Hot-pressing composite production line for sealed packaging bags

Abstract

The invention relates to the field of packaging bag production, and discloses a sealed packaging bag hot-pressing composite production line which comprises a rack platform. The box body is arranged at the top of the rack platform, and a feeding pipe is arranged in the box body; according to the packaging bag laser marking device, a linkage structure of the intercepting plate and the pressure applying plate is arranged, active flattening and bulging treatment before packaging bag laser marking is achieved, the problems that in the sealing and conveying process of an existing heat-sealing packaging bag, surface wrinkles, collapse, bulging and the like are prone to occurring are effectively solved, the flatness and stability of a marking area are remarkably improved, and the packaging bag laser marking device is suitable for large-scale popularization and application. And an ideal reference surface is provided for laser beam focusing. Compared with a traditional method depending on vacuumizing or manual smoothing, the method has the advantages that no additional process link needs to be added, redistribution of gas in the bag body can be completed only through mechanical compression, the surface of the packaging bag is naturally expanded, the whole packaging bag is tensioned, and good machining adaptability and equipment compatibility are shown.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging bag production, in particular to a hot-pressing composite production line for sealed packaging bags. Background Art

[0002] With the advancement of packaging automation, the production of sealed packaging bags is gradually evolving towards high-speed, continuous, and intelligent production. In many application scenarios, such as food packaging, daily chemical products, and pharmaceutical products, hot-pressed flexible packaging bags are used to meet product requirements for sealing, moisture resistance, anti-counterfeiting, and traceability.

[0003] Currently, the most mature heat-sealing solutions for packaging bags are based on multi-station rotary designs. These production lines typically include multiple rotating stations, each controlled by a rotary drive system, sequentially completing key processing steps such as bag opening, quantitative feeding, and heat-press sealing. This structure offers advantages such as stable cycle times, compact footprint, and labor savings, making it suitable for continuous and efficient bag-making and packaging operations.

[0004] To meet modern packaging traceability and anti-counterfeiting requirements, sealed packaging bags often require laser coding after sealing to include production date, QR code, batch number, or traceability information. Laser coding, a non-contact, high-contrast marking method, offers advantages such as speed, clarity, and indelibility, making it widely used in the final processing of packaging.

[0005] However, existing production lines move directly to the laser coding unit after completing the heat-sealing process. Because the bags have just undergone heat pressing and conveying, their surfaces often wrinkle, crease, or partially collapse, making it difficult for the laser beam to focus during scanning, thus affecting coding accuracy and recognition clarity. This is especially true for large-area QR codes or barcodes, where uneven surfaces can easily lead to missing information or scan failures. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a hot-pressing composite production line for sealed packaging bags, aiming to alleviate the above-mentioned problems at least to a certain extent.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: A hot pressing and laminating production line for sealed packaging bags, comprising: Rack platform; A box body is provided on the top of the frame platform, wherein a feed pipe is provided in the box body; A forming tube provided in the box body is connected to the feed tube, and its bottom passes through the frame platform and extends into the interior thereof; A hot pressing device provided in the frame platform is used for conveying and sealing packaging bags; A conveying device provided inside the frame platform, located at the bottom of the hot pressing device, for conveying the sealed packaging bags; A laser marking device provided on one side of the hot pressing device is used to emit a laser beam to the packaging bag to mark fonts on the packaging bag; An interception plate is provided on one side of the laser marking device, and a pressure plate is provided on the side of the interception plate close to the laser marking device; The expansion component provided between the hot pressing device and the intercepting plate is used to move the intercepting plate and the pressure plate so that the pressure plate presses the packaging bag. The expansion component can move the intercepting plate and the pressure plate when the hot pressing device seals the packaging bag.

[0008] Preferably, the conveying device includes a conveying platform connected to the inner bottom surface of the frame platform, a plurality of conveying rollers are connected to the conveying platform, a conveyor belt is commonly provided on the plurality of conveying rollers, a motor a is connected to the conveying platform, and the drive shaft of the motor a is connected to one of the conveying rollers.

[0009] Preferably, the outer wall of the forming tube is provided with a plurality of forming rings, the inner diameter of the forming ring is larger than the outer diameter of the forming tube, a forming channel is provided between the forming ring and the forming tube, a side opening is provided on one side of the forming ring, and a connecting rod is connected between the plurality of forming tubes, and the connecting rod is fixedly connected to the forming tube.

[0010] Preferably, the hot pressing device includes a support frame connected to the frame platform, two heat sealing frames a are slidably connected to the support frame, heating strips a are respectively connected to the two sides of the two heat sealing frames a close to each other, a cylinder a is connected to the support frame, and its drive shaft is connected to the heat sealing frame a, and the support frame is also rotatably connected to two conveying shafts, and the two conveying shafts are respectively connected to mutually meshing gears, and the support frame is connected to a motor b connected to one of the conveying shafts.

[0011] Preferably, the hot pressing device also includes a heat sealing frame b slidably connected to the support frame, the heat sealing frame b is connected to a heating strip b, the support frame is connected to a cylinder b, the drive shaft of the cylinder b is connected to the heat sealing frame b, the support frame is also connected to a cylinder c, the drive shaft of the cylinder c is connected to the heat sealing frame c, the heat sealing frame c passes through the heat sealing frame b and extends to one side of the heat sealing frame c, and is connected to a heating strip c, and the heat sealing frame c is provided with an avoidance opening for avoiding the cylinder b.

[0012] Preferably, the hot pressing device also includes a cutting plate connected to one end of the heat sealing frame c, a heat sealing plate is slidably connected to the heat sealing frame c, the heating strip c is connected to the heat sealing plate, a spring a is connected between the cutting plate and the heat sealing plate, a cutting opening is opened between the heating strip c and the heat sealing plate, and a cutting blade is connected to the cutting plate.

[0013] Preferably, the laser coding device includes a laser arranged above the packaging bag conveying path, the intercepting plate is connected to a guide rail a, the guide rail a is slidably connected to the guide rail b, the laser is slidably connected to the guide rail b, the guide rail a and the guide rail b are respectively connected to a lead screw, the guide rail a and the guide rail b are respectively connected to a motor c, and the drive shaft of the motor c is connected to the corresponding lead screw.

