A coating device for laminating film layers in packaging bags

Abstract

This utility model relates to the technical field of packaging bag processing equipment, and in particular to a gluing device for laminating packaging bag film layers. It includes a frame, a feed roller mounted on the frame for conveying packaging film, and multiple sets of guide rollers rotatably connected to the inner wall of the frame. A gluing roller is positioned between the feed roller and the guide rollers. An auxiliary rod is positioned above and in front of the gluing roller, parallel to the gluing roller, and its two ends are fixedly connected to the frame. At least two sets of limiting components are provided on the auxiliary rod, spaced apart. A glue spraying component is also provided on the frame for spraying glue onto the gluing roller. The glue spraying component is perpendicular to the gluing roller and is connected in conjunction with the limiting components. This utility model effectively solves the problems of glue overflow, uneven gluing, and difficulty in controlling the gluing width in the prior art, thereby ensuring the stability and consistency of adhesion during subsequent packaging film layer lamination.

Description

Technical Field

[0001] This utility model relates to the field of packaging bag processing equipment technology, and in particular to a coating device for packaging bag film layer lamination. Background Technology

[0002] Food packaging bags are a type of packaging design. In order to facilitate the preservation and storage of food, product packaging bags have been developed. Food packaging bags refer to thin film containers that come into direct contact with food and are used to hold and protect food. In the process of mass production of food packaging bags, multiple film layers are laminated together. By utilizing the characteristics of different film layers, the packaging bags are given properties such as easy printing, heat sealing, and light blocking, thus meeting the packaging needs of various items.

[0003] Existing adhesive coating devices mostly utilize adhesive coating rollers for dipping adhesive. For example, patent CN 219356709U discloses an adhesive coating device for processing composite packaging bags. This device primarily involves placing adhesive in a glue pool at the bottom of the adhesive roller, immersing the bottom part of the roller in the adhesive, and then driving the roller to rotate via a drive device. This causes a take-up roller to press down on the packaging film being conveyed by the feed roller and conveyor roller, tightening the film and applying adhesive to the surface of the packaging bag film. However, during the adhesive coating process, because the width of the adhesive coating roller is greater than the width of the packaging bag film, adhesive on the roller surface easily overflows to the back edge of the packaging bag film. Furthermore, the coating width is difficult to control, leading to uneven coating and contamination of the equipment and the film. Utility Model Content

[0004] In order to address the technical deficiencies mentioned in the background art, the purpose of this utility model is to provide a coating device for packaging bag film layer lamination, which aims to solve the problems of glue overflow, uneven coating, and difficulty in controlling the coating width in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A coating device for laminating packaging film includes a frame, a feed roller mounted on the frame for conveying packaging film, and multiple sets of guide rollers rotatably connected between the inner walls of the frame. A coating roller is disposed between the feed roller and the guide rollers. An auxiliary rod is disposed above the front side of the coating roller, parallel to the coating roller, and both ends of the auxiliary rod are fixedly connected to the frame. At least two sets of limiting components are disposed on the auxiliary rod, with the two sets of limiting components spaced apart on the auxiliary rod. The frame is also equipped with a glue spraying component for spraying glue onto the coating roller. The glue spraying component is arranged perpendicular to the coating roller and is connected to a limiting component to automatically adjust the range of glue spraying on the coating roller according to the width of the packaging film.

[0006] Preferably, the glue spraying assembly includes a glue storage tank, a glue guide tube, and a glue spraying gun. One end of the glue spraying gun extends to the outer surface of the glue coating roller, and the other end is connected to the glue storage tank through the glue guide tube. The glue spraying gun is equipped with an electrically controlled valve for controlling the glue flow rate. A check valve to prevent glue backflow is provided at the end of the glue guide tube near the glue storage tank. The check valve is connected to the electrically controlled valve through a cooperation.

[0007] Preferably, the glue gun has a nozzle detachably connected to one end from which the glue is dispensed, and the nozzle is flat or conical.

