Plastic film edge sealing device

Abstract

The utility model relates to the field of film edge sealing, and particularly discloses a plastic film edge sealing device which comprises a workbench and an edge sealing platform, two liftable telescopic pressing plates are arranged above the edge sealing platform, a heat sealing plate is arranged between the two telescopic pressing plates, and the heat sealing plate is higher than the telescopic pressing plates. After the heat sealing plate is lifted up through the lifting rod, the telescopic pressing plate is still pressed on the surface of a thin film, the thin film is separated from the heat sealing plate, the contact time of the heat sealing plate and the thin film is shortened, meanwhile, the scraping plates can scrape away thin film residues left at the end of the heat sealing plate, and therefore the heat sealing plate can be used for sealing the thin film. The flatness of the surface of the end of the heat sealing plate is further guaranteed, and the edge sealing effect is enhanced.

Description

Technical Field

[0001] The utility model relates to the field of film edge sealing, in particular to a plastic film edge sealing device. Background Art

[0002] Plastic film is made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins, and is commonly used in food packaging and other fields. Usually, plastic film needs to be thermoplastically sealed when packaging is completed, and the edge sealing process usually requires a film edge sealing device. The film edge sealing device uses a heat sealing plate to heat the plastic film to a temperature close to the melting point, and then uses a pressing plate to press the two pieces of film together to achieve the purpose of bonding the two films. However, the traditional edge sealing device is prone to causing the heat sealing plate and the film to stick together after heating. After the heat sealing plate hot-presses the film, the molten film is easy to stick to the heat sealing plate, and the residual film residue will make the surface of the heating plate uneven as it accumulates over a long period of time, causing uneven heating of the film during edge sealing, affecting the effect of film edge sealing. Utility Model Content

[0003] The purpose of the utility model is to provide a plastic film edge sealing device for overcoming the above-mentioned defects in the prior art.

[0004] According to a plastic film edge sealing device of the utility model, two liftable telescopic pressure plates are arranged above the edge sealing platform, and a heat sealing plate that can move up and down is arranged between the two telescopic pressure plates. The highest position of the heat sealing plate is higher than the telescopic pressure plate, and the lowest position of the heat sealing plate is lower than the telescopic pressure plate. Two scrapers that can be displaced toward each other in the horizontal direction are arranged at the bottom of the heat sealing plate.

[0005] Through the above technical solution, after the heat sealing plate is lifted, the retractable pressure plate is still pressed on the surface of the film, so that the film and the heat sealing plate are separated, reducing the contact time between the heat sealing plate and the film. At the same time, the scraper can scrape off the film residue remaining at the end of the heat sealing plate, further ensuring the flatness of the end surface of the heat sealing plate and enhancing the edge sealing effect.

[0006] The utility model is further configured such that the telescopic pressing plate has a telescopic stroke greater than or equal to the height difference between the bottom surface of the heat sealing plate and the bottom surface of the telescopic pressing plate.

[0007] The above technical solution ensures that the heat sealing plate can be smoothly lowered and abutted against the film, thereby improving the stability of the edge sealing process.

[0008] The utility model is further configured as follows: a support frame is provided on the surface of the workbench, a lifting cylinder is provided on the top of the support frame, a lifting rod is connected to the bottom of the lifting cylinder, and the telescopic pressing plate and the heat sealing plate are fixedly connected to the lifting rod.

[0009] Through the above technical solution, the lifting cylinder can simultaneously control the telescopic pressure plate and the heat sealing plate to move together, and cooperate with the telescopic movement of the telescopic pressure plate to achieve the heat sealing plate being separated from the film before the telescopic pressure plate.

[0010] The utility model is further configured as follows: a connecting rod is provided on the top of the support frame, the end of the connecting rod away from the support frame is fixedly connected to a positioning plate, the scraper is slidably connected to the positioning plate, and the two scrapers are fixedly connected to a telescopic cylinder on one side away from the heat sealing plate, and the telescopic cylinder is fixedly connected to the upper part of the positioning plate.

[0011] Through the above technical solution, the scraper is slidably connected to the positioning plate, ensuring the determination of the scraper height. At the same time, the horizontal displacement of the scraper is controlled by the telescopic cylinder, ensuring the smooth movement of the scraper and improving the stability of the scraper when scraping off the film residue at the end of the heat sealing plate.

[0012] The utility model is further configured as follows: the bottom surface of the heat sealing plate abuts against the top surface of the scraper.

[0013] By means of the above technical solution, the end of the heat sealing plate is ensured to be in full contact with the top surface of the scraper, thereby ensuring the effect of the scraper in scraping off the film residue.

