A sealing machine for food packaging

Abstract

This invention relates to the field of food packaging technology, and more particularly to a sealing machine for food packaging. It includes a frame and a feed pipe. The frame is equipped with a vertical heat-sealing mechanism and a horizontal heat-sealing mechanism. The horizontal heat-sealing mechanism includes two sets of horizontal heat-sealing machines. A pry bar is rotatably mounted on the frame below both ends of the two sets of horizontal heat-sealing machines. Each pry bar has a straight groove at both ends, and an insert rod is embedded in each groove. The insert rod in the upper groove is fixedly connected to the horizontal heat-sealing machine, and the insert rod in the lower groove is fixedly connected to a horizontally movable plate. Each set of movable plates has a flared support on its opposite side. By using the support to hold the formed packaging film, the lower end of the packaging bag is isolated from the heat seal. Food can only impact the support, thus avoiding material stretching and deformation at the seal, misalignment of the sealing layer, or even local cracking caused by material impact, resulting in a "drop-open" phenomenon and the risk of air leakage, liquid seepage, or microbial contamination.

Description

Technical Field

[0001] This invention relates to the field of food packaging technology, and in particular to a sealing machine for food packaging. Background Technology

[0002] With the rapid development of the frozen food industry, hot pot ingredients, such as frozen dumplings and hot pot meatballs, have become increasingly popular due to their convenience in consumption, purchase, and storage. These foods require long-term frozen storage, placing extremely high demands on the sealing, impact resistance, and leak-proof properties of their packaging. However, in traditional packaging processes, the dynamic coordination between the food feeding stage and the heat-sealing process often leads to sealing defects, directly affecting product quality and shelf life.

[0003] Currently, vertical packaging machines have become the mainstream packaging equipment for frozen foods due to their high efficiency and continuous operation. Their workflow typically includes: roll film bag making, material filling, heat sealing and cutting, and finished product output. The heat sealing mechanism consists of a heat sealing strip and a cutter, which seals and cuts the packaging bag through instantaneous high temperature and pressure. However, during high-speed operation, frozen foods, such as frozen dumplings and meatballs, are hard and experience significant impact from gravity when falling from the hopper into the packaging bag, directly affecting the heat-sealing area. If the heat-sealed area is still in a molten state and not fully solidified, or if it has solidified but is still subject to material impact, it may cause the material at the seal to stretch and deform, the sealing layer to misalign, or even crack locally, resulting in a "drop-open" phenomenon, leading to risks of air leakage, liquid seepage, or microbial contamination.

[0004] While existing technologies have mitigated this problem by optimizing heat-sealing temperature, extending cooling time, or improving the toughness of packaging materials, the actual effectiveness is limited by equipment cycle time efficiency and cost control. Furthermore, simply reducing the feeding speed significantly impacts packaging capacity, making it difficult to meet the demands of large-scale production.

[0005] Therefore, there is an urgent need for a device that can effectively isolate material impacts without sacrificing equipment operating efficiency. Summary of the Invention

[0006] The purpose of this invention is to solve the problems existing in the prior art, and to propose a food packaging sealing machine that effectively isolates material impact and reduces the probability of packaging bags "falling open" while minimizing the impact on equipment operating efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A sealing machine for food packaging includes a frame and a feed pipe. The frame is equipped with a vertical heat sealing mechanism for sealing the vertical edges of the packaging film and a horizontal heat sealing mechanism for sealing the ends of the packaging film.

[0009] The transverse heat sealing mechanism includes two sets of transverse heat sealing machines. The two sets of transverse heat sealing machines are driven by a drive mechanism to move synchronously relative to each other or in opposite directions. A pry bar is rotatably installed on the frame below both ends of the two sets of transverse heat sealing machines. Both ends of the pry bar are provided with straight grooves, and a rod is embedded in each straight groove. The rod in the upper straight groove is fixedly connected to the transverse heat sealing machine, and the rod in the lower straight groove is fixedly connected to a horizontally movable plate. Both sets of movable plates have flared hoppers on their opposite sides. The minimum diameter of the hopper is located above the lower port of the formed packaging film.

[0010] Preferably, the vertical heat sealing mechanism includes a film guide tube fixed on the frame, the film guide tube being sleeved on the material tube, the inner wall of the film guide tube being separated from the outer wall of the material tube, the film guide tube having an opening on the side opposite to the direction of the packaging film introduction, and guide plates for closing the vertical edges of the packaging film on both sides of the opening, and a vertical heat sealing machine that can be driven to move is provided on both sides of the opening on the frame, and the guide plates having notches.

[0011] Preferably, the horizontal cross-section of the guide plate gradually closes away from the material pipe.

[0012] Preferably, the opening is flared at the top.

[0013] Preferably, the horizontal heat sealing machine includes symmetrically arranged mounting frames, with the upper insert rod fixed to the end of the mounting frame. Two sets of mounting frames have heat-insulating knife holders suspended on opposite sides. Each of the two knife holders has a groove on opposite sides. A fixed heat sealing knife is fixed in one groove, and a movable heat sealing knife matching the fixed heat sealing knife is slidably installed in the other groove. An elastic element is provided between the movable heat sealing knife and the corresponding groove. The end face of the fixed heat sealing knife has a clearance groove, and a cutting knife that penetrates the movable heat sealing knife is fixed in the groove corresponding to the movable heat sealing knife.