[0008] Preferably, the limiting component includes a mounting block sleeved on the auxiliary rod, a locking member for fixing the position of the mounting block, and a limiting protrusion for marking the width of the packaging film. The mounting block has a through hole adapted to the auxiliary rod, and the auxiliary rod passes through the through hole. One end of the locking member is threaded into the mounting block and abuts against the auxiliary rod. The limiting protrusion is fixed to the top of the mounting block, and a pull rope is wound around the limiting protrusion.

[0009] Preferably, the bottom of the glue spraying assembly is provided with a longitudinal moving mechanism for driving the glue spraying gun to move in the direction of the glue coating roller, and the bottom of the longitudinal moving mechanism is slidably connected with a transverse moving mechanism for driving the glue spraying gun to move in the parallel direction of the glue coating roller. The bottom of the transverse moving mechanism is provided with a support frame, and one side of the support frame is fixedly connected to the frame.

[0010] Preferably, the longitudinal moving mechanism includes a cylinder, a guide seat, and a connecting plate. The bottom of the connecting plate is fixedly connected to the transverse moving mechanism. The guide seat and the cylinder are fixed on the connecting plate, and the guide seat is fixedly connected to the glue gun. The output end of the cylinder is drivenly connected to the guide seat to drive the guide seat to move the glue gun back and forth.

[0011] Preferably, the lateral movement mechanism includes a bearing slide rail seat, a ball screw assembly installed in the bearing slide rail seat, a nut seat slidably connected to the ball screw assembly, and a servo motor; the ball screw assembly is mounted on a support frame along a length direction parallel to the glue-applying roller, and both ends of the ball screw assembly are connected to the bearing slide rail seat; the nut seat is threadedly engaged with the ball screw assembly, and the top end of the nut seat is fixedly connected to the longitudinal movement mechanism; the output shaft of the servo motor is drively connected to one end of the ball screw assembly.

[0012] Preferably, the frame is further provided with a glue receiving tray located below the glue coating roller, guide roller and auxiliary rod. The glue receiving tray is used to collect glue that falls from the glue coating roller, and the glue receiving tray is detachably connected to the inner wall of the frame.

[0013] In summary, the beneficial effects of this utility model are as follows: This invention relates to a glue-applying device that directly sprays glue onto the surface of a glue-applying roller using a glue-spraying assembly. When dealing with packaging films of different widths, the spraying range on the glue-applying roller is adjusted by changing the distance between two sets of limiting components. This avoids the problem of uncontrolled glue width in traditional dipping methods and effectively prevents glue from overflowing to the back edge of the film due to excessive spraying. This reduces contamination of the equipment and film, lowers the film scrap rate caused by contamination, avoids waste of excess glue, and saves on raw material costs. Furthermore, it ensures the stability and consistency of adhesion during subsequent packaging film lamination, significantly improving the product quality of packaged bag film lamination. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the adhesive coating device for packaging bag film layer lamination according to the present invention; Figure 2 yes Figure 1 Enlarged view of the limiting component structure at point a; Figure 3 This is a top view of the adhesive coating device for packaging bag film layer lamination according to the present invention; Figure 4 This is a front view of the adhesive coating device for packaging bag film layer lamination according to this utility model; Figure 5 yes Figure 4 A cross-sectional view of the AA plane; Figure 6 This is a schematic diagram of the structure of the frame and its internal roller assembly in this utility model; Figure 7 This is a schematic diagram of the adhesive spraying assembly in this utility model.

[0015] Explanation of the reference numerals in the figure: 1. Frame; 11. Feeding roller; 12. Guide roller; 13. Glue coating roller; 2. Auxiliary rod; 3. Limiting assembly; 31. Mounting block; 32. Locking component; 33. Infrared sensor; 4. Glue spraying assembly; 41. Glue storage tank; 42. Glue guide tube; 43. Glue spraying gun; 431. Nozzle; 5. Electrically controlled valve; 6. Check valve; 7. Longitudinal movement mechanism; 71. Cylinder; 72. Guide seat; 73. Connecting plate; 8. Lateral movement mechanism; 81. Bearing slide rail seat; 82. Ball screw pair; 83. Nut seat; 84. Servo motor; 9. Support frame; 91. Limit switch; 92. Slide rail; 10. Glue receiving tray. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0017] Those skilled in the art should understand that, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying 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, the above terms should not be construed as limitations on this utility model.