[0014] The utility model is further configured such that the distance over which the two scrapers can be relatively displaced in the horizontal direction is greater than the width of the heat sealing plate.

[0015] Through the above technical solution, the horizontal displacement distance of the scraper is greater than the width of the heat sealing plate, which can make the heat sealing plate descend smoothly, while ensuring that the scraper can fully scrape off the film residue on the bottom surface of the heat sealing plate, thereby improving the cleaning effect of the scraper.

[0016] The beneficial effects of the utility model are as follows: after the edge sealing process is completed, the heat sealing plate and the telescopic pressing plate are lifted, and the telescopic pressing plate is still pressed on the surface of the film, so that the film will not be lifted together with the heat sealing plate, thereby reducing the contact time between the heat sealing plate and the film. At the same time, the scraper can scrape off the film residue remaining at the end of the heat sealing plate, further ensuring the flatness of the surface of the end of the heat sealing plate and enhancing the edge sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 This utility model Figure 1 A top view of

[0019] Figure 3 This utility model Figure 2 Schematic diagram of AA in the middle;

[0020] Figure 4 This is a schematic diagram of the scraper structure of the utility model;

[0021] Figure 5 It is a schematic diagram of the internal structure of the scraper of the utility model.

[0022] In the figure: 1. Workbench; 2. Edge banding platform; 3. Lifting cylinder; 4. Lifting rod; 5. Telescopic pressure plate; 6. Connecting rod; 7. Heat sealing plate; 8. Positioning plate; 9. Scraper; 10. Support frame; 11. Telescopic cylinder. DETAILED DESCRIPTION

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the purpose of simplifying the description of the present invention, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0024] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the embodiments. It should be understood that the following text is merely used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention. As used herein, the terms up and down and left and right are not limited to their strict geometric definitions, but include reasonable and inconsistent tolerances for machining or human errors. The specific features of the plastic film edge sealing device are described in detail below:

[0025] An embodiment of the present invention:

[0026] Reference Figure 1-Figure 5 The utility model provides a plastic film edge sealing device. Two liftable telescopic pressing plates 5 are arranged above the edge sealing platform 2. A heat sealing plate 7 that can move up and down is arranged between the two telescopic pressing plates 5. The highest position of the heat sealing plate 7 is higher than the telescopic pressing plate 5, and the lowest position of the heat sealing plate 7 is lower than the telescopic pressing plate 5. Two scrapers 9 that can be displaced toward each other in the horizontal direction are arranged at the bottom of the heat sealing plate 7.

[0027] refer to Figure 1-Figure 3As shown, a support frame 10 is provided on the surface of the workbench 1, and a lifting cylinder 3 is provided on the top of the support frame 10. A lifting rod 4 is connected to the bottom of the lifting cylinder 3. The lifting cylinder 3 drives the lifting rod 4 to perform lifting and lowering movements through its own lifting. The telescopic pressure plate 5 is driven by a hydraulic cylinder to move up and down. The telescopic rod is retracted and extended by a spring arranged at its end. The telescopic pressure plate 5 is fixedly connected to the lifting rod 4 through the telescopic rod, and the two telescopic pressure plates 5 are respectively fixedly connected to both sides of the lifting rod 4; a heat sealing plate 7 is fixedly connected to the middle position of the lifting rod 4, and the heat sealing plate 7 is higher than the telescopic pressure plate 5. The telescopic stroke of the telescopic pressure plate 5 is greater than or equal to the height difference between the bottom surface of the heat sealing plate 7 and the bottom surface of the telescopic pressure plate 5.

[0028] refer to Figure 4 、 Figure 5 As shown, two connecting rods 6 are symmetrically arranged on the top of the support frame 10, and the two connecting rods 6 are fixedly connected to two positioning plates 8 at one end away from the support frame 10. The two positioning plates 8 are located on the left and right sides of the heat sealing plate 7. The vertical cross-section of the positioning plate 8 is L-shaped, and a sliding rod is provided above the scraper 9. A sliding groove is provided at the top wall of the positioning plate 8. The scraper 9 is slidably connected to the positioning plate 8 through the sliding rod. The two scrapers 9 are fixedly connected to the side away from the heat sealing plate 7 with a telescopic cylinder 11. The telescopic cylinder 11 is fixedly connected to the side wall of the positioning plate 8. The bottom surface of the heat sealing plate 7 abuts against the top surface of the scraper 9. The distance of the relative displacement of the two scrapers 9 in the horizontal direction is greater than the width of the heat sealing plate 7.

