Food packaging film laminating and printing equipment and using method thereof

Abstract

The invention relates to the technical field of film covering equipment, in particular to food packaging film covering and printing equipment and a using method thereof, and the food packaging film covering and printing equipment comprises a rack, an unwinding structure, a driving structure, an adjusting structure, a film covering structure, a composite structure, a limiting structure, a packaging bag and a protective film; the unwinding roller, the winding roller and the film roller are easy to install, the height of the composite structure can be adjusted, the composite structure can be conveniently matched with protective films and packaging bags of different specifications, and meanwhile the operation difficulty of the packaging bags passing through the rollers is reduced; power transmission in the driving structure is stable and reliable, synchronous and constant-speed rotation of the unwinding roller and the winding roller is guaranteed, the service life of equipment is prolonged, the belt tension can be conveniently adjusted through the adjusting structure, the driving effect is optimized, and the overall working efficiency is improved; the packaging bag is evenly and tightly covered with the protective film through the film covering structure, the film covering quality and stability are guaranteed, the position of the protective film is effectively limited through the limiting structure, the problems of deviation, wrinkling and the like in the film covering process are avoided, and the film covering precision and quality are further improved.

Description

Technical Field

[0001] The invention relates to the technical field of film laminating equipment, in particular to a food packaging film laminating and printing equipment and a use method thereof. Background Art

[0002] In modern industrial production, food packaging, as an important part of ensuring food safety and improving product image, has increasingly stringent requirements on packaging materials and processes. In order to improve the competitiveness of food packaging, many food packaging bags will be laminated, and food packaging film laminating and printing equipment will be used during lamination. Food packaging film laminating and printing equipment is a professional mechanical equipment used for laminating and printing food packaging films, which can improve packaging quality, extend the shelf life of food, and enhance the aesthetics of packaging and the attractiveness of goods.

[0003] However, traditional food packaging film laminating and printing equipment is not flexible enough when dealing with protective films and packaging bags of different specifications, and it is difficult to adjust the height of the composite roller, which not only increases the workload of operators, but also makes the operation of the packaging bag passing the roller complicated, affecting production efficiency. In addition, since it is difficult to accurately adapt to materials of different specifications, it is easy to cause poor laminating effects, such as the protective film and the packaging bag not fitting tightly, bubbles, etc., which reduces the packaging quality.

[0004] The power transmission stability of traditional laminating equipment is poor. When driving the unwinding roller and the winding roller to rotate, it is difficult to achieve synchronous and uniform speed operation, which not only produces large vibrations and shortens the service life of the equipment, but also affects the uniformity of the laminating, resulting in unstable product quality. At the same time, the belt tension is inconvenient to adjust, and the driving effect cannot be quickly optimized according to actual production needs, which prolongs the preparation time before the equipment starts and reduces the overall production efficiency.

[0005] Traditional laminating equipment cannot ensure that the protective film is evenly and tightly covered on the packaging bag, and problems such as inconsistent laminating thickness and partial uncovering may easily occur. The protective film is prone to deviation and wrinkles during the laminating process, which seriously affects the accuracy and quality of the lamination. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a food packaging film laminating and printing device and a method of using the same.

[0007] The present invention is achieved through the following technical solutions:

[0008] A food packaging film laminating and printing device comprises a frame, an unwinding structure arranged on the frame, a driving structure arranged on the frame, an adjusting structure arranged on the frame, a laminating structure arranged on the frame, a composite structure arranged on the frame, and a limiting structure arranged on the laminating structure;

[0009] The frame is fixedly connected with two first bearing seats and a first rotating shaft rotatably connected to the two first bearing seats, the first rotating shaft is fixedly connected with a winding roller, the frame is fixedly connected with two second bearing seats, the two second bearing seats are rotatably connected to the second rotating shaft, the second rotating shaft is fixedly connected to the first guide roller, the frame is fixedly connected with two third bearing seats, the two third bearing seats are rotatably connected to the second guide roller, the frame is fixedly connected with two fourth bearing seats, the two fourth bearing seats are rotatably connected to the third rotating shaft, the winding roller is fixedly connected to the third rotating shaft, the frame is fixedly connected with two fifth bearing seats, the two fifth bearing seats are rotatably connected to the top rollers, the unwinding roller is wound with a packaging bag, the other end of the packaging bag is wound around the winding roller, and the packaging bag passes around the first guide roller, the second guide roller and the top roller;