[0018] In the description of this utility model, the use of terms such as "several" means one or more, with "multiple" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the quantity of indicated technical features, or the sequential relationship between indicated technical features.

[0019] The following is in conjunction with the appendix Figure 1-7 The present invention provides a more detailed description of an embodiment of a coating device for laminating film layers in packaging bags.

[0020] A coating device for laminating film layers in packaging bags, such as Figure 1 , 2 As shown, the device includes a frame 1, a feed roller 11 mounted on the frame 1 for conveying packaging film, and multiple sets of guide rollers 12 rotatably connected between the inner walls of the frame 1. A coating roller 13 is provided between the feed roller 11 and the guide rollers 12. An auxiliary rod 2 is provided above the front side of the coating roller 13. The auxiliary rod 2 is parallel to the coating roller 13, and both ends of the auxiliary rod 2 are fixedly connected to the frame 1. At least two sets of limiting components 3 are provided on the auxiliary rod 2, and the two sets of limiting components 3 are distributed at intervals on the auxiliary rod 2.

[0021] Specifically, the feed roller 11 is used to hold the packaging film roll to be coated with adhesive. Rotation of the feed roller unwinds the film. Both ends of the feed roller 11 are rotatably connected to the frame 1 via bearings to ensure smooth unwinding. The guide roller 12 guides and tensions the packaging film fed by the feed roller 11, ensuring the film remains flat and stable as it passes through the coating roller 13. Both ends of each guide roller 12 are connected to the frame 1 via bearings. The coating roller 13 is positioned between the feed roller 11 and the guide roller 12 and is rotatably connected to the frame 1. The coating roller 13 receives the adhesive sprayed by the adhesive spraying assembly 4 and evenly transfers the adhesive to the surface of the packaging film. The surface of the coating roller 13 is polished to ensure uniform adhesive coating.

[0022] It should be noted that the layout of the feeding roller 11, guide roller 12 and coating roller 13 in the frame 1 in this embodiment is the same as that in the packaging film roll laminating machine in the prior art. Their connection method and working principle can be referred to existing common knowledge, so they will not be described in detail in this embodiment.

[0023] In this embodiment, the limiting component 3 includes a mounting block 31 sleeved on the auxiliary rod 2, a locking member 32 for fixing the position of the mounting block 31, and a limiting protrusion 33 for marking the width of the packaging film. The mounting block 31 has a through hole adapted to the auxiliary rod 2, and the auxiliary rod 2 passes through the through hole. The locking member 32 is threadedly connected to the mounting block, and one end of the locking member 32 abuts against the auxiliary rod 2. The limiting protrusion 33 is fixed to the top of the mounting block 31, and a pull rope (not shown in the figure) is wrapped around the limiting protrusion 31.

[0024] Specifically, the mounting block 31 is a rectangular block structure with a through hole in the center that precisely matches the diameter of the auxiliary rod 2, allowing the mounting block 31 to slide smoothly along the auxiliary rod 2 with minimal resistance when adjusting its position. The locking component 32 includes a screw and a knob. The side wall of the mounting block 31 has a threaded hole communicating with the through hole. The screw is threaded into this hole, and one end of the screw can extend into the through hole and press against the outer surface of the auxiliary rod 2. The other end is fixed to the knob. By rotating the knob, the screw can be moved forward or backward, thus fixing or loosening the mounting block 31. During installation and debugging, depending on the width of the packaging film to be processed, first loosen the locking component 32, slide the two sets of mounting blocks 31 along the auxiliary rod 2 so that the limiting protrusions 33 correspond to the two side edges of the packaging film; then tighten the knob, and the front end of the screw presses against the auxiliary rod 2, using friction to fix the position of the mounting block 31, thereby initially marking the width of the packaging film.