[0014] Preferably, the expansion component includes a guide rod connected to the intercepting plate, the intercepting plate is slidably connected to the frame platform, the heat sealing rack c is connected to a slide rail, one end of the slide rail is inclined, and the inclined section of the slide rail cooperates with the guide rod; The pressure plate can move relative to the intercepting plate, and the pressure plate can continue to move toward the packaging belt when the intercepting plate moves downward to a predetermined position; The bottom of the intercepting plate is slidably connected to an intercepting frame, a spring b is connected between the intercepting frame and the intercepting plate, a reversing ring is rotatably connected to the intercepting plate, a connecting rod a and a connecting rod b are slidably connected to the reversing ring, the connecting rod b is rotatably connected to the intercepting frame, the pressure plate is slidably connected to one side of the intercepting plate, a connecting boss is provided on the top of the pressure plate, and the connecting rod b is rotatably connected to the connecting boss.

[0015] Preferably, a connecting opening is provided on the pressure plate, the connecting boss is slidably connected to the connecting opening, and a spring c is connected between the connecting boss and the connecting opening.

[0016] Preferably, the pressure plate can convey the packaging bag when moving relative to the intercepting plate, so that the packaging bag is closer to the intercepting plate; The bottom of the pressure plate is rotatably connected to multiple transmission shafts, and the connecting rod b is fixedly connected to the connecting rod b, and the connecting rod b is rotatably connected to the connecting boss through the connecting shaft. The connecting shaft is connected to a synchronous wheel a, and one of the transmission shafts is connected to a synchronous wheel b. The diameter of the synchronous wheel b is smaller than that of the synchronous wheel a, and a synchronous belt a is provided between the synchronous wheel a and the synchronous wheel b. The connecting shaft is rotatably connected to a tensioning rod a, and the bottom of the tensioning rod a is rotatably connected to the tensioning rod b. The top of the pressure plate is connected to a tensioning rail and a support bar, and a guide shaft is slidably connected to the tensioning rail, and a spring d is connected between the guide shaft and the tensioning rail. The guide shaft and the support bar are respectively rotatably connected to tensioning wheels, and a synchronous wheel c is provided on the transmission shaft, and a synchronous belt b is provided between every two adjacent synchronous wheels c.

[0017] In summary, the present invention mainly has the following beneficial effects: By integrating an intercepting plate and a pressure plate, this invention achieves active flattening and expansion of the bag prior to laser coding. This effectively addresses the surface wrinkling, collapse, and bulging that can occur with existing heat-sealed bags during sealing and transport. It significantly improves the flatness and stability of the coding area, providing an ideal reference surface for laser beam focusing. Compared to traditional methods that rely on vacuuming or manual smoothing, this invention eliminates the need for additional processing steps and utilizes only mechanical pressure to redistribute the gas within the bag, promoting natural surface expansion and overall tensioning of the bag, demonstrating excellent processing adaptability and equipment compatibility.

[0018] Furthermore, the continued displacement of the pressure plate after contacting the bag not only compresses the bag but also helps push it toward the interception plate, creating a stable contact position. This further expands the compression area and prevents indentations or secondary wrinkles caused by localized uneven force. This "clamping + compression" combination significantly improves surface tension and visual flatness without changing the bag's material or shape, making it particularly suitable for marking applications such as QR codes, traceability codes, and graphic symbols, which require high-quality labels.

[0019] In summary, the present invention significantly optimizes the surface state control method of packaging bags before laser coding, thereby improving product labeling quality and production line stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is another schematic diagram of the overall structure of the present invention; Figure 3 is another schematic diagram of the overall structure of the present invention; Figure 4 It is a schematic diagram of the structure of the forming tube of the present invention; Figure 5 It is a schematic structural diagram of the hot pressing device of the present invention; Figure 6 It is a schematic structural diagram of the laser coding device of the present invention; Figure 7 is another schematic diagram of the structure of the laser coding device of the present invention; Figure 8 is a schematic cross-sectional view of the expansion component structure of the present invention; Figure 9 is another schematic diagram of the expansion component structure of the present invention; Figure 10 It is a schematic diagram of the conveying shaft structure of the present invention.

[0021] Reference numerals: 100, rack platform; 101, box; 102, feed pipe; 103, forming tube; 104, hot pressing device; 105, conveying device; 106, laser coding device; 107, intercepting plate; 108, pressure plate; 200, conveying platform; 201, conveying roller; 202, conveyor belt; 203, motor a; 204, forming ring; 205, side opening; 206, connecting rod; 300, support frame; 301, heat sealing frame a; 302, heating strip a; 303, cylinder a; 304, conveyor shaft; 305, gear; 306, motor b; 307, heat sealing frame b; 308, cylinder b; 309, cylinder c; 310, heat sealing frame c; 311, heating strip c; 312, avoidance opening; 313, cutting plate; 314, heat sealing plate; 315, spring a; 316, cutting opening; 317, cutting blade; 318, heating strip b; 400, laser; 401, guide rail a; 402, guide rail b; 403, lead screw; 404, motor c; 500, guide rod; 501, slide rail; 502, interceptor; 503, spring b; 504, reversing ring; 505, connecting rod a; 506, connecting rod b; 507, connecting boss; 508, connecting opening; 509, spring c; 600, transmission shaft; 601, connecting shaft; 602, synchronous wheel a; 603, synchronous wheel b; 604, synchronous belt a; 605, tensioning rod a; 606, tensioning rod b; 607, tensioning rail; 608, support bar; 609, guide shaft; 610, spring d; 611, tensioning wheel; 612, synchronous wheel c; 613, synchronous belt b. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] refer to Figures 1-10 This embodiment provides a hot-pressing and laminating production line for sealed packaging bags. The production line includes a frame platform 100 with a box 101 fixedly mounted on top. A feed pipe 102 for conveying packaging materials is disposed within the box 101. The feed pipe 102 extends downwardly through and connects to a forming pipe 103 disposed within the box 101. The lower portion of the forming pipe 103 passes through the frame platform 100 and extends into the interior of the frame space, forming the tubular structure of the bag and guiding the injection of materials.

