A film assembly

Abstract

The utility model discloses a kind of film-wrapped components, it is related to packaging equipment technical field, including: rack, unwinding device, supporting plate, film pulling device, film cutting device, hot-pressing device.Unwinding device is connected to rack, unwinding device is configured as the roll stock for storing film;Supporting plate is connected to rack, supporting plate is configured as for supporting special-shaped bottle;Film pulling device is connected to rack, film pulling device is used to hold film and drive film to move, film pulling device is configured as can drive the film in unwinding device to pass above supporting plate;Film cutting device is connected to rack, film cutting device is configured as for cutting the film between unwinding device and supporting plate;Hot-pressing device is connected to rack, hot-pressing device is configured as for to film hot-melt edge sealing.The utility model can improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of packaging equipment technology, and in particular to a wrapping component. Background Technology

[0002] Existing bottle wrapping machines are generally designed according to conventional wrapping patterns and film materials, and do not have the function of packing according to specific needs. They cannot meet special wrapping and stacking requirements, and require manual feeding of each item onto the wrapping machine. After wrapping, the items are then manually sent to the case packing machine for stacking and packing, making it difficult to carry out large-scale automated production. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a coating assembly that can improve production efficiency.

[0004] A coating assembly according to a first aspect of the present invention includes: a frame, an unwinding device, a tray, a film stretching device, a film cutting device, and a hot pressing device. The unwinding device is connected to the frame and configured to store a roll of film. The tray is connected to the frame and configured to support irregularly shaped bottles. The film stretching device is connected to the frame and configured to clamp the film and move it, and is configured to move the film from the unwinding device over the tray. The film cutting device is connected to the frame and configured to cut the film between the unwinding device and the tray. The hot pressing device is connected to the frame and configured to heat-seal the edges of the film.

[0005] A film-coating assembly according to an embodiment of the present invention has at least the following beneficial effects: by integrating an unwinding device, a pallet, a film-pulling device, a film-cutting device, and a hot-pressing device into a frame, automated operation of film-coating irregularly shaped bottles is achieved. The unwinding device stores and supplies film rolls, the film-pulling device actively pulls the film above the pallet, replacing manual film pulling and ensuring conveying accuracy and reliability; the film-cutting device automatically cuts the film, and the hot-pressing device completes the heat-sealing. The entire process achieves automatic film conveying, positioning, cutting, and sealing through mechanical linkage, reducing manual intervention and thus improving production efficiency.

[0006] According to some embodiments of the present invention, the coating assembly further includes a film pressing device, which is connected to the frame and located between the unwinding device and the cutting device. The film passes through the film pressing device, and the film pressing device is used to apply frictional force to the film.

[0007] According to some embodiments of the present invention, the film pressing device includes a fixed roller, a nylon roller, and an eighth cylinder. The axes of the fixed roller and the nylon roller are parallel to each other. The film is passed between the fixed roller and the nylon roller. The eighth cylinder is driven to the nylon roller to adjust the distance between the nylon roller and the fixed roller.

[0008] According to some embodiments of the present invention, the coating assembly further includes a film clamping device, which is connected to the frame and located between the film cutting device and the film pressing device. The film clamping device is used to clamp the film.

[0009] According to some embodiments of the present invention, the film clamping device includes a third air gripper and two first clamping plates, the two first clamping plates being connected to the third air gripper, and the third air gripper being used to drive the two first clamping plates to move closer to or separate from each other in order to clamp the film or release the film.

[0010] According to some embodiments of the present invention, the unwinding device includes a tension shaft, a slide, and multiple guide rollers. The tension shaft and the multiple guide rollers are rotatably connected to the slide. The tension shaft is fitted with a roll of the film. The film is wound around the multiple guide rollers and passes through the film pressing device, the film clamping device, the film cutting device, and the film stretching device.

[0011] According to some embodiments of the present invention, the film-pulling device includes a fourteenth cylinder, a fixed clamping block, and a movable clamping block. A clamping space for clamping the film is formed between the fixed clamping block and the movable clamping block. The fourteenth cylinder is connected to the movable clamping block to drive the movable clamping block and the fixed clamping block to separate or move closer together. The film-pulling device is configured to clamp the film and drive the film to move.