[0014] Preferably, a guide hopper is rotatably mounted on the frame below the moving plate, and an elastic element is provided between the guide hopper and the frame. A pry bar is rotatably mounted on the frame between the two sets of moving plates, with the lower end of the pry bar abutting against the side of the guide hopper and the upper end of the pry bar extending above the moving plate.

[0015] Preferably, the driving mechanism includes two sets of guide rods horizontally slidably mounted on the frame. The two sets of guide rods are located on both sides of the mounting frame. The two ends of the two mounting frames are slidably connected to the corresponding side guide rods. The guide rods are driven by a motor fixed on the frame via a crank-slider mechanism. A slider is vertically slidably mounted on the frame at the center line of the two sets of horizontal heat sealers. Two connecting rods are rotatably mounted on the slider. The two connecting rods are rotatably connected to the ends of the two sets of mounting frames.

[0016] Preferably, both sets of horizontal heat sealing machines are provided with clamping plates at their lower ends, and both clamping plates are folded in half with the bends of the two clamping plates corresponding to each other.

[0017] Preferably, the upper end of the film-guiding tube is provided with a shoulder for spreading and guiding the packaging film.

[0018] Preferably, it also includes a film feeding mechanism for conveying the packaging film downwards.

[0019] Compared with the prior art, the present invention provides a sealing machine for food packaging, which has the following beneficial effects:

[0020] 1. This invention, in order to mitigate the impact of food falling onto the heat-sealed port of the packaging bag, includes two sets of symmetrical support hoppers positioned below the horizontal heat-sealing mechanism. During feeding, the smallest diameter of the support hoppers interlocks with each other above the lower sealing edge of the formed packaging film. The clamping action of the support hoppers on the formed packaging film effectively isolates the lower heat-sealed port of the packaging bag. Food falling from the feed tube only impacts the support hoppers, thus avoiding material stretching and deformation at the sealing point, misalignment of the sealing layer, or even localized cracking caused by material impact, resulting in a "fall-open" phenomenon and the risk of air leakage, liquid seepage, or microbial contamination. Furthermore, the two sets of support hoppers move closer and further apart as the horizontal heat-sealing machine approaches, requiring no additional separate operating time, thus not affecting the overall operation of the equipment or the feeding progress.

[0021] 2. In this invention, to further mitigate the impact of the packaging bag upon landing, a guide hopper is rotatably mounted on the frame below the support bucket, and a pry bar is rotatably mounted on the frame between two sets of moving plates, with the lower end of the pry bar abutting against the side of the guide hopper. When the support bucket lifts and clamps the packaging bag, the moving plate deflects against the upper end of the pry bar, thereby causing it to sink against the end of the guide hopper, providing sufficient space above the guide hopper for the natural descent of the packaging bag, allowing the lower end of the packaging bag to extend downwards. When the two sets of support buckets separate and are in the packaging falling position, the moving plate separates from the pry bar, and the guide hopper tilts upwards under the upward force of the elastic element, bringing the guide hopper as close as possible to the packaging bag, reducing the bag's falling height, thereby mitigating the impact of the falling bag and reducing the probability of the seal breaking open.

[0022] 3. In this invention, a film-guiding tube is provided, with a through-hole on the side wall of the film-guiding tube. Guide plates are provided on both sides of the opening, and the guide plates have notches. The guide plates guide and clamp the vertical edges of the packaging film to close them. The notches allow the vertical heat-sealing machine to pass through the notches and imprint itself onto the packaging film for vertical edge closure and heat sealing. This prevents the vertical edges of the packaging film from coming undone, thus avoiding the vertical edges from spreading during heat sealing and affecting the heat sealing effect.

[0023] Other advantages, objectives and features of the invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art from an examination of the hereinafter; or may be learned from the practice of the invention. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of the front view axis of the present invention.

[0025] Figure 2 This is a three-dimensional schematic diagram of the rear-view axis of the present invention.

[0026] Figure 3 This is a three-dimensional schematic diagram of the present invention after the outer shell has been removed.

[0027] Figure 4 For the present invention Figure 3 A 3D diagram showing the rack removed.

[0028] Figure 5 For the present invention Figure 3 A frontal view diagram.

[0029] Figure 6 For the present invention Figure 5 A schematic diagram of the cross-section at point AA.

[0030] Figure 7 For the present invention Figure 5 Schematic diagram of the cross-section at BB.

[0031] Figure 8 This is a schematic diagram showing the installation and cooperation of the knife holder and heat sealing knife in the transverse heat sealing mechanism of the present invention.

[0032] Figure 9 The figures show a perspective view, a front view, and a horizontal cross-sectional view of the membrane tube and the shoulder of the present invention.

[0033] Figure 10 For the present invention Figure 4 A three-dimensional schematic diagram of the central vertical heat sealing mechanism.