[0024] The packaging bag initially consists of a sheet of soft film. After being pre-wrapped around the outer wall of the forming tube 103, it transforms into a cylindrical shape supported by the forming tube 103. The bottom is then sealed as the lower end of the forming tube 103 is sealed. Subsequently, packaging material can be injected from top to bottom into the sealed bag through the feed tube 102.

[0025] A heat press device 104 is provided below the forming section. The device is located inside the frame platform 100 and is used to heat-seal and shape the lower end of the packaging bag wrapped on the forming tube 103. Each time a sealing operation is completed, a preliminarily filled sealed packaging bag is formed.

[0026] Located below the heat-pressing station is a conveyor 105. Its primary task is to receive heat-sealed and filled bags and transport them to the subsequent processing area. This conveyor 105 operates intermittently in sync with the heat-pressing cycle, remaining stationary during the sealing or cutting process and then moving the bags forward after the process is complete. This prevents bag shifting or stacking during the sealing process.

[0027] A laser marking device 106 is located on the side of the hot pressing station, primarily used to mark the outer surface of the bag with characters, codes, or graphics. To ensure laser focus and marking clarity, a set of motion mechanisms is added to this side of the station, specifically including an interceptor plate 107 and a pressure plate 108 positioned on the side of interceptor plate 107 closest to the laser 400.

[0028] The interceptor plate 107 is controlled by an expansion drive structure located between the hot pressing station and the interceptor plate 107. During the hot pressing process, the expansion drive structure is activated synchronously, driving the interceptor plate 107 to move downward in the vertical direction, effectively blocking the packaging bags on the conveying path and forming a positioning constraint.

[0029] At the same time, the pressure plate 108 on the intercepting plate 107 also participates in the action. When the intercepting plate 107 moves to the designated position, the pressure plate 108, guided by it, continues to move in the opposite direction, gradually contacting the surface of the packaging bag and applying vertical pressure to its upper surface. Because the packaging bag is already filled and still contains some gas, the pressure causes the bag to bulge outward, making its surface smooth and full.

[0030] In addition, during the continuous displacement process after the pressure plate 108 contacts the bag body, the bag body can also be pushed a certain distance, so that the bag body is closer to the side of the interception plate 107, thereby expanding the pressure area and avoiding problems such as uneven swelling of the bag body and residual wrinkles due to only local contact.

[0031] With this arrangement, the packaging film is fed in sheet form and guided into the interior of the box 101 via a guide mechanism. It wraps around the outer wall of the forming tube 103, forming a tubular structure. At this point, the packaging bag is unsealed and wraps around the outside of the forming tube 103. As the packaging bag extends downward along the forming tube 103, its lower end is sealed by the hot pressing device 104.

[0032] After the sealing is completed, the feeding pipe 102 pours the material into the packaging bag, so that the packaging bag is partially filled. Since the bottom of the bag is closed and the top is not completely sealed, there is still some residual gas in the bag, and the packaging bag is in a semi-bulging state.

[0033] After the sealing and filling are completed synchronously, the hot pressing device 104 continues the cutting operation to separate the packaging bag from the forming tube 103 to form an independent sealed finished bag. The packaging bag is transported to the subsequent station via the conveying device 105 set below to prepare for labeling and coding.

[0034] To ensure clarity and accuracy in the laser marking area, it's crucial to address issues like wrinkles, collapse, and bulging on the bag surface. Therefore, an interceptor plate 107 is installed on one side of the laser 400. Once the bag is delivered to the desired location, the interceptor plate 107 is activated and driven downward by an expansion component to a defined height, effectively intercepting and positioning the bag as it enters the laser's active area, preventing it from moving forward.

[0035] Subsequently, the pressure plate 108, mounted on the intercepting plate 107, begins to move relative to the bag. It linearly approaches the bag, ultimately compressing the bag's upper surface. Because of the residual air within the bag, the pressure from the pressure plate 108 redistributes the air within the enclosed space, causing the bag's surface to bulge outward.

[0036] To avoid uneven surface conditions caused by localized pressure, pressure plate 108 continues to move after contacting the bag, slightly pushing the bag toward interception plate 107, bringing the entire bag into contact with interception plate 107 and achieving stable clamping. The bag's surface, now taut and plump due to the combined effects of upper and lower pressure and front and rear position limits, is smooth and significantly improves the reflection conditions in the laser's focal area.

[0037] After the packaging bag is coded, the pressure plate 108 and the interception plate 107 are recovered and reset, and the bag body continues to be output to the next station by the conveying device 105.

[0038] It should be noted that in order to ensure that the timing of the pressure application process is controllable, the action of the expansion component can be coordinated with the control system setting, and selectively linked to the rhythm of the hot pressing device 104 and the conveying device 105 to avoid action interference and ensure overall rhythm coordination.

[0039] In this embodiment, the conveyor device 105 includes a conveyor platform 200 connected to the inner bottom surface of the frame platform 100. The conveyor platform 200 is used to support the packaging bags and provide a stable conveying path for them. The conveyor platform 200 is equipped with a plurality of conveyor rollers 201 arranged in sequence along the conveying direction. Each conveyor roller 201 is connected to the conveyor platform 200 via a bearing and can rotate freely, thereby supporting and guiding the operation of the conveyor belt 202.

[0040] A circular, closed conveyor belt 202, constructed of flexible material, is mounted on the outer circumferences of the multiple conveyor rollers 201. This belt, wrapped around the outer circumferences of all the conveyor rollers 201, facilitates the transport of sealed packaging bags across the platform. A motor a203 is connected to the conveyor platform 200. The drive shaft of motor a203 is connected to one of the conveyor rollers 201, providing driving force for that roller.

[0041] With the above arrangement, during operation of the device, after heat sealing and filling, the packaging bags are cut into independent units and then placed or delivered to the conveying platform 200 located inside the frame platform 100. The conveying platform 200 supports the operation of the conveyor belt 202 through multiple conveyor rollers 201 arranged thereon, and the conveyor belt 202 surrounds the outside of each conveyor roller 201.

[0042] Drive motor a203 is located on one side of the conveyor platform 200. Its drive shaft is connected to the shaft of one of the conveyor rollers 201. When motor a203 is energized, its rotating output shaft drives the connected conveyor roller 201, thereby driving the entire conveyor belt 202 along the conveyor path. Guided by multiple conveyor rollers 201, the conveyor belt 202 runs smoothly, carrying the packaging bags from the hot pressing position to the location of the intercepting plate 107 and pressure plate 108, providing accurate positioning and transmission for the flattening action before laser coding.