[0010] The composite structure includes a support plate and a second hydraulic rod fixedly connected to the support plate, the support plate is fixedly connected to the frame, the second hydraulic rod is fixedly connected to a connecting bar, two lifting frames are fixedly connected to the connecting bar, the two lifting frames are rotatably connected to guide shafts, and the lifting frames are slidably connected to the frame.

[0011] Specifically, two guide posts are fixedly connected to the connecting strip, and the guide posts are slidably connected to the supporting plate.

[0012] Specifically, the driving structure includes a first motor and a first pulley fixedly connected to the first motor, a second pulley fixedly connected to the second rotating shaft, a slide seat slidably connected to the frame, an adjusting wheel rotatably connected to the slide seat, a belt wrapped around the first pulley, the second pulley and the adjusting wheel, a first gear fixedly connected to the second rotating shaft, a rotating seat fixedly connected to the frame, a connecting shaft rotatably connected to the rotating seat, one end of the connecting shaft is fixedly connected to the second gear, the first gear is meshed with the second gear, the other end of the connecting shaft is fixedly connected to the third gear, and a fourth gear is fixedly connected to the first rotating shaft, and the third gear is meshed with the fourth gear.

[0013] Specifically, the frame is fixedly connected with a second motor, the second motor is fixedly connected with a fifth gear, the third rotating shaft is fixedly connected with a sixth gear, and the fifth gear is meshed with the sixth gear.

[0014] Specifically, the adjustment structure includes two fixed blocks and a screw rod rotatably connected to the two fixed blocks, and the screw rod is threadedly connected to the slide seat.

[0015] Specifically, a sliding block is fixedly connected to the sliding seat, the sliding block is slidably connected to the frame, and the end of the screw rod is slidably connected to a rotating rod with an I-shaped cross section.

[0016] Specifically, the coating structure includes two vertical frames and a sixth bearing seat fixedly connected to the vertical frames, the two sixth bearing seats are rotatably connected to film rollers, and a protective film is wrapped around the film rollers. The vertical frames are fixedly connected to a first hydraulic rod, and the bottom ends of the two first hydraulic rods are fixedly connected to a mounting frame, and two mounting bars are fixedly connected to the mounting frame, and a guide rod is rotatably connected between the two mounting bars, and the protective film bypasses the guide rod. The mounting frame is rotatably connected to a pressure roller, and the protective film bypasses the pressure roller.

[0017] Specifically, a third motor is fixedly connected to the mounting frame, and an output end of the third motor is fixedly connected to the pressure roller.

[0018] Specifically, the limiting structure includes a fixed frame and a third hydraulic rod fixedly connected to the fixed frame, the mounting frame is fixedly connected to the fixed frame, the telescopic end of the third hydraulic rod is fixedly connected to a push seat, the push seat is rotatably connected to two connecting rods, the connecting rods are rotatably connected to a limiting seat, the limiting seat is rotatably connected to a limiting wheel, the limiting wheel is in contact with a protective film, and a spring is fixedly connected between the limiting seat and the fixed frame.

[0019] A method for using a food packaging film laminating and printing device comprises the following steps:

[0020] S1: When it is necessary to cover the food packaging bag with a protective film, the unwinding roller and the winding roller for retracting the packaging bag can be installed on the corresponding bearing seats on the frame, and then the protective film can be installed on the film covering structure, the height of the composite structure can be adjusted, and then the protective film can be passed around the composite structure;

[0021] S2: Install the belt on the driving structure, adjust the tension of the belt through the adjusting structure, and then adjust the driving effect of the driving structure, make the protective film fit with the packaging bag through the lifting and lowering film covering structure, and then limit the bypassed protective film through the limiting structure;

[0022] S3: Start the drive structure to start the winding roller and the unwinding roller, and then wind up the packaging bag. At the same time, start the drive component on the laminating structure, and then cooperate with the unwinding structure to laminar the packaging bag. The laminated packaging bag is rolled up on the winding roller.