[0025] In this embodiment, the frame 1 is also provided with a glue spraying component 4 for spraying glue onto the glue coating roller 13. The glue spraying component 4 is arranged perpendicular to the glue coating roller 13, and the glue spraying component 4 is connected to the limiting component 3 to automatically adjust the range of the glue spraying component 4 on the glue coating roller 13 according to the width of the packaging film.

[0026] Specifically, the glue spraying assembly 4 includes a glue storage tank 41, a glue guide tube 42, and a glue spraying gun 43. One end of the glue spraying gun 43 extends to the outer surface of the glue coating roller 13, and the other end is connected to the glue storage tank 41 through the glue guide tube 42. The glue spraying gun 43 is equipped with an electronically controlled valve 5 for controlling the glue flow rate. A check valve 6 is provided at the end of the glue guide tube 42 near the glue storage tank 41 to prevent glue backflow. The check valve 6 and the electronically controlled valve 5 are connected by a cooperation.

[0027] The glue storage tank 41 is a sealed container used to store the glue to be sprayed. It has a glue outlet at the top, which can be connected to an external glue pump (not shown in the figure) to provide power for glue delivery. The glue guide tube 42 is made of corrosion-resistant silicone tubing, possessing good flexibility and chemical resistance. One end of the glue guide tube 42 connects to the glue outlet of the glue storage tank 41, and the other end connects to the glue inlet of the glue gun 43, achieving a closed-loop glue delivery. The glue gun 43 has a spray gun structure with smooth internal flow channels to reduce glue flow resistance. One end of the glue gun 43 is the glue outlet, extending to the outer surface of the coating roller 13 and maintaining a suitable distance from the coating roller 13; the other end is the glue inlet, connected to the glue guide tube 42 via a quick-connect coupling. The electrically controlled valve 5 is integrated into the glue inlet channel of the glue gun 43 or the glue guide tube 42, controlling the opening and closing degree of the valve core via an electrical signal, thereby precisely adjusting the glue flow rate. The check valve 6 is a one-way valve with an internal elastic valve core. It is installed on the glue guide tube 42 near the glue storage tank 41 and only allows glue to flow from the glue storage tank 41 to the glue spray gun 43. When the glue spraying stops, the valve core closes under the action of spring force or glue back pressure to prevent glue backflow.

[0028] The glue spraying process is as follows: the glue in the glue storage tank 41 flows to the glue spray gun 43 through the glue guide tube 42 under the power of the glue pump; the electric control valve 5 controls the glue flow rate by adjusting the opening and closing degree of the valve core, so that the glue spray gun 43 matches the flow rate of the packaging film width and the glue coating thickness, and sprays the glue onto the surface of the glue coating roller 13 in a fan shape or column shape; the check valve 6 is kept open due to the positive pressure during glue spraying, and the valve core automatically closes when glue spraying stops, to prevent the glue from flowing back to the glue storage tank 41 due to the pressure difference in the pipeline, and to ensure that the glue can flow out quickly and smoothly when glue is sprayed next time; thus, it can be flexibly adjusted according to the process requirements of the packaging film width and the glue coating thickness, ensuring the uniformity of glue coating from the source and avoiding excessive or insufficient glue in some areas.

[0029] In this embodiment, as Figure 2 As shown, the glue gun 43 has a nozzle 431 detachably connected to one end from which the glue is dispensed. The nozzle 431 is flat or conical.

[0030] Specifically, the glue gun 43 can select a suitable nozzle 431 according to the glue coating process requirements. When a wide and uniform glue coating is required for the packaging film, a flat nozzle 431 is selected. After the glue is sprayed out through the narrow slit, a wide and thin uniform glue layer is formed on the surface of the glue coating roller 13, ensuring uniform overall adhesion during subsequent film layer lamination. When it is necessary to apply glue to a local area of ​​the packaging film or to apply glue in fine lines, a conical nozzle 431 can be selected. After the glue is sprayed out through the narrow nozzle, a concentrated glue flow or fine glue line is formed, accurately covering the target area. The flat and conical nozzles 431 are suitable for different application scenarios, thereby enhancing the versatility of the equipment.