[0043] When a bag is about to enter the flattening station, the control logic controls motor a203 to stop, keeping conveyor belt 202 stationary. This ensures the bag remains stable in the target position before pressure is applied, preventing code deviation or bag interference caused by the operation of conveyor belt 202. After pressure application, inflation, and code marking are complete, motor a203 restarts, driving conveyor belt 202 to continue running and deliver the processed bag to the next station. Precisely controlling the drive timing of motor a203 ensures orderly conveyance and precise stopping of bags at each processing stage, making it particularly suitable for automated packaging scenarios requiring coordinated control of multiple processes.

[0044] In this embodiment, the outer wall of the forming tube 103 is provided with a plurality of forming rings 204, which are arranged sequentially along the axial direction of the forming tube 103. The inner diameter of each forming ring 204 is slightly larger than the outer diameter of the forming tube 103. The forming rings 204 are suspended from the outside of the forming tube 103 by connecting rods 206, forming an annular forming channel between the forming tube 103 and the forming tube 103. This channel is used to guide the packaging film to gradually wrap around the outer wall of the forming tube 103, keeping the film material adhered to the surface of the forming tube 103, and smoothly transforming it into a tubular structure.

[0045] When the sheet of packaging film is applied from top to bottom onto the outer wall of the forming tube 103, the film, being a single piece, naturally overlaps on one side of the tube 103 when it is closed, forming a longitudinally extending overlapped region. To facilitate subsequent heat sealing of this overlapped region, each forming ring 204 is provided with a side opening 205.

[0046] With the above arrangement, after the packaging film material enters the device, it is forced to form a cylindrical structure under the support of the forming tube 103. Since the packaging film is a sheet structure, it will naturally produce an axially overlapping film edge area outside the forming tube 103.

[0047] To ensure consistent positioning of the molding rings 204 and prevent deviation due to film tension, vibration, or external disturbances, the molding rings 204 are rigidly connected by connecting rods 206. The connecting rods 206 are fixed to the molding tube 103, ensuring that the molding rings 204 maintain a stable arrangement during operation, thereby improving the uniformity and structural consistency of the film molding.

[0048] In this embodiment, the hot pressing device 104 includes a support frame 300 fixedly mounted on the frame platform 100. Two sets of heat sealing frames a301 are slidably connected to the support frame 300. The two sets of heat sealing frames a301 can move toward or away from each other in the horizontal direction to clamp the overlapping areas of the packaging film edges.

[0049] Each heat-sealing frame a301 is fitted with a heating strip a302 near one side. This strip can be a temperature-controlled electric heating element, providing stable heat to the contact area, melting the film edges and achieving sealing. To drive the heat-sealing frames a301 for clamping and separation, a cylinder a303 is mounted on the support frame 300. Its drive shaft is connected to the heat-sealing frames a301. Control signals drive the heat-sealing frames a301 in sync, ensuring precise alignment and uniform heating during the sealing process.

[0050] Two parallel conveyor shafts 304 are also rotatably connected to the support frame 300. The ends of these conveyor shafts 304 are equipped with intermeshing gears 305, forming a synchronous linkage mechanism. One of the conveyor shafts 304 is connected to a motor b 306 mounted on the support frame 300. The output shaft of motor b 306 rotates this conveyor shaft 304, which in turn rotates the other conveyor shaft 304 through meshing transmission. This ensures stable feeding of the packaging film during the heat sealing process, ensuring continuous delivery of the film edge to the sealing area.

[0051] With this arrangement, as the packaging film moves downward through the channel formed by the forming ring 204 and the forming tube 103, its edge naturally overlaps on one side of the forming tube 103, forming a longitudinal back-seal area. This area is sealed through heating and clamping. In this embodiment, the two heat-sealing frames a301 of the side-seal device periodically clamp the film edges through a reciprocating motion controlled by a cylinder a303. When the two frames are relatively closed, the heating strips a302 precisely grip the overlapping film area in the middle.

[0052] When powered, heating strips a302 heat up, bringing the film to its melting point. This allows the upper and lower layers of film to fuse together under heat and pressure. Once sealing is complete, cylinder a303 controls the heat-sealing frame a301 to separate, preparing for the next sealing cycle. To prevent film slippage and tension fluctuations during the sealing process, which could affect seal quality, two conveyor shafts 304 provide continuous and stable traction on the packaging film.

[0053] Motor b306 drives the conveying shaft 304 connected to it to rotate, and the gear 305 mechanism causes the other conveying shaft 304 to rotate synchronously, thereby driving the film material to move forward stably in the longitudinal direction, while ensuring the stability of sealing temperature and pressure, and ensuring accurate sealing position and complete fusion.

[0054] It integrates the dual functions of heat sealing and conveying, and is particularly suitable for scenarios where the film edge needs to complete continuous side sealing (back sealing) while in motion.

[0055] In this embodiment, the hot pressing device 104 further includes a heat sealing frame b307 slidably connected to the support frame 300 , and a cylinder b308 is connected to the support frame 300 , and a driving shaft of the cylinder b308 is connected to the heat sealing frame b307 .

[0056] Furthermore, to achieve dual-stage sealing, a cylinder c309 is connected to the support frame 300, with a heat-sealing frame c310 fixed to its drive shaft. Heat-sealing frame c310 inserts into heat-sealing frame b307 and extends to one side of heat-sealing frame b307. A heat-sealing channel is formed between heat-sealing frame b307 and heat-sealing frame c310, located below the forming tube 103.

[0057] The heat sealing frame b307 is connected to a heating strip b318, and the heat sealing frame c310 is connected to a heating strip c311. The heating strip can be an electrically heated electric heating rod, and its length covers the transverse sealing area of the packaging bag.

[0058] In order to avoid interference between the cylinder b308 and the movement path of the heat sealing rack c310, an avoidance opening 312 is provided on the heat sealing rack c310 for avoiding the cylinder b308 structure, ensuring that the heat sealing rack c310 can smoothly pass through the heat sealing rack b307 area during the sealing process without affecting the independent driving function of the two groups of cylinders.