[0023] The beneficial effects of the present invention are:

[0024] (1) The food packaging film laminating and printing equipment and the method for using the same described in the present invention have a reeling structure on the frame and a composite structure on the frame. The reeling roller, the winding roller and the film roller are easy to install. The height of the composite structure is adjustable, which is convenient for adapting to protective films and packaging bags of different specifications, while reducing the difficulty of operating the packaging bag over the roller.

[0025] (2) The food packaging film laminating and printing equipment and the method of using the same described in the present invention have a driving structure and an adjusting structure on the frame. The meshing transmission of multiple gears and the connection of belts in the driving structure ensure stable and reliable power transmission, thereby ensuring the synchronous and uniform rotation of the unwinding roller and the winding roller, reducing vibration and noise during equipment operation, and extending the service life of the equipment. The adjusting structure can conveniently adjust the belt tension, optimize the driving effect, reduce the preparation time before equipment start-up, and improve the overall work efficiency.

[0026] (3) The food packaging film laminating and printing equipment and the method of using the same described in the present invention have a laminating structure on the frame, and a limiting structure on the laminating structure. The laminating structure enables the protective film to be evenly and tightly covered on the packaging bag, thereby ensuring the quality and stability of the laminating. The limiting structure effectively limits the position of the protective film, thereby avoiding problems such as offset and wrinkles during the laminating process, thereby further improving the accuracy and quality of the laminating. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the overall structure of a preferred embodiment of a food packaging film laminating and printing device provided by the present invention;

[0028] Figure 2 for Figure 1 An enlarged schematic diagram of the structure of section A is shown;

[0029] Figure 3 It is a schematic diagram of the connection structure between the second rotating shaft and the first gear of the present invention;

[0030] Figure 4 for Figure 3 An enlarged schematic diagram of the structure of part B is shown;

[0031] Figure 5 It is a schematic diagram of the connection structure between the second rotating shaft and the first pulley of the present invention;

[0032] Figure 6 for Figure 5 An enlarged schematic diagram of the C-section structure is shown;

[0033] Figure 7 It is a schematic diagram of the connection structure between the second rotating shaft and the first guide roller of the present invention;

[0034] Figure 8 for Figure 7 An enlarged schematic diagram of the D structure is shown.

[0035] In the figure: 1. frame; 2. unwinding structure; 201. first bearing seat; 202. first rotating shaft; 203. unwinding roller; 204. second bearing seat; 205. second rotating shaft; 206. first guide roller; 207. third bearing seat; 208. second guide roller; 209. fourth bearing seat; 210. third rotating shaft; 211. winding roller; 212. fifth bearing seat; 213. top roller; 3. driving structure; 301. first motor; 302. first pulley; 303. second pulley; 304. slide seat; 305. adjusting wheel; 306. first gear; 307. rotating seat; 308. connecting shaft; 309. second gear; 310. third gear; 311. fourth gear; 312. second motor; 313. fifth gear; 314, the sixth gear; 4, the adjusting structure; 401, the fixing block; 402, the screw rod; 403, the rotating rod; 404, the sliding block; 5, the coating structure; 501, the vertical frame; 502, the sixth bearing seat; 503, the film roller; 504, the first hydraulic rod; 505, the mounting frame; 506, the mounting strip; 507, the guide rod; 508, the pressure roller; 509, the third motor; 6, the composite structure; 601, the support plate; 602, the second hydraulic rod; 603, the connecting strip; 604, the guide column; 605, the lifting frame; 606, the guide shaft; 7, the limiting structure; 701, the fixing frame; 702, the third hydraulic rod; 703, the pushing seat; 704, the connecting rod; 705, the limiting seat; 706, the limiting wheel; 707, the spring; 8, the packaging bag; 9, the protective film. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0037] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0038] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside", etc. appear to indicate the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, a food packaging film laminating and printing device according to the present invention comprises a frame 1, a reeling structure 2 arranged on the frame 1, a driving structure 3 arranged on the frame 1, an adjusting structure 4 arranged on the frame 1, a laminating structure 5 arranged on the frame 1, a composite structure 6 arranged on the frame 1, and a limiting structure 7 arranged on the laminating structure 5;