[0012] According to some embodiments of the present invention, the film cutting device includes a cutter, a second fixed plate, a ninth cylinder, a first pressure plate, a first spring, a fourth pressure plate, and a tenth cylinder. The first pressure plate and the fourth pressure plate are spaced apart in the vertical direction. Two first springs are provided and connected between the first pressure plate and the fourth pressure plate. The cutter is connected to the second fixed plate, and the second fixed plate is connected to the first pressure plate. The ninth cylinder is driven to the fourth pressure plate to drive the fourth pressure plate and the first pressure plate to move up and down. The tenth cylinder is used to drive the second fixed plate to move, thereby driving the cutter to move along the length direction of the first pressure plate.

[0013] According to some embodiments of this utility model, the hot pressing device includes a front hot pressing device and a rear hot pressing device. The front hot pressing device and the rear hot pressing device are respectively used to heat seal the film after stretching. The front hot pressing device includes an eleventh cylinder, a third push plate, a first guide post, a second pressure plate, a twelfth cylinder, a second guide post, a fourth push plate, and a first heat sealing plate. The third push plate and the second pressure plate are connected through the first guide post. The eleventh cylinder is connected to the third push plate to drive the third push plate, the first guide post, and the second pressure plate to move up and down. The fourth push plate and the first heat sealing plate are connected through the second guide post. The twelfth cylinder is connected to the fourth push plate to drive the fourth push plate, the second guide post, and the first heat sealing plate to move up and down.

[0014] According to some embodiments of the present invention, the hot pressing device further includes a lower hot pressing device, which includes a thirteenth cylinder, a third pressure plate, a fifth push plate, a second spring, and a second heat sealing plate. The third pressure plate is located below the fifth push plate, and the third pressure plate and the fifth push plate are connected by the second spring. The second heat sealing plate is connected to the fifth push plate and is located between the fifth push plate and the third pressure plate. The third pressure plate is provided with a clearance groove for the second heat sealing plate to pass through. The thirteenth cylinder and the fifth push plate are drivenly connected.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the installation structure of one embodiment of the present utility model; Figure 2 This is a schematic diagram of an embodiment of the unwinding device of this utility model; Figure 3 This is a schematic diagram of a film-cutting device according to an embodiment of the present invention; Figure 4 This is a side view of a film-cutting device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a film pressing device according to an embodiment of the present invention; Figure 6 This is a schematic diagram of a front hot pressing device according to an embodiment of the present invention; Figure 7 This is a schematic diagram of a membrane clamping device according to an embodiment of the present invention; Figure 8 This is a schematic diagram of a lower hot pressing device according to an embodiment of the present invention; Figure 9 This is a schematic diagram of a film-stretching device according to an embodiment of the present invention; Figure 10 This is a schematic diagram of step one of an embodiment of the present utility model; Figure 11 This is a schematic diagram of step two in one embodiment of the present utility model; Figure 12 This is a schematic diagram of step three of an embodiment of the present invention.