[0059] With the above arrangement, after the packaging bag is formed and the longitudinal edge is sealed, material filling is required. Therefore, a complete closed structure needs to be formed through a transverse heat sealing operation.

[0060] During operation, cylinders b308 and c309 activate synchronously, driving heat-sealing racks b307 and c310 toward the bag in opposite directions. These racks, in turn, drive heating bars b318 and c311 on them to engage in a synchronous clamping operation. The bottom of the bag lies between the two sets of heating bars, and as the two heat-sealing racks converge, the bottom film is clamped between them.

[0061] When powered, heating strips b318 and c311 contact the film layer, applying heat and pressure. This heat and pressure fuse the upper and lower film layers at the bottom of the bag, forming a secure bottom seal. Because heating strips b318 and c311 are arranged in parallel and their heating length covers the entire width of the bag, the heat seal is complete and pressure is evenly distributed, ensuring a stable seal line with no loose or leaking areas.

[0062] To achieve nesting and compatibility between the two heat-sealing frames, heat-sealing frame C310 is inserted within heat-sealing frame B307 and features a clearance opening 312. This clearance opening 312 provides space for cylinder B308 to move, preventing structural interference during synchronized operation. This nested structure ensures that the two heat-sealing components maintain independent trajectories and synchronized movements during the sealing process, achieving a simple yet highly efficient double-sided heat-sealing process.

[0063] In this embodiment, the hot pressing device 104 also includes a cutting plate 313 connected to one end of the heat sealing frame c310. The cutting plate 313 is a flat plate with one end fixed to the heat sealing frame c310. A heat sealing plate 314 is slidably connected to the heat sealing frame c310, and the heat sealing plate 314 and cutting plate 313 are connected by a spring a315.

[0064] The heating strip c311 is fixedly mounted on the heat-sealing plate 314 and is used to heat-press and seal the lower end of the packaging bag. To facilitate the cutting action, the heating strip c311 and the heat-sealing plate 314 are both equipped with cutting openings 316. The size of the opening corresponds to the position of the cutting blade 317, allowing the blade to pass through the gap formed by the heating strip and the heat-sealing plate 314.

[0065] The cutting blade 317 is mounted on the cutting plate 313 with its blade facing the bottom of the packaging bag. The cutting blade 317 can pass through the cutting opening 316 under the pressure of the spring and act on the heat-sealed film material to accurately cut the packaging bag and separate it into independent single bags.

[0066] Through the above arrangement, after the packaging bag is filled with material, it needs to be transversely sealed and cut to form an independent sealed packaging bag. First, the cylinder b308 is actuated, and its drive shaft extends to push the heat sealing frame b307 and the heating strip b318 thereon to move to the preset position of the packaging bag, ready to cooperate with the heating structure on the opposite side for sealing.

[0067] At the same time, the drive shaft of cylinder c309 contracts, driving the heat-sealing frame c310 to move as a whole. Since a cutting plate 313 is fixed to the end of heat-sealing frame c310, and cutting plate 313 is connected to heat-sealing plate 314 via spring a315, spring a315 drives heat-sealing plate 314 and its heating strip c311 to move synchronously. Heating strip c311 eventually docks with heating strip b318, pressing the bottom film layer of the packaging bag clamped between the two heating strips together while applying heat to seal the bag. After sealing is complete, cylinder c309 stops, leaving heat-sealing frame c310 in the same position. At this point, cylinder b308 continues to operate, and its drive shaft further contracts, pushing heat-sealing frame b307 to continue moving upward. Since the end of the heat sealing frame b307 structure is connected to the cutting plate 313, the blade on the cutting plate 313 then passes upward through the heat sealing plate 314 and the cutting opening 316 provided on the heating strip c311, cutting into the sealing film layer without interfering with the heating structure, thereby achieving precise cutting of the heat-sealed packaging bag.

[0068] In this embodiment, the laser coding device 106 includes a laser 400 positioned above the bag conveyor path. To enable two-dimensional movement of the laser 400 within a horizontal plane, improving the flexibility and accuracy of coding positioning, a guide rail a401 is connected to the intercepting plate 107. A guide rail b402 is slidably connected to the guide rail a401, which can move along the extension direction of the guide rail a401, forming a first direction.

[0069] The laser 400 is slidably connected to the guide rail b402 and can move along the length of the guide rail b402, forming a second direction. This forms a planar biaxial structure, allowing the laser 400 to switch to any position within the plane defined by the guide rails a401 and b402, allowing for laser marking of different areas of the packaging bag.

[0070] To achieve this, guide rails a401 and b402 are each connected to a corresponding lead screw 403, each driven by a separate motor c404. The drive shaft of each motor c404 is connected to the corresponding lead screw 403. The motor drives the lead screw 403 to rotate, driving the connected guide rail or laser 400 slider to move linearly, thereby achieving two-dimensional positioning control of the laser 400.

[0071] With the above arrangement, after the package is conveyed to the laser coding station and stopped by interceptor plate 107, laser 400 is activated. Motor c404 rotates lead screw 403 on guide rail a401, thereby driving guide rail b402, which is slidably connected thereto, to move along guide rail a401. As guide rail b402 moves, position adjustment in the first direction is achieved.

[0072] Subsequently, the second motor c404 drives the lead screw 403 on the guide rail b402 to rotate, further driving the laser 400 to slide in the length direction of the guide rail b402, thereby achieving position control in the second direction.

[0073] Through the precise coordination of the two motors and the lead screw 403 structure, the laser 400 can achieve precise laser coding within a plane range on different areas of the surface of the packaging bag, such as printing QR codes, characters, graphics and other information.

[0074] In this embodiment, the expansion member comprises a guide rod 500 connected to the interception plate 107, which cooperates with a slide rail 501 provided on the heat sealing frame c310. The interception plate 107 is slidably connected to the frame platform 100 and is used to move downward under predetermined action conditions to intercept or release the packaging bag.

[0075] Specifically, the slide rail 501 is fixedly mounted on the heat-sealing rack c310. One end of the rail is inclined, meaning it has a downwardly sloping guide section that engages with the guide rod 500 on the intercepting plate 107. As the heat-sealing rack c310 moves laterally, the inclined section of the rail 501 compresses the guide rod 500, thereby causing the intercepting plate 107 to move vertically.