[0040] The frame 1 is fixedly connected with two first bearing seats 201 and a first rotating shaft 202 rotatably connected to the two first bearing seats 201, the first rotating shaft 202 is fixedly connected with a reeling roller 203, the frame 1 is fixedly connected with two second bearing seats 204, the two second bearing seats 204 are rotatably connected with a second rotating shaft 205, the second rotating shaft 205 is fixedly connected with a first guide roller 206, the frame 1 is fixedly connected with two third bearing seats 207, the two third bearing seats 207 are rotatably connected with a second guide roller 2 08, two fourth bearing seats 209 are fixedly connected to the frame 1, and the two fourth bearing seats 209 are rotatably connected to the third rotating shaft 210, and the third rotating shaft 210 is fixedly connected to the winding roller 211, and two fifth bearing seats 212 are fixedly connected to the frame 1, and the two fifth bearing seats 212 are rotatably connected to the top roller 213, and the packaging bag 8 is wound around the unwinding roller 203, and the other end of the packaging bag 8 is wound around the winding roller 211, and the packaging bag 8 bypasses the first guide roller 206, the second guide roller 208 and the top roller 213;

[0041] The composite structure 6 includes a support plate 601 and a second hydraulic rod 602 fixedly connected to the support plate 601; the support plate 601 is fixedly connected to the frame 1; the second hydraulic rod 602 is fixedly connected to a connecting bar 603; two lifting frames 605 are fixedly connected to the connecting bar 603; the two lifting frames 605 are rotatably connected to a guide shaft 606; the lifting frames 605 are slidably connected to the frame 1; two guide columns 604 are fixedly connected to the connecting bar 603; the guide columns 604 are slidably connected to the support plate 601.

[0042] Specifically, Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 7As shown, the driving structure 3 includes a first motor 301 and a first pulley 302 fixedly connected to the first motor 301, a second pulley 303 fixedly connected to the second rotating shaft 205, a slide seat 304 slidably connected to the frame 1, an adjusting wheel 305 rotatably connected to the slide seat 304, a belt is wound around the first pulley 302, the second pulley 303 and the adjusting wheel 305, a first gear 306 fixedly connected to the second rotating shaft 205, a rotating seat 307 fixedly connected to the frame 1, and a connecting shaft 308 rotatably connected to the rotating seat 307 , one end of the connecting shaft 308 is fixedly connected to a second gear 309, the first gear 306 is meshed with the second gear 309, the other end of the connecting shaft 308 is fixedly connected to a third gear 310, the first rotating shaft 202 is fixedly connected to a fourth gear 311, the third gear 310 is meshed with the fourth gear 311; the frame 1 is fixedly connected to a second motor 312, the second motor 312 is fixedly connected to a fifth gear 313, the third rotating shaft 210 is fixedly connected to a sixth gear 314, the fifth gear 313 is meshed with the sixth gear 314;

[0043] The adjustment structure 4 includes two fixed blocks 401 and a screw 402 rotatably connected to the two fixed blocks 401, and the screw 402 is threadedly connected to the slide seat 304; a slider 404 is fixedly connected to the slide seat 304, and the slider 404 is slidably connected to the frame 1, and the end of the screw 402 is slidably connected to a rotating rod 403 with an "I"-shaped cross-section.