[0017] Icon labels: 100 racks; Unwinding device 200, expansion shaft 210, slide 220, guide roller 230; Film 300; Pallet 400; 500 irregularly shaped bottles; Film stretching device 600, fourteenth cylinder 610, fixed clamping block 620, movable clamping block 630, lifting cylinder 476, fifteenth cylinder 477, first servo module 471; Cutting blade 710, second fixing plate 720, ninth cylinder 730, first pressure plate 740, first spring 750, fourth pressure plate 760, tenth cylinder 770; Hot pressing device 800, front hot pressing device 810, eleventh cylinder 811, third push plate 812, first guide post 813, second pressure plate 814, twelfth cylinder 815, second guide post 816, fourth push plate 817, first heat sealing plate 818, rear hot pressing device 820, lower hot pressing device 830, thirteenth cylinder 831, third pressure plate 832, fifth push plate 833, second spring 834, second heat sealing plate 835; Film pressing device 900, fixed roller 910, nylon roller 920, eighth cylinder 930, film clamping device 940, third air gripper 941, first clamping plate 942. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] Reference Figures 1 to 12 As shown, a wrapping assembly according to one embodiment of the present invention includes: a frame 100, an unwinding device 200, a tray 400, a film stretching device 600, a film cutting device, and a hot pressing device 800. The unwinding device 200 is connected to the frame 100, and the film 300 is wound to form a roll of film 300. The unwinding device 200 is configured to store the roll of film 300. The tray 400 is bolted to the frame 100. The tray 400 is horizontally arranged and configured to support irregularly shaped bottles 500. During the wrapping process, the tray 400 serves to support the irregularly shaped bottles 500 and the film 300. A film-pulling device 600 is connected to the frame 100. The film-pulling device 600 clamps and moves the film 300. It is configured to move the film 300 from the unwinding device 200 over the pallet 400. The film-pulling device 600 actively clamps and pulls the film 300, ensuring that the film 300 is smoothly transported from the unwinding device 200 to a predetermined position above the pallet 400, which is more precise and reliable than relying on manual film pulling. A film-cutting device is connected to the frame 100 and configured to cut the film 300 between the unwinding device 200 and the pallet 400. A heat-sealing device 800 is connected to the frame 100 and configured to heat-seal the edges of the film 300. This automated process significantly reduces manual operation steps and greatly improves packaging speed and overall production efficiency.

[0023] Reference Figure 1 and Figure 5As shown, the wrapping assembly also includes a film-pressing device 900, which is connected to the frame 100 and located between the unwinding device 200 and the film-cutting device. The film 300 passes through the film-pressing device 900, which actively applies an adjustable frictional force to the film 300. Stable tension is crucial for the flatness of the film 300. The film-pressing device 900 ensures that the film 300 remains under appropriate tension throughout its transport to the pallet 400 and during the wrapping of the irregularly shaped bottle 500, maintaining suitable friction to prevent wrinkles.

[0024] Reference Figure 1 and Figure 5 As shown, the film pressing device 900 includes a fixed roller 910, a nylon roller 920, and an eighth cylinder 930. The fixed roller 910 is rotatably mounted on the frame 100. The axes of the fixed roller 910 and the nylon roller 920 are parallel to each other. The film 300 passes between the fixed roller 910 and the nylon roller 920. The nylon material has moderate hardness and a smooth surface, providing flexible friction when in contact with the film 300, reducing the risk of scratching or damaging the film 300. The fixed end of the eighth cylinder 930 is connected to the frame 100. The eighth cylinder 930 is driven to the nylon roller 920 to adjust the distance between the nylon roller 920 and the fixed roller 910. The air pressure of the eighth cylinder 930 can be adjusted as needed to maintain an appropriate and constant pressure on the film 300 by the nylon roller 920. When the film 300 needs to be passed through the fixed roller 910 and nylon roller 920 again after changing the roll of film 300, the eighth cylinder 930 can be pushed out, and the fixed roller 910 and nylon roller 920 can be separated to facilitate the passing of film 300.

[0025] Reference Figure 1 and Figure 7 As shown, the coating assembly also includes a clamping device 940, which is connected to the frame 100 and located between the film cutting device and the film pressing device 900. The clamping device 940 is used to clamp the film 300 near the film pressing device 900 after the film cutting device cuts the film 300. The clamping device 940 clamps the front end of the film 300 immediately after the film cutting device cuts the film 300, preventing the film 300 from retracting or shifting after cutting. This facilitates fixing the starting position of the film 300 clamped by the film pulling device 600 each time, providing a precise starting point for covering the irregularly shaped bottle 500.