[0076] With this arrangement, when the telescopic shaft of cylinder b308 extends and that of cylinder c309 retracts to seal the bag, the heat-sealing frame c310 drives the slide rail 501 toward the connecting plate, and the inclined section at the front of the slide rail 501 gradually compresses the guide rod 500. Because the guide rod 500 is fixedly connected to the intercepting plate 107, the continuous pressure of the inclined slide rail 501 causes the guide rod 500 to move vertically, forcing the intercepting plate 107 to move downward along the set path.

[0077] As the interceptor plate 107 moves downward, its bottom gradually approaches the conveyor 105, effectively stopping the bag in the coding area. At this point, the bag is positioned and confined within a fixed area, with its surface flattened, facilitating subsequent compression and swelling by the pressure plate 108 and precise coding by the laser 400.

[0078] Since the packaging bag will enter the coding stage after the heat-sealing process is completed, the bag body needs to be positioned and flattened first to ensure that the coding area is stable and flat. The downward pressure of the interception plate 107 is essentially the starting point of this positioning process. If the action of the interception plate 107 depends on an additional control unit, it will inevitably introduce new control logic, causing timing interference and structural complexity. However, by setting the inclined section of the slide rail 501 and the matching structure of the guide rod 500, the interception action is directly triggered by the working rhythm of the heat-sealing frame c310, which can ensure that the interception behavior is strictly synchronized with the moment when the heat sealing of the packaging bag is completed, realizing a closed-loop action without the need for additional control signals.

[0079] In other words, each downward movement of the heat-sealing rack C310 not only executes the seal but also signals the timing for the interception mechanism to activate. By leveraging the sealing mechanism to drive the expansion mechanism, not only does the linkage between the two mechanisms become natural, but the movements are also perfectly synchronized, preventing problems such as bag deviation, misalignment, and unsuccessful flattening caused by delayed interception.

[0080] In this embodiment, an interception frame 502 is slidably connected to the bottom of the interception plate 107, and a spring b503 is connected between the interception frame 502 and the interception plate 107. The interception frame 502 is mounted below the interception plate 107 and is configured to contact the conveyor 105 during the movement of the interception plate 107. The spring b503 is used to form a compressible connection between the interception frame 502 and the interception plate 107, allowing them to produce relative displacement under load.

[0081] The intercepting plate 107 is rotatably connected to a reversing ring 504, which is a disc structure and can produce angular displacement when the intercepting plate 107 continues to descend. The reversing ring 504 is slidably connected to a connecting rod a505 and a connecting rod b506, and the connecting rod a505 is hinged to the intercepting frame 502.

[0082] The pressure plate 108 is slidably connected to one side of the intercepting plate 107 and is used to move in the vertical direction to approach and press the surface of the packaging bag. A connecting boss 507 is provided on the pressure plate 108, and the connecting rod b506 is hinged on the connecting boss 507.

[0083] Through the above arrangement, the interception plate 107 moves downward, and the interception frame 502 arranged at the bottom thereof also descends, eventually contacting the surface of the conveyor belt 202 where the packaging bag is located and forming a physical limit, thereby realizing the positioning interception of the packaging bag.

[0084] Afterwards, the intercepting plate 107 continues to press downward, while the intercepting frame 502 can no longer move downward. During this force transmission process, the spring b503 is compressed, causing the intercepting plate 107 to slide relative to the intercepting frame 502. Simultaneously, the reversing ring 504 on the intercepting plate 107 begins to rotate, driving the connecting rod a505 and the connecting rod b506 slidingly connected thereto to engage in a coordinated manner. The connecting rod b506 is hinged to the connecting boss 507 on the top of the pressure plate 108, and converts the rotational displacement into a vertical downward thrust, causing the pressure plate 108 to move downward along the sliding groove on one side of the intercepting plate 107.

[0085] Finally, the bottom surface of pressure plate 108 contacts the packaging bag on conveyor belt 202 and applies pressure to its upper surface. Because the packaging bag is sealed and contains gas, the pressure causes the bag to expand in a controlled manner, tightening and flattening the bag surface, thus providing a stable and focusable base for subsequent laser marking.

[0086] Based on the above structure, the pressure plate 108 is provided with a connecting opening 508, which is a strip-shaped sliding groove structure arranged along the pressure direction. The connecting boss 507 is slidably connected in the connecting opening 508, allowing the connecting boss 507 to move relative to it in the vertical direction.

[0087] In order to achieve force buffering and fit adaptation during the pressing process, a spring c509 is connected between the connecting boss 507 and the connecting opening 508. The spring structure is used to provide a continuous downward thrust to the pressure plate 108 when the connecting rod b506 drives the connecting boss 507 to move, while allowing flexible compression to be generated when the bag surface contacts or encounters resistance, thereby playing a buffering and adaptation role.

[0088] With the above settings, since the packaged material in the packaging bag may have certain density fluctuations, different air residues, or different elasticity of the film material, if the pressure process is driven completely rigidly, it may lead to excessive pressure, causing local indentation, bulging and imbalance of the bag, and even damage to the sealing area.

[0089] To this end, a spring c509, positioned between the connecting boss 507 and the connecting opening 508, automatically compresses when the pressure plate 108 contacts the bag surface, providing a flexible cushioning effect. When the bag is filled with gas or has a strong rebound force, the compression of the spring c509 absorbs excess travel, preventing the connecting boss 507 from continuing to press down and causing excessive pressure. Furthermore, when the bag surface has not yet fully flattened, the spring c509 provides a stable, continuous pressure, pushing the pressure plate 108 into contact and promoting the bag's surface to swell and flatten.

[0090] This structure introduces buffering and adaptive functions through spring c509, giving the originally rigid connecting rod transmission system flexible adjustment capabilities, realizing dynamic control of the compression force of the packaging bag, and effectively improving the system's adaptability to different bag types and packaging states.

[0091] In this embodiment, the bottom of the pressure plate 108 is rotatably connected to multiple transmission shafts 600. These shafts 600 are arranged sequentially along the conveying direction of the packaging bag, contacting the surface of the packaging bag during the pressure application process, achieving a small-scale pushing motion. One of the transmission shafts 600 serves as the active output shaft, connected to a synchronous pulley b603. The remaining transmission shafts 600 are each equipped with synchronous pulleys c612. Any two adjacent synchronous pulleys c612 are connected by a synchronous belt b613, forming a multi-axis parallel transmission system.