[0044] Specifically, Figure 1 , Figure 2 , Figure 5 , Figure 6 ,and Figure 8 As shown, the coating structure 5 includes two vertical frames 501 and a sixth bearing seat 502 fixedly connected to the vertical frames 501, the two sixth bearing seats 502 are rotatably connected with film rollers 503, and the film rollers 503 are wound with a protective film 9, the vertical frames 501 are fixedly connected with a first hydraulic rod 504, the bottom ends of the two first hydraulic rods 504 are fixedly connected with a mounting frame 505, the mounting frame 505 is fixedly connected with two mounting bars 506, a guide rod 507 is rotatably connected between the two mounting bars 506, and the protective film 9 bypasses the guide rod 507, the mounting frame 505 is rotatably connected with a pressure roller 508, and the protective film 9 bypasses the pressure roller 508; the mounting frame 505 is fixedly connected with a third motor 509, and the output end of the third motor 509 is fixedly connected to the pressure roller 508;

[0045] The limiting structure 7 includes a fixed frame 701 and a third hydraulic rod 702 fixedly connected to the fixed frame 701, the mounting frame 505 is fixedly connected to the fixed frame 701, the telescopic end of the third hydraulic rod 702 is fixedly connected to a push seat 703, the push seat 703 is rotatably connected to two connecting rods 704, the connecting rod 704 is rotatably connected to a limiting seat 705, the limiting seat 705 is rotatably connected to a limiting wheel 706, the limiting wheel 706 is in contact with the protective film 9, and a spring 707 is fixedly connected between the limiting seat 705 and the fixed frame 701.

[0046] A method for using a food packaging film laminating and printing device comprises the following steps:

[0047] S1: When the protective film 9 needs to be applied to the food packaging bag 8, the unwinding roller 203 and the rewinding roller 211 for retracting the packaging bag 8 can be first installed on the corresponding bearing seats on the frame 1, and then the protective film 9 can be installed on the film coating structure 5, the height of the composite structure 6 can be adjusted, and then the protective film 9 can be passed around the composite structure 6;

[0048] S2: Install the belt on the driving structure 3, adjust the tension of the belt by the adjusting structure 4, and then adjust the driving effect of the driving structure 3, make the protective film 9 fit with the packaging bag 8 by lifting the film covering structure 5, and then limit the bypassed protective film 9 by the limiting structure 7;

[0049] S3: Start the driving structure 3 to start the winding roller 211 and the unwinding roller 203, and then wind up the packaging bag 8. At the same time, start the driving component on the laminating structure 5, and then cooperate with the unwinding structure 2 to laminar the packaging bag 8. The laminated packaging bag 8 is rolled up on the winding roller 211.

[0050] When the present invention is in use, the unwinding roller 203 wrapped with the food packaging bag 8 is installed on the two first bearing seats 201 of the frame 1 to ensure that the first rotating shaft 202 rotates smoothly, and the winding roller 211 is installed on the two fourth bearing seats 209 to enable the third rotating shaft 210 to rotate freely. On the film coating structure 5, the film roller 503 wrapped with the protective film 9 is installed on the two sixth bearing seats 502. Then, the second hydraulic rod 602 of the composite structure 6 is started to drive the connecting bar 603, the lifting frame 605 and the guide shaft 606 to rise and fall. After adjusting the height according to actual needs, the protective film 9 is passed around the guide rod 507, the side wall of the pressure roller 508 and the guide shaft 606, and finally around the bottom end of the pressure roller 508. The setting of the guide column 604 improves the stability of the lifting and lowering of the guide shaft 606.

[0051] When the protective film 9 needs to be attached to the packaging bag 8, the first hydraulic rod 504 of the film covering structure 5 is started to push the mounting frame 505 down, so that the guide shaft 606 and the pressure roller 508 are pressed down to make the protective film 9 attached to the packaging bag 8. At the same time, the third hydraulic rod 702 of the limiting structure 7 is started, and its telescopic end pushes the push seat 703, and the limiting seat 705 is driven to move through the connecting rod 704, so that the limiting wheel 706 contacts the protective film 9, and the spring 707 plays a role in buffering and stabilizing the limit.