[0034] Figure 11 For the present invention Figure 4 A three-dimensional schematic diagram of the packaging film conveying and guiding mechanism.

[0035] Figure 12 For the present invention Figure 6 Top view of the packaging film conveying and guiding mechanism.

[0036] Figure 13 For the present invention Figure 4 A three-dimensional schematic diagram of the cooperation between the transverse heat sealing mechanism and the support bucket.

[0037] Figure 14 For the present invention Figure 13 Side view plan.

[0038] Figure 15 For the present invention Figure 4 A three-dimensional schematic diagram of the cooperation between the central support hopper and the guide hopper.

[0039] Figure 16 For the present invention Figure 15Schematic diagram of the central support bucket and its drive installation structure.

[0040] Figure 17 For the present invention Figure 14 A partial schematic diagram at point C.

[0041] Figure 18 This is a cross-sectional schematic diagram of the two sets of buckets of the present invention in the closed state.

[0042] Figure 19 For the present invention Figure 4 A partial schematic diagram of point D in the diagram.

[0043] In the diagram: 1. Frame; 2. Control cabinet; 3. Material pipe; 4. Packaging film; 5. Film dispensing mechanism; 6. Film guide tube; 7. Shoulder; 8. Vertical heat sealer; 9. Opening; 10. Guide plate; 11. First support; 12. First telescopic rod; 13. Roller; 14. Belt; 15. Universal joint; 16. Connecting rod; 17. Gear; 18. Auxiliary film feeding mechanism; 19. Guide cylinder; 20. Guide rod; 21. Mounting frame; 22. Horizontal heat sealer; 23. Crank-slider mechanism ; 24. Connecting rod; 25. Slider; 26. Guide post; 27. Moving plate; 28. Guide shaft; 29. ​​Bucket; 30. Truss; 31. Crowbar; 32. Crowbar; 33. Guide hopper; 34. Elastic component two; 35. Clamping plate; 36. Second support; 37. Second telescopic rod; 38. Notch; 2201. Knife holder; 2202. Fixed heat sealing knife; 2203. Moving heat sealing knife; 2204. Elastic component one; 2205. Cutting knife; 2206. Relief groove. Detailed Implementation

[0044] The following will refer to the appendices in the embodiments of the present invention. Figure 1-19 The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0045] Example 1: In order to reduce the probability of material stretching and deformation, misalignment of sealing layer or even local cracking at the sealing point due to material impact while minimizing the impact on the packaging efficiency of the equipment, this example provides a sealing machine for food packaging, including a frame 1 and a material pipe 3 disposed on the side of the frame 1. The machine is characterized in that the frame 1 is provided with a vertical heat sealing mechanism for sealing the vertical edge of the packaging film 4 and a horizontal heat sealing mechanism for sealing the port of the packaging film 4.

[0046] The transverse heat sealing mechanism includes two sets of transverse heat sealing machines 22. The two sets of transverse heat sealing machines 22 are driven by a drive mechanism to move synchronously relative to each other or in opposite directions. A pry bar 31 is rotatably installed on the frame 1 below both ends of the two sets of transverse heat sealing machines 22. Both ends of the pry bar 31 are provided with straight grooves, and a rod is embedded in each straight groove. The rod in the upper straight groove is fixedly connected to the transverse heat sealing machine 22, and the rod in the lower straight groove is fixedly connected to a horizontally movable plate 27. The opposite side of the two sets of movable plates 27 is provided with an flared hopper 29. The minimum diameter of the hopper 29 is located above the lower port of the formed packaging film 4.

[0047] Specifically:

[0048] The frame 1 is a frame structure formed by welding or bolting steel, serving as the mounting and suspension foundation for the internal equipment. The frame 1 is also bolted to sheet metal to form the outer shell, creating a semi-enclosed structure. Ventilation holes are provided on the outer shell to facilitate ventilation and heat dissipation for the internal equipment. An observation port, made of transparent material such as tempered glass, is located on the front side for observing the operational status of the internal food packaging. A control cabinet 2 is bolted to the outside of the frame 1 to control the operation and shutdown of the equipment.

[0049] The material pipe 3 is inserted and installed on the front side of the top wall of the frame 1 (only the straight part of the material pipe 3 is shown in the figure; the bucket shape and the part that connects with the feeding structure that conveys food are not shown). The material pipe 3 is suspended.

[0050] A film roller is rotatably mounted on the rear side of the frame 1, and the film roller is used to mount the winding packaging film 4. A film delivery mechanism 5 is provided on the frame 1, which tightly abuts against the surface of the packaging film 4 winding to brake the conveying movement of the packaging film 4. Multiple sets of guide rollers are provided on the frame 1 to guide and pull the packaging film 4 towards the feed tube 3. Multiple sets of tensioning mechanisms are also provided on the frame 1 to keep the packaging film 4 taut and prevent the packaging film 4 from being loose during conveying, which would affect the subsequent heat sealing process.