[0026] Reference Figure 1 and Figure 7As shown, the film clamping device 940 includes a third pneumatic gripper 941 and two first clamping plates 942. The two first clamping plates 942 are connected to the third pneumatic gripper 941. Three nylon blocks are provided on the side of the first clamping plates 942 that are close to each other. The third pneumatic gripper 941 is used to move the two first clamping plates 942 closer together or separate them, so as to move the nylon blocks on the first clamping plates 942 to clamp or release the film 300. The third pneumatic gripper 941 ensures that the two first clamping plates 942 move in parallel through a mechanical structure, so that the pressure distribution on the force surface of the film 300 is uniform, avoiding deformation or damage to the film 300 caused by local stress. The third pneumatic gripper 941 closes to clamp the film 300 before the film cutting assembly cuts the film 300.

[0027] Reference Figure 1 and Figure 2 As shown, the unwinding device 200 includes a tension shaft 210, a slide 220, and multiple guide rollers 230. The tension shaft 210 and the multiple guide rollers 230 are rotatably connected to the slide 220. The tension shaft 210 internally supports the roll of film 300, causing it to rotate synchronously and unwind the film 300. The slide 220 is slidably mounted on the frame 100 via a linear guide rail. As an integral load-bearing unit, the slide 220 can move independently. When changing the roll of film 300, the slide 220 can be moved out entirely by means of a cylinder or manually, allowing for the installation of a new roll in a relatively spacious area, significantly reducing production line downtime. The tension shaft 210 is fitted with the roll of film 300. The film 300 of the roll is wound around the multiple guide rollers 230 and passes through the film pressing device 900, the film clamping device 940, the film cutting device 950, and the film stretching device 600. Multiple guide rollers 230 guide the film 300 to form an S-shaped winding path, eliminating the shaking caused by unwinding inertia, suppressing the film 300 from deviating, and ensuring that the film 300 entering the laminating device 900 is smooth and wrinkle-free.

[0028] Reference Figure 1 , Figure 2 and Figure 9As shown, the film stretching device 600 includes a fourteenth cylinder 610, a fixed clamping block 620, and a movable clamping block 630. A clamping space for holding the film 300 is formed between the fixed clamping block 620 and the movable clamping block 630. The fourteenth cylinder 610 is connected to the movable clamping block 630 to cause the movable clamping block 630 to separate or move closer to the fixed clamping block 620. The film stretching device 600 is configured to clamp the film 300 and move it. After the fourteenth cylinder 610 rises, causing the movable clamping block 630 to rise and release the clamp, the fifteenth cylinder 477 retracts, pulling the film stretching device 600 backward. The first servo module 471 drives the entire film stretching device 600 from right to left on the support plate 400. The first servo module 471 uses a linear cylinder or a servo motor with a synchronous belt for drive. The film-pulling device 600 moves between the film-clamping device 940 and the film-pressing device 900. The fifteenth cylinder 477 pushes the film-pulling device 600 forward. At this time, the fixed clamping block 620 is below the film 300. The fourteenth cylinder 610 presses down, driving the movable clamping block 630 to clamp the film 300. The fifteenth cylinder 477 and the first servo module 471 drive the fixed clamping block 620 and the movable clamping block 630 to bypass the tray 400 to clamp the film 300, preventing the fixed clamping block 620 from interfering with or colliding with the irregularly shaped bottle 500 on the tray 400. It is foreseeable that the film stretching device 600 also includes a lifting cylinder 476. The fixed end of the lifting cylinder 476 is connected to the movable end of the first servo module 471, and the movable end of the lifting cylinder 476 is connected to the fixed end of the fourteenth cylinder 610. The fixed clamping block 620 is connected to the movable end of the lifting cylinder 476. The lifting cylinder 476 is used to control the height of the film 300 after it is clamped. When the film stretching device 600 stretches the film 300 to form the lower film, middle film and upper film, the height of the film 300 is adjusted by the lifting cylinder 476 to adapt to the process requirements.