[0052] When it is necessary to coat the packaging bag 8, the belt is installed on the first pulley 302, the second pulley 303 and the adjusting wheel 305 of the driving structure 3, and the rotating rod 403 on the screw 402 is rotated. The rotating rod 403 drives the screw 402 to rotate. The screw 402 is threadedly connected with the slide seat 304, and the slider 404 on the slide seat 304 slides on the frame 1, so as to adjust the position of the adjusting wheel 305, realize the adjustment of the belt tension, optimize the driving effect of the driving structure 3, turn on the first motor 301 and the second motor 312 of the driving structure 3, and the first motor 301 drives the first pulley 302 to rotate, and the second rotating shaft 205 and the first guide roller 206 are rotated through the belt. At the same time, the first gear 306 on the second rotating shaft 205 drives the second gear 309 to rotate, and the second gear 309 drives the third gear 310 to rotate through the connecting shaft 308, and the third gear 310 is meshed with the fourth gear 311 for transmission, driving the unwinding roller 203 to rotate and unwind, and the second motor 312 drives the fifth gear 313 to rotate and mesh with the sixth gear 314, so that the winding roller 211 rotates and rewinds, and the third motor 509 of the coating structure 5 is started to drive the pressure roller 508 to rotate, and the pressure roller 508 cooperates with the top roller 213 at the bottom to rotate, and cooperates with the unwinding structure 2, so that the protective film 9 is covered on the packaging bag 8 during its movement, and the coated packaging bag 8 is wound on the winding roller 211.

[0053] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A food packaging film laminating and printing device, characterized in that: It comprises a frame (1), an unwinding structure (2) arranged on the frame (1), a driving structure (3) arranged on the frame (1), an adjusting structure (4) arranged on the frame (1), a coating structure (5) arranged on the frame (1), a composite structure (6) arranged on the frame (1), and a limiting structure (7) arranged on the coating structure (5); The frame (1) is fixedly connected with two first bearing seats (201) and a first rotating shaft (202) rotatably connected to the two first bearing seats (201); the first rotating shaft (202) is fixedly connected with an unwinding roller (203); the frame (1) is fixedly connected with two second bearing seats (204); the two second bearing seats (204) are rotatably connected with a second rotating shaft (205); the second rotating shaft (205) is fixedly connected with a first guide roller (206); the frame (1) is fixedly connected with two third bearing seats (207); the two third bearing seats (207) are rotatably connected with a second guide roller (208) , the frame (1) is fixedly connected with two fourth bearing seats (209), the two fourth bearing seats (209) are rotatably connected with a third rotating shaft (210), the third rotating shaft (210) is fixedly connected with a winding roller (211), the frame (1) is fixedly connected with two fifth bearing seats (212), the two fifth bearing seats (212) are rotatably connected with a top roller (213), the unwinding roller (203) is wound with a packaging bag (8), the other end of the packaging bag (8) is wound around the winding roller (211), and the packaging bag (8) passes around the first guide roller (206), the second guide roller (208) and the top roller (213); The composite structure (6) comprises a support plate (601) and a second hydraulic rod (602) fixedly connected to the support plate (601); the support plate (601) is fixedly connected to the frame (1); the second hydraulic rod (602) is fixedly connected to a connecting bar (603); two lifting frames (605) are fixedly connected to the connecting bar (603); the two lifting frames (605) are rotatably connected to guide shafts (606); and the lifting frames (605) are slidably connected to the frame (1).

2. The food packaging film laminating and printing device according to claim 1, characterized in that: Two guide posts (604) are fixedly connected to the connecting strip (603), and the guide posts (604) are slidably connected to the supporting plate (601).

3. The food packaging film laminating and printing device according to claim 1, characterized in that: The driving structure (3) comprises a first motor (301) and a first pulley (302) fixedly connected to the first motor (301); a second pulley (303) is fixedly connected to the second rotating shaft (205); a slide seat (304) is slidably connected to the frame (1); an adjusting wheel (305) is rotatably connected to the slide seat (304); a belt is wound around the first pulley (302), the second pulley (303) and the adjusting wheel (305); and a first gear is fixedly connected to the second rotating shaft (205). (306), a rotating seat (307) is fixedly connected to the frame (1), a connecting shaft (308) is rotatably connected to the rotating seat (307), one end of the connecting shaft (308) is fixedly connected to a second gear (309), the first gear (306) is meshed with the second gear (309), the other end of the connecting shaft (308) is fixedly connected to a third gear (310), the first rotating shaft (202) is fixedly connected to a fourth gear (311), the third gear (310) is meshed with the fourth gear (311).