[0051] See attached document Figure 3 Appendix Figure 11 Appendix Figure 12As shown, the frame 1 is equipped with a film feeding mechanism for conveying packaging film downwards. The film feeding mechanism includes two first supports 11 fixed on the frame 1, which are symmetrically arranged along the left and right sides of the material pipe 3. A first telescopic rod 12 is fixed to each of the two first supports 11. A first bracket is fixed to the output end of the first telescopic rod 12. Rollers 13 are vertically and rotatably mounted on the first bracket at intervals. A belt 14 is fitted onto both rollers 13, and the two sets of belts 14 symmetrically abut against the packaging film 4. The rotation shaft of either roller 13 on both sides is connected to a connecting rod 16 via a universal joint 15. The other ends of both connecting rods 16 are connected to gears 17 via another universal joint 15. The two gears 17 are rotatably mounted on the frame 1 and mesh with each other. One of the gears 17 is connected to the output shaft of a reduction motor fixed on the frame 1. The geared motor can drive two gears 17 to rotate simultaneously, which in turn drives two sets of belts 14 to roll synchronously through universal joint 151, connecting rod 16, and universal joint 152. The belts roll in opposite directions and pull the packaging film 4 downward through compression and friction, thereby realizing the conveying of the packaging film 4.

[0052] The first telescopic rod 12 can drive the first bracket to move horizontally left and right, thereby driving the two sets of belts 14 to move closer or further apart, facilitating the initial introduction and passage of the packaging film 4.

[0053] Preferably, belt 14 is a toothed synchronous belt. This ensures stable conveying of belt 14 and prevents slippage that could affect the conveying of packaging film 4.

[0054] Preferably, the connecting rod 16 is a telescopic sleeve rod, which can be extended or retracted according to the on-site assembly dimensions.

[0055] Preferably, multiple sets of auxiliary film feeding mechanisms 18 are also provided at intervals on the frame 1 behind the feed tube 3 to assist the belt 14 in guiding the packaging film 4 downwards. Each auxiliary film feeding mechanism 18 includes a mounting cylinder fixed to the frame 1, a mounting rod inserted into the mounting cylinder, and an elastic element 3 between the mounting rod and the bottom wall of the mounting cylinder. A roller is rotatably mounted on the extended end of the mounting rod, abutting against the packaging film 4. The multiple sets of rollers ensure that the packaging film 4 adheres to the rear wall of the feed tube 3, preventing loosening and guaranteeing a tight seal between the vertical edges of the packaging film 4 and the heat seal.

[0056] In the factory area, the packaging bags are initially in the form of a thin film, which is then rolled up. First, on the upper part of the feed tube 3, the vertical heat-sealing machine 8 guides the two vertical edges of the packaging film 4 to close, and then heat-seales it to form a second-stage cylindrical package. Then, a horizontal heat-sealing mechanism is used to horizontally heat-seal and cut the cylindrical package, sealing both ends to form a sealed packaging bag.

[0057] In this plan, refer to Appendix Figure 3 Appendix Figure 4 Appendix Figure 5 Appendix Figure 10 As shown, the vertical heat-sealing mechanism includes a film-guiding tube 6 fixed on the frame 1. The film-guiding tube 6 is sleeved on the material tube 3, and a gap is provided between the inner wall of the film-guiding tube 6 and the outer wall of the material tube 3, which serves as the conveying channel for the packaging film 4. The lower end of the film-guiding tube 6 is located above the belt 14, without contact, to prevent interference with the conveying of the packaging film 4. The side wall of the film-guiding tube 6 has a through-hole 9, located on the side opposite to the direction of the packaging film 4's introduction, i.e., the side opposite to the roll of the packaging film 4. Guide plates 10 are provided on both sides of the opening 9, and the two vertical edges of the packaging film 4 are bent and guided to extend from the opening 9, and are closed by the guide plates 10. Second supports 36 are fixed on both the left and right sides of the material tube 3 on the frame 1. Second telescopic rods 37 are fixed on the second supports 36, and vertical heat-sealing machines 8 are fixed to the extended ends of the second telescopic rods 37. Through the two sets of second telescopic rods 37, the two sets of vertical heat-sealing machines 8 are controlled to move closer to each other for heat sealing and to move further apart for standby. The guide plate 10 has a notch 38 for use with the vertical heat sealer 8. The notch 38 corresponds to the width of the vertical heat sealer 8. The guide plate 10 guides and clamps the vertical edges of the packaging film 4 to close them. The presence of the notch 38 allows the vertical heat sealer 8 to pass through the notch 38 and imprint itself onto the packaging film 4 for vertical edge closing and heat sealing. This prevents the ends of the vertical edges from coming loose, thus avoiding the vertical edges from spreading out during the closing and heat sealing process, which would affect the heat sealing effect.

[0058] Preferably, the spacing of the openings 9 increases slightly from the lower end face of the notch 38 to correspond to the twisting deformation of the vertical edge of the packaging film 4 after heat sealing, so that the heat-sealed part does not move downward without being squeezed or interfered with.

