 3, characterized in that, The heat-sealing column (404) includes: Column (4041); A connecting hole (4042) is provided at the upper end of the column (4041) and is fixedly connected to the central guide shaft (411); The first cavity (4043) is opened in the column (4041) and is equipped with a heating element; The second cavity (4044) is located in the column (4041) and is equipped with a temperature monitoring element.

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