[0031] The nozzle 431 and the glue gun 43 are detachable via a threaded connection or a snap-fit ​​connection. If threaded, the outer surface of the nozzle 431 has external threads, and the inner surface of the glue gun 43's dispensing end has matching internal threads; installation or removal is achieved by rotation. If snap-fit, the outer side of the nozzle 431 has an annular locking protrusion, and the inner side of the glue gun 43's dispensing end has a corresponding locking groove; installation and removal are achieved by engaging or disengaging. After use, the nozzle 431 can be quickly unscrewed or removed to clean residual glue with solvent, or a new nozzle 431 can be directly replaced to meet the glue application needs of different batches of products.

[0032] In this embodiment, as Figure 1 As shown, the bottom of the glue spraying assembly 4 is provided with a longitudinal moving mechanism 7 for driving the glue spraying gun 43 to move in the direction of the glue coating roller 13. The bottom of the longitudinal moving mechanism 7 is slidably connected with a transverse moving mechanism 8 for driving the glue spraying gun 43 to move in the parallel direction of the glue coating roller 13. The bottom of the transverse moving mechanism 8 is provided with a support frame 9, and one side of the support frame 9 is fixedly connected to the frame 1.

[0033] Specifically, the longitudinal moving mechanism 7 includes a cylinder 71, a guide seat 72, and a connecting plate 73. The bottom of the connecting plate 73 is fixedly connected to the transverse moving mechanism 8. The guide seat 72 and the cylinder 71 are fixed on the connecting plate 73, and the guide seat 72 is fixedly connected to the glue gun 43. The output end of the cylinder 71 is connected to the guide seat 72 to drive the guide seat 72 to move the glue gun 43 back and forth. When it is necessary to adjust the distance between the glue gun 43 and the coating roller 13, air is supplied to the cylinder 71 through the pneumatic control system. The cylinder 71 pushes the guide seat 72 to move in a direction perpendicular to the axis of the coating roller 13, thereby driving the glue gun 43 closer to the coating roller 13, ensuring that the glue can be accurately sprayed on the effective area of ​​the roller surface. If it is necessary to avoid the glue gun 43 from directly contacting the coating roller 13 and causing wear, the guide seat 72 can be pulled by the cylinder 71 to keep the glue gun 43 at a suitable distance, ensuring the spraying effect while protecting the equipment. The longitudinal moving mechanism 7 drives the adjustment of the front and rear position of the glue gun 43, so that it can adapt to the diameter changes of different glue coating rollers 13 or the requirements of the spraying process, thereby ensuring the atomization effect or coating uniformity.

[0034] In this embodiment, the lateral movement mechanism 8 includes a bearing slide rail seat 81, a ball screw assembly 82 installed in the bearing slide rail seat 81, a nut seat 83 slidably connected to the ball screw assembly 82, and a servo motor 84; the ball screw assembly 82 is mounted on the support frame 9 along the length direction parallel to the glue roller 13, and both ends of the ball screw assembly 82 are connected to the bearing slide rail seat 81; the nut seat 83 is threadedly engaged with the ball screw assembly 82, and the top end of the nut seat 83 is fixedly connected to the longitudinal movement mechanism 7; the output shaft of the servo motor 84 is drivenly connected to one end of the ball screw assembly 82.

[0035] Specifically, after the servo motor 84 receives the electrical signal transmitted by the limit protrusion 33, it rotates according to a preset program and drives the ball screw assembly 82 to rotate through the coupling. When the ball screw assembly 82 rotates, the nut seat 83 moves linearly in a direction parallel to the glue coating roller 13, thereby driving the longitudinal moving mechanism 7 and the glue spraying assembly 4 to move laterally synchronously to ensure that the spraying range of the glue spraying gun 43 is precisely consistent with the width of the packaging film. For example, when the width of the packaging film is 300mm, the servo motor 84 drives the ball screw assembly 82 to rotate a specific number of revolutions, causing the nut seat 83 to move a distance corresponding to 300mm, ensuring that the spraying coverage of the glue spraying gun 43 exactly matches the width of the packaging film. Among them, the lateral moving mechanism 8 adopts the screw drive in the prior art, and its specific structural composition and working principle are the same as those of the screw drive. Therefore, its structure and principle will not be described in detail in this embodiment.