[0059] Preferred options are shown in the appendix. Figure 9 As shown in the right-hand diagram, the horizontal cross-section of the guide plate 10 gradually converges away from the feed pipe 3. The spacing between the horizontal ends of the guide plate 10 matches the thickness of the packaging film 4 after it is stacked, thus ensuring a tight fit between the vertical edges of the packaging film 4 and guaranteeing the airtightness of the heat-sealed vertical edges. Furthermore, a rubber pad is provided on the inner wall of the horizontal end of the guide plate 10. The elastic compression of the rubber pad makes the vertical edges of the packaging film 4 fit even tighter and the conveying more stable.

[0060] Preferred options are shown in the appendix. Figure 9 As shown, the opening 9 has a flared shape at the top and rounded corners. This facilitates the closing and guiding of the vertical edges of the packaging film 4, while preventing the edges from tearing the packaging film 4 and causing leakage.

[0061] Preferably, the upper end of the film-guiding tube 6 is provided with a shoulder 7 for spreading and guiding the packaging film 4. The shoulder 7 increases the contact area of ​​the packaging film 4 as it enters the film-guiding tube 6, preventing the packaging film 4 from becoming excessively wrinkled after entering the film-guiding tube 6, which would affect the aesthetics of the packaging.

[0062] Preferably, the film-drawing tube 6 has heat resistance and heat insulation properties. It can be coated with a heat-insulating coating or made of heat-insulating materials such as fiberglass, asbestos, and rock wool to prevent the film-drawing tube 6 from being heated by the vertical heat-sealing machine 8, which would cause the internal packaging film 4 to deform or be damaged.

[0063] In this plan, refer to Appendix Figure 4 Appendix Figure 13 Appendix Figure 14 As shown, the transverse heat sealing mechanism includes two guide cylinders 19 fixedly mounted on the frame 1. The two guide cylinders 19 are located below the belt 14 and are symmetrically arranged along the material pipe 3. Guide rods 20 are inserted and mounted through each of the two guide cylinders 19, and the two guide rods 20 are horizontally slidably installed back and forth within their respective guide cylinders 19. Two mounting brackets 21 are commonly fitted onto the ends of the two guide rods 20 near the material pipe 3. The two mounting brackets 21 are symmetrically arranged back and forth along the material pipe 3, and a transverse heat sealing machine 22 is fixed to one side of each mounting bracket 21. Both ends of the two mounting brackets 21 have insertion holes, through which the guide rods 20 pass. One mounting bracket 21 is fixedly connected to the guide rod 20 via a sleeve, while the other mounting bracket 21 is axially slidably engaged with the guide rod 20 via the insertion hole. In the attached diagram, the front mounting bracket 21 is fixedly connected to the guide rod 20, and the rear mounting bracket 21 is horizontally slidably engaged with the guide rod 20. Both ends of the two mounting brackets 21 are rotatably connected to connecting rods 24. The two connecting rods 24 on the same side of the two mounting brackets 21 are rotatably connected to sliders 25. Slider 25 is vertically slidably mounted on guide posts 26. Guide posts 26 are fixed on a third support, which is fixed on the frame 1. The ends of the two guide rods 20 away from the material pipe 3 are rotatably connected to rockers. The two rockers are rotatably connected to cranks (cam structure shown in the figure). The cranks are rotatably mounted on the frame 1, forming a crank-slider mechanism 23. A dual-output shaft geared motor is fixedly mounted on the frame 1. The two output shafts of the dual-output shaft geared motor are connected to rollers rotatably mounted on the frame 1 via belt drive or chain drive. Gears 17 mesh with the rotating shafts of the rollers and cranks.

[0064] Thus, the dual-output shaft geared motor synchronously drives the crank-slider mechanism 23 to rotate, which in turn drives the two guide rods 20 to reciprocate horizontally back and forth within the guide cylinder 19. When the two guide rods 20 move backward, the guide rods 20 drive the front mounting bracket 21 to move backward and closer to the material pipe 3. The front mounting bracket 21, through the connecting rod 24, pushes against the slider 25 and moves upward along the guide post 26, while the slider 25, through another connecting rod 24, pulls the rear mounting bracket 21 forward and closer to the material pipe 3. The two sets of horizontal heat sealers 22 approach each other to achieve horizontal heat sealing of the packaging bag port. When the two move forward, the guide rods 20, carrying the front mounting bracket 21, move forward and away from the material pipe 3. The front mounting bracket 21, through the connecting rod 24, pulls the slider 25 downward, while the slider 25, through another connecting rod 24, pushes against the rear mounting bracket 21 and moves backward and away from the material pipe 3. At this time, the two sets of horizontal heat sealers 22 separate and are in heat sealing standby state.

[0065] Preferred options are shown in the appendix. Figure 13 As shown, the crank (cam structure) has multiple connection points that cooperate with the rocker arm. These connection points are arranged in a straight line, meaning that the distance between the multiple connection points and the crank rotation center gradually increases. By adjusting different connection points between the crank and the rocker arm, the amplitude of the guide rod 20 being pulled back and forth by the crank slider mechanism 23 can be adjusted. This, in turn, adjusts the maximum distance between the two sets of horizontal heat sealing machines 22 in the standby position and the heat sealing position, adapting to different usage scenarios and improving the product's applicability to various scenarios.