[0029] Reference Figure 9As shown, the film cutting device includes a cutter 710, a second fixing plate 720, a ninth cylinder 730, a first pressure plate 740, a first spring 750, a fourth pressure plate 760, and a tenth cylinder 770. The cutter 710 has a beveled blade. The first pressure plate 740 and the fourth pressure plate 760 are spaced apart in the vertical direction. Two first springs 750 are provided and connected between the first pressure plate 740 and the fourth pressure plate 760. The two first springs 750 are connected between the first pressure plate 740 and the fourth pressure plate 760 to elastically press the film 300. This allows the first pressure plate 740 to adaptively apply uniform pressure when pressing the film 300, preventing damage to the film 300 and effectively preventing the film 300 from slipping. The cutter 710 is connected to the second fixed plate 720, which is connected to the first pressure plate 740. The ninth cylinder 730 and the fourth pressure plate 760 are driven together to move the fourth pressure plate 760 and the first pressure plate 740 up and down. The tenth cylinder 770 drives the second fixed plate 720 to move, causing the cutter 710 to move along the length of the first pressure plate 740. The cutter 710 moves with the second fixed plate 720 to cut the film 300, thus completing the film cutting operation. The ninth cylinder 730 drives the fourth pressure plate 760 downwards, and the first spring 750 presses down the first pressure plate 740 together, thus firmly pressing and fixing the film 300 from both sides before the cutter 710 moves. This avoids skewed cutting caused by loosening or stretching of the film 300. The ninth cylinder 730 provides vertical clamping force, while the tenth cylinder 770 drives the cutter 710 to complete the horizontal cutting motion. This functional separation design allows for the selection of the most suitable cylinder for each action.

[0030] Reference Figure 1 , Figure 3 and Figure 6As shown, it can be understood that the hot pressing device 800 includes a front hot pressing device 810, a rear hot pressing device 820, and a lower hot pressing device 830. The front hot pressing device 810 and the rear hot pressing device 820 are used to heat seal the film 300 after stretching. The structure of the rear hot pressing device 820 is the same as that of the front hot pressing device 810. The front hot pressing device 810 includes an eleventh cylinder 811, a third push plate 812, a first guide post 813, a second pressure plate 814, a twelfth cylinder 815, a second guide post 816, a fourth push plate 817, and a first heat sealing plate 818. The third push plate 812 and the second pressure plate 830... Plates 814 are connected by a first guide post 813. An eleventh cylinder 811 is connected to a third push plate 812 to drive the third push plate 812, the first guide post 813, and the second pressure plate 814 to move up and down. A fourth push plate 817 and a first heat-sealing plate 818 are connected by a second guide post 816. A twelfth cylinder 815 is connected to the fourth push plate 817 to drive the fourth push plate 817, the second guide post 816, and the first heat-sealing plate 818 to move up and down. The first guide post 813 and the second guide post 816 ensure that the second pressure plate 814 and the first heat-sealing plate 818 move vertically up and down. The lower hot-pressing device 830 includes a thirteenth cylinder 831, a third pressure plate 832, a fifth push plate 833, a second spring 834, and a second heat-sealing plate 835. The third pressure plate 832 is located below the fifth push plate 833, and the third pressure plate 832 and the fifth push plate 833 are connected by the second spring 834. The second heat-sealing plate 835 is connected to the fifth push plate 833 and is located between the fifth push plate 833 and the third pressure plate 832. The third pressure plate 832 has a clearance groove for the second heat-sealing plate 835 to pass through. The thirteenth cylinder 831 and the fifth push plate 833 are driven together. Pressing and heat sealing are driven by two separate cylinders. This functional separation design allows the selection of the most suitable cylinder for each action. Because the lower hot pressing device 830 is relatively long, the third pressure plate 832, the fifth push plate 833 and the second spring 834 of the lower hot pressing device 830 form a floating pressure mechanism, which can automatically compensate for the differences caused by irregularly shaped bottles 500 with different heights, curvatures or shapes, and ensure uniform pressure distribution.