[0036] It should be noted that, as Figure 3 and Figure 5 As shown, in order to ensure that the travel of the lateral moving mechanism 8 is compatible with the actual width of the packaging film, a limit switch 91 is provided on the support frame 9 to cooperate with the limiting protrusion 33. There are two limit switches 91, and a slide rail 92 is provided at the bottom of the limit switch 91. The slide rail 92 is located in front of the lateral moving mechanism 8 and is parallel to it. The limit switch 91 is adjusted by sliding along the slide rail 92 with a slider at the bottom to make it correspond to the position of the limiting protrusion 33. At the same time, the limit switch 91 is electrically connected to the lateral moving mechanism 8, so that the sliding travel of the lateral moving mechanism 8 is between the two limit switches, thereby ensuring that the glue spraying range matches the width of the packaging film.

[0037] The bottom of the limit switch 91 housing integrates a locking assembly, which is identical to the locking component 32. This assembly includes a locking bolt and an adjusting knob. The locking bolt vertically penetrates the slider at the bottom of the limit switch 91, and its top is fixedly connected to the adjusting knob. An anti-slip pad is fitted onto its bottom end. When the limit switch 91 slides along the slide rail 92 until it is aligned with the limit protrusion 33 via a pull rope, rotating the adjusting knob clockwise moves the locking bolt downwards, causing the anti-slip pad to tightly adhere to the surface of the slide rail 92. The axial pressure of the locking bolt and the friction of the anti-slip pad firmly lock the limit switch 91 onto the slide rail 92, preventing displacement due to vibration during equipment operation. To change to a different width of packaging film, simply rotate the adjusting knob counterclockwise to loosen the locking bolt, allowing the limit switch 91 to readjust its position along the slide rail 92. This operation is convenient and the positioning accuracy is controllable.

[0038] It is worth noting that, in order to further ensure the positional accuracy of the limit switch 91 and the limit protrusion 33, in addition to the straightening of the pull rope for positioning, the side edge of the slide rail 92 is also marked with length scale lines, and the side of the housing of the limit switch 91 is provided with a pointer mark. The pointer points to the length scale line, and the current position coordinates of the limit switch 91 can be read intuitively. At the same time, the top of the limit protrusion 33 is also provided with a positioning reference line. During adjustment, the distance between the limit switches 91 on both sides and the distance between the limit protrusion 33 can be ensured by combining the scale reading with the reference line alignment. This avoids positioning deviation caused by the elastic deformation of the pull rope and provides a precise reference for the stroke control of the subsequent lateral movement mechanism 8.

[0039] In this embodiment, the lateral moving mechanism 8 is also provided with a travel triggering protrusion that cooperates with the limit switch 91. The travel triggering protrusion is an L-shaped metal block, which is fixed to the side of the nut seat 83 near the limit switch 91 by welding or bolting. The height of the travel triggering protrusion is adapted to the height of the trigger contact of the limit switch 91, and the width of the travel triggering protrusion is greater than the diameter of the trigger contact of the limit switch, so as to avoid trigger failure due to slight vibration of the lateral moving mechanism 8.

[0040] Specifically, when the lateral movement mechanism 8 is started, the servo motor 84 drives the ball screw pair 82 to rotate, the nut seat 83 moves along the screw axis, and the stroke triggering protrusion moves synchronously with the nut seat 83. If the glue spraying assembly 4 needs to move towards the left edge of the packaging film, the nut seat 82 drives the triggering protrusion to move to the left. When the stroke triggering protrusion contacts the trigger contact of the left limit switch 91, the micro switch inside the left limit switch 91 is activated, sending a signal and transmitting it to the external control system. After receiving the signal, the external control system immediately controls the servo motor to stop rotating to prevent the glue spraying assembly 4 from continuing to move to the left beyond the left edge of the packaging film, and at the same time prepares the signal for subsequent movement to the right.