[0066] To mitigate the impact of food falling onto the heat-sealed port of the packaging bag, in this design, guide shafts 28 are symmetrically fixed to the left and right sides of the material tube 3 below the guide rod 20 on the front side of the frame 1. Movable plates 27 are mounted on both guide shafts 28, and the movable plates 27 have the same structure as the mounting frame 21. The two movable plates 27 are horizontally slidably mounted on the guide shafts 28. A flared hopper 29 is fixed to the opposite side of each of the two movable plates 27. The hoppers 29 have different models, and the flaring angles differ between models to correspond to different sizes of packaging bags. The flaring angle is changed according to the size of the food packaging bag. The minimum diameter of the hopper 29 is located above the lower port of the formed packaging film 4. The formed packaging film 4 is the state after the packaging film 4 has undergone vertical edge closure heat sealing and lower port horizontal heat sealing.

[0067] During material feeding, the two sets of mounting brackets 21 are positioned far apart, causing the two sets of horizontal heat sealers 22 to separate and be in the heat sealing standby position. The two sets of moving plates 27 are brought close together, causing the minimum diameter of the support buckets 29 to abut against each other at the upper edge of the lower sealing opening of the formed packaging film 4. By using the clamping action of the support buckets 29 on the formed packaging film 4, the lower heat sealing opening of the packaging bag is isolated. As the food falls from the material tube 3, it can only impact the support buckets 29, thus avoiding the possibility of material stretching and deformation, misalignment of the sealing layer, or even local cracking at the sealing opening due to material impact, resulting in a "drop opening" phenomenon and the risk of air leakage, liquid seepage, or microbial contamination.

[0068] After the material is unloaded, the two sets of mounting frames 21 move closer together, allowing the two sets of transverse heat sealers to approach and heat seal the upper end of the formed packaging film 4, thus sealing and packaging the complete food. Meanwhile, the two moving plates 27 move away, causing the two trays 29 to separate, thereby not interfering with the falling and conveying of the packaged food.

[0069] To achieve the synchronized positional changes of the horizontal heat sealing machine 22 and the support bucket 29 during the aforementioned material feeding and unloading processes, this design incorporates trusses 30 symmetrically fixed on both sides of the material pipe 3 on the frame 1. Two pry bars 31 are symmetrically and rotatably mounted on each of the two trusses 30, with each pry bar 31 corresponding to one of the two mounting brackets 21 on the guide rod 20. Each pry bar 31 has a straight groove at both its upper and lower ends, into which a rod is inserted. The upper rod is fixedly connected to the mounting bracket 21, and the lower rod is fixedly connected to the moving plate 27. Thus, when the mounting bracket 21 is driven to move, the two sets of moving plates 27 are driven synchronously.

[0070] When the two mounting frames 21 approach each other, causing the two horizontal heat sealers 22 to approach each other for sealing operations, the upper ends of the two pry bars 31 on the same side are pulled closer to each other by the upper insertion rod, while the lower ends move away from each other, thereby separating the two sets of hoppers 29 and not interfering with the falling and conveying of the packaged food bags.

[0071] When the two mounting brackets 21 move away from each other, causing the two horizontal heat sealers 22 to move away from each other and be in the heat sealing standby position, the upper ends of the two pry bars 31 on the same side separate from each other and the lower ends move closer to each other, thereby causing the two sets of support buckets 29 to move closer to each other and provide impact protection for the material discharge.

[0072] In this design, both sets of horizontal heat sealing machines 22 are equipped with clamping plates 35 at their lower ends. Both clamping plates 35 are folded in half, with their bends corresponding to each other. When the two sets of horizontal heat sealing machines 22 approach each other for end heat sealing, the two clamping plates 35 are close together, and their bends abut against the lower part of the heat-sealed opening at the top of the packaging bag. This prevents the packaging bag from immediately falling after the heat seal is broken. After the two horizontal heat sealing machines 22 separate, the two clamping plates 35 no longer hold the packaging bag, at which point the bag falls. This brief suspension of the packaging bag in the air prolongs its fall time, allowing the heat seal to solidify better and preventing the food-containing packaging bag from falling directly and causing the freshly heat-sealed opening to burst open due to impact and pressure.

[0073] After the tray 29 separates, the packaging bag falls through the gap between the trays 29. To further mitigate the impact of the packaging bag upon landing, in this design, a guide hopper 33 is rotatably mounted on the frame 1 below the moving plate 27. The hopper is scoop-shaped. An elastic element 34 is provided between the guide hopper 33 and the frame 1. A pry bar 32 is rotatably mounted on the frame 1 between the two sets of moving plates 27. (Refer to the attached diagram.) Figure 14 Appendix Figure 17 As shown, in this design, an extension frame is fixed on the guide shaft 28, and a pry bar 32 is rotatably mounted on the extension frame. The lower end of the pry bar 32 abuts against the side of the guide hopper 33, and the upper end of the pry bar 32 extends above the moving plate 27.