4. The food packaging film laminating and printing device according to claim 3, characterized in that: The frame (1) is fixedly connected to a second motor (312), the second motor (312) is fixedly connected to a fifth gear (313), the third rotating shaft (210) is fixedly connected to a sixth gear (314), and the fifth gear (313) is meshed with the sixth gear (314).

5. The food packaging film laminating and printing device according to claim 3, characterized in that: The adjustment structure (4) comprises two fixed blocks (401) and a screw rod (402) rotatably connected to the two fixed blocks (401), and the screw rod (402) is threadedly connected to the slide seat (304).

6. The food packaging film laminating and printing device according to claim 5, characterized in that: A slider (404) is fixedly connected to the slide seat (304), and the slider (404) is slidably connected to the frame (1). The end of the screw rod (402) is slidably connected to a rotating rod (403) with an "I"-shaped cross section.

7. The food packaging film laminating and printing device according to claim 1, characterized in that: The coating structure (5) comprises two vertical frames (501) and a sixth bearing seat (502) fixedly connected to the vertical frames (501); the two sixth bearing seats (502) are rotatably connected to film rollers (503); a protective film (9) is wound around the film rollers (503); the vertical frames (501) are fixedly connected to first hydraulic rods (504); the bottom ends of the two first hydraulic rods (504) are fixedly connected to mounting frames (505); two mounting bars (506) are fixedly connected to the mounting frames (505); a guide rod (507) is rotatably connected between the two mounting bars (506); the protective film (9) bypasses the guide rod (507); a pressure roller (508) is rotatably connected to the mounting frames (505); the protective film (9) bypasses the pressure roller (508).

8. The food packaging film laminating and printing device according to claim 7, characterized in that: A third motor (509) is fixedly connected to the mounting frame (505), and an output end of the third motor (509) is fixedly connected to a pressure roller (508).

9. The food packaging film laminating and printing device according to claim 7, characterized in that: The limiting structure (7) comprises a fixed frame (701) and a third hydraulic rod (702) fixedly connected to the fixed frame (701); the mounting frame (505) is fixedly connected to the fixed frame (701); the telescopic end of the third hydraulic rod (702) is fixedly connected to a push seat (703); the push seat (703) is rotatably connected to two connecting rods (704); the connecting rods (704) are rotatably connected to a limiting seat (705); the limiting seat (705) is rotatably connected to a limiting wheel (706); the limiting wheel (706) contacts the protective film (9); and a spring (707) is fixedly connected between the limiting seat (705) and the fixed frame (701).

10. The method for using the food packaging film laminating and printing device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: When it is necessary to cover the food packaging bag (8) with the protective film (9), the unwinding roller (203) and the rewinding roller (211) for retracting the packaging bag (8) can be first installed on the corresponding bearing seats on the frame (1), and then the protective film (9) can be installed on the film coating structure (5), the height of the composite structure (6) can be adjusted, and then the protective film (9) can be passed around the composite structure (6); S2: installing the belt on the driving structure (3), adjusting the tension of the belt by means of the adjusting structure (4), thereby adjusting the driving effect of the driving structure (3), making the protective film (9) fit the packaging bag (8) by means of the lifting and lowering film covering structure (5), and then limiting the bypassed protective film (9) by means of the limiting structure (7); S3: Start the driving structure (3) to start the winding roller (211) and the unwinding roller (203), thereby winding the packaging bag (8), and at the same time start the driving component on the laminating structure (5), thereby cooperating with the unwinding structure (2) to perform a laminating operation on the packaging bag (8), and the laminated packaging bag (8) is rolled up on the winding roller (211).

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