[0031] Usage steps: Step 1: The front hot pressing device 810, rear hot pressing device 820, and lower hot pressing device 830 are all in their initial state, i.e., not in contact with the pallet 400. The film clamping assembly opens the first servo module 471, driving the film pulling device 600 to move from the left to the right of the pallet 400 to pull out the film 300 as the lower layer film. The eleventh cylinder 811 on the front hot pressing device 810 and the rear hot pressing device 820 retracts, driving the second pressure plate 814 to press down, pressing both ends of the film 300 tightly onto the pallet 400. The film clamping device 940 clamps the film 300, and the film cutting device cuts the film 300. Step two: The transport device for the irregularly shaped bottles 500 arranges multiple irregularly shaped bottles 500 into two staggered rows on the pallet 400. The film-pulling device 600 avoids the irregularly shaped bottles 500 and moves between the film-clamping device 940 and the film-cutting device. The fixed clamping block 620 and the movable clamping block 630 clamp the cut ends of the film 300. The film-clamping device 940 opens, and the eleventh cylinder 811 on the front hot-pressing device 810 and the rear hot-pressing device 820 extends, driving the second pressure plate 814 to rise, releasing the two ends of the lower film. The lifting cylinder 476 drives the fixed clamping block 620, the movable clamping block 630, and the fourteenth cylinder 610 to... After being raised to a position offset from the irregularly shaped bottles 500, at the corresponding height between the upper and lower rows of irregularly shaped bottles 500, the film pulling device 600 pulls the film 300 from the unwinding device 200 to the tray 400 as the middle layer film. The middle layer film is located between the upper and lower rows of irregularly shaped bottles 500. The transport device for the irregularly shaped bottles 500 moves the upper layer of irregularly shaped bottles 500 to its original position, causing the flat middle layer film to be pressed into a serpentine wrapping state. The eleventh cylinder 811 on the front hot pressing device 810 and the rear hot pressing device 820 retracts, driving the second pressure plate 814 to press down, pressing both ends of the lower and middle layers of film tightly onto the platform plate at the same time. The film pulling device 600 then retracts. At the same time, the film clamping device 940 closes the film clamp, and the film cutting device cuts the film.

[0032] Step 3: The hot-pressing device 800 releases the fixation of the lower and middle layers of film on the pallet 400. The fixed clamping block 620 and the movable clamping block 630 clamp the cut end of the film 300. The film clamping device 940 opens, and the lifting cylinder 476 maintains the height of the film 300 at when the middle layer of film is being pulled. The first servo module 471 pulls the film 300 from the unwinding device 200 onto the pallet 400 as the upper layer of film. The hot-pressing device 800 fixes the lower, middle, and upper layers of film on the pallet 400. The film clamping device 940 closes the clamping device, and the film cutting device cuts the film. The hot-pressing device 800 heat-seales the lower, middle, and upper layers of film in three directions to form a strip bag wrapping structure.

[0033] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A package assembly, characterized by, include: Rack (100); An unwinding device (200) is connected to the frame (100) and is configured to store rolls of film (300); A tray (400) is connected to the frame (100) and the tray (400) is configured to support irregularly shaped bottles (500). A film-pulling device (600) is connected to the frame (100). The film-pulling device (600) is used to clamp the film (300) and move the film (300). The film-pulling device (600) is configured to move the film (300) in the unwinding device (200) over the tray (400). A film cutting device (700) is connected to the frame (100) and is configured to cut the film (300) between the unwinding device (200) and the tray (400). A hot press device (800) is connected to the frame (100) and is configured to heat-seal the edges of the film (300).

2. The envelope assembly of claim 1, wherein: The coating assembly further includes a pressing device (900) connected to the frame (100), the pressing device (900) being located between the unwinding device (200) and the cutting device (700), the film (300) passing through the pressing device (900), and the pressing device (900) being used to apply frictional force to the film (300).

3. The envelope assembly of claim 2, wherein: The film pressing device (900) includes a fixed roller (910), a nylon roller (920), and an eighth cylinder (930). The axes of the fixed roller (910) and the nylon roller (920) are parallel to each other. The film (300) is passed between the fixed roller (910) and the nylon roller (920). The eighth cylinder (930) is driven to the nylon roller (920) to adjust the distance between the nylon roller (920) and the fixed roller (910).