[0074] When the two movable plates 27 approach each other, the hopper 29 lifts and clamps the packaging bag. The movable plates 27 press against the upper end of the pry bar 32, causing the pry bar 32 to rotate counterclockwise. This causes the pry bar 32 to sink against the end of the guide hopper 33, creating enough space between the guide hoppers 33 so that the lower end of the packaging bag can extend downwards and hang down.

[0075] When the two movable plates 27 move away from each other, the movable plates 27 separate from the pry bar 32, and the guide hopper 33 tilts up under the upward action of the elastic element 34, so that the guide hopper 33 is as close as possible to the packaging bag, reducing the falling height of the packaging bag, thereby slowing down the impact of the falling packaging bag and reducing the probability of the seal breaking open.

[0076] The specific implementation process of this plan:

[0077] The packaging film 4 is pulled to the film guide tube 6, and the two vertical edges of the packaging film 4 are gathered together and extended from the opening 9 and clamped between the guide plates 10 to form a closed state. The closed packaging film 4 is clamped by two sets of close vertical heat sealers 8 to achieve heat sealing. After heat sealing is completed, the two sets of vertical heat sealers 8 separate and go to the standby position. The cylindrical packaging bag with the vertical edges closed and sealed continues to be pulled down by the belt 14.

[0078] When the cylindrical packaging bag moves to the horizontal heat sealing machine 22, the two sets of horizontal heat sealing machines 22 approach each other to achieve heat sealing of the lower end, thus sealing the first end. After heat sealing is completed, the two sets of horizontal heat sealing machines 22 separate to the standby position, and the packaging bag with the lower end sealed is pulled to continue moving downward to the designated position. At this time, the two trays 29 are driven by the pry bar 31 to approach each other and then abut against the upper part of the lower seal of the packaging bag. Then, the food is injected into the packaging bag from the feed pipe 3. The food impacts the trays 29, thereby isolating the impact on the sealing of the packaging bag and reducing the probability of the seal breaking open. At this time, the moving plate 27 abuts against the upper end of the pry bar 32, causing the pry bar 32 to sink against the end of the guide hopper 33, so that there is enough space between the guide hoppers 33 to allow the lower end of the packaging bag to extend and hang down.

[0079] After the food is fed, the two horizontal heat sealers 22 approach each other to perform heat sealing at the top, while the two hoppers 29 separate without interfering with the falling of the packaging bag. The heat-sealed packaging bag is temporarily held in place by the clamping plate 35, thus extending the time the bag spends falling to the ground and allowing the heat seal to solidify better. When the two hoppers 29 separate, the guide hopper 33 tilts upwards under the upward force of the elastic element 34, bringing the guide hopper 33 as close as possible to the packaging bag, reducing the bag's falling height, and thus mitigating the impact of the falling bag and reducing the probability of the seal breaking open.

[0080] In this design, as soon as the two horizontal heat sealers 22 separate and the packaging begins to descend, the distance between the two trays 29 is sufficient for the packaging bag to pass through. Even when the two trays 29 move to the middle of their travel, the packaging bag can still slide down.

[0081] In Example 2, to achieve heat-sealing and disconnection of the packaging bag at the top port, multiple heat-insulating pads are fixed on opposite sides of both sets of mounting brackets 21. Heat-insulating knife holders 2201 are fixedly mounted on the multiple pads of the same mounting bracket 21. Each of the two knife holders 2201 has a groove on opposite sides. A fixed heat-sealing knife 2202 is fixed in one groove, and a movable heat-sealing knife 2203 is slidably mounted in the other groove. The movable heat-sealing knife 2203 is aligned with the fixed heat-sealing knife 2202 for use. The movable heat-sealing knife 2203 will not fall out of the groove when not disassembled. An elastic element 2204 is provided between the movable heat-sealing knife 2203 and the corresponding groove. The elastic element 2204 has good heat resistance to prevent heat from affecting its elasticity. The movable heat-sealing knife 2203 has a through hole at its horizontal center. A cutting knife 2205 is fixed in the groove of the corresponding knife holder 2201. The cutting knife 2205 passes through the through hole, while the end face of the fixed heat-sealing knife 2202 has a relief groove 2206 corresponding to the cutting knife 2205. The length of the cutting knife 2205 is less than the sum of the naturally extended length of the elastic element 2204 and the thickness of the movable heat-sealing knife 2203, and the length of the cutting knife 2205 is greater than the groove depth.

[0082] Based on the above technical solution:

[0083] When the two sets of mounting brackets 21 approach each other, the movable heat sealing blade 2203 and the fixed heat sealing blade 2202 first contact the two sides of the packaging bag and abut against each other; under suitable temperature and heat sealing pressure, the port of the packaging bag melts and seals (under this pressure, the elastic element 2204 contracts, but the cutting blade 2205 does not extend from the perforation). Then the two sets of horizontal heat sealing machines 22 continue to approach each other and apply pressure, the elastic element 2204 continues to be compressed, at which point the cutting blade 2205 extends from the perforation into the relief groove 2206, thereby making a horizontal cut on the sealed part to separate the lower packaging bag from the upper packaging bag.