[0041] When the glue spraying assembly 4 needs to move towards the right edge of the packaging film, the external control system controls the servo motor 84 to rotate in the opposite direction. The nut seat 83 drives the stroke trigger protrusion to move to the right. When the stroke trigger protrusion contacts the trigger contact of the right limit switch 91, the right limit switch 91 sends a signal and transmits it to the external control system. After receiving the signal, the external control system controls the servo motor to stop again, thus completing one cycle of lateral movement from the left limit to the right limit. This ensures that the spraying range of the glue gun 43 precisely covers the width of the packaging film, i.e., the distance between the two limit switches 91, thereby avoiding the problem of glue overflowing to the back edge of the film due to excessively wide spraying and causing contamination. When changing to a packaging film of a different width, simply repeat the above steps to ensure that the sliding stroke of the lateral movement mechanism 8 always matches the width of the packaging film.

[0042] In this embodiment, during the glue application process, any glue not completely transferred to the packaging film on the glue application roller 13 or a small amount of glue spilled during spraying by the glue spraying assembly 4 will fall from the glue application roller 13, guide roller 12, and other components under gravity. Since glue can easily contaminate the equipment, a glue collection tray 10 is provided below the glue application roller 13, guide roller 12, and auxiliary rod 2. The glue collection tray 10 is used to collect the glue that falls from the glue application roller 13, and it is detachably connected to the inner wall of the frame 1. By providing the glue collection tray 10, glue can be prevented from directly dripping onto the frame 1, the ground, or other equipment components.

[0043] Specifically, the glue receiving tray 10 is an open disc-shaped structure, with a size larger than the length of the glue application roller 13 and the distribution range of the guide roller 12, ensuring that it can catch all the fallen glue. A slot or mounting lug is provided on the inner wall of the frame 1 at the position corresponding to the glue receiving tray 10. The glue receiving tray 10 is connected to the frame 1 by snapping into the slot or bolting to the mounting lug. When the glue in the glue receiving tray 10 accumulates to a certain amount, the operator only needs to pull out or unscrew the bolt to remove the glue receiving tray 10 from the frame 1, which is convenient for centralized cleaning of the glue.

[0044] The working principle of this utility model: When performing composite adhesive coating on the packaging film, preliminary preparations must be completed in accordance with the width of the packaging film to be processed and the adhesive coating process requirements. First, slide the mounting block 31 of the limiting component 3 along the auxiliary rod 2 so that the limiting protrusion 33 is aligned with the two sides of the packaging film. Then, fix the position of the mounting block 31 by the locking component 32. Then, push the guide seat 72 through the longitudinal moving mechanism 7 to drive the glue spray gun 43 to move in the front and back direction and adjust it to the appropriate distance between the glue spray gun 43 and the adhesive coating roller 13. Finally, adjust the position of the limit switch 91 so that the sliding stroke of the transverse moving mechanism 8 matches the width of the packaging film. When the gluing operation begins, the feed roller 11 releases the packaging film, which is then guided and tensioned by multiple sets of guide rollers 12 and smoothly conveyed to the gluing roller 13. The glue in the glue storage tank 41 flows to the electric control valve 5 through the glue guide tube 42. The electric control valve 5 precisely adjusts the opening and closing degree of the valve core to control the glue flow rate. The glue is finally sprayed onto the surface of the gluing roller 13 through the nozzle 431 of the glue spray gun 43. At the same time, the control of the lateral movement mechanism 8 drives the longitudinal movement mechanism 7 and the glue spraying assembly 4 to move left and right, thereby ensuring that the spraying width of the glue spray gun 43 is completely consistent with the width of the packaging film. During the rotation of the gluing roller 13, under the combined action of the upper guide roller 12, the surface glue layer is evenly transferred to the surface of the packaging film. The glued packaging film continues to be conveyed to the subsequent lamination process by the guide roller 12.