[0092] Connecting rod b506 is fixedly connected to a connecting shaft 601, which is rotatably connected to the connecting boss 507. This allows connecting rod b506 to transmit torque to connecting shaft 601 when driven by the reversing ring 504. A synchronous pulley a602 is mounted on connecting shaft 601, and its diameter is larger than that of synchronous pulley b603. Synchronous pulley a602 is connected to synchronous pulley b603 on the active transmission shaft 600 via a synchronous belt a604. This wheel diameter configuration creates a decelerating and force-amplifying transmission relationship.

[0093] To ensure that synchronous belt a604 maintains tension even in the event of structural deformation or sliding of the connecting boss 507, a tensioning rod a605 is rotatably connected to the connecting shaft 601. The bottom of tensioning rod a605 is rotatably connected to tensioning rod b606. A tensioning track 607 and a support bar 608 are also provided on the top of the pressure plate 108. A guide shaft 609 is slidably connected within tensioning track 607. A spring d610 is connected between guide shaft 609 and tensioning track 607 to provide a constant rebound force for the tensioning structure. Tensioning pulleys 611 are rotatably connected to guide shaft 609 and support bar 608, respectively. Tensioning pulleys 611 engage synchronous belt a604 and automatically adjust the tension of the synchronous belt. Tensioning rod b606 is rotatably connected to guide shaft 609.

[0094] With this arrangement, when the reversing ring 504 rotates under force, the dynamic link b506 swings downward, causing the connecting shaft 601 on the link b506 to move downward. Because one end of the connecting shaft 601 is pivotally connected to the connecting boss 507, the connecting shaft 601 both moves and rotates relative to the axis of the connecting boss 507, thereby achieving power introduction.

[0095] As the connecting shaft 601 is pressed downward, the synchronous wheel a602 mounted on it rotates accordingly, driving the synchronous wheel b603 connected to the transmission shaft 600 at the bottom of the pressure plate 108 via a synchronous belt a604. Because the synchronous wheel b603 is connected to the synchronous wheels c612 on the remaining transmission shafts 600 via a synchronous belt b613, the rotation of the synchronous wheel b603 further drives the synchronous rotation of the other transmission shafts 600, achieving a coordinated output across the entire bottom of the pressure plate 108.

[0096] As the pressure plate 108 presses down on the bag, the multiple conveyor shafts 600 at its base are driven to rotate by a synchronous belt system, exerting a horizontal thrust on the surface of the bag in contact. This thrust causes the bag to slightly move forward under pressure, forcing it closer to the intercepting plate 107 for a stable contact. This, in turn, expands the pressure area, helps the bag expand evenly, and improves the tension and flatness of the code marking area.

[0097] During the transmission process, due to the relative sliding structure between the connecting boss 507 and the connecting rod b506, the connecting shaft 601 will simultaneously slip to a certain extent when pushed downward, causing the tension of the synchronous belt a604 to fluctuate or slacken. To this end, a tensioning mechanism is provided. Specifically, the pressure plate 108 moves downward, driven by the connecting rod b506 and the connecting boss 507, with its bottom contacting the surface of the packaging bag and exerting downward pressure. When the pressure plate 108 applies a predetermined pressure to the packaging bag, the gas inside the packaging bag is compressed, and the interceptor frame 502 forms a limit. At this time, the continued downward movement of the pressure plate 108 causes the connecting boss 507 to slide relative to the surface, and the spring c509 is compressed and deformed.

[0098] During the remaining downward movement, the connecting shaft 601 and the connecting boss 507 move downward, causing the tensioning rod a605 connected thereto to swing. The swinging of the tensioning rod a605 causes the tensioning rod b606, hinged at its bottom, to deflect angularly, further causing the guide shaft 609 connected to the tensioning rod b606 to slide along a set path within the tensioning track 607.

[0099] The sliding of guide shaft 609 moves the tensioning pulley 611 mounted on it, actively applying pressure to timing belt a604 and compensating for belt tension. Spring d610, located between guide shaft 609 and tensioning track 607, provides compressible support during guide shaft 609's sliding, adjusting the compression force and assisting in the return of guide shaft 609 when the system is depressurized.

[0100] In summary, the present invention utilizes a cleverly linked structure, leveraging the synchronized action of interceptor plate 107 and hot pressing device 104 to achieve bag positioning. Combined with a linkage system and tensioning transmission structure, the synchronous belt drive and tensioning compensation are triggered after the pressure plate 108 completes effective compression, achieving coordinated control of bag flattening, expansion, and steady-state conveyance. This compact and precise device significantly improves the flatness and positioning stability of the bag's code marking area.

[0101] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A hot pressing composite production line for sealed packaging bags, characterized in that: include: RackPlatform(100); A box (101) is provided on the top of the frame platform (100), wherein a feed pipe (102) is provided in the box (101); A forming tube (103) disposed in the box body (101) is communicated with the feed tube (102), and its bottom passes through the frame platform (100) and extends into the interior thereof; A hot pressing device (104) provided in the frame platform (100) is used for conveying packaging bags and sealing the packaging bags; A conveying device (105) provided inside the frame platform (100), located at the bottom of the hot pressing device (104), and used for conveying the sealed packaging bags; A laser marking device (106) provided on one side of the hot pressing device (104) is used to emit a laser beam to the packaging bag to mark fonts on the packaging bag; An interception plate (107) is provided on one side of the laser coding device (106), and a pressure plate (108) is provided on a side of the interception plate (107) close to the laser coding device (106); An expansion component is provided between the hot pressing device (104) and the intercepting plate (107), and is used to move the intercepting plate (107) and the pressure plate (108), so that the pressure plate (108) presses the packaging bag. The expansion component can move the intercepting plate (107) and the pressure plate (108) when the hot pressing device (104) seals the packaging bag.