[0084] After heat sealing is completed, the two horizontal heat sealers gradually separate. At this time, the package falls onto the guide hopper 33 and is guided by the guide hopper 33 into a conveying mechanism such as a conveyor belt.

[0085] Preferably, a limiting block is provided in the groove of the tool holder 2201 corresponding to the movable heat sealing knife 2203 to prevent the movable heat sealing knife 2203 from being completely retracted into the groove.

[0086] In this scheme, the first telescopic rod 12 and the second telescopic rod 37 can be any one of electric telescopic rod, pneumatic telescopic rod, or hydraulic telescopic rod.

[0087] In this design, elastic component 1 (2204), elastic component 2 (34), and the elastic component itself are all springs. The springs are made of high-temperature resistant materials, such as high-temperature alloys like CrV, CrSi, and Inconel.

[0088] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0089] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0090] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A sealing machine for food packaging comprising a frame (1), a tube (3), characterized in that, The rack (1) is provided with a vertical heat sealing mechanism for sealing the vertical edge of the packaging film (4) and a horizontal heat sealing mechanism for sealing the end of the packaging film (4). The horizontal heat sealing mechanism comprises two groups of horizontal heat sealing machines (22) which are driven by a driving mechanism to move synchronously in opposite directions, and a crowbar (31) is rotatably installed below both ends of the two groups of horizontal heat sealing machines (22) on the rack (1), the two ends of the crowbar (31) are provided with straight grooves, and a plug rod is embedded in each straight groove, the plug rod in the upper straight groove is fixedly connected with the horizontal heat sealing machine (22), and the plug rod in the lower straight groove is fixedly connected with a horizontally movable moving plate (27), the two moving plates (27) are provided with flared holding buckets (29) on one side, and the smallest diameter of the holding bucket (29) is located above the lower end of the formed packaging film (4). The vertical heat sealing mechanism comprises a film guide pipe (6) fixed on the rack (1), the film guide pipe (6) is sleeved on the material pipe (3), and the inner wall of the film guide pipe (6) is arranged in a gap with the outer wall of the material pipe (3), the film guide pipe (6) is provided with an opening (9) on the side away from the direction of the packaging film (4) introduction, the two sides of the opening (9) are provided with film guide plates (10) for folding the vertical edge of the packaging film (4), and the rack (1) is provided with vertically movable vertical heat sealing machines (8) on both sides of the opening (9). The horizontal heat sealing machine (22) comprises symmetrically arranged mounting racks (21), the upper plug rod is fixed to the end of the mounting rack (21), and the two groups of mounting racks (21) are provided with heat-insulated knife holders (2201) on one side; the two knife holders (2201) are provided with embedding grooves on one side, one embedding groove is fixedly provided with a fixed heat sealing knife (2202), the other embedding groove is slidably provided with a movable heat sealing knife (2203) matched with the fixed heat sealing knife (2202), an elastic member (2204) is arranged between the movable heat sealing knife (2203) and the corresponding embedding groove, the end face of the fixed heat sealing knife (2202) is provided with a recess (2206), and the corresponding embedding groove of the movable heat sealing knife (2203) is fixedly provided with a cutting knife (2205) penetrating through the movable heat sealing knife (2203). A material guide hopper (33) is rotatably installed below the moving plate (27) on the rack (1), an elastic member (34) is arranged between the material guide hopper (33) and the rack (1), a crowbar (32) is rotatably installed between the two groups of moving plates (27) on the rack (1), the lower end of the crowbar (32) abuts against the side of the material guide hopper (33), and the upper end of the crowbar (32) extends above the moving plate (27). The lower end of each of the two groups of horizontal heat sealing machines (22) is provided with a clamping plate (35), and the two clamping plates (35) are folded in half.

2. A machine for sealing food packaging according to claim 1, characterized in that The horizontal cross section of the film guide plate (10) gradually converges in the direction away from the material pipe (3).

3. The machine according to claim 1, characterized in that, The opening (9) is flared above.

4. The machine according to claim 1, characterized in that, The driving mechanism comprises two groups of guide rods (20) horizontally slidingly installed on the frame (1), the two groups of guide rods (20) are respectively located on the two sides of the mounting frame (21), the two ends of the two mounting frames (21) are respectively slidingly connected with the corresponding side guide rods (20), the guide rods (20) are driven by the motor fixed on the frame (1) through the crank slider mechanism (23), the slider (25) is vertically slidingly installed on the frame (1) at the middle line of the two groups of horizontal heat sealing machines (22), the two connecting rods (24) are rotatably installed on the slider (25), and the two connecting rods (24) are respectively rotatably connected with the end portions of the two groups of mounting frames (21).

5. The food packaging sealing machine according to claim 1, characterized in that, The film guide pipe (6) is provided with a shoulder (7) for spreading and guiding the packaging film (4) at the upper end.

6. The food packaging sealer of claim 1, wherein The film feeding mechanism for downwardly conveying the packaging film (4) is further included.

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