[0029] refer to Figure 5 As shown, the middle part of the lower end of the heat sealing plate 7 is a plane, and its two sides are upward inclined slopes. The two scrapers 9 are provided with grooves with the same cross-section as the lower end of the heat sealing plate 7 at one end close to the heat sealing plate 7. The lower end of the heat sealing plate 7 abuts against the bottom wall of the groove. This structural design ensures that the end of the heat sealing plate 7 is in full contact with the scraper 9 and reduces the contact area between the heat sealing plate 7 and the film, which is beneficial to reducing the residual film at the end of the heat sealing plate 7.

[0030] A conveying device is provided on the workbench 1, and the plastic film is placed on the conveying device. The conveying device is driven by a motor to convey the film to the edge sealing platform 2. At this time, the lower end of the heat sealing plate 7 connected in the middle of the lifting rod 4 abuts against the groove of the scraper 9. The operator starts the telescopic cylinder 11 to retract, thereby driving the left and right scrapers 9 to move away from each other in the horizontal direction. When the distance between the two scrapers 9 is greater than the horizontal width of the end of the heat sealing plate 7, the lifting rod 4 moves downward with the heat sealing plate 7 and the telescopic pressure plate 5.

[0031] The telescopic pressing plate 5 first contacts with the plastic film, shrinks and presses the film, and the heat sealing plate 7 then contacts the position where the edge of the film needs to be sealed and performs heat sealing. When the heat sealing plate 7 completes its work, the lifting cylinder 3 drives the lifting rod 4 to lift, and the lifting of the lifting rod 4 drives the heat sealing plate 7 to lift. The telescopic rod in the telescopic pressing plate 5 extends under the action of its internal spring. At this time, the telescopic pressing plate 5 is still pressed on the surface of the film. At this time, the heat sealing plate 7 gradually separates from the film, and the lifting rod 4 continues to lift. When the telescopic rod in the telescopic pressing plate 5 is reset, the lifting of the lifting rod 4 causes the telescopic pressing plate 5 to separate from the film. When the bottom surface of the heat sealing plate 7 rises to be flush with the top surface of the scraper 9, the operator closes the lifting cylinder 3. At this time, the lifting rod 4 stops working, and the operator turns on the telescopic cylinder 11. The telescopic cylinder 11 pushes the scrapers 9 on both sides to move horizontally relative to each other. When the two scrapers 9 are moving relative to each other, their top surfaces slide and rub against the bottom surface of the heat sealing plate 7, thereby scraping off the film residue remaining at the end of the heat sealing plate 7.

[0032] It will be clear to those skilled in the art that various modifications to the above embodiments may be made without departing from the overall spirit and concept of the present invention. All such modifications fall within the scope of protection of the present invention. The protection scheme of the present invention shall be subject to the claims appended hereto.

Claims

1. A plastic film edge sealing device, comprising a workbench (1) and an edge sealing platform (2), characterized in that: Two elevating retractable pressure plates (5) are provided above the edge sealing platform (2); a heat sealing plate (7) that can be moved up and down is provided between the two retractable pressure plates (5); the highest position of the heat sealing plate (7) is higher than the retractable pressure plate (5); the lowest position of the heat sealing plate (7) is lower than the retractable pressure plate (5); and two scrapers (9) that can be displaced toward each other in the horizontal direction are provided at the bottom of the heat sealing plate (7).

2. The plastic film edge sealing device according to claim 1, characterized in that: The telescopic pressing plate (5) has a telescopic travel greater than the height difference between the bottom surface of the heat sealing plate (7) and the bottom surface of the telescopic pressing plate (5).

3. The plastic film edge sealing device according to claim 1, characterized in that: The surface of the workbench (1) is fixedly connected to a support frame (10), a lifting cylinder (3) is provided on the top of the support frame (10), the lower end of the piston rod of the lifting cylinder (3) is fixedly connected to a lifting rod (4), and the telescopic pressing plate (5) and the heat sealing plate (7) are both fixedly connected to the lifting rod (4).

4. The plastic film edge sealing device according to claim 3, characterized in that: A connecting rod (6) is provided on the top of the support frame (10), and one end of the connecting rod (6) away from the support frame (10) is fixedly connected to a positioning plate (8), and the scraper (9) is slidably connected to the positioning plate (8), and one side of the two scrapers (9) away from the heat sealing plate (7) is fixedly connected to a telescopic cylinder (11), and the telescopic cylinder (11) is fixedly connected to the top of the positioning plate (8).

5. The plastic film edge sealing device according to claim 1, characterized in that: The bottom surface of the heat sealing plate (7) abuts against the top surface of the scraper (9).

6. The plastic film edge sealing device according to claim 1, characterized in that: The relative displacement distance of the two scrapers (9) in the horizontal direction is greater than the width of the heat sealing plate (7).

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