[0045] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A coating apparatus for laminating packaging bag film layers, comprising a frame, a feed roller mounted on the frame for conveying packaging film, and multiple sets of guide rollers rotatably connected between the inner walls of the frame, characterized in that, A coating roller is provided between the feed roller and the guide roller. An auxiliary rod is provided above the front side of the coating roller. The auxiliary rod is parallel to the coating roller and its two ends are fixedly connected to the frame. At least two sets of limiting components are provided on the auxiliary rod, and the two sets of limiting components are distributed at intervals on the auxiliary rod. The frame is also equipped with a glue spraying component for spraying glue onto the coating roller. The glue spraying component is arranged perpendicular to the coating roller and is connected to a limiting component to automatically adjust the range of glue spraying on the coating roller according to the width of the packaging film.

2. The adhesive coating device for packaging bag film layer lamination according to claim 1, characterized in that, The glue spraying assembly includes a glue storage tank, a glue guide tube, and a glue spraying gun. One end of the glue spraying gun extends to the outer surface of the glue coating roller, and the other end is connected to the glue storage tank through the glue guide tube. The glue spraying gun is equipped with an electrically controlled valve for controlling the glue flow rate. A check valve to prevent glue backflow is provided at the end of the glue guide tube near the glue storage tank. The check valve is connected to the electrically controlled valve through a cooperation.

3. The adhesive coating device for packaging bag film layer lamination according to claim 2, characterized in that, The glue gun has a nozzle detachably connected to one end from which the glue is dispensed. The nozzle is either flat or conical.

4. The adhesive coating device for packaging bag film layer lamination according to claim 1, characterized in that, The limiting component includes a mounting block sleeved on an auxiliary rod, a locking member for fixing the position of the mounting block, and a limiting protrusion for marking the width of the packaging film. The mounting block has a through hole adapted to the auxiliary rod, and the auxiliary rod passes through the through hole. One end of the locking member is threaded into the mounting block and abuts against the auxiliary rod. The limiting protrusion is fixed to the top of the mounting block, and a pull rope is wrapped around the limiting protrusion.

5. The adhesive coating device for packaging bag film layer lamination according to claim 2, characterized in that, The bottom of the glue spraying assembly is provided with a longitudinal moving mechanism for driving the glue spraying gun to move in the direction of the glue coating roller. The bottom of the longitudinal moving mechanism is slidably connected to a transverse moving mechanism for driving the glue spraying gun to move in the parallel direction of the glue coating roller. The bottom of the transverse moving mechanism is provided with a support frame, and one side of the support frame is fixedly connected to the frame.

6. The adhesive coating apparatus for packaging bag film layer lamination according to claim 5, characterized in that, The longitudinal moving mechanism includes a cylinder, a guide seat, and a connecting plate. The bottom of the connecting plate is fixedly connected to the transverse moving mechanism. The guide seat and the cylinder are fixed on the connecting plate, and the guide seat is fixedly connected to the glue gun. The output end of the cylinder is connected to the guide seat for transmission, so as to drive the guide seat to move the glue gun back and forth.

7. The adhesive coating apparatus for packaging bag film layer lamination according to claim 5, characterized in that, The lateral movement mechanism includes a bearing slide rail seat, a ball screw assembly installed in the bearing slide rail seat, a nut seat slidably connected to the ball screw assembly, and a servo motor; the ball screw assembly is mounted on a support frame along the length direction parallel to the glue roller, and both ends of the ball screw assembly are connected to the bearing slide rail seat; the nut seat is threadedly engaged with the ball screw assembly, and the top end of the nut seat is fixedly connected to the longitudinal movement mechanism; the output shaft of the servo motor is drivenly connected to one end of the ball screw assembly.

8. The adhesive coating apparatus for laminating packaging bag film layers according to claim 1, characterized in that, The frame is also equipped with a glue receiving tray located below the glue coating roller, guide roller and auxiliary rod. The glue receiving tray is used to collect glue that falls from the glue coating roller, and the glue receiving tray is detachably connected to the inner wall of the frame.

Images