4. The envelope assembly of claim 3, wherein: The coating assembly further includes a clamping device (940) connected to the frame (100), the clamping device (940) being located between the film cutting device (700) and the film pressing device (900), and the clamping device (940) being used to clamp the film (300).

5. The envelope assembly of claim 4, wherein: The film clamping device (940) includes a third air gripper (941) and two first clamping plates (942). The two first clamping plates (942) are connected to the third air gripper (941). The third air gripper (941) is used to drive the two first clamping plates (942) to move closer to each other or separate, so as to clamp the film (300) or release the film (300).

6. The envelope assembly of claim 5, wherein: The unwinding device (200) includes a tension shaft (210), a carriage (220) and a plurality of guide rollers (230). The tension shaft (210) and the plurality of guide rollers (230) are rotatably connected to the carriage (220). The tension shaft (210) is fitted with a roll of the film (300). The film (300) is wound around the plurality of guide rollers (230) and passes through the film pressing device (900), the film clamping device (940), the film cutting device (700) and the film stretching device (600).

7. The envelope assembly of claim 6, wherein: The film-pulling device (600) includes a fourteenth cylinder (610), a fixed clamping block (620), and a movable clamping block (630). A clamping space for clamping the film (300) is formed between the fixed clamping block (620) and the movable clamping block (630). The fourteenth cylinder (610) is connected to the movable clamping block (630) to drive the movable clamping block (630) and the fixed clamping block (620) to separate or move closer together. The film-pulling device (600) is configured to clamp the film (300) and drive the film (300) to move.

8. The envelope assembly of claim 7, wherein: The film cutting device (700) includes a cutter (710), a second fixed plate (720), a ninth cylinder (730), a first pressure plate (740), a first spring (750), a fourth pressure plate (760), and a tenth cylinder (770). The first pressure plate (740) and the fourth pressure plate (760) are spaced apart in the vertical direction. Two first springs (750) are provided and connected between the first pressure plate (740) and the fourth pressure plate (760). The cutter (710) is connected to the second fixed plate (720), and the second fixed plate (720) is connected to the first pressure plate (740). The ninth cylinder (730) and the fourth pressure plate (760) are driven to drive the fourth pressure plate (760) and the first pressure plate (740) to move up and down. The tenth cylinder (770) is used to drive the second fixed plate (720) to move, so as to drive the cutter (710) to move along the length direction of the first pressure plate (740).

9. The envelope assembly of claim 1, wherein: The hot pressing device (800) includes a front hot pressing device (810) and a rear hot pressing device (820). The front hot pressing device (810) and the rear hot pressing device (820) are respectively used to heat seal the film (300) after film stretching. The front hot pressing device (810) includes an eleventh cylinder (811), a third push plate (812), a first guide post (813), a second pressure plate (814), a twelfth cylinder (815), a second guide post (816), a fourth push plate (817), and a first heat sealing plate (818). The third push plate (812) and the second pressure plate (814) The first guide post (813) connects the eleventh cylinder (811) and the third push plate (812) to drive the third push plate (812), the first guide post (813) and the second pressure plate (814) to move up and down; the second push plate (817) and the first heat sealing plate (818) are connected by the second guide post (816), and the twelfth cylinder (815) is connected by the fourth push plate (817) to drive the fourth push plate (817), the second guide post (816) and the first heat sealing plate (818) to move up and down.

10. The envelope assembly of claim 9, wherein: The hot pressing device (800) further includes a lower hot pressing device (830), which includes a thirteenth cylinder (831), a third pressure plate (832), a fifth push plate (833), a second spring (834), and a second heat sealing plate (835). The third pressure plate (832) is located below the fifth push plate (833), and the third pressure plate (832) and the fifth push plate (833) are connected by the second spring (834). The second heat sealing plate (835) is connected to the fifth push plate (833) and is located between the fifth push plate (833) and the third pressure plate (832). The third pressure plate (832) is provided with a clearance groove for the second heat sealing plate (835) to pass through. The thirteenth cylinder (831) and the fifth push plate (833) are drivenly connected.

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