2. A hot-pressing composite production line for sealed packaging bags according to claim 1, characterized in that: The conveying device (105) includes a conveying platform (200) connected to the inner bottom surface of the frame platform (100), a plurality of conveying rollers (201) are connected to the conveying platform (200), a conveying belt (202) is commonly sleeved on the plurality of conveying rollers (201), a motor a (203) is connected to the conveying platform (200), and a driving shaft of the motor a (203) is connected to one of the conveying rollers (201).

3. The hot-pressing composite production line for sealed packaging bags according to claim 1, characterized in that: The outer wall of the forming tube (103) is provided with a plurality of forming rings (204), the inner diameter of the forming ring (204) is larger than the outer diameter of the forming tube (103), a forming channel is provided between the forming ring (204) and the forming tube (103), a side opening (205) is provided on one side of the forming ring (204), and a connecting rod (206) is connected between the plurality of forming tubes (103), and the connecting rod (206) is fixedly connected to the forming tube (103).

4. The hot-pressing composite production line for sealed packaging bags according to claim 1, characterized in that: The hot pressing device (104) includes a support frame (300) connected to the frame platform (100), two heat sealing frames a (301) are slidably connected to the support frame (300), and heating strips a (302) are respectively connected to the two sides of the two heat sealing frames a (301) close to each other. A cylinder a (303) is connected to the support frame (300), and its drive shaft is connected to the heat sealing frame a (301). The support frame (300) is also rotatably connected to two conveying shafts (304), and the two conveying shafts (304) are respectively connected to mutually meshing gears (305). The support frame (300) is connected to a motor b (306) connected to one of the conveying shafts (304).

5. The hot-pressing composite production line for sealed packaging bags according to claim 4, characterized in that: The hot pressing device (104) further includes a heat sealing frame b (307) slidably connected to the support frame (300), a heating strip b (318) being connected to the heat sealing frame b (307), a cylinder b (308) being connected to the support frame (300), a drive shaft of the cylinder b (308) being connected to the heat sealing frame b (307), a cylinder c (309) being further connected to the support frame (300), a heat sealing frame c (310) being connected to a drive shaft of the cylinder c (309), the heat sealing frame c (310) passing through the heat sealing frame b (307) and extending to one side of the heat sealing frame c (310), a heating strip c (311) being connected to the heat sealing frame c (310), and a bypass opening (312) for bypassing the cylinder b (308) being provided on the heat sealing frame c (310).

6. The hot-pressing composite production line for sealed packaging bags according to claim 5, characterized in that: The hot pressing device (104) further includes a cutting plate (313) connected to one end of the heat sealing frame c (310), a heat sealing plate (314) is slidably connected to the heat sealing frame c (310), the heating strip c (311) is connected to the heat sealing plate (314), a spring a (315) is connected between the cutting plate (313) and the heat sealing plate (314), a cutting opening (316) is provided on the heating strip c (311) and the heat sealing plate (314), and a cutting blade (317) is connected to the cutting plate (313).

7. The hot-pressing composite production line for sealed packaging bags according to claim 1, characterized in that: The laser coding device (106) includes a laser (400) arranged above the packaging bag conveying path, the intercepting plate (107) is connected to a guide rail a (401), the guide rail a (401) is slidably connected to a guide rail b (402), the laser (400) is slidably connected to the guide rail b (402), the guide rail a (401) and the guide rail b (402) are respectively connected to a lead screw (403), the guide rail a (401) and the guide rail b (402) are respectively connected to a motor c (404), and the drive shaft of the motor c (404) is connected to the corresponding lead screw (403).

8. The hot-pressing composite production line for sealed packaging bags according to claim 5, characterized in that: The expansion component includes a guide rod (500) connected to the intercepting plate (107), the intercepting plate (107) is slidably connected to the rack platform (100), and a slide rail (501) is connected to the heat sealing rack c (310), one end of the slide rail (501) is inclined, and the inclined section of the slide rail (501) cooperates with the guide rod (500); The pressure plate (108) is movable relative to the interception plate (107), and the pressure plate (108) is capable of continuing to move toward the packaging belt when the interception plate (107) moves downward to a predetermined position; The bottom of the intercepting plate (107) is slidably connected to an intercepting frame (502), a spring b (503) is connected between the intercepting frame (502) and the intercepting plate (107), a reversing ring (504) is rotatably connected to the intercepting plate (107), a connecting rod a (505) and a connecting rod b (506) are slidably connected to the reversing ring (504), the connecting rod b (506) is rotatably connected to the intercepting frame (502), the pressure plate (108) is slidably connected to one side of the intercepting plate (107), a connecting boss (507) is provided on the top of the pressure plate (108), and the connecting rod b (506) is rotatably connected to the connecting boss (507).

9. The hot-pressing composite production line for sealed packaging bags according to claim 8, characterized in that: A connecting opening (508) is provided on the pressure plate (108), the connecting boss (507) is slidably connected in the connecting opening (508), and a spring c (509) is connected between the connecting boss (507) and the connecting opening (508).

10. The hot-pressing composite production line for sealed packaging bags according to claim 8, characterized in that: The pressure plate (108) is capable of conveying the packaging bag when moving relative to the interception plate (107), so that the packaging bag is closer to the interception plate (107); The bottom of the pressure plate (108) is rotatably connected to a plurality of transmission shafts (600), the connecting rod b (506) is fixedly connected to a connecting shaft (601), the connecting rod b (506) is rotatably connected to the connecting boss (507) via the connecting shaft (601), the connecting shaft (601) is connected to a synchronous wheel a (602), one of the transmission shafts (600) is connected to a synchronous wheel b (603), the diameter of the synchronous wheel b (603) is smaller than that of the synchronous wheel a (602), a synchronous belt a (604) is provided between the synchronous wheel a (602) and the synchronous wheel b (603), the connecting shaft (601) is rotatably connected to a tensioning rod a (605), the bottom of the tensioning rod a (605) is rotatably connected to the tensioning rod b (606), the top of the pressure plate (108) is connected to the tensioning track (607) and the support bar (608), the tensioning track (607) is slidably connected to a guide shaft (609), a spring d (610) is connected between the guide shaft (609) and the tensioning track (607), the guide shaft (609) and the support bar (608) are respectively rotatably connected to tensioning wheels (611), the transmission shaft (600) is provided with a synchronous wheel c (612), and a synchronous belt b (613) is provided between every two adjacent synchronous wheels c (612).

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